On 02/06/2018 10:01 PM, Florian Echtler wrote:
> This patch registers four standard control handlers using the corresponding
> V4L2 framework.
>
> Signed-off-by: Florian Echtler <f...@butterbrot.org>
> ---
> drivers/input/touchscreen/sur40.c | 51
> +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 51 insertions(+)
>
> diff --git a/drivers/input/touchscreen/sur40.c
> b/drivers/input/touchscreen/sur40.c
> index 7f6461d..66ef7e6 100644
> --- a/drivers/input/touchscreen/sur40.c
> +++ b/drivers/input/touchscreen/sur40.c
> @@ -38,6 +38,7 @@
> #include <media/v4l2-device.h>
> #include <media/v4l2-dev.h>
> #include <media/v4l2-ioctl.h>
> +#include <media/v4l2-ctrls.h>
> #include <media/videobuf2-v4l2.h>
> #include <media/videobuf2-dma-sg.h>
>
> @@ -198,6 +199,7 @@ struct sur40_state {
> struct video_device vdev;
> struct mutex lock;
> struct v4l2_pix_format pix_fmt;
> + struct v4l2_ctrl_handler ctrls;
This is normally called 'hdl' or 'ctrl_handler'.
>
> struct vb2_queue queue;
> struct list_head buf_list;
> @@ -207,6 +209,7 @@ struct sur40_state {
> struct sur40_data *bulk_in_buffer;
> size_t bulk_in_size;
> u8 bulk_in_epaddr;
> + u8 vsvideo;
>
> char phys[64];
> };
> @@ -220,6 +223,11 @@ struct sur40_buffer {
> static const struct video_device sur40_video_device;
> static const struct vb2_queue sur40_queue;
> static void sur40_process_video(struct sur40_state *sur40);
> +static int sur40_s_ctrl(struct v4l2_ctrl *ctrl);
> +
> +static const struct v4l2_ctrl_ops sur40_ctrl_ops = {
> + .s_ctrl = sur40_s_ctrl,
> +};
>
> /*
> * Note: an earlier, non-public version of this driver used
> USB_RECIP_ENDPOINT
> @@ -722,6 +730,23 @@ static int sur40_probe(struct usb_interface *interface,
> sur40->vdev.queue = &sur40->queue;
> video_set_drvdata(&sur40->vdev, sur40);
>
> + /* initialize the control handler for 4 controls */
> + v4l2_ctrl_handler_init(&sur40->ctrls, 4);
> + sur40->v4l2.ctrl_handler = &sur40->ctrls;
> +
> + v4l2_ctrl_new_std(&sur40->ctrls, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
> + SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, SUR40_BRIGHTNESS_DEF);
> +
> + v4l2_ctrl_new_std(&sur40->ctrls, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
> + SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, SUR40_CONTRAST_DEF);
> +
> + v4l2_ctrl_new_std(&sur40->ctrls, &sur40_ctrl_ops, V4L2_CID_GAIN,
> + SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, SUR40_GAIN_DEF);
> +
> + v4l2_ctrl_new_std(&sur40->ctrls, &sur40_ctrl_ops,
> + V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
> + SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
You need to check if the creation succeeded:
if (ctrls->error) {
v4l2_ctrl_handler_free(ctrls);
// exit
}
> +
> error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
> if (error) {
> dev_err(&interface->dev,
> @@ -754,6 +779,7 @@ static void sur40_disconnect(struct usb_interface
> *interface)
> {
> struct sur40_state *sur40 = usb_get_intfdata(interface);
>
> + v4l2_ctrl_handler_free(&sur40->ctrls);
> video_unregister_device(&sur40->vdev);
> v4l2_device_unregister(&sur40->v4l2);
>
> @@ -947,6 +973,31 @@ static int sur40_vidioc_g_fmt(struct file *file, void
> *priv,
> return 0;
> }
>
> +static int sur40_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct sur40_state *sur40 = container_of(ctrl->handler,
> + struct sur40_state, ctrls);
> + u8 value = sur40->vsvideo;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_BRIGHTNESS:
> + sur40_set_irlevel(sur40, ctrl->val);
> + break;
> + case V4L2_CID_CONTRAST:
> + value = (value & 0x0F) | (ctrl->val << 4);
> + sur40_set_vsvideo(sur40, value);
> + break;
> + case V4L2_CID_GAIN:
> + value = (value & 0xF0) | (ctrl->val);
> + sur40_set_vsvideo(sur40, value);
> + break;
> + case V4L2_CID_BACKLIGHT_COMPENSATION:
> + sur40_set_preprocessor(sur40, ctrl->val);
> + break;
> + }
> + return 0;
> +}
> +
> static int sur40_ioctl_parm(struct file *file, void *priv,
> struct v4l2_streamparm *p)
> {
>
Looks good otherwise.
Hans
