Input: goodix - check the 'buffer status' bit before reading data

The MSB of the first byte read via I2C at the coordinates address
indicates whether the data is valid or ready (called "buffer status" in
the datasheets) when an interrupt is raised. Previously, this bit was
ignored, which resulted in a lot of incorrect detections of "finger
removed" events.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Paul Cercueil 2015-05-06 16:52:13 -07:00 committed by Dmitry Torokhov
parent c615dcb6d1
commit 5f6f117c12
1 changed files with 3 additions and 0 deletions

View File

@ -101,6 +101,9 @@ static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
return error;
}
if (!(data[0] & 0x80))
return -EAGAIN;
touch_num = data[0] & 0x0f;
if (touch_num > ts->max_touch_num)
return -EPROTO;