Hi Oleksij,
On Mon, Oct 26, 2020 at 02:21:17PM +0100, Oleksij Rempel wrote:
> From: David Jander <da...@protonic.nl>
>
> If touchscreen is released while busy reading HWMON device, the release
> can be missed. The IRQ thread is not started because no touch is active
> and BTN_TOUCH release event is never sent.
>
> Fixes: f5a28a7d4858f94a ("Input: ads7846 - avoid pen up/down when reading
> hwmon")
> Co-Developed-by: David Jander <da...@protonic.nl>
> Signed-off-by: David Jander <da...@protonic.nl>
> Signed-off-by: Oleksij Rempel <o.rem...@pengutronix.de>
> ---
> drivers/input/touchscreen/ads7846.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/input/touchscreen/ads7846.c
> b/drivers/input/touchscreen/ads7846.c
> index ea31956f3a90..0236a119c52d 100644
> --- a/drivers/input/touchscreen/ads7846.c
> +++ b/drivers/input/touchscreen/ads7846.c
> @@ -211,10 +211,26 @@ static void ads7846_stop(struct ads7846 *ts)
> }
> }
>
> +static int get_pendown_state(struct ads7846 *ts);
Not a fan forward declarations, just move the definition if needed.
> +
> /* Must be called with ts->lock held */
> static void ads7846_restart(struct ads7846 *ts)
> {
> + unsigned int pdstate;
I do not see it being used. Do you have more patches for the driver?
> +
> if (!ts->disabled && !ts->suspended) {
> + /* Check if pen was released since last stop */
> + if (ts->pendown && !get_pendown_state(ts)) {
> + struct input_dev *input = ts->input;
> +
> + input_report_key(input, BTN_TOUCH, 0);
> + input_report_abs(input, ABS_PRESSURE, 0);
> + input_sync(input);
> +
> + ts->pendown = false;
> + dev_vdbg(&ts->spi->dev, "UP\n");
I wonder if we should not have ads7846_report_pen_up(struct ads7846 *ts)
> + }
> +
> /* Tell IRQ thread that it may poll the device. */
> ts->stopped = false;
> mb();
> --
> 2.28.0
>
Thanks.
--
Dmitry
