| /* |
| * uvc_video.c -- USB Video Class driver - Video handling |
| * |
| * Copyright (C) 2005-2008 |
| * 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/version.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; |
| int ret; |
| |
| pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) |
| : usb_sndctrlpipe(dev->udev, 0); |
| type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; |
| |
| ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8, |
| unit << 8 | intfnum, data, size, 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; |
| } |
| |
| int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, |
| __u8 intfnum, __u8 cs, void *data, __u16 size) |
| { |
| return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, |
| UVC_CTRL_CONTROL_TIMEOUT); |
| } |
| |
| static void uvc_fixup_buffer_size(struct uvc_video_device *video, |
| struct uvc_streaming_control *ctrl) |
| { |
| struct uvc_format *format; |
| struct uvc_frame *frame; |
| |
| if (ctrl->bFormatIndex <= 0 || |
| ctrl->bFormatIndex > video->streaming->nformats) |
| return; |
| |
| format = &video->streaming->format[ctrl->bFormatIndex - 1]; |
| |
| if (ctrl->bFrameIndex <= 0 || |
| ctrl->bFrameIndex > format->nframes) |
| return; |
| |
| frame = &format->frame[ctrl->bFrameIndex - 1]; |
| |
| if (!(format->flags & UVC_FMT_FLAG_COMPRESSED) || |
| (ctrl->dwMaxVideoFrameSize == 0 && |
| video->dev->uvc_version < 0x0110)) |
| ctrl->dwMaxVideoFrameSize = |
| frame->dwMaxVideoFrameBufferSize; |
| } |
| |
| 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 (ret < 0) |
| 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 = |
| le32_to_cpu(get_unaligned((__le32 *)&data[18])); |
| ctrl->dwMaxPayloadTransferSize = |
| le32_to_cpu(get_unaligned((__le32 *)&data[22])); |
| |
| if (size == 34) { |
| ctrl->dwClockFrequency = |
| le32_to_cpu(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 a null or wrong dwMaxVideoFrameSize. |
| * Try to get the value from the format and frame descriptor. |
| */ |
| uvc_fixup_buffer_size(video, ctrl); |
| |
| out: |
| kfree(data); |
| return ret; |
| } |
| |
| 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); |
| /* 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(cpu_to_le32(ctrl->dwMaxVideoFrameSize), |
| (__le32 *)&data[18]); |
| put_unaligned(cpu_to_le32(ctrl->dwMaxPayloadTransferSize), |
| (__le32 *)&data[22]); |
| |
| if (size == 34) { |
| put_unaligned(cpu_to_le32(ctrl->dwClockFrequency), |
| (__le32 *)&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); |
| |
| 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; |
| } |
| |
| /* ------------------------------------------------------------------------ |
| * 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. |
| * queue->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. |
| * |
| * queue->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 |
| * 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; |
| } |
| } |
| |
| /* ------------------------------------------------------------------------ |
| * 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; |
| |
| 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) { |
| 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; |
| return; |
| } |
| |
| video->bulk.header_size = ret; |
| memcpy(video->bulk.header, mem, video->bulk.header_size); |
| |
| 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_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. |
| * |
| * Return 0 on success or -ENOMEM when out of memory. |
| */ |
| static int uvc_alloc_urb_buffers(struct uvc_video_device *video, |
| unsigned int size) |
| { |
| unsigned int i; |
| |
| /* Buffers are already allocated, bail out. */ |
| if (video->urb_size) |
| return 0; |
| |
| 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; |
| } |
| } |
| |
| video->urb_size = size; |
| 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; |
| |
| /* 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 = 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; |
| |
| 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); |
| 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 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. |
| */ |
| 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; |
| |
| if (uvc_alloc_urb_buffers(video, size) < 0) |
| return -ENOMEM; |
| |
| pipe = usb_rcvbulkpipe(video->dev->udev, ep->desc.bEndpointAddress); |
| |
| 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 enable |
| * 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_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 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 retrieving the default format and |
| * committing it. |
| * |
| * 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); |
| |
| /* Some webcams don't suport GET_DEF request on the probe control. We |
| * fall back to GET_CUR if GET_DEF fails. |
| */ |
| if ((ret = uvc_get_video_ctrl(video, probe, 1, GET_DEF)) < 0 && |
| (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 avalable frame. |
| */ |
| for (i = format->nframes; i > 0; --i) { |
| frame = &format->frame[i-1]; |
| if (frame->bFrameIndex == probe->bFrameIndex) |
| break; |
| } |
| |
| /* Commit the default settings. */ |
| probe->bFormatIndex = format->index; |
| probe->bFrameIndex = frame->bFrameIndex; |
| if ((ret = uvc_set_video_ctrl(video, probe, 0)) < 0) |
| return ret; |
| |
| video->streaming->cur_format = format; |
| video->streaming->cur_frame = frame; |
| atomic_set(&video->active, 0); |
| |
| /* Select the video decoding function */ |
| 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; |
| |
| 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 ((ret = uvc_queue_enable(&video->queue, 1)) < 0) |
| return ret; |
| |
| return uvc_init_video(video, GFP_KERNEL); |
| } |
| |