Re: [PATCH v6 11/11] Input: sur40 - use new V4L2 touch input type

From: Pavel Machek
Date: Fri Aug 05 2016 - 09:41:47 EST

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On Thu 2016-06-30 18:38:54, Nick Dyer wrote:
> Support both V4L2_TCH_FMT_TU08 and V4L2_PIX_FMT_GREY for backwards
> compatibility.
>
> Note: I have not tested these changes (I have no access to the hardware)
> so not signing off.

Sign off means something else, see docs... and sign patches off :-).

Pavel
> ---
> drivers/input/touchscreen/sur40.c | 121 +++++++++++++++++++++++++++-----------
> 1 file changed, 88 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
> index 880c40b..9ba68cf 100644
> --- a/drivers/input/touchscreen/sur40.c
> +++ b/drivers/input/touchscreen/sur40.c
> @@ -139,6 +139,27 @@ struct sur40_image_header {
> #define SUR40_GET_STATE 0xc5 /* 4 bytes state (?) */
> #define SUR40_GET_SENSORS 0xb1 /* 8 bytes sensors */
>
> +static const struct v4l2_pix_format sur40_pix_format[] = {
> + {
> + .pixelformat = V4L2_TCH_FMT_TU08,
> + .width = SENSOR_RES_X / 2,
> + .height = SENSOR_RES_Y / 2,
> + .field = V4L2_FIELD_NONE,
> + .colorspace = V4L2_COLORSPACE_SRGB,
> + .bytesperline = SENSOR_RES_X / 2,
> + .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
> + },
> + {
> + .pixelformat = V4L2_PIX_FMT_GREY,
> + .width = SENSOR_RES_X / 2,
> + .height = SENSOR_RES_Y / 2,
> + .field = V4L2_FIELD_NONE,
> + .colorspace = V4L2_COLORSPACE_SRGB,
> + .bytesperline = SENSOR_RES_X / 2,
> + .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
> + }
> +};
> +
> /* master device state */
> struct sur40_state {
>
> @@ -149,6 +170,7 @@ struct sur40_state {
> struct v4l2_device v4l2;
> struct video_device vdev;
> struct mutex lock;
> + struct v4l2_pix_format pix_fmt;
>
> struct vb2_queue queue;
> struct vb2_alloc_ctx *alloc_ctx;
> @@ -170,7 +192,6 @@ struct sur40_buffer {
>
> /* forward declarations */
> static const struct video_device sur40_video_device;
> -static const struct v4l2_pix_format sur40_video_format;
> static const struct vb2_queue sur40_queue;
> static void sur40_process_video(struct sur40_state *sur40);
>
> @@ -421,7 +442,7 @@ static void sur40_process_video(struct sur40_state *sur40)
> goto err_poll;
> }
>
> - if (le32_to_cpu(img->size) != sur40_video_format.sizeimage) {
> + if (le32_to_cpu(img->size) != sur40->pix_fmt.sizeimage) {
> dev_err(sur40->dev, "image size mismatch\n");
> goto err_poll;
> }
> @@ -432,7 +453,7 @@ static void sur40_process_video(struct sur40_state *sur40)
>
> result = usb_sg_init(&sgr, sur40->usbdev,
> usb_rcvbulkpipe(sur40->usbdev, VIDEO_ENDPOINT), 0,
> - sgt->sgl, sgt->nents, sur40_video_format.sizeimage, 0);
> + sgt->sgl, sgt->nents, sur40->pix_fmt.sizeimage, 0);
> if (result < 0) {
> dev_err(sur40->dev, "error %d in usb_sg_init\n", result);
> goto err_poll;
> @@ -593,13 +614,14 @@ static int sur40_probe(struct usb_interface *interface,
> goto err_unreg_v4l2;
> }
>
> + sur40->pix_fmt = sur40_pix_format[0];
> sur40->vdev = sur40_video_device;
> sur40->vdev.v4l2_dev = &sur40->v4l2;
> sur40->vdev.lock = &sur40->lock;
> sur40->vdev.queue = &sur40->queue;
> video_set_drvdata(&sur40->vdev, sur40);
>
> - error = video_register_device(&sur40->vdev, VFL_TYPE_GRABBER, -1);
> + error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
> if (error) {
> dev_err(&interface->dev,
> "Unable to register video subdevice.");
> @@ -662,10 +684,10 @@ static int sur40_queue_setup(struct vb2_queue *q,
> alloc_ctxs[0] = sur40->alloc_ctx;
>
> if (*nplanes)
> - return sizes[0] < sur40_video_format.sizeimage ? -EINVAL : 0;
> + return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
>
> *nplanes = 1;
> - sizes[0] = sur40_video_format.sizeimage;
> + sizes[0] = sur40->pix_fmt.sizeimage;
>
> return 0;
> }
> @@ -677,7 +699,7 @@ static int sur40_queue_setup(struct vb2_queue *q,
> static int sur40_buffer_prepare(struct vb2_buffer *vb)
> {
> struct sur40_state *sur40 = vb2_get_drv_priv(vb->vb2_queue);
> - unsigned long size = sur40_video_format.sizeimage;
> + unsigned long size = sur40->pix_fmt.sizeimage;
>
> if (vb2_plane_size(vb, 0) < size) {
> dev_err(&sur40->usbdev->dev, "buffer too small (%lu < %lu)\n",
> @@ -751,7 +773,7 @@ static int sur40_vidioc_querycap(struct file *file, void *priv,
> strlcpy(cap->driver, DRIVER_SHORT, sizeof(cap->driver));
> strlcpy(cap->card, DRIVER_LONG, sizeof(cap->card));
> usb_make_path(sur40->usbdev, cap->bus_info, sizeof(cap->bus_info));
> - cap->device_caps = V4L2_CAP_VIDEO_CAPTURE |
> + cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
> V4L2_CAP_READWRITE |
> V4L2_CAP_STREAMING;
> cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
> @@ -763,7 +785,7 @@ static int sur40_vidioc_enum_input(struct file *file, void *priv,
> {
> if (i->index != 0)
> return -EINVAL;
> - i->type = V4L2_INPUT_TYPE_CAMERA;
> + i->type = V4L2_INPUT_TYPE_TOUCH;
> i->std = V4L2_STD_UNKNOWN;
> strlcpy(i->name, "In-Cell Sensor", sizeof(i->name));
> i->capabilities = 0;
> @@ -781,20 +803,57 @@ static int sur40_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
> return 0;
> }
>
> -static int sur40_vidioc_fmt(struct file *file, void *priv,
> +static int sur40_vidioc_try_fmt(struct file *file, void *priv,
> struct v4l2_format *f)
> {
> - f->fmt.pix = sur40_video_format;
> + switch (f->fmt.pix.pixelformat) {
> + case V4L2_PIX_FMT_GREY:
> + f->fmt.pix = sur40_pix_format[1];
> + break;
> +
> + default:
> + f->fmt.pix = sur40_pix_format[0];
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int sur40_vidioc_s_fmt(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct sur40_state *sur40 = video_drvdata(file);
> +
> + switch (f->fmt.pix.pixelformat) {
> + case V4L2_PIX_FMT_GREY:
> + sur40->pix_fmt = sur40_pix_format[1];
> + break;
> +
> + default:
> + sur40->pix_fmt = sur40_pix_format[0];
> + break;
> + }
> +
> + f->fmt.pix = sur40->pix_fmt;
> + return 0;
> +}
> +
> +static int sur40_vidioc_g_fmt(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct sur40_state *sur40 = video_drvdata(file);
> +
> + f->fmt.pix = sur40->pix_fmt;
> return 0;
> }
>
> static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
> struct v4l2_fmtdesc *f)
> {
> - if (f->index != 0)
> + if (f->index >= ARRAY_SIZE(sur40_pix_format))
> return -EINVAL;
> - strlcpy(f->description, "8-bit greyscale", sizeof(f->description));
> - f->pixelformat = V4L2_PIX_FMT_GREY;
> +
> + f->pixelformat = sur40_pix_format[f->index].pixelformat;
> f->flags = 0;
> return 0;
> }
> @@ -802,21 +861,27 @@ static int sur40_vidioc_enum_fmt(struct file *file, void *priv,
> static int sur40_vidioc_enum_framesizes(struct file *file, void *priv,
> struct v4l2_frmsizeenum *f)
> {
> - if ((f->index != 0) || (f->pixel_format != V4L2_PIX_FMT_GREY))
> + struct sur40_state *sur40 = video_drvdata(file);
> +
> + if ((f->index != 0) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
> + && (f->pixel_format != V4L2_PIX_FMT_GREY)))
> return -EINVAL;
>
> f->type = V4L2_FRMSIZE_TYPE_DISCRETE;
> - f->discrete.width = sur40_video_format.width;
> - f->discrete.height = sur40_video_format.height;
> + f->discrete.width = sur40->pix_fmt.width;
> + f->discrete.height = sur40->pix_fmt.height;
> return 0;
> }
>
> static int sur40_vidioc_enum_frameintervals(struct file *file, void *priv,
> struct v4l2_frmivalenum *f)
> {
> - if ((f->index > 1) || (f->pixel_format != V4L2_PIX_FMT_GREY)
> - || (f->width != sur40_video_format.width)
> - || (f->height != sur40_video_format.height))
> + struct sur40_state *sur40 = video_drvdata(file);
> +
> + if ((f->index > 1) || ((f->pixel_format != V4L2_TCH_FMT_TU08)
> + && (f->pixel_format != V4L2_PIX_FMT_GREY))
> + || (f->width != sur40->pix_fmt.width)
> + || (f->height != sur40->pix_fmt.height))
> return -EINVAL;
>
> f->type = V4L2_FRMIVAL_TYPE_DISCRETE;
> @@ -873,9 +938,9 @@ static const struct v4l2_ioctl_ops sur40_video_ioctl_ops = {
> .vidioc_querycap = sur40_vidioc_querycap,
>
> .vidioc_enum_fmt_vid_cap = sur40_vidioc_enum_fmt,
> - .vidioc_try_fmt_vid_cap = sur40_vidioc_fmt,
> - .vidioc_s_fmt_vid_cap = sur40_vidioc_fmt,
> - .vidioc_g_fmt_vid_cap = sur40_vidioc_fmt,
> + .vidioc_try_fmt_vid_cap = sur40_vidioc_try_fmt,
> + .vidioc_s_fmt_vid_cap = sur40_vidioc_s_fmt,
> + .vidioc_g_fmt_vid_cap = sur40_vidioc_g_fmt,
>
> .vidioc_enum_framesizes = sur40_vidioc_enum_framesizes,
> .vidioc_enum_frameintervals = sur40_vidioc_enum_frameintervals,
> @@ -902,16 +967,6 @@ static const struct video_device sur40_video_device = {
> .release = video_device_release_empty,
> };
>
> -static const struct v4l2_pix_format sur40_video_format = {
> - .pixelformat = V4L2_PIX_FMT_GREY,
> - .width = SENSOR_RES_X / 2,
> - .height = SENSOR_RES_Y / 2,
> - .field = V4L2_FIELD_NONE,
> - .colorspace = V4L2_COLORSPACE_SRGB,
> - .bytesperline = SENSOR_RES_X / 2,
> - .sizeimage = (SENSOR_RES_X/2) * (SENSOR_RES_Y/2),
> -};
> -
> /* USB-specific object needed to register this driver with the USB subsystem. */
> static struct usb_driver sur40_driver = {
> .name = DRIVER_SHORT,

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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