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SubjectRe: [PATCH] input: goodix: Check the 'data ready' bit before reading data
Hi Bastien,

Ok, I will send a V2 with a better commit message then.

-Paul

Le 2015-04-25 14:54, Bastien Nocera a écrit :
> On Sat, 2015-04-25 at 12:48 +0200, Paul Cercueil wrote:
>> The MSB of the first byte read via I2C seems to indicate whether the
>> data is valid (or ready) when an interrupt is raised. Previously,
>> this
>> bit was ignored, which resulted in a lot of incorrect detections of
>> "finger removed" events.
>
> This seems correct, but the wording doesn't match the language used in
> the Goodix docs that were posted here some time ago[1].
>
> I would have written:
> The MSB of the first byte read via I2C at the coordinates address
> indicate 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.
>
> And for the commit subject:
> input: goodix: Check the 'buffer status' bit before reading data
>
> This seems correct otherwise.
>
> Signed-off-by: Bastien Nocera <hadess@hadess.net>
>
> with the fixed commit message/subject
>
> [1]: Linked from the device tree support patch:
> https://patchwork.ozlabs.org/patch/446838/
> Page 16, table c, 0x814E is what we read for coordinates
>
>> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>> ---
>> 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;


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