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
  ...

1 files changed, 229 insertions, 0 deletions

diff --git a/drivers/media/rc/ir-jvc-decoder.c b/drivers/media/rc/ir-jvc-decoder.c
new file mode 100644
index 000000000..8b10954d2
--- /dev/null
+++ b/drivers/media/rc/ir-jvc-decoder.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
+ *
+ * Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
+ */
+
+#include <linux/bitrev.h>
+#include <linux/module.h>
+#include "rc-core-priv.h"
+
+#define JVC_NBITS		16		/* dev(8) + func(8) */
+#define JVC_UNIT		525		/* us */
+#define JVC_HEADER_PULSE	(16 * JVC_UNIT) /* lack of header -> repeat */
+#define JVC_HEADER_SPACE	(8  * JVC_UNIT)
+#define JVC_BIT_PULSE		(1  * JVC_UNIT)
+#define JVC_BIT_0_SPACE		(1  * JVC_UNIT)
+#define JVC_BIT_1_SPACE		(3  * JVC_UNIT)
+#define JVC_TRAILER_PULSE	(1  * JVC_UNIT)
+#define	JVC_TRAILER_SPACE	(35 * JVC_UNIT)
+
+enum jvc_state {
+	STATE_INACTIVE,
+	STATE_HEADER_SPACE,
+	STATE_BIT_PULSE,
+	STATE_BIT_SPACE,
+	STATE_TRAILER_PULSE,
+	STATE_TRAILER_SPACE,
+	STATE_CHECK_REPEAT,
+};
+
+/**
+ * ir_jvc_decode() - Decode one JVC pulse or space
+ * @dev:	the struct rc_dev descriptor of the device
+ * @ev:   the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This function returns -EINVAL if the pulse violates the state machine
+ */
+static int ir_jvc_decode(struct rc_dev *dev, struct ir_raw_event ev)
+{
+	struct jvc_dec *data = &dev->raw->jvc;
+
+	if (!is_timing_event(ev)) {
+		if (ev.overflow)
+			data->state = STATE_INACTIVE;
+		return 0;
+	}
+
+	if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2))
+		goto out;
+
+	dev_dbg(&dev->dev, "JVC decode started at state %d (%uus %s)\n",
+		data->state, ev.duration, TO_STR(ev.pulse));
+
+again:
+	switch (data->state) {
+
+	case STATE_INACTIVE:
+		if (!ev.pulse)
+			break;
+
+		if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
+			break;
+
+		data->count = 0;
+		data->first = true;
+		data->toggle = !data->toggle;
+		data->state = STATE_HEADER_SPACE;
+		return 0;
+
+	case STATE_HEADER_SPACE:
+		if (ev.pulse)
+			break;
+
+		if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2))
+			break;
+
+		data->state = STATE_BIT_PULSE;
+		return 0;
+
+	case STATE_BIT_PULSE:
+		if (!ev.pulse)
+			break;
+
+		if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2))
+			break;
+
+		data->state = STATE_BIT_SPACE;
+		return 0;
+
+	case STATE_BIT_SPACE:
+		if (ev.pulse)
+			break;
+
+		data->bits <<= 1;
+		if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) {
+			data->bits |= 1;
+			decrease_duration(&ev, JVC_BIT_1_SPACE);
+		} else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2))
+			decrease_duration(&ev, JVC_BIT_0_SPACE);
+		else
+			break;
+		data->count++;
+
+		if (data->count == JVC_NBITS)
+			data->state = STATE_TRAILER_PULSE;
+		else
+			data->state = STATE_BIT_PULSE;
+		return 0;
+
+	case STATE_TRAILER_PULSE:
+		if (!ev.pulse)
+			break;
+
+		if (!eq_margin(ev.duration, JVC_TRAILER_PULSE, JVC_UNIT / 2))
+			break;
+
+		data->state = STATE_TRAILER_SPACE;
+		return 0;
+
+	case STATE_TRAILER_SPACE:
+		if (ev.pulse)
+			break;
+
+		if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2))
+			break;
+
+		if (data->first) {
+			u32 scancode;
+			scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) |
+				   (bitrev8((data->bits >> 0) & 0xff) << 0);
+			dev_dbg(&dev->dev, "JVC scancode 0x%04x\n", scancode);
+			rc_keydown(dev, RC_PROTO_JVC, scancode, data->toggle);
+			data->first = false;
+			data->old_bits = data->bits;
+		} else if (data->bits == data->old_bits) {
+			dev_dbg(&dev->dev, "JVC repeat\n");
+			rc_repeat(dev);
+		} else {
+			dev_dbg(&dev->dev, "JVC invalid repeat msg\n");
+			break;
+		}
+
+		data->count = 0;
+		data->state = STATE_CHECK_REPEAT;
+		return 0;
+
+	case STATE_CHECK_REPEAT:
+		if (!ev.pulse)
+			break;
+
+		if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2))
+			data->state = STATE_INACTIVE;
+  else
+			data->state = STATE_BIT_PULSE;
+		goto again;
+	}
+
+out:
+	dev_dbg(&dev->dev, "JVC decode failed at state %d (%uus %s)\n",
+		data->state, ev.duration, TO_STR(ev.pulse));
+	data->state = STATE_INACTIVE;
+	return -EINVAL;
+}
+
+static const struct ir_raw_timings_pd ir_jvc_timings = {
+	.header_pulse  = JVC_HEADER_PULSE,
+	.header_space  = JVC_HEADER_SPACE,
+	.bit_pulse     = JVC_BIT_PULSE,
+	.bit_space[0]  = JVC_BIT_0_SPACE,
+	.bit_space[1]  = JVC_BIT_1_SPACE,
+	.trailer_pulse = JVC_TRAILER_PULSE,
+	.trailer_space = JVC_TRAILER_SPACE,
+	.msb_first     = 1,
+};
+
+/**
+ * ir_jvc_encode() - Encode a scancode as a stream of raw events
+ *
+ * @protocol:	protocol to encode
+ * @scancode:	scancode to encode
+ * @events:	array of raw ir events to write into
+ * @max:	maximum size of @events
+ *
+ * Returns:	The number of events written.
+ *		-ENOBUFS if there isn't enough space in the array to fit the
+ *		encoding. In this case all @max events will have been written.
+ */
+static int ir_jvc_encode(enum rc_proto protocol, u32 scancode,
+			 struct ir_raw_event *events, unsigned int max)
+{
+	struct ir_raw_event *e = events;
+	int ret;
+	u32 raw = (bitrev8((scancode >> 8) & 0xff) << 8) |
+		  (bitrev8((scancode >> 0) & 0xff) << 0);
+
+	ret = ir_raw_gen_pd(&e, max, &ir_jvc_timings, JVC_NBITS, raw);
+	if (ret < 0)
+		return ret;
+
+	return e - events;
+}
+
+static struct ir_raw_handler jvc_handler = {
+	.protocols	= RC_PROTO_BIT_JVC,
+	.decode		= ir_jvc_decode,
+	.encode		= ir_jvc_encode,
+	.carrier	= 38000,
+	.min_timeout	= JVC_TRAILER_SPACE,
+};
+
+static int __init ir_jvc_decode_init(void)
+{
+	ir_raw_handler_register(&jvc_handler);
+
+	printk(KERN_INFO "IR JVC protocol handler initialized\n");
+	return 0;
+}
+
+static void __exit ir_jvc_decode_exit(void)
+{
+	ir_raw_handler_unregister(&jvc_handler);
+}
+
+module_init(ir_jvc_decode_init);
+module_exit(ir_jvc_decode_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
+MODULE_DESCRIPTION("JVC IR protocol decoder");