1099 lines
24 KiB
C
1099 lines
24 KiB
C
/*
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* generic helper functions for handling video4linux capture buffers
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*
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* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
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*
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* Highly based on video-buf written originally by:
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* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
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* (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
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* (c) 2006 Ted Walther and John Sokol
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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
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <media/videobuf-core.h>
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#define MAGIC_BUFFER 0x20070728
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#define MAGIC_CHECK(is, should) do { \
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if (unlikely((is) != (should))) { \
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printk(KERN_ERR "magic mismatch: %x (expected %x)\n", is, should); \
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BUG(); } } while (0)
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static int debug;
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module_param(debug, int, 0644);
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MODULE_DESCRIPTION("helper module to manage video4linux buffers");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
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MODULE_LICENSE("GPL");
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#define dprintk(level, fmt, arg...) do { \
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if (debug >= level) \
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printk(KERN_DEBUG "vbuf: " fmt , ## arg); } while (0)
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/* --------------------------------------------------------------------- */
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#define CALL(q, f, arg...) \
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((q->int_ops->f) ? q->int_ops->f(arg) : 0)
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void *videobuf_alloc(struct videobuf_queue *q)
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{
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struct videobuf_buffer *vb;
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BUG_ON(q->msize < sizeof(*vb));
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if (!q->int_ops || !q->int_ops->alloc) {
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printk(KERN_ERR "No specific ops defined!\n");
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BUG();
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}
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vb = q->int_ops->alloc(q->msize);
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if (NULL != vb) {
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init_waitqueue_head(&vb->done);
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vb->magic = MAGIC_BUFFER;
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}
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return vb;
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}
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int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
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{
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int retval = 0;
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DECLARE_WAITQUEUE(wait, current);
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MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
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add_wait_queue(&vb->done, &wait);
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while (vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) {
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if (non_blocking) {
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retval = -EAGAIN;
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break;
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}
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set_current_state(intr ? TASK_INTERRUPTIBLE
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: TASK_UNINTERRUPTIBLE);
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if (vb->state == VIDEOBUF_ACTIVE ||
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vb->state == VIDEOBUF_QUEUED)
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schedule();
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set_current_state(TASK_RUNNING);
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if (intr && signal_pending(current)) {
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dprintk(1, "buffer waiton: -EINTR\n");
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retval = -EINTR;
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break;
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}
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}
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remove_wait_queue(&vb->done, &wait);
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return retval;
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}
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int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
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struct v4l2_framebuffer *fbuf)
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{
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MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
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MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
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/* This is required to avoid OOPS on some cases,
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since mmap_mapper() method should be called before _iolock.
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On some cases, the mmap_mapper() is called only after scheduling.
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*/
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if (vb->memory == V4L2_MEMORY_MMAP) {
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wait_event_timeout(vb->done, q->is_mmapped,
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msecs_to_jiffies(100));
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if (!q->is_mmapped) {
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printk(KERN_ERR
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"Error: mmap_mapper() never called!\n");
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return -EINVAL;
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}
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}
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return CALL(q, iolock, q, vb, fbuf);
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}
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/* --------------------------------------------------------------------- */
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void videobuf_queue_core_init(struct videobuf_queue *q,
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struct videobuf_queue_ops *ops,
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void *dev,
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spinlock_t *irqlock,
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enum v4l2_buf_type type,
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enum v4l2_field field,
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unsigned int msize,
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void *priv,
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struct videobuf_qtype_ops *int_ops)
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{
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memset(q, 0, sizeof(*q));
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q->irqlock = irqlock;
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q->dev = dev;
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q->type = type;
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q->field = field;
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q->msize = msize;
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q->ops = ops;
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q->priv_data = priv;
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q->int_ops = int_ops;
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/* All buffer operations are mandatory */
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BUG_ON(!q->ops->buf_setup);
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BUG_ON(!q->ops->buf_prepare);
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BUG_ON(!q->ops->buf_queue);
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BUG_ON(!q->ops->buf_release);
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/* Having implementations for abstract methods are mandatory */
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BUG_ON(!q->int_ops);
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mutex_init(&q->vb_lock);
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INIT_LIST_HEAD(&q->stream);
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}
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/* Locking: Only usage in bttv unsafe find way to remove */
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int videobuf_queue_is_busy(struct videobuf_queue *q)
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{
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int i;
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MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
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if (q->streaming) {
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dprintk(1, "busy: streaming active\n");
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return 1;
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}
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if (q->reading) {
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dprintk(1, "busy: pending read #1\n");
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return 1;
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}
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if (q->read_buf) {
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dprintk(1, "busy: pending read #2\n");
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return 1;
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}
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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if (q->bufs[i]->map) {
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dprintk(1, "busy: buffer #%d mapped\n", i);
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return 1;
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}
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if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
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dprintk(1, "busy: buffer #%d queued\n", i);
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return 1;
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}
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if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
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dprintk(1, "busy: buffer #%d avtive\n", i);
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return 1;
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}
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}
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return 0;
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}
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/* Locking: Caller holds q->vb_lock */
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void videobuf_queue_cancel(struct videobuf_queue *q)
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{
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unsigned long flags = 0;
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int i;
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/* remove queued buffers from list */
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if (q->irqlock)
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spin_lock_irqsave(q->irqlock, flags);
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
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list_del(&q->bufs[i]->queue);
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q->bufs[i]->state = VIDEOBUF_ERROR;
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}
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}
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if (q->irqlock)
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spin_unlock_irqrestore(q->irqlock, flags);
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/* free all buffers + clear queue */
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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q->ops->buf_release(q, q->bufs[i]);
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}
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INIT_LIST_HEAD(&q->stream);
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}
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/* --------------------------------------------------------------------- */
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/* Locking: Caller holds q->vb_lock */
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enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
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{
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enum v4l2_field field = q->field;
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BUG_ON(V4L2_FIELD_ANY == field);
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if (V4L2_FIELD_ALTERNATE == field) {
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if (V4L2_FIELD_TOP == q->last) {
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field = V4L2_FIELD_BOTTOM;
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q->last = V4L2_FIELD_BOTTOM;
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} else {
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field = V4L2_FIELD_TOP;
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q->last = V4L2_FIELD_TOP;
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}
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}
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return field;
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}
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/* Locking: Caller holds q->vb_lock */
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static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
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struct videobuf_buffer *vb, enum v4l2_buf_type type)
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{
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MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
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MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
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b->index = vb->i;
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b->type = type;
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b->memory = vb->memory;
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switch (b->memory) {
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case V4L2_MEMORY_MMAP:
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b->m.offset = vb->boff;
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b->length = vb->bsize;
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break;
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case V4L2_MEMORY_USERPTR:
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b->m.userptr = vb->baddr;
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b->length = vb->bsize;
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break;
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case V4L2_MEMORY_OVERLAY:
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b->m.offset = vb->boff;
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break;
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}
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b->flags = 0;
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if (vb->map)
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b->flags |= V4L2_BUF_FLAG_MAPPED;
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switch (vb->state) {
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case VIDEOBUF_PREPARED:
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case VIDEOBUF_QUEUED:
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case VIDEOBUF_ACTIVE:
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b->flags |= V4L2_BUF_FLAG_QUEUED;
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break;
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case VIDEOBUF_DONE:
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case VIDEOBUF_ERROR:
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b->flags |= V4L2_BUF_FLAG_DONE;
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break;
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case VIDEOBUF_NEEDS_INIT:
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case VIDEOBUF_IDLE:
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/* nothing */
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break;
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}
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if (vb->input != UNSET) {
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b->flags |= V4L2_BUF_FLAG_INPUT;
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b->input = vb->input;
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}
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b->field = vb->field;
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b->timestamp = vb->ts;
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b->bytesused = vb->size;
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b->sequence = vb->field_count >> 1;
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}
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/* Locking: Caller holds q->vb_lock */
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static int __videobuf_mmap_free(struct videobuf_queue *q)
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{
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int i;
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int rc;
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if (!q)
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return 0;
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MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
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|
|
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rc = CALL(q, mmap_free, q);
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q->is_mmapped = 0;
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if (rc < 0)
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return rc;
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|
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for (i = 0; i < VIDEO_MAX_FRAME; i++) {
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if (NULL == q->bufs[i])
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continue;
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q->ops->buf_release(q, q->bufs[i]);
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kfree(q->bufs[i]);
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q->bufs[i] = NULL;
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}
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|
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return rc;
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|
}
|
|
|
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int videobuf_mmap_free(struct videobuf_queue *q)
|
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{
|
|
int ret;
|
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mutex_lock(&q->vb_lock);
|
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ret = __videobuf_mmap_free(q);
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mutex_unlock(&q->vb_lock);
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return ret;
|
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}
|
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|
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/* Locking: Caller holds q->vb_lock */
|
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static int __videobuf_mmap_setup(struct videobuf_queue *q,
|
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unsigned int bcount, unsigned int bsize,
|
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enum v4l2_memory memory)
|
|
{
|
|
unsigned int i;
|
|
int err;
|
|
|
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MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
err = __videobuf_mmap_free(q);
|
|
if (0 != err)
|
|
return err;
|
|
|
|
/* Allocate and initialize buffers */
|
|
for (i = 0; i < bcount; i++) {
|
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q->bufs[i] = videobuf_alloc(q);
|
|
|
|
if (q->bufs[i] == NULL)
|
|
break;
|
|
|
|
q->bufs[i]->i = i;
|
|
q->bufs[i]->input = UNSET;
|
|
q->bufs[i]->memory = memory;
|
|
q->bufs[i]->bsize = bsize;
|
|
switch (memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
q->bufs[i]->boff = bsize * i;
|
|
break;
|
|
case V4L2_MEMORY_USERPTR:
|
|
case V4L2_MEMORY_OVERLAY:
|
|
/* nothing */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!i)
|
|
return -ENOMEM;
|
|
|
|
dprintk(1, "mmap setup: %d buffers, %d bytes each\n",
|
|
i, bsize);
|
|
|
|
return i;
|
|
}
|
|
|
|
int videobuf_mmap_setup(struct videobuf_queue *q,
|
|
unsigned int bcount, unsigned int bsize,
|
|
enum v4l2_memory memory)
|
|
{
|
|
int ret;
|
|
mutex_lock(&q->vb_lock);
|
|
ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
|
|
mutex_unlock(&q->vb_lock);
|
|
return ret;
|
|
}
|
|
|
|
int videobuf_reqbufs(struct videobuf_queue *q,
|
|
struct v4l2_requestbuffers *req)
|
|
{
|
|
unsigned int size, count;
|
|
int retval;
|
|
|
|
if (req->count < 1) {
|
|
dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (req->memory != V4L2_MEMORY_MMAP &&
|
|
req->memory != V4L2_MEMORY_USERPTR &&
|
|
req->memory != V4L2_MEMORY_OVERLAY) {
|
|
dprintk(1, "reqbufs: memory type invalid\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
if (req->type != q->type) {
|
|
dprintk(1, "reqbufs: queue type invalid\n");
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (q->streaming) {
|
|
dprintk(1, "reqbufs: streaming already exists\n");
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
if (!list_empty(&q->stream)) {
|
|
dprintk(1, "reqbufs: stream running\n");
|
|
retval = -EBUSY;
|
|
goto done;
|
|
}
|
|
|
|
count = req->count;
|
|
if (count > VIDEO_MAX_FRAME)
|
|
count = VIDEO_MAX_FRAME;
|
|
size = 0;
|
|
q->ops->buf_setup(q, &count, &size);
|
|
size = PAGE_ALIGN(size);
|
|
dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
|
|
count, size, (count*size)>>PAGE_SHIFT);
|
|
|
|
retval = __videobuf_mmap_setup(q, count, size, req->memory);
|
|
if (retval < 0) {
|
|
dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
|
|
goto done;
|
|
}
|
|
|
|
req->count = retval;
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
if (unlikely(b->type != q->type)) {
|
|
dprintk(1, "querybuf: Wrong type.\n");
|
|
goto done;
|
|
}
|
|
if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
|
|
dprintk(1, "querybuf: index out of range.\n");
|
|
goto done;
|
|
}
|
|
if (unlikely(NULL == q->bufs[b->index])) {
|
|
dprintk(1, "querybuf: buffer is null.\n");
|
|
goto done;
|
|
}
|
|
|
|
videobuf_status(q, b, q->bufs[b->index], q->type);
|
|
|
|
ret = 0;
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return ret;
|
|
}
|
|
|
|
int videobuf_qbuf(struct videobuf_queue *q,
|
|
struct v4l2_buffer *b)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
enum v4l2_field field;
|
|
unsigned long flags = 0;
|
|
int retval;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
if (b->memory == V4L2_MEMORY_MMAP)
|
|
down_read(¤t->mm->mmap_sem);
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
retval = -EBUSY;
|
|
if (q->reading) {
|
|
dprintk(1, "qbuf: Reading running...\n");
|
|
goto done;
|
|
}
|
|
retval = -EINVAL;
|
|
if (b->type != q->type) {
|
|
dprintk(1, "qbuf: Wrong type.\n");
|
|
goto done;
|
|
}
|
|
if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
|
|
dprintk(1, "qbuf: index out of range.\n");
|
|
goto done;
|
|
}
|
|
buf = q->bufs[b->index];
|
|
if (NULL == buf) {
|
|
dprintk(1, "qbuf: buffer is null.\n");
|
|
goto done;
|
|
}
|
|
MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
|
|
if (buf->memory != b->memory) {
|
|
dprintk(1, "qbuf: memory type is wrong.\n");
|
|
goto done;
|
|
}
|
|
if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) {
|
|
dprintk(1, "qbuf: buffer is already queued or active.\n");
|
|
goto done;
|
|
}
|
|
|
|
if (b->flags & V4L2_BUF_FLAG_INPUT) {
|
|
if (b->input >= q->inputs) {
|
|
dprintk(1, "qbuf: wrong input.\n");
|
|
goto done;
|
|
}
|
|
buf->input = b->input;
|
|
} else {
|
|
buf->input = UNSET;
|
|
}
|
|
|
|
switch (b->memory) {
|
|
case V4L2_MEMORY_MMAP:
|
|
if (0 == buf->baddr) {
|
|
dprintk(1, "qbuf: mmap requested "
|
|
"but buffer addr is zero!\n");
|
|
goto done;
|
|
}
|
|
break;
|
|
case V4L2_MEMORY_USERPTR:
|
|
if (b->length < buf->bsize) {
|
|
dprintk(1, "qbuf: buffer length is not enough\n");
|
|
goto done;
|
|
}
|
|
if (VIDEOBUF_NEEDS_INIT != buf->state &&
|
|
buf->baddr != b->m.userptr)
|
|
q->ops->buf_release(q, buf);
|
|
buf->baddr = b->m.userptr;
|
|
break;
|
|
case V4L2_MEMORY_OVERLAY:
|
|
buf->boff = b->m.offset;
|
|
break;
|
|
default:
|
|
dprintk(1, "qbuf: wrong memory type\n");
|
|
goto done;
|
|
}
|
|
|
|
dprintk(1, "qbuf: requesting next field\n");
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q, buf, field);
|
|
if (0 != retval) {
|
|
dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
|
|
goto done;
|
|
}
|
|
|
|
list_add_tail(&buf->stream, &q->stream);
|
|
if (q->streaming) {
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
q->ops->buf_queue(q, buf);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
}
|
|
dprintk(1, "qbuf: succeded\n");
|
|
retval = 0;
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
|
|
if (b->memory == V4L2_MEMORY_MMAP)
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_dqbuf(struct videobuf_queue *q,
|
|
struct v4l2_buffer *b, int nonblocking)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
int retval;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
retval = -EBUSY;
|
|
if (q->reading) {
|
|
dprintk(1, "dqbuf: Reading running...\n");
|
|
goto done;
|
|
}
|
|
retval = -EINVAL;
|
|
if (b->type != q->type) {
|
|
dprintk(1, "dqbuf: Wrong type.\n");
|
|
goto done;
|
|
}
|
|
if (list_empty(&q->stream)) {
|
|
dprintk(1, "dqbuf: stream running\n");
|
|
goto done;
|
|
}
|
|
buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
|
|
retval = videobuf_waiton(buf, nonblocking, 1);
|
|
if (retval < 0) {
|
|
dprintk(1, "dqbuf: waiton returned %d\n", retval);
|
|
goto done;
|
|
}
|
|
switch (buf->state) {
|
|
case VIDEOBUF_ERROR:
|
|
dprintk(1, "dqbuf: state is error\n");
|
|
retval = -EIO;
|
|
CALL(q, sync, q, buf);
|
|
buf->state = VIDEOBUF_IDLE;
|
|
break;
|
|
case VIDEOBUF_DONE:
|
|
dprintk(1, "dqbuf: state is done\n");
|
|
CALL(q, sync, q, buf);
|
|
buf->state = VIDEOBUF_IDLE;
|
|
break;
|
|
default:
|
|
dprintk(1, "dqbuf: state invalid\n");
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
list_del(&buf->stream);
|
|
memset(b, 0, sizeof(*b));
|
|
videobuf_status(q, b, buf, q->type);
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return retval;
|
|
}
|
|
|
|
int videobuf_streamon(struct videobuf_queue *q)
|
|
{
|
|
struct videobuf_buffer *buf;
|
|
unsigned long flags = 0;
|
|
int retval;
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
retval = -EBUSY;
|
|
if (q->reading)
|
|
goto done;
|
|
retval = 0;
|
|
if (q->streaming)
|
|
goto done;
|
|
q->streaming = 1;
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
list_for_each_entry(buf, &q->stream, stream)
|
|
if (buf->state == VIDEOBUF_PREPARED)
|
|
q->ops->buf_queue(q, buf);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return retval;
|
|
}
|
|
|
|
/* Locking: Caller holds q->vb_lock */
|
|
static int __videobuf_streamoff(struct videobuf_queue *q)
|
|
{
|
|
if (!q->streaming)
|
|
return -EINVAL;
|
|
|
|
videobuf_queue_cancel(q);
|
|
q->streaming = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int videobuf_streamoff(struct videobuf_queue *q)
|
|
{
|
|
int retval;
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
retval = __videobuf_streamoff(q);
|
|
mutex_unlock(&q->vb_lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* Locking: Caller holds q->vb_lock */
|
|
static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
|
|
char __user *data,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags = 0;
|
|
int retval;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
/* setup stuff */
|
|
q->read_buf = videobuf_alloc(q);
|
|
if (NULL == q->read_buf)
|
|
return -ENOMEM;
|
|
|
|
q->read_buf->memory = V4L2_MEMORY_USERPTR;
|
|
q->read_buf->baddr = (unsigned long)data;
|
|
q->read_buf->bsize = count;
|
|
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q, q->read_buf, field);
|
|
if (0 != retval)
|
|
goto done;
|
|
|
|
/* start capture & wait */
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
q->ops->buf_queue(q, q->read_buf);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
retval = videobuf_waiton(q->read_buf, 0, 0);
|
|
if (0 == retval) {
|
|
CALL(q, sync, q, q->read_buf);
|
|
if (VIDEOBUF_ERROR == q->read_buf->state)
|
|
retval = -EIO;
|
|
else
|
|
retval = q->read_buf->size;
|
|
}
|
|
|
|
done:
|
|
/* cleanup */
|
|
q->ops->buf_release(q, q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
return retval;
|
|
}
|
|
|
|
ssize_t videobuf_read_one(struct videobuf_queue *q,
|
|
char __user *data, size_t count, loff_t *ppos,
|
|
int nonblocking)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags = 0;
|
|
unsigned size, nbufs;
|
|
int retval;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
|
|
nbufs = 1; size = 0;
|
|
q->ops->buf_setup(q, &nbufs, &size);
|
|
|
|
if (NULL == q->read_buf &&
|
|
count >= size &&
|
|
!nonblocking) {
|
|
retval = videobuf_read_zerocopy(q, data, count, ppos);
|
|
if (retval >= 0 || retval == -EIO)
|
|
/* ok, all done */
|
|
goto done;
|
|
/* fallback to kernel bounce buffer on failures */
|
|
}
|
|
|
|
if (NULL == q->read_buf) {
|
|
/* need to capture a new frame */
|
|
retval = -ENOMEM;
|
|
q->read_buf = videobuf_alloc(q);
|
|
|
|
dprintk(1, "video alloc=0x%p\n", q->read_buf);
|
|
if (NULL == q->read_buf)
|
|
goto done;
|
|
q->read_buf->memory = V4L2_MEMORY_USERPTR;
|
|
q->read_buf->bsize = count; /* preferred size */
|
|
field = videobuf_next_field(q);
|
|
retval = q->ops->buf_prepare(q, q->read_buf, field);
|
|
|
|
if (0 != retval) {
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
goto done;
|
|
}
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
|
|
q->ops->buf_queue(q, q->read_buf);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
q->read_off = 0;
|
|
}
|
|
|
|
/* wait until capture is done */
|
|
retval = videobuf_waiton(q->read_buf, nonblocking, 1);
|
|
if (0 != retval)
|
|
goto done;
|
|
|
|
CALL(q, sync, q, q->read_buf);
|
|
|
|
if (VIDEOBUF_ERROR == q->read_buf->state) {
|
|
/* catch I/O errors */
|
|
q->ops->buf_release(q, q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
retval = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
/* Copy to userspace */
|
|
retval = CALL(q, video_copy_to_user, q, data, count, nonblocking);
|
|
if (retval < 0)
|
|
goto done;
|
|
|
|
q->read_off += retval;
|
|
if (q->read_off == q->read_buf->size) {
|
|
/* all data copied, cleanup */
|
|
q->ops->buf_release(q, q->read_buf);
|
|
kfree(q->read_buf);
|
|
q->read_buf = NULL;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return retval;
|
|
}
|
|
|
|
/* Locking: Caller holds q->vb_lock */
|
|
static int __videobuf_read_start(struct videobuf_queue *q)
|
|
{
|
|
enum v4l2_field field;
|
|
unsigned long flags = 0;
|
|
unsigned int count = 0, size = 0;
|
|
int err, i;
|
|
|
|
q->ops->buf_setup(q, &count, &size);
|
|
if (count < 2)
|
|
count = 2;
|
|
if (count > VIDEO_MAX_FRAME)
|
|
count = VIDEO_MAX_FRAME;
|
|
size = PAGE_ALIGN(size);
|
|
|
|
err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
count = err;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
field = videobuf_next_field(q);
|
|
err = q->ops->buf_prepare(q, q->bufs[i], field);
|
|
if (err)
|
|
return err;
|
|
list_add_tail(&q->bufs[i]->stream, &q->stream);
|
|
}
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
for (i = 0; i < count; i++)
|
|
q->ops->buf_queue(q, q->bufs[i]);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
q->reading = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void __videobuf_read_stop(struct videobuf_queue *q)
|
|
{
|
|
int i;
|
|
|
|
|
|
videobuf_queue_cancel(q);
|
|
__videobuf_mmap_free(q);
|
|
INIT_LIST_HEAD(&q->stream);
|
|
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
|
|
if (NULL == q->bufs[i])
|
|
continue;
|
|
kfree(q->bufs[i]);
|
|
q->bufs[i] = NULL;
|
|
}
|
|
q->read_buf = NULL;
|
|
q->reading = 0;
|
|
|
|
}
|
|
|
|
int videobuf_read_start(struct videobuf_queue *q)
|
|
{
|
|
int rc;
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
rc = __videobuf_read_start(q);
|
|
mutex_unlock(&q->vb_lock);
|
|
|
|
return rc;
|
|
}
|
|
|
|
void videobuf_read_stop(struct videobuf_queue *q)
|
|
{
|
|
mutex_lock(&q->vb_lock);
|
|
__videobuf_read_stop(q);
|
|
mutex_unlock(&q->vb_lock);
|
|
}
|
|
|
|
void videobuf_stop(struct videobuf_queue *q)
|
|
{
|
|
mutex_lock(&q->vb_lock);
|
|
|
|
if (q->streaming)
|
|
__videobuf_streamoff(q);
|
|
|
|
if (q->reading)
|
|
__videobuf_read_stop(q);
|
|
|
|
mutex_unlock(&q->vb_lock);
|
|
}
|
|
|
|
|
|
ssize_t videobuf_read_stream(struct videobuf_queue *q,
|
|
char __user *data, size_t count, loff_t *ppos,
|
|
int vbihack, int nonblocking)
|
|
{
|
|
int rc, retval;
|
|
unsigned long flags = 0;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
dprintk(2, "%s\n", __FUNCTION__);
|
|
mutex_lock(&q->vb_lock);
|
|
retval = -EBUSY;
|
|
if (q->streaming)
|
|
goto done;
|
|
if (!q->reading) {
|
|
retval = __videobuf_read_start(q);
|
|
if (retval < 0)
|
|
goto done;
|
|
}
|
|
|
|
retval = 0;
|
|
while (count > 0) {
|
|
/* get / wait for data */
|
|
if (NULL == q->read_buf) {
|
|
q->read_buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer,
|
|
stream);
|
|
list_del(&q->read_buf->stream);
|
|
q->read_off = 0;
|
|
}
|
|
rc = videobuf_waiton(q->read_buf, nonblocking, 1);
|
|
if (rc < 0) {
|
|
if (0 == retval)
|
|
retval = rc;
|
|
break;
|
|
}
|
|
|
|
if (q->read_buf->state == VIDEOBUF_DONE) {
|
|
rc = CALL(q, copy_stream, q, data + retval, count,
|
|
retval, vbihack, nonblocking);
|
|
if (rc < 0) {
|
|
retval = rc;
|
|
break;
|
|
}
|
|
retval += rc;
|
|
count -= rc;
|
|
q->read_off += rc;
|
|
} else {
|
|
/* some error */
|
|
q->read_off = q->read_buf->size;
|
|
if (0 == retval)
|
|
retval = -EIO;
|
|
}
|
|
|
|
/* requeue buffer when done with copying */
|
|
if (q->read_off == q->read_buf->size) {
|
|
list_add_tail(&q->read_buf->stream,
|
|
&q->stream);
|
|
if (q->irqlock)
|
|
spin_lock_irqsave(q->irqlock, flags);
|
|
q->ops->buf_queue(q, q->read_buf);
|
|
if (q->irqlock)
|
|
spin_unlock_irqrestore(q->irqlock, flags);
|
|
q->read_buf = NULL;
|
|
}
|
|
if (retval < 0)
|
|
break;
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&q->vb_lock);
|
|
return retval;
|
|
}
|
|
|
|
unsigned int videobuf_poll_stream(struct file *file,
|
|
struct videobuf_queue *q,
|
|
poll_table *wait)
|
|
{
|
|
struct videobuf_buffer *buf = NULL;
|
|
unsigned int rc = 0;
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
if (q->streaming) {
|
|
if (!list_empty(&q->stream))
|
|
buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer, stream);
|
|
} else {
|
|
if (!q->reading)
|
|
__videobuf_read_start(q);
|
|
if (!q->reading) {
|
|
rc = POLLERR;
|
|
} else if (NULL == q->read_buf) {
|
|
q->read_buf = list_entry(q->stream.next,
|
|
struct videobuf_buffer,
|
|
stream);
|
|
list_del(&q->read_buf->stream);
|
|
q->read_off = 0;
|
|
}
|
|
buf = q->read_buf;
|
|
}
|
|
if (!buf)
|
|
rc = POLLERR;
|
|
|
|
if (0 == rc) {
|
|
poll_wait(file, &buf->done, wait);
|
|
if (buf->state == VIDEOBUF_DONE ||
|
|
buf->state == VIDEOBUF_ERROR)
|
|
rc = POLLIN|POLLRDNORM;
|
|
}
|
|
mutex_unlock(&q->vb_lock);
|
|
return rc;
|
|
}
|
|
|
|
int videobuf_mmap_mapper(struct videobuf_queue *q,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
int retval;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
mutex_lock(&q->vb_lock);
|
|
retval = CALL(q, mmap_mapper, q, vma);
|
|
q->is_mmapped = 1;
|
|
mutex_unlock(&q->vb_lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_VIDEO_V4L1_COMPAT
|
|
int videobuf_cgmbuf(struct videobuf_queue *q,
|
|
struct video_mbuf *mbuf, int count)
|
|
{
|
|
struct v4l2_requestbuffers req;
|
|
int rc, i;
|
|
|
|
MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
|
|
|
|
memset(&req, 0, sizeof(req));
|
|
req.type = q->type;
|
|
req.count = count;
|
|
req.memory = V4L2_MEMORY_MMAP;
|
|
rc = videobuf_reqbufs(q, &req);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
mbuf->frames = req.count;
|
|
mbuf->size = 0;
|
|
for (i = 0; i < mbuf->frames; i++) {
|
|
mbuf->offsets[i] = q->bufs[i]->boff;
|
|
mbuf->size += q->bufs[i]->bsize;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
|
|
#endif
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_waiton);
|
|
EXPORT_SYMBOL_GPL(videobuf_iolock);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_alloc);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
|
|
EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
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|
EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
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|
|
|
EXPORT_SYMBOL_GPL(videobuf_next_field);
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|
EXPORT_SYMBOL_GPL(videobuf_reqbufs);
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|
EXPORT_SYMBOL_GPL(videobuf_querybuf);
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|
EXPORT_SYMBOL_GPL(videobuf_qbuf);
|
|
EXPORT_SYMBOL_GPL(videobuf_dqbuf);
|
|
EXPORT_SYMBOL_GPL(videobuf_streamon);
|
|
EXPORT_SYMBOL_GPL(videobuf_streamoff);
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|
|
|
EXPORT_SYMBOL_GPL(videobuf_read_start);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_stop);
|
|
EXPORT_SYMBOL_GPL(videobuf_stop);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_stream);
|
|
EXPORT_SYMBOL_GPL(videobuf_read_one);
|
|
EXPORT_SYMBOL_GPL(videobuf_poll_stream);
|
|
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_free);
|
|
EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
|