diff options
Diffstat (limited to 'drivers/media/video/uvc/uvc_driver.c')
| -rw-r--r-- | drivers/media/video/uvc/uvc_driver.c | 109 |
1 files changed, 75 insertions, 34 deletions
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c index 18a61928f4f..89d8bd10a85 100644 --- a/drivers/media/video/uvc/uvc_driver.c +++ b/drivers/media/video/uvc/uvc_driver.c @@ -12,8 +12,8 @@ */ /* - * This driver aims to support video input devices compliant with the 'USB - * Video Class' specification. + * This driver aims to support video input and ouput devices compliant with the + * 'USB Video Class' specification. * * The driver doesn't support the deprecated v4l1 interface. It implements the * mmap capture method only, and doesn't do any image format conversion in @@ -609,46 +609,55 @@ static int uvc_parse_streaming(struct uvc_device *dev, } /* Parse the header descriptor. */ - if (buffer[2] == VS_OUTPUT_HEADER) { + switch (buffer[2]) { + case VS_OUTPUT_HEADER: + streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT; + size = 9; + break; + + case VS_INPUT_HEADER: + streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + size = 13; + break; + + default: uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface " - "%d OUTPUT HEADER descriptor is not supported.\n", - dev->udev->devnum, alts->desc.bInterfaceNumber); + "%d HEADER descriptor not found.\n", dev->udev->devnum, + alts->desc.bInterfaceNumber); goto error; - } else if (buffer[2] == VS_INPUT_HEADER) { - p = buflen >= 5 ? buffer[3] : 0; - n = buflen >= 12 ? buffer[12] : 0; + } - if (buflen < 13 + p*n || buffer[2] != VS_INPUT_HEADER) { - uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming " - "interface %d INPUT HEADER descriptor is " - "invalid.\n", dev->udev->devnum, - alts->desc.bInterfaceNumber); - goto error; - } + p = buflen >= 4 ? buffer[3] : 0; + n = buflen >= size ? buffer[size-1] : 0; + + if (buflen < size + p*n) { + uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming " + "interface %d HEADER descriptor is invalid.\n", + dev->udev->devnum, alts->desc.bInterfaceNumber); + goto error; + } - streaming->header.bNumFormats = p; - streaming->header.bEndpointAddress = buffer[6]; + streaming->header.bNumFormats = p; + streaming->header.bEndpointAddress = buffer[6]; + if (buffer[2] == VS_INPUT_HEADER) { streaming->header.bmInfo = buffer[7]; streaming->header.bTerminalLink = buffer[8]; streaming->header.bStillCaptureMethod = buffer[9]; streaming->header.bTriggerSupport = buffer[10]; streaming->header.bTriggerUsage = buffer[11]; - streaming->header.bControlSize = n; - - streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL); - if (streaming->header.bmaControls == NULL) { - ret = -ENOMEM; - goto error; - } - - memcpy(streaming->header.bmaControls, &buffer[13], p*n); } else { - uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming interface " - "%d HEADER descriptor not found.\n", dev->udev->devnum, - alts->desc.bInterfaceNumber); + streaming->header.bTerminalLink = buffer[7]; + } + streaming->header.bControlSize = n; + + streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL); + if (streaming->header.bmaControls == NULL) { + ret = -ENOMEM; goto error; } + memcpy(streaming->header.bmaControls, &buffer[size], p*n); + buflen -= buffer[0]; buffer += buffer[0]; @@ -1258,6 +1267,26 @@ static int uvc_scan_chain_entity(struct uvc_video_device *video, list_add_tail(&entity->chain, &video->iterms); break; + case TT_STREAMING: + if (uvc_trace_param & UVC_TRACE_PROBE) + printk(" <- IT %d\n", entity->id); + + if (!UVC_ENTITY_IS_ITERM(entity)) { + uvc_trace(UVC_TRACE_DESCR, "Unsupported input " + "terminal %u.\n", entity->id); + return -1; + } + + if (video->sterm != NULL) { + uvc_trace(UVC_TRACE_DESCR, "Found multiple streaming " + "entities in chain.\n"); + return -1; + } + + list_add_tail(&entity->chain, &video->iterms); + video->sterm = entity; + break; + default: uvc_trace(UVC_TRACE_DESCR, "Unsupported entity type " "0x%04x found in chain.\n", UVC_ENTITY_TYPE(entity)); @@ -1368,6 +1397,10 @@ static int uvc_scan_chain(struct uvc_video_device *video) entity = video->oterm; uvc_trace(UVC_TRACE_PROBE, "Scanning UVC chain: OT %d", entity->id); + + if (UVC_ENTITY_TYPE(entity) == TT_STREAMING) + video->sterm = entity; + id = entity->output.bSourceID; while (id != 0) { prev = entity; @@ -1396,8 +1429,11 @@ static int uvc_scan_chain(struct uvc_video_device *video) return id; } - /* Initialize the video buffers queue. */ - uvc_queue_init(&video->queue); + if (video->sterm == NULL) { + uvc_trace(UVC_TRACE_DESCR, "No streaming entity found in " + "chain.\n"); + return -1; + } return 0; } @@ -1408,7 +1444,8 @@ static int uvc_scan_chain(struct uvc_video_device *video) * The driver currently supports a single video device per control interface * only. The terminal and units must match the following structure: * - * ITT_CAMERA -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING + * ITT_* -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> TT_STREAMING + * TT_STREAMING -> VC_PROCESSING_UNIT -> VC_EXTENSION_UNIT{0,n} -> OTT_* * * The Extension Units, if present, must have a single input pin. The * Processing Unit and Extension Units can be in any order. Additional @@ -1425,7 +1462,7 @@ static int uvc_register_video(struct uvc_device *dev) list_for_each_entry(term, &dev->entities, list) { struct uvc_streaming *streaming; - if (UVC_ENTITY_TYPE(term) != TT_STREAMING) + if (!UVC_ENTITY_IS_TERM(term) || !UVC_ENTITY_IS_OTERM(term)) continue; memset(&dev->video, 0, sizeof dev->video); @@ -1438,7 +1475,8 @@ static int uvc_register_video(struct uvc_device *dev) continue; list_for_each_entry(streaming, &dev->streaming, list) { - if (streaming->header.bTerminalLink == term->id) { + if (streaming->header.bTerminalLink == + dev->video.sterm->id) { dev->video.streaming = streaming; found = 1; break; @@ -1464,6 +1502,9 @@ static int uvc_register_video(struct uvc_device *dev) printk(" -> %d).\n", dev->video.oterm->id); } + /* Initialize the video buffers queue. */ + uvc_queue_init(&dev->video.queue, dev->video.streaming->type); + /* Initialize the streaming interface with default streaming * parameters. */ |