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Input: mma8450 - fix signed 12bits to 32bits conversion

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Event value is wrong. Should be in range -2048 to 2047, but is in
range 0 to 4095.  Use s8 to int conversion and remove 0xfff mask.

Signed-off-by: Sebastien Royen <sebastien.royen@armadeus.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Sebastien Royen 2013-03-31 00:24:13 -07:00 committed by Dmitry Torokhov
parent 80e3e5328a
commit 257a1ec603
1 changed files with 3 additions and 3 deletions
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6
drivers/input/misc/mma8450.c
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@ -123,9 +123,9 @@ static void mma8450_poll(struct input_polled_dev *dev)
if (ret < 0)
return;
x = ((buf[1] << 4) & 0xff0) | (buf[0] & 0xf);
y = ((buf[3] << 4) & 0xff0) | (buf[2] & 0xf);
z = ((buf[5] << 4) & 0xff0) | (buf[4] & 0xf);
x = ((int)(s8)buf[1] << 4) | (buf[0] & 0xf);
y = ((int)(s8)buf[3] << 4) | (buf[2] & 0xf);
z = ((int)(s8)buf[5] << 4) | (buf[4] & 0xf);
input_report_abs(dev->input, ABS_X, x);
input_report_abs(dev->input, ABS_Y, y);