Input: atmel_mxt_ts - derive phys from i2c client adapter

This allows userspace to more easily distinguish which bus a particular
atmel_mxt_ts device is attached to.

The resulting phys will be something like:
 i2c-1-0067/input0

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 42e645062c20..b1108cae73ac 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -250,6 +250,7 @@ struct mxt_finger {
 struct mxt_data {
         struct i2c_client *client;
         struct input_dev *input_dev;
+        char phys[64];          /* device physical location */
         const struct mxt_platform_data *pdata;
         struct mxt_object *object_table;
         struct mxt_info info;
@@ -1106,6 +1107,10 @@ static int __devinit mxt_probe(struct i2c_client *client,
         }
 
         input_dev->name = "Atmel maXTouch Touchscreen";
+        snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
+                 client->adapter->nr, client->addr);
+        input_dev->phys = data->phys;
+
         input_dev->id.bustype = BUS_I2C;
         input_dev->dev.parent = &client->dev;
         input_dev->open = mxt_input_open;