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OpenCloudOS-Kernel/drivers/media/usb/usbtv/usbtv-video.c

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/*
* Fushicai USBTV007 Video Grabber Driver
*
* Product web site:
* http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
*
* Following LWN articles were very useful in construction of this driver:
* Video4Linux2 API series: http://lwn.net/Articles/203924/
* videobuf2 API explanation: http://lwn.net/Articles/447435/
* Thanks go to Jonathan Corbet for providing this quality documentation.
* He is awesome.
*
* Copyright (c) 2013 Lubomir Rintel
* All rights reserved.
* No physical hardware was harmed running Windows during the
* reverse-engineering activity
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL").
*/
#include <media/v4l2-ioctl.h>
#include <media/videobuf2-core.h>
#include "usbtv.h"
static struct usbtv_norm_params norm_params[] = {
{
.norm = V4L2_STD_525_60,
.cap_width = 720,
.cap_height = 480,
},
{
.norm = V4L2_STD_PAL,
.cap_width = 720,
.cap_height = 576,
}
};
static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm)
{
int i, ret = 0;
struct usbtv_norm_params *params = NULL;
for (i = 0; i < ARRAY_SIZE(norm_params); i++) {
if (norm_params[i].norm & norm) {
params = &norm_params[i];
break;
}
}
if (params) {
usbtv->width = params->cap_width;
usbtv->height = params->cap_height;
usbtv->n_chunks = usbtv->width * usbtv->height
/ 4 / USBTV_CHUNK;
usbtv->norm = params->norm;
} else
ret = -EINVAL;
return ret;
}
static int usbtv_select_input(struct usbtv *usbtv, int input)
{
int ret;
static const u16 composite[][2] = {
{ USBTV_BASE + 0x0105, 0x0060 },
{ USBTV_BASE + 0x011f, 0x00f2 },
{ USBTV_BASE + 0x0127, 0x0060 },
{ USBTV_BASE + 0x00ae, 0x0010 },
{ USBTV_BASE + 0x0284, 0x00aa },
{ USBTV_BASE + 0x0239, 0x0060 },
};
static const u16 svideo[][2] = {
{ USBTV_BASE + 0x0105, 0x0010 },
{ USBTV_BASE + 0x011f, 0x00ff },
{ USBTV_BASE + 0x0127, 0x0060 },
{ USBTV_BASE + 0x00ae, 0x0030 },
{ USBTV_BASE + 0x0284, 0x0088 },
{ USBTV_BASE + 0x0239, 0x0060 },
};
switch (input) {
case USBTV_COMPOSITE_INPUT:
ret = usbtv_set_regs(usbtv, composite, ARRAY_SIZE(composite));
break;
case USBTV_SVIDEO_INPUT:
ret = usbtv_set_regs(usbtv, svideo, ARRAY_SIZE(svideo));
break;
default:
ret = -EINVAL;
}
if (!ret)
usbtv->input = input;
return ret;
}
static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm)
{
int ret;
static const u16 pal[][2] = {
{ USBTV_BASE + 0x001a, 0x0068 },
{ USBTV_BASE + 0x010e, 0x0072 },
{ USBTV_BASE + 0x010f, 0x00a2 },
{ USBTV_BASE + 0x0112, 0x00b0 },
{ USBTV_BASE + 0x0117, 0x0001 },
{ USBTV_BASE + 0x0118, 0x002c },
{ USBTV_BASE + 0x012d, 0x0010 },
{ USBTV_BASE + 0x012f, 0x0020 },
{ USBTV_BASE + 0x024f, 0x0002 },
{ USBTV_BASE + 0x0254, 0x0059 },
{ USBTV_BASE + 0x025a, 0x0016 },
{ USBTV_BASE + 0x025b, 0x0035 },
{ USBTV_BASE + 0x0263, 0x0017 },
{ USBTV_BASE + 0x0266, 0x0016 },
{ USBTV_BASE + 0x0267, 0x0036 }
};
static const u16 ntsc[][2] = {
{ USBTV_BASE + 0x001a, 0x0079 },
{ USBTV_BASE + 0x010e, 0x0068 },
{ USBTV_BASE + 0x010f, 0x009c },
{ USBTV_BASE + 0x0112, 0x00f0 },
{ USBTV_BASE + 0x0117, 0x0000 },
{ USBTV_BASE + 0x0118, 0x00fc },
{ USBTV_BASE + 0x012d, 0x0004 },
{ USBTV_BASE + 0x012f, 0x0008 },
{ USBTV_BASE + 0x024f, 0x0001 },
{ USBTV_BASE + 0x0254, 0x005f },
{ USBTV_BASE + 0x025a, 0x0012 },
{ USBTV_BASE + 0x025b, 0x0001 },
{ USBTV_BASE + 0x0263, 0x001c },
{ USBTV_BASE + 0x0266, 0x0011 },
{ USBTV_BASE + 0x0267, 0x0005 }
};
ret = usbtv_configure_for_norm(usbtv, norm);
if (!ret) {
if (norm & V4L2_STD_525_60)
ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc));
else if (norm & V4L2_STD_PAL)
ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal));
}
return ret;
}
static int usbtv_setup_capture(struct usbtv *usbtv)
{
int ret;
static const u16 setup[][2] = {
/* These seem to enable the device. */
{ USBTV_BASE + 0x0008, 0x0001 },
{ USBTV_BASE + 0x01d0, 0x00ff },
{ USBTV_BASE + 0x01d9, 0x0002 },
/* These seem to influence color parameters, such as
* brightness, etc. */
{ USBTV_BASE + 0x0239, 0x0040 },
{ USBTV_BASE + 0x0240, 0x0000 },
{ USBTV_BASE + 0x0241, 0x0000 },
{ USBTV_BASE + 0x0242, 0x0002 },
{ USBTV_BASE + 0x0243, 0x0080 },
{ USBTV_BASE + 0x0244, 0x0012 },
{ USBTV_BASE + 0x0245, 0x0090 },
{ USBTV_BASE + 0x0246, 0x0000 },
{ USBTV_BASE + 0x0278, 0x002d },
{ USBTV_BASE + 0x0279, 0x000a },
{ USBTV_BASE + 0x027a, 0x0032 },
{ 0xf890, 0x000c },
{ 0xf894, 0x0086 },
{ USBTV_BASE + 0x00ac, 0x00c0 },
{ USBTV_BASE + 0x00ad, 0x0000 },
{ USBTV_BASE + 0x00a2, 0x0012 },
{ USBTV_BASE + 0x00a3, 0x00e0 },
{ USBTV_BASE + 0x00a4, 0x0028 },
{ USBTV_BASE + 0x00a5, 0x0082 },
{ USBTV_BASE + 0x00a7, 0x0080 },
{ USBTV_BASE + 0x0000, 0x0014 },
{ USBTV_BASE + 0x0006, 0x0003 },
{ USBTV_BASE + 0x0090, 0x0099 },
{ USBTV_BASE + 0x0091, 0x0090 },
{ USBTV_BASE + 0x0094, 0x0068 },
{ USBTV_BASE + 0x0095, 0x0070 },
{ USBTV_BASE + 0x009c, 0x0030 },
{ USBTV_BASE + 0x009d, 0x00c0 },
{ USBTV_BASE + 0x009e, 0x00e0 },
{ USBTV_BASE + 0x0019, 0x0006 },
{ USBTV_BASE + 0x008c, 0x00ba },
{ USBTV_BASE + 0x0101, 0x00ff },
{ USBTV_BASE + 0x010c, 0x00b3 },
{ USBTV_BASE + 0x01b2, 0x0080 },
{ USBTV_BASE + 0x01b4, 0x00a0 },
{ USBTV_BASE + 0x014c, 0x00ff },
{ USBTV_BASE + 0x014d, 0x00ca },
{ USBTV_BASE + 0x0113, 0x0053 },
{ USBTV_BASE + 0x0119, 0x008a },
{ USBTV_BASE + 0x013c, 0x0003 },
{ USBTV_BASE + 0x0150, 0x009c },
{ USBTV_BASE + 0x0151, 0x0071 },
{ USBTV_BASE + 0x0152, 0x00c6 },
{ USBTV_BASE + 0x0153, 0x0084 },
{ USBTV_BASE + 0x0154, 0x00bc },
{ USBTV_BASE + 0x0155, 0x00a0 },
{ USBTV_BASE + 0x0156, 0x00a0 },
{ USBTV_BASE + 0x0157, 0x009c },
{ USBTV_BASE + 0x0158, 0x001f },
{ USBTV_BASE + 0x0159, 0x0006 },
{ USBTV_BASE + 0x015d, 0x0000 },
{ USBTV_BASE + 0x0284, 0x0088 },
{ USBTV_BASE + 0x0003, 0x0004 },
{ USBTV_BASE + 0x0100, 0x00d3 },
{ USBTV_BASE + 0x0115, 0x0015 },
{ USBTV_BASE + 0x0220, 0x002e },
{ USBTV_BASE + 0x0225, 0x0008 },
{ USBTV_BASE + 0x024e, 0x0002 },
{ USBTV_BASE + 0x024e, 0x0002 },
{ USBTV_BASE + 0x024f, 0x0002 },
};
ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup));
if (ret)
return ret;
ret = usbtv_select_norm(usbtv, usbtv->norm);
if (ret)
return ret;
ret = usbtv_select_input(usbtv, usbtv->input);
if (ret)
return ret;
return 0;
}
/* Copy data from chunk into a frame buffer, deinterlacing the data
* into every second line. Unfortunately, they don't align nicely into
* 720 pixel lines, as the chunk is 240 words long, which is 480 pixels.
* Therefore, we break down the chunk into two halves before copyting,
* so that we can interleave a line if needed. */
static void usbtv_chunk_to_vbuf(u32 *frame, u32 *src, int chunk_no, int odd)
{
int half;
for (half = 0; half < 2; half++) {
int part_no = chunk_no * 2 + half;
int line = part_no / 3;
int part_index = (line * 2 + !odd) * 3 + (part_no % 3);
u32 *dst = &frame[part_index * USBTV_CHUNK/2];
memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src));
src += USBTV_CHUNK/2;
}
}
/* Called for each 256-byte image chunk.
* First word identifies the chunk, followed by 240 words of image
* data and padding. */
static void usbtv_image_chunk(struct usbtv *usbtv, u32 *chunk)
{
int frame_id, odd, chunk_no;
u32 *frame;
struct usbtv_buf *buf;
unsigned long flags;
/* Ignore corrupted lines. */
if (!USBTV_MAGIC_OK(chunk))
return;
frame_id = USBTV_FRAME_ID(chunk);
odd = USBTV_ODD(chunk);
chunk_no = USBTV_CHUNK_NO(chunk);
if (chunk_no >= usbtv->n_chunks)
return;
/* Beginning of a frame. */
if (chunk_no == 0) {
usbtv->frame_id = frame_id;
usbtv->chunks_done = 0;
}
if (usbtv->frame_id != frame_id)
return;
spin_lock_irqsave(&usbtv->buflock, flags);
if (list_empty(&usbtv->bufs)) {
/* No free buffers. Userspace likely too slow. */
spin_unlock_irqrestore(&usbtv->buflock, flags);
return;
}
/* First available buffer. */
buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list);
frame = vb2_plane_vaddr(&buf->vb, 0);
/* Copy the chunk data. */
usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd);
usbtv->chunks_done++;
/* Last chunk in a frame, signalling an end */
if (odd && chunk_no == usbtv->n_chunks-1) {
int size = vb2_plane_size(&buf->vb, 0);
enum vb2_buffer_state state = usbtv->chunks_done ==
usbtv->n_chunks ?
VB2_BUF_STATE_DONE :
VB2_BUF_STATE_ERROR;
buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
buf->vb.v4l2_buf.sequence = usbtv->sequence++;
v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);
vb2_set_plane_payload(&buf->vb, 0, size);
vb2_buffer_done(&buf->vb, state);
list_del(&buf->list);
}
spin_unlock_irqrestore(&usbtv->buflock, flags);
}
/* Got image data. Each packet contains a number of 256-word chunks we
* compose the image from. */
static void usbtv_iso_cb(struct urb *ip)
{
int ret;
int i;
struct usbtv *usbtv = (struct usbtv *)ip->context;
switch (ip->status) {
/* All fine. */
case 0:
break;
/* Device disconnected or capture stopped? */
case -ENODEV:
case -ENOENT:
case -ECONNRESET:
case -ESHUTDOWN:
return;
/* Unknown error. Retry. */
default:
dev_warn(usbtv->dev, "Bad response for ISO request.\n");
goto resubmit;
}
for (i = 0; i < ip->number_of_packets; i++) {
int size = ip->iso_frame_desc[i].actual_length;
unsigned char *data = ip->transfer_buffer +
ip->iso_frame_desc[i].offset;
int offset;
for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++)
usbtv_image_chunk(usbtv,
(u32 *)&data[USBTV_CHUNK_SIZE * offset]);
}
resubmit:
ret = usb_submit_urb(ip, GFP_ATOMIC);
if (ret < 0)
dev_warn(usbtv->dev, "Could not resubmit ISO URB\n");
}
static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv)
{
struct urb *ip;
int size = usbtv->iso_size;
int i;
ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL);
if (ip == NULL)
return NULL;
ip->dev = usbtv->udev;
ip->context = usbtv;
ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP);
ip->interval = 1;
ip->transfer_flags = URB_ISO_ASAP;
ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS,
GFP_KERNEL);
ip->complete = usbtv_iso_cb;
ip->number_of_packets = USBTV_ISOC_PACKETS;
ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS;
for (i = 0; i < USBTV_ISOC_PACKETS; i++) {
ip->iso_frame_desc[i].offset = size * i;
ip->iso_frame_desc[i].length = size;
}
return ip;
}
static void usbtv_stop(struct usbtv *usbtv)
{
int i;
unsigned long flags;
/* Cancel running transfers. */
for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
struct urb *ip = usbtv->isoc_urbs[i];
if (ip == NULL)
continue;
usb_kill_urb(ip);
kfree(ip->transfer_buffer);
usb_free_urb(ip);
usbtv->isoc_urbs[i] = NULL;
}
/* Return buffers to userspace. */
spin_lock_irqsave(&usbtv->buflock, flags);
while (!list_empty(&usbtv->bufs)) {
struct usbtv_buf *buf = list_first_entry(&usbtv->bufs,
struct usbtv_buf, list);
vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
list_del(&buf->list);
}
spin_unlock_irqrestore(&usbtv->buflock, flags);
}
static int usbtv_start(struct usbtv *usbtv)
{
int i;
int ret;
ret = usb_set_interface(usbtv->udev, 0, 0);
if (ret < 0)
return ret;
ret = usbtv_setup_capture(usbtv);
if (ret < 0)
return ret;
ret = usb_set_interface(usbtv->udev, 0, 1);
if (ret < 0)
return ret;
for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) {
struct urb *ip;
ip = usbtv_setup_iso_transfer(usbtv);
if (ip == NULL) {
ret = -ENOMEM;
goto start_fail;
}
usbtv->isoc_urbs[i] = ip;
ret = usb_submit_urb(ip, GFP_KERNEL);
if (ret < 0)
goto start_fail;
}
return 0;
start_fail:
usbtv_stop(usbtv);
return ret;
}
static int usbtv_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct usbtv *dev = video_drvdata(file);
strlcpy(cap->driver, "usbtv", sizeof(cap->driver));
strlcpy(cap->card, "usbtv", sizeof(cap->card));
usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
cap->device_caps = V4L2_CAP_VIDEO_CAPTURE;
cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
static int usbtv_enum_input(struct file *file, void *priv,
struct v4l2_input *i)
{
struct usbtv *dev = video_drvdata(file);
switch (i->index) {
case USBTV_COMPOSITE_INPUT:
strlcpy(i->name, "Composite", sizeof(i->name));
break;
case USBTV_SVIDEO_INPUT:
strlcpy(i->name, "S-Video", sizeof(i->name));
break;
default:
return -EINVAL;
}
i->type = V4L2_INPUT_TYPE_CAMERA;
i->std = dev->vdev.tvnorms;
return 0;
}
static int usbtv_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
if (f->index > 0)
return -EINVAL;
strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed",
sizeof(f->description));
f->pixelformat = V4L2_PIX_FMT_YUYV;
return 0;
}
static int usbtv_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct usbtv *usbtv = video_drvdata(file);
f->fmt.pix.width = usbtv->width;
f->fmt.pix.height = usbtv->height;
f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
f->fmt.pix.field = V4L2_FIELD_INTERLACED;
f->fmt.pix.bytesperline = usbtv->width * 2;
f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height);
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
return 0;
}
static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
struct usbtv *usbtv = video_drvdata(file);
*norm = usbtv->norm;
return 0;
}
static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
int ret = -EINVAL;
struct usbtv *usbtv = video_drvdata(file);
if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL))
ret = usbtv_select_norm(usbtv, norm);
return ret;
}
static int usbtv_g_input(struct file *file, void *priv, unsigned int *i)
{
struct usbtv *usbtv = video_drvdata(file);
*i = usbtv->input;
return 0;
}
static int usbtv_s_input(struct file *file, void *priv, unsigned int i)
{
struct usbtv *usbtv = video_drvdata(file);
return usbtv_select_input(usbtv, i);
}
static struct v4l2_ioctl_ops usbtv_ioctl_ops = {
.vidioc_querycap = usbtv_querycap,
.vidioc_enum_input = usbtv_enum_input,
.vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap,
.vidioc_g_std = usbtv_g_std,
.vidioc_s_std = usbtv_s_std,
.vidioc_g_input = usbtv_g_input,
.vidioc_s_input = usbtv_s_input,
.vidioc_reqbufs = vb2_ioctl_reqbufs,
.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
.vidioc_querybuf = vb2_ioctl_querybuf,
.vidioc_create_bufs = vb2_ioctl_create_bufs,
.vidioc_qbuf = vb2_ioctl_qbuf,
.vidioc_dqbuf = vb2_ioctl_dqbuf,
.vidioc_streamon = vb2_ioctl_streamon,
.vidioc_streamoff = vb2_ioctl_streamoff,
};
static struct v4l2_file_operations usbtv_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
.mmap = vb2_fop_mmap,
.open = v4l2_fh_open,
.release = vb2_fop_release,
.read = vb2_fop_read,
.poll = vb2_fop_poll,
};
static int usbtv_queue_setup(struct vb2_queue *vq,
const struct v4l2_format *v4l_fmt, unsigned int *nbuffers,
unsigned int *nplanes, unsigned int sizes[], void *alloc_ctxs[])
{
struct usbtv *usbtv = vb2_get_drv_priv(vq);
if (*nbuffers < 2)
*nbuffers = 2;
*nplanes = 1;
sizes[0] = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
return 0;
}
static void usbtv_buf_queue(struct vb2_buffer *vb)
{
struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue);
struct usbtv_buf *buf = container_of(vb, struct usbtv_buf, vb);
unsigned long flags;
if (usbtv->udev == NULL) {
vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
return;
}
spin_lock_irqsave(&usbtv->buflock, flags);
list_add_tail(&buf->list, &usbtv->bufs);
spin_unlock_irqrestore(&usbtv->buflock, flags);
}
static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct usbtv *usbtv = vb2_get_drv_priv(vq);
if (usbtv->udev == NULL)
return -ENODEV;
return usbtv_start(usbtv);
}
static int usbtv_stop_streaming(struct vb2_queue *vq)
{
struct usbtv *usbtv = vb2_get_drv_priv(vq);
if (usbtv->udev == NULL)
return -ENODEV;
usbtv_stop(usbtv);
return 0;
}
static struct vb2_ops usbtv_vb2_ops = {
.queue_setup = usbtv_queue_setup,
.buf_queue = usbtv_buf_queue,
.start_streaming = usbtv_start_streaming,
.stop_streaming = usbtv_stop_streaming,
};
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);
vb2_queue_release(&usbtv->vb2q);
kfree(usbtv);
}
int usbtv_video_init(struct usbtv *usbtv)
{
int ret;
(void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60);
spin_lock_init(&usbtv->buflock);
mutex_init(&usbtv->v4l2_lock);
mutex_init(&usbtv->vb2q_lock);
INIT_LIST_HEAD(&usbtv->bufs);
/* videobuf2 structure */
usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
usbtv->vb2q.drv_priv = usbtv;
usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
usbtv->vb2q.ops = &usbtv_vb2_ops;
usbtv->vb2q.mem_ops = &vb2_vmalloc_memops;
usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
usbtv->vb2q.lock = &usbtv->vb2q_lock;
ret = vb2_queue_init(&usbtv->vb2q);
if (ret < 0) {
dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n");
return ret;
}
/* v4l2 structure */
usbtv->v4l2_dev.release = usbtv_release;
ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev);
if (ret < 0) {
dev_warn(usbtv->dev, "Could not register v4l2 device\n");
goto v4l2_fail;
}
/* Video structure */
strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name));
usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev;
usbtv->vdev.release = video_device_release_empty;
usbtv->vdev.fops = &usbtv_fops;
usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops;
usbtv->vdev.tvnorms = USBTV_TV_STD;
usbtv->vdev.queue = &usbtv->vb2q;
usbtv->vdev.lock = &usbtv->v4l2_lock;
set_bit(V4L2_FL_USE_FH_PRIO, &usbtv->vdev.flags);
video_set_drvdata(&usbtv->vdev, usbtv);
ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0) {
dev_warn(usbtv->dev, "Could not register video device\n");
goto vdev_fail;
}
return 0;
vdev_fail:
v4l2_device_unregister(&usbtv->v4l2_dev);
v4l2_fail:
vb2_queue_release(&usbtv->vb2q);
return ret;
}
void usbtv_video_free(struct usbtv *usbtv)
{
mutex_lock(&usbtv->vb2q_lock);
mutex_lock(&usbtv->v4l2_lock);
usbtv_stop(usbtv);
video_unregister_device(&usbtv->vdev);
v4l2_device_disconnect(&usbtv->v4l2_dev);
mutex_unlock(&usbtv->v4l2_lock);
mutex_unlock(&usbtv->vb2q_lock);
v4l2_device_put(&usbtv->v4l2_dev);
}
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