Touch events are not processed unless pressure > 0.
x_plat_ohms is used in pressure calculation. ensure driver
will not start if zero value and indicate reason why there is
a failure
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
drivers/input/touchscreen/tsc2007.c | 6 ++++++
include/linux/i2c/tsc2007.h | 2 +-
2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index 0acca68..628261b 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, "pdata->x_plate_ohms must be > 0");
+ err = -EINVAL;
+ goto err_free_mem;
+ }
+
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
diff --git a/include/linux/i2c/tsc2007.h b/include/linux/i2c/tsc2007.h
index 591427a..506a9f7 100644
--- a/include/linux/i2c/tsc2007.h
+++ b/include/linux/i2c/tsc2007.h
@@ -5,7 +5,7 @@
struct tsc2007_platform_data {
u16 model; /* 2007. */
- u16 x_plate_ohms;
+ u16 x_plate_ohms; /* must be non-zero value */
u16 max_rt; /* max. resistance above which samples are ignored */
unsigned long poll_delay; /* delay (in ms) after pen-down event
before polling starts */
--
1.7.6
--
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