Re: [PATCH v5 1/9] [media] v4l2-core: Add support for touch devices

Nick Dyer
2016-06-24T13:48:32Z

On 22/06/2016 23:08, Nick Dyer wrote:
> Some touch controllers send out touch data in a similar way to a
> greyscale frame grabber.
>
> Use a new device prefix v4l-touch for these devices, to stop generic
> capture software from treating them as webcams.
>
> Add formats:
> - V4L2_TCH_FMT_DELTA_TD16 for signed 16-bit touch deltas
> - V4L2_TCH_FMT_DELTA_TD08 for signed 16-bit touch deltas
> - V4L2_TCH_FMT_TU16 for unsigned 16-bit touch data
> - V4L2_TCH_FMT_TU08 for unsigned 8-bit touch data
>
> This support will be used by:
> * Atmel maXTouch (atmel_mxt_ts)
> * Synaptics RMI4.
> * sur40
>
> Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
> ---
[...]
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 8f95191..7e19782 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -143,6 +143,7 @@ enum v4l2_buf_type {
> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE = 10,
> V4L2_BUF_TYPE_SDR_CAPTURE = 11,
> V4L2_BUF_TYPE_SDR_OUTPUT = 12,
> + V4L2_BUF_TYPE_TOUCH_CAPTURE = 13,
> /* Deprecated, do not use */
> V4L2_BUF_TYPE_PRIVATE = 0x80,
> };
> @@ -440,6 +441,8 @@ struct v4l2_capability {
> #define V4L2_CAP_ASYNCIO 0x02000000 /* async I/O */
> #define V4L2_CAP_STREAMING 0x04000000 /* streaming I/O ioctls */
>
> +#define V4L2_CAP_TOUCH 0x00100000 /* Is a touch device */

Apologies, this should have been
#define V4L2_CAP_TOUCH 0x10000000

You will find my changes to v4l2-compliance to support these changes here:
https://github.com/ndyer/v4l-utils

I've tested the atmel_mxt_ts version of this with v4l2-compliance on Pixel 2.