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, 477 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
new file mode 100644
index 000000000..037bb3523
--- /dev/null
+++ b/drivers/input/touchscreen/exc3000.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for I2C connected EETI EXC3000 multiple touch controller
+ *
+ * Copyright (C) 2017 Ahmet Inan <inan@distec.de>
+ *
+ * minimal implementation based on egalax_ts.c and egalax_i2c.c
+ */
+
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sizes.h>
+#include <linux/timer.h>
+#include <linux/unaligned.h>
+
+#define EXC3000_NUM_SLOTS		10
+#define EXC3000_SLOTS_PER_FRAME		5
+#define EXC3000_LEN_FRAME		66
+#define EXC3000_LEN_VENDOR_REQUEST	68
+#define EXC3000_LEN_POINT		10
+
+#define EXC3000_LEN_MODEL_NAME		16
+#define EXC3000_LEN_FW_VERSION		16
+
+#define EXC3000_VENDOR_EVENT		0x03
+#define EXC3000_MT1_EVENT		0x06
+#define EXC3000_MT2_EVENT		0x18
+
+#define EXC3000_TIMEOUT_MS		100
+
+#define EXC3000_RESET_MS		10
+#define EXC3000_READY_MS		100
+
+static const struct i2c_device_id exc3000_id[];
+
+struct eeti_dev_info {
+	const char *name;
+	int max_xy;
+};
+
+enum eeti_dev_id {
+	EETI_EXC3000,
+	EETI_EXC80H60,
+	EETI_EXC80H84,
+	EETI_EXC81W32,
+};
+
+static struct eeti_dev_info exc3000_info[] = {
+	[EETI_EXC3000] = {
+		.name = "EETI EXC3000 Touch Screen",
+		.max_xy = SZ_4K - 1,
+	},
+	[EETI_EXC80H60] = {
+		.name = "EETI EXC80H60 Touch Screen",
+		.max_xy = SZ_16K - 1,
+	},
+	[EETI_EXC80H84] = {
+		.name = "EETI EXC80H84 Touch Screen",
+		.max_xy = SZ_16K - 1,
+	},
+	[EETI_EXC81W32] = {
+		.name = "EETI EXC81W32 Touch Screen",
+		.max_xy = SZ_16K - 1,
+	},
+};
+
+struct exc3000_data {
+	struct i2c_client *client;
+	const struct eeti_dev_info *info;
+	struct input_dev *input;
+	struct touchscreen_properties prop;
+	struct gpio_desc *reset;
+	struct timer_list timer;
+	u8 buf[2 * EXC3000_LEN_FRAME];
+	struct completion wait_event;
+	struct mutex query_lock;
+};
+
+static void exc3000_report_slots(struct input_dev *input,
+				 struct touchscreen_properties *prop,
+				 const u8 *buf, int num)
+{
+	for (; num--; buf += EXC3000_LEN_POINT) {
+		if (buf[0] & BIT(0)) {
+			input_mt_slot(input, buf[1]);
+			input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+			touchscreen_report_pos(input, prop,
+					       get_unaligned_le16(buf + 2),
+					       get_unaligned_le16(buf + 4),
+					       true);
+		}
+	}
+}
+
+static void exc3000_timer(struct timer_list *t)
+{
+	struct exc3000_data *data = timer_container_of(data, t, timer);
+
+	input_mt_sync_frame(data->input);
+	input_sync(data->input);
+}
+
+static inline void exc3000_schedule_timer(struct exc3000_data *data)
+{
+	mod_timer(&data->timer, jiffies + msecs_to_jiffies(EXC3000_TIMEOUT_MS));
+}
+
+static void exc3000_shutdown_timer(void *timer)
+{
+	timer_shutdown_sync(timer);
+}
+
+static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
+{
+	struct i2c_client *client = data->client;
+	int ret;
+
+	ret = i2c_master_send(client, "'", 2);
+	if (ret < 0)
+		return ret;
+
+	if (ret != 2)
+		return -EIO;
+
+	ret = i2c_master_recv(client, buf, EXC3000_LEN_FRAME);
+	if (ret < 0)
+		return ret;
+
+	if (ret != EXC3000_LEN_FRAME)
+		return -EIO;
+
+	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int exc3000_handle_mt_event(struct exc3000_data *data)
+{
+	struct input_dev *input = data->input;
+	int ret, total_slots;
+	u8 *buf = data->buf;
+
+	total_slots = buf[3];
+	if (!total_slots || total_slots > EXC3000_NUM_SLOTS) {
+		ret = -EINVAL;
+		goto out_fail;
+	}
+
+	if (total_slots > EXC3000_SLOTS_PER_FRAME) {
+		/* Read 2nd frame to get the rest of the contacts. */
+		ret = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
+		if (ret)
+			goto out_fail;
+
+		/* 2nd chunk must have number of contacts set to 0. */
+		if (buf[EXC3000_LEN_FRAME + 3] != 0) {
+			ret = -EINVAL;
+			goto out_fail;
+		}
+	}
+
+	/*
+	 * We read full state successfully, no contacts will be "stuck".
+	 */
+	timer_delete_sync(&data->timer);
+
+	while (total_slots > 0) {
+		int slots = min(total_slots, EXC3000_SLOTS_PER_FRAME);
+
+		exc3000_report_slots(input, &data->prop, buf + 4, slots);
+		total_slots -= slots;
+		buf += EXC3000_LEN_FRAME;
+	}
+
+	input_mt_sync_frame(input);
+	input_sync(input);
+
+	return 0;
+
+out_fail:
+	/* Schedule a timer to release "stuck" contacts */
+	exc3000_schedule_timer(data);
+
+	return ret;
+}
+
+static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
+{
+	struct exc3000_data *data = dev_id;
+	u8 *buf = data->buf;
+	int ret;
+
+	ret = exc3000_read_frame(data, buf);
+	if (ret) {
+		/* Schedule a timer to release "stuck" contacts */
+		exc3000_schedule_timer(data);
+		goto out;
+	}
+
+	switch (buf[2]) {
+	case EXC3000_VENDOR_EVENT:
+		complete(&data->wait_event);
+		break;
+
+	case EXC3000_MT1_EVENT:
+	case EXC3000_MT2_EVENT:
+		exc3000_handle_mt_event(data);
+		break;
+
+	default:
+		break;
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+static int exc3000_vendor_data_request(struct exc3000_data *data, u8 *request,
+				       u8 request_len, u8 *response, int timeout)
+{
+	u8 buf[EXC3000_LEN_VENDOR_REQUEST] = { 0x67, 0x00, 0x42, 0x00, 0x03 };
+	int ret;
+	unsigned long time_left;
+
+	guard(mutex)(&data->query_lock);
+
+	reinit_completion(&data->wait_event);
+
+	buf[5] = request_len;
+	memcpy(&buf[6], request, request_len);
+
+	ret = i2c_master_send(data->client, buf, EXC3000_LEN_VENDOR_REQUEST);
+	if (ret < 0)
+		return ret;
+
+	time_left = wait_for_completion_timeout(&data->wait_event,
+						timeout * HZ);
+	if (time_left == 0)
+		return -ETIMEDOUT;
+
+	if (data->buf[3] >= EXC3000_LEN_FRAME)
+		return -ENOSPC;
+
+	memcpy(response, &data->buf[4], data->buf[3]);
+	return data->buf[3];
+}
+
+static ssize_t fw_version_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct exc3000_data *data = i2c_get_clientdata(client);
+	u8 response[EXC3000_LEN_FRAME];
+	int ret;
+
+	/* query bootloader info */
+	ret = exc3000_vendor_data_request(data,
+					  (u8[]){0x39, 0x02}, 2, response, 1);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * If the bootloader version is non-zero then the device is in
+	 * bootloader mode and won't answer a query for the application FW
+	 * version, so we just use the bootloader version info.
+	 */
+	if (response[2] || response[3])
+		return sprintf(buf, "%d.%d\n", response[2], response[3]);
+
+	ret = exc3000_vendor_data_request(data, (u8[]){'D'}, 1, response, 1);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%s\n", &response[1]);
+}
+static DEVICE_ATTR_RO(fw_version);
+
+static ssize_t model_show(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct exc3000_data *data = i2c_get_clientdata(client);
+	u8 response[EXC3000_LEN_FRAME];
+	int ret;
+
+	ret = exc3000_vendor_data_request(data, (u8[]){'E'}, 1, response, 1);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%s\n", &response[1]);
+}
+static DEVICE_ATTR_RO(model);
+
+static ssize_t type_show(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct exc3000_data *data = i2c_get_clientdata(client);
+	u8 response[EXC3000_LEN_FRAME];
+	int ret;
+
+	ret = exc3000_vendor_data_request(data, (u8[]){'F'}, 1, response, 1);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%s\n", &response[1]);
+}
+static DEVICE_ATTR_RO(type);
+
+static struct attribute *exc3000_attrs[] = {
+	&dev_attr_fw_version.attr,
+	&dev_attr_model.attr,
+	&dev_attr_type.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(exc3000);
+
+static int exc3000_probe(struct i2c_client *client)
+{
+	struct exc3000_data *data;
+	struct input_dev *input;
+	int error, max_xy, retry;
+
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	data->info = device_get_match_data(&client->dev);
+	if (!data->info) {
+		enum eeti_dev_id eeti_dev_id =
+			i2c_match_id(exc3000_id, client)->driver_data;
+		data->info = &exc3000_info[eeti_dev_id];
+	}
+	timer_setup(&data->timer, exc3000_timer, 0);
+	init_completion(&data->wait_event);
+	mutex_init(&data->query_lock);
+
+	data->reset = devm_gpiod_get_optional(&client->dev, "reset",
+					      GPIOD_OUT_HIGH);
+	if (IS_ERR(data->reset))
+		return PTR_ERR(data->reset);
+
+	/* For proper reset sequence, enable power while reset asserted */
+	error = devm_regulator_get_enable(&client->dev, "vdd");
+	if (error && error != -ENODEV)
+		return dev_err_probe(&client->dev, error,
+				     "failed to request vdd regulator\n");
+
+	if (data->reset) {
+		msleep(EXC3000_RESET_MS);
+		gpiod_set_value_cansleep(data->reset, 0);
+		msleep(EXC3000_READY_MS);
+	}
+
+	input = devm_input_allocate_device(&client->dev);
+	if (!input)
+		return -ENOMEM;
+
+	data->input = input;
+	input_set_drvdata(input, data);
+
+	input->name = data->info->name;
+	input->id.bustype = BUS_I2C;
+
+	max_xy = data->info->max_xy;
+	input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
+
+	touchscreen_parse_properties(input, true, &data->prop);
+
+	error = input_mt_init_slots(input, EXC3000_NUM_SLOTS,
+				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error)
+		return error;
+
+	error = input_register_device(input);
+	if (error)
+		return error;
+
+	error = devm_add_action_or_reset(&client->dev, exc3000_shutdown_timer,
+					 &data->timer);
+	if (error)
+		return error;
+
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, exc3000_interrupt, IRQF_ONESHOT,
+					  client->name, data);
+	if (error)
+		return error;
+
+	/*
+	 * I²C does not have built-in recovery, so retry on failure. This
+	 * ensures, that the device probe will not fail for temporary issues
+	 * on the bus.  This is not needed for the sysfs calls (userspace
+	 * will receive the error code and can start another query) and
+	 * cannot be done for touch events (but that only means loosing one
+	 * or two touch events anyways).
+	 */
+	for (retry = 0; retry < 3; retry++) {
+		u8 response[EXC3000_LEN_FRAME];
+
+		error = exc3000_vendor_data_request(data, (u8[]){'E'}, 1,
+						    response, 1);
+		if (error > 0) {
+			dev_dbg(&client->dev, "TS Model: %s", &response[1]);
+			error = 0;
+			break;
+		}
+		dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
+			 retry + 1, error);
+	}
+
+	if (error)
+		return error;
+
+	i2c_set_clientdata(client, data);
+
+	return 0;
+}
+
+static const struct i2c_device_id exc3000_id[] = {
+	{ .name = "exc3000", .driver_data = EETI_EXC3000 },
+	{ .name = "exc80h60", .driver_data = EETI_EXC80H60 },
+	{ .name = "exc80h84", .driver_data = EETI_EXC80H84 },
+	{ .name = "exc81w32", .driver_data = EETI_EXC81W32 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, exc3000_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id exc3000_of_match[] = {
+	{ .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
+	{ .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
+	{ .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
+	{ .compatible = "eeti,exc81w32", .data = &exc3000_info[EETI_EXC81W32] },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, exc3000_of_match);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id exc3000_acpi_match[] = {
+	{ "EGA00001", .driver_data = (kernel_ulong_t)&exc3000_info[EETI_EXC80H60] },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, exc3000_acpi_match);
+#endif
+
+static struct i2c_driver exc3000_driver = {
+	.driver = {
+		.name	= "exc3000",
+		.dev_groups = exc3000_groups,
+		.of_match_table = of_match_ptr(exc3000_of_match),
+		.acpi_match_table = ACPI_PTR(exc3000_acpi_match),
+	},
+	.id_table	= exc3000_id,
+	.probe		= exc3000_probe,
+};
+
+module_i2c_driver(exc3000_driver);
+
+MODULE_AUTHOR("Ahmet Inan <inan@distec.de>");
+MODULE_DESCRIPTION("I2C connected EETI EXC3000 multiple touch controller driver");
+MODULE_LICENSE("GPL v2");