Input: atmel_mxt_ts - don't report zero pressure from T9

If T9.CTRL DISAMP is set, then pressure is reported as zero. This means
some app layers (eg tslib) will ignore the contact.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 77387f896262..e32667d82d0f 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -843,6 +843,10 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
                         mxt_input_sync(data);
                 }
 
+                /* if active, pressure must be non-zero */
+                if (!amplitude)
+                        amplitude = MXT_PRESSURE_DEFAULT;
+
                 /* Touch active */
                 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
                 input_report_abs(input_dev, ABS_MT_POSITION_X, x);