1 files changed, 231 insertions, 17 deletions

diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
index e007e2e8f626..a6597f026980 100644
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -8,7 +8,9 @@
  */
 
 #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>
@@ -16,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/sizes.h>
 #include <linux/timer.h>
 #include <asm/unaligned.h>
 
@@ -23,15 +26,59 @@
 #define EXC3000_SLOTS_PER_FRAME		5
 #define EXC3000_LEN_FRAME		66
 #define EXC3000_LEN_POINT		10
-#define EXC3000_MT_EVENT		6
+
+#define EXC3000_LEN_MODEL_NAME		16
+#define EXC3000_LEN_FW_VERSION		16
+
+#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,
+};
+
+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,
+	},
+};
+
 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;
+	int query_result;
+	char model[EXC3000_LEN_MODEL_NAME];
+	char fw_version[EXC3000_LEN_FW_VERSION];
 };
 
 static void exc3000_report_slots(struct input_dev *input,
@@ -58,10 +105,15 @@ static void exc3000_timer(struct timer_list *t)
 	input_sync(data->input);
 }
 
-static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
+static int exc3000_read_frame(struct exc3000_data *data, u8 *buf)
 {
+	struct i2c_client *client = data->client;
+	u8 expected_event = EXC3000_MT1_EVENT;
 	int ret;
 
+	if (data->info->max_xy == SZ_16K - 1)
+		expected_event = EXC3000_MT2_EVENT;
+
 	ret = i2c_master_send(client, "'", 2);
 	if (ret < 0)
 		return ret;
@@ -76,19 +128,21 @@ static int exc3000_read_frame(struct i2c_client *client, u8 *buf)
 	if (ret != EXC3000_LEN_FRAME)
 		return -EIO;
 
-	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME ||
-			buf[2] != EXC3000_MT_EVENT)
+	if (get_unaligned_le16(buf) != EXC3000_LEN_FRAME)
+		return -EINVAL;
+
+	if (buf[2] != expected_event)
 		return -EINVAL;
 
 	return 0;
 }
 
-static int exc3000_read_data(struct i2c_client *client,
+static int exc3000_read_data(struct exc3000_data *data,
 			     u8 *buf, int *n_slots)
 {
 	int error;
 
-	error = exc3000_read_frame(client, buf);
+	error = exc3000_read_frame(data, buf);
 	if (error)
 		return error;
 
@@ -98,7 +152,7 @@ static int exc3000_read_data(struct i2c_client *client,
 
 	if (*n_slots > EXC3000_SLOTS_PER_FRAME) {
 		/* Read 2nd frame to get the rest of the contacts. */
-		error = exc3000_read_frame(client, buf + EXC3000_LEN_FRAME);
+		error = exc3000_read_frame(data, buf + EXC3000_LEN_FRAME);
 		if (error)
 			return error;
 
@@ -110,6 +164,28 @@ static int exc3000_read_data(struct i2c_client *client,
 	return 0;
 }
 
+static int exc3000_query_interrupt(struct exc3000_data *data)
+{
+	u8 *buf = data->buf;
+	int error;
+
+	error = i2c_master_recv(data->client, buf, EXC3000_LEN_FRAME);
+	if (error < 0)
+		return error;
+
+	if (buf[0] != 'B')
+		return -EPROTO;
+
+	if (buf[4] == 'E')
+		strlcpy(data->model, buf + 5, sizeof(data->model));
+	else if (buf[4] == 'D')
+		strlcpy(data->fw_version, buf + 5, sizeof(data->fw_version));
+	else
+		return -EPROTO;
+
+	return 0;
+}
+
 static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
 {
 	struct exc3000_data *data = dev_id;
@@ -118,7 +194,13 @@ static irqreturn_t exc3000_interrupt(int irq, void *dev_id)
 	int slots, total_slots;
 	int error;
 
-	error = exc3000_read_data(data->client, buf, &total_slots);
+	if (mutex_is_locked(&data->query_lock)) {
+		data->query_result = exc3000_query_interrupt(data);
+		complete(&data->wait_event);
+		goto out;
+	}
+
+	error = exc3000_read_data(data, buf, &total_slots);
 	if (error) {
 		/* Schedule a timer to release "stuck" contacts */
 		mod_timer(&data->timer,
@@ -145,31 +227,132 @@ out:
 	return IRQ_HANDLED;
 }
 
-static int exc3000_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+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);
+	static const u8 request[68] = {
+		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'D', 0x00
+	};
+	int error;
+
+	mutex_lock(&data->query_lock);
+
+	data->query_result = -ETIMEDOUT;
+	reinit_completion(&data->wait_event);
+
+	error = i2c_master_send(client, request, sizeof(request));
+	if (error < 0) {
+		mutex_unlock(&data->query_lock);
+		return error;
+	}
+
+	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
+	mutex_unlock(&data->query_lock);
+
+	if (data->query_result < 0)
+		return data->query_result;
+
+	return sprintf(buf, "%s\n", data->fw_version);
+}
+static DEVICE_ATTR_RO(fw_version);
+
+static ssize_t exc3000_get_model(struct exc3000_data *data)
+{
+	static const u8 request[68] = {
+		0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'E', 0x00
+	};
+	struct i2c_client *client = data->client;
+	int error;
+
+	mutex_lock(&data->query_lock);
+	data->query_result = -ETIMEDOUT;
+	reinit_completion(&data->wait_event);
+
+	error = i2c_master_send(client, request, sizeof(request));
+	if (error < 0) {
+		mutex_unlock(&data->query_lock);
+		return error;
+	}
+
+	wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ);
+	mutex_unlock(&data->query_lock);
+
+	return data->query_result;
+}
+
+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);
+	int error;
+
+	error = exc3000_get_model(data);
+	if (error < 0)
+		return error;
+
+	return sprintf(buf, "%s\n", data->model);
+}
+static DEVICE_ATTR_RO(model);
+
+static struct attribute *sysfs_attrs[] = {
+	&dev_attr_fw_version.attr,
+	&dev_attr_model.attr,
+	NULL
+};
+
+static struct attribute_group exc3000_attribute_group = {
+	.attrs = sysfs_attrs
+};
+
+static int exc3000_probe(struct i2c_client *client)
 {
 	struct exc3000_data *data;
 	struct input_dev *input;
-	int error;
+	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);
+
+	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 = "EETI EXC3000 Touch Screen";
+	input->name = data->info->name;
 	input->id.bustype = BUS_I2C;
 
-	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
-	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
+	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,
@@ -187,18 +370,49 @@ static int exc3000_probe(struct i2c_client *client,
 	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++) {
+		error = exc3000_get_model(data);
+		if (!error)
+			break;
+		dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n",
+			 retry + 1, error);
+	}
+
+	if (error)
+		return error;
+
+	dev_dbg(&client->dev, "TS Model: %s", data->model);
+
+	i2c_set_clientdata(client, data);
+
+	error = devm_device_add_group(&client->dev, &exc3000_attribute_group);
+	if (error)
+		return error;
+
 	return 0;
 }
 
 static const struct i2c_device_id exc3000_id[] = {
-	{ "exc3000", 0 },
+	{ "exc3000", EETI_EXC3000 },
+	{ "exc80h60", EETI_EXC80H60 },
+	{ "exc80h84", EETI_EXC80H84 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, exc3000_id);
 
 #ifdef CONFIG_OF
 static const struct of_device_id exc3000_of_match[] = {
-	{ .compatible = "eeti,exc3000" },
+	{ .compatible = "eeti,exc3000", .data = &exc3000_info[EETI_EXC3000] },
+	{ .compatible = "eeti,exc80h60", .data = &exc3000_info[EETI_EXC80H60] },
+	{ .compatible = "eeti,exc80h84", .data = &exc3000_info[EETI_EXC80H84] },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, exc3000_of_match);
@@ -210,7 +424,7 @@ static struct i2c_driver exc3000_driver = {
 		.of_match_table = of_match_ptr(exc3000_of_match),
 	},
 	.id_table	= exc3000_id,
-	.probe		= exc3000_probe,
+	.probe_new	= exc3000_probe,
 };
 
 module_i2c_driver(exc3000_driver);