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Input: wm97xx - drop out of range inputs

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With fast movements, there occured some out of screen jumps with my
touchscreen. The abs_x and abs_y module parameters should fix this by
default, but the driver doesn't actively checks the x/y coordinates.

Instead it seems that the input layer was supposed to drop out of range
inputs, as described in the comments:
"These parameters are used to help the input layer discard out of
range readings and reduce jitter etc"

The input layer documentation describes that values that are not in the
absolute range are also accepted.

So this patch adds a check within the driver.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Markus Pargmann 2013-03-09 15:19:56 -08:00 committed by Dmitry Torokhov
parent b4a034dab1
commit cfd5d09691
1 changed files with 11 additions and 0 deletions
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11
drivers/input/touchscreen/wm97xx-core.c
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@ -442,6 +442,16 @@ static int wm97xx_read_samples(struct wm97xx *wm)
"pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
data.x >> 12, data.x & 0xfff, data.y >> 12,
data.y & 0xfff, data.p >> 12, data.p & 0xfff);
if (abs_x[0] > (data.x & 0xfff) ||
abs_x[1] < (data.x & 0xfff) ||
abs_y[0] > (data.y & 0xfff) ||
abs_y[1] < (data.y & 0xfff)) {
dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
rc = RC_AGAIN;
goto out;
}
input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
@ -455,6 +465,7 @@ static int wm97xx_read_samples(struct wm97xx *wm)
wm->ts_reader_interval = wm->ts_reader_min_interval;
}
out:
mutex_unlock(&wm->codec_mutex);
return rc;
}