Input: atmel_mxt_ts - allow input name to be specified in platform data

Android systems identify the input device and map to IDC file by using the
input device name. To avoid unnecessary deltas to the driver file, allow
this to be set from the platform data.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>

Documentation/devicetree/bindings/input/atmel,maxtouch.txt

@@ -33,6 +33,8 @@ Optional properties for main touchpad device:
 - atmel,cfg_name: Provide name of configuration file in OBP_RAW format. This
     will be downloaded from the firmware loader on probe to the device.
 
+- atmel,input_name: Override name of input device from the default.
+
 Example:
 
 	touch@4b {

drivers/input/touchscreen/atmel_mxt_ts.c

@@ -2309,7 +2309,11 @@ static int mxt_initialize_input_device(struct mxt_data *data)
 	if (!input_dev)
 		return -ENOMEM;
 
-	input_dev->name = "Atmel maXTouch Touchscreen";
+	if (data->pdata->input_name)
+		input_dev->name = data->pdata->input_name;
+	else
+		input_dev->name = "Atmel maXTouch Touchscreen";
+
 	input_dev->phys = data->phys;
 	input_dev->id.bustype = BUS_I2C;
 	input_dev->dev.parent = dev;
@@ -3129,6 +3133,8 @@ static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
 
 	of_property_read_string(np, "atmel,cfg_name", &pdata->cfg_name);
 
+	of_property_read_string(np, "atmel,input_name", &pdata->input_name);
+
 	if (of_find_property(np, "linux,gpio-keymap", &proplen)) {
 		pdata->t19_num_keys = proplen / sizeof(u32);
 

include/linux/platform_data/atmel_mxt_ts.h

@@ -26,6 +26,7 @@ struct mxt_platform_data {
 	const unsigned int *t15_keymap;
 	unsigned long gpio_reset;
 	const char *cfg_name;
+	const char *input_name;
 };
 
 #endif /* __LINUX_PLATFORM_DATA_ATMEL_MXT_TS_H */