353 lines
9.5 KiB
C
353 lines
9.5 KiB
C
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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 (laurent.pinchart@ideasonboard.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 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, 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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unsigned int 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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