Input: tsc2007 - make sure that X plate resistance is specified

Abort driver initialization if X plate resistance was not specified in
platform data as it will cause pressure to be always calculated as 0,
and making userspace ignore touch coordinates.

Signed-off-by: Philip Rakity <prakity@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 0acca68cc52b..1f674cb6c55b 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -310,6 +310,12 @@ static int __devinit tsc2007_probe(struct i2c_client *client,
         ts->get_pendown_state = pdata->get_pendown_state;
         ts->clear_penirq      = pdata->clear_penirq;
 
+        if (pdata->x_plate_ohms == 0) {
+                dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
+                err = -EINVAL;
+                goto err_free_mem;
+        }
+
         snprintf(ts->phys, sizeof(ts->phys),
                  "%s/input0", dev_name(&client->dev));