2 * videobuf2-v4l2.c - V4L2 driver helper framework
4 * Copyright (C) 2010 Samsung Electronics
6 * Author: Pawel Osciak <pawel@osciak.com>
7 * Marek Szyprowski <m.szyprowski@samsung.com>
9 * The vb2_thread implementation was based on code from videobuf-dvb.c:
10 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation.
17 #include <linux/err.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
21 #include <linux/poll.h>
22 #include <linux/slab.h>
23 #include <linux/sched.h>
24 #include <linux/freezer.h>
25 #include <linux/kthread.h>
27 #include <media/v4l2-dev.h>
28 #include <media/v4l2-fh.h>
29 #include <media/v4l2-event.h>
30 #include <media/v4l2-common.h>
32 #include <media/videobuf2-v4l2.h>
35 module_param(debug, int, 0644);
37 #define dprintk(level, fmt, arg...) \
40 pr_info("vb2-v4l2: %s: " fmt, __func__, ## arg); \
43 /* Flags that are set by the vb2 core */
44 #define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
45 V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
46 V4L2_BUF_FLAG_PREPARED | \
47 V4L2_BUF_FLAG_TIMESTAMP_MASK)
48 /* Output buffer flags that should be passed on to the driver */
49 #define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
50 V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
53 * __verify_planes_array() - verify that the planes array passed in struct
54 * v4l2_buffer from userspace can be safely used
56 static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
58 if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
61 /* Is memory for copying plane information present? */
62 if (b->m.planes == NULL) {
63 dprintk(1, "multi-planar buffer passed but planes array not provided\n");
67 if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) {
68 dprintk(1, "incorrect planes array length, expected %d, got %d\n",
69 vb->num_planes, b->length);
76 static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
78 return __verify_planes_array(vb, pb);
82 * __verify_length() - Verify that the bytesused value for each plane fits in
83 * the plane length and that the data offset doesn't exceed the bytesused value.
85 static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
88 unsigned int bytesused;
91 if (!V4L2_TYPE_IS_OUTPUT(b->type))
94 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
95 for (plane = 0; plane < vb->num_planes; ++plane) {
96 length = (b->memory == VB2_MEMORY_USERPTR ||
97 b->memory == VB2_MEMORY_DMABUF)
98 ? b->m.planes[plane].length
99 : vb->planes[plane].length;
100 bytesused = b->m.planes[plane].bytesused
101 ? b->m.planes[plane].bytesused : length;
103 if (b->m.planes[plane].bytesused > length)
106 if (b->m.planes[plane].data_offset > 0 &&
107 b->m.planes[plane].data_offset >= bytesused)
111 length = (b->memory == VB2_MEMORY_USERPTR)
112 ? b->length : vb->planes[0].length;
114 if (b->bytesused > length)
121 static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
123 const struct v4l2_buffer *b = pb;
124 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
125 struct vb2_queue *q = vb->vb2_queue;
129 * For output buffers copy the timestamp if needed,
130 * and the timecode field and flag if needed.
132 if (q->copy_timestamp)
133 vb->timestamp = timeval_to_ns(&b->timestamp);
134 vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
135 if (b->flags & V4L2_BUF_FLAG_TIMECODE)
136 vbuf->timecode = b->timecode;
140 static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
142 static bool check_once;
150 pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
151 if (vb->vb2_queue->allow_zero_bytesused)
152 pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
154 pr_warn("use the actual size instead.\n");
157 static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
160 if (b->type != q->type) {
161 dprintk(1, "%s: invalid buffer type\n", opname);
165 if (b->index >= q->num_buffers) {
166 dprintk(1, "%s: buffer index out of range\n", opname);
170 if (q->bufs[b->index] == NULL) {
171 /* Should never happen */
172 dprintk(1, "%s: buffer is NULL\n", opname);
176 if (b->memory != q->memory) {
177 dprintk(1, "%s: invalid memory type\n", opname);
181 return __verify_planes_array(q->bufs[b->index], b);
185 * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
186 * returned to userspace
188 static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
190 struct v4l2_buffer *b = pb;
191 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
192 struct vb2_queue *q = vb->vb2_queue;
195 /* Copy back data such as timestamp, flags, etc. */
196 b->index = vb->index;
198 b->memory = vb->memory;
201 b->flags = vbuf->flags;
202 b->field = vbuf->field;
203 b->timestamp = ns_to_timeval(vb->timestamp);
204 b->timecode = vbuf->timecode;
205 b->sequence = vbuf->sequence;
209 if (q->is_multiplanar) {
211 * Fill in plane-related data if userspace provided an array
212 * for it. The caller has already verified memory and size.
214 b->length = vb->num_planes;
215 for (plane = 0; plane < vb->num_planes; ++plane) {
216 struct v4l2_plane *pdst = &b->m.planes[plane];
217 struct vb2_plane *psrc = &vb->planes[plane];
219 pdst->bytesused = psrc->bytesused;
220 pdst->length = psrc->length;
221 if (q->memory == VB2_MEMORY_MMAP)
222 pdst->m.mem_offset = psrc->m.offset;
223 else if (q->memory == VB2_MEMORY_USERPTR)
224 pdst->m.userptr = psrc->m.userptr;
225 else if (q->memory == VB2_MEMORY_DMABUF)
226 pdst->m.fd = psrc->m.fd;
227 pdst->data_offset = psrc->data_offset;
228 memset(pdst->reserved, 0, sizeof(pdst->reserved));
232 * We use length and offset in v4l2_planes array even for
233 * single-planar buffers, but userspace does not.
235 b->length = vb->planes[0].length;
236 b->bytesused = vb->planes[0].bytesused;
237 if (q->memory == VB2_MEMORY_MMAP)
238 b->m.offset = vb->planes[0].m.offset;
239 else if (q->memory == VB2_MEMORY_USERPTR)
240 b->m.userptr = vb->planes[0].m.userptr;
241 else if (q->memory == VB2_MEMORY_DMABUF)
242 b->m.fd = vb->planes[0].m.fd;
246 * Clear any buffer state related flags.
248 b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
249 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
250 if (!q->copy_timestamp) {
252 * For non-COPY timestamps, drop timestamp source bits
253 * and obtain the timestamp source from the queue.
255 b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
256 b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
260 case VB2_BUF_STATE_QUEUED:
261 case VB2_BUF_STATE_ACTIVE:
262 b->flags |= V4L2_BUF_FLAG_QUEUED;
264 case VB2_BUF_STATE_ERROR:
265 b->flags |= V4L2_BUF_FLAG_ERROR;
267 case VB2_BUF_STATE_DONE:
268 b->flags |= V4L2_BUF_FLAG_DONE;
270 case VB2_BUF_STATE_PREPARED:
271 b->flags |= V4L2_BUF_FLAG_PREPARED;
273 case VB2_BUF_STATE_PREPARING:
274 case VB2_BUF_STATE_DEQUEUED:
275 case VB2_BUF_STATE_REQUEUEING:
280 if (vb2_buffer_in_use(q, vb))
281 b->flags |= V4L2_BUF_FLAG_MAPPED;
284 b->flags & V4L2_BUF_FLAG_DONE &&
285 b->flags & V4L2_BUF_FLAG_LAST)
286 q->last_buffer_dequeued = true;
290 * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
291 * v4l2_buffer by the userspace. It also verifies that struct
292 * v4l2_buffer has a valid number of planes.
294 static int __fill_vb2_buffer(struct vb2_buffer *vb,
295 const void *pb, struct vb2_plane *planes)
297 struct vb2_queue *q = vb->vb2_queue;
298 const struct v4l2_buffer *b = pb;
299 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
303 ret = __verify_length(vb, b);
305 dprintk(1, "plane parameters verification failed: %d\n", ret);
308 if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) {
310 * If the format's field is ALTERNATE, then the buffer's field
311 * should be either TOP or BOTTOM, not ALTERNATE since that
312 * makes no sense. The driver has to know whether the
313 * buffer represents a top or a bottom field in order to
314 * program any DMA correctly. Using ALTERNATE is wrong, since
315 * that just says that it is either a top or a bottom field,
316 * but not which of the two it is.
318 dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n");
324 if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
325 if (b->memory == VB2_MEMORY_USERPTR) {
326 for (plane = 0; plane < vb->num_planes; ++plane) {
327 planes[plane].m.userptr =
328 b->m.planes[plane].m.userptr;
329 planes[plane].length =
330 b->m.planes[plane].length;
333 if (b->memory == VB2_MEMORY_DMABUF) {
334 for (plane = 0; plane < vb->num_planes; ++plane) {
336 b->m.planes[plane].m.fd;
337 planes[plane].length =
338 b->m.planes[plane].length;
342 /* Fill in driver-provided information for OUTPUT types */
343 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
345 * Will have to go up to b->length when API starts
346 * accepting variable number of planes.
348 * If bytesused == 0 for the output buffer, then fall
349 * back to the full buffer size. In that case
350 * userspace clearly never bothered to set it and
351 * it's a safe assumption that they really meant to
352 * use the full plane sizes.
354 * Some drivers, e.g. old codec drivers, use bytesused == 0
355 * as a way to indicate that streaming is finished.
356 * In that case, the driver should use the
357 * allow_zero_bytesused flag to keep old userspace
358 * applications working.
360 for (plane = 0; plane < vb->num_planes; ++plane) {
361 struct vb2_plane *pdst = &planes[plane];
362 struct v4l2_plane *psrc = &b->m.planes[plane];
364 if (psrc->bytesused == 0)
365 vb2_warn_zero_bytesused(vb);
367 if (vb->vb2_queue->allow_zero_bytesused)
368 pdst->bytesused = psrc->bytesused;
370 pdst->bytesused = psrc->bytesused ?
371 psrc->bytesused : pdst->length;
372 pdst->data_offset = psrc->data_offset;
377 * Single-planar buffers do not use planes array,
378 * so fill in relevant v4l2_buffer struct fields instead.
379 * In videobuf we use our internal V4l2_planes struct for
380 * single-planar buffers as well, for simplicity.
382 * If bytesused == 0 for the output buffer, then fall back
383 * to the full buffer size as that's a sensible default.
385 * Some drivers, e.g. old codec drivers, use bytesused == 0 as
386 * a way to indicate that streaming is finished. In that case,
387 * the driver should use the allow_zero_bytesused flag to keep
388 * old userspace applications working.
390 if (b->memory == VB2_MEMORY_USERPTR) {
391 planes[0].m.userptr = b->m.userptr;
392 planes[0].length = b->length;
395 if (b->memory == VB2_MEMORY_DMABUF) {
396 planes[0].m.fd = b->m.fd;
397 planes[0].length = b->length;
400 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
401 if (b->bytesused == 0)
402 vb2_warn_zero_bytesused(vb);
404 if (vb->vb2_queue->allow_zero_bytesused)
405 planes[0].bytesused = b->bytesused;
407 planes[0].bytesused = b->bytesused ?
408 b->bytesused : planes[0].length;
410 planes[0].bytesused = 0;
414 /* Zero flags that the vb2 core handles */
415 vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
416 if (!vb->vb2_queue->copy_timestamp || !V4L2_TYPE_IS_OUTPUT(b->type)) {
418 * Non-COPY timestamps and non-OUTPUT queues will get
419 * their timestamp and timestamp source flags from the
422 vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
425 if (V4L2_TYPE_IS_OUTPUT(b->type)) {
427 * For output buffers mask out the timecode flag:
428 * this will be handled later in vb2_qbuf().
429 * The 'field' is valid metadata for this output buffer
430 * and so that needs to be copied here.
432 vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
433 vbuf->field = b->field;
435 /* Zero any output buffer flags as this is a capture buffer */
436 vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
442 static const struct vb2_buf_ops v4l2_buf_ops = {
443 .verify_planes_array = __verify_planes_array_core,
444 .fill_user_buffer = __fill_v4l2_buffer,
445 .fill_vb2_buffer = __fill_vb2_buffer,
446 .copy_timestamp = __copy_timestamp,
450 * vb2_querybuf() - query video buffer information
452 * @b: buffer struct passed from userspace to vidioc_querybuf handler
455 * Should be called from vidioc_querybuf ioctl handler in driver.
456 * This function will verify the passed v4l2_buffer structure and fill the
457 * relevant information for the userspace.
459 * The return values from this function are intended to be directly returned
460 * from vidioc_querybuf handler in driver.
462 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
464 struct vb2_buffer *vb;
467 if (b->type != q->type) {
468 dprintk(1, "wrong buffer type\n");
472 if (b->index >= q->num_buffers) {
473 dprintk(1, "buffer index out of range\n");
476 vb = q->bufs[b->index];
477 ret = __verify_planes_array(vb, b);
479 vb2_core_querybuf(q, b->index, b);
482 EXPORT_SYMBOL(vb2_querybuf);
484 int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
486 int ret = vb2_verify_memory_type(q, req->memory, req->type);
488 return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count);
490 EXPORT_SYMBOL_GPL(vb2_reqbufs);
492 int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
496 if (vb2_fileio_is_active(q)) {
497 dprintk(1, "file io in progress\n");
501 ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
503 return ret ? ret : vb2_core_prepare_buf(q, b->index, b);
505 EXPORT_SYMBOL_GPL(vb2_prepare_buf);
507 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
509 unsigned requested_planes = 1;
510 unsigned requested_sizes[VIDEO_MAX_PLANES];
511 struct v4l2_format *f = &create->format;
512 int ret = vb2_verify_memory_type(q, create->memory, f->type);
515 create->index = q->num_buffers;
516 if (create->count == 0)
517 return ret != -EBUSY ? ret : 0;
520 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
521 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
522 requested_planes = f->fmt.pix_mp.num_planes;
523 if (requested_planes == 0 ||
524 requested_planes > VIDEO_MAX_PLANES)
526 for (i = 0; i < requested_planes; i++)
528 f->fmt.pix_mp.plane_fmt[i].sizeimage;
530 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
531 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
532 requested_sizes[0] = f->fmt.pix.sizeimage;
534 case V4L2_BUF_TYPE_VBI_CAPTURE:
535 case V4L2_BUF_TYPE_VBI_OUTPUT:
536 requested_sizes[0] = f->fmt.vbi.samples_per_line *
537 (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]);
539 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
540 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
541 requested_sizes[0] = f->fmt.sliced.io_size;
543 case V4L2_BUF_TYPE_SDR_CAPTURE:
544 case V4L2_BUF_TYPE_SDR_OUTPUT:
545 requested_sizes[0] = f->fmt.sdr.buffersize;
547 case V4L2_BUF_TYPE_META_CAPTURE:
548 requested_sizes[0] = f->fmt.meta.buffersize;
553 for (i = 0; i < requested_planes; i++)
554 if (requested_sizes[i] == 0)
556 return ret ? ret : vb2_core_create_bufs(q, create->memory,
557 &create->count, requested_planes, requested_sizes);
559 EXPORT_SYMBOL_GPL(vb2_create_bufs);
561 int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
565 if (vb2_fileio_is_active(q)) {
566 dprintk(1, "file io in progress\n");
570 ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
571 return ret ? ret : vb2_core_qbuf(q, b->index, b);
573 EXPORT_SYMBOL_GPL(vb2_qbuf);
575 int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
579 if (vb2_fileio_is_active(q)) {
580 dprintk(1, "file io in progress\n");
584 if (b->type != q->type) {
585 dprintk(1, "invalid buffer type\n");
589 ret = vb2_core_dqbuf(q, NULL, b, nonblocking);
592 * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be
595 b->flags &= ~V4L2_BUF_FLAG_DONE;
599 EXPORT_SYMBOL_GPL(vb2_dqbuf);
601 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
603 if (vb2_fileio_is_active(q)) {
604 dprintk(1, "file io in progress\n");
607 return vb2_core_streamon(q, type);
609 EXPORT_SYMBOL_GPL(vb2_streamon);
611 int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
613 if (vb2_fileio_is_active(q)) {
614 dprintk(1, "file io in progress\n");
617 return vb2_core_streamoff(q, type);
619 EXPORT_SYMBOL_GPL(vb2_streamoff);
621 int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)
623 return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index,
624 eb->plane, eb->flags);
626 EXPORT_SYMBOL_GPL(vb2_expbuf);
628 int vb2_queue_init(struct vb2_queue *q)
634 WARN_ON(q->timestamp_flags &
635 ~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
636 V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
639 /* Warn that the driver should choose an appropriate timestamp type */
640 WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
641 V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
643 /* Warn that vb2_memory should match with v4l2_memory */
644 if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP)
645 || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR)
646 || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF))
649 if (q->buf_struct_size == 0)
650 q->buf_struct_size = sizeof(struct vb2_v4l2_buffer);
652 q->buf_ops = &v4l2_buf_ops;
653 q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
654 q->is_output = V4L2_TYPE_IS_OUTPUT(q->type);
655 q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK)
656 == V4L2_BUF_FLAG_TIMESTAMP_COPY;
658 * For compatibility with vb1: if QBUF hasn't been called yet, then
659 * return POLLERR as well. This only affects capture queues, output
660 * queues will always initialize waiting_for_buffers to false.
662 q->quirk_poll_must_check_waiting_for_buffers = true;
664 return vb2_core_queue_init(q);
666 EXPORT_SYMBOL_GPL(vb2_queue_init);
668 void vb2_queue_release(struct vb2_queue *q)
670 vb2_core_queue_release(q);
672 EXPORT_SYMBOL_GPL(vb2_queue_release);
674 unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
676 struct video_device *vfd = video_devdata(file);
677 unsigned long req_events = poll_requested_events(wait);
678 unsigned int res = 0;
680 if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
681 struct v4l2_fh *fh = file->private_data;
683 if (v4l2_event_pending(fh))
685 else if (req_events & POLLPRI)
686 poll_wait(file, &fh->wait, wait);
689 return res | vb2_core_poll(q, file, wait);
691 EXPORT_SYMBOL_GPL(vb2_poll);
694 * The following functions are not part of the vb2 core API, but are helper
695 * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
696 * and struct vb2_ops.
697 * They contain boilerplate code that most if not all drivers have to do
698 * and so they simplify the driver code.
701 /* The queue is busy if there is a owner and you are not that owner. */
702 static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
704 return vdev->queue->owner && vdev->queue->owner != file->private_data;
707 /* vb2 ioctl helpers */
709 int vb2_ioctl_reqbufs(struct file *file, void *priv,
710 struct v4l2_requestbuffers *p)
712 struct video_device *vdev = video_devdata(file);
713 int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
717 if (vb2_queue_is_busy(vdev, file))
719 res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count);
720 /* If count == 0, then the owner has released all buffers and he
721 is no longer owner of the queue. Otherwise we have a new owner. */
723 vdev->queue->owner = p->count ? file->private_data : NULL;
726 EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
728 int vb2_ioctl_create_bufs(struct file *file, void *priv,
729 struct v4l2_create_buffers *p)
731 struct video_device *vdev = video_devdata(file);
732 int res = vb2_verify_memory_type(vdev->queue, p->memory,
735 p->index = vdev->queue->num_buffers;
737 * If count == 0, then just check if memory and type are valid.
738 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
741 return res != -EBUSY ? res : 0;
744 if (vb2_queue_is_busy(vdev, file))
747 res = vb2_create_bufs(vdev->queue, p);
749 vdev->queue->owner = file->private_data;
752 EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
754 int vb2_ioctl_prepare_buf(struct file *file, void *priv,
755 struct v4l2_buffer *p)
757 struct video_device *vdev = video_devdata(file);
759 if (vb2_queue_is_busy(vdev, file))
761 return vb2_prepare_buf(vdev->queue, p);
763 EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
765 int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
767 struct video_device *vdev = video_devdata(file);
769 /* No need to call vb2_queue_is_busy(), anyone can query buffers. */
770 return vb2_querybuf(vdev->queue, p);
772 EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
774 int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
776 struct video_device *vdev = video_devdata(file);
778 if (vb2_queue_is_busy(vdev, file))
780 return vb2_qbuf(vdev->queue, p);
782 EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
784 int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
786 struct video_device *vdev = video_devdata(file);
788 if (vb2_queue_is_busy(vdev, file))
790 return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
792 EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
794 int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
796 struct video_device *vdev = video_devdata(file);
798 if (vb2_queue_is_busy(vdev, file))
800 return vb2_streamon(vdev->queue, i);
802 EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
804 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
806 struct video_device *vdev = video_devdata(file);
808 if (vb2_queue_is_busy(vdev, file))
810 return vb2_streamoff(vdev->queue, i);
812 EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
814 int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
816 struct video_device *vdev = video_devdata(file);
818 if (vb2_queue_is_busy(vdev, file))
820 return vb2_expbuf(vdev->queue, p);
822 EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
824 /* v4l2_file_operations helpers */
826 int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
828 struct video_device *vdev = video_devdata(file);
830 return vb2_mmap(vdev->queue, vma);
832 EXPORT_SYMBOL_GPL(vb2_fop_mmap);
834 int _vb2_fop_release(struct file *file, struct mutex *lock)
836 struct video_device *vdev = video_devdata(file);
840 if (file->private_data == vdev->queue->owner) {
841 vb2_queue_release(vdev->queue);
842 vdev->queue->owner = NULL;
846 return v4l2_fh_release(file);
848 EXPORT_SYMBOL_GPL(_vb2_fop_release);
850 int vb2_fop_release(struct file *file)
852 struct video_device *vdev = video_devdata(file);
853 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
855 return _vb2_fop_release(file, lock);
857 EXPORT_SYMBOL_GPL(vb2_fop_release);
859 ssize_t vb2_fop_write(struct file *file, const char __user *buf,
860 size_t count, loff_t *ppos)
862 struct video_device *vdev = video_devdata(file);
863 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
866 if (!(vdev->queue->io_modes & VB2_WRITE))
868 if (lock && mutex_lock_interruptible(lock))
870 if (vb2_queue_is_busy(vdev, file))
872 err = vb2_write(vdev->queue, buf, count, ppos,
873 file->f_flags & O_NONBLOCK);
874 if (vdev->queue->fileio)
875 vdev->queue->owner = file->private_data;
881 EXPORT_SYMBOL_GPL(vb2_fop_write);
883 ssize_t vb2_fop_read(struct file *file, char __user *buf,
884 size_t count, loff_t *ppos)
886 struct video_device *vdev = video_devdata(file);
887 struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
890 if (!(vdev->queue->io_modes & VB2_READ))
892 if (lock && mutex_lock_interruptible(lock))
894 if (vb2_queue_is_busy(vdev, file))
896 err = vb2_read(vdev->queue, buf, count, ppos,
897 file->f_flags & O_NONBLOCK);
898 if (vdev->queue->fileio)
899 vdev->queue->owner = file->private_data;
905 EXPORT_SYMBOL_GPL(vb2_fop_read);
907 unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
909 struct video_device *vdev = video_devdata(file);
910 struct vb2_queue *q = vdev->queue;
911 struct mutex *lock = q->lock ? q->lock : vdev->lock;
916 * If this helper doesn't know how to lock, then you shouldn't be using
917 * it but you should write your own.
921 if (lock && mutex_lock_interruptible(lock))
926 res = vb2_poll(vdev->queue, file, wait);
928 /* If fileio was started, then we have a new queue owner. */
929 if (!fileio && q->fileio)
930 q->owner = file->private_data;
935 EXPORT_SYMBOL_GPL(vb2_fop_poll);
938 unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
939 unsigned long len, unsigned long pgoff, unsigned long flags)
941 struct video_device *vdev = video_devdata(file);
943 return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
945 EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
948 /* vb2_ops helpers. Only use if vq->lock is non-NULL. */
950 void vb2_ops_wait_prepare(struct vb2_queue *vq)
952 mutex_unlock(vq->lock);
954 EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
956 void vb2_ops_wait_finish(struct vb2_queue *vq)
958 mutex_lock(vq->lock);
960 EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
962 MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
963 MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
964 MODULE_LICENSE("GPL");