/*
* uvc_video.c -- USB Video Class driver - Video handling
*
- * Copyright (C) 2005-2008
+ * Copyright (C) 2005-2009
* Laurent Pinchart (laurent.pinchart@skynet.be)
*
* This program is free software; you can redistribute it and/or modify
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
return 0;
}
-static void uvc_fixup_buffer_size(struct uvc_video_device *video,
+static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
struct uvc_streaming_control *ctrl)
{
struct uvc_format *format;
- struct uvc_frame *frame;
+ struct uvc_frame *frame = NULL;
+ unsigned int i;
if (ctrl->bFormatIndex <= 0 ||
- ctrl->bFormatIndex > video->streaming->nformats)
+ ctrl->bFormatIndex > stream->nformats)
return;
- format = &video->streaming->format[ctrl->bFormatIndex - 1];
+ format = &stream->format[ctrl->bFormatIndex - 1];
- if (ctrl->bFrameIndex <= 0 ||
- ctrl->bFrameIndex > format->nframes)
- return;
+ for (i = 0; i < format->nframes; ++i) {
+ if (format->frame[i].bFrameIndex == ctrl->bFrameIndex) {
+ frame = &format->frame[i];
+ break;
+ }
+ }
- frame = &format->frame[ctrl->bFrameIndex - 1];
+ if (frame == NULL)
+ return;
if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) ||
(ctrl->dwMaxVideoFrameSize == 0 &&
- video->dev->uvc_version < 0x0110))
+ stream->dev->uvc_version < 0x0110))
ctrl->dwMaxVideoFrameSize =
frame->dwMaxVideoFrameBufferSize;
+
+ if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) &&
+ stream->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH &&
+ stream->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 (stream->dev->udev->speed == USB_SPEED_HIGH)
+ bandwidth /= 8;
+ bandwidth += 12;
+
+ ctrl->dwMaxPayloadTransferSize = bandwidth;
+ }
}
-static int uvc_get_video_ctrl(struct uvc_video_device *video,
+static int uvc_get_video_ctrl(struct uvc_streaming *stream,
struct uvc_streaming_control *ctrl, int probe, __u8 query)
{
__u8 *data;
__u16 size;
int ret;
- size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
+ size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
+ if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) &&
+ query == UVC_GET_DEF)
+ return -EIO;
+
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);
+ ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum,
+ probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data,
+ size, uvc_timeout_param);
- if ((query == GET_MIN || query == GET_MAX) && ret == 2) {
+ if ((query == UVC_GET_MIN || query == UVC_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 "
+ uvc_warn_once(stream->dev, UVC_WARN_MINMAX, "UVC non "
"compliance - GET_MIN/MAX(PROBE) incorrectly "
"supported. Enabling workaround.\n");
- memset(ctrl, 0, sizeof ctrl);
+ memset(ctrl, 0, sizeof *ctrl);
ctrl->wCompQuality = le16_to_cpup((__le16 *)data);
ret = 0;
goto out;
- } else if (query == GET_DEF && probe == 1) {
+ } else if (query == UVC_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 "
+ uvc_warn_once(stream->dev, UVC_WARN_PROBE_DEF, "UVC non "
"compliance - GET_DEF(PROBE) not supported. "
"Enabling workaround.\n");
ret = -EIO;
ctrl->bMinVersion = data[32];
ctrl->bMaxVersion = data[33];
} else {
- ctrl->dwClockFrequency = video->dev->clock_frequency;
+ ctrl->dwClockFrequency = stream->dev->clock_frequency;
ctrl->bmFramingInfo = 0;
ctrl->bPreferedVersion = 0;
ctrl->bMinVersion = 0;
ctrl->bMaxVersion = 0;
}
- /* Some broken devices return a null or wrong dwMaxVideoFrameSize.
- * Try to get the value from the format and frame descriptor.
+ /* Some broken devices return null or wrong dwMaxVideoFrameSize and
+ * dwMaxPayloadTransferSize fields. Try to get the value from the
+ * format and frame descriptors.
*/
- uvc_fixup_buffer_size(video, ctrl);
+ uvc_fixup_video_ctrl(stream, ctrl);
ret = 0;
out:
return ret;
}
-static int uvc_set_video_ctrl(struct uvc_video_device *video,
+static int uvc_set_video_ctrl(struct uvc_streaming *stream,
struct uvc_streaming_control *ctrl, int probe)
{
__u8 *data;
__u16 size;
int ret;
- size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
+ size = stream->dev->uvc_version >= 0x0110 ? 34 : 26;
data = kzalloc(size, GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
*(__le16 *)&data[12] = cpu_to_le16(ctrl->wCompQuality);
*(__le16 *)&data[14] = cpu_to_le16(ctrl->wCompWindowSize);
*(__le16 *)&data[16] = cpu_to_le16(ctrl->wDelay);
- /* Note: Some of the fields below are not required for IN devices (see
- * UVC spec, 4.3.1.1), but we still copy them in case support for OUT
- * devices is added in the future. */
put_unaligned_le32(ctrl->dwMaxVideoFrameSize, &data[18]);
put_unaligned_le32(ctrl->dwMaxPayloadTransferSize, &data[22]);
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);
+ ret = __uvc_query_ctrl(stream->dev, UVC_SET_CUR, 0, stream->intfnum,
+ probe ? UVC_VS_PROBE_CONTROL : UVC_VS_COMMIT_CONTROL, data,
+ size, uvc_timeout_param);
if (ret != size) {
uvc_printk(KERN_ERR, "Failed to set UVC %s control : "
"%d (exp. %u).\n", probe ? "probe" : "commit",
return ret;
}
-int uvc_probe_video(struct uvc_video_device *video,
+int uvc_probe_video(struct uvc_streaming *stream,
struct uvc_streaming_control *probe)
{
struct uvc_streaming_control probe_min, probe_max;
unsigned int i;
int ret;
- mutex_lock(&video->streaming->mutex);
+ mutex_lock(&stream->mutex);
/* Perform probing. The device should adjust the requested values
* according to its capabilities. However, some devices, namely the
* 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)
+ ret = uvc_set_video_ctrl(stream, probe, 1);
+ if (ret < 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 (!(stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX)) {
+ ret = uvc_get_video_ctrl(stream, &probe_min, 1, UVC_GET_MIN);
if (ret < 0)
goto done;
- ret = uvc_get_video_ctrl(video, &probe_max, 1, GET_MAX);
+ ret = uvc_get_video_ctrl(stream, &probe_max, 1, UVC_GET_MAX);
if (ret < 0)
goto done;
}
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)
+ ret = uvc_set_video_ctrl(stream, probe, 1);
+ if (ret < 0)
+ goto done;
+ ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR);
+ if (ret < 0)
goto done;
- if (video->streaming->intf->num_altsetting == 1)
+ if (stream->intf->num_altsetting == 1)
break;
bandwidth = probe->dwMaxPayloadTransferSize;
- if (bandwidth <= video->streaming->maxpsize)
+ if (bandwidth <= stream->maxpsize)
break;
- if (video->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
+ if (stream->dev->quirks & UVC_QUIRK_PROBE_MINMAX) {
ret = -ENOSPC;
goto done;
}
}
done:
- mutex_unlock(&video->streaming->mutex);
+ mutex_unlock(&stream->mutex);
return ret;
}
-int uvc_commit_video(struct uvc_video_device *video,
+int uvc_commit_video(struct uvc_streaming *stream,
struct uvc_streaming_control *probe)
{
- return uvc_set_video_ctrl(video, probe, 0);
+ return uvc_set_video_ctrl(stream, probe, 0);
}
/* ------------------------------------------------------------------------
* 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,
+static int uvc_video_decode_start(struct uvc_streaming *stream,
struct uvc_buffer *buf, const __u8 *data, int len)
{
__u8 fid;
* NULL.
*/
if (buf == NULL) {
- video->last_fid = fid;
+ stream->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
+ * stream->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
+ * If the device doesn't toggle the FID bit, invert stream->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) {
+ struct timespec ts;
+
+ if (fid == stream->last_fid) {
uvc_trace(UVC_TRACE_FRAME, "Dropping payload (out of "
"sync).\n");
- if ((video->dev->quirks & UVC_QUIRK_STREAM_NO_FID) &&
+ if ((stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID) &&
(data[1] & UVC_STREAM_EOF))
- video->last_fid ^= UVC_STREAM_FID;
+ stream->last_fid ^= UVC_STREAM_FID;
return -ENODATA;
}
+ if (uvc_clock_param == CLOCK_MONOTONIC)
+ ktime_get_ts(&ts);
+ else
+ ktime_get_real_ts(&ts);
+
+ buf->buf.timestamp.tv_sec = ts.tv_sec;
+ buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+
/* TODO: Handle PTS and SCR. */
buf->state = UVC_BUF_STATE_ACTIVE;
}
* 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
+ * stream->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 and of frame conditions at FID toggling if the
+ * 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) {
+ if (fid != stream->last_fid && buf->buf.bytesused != 0) {
uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit "
"toggled).\n");
- buf->state = UVC_BUF_STATE_DONE;
+ buf->state = UVC_BUF_STATE_READY;
return -EAGAIN;
}
- video->last_fid = fid;
+ stream->last_fid = fid;
return data[0];
}
-static void uvc_video_decode_data(struct uvc_video_device *video,
+static void uvc_video_decode_data(struct uvc_streaming *stream,
struct uvc_buffer *buf, const __u8 *data, int len)
{
- struct uvc_video_queue *queue = &video->queue;
+ struct uvc_video_queue *queue = &stream->queue;
unsigned int maxlen, nbytes;
void *mem;
/* 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;
+ buf->state = UVC_BUF_STATE_READY;
}
}
-static void uvc_video_decode_end(struct uvc_video_device *video,
+static void uvc_video_decode_end(struct uvc_streaming *stream,
struct uvc_buffer *buf, const __u8 *data, int len)
{
/* Mark the buffer as done if the EOF marker is set. */
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;
+ buf->state = UVC_BUF_STATE_READY;
+ if (stream->dev->quirks & UVC_QUIRK_STREAM_NO_FID)
+ stream->last_fid ^= UVC_STREAM_FID;
}
}
-static int uvc_video_encode_header(struct uvc_video_device *video,
+/* 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_streaming *stream,
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);
+ | (stream->last_fid & UVC_STREAM_FID);
return 2;
}
-static int uvc_video_encode_data(struct uvc_video_device *video,
+static int uvc_video_encode_data(struct uvc_streaming *stream,
struct uvc_buffer *buf, __u8 *data, int len)
{
- struct uvc_video_queue *queue = &video->queue;
+ struct uvc_video_queue *queue = &stream->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 = min(stream->bulk.max_payload_size - stream->bulk.payload_size,
nbytes);
memcpy(data, mem, nbytes);
/*
* Completion handler for video URBs.
*/
-static void uvc_video_decode_isoc(struct urb *urb,
- struct uvc_video_device *video, struct uvc_buffer *buf)
+static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
+ struct uvc_buffer *buf)
{
u8 *mem;
int ret, i;
/* Decode the payload header. */
mem = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
do {
- ret = uvc_video_decode_start(video, buf, mem,
+ ret = uvc_video_decode_start(stream, buf, mem,
urb->iso_frame_desc[i].actual_length);
if (ret == -EAGAIN)
- buf = uvc_queue_next_buffer(&video->queue, buf);
+ buf = uvc_queue_next_buffer(&stream->queue,
+ buf);
} while (ret == -EAGAIN);
if (ret < 0)
continue;
/* Decode the payload data. */
- uvc_video_decode_data(video, buf, mem + ret,
+ uvc_video_decode_data(stream, buf, mem + ret,
urb->iso_frame_desc[i].actual_length - ret);
/* Process the header again. */
- uvc_video_decode_end(video, buf, mem,
+ uvc_video_decode_end(stream, 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);
+ if (buf->state == UVC_BUF_STATE_READY)
+ buf = uvc_queue_next_buffer(&stream->queue, buf);
}
}
-static void uvc_video_decode_bulk(struct urb *urb,
- struct uvc_video_device *video, struct uvc_buffer *buf)
+static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
+ 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;
+ stream->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) {
+ if (stream->bulk.header_size == 0 && !stream->bulk.skip_payload) {
do {
- ret = uvc_video_decode_start(video, buf, mem, len);
+ ret = uvc_video_decode_start(stream, buf, mem, len);
if (ret == -EAGAIN)
- buf = uvc_queue_next_buffer(&video->queue, buf);
+ buf = uvc_queue_next_buffer(&stream->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;
+ stream->bulk.skip_payload = 1;
} else {
- memcpy(video->bulk.header, mem, ret);
- video->bulk.header_size = ret;
+ memcpy(stream->bulk.header, mem, ret);
+ stream->bulk.header_size = ret;
mem += ret;
len -= ret;
*/
/* Process video data. */
- if (!video->bulk.skip_payload && buf != NULL)
- uvc_video_decode_data(video, buf, mem, len);
+ if (!stream->bulk.skip_payload && buf != NULL)
+ uvc_video_decode_data(stream, 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);
+ stream->bulk.payload_size >= stream->bulk.max_payload_size) {
+ if (!stream->bulk.skip_payload && buf != NULL) {
+ uvc_video_decode_end(stream, buf, stream->bulk.header,
+ stream->bulk.payload_size);
+ if (buf->state == UVC_BUF_STATE_READY)
+ buf = uvc_queue_next_buffer(&stream->queue,
+ buf);
}
- video->bulk.header_size = 0;
- video->bulk.skip_payload = 0;
- video->bulk.payload_size = 0;
+ stream->bulk.header_size = 0;
+ stream->bulk.skip_payload = 0;
+ stream->bulk.payload_size = 0;
}
}
-static void uvc_video_encode_bulk(struct urb *urb,
- struct uvc_video_device *video, struct uvc_buffer *buf)
+static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream,
+ struct uvc_buffer *buf)
{
u8 *mem = urb->transfer_buffer;
- int len = video->urb_size, ret;
+ int len = stream->urb_size, ret;
if (buf == NULL) {
urb->transfer_buffer_length = 0;
}
/* 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;
+ if (stream->bulk.header_size == 0) {
+ ret = uvc_video_encode_header(stream, buf, mem, len);
+ stream->bulk.header_size = ret;
+ stream->bulk.payload_size += ret;
mem += ret;
len -= ret;
}
/* Process video data. */
- ret = uvc_video_encode_data(video, buf, mem, len);
+ ret = uvc_video_encode_data(stream, buf, mem, len);
- video->bulk.payload_size += ret;
+ stream->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;
+ if (buf->buf.bytesused == stream->queue.buf_used ||
+ stream->bulk.payload_size == stream->bulk.max_payload_size) {
+ if (buf->buf.bytesused == stream->queue.buf_used) {
+ stream->queue.buf_used = 0;
+ buf->state = UVC_BUF_STATE_READY;
+ uvc_queue_next_buffer(&stream->queue, buf);
+ stream->last_fid ^= UVC_STREAM_FID;
}
- video->bulk.header_size = 0;
- video->bulk.payload_size = 0;
+ stream->bulk.header_size = 0;
+ stream->bulk.payload_size = 0;
}
- urb->transfer_buffer_length = video->urb_size - len;
+ urb->transfer_buffer_length = stream->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_streaming *stream = urb->context;
+ struct uvc_video_queue *queue = &stream->queue;
struct uvc_buffer *buf = NULL;
unsigned long flags;
int ret;
"completion handler.\n", urb->status);
case -ENOENT: /* usb_kill_urb() called. */
- if (video->frozen)
+ if (stream->frozen)
return;
case -ECONNRESET: /* usb_unlink_urb() called. */
queue);
spin_unlock_irqrestore(&queue->irqlock, flags);
- video->decode(urb, video, buf);
+ stream->decode(urb, stream, buf);
if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
/*
* Free transfer buffers.
*/
-static void uvc_free_urb_buffers(struct uvc_video_device *video)
+static void uvc_free_urb_buffers(struct uvc_streaming *stream)
{
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;
+ if (stream->urb_buffer[i]) {
+ usb_buffer_free(stream->dev->udev, stream->urb_size,
+ stream->urb_buffer[i], stream->urb_dma[i]);
+ stream->urb_buffer[i] = NULL;
}
}
- video->urb_size = 0;
+ stream->urb_size = 0;
}
/*
* already allocated when resuming from suspend, in which case it will
* return without touching the buffers.
*
- * Return 0 on success or -ENOMEM when out of memory.
+ * 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)
+static int uvc_alloc_urb_buffers(struct uvc_streaming *stream,
+ 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 0;
+ if (stream->urb_size)
+ return stream->urb_size / psize;
- for (i = 0; i < UVC_URBS; ++i) {
- video->urb_buffer[i] = usb_buffer_alloc(video->dev->udev,
- size, GFP_KERNEL, &video->urb_dma[i]);
- if (video->urb_buffer[i] == NULL) {
- uvc_free_urb_buffers(video);
- return -ENOMEM;
+ /* 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) {
+ stream->urb_size = psize * npackets;
+ stream->urb_buffer[i] = usb_buffer_alloc(
+ stream->dev->udev, stream->urb_size,
+ gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]);
+ if (!stream->urb_buffer[i]) {
+ uvc_free_urb_buffers(stream);
+ break;
+ }
+ }
+
+ if (i == UVC_URBS) {
+ uvc_trace(UVC_TRACE_VIDEO, "Allocated %u URB buffers "
+ "of %ux%u bytes each.\n", UVC_URBS, npackets,
+ psize);
+ return npackets;
}
}
- video->urb_size = size;
+ uvc_trace(UVC_TRACE_VIDEO, "Failed to allocate URB buffers (%u bytes "
+ "per packet).\n", psize);
return 0;
}
/*
* Uninitialize isochronous/bulk URBs and free transfer buffers.
*/
-static void uvc_uninit_video(struct uvc_video_device *video, int free_buffers)
+static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers)
{
struct urb *urb;
unsigned int i;
for (i = 0; i < UVC_URBS; ++i) {
- if ((urb = video->urb[i]) == NULL)
+ urb = stream->urb[i];
+ if (urb == NULL)
continue;
usb_kill_urb(urb);
usb_free_urb(urb);
- video->urb[i] = NULL;
+ stream->urb[i] = NULL;
}
if (free_buffers)
- uvc_free_urb_buffers(video);
+ uvc_free_urb_buffers(stream);
}
/*
* 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,
+static int uvc_init_video_isoc(struct uvc_streaming *stream,
struct usb_host_endpoint *ep, gfp_t gfp_flags)
{
struct urb *urb;
unsigned int npackets, i, j;
- __u16 psize;
- __u32 size;
+ u16 psize;
+ u32 size;
- /* Compute the number of isochronous packets to allocate by dividing
- * the maximum video frame size by the packet size. Limit the result
- * to UVC_MAX_ISO_PACKETS.
- */
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+ size = stream->ctrl.dwMaxVideoFrameSize;
- size = video->streaming->ctrl.dwMaxVideoFrameSize;
- if (size > UVC_MAX_FRAME_SIZE)
- return -EINVAL;
-
- npackets = DIV_ROUND_UP(size, psize);
- if (npackets > UVC_MAX_ISO_PACKETS)
- npackets = UVC_MAX_ISO_PACKETS;
+ npackets = uvc_alloc_urb_buffers(stream, size, psize, gfp_flags);
+ if (npackets == 0)
+ return -ENOMEM;
size = npackets * psize;
- if (uvc_alloc_urb_buffers(video, size) < 0)
- return -ENOMEM;
-
for (i = 0; i < UVC_URBS; ++i) {
urb = usb_alloc_urb(npackets, gfp_flags);
if (urb == NULL) {
- uvc_uninit_video(video, 1);
+ uvc_uninit_video(stream, 1);
return -ENOMEM;
}
- urb->dev = video->dev->udev;
- urb->context = video;
- urb->pipe = usb_rcvisocpipe(video->dev->udev,
+ urb->dev = stream->dev->udev;
+ urb->context = stream;
+ urb->pipe = usb_rcvisocpipe(stream->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->transfer_buffer = stream->urb_buffer[i];
+ urb->transfer_dma = stream->urb_dma[i];
urb->complete = uvc_video_complete;
urb->number_of_packets = npackets;
urb->transfer_buffer_length = size;
urb->iso_frame_desc[j].length = psize;
}
- video->urb[i] = urb;
+ stream->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,
+static int uvc_init_video_bulk(struct uvc_streaming *stream,
struct usb_host_endpoint *ep, gfp_t gfp_flags)
{
struct urb *urb;
- unsigned int pipe, i;
- __u16 psize;
- __u32 size;
-
- /* Compute the bulk URB size. Some devices set the maximum payload
- * size to a value too high for memory-constrained devices. We must
- * then transfer the payload accross multiple URBs. To be consistant
- * with isochronous mode, allocate maximum UVC_MAX_ISO_PACKETS per bulk
- * 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;
- if (size > psize * UVC_MAX_ISO_PACKETS)
- size = psize * UVC_MAX_ISO_PACKETS;
+ size = stream->ctrl.dwMaxPayloadTransferSize;
+ stream->bulk.max_payload_size = size;
- if (uvc_alloc_urb_buffers(video, size) < 0)
+ npackets = uvc_alloc_urb_buffers(stream, 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,
+ pipe = usb_rcvbulkpipe(stream->dev->udev,
ep->desc.bEndpointAddress);
else
- pipe = usb_sndbulkpipe(video->dev->udev,
+ pipe = usb_sndbulkpipe(stream->dev->udev,
ep->desc.bEndpointAddress);
- if (video->streaming->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ if (stream->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);
+ uvc_uninit_video(stream, 1);
return -ENOMEM;
}
- usb_fill_bulk_urb(urb, video->dev->udev, pipe,
- video->urb_buffer[i], size, uvc_video_complete,
- video);
+ usb_fill_bulk_urb(urb, stream->dev->udev, pipe,
+ stream->urb_buffer[i], size, uvc_video_complete,
+ stream);
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
- urb->transfer_dma = video->urb_dma[i];
+ urb->transfer_dma = stream->urb_dma[i];
- video->urb[i] = urb;
+ stream->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)
+static int uvc_init_video(struct uvc_streaming *stream, 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;
+ struct usb_interface *intf = stream->intf;
+ struct usb_host_endpoint *ep;
+ unsigned int i;
int ret;
- video->last_fid = -1;
- video->bulk.header_size = 0;
- video->bulk.skip_payload = 0;
- video->bulk.payload_size = 0;
+ stream->last_fid = -1;
+ stream->bulk.header_size = 0;
+ stream->bulk.skip_payload = 0;
+ stream->bulk.payload_size = 0;
if (intf->num_altsetting > 1) {
+ struct usb_host_endpoint *best_ep = NULL;
+ unsigned int best_psize = 3 * 1024;
+ unsigned int bandwidth;
+ unsigned int uninitialized_var(altsetting);
+ int intfnum = stream->intfnum;
+
/* Isochronous endpoint, select the alternate setting. */
- bandwidth = video->streaming->ctrl.dwMaxPayloadTransferSize;
+ bandwidth = stream->ctrl.dwMaxPayloadTransferSize;
if (bandwidth == 0) {
- uvc_printk(KERN_WARNING, "device %s requested null "
- "bandwidth, defaulting to lowest.\n",
- video->vdev->name);
+ uvc_trace(UVC_TRACE_VIDEO, "Device requested null "
+ "bandwidth, defaulting to lowest.\n");
bandwidth = 1;
+ } else {
+ uvc_trace(UVC_TRACE_VIDEO, "Device requested %u "
+ "B/frame bandwidth.\n", bandwidth);
}
for (i = 0; i < intf->num_altsetting; ++i) {
+ struct usb_host_interface *alts;
+ unsigned int psize;
+
alts = &intf->altsetting[i];
ep = uvc_find_endpoint(alts,
- video->streaming->header.bEndpointAddress);
+ stream->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 (psize >= bandwidth && psize <= best_psize) {
+ altsetting = i;
+ best_psize = psize;
+ best_ep = ep;
+ }
}
- if (i >= intf->num_altsetting)
+ if (best_ep == NULL) {
+ uvc_trace(UVC_TRACE_VIDEO, "No fast enough alt setting "
+ "for requested bandwidth.\n");
return -EIO;
+ }
+
+ uvc_trace(UVC_TRACE_VIDEO, "Selecting alternate setting %u "
+ "(%u B/frame bandwidth).\n", altsetting, best_psize);
- if ((ret = usb_set_interface(video->dev->udev, intfnum, i)) < 0)
+ ret = usb_set_interface(stream->dev->udev, intfnum, altsetting);
+ if (ret < 0)
return ret;
- ret = uvc_init_video_isoc(video, ep, gfp_flags);
+ ret = uvc_init_video_isoc(stream, best_ep, gfp_flags);
} else {
/* Bulk endpoint, proceed to URB initialization. */
ep = uvc_find_endpoint(&intf->altsetting[0],
- video->streaming->header.bEndpointAddress);
+ stream->header.bEndpointAddress);
if (ep == NULL)
return -EIO;
- ret = uvc_init_video_bulk(video, ep, gfp_flags);
+ ret = uvc_init_video_bulk(stream, ep, gfp_flags);
}
if (ret < 0)
/* Submit the URBs. */
for (i = 0; i < UVC_URBS; ++i) {
- if ((ret = usb_submit_urb(video->urb[i], gfp_flags)) < 0) {
+ ret = usb_submit_urb(stream->urb[i], gfp_flags);
+ if (ret < 0) {
uvc_printk(KERN_ERR, "Failed to submit URB %u "
"(%d).\n", i, ret);
- uvc_uninit_video(video, 1);
+ uvc_uninit_video(stream, 1);
return ret;
}
}
* 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)
+int uvc_video_suspend(struct uvc_streaming *stream)
{
- if (!uvc_queue_streaming(&video->queue))
+ if (!uvc_queue_streaming(&stream->queue))
return 0;
- video->frozen = 1;
- uvc_uninit_video(video, 0);
- usb_set_interface(video->dev->udev, video->streaming->intfnum, 0);
+ stream->frozen = 1;
+ uvc_uninit_video(stream, 0);
+ usb_set_interface(stream->dev->udev, stream->intfnum, 0);
return 0;
}
/*
- * Reconfigure the video interface and restart streaming if it was enable
+ * 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 uvc_video_resume(struct uvc_streaming *stream)
{
int ret;
- video->frozen = 0;
+ stream->frozen = 0;
- if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0) {
- uvc_queue_enable(&video->queue, 0);
+ ret = uvc_commit_video(stream, &stream->ctrl);
+ if (ret < 0) {
+ uvc_queue_enable(&stream->queue, 0);
return ret;
}
- if (!uvc_queue_streaming(&video->queue))
+ if (!uvc_queue_streaming(&stream->queue))
return 0;
- if ((ret = uvc_init_video(video, GFP_NOIO)) < 0)
- uvc_queue_enable(&video->queue, 0);
+ ret = uvc_init_video(stream, GFP_NOIO);
+ if (ret < 0)
+ uvc_queue_enable(&stream->queue, 0);
return ret;
}
*/
/*
- * Initialize the UVC video device by retrieving the default format and
- * committing it.
+ * 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
*
* This function is called before registering the device with V4L.
*/
-int uvc_video_init(struct uvc_video_device *video)
+int uvc_video_init(struct uvc_streaming *stream)
{
- struct uvc_streaming_control *probe = &video->streaming->ctrl;
+ struct uvc_streaming_control *probe = &stream->ctrl;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
unsigned int i;
int ret;
- if (video->streaming->nformats == 0) {
+ if (stream->nformats == 0) {
uvc_printk(KERN_INFO, "No supported video formats found.\n");
return -EINVAL;
}
+ atomic_set(&stream->active, 0);
+
+ /* Initialize the video buffers queue. */
+ uvc_queue_init(&stream->queue, stream->type);
+
/* 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);
+ usb_set_interface(stream->dev->udev, stream->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(stream, probe, 1, UVC_GET_DEF) == 0)
+ uvc_set_video_ctrl(stream, probe, 1);
- /* Some webcams don't suport GET_DEF request on the probe control. We
- * fall back to GET_CUR if GET_DEF fails.
+ /* 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_DEF)) < 0 &&
- (ret = uvc_get_video_ctrl(video, probe, 1, GET_CUR)) < 0)
+ ret = uvc_get_video_ctrl(stream, probe, 1, UVC_GET_CUR);
+ if (ret < 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];
+ for (i = stream->nformats; i > 0; --i) {
+ format = &stream->format[i-1];
if (format->index == probe->bFormatIndex)
break;
}
/* 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 avalable frame.
+ * descriptor is not found, use the first available frame.
*/
for (i = format->nframes; i > 0; --i) {
frame = &format->frame[i-1];
probe->bFormatIndex = format->index;
probe->bFrameIndex = frame->bFrameIndex;
- video->streaming->cur_format = format;
- video->streaming->cur_frame = frame;
- atomic_set(&video->active, 0);
+ stream->cur_format = format;
+ stream->cur_frame = frame;
/* 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;
+ if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ if (stream->dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)
+ stream->decode = uvc_video_decode_isight;
+ else if (stream->intf->num_altsetting > 1)
+ stream->decode = uvc_video_decode_isoc;
else
- video->decode = uvc_video_decode_bulk;
+ stream->decode = uvc_video_decode_bulk;
} else {
- if (video->streaming->intf->num_altsetting == 1)
- video->decode = uvc_video_encode_bulk;
+ if (stream->intf->num_altsetting == 1)
+ stream->decode = uvc_video_encode_bulk;
else {
uvc_printk(KERN_INFO, "Isochronous endpoints are not "
"supported for video output devices.\n");
/*
* Enable or disable the video stream.
*/
-int uvc_video_enable(struct uvc_video_device *video, int enable)
+int uvc_video_enable(struct uvc_streaming *stream, 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);
+ uvc_uninit_video(stream, 1);
+ usb_set_interface(stream->dev->udev, stream->intfnum, 0);
+ uvc_queue_enable(&stream->queue, 0);
return 0;
}
- if ((video->streaming->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) ||
+ if ((stream->cur_format->flags & UVC_FMT_FLAG_COMPRESSED) ||
uvc_no_drop_param)
- video->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE;
+ stream->queue.flags &= ~UVC_QUEUE_DROP_INCOMPLETE;
else
- video->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
+ stream->queue.flags |= UVC_QUEUE_DROP_INCOMPLETE;
- if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
+ ret = uvc_queue_enable(&stream->queue, 1);
+ if (ret < 0)
return ret;
/* Commit the streaming parameters. */
- if ((ret = uvc_commit_video(video, &video->streaming->ctrl)) < 0)
+ ret = uvc_commit_video(stream, &stream->ctrl);
+ if (ret < 0)
return ret;
- return uvc_init_video(video, GFP_KERNEL);
+ return uvc_init_video(stream, GFP_KERNEL);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff