mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 15:41:58 +00:00
078f894792
The UVC specification requires frame descriptors indexes to range from 1 to the number of frame descriptors. At least some Hercules Dualpix Infinite webcams erroneously use non-continuous index ranges. Make the driver support them. Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
1164 lines
33 KiB
C
1164 lines
33 KiB
C
/*
|
|
* uvc_video.c -- USB Video Class driver - Video handling
|
|
*
|
|
* Copyright (C) 2005-2009
|
|
* Laurent Pinchart (laurent.pinchart@skynet.be)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/videodev2.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/wait.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include <media/v4l2-common.h>
|
|
|
|
#include "uvcvideo.h"
|
|
|
|
/* ------------------------------------------------------------------------
|
|
* UVC Controls
|
|
*/
|
|
|
|
static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
|
|
__u8 intfnum, __u8 cs, void *data, __u16 size,
|
|
int timeout)
|
|
{
|
|
__u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE;
|
|
unsigned int pipe;
|
|
|
|
pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0)
|
|
: usb_sndctrlpipe(dev->udev, 0);
|
|
type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT;
|
|
|
|
return usb_control_msg(dev->udev, pipe, query, type, cs << 8,
|
|
unit << 8 | intfnum, data, size, timeout);
|
|
}
|
|
|
|
int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
|
|
__u8 intfnum, __u8 cs, void *data, __u16 size)
|
|
{
|
|
int ret;
|
|
|
|
ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size,
|
|
UVC_CTRL_CONTROL_TIMEOUT);
|
|
if (ret != size) {
|
|
uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u "
|
|
"(unit %u) : %d (exp. %u).\n", query, cs, unit, ret,
|
|
size);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void uvc_fixup_video_ctrl(struct uvc_video_device *video,
|
|
struct uvc_streaming_control *ctrl)
|
|
{
|
|
struct uvc_format *format;
|
|
struct uvc_frame *frame = NULL;
|
|
unsigned int i;
|
|
|
|
if (ctrl->bFormatIndex <= 0 ||
|
|
ctrl->bFormatIndex > video->streaming->nformats)
|
|
return;
|
|
|
|
format = &video->streaming->format[ctrl->bFormatIndex - 1];
|
|
|
|
for (i = 0; i < format->nframes; ++i) {
|
|
if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) {
|
|
frame = &format->frame[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (frame == NULL)
|
|
return;
|
|
|
|
if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) ||
|
|
(ctrl->dwMaxVideoFrameSize == 0 &&
|
|
video->dev->uvc_version < 0x0110))
|
|
ctrl->dwMaxVideoFrameSize =
|
|
frame->dwMaxVideoFrameBufferSize;
|
|
|
|
if (video->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH &&
|
|
video->streaming->intf->num_altsetting > 1) {
|
|
u32 interval;
|
|
u32 bandwidth;
|
|
|
|
interval = (ctrl->dwFrameInterval > 100000)
|
|
? ctrl->dwFrameInterval
|
|
: frame->dwFrameInterval[0];
|
|
|
|
/* Compute a bandwidth estimation by multiplying the frame
|
|
* size by the number of video frames per second, divide the
|
|
* result by the number of USB frames (or micro-frames for
|
|
* high-speed devices) per second and add the UVC header size
|
|
* (assumed to be 12 bytes long).
|
|
*/
|
|
bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp;
|
|
bandwidth *= 10000000 / interval + 1;
|
|
bandwidth /= 1000;
|
|
if (video->dev->udev->speed == USB_SPEED_HIGH)
|
|
bandwidth /= 8;
|
|
bandwidth += 12;
|
|
|
|
ctrl->dwMaxPayloadTransferSize = bandwidth;
|
|
}
|
|
}
|
|
|
|
static int uvc_get_video_ctrl(struct uvc_video_device *video,
|
|
struct uvc_streaming_control *ctrl, int probe, __u8 query)
|
|
{
|
|
__u8 *data;
|
|
__u16 size;
|
|
int ret;
|
|
|
|
size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
|
|
data = kmalloc(size, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum,
|
|
probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size,
|
|
UVC_CTRL_STREAMING_TIMEOUT);
|
|
|
|
if ((query == GET_MIN || query == GET_MAX) && ret == 2) {
|
|
/* Some cameras, mostly based on Bison Electronics chipsets,
|
|
* answer a GET_MIN or GET_MAX request with the wCompQuality
|
|
* field only.
|
|
*/
|
|
uvc_warn_once(video->dev, UVC_WARN_MINMAX, "UVC non "
|
|
"compliance - GET_MIN/MAX(PROBE) incorrectly "
|
|
"supported. Enabling workaround.\n");
|
|
memset(ctrl, 0, sizeof ctrl);
|
|
ctrl->wCompQuality = le16_to_cpup((__le16 *)data);
|
|
ret = 0;
|
|
goto out;
|
|
} else if (query == GET_DEF && probe == 1 && ret != size) {
|
|
/* Many cameras don't support the GET_DEF request on their
|
|
* video probe control. Warn once and return, the caller will
|
|
* fall back to GET_CUR.
|
|
*/
|
|
uvc_warn_once(video->dev, UVC_WARN_PROBE_DEF, "UVC non "
|
|
"compliance - GET_DEF(PROBE) not supported. "
|
|
"Enabling workaround.\n");
|
|
ret = -EIO;
|
|
goto out;
|
|
} else if (ret != size) {
|
|
uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : "
|
|
"%d (exp. %u).\n", query, probe ? "probe" : "commit",
|
|
ret, size);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]);
|
|
ctrl->bFormatIndex = data[2];
|
|
ctrl->bFrameIndex = data[3];
|
|
ctrl->dwFrameInterval = le32_to_cpup((__le32 *)&data[4]);
|
|
ctrl->wKeyFrameRate = le16_to_cpup((__le16 *)&data[8]);
|
|
ctrl->wPFrameRate = le16_to_cpup((__le16 *)&data[10]);
|
|
ctrl->wCompQuality = le16_to_cpup((__le16 *)&data[12]);
|
|
ctrl->wCompWindowSize = le16_to_cpup((__le16 *)&data[14]);
|
|
ctrl->wDelay = le16_to_cpup((__le16 *)&data[16]);
|
|
ctrl->dwMaxVideoFrameSize = get_unaligned_le32(&data[18]);
|
|
ctrl->dwMaxPayloadTransferSize = get_unaligned_le32(&data[22]);
|
|
|
|
if (size == 34) {
|
|
ctrl->dwClockFrequency = get_unaligned_le32(&data[26]);
|
|
ctrl->bmFramingInfo = data[30];
|
|
ctrl->bPreferedVersion = data[31];
|
|
ctrl->bMinVersion = data[32];
|
|
ctrl->bMaxVersion = data[33];
|
|
} else {
|
|
ctrl->dwClockFrequency = video->dev->clock_frequency;
|
|
ctrl->bmFramingInfo = 0;
|
|
ctrl->bPreferedVersion = 0;
|
|
ctrl->bMinVersion = 0;
|
|
ctrl->bMaxVersion = 0;
|
|
}
|
|
|
|
/* Some broken devices return null or wrong dwMaxVideoFrameSize and
|
|
* dwMaxPayloadTransferSize fields. Try to get the value from the
|
|
* format and frame descriptors.
|
|
*/
|
|
uvc_fixup_video_ctrl(video, ctrl);
|
|
ret = 0;
|
|
|
|
out:
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
static int uvc_set_video_ctrl(struct uvc_video_device *video,
|
|
struct uvc_streaming_control *ctrl, int probe)
|
|
{
|
|
__u8 *data;
|
|
__u16 size;
|
|
int ret;
|
|
|
|
size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
|
|
data = kzalloc(size, GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
*(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint);
|
|
data[2] = ctrl->bFormatIndex;
|
|
data[3] = ctrl->bFrameIndex;
|
|
*(__le32 *)&data[4] = cpu_to_le32(ctrl->dwFrameInterval);
|
|
*(__le16 *)&data[8] = cpu_to_le16(ctrl->wKeyFrameRate);
|
|
*(__le16 *)&data[10] = cpu_to_le16(ctrl->wPFrameRate);
|
|
*(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality);
|
|
*(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize);
|
|
*(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay);
|
|
put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]);
|
|
put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]);
|
|
|
|
if (size == 34) {
|
|
put_unaligned_le32(ctrl->dwClockFrequency, &data[26]);
|
|
data[30] = ctrl->bmFramingInfo;
|
|
data[31] = ctrl->bPreferedVersion;
|
|
data[32] = ctrl->bMinVersion;
|
|
data[33] = ctrl->bMaxVersion;
|
|
}
|
|
|
|
ret = __uvc_query_ctrl(video->dev, SET_CUR, 0,
|
|
video->streaming->intfnum,
|
|
probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size,
|
|
UVC_CTRL_STREAMING_TIMEOUT);
|
|
if (ret != size) {
|
|
uvc_printk(KERN_ERR, "Failed to set UVC %s control : "
|
|
"%d (exp. %u).\n", probe ? "probe" : "commit",
|
|
ret, size);
|
|
ret = -EIO;
|
|
}
|
|
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
int uvc_probe_video(struct uvc_video_device *video,
|
|
struct uvc_streaming_control *probe)
|
|
{
|
|
struct uvc_streaming_control probe_min, probe_max;
|
|
__u16 bandwidth;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
mutex_lock(&video->streaming->mutex);
|
|
|
|
/* Perform probing. The device should adjust the requested values
|
|
* according to its capabilities. However, some devices, namely the
|
|
* first generation UVC Logitech webcams, don't implement the Video
|
|
* Probe control properly, and just return the needed bandwidth. For
|
|
* that reason, if the needed bandwidth exceeds the maximum available
|
|
* bandwidth, try to lower the quality.
|
|
*/
|
|
if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0)
|
|
goto done;
|
|
|
|
/* Get the minimum and maximum values for compression settings. */
|
|
if (!(video->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) {
|
|
ret = uvc_get_video_ctrl(video, &probe_min, 1, GET_MIN);
|
|
if (ret < 0)
|
|
goto done;
|
|
ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX);
|
|
if (ret < 0)
|
|
goto done;
|
|
|
|
probe->wCompQuality = probe_max.wCompQuality;
|
|
}
|
|
|
|
for (i = 0; i < 2; ++i) {
|
|
if ((ret = uvc_set_video_ctrl(video, probe, 1)) < 0 ||
|
|
(ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
|
|
goto done;
|
|
|
|
if (video->streaming->intf->num_altsetting == 1)
|
|
break;
|
|
|
|
bandwidth = probe->dwMaxPayloadTransferSize;
|
|
if (bandwidth <= video->streaming->maxpsize)
|
|
break;
|
|
|
|
if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
|
|
ret = -ENOSPC;
|
|
goto done;
|
|
}
|
|
|
|
/* TODO: negotiate compression parameters */
|
|
probe->wKeyFrameRate = probe_min.wKeyFrameRate;
|
|
probe->wPFrameRate = probe_min.wPFrameRate;
|
|
probe->wCompQuality = probe_max.wCompQuality;
|
|
probe->wCompWindowSize = probe_min.wCompWindowSize;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&video->streaming->mutex);
|
|
return ret;
|
|
}
|
|
|
|
int uvc_commit_video(struct uvc_video_device *video,
|
|
struct uvc_streaming_control *probe)
|
|
{
|
|
return uvc_set_video_ctrl(video, probe, 0);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------
|
|
* Video codecs
|
|
*/
|
|
|
|
/* Values for bmHeaderInfo (Video and Still Image Payload Headers, 2.4.3.3) */
|
|
#define UVC_STREAM_EOH (1 << 7)
|
|
#define UVC_STREAM_ERR (1 << 6)
|
|
#define UVC_STREAM_STI (1 << 5)
|
|
#define UVC_STREAM_RES (1 << 4)
|
|
#define UVC_STREAM_SCR (1 << 3)
|
|
#define UVC_STREAM_PTS (1 << 2)
|
|
#define UVC_STREAM_EOF (1 << 1)
|
|
#define UVC_STREAM_FID (1 << 0)
|
|
|
|
/* Video payload decoding is handled by uvc_video_decode_start(),
|
|
* uvc_video_decode_data() and uvc_video_decode_end().
|
|
*
|
|
* uvc_video_decode_start is called with URB data at the start of a bulk or
|
|
* isochronous payload. It processes header data and returns the header size
|
|
* in bytes if successful. If an error occurs, it returns a negative error
|
|
* code. The following error codes have special meanings.
|
|
*
|
|
* - EAGAIN informs the caller that the current video buffer should be marked
|
|
* as done, and that the function should be called again with the same data
|
|
* and a new video buffer. This is used when end of frame conditions can be
|
|
* reliably detected at the beginning of the next frame only.
|
|
*
|
|
* If an error other than -EAGAIN is returned, the caller will drop the current
|
|
* payload. No call to uvc_video_decode_data and uvc_video_decode_end will be
|
|
* made until the next payload. -ENODATA can be used to drop the current
|
|
* payload if no other error code is appropriate.
|
|
*
|
|
* uvc_video_decode_data is called for every URB with URB data. It copies the
|
|
* data to the video buffer.
|
|
*
|
|
* uvc_video_decode_end is called with header data at the end of a bulk or
|
|
* isochronous payload. It performs any additional header data processing and
|
|
* returns 0 or a negative error code if an error occured. As header data have
|
|
* already been processed by uvc_video_decode_start, this functions isn't
|
|
* required to perform sanity checks a second time.
|
|
*
|
|
* For isochronous transfers where a payload is always transfered in a single
|
|
* URB, the three functions will be called in a row.
|
|
*
|
|
* To let the decoder process header data and update its internal state even
|
|
* when no video buffer is available, uvc_video_decode_start must be prepared
|
|
* to be called with a NULL buf parameter. uvc_video_decode_data and
|
|
* uvc_video_decode_end will never be called with a NULL buffer.
|
|
*/
|
|
static int uvc_video_decode_start(struct uvc_video_device *video,
|
|
struct uvc_buffer *buf, const __u8 *data, int len)
|
|
{
|
|
__u8 fid;
|
|
|
|
/* Sanity checks:
|
|
* - packet must be at least 2 bytes long
|
|
* - bHeaderLength value must be at least 2 bytes (see above)
|
|
* - bHeaderLength value can't be larger than the packet size.
|
|
*/
|
|
if (len < 2 || data[0] < 2 || data[0] > len)
|
|
return -EINVAL;
|
|
|
|
/* Skip payloads marked with the error bit ("error frames"). */
|
|
if (data[1] & UVC_STREAM_ERR) {
|
|
uvc_trace(UVC_TRACE_FRAME, "Dropping payload (error bit "
|
|
"set).\n");
|
|
return -ENODATA;
|
|
}
|
|
|
|
fid = data[1] & UVC_STREAM_FID;
|
|
|
|
/* Store the payload FID bit and return immediately when the buffer is
|
|
* NULL.
|
|
*/
|
|
if (buf == NULL) {
|
|
video->last_fid = fid;
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* Synchronize to the input stream by waiting for the FID bit to be
|
|
* toggled when the the buffer state is not UVC_BUF_STATE_ACTIVE.
|
|
* video->last_fid is initialized to -1, so the first isochronous
|
|
* frame will always be in sync.
|
|
*
|
|
* If the device doesn't toggle the FID bit, invert video->last_fid
|
|
* when the EOF bit is set to force synchronisation on the next packet.
|
|
*/
|
|
if (buf->state != UVC_BUF_STATE_ACTIVE) {
|
|
if (fid == video->last_fid) {
|
|
uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of "
|
|
"sync).\n");
|
|
if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) &&
|
|
(data[1] & UVC_STREAM_EOF))
|
|
video->last_fid ^= UVC_STREAM_FID;
|
|
return -ENODATA;
|
|
}
|
|
|
|
/* TODO: Handle PTS and SCR. */
|
|
buf->state = UVC_BUF_STATE_ACTIVE;
|
|
}
|
|
|
|
/* Mark the buffer as done if we're at the beginning of a new frame.
|
|
* End of frame detection is better implemented by checking the EOF
|
|
* bit (FID bit toggling is delayed by one frame compared to the EOF
|
|
* bit), but some devices don't set the bit at end of frame (and the
|
|
* last payload can be lost anyway). We thus must check if the FID has
|
|
* been toggled.
|
|
*
|
|
* video->last_fid is initialized to -1, so the first isochronous
|
|
* frame will never trigger an end of frame detection.
|
|
*
|
|
* Empty buffers (bytesused == 0) don't trigger end of frame detection
|
|
* as it doesn't make sense to return an empty buffer. This also
|
|
* avoids detecting end of frame conditions at FID toggling if the
|
|
* previous payload had the EOF bit set.
|
|
*/
|
|
if (fid != video->last_fid && buf->buf.bytesused != 0) {
|
|
uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit "
|
|
"toggled).\n");
|
|
buf->state = UVC_BUF_STATE_DONE;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
video->last_fid = fid;
|
|
|
|
return data[0];
|
|
}
|
|
|
|
static void uvc_video_decode_data(struct uvc_video_device *video,
|
|
struct uvc_buffer *buf, const __u8 *data, int len)
|
|
{
|
|
struct uvc_video_queue *queue = &video->queue;
|
|
unsigned int maxlen, nbytes;
|
|
void *mem;
|
|
|
|
if (len <= 0)
|
|
return;
|
|
|
|
/* Copy the video data to the buffer. */
|
|
maxlen = buf->buf.length - buf->buf.bytesused;
|
|
mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused;
|
|
nbytes = min((unsigned int)len, maxlen);
|
|
memcpy(mem, data, nbytes);
|
|
buf->buf.bytesused += nbytes;
|
|
|
|
/* Complete the current frame if the buffer size was exceeded. */
|
|
if (len > maxlen) {
|
|
uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n");
|
|
buf->state = UVC_BUF_STATE_DONE;
|
|
}
|
|
}
|
|
|
|
static void uvc_video_decode_end(struct uvc_video_device *video,
|
|
struct uvc_buffer *buf, const __u8 *data, int len)
|
|
{
|
|
/* Mark the buffer as done if the EOF marker is set. */
|
|
if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) {
|
|
uvc_trace(UVC_TRACE_FRAME, "Frame complete (EOF found).\n");
|
|
if (data[0] == len)
|
|
uvc_trace(UVC_TRACE_FRAME, "EOF in empty payload.\n");
|
|
buf->state = UVC_BUF_STATE_DONE;
|
|
if (video->dev->quirks & UVC_QUIRK_STREAM_NO_FID)
|
|
video->last_fid ^= UVC_STREAM_FID;
|
|
}
|
|
}
|
|
|
|
/* Video payload encoding is handled by uvc_video_encode_header() and
|
|
* uvc_video_encode_data(). Only bulk transfers are currently supported.
|
|
*
|
|
* uvc_video_encode_header is called at the start of a payload. It adds header
|
|
* data to the transfer buffer and returns the header size. As the only known
|
|
* UVC output device transfers a whole frame in a single payload, the EOF bit
|
|
* is always set in the header.
|
|
*
|
|
* uvc_video_encode_data is called for every URB and copies the data from the
|
|
* video buffer to the transfer buffer.
|
|
*/
|
|
static int uvc_video_encode_header(struct uvc_video_device *video,
|
|
struct uvc_buffer *buf, __u8 *data, int len)
|
|
{
|
|
data[0] = 2; /* Header length */
|
|
data[1] = UVC_STREAM_EOH | UVC_STREAM_EOF
|
|
| (video->last_fid & UVC_STREAM_FID);
|
|
return 2;
|
|
}
|
|
|
|
static int uvc_video_encode_data(struct uvc_video_device *video,
|
|
struct uvc_buffer *buf, __u8 *data, int len)
|
|
{
|
|
struct uvc_video_queue *queue = &video->queue;
|
|
unsigned int nbytes;
|
|
void *mem;
|
|
|
|
/* Copy video data to the URB buffer. */
|
|
mem = queue->mem + buf->buf.m.offset + queue->buf_used;
|
|
nbytes = min((unsigned int)len, buf->buf.bytesused - queue->buf_used);
|
|
nbytes = min(video->bulk.max_payload_size - video->bulk.payload_size,
|
|
nbytes);
|
|
memcpy(data, mem, nbytes);
|
|
|
|
queue->buf_used += nbytes;
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------
|
|
* URB handling
|
|
*/
|
|
|
|
/*
|
|
* Completion handler for video URBs.
|
|
*/
|
|
static void uvc_video_decode_isoc(struct urb *urb,
|
|
struct uvc_video_device *video, struct uvc_buffer *buf)
|
|
{
|
|
u8 *mem;
|
|
int ret, i;
|
|
|
|
for (i = 0; i < urb->number_of_packets; ++i) {
|
|
if (urb->iso_frame_desc[i].status < 0) {
|
|
uvc_trace(UVC_TRACE_FRAME, "USB isochronous frame "
|
|
"lost (%d).\n", urb->iso_frame_desc[i].status);
|
|
continue;
|
|
}
|
|
|
|
/* Decode the payload header. */
|
|
mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
|
|
do {
|
|
ret = uvc_video_decode_start(video, buf, mem,
|
|
urb->iso_frame_desc[i].actual_length);
|
|
if (ret == -EAGAIN)
|
|
buf = uvc_queue_next_buffer(&video->queue, buf);
|
|
} while (ret == -EAGAIN);
|
|
|
|
if (ret < 0)
|
|
continue;
|
|
|
|
/* Decode the payload data. */
|
|
uvc_video_decode_data(video, buf, mem + ret,
|
|
urb->iso_frame_desc[i].actual_length - ret);
|
|
|
|
/* Process the header again. */
|
|
uvc_video_decode_end(video, buf, mem,
|
|
urb->iso_frame_desc[i].actual_length);
|
|
|
|
if (buf->state == UVC_BUF_STATE_DONE ||
|
|
buf->state == UVC_BUF_STATE_ERROR)
|
|
buf = uvc_queue_next_buffer(&video->queue, buf);
|
|
}
|
|
}
|
|
|
|
static void uvc_video_decode_bulk(struct urb *urb,
|
|
struct uvc_video_device *video, struct uvc_buffer *buf)
|
|
{
|
|
u8 *mem;
|
|
int len, ret;
|
|
|
|
if (urb->actual_length == 0)
|
|
return;
|
|
|
|
mem = urb->transfer_buffer;
|
|
len = urb->actual_length;
|
|
video->bulk.payload_size += len;
|
|
|
|
/* If the URB is the first of its payload, decode and save the
|
|
* header.
|
|
*/
|
|
if (video->bulk.header_size == 0 && !video->bulk.skip_payload) {
|
|
do {
|
|
ret = uvc_video_decode_start(video, buf, mem, len);
|
|
if (ret == -EAGAIN)
|
|
buf = uvc_queue_next_buffer(&video->queue, buf);
|
|
} while (ret == -EAGAIN);
|
|
|
|
/* If an error occured skip the rest of the payload. */
|
|
if (ret < 0 || buf == NULL) {
|
|
video->bulk.skip_payload = 1;
|
|
} else {
|
|
memcpy(video->bulk.header, mem, ret);
|
|
video->bulk.header_size = ret;
|
|
|
|
mem += ret;
|
|
len -= ret;
|
|
}
|
|
}
|
|
|
|
/* The buffer queue might have been cancelled while a bulk transfer
|
|
* was in progress, so we can reach here with buf equal to NULL. Make
|
|
* sure buf is never dereferenced if NULL.
|
|
*/
|
|
|
|
/* Process video data. */
|
|
if (!video->bulk.skip_payload && buf != NULL)
|
|
uvc_video_decode_data(video, buf, mem, len);
|
|
|
|
/* Detect the payload end by a URB smaller than the maximum size (or
|
|
* a payload size equal to the maximum) and process the header again.
|
|
*/
|
|
if (urb->actual_length < urb->transfer_buffer_length ||
|
|
video->bulk.payload_size >= video->bulk.max_payload_size) {
|
|
if (!video->bulk.skip_payload && buf != NULL) {
|
|
uvc_video_decode_end(video, buf, video->bulk.header,
|
|
video->bulk.payload_size);
|
|
if (buf->state == UVC_BUF_STATE_DONE ||
|
|
buf->state == UVC_BUF_STATE_ERROR)
|
|
buf = uvc_queue_next_buffer(&video->queue, buf);
|
|
}
|
|
|
|
video->bulk.header_size = 0;
|
|
video->bulk.skip_payload = 0;
|
|
video->bulk.payload_size = 0;
|
|
}
|
|
}
|
|
|
|
static void uvc_video_encode_bulk(struct urb *urb,
|
|
struct uvc_video_device *video, struct uvc_buffer *buf)
|
|
{
|
|
u8 *mem = urb->transfer_buffer;
|
|
int len = video->urb_size, ret;
|
|
|
|
if (buf == NULL) {
|
|
urb->transfer_buffer_length = 0;
|
|
return;
|
|
}
|
|
|
|
/* If the URB is the first of its payload, add the header. */
|
|
if (video->bulk.header_size == 0) {
|
|
ret = uvc_video_encode_header(video, buf, mem, len);
|
|
video->bulk.header_size = ret;
|
|
video->bulk.payload_size += ret;
|
|
mem += ret;
|
|
len -= ret;
|
|
}
|
|
|
|
/* Process video data. */
|
|
ret = uvc_video_encode_data(video, buf, mem, len);
|
|
|
|
video->bulk.payload_size += ret;
|
|
len -= ret;
|
|
|
|
if (buf->buf.bytesused == video->queue.buf_used ||
|
|
video->bulk.payload_size == video->bulk.max_payload_size) {
|
|
if (buf->buf.bytesused == video->queue.buf_used) {
|
|
video->queue.buf_used = 0;
|
|
buf->state = UVC_BUF_STATE_DONE;
|
|
uvc_queue_next_buffer(&video->queue, buf);
|
|
video->last_fid ^= UVC_STREAM_FID;
|
|
}
|
|
|
|
video->bulk.header_size = 0;
|
|
video->bulk.payload_size = 0;
|
|
}
|
|
|
|
urb->transfer_buffer_length = video->urb_size - len;
|
|
}
|
|
|
|
static void uvc_video_complete(struct urb *urb)
|
|
{
|
|
struct uvc_video_device *video = urb->context;
|
|
struct uvc_video_queue *queue = &video->queue;
|
|
struct uvc_buffer *buf = NULL;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
switch (urb->status) {
|
|
case 0:
|
|
break;
|
|
|
|
default:
|
|
uvc_printk(KERN_WARNING, "Non-zero status (%d) in video "
|
|
"completion handler.\n", urb->status);
|
|
|
|
case -ENOENT: /* usb_kill_urb() called. */
|
|
if (video->frozen)
|
|
return;
|
|
|
|
case -ECONNRESET: /* usb_unlink_urb() called. */
|
|
case -ESHUTDOWN: /* The endpoint is being disabled. */
|
|
uvc_queue_cancel(queue, urb->status == -ESHUTDOWN);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&queue->irqlock, flags);
|
|
if (!list_empty(&queue->irqqueue))
|
|
buf = list_first_entry(&queue->irqqueue, struct uvc_buffer,
|
|
queue);
|
|
spin_unlock_irqrestore(&queue->irqlock, flags);
|
|
|
|
video->decode(urb, video, buf);
|
|
|
|
if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
|
|
uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
|
|
ret);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free transfer buffers.
|
|
*/
|
|
static void uvc_free_urb_buffers(struct uvc_video_device *video)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
if (video->urb_buffer[i]) {
|
|
usb_buffer_free(video->dev->udev, video->urb_size,
|
|
video->urb_buffer[i], video->urb_dma[i]);
|
|
video->urb_buffer[i] = NULL;
|
|
}
|
|
}
|
|
|
|
video->urb_size = 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate transfer buffers. This function can be called with buffers
|
|
* already allocated when resuming from suspend, in which case it will
|
|
* return without touching the buffers.
|
|
*
|
|
* Limit the buffer size to UVC_MAX_PACKETS bulk/isochronous packets. If the
|
|
* system is too low on memory try successively smaller numbers of packets
|
|
* until allocation succeeds.
|
|
*
|
|
* Return the number of allocated packets on success or 0 when out of memory.
|
|
*/
|
|
static int uvc_alloc_urb_buffers(struct uvc_video_device *video,
|
|
unsigned int size, unsigned int psize, gfp_t gfp_flags)
|
|
{
|
|
unsigned int npackets;
|
|
unsigned int i;
|
|
|
|
/* Buffers are already allocated, bail out. */
|
|
if (video->urb_size)
|
|
return video->urb_size / psize;
|
|
|
|
/* Compute the number of packets. Bulk endpoints might transfer UVC
|
|
* payloads accross multiple URBs.
|
|
*/
|
|
npackets = DIV_ROUND_UP(size, psize);
|
|
if (npackets > UVC_MAX_PACKETS)
|
|
npackets = UVC_MAX_PACKETS;
|
|
|
|
/* Retry allocations until one succeed. */
|
|
for (; npackets > 1; npackets /= 2) {
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
video->urb_buffer[i] = usb_buffer_alloc(
|
|
video->dev->udev, psize * npackets,
|
|
gfp_flags | __GFP_NOWARN, &video->urb_dma[i]);
|
|
if (!video->urb_buffer[i]) {
|
|
uvc_free_urb_buffers(video);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == UVC_URBS) {
|
|
video->urb_size = psize * npackets;
|
|
return npackets;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Uninitialize isochronous/bulk URBs and free transfer buffers.
|
|
*/
|
|
static void uvc_uninit_video(struct uvc_video_device *video, int free_buffers)
|
|
{
|
|
struct urb *urb;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
if ((urb = video->urb[i]) == NULL)
|
|
continue;
|
|
|
|
usb_kill_urb(urb);
|
|
usb_free_urb(urb);
|
|
video->urb[i] = NULL;
|
|
}
|
|
|
|
if (free_buffers)
|
|
uvc_free_urb_buffers(video);
|
|
}
|
|
|
|
/*
|
|
* Initialize isochronous URBs and allocate transfer buffers. The packet size
|
|
* is given by the endpoint.
|
|
*/
|
|
static int uvc_init_video_isoc(struct uvc_video_device *video,
|
|
struct usb_host_endpoint *ep, gfp_t gfp_flags)
|
|
{
|
|
struct urb *urb;
|
|
unsigned int npackets, i, j;
|
|
u16 psize;
|
|
u32 size;
|
|
|
|
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
|
|
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
|
|
size = video->streaming->ctrl.dwMaxVideoFrameSize;
|
|
|
|
npackets = uvc_alloc_urb_buffers(video, size, psize, gfp_flags);
|
|
if (npackets == 0)
|
|
return -ENOMEM;
|
|
|
|
size = npackets * psize;
|
|
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
urb = usb_alloc_urb(npackets, gfp_flags);
|
|
if (urb == NULL) {
|
|
uvc_uninit_video(video, 1);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
urb->dev = video->dev->udev;
|
|
urb->context = video;
|
|
urb->pipe = usb_rcvisocpipe(video->dev->udev,
|
|
ep->desc.bEndpointAddress);
|
|
urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
|
|
urb->interval = ep->desc.bInterval;
|
|
urb->transfer_buffer = video->urb_buffer[i];
|
|
urb->transfer_dma = video->urb_dma[i];
|
|
urb->complete = uvc_video_complete;
|
|
urb->number_of_packets = npackets;
|
|
urb->transfer_buffer_length = size;
|
|
|
|
for (j = 0; j < npackets; ++j) {
|
|
urb->iso_frame_desc[j].offset = j * psize;
|
|
urb->iso_frame_desc[j].length = psize;
|
|
}
|
|
|
|
video->urb[i] = urb;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize bulk URBs and allocate transfer buffers. The packet size is
|
|
* given by the endpoint.
|
|
*/
|
|
static int uvc_init_video_bulk(struct uvc_video_device *video,
|
|
struct usb_host_endpoint *ep, gfp_t gfp_flags)
|
|
{
|
|
struct urb *urb;
|
|
unsigned int npackets, pipe, i;
|
|
u16 psize;
|
|
u32 size;
|
|
|
|
psize = le16_to_cpu(ep->desc.wMaxPacketSize) & 0x07ff;
|
|
size = video->streaming->ctrl.dwMaxPayloadTransferSize;
|
|
video->bulk.max_payload_size = size;
|
|
|
|
npackets = uvc_alloc_urb_buffers(video, size, psize, gfp_flags);
|
|
if (npackets == 0)
|
|
return -ENOMEM;
|
|
|
|
size = npackets * psize;
|
|
|
|
if (usb_endpoint_dir_in(&ep->desc))
|
|
pipe = usb_rcvbulkpipe(video->dev->udev,
|
|
ep->desc.bEndpointAddress);
|
|
else
|
|
pipe = usb_sndbulkpipe(video->dev->udev,
|
|
ep->desc.bEndpointAddress);
|
|
|
|
if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
|
|
size = 0;
|
|
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
urb = usb_alloc_urb(0, gfp_flags);
|
|
if (urb == NULL) {
|
|
uvc_uninit_video(video, 1);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
usb_fill_bulk_urb(urb, video->dev->udev, pipe,
|
|
video->urb_buffer[i], size, uvc_video_complete,
|
|
video);
|
|
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
|
|
urb->transfer_dma = video->urb_dma[i];
|
|
|
|
video->urb[i] = urb;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize isochronous/bulk URBs and allocate transfer buffers.
|
|
*/
|
|
static int uvc_init_video(struct uvc_video_device *video, gfp_t gfp_flags)
|
|
{
|
|
struct usb_interface *intf = video->streaming->intf;
|
|
struct usb_host_interface *alts;
|
|
struct usb_host_endpoint *ep = NULL;
|
|
int intfnum = video->streaming->intfnum;
|
|
unsigned int bandwidth, psize, i;
|
|
int ret;
|
|
|
|
video->last_fid = -1;
|
|
video->bulk.header_size = 0;
|
|
video->bulk.skip_payload = 0;
|
|
video->bulk.payload_size = 0;
|
|
|
|
if (intf->num_altsetting > 1) {
|
|
/* Isochronous endpoint, select the alternate setting. */
|
|
bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize;
|
|
|
|
if (bandwidth == 0) {
|
|
uvc_printk(KERN_WARNING, "device %s requested null "
|
|
"bandwidth, defaulting to lowest.\n",
|
|
video->vdev->name);
|
|
bandwidth = 1;
|
|
}
|
|
|
|
for (i = 0; i < intf->num_altsetting; ++i) {
|
|
alts = &intf->altsetting[i];
|
|
ep = uvc_find_endpoint(alts,
|
|
video->streaming->header.bEndpointAddress);
|
|
if (ep == NULL)
|
|
continue;
|
|
|
|
/* Check if the bandwidth is high enough. */
|
|
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
|
|
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
|
|
if (psize >= bandwidth)
|
|
break;
|
|
}
|
|
|
|
if (i >= intf->num_altsetting)
|
|
return -EIO;
|
|
|
|
if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0)
|
|
return ret;
|
|
|
|
ret = uvc_init_video_isoc(video, ep, gfp_flags);
|
|
} else {
|
|
/* Bulk endpoint, proceed to URB initialization. */
|
|
ep = uvc_find_endpoint(&intf->altsetting[0],
|
|
video->streaming->header.bEndpointAddress);
|
|
if (ep == NULL)
|
|
return -EIO;
|
|
|
|
ret = uvc_init_video_bulk(video, ep, gfp_flags);
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Submit the URBs. */
|
|
for (i = 0; i < UVC_URBS; ++i) {
|
|
if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) {
|
|
uvc_printk(KERN_ERR, "Failed to submit URB %u "
|
|
"(%d).\n", i, ret);
|
|
uvc_uninit_video(video, 1);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
* Suspend/resume
|
|
*/
|
|
|
|
/*
|
|
* Stop streaming without disabling the video queue.
|
|
*
|
|
* To let userspace applications resume without trouble, we must not touch the
|
|
* video buffers in any way. We mark the device as frozen to make sure the URB
|
|
* completion handler won't try to cancel the queue when we kill the URBs.
|
|
*/
|
|
int uvc_video_suspend(struct uvc_video_device *video)
|
|
{
|
|
if (!uvc_queue_streaming(&video->queue))
|
|
return 0;
|
|
|
|
video->frozen = 1;
|
|
uvc_uninit_video(video, 0);
|
|
usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reconfigure the video interface and restart streaming if it was enabled
|
|
* before suspend.
|
|
*
|
|
* If an error occurs, disable the video queue. This will wake all pending
|
|
* buffers, making sure userspace applications are notified of the problem
|
|
* instead of waiting forever.
|
|
*/
|
|
int uvc_video_resume(struct uvc_video_device *video)
|
|
{
|
|
int ret;
|
|
|
|
video->frozen = 0;
|
|
|
|
if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) {
|
|
uvc_queue_enable(&video->queue, 0);
|
|
return ret;
|
|
}
|
|
|
|
if (!uvc_queue_streaming(&video->queue))
|
|
return 0;
|
|
|
|
if ((ret = uvc_init_video(video, GFP_NOIO)) < 0)
|
|
uvc_queue_enable(&video->queue, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------
|
|
* Video device
|
|
*/
|
|
|
|
/*
|
|
* Initialize the UVC video device by switching to alternate setting 0 and
|
|
* retrieve the default format.
|
|
*
|
|
* Some cameras (namely the Fuji Finepix) set the format and frame
|
|
* indexes to zero. The UVC standard doesn't clearly make this a spec
|
|
* violation, so try to silently fix the values if possible.
|
|
*
|
|
* This function is called before registering the device with V4L.
|
|
*/
|
|
int uvc_video_init(struct uvc_video_device *video)
|
|
{
|
|
struct uvc_streaming_control *probe = &video->streaming->ctrl;
|
|
struct uvc_format *format = NULL;
|
|
struct uvc_frame *frame = NULL;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (video->streaming->nformats == 0) {
|
|
uvc_printk(KERN_INFO, "No supported video formats found.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Alternate setting 0 should be the default, yet the XBox Live Vision
|
|
* Cam (and possibly other devices) crash or otherwise misbehave if
|
|
* they don't receive a SET_INTERFACE request before any other video
|
|
* control request.
|
|
*/
|
|
usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
|
|
|
|
/* Set the streaming probe control with default streaming parameters
|
|
* retrieved from the device. Webcams that don't suport GET_DEF
|
|
* requests on the probe control will just keep their current streaming
|
|
* parameters.
|
|
*/
|
|
if (uvc_get_video_ctrl(video, probe, 1, GET_DEF) == 0)
|
|
uvc_set_video_ctrl(video, probe, 1);
|
|
|
|
/* Initialize the streaming parameters with the probe control current
|
|
* value. This makes sure SET_CUR requests on the streaming commit
|
|
* control will always use values retrieved from a successful GET_CUR
|
|
* request on the probe control, as required by the UVC specification.
|
|
*/
|
|
if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
|
|
return ret;
|
|
|
|
/* Check if the default format descriptor exists. Use the first
|
|
* available format otherwise.
|
|
*/
|
|
for (i = video->streaming->nformats; i > 0; --i) {
|
|
format = &video->streaming->format[i-1];
|
|
if (format->index == probe->bFormatIndex)
|
|
break;
|
|
}
|
|
|
|
if (format->nframes == 0) {
|
|
uvc_printk(KERN_INFO, "No frame descriptor found for the "
|
|
"default format.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Zero bFrameIndex might be correct. Stream-based formats (including
|
|
* MPEG-2 TS and DV) do not support frames but have a dummy frame
|
|
* descriptor with bFrameIndex set to zero. If the default frame
|
|
* descriptor is not found, use the first available frame.
|
|
*/
|
|
for (i = format->nframes; i > 0; --i) {
|
|
frame = &format->frame[i-1];
|
|
if (frame->bFrameIndex == probe->bFrameIndex)
|
|
break;
|
|
}
|
|
|
|
probe->bFormatIndex = format->index;
|
|
probe->bFrameIndex = frame->bFrameIndex;
|
|
|
|
video->streaming->cur_format = format;
|
|
video->streaming->cur_frame = frame;
|
|
atomic_set(&video->active, 0);
|
|
|
|
/* Select the video decoding function */
|
|
if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
|
|
if (video->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
|
|
video->decode = uvc_video_decode_isight;
|
|
else if (video->streaming->intf->num_altsetting > 1)
|
|
video->decode = uvc_video_decode_isoc;
|
|
else
|
|
video->decode = uvc_video_decode_bulk;
|
|
} else {
|
|
if (video->streaming->intf->num_altsetting == 1)
|
|
video->decode = uvc_video_encode_bulk;
|
|
else {
|
|
uvc_printk(KERN_INFO, "Isochronous endpoints are not "
|
|
"supported for video output devices.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Enable or disable the video stream.
|
|
*/
|
|
int uvc_video_enable(struct uvc_video_device *video, int enable)
|
|
{
|
|
int ret;
|
|
|
|
if (!enable) {
|
|
uvc_uninit_video(video, 1);
|
|
usb_set_interface(video->dev->udev,
|
|
video->streaming->intfnum, 0);
|
|
uvc_queue_enable(&video->queue, 0);
|
|
return 0;
|
|
}
|
|
|
|
if ((video->streaming->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) ||
|
|
uvc_no_drop_param)
|
|
video->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE;
|
|
else
|
|
video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
|
|
|
|
if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
|
|
return ret;
|
|
|
|
/* Commit the streaming parameters. */
|
|
if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0)
|
|
return ret;
|
|
|
|
return uvc_init_video(video, GFP_KERNEL);
|
|
}
|
|
|