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media: add video control handlers using V4L2 control framework 

This patch registers four standard control handlers using the corresponding
V4L2 framework.

Signed-off-by: Florian Echtler <floe@butterbrot.org>
[hans.verkuil@cisco.com: lower-cased 0x0F and 0xF0]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Florian Echtler 2018-02-08 03:43:06 -05:00 committed by Mauro Carvalho Chehab
parent bbc0c4eb6b
commit cee1e3e2ef
1 changed files with 64 additions and 0 deletions
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64
drivers/input/touchscreen/sur40.c
View File

@ -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>
@ -215,6 +216,7 @@ struct sur40_state {
struct video_device vdev;
struct mutex lock;
struct v4l2_pix_format pix_fmt;
struct v4l2_ctrl_handler hdl;
struct vb2_queue queue;
struct list_head buf_list;
@ -224,6 +226,7 @@ struct sur40_state {
struct sur40_data *bulk_in_buffer;
size_t bulk_in_size;
u8 bulk_in_epaddr;
u8 vsvideo;
char phys[64];
};
@ -237,6 +240,11 @@ 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
@ -743,6 +751,36 @@ 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->hdl, 4);
sur40->v4l2.ctrl_handler = &sur40->hdl;
sur40->vsvideo = (SUR40_CONTRAST_DEF << 4) | SUR40_GAIN_DEF;
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_BRIGHTNESS,
SUR40_BRIGHTNESS_MIN, SUR40_BRIGHTNESS_MAX, 1, clamp(brightness,
(uint)SUR40_BRIGHTNESS_MIN, (uint)SUR40_BRIGHTNESS_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_CONTRAST,
SUR40_CONTRAST_MIN, SUR40_CONTRAST_MAX, 1, clamp(contrast,
(uint)SUR40_CONTRAST_MIN, (uint)SUR40_CONTRAST_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops, V4L2_CID_GAIN,
SUR40_GAIN_MIN, SUR40_GAIN_MAX, 1, clamp(gain,
(uint)SUR40_GAIN_MIN, (uint)SUR40_GAIN_MAX));
v4l2_ctrl_new_std(&sur40->hdl, &sur40_ctrl_ops,
V4L2_CID_BACKLIGHT_COMPENSATION, SUR40_BACKLIGHT_MIN,
SUR40_BACKLIGHT_MAX, 1, SUR40_BACKLIGHT_DEF);
v4l2_ctrl_handler_setup(&sur40->hdl);
if (sur40->hdl.error) {
dev_err(&interface->dev,
"Unable to register video controls.");
v4l2_ctrl_handler_free(&sur40->hdl);
goto err_unreg_v4l2;
}
error = video_register_device(&sur40->vdev, VFL_TYPE_TOUCH, -1);
if (error) {
dev_err(&interface->dev,
@ -775,6 +813,7 @@ static void sur40_disconnect(struct usb_interface *interface)
{
struct sur40_state *sur40 = usb_get_intfdata(interface);
v4l2_ctrl_handler_free(&sur40->hdl);
video_unregister_device(&sur40->vdev);
v4l2_device_unregister(&sur40->v4l2);
@ -968,6 +1007,31 @@ 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, hdl);
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)
{