Input: st1232 - add support for st1633

Add support for the Sitronix ST1633 touchscreen controller to the st1232
driver. A protocol spec can be found here:
www.ampdisplay.com/documents/pdf/AM-320480B6TZQW-TC0H.pdf
Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/sitronix-st1232.txt

-* Sitronix st1232 touchscreen controller
+* Sitronix st1232 or st1633 touchscreen controller
 
 Required properties:
-- compatible: must be "sitronix,st1232"
+- compatible: must contain one of
+  * "sitronix,st1232"
+  * "sitronix,st1633"
 - reg: I2C address of the chip
 - interrupts: interrupt to which the chip is connected
 

drivers/input/touchscreen/Kconfig

@@ -1168,11 +1168,11 @@ config TOUCHSCREEN_SIS_I2C
 	  module will be called sis_i2c.
 
 config TOUCHSCREEN_ST1232
-	tristate "Sitronix ST1232 touchscreen controllers"
+	tristate "Sitronix ST1232 or ST1633 touchscreen controllers"
 	depends on I2C
 	help
-	  Say Y here if you want to support Sitronix ST1232
-	  touchscreen controller.
+	  Say Y here if you want to support the Sitronix ST1232
+	  or ST1633 touchscreen controller.
 
 	  If unsure, say N.
 

drivers/input/touchscreen/st1232.c

@@ -23,13 +23,7 @@
 #include <linux/types.h>
 
 #define ST1232_TS_NAME	"st1232-ts"
-
-#define MIN_X		0x00
-#define MIN_Y		0x00
-#define MAX_X		0x31f	/* (800 - 1) */
-#define MAX_Y		0x1df	/* (480 - 1) */
-#define MAX_AREA	0xff
-#define MAX_FINGERS	2
+#define ST1633_TS_NAME	"st1633-ts"
 
 struct st1232_ts_finger {
 	u16 x;
@@ -38,12 +32,24 @@ struct st1232_ts_finger {
 	bool is_valid;
 };
 
+struct st_chip_info {
+	bool	have_z;
+	u16	max_x;
+	u16	max_y;
+	u16	max_area;
+	u16	max_fingers;
+	u8	start_reg;
+};
+
 struct st1232_ts_data {
 	struct i2c_client *client;
 	struct input_dev *input_dev;
-	struct st1232_ts_finger finger[MAX_FINGERS];
 	struct dev_pm_qos_request low_latency_req;
 	int reset_gpio;
+	const struct st_chip_info *chip_info;
+	int read_buf_len;
+	u8 *read_buf;
+	struct st1232_ts_finger *finger;
 };
 
 static int st1232_ts_read_data(struct st1232_ts_data *ts)
@@ -52,40 +58,35 @@ static int st1232_ts_read_data(struct st1232_ts_data *ts)
 	struct i2c_client *client = ts->client;
 	struct i2c_msg msg[2];
 	int error;
-	u8 start_reg;
-	u8 buf[10];
+	int i, y;
+	u8 start_reg = ts->chip_info->start_reg;
+	u8 *buf = ts->read_buf;
 
-	/* read touchscreen data from ST1232 */
+	/* read touchscreen data */
 	msg[0].addr = client->addr;
 	msg[0].flags = 0;
 	msg[0].len = 1;
 	msg[0].buf = &start_reg;
-	start_reg = 0x10;
 
 	msg[1].addr = ts->client->addr;
 	msg[1].flags = I2C_M_RD;
-	msg[1].len = sizeof(buf);
+	msg[1].len = ts->read_buf_len;
 	msg[1].buf = buf;
 
 	error = i2c_transfer(client->adapter, msg, 2);
 	if (error < 0)
 		return error;
 
-	/* get "valid" bits */
-	finger[0].is_valid = buf[2] >> 7;
-	finger[1].is_valid = buf[5] >> 7;
-
-	/* get xy coordinate */
-	if (finger[0].is_valid) {
-		finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3];
-		finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4];
-		finger[0].t = buf[8];
-	}
+	for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
+		finger[i].is_valid = buf[i + y] >> 7;
+		if (finger[i].is_valid) {
+			finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1];
+			finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2];
 
-	if (finger[1].is_valid) {
-		finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6];
-		finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7];
-		finger[1].t = buf[9];
+			/* st1232 includes a z-axis / touch strength */
+			if (ts->chip_info->have_z)
+				finger[i].t = buf[i + 6];
+		}
 	}
 
 	return 0;
@@ -104,11 +105,14 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
 		goto end;
 
 	/* multi touch protocol */
-	for (i = 0; i < MAX_FINGERS; i++) {
+	for (i = 0; i < ts->chip_info->max_fingers; i++) {
 		if (!finger[i].is_valid)
 			continue;
 
-		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t);
+		if (ts->chip_info->have_z)
+			input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
+					 finger[i].t);
+
 		input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x);
 		input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y);
 		input_mt_sync(input_dev);
@@ -142,13 +146,41 @@ static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
 		gpio_direction_output(ts->reset_gpio, poweron);
 }
 
+static const struct st_chip_info st1232_chip_info = {
+	.have_z		= true,
+	.max_x		= 0x31f, /* 800 - 1 */
+	.max_y		= 0x1df, /* 480 -1 */
+	.max_area	= 0xff,
+	.max_fingers	= 2,
+	.start_reg	= 0x12,
+};
+
+static const struct st_chip_info st1633_chip_info = {
+	.have_z		= false,
+	.max_x		= 0x13f, /* 320 - 1 */
+	.max_y		= 0x1df, /* 480 -1 */
+	.max_area	= 0x00,
+	.max_fingers	= 5,
+	.start_reg	= 0x12,
+};
+
 static int st1232_ts_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
+	const struct st_chip_info *match;
 	struct st1232_ts_data *ts;
+	struct st1232_ts_finger *finger;
 	struct input_dev *input_dev;
 	int error;
 
+	match = device_get_match_data(&client->dev);
+	if (!match && id)
+		match = (const void *)id->driver_data;
+	if (!match) {
+		dev_err(&client->dev, "unknown device model\n");
+		return -ENODEV;
+	}
+
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "need I2C_FUNC_I2C\n");
 		return -EIO;
@@ -163,6 +195,19 @@ static int st1232_ts_probe(struct i2c_client *client,
 	if (!ts)
 		return -ENOMEM;
 
+	ts->chip_info = match;
+	ts->finger = devm_kcalloc(&client->dev,
+				  ts->chip_info->max_fingers, sizeof(*finger),
+				  GFP_KERNEL);
+	if (!ts->finger)
+		return -ENOMEM;
+
+	/* allocate a buffer according to the number of registers to read */
+	ts->read_buf_len = ts->chip_info->max_fingers * 4;
+	ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
+	if (!ts->read_buf)
+		return -ENOMEM;
+
 	input_dev = devm_input_allocate_device(&client->dev);
 	if (!input_dev)
 		return -ENOMEM;
@@ -192,9 +237,14 @@ static int st1232_ts_probe(struct i2c_client *client,
 	__set_bit(EV_KEY, input_dev->evbit);
 	__set_bit(EV_ABS, input_dev->evbit);
 
-	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0);
-	input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0);
-	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0);
+	if (ts->chip_info->have_z)
+		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
+				     ts->chip_info->max_area, 0, 0);
+
+	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
+			     0, ts->chip_info->max_x, 0, 0);
+	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
+			     0, ts->chip_info->max_y, 0, 0);
 
 	error = devm_request_threaded_irq(&client->dev, client->irq,
 					  NULL, st1232_ts_irq_handler,
@@ -261,13 +311,15 @@ static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
 			 st1232_ts_suspend, st1232_ts_resume);
 
 static const struct i2c_device_id st1232_ts_id[] = {
-	{ ST1232_TS_NAME, 0 },
+	{ ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
+	{ ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
 
 static const struct of_device_id st1232_ts_dt_ids[] = {
-	{ .compatible = "sitronix,st1232", },
+	{ .compatible = "sitronix,st1232", .data = &st1232_chip_info },
+	{ .compatible = "sitronix,st1633", .data = &st1633_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);