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path: root/drivers/input/touchscreen/ad7879.c
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Diffstat (limited to 'drivers/input/touchscreen/ad7879.c')
-rw-r--r--drivers/input/touchscreen/ad7879.c32
1 files changed, 27 insertions, 5 deletions
diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c
index ba6f0bd1e762..bc3b5187f3a3 100644
--- a/drivers/input/touchscreen/ad7879.c
+++ b/drivers/input/touchscreen/ad7879.c
@@ -129,6 +129,9 @@ struct ad7879 {
u16 cmd_crtl1;
u16 cmd_crtl2;
u16 cmd_crtl3;
+ int x;
+ int y;
+ int Rt;
};
static int ad7879_read(struct ad7879 *ts, u8 reg)
@@ -175,13 +178,32 @@ static int ad7879_report(struct ad7879 *ts)
Rt /= z1;
Rt = (Rt + 2047) >> 12;
- if (!timer_pending(&ts->timer))
+ /*
+ * Sample found inconsistent, pressure is beyond
+ * the maximum. Don't report it to user space.
+ */
+ if (Rt > ts->pressure_max)
+ return -EINVAL;
+
+ /*
+ * Note that we delay reporting events by one sample.
+ * This is done to avoid reporting last sample of the
+ * touch sequence, which may be incomplete if finger
+ * leaves the surface before last reading is taken.
+ */
+ if (timer_pending(&ts->timer)) {
+ /* Touch continues */
input_report_key(input_dev, BTN_TOUCH, 1);
+ input_report_abs(input_dev, ABS_X, ts->x);
+ input_report_abs(input_dev, ABS_Y, ts->y);
+ input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
+ input_sync(input_dev);
+ }
+
+ ts->x = x;
+ ts->y = y;
+ ts->Rt = Rt;
- input_report_abs(input_dev, ABS_X, x);
- input_report_abs(input_dev, ABS_Y, y);
- input_report_abs(input_dev, ABS_PRESSURE, Rt);
- input_sync(input_dev);
return 0;
}