Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ...
author: Linus Torvalds <torvalds@linux-foundation.org> 2026-08-23 13:28:57 -0700
committer: Linus Torvalds <torvalds@linux-foundation.org> 2026-08-23 13:28:57 -0700
commit: 4352b8aee98005853aa63f57d6377282de17a33f (patch)
tree: 27614d7a9ef05c32d089004e104364ce42324837 /sound/aoa
download: linux-stable-4352b8aee98005853aa63f57d6377282de17a33f.tar.gz
linux-stable-4352b8aee98005853aa63f57d6377282de17a33f.zip
33 files changed, 7446 insertions, 0 deletions
diff --git a/sound/aoa/Kconfig b/sound/aoa/Kconfig
new file mode 100644
index 000000000..c58308ae4
--- /dev/null
+++ b/sound/aoa/Kconfig
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig SND_AOA
+	tristate "Apple Onboard Audio driver"
+	depends on PPC_PMAC
+	select SND_PCM
+	help
+	This option enables the new driver for the various
+	Apple Onboard Audio components.
+
+if SND_AOA
+
+source "sound/aoa/fabrics/Kconfig"
+
+source "sound/aoa/codecs/Kconfig"
+
+source "sound/aoa/soundbus/Kconfig"
+
+endif	# SND_AOA
diff --git a/sound/aoa/Makefile b/sound/aoa/Makefile
new file mode 100644
index 000000000..8dbfb01ba
--- /dev/null
+++ b/sound/aoa/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SND_AOA) += core/
+obj-$(CONFIG_SND_AOA_SOUNDBUS) += soundbus/
+obj-$(CONFIG_SND_AOA) += fabrics/
+obj-$(CONFIG_SND_AOA) += codecs/
diff --git a/sound/aoa/aoa-gpio.h b/sound/aoa/aoa-gpio.h
new file mode 100644
index 000000000..77ae75d75
--- /dev/null
+++ b/sound/aoa/aoa-gpio.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple Onboard Audio GPIO definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#ifndef __AOA_GPIO_H
+#define __AOA_GPIO_H
+#include <linux/workqueue.h>
+#include <linux/mutex.h>
+
+typedef void (*notify_func_t)(void *data);
+
+enum notify_type {
+	AOA_NOTIFY_HEADPHONE,
+	AOA_NOTIFY_LINE_IN,
+	AOA_NOTIFY_LINE_OUT,
+};
+
+struct gpio_runtime;
+struct gpio_methods {
+	/* for initialisation/de-initialisation of the GPIO layer */
+	void (*init)(struct gpio_runtime *rt);
+	void (*exit)(struct gpio_runtime *rt);
+
+	/* turn off headphone, speakers, lineout */
+	void (*all_amps_off)(struct gpio_runtime *rt);
+	/* turn headphone, speakers, lineout back to previous setting */
+	void (*all_amps_restore)(struct gpio_runtime *rt);
+
+	void (*set_headphone)(struct gpio_runtime *rt, int on);
+	void (*set_speakers)(struct gpio_runtime *rt, int on);
+	void (*set_lineout)(struct gpio_runtime *rt, int on);
+	void (*set_master)(struct gpio_runtime *rt, int on);
+
+	int (*get_headphone)(struct gpio_runtime *rt);
+	int (*get_speakers)(struct gpio_runtime *rt);
+	int (*get_lineout)(struct gpio_runtime *rt);
+	int (*get_master)(struct gpio_runtime *rt);
+
+	void (*set_hw_reset)(struct gpio_runtime *rt, int on);
+
+	/* use this to be notified of any events. The notification
+	 * function is passed the data, and is called in process
+	 * context by the use of schedule_work.
+	 * The interface for it is that setting a function to NULL
+	 * removes it, and they return 0 if the operation succeeded,
+	 * and -EBUSY if the notification is already assigned by
+	 * someone else. */
+	int (*set_notify)(struct gpio_runtime *rt,
+			  enum notify_type type,
+			  notify_func_t notify,
+			  void *data);
+	/* returns 0 if not plugged in, 1 if plugged in
+	 * or a negative error code */
+	int (*get_detect)(struct gpio_runtime *rt,
+			  enum notify_type type);
+};
+
+struct gpio_notification {
+	struct delayed_work work;
+	notify_func_t notify;
+	void *data;
+	void *gpio_private;
+	struct mutex mutex;
+};
+
+struct gpio_runtime {
+	/* to be assigned by fabric */
+	struct device_node *node;
+	/* since everyone needs this pointer anyway... */
+	struct gpio_methods *methods;
+	/* to be used by the gpio implementation */
+	int implementation_private;
+	struct gpio_notification headphone_notify;
+	struct gpio_notification line_in_notify;
+	struct gpio_notification line_out_notify;
+};
+
+#endif /* __AOA_GPIO_H */
diff --git a/sound/aoa/aoa.h b/sound/aoa/aoa.h
new file mode 100644
index 000000000..b92593f17
--- /dev/null
+++ b/sound/aoa/aoa.h
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple Onboard Audio definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#ifndef __AOA_H
+#define __AOA_H
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/asound.h>
+#include <sound/control.h>
+#include "aoa-gpio.h"
+#include "soundbus/soundbus.h"
+
+#define MAX_CODEC_NAME_LEN	32
+
+struct aoa_codec {
+	char	name[MAX_CODEC_NAME_LEN];
+
+	struct module *owner;
+
+	/* called when the fabric wants to init this codec.
+	 * Do alsa card manipulations from here. */
+	int (*init)(struct aoa_codec *codec);
+
+	/* called when the fabric is done with the codec.
+	 * The alsa card will be cleaned up so don't bother. */
+	void (*exit)(struct aoa_codec *codec);
+
+	/* May be NULL, but can be used by the fabric.
+	 * Refcounting is the codec driver's responsibility */
+	struct device_node *node;
+
+	/* assigned by fabric before init() is called, points
+	 * to the soundbus device. Cannot be NULL. */
+	struct soundbus_dev *soundbus_dev;
+
+	/* assigned by the fabric before init() is called, points
+	 * to the fabric's gpio runtime record for the relevant
+	 * device. */
+	struct gpio_runtime *gpio;
+
+	/* assigned by the fabric before init() is called, contains
+	 * a codec specific bitmask of what outputs and inputs are
+	 * actually connected */
+	u32 connected;
+
+	/* data the fabric can associate with this structure */
+	const void *fabric_data;
+
+	/* private! */
+	struct list_head list;
+	struct aoa_fabric *fabric;
+};
+
+/* return 0 on success */
+extern int
+aoa_codec_register(struct aoa_codec *codec);
+extern void
+aoa_codec_unregister(struct aoa_codec *codec);
+
+#define MAX_LAYOUT_NAME_LEN	32
+
+struct aoa_fabric {
+	char	name[MAX_LAYOUT_NAME_LEN];
+
+	struct module *owner;
+
+	/* once codecs register, they are passed here after.
+	 * They are of course not initialised, since the
+	 * fabric is responsible for initialising some fields
+	 * in the codec structure! */
+	int (*found_codec)(struct aoa_codec *codec);
+	/* called for each codec when it is removed,
+	 * also in the case that aoa_fabric_unregister
+	 * is called and all codecs are removed
+	 * from this fabric.
+	 * Also called if found_codec returned 0 but
+	 * the codec couldn't initialise. */
+	void (*remove_codec)(struct aoa_codec *codec);
+	/* If found_codec returned 0, and the codec
+	 * could be initialised, this is called. */
+	void (*attached_codec)(struct aoa_codec *codec);
+};
+
+/* return 0 on success, -EEXIST if another fabric is
+ * registered, -EALREADY if the same fabric is registered.
+ * Passing NULL can be used to test for the presence
+ * of another fabric, if -EALREADY is returned there is
+ * no other fabric present.
+ * In the case that the function returns -EALREADY
+ * and the fabric passed is not NULL, all codecs
+ * that are not assigned yet are passed to the fabric
+ * again for reconsideration. */
+extern int
+aoa_fabric_register(struct aoa_fabric *fabric, struct device *dev);
+
+/* it is vital to call this when the fabric exits!
+ * When calling, the remove_codec will be called
+ * for all codecs, unless it is NULL. */
+extern void
+aoa_fabric_unregister(struct aoa_fabric *fabric);
+
+/* if for some reason you want to get rid of a codec
+ * before the fabric is removed, use this.
+ * Note that remove_codec is called for it! */
+extern void
+aoa_fabric_unlink_codec(struct aoa_codec *codec);
+
+/* alsa help methods */
+struct aoa_card {
+	struct snd_card *alsa_card;
+};
+        
+extern int aoa_snd_device_new(enum snd_device_type type,
+	void *device_data, const struct snd_device_ops *ops);
+extern struct snd_card *aoa_get_card(void);
+extern int aoa_snd_ctl_add(struct snd_kcontrol* control);
+
+/* GPIO stuff */
+extern struct gpio_methods *pmf_gpio_methods;
+extern struct gpio_methods *ftr_gpio_methods;
+/* extern struct gpio_methods *map_gpio_methods; */
+
+#endif /* __AOA_H */
diff --git a/sound/aoa/codecs/Kconfig b/sound/aoa/codecs/Kconfig
new file mode 100644
index 000000000..03f89dbcc
--- /dev/null
+++ b/sound/aoa/codecs/Kconfig
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SND_AOA_ONYX
+	tristate "support Onyx chip"
+	select I2C
+	select I2C_POWERMAC
+	help
+	This option enables support for the Onyx (pcm3052)
+	codec chip found in the latest Apple machines
+	(most of those with digital audio output).
+
+config SND_AOA_TAS
+	tristate "support TAS chips"
+	select I2C
+	select I2C_POWERMAC
+	help
+	This option enables support for the tas chips
+	found in a lot of Apple Machines, especially
+	iBooks and PowerBooks without digital.
+
+config SND_AOA_TOONIE
+	tristate "support Toonie chip"
+	help
+	This option enables support for the toonie codec
+	found in the Mac Mini. If you have a Mac Mini and
+	want to hear sound, select this option.
diff --git a/sound/aoa/codecs/Makefile b/sound/aoa/codecs/Makefile
new file mode 100644
index 000000000..8feedc771
--- /dev/null
+++ b/sound/aoa/codecs/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+snd-aoa-codec-onyx-y := onyx.o
+snd-aoa-codec-tas-y := tas.o
+snd-aoa-codec-toonie-y := toonie.o
+
+obj-$(CONFIG_SND_AOA_ONYX) += snd-aoa-codec-onyx.o
+obj-$(CONFIG_SND_AOA_TAS) += snd-aoa-codec-tas.o
+obj-$(CONFIG_SND_AOA_TOONIE) += snd-aoa-codec-toonie.o
diff --git a/sound/aoa/codecs/onyx.c b/sound/aoa/codecs/onyx.c
new file mode 100644
index 000000000..4fb593e88
--- /dev/null
+++ b/sound/aoa/codecs/onyx.c
@@ -0,0 +1,1048 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio driver for Onyx codec
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This is a driver for the pcm3052 codec chip (codenamed Onyx)
+ * that is present in newer Apple hardware (with digital output).
+ *
+ * The Onyx codec has the following connections (listed by the bit
+ * to be used in aoa_codec.connected):
+ *  0: analog output
+ *  1: digital output
+ *  2: line input
+ *  3: microphone input
+ * Note that even though I know of no machine that has for example
+ * the digital output connected but not the analog, I have handled
+ * all the different cases in the code so that this driver may serve
+ * as a good example of what to do.
+ *
+ * NOTE: This driver assumes that there's at most one chip to be
+ * 	 used with one alsa card, in form of creating all kinds
+ *	 of mixer elements without regard for their existence.
+ *	 But snd-aoa assumes that there's at most one card, so
+ *	 this means you can only have one onyx on a system. This
+ *	 should probably be fixed by changing the assumption of
+ *	 having just a single card on a system, and making the
+ *	 'card' pointer accessible to anyone who needs it instead
+ *	 of hiding it in the aoa_snd_* functions...
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <sound/asoundef.h>
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("pcm3052 (onyx) codec driver for snd-aoa");
+
+#include "onyx.h"
+#include "../aoa.h"
+#include "../soundbus/soundbus.h"
+
+
+#define PFX "snd-aoa-codec-onyx: "
+
+struct onyx {
+	/* cache registers 65 to 80, they are write-only! */
+	u8			cache[16];
+	struct i2c_client	*i2c;
+	struct aoa_codec	codec;
+	u32			initialised:1,
+				spdif_locked:1,
+				analog_locked:1,
+				original_mute:2;
+	int			open_count;
+	struct codec_info	*codec_info;
+
+	/* mutex serializes concurrent access to the device
+	 * and this structure.
+	 */
+	struct mutex mutex;
+};
+#define codec_to_onyx(c) container_of(c, struct onyx, codec)
+
+/* both return 0 if all ok, else on error */
+static int onyx_read_register(struct onyx *onyx, u8 reg, u8 *value)
+{
+	s32 v;
+
+	if (reg != ONYX_REG_CONTROL) {
+		*value = onyx->cache[reg-FIRSTREGISTER];
+		return 0;
+	}
+	v = i2c_smbus_read_byte_data(onyx->i2c, reg);
+	if (v < 0) {
+		*value = 0;
+		return -1;
+	}
+	*value = (u8)v;
+	onyx->cache[ONYX_REG_CONTROL-FIRSTREGISTER] = *value;
+	return 0;
+}
+
+static int onyx_write_register(struct onyx *onyx, u8 reg, u8 value)
+{
+	int result;
+
+	result = i2c_smbus_write_byte_data(onyx->i2c, reg, value);
+	if (!result)
+		onyx->cache[reg-FIRSTREGISTER] = value;
+	return result;
+}
+
+/* alsa stuff */
+
+static int onyx_dev_register(struct snd_device *dev)
+{
+	return 0;
+}
+
+static const struct snd_device_ops ops = {
+	.dev_register = onyx_dev_register,
+};
+
+/* this is necessary because most alsa mixer programs
+ * can't properly handle the negative range */
+#define VOLUME_RANGE_SHIFT	128
+
+static int onyx_snd_vol_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = -128 + VOLUME_RANGE_SHIFT;
+	uinfo->value.integer.max = -1 + VOLUME_RANGE_SHIFT;
+	return 0;
+}
+
+static int onyx_snd_vol_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	s8 l, r;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
+	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);
+
+	ucontrol->value.integer.value[0] = l + VOLUME_RANGE_SHIFT;
+	ucontrol->value.integer.value[1] = r + VOLUME_RANGE_SHIFT;
+
+	return 0;
+}
+
+static int onyx_snd_vol_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	s8 l, r;
+
+	if (ucontrol->value.integer.value[0] < -128 + VOLUME_RANGE_SHIFT ||
+	    ucontrol->value.integer.value[0] > -1 + VOLUME_RANGE_SHIFT)
+		return -EINVAL;
+	if (ucontrol->value.integer.value[1] < -128 + VOLUME_RANGE_SHIFT ||
+	    ucontrol->value.integer.value[1] > -1 + VOLUME_RANGE_SHIFT)
+		return -EINVAL;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
+	onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);
+
+	if (l + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[0] &&
+	    r + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[1])
+		return 0;
+
+	onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_LEFT,
+			    ucontrol->value.integer.value[0]
+			     - VOLUME_RANGE_SHIFT);
+	onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT,
+			    ucontrol->value.integer.value[1]
+			     - VOLUME_RANGE_SHIFT);
+
+	return 1;
+}
+
+static const struct snd_kcontrol_new volume_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Playback Volume",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = onyx_snd_vol_info,
+	.get = onyx_snd_vol_get,
+	.put = onyx_snd_vol_put,
+};
+
+/* like above, this is necessary because a lot
+ * of alsa mixer programs don't handle ranges
+ * that don't start at 0 properly.
+ * even alsamixer is one of them... */
+#define INPUTGAIN_RANGE_SHIFT	(-3)
+
+static int onyx_snd_inputgain_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 3 + INPUTGAIN_RANGE_SHIFT;
+	uinfo->value.integer.max = 28 + INPUTGAIN_RANGE_SHIFT;
+	return 0;
+}
+
+static int onyx_snd_inputgain_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 ig;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &ig);
+
+	ucontrol->value.integer.value[0] =
+		(ig & ONYX_ADC_PGA_GAIN_MASK) + INPUTGAIN_RANGE_SHIFT;
+
+	return 0;
+}
+
+static int onyx_snd_inputgain_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 v, n;
+
+	if (ucontrol->value.integer.value[0] < 3 + INPUTGAIN_RANGE_SHIFT ||
+	    ucontrol->value.integer.value[0] > 28 + INPUTGAIN_RANGE_SHIFT)
+		return -EINVAL;
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+	n = v;
+	n &= ~ONYX_ADC_PGA_GAIN_MASK;
+	n |= (ucontrol->value.integer.value[0] - INPUTGAIN_RANGE_SHIFT)
+		& ONYX_ADC_PGA_GAIN_MASK;
+	onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, n);
+
+	return n != v;
+}
+
+static const struct snd_kcontrol_new inputgain_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Capture Volume",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = onyx_snd_inputgain_info,
+	.get = onyx_snd_inputgain_get,
+	.put = onyx_snd_inputgain_put,
+};
+
+static int onyx_snd_capture_source_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	static const char * const texts[] = { "Line-In", "Microphone" };
+
+	return snd_ctl_enum_info(uinfo, 1, 2, texts);
+}
+
+static int onyx_snd_capture_source_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	s8 v;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+
+	ucontrol->value.enumerated.item[0] = !!(v&ONYX_ADC_INPUT_MIC);
+
+	return 0;
+}
+
+static void onyx_set_capture_source(struct onyx *onyx, int mic)
+{
+	s8 v;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+	v &= ~ONYX_ADC_INPUT_MIC;
+	if (mic)
+		v |= ONYX_ADC_INPUT_MIC;
+	onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, v);
+}
+
+static int onyx_snd_capture_source_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	if (ucontrol->value.enumerated.item[0] > 1)
+		return -EINVAL;
+	onyx_set_capture_source(snd_kcontrol_chip(kcontrol),
+				ucontrol->value.enumerated.item[0]);
+	return 1;
+}
+
+static const struct snd_kcontrol_new capture_source_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	/* If we name this 'Input Source', it properly shows up in
+	 * alsamixer as a selection, * but it's shown under the
+	 * 'Playback' category.
+	 * If I name it 'Capture Source', it shows up in strange
+	 * ways (two bools of which one can be selected at a
+	 * time) but at least it's shown in the 'Capture'
+	 * category.
+	 * I was told that this was due to backward compatibility,
+	 * but I don't understand then why the mangling is *not*
+	 * done when I name it "Input Source".....
+	 */
+	.name = "Capture Source",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = onyx_snd_capture_source_info,
+	.get = onyx_snd_capture_source_get,
+	.put = onyx_snd_capture_source_put,
+};
+
+#define onyx_snd_mute_info	snd_ctl_boolean_stereo_info
+
+static int onyx_snd_mute_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 c;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &c);
+
+	ucontrol->value.integer.value[0] = !(c & ONYX_MUTE_LEFT);
+	ucontrol->value.integer.value[1] = !(c & ONYX_MUTE_RIGHT);
+
+	return 0;
+}
+
+static int onyx_snd_mute_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 v = 0, c = 0;
+	int err = -EBUSY;
+
+	guard(mutex)(&onyx->mutex);
+	if (onyx->analog_locked)
+		return -EBUSY;
+
+	onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+	c = v;
+	c &= ~(ONYX_MUTE_RIGHT | ONYX_MUTE_LEFT);
+	if (!ucontrol->value.integer.value[0])
+		c |= ONYX_MUTE_LEFT;
+	if (!ucontrol->value.integer.value[1])
+		c |= ONYX_MUTE_RIGHT;
+	err = onyx_write_register(onyx, ONYX_REG_DAC_CONTROL, c);
+
+	return !err ? (v != c) : err;
+}
+
+static const struct snd_kcontrol_new mute_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Playback Switch",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = onyx_snd_mute_info,
+	.get = onyx_snd_mute_get,
+	.put = onyx_snd_mute_put,
+};
+
+
+#define onyx_snd_single_bit_info	snd_ctl_boolean_mono_info
+
+#define FLAG_POLARITY_INVERT	1
+#define FLAG_SPDIFLOCK		2
+
+static int onyx_snd_single_bit_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 c;
+	long int pv = kcontrol->private_value;
+	u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
+	u8 address = (pv >> 8) & 0xff;
+	u8 mask = pv & 0xff;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, address, &c);
+
+	ucontrol->value.integer.value[0] = !!(c & mask) ^ polarity;
+
+	return 0;
+}
+
+static int onyx_snd_single_bit_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 v = 0, c = 0;
+	int err;
+	long int pv = kcontrol->private_value;
+	u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
+	u8 spdiflock = (pv >> 16) & FLAG_SPDIFLOCK;
+	u8 address = (pv >> 8) & 0xff;
+	u8 mask = pv & 0xff;
+
+	guard(mutex)(&onyx->mutex);
+	if (spdiflock && onyx->spdif_locked) {
+		/* even if alsamixer doesn't care.. */
+		return -EBUSY;
+	}
+	onyx_read_register(onyx, address, &v);
+	c = v;
+	c &= ~(mask);
+	if (!!ucontrol->value.integer.value[0] ^ polarity)
+		c |= mask;
+	err = onyx_write_register(onyx, address, c);
+
+	return !err ? (v != c) : err;
+}
+
+#define SINGLE_BIT(n, type, description, address, mask, flags)	 	\
+static const struct snd_kcontrol_new n##_control = {			\
+	.iface = SNDRV_CTL_ELEM_IFACE_##type,				\
+	.name = description,						\
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,			\
+	.info = onyx_snd_single_bit_info,				\
+	.get = onyx_snd_single_bit_get,					\
+	.put = onyx_snd_single_bit_put,					\
+	.private_value = (flags << 16) | (address << 8) | mask		\
+}
+
+SINGLE_BIT(spdif,
+	   MIXER,
+	   SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
+	   ONYX_REG_DIG_INFO4,
+	   ONYX_SPDIF_ENABLE,
+	   FLAG_SPDIFLOCK);
+SINGLE_BIT(ovr1,
+	   MIXER,
+	   "Oversampling Rate",
+	   ONYX_REG_DAC_CONTROL,
+	   ONYX_OVR1,
+	   0);
+SINGLE_BIT(flt0,
+	   MIXER,
+	   "Fast Digital Filter Rolloff",
+	   ONYX_REG_DAC_FILTER,
+	   ONYX_ROLLOFF_FAST,
+	   FLAG_POLARITY_INVERT);
+SINGLE_BIT(hpf,
+	   MIXER,
+	   "Highpass Filter",
+	   ONYX_REG_ADC_HPF_BYPASS,
+	   ONYX_HPF_DISABLE,
+	   FLAG_POLARITY_INVERT);
+SINGLE_BIT(dm12,
+	   MIXER,
+	   "Digital De-Emphasis",
+	   ONYX_REG_DAC_DEEMPH,
+	   ONYX_DIGDEEMPH_CTRL,
+	   0);
+
+static int onyx_spdif_info(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	uinfo->count = 1;
+	return 0;
+}
+
+static int onyx_spdif_mask_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	/* datasheet page 30, all others are 0 */
+	ucontrol->value.iec958.status[0] = 0x3e;
+	ucontrol->value.iec958.status[1] = 0xff;
+
+	ucontrol->value.iec958.status[3] = 0x3f;
+	ucontrol->value.iec958.status[4] = 0x0f;
+
+	return 0;
+}
+
+static const struct snd_kcontrol_new onyx_spdif_mask = {
+	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
+	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
+	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,CON_MASK),
+	.info =		onyx_spdif_info,
+	.get =		onyx_spdif_mask_get,
+};
+
+static int onyx_spdif_get(struct snd_kcontrol *kcontrol,
+			  struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 v;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
+	ucontrol->value.iec958.status[0] = v & 0x3e;
+
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO2, &v);
+	ucontrol->value.iec958.status[1] = v;
+
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
+	ucontrol->value.iec958.status[3] = v & 0x3f;
+
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+	ucontrol->value.iec958.status[4] = v & 0x0f;
+
+	return 0;
+}
+
+static int onyx_spdif_put(struct snd_kcontrol *kcontrol,
+			  struct snd_ctl_elem_value *ucontrol)
+{
+	struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+	u8 v;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
+	v = (v & ~0x3e) | (ucontrol->value.iec958.status[0] & 0x3e);
+	onyx_write_register(onyx, ONYX_REG_DIG_INFO1, v);
+
+	v = ucontrol->value.iec958.status[1];
+	onyx_write_register(onyx, ONYX_REG_DIG_INFO2, v);
+
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
+	v = (v & ~0x3f) | (ucontrol->value.iec958.status[3] & 0x3f);
+	onyx_write_register(onyx, ONYX_REG_DIG_INFO3, v);
+
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+	v = (v & ~0x0f) | (ucontrol->value.iec958.status[4] & 0x0f);
+	onyx_write_register(onyx, ONYX_REG_DIG_INFO4, v);
+
+	return 1;
+}
+
+static int onyx_set_spdif_pcm_rate(struct onyx *onyx, unsigned int rate)
+{
+	u8 dig_info3, fs;
+
+	switch (rate) {
+	case 32000:
+		fs = IEC958_AES3_CON_FS_32000;
+		break;
+	case 44100:
+		fs = IEC958_AES3_CON_FS_44100;
+		break;
+	case 48000:
+		fs = IEC958_AES3_CON_FS_48000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &dig_info3))
+		return -EBUSY;
+	dig_info3 = (dig_info3 & ~IEC958_AES3_CON_FS) | fs;
+	if (onyx_write_register(onyx, ONYX_REG_DIG_INFO3, dig_info3))
+		return -EBUSY;
+
+	return 0;
+}
+
+static const struct snd_kcontrol_new onyx_spdif_ctrl = {
+	.access =	SNDRV_CTL_ELEM_ACCESS_READWRITE |
+			SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
+	.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
+	.info =		onyx_spdif_info,
+	.get =		onyx_spdif_get,
+	.put =		onyx_spdif_put,
+};
+
+/* our registers */
+
+static const u8 register_map[] = {
+	ONYX_REG_DAC_ATTEN_LEFT,
+	ONYX_REG_DAC_ATTEN_RIGHT,
+	ONYX_REG_CONTROL,
+	ONYX_REG_DAC_CONTROL,
+	ONYX_REG_DAC_DEEMPH,
+	ONYX_REG_DAC_FILTER,
+	ONYX_REG_DAC_OUTPHASE,
+	ONYX_REG_ADC_CONTROL,
+	ONYX_REG_ADC_HPF_BYPASS,
+	ONYX_REG_DIG_INFO1,
+	ONYX_REG_DIG_INFO2,
+	ONYX_REG_DIG_INFO3,
+	ONYX_REG_DIG_INFO4
+};
+
+static const u8 initial_values[ARRAY_SIZE(register_map)] = {
+	0x80, 0x80, /* muted */
+	ONYX_MRST | ONYX_SRST, /* but handled specially! */
+	ONYX_MUTE_LEFT | ONYX_MUTE_RIGHT,
+	0, /* no deemphasis */
+	ONYX_DAC_FILTER_ALWAYS,
+	ONYX_OUTPHASE_INVERTED,
+	(-1 /*dB*/ + 8) & 0xF, /* line in selected, -1 dB gain*/
+	ONYX_ADC_HPF_ALWAYS,
+	(1<<2),	/* pcm audio */
+	2,	/* category: pcm coder */
+	0,	/* sampling frequency 44.1 kHz, clock accuracy level II */
+	1	/* 24 bit depth */
+};
+
+/* reset registers of chip, either to initial or to previous values */
+static int onyx_register_init(struct onyx *onyx)
+{
+	int i;
+	u8 val;
+	u8 regs[sizeof(initial_values)];
+
+	if (!onyx->initialised) {
+		memcpy(regs, initial_values, sizeof(initial_values));
+		if (onyx_read_register(onyx, ONYX_REG_CONTROL, &val))
+			return -1;
+		val &= ~ONYX_SILICONVERSION;
+		val |= initial_values[3];
+		regs[3] = val;
+	} else {
+		for (i=0; i<sizeof(register_map); i++)
+			regs[i] = onyx->cache[register_map[i]-FIRSTREGISTER];
+	}
+
+	for (i=0; i<sizeof(register_map); i++) {
+		if (onyx_write_register(onyx, register_map[i], regs[i]))
+			return -1;
+	}
+	onyx->initialised = 1;
+	return 0;
+}
+
+static struct transfer_info onyx_transfers[] = {
+	/* this is first so we can skip it if no input is present...
+	 * No hardware exists with that, but it's here as an example
+	 * of what to do :) */
+	{
+		/* analog input */
+		.formats = SNDRV_PCM_FMTBIT_S8 |
+			   SNDRV_PCM_FMTBIT_S16_BE |
+			   SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.transfer_in = 1,
+		.must_be_clock_source = 0,
+		.tag = 0,
+	},
+	{
+		/* if analog and digital are currently off, anything should go,
+		 * so this entry describes everything we can do... */
+		.formats = SNDRV_PCM_FMTBIT_S8 |
+			   SNDRV_PCM_FMTBIT_S16_BE |
+			   SNDRV_PCM_FMTBIT_S24_BE
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+			   | SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+#endif
+		,
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.tag = 0,
+	},
+	{
+		/* analog output */
+		.formats = SNDRV_PCM_FMTBIT_S8 |
+			   SNDRV_PCM_FMTBIT_S16_BE |
+			   SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_8000_96000,
+		.transfer_in = 0,
+		.must_be_clock_source = 0,
+		.tag = 1,
+	},
+	{
+		/* digital pcm output, also possible for analog out */
+		.formats = SNDRV_PCM_FMTBIT_S8 |
+			   SNDRV_PCM_FMTBIT_S16_BE |
+			   SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_32000 |
+			 SNDRV_PCM_RATE_44100 |
+			 SNDRV_PCM_RATE_48000,
+		.transfer_in = 0,
+		.must_be_clock_source = 0,
+		.tag = 2,
+	},
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+	/* Once alsa gets supports for this kind of thing we can add it... */
+	{
+		/* digital compressed output */
+		.formats =  SNDRV_PCM_FMTBIT_COMPRESSED_16BE,
+		.rates = SNDRV_PCM_RATE_32000 |
+			 SNDRV_PCM_RATE_44100 |
+			 SNDRV_PCM_RATE_48000,
+		.tag = 2,
+	},
+#endif
+	{}
+};
+
+static int onyx_usable(struct codec_info_item *cii,
+		       struct transfer_info *ti,
+		       struct transfer_info *out)
+{
+	u8 v;
+	struct onyx *onyx = cii->codec_data;
+	int spdif_enabled, analog_enabled;
+
+	guard(mutex)(&onyx->mutex);
+	onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+	spdif_enabled = !!(v & ONYX_SPDIF_ENABLE);
+	onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+	analog_enabled =
+		(v & (ONYX_MUTE_RIGHT|ONYX_MUTE_LEFT))
+		 != (ONYX_MUTE_RIGHT|ONYX_MUTE_LEFT);
+
+	switch (ti->tag) {
+	case 0: return 1;
+	case 1:	return analog_enabled;
+	case 2: return spdif_enabled;
+	}
+	return 1;
+}
+
+static int onyx_prepare(struct codec_info_item *cii,
+			struct bus_info *bi,
+			struct snd_pcm_substream *substream)
+{
+	u8 v;
+	struct onyx *onyx = cii->codec_data;
+
+	guard(mutex)(&onyx->mutex);
+
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+	if (substream->runtime->format == SNDRV_PCM_FMTBIT_COMPRESSED_16BE) {
+		/* mute and lock analog output */
+		onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+		if (onyx_write_register(onyx,
+					ONYX_REG_DAC_CONTROL,
+					v | ONYX_MUTE_RIGHT | ONYX_MUTE_LEFT))
+			return -EBUSY;
+		onyx->analog_locked = 1;
+		return 0;
+	}
+#endif
+	switch (substream->runtime->rate) {
+	case 32000:
+	case 44100:
+	case 48000:
+		if (onyx->codec.connected & 2)
+			return onyx_set_spdif_pcm_rate(onyx,
+						       substream->runtime->rate);
+		return 0;
+	default:
+		/* got some rate that the digital output can't do,
+		 * so disable and lock it */
+		onyx_read_register(cii->codec_data, ONYX_REG_DIG_INFO4, &v);
+		if (onyx_write_register(onyx,
+					ONYX_REG_DIG_INFO4,
+					v & ~ONYX_SPDIF_ENABLE))
+			return -EBUSY;
+		onyx->spdif_locked = 1;
+		return 0;
+	}
+
+	return -EBUSY;
+}
+
+static int onyx_open(struct codec_info_item *cii,
+		     struct snd_pcm_substream *substream)
+{
+	struct onyx *onyx = cii->codec_data;
+
+	guard(mutex)(&onyx->mutex);
+	onyx->open_count++;
+
+	return 0;
+}
+
+static int onyx_close(struct codec_info_item *cii,
+		      struct snd_pcm_substream *substream)
+{
+	struct onyx *onyx = cii->codec_data;
+
+	guard(mutex)(&onyx->mutex);
+	onyx->open_count--;
+	if (!onyx->open_count)
+		onyx->spdif_locked = onyx->analog_locked = 0;
+
+	return 0;
+}
+
+static int onyx_switch_clock(struct codec_info_item *cii,
+			     enum clock_switch what)
+{
+	struct onyx *onyx = cii->codec_data;
+
+	guard(mutex)(&onyx->mutex);
+	/* this *MUST* be more elaborate later... */
+	switch (what) {
+	case CLOCK_SWITCH_PREPARE_SLAVE:
+		onyx->codec.gpio->methods->all_amps_off(onyx->codec.gpio);
+		break;
+	case CLOCK_SWITCH_SLAVE:
+		onyx->codec.gpio->methods->all_amps_restore(onyx->codec.gpio);
+		break;
+	default: /* silence warning */
+		break;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int onyx_suspend(struct codec_info_item *cii, pm_message_t state)
+{
+	struct onyx *onyx = cii->codec_data;
+	u8 v;
+
+	guard(mutex)(&onyx->mutex);
+	if (onyx_read_register(onyx, ONYX_REG_CONTROL, &v))
+		return -ENXIO;
+	onyx_write_register(onyx, ONYX_REG_CONTROL, v | ONYX_ADPSV | ONYX_DAPSV);
+	/* Apple does a sleep here but the datasheet says to do it on resume */
+	return 0;
+}
+
+static int onyx_resume(struct codec_info_item *cii)
+{
+	struct onyx *onyx = cii->codec_data;
+	u8 v;
+
+	guard(mutex)(&onyx->mutex);
+
+	/* reset codec */
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+	msleep(1);
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 1);
+	msleep(1);
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+	msleep(1);
+
+	/* take codec out of suspend (if it still is after reset) */
+	if (onyx_read_register(onyx, ONYX_REG_CONTROL, &v))
+		return -ENXIO;
+	onyx_write_register(onyx, ONYX_REG_CONTROL, v & ~(ONYX_ADPSV | ONYX_DAPSV));
+	/* FIXME: should divide by sample rate, but 8k is the lowest we go */
+	msleep(2205000/8000);
+	/* reset all values */
+	onyx_register_init(onyx);
+	return 0;
+}
+
+#endif /* CONFIG_PM */
+
+static struct codec_info onyx_codec_info = {
+	.transfers = onyx_transfers,
+	.sysclock_factor = 256,
+	.bus_factor = 64,
+	.owner = THIS_MODULE,
+	.usable = onyx_usable,
+	.prepare = onyx_prepare,
+	.open = onyx_open,
+	.close = onyx_close,
+	.switch_clock = onyx_switch_clock,
+#ifdef CONFIG_PM
+	.suspend = onyx_suspend,
+	.resume = onyx_resume,
+#endif
+};
+
+static int onyx_init_codec(struct aoa_codec *codec)
+{
+	struct onyx *onyx = codec_to_onyx(codec);
+	struct snd_kcontrol *ctl;
+	struct codec_info *ci = &onyx_codec_info;
+	u8 v;
+	int err;
+
+	if (!onyx->codec.gpio || !onyx->codec.gpio->methods) {
+		printk(KERN_ERR PFX "gpios not assigned!!\n");
+		return -EINVAL;
+	}
+
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+	msleep(1);
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 1);
+	msleep(1);
+	onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+	msleep(1);
+
+	if (onyx_register_init(onyx)) {
+		printk(KERN_ERR PFX "failed to initialise onyx registers\n");
+		return -ENODEV;
+	}
+
+	if (aoa_snd_device_new(SNDRV_DEV_CODEC, onyx, &ops)) {
+		printk(KERN_ERR PFX "failed to create onyx snd device!\n");
+		return -ENODEV;
+	}
+
+	/* nothing connected? what a joke! */
+	if ((onyx->codec.connected & 0xF) == 0)
+		return -ENOTCONN;
+
+	/* if no inputs are present... */
+	if ((onyx->codec.connected & 0xC) == 0) {
+		if (!onyx->codec_info)
+			onyx->codec_info = kmalloc_obj(struct codec_info);
+		if (!onyx->codec_info)
+			return -ENOMEM;
+		ci = onyx->codec_info;
+		*ci = onyx_codec_info;
+		ci->transfers++;
+	}
+
+	/* if no outputs are present... */
+	if ((onyx->codec.connected & 3) == 0) {
+		if (!onyx->codec_info)
+			onyx->codec_info = kmalloc_obj(struct codec_info);
+		if (!onyx->codec_info)
+			return -ENOMEM;
+		ci = onyx->codec_info;
+		/* this is fine as there have to be inputs
+		 * if we end up in this part of the code */
+		*ci = onyx_codec_info;
+		ci->transfers[1].formats = 0;
+	}
+
+	if (onyx->codec.soundbus_dev->attach_codec(onyx->codec.soundbus_dev,
+						   aoa_get_card(),
+						   ci, onyx)) {
+		printk(KERN_ERR PFX "error creating onyx pcm\n");
+		return -ENODEV;
+	}
+#define ADDCTL(n)							\
+	do {								\
+		ctl = snd_ctl_new1(&n, onyx);				\
+		if (ctl) {						\
+			ctl->id.device =				\
+				onyx->codec.soundbus_dev->pcm->device;	\
+			err = aoa_snd_ctl_add(ctl);			\
+			if (err)					\
+				goto error;				\
+		}							\
+	} while (0)
+
+	if (onyx->codec.soundbus_dev->pcm) {
+		/* give the user appropriate controls
+		 * depending on what inputs are connected */
+		if ((onyx->codec.connected & 0xC) == 0xC)
+			ADDCTL(capture_source_control);
+		else if (onyx->codec.connected & 4)
+			onyx_set_capture_source(onyx, 0);
+		else
+			onyx_set_capture_source(onyx, 1);
+		if (onyx->codec.connected & 0xC)
+			ADDCTL(inputgain_control);
+
+		/* depending on what output is connected,
+		 * give the user appropriate controls */
+		if (onyx->codec.connected & 1) {
+			ADDCTL(volume_control);
+			ADDCTL(mute_control);
+			ADDCTL(ovr1_control);
+			ADDCTL(flt0_control);
+			ADDCTL(hpf_control);
+			ADDCTL(dm12_control);
+			/* spdif control defaults to off */
+		}
+		if (onyx->codec.connected & 2) {
+			ADDCTL(onyx_spdif_mask);
+			ADDCTL(onyx_spdif_ctrl);
+		}
+		if ((onyx->codec.connected & 3) == 3)
+			ADDCTL(spdif_control);
+		/* if only S/PDIF is connected, enable it unconditionally */
+		if ((onyx->codec.connected & 3) == 2) {
+			onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+			v |= ONYX_SPDIF_ENABLE;
+			onyx_write_register(onyx, ONYX_REG_DIG_INFO4, v);
+		}
+	}
+#undef ADDCTL
+	printk(KERN_INFO PFX "attached to onyx codec via i2c\n");
+
+	return 0;
+ error:
+	onyx->codec.soundbus_dev->detach_codec(onyx->codec.soundbus_dev, onyx);
+	snd_device_free(aoa_get_card(), onyx);
+	return err;
+}
+
+static void onyx_exit_codec(struct aoa_codec *codec)
+{
+	struct onyx *onyx = codec_to_onyx(codec);
+
+	if (!onyx->codec.soundbus_dev) {
+		printk(KERN_ERR PFX "onyx_exit_codec called without soundbus_dev!\n");
+		return;
+	}
+	onyx->codec.soundbus_dev->detach_codec(onyx->codec.soundbus_dev, onyx);
+}
+
+static int onyx_i2c_probe(struct i2c_client *client)
+{
+	struct device_node *node = client->dev.of_node;
+	struct onyx *onyx;
+	u8 dummy;
+
+	onyx = kzalloc_obj(struct onyx);
+
+	if (!onyx)
+		return -ENOMEM;
+
+	mutex_init(&onyx->mutex);
+	onyx->i2c = client;
+	i2c_set_clientdata(client, onyx);
+
+	/* we try to read from register ONYX_REG_CONTROL
+	 * to check if the codec is present */
+	if (onyx_read_register(onyx, ONYX_REG_CONTROL, &dummy) != 0) {
+		printk(KERN_ERR PFX "failed to read control register\n");
+		goto fail;
+	}
+
+	strscpy(onyx->codec.name, "onyx");
+	onyx->codec.owner = THIS_MODULE;
+	onyx->codec.init = onyx_init_codec;
+	onyx->codec.exit = onyx_exit_codec;
+	onyx->codec.node = of_node_get(node);
+
+	if (aoa_codec_register(&onyx->codec)) {
+		goto fail_put;
+	}
+	printk(KERN_DEBUG PFX "created and attached onyx instance\n");
+	return 0;
+ fail_put:
+	of_node_put(onyx->codec.node);
+ fail:
+	kfree(onyx);
+	return -ENODEV;
+}
+
+static void onyx_i2c_remove(struct i2c_client *client)
+{
+	struct onyx *onyx = i2c_get_clientdata(client);
+
+	aoa_codec_unregister(&onyx->codec);
+	of_node_put(onyx->codec.node);
+	kfree(onyx->codec_info);
+	kfree(onyx);
+}
+
+static const struct i2c_device_id onyx_i2c_id[] = {
+	{ "MAC,pcm3052" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c,onyx_i2c_id);
+
+static struct i2c_driver onyx_driver = {
+	.driver = {
+		.name = "aoa_codec_onyx",
+	},
+	.probe = onyx_i2c_probe,
+	.remove = onyx_i2c_remove,
+	.id_table = onyx_i2c_id,
+};
+
+module_i2c_driver(onyx_driver);
diff --git a/sound/aoa/codecs/onyx.h b/sound/aoa/codecs/onyx.h
new file mode 100644
index 000000000..bbdca841f
--- /dev/null
+++ b/sound/aoa/codecs/onyx.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple Onboard Audio driver for Onyx codec (header)
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#ifndef __SND_AOA_CODEC_ONYX_H
+#define __SND_AOA_CODEC_ONYX_H
+#include <linux/i2c.h>
+#include <asm/pmac_low_i2c.h>
+
+/* PCM3052 register definitions */
+
+/* the attenuation registers take values from
+ * -1 (0dB) to -127 (-63.0 dB) or others (muted) */
+#define ONYX_REG_DAC_ATTEN_LEFT		65
+#define FIRSTREGISTER			ONYX_REG_DAC_ATTEN_LEFT
+#define ONYX_REG_DAC_ATTEN_RIGHT	66
+
+#define ONYX_REG_CONTROL		67
+#	define ONYX_MRST		(1<<7)
+#	define ONYX_SRST		(1<<6)
+#	define ONYX_ADPSV		(1<<5)
+#	define ONYX_DAPSV		(1<<4)
+#	define ONYX_SILICONVERSION	(1<<0)
+/* all others reserved */
+
+#define ONYX_REG_DAC_CONTROL		68
+#	define ONYX_OVR1		(1<<6)
+#	define ONYX_MUTE_RIGHT		(1<<1)
+#	define ONYX_MUTE_LEFT		(1<<0)
+
+#define ONYX_REG_DAC_DEEMPH		69
+#	define ONYX_DIGDEEMPH_SHIFT	5
+#	define ONYX_DIGDEEMPH_MASK	(3<<ONYX_DIGDEEMPH_SHIFT)
+#	define ONYX_DIGDEEMPH_CTRL	(1<<4)
+
+#define ONYX_REG_DAC_FILTER		70
+#	define ONYX_ROLLOFF_FAST	(1<<5)
+#	define ONYX_DAC_FILTER_ALWAYS	(1<<2)
+
+#define	ONYX_REG_DAC_OUTPHASE		71
+#	define ONYX_OUTPHASE_INVERTED	(1<<0)
+
+#define ONYX_REG_ADC_CONTROL		72
+#	define ONYX_ADC_INPUT_MIC	(1<<5)
+/* 8 + input gain in dB, valid range for input gain is -4 .. 20 dB */
+#	define ONYX_ADC_PGA_GAIN_MASK	0x1f
+
+#define ONYX_REG_ADC_HPF_BYPASS		75
+#	define ONYX_HPF_DISABLE		(1<<3)
+#	define ONYX_ADC_HPF_ALWAYS	(1<<2)
+
+#define ONYX_REG_DIG_INFO1		77
+#	define ONYX_MASK_DIN_TO_BPZ	(1<<7)
+/* bits 1-5 control channel bits 1-5 */
+#	define ONYX_DIGOUT_DISABLE	(1<<0)
+
+#define ONYX_REG_DIG_INFO2		78
+/* controls channel bits 8-15 */
+
+#define ONYX_REG_DIG_INFO3		79
+/* control channel bits 24-29, high 2 bits reserved */
+
+#define ONYX_REG_DIG_INFO4		80
+#	define ONYX_VALIDL		(1<<7)
+#	define ONYX_VALIDR		(1<<6)
+#	define ONYX_SPDIF_ENABLE	(1<<5)
+/* lower 4 bits control bits 32-35 of channel control and word length */
+#	define ONYX_WORDLEN_MASK	(0xF)
+
+#endif /* __SND_AOA_CODEC_ONYX_H */
diff --git a/sound/aoa/codecs/tas-basstreble.h b/sound/aoa/codecs/tas-basstreble.h
new file mode 100644
index 000000000..14dc4e9ee
--- /dev/null
+++ b/sound/aoa/codecs/tas-basstreble.h
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This file is only included exactly once!
+ *
+ * The tables here are derived from the tas3004 datasheet,
+ * modulo typo corrections and some smoothing...
+ */
+
+#define TAS3004_TREBLE_MIN	0
+#define TAS3004_TREBLE_MAX	72
+#define TAS3004_BASS_MIN	0
+#define TAS3004_BASS_MAX	72
+#define TAS3004_TREBLE_ZERO	36
+#define TAS3004_BASS_ZERO	36
+
+static const u8 tas3004_treble_table[] = {
+	150, /* -18 dB */
+	149,
+	148,
+	147,
+	146,
+	145,
+	144,
+	143,
+	142,
+	141,
+	140,
+	139,
+	138,
+	137,
+	136,
+	135,
+	134,
+	133,
+	132,
+	131,
+	130,
+	129,
+	128,
+	127,
+	126,
+	125,
+	124,
+	123,
+	122,
+	121,
+	120,
+	119,
+	118,
+	117,
+	116,
+	115,
+	114, /* 0 dB */
+	113,
+	112,
+	111,
+	109,
+	108,
+	107,
+	105,
+	104,
+	103,
+	101,
+	99,
+	98,
+	96,
+	93,
+	91,
+	89,
+	86,
+	83,
+	81,
+	77,
+	74,
+	71,
+	67,
+	63,
+	59,
+	54,
+	49,
+	44,
+	38,
+	32,
+	26,
+	19,
+	10,
+	4,
+	2,
+	1, /* +18 dB */
+};
+
+static inline u8 tas3004_treble(int idx)
+{
+	return tas3004_treble_table[idx];
+}
+
+/* I only save the difference here to the treble table
+ * so that the binary is smaller...
+ * I have also ignored completely differences of
+ * +/- 1
+ */
+static const s8 tas3004_bass_diff_to_treble[] = {
+	2, /* 7 dB, offset 50 */
+	2,
+	2,
+	2,
+	2,
+	1,
+	2,
+	2,
+	2,
+	3,
+	4,
+	4,
+	5,
+	6,
+	7,
+	8,
+	9,
+	10,
+	11,
+	14,
+	13,
+	8,
+	1, /* 18 dB */
+};
+
+static inline u8 tas3004_bass(int idx)
+{
+	u8 result = tas3004_treble_table[idx];
+
+	if (idx >= 50)
+		result += tas3004_bass_diff_to_treble[idx-50];
+	return result;
+}
diff --git a/sound/aoa/codecs/tas-gain-table.h b/sound/aoa/codecs/tas-gain-table.h
new file mode 100644
index 000000000..c9ea01488
--- /dev/null
+++ b/sound/aoa/codecs/tas-gain-table.h
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ This is the program used to generate below table.
+
+#include <stdio.h>
+#include <math.h>
+int main() {
+  int dB2;
+  printf("/" "* This file is only included exactly once!\n");
+  printf(" *\n");
+  printf(" * If they'd only tell us that generating this table was\n");
+  printf(" * as easy as calculating\n");
+  printf(" *      hwvalue = 1048576.0*exp(0.057564628*dB*2)\n");
+  printf(" * :) *" "/\n");
+  printf("static int tas_gaintable[] = {\n");
+  printf("	0x000000, /" "* -infinity dB *" "/\n");
+  for (dB2=-140;dB2<=36;dB2++)
+    printf("	0x%.6x, /" "* %-02.1f dB *" "/\n", (int)(1048576.0*exp(0.057564628*dB2)), dB2/2.0);
+  printf("};\n\n");
+}
+
+*/
+
+/* This file is only included exactly once!
+ *
+ * If they'd only tell us that generating this table was
+ * as easy as calculating
+ *      hwvalue = 1048576.0*exp(0.057564628*dB*2)
+ * :) */
+static const int tas_gaintable[] = {
+	0x000000, /* -infinity dB */
+	0x00014b, /* -70.0 dB */
+	0x00015f, /* -69.5 dB */
+	0x000174, /* -69.0 dB */
+	0x00018a, /* -68.5 dB */
+	0x0001a1, /* -68.0 dB */
+	0x0001ba, /* -67.5 dB */
+	0x0001d4, /* -67.0 dB */
+	0x0001f0, /* -66.5 dB */
+	0x00020d, /* -66.0 dB */
+	0x00022c, /* -65.5 dB */
+	0x00024d, /* -65.0 dB */
+	0x000270, /* -64.5 dB */
+	0x000295, /* -64.0 dB */
+	0x0002bc, /* -63.5 dB */
+	0x0002e6, /* -63.0 dB */
+	0x000312, /* -62.5 dB */
+	0x000340, /* -62.0 dB */
+	0x000372, /* -61.5 dB */
+	0x0003a6, /* -61.0 dB */
+	0x0003dd, /* -60.5 dB */
+	0x000418, /* -60.0 dB */
+	0x000456, /* -59.5 dB */
+	0x000498, /* -59.0 dB */
+	0x0004de, /* -58.5 dB */
+	0x000528, /* -58.0 dB */
+	0x000576, /* -57.5 dB */
+	0x0005c9, /* -57.0 dB */
+	0x000620, /* -56.5 dB */
+	0x00067d, /* -56.0 dB */
+	0x0006e0, /* -55.5 dB */
+	0x000748, /* -55.0 dB */
+	0x0007b7, /* -54.5 dB */
+	0x00082c, /* -54.0 dB */
+	0x0008a8, /* -53.5 dB */
+	0x00092b, /* -53.0 dB */
+	0x0009b6, /* -52.5 dB */
+	0x000a49, /* -52.0 dB */
+	0x000ae5, /* -51.5 dB */
+	0x000b8b, /* -51.0 dB */
+	0x000c3a, /* -50.5 dB */
+	0x000cf3, /* -50.0 dB */
+	0x000db8, /* -49.5 dB */
+	0x000e88, /* -49.0 dB */
+	0x000f64, /* -48.5 dB */
+	0x00104e, /* -48.0 dB */
+	0x001145, /* -47.5 dB */
+	0x00124b, /* -47.0 dB */
+	0x001361, /* -46.5 dB */
+	0x001487, /* -46.0 dB */
+	0x0015be, /* -45.5 dB */
+	0x001708, /* -45.0 dB */
+	0x001865, /* -44.5 dB */
+	0x0019d8, /* -44.0 dB */
+	0x001b60, /* -43.5 dB */
+	0x001cff, /* -43.0 dB */
+	0x001eb7, /* -42.5 dB */
+	0x002089, /* -42.0 dB */
+	0x002276, /* -41.5 dB */
+	0x002481, /* -41.0 dB */
+	0x0026ab, /* -40.5 dB */
+	0x0028f5, /* -40.0 dB */
+	0x002b63, /* -39.5 dB */
+	0x002df5, /* -39.0 dB */
+	0x0030ae, /* -38.5 dB */
+	0x003390, /* -38.0 dB */
+	0x00369e, /* -37.5 dB */
+	0x0039db, /* -37.0 dB */
+	0x003d49, /* -36.5 dB */
+	0x0040ea, /* -36.0 dB */
+	0x0044c3, /* -35.5 dB */
+	0x0048d6, /* -35.0 dB */
+	0x004d27, /* -34.5 dB */
+	0x0051b9, /* -34.0 dB */
+	0x005691, /* -33.5 dB */
+	0x005bb2, /* -33.0 dB */
+	0x006121, /* -32.5 dB */
+	0x0066e3, /* -32.0 dB */
+	0x006cfb, /* -31.5 dB */
+	0x007370, /* -31.0 dB */
+	0x007a48, /* -30.5 dB */
+	0x008186, /* -30.0 dB */
+	0x008933, /* -29.5 dB */
+	0x009154, /* -29.0 dB */
+	0x0099f1, /* -28.5 dB */
+	0x00a310, /* -28.0 dB */
+	0x00acba, /* -27.5 dB */
+	0x00b6f6, /* -27.0 dB */
+	0x00c1cd, /* -26.5 dB */
+	0x00cd49, /* -26.0 dB */
+	0x00d973, /* -25.5 dB */
+	0x00e655, /* -25.0 dB */
+	0x00f3fb, /* -24.5 dB */
+	0x010270, /* -24.0 dB */
+	0x0111c0, /* -23.5 dB */
+	0x0121f9, /* -23.0 dB */
+	0x013328, /* -22.5 dB */
+	0x01455b, /* -22.0 dB */
+	0x0158a2, /* -21.5 dB */
+	0x016d0e, /* -21.0 dB */
+	0x0182af, /* -20.5 dB */
+	0x019999, /* -20.0 dB */
+	0x01b1de, /* -19.5 dB */
+	0x01cb94, /* -19.0 dB */
+	0x01e6cf, /* -18.5 dB */
+	0x0203a7, /* -18.0 dB */
+	0x022235, /* -17.5 dB */
+	0x024293, /* -17.0 dB */
+	0x0264db, /* -16.5 dB */
+	0x02892c, /* -16.0 dB */
+	0x02afa3, /* -15.5 dB */
+	0x02d862, /* -15.0 dB */
+	0x03038a, /* -14.5 dB */
+	0x033142, /* -14.0 dB */
+	0x0361af, /* -13.5 dB */
+	0x0394fa, /* -13.0 dB */
+	0x03cb50, /* -12.5 dB */
+	0x0404de, /* -12.0 dB */
+	0x0441d5, /* -11.5 dB */
+	0x048268, /* -11.0 dB */
+	0x04c6d0, /* -10.5 dB */
+	0x050f44, /* -10.0 dB */
+	0x055c04, /* -9.5 dB */
+	0x05ad50, /* -9.0 dB */
+	0x06036e, /* -8.5 dB */
+	0x065ea5, /* -8.0 dB */
+	0x06bf44, /* -7.5 dB */
+	0x07259d, /* -7.0 dB */
+	0x079207, /* -6.5 dB */
+	0x0804dc, /* -6.0 dB */
+	0x087e80, /* -5.5 dB */
+	0x08ff59, /* -5.0 dB */
+	0x0987d5, /* -4.5 dB */
+	0x0a1866, /* -4.0 dB */
+	0x0ab189, /* -3.5 dB */
+	0x0b53be, /* -3.0 dB */
+	0x0bff91, /* -2.5 dB */
+	0x0cb591, /* -2.0 dB */
+	0x0d765a, /* -1.5 dB */
+	0x0e4290, /* -1.0 dB */
+	0x0f1adf, /* -0.5 dB */
+	0x100000, /* 0.0 dB */
+	0x10f2b4, /* 0.5 dB */
+	0x11f3c9, /* 1.0 dB */
+	0x13041a, /* 1.5 dB */
+	0x14248e, /* 2.0 dB */
+	0x15561a, /* 2.5 dB */
+	0x1699c0, /* 3.0 dB */
+	0x17f094, /* 3.5 dB */
+	0x195bb8, /* 4.0 dB */
+	0x1adc61, /* 4.5 dB */
+	0x1c73d5, /* 5.0 dB */
+	0x1e236d, /* 5.5 dB */
+	0x1fec98, /* 6.0 dB */
+	0x21d0d9, /* 6.5 dB */
+	0x23d1cd, /* 7.0 dB */
+	0x25f125, /* 7.5 dB */
+	0x2830af, /* 8.0 dB */
+	0x2a9254, /* 8.5 dB */
+	0x2d1818, /* 9.0 dB */
+	0x2fc420, /* 9.5 dB */
+	0x3298b0, /* 10.0 dB */
+	0x35982f, /* 10.5 dB */
+	0x38c528, /* 11.0 dB */
+	0x3c224c, /* 11.5 dB */
+	0x3fb278, /* 12.0 dB */
+	0x4378b0, /* 12.5 dB */
+	0x477829, /* 13.0 dB */
+	0x4bb446, /* 13.5 dB */
+	0x5030a1, /* 14.0 dB */
+	0x54f106, /* 14.5 dB */
+	0x59f980, /* 15.0 dB */
+	0x5f4e52, /* 15.5 dB */
+	0x64f403, /* 16.0 dB */
+	0x6aef5e, /* 16.5 dB */
+	0x714575, /* 17.0 dB */
+	0x77fbaa, /* 17.5 dB */
+	0x7f17af, /* 18.0 dB */
+};
+
diff --git a/sound/aoa/codecs/tas.c b/sound/aoa/codecs/tas.c
new file mode 100644
index 000000000..25214d3da
--- /dev/null
+++ b/sound/aoa/codecs/tas.c
@@ -0,0 +1,910 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio driver for tas codec
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * Open questions:
+ *  - How to distinguish between 3004 and versions?
+ *
+ * FIXMEs:
+ *  - This codec driver doesn't honour the 'connected'
+ *    property of the aoa_codec struct, hence if
+ *    it is used in machines where not everything is
+ *    connected it will display wrong mixer elements.
+ *  - Driver assumes that the microphone is always
+ *    monaureal and connected to the right channel of
+ *    the input. This should also be a codec-dependent
+ *    flag, maybe the codec should have 3 different
+ *    bits for the three different possibilities how
+ *    it can be hooked up...
+ *    But as long as I don't see any hardware hooked
+ *    up that way...
+ *  - As Apple notes in their code, the tas3004 seems
+ *    to delay the right channel by one sample. You can
+ *    see this when for example recording stereo in
+ *    audacity, or recording the tas output via cable
+ *    on another machine (use a sinus generator or so).
+ *    I tried programming the BiQuads but couldn't
+ *    make the delay work, maybe someone can read the
+ *    datasheet and fix it. The relevant Apple comment
+ *    is in AppleTAS3004Audio.cpp lines 1637 ff. Note
+ *    that their comment describing how they program
+ *    the filters sucks...
+ *
+ * Other things:
+ *  - this should actually register *two* aoa_codec
+ *    structs since it has two inputs. Then it must
+ *    use the prepare callback to forbid running the
+ *    secondary output on a different clock.
+ *    Also, whatever bus knows how to do this must
+ *    provide two soundbus_dev devices and the fabric
+ *    must be able to link them correctly.
+ *
+ *    I don't even know if Apple ever uses the second
+ *    port on the tas3004 though, I don't think their
+ *    i2s controllers can even do it. OTOH, they all
+ *    derive the clocks from common clocks, so it
+ *    might just be possible. The framework allows the
+ *    codec to refine the transfer_info items in the
+ *    usable callback, so we can simply remove the
+ *    rates the second instance is not using when it
+ *    actually is in use.
+ *    Maybe we'll need to make the sound busses have
+ *    a 'clock group id' value so the codec can
+ *    determine if the two outputs can be driven at
+ *    the same time. But that is likely overkill, up
+ *    to the fabric to not link them up incorrectly,
+ *    and up to the hardware designer to not wire
+ *    them up in some weird unusable way.
+ */
+#include <linux/i2c.h>
+#include <asm/pmac_low_i2c.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("tas codec driver for snd-aoa");
+
+#include "tas.h"
+#include "tas-gain-table.h"
+#include "tas-basstreble.h"
+#include "../aoa.h"
+#include "../soundbus/soundbus.h"
+
+#define PFX "snd-aoa-codec-tas: "
+
+
+struct tas {
+	struct aoa_codec	codec;
+	struct i2c_client	*i2c;
+	u32			mute_l:1, mute_r:1 ,
+				controls_created:1 ,
+				drc_enabled:1,
+				hw_enabled:1;
+	u8			cached_volume_l, cached_volume_r;
+	u8			mixer_l[3], mixer_r[3];
+	u8			bass, treble;
+	u8			acr;
+	int			drc_range;
+	/* protects hardware access against concurrency from
+	 * userspace when hitting controls and during
+	 * codec init/suspend/resume */
+	struct mutex		mtx;
+};
+
+static int tas_reset_init(struct tas *tas);
+
+static struct tas *codec_to_tas(struct aoa_codec *codec)
+{
+	return container_of(codec, struct tas, codec);
+}
+
+static inline int tas_write_reg(struct tas *tas, u8 reg, u8 len, u8 *data)
+{
+	if (len == 1)
+		return i2c_smbus_write_byte_data(tas->i2c, reg, *data);
+	else
+		return i2c_smbus_write_i2c_block_data(tas->i2c, reg, len, data);
+}
+
+static void tas3004_set_drc(struct tas *tas)
+{
+	unsigned char val[6];
+
+	if (tas->drc_enabled)
+		val[0] = 0x50; /* 3:1 above threshold */
+	else
+		val[0] = 0x51; /* disabled */
+	val[1] = 0x02; /* 1:1 below threshold */
+	if (tas->drc_range > 0xef)
+		val[2] = 0xef;
+	else if (tas->drc_range < 0)
+		val[2] = 0x00;
+	else
+		val[2] = tas->drc_range;
+	val[3] = 0xb0;
+	val[4] = 0x60;
+	val[5] = 0xa0;
+
+	tas_write_reg(tas, TAS_REG_DRC, 6, val);
+}
+
+static void tas_set_treble(struct tas *tas)
+{
+	u8 tmp;
+
+	tmp = tas3004_treble(tas->treble);
+	tas_write_reg(tas, TAS_REG_TREBLE, 1, &tmp);
+}
+
+static void tas_set_bass(struct tas *tas)
+{
+	u8 tmp;
+
+	tmp = tas3004_bass(tas->bass);
+	tas_write_reg(tas, TAS_REG_BASS, 1, &tmp);
+}
+
+static void tas_set_volume(struct tas *tas)
+{
+	u8 block[6];
+	int tmp;
+	u8 left, right;
+
+	left = tas->cached_volume_l;
+	right = tas->cached_volume_r;
+
+	if (left > 177) left = 177;
+	if (right > 177) right = 177;
+
+	if (tas->mute_l) left = 0;
+	if (tas->mute_r) right = 0;
+
+	/* analysing the volume and mixer tables shows
+	 * that they are similar enough when we shift
+	 * the mixer table down by 4 bits. The error
+	 * is miniscule, in just one item the error
+	 * is 1, at a value of 0x07f17b (mixer table
+	 * value is 0x07f17a) */
+	tmp = tas_gaintable[left];
+	block[0] = tmp>>20;
+	block[1] = tmp>>12;
+	block[2] = tmp>>4;
+	tmp = tas_gaintable[right];
+	block[3] = tmp>>20;
+	block[4] = tmp>>12;
+	block[5] = tmp>>4;
+	tas_write_reg(tas, TAS_REG_VOL, 6, block);
+}
+
+static void tas_set_mixer(struct tas *tas)
+{
+	u8 block[9];
+	int tmp, i;
+	u8 val;
+
+	for (i=0;i<3;i++) {
+		val = tas->mixer_l[i];
+		if (val > 177) val = 177;
+		tmp = tas_gaintable[val];
+		block[3*i+0] = tmp>>16;
+		block[3*i+1] = tmp>>8;
+		block[3*i+2] = tmp;
+	}
+	tas_write_reg(tas, TAS_REG_LMIX, 9, block);
+
+	for (i=0;i<3;i++) {
+		val = tas->mixer_r[i];
+		if (val > 177) val = 177;
+		tmp = tas_gaintable[val];
+		block[3*i+0] = tmp>>16;
+		block[3*i+1] = tmp>>8;
+		block[3*i+2] = tmp;
+	}
+	tas_write_reg(tas, TAS_REG_RMIX, 9, block);
+}
+
+/* alsa stuff */
+
+static int tas_dev_register(struct snd_device *dev)
+{
+	return 0;
+}
+
+static const struct snd_device_ops ops = {
+	.dev_register = tas_dev_register,
+};
+
+static int tas_snd_vol_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 177;
+	return 0;
+}
+
+static int tas_snd_vol_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->cached_volume_l;
+	ucontrol->value.integer.value[1] = tas->cached_volume_r;
+	return 0;
+}
+
+static int tas_snd_vol_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	if (ucontrol->value.integer.value[0] < 0 ||
+	    ucontrol->value.integer.value[0] > 177)
+		return -EINVAL;
+	if (ucontrol->value.integer.value[1] < 0 ||
+	    ucontrol->value.integer.value[1] > 177)
+		return -EINVAL;
+
+	guard(mutex)(&tas->mtx);
+	if (tas->cached_volume_l == ucontrol->value.integer.value[0]
+	 && tas->cached_volume_r == ucontrol->value.integer.value[1])
+		return 0;
+
+	tas->cached_volume_l = ucontrol->value.integer.value[0];
+	tas->cached_volume_r = ucontrol->value.integer.value[1];
+	if (tas->hw_enabled)
+		tas_set_volume(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new volume_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Playback Volume",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_vol_info,
+	.get = tas_snd_vol_get,
+	.put = tas_snd_vol_put,
+};
+
+#define tas_snd_mute_info	snd_ctl_boolean_stereo_info
+
+static int tas_snd_mute_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = !tas->mute_l;
+	ucontrol->value.integer.value[1] = !tas->mute_r;
+	return 0;
+}
+
+static int tas_snd_mute_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	if (tas->mute_l == !ucontrol->value.integer.value[0]
+	 && tas->mute_r == !ucontrol->value.integer.value[1])
+		return 0;
+
+	tas->mute_l = !ucontrol->value.integer.value[0];
+	tas->mute_r = !ucontrol->value.integer.value[1];
+	if (tas->hw_enabled)
+		tas_set_volume(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new mute_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Master Playback Switch",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_mute_info,
+	.get = tas_snd_mute_get,
+	.put = tas_snd_mute_put,
+};
+
+static int tas_snd_mixer_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 177;
+	return 0;
+}
+
+static int tas_snd_mixer_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+	int idx = kcontrol->private_value;
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->mixer_l[idx];
+	ucontrol->value.integer.value[1] = tas->mixer_r[idx];
+
+	return 0;
+}
+
+static int tas_snd_mixer_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+	int idx = kcontrol->private_value;
+
+	guard(mutex)(&tas->mtx);
+	if (tas->mixer_l[idx] == ucontrol->value.integer.value[0]
+	 && tas->mixer_r[idx] == ucontrol->value.integer.value[1])
+		return 0;
+
+	tas->mixer_l[idx] = ucontrol->value.integer.value[0];
+	tas->mixer_r[idx] = ucontrol->value.integer.value[1];
+
+	if (tas->hw_enabled)
+		tas_set_mixer(tas);
+	return 1;
+}
+
+#define MIXER_CONTROL(n,descr,idx)			\
+static const struct snd_kcontrol_new n##_control = {	\
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,		\
+	.name = descr " Playback Volume",		\
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,	\
+	.info = tas_snd_mixer_info,			\
+	.get = tas_snd_mixer_get,			\
+	.put = tas_snd_mixer_put,			\
+	.private_value = idx,				\
+}
+
+MIXER_CONTROL(pcm1, "PCM", 0);
+MIXER_CONTROL(monitor, "Monitor", 2);
+
+static int tas_snd_drc_range_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = TAS3004_DRC_MAX;
+	return 0;
+}
+
+static int tas_snd_drc_range_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->drc_range;
+	return 0;
+}
+
+static int tas_snd_drc_range_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	if (ucontrol->value.integer.value[0] < 0 ||
+	    ucontrol->value.integer.value[0] > TAS3004_DRC_MAX)
+		return -EINVAL;
+
+	guard(mutex)(&tas->mtx);
+	if (tas->drc_range == ucontrol->value.integer.value[0])
+		return 0;
+
+	tas->drc_range = ucontrol->value.integer.value[0];
+	if (tas->hw_enabled)
+		tas3004_set_drc(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new drc_range_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "DRC Range",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_drc_range_info,
+	.get = tas_snd_drc_range_get,
+	.put = tas_snd_drc_range_put,
+};
+
+#define tas_snd_drc_switch_info		snd_ctl_boolean_mono_info
+
+static int tas_snd_drc_switch_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->drc_enabled;
+	return 0;
+}
+
+static int tas_snd_drc_switch_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	if (tas->drc_enabled == ucontrol->value.integer.value[0])
+		return 0;
+
+	tas->drc_enabled = !!ucontrol->value.integer.value[0];
+	if (tas->hw_enabled)
+		tas3004_set_drc(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new drc_switch_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "DRC Range Switch",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_drc_switch_info,
+	.get = tas_snd_drc_switch_get,
+	.put = tas_snd_drc_switch_put,
+};
+
+static int tas_snd_capture_source_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	static const char * const texts[] = { "Line-In", "Microphone" };
+
+	return snd_ctl_enum_info(uinfo, 1, 2, texts);
+}
+
+static int tas_snd_capture_source_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.enumerated.item[0] = !!(tas->acr & TAS_ACR_INPUT_B);
+	return 0;
+}
+
+static int tas_snd_capture_source_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+	int oldacr;
+
+	if (ucontrol->value.enumerated.item[0] > 1)
+		return -EINVAL;
+	guard(mutex)(&tas->mtx);
+	oldacr = tas->acr;
+
+	/*
+	 * Despite what the data sheet says in one place, the
+	 * TAS_ACR_B_MONAUREAL bit forces mono output even when
+	 * input A (line in) is selected.
+	 */
+	tas->acr &= ~(TAS_ACR_INPUT_B | TAS_ACR_B_MONAUREAL);
+	if (ucontrol->value.enumerated.item[0])
+		tas->acr |= TAS_ACR_INPUT_B | TAS_ACR_B_MONAUREAL |
+		      TAS_ACR_B_MON_SEL_RIGHT;
+	if (oldacr == tas->acr)
+		return 0;
+	if (tas->hw_enabled)
+		tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr);
+	return 1;
+}
+
+static const struct snd_kcontrol_new capture_source_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	/* If we name this 'Input Source', it properly shows up in
+	 * alsamixer as a selection, * but it's shown under the
+	 * 'Playback' category.
+	 * If I name it 'Capture Source', it shows up in strange
+	 * ways (two bools of which one can be selected at a
+	 * time) but at least it's shown in the 'Capture'
+	 * category.
+	 * I was told that this was due to backward compatibility,
+	 * but I don't understand then why the mangling is *not*
+	 * done when I name it "Input Source".....
+	 */
+	.name = "Capture Source",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_capture_source_info,
+	.get = tas_snd_capture_source_get,
+	.put = tas_snd_capture_source_put,
+};
+
+static int tas_snd_treble_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = TAS3004_TREBLE_MIN;
+	uinfo->value.integer.max = TAS3004_TREBLE_MAX;
+	return 0;
+}
+
+static int tas_snd_treble_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->treble;
+	return 0;
+}
+
+static int tas_snd_treble_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	if (ucontrol->value.integer.value[0] < TAS3004_TREBLE_MIN ||
+	    ucontrol->value.integer.value[0] > TAS3004_TREBLE_MAX)
+		return -EINVAL;
+	guard(mutex)(&tas->mtx);
+	if (tas->treble == ucontrol->value.integer.value[0])
+		return 0;
+
+	tas->treble = ucontrol->value.integer.value[0];
+	if (tas->hw_enabled)
+		tas_set_treble(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new treble_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Treble",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_treble_info,
+	.get = tas_snd_treble_get,
+	.put = tas_snd_treble_put,
+};
+
+static int tas_snd_bass_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = TAS3004_BASS_MIN;
+	uinfo->value.integer.max = TAS3004_BASS_MAX;
+	return 0;
+}
+
+static int tas_snd_bass_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	guard(mutex)(&tas->mtx);
+	ucontrol->value.integer.value[0] = tas->bass;
+	return 0;
+}
+
+static int tas_snd_bass_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct tas *tas = snd_kcontrol_chip(kcontrol);
+
+	if (ucontrol->value.integer.value[0] < TAS3004_BASS_MIN ||
+	    ucontrol->value.integer.value[0] > TAS3004_BASS_MAX)
+		return -EINVAL;
+	guard(mutex)(&tas->mtx);
+	if (tas->bass == ucontrol->value.integer.value[0])
+		return 0;
+
+	tas->bass = ucontrol->value.integer.value[0];
+	if (tas->hw_enabled)
+		tas_set_bass(tas);
+	return 1;
+}
+
+static const struct snd_kcontrol_new bass_control = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Bass",
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.info = tas_snd_bass_info,
+	.get = tas_snd_bass_get,
+	.put = tas_snd_bass_put,
+};
+
+static struct transfer_info tas_transfers[] = {
+	{
+		/* input */
+		.formats = SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
+		.transfer_in = 1,
+	},
+	{
+		/* output */
+		.formats = SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
+		.transfer_in = 0,
+	},
+	{}
+};
+
+static int tas_usable(struct codec_info_item *cii,
+		      struct transfer_info *ti,
+		      struct transfer_info *out)
+{
+	return 1;
+}
+
+static int tas_reset_init(struct tas *tas)
+{
+	u8 tmp;
+
+	tas->codec.gpio->methods->all_amps_off(tas->codec.gpio);
+	msleep(5);
+	tas->codec.gpio->methods->set_hw_reset(tas->codec.gpio, 0);
+	msleep(5);
+	tas->codec.gpio->methods->set_hw_reset(tas->codec.gpio, 1);
+	msleep(20);
+	tas->codec.gpio->methods->set_hw_reset(tas->codec.gpio, 0);
+	msleep(10);
+	tas->codec.gpio->methods->all_amps_restore(tas->codec.gpio);
+
+	tmp = TAS_MCS_SCLK64 | TAS_MCS_SPORT_MODE_I2S | TAS_MCS_SPORT_WL_24BIT;
+	if (tas_write_reg(tas, TAS_REG_MCS, 1, &tmp))
+		goto outerr;
+
+	tas->acr |= TAS_ACR_ANALOG_PDOWN;
+	if (tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr))
+		goto outerr;
+
+	tmp = 0;
+	if (tas_write_reg(tas, TAS_REG_MCS2, 1, &tmp))
+		goto outerr;
+
+	tas3004_set_drc(tas);
+
+	/* Set treble & bass to 0dB */
+	tas->treble = TAS3004_TREBLE_ZERO;
+	tas->bass = TAS3004_BASS_ZERO;
+	tas_set_treble(tas);
+	tas_set_bass(tas);
+
+	tas->acr &= ~TAS_ACR_ANALOG_PDOWN;
+	if (tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr))
+		goto outerr;
+
+	return 0;
+ outerr:
+	return -ENODEV;
+}
+
+static int tas_switch_clock(struct codec_info_item *cii, enum clock_switch clock)
+{
+	struct tas *tas = cii->codec_data;
+
+	switch(clock) {
+	case CLOCK_SWITCH_PREPARE_SLAVE:
+		/* Clocks are going away, mute mute mute */
+		tas->codec.gpio->methods->all_amps_off(tas->codec.gpio);
+		tas->hw_enabled = 0;
+		break;
+	case CLOCK_SWITCH_SLAVE:
+		/* Clocks are back, re-init the codec */
+		scoped_guard(mutex, &tas->mtx) {
+			tas_reset_init(tas);
+			tas_set_volume(tas);
+			tas_set_mixer(tas);
+			tas->hw_enabled = 1;
+			tas->codec.gpio->methods->all_amps_restore(tas->codec.gpio);
+		}
+		break;
+	default:
+		/* doesn't happen as of now */
+		return -EINVAL;
+	}
+	return 0;
+}
+
+#ifdef CONFIG_PM
+/* we are controlled via i2c and assume that is always up
+ * If that wasn't the case, we'd have to suspend once
+ * our i2c device is suspended, and then take note of that! */
+static int tas_suspend(struct tas *tas)
+{
+	guard(mutex)(&tas->mtx);
+	tas->hw_enabled = 0;
+	tas->acr |= TAS_ACR_ANALOG_PDOWN;
+	tas_write_reg(tas, TAS_REG_ACR, 1, &tas->acr);
+	return 0;
+}
+
+static int tas_resume(struct tas *tas)
+{
+	/* reset codec */
+	guard(mutex)(&tas->mtx);
+	tas_reset_init(tas);
+	tas_set_volume(tas);
+	tas_set_mixer(tas);
+	tas->hw_enabled = 1;
+	return 0;
+}
+
+static int _tas_suspend(struct codec_info_item *cii, pm_message_t state)
+{
+	return tas_suspend(cii->codec_data);
+}
+
+static int _tas_resume(struct codec_info_item *cii)
+{
+	return tas_resume(cii->codec_data);
+}
+#else /* CONFIG_PM */
+#define _tas_suspend	NULL
+#define _tas_resume	NULL
+#endif /* CONFIG_PM */
+
+static struct codec_info tas_codec_info = {
+	.transfers = tas_transfers,
+	/* in theory, we can drive it at 512 too...
+	 * but so far the framework doesn't allow
+	 * for that and I don't see much point in it. */
+	.sysclock_factor = 256,
+	/* same here, could be 32 for just one 16 bit format */
+	.bus_factor = 64,
+	.owner = THIS_MODULE,
+	.usable = tas_usable,
+	.switch_clock = tas_switch_clock,
+	.suspend = _tas_suspend,
+	.resume = _tas_resume,
+};
+
+static int tas_init_codec(struct aoa_codec *codec)
+{
+	struct tas *tas = codec_to_tas(codec);
+	int err;
+
+	if (!tas->codec.gpio || !tas->codec.gpio->methods) {
+		printk(KERN_ERR PFX "gpios not assigned!!\n");
+		return -EINVAL;
+	}
+
+	scoped_guard(mutex, &tas->mtx) {
+		if (tas_reset_init(tas)) {
+			printk(KERN_ERR PFX "tas failed to initialise\n");
+			return -ENXIO;
+		}
+		tas->hw_enabled = 1;
+	}
+
+	if (tas->codec.soundbus_dev->attach_codec(tas->codec.soundbus_dev,
+						   aoa_get_card(),
+						   &tas_codec_info, tas)) {
+		printk(KERN_ERR PFX "error attaching tas to soundbus\n");
+		return -ENODEV;
+	}
+
+	if (aoa_snd_device_new(SNDRV_DEV_CODEC, tas, &ops)) {
+		printk(KERN_ERR PFX "failed to create tas snd device!\n");
+		return -ENODEV;
+	}
+	err = aoa_snd_ctl_add(snd_ctl_new1(&volume_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&mute_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&pcm1_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&monitor_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&capture_source_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&drc_range_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&drc_switch_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&treble_control, tas));
+	if (err)
+		goto error;
+
+	err = aoa_snd_ctl_add(snd_ctl_new1(&bass_control, tas));
+	if (err)
+		goto error;
+
+	return 0;
+ error:
+	tas->codec.soundbus_dev->detach_codec(tas->codec.soundbus_dev, tas);
+	snd_device_free(aoa_get_card(), tas);
+	return err;
+}
+
+static void tas_exit_codec(struct aoa_codec *codec)
+{
+	struct tas *tas = codec_to_tas(codec);
+
+	if (!tas->codec.soundbus_dev)
+		return;
+	tas->codec.soundbus_dev->detach_codec(tas->codec.soundbus_dev, tas);
+}
+
+
+static int tas_i2c_probe(struct i2c_client *client)
+{
+	struct device_node *node = client->dev.of_node;
+	struct tas *tas;
+
+	tas = kzalloc_obj(struct tas);
+
+	if (!tas)
+		return -ENOMEM;
+
+	mutex_init(&tas->mtx);
+	tas->i2c = client;
+	i2c_set_clientdata(client, tas);
+
+	/* seems that half is a saner default */
+	tas->drc_range = TAS3004_DRC_MAX / 2;
+
+	strscpy(tas->codec.name, "tas");
+	tas->codec.owner = THIS_MODULE;
+	tas->codec.init = tas_init_codec;
+	tas->codec.exit = tas_exit_codec;
+	tas->codec.node = of_node_get(node);
+
+	if (aoa_codec_register(&tas->codec)) {
+		goto fail;
+	}
+	printk(KERN_DEBUG
+	       "snd-aoa-codec-tas: tas found, addr 0x%02x on %pOF\n",
+	       (unsigned int)client->addr, node);
+	return 0;
+ fail:
+	mutex_destroy(&tas->mtx);
+	of_node_put(tas->codec.node);
+	kfree(tas);
+	return -EINVAL;
+}
+
+static void tas_i2c_remove(struct i2c_client *client)
+{
+	struct tas *tas = i2c_get_clientdata(client);
+	u8 tmp = TAS_ACR_ANALOG_PDOWN;
+
+	aoa_codec_unregister(&tas->codec);
+	of_node_put(tas->codec.node);
+
+	/* power down codec chip */
+	tas_write_reg(tas, TAS_REG_ACR, 1, &tmp);
+
+	mutex_destroy(&tas->mtx);
+	kfree(tas);
+}
+
+static const struct i2c_device_id tas_i2c_id[] = {
+	{ "MAC,tas3004" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c,tas_i2c_id);
+
+static struct i2c_driver tas_driver = {
+	.driver = {
+		.name = "aoa_codec_tas",
+	},
+	.probe = tas_i2c_probe,
+	.remove = tas_i2c_remove,
+	.id_table = tas_i2c_id,
+};
+
+module_i2c_driver(tas_driver);
diff --git a/sound/aoa/codecs/tas.h b/sound/aoa/codecs/tas.h
new file mode 100644
index 000000000..b3891244a
--- /dev/null
+++ b/sound/aoa/codecs/tas.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple Onboard Audio driver for tas codec (header)
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#ifndef __SND_AOA_CODECTASH
+#define __SND_AOA_CODECTASH
+
+#define TAS_REG_MCS	0x01	/* main control */
+#	define TAS_MCS_FASTLOAD		(1<<7)
+#	define TAS_MCS_SCLK64		(1<<6)
+#	define TAS_MCS_SPORT_MODE_MASK	(3<<4)
+#	define TAS_MCS_SPORT_MODE_I2S	(2<<4)
+#	define TAS_MCS_SPORT_MODE_RJ	(1<<4)
+#	define TAS_MCS_SPORT_MODE_LJ	(0<<4)
+#	define TAS_MCS_SPORT_WL_MASK	(3<<0)
+#	define TAS_MCS_SPORT_WL_16BIT	(0<<0)
+#	define TAS_MCS_SPORT_WL_18BIT	(1<<0)
+#	define TAS_MCS_SPORT_WL_20BIT	(2<<0)
+#	define TAS_MCS_SPORT_WL_24BIT	(3<<0)
+
+#define TAS_REG_DRC	0x02
+#define TAS_REG_VOL	0x04
+#define TAS_REG_TREBLE	0x05
+#define TAS_REG_BASS	0x06
+#define TAS_REG_LMIX	0x07
+#define TAS_REG_RMIX	0x08
+
+#define TAS_REG_ACR	0x40	/* analog control */
+#	define TAS_ACR_B_MONAUREAL	(1<<7)
+#	define TAS_ACR_B_MON_SEL_RIGHT	(1<<6)
+#	define TAS_ACR_DEEMPH_MASK	(3<<2)
+#	define TAS_ACR_DEEMPH_OFF	(0<<2)
+#	define TAS_ACR_DEEMPH_48KHz	(1<<2)
+#	define TAS_ACR_DEEMPH_44KHz	(2<<2)
+#	define TAS_ACR_INPUT_B		(1<<1)
+#	define TAS_ACR_ANALOG_PDOWN	(1<<0)
+
+#define TAS_REG_MCS2	0x43	/* main control 2 */
+#	define TAS_MCS2_ALLPASS		(1<<1)
+
+#define TAS_REG_LEFT_BIQUAD6	0x10
+#define TAS_REG_RIGHT_BIQUAD6	0x19
+
+#define TAS_REG_LEFT_LOUDNESS		0x21
+#define TAS_REG_RIGHT_LOUDNESS		0x22
+#define TAS_REG_LEFT_LOUDNESS_GAIN	0x23
+#define TAS_REG_RIGHT_LOUDNESS_GAIN	0x24
+
+#define TAS3001_DRC_MAX		0x5f
+#define TAS3004_DRC_MAX		0xef
+
+#endif /* __SND_AOA_CODECTASH */
diff --git a/sound/aoa/codecs/toonie.c b/sound/aoa/codecs/toonie.c
new file mode 100644
index 000000000..6aaf4c9de
--- /dev/null
+++ b/sound/aoa/codecs/toonie.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio driver for Toonie codec
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This is a driver for the toonie codec chip. This chip is present
+ * on the Mac Mini and is nothing but a DAC.
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("toonie codec driver for snd-aoa");
+
+#include "../aoa.h"
+#include "../soundbus/soundbus.h"
+
+
+#define PFX "snd-aoa-codec-toonie: "
+
+struct toonie {
+	struct aoa_codec	codec;
+};
+#define codec_to_toonie(c) container_of(c, struct toonie, codec)
+
+static int toonie_dev_register(struct snd_device *dev)
+{
+	return 0;
+}
+
+static const struct snd_device_ops ops = {
+	.dev_register = toonie_dev_register,
+};
+
+static struct transfer_info toonie_transfers[] = {
+	/* This thing *only* has analog output,
+	 * the rates are taken from Info.plist
+	 * from Darwin. */
+	{
+		.formats = SNDRV_PCM_FMTBIT_S16_BE |
+			   SNDRV_PCM_FMTBIT_S24_BE,
+		.rates = SNDRV_PCM_RATE_32000 |
+			 SNDRV_PCM_RATE_44100 |
+			 SNDRV_PCM_RATE_48000 |
+			 SNDRV_PCM_RATE_88200 |
+			 SNDRV_PCM_RATE_96000,
+	},
+	{}
+};
+
+static int toonie_usable(struct codec_info_item *cii,
+			 struct transfer_info *ti,
+			 struct transfer_info *out)
+{
+	return 1;
+}
+
+#ifdef CONFIG_PM
+static int toonie_suspend(struct codec_info_item *cii, pm_message_t state)
+{
+	/* can we turn it off somehow? */
+	return 0;
+}
+
+static int toonie_resume(struct codec_info_item *cii)
+{
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static struct codec_info toonie_codec_info = {
+	.transfers = toonie_transfers,
+	.sysclock_factor = 256,
+	.bus_factor = 64,
+	.owner = THIS_MODULE,
+	.usable = toonie_usable,
+#ifdef CONFIG_PM
+	.suspend = toonie_suspend,
+	.resume = toonie_resume,
+#endif
+};
+
+static int toonie_init_codec(struct aoa_codec *codec)
+{
+	struct toonie *toonie = codec_to_toonie(codec);
+
+	/* nothing connected? what a joke! */
+	if (toonie->codec.connected != 1)
+		return -ENOTCONN;
+
+	if (aoa_snd_device_new(SNDRV_DEV_CODEC, toonie, &ops)) {
+		printk(KERN_ERR PFX "failed to create toonie snd device!\n");
+		return -ENODEV;
+	}
+
+	if (toonie->codec.soundbus_dev->attach_codec(toonie->codec.soundbus_dev,
+						     aoa_get_card(),
+						     &toonie_codec_info, toonie)) {
+		printk(KERN_ERR PFX "error creating toonie pcm\n");
+		snd_device_free(aoa_get_card(), toonie);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void toonie_exit_codec(struct aoa_codec *codec)
+{
+	struct toonie *toonie = codec_to_toonie(codec);
+
+	if (!toonie->codec.soundbus_dev) {
+		printk(KERN_ERR PFX "toonie_exit_codec called without soundbus_dev!\n");
+		return;
+	}
+	toonie->codec.soundbus_dev->detach_codec(toonie->codec.soundbus_dev, toonie);
+}
+
+static struct toonie *toonie;
+
+static int __init toonie_init(void)
+{
+	toonie = kzalloc_obj(struct toonie);
+
+	if (!toonie)
+		return -ENOMEM;
+
+	strscpy(toonie->codec.name, "toonie");
+	toonie->codec.owner = THIS_MODULE;
+	toonie->codec.init = toonie_init_codec;
+	toonie->codec.exit = toonie_exit_codec;
+
+	if (aoa_codec_register(&toonie->codec)) {
+		kfree(toonie);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void __exit toonie_exit(void)
+{
+	aoa_codec_unregister(&toonie->codec);
+	kfree(toonie);
+}
+
+module_init(toonie_init);
+module_exit(toonie_exit);
diff --git a/sound/aoa/core/Makefile b/sound/aoa/core/Makefile
new file mode 100644
index 000000000..f586c340f
--- /dev/null
+++ b/sound/aoa/core/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_SND_AOA) += snd-aoa.o
+snd-aoa-y := core.o \
+		alsa.o \
+		gpio-pmf.o \
+		gpio-feature.o
diff --git a/sound/aoa/core/alsa.c b/sound/aoa/core/alsa.c
new file mode 100644
index 000000000..aad7dfe08
--- /dev/null
+++ b/sound/aoa/core/alsa.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio Alsa helpers
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#include <linux/module.h>
+#include "alsa.h"
+
+static int index = -1;
+module_param(index, int, 0444);
+MODULE_PARM_DESC(index, "index for AOA sound card.");
+
+static struct aoa_card *aoa_card;
+
+int aoa_alsa_init(char *name, struct module *mod, struct device *dev)
+{
+	struct snd_card *alsa_card;
+	int err;
+
+	if (aoa_card)
+		/* cannot be EEXIST due to usage in aoa_fabric_register */
+		return -EBUSY;
+
+	err = snd_card_new(dev, index, name, mod, sizeof(struct aoa_card),
+			   &alsa_card);
+	if (err < 0)
+		return err;
+	aoa_card = alsa_card->private_data;
+	aoa_card->alsa_card = alsa_card;
+	strscpy(alsa_card->driver, "AppleOnbdAudio");
+	strscpy(alsa_card->shortname, name);
+	strscpy(alsa_card->longname, name);
+	strscpy(alsa_card->mixername, name);
+	err = snd_card_register(aoa_card->alsa_card);
+	if (err < 0) {
+		printk(KERN_ERR "snd-aoa: couldn't register alsa card\n");
+		snd_card_free(aoa_card->alsa_card);
+		aoa_card = NULL;
+		return err;
+	}
+	return 0;
+}
+
+struct snd_card *aoa_get_card(void)
+{
+	if (aoa_card)
+		return aoa_card->alsa_card;
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(aoa_get_card);
+
+void aoa_alsa_cleanup(void)
+{
+	if (aoa_card) {
+		snd_card_free(aoa_card->alsa_card);
+		aoa_card = NULL;
+	}
+}
+
+int aoa_snd_device_new(enum snd_device_type type,
+		       void *device_data, const struct snd_device_ops *ops)
+{
+	struct snd_card *card = aoa_get_card();
+	int err;
+
+	if (!card) return -ENOMEM;
+
+	err = snd_device_new(card, type, device_data, ops);
+	if (err) {
+		printk(KERN_ERR "snd-aoa: failed to create snd device (%d)\n", err);
+		return err;
+	}
+	err = snd_device_register(card, device_data);
+	if (err) {
+		printk(KERN_ERR "snd-aoa: failed to register "
+				"snd device (%d)\n", err);
+		printk(KERN_ERR "snd-aoa: have you forgotten the "
+				"dev_register callback?\n");
+		snd_device_free(card, device_data);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(aoa_snd_device_new);
+
+int aoa_snd_ctl_add(struct snd_kcontrol* control)
+{
+	int err;
+
+	if (!aoa_card) return -ENODEV;
+
+	err = snd_ctl_add(aoa_card->alsa_card, control);
+	if (err)
+		printk(KERN_ERR "snd-aoa: failed to add alsa control (%d)\n",
+		       err);
+	return err;
+}
+EXPORT_SYMBOL_GPL(aoa_snd_ctl_add);
diff --git a/sound/aoa/core/alsa.h b/sound/aoa/core/alsa.h
new file mode 100644
index 000000000..8966a08c4
--- /dev/null
+++ b/sound/aoa/core/alsa.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Apple Onboard Audio Alsa private helpers
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#ifndef __SND_AOA_ALSA_H
+#define __SND_AOA_ALSA_H
+#include "../aoa.h"
+
+extern int aoa_alsa_init(char *name, struct module *mod, struct device *dev);
+extern void aoa_alsa_cleanup(void);
+
+#endif /* __SND_AOA_ALSA_H */
diff --git a/sound/aoa/core/core.c b/sound/aoa/core/core.c
new file mode 100644
index 000000000..99b032a40
--- /dev/null
+++ b/sound/aoa/core/core.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio driver core
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include "../aoa.h"
+#include "alsa.h"
+
+MODULE_DESCRIPTION("Apple Onboard Audio Sound Driver");
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+
+/* We allow only one fabric. This simplifies things,
+ * and more don't really make that much sense */
+static struct aoa_fabric *fabric;
+static LIST_HEAD(codec_list);
+
+static int attach_codec_to_fabric(struct aoa_codec *c)
+{
+	int err;
+
+	if (!try_module_get(c->owner))
+		return -EBUSY;
+	/* found_codec has to be assigned */
+	err = -ENOENT;
+	if (fabric->found_codec)
+		err = fabric->found_codec(c);
+	if (err) {
+		module_put(c->owner);
+		printk(KERN_ERR "snd-aoa: fabric didn't like codec %s\n",
+				c->name);
+		return err;
+	}
+	c->fabric = fabric;
+
+	err = 0;
+	if (c->init)
+		err = c->init(c);
+	if (err) {
+		printk(KERN_ERR "snd-aoa: codec %s didn't init\n", c->name);
+		c->fabric = NULL;
+		if (fabric->remove_codec)
+			fabric->remove_codec(c);
+		module_put(c->owner);
+		return err;
+	}
+	if (fabric->attached_codec)
+		fabric->attached_codec(c);
+	return 0;
+}
+
+int aoa_codec_register(struct aoa_codec *codec)
+{
+	int err = 0;
+
+	/* if there's a fabric already, we can tell if we
+	 * will want to have this codec, so propagate error
+	 * through. Otherwise, this will happen later... */
+	if (fabric)
+		err = attach_codec_to_fabric(codec);
+	if (!err)
+		list_add(&codec->list, &codec_list);
+	return err;
+}
+EXPORT_SYMBOL_GPL(aoa_codec_register);
+
+void aoa_codec_unregister(struct aoa_codec *codec)
+{
+	list_del(&codec->list);
+	if (codec->fabric && codec->exit)
+		codec->exit(codec);
+	if (fabric && fabric->remove_codec)
+		fabric->remove_codec(codec);
+	codec->fabric = NULL;
+	module_put(codec->owner);
+}
+EXPORT_SYMBOL_GPL(aoa_codec_unregister);
+
+int aoa_fabric_register(struct aoa_fabric *new_fabric, struct device *dev)
+{
+	struct aoa_codec *c;
+	int err;
+
+	/* allow querying for presence of fabric
+	 * (i.e. do this test first!) */
+	if (new_fabric == fabric) {
+		err = -EALREADY;
+		goto attach;
+	}
+	if (fabric)
+		return -EEXIST;
+	if (!new_fabric)
+		return -EINVAL;
+
+	err = aoa_alsa_init(new_fabric->name, new_fabric->owner, dev);
+	if (err)
+		return err;
+
+	fabric = new_fabric;
+
+ attach:
+	list_for_each_entry(c, &codec_list, list) {
+		if (c->fabric != fabric)
+			attach_codec_to_fabric(c);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_register);
+
+void aoa_fabric_unregister(struct aoa_fabric *old_fabric)
+{
+	struct aoa_codec *c;
+
+	if (fabric != old_fabric)
+		return;
+
+	list_for_each_entry(c, &codec_list, list) {
+		if (c->fabric)
+			aoa_fabric_unlink_codec(c);
+	}
+
+	aoa_alsa_cleanup();
+
+	fabric = NULL;
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_unregister);
+
+void aoa_fabric_unlink_codec(struct aoa_codec *codec)
+{
+	if (!codec->fabric) {
+		printk(KERN_ERR "snd-aoa: fabric unassigned "
+				"in aoa_fabric_unlink_codec\n");
+		dump_stack();
+		return;
+	}
+	if (codec->exit)
+		codec->exit(codec);
+	if (codec->fabric->remove_codec)
+		codec->fabric->remove_codec(codec);
+	codec->fabric = NULL;
+	module_put(codec->owner);
+}
+EXPORT_SYMBOL_GPL(aoa_fabric_unlink_codec);
+
+static int __init aoa_init(void)
+{
+	return 0;
+}
+
+static void __exit aoa_exit(void)
+{
+	aoa_alsa_cleanup();
+}
+
+module_init(aoa_init);
+module_exit(aoa_exit);
diff --git a/sound/aoa/core/gpio-feature.c b/sound/aoa/core/gpio-feature.c
new file mode 100644
index 000000000..19ed0e690
--- /dev/null
+++ b/sound/aoa/core/gpio-feature.c
@@ -0,0 +1,419 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio feature call GPIO control
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This file contains the GPIO control routines for
+ * direct (through feature calls) access to the GPIO
+ * registers.
+ */
+
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <asm/pmac_feature.h>
+#include "../aoa.h"
+
+/* TODO: these are lots of global variables
+ * that aren't used on most machines...
+ * Move them into a dynamically allocated
+ * structure and use that.
+ */
+
+/* these are the GPIO numbers (register addresses as offsets into
+ * the GPIO space) */
+static int headphone_mute_gpio;
+static int master_mute_gpio;
+static int amp_mute_gpio;
+static int lineout_mute_gpio;
+static int hw_reset_gpio;
+static int lineout_detect_gpio;
+static int headphone_detect_gpio;
+static int linein_detect_gpio;
+
+/* see the SWITCH_GPIO macro */
+static int headphone_mute_gpio_activestate;
+static int master_mute_gpio_activestate;
+static int amp_mute_gpio_activestate;
+static int lineout_mute_gpio_activestate;
+static int hw_reset_gpio_activestate;
+static int lineout_detect_gpio_activestate;
+static int headphone_detect_gpio_activestate;
+static int linein_detect_gpio_activestate;
+
+/* node pointers that we save when getting the GPIO number
+ * to get the interrupt later */
+static struct device_node *lineout_detect_node;
+static struct device_node *linein_detect_node;
+static struct device_node *headphone_detect_node;
+
+static int lineout_detect_irq;
+static int linein_detect_irq;
+static int headphone_detect_irq;
+
+static struct device_node *get_gpio(char *name,
+				    char *altname,
+				    int *gpioptr,
+				    int *gpioactiveptr)
+{
+	struct device_node *np, *gpio;
+	const u32 *reg;
+	const char *audio_gpio;
+
+	*gpioptr = -1;
+
+	/* check if we can get it the easy way ... */
+	np = of_find_node_by_name(NULL, name);
+	if (!np) {
+		/* some machines have only gpioX/extint-gpioX nodes,
+		 * and an audio-gpio property saying what it is ...
+		 * So what we have to do is enumerate all children
+		 * of the gpio node and check them all. */
+		gpio = of_find_node_by_name(NULL, "gpio");
+		if (!gpio)
+			return NULL;
+		while ((np = of_get_next_child(gpio, np))) {
+			audio_gpio = of_get_property(np, "audio-gpio", NULL);
+			if (!audio_gpio)
+				continue;
+			if (strcmp(audio_gpio, name) == 0)
+				break;
+			if (altname && (strcmp(audio_gpio, altname) == 0))
+				break;
+		}
+		of_node_put(gpio);
+		/* still not found, assume not there */
+		if (!np)
+			return NULL;
+	}
+
+	reg = of_get_property(np, "reg", NULL);
+	if (!reg) {
+		of_node_put(np);
+		return NULL;
+	}
+
+	*gpioptr = *reg;
+
+	/* this is a hack, usually the GPIOs 'reg' property
+	 * should have the offset based from the GPIO space
+	 * which is at 0x50, but apparently not always... */
+	if (*gpioptr < 0x50)
+		*gpioptr += 0x50;
+
+	reg = of_get_property(np, "audio-gpio-active-state", NULL);
+	if (!reg)
+		/* Apple seems to default to 1, but
+		 * that doesn't seem right at least on most
+		 * machines. So until proven that the opposite
+		 * is necessary, we default to 0
+		 * (which, incidentally, snd-powermac also does...) */
+		*gpioactiveptr = 0;
+	else
+		*gpioactiveptr = *reg;
+
+	return np;
+}
+
+static void get_irq(struct device_node * np, int *irqptr)
+{
+	if (np)
+		*irqptr = irq_of_parse_and_map(np, 0);
+	else
+		*irqptr = 0;
+}
+
+/* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
+#define SWITCH_GPIO(name, v, on)				\
+	(((v)&~1) | ((on)?					\
+			(name##_gpio_activestate==0?4:5):	\
+			(name##_gpio_activestate==0?5:4)))
+
+#define FTR_GPIO(name, bit)					\
+static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
+{								\
+	int v;							\
+								\
+	if (unlikely(!rt)) return;				\
+								\
+	if (name##_mute_gpio < 0)				\
+		return;						\
+								\
+	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,		\
+			      name##_mute_gpio,			\
+			      0);				\
+								\
+	/* muted = !on... */					\
+	v = SWITCH_GPIO(name##_mute, v, !on);			\
+								\
+	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,		\
+			  name##_mute_gpio, v);			\
+								\
+	rt->implementation_private &= ~(1<<bit);		\
+	rt->implementation_private |= (!!on << bit);		\
+}								\
+static int ftr_gpio_get_##name(struct gpio_runtime *rt)		\
+{								\
+	if (unlikely(!rt)) return 0;				\
+	return (rt->implementation_private>>bit)&1;		\
+}
+
+FTR_GPIO(headphone, 0);
+FTR_GPIO(amp, 1);
+FTR_GPIO(lineout, 2);
+FTR_GPIO(master, 3);
+
+static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
+{
+	int v;
+
+	if (unlikely(!rt)) return;
+	if (hw_reset_gpio < 0)
+		return;
+
+	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
+			      hw_reset_gpio, 0);
+	v = SWITCH_GPIO(hw_reset, v, on);
+	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
+			  hw_reset_gpio, v);
+}
+
+static struct gpio_methods methods;
+
+static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
+{
+	int saved;
+
+	if (unlikely(!rt)) return;
+	saved = rt->implementation_private;
+	ftr_gpio_set_headphone(rt, 0);
+	ftr_gpio_set_amp(rt, 0);
+	ftr_gpio_set_lineout(rt, 0);
+	if (methods.set_master)
+		ftr_gpio_set_master(rt, 0);
+	rt->implementation_private = saved;
+}
+
+static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
+{
+	int s;
+
+	if (unlikely(!rt)) return;
+	s = rt->implementation_private;
+	ftr_gpio_set_headphone(rt, (s>>0)&1);
+	ftr_gpio_set_amp(rt, (s>>1)&1);
+	ftr_gpio_set_lineout(rt, (s>>2)&1);
+	if (methods.set_master)
+		ftr_gpio_set_master(rt, (s>>3)&1);
+}
+
+static void ftr_handle_notify(struct work_struct *work)
+{
+	struct gpio_notification *notif =
+		container_of(work, struct gpio_notification, work.work);
+
+	guard(mutex)(&notif->mutex);
+	if (notif->notify)
+		notif->notify(notif->data);
+}
+
+static void gpio_enable_dual_edge(int gpio)
+{
+	int v;
+
+	if (gpio == -1)
+		return;
+	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
+	v |= 0x80; /* enable dual edge */
+	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
+}
+
+static void ftr_gpio_init(struct gpio_runtime *rt)
+{
+	get_gpio("headphone-mute", NULL,
+		 &headphone_mute_gpio,
+		 &headphone_mute_gpio_activestate);
+	get_gpio("amp-mute", NULL,
+		 &amp_mute_gpio,
+		 &amp_mute_gpio_activestate);
+	get_gpio("lineout-mute", NULL,
+		 &lineout_mute_gpio,
+		 &lineout_mute_gpio_activestate);
+	get_gpio("hw-reset", "audio-hw-reset",
+		 &hw_reset_gpio,
+		 &hw_reset_gpio_activestate);
+	if (get_gpio("master-mute", NULL,
+		     &master_mute_gpio,
+		     &master_mute_gpio_activestate)) {
+		methods.set_master = ftr_gpio_set_master;
+		methods.get_master = ftr_gpio_get_master;
+	}
+
+	headphone_detect_node = get_gpio("headphone-detect", NULL,
+					 &headphone_detect_gpio,
+					 &headphone_detect_gpio_activestate);
+	/* go Apple, and thanks for giving these different names
+	 * across the board... */
+	lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
+				       &lineout_detect_gpio,
+				       &lineout_detect_gpio_activestate);
+	linein_detect_node = get_gpio("linein-detect", "line-input-detect",
+				      &linein_detect_gpio,
+				      &linein_detect_gpio_activestate);
+
+	gpio_enable_dual_edge(headphone_detect_gpio);
+	gpio_enable_dual_edge(lineout_detect_gpio);
+	gpio_enable_dual_edge(linein_detect_gpio);
+
+	get_irq(headphone_detect_node, &headphone_detect_irq);
+	get_irq(lineout_detect_node, &lineout_detect_irq);
+	get_irq(linein_detect_node, &linein_detect_irq);
+
+	ftr_gpio_all_amps_off(rt);
+	rt->implementation_private = 0;
+	INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
+	INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
+	INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
+	mutex_init(&rt->headphone_notify.mutex);
+	mutex_init(&rt->line_in_notify.mutex);
+	mutex_init(&rt->line_out_notify.mutex);
+}
+
+static void ftr_gpio_exit(struct gpio_runtime *rt)
+{
+	ftr_gpio_all_amps_off(rt);
+	rt->implementation_private = 0;
+	if (rt->headphone_notify.notify)
+		free_irq(headphone_detect_irq, &rt->headphone_notify);
+	if (rt->line_in_notify.gpio_private)
+		free_irq(linein_detect_irq, &rt->line_in_notify);
+	if (rt->line_out_notify.gpio_private)
+		free_irq(lineout_detect_irq, &rt->line_out_notify);
+	cancel_delayed_work_sync(&rt->headphone_notify.work);
+	cancel_delayed_work_sync(&rt->line_in_notify.work);
+	cancel_delayed_work_sync(&rt->line_out_notify.work);
+	mutex_destroy(&rt->headphone_notify.mutex);
+	mutex_destroy(&rt->line_in_notify.mutex);
+	mutex_destroy(&rt->line_out_notify.mutex);
+}
+
+static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
+{
+	struct gpio_notification *notif = data;
+
+	schedule_delayed_work(&notif->work, 0);
+
+	return IRQ_HANDLED;
+}
+
+static int ftr_set_notify(struct gpio_runtime *rt,
+			  enum notify_type type,
+			  notify_func_t notify,
+			  void *data)
+{
+	struct gpio_notification *notif;
+	notify_func_t old;
+	int irq;
+	char *name;
+	int err = -EBUSY;
+
+	switch (type) {
+	case AOA_NOTIFY_HEADPHONE:
+		notif = &rt->headphone_notify;
+		name = "headphone-detect";
+		irq = headphone_detect_irq;
+		break;
+	case AOA_NOTIFY_LINE_IN:
+		notif = &rt->line_in_notify;
+		name = "linein-detect";
+		irq = linein_detect_irq;
+		break;
+	case AOA_NOTIFY_LINE_OUT:
+		notif = &rt->line_out_notify;
+		name = "lineout-detect";
+		irq = lineout_detect_irq;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (!irq)
+		return -ENODEV;
+
+	guard(mutex)(&notif->mutex);
+
+	old = notif->notify;
+
+	if (!old && !notify)
+		return 0;
+
+	if (old && notify) {
+		if (old == notify && notif->data == data)
+			err = 0;
+		return err;
+	}
+
+	if (old && !notify)
+		free_irq(irq, notif);
+
+	if (!old && notify) {
+		err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
+		if (err)
+			return err;
+	}
+
+	notif->notify = notify;
+	notif->data = data;
+
+	return 0;
+}
+
+static int ftr_get_detect(struct gpio_runtime *rt,
+			  enum notify_type type)
+{
+	int gpio, ret, active;
+
+	switch (type) {
+	case AOA_NOTIFY_HEADPHONE:
+		gpio = headphone_detect_gpio;
+		active = headphone_detect_gpio_activestate;
+		break;
+	case AOA_NOTIFY_LINE_IN:
+		gpio = linein_detect_gpio;
+		active = linein_detect_gpio_activestate;
+		break;
+	case AOA_NOTIFY_LINE_OUT:
+		gpio = lineout_detect_gpio;
+		active = lineout_detect_gpio_activestate;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (gpio == -1)
+		return -ENODEV;
+
+	ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
+	if (ret < 0)
+		return ret;
+	return ((ret >> 1) & 1) == active;
+}
+
+static struct gpio_methods methods = {
+	.init			= ftr_gpio_init,
+	.exit			= ftr_gpio_exit,
+	.all_amps_off		= ftr_gpio_all_amps_off,
+	.all_amps_restore	= ftr_gpio_all_amps_restore,
+	.set_headphone		= ftr_gpio_set_headphone,
+	.set_speakers		= ftr_gpio_set_amp,
+	.set_lineout		= ftr_gpio_set_lineout,
+	.set_hw_reset		= ftr_gpio_set_hw_reset,
+	.get_headphone		= ftr_gpio_get_headphone,
+	.get_speakers		= ftr_gpio_get_amp,
+	.get_lineout		= ftr_gpio_get_lineout,
+	.set_notify		= ftr_set_notify,
+	.get_detect		= ftr_get_detect,
+};
+
+struct gpio_methods *ftr_gpio_methods = &methods;
+EXPORT_SYMBOL_GPL(ftr_gpio_methods);
diff --git a/sound/aoa/core/gpio-pmf.c b/sound/aoa/core/gpio-pmf.c
new file mode 100644
index 000000000..2995876df
--- /dev/null
+++ b/sound/aoa/core/gpio-pmf.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio pmf GPIOs
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/slab.h>
+#include <asm/pmac_feature.h>
+#include <asm/pmac_pfunc.h>
+#include "../aoa.h"
+
+#define PMF_GPIO(name, bit)					\
+static void pmf_gpio_set_##name(struct gpio_runtime *rt, int on)\
+{								\
+	struct pmf_args args = { .count = 1, .u[0].v = !on };	\
+	int rc;							\
+							\
+	if (unlikely(!rt)) return;				\
+	rc = pmf_call_function(rt->node, #name "-mute", &args);	\
+	if (rc && rc != -ENODEV)				\
+		printk(KERN_WARNING "pmf_gpio_set_" #name	\
+		" failed, rc: %d\n", rc);			\
+	rt->implementation_private &= ~(1<<bit);		\
+	rt->implementation_private |= (!!on << bit);		\
+}								\
+static int pmf_gpio_get_##name(struct gpio_runtime *rt)		\
+{								\
+	if (unlikely(!rt)) return 0;				\
+	return (rt->implementation_private>>bit)&1;		\
+}
+
+PMF_GPIO(headphone, 0);
+PMF_GPIO(amp, 1);
+PMF_GPIO(lineout, 2);
+
+static void pmf_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
+{
+	struct pmf_args args = { .count = 1, .u[0].v = !!on };
+	int rc;
+
+	if (unlikely(!rt)) return;
+	rc = pmf_call_function(rt->node, "hw-reset", &args);
+	if (rc)
+		printk(KERN_WARNING "pmf_gpio_set_hw_reset"
+		       " failed, rc: %d\n", rc);
+}
+
+static void pmf_gpio_all_amps_off(struct gpio_runtime *rt)
+{
+	int saved;
+
+	if (unlikely(!rt)) return;
+	saved = rt->implementation_private;
+	pmf_gpio_set_headphone(rt, 0);
+	pmf_gpio_set_amp(rt, 0);
+	pmf_gpio_set_lineout(rt, 0);
+	rt->implementation_private = saved;
+}
+
+static void pmf_gpio_all_amps_restore(struct gpio_runtime *rt)
+{
+	int s;
+
+	if (unlikely(!rt)) return;
+	s = rt->implementation_private;
+	pmf_gpio_set_headphone(rt, (s>>0)&1);
+	pmf_gpio_set_amp(rt, (s>>1)&1);
+	pmf_gpio_set_lineout(rt, (s>>2)&1);
+}
+
+static void pmf_handle_notify(struct work_struct *work)
+{
+	struct gpio_notification *notif =
+		container_of(work, struct gpio_notification, work.work);
+
+	guard(mutex)(&notif->mutex);
+	if (notif->notify)
+		notif->notify(notif->data);
+}
+
+static void pmf_gpio_init(struct gpio_runtime *rt)
+{
+	pmf_gpio_all_amps_off(rt);
+	rt->implementation_private = 0;
+	INIT_DELAYED_WORK(&rt->headphone_notify.work, pmf_handle_notify);
+	INIT_DELAYED_WORK(&rt->line_in_notify.work, pmf_handle_notify);
+	INIT_DELAYED_WORK(&rt->line_out_notify.work, pmf_handle_notify);
+	mutex_init(&rt->headphone_notify.mutex);
+	mutex_init(&rt->line_in_notify.mutex);
+	mutex_init(&rt->line_out_notify.mutex);
+}
+
+static void pmf_gpio_exit(struct gpio_runtime *rt)
+{
+	pmf_gpio_all_amps_off(rt);
+	rt->implementation_private = 0;
+
+	if (rt->headphone_notify.gpio_private)
+		pmf_unregister_irq_client(rt->headphone_notify.gpio_private);
+	if (rt->line_in_notify.gpio_private)
+		pmf_unregister_irq_client(rt->line_in_notify.gpio_private);
+	if (rt->line_out_notify.gpio_private)
+		pmf_unregister_irq_client(rt->line_out_notify.gpio_private);
+
+	/* make sure no work is pending before freeing
+	 * all things */
+	cancel_delayed_work_sync(&rt->headphone_notify.work);
+	cancel_delayed_work_sync(&rt->line_in_notify.work);
+	cancel_delayed_work_sync(&rt->line_out_notify.work);
+
+	mutex_destroy(&rt->headphone_notify.mutex);
+	mutex_destroy(&rt->line_in_notify.mutex);
+	mutex_destroy(&rt->line_out_notify.mutex);
+
+	kfree(rt->headphone_notify.gpio_private);
+	kfree(rt->line_in_notify.gpio_private);
+	kfree(rt->line_out_notify.gpio_private);
+}
+
+static void pmf_handle_notify_irq(void *data)
+{
+	struct gpio_notification *notif = data;
+
+	schedule_delayed_work(&notif->work, 0);
+}
+
+static int pmf_set_notify(struct gpio_runtime *rt,
+			  enum notify_type type,
+			  notify_func_t notify,
+			  void *data)
+{
+	struct gpio_notification *notif;
+	notify_func_t old;
+	struct pmf_irq_client *irq_client;
+	char *name;
+	int err = -EBUSY;
+
+	switch (type) {
+	case AOA_NOTIFY_HEADPHONE:
+		notif = &rt->headphone_notify;
+		name = "headphone-detect";
+		break;
+	case AOA_NOTIFY_LINE_IN:
+		notif = &rt->line_in_notify;
+		name = "linein-detect";
+		break;
+	case AOA_NOTIFY_LINE_OUT:
+		notif = &rt->line_out_notify;
+		name = "lineout-detect";
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	guard(mutex)(&notif->mutex);
+
+	old = notif->notify;
+
+	if (!old && !notify)
+		return 0;
+
+	if (old && notify) {
+		if (old == notify && notif->data == data)
+			err = 0;
+		return err;
+	}
+
+	if (old && !notify) {
+		irq_client = notif->gpio_private;
+		pmf_unregister_irq_client(irq_client);
+		kfree(irq_client);
+		notif->gpio_private = NULL;
+	}
+	if (!old && notify) {
+		irq_client = kzalloc_obj(struct pmf_irq_client);
+		if (!irq_client)
+			return -ENOMEM;
+		irq_client->data = notif;
+		irq_client->handler = pmf_handle_notify_irq;
+		irq_client->owner = THIS_MODULE;
+		err = pmf_register_irq_client(rt->node,
+					      name,
+					      irq_client);
+		if (err) {
+			printk(KERN_ERR "snd-aoa: gpio layer failed to"
+					" register %s irq (%d)\n", name, err);
+			kfree(irq_client);
+			return err;
+		}
+		notif->gpio_private = irq_client;
+	}
+	notif->notify = notify;
+	notif->data = data;
+
+	return 0;
+}
+
+static int pmf_get_detect(struct gpio_runtime *rt,
+			  enum notify_type type)
+{
+	char *name;
+	int err = -EBUSY, ret;
+	struct pmf_args args = { .count = 1, .u[0].p = &ret };
+
+	switch (type) {
+	case AOA_NOTIFY_HEADPHONE:
+		name = "headphone-detect";
+		break;
+	case AOA_NOTIFY_LINE_IN:
+		name = "linein-detect";
+		break;
+	case AOA_NOTIFY_LINE_OUT:
+		name = "lineout-detect";
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	err = pmf_call_function(rt->node, name, &args);
+	if (err)
+		return err;
+	return ret;
+}
+
+static struct gpio_methods methods = {
+	.init			= pmf_gpio_init,
+	.exit			= pmf_gpio_exit,
+	.all_amps_off		= pmf_gpio_all_amps_off,
+	.all_amps_restore	= pmf_gpio_all_amps_restore,
+	.set_headphone		= pmf_gpio_set_headphone,
+	.set_speakers		= pmf_gpio_set_amp,
+	.set_lineout		= pmf_gpio_set_lineout,
+	.set_hw_reset		= pmf_gpio_set_hw_reset,
+	.get_headphone		= pmf_gpio_get_headphone,
+	.get_speakers		= pmf_gpio_get_amp,
+	.get_lineout		= pmf_gpio_get_lineout,
+	.set_notify		= pmf_set_notify,
+	.get_detect		= pmf_get_detect,
+};
+
+struct gpio_methods *pmf_gpio_methods = &methods;
+EXPORT_SYMBOL_GPL(pmf_gpio_methods);
diff --git a/sound/aoa/fabrics/Kconfig b/sound/aoa/fabrics/Kconfig
new file mode 100644
index 000000000..0fa2da247
--- /dev/null
+++ b/sound/aoa/fabrics/Kconfig
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SND_AOA_FABRIC_LAYOUT
+	tristate "layout-id fabric"
+	select SND_AOA_SOUNDBUS
+	select SND_AOA_SOUNDBUS_I2S
+	help
+	This enables the layout-id fabric for the Apple Onboard
+	Audio driver, the module holding it all together
+	based on the device-tree's layout-id property.
+	
+	If you are unsure and have a later Apple machine,
+	compile it as a module.
diff --git a/sound/aoa/fabrics/Makefile b/sound/aoa/fabrics/Makefile
new file mode 100644
index 000000000..2c3bee6cf
--- /dev/null
+++ b/sound/aoa/fabrics/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+snd-aoa-fabric-layout-y += layout.o
+
+obj-$(CONFIG_SND_AOA_FABRIC_LAYOUT) += snd-aoa-fabric-layout.o
diff --git a/sound/aoa/fabrics/layout.c b/sound/aoa/fabrics/layout.c
new file mode 100644
index 000000000..7bb541577
--- /dev/null
+++ b/sound/aoa/fabrics/layout.c
@@ -0,0 +1,1178 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Apple Onboard Audio driver -- layout/machine id fabric
+ *
+ * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This fabric module looks for sound codecs based on the
+ * layout-id or device-id property in the device tree.
+ */
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "../aoa.h"
+#include "../soundbus/soundbus.h"
+
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Layout-ID fabric for snd-aoa");
+
+#define MAX_CODECS_PER_BUS	2
+
+/* These are the connections the layout fabric
+ * knows about. It doesn't really care about the
+ * input ones, but I thought I'd separate them
+ * to give them proper names. The thing is that
+ * Apple usually will distinguish the active output
+ * by GPIOs, while the active input is set directly
+ * on the codec. Hence we here tell the codec what
+ * we think is connected. This information is hard-
+ * coded below ... */
+#define CC_SPEAKERS	(1<<0)
+#define CC_HEADPHONE	(1<<1)
+#define CC_LINEOUT	(1<<2)
+#define CC_DIGITALOUT	(1<<3)
+#define CC_LINEIN	(1<<4)
+#define CC_MICROPHONE	(1<<5)
+#define CC_DIGITALIN	(1<<6)
+/* pretty bogus but users complain...
+ * This is a flag saying that the LINEOUT
+ * should be renamed to HEADPHONE.
+ * be careful with input detection! */
+#define CC_LINEOUT_LABELLED_HEADPHONE	(1<<7)
+
+struct codec_connection {
+	/* CC_ flags from above */
+	int connected;
+	/* codec dependent bit to be set in the aoa_codec.connected field.
+	 * This intentionally doesn't have any generic flags because the
+	 * fabric has to know the codec anyway and all codecs might have
+	 * different connectors */
+	int codec_bit;
+};
+
+struct codec_connect_info {
+	char *name;
+	const struct codec_connection *connections;
+};
+
+#define LAYOUT_FLAG_COMBO_LINEOUT_SPDIF	(1<<0)
+
+struct layout {
+	unsigned int layout_id, device_id;
+	struct codec_connect_info codecs[MAX_CODECS_PER_BUS];
+	int flags;
+
+	/* if busname is not assigned, we use 'Master' below,
+	 * so that our layout table doesn't need to be filled
+	 * too much.
+	 * We only assign these two if we expect to find more
+	 * than one soundbus, i.e. on those machines with
+	 * multiple layout-ids */
+	char *busname;
+	int pcmid;
+};
+
+MODULE_ALIAS("sound-layout-36");
+MODULE_ALIAS("sound-layout-41");
+MODULE_ALIAS("sound-layout-45");
+MODULE_ALIAS("sound-layout-47");
+MODULE_ALIAS("sound-layout-48");
+MODULE_ALIAS("sound-layout-49");
+MODULE_ALIAS("sound-layout-50");
+MODULE_ALIAS("sound-layout-51");
+MODULE_ALIAS("sound-layout-56");
+MODULE_ALIAS("sound-layout-57");
+MODULE_ALIAS("sound-layout-58");
+MODULE_ALIAS("sound-layout-60");
+MODULE_ALIAS("sound-layout-61");
+MODULE_ALIAS("sound-layout-62");
+MODULE_ALIAS("sound-layout-64");
+MODULE_ALIAS("sound-layout-65");
+MODULE_ALIAS("sound-layout-66");
+MODULE_ALIAS("sound-layout-67");
+MODULE_ALIAS("sound-layout-68");
+MODULE_ALIAS("sound-layout-69");
+MODULE_ALIAS("sound-layout-70");
+MODULE_ALIAS("sound-layout-72");
+MODULE_ALIAS("sound-layout-76");
+MODULE_ALIAS("sound-layout-80");
+MODULE_ALIAS("sound-layout-82");
+MODULE_ALIAS("sound-layout-84");
+MODULE_ALIAS("sound-layout-86");
+MODULE_ALIAS("sound-layout-90");
+MODULE_ALIAS("sound-layout-92");
+MODULE_ALIAS("sound-layout-94");
+MODULE_ALIAS("sound-layout-96");
+MODULE_ALIAS("sound-layout-98");
+MODULE_ALIAS("sound-layout-100");
+
+MODULE_ALIAS("aoa-device-id-14");
+MODULE_ALIAS("aoa-device-id-22");
+MODULE_ALIAS("aoa-device-id-31");
+MODULE_ALIAS("aoa-device-id-35");
+MODULE_ALIAS("aoa-device-id-44");
+
+/* onyx with all but microphone connected */
+static const struct codec_connection onyx_connections_nomic[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE | CC_LINEOUT,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_DIGITALOUT,
+		.codec_bit = 1,
+	},
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* onyx on machines without headphone */
+static const struct codec_connection onyx_connections_noheadphones[] = {
+	{
+		.connected = CC_SPEAKERS | CC_LINEOUT |
+			     CC_LINEOUT_LABELLED_HEADPHONE,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_DIGITALOUT,
+		.codec_bit = 1,
+	},
+	/* FIXME: are these correct? probably not for all the machines
+	 * below ... If not this will need separating. */
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{
+		.connected = CC_MICROPHONE,
+		.codec_bit = 3,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* onyx on machines with real line-out */
+static const struct codec_connection onyx_connections_reallineout[] = {
+	{
+		.connected = CC_SPEAKERS | CC_LINEOUT | CC_HEADPHONE,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_DIGITALOUT,
+		.codec_bit = 1,
+	},
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* tas on machines without line out */
+static const struct codec_connection tas_connections_nolineout[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{
+		.connected = CC_MICROPHONE,
+		.codec_bit = 3,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* tas on machines with neither line out nor line in */
+static const struct codec_connection tas_connections_noline[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_MICROPHONE,
+		.codec_bit = 3,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* tas on machines without microphone */
+static const struct codec_connection tas_connections_nomic[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE | CC_LINEOUT,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+/* tas on machines with everything connected */
+static const struct codec_connection tas_connections_all[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE | CC_LINEOUT,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_LINEIN,
+		.codec_bit = 2,
+	},
+	{
+		.connected = CC_MICROPHONE,
+		.codec_bit = 3,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+static const struct codec_connection toonie_connections[] = {
+	{
+		.connected = CC_SPEAKERS | CC_HEADPHONE,
+		.codec_bit = 0,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+static const struct codec_connection topaz_input[] = {
+	{
+		.connected = CC_DIGITALIN,
+		.codec_bit = 0,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+static const struct codec_connection topaz_output[] = {
+	{
+		.connected = CC_DIGITALOUT,
+		.codec_bit = 1,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+static const struct codec_connection topaz_inout[] = {
+	{
+		.connected = CC_DIGITALIN,
+		.codec_bit = 0,
+	},
+	{
+		.connected = CC_DIGITALOUT,
+		.codec_bit = 1,
+	},
+	{} /* terminate array by .connected == 0 */
+};
+
+static struct layout layouts[] = {
+	/* last PowerBooks (15" Oct 2005) */
+	{ .layout_id = 82,
+	  .flags = LAYOUT_FLAG_COMBO_LINEOUT_SPDIF,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* PowerMac9,1 */
+	{ .layout_id = 60,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_reallineout,
+	  },
+	},
+	/* PowerMac9,1 */
+	{ .layout_id = 61,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* PowerBook5,7 */
+	{ .layout_id = 64,
+	  .flags = LAYOUT_FLAG_COMBO_LINEOUT_SPDIF,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	/* PowerBook5,7 */
+	{ .layout_id = 65,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* PowerBook5,9 [17" Oct 2005] */
+	{ .layout_id = 84,
+	  .flags = LAYOUT_FLAG_COMBO_LINEOUT_SPDIF,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* PowerMac8,1 */
+	{ .layout_id = 45,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* Quad PowerMac (analog in, analog/digital out) */
+	{ .layout_id = 68,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_nomic,
+	  },
+	},
+	/* Quad PowerMac (digital in) */
+	{ .layout_id = 69,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	  .busname = "digital in", .pcmid = 1 },
+	/* Early 2005 PowerBook (PowerBook 5,6) */
+	{ .layout_id = 70,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nolineout,
+	  },
+	},
+	/* PowerBook 5,4 */
+	{ .layout_id = 51,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nolineout,
+	  },
+	},
+	/* PowerBook6,1 */
+	{ .device_id = 31,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nolineout,
+	  },
+	},
+	/* PowerBook6,5 */
+	{ .device_id = 44,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_all,
+	  },
+	},
+	/* PowerBook6,7 */
+	{ .layout_id = 80,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_noline,
+	  },
+	},
+	/* PowerBook6,8 */
+	{ .layout_id = 72,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nolineout,
+	  },
+	},
+	/* PowerMac8,2 */
+	{ .layout_id = 86,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_nomic,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	/* PowerBook6,7 */
+	{ .layout_id = 92,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nolineout,
+	  },
+	},
+	/* PowerMac10,1 (Mac Mini) */
+	{ .layout_id = 58,
+	  .codecs[0] = {
+		.name = "toonie",
+		.connections = toonie_connections,
+	  },
+	},
+	{
+	  .layout_id = 96,
+	  .codecs[0] = {
+	  	.name = "onyx",
+	  	.connections = onyx_connections_noheadphones,
+	  },
+	},
+	/* unknown, untested, but this comes from Apple */
+	{ .layout_id = 41,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_all,
+	  },
+	},
+	{ .layout_id = 36,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nomic,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_inout,
+	  },
+	},
+	{ .layout_id = 47,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	{ .layout_id = 48,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	{ .layout_id = 49,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_nomic,
+	  },
+	},
+	{ .layout_id = 50,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	{ .layout_id = 56,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	{ .layout_id = 57,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	{ .layout_id = 62,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_output,
+	  },
+	},
+	{ .layout_id = 66,
+	  .codecs[0] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	{ .layout_id = 67,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	},
+	{ .layout_id = 76,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_nomic,
+	  },
+	  .codecs[1] = {
+		.name = "topaz",
+		.connections = topaz_inout,
+	  },
+	},
+	{ .layout_id = 90,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_noline,
+	  },
+	},
+	{ .layout_id = 94,
+	  .codecs[0] = {
+		.name = "onyx",
+		/* but it has an external mic?? how to select? */
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	{ .layout_id = 98,
+	  .codecs[0] = {
+		.name = "toonie",
+		.connections = toonie_connections,
+	  },
+	},
+	{ .layout_id = 100,
+	  .codecs[0] = {
+		.name = "topaz",
+		.connections = topaz_input,
+	  },
+	  .codecs[1] = {
+		.name = "onyx",
+		.connections = onyx_connections_noheadphones,
+	  },
+	},
+	/* PowerMac3,4 */
+	{ .device_id = 14,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_noline,
+	  },
+	},
+	/* PowerMac3,6 */
+	{ .device_id = 22,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_all,
+	  },
+	},
+	/* PowerBook5,2 */
+	{ .device_id = 35,
+	  .codecs[0] = {
+		.name = "tas",
+		.connections = tas_connections_all,
+	  },
+	},
+	{}
+};
+
+static struct layout *find_layout_by_id(unsigned int id)
+{
+	struct layout *l;
+
+	l = layouts;
+	while (l->codecs[0].name) {
+		if (l->layout_id == id)
+			return l;
+		l++;
+	}
+	return NULL;
+}
+
+static struct layout *find_layout_by_device(unsigned int id)
+{
+	struct layout *l;
+
+	l = layouts;
+	while (l->codecs[0].name) {
+		if (l->device_id == id)
+			return l;
+		l++;
+	}
+	return NULL;
+}
+
+static void use_layout(struct layout *l)
+{
+	int i;
+
+	for (i=0; i<MAX_CODECS_PER_BUS; i++) {
+		if (l->codecs[i].name) {
+			request_module("snd-aoa-codec-%s", l->codecs[i].name);
+		}
+	}
+	/* now we wait for the codecs to call us back */
+}
+
+struct layout_dev;
+
+struct layout_dev_ptr {
+	struct layout_dev *ptr;
+};
+
+struct layout_dev {
+	struct list_head list;
+	struct soundbus_dev *sdev;
+	struct device_node *sound;
+	struct aoa_codec *codecs[MAX_CODECS_PER_BUS];
+	struct layout *layout;
+	struct gpio_runtime gpio;
+
+	/* we need these for headphone/lineout detection */
+	struct snd_kcontrol *headphone_ctrl;
+	struct snd_kcontrol *lineout_ctrl;
+	struct snd_kcontrol *speaker_ctrl;
+	struct snd_kcontrol *master_ctrl;
+	struct snd_kcontrol *headphone_detected_ctrl;
+	struct snd_kcontrol *lineout_detected_ctrl;
+
+	struct layout_dev_ptr selfptr_headphone;
+	struct layout_dev_ptr selfptr_lineout;
+
+	u32 have_lineout_detect:1,
+	    have_headphone_detect:1,
+	    switch_on_headphone:1,
+	    switch_on_lineout:1;
+};
+
+static LIST_HEAD(layouts_list);
+static int layouts_list_items;
+/* this can go away but only if we allow multiple cards,
+ * make the fabric handle all the card stuff, etc... */
+static struct layout_dev *layout_device;
+
+#define control_info	snd_ctl_boolean_mono_info
+
+#define AMP_CONTROL(n, description)					\
+static int n##_control_get(struct snd_kcontrol *kcontrol,		\
+			   struct snd_ctl_elem_value *ucontrol)		\
+{									\
+	struct gpio_runtime *gpio = snd_kcontrol_chip(kcontrol);	\
+	if (gpio->methods && gpio->methods->get_##n)			\
+		ucontrol->value.integer.value[0] =			\
+			gpio->methods->get_##n(gpio);			\
+	return 0;							\
+}									\
+static int n##_control_put(struct snd_kcontrol *kcontrol,		\
+			   struct snd_ctl_elem_value *ucontrol)		\
+{									\
+	struct gpio_runtime *gpio = snd_kcontrol_chip(kcontrol);	\
+	if (gpio->methods && gpio->methods->set_##n)			\
+		gpio->methods->set_##n(gpio,				\
+			!!ucontrol->value.integer.value[0]);		\
+	return 1;							\
+}									\
+static const struct snd_kcontrol_new n##_ctl = {			\
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,				\
+	.name = description,						\
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,                      \
+	.info = control_info,						\
+	.get = n##_control_get,						\
+	.put = n##_control_put,						\
+}
+
+AMP_CONTROL(headphone, "Headphone Switch");
+AMP_CONTROL(speakers, "Speakers Switch");
+AMP_CONTROL(lineout, "Line-Out Switch");
+AMP_CONTROL(master, "Master Switch");
+
+static int detect_choice_get(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct layout_dev *ldev = snd_kcontrol_chip(kcontrol);
+
+	switch (kcontrol->private_value) {
+	case 0:
+		ucontrol->value.integer.value[0] = ldev->switch_on_headphone;
+		break;
+	case 1:
+		ucontrol->value.integer.value[0] = ldev->switch_on_lineout;
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int detect_choice_put(struct snd_kcontrol *kcontrol,
+			     struct snd_ctl_elem_value *ucontrol)
+{
+	struct layout_dev *ldev = snd_kcontrol_chip(kcontrol);
+
+	switch (kcontrol->private_value) {
+	case 0:
+		ldev->switch_on_headphone = !!ucontrol->value.integer.value[0];
+		break;
+	case 1:
+		ldev->switch_on_lineout = !!ucontrol->value.integer.value[0];
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 1;
+}
+
+static const struct snd_kcontrol_new headphone_detect_choice = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Headphone Detect Autoswitch",
+	.info = control_info,
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.get = detect_choice_get,
+	.put = detect_choice_put,
+	.private_value = 0,
+};
+
+static const struct snd_kcontrol_new lineout_detect_choice = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Line-Out Detect Autoswitch",
+	.info = control_info,
+	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+	.get = detect_choice_get,
+	.put = detect_choice_put,
+	.private_value = 1,
+};
+
+static int detected_get(struct snd_kcontrol *kcontrol,
+			struct snd_ctl_elem_value *ucontrol)
+{
+	struct layout_dev *ldev = snd_kcontrol_chip(kcontrol);
+	int v;
+
+	switch (kcontrol->private_value) {
+	case 0:
+		v = ldev->gpio.methods->get_detect(&ldev->gpio,
+						   AOA_NOTIFY_HEADPHONE);
+		break;
+	case 1:
+		v = ldev->gpio.methods->get_detect(&ldev->gpio,
+						   AOA_NOTIFY_LINE_OUT);
+		break;
+	default:
+		return -ENODEV;
+	}
+	ucontrol->value.integer.value[0] = v;
+	return 0;
+}
+
+static const struct snd_kcontrol_new headphone_detected = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Headphone Detected",
+	.info = control_info,
+	.access = SNDRV_CTL_ELEM_ACCESS_READ,
+	.get = detected_get,
+	.private_value = 0,
+};
+
+static const struct snd_kcontrol_new lineout_detected = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Line-Out Detected",
+	.info = control_info,
+	.access = SNDRV_CTL_ELEM_ACCESS_READ,
+	.get = detected_get,
+	.private_value = 1,
+};
+
+static int check_codec(struct aoa_codec *codec,
+		       struct layout_dev *ldev,
+		       struct codec_connect_info *cci)
+{
+	const u32 *ref;
+	char propname[32];
+	const struct codec_connection *cc;
+
+	/* if the codec has a 'codec' node, we require a reference */
+	if (of_node_name_eq(codec->node, "codec")) {
+		snprintf(propname, sizeof(propname),
+			 "platform-%s-codec-ref", codec->name);
+		ref = of_get_property(ldev->sound, propname, NULL);
+		if (!ref) {
+			printk(KERN_INFO "snd-aoa-fabric-layout: "
+				"required property %s not present\n", propname);
+			return -ENODEV;
+		}
+		if (*ref != codec->node->phandle) {
+			printk(KERN_INFO "snd-aoa-fabric-layout: "
+				"%s doesn't match!\n", propname);
+			return -ENODEV;
+		}
+	} else {
+		if (layouts_list_items != 1) {
+			printk(KERN_INFO "snd-aoa-fabric-layout: "
+				"more than one soundbus, but no references.\n");
+			return -ENODEV;
+		}
+	}
+	codec->soundbus_dev = ldev->sdev;
+	codec->gpio = &ldev->gpio;
+
+	cc = cci->connections;
+	if (!cc)
+		return -EINVAL;
+
+	printk(KERN_INFO "snd-aoa-fabric-layout: can use this codec\n");
+
+	codec->connected = 0;
+	codec->fabric_data = cc;
+
+	while (cc->connected) {
+		codec->connected |= 1<<cc->codec_bit;
+		cc++;
+	}
+
+	return 0;
+}
+
+static int layout_found_codec(struct aoa_codec *codec)
+{
+	struct layout_dev *ldev;
+	int i;
+
+	list_for_each_entry(ldev, &layouts_list, list) {
+		for (i=0; i<MAX_CODECS_PER_BUS; i++) {
+			if (!ldev->layout->codecs[i].name)
+				continue;
+			if (strcmp(ldev->layout->codecs[i].name, codec->name) == 0) {
+				if (check_codec(codec,
+						ldev,
+						&ldev->layout->codecs[i]) == 0)
+					return 0;
+			}
+		}
+	}
+	return -ENODEV;
+}
+
+static void layout_remove_codec(struct aoa_codec *codec)
+{
+	int i;
+	/* here remove the codec from the layout dev's
+	 * codec reference */
+
+	codec->soundbus_dev = NULL;
+	codec->gpio = NULL;
+	for (i=0; i<MAX_CODECS_PER_BUS; i++) {
+	}
+}
+
+static void layout_notify(void *data)
+{
+	struct layout_dev_ptr *dptr = data;
+	struct layout_dev *ldev;
+	int v, update;
+	struct snd_kcontrol *detected, *c;
+	struct snd_card *card = aoa_get_card();
+
+	ldev = dptr->ptr;
+	if (data == &ldev->selfptr_headphone) {
+		v = ldev->gpio.methods->get_detect(&ldev->gpio, AOA_NOTIFY_HEADPHONE);
+		detected = ldev->headphone_detected_ctrl;
+		update = ldev->switch_on_headphone;
+		if (update) {
+			ldev->gpio.methods->set_speakers(&ldev->gpio, !v);
+			ldev->gpio.methods->set_headphone(&ldev->gpio, v);
+			ldev->gpio.methods->set_lineout(&ldev->gpio, 0);
+		}
+	} else if (data == &ldev->selfptr_lineout) {
+		v = ldev->gpio.methods->get_detect(&ldev->gpio, AOA_NOTIFY_LINE_OUT);
+		detected = ldev->lineout_detected_ctrl;
+		update = ldev->switch_on_lineout;
+		if (update) {
+			ldev->gpio.methods->set_speakers(&ldev->gpio, !v);
+			ldev->gpio.methods->set_headphone(&ldev->gpio, 0);
+			ldev->gpio.methods->set_lineout(&ldev->gpio, v);
+		}
+	} else
+		return;
+
+	if (detected)
+		snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &detected->id);
+	if (update) {
+		c = ldev->headphone_ctrl;
+		if (c)
+			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &c->id);
+		c = ldev->speaker_ctrl;
+		if (c)
+			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &c->id);
+		c = ldev->lineout_ctrl;
+		if (c)
+			snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &c->id);
+	}
+}
+
+static void layout_attached_codec(struct aoa_codec *codec)
+{
+	const struct codec_connection *cc;
+	struct snd_kcontrol *ctl;
+	int headphones, lineout;
+	struct layout_dev *ldev = layout_device;
+
+	/* need to add this codec to our codec array! */
+
+	cc = codec->fabric_data;
+
+	headphones = codec->gpio->methods->get_detect(codec->gpio,
+						      AOA_NOTIFY_HEADPHONE);
+ 	lineout = codec->gpio->methods->get_detect(codec->gpio,
+						   AOA_NOTIFY_LINE_OUT);
+
+	if (codec->gpio->methods->set_master) {
+		ctl = snd_ctl_new1(&master_ctl, codec->gpio);
+		ldev->master_ctrl = ctl;
+		aoa_snd_ctl_add(ctl);
+	}
+	while (cc->connected) {
+		if (cc->connected & CC_SPEAKERS) {
+			if (headphones <= 0 && lineout <= 0)
+				ldev->gpio.methods->set_speakers(codec->gpio, 1);
+			ctl = snd_ctl_new1(&speakers_ctl, codec->gpio);
+			ldev->speaker_ctrl = ctl;
+			aoa_snd_ctl_add(ctl);
+		}
+		if (cc->connected & CC_HEADPHONE) {
+			if (headphones == 1)
+				ldev->gpio.methods->set_headphone(codec->gpio, 1);
+			ctl = snd_ctl_new1(&headphone_ctl, codec->gpio);
+			ldev->headphone_ctrl = ctl;
+			aoa_snd_ctl_add(ctl);
+			ldev->have_headphone_detect =
+				!ldev->gpio.methods
+					->set_notify(&ldev->gpio,
+						     AOA_NOTIFY_HEADPHONE,
+						     layout_notify,
+						     &ldev->selfptr_headphone);
+			if (ldev->have_headphone_detect) {
+				ctl = snd_ctl_new1(&headphone_detect_choice,
+						   ldev);
+				aoa_snd_ctl_add(ctl);
+				ctl = snd_ctl_new1(&headphone_detected,
+						   ldev);
+				ldev->headphone_detected_ctrl = ctl;
+				aoa_snd_ctl_add(ctl);
+			}
+		}
+		if (cc->connected & CC_LINEOUT) {
+			if (lineout == 1)
+				ldev->gpio.methods->set_lineout(codec->gpio, 1);
+			ctl = snd_ctl_new1(&lineout_ctl, codec->gpio);
+			if (!ctl)
+				return;
+			if (cc->connected & CC_LINEOUT_LABELLED_HEADPHONE)
+				strscpy(ctl->id.name, "Headphone Switch");
+			ldev->lineout_ctrl = ctl;
+			aoa_snd_ctl_add(ctl);
+			ldev->have_lineout_detect =
+				!ldev->gpio.methods
+					->set_notify(&ldev->gpio,
+						     AOA_NOTIFY_LINE_OUT,
+						     layout_notify,
+						     &ldev->selfptr_lineout);
+			if (ldev->have_lineout_detect) {
+				ctl = snd_ctl_new1(&lineout_detect_choice,
+						   ldev);
+				if (!ctl)
+					return;
+				if (cc->connected & CC_LINEOUT_LABELLED_HEADPHONE)
+					strscpy(ctl->id.name,
+						"Headphone Detect Autoswitch");
+				aoa_snd_ctl_add(ctl);
+				ctl = snd_ctl_new1(&lineout_detected,
+						   ldev);
+				if (!ctl)
+					return;
+				if (cc->connected & CC_LINEOUT_LABELLED_HEADPHONE)
+					strscpy(ctl->id.name,
+						"Headphone Detected");
+				ldev->lineout_detected_ctrl = ctl;
+				aoa_snd_ctl_add(ctl);
+			}
+		}
+		cc++;
+	}
+	/* now update initial state */
+	if (ldev->have_headphone_detect)
+		layout_notify(&ldev->selfptr_headphone);
+	if (ldev->have_lineout_detect)
+		layout_notify(&ldev->selfptr_lineout);
+}
+
+static struct aoa_fabric layout_fabric = {
+	.name = "SoundByLayout",
+	.owner = THIS_MODULE,
+	.found_codec = layout_found_codec,
+	.remove_codec = layout_remove_codec,
+	.attached_codec = layout_attached_codec,
+};
+
+static int aoa_fabric_layout_probe(struct soundbus_dev *sdev)
+{
+	struct device_node *sound = NULL;
+	const unsigned int *id;
+	struct layout *layout = NULL;
+	struct layout_dev *ldev = NULL;
+	int err;
+
+	/* hm, currently we can only have one ... */
+	if (layout_device)
+		return -ENODEV;
+
+	/* by breaking out we keep a reference */
+	for_each_child_of_node(sdev->ofdev.dev.of_node, sound) {
+		if (of_node_is_type(sound, "soundchip"))
+			break;
+	}
+	if (!sound)
+		return -ENODEV;
+
+	id = of_get_property(sound, "layout-id", NULL);
+	if (id) {
+		layout = find_layout_by_id(*id);
+	} else {
+		id = of_get_property(sound, "device-id", NULL);
+		if (id)
+			layout = find_layout_by_device(*id);
+	}
+
+	if (!layout) {
+		printk(KERN_ERR "snd-aoa-fabric-layout: unknown layout\n");
+		goto outnodev;
+	}
+
+	ldev = kzalloc_obj(struct layout_dev);
+	if (!ldev)
+		goto outnodev;
+
+	layout_device = ldev;
+	ldev->sdev = sdev;
+	ldev->sound = sound;
+	ldev->layout = layout;
+	ldev->gpio.node = sound->parent;
+	switch (layout->layout_id) {
+	case 0:  /* anything with device_id, not layout_id */
+	case 41: /* that unknown machine no one seems to have */
+	case 51: /* PowerBook5,4 */
+	case 58: /* Mac Mini */
+		ldev->gpio.methods = ftr_gpio_methods;
+		printk(KERN_DEBUG
+		       "snd-aoa-fabric-layout: Using direct GPIOs\n");
+		break;
+	default:
+		ldev->gpio.methods = pmf_gpio_methods;
+		printk(KERN_DEBUG
+		       "snd-aoa-fabric-layout: Using PMF GPIOs\n");
+	}
+	ldev->selfptr_headphone.ptr = ldev;
+	ldev->selfptr_lineout.ptr = ldev;
+	dev_set_drvdata(&sdev->ofdev.dev, ldev);
+	list_add(&ldev->list, &layouts_list);
+	layouts_list_items++;
+
+	/* assign these before registering ourselves, so
+	 * callbacks that are done during registration
+	 * already have the values */
+	sdev->pcmid = ldev->layout->pcmid;
+	if (ldev->layout->busname) {
+		sdev->pcmname = ldev->layout->busname;
+	} else {
+		sdev->pcmname = "Master";
+	}
+
+	ldev->gpio.methods->init(&ldev->gpio);
+
+	err = aoa_fabric_register(&layout_fabric, &sdev->ofdev.dev);
+	if (err && err != -EALREADY) {
+		printk(KERN_INFO "snd-aoa-fabric-layout: can't use,"
+				 " another fabric is active!\n");
+		goto outlistdel;
+	}
+
+	use_layout(layout);
+	ldev->switch_on_headphone = 1;
+	ldev->switch_on_lineout = 1;
+	return 0;
+ outlistdel:
+	/* we won't be using these then... */
+	ldev->gpio.methods->exit(&ldev->gpio);
+	/* reset if we didn't use it */
+	sdev->pcmname = NULL;
+	sdev->pcmid = -1;
+	list_del(&ldev->list);
+	layouts_list_items--;
+	kfree(ldev);
+ outnodev:
+ 	of_node_put(sound);
+ 	layout_device = NULL;
+	return -ENODEV;
+}
+
+static void aoa_fabric_layout_remove(struct soundbus_dev *sdev)
+{
+	struct layout_dev *ldev = dev_get_drvdata(&sdev->ofdev.dev);
+	int i;
+
+	for (i=0; i<MAX_CODECS_PER_BUS; i++) {
+		if (ldev->codecs[i]) {
+			aoa_fabric_unlink_codec(ldev->codecs[i]);
+		}
+		ldev->codecs[i] = NULL;
+	}
+	list_del(&ldev->list);
+	layouts_list_items--;
+	of_node_put(ldev->sound);
+
+	ldev->gpio.methods->set_notify(&ldev->gpio,
+				       AOA_NOTIFY_HEADPHONE,
+				       NULL,
+				       NULL);
+	ldev->gpio.methods->set_notify(&ldev->gpio,
+				       AOA_NOTIFY_LINE_OUT,
+				       NULL,
+				       NULL);
+
+	ldev->gpio.methods->exit(&ldev->gpio);
+	layout_device = NULL;
+	kfree(ldev);
+	sdev->pcmid = -1;
+	sdev->pcmname = NULL;
+}
+
+static int aoa_fabric_layout_suspend(struct device *dev)
+{
+	struct layout_dev *ldev = dev_get_drvdata(dev);
+
+	if (ldev->gpio.methods && ldev->gpio.methods->all_amps_off)
+		ldev->gpio.methods->all_amps_off(&ldev->gpio);
+
+	return 0;
+}
+
+static int aoa_fabric_layout_resume(struct device *dev)
+{
+	struct layout_dev *ldev = dev_get_drvdata(dev);
+
+	if (ldev->gpio.methods && ldev->gpio.methods->all_amps_restore)
+		ldev->gpio.methods->all_amps_restore(&ldev->gpio);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(aoa_fabric_layout_pm_ops,
+	aoa_fabric_layout_suspend, aoa_fabric_layout_resume);
+
+static struct soundbus_driver aoa_soundbus_driver = {
+	.name = "snd_aoa_soundbus_drv",
+	.owner = THIS_MODULE,
+	.probe = aoa_fabric_layout_probe,
+	.remove = aoa_fabric_layout_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.pm = &aoa_fabric_layout_pm_ops,
+	}
+};
+
+static int __init aoa_fabric_layout_init(void)
+{
+	return soundbus_register_driver(&aoa_soundbus_driver);
+}
+
+static void __exit aoa_fabric_layout_exit(void)
+{
+	soundbus_unregister_driver(&aoa_soundbus_driver);
+	aoa_fabric_unregister(&layout_fabric);
+}
+
+module_init(aoa_fabric_layout_init);
+module_exit(aoa_fabric_layout_exit);
diff --git a/sound/aoa/soundbus/Kconfig b/sound/aoa/soundbus/Kconfig
new file mode 100644
index 000000000..00189aac8
--- /dev/null
+++ b/sound/aoa/soundbus/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config SND_AOA_SOUNDBUS
+	tristate "Apple Soundbus support"
+	select SND_PCM
+	help
+	This option enables the generic driver for the soundbus
+	support on Apple machines.
+	
+	It is required for the sound bus implementations.
+
+config SND_AOA_SOUNDBUS_I2S
+	tristate "I2S bus support"
+	depends on SND_AOA_SOUNDBUS && PCI
+	help
+	This option enables support for Apple I2S busses.
diff --git a/sound/aoa/soundbus/Makefile b/sound/aoa/soundbus/Makefile
new file mode 100644
index 000000000..a10b102da
--- /dev/null
+++ b/sound/aoa/soundbus/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SND_AOA_SOUNDBUS) += snd-aoa-soundbus.o
+snd-aoa-soundbus-y := core.o sysfs.o
+obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += i2sbus/
diff --git a/sound/aoa/soundbus/core.c b/sound/aoa/soundbus/core.c
new file mode 100644
index 000000000..2a295f610
--- /dev/null
+++ b/sound/aoa/soundbus/core.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * soundbus
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include "soundbus.h"
+
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Apple Soundbus");
+
+struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
+{
+	struct device *tmp;
+
+	if (!dev)
+		return NULL;
+	tmp = get_device(&dev->ofdev.dev);
+	if (tmp)
+		return to_soundbus_device(tmp);
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(soundbus_dev_get);
+
+void soundbus_dev_put(struct soundbus_dev *dev)
+{
+	if (dev)
+		put_device(&dev->ofdev.dev);
+}
+EXPORT_SYMBOL_GPL(soundbus_dev_put);
+
+static int soundbus_probe(struct device *dev)
+{
+	int error = -ENODEV;
+	struct soundbus_driver *drv;
+	struct soundbus_dev *soundbus_dev;
+
+	drv = to_soundbus_driver(dev->driver);
+	soundbus_dev = to_soundbus_device(dev);
+
+	if (!drv->probe)
+		return error;
+
+	soundbus_dev_get(soundbus_dev);
+
+	error = drv->probe(soundbus_dev);
+	if (error)
+		soundbus_dev_put(soundbus_dev);
+
+	return error;
+}
+
+
+static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	const struct soundbus_dev * soundbus_dev;
+	const struct platform_device * of;
+	const char *compat;
+	int retval = 0;
+	int cplen, seen = 0;
+
+	if (!dev)
+		return -ENODEV;
+
+	soundbus_dev = to_soundbus_device(dev);
+	if (!soundbus_dev)
+		return -ENODEV;
+
+	of = &soundbus_dev->ofdev;
+
+	/* stuff we want to pass to /sbin/hotplug */
+	retval = add_uevent_var(env, "OF_NAME=%pOFn", of->dev.of_node);
+	if (retval)
+		return retval;
+
+	retval = add_uevent_var(env, "OF_TYPE=%s", of_node_get_device_type(of->dev.of_node));
+	if (retval)
+		return retval;
+
+	/* Since the compatible field can contain pretty much anything
+	 * it's not really legal to split it out with commas. We split it
+	 * up using a number of environment variables instead. */
+
+	compat = of_get_property(of->dev.of_node, "compatible", &cplen);
+	while (compat && cplen > 0) {
+		int tmp = env->buflen;
+		retval = add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
+		if (retval)
+			return retval;
+		compat += env->buflen - tmp;
+		cplen -= env->buflen - tmp;
+		seen += 1;
+	}
+
+	retval = add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
+	if (retval)
+		return retval;
+	retval = add_uevent_var(env, "MODALIAS=%s", soundbus_dev->modalias);
+
+	return retval;
+}
+
+static void soundbus_device_remove(struct device *dev)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->remove)
+		drv->remove(soundbus_dev);
+	soundbus_dev_put(soundbus_dev);
+}
+
+static void soundbus_device_shutdown(struct device *dev)
+{
+	struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
+	struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
+
+	if (dev->driver && drv->shutdown)
+		drv->shutdown(soundbus_dev);
+}
+
+/* soundbus_dev_attrs is declared in sysfs.c */
+ATTRIBUTE_GROUPS(soundbus_dev);
+static const struct bus_type soundbus_bus_type = {
+	.name		= "aoa-soundbus",
+	.probe		= soundbus_probe,
+	.uevent		= soundbus_uevent,
+	.remove		= soundbus_device_remove,
+	.shutdown	= soundbus_device_shutdown,
+	.dev_groups	= soundbus_dev_groups,
+};
+
+int soundbus_add_one(struct soundbus_dev *dev)
+{
+	static int devcount;
+
+	/* sanity checks */
+	if (!dev->attach_codec ||
+	    !dev->ofdev.dev.of_node ||
+	    dev->pcmname ||
+	    dev->pcmid != -1) {
+		printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
+		return -EINVAL;
+	}
+
+	dev_set_name(&dev->ofdev.dev, "soundbus:%x", ++devcount);
+	dev->ofdev.dev.bus = &soundbus_bus_type;
+	return of_device_register(&dev->ofdev);
+}
+EXPORT_SYMBOL_GPL(soundbus_add_one);
+
+void soundbus_remove_one(struct soundbus_dev *dev)
+{
+	of_device_unregister(&dev->ofdev);
+}
+EXPORT_SYMBOL_GPL(soundbus_remove_one);
+
+int soundbus_register_driver(struct soundbus_driver *drv)
+{
+	/* initialize common driver fields */
+	drv->driver.name = drv->name;
+	drv->driver.bus = &soundbus_bus_type;
+
+	/* register with core */
+	return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(soundbus_register_driver);
+
+void soundbus_unregister_driver(struct soundbus_driver *drv)
+{
+	driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
+
+static int __init soundbus_init(void)
+{
+	return bus_register(&soundbus_bus_type);
+}
+
+static void __exit soundbus_exit(void)
+{
+	bus_unregister(&soundbus_bus_type);
+}
+
+subsys_initcall(soundbus_init);
+module_exit(soundbus_exit);
diff --git a/sound/aoa/soundbus/i2sbus/Makefile b/sound/aoa/soundbus/i2sbus/Makefile
new file mode 100644
index 000000000..1ddaa0e17
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SND_AOA_SOUNDBUS_I2S) += snd-aoa-i2sbus.o
+snd-aoa-i2sbus-y := core.o pcm.o control.o
diff --git a/sound/aoa/soundbus/i2sbus/control.c b/sound/aoa/soundbus/i2sbus/control.c
new file mode 100644
index 000000000..1e9f258b5
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/control.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * i2sbus driver -- bus control routines
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include <asm/macio.h>
+#include <asm/pmac_feature.h>
+#include <asm/pmac_pfunc.h>
+#include <asm/keylargo.h>
+
+#include "i2sbus.h"
+
+int i2sbus_control_init(struct macio_dev* dev, struct i2sbus_control **c)
+{
+	*c = kzalloc_obj(struct i2sbus_control);
+	if (!*c)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&(*c)->list);
+
+	(*c)->macio = dev->bus->chip;
+	return 0;
+}
+
+void i2sbus_control_destroy(struct i2sbus_control *c)
+{
+	kfree(c);
+}
+
+/* this is serialised externally */
+int i2sbus_control_add_dev(struct i2sbus_control *c,
+			   struct i2sbus_dev *i2sdev)
+{
+	struct device_node *np;
+
+	np = i2sdev->sound.ofdev.dev.of_node;
+	i2sdev->enable = pmf_find_function(np, "enable");
+	i2sdev->cell_enable = pmf_find_function(np, "cell-enable");
+	i2sdev->clock_enable = pmf_find_function(np, "clock-enable");
+	i2sdev->cell_disable = pmf_find_function(np, "cell-disable");
+	i2sdev->clock_disable = pmf_find_function(np, "clock-disable");
+
+	/* if the bus number is not 0 or 1 we absolutely need to use
+	 * the platform functions -- there's nothing in Darwin that
+	 * would allow seeing a system behind what the FCRs are then,
+	 * and I don't want to go parsing a bunch of platform functions
+	 * by hand to try finding a system... */
+	if (i2sdev->bus_number != 0 && i2sdev->bus_number != 1 &&
+	    (!i2sdev->enable ||
+	     !i2sdev->cell_enable || !i2sdev->clock_enable ||
+	     !i2sdev->cell_disable || !i2sdev->clock_disable)) {
+		pmf_put_function(i2sdev->enable);
+		pmf_put_function(i2sdev->cell_enable);
+		pmf_put_function(i2sdev->clock_enable);
+		pmf_put_function(i2sdev->cell_disable);
+		pmf_put_function(i2sdev->clock_disable);
+		return -ENODEV;
+	}
+
+	list_add(&i2sdev->item, &c->list);
+
+	return 0;
+}
+
+void i2sbus_control_remove_dev(struct i2sbus_control *c,
+			       struct i2sbus_dev *i2sdev)
+{
+	/* this is serialised externally */
+	list_del(&i2sdev->item);
+	if (list_empty(&c->list))
+		i2sbus_control_destroy(c);
+}
+
+int i2sbus_control_enable(struct i2sbus_control *c,
+			  struct i2sbus_dev *i2sdev)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	if (i2sdev->enable)
+		return pmf_call_one(i2sdev->enable, &args);
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		/* these need to be locked or done through
+		 * newly created feature calls! */
+		MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_ENABLE);
+		break;
+	case 1:
+		MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_ENABLE);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
+
+int i2sbus_control_cell(struct i2sbus_control *c,
+			struct i2sbus_dev *i2sdev,
+			int enable)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	switch (enable) {
+	case 0:
+		if (i2sdev->cell_disable)
+			return pmf_call_one(i2sdev->cell_disable, &args);
+		break;
+	case 1:
+		if (i2sdev->cell_enable)
+			return pmf_call_one(i2sdev->cell_enable, &args);
+		break;
+	default:
+		printk(KERN_ERR "i2sbus: INVALID CELL ENABLE VALUE\n");
+		return -ENODEV;
+	}
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CELL_ENABLE);
+		break;
+	case 1:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CELL_ENABLE);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
+
+int i2sbus_control_clock(struct i2sbus_control *c,
+			 struct i2sbus_dev *i2sdev,
+			 int enable)
+{
+	struct pmf_args args = { .count = 0 };
+	struct macio_chip *macio = c->macio;
+
+	switch (enable) {
+	case 0:
+		if (i2sdev->clock_disable)
+			return pmf_call_one(i2sdev->clock_disable, &args);
+		break;
+	case 1:
+		if (i2sdev->clock_enable)
+			return pmf_call_one(i2sdev->clock_enable, &args);
+		break;
+	default:
+		printk(KERN_ERR "i2sbus: INVALID CLOCK ENABLE VALUE\n");
+		return -ENODEV;
+	}
+
+	if (macio == NULL || macio->base == NULL)
+		return -ENODEV;
+
+	switch (i2sdev->bus_number) {
+	case 0:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S0_CLK_ENABLE_BIT);
+		break;
+	case 1:
+		if (enable)
+			MACIO_BIS(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
+		else
+			MACIO_BIC(KEYLARGO_FCR1, KL1_I2S1_CLK_ENABLE_BIT);
+		break;
+	default:
+		return -ENODEV;
+	}
+	return 0;
+}
diff --git a/sound/aoa/soundbus/i2sbus/core.c b/sound/aoa/soundbus/i2sbus/core.c
new file mode 100644
index 000000000..833c44c0a
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/core.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * i2sbus driver
+ *
+ * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include <sound/core.h>
+
+#include <asm/macio.h>
+#include <asm/dbdma.h>
+
+#include "../soundbus.h"
+#include "i2sbus.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_DESCRIPTION("Apple Soundbus: I2S support");
+
+static int force;
+module_param(force, int, 0444);
+MODULE_PARM_DESC(force, "Force loading i2sbus even when"
+			" no layout-id property is present");
+
+static const struct of_device_id i2sbus_match[] = {
+	{ .name = "i2s" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, i2sbus_match);
+
+static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
+				       struct dbdma_command_mem *r,
+				       int numcmds)
+{
+	/* one more for rounding, one for branch back, one for stop command */
+	r->size = (numcmds + 3) * sizeof(struct dbdma_cmd);
+	/* We use the PCI APIs for now until the generic one gets fixed
+	 * enough or until we get some macio-specific versions
+	 */
+	r->space = dma_alloc_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
+				      r->size, &r->bus_addr, GFP_KERNEL);
+	if (!r->space)
+		return -ENOMEM;
+
+	r->cmds = (void*)DBDMA_ALIGN(r->space);
+	r->bus_cmd_start = r->bus_addr +
+			   (dma_addr_t)((char*)r->cmds - (char*)r->space);
+
+	return 0;
+}
+
+static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
+				       struct dbdma_command_mem *r)
+{
+	if (!r->space) return;
+
+	dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
+			    r->size, r->space, r->bus_addr);
+}
+
+static void i2sbus_release_dev(struct device *dev)
+{
+	struct i2sbus_dev *i2sdev;
+	int i;
+
+	i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
+	iounmap(i2sdev->intfregs);
+	iounmap(i2sdev->out.dbdma);
+	iounmap(i2sdev->in.dbdma);
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
+		release_and_free_resource(i2sdev->allocated_resource[i]);
+	free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
+	free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
+		free_irq(i2sdev->interrupts[i], i2sdev);
+	i2sbus_control_remove_dev(i2sdev->control, i2sdev);
+	of_node_put(i2sdev->sound.ofdev.dev.of_node);
+	mutex_destroy(&i2sdev->lock);
+	kfree(i2sdev);
+}
+
+static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
+{
+	struct i2sbus_dev *dev = devid;
+	u32 intreg;
+
+	guard(spinlock)(&dev->low_lock);
+	intreg = in_le32(&dev->intfregs->intr_ctl);
+
+	/* acknowledge interrupt reasons */
+	out_le32(&dev->intfregs->intr_ctl, intreg);
+
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * XXX FIXME: We test the layout_id's here to get the proper way of
+ * mapping in various registers, thanks to bugs in Apple device-trees.
+ * We could instead key off the machine model and the name of the i2s
+ * node (i2s-a). This we'll do when we move it all to macio_asic.c
+ * and have that export items for each sub-node too.
+ */
+static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
+				     int layout, struct resource *res)
+{
+	struct device_node *parent;
+	int pindex, rc = -ENXIO;
+	const u32 *reg;
+
+	/* Machines with layout 76 and 36 (K2 based) have a weird device
+	 * tree what we need to special case.
+	 * Normal machines just fetch the resource from the i2s-X node.
+	 * Darwin further divides normal machines into old and new layouts
+	 * with a subtely different code path but that doesn't seem necessary
+	 * in practice, they just bloated it. In addition, even on our K2
+	 * case the i2s-modem node, if we ever want to handle it, uses the
+	 * normal layout
+	 */
+	if (layout != 76 && layout != 36)
+		return of_address_to_resource(np, index, res);
+
+	parent = of_get_parent(np);
+	pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
+	rc = of_address_to_resource(parent, pindex, res);
+	if (rc)
+		goto bail;
+	reg = of_get_property(np, "reg", NULL);
+	if (reg == NULL) {
+		rc = -ENXIO;
+		goto bail;
+	}
+	res->start += reg[index * 2];
+	res->end = res->start + reg[index * 2 + 1] - 1;
+ bail:
+	of_node_put(parent);
+	return rc;
+}
+
+/* Returns 1 if added, 0 for otherwise; don't return a negative value! */
+static int i2sbus_add_dev(struct macio_dev *macio,
+			  struct i2sbus_control *control,
+			  struct device_node *np)
+{
+	struct i2sbus_dev *dev;
+	struct device_node *child, *sound = NULL;
+	struct resource *r;
+	int i, layout = 0, rlen, ok = force;
+	char node_name[8];
+	static const char *rnames[] = { "i2sbus: %pOFn (control)",
+					"i2sbus: %pOFn (tx)",
+					"i2sbus: %pOFn (rx)" };
+	static const irq_handler_t ints[] = {
+		i2sbus_bus_intr,
+		i2sbus_tx_intr,
+		i2sbus_rx_intr
+	};
+
+	if (snprintf(node_name, sizeof(node_name), "%pOFn", np) != 5)
+		return 0;
+	if (strncmp(node_name, "i2s-", 4))
+		return 0;
+
+	dev = kzalloc_obj(struct i2sbus_dev);
+	if (!dev)
+		return 0;
+
+	i = 0;
+	for_each_child_of_node(np, child) {
+		if (of_node_name_eq(child, "sound")) {
+			of_node_put(sound);
+			i++;
+			sound = of_node_get(child);
+		}
+	}
+	if (i == 1) {
+		const u32 *id = of_get_property(sound, "layout-id", NULL);
+
+		if (id) {
+			layout = *id;
+			snprintf(dev->sound.modalias, 32,
+				 "sound-layout-%d", layout);
+			ok = 1;
+		} else {
+			id = of_get_property(sound, "device-id", NULL);
+			/*
+			 * We probably cannot handle all device-id machines,
+			 * so restrict to those we do handle for now.
+			 */
+			if (id && (*id == 22 || *id == 14 || *id == 35 ||
+				   *id == 31 || *id == 44)) {
+				snprintf(dev->sound.modalias, 32,
+					 "aoa-device-id-%d", *id);
+				ok = 1;
+				layout = -1;
+			}
+		}
+	}
+	of_node_put(sound);
+	/* for the time being, until we can handle non-layout-id
+	 * things in some fabric, refuse to attach if there is no
+	 * layout-id property or we haven't been forced to attach.
+	 * When there are two i2s busses and only one has a layout-id,
+	 * then this depends on the order, but that isn't important
+	 * either as the second one in that case is just a modem. */
+	if (!ok) {
+		kfree(dev);
+		return 0;
+	}
+
+	mutex_init(&dev->lock);
+	spin_lock_init(&dev->low_lock);
+	dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
+	dev->sound.ofdev.dev.of_node = of_node_get(np);
+	dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
+	dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
+	dev->sound.ofdev.dev.release = i2sbus_release_dev;
+	dev->sound.attach_codec = i2sbus_attach_codec;
+	dev->sound.detach_codec = i2sbus_detach_codec;
+	dev->sound.pcmid = -1;
+	dev->macio = macio;
+	dev->control = control;
+	dev->bus_number = node_name[4] - 'a';
+	INIT_LIST_HEAD(&dev->sound.codec_list);
+
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		dev->interrupts[i] = -1;
+		snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
+			 rnames[i], np);
+	}
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		int irq = irq_of_parse_and_map(np, i);
+		if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
+			goto err;
+		dev->interrupts[i] = irq;
+	}
+
+
+	/* Resource handling is problematic as some device-trees contain
+	 * useless crap (ugh ugh ugh). We work around that here by calling
+	 * specific functions for calculating the appropriate resources.
+	 *
+	 * This will all be moved to macio_asic.c at one point
+	 */
+	for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
+		if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
+			goto err;
+		/* If only we could use our resource dev->resources[i]...
+		 * but request_resource doesn't know about parents and
+		 * contained resources...
+		 */
+		dev->allocated_resource[i] =
+			request_mem_region(dev->resources[i].start,
+					   resource_size(&dev->resources[i]),
+					   dev->rnames[i]);
+		if (!dev->allocated_resource[i]) {
+			printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
+			goto err;
+		}
+	}
+
+	r = &dev->resources[aoa_resource_i2smmio];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct i2s_interface_regs))
+		goto err;
+	dev->intfregs = ioremap(r->start, rlen);
+
+	r = &dev->resources[aoa_resource_txdbdma];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct dbdma_regs))
+		goto err;
+	dev->out.dbdma = ioremap(r->start, rlen);
+
+	r = &dev->resources[aoa_resource_rxdbdma];
+	rlen = resource_size(r);
+	if (rlen < sizeof(struct dbdma_regs))
+		goto err;
+	dev->in.dbdma = ioremap(r->start, rlen);
+
+	if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
+		goto err;
+
+	if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
+					MAX_DBDMA_COMMANDS))
+		goto err;
+	if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
+					MAX_DBDMA_COMMANDS))
+		goto err;
+
+	if (i2sbus_control_add_dev(dev->control, dev)) {
+		printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
+		goto err;
+	}
+
+	if (soundbus_add_one(&dev->sound)) {
+		printk(KERN_DEBUG "i2sbus: device registration error!\n");
+		if (dev->sound.ofdev.dev.kobj.state_initialized) {
+			soundbus_dev_put(&dev->sound);
+			return 0;
+		}
+		goto err;
+	}
+
+	/* enable this cell */
+	i2sbus_control_cell(dev->control, dev, 1);
+	i2sbus_control_enable(dev->control, dev);
+	i2sbus_control_clock(dev->control, dev, 1);
+
+	return 1;
+ err:
+	for (i=0;i<3;i++)
+		if (dev->interrupts[i] != -1)
+			free_irq(dev->interrupts[i], dev);
+	free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
+	free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
+	iounmap(dev->intfregs);
+	iounmap(dev->out.dbdma);
+	iounmap(dev->in.dbdma);
+	for (i=0;i<3;i++)
+		release_and_free_resource(dev->allocated_resource[i]);
+	mutex_destroy(&dev->lock);
+	of_node_put(dev->sound.ofdev.dev.of_node);
+	kfree(dev);
+	return 0;
+}
+
+static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
+{
+	struct device_node *np;
+	int got = 0, err;
+	struct i2sbus_control *control = NULL;
+
+	err = i2sbus_control_init(dev, &control);
+	if (err)
+		return err;
+	if (!control) {
+		printk(KERN_ERR "i2sbus_control_init API breakage\n");
+		return -ENODEV;
+	}
+
+	for_each_child_of_node(dev->ofdev.dev.of_node, np) {
+		if (of_device_is_compatible(np, "i2sbus") ||
+		    of_device_is_compatible(np, "i2s-modem")) {
+			got += i2sbus_add_dev(dev, control, np);
+		}
+	}
+
+	if (!got) {
+		/* found none, clean up */
+		i2sbus_control_destroy(control);
+		return -ENODEV;
+	}
+
+	dev_set_drvdata(&dev->ofdev.dev, control);
+
+	return 0;
+}
+
+static void i2sbus_remove(struct macio_dev *dev)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct i2sbus_dev *i2sdev, *tmp;
+
+	list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
+		soundbus_remove_one(&i2sdev->sound);
+}
+
+#ifdef CONFIG_PM
+static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct codec_info_item *cii;
+	struct i2sbus_dev* i2sdev;
+	int err, ret = 0;
+
+	list_for_each_entry(i2sdev, &control->list, item) {
+		/* Notify codecs */
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+			err = 0;
+			if (cii->codec->suspend)
+				err = cii->codec->suspend(cii, state);
+			if (err)
+				ret = err;
+		}
+
+		/* wait until streams are stopped */
+		i2sbus_wait_for_stop_both(i2sdev);
+	}
+
+	return ret;
+}
+
+static int i2sbus_resume(struct macio_dev* dev)
+{
+	struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
+	struct codec_info_item *cii;
+	struct i2sbus_dev* i2sdev;
+	int err, ret = 0;
+
+	list_for_each_entry(i2sdev, &control->list, item) {
+		if (list_empty(&i2sdev->sound.codec_list))
+			continue;
+
+		/* reset i2s bus format etc. */
+		i2sbus_pcm_prepare_both(i2sdev);
+
+		/* Notify codecs so they can re-initialize */
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+			err = 0;
+			if (cii->codec->resume)
+				err = cii->codec->resume(cii);
+			if (err)
+				ret = err;
+		}
+	}
+
+	return ret;
+}
+#endif /* CONFIG_PM */
+
+static int i2sbus_shutdown(struct macio_dev* dev)
+{
+	return 0;
+}
+
+static struct macio_driver i2sbus_drv = {
+	.driver = {
+		.name = "soundbus-i2s",
+		.owner = THIS_MODULE,
+		.of_match_table = i2sbus_match,
+	},
+	.probe = i2sbus_probe,
+	.remove = i2sbus_remove,
+#ifdef CONFIG_PM
+	.suspend = i2sbus_suspend,
+	.resume = i2sbus_resume,
+#endif
+	.shutdown = i2sbus_shutdown,
+};
+
+static int __init soundbus_i2sbus_init(void)
+{
+	return macio_register_driver(&i2sbus_drv);
+}
+
+static void __exit soundbus_i2sbus_exit(void)
+{
+	macio_unregister_driver(&i2sbus_drv);
+}
+
+module_init(soundbus_i2sbus_init);
+module_exit(soundbus_i2sbus_exit);
diff --git a/sound/aoa/soundbus/i2sbus/i2sbus.h b/sound/aoa/soundbus/i2sbus/i2sbus.h
new file mode 100644
index 000000000..7a3cae0d6
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/i2sbus.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * i2sbus driver -- private definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#ifndef __I2SBUS_H
+#define __I2SBUS_H
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+
+#include <sound/pcm.h>
+
+#include <asm/pmac_feature.h>
+#include <asm/dbdma.h>
+
+#include "interface.h"
+#include "../soundbus.h"
+
+struct i2sbus_control {
+	struct list_head list;
+	struct macio_chip *macio;
+};
+
+#define MAX_DBDMA_COMMANDS	32
+
+struct dbdma_command_mem {
+	dma_addr_t bus_addr;
+	dma_addr_t bus_cmd_start;
+	struct dbdma_cmd *cmds;
+	void *space;
+	int size;
+	u32 running:1;
+	u32 stopping:1;
+};
+
+struct pcm_info {
+	u32 created:1, /* has this direction been created with alsa? */
+	    active:1;  /* is this stream active? */
+	/* runtime information */
+	struct snd_pcm_substream *substream;
+	int current_period;
+	u32 frame_count;
+	struct dbdma_command_mem dbdma_ring;
+	volatile struct dbdma_regs __iomem *dbdma;
+	struct completion *stop_completion;
+};
+
+enum {
+	aoa_resource_i2smmio = 0,
+	aoa_resource_txdbdma,
+	aoa_resource_rxdbdma,
+};
+
+struct i2sbus_dev {
+	struct soundbus_dev sound;
+	struct macio_dev *macio;
+	struct i2sbus_control *control;
+	volatile struct i2s_interface_regs __iomem *intfregs;
+
+	struct resource resources[3];
+	struct resource *allocated_resource[3];
+	int interrupts[3];
+	char rnames[3][32];
+
+	/* info about currently active substreams */
+	struct pcm_info out, in;
+	snd_pcm_format_t format;
+	unsigned int rate;
+
+	/* list for a single controller */
+	struct list_head item;
+	/* number of bus on controller */
+	int bus_number;
+	/* for use by control layer */
+	struct pmf_function *enable,
+			    *cell_enable,
+			    *cell_disable,
+			    *clock_enable,
+			    *clock_disable;
+
+	/* locks */
+	/* spinlock for low-level interrupt locking */
+	spinlock_t low_lock;
+	/* mutex for high-level consistency */
+	struct mutex lock;
+};
+
+#define soundbus_dev_to_i2sbus_dev(sdev) \
+		container_of(sdev, struct i2sbus_dev, sound)
+
+/* pcm specific functions */
+extern int
+i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
+		    struct codec_info *ci, void *data);
+extern void
+i2sbus_detach_codec(struct soundbus_dev *dev, void *data);
+extern irqreturn_t
+i2sbus_tx_intr(int irq, void *devid);
+extern irqreturn_t
+i2sbus_rx_intr(int irq, void *devid);
+
+extern void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev);
+extern void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev);
+
+/* control specific functions */
+extern int i2sbus_control_init(struct macio_dev* dev,
+			       struct i2sbus_control **c);
+extern void i2sbus_control_destroy(struct i2sbus_control *c);
+extern int i2sbus_control_add_dev(struct i2sbus_control *c,
+				  struct i2sbus_dev *i2sdev);
+extern void i2sbus_control_remove_dev(struct i2sbus_control *c,
+				      struct i2sbus_dev *i2sdev);
+extern int i2sbus_control_enable(struct i2sbus_control *c,
+				 struct i2sbus_dev *i2sdev);
+extern int i2sbus_control_cell(struct i2sbus_control *c,
+			       struct i2sbus_dev *i2sdev,
+			       int enable);
+extern int i2sbus_control_clock(struct i2sbus_control *c,
+				struct i2sbus_dev *i2sdev,
+				int enable);
+#endif /* __I2SBUS_H */
diff --git a/sound/aoa/soundbus/i2sbus/interface.h b/sound/aoa/soundbus/i2sbus/interface.h
new file mode 100644
index 000000000..a13627426
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/interface.h
@@ -0,0 +1,186 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * i2sbus driver -- interface register definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#ifndef __I2SBUS_INTERFACE_H
+#define __I2SBUS_INTERFACE_H
+
+/* i2s bus control registers, at least what we know about them */
+
+#define __PAD(m,n) u8 __pad##m[n]
+#define _PAD(line, n) __PAD(line, n)
+#define PAD(n) _PAD(__LINE__, (n))
+struct i2s_interface_regs {
+	__le32 intr_ctl;	/* 0x00 */
+	PAD(12);
+	__le32 serial_format;	/* 0x10 */
+	PAD(12);
+	__le32 codec_msg_out;	/* 0x20 */
+	PAD(12);
+	__le32 codec_msg_in;	/* 0x30 */
+	PAD(12);
+	__le32 frame_count;	/* 0x40 */
+	PAD(12);
+	__le32 frame_match;	/* 0x50 */
+	PAD(12);
+	__le32 data_word_sizes;	/* 0x60 */
+	PAD(12);
+	__le32 peak_level_sel;	/* 0x70 */
+	PAD(12);
+	__le32 peak_level_in0;	/* 0x80 */
+	PAD(12);
+	__le32 peak_level_in1;	/* 0x90 */
+	PAD(12);
+	/* total size: 0x100 bytes */
+} __packed;
+
+/* interrupt register is just a bitfield with
+ * interrupt enable and pending bits */
+#define I2S_REG_INTR_CTL		0x00
+#	define I2S_INT_FRAME_COUNT		(1<<31)
+#	define I2S_PENDING_FRAME_COUNT		(1<<30)
+#	define I2S_INT_MESSAGE_FLAG		(1<<29)
+#	define I2S_PENDING_MESSAGE_FLAG		(1<<28)
+#	define I2S_INT_NEW_PEAK			(1<<27)
+#	define I2S_PENDING_NEW_PEAK		(1<<26)
+#	define I2S_INT_CLOCKS_STOPPED		(1<<25)
+#	define I2S_PENDING_CLOCKS_STOPPED	(1<<24)
+#	define I2S_INT_EXTERNAL_SYNC_ERROR	(1<<23)
+#	define I2S_PENDING_EXTERNAL_SYNC_ERROR	(1<<22)
+#	define I2S_INT_EXTERNAL_SYNC_OK		(1<<21)
+#	define I2S_PENDING_EXTERNAL_SYNC_OK	(1<<20)
+#	define I2S_INT_NEW_SAMPLE_RATE		(1<<19)
+#	define I2S_PENDING_NEW_SAMPLE_RATE	(1<<18)
+#	define I2S_INT_STATUS_FLAG		(1<<17)
+#	define I2S_PENDING_STATUS_FLAG		(1<<16)
+
+/* serial format register is more interesting :)
+ * It contains:
+ *  - clock source
+ *  - MClk divisor
+ *  - SClk divisor
+ *  - SClk master flag
+ *  - serial format (sony, i2s 64x, i2s 32x, dav, silabs)
+ *  - external sample frequency interrupt (don't understand)
+ *  - external sample frequency
+ */
+#define I2S_REG_SERIAL_FORMAT		0x10
+/* clock source. You get either 18.432, 45.1584 or 49.1520 MHz */
+#	define I2S_SF_CLOCK_SOURCE_SHIFT	30
+#	define I2S_SF_CLOCK_SOURCE_MASK		(3<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_18MHz	(0<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_45MHz	(1<<I2S_SF_CLOCK_SOURCE_SHIFT)
+#	define I2S_SF_CLOCK_SOURCE_49MHz	(2<<I2S_SF_CLOCK_SOURCE_SHIFT)
+/* also, let's define the exact clock speeds here, in Hz */
+#define I2S_CLOCK_SPEED_18MHz	18432000
+#define I2S_CLOCK_SPEED_45MHz	45158400
+#define I2S_CLOCK_SPEED_49MHz	49152000
+/* MClk is the clock that drives the codec, usually called its 'system clock'.
+ * It is derived by taking only every 'divisor' tick of the clock.
+ */
+#	define I2S_SF_MCLKDIV_SHIFT		24
+#	define I2S_SF_MCLKDIV_MASK		(0x1F<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_1			(0x14<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_3			(0x13<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_5			(0x12<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_14		(0x0E<<I2S_SF_MCLKDIV_SHIFT)
+#	define I2S_SF_MCLKDIV_OTHER(div)	(((div/2-1)<<I2S_SF_MCLKDIV_SHIFT)&I2S_SF_MCLKDIV_MASK)
+static inline int i2s_sf_mclkdiv(int div, int *out)
+{
+	int d;
+
+	switch(div) {
+	case 1: *out |= I2S_SF_MCLKDIV_1; return 0;
+	case 3: *out |= I2S_SF_MCLKDIV_3; return 0;
+	case 5: *out |= I2S_SF_MCLKDIV_5; return 0;
+	case 14: *out |= I2S_SF_MCLKDIV_14; return 0;
+	default:
+		if (div%2) return -1;
+		d = div/2-1;
+		if (d == 0x14 || d == 0x13 || d == 0x12 || d == 0x0E)
+			return -1;
+		*out |= I2S_SF_MCLKDIV_OTHER(div);
+		return 0;
+	}
+}
+/* SClk is the clock that drives the i2s wire bus. Note that it is
+ * derived from the MClk above by taking only every 'divisor' tick
+ * of MClk.
+ */
+#	define I2S_SF_SCLKDIV_SHIFT		20
+#	define I2S_SF_SCLKDIV_MASK		(0xF<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_1			(8<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_3			(9<<I2S_SF_SCLKDIV_SHIFT)
+#	define I2S_SF_SCLKDIV_OTHER(div)	(((div/2-1)<<I2S_SF_SCLKDIV_SHIFT)&I2S_SF_SCLKDIV_MASK)
+static inline int i2s_sf_sclkdiv(int div, int *out)
+{
+	int d;
+
+	switch(div) {
+	case 1: *out |= I2S_SF_SCLKDIV_1; return 0;
+	case 3: *out |= I2S_SF_SCLKDIV_3; return 0;
+	default:
+		if (div%2) return -1;
+		d = div/2-1;
+		if (d == 8 || d == 9) return -1;
+		*out |= I2S_SF_SCLKDIV_OTHER(div);
+		return 0;
+	}
+}
+#	define I2S_SF_SCLK_MASTER		(1<<19)
+/* serial format is the way the data is put to the i2s wire bus */
+#	define I2S_SF_SERIAL_FORMAT_SHIFT	16
+#	define I2S_SF_SERIAL_FORMAT_MASK	(7<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_SONY	(0<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_64X	(1<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_32X	(2<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_DAV	(4<<I2S_SF_SERIAL_FORMAT_SHIFT)
+#	define I2S_SF_SERIAL_FORMAT_I2S_SILABS	(5<<I2S_SF_SERIAL_FORMAT_SHIFT)
+/* unknown */
+#	define I2S_SF_EXT_SAMPLE_FREQ_INT_SHIFT	12
+#	define I2S_SF_EXT_SAMPLE_FREQ_INT_MASK	(0xF<<I2S_SF_SAMPLE_FREQ_INT_SHIFT)
+/* probably gives external frequency? */
+#	define I2S_SF_EXT_SAMPLE_FREQ_MASK	0xFFF
+
+/* used to send codec messages, but how isn't clear */
+#define I2S_REG_CODEC_MSG_OUT		0x20
+
+/* used to receive codec messages, but how isn't clear */
+#define I2S_REG_CODEC_MSG_IN		0x30
+
+/* frame count reg isn't clear to me yet, but probably useful */
+#define I2S_REG_FRAME_COUNT		0x40
+
+/* program to some value, and get interrupt if frame count reaches it */
+#define I2S_REG_FRAME_MATCH		0x50
+
+/* this register describes how the bus transfers data */
+#define I2S_REG_DATA_WORD_SIZES		0x60
+/* number of interleaved input channels */
+#	define I2S_DWS_NUM_CHANNELS_IN_SHIFT	24
+#	define I2S_DWS_NUM_CHANNELS_IN_MASK	(0x1F<<I2S_DWS_NUM_CHANNELS_IN_SHIFT)
+/* word size of input data */
+#	define I2S_DWS_DATA_IN_SIZE_SHIFT	16
+#	define I2S_DWS_DATA_IN_16BIT		(0<<I2S_DWS_DATA_IN_SIZE_SHIFT)
+#	define I2S_DWS_DATA_IN_24BIT		(3<<I2S_DWS_DATA_IN_SIZE_SHIFT)
+/* number of interleaved output channels */
+#	define I2S_DWS_NUM_CHANNELS_OUT_SHIFT	8
+#	define I2S_DWS_NUM_CHANNELS_OUT_MASK	(0x1F<<I2S_DWS_NUM_CHANNELS_OUT_SHIFT)
+/* word size of output data */
+#	define I2S_DWS_DATA_OUT_SIZE_SHIFT	0
+#	define I2S_DWS_DATA_OUT_16BIT		(0<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
+#	define I2S_DWS_DATA_OUT_24BIT		(3<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
+
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_SEL		0x70
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_IN0		0x80
+
+/* unknown */
+#define I2S_REG_PEAK_LEVEL_IN1		0x90
+
+#endif /* __I2SBUS_INTERFACE_H */
diff --git a/sound/aoa/soundbus/i2sbus/pcm.c b/sound/aoa/soundbus/i2sbus/pcm.c
new file mode 100644
index 000000000..63004ece9
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/pcm.c
@@ -0,0 +1,1041 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * i2sbus driver -- pcm routines
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <asm/macio.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include "../soundbus.h"
+#include "i2sbus.h"
+
+static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
+				struct pcm_info **pi, struct pcm_info **other)
+{
+	if (in) {
+		if (pi)
+			*pi = &i2sdev->in;
+		if (other)
+			*other = &i2sdev->out;
+	} else {
+		if (pi)
+			*pi = &i2sdev->out;
+		if (other)
+			*other = &i2sdev->in;
+	}
+}
+
+static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
+{
+	/* sclk must be derived from mclk! */
+	if (mclk % sclk)
+		return -1;
+	/* derive sclk register value */
+	if (i2s_sf_sclkdiv(mclk / sclk, out))
+		return -1;
+
+	if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
+		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
+			*out |= I2S_SF_CLOCK_SOURCE_18MHz;
+			return 0;
+		}
+	}
+	if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
+		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
+			*out |= I2S_SF_CLOCK_SOURCE_45MHz;
+			return 0;
+		}
+	}
+	if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
+		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
+			*out |= I2S_SF_CLOCK_SOURCE_49MHz;
+			return 0;
+		}
+	}
+	return -1;
+}
+
+#define CHECK_RATE(rate)						\
+	do { if (rates & SNDRV_PCM_RATE_ ##rate) {			\
+		int dummy;						\
+		if (clock_and_divisors(sysclock_factor,			\
+				       bus_factor, rate, &dummy))	\
+			rates &= ~SNDRV_PCM_RATE_ ##rate;		\
+	} } while (0)
+
+static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
+{
+	struct pcm_info *pi, *other;
+	struct soundbus_dev *sdev;
+	int masks_inited = 0, err;
+	struct codec_info_item *cii, *rev;
+	struct snd_pcm_hardware *hw;
+	u64 formats = 0;
+	unsigned int rates = 0;
+	struct transfer_info v;
+	int bus_factor = 0, sysclock_factor = 0;
+	int found_this;
+
+	guard(mutex)(&i2sdev->lock);
+
+	get_pcm_info(i2sdev, in, &pi, &other);
+
+	hw = &pi->substream->runtime->hw;
+	sdev = &i2sdev->sound;
+
+	if (pi->active) {
+		/* alsa messed up */
+		return -EBUSY;
+	}
+
+	/* we now need to assign the hw */
+	list_for_each_entry(cii, &sdev->codec_list, list) {
+		struct transfer_info *ti = cii->codec->transfers;
+		bus_factor = cii->codec->bus_factor;
+		sysclock_factor = cii->codec->sysclock_factor;
+		while (ti->formats && ti->rates) {
+			v = *ti;
+			if (ti->transfer_in == in
+			    && cii->codec->usable(cii, ti, &v)) {
+				if (masks_inited) {
+					formats &= v.formats;
+					rates &= v.rates;
+				} else {
+					formats = v.formats;
+					rates = v.rates;
+					masks_inited = 1;
+				}
+			}
+			ti++;
+		}
+	}
+	if (!masks_inited || !bus_factor || !sysclock_factor)
+		return -ENODEV;
+	/* bus dependent stuff */
+	hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+		   SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
+		   SNDRV_PCM_INFO_JOINT_DUPLEX;
+
+	CHECK_RATE(5512);
+	CHECK_RATE(8000);
+	CHECK_RATE(11025);
+	CHECK_RATE(16000);
+	CHECK_RATE(22050);
+	CHECK_RATE(32000);
+	CHECK_RATE(44100);
+	CHECK_RATE(48000);
+	CHECK_RATE(64000);
+	CHECK_RATE(88200);
+	CHECK_RATE(96000);
+	CHECK_RATE(176400);
+	CHECK_RATE(192000);
+	hw->rates = rates;
+
+	/* well. the codec might want 24 bits only, and we'll
+	 * ever only transfer 24 bits, but they are top-aligned!
+	 * So for alsa, we claim that we're doing full 32 bit
+	 * while in reality we'll ignore the lower 8 bits of
+	 * that when doing playback (they're transferred as 0
+	 * as far as I know, no codecs we have are 32-bit capable
+	 * so I can't really test) and when doing recording we'll
+	 * always have those lower 8 bits recorded as 0 */
+	if (formats & SNDRV_PCM_FMTBIT_S24_BE)
+		formats |= SNDRV_PCM_FMTBIT_S32_BE;
+	if (formats & SNDRV_PCM_FMTBIT_U24_BE)
+		formats |= SNDRV_PCM_FMTBIT_U32_BE;
+	/* now mask off what we can support. I suppose we could
+	 * also support S24_3LE and some similar formats, but I
+	 * doubt there's a codec that would be able to use that,
+	 * so we don't support it here. */
+	hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
+				 SNDRV_PCM_FMTBIT_U16_BE |
+				 SNDRV_PCM_FMTBIT_S32_BE |
+				 SNDRV_PCM_FMTBIT_U32_BE);
+
+	/* we need to set the highest and lowest rate possible.
+	 * These are the highest and lowest rates alsa can
+	 * support properly in its bitfield.
+	 * Below, we'll use that to restrict to the rate
+	 * currently in use (if any). */
+	hw->rate_min = 5512;
+	hw->rate_max = 192000;
+	/* If the other stream is already prepared, keep this stream
+	 * on the same duplex format and rate.
+	 *
+	 * i2sbus_pcm_prepare() still programs one shared transport
+	 * configuration for both directions, so mixed duplex formats
+	 * are not supported here.
+	 */
+	if (other->active) {
+		hw->formats &= pcm_format_to_bits(i2sdev->format);
+		/* Restrict rates to the one already in use. */
+		hw->rate_min = i2sdev->rate;
+		hw->rate_max = i2sdev->rate;
+	}
+
+	hw->channels_min = 2;
+	hw->channels_max = 2;
+	/* these are somewhat arbitrary */
+	hw->buffer_bytes_max = 131072;
+	hw->period_bytes_min = 256;
+	hw->period_bytes_max = 16384;
+	hw->periods_min = 3;
+	hw->periods_max = MAX_DBDMA_COMMANDS;
+	err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (err < 0)
+		return err;
+	list_for_each_entry(cii, &sdev->codec_list, list) {
+		if (cii->codec->open) {
+			err = cii->codec->open(cii, pi->substream);
+			if (err) {
+				/* unwind */
+				found_this = 0;
+				list_for_each_entry_reverse(rev,
+				    &sdev->codec_list, list) {
+					if (found_this && rev->codec->close) {
+						rev->codec->close(rev,
+								pi->substream);
+					}
+					if (rev == cii)
+						found_this = 1;
+				}
+				return err;
+			}
+		}
+	}
+
+	return 0;
+}
+
+#undef CHECK_RATE
+
+static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
+{
+	struct codec_info_item *cii;
+	struct pcm_info *pi;
+	int err = 0, tmp;
+
+	guard(mutex)(&i2sdev->lock);
+
+	get_pcm_info(i2sdev, in, &pi, NULL);
+
+	list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+		if (cii->codec->close) {
+			tmp = cii->codec->close(cii, pi->substream);
+			if (tmp)
+				err = tmp;
+		}
+	}
+
+	pi->substream = NULL;
+	pi->active = 0;
+	return err;
+}
+
+static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
+				 struct pcm_info *pi)
+{
+	unsigned long flags;
+	DECLARE_COMPLETION_ONSTACK(done);
+	unsigned long time_left;
+
+	spin_lock_irqsave(&i2sdev->low_lock, flags);
+	if (pi->dbdma_ring.stopping) {
+		pi->stop_completion = &done;
+		spin_unlock_irqrestore(&i2sdev->low_lock, flags);
+		time_left = wait_for_completion_timeout(&done, HZ);
+		spin_lock_irqsave(&i2sdev->low_lock, flags);
+		pi->stop_completion = NULL;
+		if (time_left == 0) {
+			/* timeout expired, stop dbdma forcefully */
+			printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
+			/* make sure RUN, PAUSE and S0 bits are cleared */
+			out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
+			pi->dbdma_ring.stopping = 0;
+			time_left = 10;
+			while (in_le32(&pi->dbdma->status) & ACTIVE) {
+				if (--time_left <= 0)
+					break;
+				udelay(1);
+			}
+		}
+	}
+	spin_unlock_irqrestore(&i2sdev->low_lock, flags);
+}
+
+#ifdef CONFIG_PM
+void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
+{
+	struct pcm_info *pi;
+
+	get_pcm_info(i2sdev, 0, &pi, NULL);
+	i2sbus_wait_for_stop(i2sdev, pi);
+	get_pcm_info(i2sdev, 1, &pi, NULL);
+	i2sbus_wait_for_stop(i2sdev, pi);
+}
+#endif
+
+static void i2sbus_pcm_clear_active(struct i2sbus_dev *i2sdev, int in)
+{
+	struct pcm_info *pi;
+
+	guard(mutex)(&i2sdev->lock);
+
+	get_pcm_info(i2sdev, in, &pi, NULL);
+	pi->active = 0;
+}
+
+static inline int i2sbus_hw_params(struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *params, int in)
+{
+	i2sbus_pcm_clear_active(snd_pcm_substream_chip(substream), in);
+	return 0;
+}
+
+static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+	struct pcm_info *pi;
+
+	get_pcm_info(i2sdev, in, &pi, NULL);
+	if (pi->dbdma_ring.stopping)
+		i2sbus_wait_for_stop(i2sdev, pi);
+	i2sbus_pcm_clear_active(i2sdev, in);
+	return 0;
+}
+
+static int i2sbus_playback_hw_params(struct snd_pcm_substream *substream,
+				     struct snd_pcm_hw_params *params)
+{
+	return i2sbus_hw_params(substream, params, 0);
+}
+
+static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
+{
+	return i2sbus_hw_free(substream, 0);
+}
+
+static int i2sbus_record_hw_params(struct snd_pcm_substream *substream,
+				   struct snd_pcm_hw_params *params)
+{
+	return i2sbus_hw_params(substream, params, 1);
+}
+
+static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
+{
+	return i2sbus_hw_free(substream, 1);
+}
+
+static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
+{
+	/* whee. Hard work now. The user has selected a bitrate
+	 * and bit format, so now we have to program our
+	 * I2S controller appropriately. */
+	struct snd_pcm_runtime *runtime;
+	struct dbdma_cmd *command;
+	int i, periodsize, nperiods;
+	dma_addr_t offset;
+	struct bus_info bi;
+	struct codec_info_item *cii;
+	int sfr = 0;		/* serial format register */
+	int dws = 0;		/* data word sizes reg */
+	int input_16bit;
+	struct pcm_info *pi, *other;
+	int cnt;
+	unsigned int cmd, stopaddr;
+
+	guard(mutex)(&i2sdev->lock);
+
+	get_pcm_info(i2sdev, in, &pi, &other);
+
+	if (pi->dbdma_ring.running)
+		return -EBUSY;
+	if (pi->dbdma_ring.stopping)
+		i2sbus_wait_for_stop(i2sdev, pi);
+
+	if (!pi->substream || !pi->substream->runtime)
+		return -EINVAL;
+
+	runtime = pi->substream->runtime;
+	if (other->active &&
+	    ((i2sdev->format != runtime->format)
+	     || (i2sdev->rate != runtime->rate)))
+		return -EINVAL;
+
+	i2sdev->format = runtime->format;
+	i2sdev->rate = runtime->rate;
+
+	periodsize = snd_pcm_lib_period_bytes(pi->substream);
+	nperiods = pi->substream->runtime->periods;
+	pi->current_period = 0;
+
+	/* generate dbdma command ring first */
+	command = pi->dbdma_ring.cmds;
+	memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));
+
+	/* commands to DMA to/from the ring */
+	/*
+	 * For input, we need to do a graceful stop; if we abort
+	 * the DMA, we end up with leftover bytes that corrupt
+	 * the next recording.  To do this we set the S0 status
+	 * bit and wait for the DMA controller to stop.  Each
+	 * command has a branch condition to
+	 * make it branch to a stop command if S0 is set.
+	 * On input we also need to wait for the S7 bit to be
+	 * set before turning off the DMA controller.
+	 * In fact we do the graceful stop for output as well.
+	 */
+	offset = runtime->dma_addr;
+	cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
+	stopaddr = pi->dbdma_ring.bus_cmd_start +
+		(nperiods + 1) * sizeof(struct dbdma_cmd);
+	for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
+		command->command = cpu_to_le16(cmd);
+		command->cmd_dep = cpu_to_le32(stopaddr);
+		command->phy_addr = cpu_to_le32(offset);
+		command->req_count = cpu_to_le16(periodsize);
+	}
+
+	/* branch back to beginning of ring */
+	command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
+	command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
+	command++;
+
+	/* set stop command */
+	command->command = cpu_to_le16(DBDMA_STOP);
+
+	cii = list_first_entry(&i2sdev->sound.codec_list,
+			       struct codec_info_item, list);
+
+	/* ok, let's set the serial format and stuff */
+	switch (runtime->format) {
+	/* 16 bit formats */
+	case SNDRV_PCM_FORMAT_S16_BE:
+	case SNDRV_PCM_FORMAT_U16_BE:
+		/* FIXME: if we add different bus factors we need to
+		 * do more here!! */
+		bi.bus_factor = cii->codec->bus_factor;
+		input_16bit = 1;
+		break;
+	case SNDRV_PCM_FORMAT_S32_BE:
+	case SNDRV_PCM_FORMAT_U32_BE:
+		/* force 64x bus speed, otherwise the data cannot be
+		 * transferred quickly enough! */
+		bi.bus_factor = 64;
+		input_16bit = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+	/* we assume all sysclocks are the same! */
+	bi.sysclock_factor = cii->codec->sysclock_factor;
+
+	if (clock_and_divisors(bi.sysclock_factor,
+			       bi.bus_factor,
+			       runtime->rate,
+			       &sfr) < 0)
+		return -EINVAL;
+	switch (bi.bus_factor) {
+	case 32:
+		sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
+		break;
+	case 64:
+		sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
+		break;
+	}
+	/* FIXME: THIS ASSUMES MASTER ALL THE TIME */
+	sfr |= I2S_SF_SCLK_MASTER;
+
+	list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
+		int err = 0;
+		if (cii->codec->prepare)
+			err = cii->codec->prepare(cii, &bi, pi->substream);
+		if (err)
+			return err;
+	}
+	/* codecs are fine with it, so set our clocks */
+	if (input_16bit)
+		dws =	(2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
+			(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
+			I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
+	else
+		dws =	(2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
+			(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
+			I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
+
+	/* early exit if already programmed correctly */
+	/* not locking these is fine since we touch them only in this function */
+	if (in_le32(&i2sdev->intfregs->serial_format) == sfr &&
+	    in_le32(&i2sdev->intfregs->data_word_sizes) == dws) {
+		pi->active = 1;
+		return 0;
+	}
+
+	/* let's notify the codecs about clocks going away.
+	 * For now we only do mastering on the i2s cell... */
+	list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
+		if (cii->codec->switch_clock)
+			cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
+
+	i2sbus_control_enable(i2sdev->control, i2sdev);
+	i2sbus_control_cell(i2sdev->control, i2sdev, 1);
+
+	out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
+
+	i2sbus_control_clock(i2sdev->control, i2sdev, 0);
+
+	msleep(1);
+
+	/* wait for clock stopped. This can apparently take a while... */
+	cnt = 100;
+	while (cnt-- &&
+	    !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
+		msleep(5);
+	}
+	out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
+
+	/* not locking these is fine since we touch them only in this function */
+	out_le32(&i2sdev->intfregs->serial_format, sfr);
+	out_le32(&i2sdev->intfregs->data_word_sizes, dws);
+
+        i2sbus_control_enable(i2sdev->control, i2sdev);
+        i2sbus_control_cell(i2sdev->control, i2sdev, 1);
+        i2sbus_control_clock(i2sdev->control, i2sdev, 1);
+	msleep(1);
+
+	list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
+		if (cii->codec->switch_clock)
+			cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
+
+	pi->active = 1;
+	return 0;
+}
+
+#ifdef CONFIG_PM
+void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
+{
+	i2sbus_pcm_prepare(i2sdev, 0);
+	i2sbus_pcm_prepare(i2sdev, 1);
+}
+#endif
+
+static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
+{
+	struct codec_info_item *cii;
+	struct pcm_info *pi;
+
+	guard(spinlock_irqsave)(&i2sdev->low_lock);
+
+	get_pcm_info(i2sdev, in, &pi, NULL);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		if (pi->dbdma_ring.running)
+			return -EALREADY;
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
+			if (cii->codec->start)
+				cii->codec->start(cii, pi->substream);
+		pi->dbdma_ring.running = 1;
+
+		if (pi->dbdma_ring.stopping) {
+			/* Clear the S0 bit, then see if we stopped yet */
+			out_le32(&pi->dbdma->control, 1 << 16);
+			if (in_le32(&pi->dbdma->status) & ACTIVE) {
+				/* possible race here? */
+				udelay(10);
+				if (in_le32(&pi->dbdma->status) & ACTIVE) {
+					pi->dbdma_ring.stopping = 0;
+					return 0; /* keep running */
+				}
+			}
+		}
+
+		/* make sure RUN, PAUSE and S0 bits are cleared */
+		out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
+
+		/* set branch condition select register */
+		out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);
+
+		/* write dma command buffer address to the dbdma chip */
+		out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
+
+		/* initialize the frame count and current period */
+		pi->current_period = 0;
+		pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
+
+		/* set the DMA controller running */
+		out_le32(&pi->dbdma->control, (RUN << 16) | RUN);
+
+		/* off you go! */
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (!pi->dbdma_ring.running)
+			return -EALREADY;
+		pi->dbdma_ring.running = 0;
+
+		/* Set the S0 bit to make the DMA branch to the stop cmd */
+		out_le32(&pi->dbdma->control, (1 << 16) | 1);
+		pi->dbdma_ring.stopping = 1;
+
+		list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
+			if (cii->codec->stop)
+				cii->codec->stop(cii, pi->substream);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
+{
+	struct pcm_info *pi;
+	u32 fc;
+
+	get_pcm_info(i2sdev, in, &pi, NULL);
+
+	fc = in_le32(&i2sdev->intfregs->frame_count);
+	fc = fc - pi->frame_count;
+
+	if (fc >= pi->substream->runtime->buffer_size)
+		fc %= pi->substream->runtime->buffer_size;
+	return fc;
+}
+
+static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
+{
+	struct pcm_info *pi;
+	u32 fc, nframes;
+	u32 status;
+	int timeout, i;
+	int dma_stopped = 0;
+	struct snd_pcm_runtime *runtime;
+
+	scoped_guard(spinlock, &i2sdev->low_lock) {
+		get_pcm_info(i2sdev, in, &pi, NULL);
+		if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
+			return;
+
+		i = pi->current_period;
+		runtime = pi->substream->runtime;
+		while (pi->dbdma_ring.cmds[i].xfer_status) {
+			if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
+				/*
+				 * BT is the branch taken bit.  If it took a branch
+				 * it is because we set the S0 bit to make it
+				 * branch to the stop command.
+				 */
+				dma_stopped = 1;
+			pi->dbdma_ring.cmds[i].xfer_status = 0;
+
+			if (++i >= runtime->periods) {
+				i = 0;
+				pi->frame_count += runtime->buffer_size;
+			}
+			pi->current_period = i;
+
+			/*
+			 * Check the frame count.  The DMA tends to get a bit
+			 * ahead of the frame counter, which confuses the core.
+			 */
+			fc = in_le32(&i2sdev->intfregs->frame_count);
+			nframes = i * runtime->period_size;
+			if (fc < pi->frame_count + nframes)
+				pi->frame_count = fc - nframes;
+		}
+
+		if (dma_stopped) {
+			timeout = 1000;
+			for (;;) {
+				status = in_le32(&pi->dbdma->status);
+				if (!(status & ACTIVE) && (!in || (status & 0x80)))
+					break;
+				if (--timeout <= 0) {
+					printk(KERN_ERR
+					       "i2sbus: timed out waiting for DMA to stop!\n");
+					break;
+				}
+				udelay(1);
+			}
+
+			/* Turn off DMA controller, clear S0 bit */
+			out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
+
+			pi->dbdma_ring.stopping = 0;
+			if (pi->stop_completion)
+				complete(pi->stop_completion);
+		}
+
+		if (!pi->dbdma_ring.running)
+			return;
+	}
+
+	/* may call _trigger again, hence needs to be unlocked */
+	snd_pcm_period_elapsed(pi->substream);
+}
+
+irqreturn_t i2sbus_tx_intr(int irq, void *devid)
+{
+	handle_interrupt((struct i2sbus_dev *)devid, 0);
+	return IRQ_HANDLED;
+}
+
+irqreturn_t i2sbus_rx_intr(int irq, void *devid)
+{
+	handle_interrupt((struct i2sbus_dev *)devid, 1);
+	return IRQ_HANDLED;
+}
+
+static int i2sbus_playback_open(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	i2sdev->out.substream = substream;
+	return i2sbus_pcm_open(i2sdev, 0);
+}
+
+static int i2sbus_playback_close(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+	int err;
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->out.substream != substream)
+		return -EINVAL;
+	err = i2sbus_pcm_close(i2sdev, 0);
+	if (!err)
+		i2sdev->out.substream = NULL;
+	return err;
+}
+
+static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->out.substream != substream)
+		return -EINVAL;
+	return i2sbus_pcm_prepare(i2sdev, 0);
+}
+
+static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->out.substream != substream)
+		return -EINVAL;
+	return i2sbus_pcm_trigger(i2sdev, 0, cmd);
+}
+
+static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
+						 *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->out.substream != substream)
+		return 0;
+	return i2sbus_pcm_pointer(i2sdev, 0);
+}
+
+static const struct snd_pcm_ops i2sbus_playback_ops = {
+	.open =		i2sbus_playback_open,
+	.close =	i2sbus_playback_close,
+	.hw_params =	i2sbus_playback_hw_params,
+	.hw_free =	i2sbus_playback_hw_free,
+	.prepare =	i2sbus_playback_prepare,
+	.trigger =	i2sbus_playback_trigger,
+	.pointer =	i2sbus_playback_pointer,
+};
+
+static int i2sbus_record_open(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	i2sdev->in.substream = substream;
+	return i2sbus_pcm_open(i2sdev, 1);
+}
+
+static int i2sbus_record_close(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+	int err;
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->in.substream != substream)
+		return -EINVAL;
+	err = i2sbus_pcm_close(i2sdev, 1);
+	if (!err)
+		i2sdev->in.substream = NULL;
+	return err;
+}
+
+static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->in.substream != substream)
+		return -EINVAL;
+	return i2sbus_pcm_prepare(i2sdev, 1);
+}
+
+static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->in.substream != substream)
+		return -EINVAL;
+	return i2sbus_pcm_trigger(i2sdev, 1, cmd);
+}
+
+static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
+					       *substream)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
+
+	if (!i2sdev)
+		return -EINVAL;
+	if (i2sdev->in.substream != substream)
+		return 0;
+	return i2sbus_pcm_pointer(i2sdev, 1);
+}
+
+static const struct snd_pcm_ops i2sbus_record_ops = {
+	.open =		i2sbus_record_open,
+	.close =	i2sbus_record_close,
+	.hw_params =	i2sbus_record_hw_params,
+	.hw_free =	i2sbus_record_hw_free,
+	.prepare =	i2sbus_record_prepare,
+	.trigger =	i2sbus_record_trigger,
+	.pointer =	i2sbus_record_pointer,
+};
+
+static void i2sbus_private_free(struct snd_pcm *pcm)
+{
+	struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
+	struct codec_info_item *p, *tmp;
+
+	i2sdev->sound.pcm = NULL;
+	i2sdev->out.created = 0;
+	i2sdev->in.created = 0;
+	list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
+		printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
+		list_del(&p->list);
+		module_put(p->codec->owner);
+		kfree(p);
+	}
+	soundbus_dev_put(&i2sdev->sound);
+	module_put(THIS_MODULE);
+}
+
+int
+i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
+		    struct codec_info *ci, void *data)
+{
+	int err, in = 0, out = 0;
+	struct transfer_info *tmp;
+	struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
+	struct codec_info_item *cii;
+
+	if (!dev->pcmname || dev->pcmid == -1) {
+		printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
+		return -EINVAL;
+	}
+
+	list_for_each_entry(cii, &dev->codec_list, list) {
+		if (cii->codec_data == data)
+			return -EALREADY;
+	}
+
+	if (!ci->transfers || !ci->transfers->formats
+	    || !ci->transfers->rates || !ci->usable)
+		return -EINVAL;
+
+	/* we currently code the i2s transfer on the clock, and support only
+	 * 32 and 64 */
+	if (ci->bus_factor != 32 && ci->bus_factor != 64)
+		return -EINVAL;
+
+	/* If you want to fix this, you need to keep track of what transport infos
+	 * are to be used, which codecs they belong to, and then fix all the
+	 * sysclock/busclock stuff above to depend on which is usable */
+	list_for_each_entry(cii, &dev->codec_list, list) {
+		if (cii->codec->sysclock_factor != ci->sysclock_factor) {
+			printk(KERN_DEBUG
+			       "cannot yet handle multiple different sysclocks!\n");
+			return -EINVAL;
+		}
+		if (cii->codec->bus_factor != ci->bus_factor) {
+			printk(KERN_DEBUG
+			       "cannot yet handle multiple different bus clocks!\n");
+			return -EINVAL;
+		}
+	}
+
+	tmp = ci->transfers;
+	while (tmp->formats && tmp->rates) {
+		if (tmp->transfer_in)
+			in = 1;
+		else
+			out = 1;
+		tmp++;
+	}
+
+	cii = kzalloc_obj(struct codec_info_item);
+	if (!cii)
+		return -ENOMEM;
+
+	/* use the private data to point to the codec info */
+	cii->sdev = soundbus_dev_get(dev);
+	cii->codec = ci;
+	cii->codec_data = data;
+
+	if (!cii->sdev) {
+		printk(KERN_DEBUG
+		       "i2sbus: failed to get soundbus dev reference\n");
+		err = -ENODEV;
+		goto out_free_cii;
+	}
+
+	if (!try_module_get(THIS_MODULE)) {
+		printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
+		err = -EBUSY;
+		goto out_put_sdev;
+	}
+
+	if (!try_module_get(ci->owner)) {
+		printk(KERN_DEBUG
+		       "i2sbus: failed to get module reference to codec owner!\n");
+		err = -EBUSY;
+		goto out_put_this_module;
+	}
+
+	if (!dev->pcm) {
+		err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
+				  &dev->pcm);
+		if (err) {
+			printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
+			goto out_put_ci_module;
+		}
+	}
+
+	/* ALSA yet again sucks.
+	 * If it is ever fixed, remove this line. See below. */
+	out = in = 1;
+
+	if (!i2sdev->out.created && out) {
+		if (dev->pcm->card != card) {
+			/* eh? */
+			printk(KERN_ERR
+			       "Can't attach same bus to different cards!\n");
+			err = -EINVAL;
+			goto out_put_ci_module;
+		}
+		err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
+		if (err)
+			goto out_put_ci_module;
+		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
+				&i2sbus_playback_ops);
+		dev->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].dev->parent =
+			&dev->ofdev.dev;
+		i2sdev->out.created = 1;
+	}
+
+	if (!i2sdev->in.created && in) {
+		if (dev->pcm->card != card) {
+			printk(KERN_ERR
+			       "Can't attach same bus to different cards!\n");
+			err = -EINVAL;
+			goto out_put_ci_module;
+		}
+		err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
+		if (err)
+			goto out_put_ci_module;
+		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
+				&i2sbus_record_ops);
+		dev->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].dev->parent =
+			&dev->ofdev.dev;
+		i2sdev->in.created = 1;
+	}
+
+	/* so we have to register the pcm after adding any substream
+	 * to it because alsa doesn't create the devices for the
+	 * substreams when we add them later.
+	 * Therefore, force in and out on both busses (above) and
+	 * register the pcm now instead of just after creating it.
+	 */
+	err = snd_device_register(card, dev->pcm);
+	if (err) {
+		printk(KERN_ERR "i2sbus: error registering new pcm\n");
+		goto out_put_ci_module;
+	}
+	/* no errors any more, so let's add this to our list */
+	list_add(&cii->list, &dev->codec_list);
+
+	dev->pcm->private_data = i2sdev;
+	dev->pcm->private_free = i2sbus_private_free;
+
+	/* well, we really should support scatter/gather DMA */
+	snd_pcm_set_managed_buffer_all(
+		dev->pcm, SNDRV_DMA_TYPE_DEV,
+		&macio_get_pci_dev(i2sdev->macio)->dev,
+		64 * 1024, 64 * 1024);
+
+	return 0;
+ out_put_ci_module:
+	module_put(ci->owner);
+ out_put_this_module:
+	module_put(THIS_MODULE);
+ out_put_sdev:
+	soundbus_dev_put(dev);
+ out_free_cii:
+	kfree(cii);
+	return err;
+}
+
+void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
+{
+	struct codec_info_item *cii = NULL, *i;
+
+	list_for_each_entry(i, &dev->codec_list, list) {
+		if (i->codec_data == data) {
+			cii = i;
+			break;
+		}
+	}
+	if (cii) {
+		list_del(&cii->list);
+		module_put(cii->codec->owner);
+		kfree(cii);
+	}
+	/* no more codecs, but still a pcm? */
+	if (list_empty(&dev->codec_list) && dev->pcm) {
+		/* the actual cleanup is done by the callback above! */
+		snd_device_free(dev->pcm->card, dev->pcm);
+	}
+}
diff --git a/sound/aoa/soundbus/soundbus.h b/sound/aoa/soundbus/soundbus.h
new file mode 100644
index 000000000..877cbad93
--- /dev/null
+++ b/sound/aoa/soundbus/soundbus.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * soundbus generic definitions
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ */
+#ifndef __SOUNDBUS_H
+#define __SOUNDBUS_H
+
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <linux/list.h>
+
+
+/* When switching from master to slave or the other way around,
+ * you don't want to have the codec chip acting as clock source
+ * while the bus still is.
+ * More importantly, while switch from slave to master, you need
+ * to turn off the chip's master function first, but then there's
+ * no clock for a while and other chips might reset, so we notify
+ * their drivers after having switched.
+ * The constants here are codec-point of view, so when we switch
+ * the soundbus to master we tell the codec we're going to switch
+ * and give it CLOCK_SWITCH_PREPARE_SLAVE!
+ */
+enum clock_switch {
+	CLOCK_SWITCH_PREPARE_SLAVE,
+	CLOCK_SWITCH_PREPARE_MASTER,
+	CLOCK_SWITCH_SLAVE,
+	CLOCK_SWITCH_MASTER,
+	CLOCK_SWITCH_NOTIFY,
+};
+
+/* information on a transfer the codec can take */
+struct transfer_info {
+	u64 formats;		/* SNDRV_PCM_FMTBIT_* */
+	unsigned int rates;	/* SNDRV_PCM_RATE_* */
+	/* flags */
+	u32 transfer_in:1, /* input = 1, output = 0 */
+	    must_be_clock_source:1;
+	/* for codecs to distinguish among their TIs */
+	int tag;
+};
+
+struct codec_info_item {
+	struct codec_info *codec;
+	void *codec_data;
+	struct soundbus_dev *sdev;
+	/* internal, to be used by the soundbus provider */
+	struct list_head list;
+};
+
+/* for prepare, where the codecs need to know
+ * what we're going to drive the bus with */
+struct bus_info {
+	/* see below */
+	int sysclock_factor;
+	int bus_factor;
+};
+
+/* information on the codec itself, plus function pointers */
+struct codec_info {
+	/* the module this lives in */
+	struct module *owner;
+
+	/* supported transfer possibilities, array terminated by
+	 * formats or rates being 0. */
+	struct transfer_info *transfers;
+
+	/* Master clock speed factor
+	 * to be used (master clock speed = sysclock_factor * sampling freq)
+	 * Unused if the soundbus provider has no such notion.
+	 */
+	int sysclock_factor;
+
+	/* Bus factor, bus clock speed = bus_factor * sampling freq)
+	 * Unused if the soundbus provider has no such notion.
+	 */
+	int bus_factor;
+
+	/* operations */
+	/* clock switching, see above */
+	int (*switch_clock)(struct codec_info_item *cii,
+			    enum clock_switch clock);
+
+	/* called for each transfer_info when the user
+	 * opens the pcm device to determine what the
+	 * hardware can support at this point in time.
+	 * That can depend on other user-switchable controls.
+	 * Return 1 if usable, 0 if not.
+	 * out points to another instance of a transfer_info
+	 * which is initialised to the values in *ti, and
+	 * it's format and rate values can be modified by
+	 * the callback if it is necessary to further restrict
+	 * the formats that can be used at the moment, for
+	 * example when one codec has multiple logical codec
+	 * info structs for multiple inputs.
+	 */
+	int (*usable)(struct codec_info_item *cii,
+		      struct transfer_info *ti,
+		      struct transfer_info *out);
+
+	/* called when pcm stream is opened, probably not implemented
+	 * most of the time since it isn't too useful */
+	int (*open)(struct codec_info_item *cii,
+		    struct snd_pcm_substream *substream);
+
+	/* called when the pcm stream is closed, at this point
+	 * the user choices can all be unlocked (see below) */
+	int (*close)(struct codec_info_item *cii,
+		     struct snd_pcm_substream *substream);
+
+	/* if the codec must forbid some user choices because
+	 * they are not valid with the substream/transfer info,
+	 * it must do so here. Example: no digital output for
+	 * incompatible framerate, say 8KHz, on Onyx.
+	 * If the selected stuff in the substream is NOT
+	 * compatible, you have to reject this call! */
+	int (*prepare)(struct codec_info_item *cii,
+		       struct bus_info *bi,
+		       struct snd_pcm_substream *substream);
+
+	/* start() is called before data is pushed to the codec.
+	 * Note that start() must be atomic! */
+	int (*start)(struct codec_info_item *cii,
+		     struct snd_pcm_substream *substream);
+
+	/* stop() is called after data is no longer pushed to the codec.
+	 * Note that stop() must be atomic! */
+	int (*stop)(struct codec_info_item *cii,
+		    struct snd_pcm_substream *substream);
+
+	int (*suspend)(struct codec_info_item *cii, pm_message_t state);
+	int (*resume)(struct codec_info_item *cii);
+};
+
+/* information on a soundbus device */
+struct soundbus_dev {
+	/* the bus it belongs to */
+	struct list_head onbuslist;
+
+	/* the of device it represents */
+	struct platform_device ofdev;
+
+	/* what modules go by */
+	char modalias[32];
+
+	/* These fields must be before attach_codec can be called.
+	 * They should be set by the owner of the alsa card object
+	 * that is needed, and whoever sets them must make sure
+	 * that they are unique within that alsa card object. */
+	char *pcmname;
+	int pcmid;
+
+	/* this is assigned by the soundbus provider in attach_codec */
+	struct snd_pcm *pcm;
+
+	/* operations */
+	/* attach a codec to this soundbus, give the alsa
+	 * card object the PCMs for this soundbus should be in.
+	 * The 'data' pointer must be unique, it is used as the
+	 * key for detach_codec(). */
+	int (*attach_codec)(struct soundbus_dev *dev, struct snd_card *card,
+			    struct codec_info *ci, void *data);
+	void (*detach_codec)(struct soundbus_dev *dev, void *data);
+	/* TODO: suspend/resume */
+
+	/* private for the soundbus provider */
+	struct list_head codec_list;
+	u32 have_out:1, have_in:1;
+};
+#define to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev.dev)
+#define of_to_soundbus_device(d) container_of(d, struct soundbus_dev, ofdev)
+
+extern int soundbus_add_one(struct soundbus_dev *dev);
+extern void soundbus_remove_one(struct soundbus_dev *dev);
+
+extern struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev);
+extern void soundbus_dev_put(struct soundbus_dev *dev);
+
+struct soundbus_driver {
+	char *name;
+	struct module *owner;
+
+	/* we don't implement any matching at all */
+
+	int	(*probe)(struct soundbus_dev* dev);
+	void	(*remove)(struct soundbus_dev *dev);
+
+	int	(*shutdown)(struct soundbus_dev* dev);
+
+	struct device_driver driver;
+};
+#define to_soundbus_driver(drv) container_of(drv,struct soundbus_driver, driver)
+
+extern int soundbus_register_driver(struct soundbus_driver *drv);
+extern void soundbus_unregister_driver(struct soundbus_driver *drv);
+
+extern struct attribute *soundbus_dev_attrs[];
+
+#endif /* __SOUNDBUS_H */
diff --git a/sound/aoa/soundbus/sysfs.c b/sound/aoa/soundbus/sysfs.c
new file mode 100644
index 000000000..e87b28428
--- /dev/null
+++ b/sound/aoa/soundbus/sysfs.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/stat.h>
+/* FIX UP */
+#include "soundbus.h"
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct soundbus_dev *sdev = to_soundbus_device(dev);
+	struct platform_device *of = &sdev->ofdev;
+
+	if (*sdev->modalias)
+		return sysfs_emit(buf, "%s\n", sdev->modalias);
+	else
+		return sysfs_emit(buf, "of:N%pOFn%c%s\n",
+				  of->dev.of_node, 'T',
+				  of_node_get_device_type(of->dev.of_node));
+}
+static DEVICE_ATTR_RO(modalias);
+
+static ssize_t name_show(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct soundbus_dev *sdev = to_soundbus_device(dev);
+	struct platform_device *of = &sdev->ofdev;
+
+	return sysfs_emit(buf, "%pOFn\n", of->dev.of_node);
+}
+static DEVICE_ATTR_RO(name);
+
+static ssize_t type_show(struct device *dev,
+			 struct device_attribute *attr, char *buf)
+{
+	struct soundbus_dev *sdev = to_soundbus_device(dev);
+	struct platform_device *of = &sdev->ofdev;
+
+	return sysfs_emit(buf, "%s\n", of_node_get_device_type(of->dev.of_node));
+}
+static DEVICE_ATTR_RO(type);
+
+struct attribute *soundbus_dev_attrs[] = {
+	&dev_attr_name.attr,
+	&dev_attr_type.attr,
+	&dev_attr_modalias.attr,
+	NULL,
+};
author	Linus Torvalds <torvalds@linux-foundation.org>	2026-08-23 13:28:57 -0700
committer	Linus Torvalds <torvalds@linux-foundation.org>	2026-08-23 13:28:57 -0700
commit	4352b8aee98005853aa63f57d6377282de17a33f (patch)
tree	27614d7a9ef05c32d089004e104364ce42324837 /sound/aoa
download	linux-stable-4352b8aee98005853aa63f57d6377282de17a33f.tar.gz linux-stable-4352b8aee98005853aa63f57d6377282de17a33f.zip