2 * generic helper functions for handling video4linux capture buffers
4 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
6 * Highly based on video-buf written originally by:
7 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
8 * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
9 * (c) 2006 Ted Walther and John Sokol
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
20 #include <linux/sched.h>
21 #include <linux/slab.h>
22 #include <linux/interrupt.h>
24 #include <media/videobuf-core.h>
26 #define MAGIC_BUFFER 0x20070728
27 #define MAGIC_CHECK(is, should) \
29 if (unlikely((is) != (should))) { \
31 "magic mismatch: %x (expected %x)\n", \
38 module_param(debug, int, 0644);
40 MODULE_DESCRIPTION("helper module to manage video4linux buffers");
41 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
42 MODULE_LICENSE("GPL");
44 #define dprintk(level, fmt, arg...) \
47 printk(KERN_DEBUG "vbuf: " fmt, ## arg); \
50 /* --------------------------------------------------------------------- */
52 #define CALL(q, f, arg...) \
53 ((q->int_ops->f) ? q->int_ops->f(arg) : 0)
55 struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q)
57 struct videobuf_buffer *vb;
59 BUG_ON(q->msize < sizeof(*vb));
61 if (!q->int_ops || !q->int_ops->alloc_vb) {
62 printk(KERN_ERR "No specific ops defined!\n");
66 vb = q->int_ops->alloc_vb(q->msize);
68 init_waitqueue_head(&vb->done);
69 vb->magic = MAGIC_BUFFER;
74 EXPORT_SYMBOL_GPL(videobuf_alloc_vb);
76 #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\
77 vb->state != VIDEOBUF_QUEUED)
78 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
80 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
90 return wait_event_interruptible(vb->done, WAITON_CONDITION);
92 wait_event(vb->done, WAITON_CONDITION);
96 EXPORT_SYMBOL_GPL(videobuf_waiton);
98 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
99 struct v4l2_framebuffer *fbuf)
101 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
102 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
104 return CALL(q, iolock, q, vb, fbuf);
106 EXPORT_SYMBOL_GPL(videobuf_iolock);
108 void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
109 struct videobuf_buffer *buf)
111 if (q->int_ops->vaddr)
112 return q->int_ops->vaddr(buf);
115 EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr);
117 /* --------------------------------------------------------------------- */
120 void videobuf_queue_core_init(struct videobuf_queue *q,
121 const struct videobuf_queue_ops *ops,
124 enum v4l2_buf_type type,
125 enum v4l2_field field,
128 struct videobuf_qtype_ops *int_ops)
131 memset(q, 0, sizeof(*q));
132 q->irqlock = irqlock;
139 q->int_ops = int_ops;
141 /* All buffer operations are mandatory */
142 BUG_ON(!q->ops->buf_setup);
143 BUG_ON(!q->ops->buf_prepare);
144 BUG_ON(!q->ops->buf_queue);
145 BUG_ON(!q->ops->buf_release);
147 /* Lock is mandatory for queue_cancel to work */
150 /* Having implementations for abstract methods are mandatory */
153 mutex_init(&q->vb_lock);
154 init_waitqueue_head(&q->wait);
155 INIT_LIST_HEAD(&q->stream);
157 EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
159 /* Locking: Only usage in bttv unsafe find way to remove */
160 int videobuf_queue_is_busy(struct videobuf_queue *q)
164 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
167 dprintk(1, "busy: streaming active\n");
171 dprintk(1, "busy: pending read #1\n");
175 dprintk(1, "busy: pending read #2\n");
178 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
179 if (NULL == q->bufs[i])
181 if (q->bufs[i]->map) {
182 dprintk(1, "busy: buffer #%d mapped\n", i);
185 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
186 dprintk(1, "busy: buffer #%d queued\n", i);
189 if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
190 dprintk(1, "busy: buffer #%d avtive\n", i);
196 EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
199 * __videobuf_free() - free all the buffers and their control structures
201 * This function can only be called if streaming/reading is off, i.e. no buffers
202 * are under control of the driver.
204 /* Locking: Caller holds q->vb_lock */
205 static int __videobuf_free(struct videobuf_queue *q)
209 dprintk(1, "%s\n", __func__);
213 if (q->streaming || q->reading) {
214 dprintk(1, "Cannot free buffers when streaming or reading\n");
218 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
220 for (i = 0; i < VIDEO_MAX_FRAME; i++)
221 if (q->bufs[i] && q->bufs[i]->map) {
222 dprintk(1, "Cannot free mmapped buffers\n");
226 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
227 if (NULL == q->bufs[i])
229 q->ops->buf_release(q, q->bufs[i]);
237 /* Locking: Caller holds q->vb_lock */
238 void videobuf_queue_cancel(struct videobuf_queue *q)
240 unsigned long flags = 0;
245 wake_up_interruptible_sync(&q->wait);
247 /* remove queued buffers from list */
248 spin_lock_irqsave(q->irqlock, flags);
249 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
250 if (NULL == q->bufs[i])
252 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
253 list_del(&q->bufs[i]->queue);
254 q->bufs[i]->state = VIDEOBUF_ERROR;
255 wake_up_all(&q->bufs[i]->done);
258 spin_unlock_irqrestore(q->irqlock, flags);
260 /* free all buffers + clear queue */
261 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
262 if (NULL == q->bufs[i])
264 q->ops->buf_release(q, q->bufs[i]);
266 INIT_LIST_HEAD(&q->stream);
268 EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
270 /* --------------------------------------------------------------------- */
272 /* Locking: Caller holds q->vb_lock */
273 enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
275 enum v4l2_field field = q->field;
277 BUG_ON(V4L2_FIELD_ANY == field);
279 if (V4L2_FIELD_ALTERNATE == field) {
280 if (V4L2_FIELD_TOP == q->last) {
281 field = V4L2_FIELD_BOTTOM;
282 q->last = V4L2_FIELD_BOTTOM;
284 field = V4L2_FIELD_TOP;
285 q->last = V4L2_FIELD_TOP;
290 EXPORT_SYMBOL_GPL(videobuf_next_field);
292 /* Locking: Caller holds q->vb_lock */
293 static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
294 struct videobuf_buffer *vb, enum v4l2_buf_type type)
296 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
297 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
302 b->memory = vb->memory;
304 case V4L2_MEMORY_MMAP:
305 b->m.offset = vb->boff;
306 b->length = vb->bsize;
308 case V4L2_MEMORY_USERPTR:
309 b->m.userptr = vb->baddr;
310 b->length = vb->bsize;
312 case V4L2_MEMORY_OVERLAY:
313 b->m.offset = vb->boff;
319 b->flags |= V4L2_BUF_FLAG_MAPPED;
322 case VIDEOBUF_PREPARED:
323 case VIDEOBUF_QUEUED:
324 case VIDEOBUF_ACTIVE:
325 b->flags |= V4L2_BUF_FLAG_QUEUED;
328 b->flags |= V4L2_BUF_FLAG_ERROR;
331 b->flags |= V4L2_BUF_FLAG_DONE;
333 case VIDEOBUF_NEEDS_INIT:
339 if (vb->input != UNSET) {
340 b->flags |= V4L2_BUF_FLAG_INPUT;
341 b->input = vb->input;
344 b->field = vb->field;
345 b->timestamp = vb->ts;
346 b->bytesused = vb->size;
347 b->sequence = vb->field_count >> 1;
350 int videobuf_mmap_free(struct videobuf_queue *q)
353 mutex_lock(&q->vb_lock);
354 ret = __videobuf_free(q);
355 mutex_unlock(&q->vb_lock);
358 EXPORT_SYMBOL_GPL(videobuf_mmap_free);
360 /* Locking: Caller holds q->vb_lock */
361 int __videobuf_mmap_setup(struct videobuf_queue *q,
362 unsigned int bcount, unsigned int bsize,
363 enum v4l2_memory memory)
368 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
370 err = __videobuf_free(q);
374 /* Allocate and initialize buffers */
375 for (i = 0; i < bcount; i++) {
376 q->bufs[i] = videobuf_alloc_vb(q);
378 if (NULL == q->bufs[i])
382 q->bufs[i]->input = UNSET;
383 q->bufs[i]->memory = memory;
384 q->bufs[i]->bsize = bsize;
386 case V4L2_MEMORY_MMAP:
387 q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
389 case V4L2_MEMORY_USERPTR:
390 case V4L2_MEMORY_OVERLAY:
399 dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize);
403 EXPORT_SYMBOL_GPL(__videobuf_mmap_setup);
405 int videobuf_mmap_setup(struct videobuf_queue *q,
406 unsigned int bcount, unsigned int bsize,
407 enum v4l2_memory memory)
410 mutex_lock(&q->vb_lock);
411 ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
412 mutex_unlock(&q->vb_lock);
415 EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
417 int videobuf_reqbufs(struct videobuf_queue *q,
418 struct v4l2_requestbuffers *req)
420 unsigned int size, count;
423 if (req->count < 1) {
424 dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
428 if (req->memory != V4L2_MEMORY_MMAP &&
429 req->memory != V4L2_MEMORY_USERPTR &&
430 req->memory != V4L2_MEMORY_OVERLAY) {
431 dprintk(1, "reqbufs: memory type invalid\n");
435 mutex_lock(&q->vb_lock);
436 if (req->type != q->type) {
437 dprintk(1, "reqbufs: queue type invalid\n");
443 dprintk(1, "reqbufs: streaming already exists\n");
447 if (!list_empty(&q->stream)) {
448 dprintk(1, "reqbufs: stream running\n");
454 if (count > VIDEO_MAX_FRAME)
455 count = VIDEO_MAX_FRAME;
457 q->ops->buf_setup(q, &count, &size);
458 dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n",
460 (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT));
462 retval = __videobuf_mmap_setup(q, count, size, req->memory);
464 dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
472 mutex_unlock(&q->vb_lock);
475 EXPORT_SYMBOL_GPL(videobuf_reqbufs);
477 int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
481 mutex_lock(&q->vb_lock);
482 if (unlikely(b->type != q->type)) {
483 dprintk(1, "querybuf: Wrong type.\n");
486 if (unlikely(b->index >= VIDEO_MAX_FRAME)) {
487 dprintk(1, "querybuf: index out of range.\n");
490 if (unlikely(NULL == q->bufs[b->index])) {
491 dprintk(1, "querybuf: buffer is null.\n");
495 videobuf_status(q, b, q->bufs[b->index], q->type);
499 mutex_unlock(&q->vb_lock);
502 EXPORT_SYMBOL_GPL(videobuf_querybuf);
504 int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
506 struct videobuf_buffer *buf;
507 enum v4l2_field field;
508 unsigned long flags = 0;
511 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
513 if (b->memory == V4L2_MEMORY_MMAP)
514 down_read(¤t->mm->mmap_sem);
516 mutex_lock(&q->vb_lock);
519 dprintk(1, "qbuf: Reading running...\n");
523 if (b->type != q->type) {
524 dprintk(1, "qbuf: Wrong type.\n");
527 if (b->index >= VIDEO_MAX_FRAME) {
528 dprintk(1, "qbuf: index out of range.\n");
531 buf = q->bufs[b->index];
533 dprintk(1, "qbuf: buffer is null.\n");
536 MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
537 if (buf->memory != b->memory) {
538 dprintk(1, "qbuf: memory type is wrong.\n");
541 if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) {
542 dprintk(1, "qbuf: buffer is already queued or active.\n");
546 if (b->flags & V4L2_BUF_FLAG_INPUT) {
547 if (b->input >= q->inputs) {
548 dprintk(1, "qbuf: wrong input.\n");
551 buf->input = b->input;
557 case V4L2_MEMORY_MMAP:
558 if (0 == buf->baddr) {
559 dprintk(1, "qbuf: mmap requested "
560 "but buffer addr is zero!\n");
563 if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT
564 || q->type == V4L2_BUF_TYPE_VBI_OUTPUT
565 || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
566 buf->size = b->bytesused;
567 buf->field = b->field;
568 buf->ts = b->timestamp;
571 case V4L2_MEMORY_USERPTR:
572 if (b->length < buf->bsize) {
573 dprintk(1, "qbuf: buffer length is not enough\n");
576 if (VIDEOBUF_NEEDS_INIT != buf->state &&
577 buf->baddr != b->m.userptr)
578 q->ops->buf_release(q, buf);
579 buf->baddr = b->m.userptr;
581 case V4L2_MEMORY_OVERLAY:
582 buf->boff = b->m.offset;
585 dprintk(1, "qbuf: wrong memory type\n");
589 dprintk(1, "qbuf: requesting next field\n");
590 field = videobuf_next_field(q);
591 retval = q->ops->buf_prepare(q, buf, field);
593 dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
597 list_add_tail(&buf->stream, &q->stream);
599 spin_lock_irqsave(q->irqlock, flags);
600 q->ops->buf_queue(q, buf);
601 spin_unlock_irqrestore(q->irqlock, flags);
603 dprintk(1, "qbuf: succeeded\n");
605 wake_up_interruptible_sync(&q->wait);
608 mutex_unlock(&q->vb_lock);
610 if (b->memory == V4L2_MEMORY_MMAP)
611 up_read(¤t->mm->mmap_sem);
615 EXPORT_SYMBOL_GPL(videobuf_qbuf);
617 /* Locking: Caller holds q->vb_lock */
618 static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock)
624 dprintk(1, "next_buffer: Not streaming\n");
629 if (list_empty(&q->stream)) {
632 dprintk(2, "next_buffer: no buffers to dequeue\n");
635 dprintk(2, "next_buffer: waiting on buffer\n");
637 /* Drop lock to avoid deadlock with qbuf */
638 mutex_unlock(&q->vb_lock);
640 /* Checking list_empty and streaming is safe without
641 * locks because we goto checks to validate while
642 * holding locks before proceeding */
643 retval = wait_event_interruptible(q->wait,
644 !list_empty(&q->stream) || !q->streaming);
645 mutex_lock(&q->vb_lock);
660 /* Locking: Caller holds q->vb_lock */
661 static int stream_next_buffer(struct videobuf_queue *q,
662 struct videobuf_buffer **vb, int nonblocking)
665 struct videobuf_buffer *buf = NULL;
667 retval = stream_next_buffer_check_queue(q, nonblocking);
671 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
672 retval = videobuf_waiton(buf, nonblocking, 1);
681 int videobuf_dqbuf(struct videobuf_queue *q,
682 struct v4l2_buffer *b, int nonblocking)
684 struct videobuf_buffer *buf = NULL;
687 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
689 memset(b, 0, sizeof(*b));
690 mutex_lock(&q->vb_lock);
692 retval = stream_next_buffer(q, &buf, nonblocking);
694 dprintk(1, "dqbuf: next_buffer error: %i\n", retval);
698 switch (buf->state) {
700 dprintk(1, "dqbuf: state is error\n");
703 dprintk(1, "dqbuf: state is done\n");
706 dprintk(1, "dqbuf: state invalid\n");
710 CALL(q, sync, q, buf);
711 videobuf_status(q, b, buf, q->type);
712 list_del(&buf->stream);
713 buf->state = VIDEOBUF_IDLE;
714 b->flags &= ~V4L2_BUF_FLAG_DONE;
716 mutex_unlock(&q->vb_lock);
719 EXPORT_SYMBOL_GPL(videobuf_dqbuf);
721 int videobuf_streamon(struct videobuf_queue *q)
723 struct videobuf_buffer *buf;
724 unsigned long flags = 0;
727 mutex_lock(&q->vb_lock);
735 spin_lock_irqsave(q->irqlock, flags);
736 list_for_each_entry(buf, &q->stream, stream)
737 if (buf->state == VIDEOBUF_PREPARED)
738 q->ops->buf_queue(q, buf);
739 spin_unlock_irqrestore(q->irqlock, flags);
741 wake_up_interruptible_sync(&q->wait);
743 mutex_unlock(&q->vb_lock);
746 EXPORT_SYMBOL_GPL(videobuf_streamon);
748 /* Locking: Caller holds q->vb_lock */
749 static int __videobuf_streamoff(struct videobuf_queue *q)
754 videobuf_queue_cancel(q);
759 int videobuf_streamoff(struct videobuf_queue *q)
763 mutex_lock(&q->vb_lock);
764 retval = __videobuf_streamoff(q);
765 mutex_unlock(&q->vb_lock);
769 EXPORT_SYMBOL_GPL(videobuf_streamoff);
771 /* Locking: Caller holds q->vb_lock */
772 static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
774 size_t count, loff_t *ppos)
776 enum v4l2_field field;
777 unsigned long flags = 0;
780 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
783 q->read_buf = videobuf_alloc_vb(q);
784 if (NULL == q->read_buf)
787 q->read_buf->memory = V4L2_MEMORY_USERPTR;
788 q->read_buf->baddr = (unsigned long)data;
789 q->read_buf->bsize = count;
791 field = videobuf_next_field(q);
792 retval = q->ops->buf_prepare(q, q->read_buf, field);
796 /* start capture & wait */
797 spin_lock_irqsave(q->irqlock, flags);
798 q->ops->buf_queue(q, q->read_buf);
799 spin_unlock_irqrestore(q->irqlock, flags);
800 retval = videobuf_waiton(q->read_buf, 0, 0);
802 CALL(q, sync, q, q->read_buf);
803 if (VIDEOBUF_ERROR == q->read_buf->state)
806 retval = q->read_buf->size;
811 q->ops->buf_release(q, q->read_buf);
817 static int __videobuf_copy_to_user(struct videobuf_queue *q,
818 struct videobuf_buffer *buf,
819 char __user *data, size_t count,
822 void *vaddr = CALL(q, vaddr, buf);
824 /* copy to userspace */
825 if (count > buf->size - q->read_off)
826 count = buf->size - q->read_off;
828 if (copy_to_user(data, vaddr + q->read_off, count))
834 static int __videobuf_copy_stream(struct videobuf_queue *q,
835 struct videobuf_buffer *buf,
836 char __user *data, size_t count, size_t pos,
837 int vbihack, int nonblocking)
839 unsigned int *fc = CALL(q, vaddr, buf);
842 /* dirty, undocumented hack -- pass the frame counter
843 * within the last four bytes of each vbi data block.
844 * We need that one to maintain backward compatibility
845 * to all vbi decoding software out there ... */
846 fc += (buf->size >> 2) - 1;
847 *fc = buf->field_count >> 1;
848 dprintk(1, "vbihack: %d\n", *fc);
851 /* copy stuff using the common method */
852 count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
854 if ((count == -EFAULT) && (pos == 0))
860 ssize_t videobuf_read_one(struct videobuf_queue *q,
861 char __user *data, size_t count, loff_t *ppos,
864 enum v4l2_field field;
865 unsigned long flags = 0;
866 unsigned size = 0, nbufs = 1;
869 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
871 mutex_lock(&q->vb_lock);
873 q->ops->buf_setup(q, &nbufs, &size);
875 if (NULL == q->read_buf &&
878 retval = videobuf_read_zerocopy(q, data, count, ppos);
879 if (retval >= 0 || retval == -EIO)
882 /* fallback to kernel bounce buffer on failures */
885 if (NULL == q->read_buf) {
886 /* need to capture a new frame */
888 q->read_buf = videobuf_alloc_vb(q);
890 dprintk(1, "video alloc=0x%p\n", q->read_buf);
891 if (NULL == q->read_buf)
893 q->read_buf->memory = V4L2_MEMORY_USERPTR;
894 q->read_buf->bsize = count; /* preferred size */
895 field = videobuf_next_field(q);
896 retval = q->ops->buf_prepare(q, q->read_buf, field);
904 spin_lock_irqsave(q->irqlock, flags);
905 q->ops->buf_queue(q, q->read_buf);
906 spin_unlock_irqrestore(q->irqlock, flags);
911 /* wait until capture is done */
912 retval = videobuf_waiton(q->read_buf, nonblocking, 1);
916 CALL(q, sync, q, q->read_buf);
918 if (VIDEOBUF_ERROR == q->read_buf->state) {
919 /* catch I/O errors */
920 q->ops->buf_release(q, q->read_buf);
927 /* Copy to userspace */
928 retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking);
932 q->read_off += retval;
933 if (q->read_off == q->read_buf->size) {
934 /* all data copied, cleanup */
935 q->ops->buf_release(q, q->read_buf);
941 mutex_unlock(&q->vb_lock);
944 EXPORT_SYMBOL_GPL(videobuf_read_one);
946 /* Locking: Caller holds q->vb_lock */
947 static int __videobuf_read_start(struct videobuf_queue *q)
949 enum v4l2_field field;
950 unsigned long flags = 0;
951 unsigned int count = 0, size = 0;
954 q->ops->buf_setup(q, &count, &size);
957 if (count > VIDEO_MAX_FRAME)
958 count = VIDEO_MAX_FRAME;
959 size = PAGE_ALIGN(size);
961 err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
967 for (i = 0; i < count; i++) {
968 field = videobuf_next_field(q);
969 err = q->ops->buf_prepare(q, q->bufs[i], field);
972 list_add_tail(&q->bufs[i]->stream, &q->stream);
974 spin_lock_irqsave(q->irqlock, flags);
975 for (i = 0; i < count; i++)
976 q->ops->buf_queue(q, q->bufs[i]);
977 spin_unlock_irqrestore(q->irqlock, flags);
982 static void __videobuf_read_stop(struct videobuf_queue *q)
986 videobuf_queue_cancel(q);
988 INIT_LIST_HEAD(&q->stream);
989 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
990 if (NULL == q->bufs[i])
998 int videobuf_read_start(struct videobuf_queue *q)
1002 mutex_lock(&q->vb_lock);
1003 rc = __videobuf_read_start(q);
1004 mutex_unlock(&q->vb_lock);
1008 EXPORT_SYMBOL_GPL(videobuf_read_start);
1010 void videobuf_read_stop(struct videobuf_queue *q)
1012 mutex_lock(&q->vb_lock);
1013 __videobuf_read_stop(q);
1014 mutex_unlock(&q->vb_lock);
1016 EXPORT_SYMBOL_GPL(videobuf_read_stop);
1018 void videobuf_stop(struct videobuf_queue *q)
1020 mutex_lock(&q->vb_lock);
1023 __videobuf_streamoff(q);
1026 __videobuf_read_stop(q);
1028 mutex_unlock(&q->vb_lock);
1030 EXPORT_SYMBOL_GPL(videobuf_stop);
1032 ssize_t videobuf_read_stream(struct videobuf_queue *q,
1033 char __user *data, size_t count, loff_t *ppos,
1034 int vbihack, int nonblocking)
1037 unsigned long flags = 0;
1039 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1041 dprintk(2, "%s\n", __func__);
1042 mutex_lock(&q->vb_lock);
1047 retval = __videobuf_read_start(q);
1054 /* get / wait for data */
1055 if (NULL == q->read_buf) {
1056 q->read_buf = list_entry(q->stream.next,
1057 struct videobuf_buffer,
1059 list_del(&q->read_buf->stream);
1062 rc = videobuf_waiton(q->read_buf, nonblocking, 1);
1069 if (q->read_buf->state == VIDEOBUF_DONE) {
1070 rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
1071 retval, vbihack, nonblocking);
1081 q->read_off = q->read_buf->size;
1086 /* requeue buffer when done with copying */
1087 if (q->read_off == q->read_buf->size) {
1088 list_add_tail(&q->read_buf->stream,
1090 spin_lock_irqsave(q->irqlock, flags);
1091 q->ops->buf_queue(q, q->read_buf);
1092 spin_unlock_irqrestore(q->irqlock, flags);
1100 mutex_unlock(&q->vb_lock);
1103 EXPORT_SYMBOL_GPL(videobuf_read_stream);
1105 unsigned int videobuf_poll_stream(struct file *file,
1106 struct videobuf_queue *q,
1109 struct videobuf_buffer *buf = NULL;
1110 unsigned int rc = 0;
1112 mutex_lock(&q->vb_lock);
1114 if (!list_empty(&q->stream))
1115 buf = list_entry(q->stream.next,
1116 struct videobuf_buffer, stream);
1119 __videobuf_read_start(q);
1122 } else if (NULL == q->read_buf) {
1123 q->read_buf = list_entry(q->stream.next,
1124 struct videobuf_buffer,
1126 list_del(&q->read_buf->stream);
1135 poll_wait(file, &buf->done, wait);
1136 if (buf->state == VIDEOBUF_DONE ||
1137 buf->state == VIDEOBUF_ERROR) {
1139 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1140 case V4L2_BUF_TYPE_VBI_OUTPUT:
1141 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1142 rc = POLLOUT | POLLWRNORM;
1145 rc = POLLIN | POLLRDNORM;
1150 mutex_unlock(&q->vb_lock);
1153 EXPORT_SYMBOL_GPL(videobuf_poll_stream);
1155 int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma)
1160 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1162 if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) {
1163 dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n");
1167 mutex_lock(&q->vb_lock);
1168 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1169 struct videobuf_buffer *buf = q->bufs[i];
1171 if (buf && buf->memory == V4L2_MEMORY_MMAP &&
1172 buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) {
1173 rc = CALL(q, mmap_mapper, q, buf, vma);
1177 mutex_unlock(&q->vb_lock);
1181 EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
1183 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1184 int videobuf_cgmbuf(struct videobuf_queue *q,
1185 struct video_mbuf *mbuf, int count)
1187 struct v4l2_requestbuffers req;
1190 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
1192 memset(&req, 0, sizeof(req));
1195 req.memory = V4L2_MEMORY_MMAP;
1196 rc = videobuf_reqbufs(q, &req);
1200 mbuf->frames = req.count;
1202 for (i = 0; i < mbuf->frames; i++) {
1203 mbuf->offsets[i] = q->bufs[i]->boff;
1204 mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize);
1209 EXPORT_SYMBOL_GPL(videobuf_cgmbuf);