On 02/05/2018 03:29 PM, Florian Echtler wrote:
> Signed-off-by: Florian Echtler <f...@butterbrot.org>
> ---
> drivers/input/touchscreen/sur40.c | 114
> ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 114 insertions(+)
>
> diff --git a/drivers/input/touchscreen/sur40.c
> b/drivers/input/touchscreen/sur40.c
> index 63c7264b..c4b7cf1 100644
> --- a/drivers/input/touchscreen/sur40.c
> +++ b/drivers/input/touchscreen/sur40.c
> @@ -953,6 +953,119 @@ static int sur40_vidioc_g_fmt(struct file *file, void
> *priv,
> return 0;
> }
>
> +
> +static int sur40_vidioc_queryctrl(struct file *file, void *fh,
> + struct v4l2_queryctrl *qc)
> +{
> +
> + switch (qc->id) {
> + case V4L2_CID_BRIGHTNESS:
> + qc->flags = 0;
> + sprintf(qc->name, "Brightness");
> + qc->type = V4L2_CTRL_TYPE_INTEGER;
> + qc->minimum = SUR40_BRIGHTNESS_MIN;
> + qc->default_value = SUR40_BRIGHTNESS_DEF;
> + qc->maximum = SUR40_BRIGHTNESS_MAX;
> + qc->step = 8;
> + return 0;
> + case V4L2_CID_CONTRAST:
> + qc->flags = 0;
> + sprintf(qc->name, "Contrast");
> + qc->type = V4L2_CTRL_TYPE_INTEGER;
> + qc->minimum = SUR40_CONTRAST_MIN;
> + qc->default_value = SUR40_CONTRAST_DEF;
> + qc->maximum = SUR40_CONTRAST_MAX;
> + qc->step = 1;
> + return 0;
> + case V4L2_CID_GAIN:
> + qc->flags = 0;
> + sprintf(qc->name, "Gain");
> + qc->type = V4L2_CTRL_TYPE_INTEGER;
> + qc->minimum = SUR40_GAIN_MIN;
> + qc->default_value = SUR40_GAIN_DEF;
> + qc->maximum = SUR40_GAIN_MAX;
> + qc->step = 1;
> + return 0;
> + case V4L2_CID_BACKLIGHT_COMPENSATION:
> + qc->flags = 0;
> + sprintf(qc->name, "Preprocessor");
> + qc->type = V4L2_CTRL_TYPE_INTEGER;
> + qc->minimum = SUR40_BACKLIGHT_MIN;
> + qc->default_value = SUR40_BACKLIGHT_DEF;
> + qc->maximum = SUR40_BACKLIGHT_MAX;
> + qc->step = 1;
> + return 0;
> + default:
> + qc->flags = V4L2_CTRL_FLAG_DISABLED;
> + return -EINVAL;
> + }
> +}
> +
> +static int sur40_vidioc_g_ctrl(struct file *file, void *fh,
> + struct v4l2_control *ctrl)
> +{
> +
> + switch (ctrl->id) {
> + case V4L2_CID_BRIGHTNESS:
> + ctrl->value = sur40_v4l2_brightness;
> + return 0;
> + case V4L2_CID_CONTRAST:
> + ctrl->value = sur40_v4l2_contrast;
> + return 0;
> + case V4L2_CID_GAIN:
> + ctrl->value = sur40_v4l2_gain;
> + return 0;
> + case V4L2_CID_BACKLIGHT_COMPENSATION:
> + ctrl->value = sur40_v4l2_backlight;
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int sur40_vidioc_s_ctrl(struct file *file, void *fh,
> + struct v4l2_control *ctrl)
> +{
> + u8 value = 0;
> + struct sur40_state *sur40 = video_drvdata(file);
> +
> + switch (ctrl->id) {
> + case V4L2_CID_BRIGHTNESS:
> + sur40_v4l2_brightness = ctrl->value;
> + if (sur40_v4l2_brightness < SUR40_BRIGHTNESS_MIN)
> + sur40_v4l2_brightness = SUR40_BRIGHTNESS_MIN;
> + else if (sur40_v4l2_brightness > SUR40_BRIGHTNESS_MAX)
> + sur40_v4l2_brightness = SUR40_BRIGHTNESS_MAX;
> + sur40_set_irlevel(sur40, sur40_v4l2_brightness);
> + return 0;
> + case V4L2_CID_CONTRAST:
> + sur40_v4l2_contrast = ctrl->value;
> + if (sur40_v4l2_contrast < SUR40_CONTRAST_MIN)
> + sur40_v4l2_contrast = SUR40_CONTRAST_MIN;
> + else if (sur40_v4l2_contrast > SUR40_CONTRAST_MAX)
> + sur40_v4l2_contrast = SUR40_CONTRAST_MAX;
> + value = (sur40_v4l2_contrast << 4) + sur40_v4l2_gain;
> + sur40_set_vsvideo(sur40, value);
> + return 0;
> + case V4L2_CID_GAIN:
> + sur40_v4l2_gain = ctrl->value;
> + if (sur40_v4l2_gain < SUR40_GAIN_MIN)
> + sur40_v4l2_gain = SUR40_GAIN_MIN;
> + else if (sur40_v4l2_gain > SUR40_GAIN_MAX)
> + sur40_v4l2_gain = SUR40_GAIN_MAX;
> + value = (sur40_v4l2_contrast << 4) + sur40_v4l2_gain;
> + sur40_set_vsvideo(sur40, value);
> + return 0;
> + case V4L2_CID_BACKLIGHT_COMPENSATION:
> + sur40_v4l2_backlight = ctrl->value;
> + sur40_set_preprocessor(sur40, sur40_v4l2_backlight);
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +
> static int sur40_ioctl_parm(struct file *file, void *priv,
> struct v4l2_streamparm *p)
> {
> @@ -1071,6 +1181,10 @@ static const struct v4l2_ioctl_ops
> sur40_video_ioctl_ops = {
> .vidioc_g_input = sur40_vidioc_g_input,
> .vidioc_s_input = sur40_vidioc_s_input,
>
> + .vidioc_queryctrl = sur40_vidioc_queryctrl,
> + .vidioc_g_ctrl = sur40_vidioc_g_ctrl,
> + .vidioc_s_ctrl = sur40_vidioc_s_ctrl,
> +
> .vidioc_reqbufs = vb2_ioctl_reqbufs,
> .vidioc_create_bufs = vb2_ioctl_create_bufs,
> .vidioc_querybuf = vb2_ioctl_querybuf,
>
Sorry, but this is very wrong. Use the control framework instead. See
https://hverkuil.home.xs4all.nl/spec/kapi/v4l2-controls.html and pretty much all
media drivers (with the exception of uvc). See for example this driver:
drivers/media/pci/tw68/tw68-video.c (randomly chosen).
It actually makes life a lot easier for you as you don't have to perform any
range checks and all control ioctls are automatically supported for you.
Regards,
Hans
