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[media] usbtv: add video controls 

Brightness, Contrast, Hue and Color Saturation are supported.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Lubomir Rintel 2016-10-16 07:38:22 -02:00 committed by Mauro Carvalho Chehab
parent 6b2bed8912
commit c53a846c48
2 changed files with 99 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
drivers/media/usb/usbtv/usbtv-video.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2013 Lubomir Rintel
* Copyright (c) 2013,2016 Lubomir Rintel
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -259,6 +259,10 @@ static int usbtv_setup_capture(struct usbtv *usbtv)
if (ret)
return ret;
ret = v4l2_ctrl_handler_setup(&usbtv->ctrl);
if (ret)
return ret;
return 0;
}
@ -696,11 +700,83 @@ static const struct vb2_ops usbtv_vb2_ops = {
.stop_streaming = usbtv_stop_streaming,
};
static int usbtv_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct usbtv *usbtv = container_of(ctrl->handler, struct usbtv,
ctrl);
u8 data[3];
u16 index, size;
int ret;
/*
* Read in the current brightness/contrast registers. We need them
* both, because the values are for some reason interleaved.
*/
if (ctrl->id == V4L2_CID_BRIGHTNESS || ctrl->id == V4L2_CID_CONTRAST) {
ret = usb_control_msg(usbtv->udev,
usb_sndctrlpipe(usbtv->udev, 0), USBTV_CONTROL_REG,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, USBTV_BASE + 0x0244, (void *)data, 3, 0);
}
switch (ctrl->id) {
case V4L2_CID_BRIGHTNESS:
index = USBTV_BASE + 0x0244;
size = 3;
data[0] &= 0xf0;
data[0] |= (ctrl->val >> 8) & 0xf;
data[2] = ctrl->val & 0xff;
break;
case V4L2_CID_CONTRAST:
index = USBTV_BASE + 0x0244;
size = 3;
data[0] &= 0x0f;
data[0] |= (ctrl->val >> 4) & 0xf0;
data[1] = ctrl->val & 0xff;
break;
case V4L2_CID_SATURATION:
index = USBTV_BASE + 0x0242;
data[0] = ctrl->val >> 8;
data[1] = ctrl->val & 0xff;
size = 2;
break;
case V4L2_CID_HUE:
index = USBTV_BASE + 0x0240;
size = 2;
if (ctrl->val > 0) {
data[0] = 0x92 + (ctrl->val >> 8);
data[1] = ctrl->val & 0xff;
} else {
data[0] = 0x82 + (-ctrl->val >> 8);
data[1] = -ctrl->val & 0xff;
}
break;
default:
return -EINVAL;
}
ret = usb_control_msg(usbtv->udev, usb_sndctrlpipe(usbtv->udev, 0),
USBTV_CONTROL_REG,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, index, (void *)data, size, 0);
if (ret < 0) {
dev_warn(usbtv->dev, "Failed to submit a control request.\n");
return ret;
}
return 0;
}
static const struct v4l2_ctrl_ops usbtv_ctrl_ops = {
.s_ctrl = usbtv_s_ctrl,
};
static void usbtv_release(struct v4l2_device *v4l2_dev)
{
struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev);
v4l2_device_unregister(&usbtv->v4l2_dev);
v4l2_ctrl_handler_free(&usbtv->ctrl);
vb2_queue_release(&usbtv->vb2q);
kfree(usbtv);
}
@ -731,7 +807,24 @@ int usbtv_video_init(struct usbtv *usbtv)
return ret;
}
/* controls */
v4l2_ctrl_handler_init(&usbtv->ctrl, 4);
v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
V4L2_CID_CONTRAST, 0, 0x3ff, 1, 0x1d0);
v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
V4L2_CID_BRIGHTNESS, 0, 0x3ff, 1, 0x1c0);
v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
V4L2_CID_SATURATION, 0, 0x3ff, 1, 0x200);
v4l2_ctrl_new_std(&usbtv->ctrl, &usbtv_ctrl_ops,
V4L2_CID_HUE, -0xdff, 0xdff, 1, 0x000);
ret = usbtv->ctrl.error;
if (ret < 0) {
dev_warn(usbtv->dev, "Could not initialize controls\n");
goto ctrl_fail;
}
/* v4l2 structure */
usbtv->v4l2_dev.ctrl_handler = &usbtv->ctrl;
usbtv->v4l2_dev.release = usbtv_release;
ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
if (ret < 0) {
@ -760,6 +853,8 @@ int usbtv_video_init(struct usbtv *usbtv)
vdev_fail:
v4l2_device_unregister(&usbtv->v4l2_dev);
v4l2_fail:
ctrl_fail:
v4l2_ctrl_handler_free(&usbtv->ctrl);
vb2_queue_release(&usbtv->vb2q);
return ret;

3
drivers/media/usb/usbtv/usbtv.h
View File

@ -38,6 +38,7 @@
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>
@ -45,6 +46,7 @@
#define USBTV_VIDEO_ENDP 0x81
#define USBTV_AUDIO_ENDP 0x83
#define USBTV_BASE 0xc000
#define USBTV_CONTROL_REG 11
#define USBTV_REQUEST_REG 12
/* Number of concurrent isochronous urbs submitted.
@ -87,6 +89,7 @@ struct usbtv {
/* video */
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler ctrl;
struct video_device vdev;
struct vb2_queue vb2q;
struct mutex v4l2_lock;