linux-kernel - [PATCH] Input: stmfts: Fix bug of ABS_MT_POSITION

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Date:   Wed, 18 Oct 2017 19:38:30 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     dmitry.torokhov@...il.com
Cc:     rydberg@...math.org, andi.shyti@...sung.com, robh@...nel.org,
        arnd@...db.de, cw00.choi@...sung.com, chanwoo@...nel.org,
        inki.dae@...sung.com, sw0312.kim@...sung.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH] Input: stmfts: Fix bug of ABS_MT_POSITION_* maximum size

The commit 78bcac7b2ae1e ("Input: add support for the STMicroelectronics
FingerTip touchscreen) used the 'touchscreen_parse_properties()' helper
function in order to get the value of common properties.

But, commit 78bcac7b2ae1e didn't set the capability of ABS_MT_POSITION_*
before calling touchscreen_parse_properties(). In result, the max_x and max_y
of 'struct touchscreen_propeties' were not set. So, this patch fixes the bug
to get the ABS_MT_POSITION_* maximum size.

Fixes: 78bcac7b2ae1e ("Input: add support for the STMicroelectronics FingerTip touchscreen")
Cc: stable@...r.kernel.org
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/input/touchscreen/stmfts.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
index 157fdb4bb2e8..8c6c6178ec12 100644
--- a/drivers/input/touchscreen/stmfts.c
+++ b/drivers/input/touchscreen/stmfts.c
@@ -663,12 +663,10 @@ static int stmfts_probe(struct i2c_client *client,
 	sdata->input->open = stmfts_input_open;
 	sdata->input->close = stmfts_input_close;
 
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
 	touchscreen_parse_properties(sdata->input, true, &sdata->prop);
 
-	input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0,
-						sdata->prop.max_x, 0, 0);
-	input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0,
-						sdata->prop.max_y, 0, 0);
 	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
 	input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
 	input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
-- 
1.9.1