diff options
Diffstat (limited to 'drivers/media/video/uvc')
| -rw-r--r-- | drivers/media/video/uvc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/media/video/uvc/Makefile | 2 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_ctrl.c | 19 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_debugfs.c | 136 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_driver.c | 30 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_isight.c | 10 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_queue.c | 564 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_v4l2.c | 29 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 625 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvcvideo.h | 128 |
10 files changed, 1041 insertions, 503 deletions
diff --git a/drivers/media/video/uvc/Kconfig b/drivers/media/video/uvc/Kconfig index 2956a76..6c197da 100644 --- a/drivers/media/video/uvc/Kconfig +++ b/drivers/media/video/uvc/Kconfig @@ -1,5 +1,6 @@ config USB_VIDEO_CLASS tristate "USB Video Class (UVC)" + select VIDEOBUF2_VMALLOC ---help--- Support for the USB Video Class (UVC). Currently only video input devices, such as webcams, are supported. diff --git a/drivers/media/video/uvc/Makefile b/drivers/media/video/uvc/Makefile index 2071ca8..c26d12f 100644 --- a/drivers/media/video/uvc/Makefile +++ b/drivers/media/video/uvc/Makefile @@ -1,5 +1,5 @@ uvcvideo-objs := uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \ - uvc_status.o uvc_isight.o + uvc_status.o uvc_isight.o uvc_debugfs.o ifeq ($(CONFIG_MEDIA_CONTROLLER),y) uvcvideo-objs += uvc_entity.o endif diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c index 254d326..0efd3b1 100644 --- a/drivers/media/video/uvc/uvc_ctrl.c +++ b/drivers/media/video/uvc/uvc_ctrl.c @@ -878,8 +878,21 @@ static int uvc_ctrl_populate_cache(struct uvc_video_chain *chain, chain->dev->intfnum, ctrl->info.selector, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), ctrl->info.size); - if (ret < 0) - return ret; + if (ret < 0) { + if (UVC_ENTITY_TYPE(ctrl->entity) != + UVC_VC_EXTENSION_UNIT) + return ret; + + /* GET_RES is mandatory for XU controls, but some + * cameras still choke on it. Ignore errors and set the + * resolution value to zero. + */ + uvc_warn_once(chain->dev, UVC_WARN_XU_GET_RES, + "UVC non compliance - GET_RES failed on " + "an XU control. Enabling workaround.\n"); + memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES), 0, + ctrl->info.size); + } } ctrl->cached = 1; @@ -1861,7 +1874,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev) if (ncontrols == 0) continue; - entity->controls = kzalloc(ncontrols * sizeof(*ctrl), + entity->controls = kcalloc(ncontrols, sizeof(*ctrl), GFP_KERNEL); if (entity->controls == NULL) return -ENOMEM; diff --git a/drivers/media/video/uvc/uvc_debugfs.c b/drivers/media/video/uvc/uvc_debugfs.c new file mode 100644 index 0000000..14561a5 --- /dev/null +++ b/drivers/media/video/uvc/uvc_debugfs.c @@ -0,0 +1,136 @@ +/* + * uvc_debugfs.c -- USB Video Class driver - Debugging support + * + * Copyright (C) 2011 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * 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/module.h> +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <linux/usb.h> + +#include "uvcvideo.h" + +/* ----------------------------------------------------------------------------- + * Statistics + */ + +#define UVC_DEBUGFS_BUF_SIZE 1024 + +struct uvc_debugfs_buffer { + size_t count; + char data[UVC_DEBUGFS_BUF_SIZE]; +}; + +static int uvc_debugfs_stats_open(struct inode *inode, struct file *file) +{ + struct uvc_streaming *stream = inode->i_private; + struct uvc_debugfs_buffer *buf; + + buf = kmalloc(sizeof(*buf), GFP_KERNEL); + if (buf == NULL) + return -ENOMEM; + + buf->count = uvc_video_stats_dump(stream, buf->data, sizeof(buf->data)); + + file->private_data = buf; + return 0; +} + +static ssize_t uvc_debugfs_stats_read(struct file *file, char __user *user_buf, + size_t nbytes, loff_t *ppos) +{ + struct uvc_debugfs_buffer *buf = file->private_data; + + return simple_read_from_buffer(user_buf, nbytes, ppos, buf->data, + buf->count); +} + +static int uvc_debugfs_stats_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + file->private_data = NULL; + + return 0; +} + +static const struct file_operations uvc_debugfs_stats_fops = { + .owner = THIS_MODULE, + .open = uvc_debugfs_stats_open, + .llseek = no_llseek, + .read = uvc_debugfs_stats_read, + .release = uvc_debugfs_stats_release, +}; + +/* ----------------------------------------------------------------------------- + * Global and stream initialization/cleanup + */ + +static struct dentry *uvc_debugfs_root_dir; + +int uvc_debugfs_init_stream(struct uvc_streaming *stream) +{ + struct usb_device *udev = stream->dev->udev; + struct dentry *dent; + char dir_name[32]; + + if (uvc_debugfs_root_dir == NULL) + return -ENODEV; + + sprintf(dir_name, "%u-%u", udev->bus->busnum, udev->devnum); + + dent = debugfs_create_dir(dir_name, uvc_debugfs_root_dir); + if (IS_ERR_OR_NULL(dent)) { + uvc_printk(KERN_INFO, "Unable to create debugfs %s " + "directory.\n", dir_name); + return -ENODEV; + } + + stream->debugfs_dir = dent; + + dent = debugfs_create_file("stats", 0444, stream->debugfs_dir, + stream, &uvc_debugfs_stats_fops); + if (IS_ERR_OR_NULL(dent)) { + uvc_printk(KERN_INFO, "Unable to create debugfs stats file.\n"); + uvc_debugfs_cleanup_stream(stream); + return -ENODEV; + } + + return 0; +} + +void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream) +{ + if (stream->debugfs_dir == NULL) + return; + + debugfs_remove_recursive(stream->debugfs_dir); + stream->debugfs_dir = NULL; +} + +int uvc_debugfs_init(void) +{ + struct dentry *dir; + + dir = debugfs_create_dir("uvcvideo", usb_debug_root); + if (IS_ERR_OR_NULL(dir)) { + uvc_printk(KERN_INFO, "Unable to create debugfs directory\n"); + return -ENODATA; + } + + uvc_debugfs_root_dir = dir; + return 0; +} + +void uvc_debugfs_cleanup(void) +{ + if (uvc_debugfs_root_dir != NULL) + debugfs_remove_recursive(uvc_debugfs_root_dir); +} diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c index 656d4c9..a240d43 100644 --- a/drivers/media/video/uvc/uvc_driver.c +++ b/drivers/media/video/uvc/uvc_driver.c @@ -1675,6 +1675,8 @@ static void uvc_unregister_video(struct uvc_device *dev) video_unregister_device(stream->vdev); stream->vdev = NULL; + + uvc_debugfs_cleanup_stream(stream); } /* Decrement the stream count and call uvc_delete explicitly if there @@ -1700,6 +1702,8 @@ static int uvc_register_video(struct uvc_device *dev, return ret; } + uvc_debugfs_init_stream(stream); + /* Register the device with V4L. */ vdev = video_device_alloc(); if (vdev == NULL) { @@ -2033,6 +2037,15 @@ MODULE_PARM_DESC(timeout, "Streaming control requests timeout"); * though they are compliant. */ static struct usb_device_id uvc_ids[] = { + /* LogiLink Wireless Webcam */ + { .match_flags = USB_DEVICE_ID_MATCH_DEVICE + | USB_DEVICE_ID_MATCH_INT_INFO, + .idVendor = 0x0416, + .idProduct = 0xa91a, + .bInterfaceClass = USB_CLASS_VIDEO, + .bInterfaceSubClass = 1, + .bInterfaceProtocol = 0, + .driver_info = UVC_QUIRK_PROBE_MINMAX }, /* Genius eFace 2025 */ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_INFO, @@ -2396,17 +2409,24 @@ struct uvc_driver uvc_driver = { static int __init uvc_init(void) { - int result; + int ret; + + uvc_debugfs_init(); - result = usb_register(&uvc_driver.driver); - if (result == 0) - printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n"); - return result; + ret = usb_register(&uvc_driver.driver); + if (ret < 0) { + uvc_debugfs_cleanup(); + return ret; + } + + printk(KERN_INFO DRIVER_DESC " (" DRIVER_VERSION ")\n"); + return 0; } static void __exit uvc_cleanup(void) { usb_deregister(&uvc_driver.driver); + uvc_debugfs_cleanup(); } module_init(uvc_init); diff --git a/drivers/media/video/uvc/uvc_isight.c b/drivers/media/video/uvc/uvc_isight.c index 74bbe8f..8510e725 100644 --- a/drivers/media/video/uvc/uvc_isight.c +++ b/drivers/media/video/uvc/uvc_isight.c @@ -74,7 +74,7 @@ static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf, * Empty buffers (bytesused == 0) don't trigger end of frame detection * as it doesn't make sense to return an empty buffer. */ - if (is_header && buf->buf.bytesused != 0) { + if (is_header && buf->bytesused != 0) { buf->state = UVC_BUF_STATE_DONE; return -EAGAIN; } @@ -83,13 +83,13 @@ static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf, * contain no data. */ if (!is_header) { - maxlen = buf->buf.length - buf->buf.bytesused; - mem = queue->mem + buf->buf.m.offset + buf->buf.bytesused; + maxlen = buf->length - buf->bytesused; + mem = buf->mem + buf->bytesused; nbytes = min(len, maxlen); memcpy(mem, data, nbytes); - buf->buf.bytesused += nbytes; + buf->bytesused += nbytes; - if (len > maxlen || buf->buf.bytesused == buf->buf.length) { + if (len > maxlen || buf->bytesused == buf->length) { uvc_trace(UVC_TRACE_FRAME, "Frame complete " "(overflow).\n"); buf->state = UVC_BUF_STATE_DONE; diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c index 677691c..518f77d 100644 --- a/drivers/media/video/uvc/uvc_queue.c +++ b/drivers/media/video/uvc/uvc_queue.c @@ -11,6 +11,7 @@ * */ +#include <linux/atomic.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/list.h> @@ -19,7 +20,7 @@ #include <linux/videodev2.h> #include <linux/vmalloc.h> #include <linux/wait.h> -#include <linux/atomic.h> +#include <media/videobuf2-vmalloc.h> #include "uvcvideo.h" @@ -29,467 +30,211 @@ * Video queues is initialized by uvc_queue_init(). The function performs * basic initialization of the uvc_video_queue struct and never fails. * - * Video buffer allocation and freeing are performed by uvc_alloc_buffers and - * uvc_free_buffers respectively. The former acquires the video queue lock, - * while the later must be called with the lock held (so that allocation can - * free previously allocated buffers). Trying to free buffers that are mapped - * to user space will return -EBUSY. - * - * Video buffers are managed using two queues. However, unlike most USB video - * drivers that use an in queue and an out queue, we use a main queue to hold - * all queued buffers (both 'empty' and 'done' buffers), and an irq queue to - * hold empty buffers. This design (copied from video-buf) minimizes locking - * in interrupt, as only one queue is shared between interrupt and user - * contexts. - * - * Use cases - * --------- - * - * Unless stated otherwise, all operations that modify the irq buffers queue - * are protected by the irq spinlock. - * - * 1. The user queues the buffers, starts streaming and dequeues a buffer. - * - * The buffers are added to the main and irq queues. Both operations are - * protected by the queue lock, and the later is protected by the irq - * spinlock as well. - * - * The completion handler fetches a buffer from the irq queue and fills it - * with video data. If no buffer is available (irq queue empty), the handler - * returns immediately. - * - * When the buffer is full, the completion handler removes it from the irq - * queue, marks it as done (UVC_BUF_STATE_DONE) and wakes its wait queue. - * At that point, any process waiting on the buffer will be woken up. If a - * process tries to dequeue a buffer after it has been marked done, the - * dequeing will succeed immediately. - * - * 2. Buffers are queued, user is waiting on a buffer and the device gets - * disconnected. - * - * When the device is disconnected, the kernel calls the completion handler - * with an appropriate status code. The handler marks all buffers in the - * irq queue as being erroneous (UVC_BUF_STATE_ERROR) and wakes them up so - * that any process waiting on a buffer gets woken up. - * - * Waking up up the first buffer on the irq list is not enough, as the - * process waiting on the buffer might restart the dequeue operation - * immediately. - * + * Video buffers are managed by videobuf2. The driver uses a mutex to protect + * the videobuf2 queue operations by serializing calls to videobuf2 and a + * spinlock to protect the IRQ queue that holds the buffers to be processed by + * the driver. */ -void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, - int drop_corrupted) -{ - mutex_init(&queue->mutex); - spin_lock_init(&queue->irqlock); - INIT_LIST_HEAD(&queue->mainqueue); - INIT_LIST_HEAD(&queue->irqqueue); - queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0; - queue->type = type; -} - -/* - * Free the video buffers. - * - * This function must be called with the queue lock held. +/* ----------------------------------------------------------------------------- + * videobuf2 queue operations */ -static int __uvc_free_buffers(struct uvc_video_queue *queue) + +static int uvc_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, + unsigned int *nbuffers, unsigned int *nplanes, + unsigned int sizes[], void *alloc_ctxs[]) { - unsigned int i; + struct uvc_video_queue *queue = vb2_get_drv_priv(vq); + struct uvc_streaming *stream = + container_of(queue, struct uvc_streaming, queue); - for (i = 0; i < queue->count; ++i) { - if (queue->buffer[i].vma_use_count != 0) - return -EBUSY; - } + if (*nbuffers > UVC_MAX_VIDEO_BUFFERS) + *nbuffers = UVC_MAX_VIDEO_BUFFERS; - if (queue->count) { - uvc_queue_cancel(queue, 0); - INIT_LIST_HEAD(&queue->mainqueue); - vfree(queue->mem); - queue->count = 0; - } + *nplanes = 1; + + sizes[0] = stream->ctrl.dwMaxVideoFrameSize; return 0; } -int uvc_free_buffers(struct uvc_video_queue *queue) +static int uvc_buffer_prepare(struct vb2_buffer *vb) { - int ret; + struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue); + struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf); - mutex_lock(&queue->mutex); - ret = __uvc_free_buffers(queue); - mutex_unlock(&queue->mutex); + if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_OUTPUT && + vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) { + uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n"); + return -EINVAL; + } - return ret; -} + if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED)) + return -ENODEV; -/* - * Allocate the video buffers. - * - * Pages are reserved to make sure they will not be swapped, as they will be - * filled in the URB completion handler. - * - * Buffers will be individually mapped, so they must all be page aligned. - */ -int uvc_alloc_buffers(struct uvc_video_queue *queue, unsigned int nbuffers, - unsigned int buflength) -{ - unsigned int bufsize = PAGE_ALIGN(buflength); - unsigned int i; - void *mem = NULL; - int ret; + buf->state = UVC_BUF_STATE_QUEUED; + buf->error = 0; + buf->mem = vb2_plane_vaddr(vb, 0); + buf->length = vb2_plane_size(vb, 0); + if (vb->v4l2_buf.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) + buf->bytesused = 0; + else + buf->bytesused = vb2_get_plane_payload(vb, 0); - if (nbuffers > UVC_MAX_VIDEO_BUFFERS) - nbuffers = UVC_MAX_VIDEO_BUFFERS; + return 0; +} - mutex_lock(&queue->mutex); +static void uvc_buffer_queue(struct vb2_buffer *vb) +{ + struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue); + struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf); + unsigned long flags; - if ((ret = __uvc_free_buffers(queue)) < 0) - goto done; + spin_lock_irqsave(&queue->irqlock, flags); + if (likely(!(queue->flags & UVC_QUEUE_DISCONNECTED))) { + list_add_tail(&buf->queue, &queue->irqqueue); + } else { + /* If the device is disconnected return the buffer to userspace + * directly. The next QBUF call will fail with -ENODEV. + */ + buf->state = UVC_BUF_STATE_ERROR; + vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR); + } - /* Bail out if no buffers should be allocated. */ - if (nbuffers == 0) - goto done; + spin_unlock_irqrestore(&queue->irqlock, flags); +} - /* Decrement the number of buffers until allocation succeeds. */ - for (; nbuffers > 0; --nbuffers) { - mem = vmalloc_32(nbuffers * bufsize); - if (mem != NULL) - break; - } +static int uvc_buffer_finish(struct vb2_buffer *vb) +{ + struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue); + struct uvc_streaming *stream = + container_of(queue, struct uvc_streaming, queue); + struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf); - if (mem == NULL) { - ret = -ENOMEM; - goto done; - } + uvc_video_clock_update(stream, &vb->v4l2_buf, buf); + return 0; +} - for (i = 0; i < nbuffers; ++i) { - memset(&queue->buffer[i], 0, sizeof queue->buffer[i]); - queue->buffer[i].buf.index = i; - queue->buffer[i].buf.m.offset = i * bufsize; - queue->buffer[i].buf.length = buflength; - queue->buffer[i].buf.type = queue->type; - queue->buffer[i].buf.field = V4L2_FIELD_NONE; - queue->buffer[i].buf.memory = V4L2_MEMORY_MMAP; - queue->buffer[i].buf.flags = 0; - init_waitqueue_head(&queue->buffer[i].wait); - } +static struct vb2_ops uvc_queue_qops = { + .queue_setup = uvc_queue_setup, + .buf_prepare = uvc_buffer_prepare, + .buf_queue = uvc_buffer_queue, + .buf_finish = uvc_buffer_finish, +}; - queue->mem = mem; - queue->count = nbuffers; - queue->buf_size = bufsize; - ret = nbuffers; +void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, + int drop_corrupted) +{ + queue->queue.type = type; + queue->queue.io_modes = VB2_MMAP; + queue->queue.drv_priv = queue; + queue->queue.buf_struct_size = sizeof(struct uvc_buffer); + queue->queue.ops = &uvc_queue_qops; + queue->queue.mem_ops = &vb2_vmalloc_memops; + vb2_queue_init(&queue->queue); -done: - mutex_unlock(&queue->mutex); - return ret; + mutex_init(&queue->mutex); + spin_lock_init(&queue->irqlock); + INIT_LIST_HEAD(&queue->irqqueue); + queue->flags = drop_corrupted ? UVC_QUEUE_DROP_CORRUPTED : 0; } -/* - * Check if buffers have been allocated. +/* ----------------------------------------------------------------------------- + * V4L2 queue operations */ -int uvc_queue_allocated(struct uvc_video_queue *queue) + +int uvc_alloc_buffers(struct uvc_video_queue *queue, + struct v4l2_requestbuffers *rb) { - int allocated; + int ret; mutex_lock(&queue->mutex); - allocated = queue->count != 0; + ret = vb2_reqbufs(&queue->queue, rb); mutex_unlock(&queue->mutex); - return allocated; + return ret ? ret : rb->count; } -static void __uvc_query_buffer(struct uvc_buffer *buf, - struct v4l2_buffer *v4l2_buf) +void uvc_free_buffers(struct uvc_video_queue *queue) { - memcpy(v4l2_buf, &buf->buf, sizeof *v4l2_buf); - - if (buf->vma_use_count) - v4l2_buf->flags |= V4L2_BUF_FLAG_MAPPED; - - switch (buf->state) { - case UVC_BUF_STATE_ERROR: - case UVC_BUF_STATE_DONE: - v4l2_buf->flags |= V4L2_BUF_FLAG_DONE; - break; - case UVC_BUF_STATE_QUEUED: - case UVC_BUF_STATE_ACTIVE: - case UVC_BUF_STATE_READY: - v4l2_buf->flags |= V4L2_BUF_FLAG_QUEUED; - break; - case UVC_BUF_STATE_IDLE: - default: - break; - } + mutex_lock(&queue->mutex); + vb2_queue_release(&queue->queue); + mutex_unlock(&queue->mutex); } -int uvc_query_buffer(struct uvc_video_queue *queue, - struct v4l2_buffer *v4l2_buf) +int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf) { - int ret = 0; + int ret; mutex_lock(&queue->mutex); - if (v4l2_buf->index >= queue->count) { - ret = -EINVAL; - goto done; - } - - __uvc_query_buffer(&queue->buffer[v4l2_buf->index], v4l2_buf); - -done: + ret = vb2_querybuf(&queue->queue, buf); mutex_unlock(&queue->mutex); + return ret; } -/* - * Queue a video buffer. Attempting to queue a buffer that has already been - * queued will return -EINVAL. - */ -int uvc_queue_buffer(struct uvc_video_queue *queue, - struct v4l2_buffer *v4l2_buf) +int uvc_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf) { - struct uvc_buffer *buf; - unsigned long flags; - int ret = 0; - - uvc_trace(UVC_TRACE_CAPTURE, "Queuing buffer %u.\n", v4l2_buf->index); - - if (v4l2_buf->type != queue->type || - v4l2_buf->memory != V4L2_MEMORY_MMAP) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) " - "and/or memory (%u).\n", v4l2_buf->type, - v4l2_buf->memory); - return -EINVAL; - } + int ret; mutex_lock(&queue->mutex); - if (v4l2_buf->index >= queue->count) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Out of range index.\n"); - ret = -EINVAL; - goto done; - } - - buf = &queue->buffer[v4l2_buf->index]; - if (buf->state != UVC_BUF_STATE_IDLE) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state " - "(%u).\n", buf->state); - ret = -EINVAL; - goto done; - } - - if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT && - v4l2_buf->bytesused > buf->buf.length) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n"); - ret = -EINVAL; - goto done; - } - - spin_lock_irqsave(&queue->irqlock, flags); - if (queue->flags & UVC_QUEUE_DISCONNECTED) { - spin_unlock_irqrestore(&queue->irqlock, flags); - ret = -ENODEV; - goto done; - } - buf->state = UVC_BUF_STATE_QUEUED; - if (v4l2_buf->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) - buf->buf.bytesused = 0; - else - buf->buf.bytesused = v4l2_buf->bytesused; - - list_add_tail(&buf->stream, &queue->mainqueue); - list_add_tail(&buf->queue, &queue->irqqueue); - spin_unlock_irqrestore(&queue->irqlock, flags); - -done: + ret = vb2_qbuf(&queue->queue, buf); mutex_unlock(&queue->mutex); - return ret; -} -static int uvc_queue_waiton(struct uvc_buffer *buf, int nonblocking) -{ - if (nonblocking) { - return (buf->state != UVC_BUF_STATE_QUEUED && - buf->state != UVC_BUF_STATE_ACTIVE && - buf->state != UVC_BUF_STATE_READY) - ? 0 : -EAGAIN; - } - - return wait_event_interruptible(buf->wait, - buf->state != UVC_BUF_STATE_QUEUED && - buf->state != UVC_BUF_STATE_ACTIVE && - buf->state != UVC_BUF_STATE_READY); + return ret; } -/* - * Dequeue a video buffer. If nonblocking is false, block until a buffer is - * available. - */ -int uvc_dequeue_buffer(struct uvc_video_queue *queue, - struct v4l2_buffer *v4l2_buf, int nonblocking) +int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf, + int nonblocking) { - struct uvc_buffer *buf; - int ret = 0; - - if (v4l2_buf->type != queue->type || - v4l2_buf->memory != V4L2_MEMORY_MMAP) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer type (%u) " - "and/or memory (%u).\n", v4l2_buf->type, - v4l2_buf->memory); - return -EINVAL; - } + int ret; mutex_lock(&queue->mutex); - if (list_empty(&queue->mainqueue)) { - uvc_trace(UVC_TRACE_CAPTURE, "[E] Empty buffer queue.\n"); - ret = -EINVAL; - goto done; - } - - buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream); - if ((ret = uvc_queue_waiton(buf, nonblocking)) < 0) - goto done; - - uvc_trace(UVC_TRACE_CAPTURE, "Dequeuing buffer %u (%u, %u bytes).\n", - buf->buf.index, buf->state, buf->buf.bytesused); - - switch (buf->state) { - case UVC_BUF_STATE_ERROR: - uvc_trace(UVC_TRACE_CAPTURE, "[W] Corrupted data " - "(transmission error).\n"); - ret = -EIO; - case UVC_BUF_STATE_DONE: - buf->state = UVC_BUF_STATE_IDLE; - break; - - case UVC_BUF_STATE_IDLE: - case UVC_BUF_STATE_QUEUED: - case UVC_BUF_STATE_ACTIVE: - case UVC_BUF_STATE_READY: - default: - uvc_trace(UVC_TRACE_CAPTURE, "[E] Invalid buffer state %u " - "(driver bug?).\n", buf->state); - ret = -EINVAL; - goto done; - } - - list_del(&buf->stream); - __uvc_query_buffer(buf, v4l2_buf); - -done: + ret = vb2_dqbuf(&queue->queue, buf, nonblocking); mutex_unlock(&queue->mutex); - return ret; -} -/* - * VMA operations. - */ -static void uvc_vm_open(struct vm_area_struct *vma) -{ - struct uvc_buffer *buffer = vma->vm_private_data; - buffer->vma_use_count++; -} - -static void uvc_vm_close(struct vm_area_struct *vma) -{ - struct uvc_buffer *buffer = vma->vm_private_data; - buffer->vma_use_count--; + return ret; } -static const struct vm_operations_struct uvc_vm_ops = { - .open = uvc_vm_open, - .close = uvc_vm_close, -}; - -/* - * Memory-map a video buffer. - * - * This function implements video buffers memory mapping and is intended to be - * used by the device mmap handler. - */ int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma) { - struct uvc_buffer *uninitialized_var(buffer); - struct page *page; - unsigned long addr, start, size; - unsigned int i; - int ret = 0; - - start = vma->vm_start; - size = vma->vm_end - vma->vm_start; + int ret; mutex_lock(&queue->mutex); + ret = vb2_mmap(&queue->queue, vma); + mutex_unlock(&queue->mutex); - for (i = 0; i < queue->count; ++i) { - buffer = &queue->buffer[i]; - if ((buffer->buf.m.offset >> PAGE_SHIFT) == vma->vm_pgoff) - break; - } - - if (i == queue->count || PAGE_ALIGN(size) != queue->buf_size) { - ret = -EINVAL; - goto done; - } - - /* - * VM_IO marks the area as being an mmaped region for I/O to a - * device. It also prevents the region from being core dumped. - */ - vma->vm_flags |= VM_IO; - - addr = (unsigned long)queue->mem + buffer->buf.m.offset; -#ifdef CONFIG_MMU - while (size > 0) { - page = vmalloc_to_page((void *)addr); - if ((ret = vm_insert_page(vma, start, page)) < 0) - goto done; - - start += PAGE_SIZE; - addr += PAGE_SIZE; - size -= PAGE_SIZE; - } -#endif + return ret; +} - vma->vm_ops = &uvc_vm_ops; - vma->vm_private_data = buffer; - uvc_vm_open(vma); +unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, + poll_table *wait) +{ + unsigned int ret; -done: + mutex_lock(&queue->mutex); + ret = vb2_poll(&queue->queue, file, wait); mutex_unlock(&queue->mutex); + return ret; } -/* - * Poll the video queue. +/* ----------------------------------------------------------------------------- * - * This function implements video queue polling and is intended to be used by - * the device poll handler. */ -unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, - poll_table *wait) + +/* + * Check if buffers have been allocated. + */ +int uvc_queue_allocated(struct uvc_video_queue *queue) { - struct uvc_buffer *buf; - unsigned int mask = 0; + int allocated; mutex_lock(&queue->mutex); - if (list_empty(&queue->mainqueue)) { - mask |= POLLERR; - goto done; - } - buf = list_first_entry(&queue->mainqueue, struct uvc_buffer, stream); - - poll_wait(file, &buf->wait, wait); - if (buf->state == UVC_BUF_STATE_DONE || - buf->state == UVC_BUF_STATE_ERROR) { - if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) - mask |= POLLIN | POLLRDNORM; - else - mask |= POLLOUT | POLLWRNORM; - } - -done: + allocated = vb2_is_busy(&queue->queue); mutex_unlock(&queue->mutex); - return mask; + + return allocated; } #ifndef CONFIG_MMU @@ -515,7 +260,7 @@ unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue, ret = -EINVAL; goto done; } - ret = (unsigned long)queue->mem + buffer->buf.m.offset; + ret = (unsigned long)buf->mem; done: mutex_unlock(&queue->mutex); return ret; @@ -540,27 +285,24 @@ done: */ int uvc_queue_enable(struct uvc_video_queue *queue, int enable) { - unsigned int i; - int ret = 0; + unsigned long flags; + int ret; mutex_lock(&queue->mutex); if (enable) { - if (uvc_queue_streaming(queue)) { - ret = -EBUSY; + ret = vb2_streamon(&queue->queue, queue->queue.type); + if (ret < 0) goto done; - } - queue->flags |= UVC_QUEUE_STREAMING; + queue->buf_used = 0; } else { - uvc_queue_cancel(queue, 0); - INIT_LIST_HEAD(&queue->mainqueue); - - for (i = 0; i < queue->count; ++i) { - queue->buffer[i].error = 0; - queue->buffer[i].state = UVC_BUF_STATE_IDLE; - } + ret = vb2_streamoff(&queue->queue, queue->queue.type); + if (ret < 0) + goto done; - queue->flags &= ~UVC_QUEUE_STREAMING; + spin_lock_irqsave(&queue->irqlock, flags); + INIT_LIST_HEAD(&queue->irqqueue); + spin_unlock_irqrestore(&queue->irqlock, flags); } done: @@ -591,12 +333,12 @@ void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect) queue); list_del(&buf->queue); buf->state = UVC_BUF_STATE_ERROR; - wake_up(&buf->wait); + vb2_buffer_done(&buf->buf, VB2_BUF_STATE_ERROR); } /* This must be protected by the irqlock spinlock to avoid race - * conditions between uvc_queue_buffer and the disconnection event that + * conditions between uvc_buffer_queue and the disconnection event that * could result in an interruptible wait in uvc_dequeue_buffer. Do not - * blindly replace this logic by checking for the UVC_DEV_DISCONNECTED + * blindly replace this logic by checking for the UVC_QUEUE_DISCONNECTED * state outside the queue code. */ if (disconnect) @@ -613,14 +355,12 @@ struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue, if ((queue->flags & UVC_QUEUE_DROP_CORRUPTED) && buf->error) { buf->error = 0; buf->state = UVC_BUF_STATE_QUEUED; - buf->buf.bytesused = 0; + vb2_set_plane_payload(&buf->buf, 0, 0); return buf; } spin_lock_irqsave(&queue->irqlock, flags); list_del(&buf->queue); - buf->error = 0; - buf->state = UVC_BUF_STATE_DONE; if (!list_empty(&queue->irqqueue)) nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer, queue); @@ -628,7 +368,9 @@ struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue, nextbuf = NULL; spin_unlock_irqrestore(&queue->irqlock, flags); - wake_up(&buf->wait); + buf->state = buf->error ? VB2_BUF_STATE_ERROR : UVC_BUF_STATE_DONE; + vb2_set_plane_payload(&buf->buf, 0, buf->bytesused); + vb2_buffer_done(&buf->buf, VB2_BUF_STATE_DONE); + return nextbuf; } - diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index dadf11f..2ae4f88 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -58,6 +58,15 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain, break; case V4L2_CTRL_TYPE_MENU: + /* Prevent excessive memory consumption, as well as integer + * overflows. + */ + if (xmap->menu_count == 0 || + xmap->menu_count > UVC_MAX_CONTROL_MENU_ENTRIES) { + ret = -EINVAL; + goto done; + } + size = xmap->menu_count * sizeof(*map->menu_info); map->menu_info = kmalloc(size, GFP_KERNEL); if (map->menu_info == NULL) { @@ -513,10 +522,7 @@ static int uvc_v4l2_release(struct file *file) /* Only free resources if this is a privileged handle. */ if (uvc_has_privileges(handle)) { uvc_video_enable(stream, 0); - - if (uvc_free_buffers(&stream->queue) < 0) - uvc_printk(KERN_ERR, "uvc_v4l2_release: Unable to " - "free buffers.\n"); + uvc_free_buffers(&stream->queue); } /* Release the file handle. */ @@ -914,19 +920,11 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) /* Buffers & streaming */ case VIDIOC_REQBUFS: - { - struct v4l2_requestbuffers *rb = arg; - - if (rb->type != stream->type || - rb->memory != V4L2_MEMORY_MMAP) - return -EINVAL; - if ((ret = uvc_acquire_privileges(handle)) < 0) return ret; mutex_lock(&stream->mutex); - ret = uvc_alloc_buffers(&stream->queue, rb->count, - stream->ctrl.dwMaxVideoFrameSize); + ret = uvc_alloc_buffers(&stream->queue, arg); mutex_unlock(&stream->mutex); if (ret < 0) return ret; @@ -934,18 +932,13 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) if (ret == 0) uvc_dismiss_privileges(handle); - rb->count = ret; ret = 0; break; - } case VIDIOC_QUERYBUF: { struct v4l2_buffer *buf = arg; - if (buf->type != stream->type) - return -EINVAL; - if (!uvc_has_privileges(handle)) return -EBUSY; diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c index b015e8e..c7e69b8 100644 --- a/drivers/media/video/uvc/uvc_video.c +++ b/drivers/media/video/uvc/uvc_video.c @@ -351,25 +351,553 @@ done: return ret; } -int uvc_commit_video(struct uvc_streaming *stream, - struct uvc_streaming_control *probe) +static int uvc_commit_video(struct uvc_streaming *stream, + struct uvc_streaming_control *probe) { return uvc_set_video_ctrl(stream, probe, 0); } +/* ----------------------------------------------------------------------------- + * Clocks and timestamps + */ + +static void +uvc_video_clock_decode(struct uvc_streaming *stream, struct uvc_buffer *buf, + const __u8 *data, int len) +{ + struct uvc_clock_sample *sample; + unsigned int header_size; + bool has_pts = false; + bool has_scr = false; + unsigned long flags; + struct timespec ts; + u16 host_sof; + u16 dev_sof; + + switch (data[1] & (UVC_STREAM_PTS | UVC_STREAM_SCR)) { + case UVC_STREAM_PTS | UVC_STREAM_SCR: + header_size = 12; + has_pts = true; + has_scr = true; + break; + case UVC_STREAM_PTS: + header_size = 6; + has_pts = true; + break; + case UVC_STREAM_SCR: + header_size = 8; + has_scr = true; + break; + default: + header_size = 2; + break; + } + + /* Check for invalid headers. */ + if (len < header_size) + return; + + /* Extract the timestamps: + * + * - store the frame PTS in the buffer structure + * - if the SCR field is present, retrieve the host SOF counter and + * kernel timestamps and store them with the SCR STC and SOF fields + * in the ring buffer + */ + if (has_pts && buf != NULL) + buf->pts = get_unaligned_le32(&data[2]); + + if (!has_scr) + return; + + /* To limit the amount of data, drop SCRs with an SOF identical to the + * previous one. + */ + dev_sof = get_unaligned_le16(&data[header_size - 2]); + if (dev_sof == stream->clock.last_sof) + return; + + stream->clock.last_sof = dev_sof; + + host_sof = usb_get_current_frame_number(stream->dev->udev); + ktime_get_ts(&ts); + + /* The UVC specification allows device implementations that can't obtain + * the USB frame number to keep their own frame counters as long as they + * match the size and frequency of the frame number associated with USB + * SOF tokens. The SOF values sent by such devices differ from the USB + * SOF tokens by a fixed offset that needs to be estimated and accounted + * for to make timestamp recovery as accurate as possible. + * + * The offset is estimated the first time a device SOF value is received + * as the difference between the host and device SOF values. As the two + * SOF values can differ slightly due to transmission delays, consider + * that the offset is null if the difference is not higher than 10 ms + * (negative differences can not happen and are thus considered as an + * offset). The video commit control wDelay field should be used to + * compute a dynamic threshold instead of using a fixed 10 ms value, but + * devices don't report reliable wDelay values. + * + * See uvc_video_clock_host_sof() for an explanation regarding why only + * the 8 LSBs of the delta are kept. + */ + if (stream->clock.sof_offset == (u16)-1) { + u16 delta_sof = (host_sof - dev_sof) & 255; + if (delta_sof >= 10) + stream->clock.sof_offset = delta_sof; + else + stream->clock.sof_offset = 0; + } + + dev_sof = (dev_sof + stream->clock.sof_offset) & 2047; + + spin_lock_irqsave(&stream->clock.lock, flags); + + sample = &stream->clock.samples[stream->clock.head]; + sample->dev_stc = get_unaligned_le32(&data[header_size - 6]); + sample->dev_sof = dev_sof; + sample->host_sof = host_sof; + sample->host_ts = ts; + + /* Update the sliding window head and count. */ + stream->clock.head = (stream->clock.head + 1) % stream->clock.size; + + if (stream->clock.count < stream->clock.size) + stream->clock.count++; + + spin_unlock_irqrestore(&stream->clock.lock, flags); +} + +static int uvc_video_clock_init(struct uvc_streaming *stream) +{ + struct uvc_clock *clock = &stream->clock; + + spin_lock_init(&clock->lock); + clock->head = 0; + clock->count = 0; + clock->size = 32; + clock->last_sof = -1; + clock->sof_offset = -1; + + clock->samples = kmalloc(clock->size * sizeof(*clock->samples), + GFP_KERNEL); + if (clock->samples == NULL) + return -ENOMEM; + + return 0; +} + +static void uvc_video_clock_cleanup(struct uvc_streaming *stream) +{ + kfree(stream->clock.samples); + stream->clock.samples = NULL; +} + +/* + * uvc_video_clock_host_sof - Return the host SOF value for a clock sample + * + * Host SOF counters reported by usb_get_current_frame_number() usually don't + * cover the whole 11-bits SOF range (0-2047) but are limited to the HCI frame + * schedule window. They can be limited to 8, 9 or 10 bits depending on the host + * controller and its configuration. + * + * We thus need to recover the SOF value corresponding to the host frame number. + * As the device and host frame numbers are sampled in a short interval, the + * difference between their values should be equal to a small delta plus an + * integer multiple of 256 caused by the host frame number limited precision. + * + * To obtain the recovered host SOF value, compute the small delta by masking + * the high bits of the host frame counter and device SOF difference and add it + * to the device SOF value. + */ +static u16 uvc_video_clock_host_sof(const struct uvc_clock_sample *sample) +{ + /* The delta value can be negative. */ + s8 delta_sof; + + delta_sof = (sample->host_sof - sample->dev_sof) & 255; + + return (sample->dev_sof + delta_sof) & 2047; +} + +/* + * uvc_video_clock_update - Update the buffer timestamp + * + * This function converts the buffer PTS timestamp to the host clock domain by + * going through the USB SOF clock domain and stores the result in the V4L2 + * buffer timestamp field. + * + * The relationship between the device clock and the host clock isn't known. + * However, the device and the host share the common USB SOF clock which can be + * used to recover that relationship. + * + * The relationship between the device clock and the USB SOF clock is considered + * to be linear over the clock samples sliding window and is given by + * + * SOF = m * PTS + p + * + * Several methods to compute the slope (m) and intercept (p) can be used. As + * the clock drift should be small compared to the sliding window size, we + * assume that the line that goes through the points at both ends of the window + * is a good approximation. Naming those points P1 and P2, we get + * + * SOF = (SOF2 - SOF1) / (STC2 - STC1) * PTS + * + (SOF1 * STC2 - SOF2 * STC1) / (STC2 - STC1) + * + * or + * + * SOF = ((SOF2 - SOF1) * PTS + SOF1 * STC2 - SOF2 * STC1) / (STC2 - STC1) (1) + * + * to avoid loosing precision in the division. Similarly, the host timestamp is + * computed with + * + * TS = ((TS2 - TS1) * PTS + TS1 * SOF2 - TS2 * SOF1) / (SOF2 - SOF1) (2) + * + * SOF values are coded on 11 bits by USB. We extend their precision with 16 + * decimal bits, leading to a 11.16 coding. + * + * TODO: To avoid surprises with device clock values, PTS/STC timestamps should + * be normalized using the nominal device clock frequency reported through the + * UVC descriptors. + * + * Both the PTS/STC and SOF counters roll over, after a fixed but device + * specific amount of time for PTS/STC and after 2048ms for SOF. As long as the + * sliding window size is smaller than the rollover period, differences computed + * on unsigned integers will produce the correct result. However, the p term in + * the linear relations will be miscomputed. + * + * To fix the issue, we subtract a constant from the PTS and STC values to bring + * PTS to half the 32 bit STC range. The sliding window STC values then fit into + * the 32 bit range without any rollover. + * + * Similarly, we add 2048 to the device SOF values to make sure that the SOF + * computed by (1) will never be smaller than 0. This offset is then compensated + * by adding 2048 to the SOF values used in (2). However, this doesn't prevent + * rollovers between (1) and (2): the SOF value computed by (1) can be slightly + * lower than 4096, and the host SOF counters can have rolled over to 2048. This + * case is handled by subtracting 2048 from the SOF value if it exceeds the host + * SOF value at the end of the sliding window. + * + * Finally we subtract a constant from the host timestamps to bring the first + * timestamp of the sliding window to 1s. + */ +void uvc_video_clock_update(struct uvc_streaming *stream, + struct v4l2_buffer *v4l2_buf, + struct uvc_buffer *buf) +{ + struct uvc_clock *clock = &stream->clock; + struct uvc_clock_sample *first; + struct uvc_clock_sample *last; + unsigned long flags; + struct timespec ts; + u32 delta_stc; + u32 y1, y2; + u32 x1, x2; + u32 mean; + u32 sof; + u32 div; + u32 rem; + u64 y; + + spin_lock_irqsave(&clock->lock, flags); + + if (clock->count < clock->size) + goto done; + + first = &clock->samples[clock->head]; + last = &clock->samples[(clock->head - 1) % clock->size]; + + /* First step, PTS to SOF conversion. */ + delta_stc = buf->pts - (1UL << 31); + x1 = first->dev_stc - delta_stc; + x2 = last->dev_stc - delta_stc; + y1 = (first->dev_sof + 2048) << 16; + y2 = (last->dev_sof + 2048) << 16; + + if (y2 < y1) + y2 += 2048 << 16; + + y = (u64)(y2 - y1) * (1ULL << 31) + (u64)y1 * (u64)x2 + - (u64)y2 * (u64)x1; + y = div_u64(y, x2 - x1); + + sof = y; + + uvc_trace(UVC_TRACE_CLOCK, "%s: PTS %u y %llu.%06llu SOF %u.%06llu " + "(x1 %u x2 %u y1 %u y2 %u SOF offset %u)\n", + stream->dev->name, buf->pts, + y >> 16, div_u64((y & 0xffff) * 1000000, 65536), + sof >> 16, div_u64(((u64)sof & 0xffff) * 1000000LLU, 65536), + x1, x2, y1, y2, clock->sof_offset); + + /* Second step, SOF to host clock conversion. */ + ts = timespec_sub(last->host_ts, first->host_ts); + x1 = (uvc_video_clock_host_sof(first) + 2048) << 16; + x2 = (uvc_video_clock_host_sof(last) + 2048) << 16; + y1 = NSEC_PER_SEC; + y2 = (ts.tv_sec + 1) * NSEC_PER_SEC + ts.tv_nsec; + + if (x2 < x1) + x2 += 2048 << 16; + + /* Interpolated and host SOF timestamps can wrap around at slightly + * different times. Handle this by adding or removing 2048 to or from + * the computed SOF value to keep it close to the SOF samples mean + * value. + */ + mean = (x1 + x2) / 2; + if (mean - (1024 << 16) > sof) + sof += 2048 << 16; + else if (sof > mean + (1024 << 16)) + sof -= 2048 << 16; + + y = (u64)(y2 - y1) * (u64)sof + (u64)y1 * (u64)x2 + - (u64)y2 * (u64)x1; + y = div_u64(y, x2 - x1); + + div = div_u64_rem(y, NSEC_PER_SEC, &rem); + ts.tv_sec = first->host_ts.tv_sec - 1 + div; + ts.tv_nsec = first->host_ts.tv_nsec + rem; + if (ts.tv_nsec >= NSEC_PER_SEC) { + ts.tv_sec++; + ts.tv_nsec -= NSEC_PER_SEC; + } + + uvc_trace(UVC_TRACE_CLOCK, "%s: SOF %u.%06llu y %llu ts %lu.%06lu " + "buf ts %lu.%06lu (x1 %u/%u/%u x2 %u/%u/%u y1 %u y2 %u)\n", + stream->dev->name, + sof >> 16, div_u64(((u64)sof & 0xffff) * 1000000LLU, 65536), + y, ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC, + v4l2_buf->timestamp.tv_sec, v4l2_buf->timestamp.tv_usec, + x1, first->host_sof, first->dev_sof, + x2, last->host_sof, last->dev_sof, y1, y2); + + /* Update the V4L2 buffer. */ + v4l2_buf->timestamp.tv_sec = ts.tv_sec; + v4l2_buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; + +done: + spin_unlock_irqrestore(&stream->clock.lock, flags); +} + /* ------------------------------------------------------------------------ - * Video codecs + * Stream statistics */ -/* 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) +static void uvc_video_stats_decode(struct uvc_streaming *stream, + const __u8 *data, int len) +{ + unsigned int header_size; + bool has_pts = false; + bool has_scr = false; + u16 uninitialized_var(scr_sof); + u32 uninitialized_var(scr_stc); + u32 uninitialized_var(pts); + + if (stream->stats.stream.nb_frames == 0 && + stream->stats.frame.nb_packets == 0) + ktime_get_ts(&stream->stats.stream.start_ts); + + switch (data[1] & (UVC_STREAM_PTS | UVC_STREAM_SCR)) { + case UVC_STREAM_PTS | UVC_STREAM_SCR: + header_size = 12; + has_pts = true; + has_scr = true; + break; + case UVC_STREAM_PTS: + header_size = 6; + has_pts = true; + break; + case UVC_STREAM_SCR: + header_size = 8; + has_scr = true; + break; + default: + header_size = 2; + break; + } + + /* Check for invalid headers. */ + if (len < header_size || data[0] < header_size) { + stream->stats.frame.nb_invalid++; + return; + } + + /* Extract the timestamps. */ + if (has_pts) + pts = get_unaligned_le32(&data[2]); + + if (has_scr) { + scr_stc = get_unaligned_le32(&data[header_size - 6]); + scr_sof = get_unaligned_le16(&data[header_size - 2]); + } + + /* Is PTS constant through the whole frame ? */ + if (has_pts && stream->stats.frame.nb_pts) { + if (stream->stats.frame.pts != pts) { + stream->stats.frame.nb_pts_diffs++; + stream->stats.frame.last_pts_diff = + stream->stats.frame.nb_packets; + } + } + + if (has_pts) { + stream->stats.frame.nb_pts++; + stream->stats.frame.pts = pts; + } + + /* Do all frames have a PTS in their first non-empty packet, or before + * their first empty packet ? + */ + if (stream->stats.frame.size == 0) { + if (len > header_size) + stream->stats.frame.has_initial_pts = has_pts; + if (len == header_size && has_pts) + stream->stats.frame.has_early_pts = true; + } + + /* Do the SCR.STC and SCR.SOF fields vary through the frame ? */ + if (has_scr && stream->stats.frame.nb_scr) { + if (stream->stats.frame.scr_stc != scr_stc) + stream->stats.frame.nb_scr_diffs++; + } + + if (has_scr) { + /* Expand the SOF counter to 32 bits and store its value. */ + if (stream->stats.stream.nb_frames > 0 || + stream->stats.frame.nb_scr > 0) + stream->stats.stream.scr_sof_count += + (scr_sof - stream->stats.stream.scr_sof) % 2048; + stream->stats.stream.scr_sof = scr_sof; + + stream->stats.frame.nb_scr++; + stream->stats.frame.scr_stc = scr_stc; + stream->stats.frame.scr_sof = scr_sof; + + if (scr_sof < stream->stats.stream.min_sof) + stream->stats.stream.min_sof = scr_sof; + if (scr_sof > stream->stats.stream.max_sof) + stream->stats.stream.max_sof = scr_sof; + } + + /* Record the first non-empty packet number. */ + if (stream->stats.frame.size == 0 && len > header_size) + stream->stats.frame.first_data = stream->stats.frame.nb_packets; + + /* Update the frame size. */ + stream->stats.frame.size += len - header_size; + + /* Update the packets counters. */ + stream->stats.frame.nb_packets++; + if (len > header_size) + stream->stats.frame.nb_empty++; + + if (data[1] & UVC_STREAM_ERR) + stream->stats.frame.nb_errors++; +} + +static void uvc_video_stats_update(struct uvc_streaming *stream) +{ + struct uvc_stats_frame *frame = &stream->stats.frame; + + uvc_trace(UVC_TRACE_STATS, "frame %u stats: %u/%u/%u packets, " + "%u/%u/%u pts (%searly %sinitial), %u/%u scr, " + "last pts/stc/sof %u/%u/%u\n", + stream->sequence, frame->first_data, + frame->nb_packets - frame->nb_empty, frame->nb_packets, + frame->nb_pts_diffs, frame->last_pts_diff, frame->nb_pts, + frame->has_early_pts ? "" : "!", + frame->has_initial_pts ? "" : "!", + frame->nb_scr_diffs, frame->nb_scr, + frame->pts, frame->scr_stc, frame->scr_sof); + + stream->stats.stream.nb_frames++; + stream->stats.stream.nb_packets += stream->stats.frame.nb_packets; + stream->stats.stream.nb_empty += stream->stats.frame.nb_empty; + stream->stats.stream.nb_errors += stream->stats.frame.nb_errors; + stream->stats.stream.nb_invalid += stream->stats.frame.nb_invalid; + + if (frame->has_early_pts) + stream->stats.stream.nb_pts_early++; + if (frame->has_initial_pts) + stream->stats.stream.nb_pts_initial++; + if (frame->last_pts_diff <= frame->first_data) + stream->stats.stream.nb_pts_constant++; + if (frame->nb_scr >= frame->nb_packets - frame->nb_empty) + stream->stats.stream.nb_scr_count_ok++; + if (frame->nb_scr_diffs + 1 == frame->nb_scr) + stream->stats.stream.nb_scr_diffs_ok++; + + memset(&stream->stats.frame, 0, sizeof(stream->stats.frame)); +} + +size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf, + size_t size) +{ + unsigned int scr_sof_freq; + unsigned int duration; + struct timespec ts; + size_t count = 0; + + ts.tv_sec = stream->stats.stream.stop_ts.tv_sec + - stream->stats.stream.start_ts.tv_sec; + ts.tv_nsec = stream->stats.stream.stop_ts.tv_nsec + - stream->stats.stream.start_ts.tv_nsec; + if (ts.tv_nsec < 0) { + ts.tv_sec--; + ts.tv_nsec += 1000000000; + } + + /* Compute the SCR.SOF frequency estimate. At the nominal 1kHz SOF + * frequency this will not overflow before more than 1h. + */ + duration = ts.tv_sec * 1000 + ts.tv_nsec / 1000000; + if (duration != 0) + scr_sof_freq = stream->stats.stream.scr_sof_count * 1000 + / duration; + else + scr_sof_freq = 0; + + count += scnprintf(buf + count, size - count, + "frames: %u\npackets: %u\nempty: %u\n" + "errors: %u\ninvalid: %u\n", + stream->stats.stream.nb_frames, + stream->stats.stream.nb_packets, + stream->stats.stream.nb_empty, + stream->stats.stream.nb_errors, + stream->stats.stream.nb_invalid); + count += scnprintf(buf + count, size - count, + "pts: %u early, %u initial, %u ok\n", + stream->stats.stream.nb_pts_early, + stream->stats.stream.nb_pts_initial, + stream->stats.stream.nb_pts_constant); + count += scnprintf(buf + count, size - count, + "scr: %u count ok, %u diff ok\n", + stream->stats.stream.nb_scr_count_ok, + stream->stats.stream.nb_scr_diffs_ok); + count += scnprintf(buf + count, size - count, + "sof: %u <= sof <= %u, freq %u.%03u kHz\n", + stream->stats.stream.min_sof, + stream->stats.stream.max_sof, + scr_sof_freq / 1000, scr_sof_freq % 1000); + + return count; +} + +static void uvc_video_stats_start(struct uvc_streaming *stream) +{ + memset(&stream->stats, 0, sizeof(stream->stats)); + stream->stats.stream.min_sof = 2048; +} + +static void uvc_video_stats_stop(struct uvc_streaming *stream) +{ + ktime_get_ts(&stream->stats.stream.stop_ts); +} + +/* ------------------------------------------------------------------------ + * Video codecs + */ /* Video payload decoding is handled by uvc_video_decode_start(), * uvc_video_decode_data() and uvc_video_decode_end(). @@ -416,14 +944,9 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, * - 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) + if (len < 2 || data[0] < 2 || data[0] > len) { + stream->stats.frame.nb_invalid++; 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; @@ -431,8 +954,14 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, /* Increase the sequence number regardless of any buffer states, so * that discontinuous sequence numbers always indicate lost frames. */ - if (stream->last_fid != fid) + if (stream->last_fid != fid) { stream->sequence++; + if (stream->sequence) + uvc_video_stats_update(stream); + } + + uvc_video_clock_decode(stream, buf, data, len); + uvc_video_stats_decode(stream, data, len); /* Store the payload FID bit and return immediately when the buffer is * NULL. @@ -442,6 +971,13 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return -ENODATA; } + /* Mark the buffer as bad if the error bit is set. */ + if (data[1] & UVC_STREAM_ERR) { + uvc_trace(UVC_TRACE_FRAME, "Marking buffer as bad (error bit " + "set).\n"); + buf->error = 1; + } + /* 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. * stream->last_fid is initialized to -1, so the first isochronous @@ -467,9 +1003,10 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, else ktime_get_real_ts(&ts); - buf->buf.sequence = stream->sequence; - buf->buf.timestamp.tv_sec = ts.tv_sec; - buf->buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; + buf->buf.v4l2_buf.sequence = stream->sequence; + buf->buf.v4l2_buf.timestamp.tv_sec = ts.tv_sec; + buf->buf.v4l2_buf.timestamp.tv_usec = + ts.tv_nsec / NSEC_PER_USEC; /* TODO: Handle PTS and SCR. */ buf->state = UVC_BUF_STATE_ACTIVE; @@ -490,7 +1027,7 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, * avoids detecting end of frame conditions at FID toggling if the * previous payload had the EOF bit set. */ - if (fid != stream->last_fid && buf->buf.bytesused != 0) { + if (fid != stream->last_fid && buf->bytesused != 0) { uvc_trace(UVC_TRACE_FRAME, "Frame complete (FID bit " "toggled).\n"); buf->state = UVC_BUF_STATE_READY; @@ -505,7 +1042,6 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, static void uvc_video_decode_data(struct uvc_streaming *stream, struct uvc_buffer *buf, const __u8 *data, int len) { - struct uvc_video_queue *queue = &stream->queue; unsigned int maxlen, nbytes; void *mem; @@ -513,11 +1049,11 @@ static void uvc_video_decode_data(struct uvc_streaming *stream, 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; + maxlen = buf->length - buf->bytesused; + mem = buf->mem + buf->bytesused; nbytes = min((unsigned int)len, maxlen); memcpy(mem, data, nbytes); - buf->buf.bytesused += nbytes; + buf->bytesused += nbytes; /* Complete the current frame if the buffer size was exceeded. */ if (len > maxlen) { @@ -530,7 +1066,7 @@ 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. */ - if (data[1] & UVC_STREAM_EOF && buf->buf.bytesused != 0) { + if (data[1] & UVC_STREAM_EOF && 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"); @@ -568,8 +1104,8 @@ static int uvc_video_encode_data(struct uvc_streaming *stream, 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); + mem = buf->mem + queue->buf_used; + nbytes = min((unsigned int)len, buf->bytesused - queue->buf_used); nbytes = min(stream->bulk.max_payload_size - stream->bulk.payload_size, nbytes); memcpy(data, mem, nbytes); @@ -624,7 +1160,7 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream, urb->iso_frame_desc[i].actual_length); if (buf->state == UVC_BUF_STATE_READY) { - if (buf->buf.length != buf->buf.bytesused && + if (buf->length != buf->bytesused && !(stream->cur_format->flags & UVC_FMT_FLAG_COMPRESSED)) buf->error = 1; @@ -724,12 +1260,12 @@ static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream, stream->bulk.payload_size += ret; len -= ret; - if (buf->buf.bytesused == stream->queue.buf_used || + if (buf->bytesused == stream->queue.buf_used || stream->bulk.payload_size == stream->bulk.max_payload_size) { - if (buf->buf.bytesused == stream->queue.buf_used) { + if (buf->bytesused == stream->queue.buf_used) { stream->queue.buf_used = 0; buf->state = UVC_BUF_STATE_READY; - buf->buf.sequence = ++stream->sequence; + buf->buf.v4l2_buf.sequence = ++stream->sequence; uvc_queue_next_buffer(&stream->queue, buf); stream->last_fid ^= UVC_STREAM_FID; } @@ -870,6 +1406,8 @@ static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) struct urb *urb; unsigned int i; + uvc_video_stats_stop(stream); + for (i = 0; i < UVC_URBS; ++i) { urb = stream->urb[i]; if (urb == NULL) @@ -882,6 +1420,8 @@ static void uvc_uninit_video(struct uvc_streaming *stream, int free_buffers) if (free_buffers) uvc_free_urb_buffers(stream); + + uvc_video_clock_cleanup(stream); } /* @@ -1009,6 +1549,12 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags) stream->bulk.skip_payload = 0; stream->bulk.payload_size = 0; + uvc_video_stats_start(stream); + + ret = uvc_video_clock_init(stream); + if (ret < 0) + return ret; + if (intf->num_altsetting > 1) { struct usb_host_endpoint *best_ep = NULL; unsigned int best_psize = 3 * 1024; @@ -1283,6 +1829,11 @@ int uvc_video_enable(struct uvc_streaming *stream, int enable) return ret; } - return uvc_init_video(stream, GFP_KERNEL); -} + ret = uvc_init_video(stream, GFP_KERNEL); + if (ret < 0) { + usb_set_interface(stream->dev->udev, stream->intfnum, 0); + uvc_queue_enable(&stream->queue, 0); + } + return ret; +} diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index 4c1392e..67f88d8 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -13,6 +13,7 @@ #include <linux/videodev2.h> #include <media/media-device.h> #include <media/v4l2-device.h> +#include <media/videobuf2-core.h> /* -------------------------------------------------------------------------- * UVC constants @@ -113,6 +114,7 @@ /* Maximum allowed number of control mappings per device */ #define UVC_MAX_CONTROL_MAPPINGS 1024 +#define UVC_MAX_CONTROL_MENU_ENTRIES 32 /* Devices quirks */ #define UVC_QUIRK_STATUS_INTERVAL 0x00000001 @@ -319,35 +321,30 @@ enum uvc_buffer_state { }; struct uvc_buffer { - unsigned long vma_use_count; - struct list_head stream; - - /* Touched by interrupt handler. */ - struct v4l2_buffer buf; + struct vb2_buffer buf; struct list_head queue; - wait_queue_head_t wait; + enum uvc_buffer_state state; unsigned int error; + + void *mem; + unsigned int length; + unsigned int bytesused; + + u32 pts; }; -#define UVC_QUEUE_STREAMING (1 << 0) -#define UVC_QUEUE_DISCONNECTED (1 << 1) -#define UVC_QUEUE_DROP_CORRUPTED (1 << 2) +#define UVC_QUEUE_DISCONNECTED (1 << 0) +#define UVC_QUEUE_DROP_CORRUPTED (1 << 1) struct uvc_video_queue { - enum v4l2_buf_type type; + struct vb2_queue queue; + struct mutex mutex; /* Protects queue */ - void *mem; unsigned int flags; - - unsigned int count; - unsigned int buf_size; unsigned int buf_used; - struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS]; - struct mutex mutex; /* protects buffers and mainqueue */ - spinlock_t irqlock; /* protects irqqueue */ - struct list_head mainqueue; + spinlock_t irqlock; /* Protects irqqueue */ struct list_head irqqueue; }; @@ -362,6 +359,51 @@ struct uvc_video_chain { struct mutex ctrl_mutex; /* Protects ctrl.info */ }; +struct uvc_stats_frame { + unsigned int size; /* Number of bytes captured */ + unsigned int first_data; /* Index of the first non-empty packet */ + + unsigned int nb_packets; /* Number of packets */ + unsigned int nb_empty; /* Number of empty packets */ + unsigned int nb_invalid; /* Number of packets with an invalid header */ + unsigned int nb_errors; /* Number of packets with the error bit set */ + + unsigned int nb_pts; /* Number of packets with a PTS timestamp */ + unsigned int nb_pts_diffs; /* Number of PTS differences inside a frame */ + unsigned int last_pts_diff; /* Index of the last PTS difference */ + bool has_initial_pts; /* Whether the first non-empty packet has a PTS */ + bool has_early_pts; /* Whether a PTS is present before the first non-empty packet */ + u32 pts; /* PTS of the last packet */ + + unsigned int nb_scr; /* Number of packets with a SCR timestamp */ + unsigned int nb_scr_diffs; /* Number of SCR.STC differences inside a frame */ + u16 scr_sof; /* SCR.SOF of the last packet */ + u32 scr_stc; /* SCR.STC of the last packet */ +}; + +struct uvc_stats_stream { + struct timespec start_ts; /* Stream start timestamp */ + struct timespec stop_ts; /* Stream stop timestamp */ + + unsigned int nb_frames; /* Number of frames */ + + unsigned int nb_packets; /* Number of packets */ + unsigned int nb_empty; /* Number of empty packets */ + unsigned int nb_invalid; /* Number of packets with an invalid header */ + unsigned int nb_errors; /* Number of packets with the error bit set */ + + unsigned int nb_pts_constant; /* Number of frames with constant PTS */ + unsigned int nb_pts_early; /* Number of frames with early PTS */ + unsigned int nb_pts_initial; /* Number of frames with initial PTS */ + + unsigned int nb_scr_count_ok; /* Number of frames with at least one SCR per non empty packet */ + unsigned int nb_scr_diffs_ok; /* Number of frames with varying SCR.STC */ + unsigned int scr_sof_count; /* STC.SOF counter accumulated since stream start */ + unsigned int scr_sof; /* STC.SOF of the last packet */ + unsigned int min_sof; /* Minimum STC.SOF value */ + unsigned int max_sof; /* Maximum STC.SOF value */ +}; + struct uvc_streaming { struct list_head list; struct uvc_device *dev; @@ -387,6 +429,7 @@ struct uvc_streaming { */ struct mutex mutex; + /* Buffers queue. */ unsigned int frozen : 1; struct uvc_video_queue queue; void (*decode) (struct urb *urb, struct uvc_streaming *video, @@ -408,6 +451,32 @@ struct uvc_streaming { __u32 sequence; __u8 last_fid; + + /* debugfs */ + struct dentry *debugfs_dir; + struct { + struct uvc_stats_frame frame; + struct uvc_stats_stream stream; + } stats; + + /* Timestamps support. */ + struct uvc_clock { + struct uvc_clock_sample { + u32 dev_stc; + u16 dev_sof; + struct timespec host_ts; + u16 host_sof; + } *samples; + + unsigned int head; + unsigned int count; + unsigned int size; + + u16 last_sof; + u16 sof_offset; + + spinlock_t lock; + } clock; }; enum uvc_device_state { @@ -479,9 +548,12 @@ struct uvc_driver { #define UVC_TRACE_SUSPEND (1 << 8) #define UVC_TRACE_STATUS (1 << 9) #define UVC_TRACE_VIDEO (1 << 10) +#define UVC_TRACE_STATS (1 << 11) +#define UVC_TRACE_CLOCK (1 << 12) #define UVC_WARN_MINMAX 0 #define UVC_WARN_PROBE_DEF 1 +#define UVC_WARN_XU_GET_RES 2 extern unsigned int uvc_clock_param; extern unsigned int uvc_no_drop_param; @@ -516,8 +588,8 @@ extern struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id); extern void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, int drop_corrupted); extern int uvc_alloc_buffers(struct uvc_video_queue *queue, - unsigned int nbuffers, unsigned int buflength); -extern int uvc_free_buffers(struct uvc_video_queue *queue); + struct v4l2_requestbuffers *rb); +extern void uvc_free_buffers(struct uvc_video_queue *queue); extern int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *v4l2_buf); extern int uvc_queue_buffer(struct uvc_video_queue *queue, @@ -539,7 +611,7 @@ extern unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue, extern int uvc_queue_allocated(struct uvc_video_queue *queue); static inline int uvc_queue_streaming(struct uvc_video_queue *queue) { - return queue->flags & UVC_QUEUE_STREAMING; + return vb2_is_streaming(&queue->queue); } /* V4L2 interface */ @@ -556,10 +628,11 @@ extern int uvc_video_resume(struct uvc_streaming *stream, int reset); extern int uvc_video_enable(struct uvc_streaming *stream, int enable); extern int uvc_probe_video(struct uvc_streaming *stream, struct uvc_streaming_control *probe); -extern int uvc_commit_video(struct uvc_streaming *stream, - struct uvc_streaming_control *ctrl); extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, __u8 intfnum, __u8 cs, void *data, __u16 size); +void uvc_video_clock_update(struct uvc_streaming *stream, + struct v4l2_buffer *v4l2_buf, + struct uvc_buffer *buf); /* Status */ extern int uvc_status_init(struct uvc_device *dev); @@ -612,4 +685,13 @@ extern struct usb_host_endpoint *uvc_find_endpoint( void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream, struct uvc_buffer *buf); +/* debugfs and statistics */ +int uvc_debugfs_init(void); +void uvc_debugfs_cleanup(void); +int uvc_debugfs_init_stream(struct uvc_streaming *stream); +void uvc_debugfs_cleanup_stream(struct uvc_streaming *stream); + +size_t uvc_video_stats_dump(struct uvc_streaming *stream, char *buf, + size_t size); + #endif |
