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348 lines
9.3 KiB
348 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* uvc_queue.c -- USB Video Class driver - Buffers management |
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* |
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* Copyright (C) 2005-2010 |
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* Laurent Pinchart ([email protected]) |
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*/ |
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#include <linux/atomic.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/list.h> |
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#include <linux/module.h> |
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#include <linux/usb.h> |
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#include <linux/videodev2.h> |
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#include <linux/vmalloc.h> |
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#include <linux/wait.h> |
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#include <media/v4l2-common.h> |
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#include <media/videobuf2-vmalloc.h> |
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#include "uvc.h" |
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/* ------------------------------------------------------------------------ |
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* Video buffers queue management. |
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* |
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* Video queues is initialized by uvcg_queue_init(). The function performs |
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* basic initialization of the uvc_video_queue struct and never fails. |
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* |
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* Video buffers are managed by videobuf2. The driver uses a mutex to protect |
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* the videobuf2 queue operations by serializing calls to videobuf2 and a |
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* spinlock to protect the IRQ queue that holds the buffers to be processed by |
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* the driver. |
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*/ |
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/* ----------------------------------------------------------------------------- |
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* videobuf2 queue operations |
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*/ |
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static int uvc_queue_setup(struct vb2_queue *vq, |
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unsigned int *nbuffers, unsigned int *nplanes, |
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unsigned int sizes[], struct device *alloc_devs[]) |
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{ |
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struct uvc_video_queue *queue = vb2_get_drv_priv(vq); |
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struct uvc_video *video = container_of(queue, struct uvc_video, queue); |
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if (*nbuffers > UVC_MAX_VIDEO_BUFFERS) |
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*nbuffers = UVC_MAX_VIDEO_BUFFERS; |
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*nplanes = 1; |
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sizes[0] = video->imagesize; |
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return 0; |
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} |
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static int uvc_buffer_prepare(struct vb2_buffer *vb) |
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{ |
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struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue); |
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
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struct uvc_buffer *buf = container_of(vbuf, struct uvc_buffer, buf); |
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if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT && |
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vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) { |
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uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n"); |
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return -EINVAL; |
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} |
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if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED)) |
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return -ENODEV; |
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buf->state = UVC_BUF_STATE_QUEUED; |
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buf->mem = vb2_plane_vaddr(vb, 0); |
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buf->length = vb2_plane_size(vb, 0); |
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if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) |
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buf->bytesused = 0; |
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else |
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buf->bytesused = vb2_get_plane_payload(vb, 0); |
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return 0; |
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} |
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static void uvc_buffer_queue(struct vb2_buffer *vb) |
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{ |
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struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue); |
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
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struct uvc_buffer *buf = container_of(vbuf, struct uvc_buffer, buf); |
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unsigned long flags; |
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spin_lock_irqsave(&queue->irqlock, flags); |
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if (likely(!(queue->flags & UVC_QUEUE_DISCONNECTED))) { |
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list_add_tail(&buf->queue, &queue->irqqueue); |
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} else { |
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/* If the device is disconnected return the buffer to userspace |
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* directly. The next QBUF call will fail with -ENODEV. |
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*/ |
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buf->state = UVC_BUF_STATE_ERROR; |
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vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); |
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} |
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spin_unlock_irqrestore(&queue->irqlock, flags); |
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} |
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static const struct vb2_ops uvc_queue_qops = { |
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.queue_setup = uvc_queue_setup, |
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.buf_prepare = uvc_buffer_prepare, |
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.buf_queue = uvc_buffer_queue, |
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.wait_prepare = vb2_ops_wait_prepare, |
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.wait_finish = vb2_ops_wait_finish, |
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}; |
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int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type, |
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struct mutex *lock) |
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{ |
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int ret; |
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queue->queue.type = type; |
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queue->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; |
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queue->queue.drv_priv = queue; |
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queue->queue.buf_struct_size = sizeof(struct uvc_buffer); |
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queue->queue.ops = &uvc_queue_qops; |
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queue->queue.lock = lock; |
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queue->queue.mem_ops = &vb2_vmalloc_memops; |
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queue->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC |
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| V4L2_BUF_FLAG_TSTAMP_SRC_EOF; |
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ret = vb2_queue_init(&queue->queue); |
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if (ret) |
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return ret; |
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spin_lock_init(&queue->irqlock); |
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INIT_LIST_HEAD(&queue->irqqueue); |
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queue->flags = 0; |
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return 0; |
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} |
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/* |
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* Free the video buffers. |
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*/ |
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void uvcg_free_buffers(struct uvc_video_queue *queue) |
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{ |
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vb2_queue_release(&queue->queue); |
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} |
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/* |
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* Allocate the video buffers. |
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*/ |
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int uvcg_alloc_buffers(struct uvc_video_queue *queue, |
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struct v4l2_requestbuffers *rb) |
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{ |
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int ret; |
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ret = vb2_reqbufs(&queue->queue, rb); |
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return ret ? ret : rb->count; |
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} |
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int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf) |
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{ |
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return vb2_querybuf(&queue->queue, buf); |
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} |
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int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf) |
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{ |
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unsigned long flags; |
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int ret; |
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ret = vb2_qbuf(&queue->queue, NULL, buf); |
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if (ret < 0) |
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return ret; |
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spin_lock_irqsave(&queue->irqlock, flags); |
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ret = (queue->flags & UVC_QUEUE_PAUSED) != 0; |
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queue->flags &= ~UVC_QUEUE_PAUSED; |
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spin_unlock_irqrestore(&queue->irqlock, flags); |
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return ret; |
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} |
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/* |
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* Dequeue a video buffer. If nonblocking is false, block until a buffer is |
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* available. |
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*/ |
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int uvcg_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf, |
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int nonblocking) |
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{ |
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return vb2_dqbuf(&queue->queue, buf, nonblocking); |
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} |
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/* |
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* Poll the video queue. |
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* |
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* This function implements video queue polling and is intended to be used by |
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* the device poll handler. |
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*/ |
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__poll_t uvcg_queue_poll(struct uvc_video_queue *queue, struct file *file, |
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poll_table *wait) |
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{ |
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return vb2_poll(&queue->queue, file, wait); |
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} |
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int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma) |
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{ |
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return vb2_mmap(&queue->queue, vma); |
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} |
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#ifndef CONFIG_MMU |
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/* |
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* Get unmapped area. |
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* |
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* NO-MMU arch need this function to make mmap() work correctly. |
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*/ |
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unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue, |
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unsigned long pgoff) |
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{ |
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return vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0); |
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} |
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#endif |
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/* |
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* Cancel the video buffers queue. |
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* |
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* Cancelling the queue marks all buffers on the irq queue as erroneous, |
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* wakes them up and removes them from the queue. |
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* |
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* If the disconnect parameter is set, further calls to uvc_queue_buffer will |
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* fail with -ENODEV. |
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* |
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* This function acquires the irq spinlock and can be called from interrupt |
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* context. |
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*/ |
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void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect) |
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{ |
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struct uvc_buffer *buf; |
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unsigned long flags; |
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spin_lock_irqsave(&queue->irqlock, flags); |
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while (!list_empty(&queue->irqqueue)) { |
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buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, |
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queue); |
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list_del(&buf->queue); |
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buf->state = UVC_BUF_STATE_ERROR; |
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vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); |
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} |
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/* This must be protected by the irqlock spinlock to avoid race |
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* conditions between uvc_queue_buffer and the disconnection event that |
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* could result in an interruptible wait in uvc_dequeue_buffer. Do not |
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* blindly replace this logic by checking for the UVC_DEV_DISCONNECTED |
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* state outside the queue code. |
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*/ |
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if (disconnect) |
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queue->flags |= UVC_QUEUE_DISCONNECTED; |
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spin_unlock_irqrestore(&queue->irqlock, flags); |
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} |
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/* |
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* Enable or disable the video buffers queue. |
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* |
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* The queue must be enabled before starting video acquisition and must be |
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* disabled after stopping it. This ensures that the video buffers queue |
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* state can be properly initialized before buffers are accessed from the |
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* interrupt handler. |
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* |
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* Enabling the video queue initializes parameters (such as sequence number, |
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* sync pattern, ...). If the queue is already enabled, return -EBUSY. |
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* |
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* Disabling the video queue cancels the queue and removes all buffers from |
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* the main queue. |
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* |
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* This function can't be called from interrupt context. Use |
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* uvcg_queue_cancel() instead. |
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*/ |
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int uvcg_queue_enable(struct uvc_video_queue *queue, int enable) |
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{ |
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unsigned long flags; |
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int ret = 0; |
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if (enable) { |
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ret = vb2_streamon(&queue->queue, queue->queue.type); |
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if (ret < 0) |
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return ret; |
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queue->sequence = 0; |
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queue->buf_used = 0; |
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} else { |
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ret = vb2_streamoff(&queue->queue, queue->queue.type); |
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if (ret < 0) |
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return ret; |
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spin_lock_irqsave(&queue->irqlock, flags); |
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INIT_LIST_HEAD(&queue->irqqueue); |
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/* |
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* FIXME: We need to clear the DISCONNECTED flag to ensure that |
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* applications will be able to queue buffers for the next |
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* streaming run. However, clearing it here doesn't guarantee |
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* that the device will be reconnected in the meantime. |
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*/ |
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queue->flags &= ~UVC_QUEUE_DISCONNECTED; |
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spin_unlock_irqrestore(&queue->irqlock, flags); |
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} |
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return ret; |
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} |
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/* called with &queue_irqlock held.. */ |
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struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue, |
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struct uvc_buffer *buf) |
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{ |
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struct uvc_buffer *nextbuf; |
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if ((queue->flags & UVC_QUEUE_DROP_INCOMPLETE) && |
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buf->length != buf->bytesused) { |
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buf->state = UVC_BUF_STATE_QUEUED; |
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vb2_set_plane_payload(&buf->buf.vb2_buf, 0, 0); |
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return buf; |
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} |
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list_del(&buf->queue); |
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if (!list_empty(&queue->irqqueue)) |
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nextbuf = list_first_entry(&queue->irqqueue, struct uvc_buffer, |
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queue); |
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else |
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nextbuf = NULL; |
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buf->buf.field = V4L2_FIELD_NONE; |
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buf->buf.sequence = queue->sequence++; |
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buf->buf.vb2_buf.timestamp = ktime_get_ns(); |
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vb2_set_plane_payload(&buf->buf.vb2_buf, 0, buf->bytesused); |
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vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE); |
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return nextbuf; |
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} |
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struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue) |
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{ |
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struct uvc_buffer *buf = NULL; |
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if (!list_empty(&queue->irqqueue)) |
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buf = list_first_entry(&queue->irqqueue, struct uvc_buffer, |
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queue); |
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else |
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queue->flags |= UVC_QUEUE_PAUSED; |
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return buf; |
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} |
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