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Message-Id: <1430484036-17541-1-git-send-email-paul@crapouillou.net> Date: Fri, 1 May 2015 14:40:36 +0200 From: Paul Cercueil <paul@...pouillou.net> To: Bastien Nocera <hadess@...ess.net>, Dmitry Torokhov <dmitry.torokhov@...il.com> Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net> Subject: [PATCH v2] 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@...pouillou.net> --- v2: Fix commit message drivers/input/touchscreen/goodix.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index ca19668..9fa6c5f 100644 --- a/drivers/input/touchscreen/goodix.c +++ b/drivers/input/touchscreen/goodix.c @@ -98,6 +98,9 @@ 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 > GOODIX_MAX_CONTACTS) return -EPROTO; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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