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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id o26sm4336403edt.62.2021.06.18.05.29.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jun 2021 05:29:38 -0700 (PDT) From: Ricardo Ribalda To: Laurent Pinchart , Hans Verkuil , Mauro Carvalho Chehab , Sergey Senozhatsky , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, tfiga@chromium.org Cc: Hans Verkuil Subject: [PATCH v10 20/21] uvc: use vb2 ioctl and fop helpers Date: Fri, 18 Jun 2021 14:29:22 +0200 Message-Id: <20210618122923.385938-21-ribalda@chromium.org> X-Mailer: git-send-email 2.32.0.288.g62a8d224e6-goog In-Reply-To: <20210618122923.385938-1-ribalda@chromium.org> References: <20210618122923.385938-1-ribalda@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -1.5 (-) X-LSpam-Report: No, score=-1.5 required=5.0 tests=BAYES_00=-1.9,DKIMWL_WL_HIGH=0.001,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1,RCVD_IN_DNSWL_LOW=-0.7,URIBL_BLACK=1.7 autolearn=no autolearn_force=no From: Hans Verkuil When uvc was written the vb2 ioctl and file operation helpers didn't exist. This patch switches uvc over to those helpers, which removes a lot of boilerplate code and simplifies VIDIOC_G/S_PRIORITY handling and allows us to drop the 'privileges' scheme, since that's now handled inside the vb2 helpers. This makes it possible for uvc to pass the v4l2-compliance streaming tests. Signed-off-by: Hans Verkuil --- drivers/media/usb/uvc/uvc_driver.c | 7 +- drivers/media/usb/uvc/uvc_metadata.c | 8 +- drivers/media/usb/uvc/uvc_queue.c | 143 ------------- drivers/media/usb/uvc/uvc_v4l2.c | 288 ++------------------------- drivers/media/usb/uvc/uvcvideo.h | 32 --- 5 files changed, 25 insertions(+), 453 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 037bf80d1100..9416e80fe392 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1943,7 +1943,6 @@ static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev) INIT_LIST_HEAD(&chain->entities); mutex_init(&chain->ctrl_mutex); chain->dev = dev; - v4l2_prio_init(&chain->prio); return chain; } @@ -2213,7 +2212,7 @@ int uvc_register_video_device(struct uvc_device *dev, vdev->fops = fops; vdev->ioctl_ops = ioctl_ops; vdev->release = uvc_release; - vdev->prio = &stream->chain->prio; + vdev->queue = &queue->queue; if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT) vdev->vfl_dir = VFL_DIR_TX; else @@ -2578,8 +2577,8 @@ static int __uvc_resume(struct usb_interface *intf, int reset) if (stream->intf == intf) { ret = uvc_video_resume(stream, reset); if (ret < 0) - uvc_queue_streamoff(&stream->queue, - stream->queue.queue.type); + vb2_streamoff(&stream->queue.queue, + stream->queue.queue.type); return ret; } } diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c index 82de7781f5b6..d3aab22f91ce 100644 --- a/drivers/media/usb/uvc/uvc_metadata.c +++ b/drivers/media/usb/uvc/uvc_metadata.c @@ -96,7 +96,7 @@ static int uvc_meta_v4l2_set_format(struct file *file, void *fh, */ mutex_lock(&stream->mutex); - if (uvc_queue_allocated(&stream->queue)) + if (vb2_is_busy(&stream->meta.queue.queue)) ret = -EBUSY; else stream->meta.format = fmt->dataformat; @@ -164,12 +164,6 @@ int uvc_meta_register(struct uvc_streaming *stream) stream->meta.format = V4L2_META_FMT_UVC; - /* - * The video interface queue uses manual locking and thus does not set - * the queue pointer. Set it manually here. - */ - vdev->queue = &queue->queue; - return uvc_register_video_device(dev, stream, vdev, queue, V4L2_BUF_TYPE_META_CAPTURE, &uvc_meta_fops, &uvc_meta_ioctl_ops); diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c index 21a907d32bb7..437e48b32480 100644 --- a/drivers/media/usb/uvc/uvc_queue.c +++ b/drivers/media/usb/uvc/uvc_queue.c @@ -247,153 +247,10 @@ int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, return 0; } -void uvc_queue_release(struct uvc_video_queue *queue) -{ - mutex_lock(&queue->mutex); - vb2_queue_release(&queue->queue); - mutex_unlock(&queue->mutex); -} - -/* ----------------------------------------------------------------------------- - * V4L2 queue operations - */ - -int uvc_request_buffers(struct uvc_video_queue *queue, - struct v4l2_requestbuffers *rb) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_reqbufs(&queue->queue, rb); - mutex_unlock(&queue->mutex); - - return ret ? ret : rb->count; -} - -int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_querybuf(&queue->queue, buf); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_create_buffers(struct uvc_video_queue *queue, - struct v4l2_create_buffers *cb) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_create_bufs(&queue->queue, cb); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_queue_buffer(struct uvc_video_queue *queue, - struct media_device *mdev, struct v4l2_buffer *buf) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_qbuf(&queue->queue, mdev, buf); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_export_buffer(struct uvc_video_queue *queue, - struct v4l2_exportbuffer *exp) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_expbuf(&queue->queue, exp); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf, - int nonblocking) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_dqbuf(&queue->queue, buf, nonblocking); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_streamon(&queue->queue, type); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type) -{ - int ret; - - mutex_lock(&queue->mutex); - ret = vb2_streamoff(&queue->queue, type); - mutex_unlock(&queue->mutex); - - return ret; -} - -int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma) -{ - return vb2_mmap(&queue->queue, vma); -} - -#ifndef CONFIG_MMU -unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue, - unsigned long pgoff) -{ - return vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0); -} -#endif - -__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, - poll_table *wait) -{ - __poll_t ret; - - mutex_lock(&queue->mutex); - ret = vb2_poll(&queue->queue, file, wait); - mutex_unlock(&queue->mutex); - - return ret; -} - /* ----------------------------------------------------------------------------- * */ -/* - * Check if buffers have been allocated. - */ -int uvc_queue_allocated(struct uvc_video_queue *queue) -{ - int allocated; - - mutex_lock(&queue->mutex); - allocated = vb2_is_busy(&queue->queue); - mutex_unlock(&queue->mutex); - - return allocated; -} - /* * Cancel the video buffers queue. * diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 0f4d893eff46..e40db7ae18b1 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -352,17 +352,13 @@ static int uvc_v4l2_set_format(struct uvc_streaming *stream, return ret; mutex_lock(&stream->mutex); - - if (uvc_queue_allocated(&stream->queue)) { + if (vb2_is_busy(&stream->queue.queue)) { ret = -EBUSY; - goto done; + } else { + stream->ctrl = probe; + stream->cur_format = format; + stream->cur_frame = frame; } - - stream->ctrl = probe; - stream->cur_format = format; - stream->cur_frame = frame; - -done: mutex_unlock(&stream->mutex); return ret; } @@ -489,62 +485,6 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream, return 0; } -/* ------------------------------------------------------------------------ - * Privilege management - */ - -/* - * Privilege management is the multiple-open implementation basis. The current - * implementation is completely transparent for the end-user and doesn't - * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls. - * Those ioctls enable finer control on the device (by making possible for a - * user to request exclusive access to a device), but are not mature yet. - * Switching to the V4L2 priority mechanism might be considered in the future - * if this situation changes. - * - * Each open instance of a UVC device can either be in a privileged or - * unprivileged state. Only a single instance can be in a privileged state at - * a given time. Trying to perform an operation that requires privileges will - * automatically acquire the required privileges if possible, or return -EBUSY - * otherwise. Privileges are dismissed when closing the instance or when - * freeing the video buffers using VIDIOC_REQBUFS. - * - * Operations that require privileges are: - * - * - VIDIOC_S_INPUT - * - VIDIOC_S_PARM - * - VIDIOC_S_FMT - * - VIDIOC_REQBUFS - */ -static int uvc_acquire_privileges(struct uvc_fh *handle) -{ - /* Always succeed if the handle is already privileged. */ - if (handle->state == UVC_HANDLE_ACTIVE) - return 0; - - /* Check if the device already has a privileged handle. */ - if (atomic_inc_return(&handle->stream->active) != 1) { - atomic_dec(&handle->stream->active); - return -EBUSY; - } - - handle->state = UVC_HANDLE_ACTIVE; - return 0; -} - -static void uvc_dismiss_privileges(struct uvc_fh *handle) -{ - if (handle->state == UVC_HANDLE_ACTIVE) - atomic_dec(&handle->stream->active); - - handle->state = UVC_HANDLE_PASSIVE; -} - -static int uvc_has_privileges(struct uvc_fh *handle) -{ - return handle->state == UVC_HANDLE_ACTIVE; -} - /* ------------------------------------------------------------------------ * V4L2 file operations */ @@ -587,7 +527,6 @@ static int uvc_v4l2_open(struct file *file) v4l2_fh_add(&handle->vfh); handle->chain = stream->chain; handle->stream = stream; - handle->state = UVC_HANDLE_PASSIVE; file->private_data = handle; return 0; @@ -600,15 +539,8 @@ static int uvc_v4l2_release(struct file *file) uvc_dbg(stream->dev, CALLS, "%s\n", __func__); - /* Only free resources if this is a privileged handle. */ - if (uvc_has_privileges(handle)) - uvc_queue_release(&stream->queue); - /* Release the file handle. */ - uvc_dismiss_privileges(handle); - v4l2_fh_del(&handle->vfh); - v4l2_fh_exit(&handle->vfh); - kfree(handle); + vb2_fop_release(file); file->private_data = NULL; mutex_lock(&stream->dev->lock); @@ -701,11 +633,6 @@ static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_streaming *stream = handle->stream; - int ret; - - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; return uvc_v4l2_set_format(stream, fmt); } @@ -715,11 +642,6 @@ static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_streaming *stream = handle->stream; - int ret; - - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; return uvc_v4l2_set_format(stream, fmt); } @@ -744,124 +666,6 @@ static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh, return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL); } -static int uvc_ioctl_reqbufs(struct file *file, void *fh, - struct v4l2_requestbuffers *rb) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - int ret; - - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; - - mutex_lock(&stream->mutex); - ret = uvc_request_buffers(&stream->queue, rb); - mutex_unlock(&stream->mutex); - if (ret < 0) - return ret; - - if (ret == 0) - uvc_dismiss_privileges(handle); - - return 0; -} - -static int uvc_ioctl_querybuf(struct file *file, void *fh, - struct v4l2_buffer *buf) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - return uvc_query_buffer(&stream->queue, buf); -} - -static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - return uvc_queue_buffer(&stream->queue, - stream->vdev.v4l2_dev->mdev, buf); -} - -static int uvc_ioctl_expbuf(struct file *file, void *fh, - struct v4l2_exportbuffer *exp) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - return uvc_export_buffer(&stream->queue, exp); -} - -static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - return uvc_dequeue_buffer(&stream->queue, buf, - file->f_flags & O_NONBLOCK); -} - -static int uvc_ioctl_create_bufs(struct file *file, void *fh, - struct v4l2_create_buffers *cb) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - int ret; - - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; - - return uvc_create_buffers(&stream->queue, cb); -} - -static int uvc_ioctl_streamon(struct file *file, void *fh, - enum v4l2_buf_type type) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - int ret; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - mutex_lock(&stream->mutex); - ret = uvc_queue_streamon(&stream->queue, type); - mutex_unlock(&stream->mutex); - - return ret; -} - -static int uvc_ioctl_streamoff(struct file *file, void *fh, - enum v4l2_buf_type type) -{ - struct uvc_fh *handle = fh; - struct uvc_streaming *stream = handle->stream; - - if (!uvc_has_privileges(handle)) - return -EBUSY; - - mutex_lock(&stream->mutex); - uvc_queue_streamoff(&stream->queue, type); - mutex_unlock(&stream->mutex); - - return 0; -} - static int uvc_ioctl_enum_input(struct file *file, void *fh, struct v4l2_input *input) { @@ -929,13 +733,12 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input) static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input) { struct uvc_fh *handle = fh; + struct uvc_streaming *stream = handle->stream; struct uvc_video_chain *chain = handle->chain; - int ret; u32 i; - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; + if (vb2_is_busy(&stream->queue.queue)) + return -EBUSY; if (chain->selector == NULL || (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) { @@ -1166,11 +969,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh, { struct uvc_fh *handle = fh; struct uvc_streaming *stream = handle->stream; - int ret; - - ret = uvc_acquire_privileges(handle); - if (ret < 0) - return ret; return uvc_v4l2_set_streamparm(stream, parm); } @@ -1438,50 +1236,6 @@ static long uvc_v4l2_compat_ioctl32(struct file *file, } #endif -static ssize_t uvc_v4l2_read(struct file *file, char __user *data, - size_t count, loff_t *ppos) -{ - struct uvc_fh *handle = file->private_data; - struct uvc_streaming *stream = handle->stream; - - uvc_dbg(stream->dev, CALLS, "%s: not implemented\n", __func__); - return -EINVAL; -} - -static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct uvc_fh *handle = file->private_data; - struct uvc_streaming *stream = handle->stream; - - uvc_dbg(stream->dev, CALLS, "%s\n", __func__); - - return uvc_queue_mmap(&stream->queue, vma); -} - -static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait) -{ - struct uvc_fh *handle = file->private_data; - struct uvc_streaming *stream = handle->stream; - - uvc_dbg(stream->dev, CALLS, "%s\n", __func__); - - return uvc_queue_poll(&stream->queue, file, wait); -} - -#ifndef CONFIG_MMU -static unsigned long uvc_v4l2_get_unmapped_area(struct file *file, - unsigned long addr, unsigned long len, unsigned long pgoff, - unsigned long flags) -{ - struct uvc_fh *handle = file->private_data; - struct uvc_streaming *stream = handle->stream; - - uvc_dbg(stream->dev, CALLS, "%s\n", __func__); - - return uvc_queue_get_unmapped_area(&stream->queue, pgoff); -} -#endif - const struct v4l2_ioctl_ops uvc_ioctl_ops = { .vidioc_querycap = uvc_ioctl_querycap, .vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap, @@ -1492,14 +1246,15 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = { .vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out, .vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap, .vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out, - .vidioc_reqbufs = uvc_ioctl_reqbufs, - .vidioc_querybuf = uvc_ioctl_querybuf, - .vidioc_qbuf = uvc_ioctl_qbuf, - .vidioc_expbuf = uvc_ioctl_expbuf, - .vidioc_dqbuf = uvc_ioctl_dqbuf, - .vidioc_create_bufs = uvc_ioctl_create_bufs, - .vidioc_streamon = uvc_ioctl_streamon, - .vidioc_streamoff = uvc_ioctl_streamoff, + .vidioc_reqbufs = vb2_ioctl_reqbufs, + .vidioc_querybuf = vb2_ioctl_querybuf, + .vidioc_prepare_buf = vb2_ioctl_prepare_buf, + .vidioc_qbuf = vb2_ioctl_qbuf, + .vidioc_expbuf = vb2_ioctl_expbuf, + .vidioc_dqbuf = vb2_ioctl_dqbuf, + .vidioc_create_bufs = vb2_ioctl_create_bufs, + .vidioc_streamon = vb2_ioctl_streamon, + .vidioc_streamoff = vb2_ioctl_streamoff, .vidioc_enum_input = uvc_ioctl_enum_input, .vidioc_g_input = uvc_ioctl_g_input, .vidioc_s_input = uvc_ioctl_s_input, @@ -1527,11 +1282,10 @@ const struct v4l2_file_operations uvc_fops = { #ifdef CONFIG_COMPAT .compat_ioctl32 = uvc_v4l2_compat_ioctl32, #endif - .read = uvc_v4l2_read, - .mmap = uvc_v4l2_mmap, - .poll = uvc_v4l2_poll, + .mmap = vb2_fop_mmap, + .poll = vb2_fop_poll, #ifndef CONFIG_MMU - .get_unmapped_area = uvc_v4l2_get_unmapped_area, + .get_unmapped_area = vb2_fop_get_unmapped_area, #endif }; diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index fd4f5ef47dfb..a087d66d2105 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -474,7 +474,6 @@ struct uvc_video_chain { struct mutex ctrl_mutex; /* Protects ctrl.info */ - struct v4l2_prio_state prio; /* V4L2 priority state */ u32 caps; /* V4L2 chain-wide caps */ u8 ctrl_class_bitmap; /* Bitmap of valid classes */ }; @@ -713,16 +712,10 @@ struct uvc_device { struct uvc_entity *gpio_unit; }; -enum uvc_handle_state { - UVC_HANDLE_PASSIVE = 0, - UVC_HANDLE_ACTIVE = 1, -}; - struct uvc_fh { struct v4l2_fh vfh; struct uvc_video_chain *chain; struct uvc_streaming *stream; - enum uvc_handle_state state; }; struct uvc_driver { @@ -787,36 +780,11 @@ struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id); /* Video buffers queue management. */ int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, int drop_corrupted); -void uvc_queue_release(struct uvc_video_queue *queue); -int uvc_request_buffers(struct uvc_video_queue *queue, - struct v4l2_requestbuffers *rb); -int uvc_query_buffer(struct uvc_video_queue *queue, - struct v4l2_buffer *v4l2_buf); -int uvc_create_buffers(struct uvc_video_queue *queue, - struct v4l2_create_buffers *v4l2_cb); -int uvc_queue_buffer(struct uvc_video_queue *queue, - struct media_device *mdev, - struct v4l2_buffer *v4l2_buf); -int uvc_export_buffer(struct uvc_video_queue *queue, - struct v4l2_exportbuffer *exp); -int uvc_dequeue_buffer(struct uvc_video_queue *queue, - struct v4l2_buffer *v4l2_buf, int nonblocking); -int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type); -int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type); void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect); struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue, struct uvc_buffer *buf); struct uvc_buffer *uvc_queue_get_current_buffer(struct uvc_video_queue *queue); void uvc_queue_buffer_release(struct uvc_buffer *buf); -int uvc_queue_mmap(struct uvc_video_queue *queue, - struct vm_area_struct *vma); -__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, - poll_table *wait); -#ifndef CONFIG_MMU -unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue, - unsigned long pgoff); -#endif -int uvc_queue_allocated(struct uvc_video_queue *queue); static inline int uvc_queue_streaming(struct uvc_video_queue *queue) { return vb2_is_streaming(&queue->queue);