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Input: wm9712 - fix wrong pen up readings 

Often a reading can be wrong. This patch assures that this is really a
pen up event and not a false reading.

Based on wm9712: pen up by Teresa Gámez and Christian Hemp.

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 15:21:33 -08:00 committed by Dmitry Torokhov
parent fa45255ee7
commit 540792753c
1 changed files with 6 additions and 2 deletions
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8
drivers/input/touchscreen/wm9712.c
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@ -302,8 +302,12 @@ static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
}
if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
wm->pen_probably_down = 0;
return RC_PENUP;
/* Sometimes it reads a wrong value the first time. */
*sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
if (!(*sample & WM97XX_PEN_DOWN)) {
wm->pen_probably_down = 0;
return RC_PENUP;
}
}
return RC_VALID;