Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 1 | /* |
| 2 | * videobuf2-core.h - V4L2 driver helper framework |
| 3 | * |
| 4 | * Copyright (C) 2010 Samsung Electronics |
| 5 | * |
Pawel Osciak | 9507208 | 2011-03-13 15:23:32 -0300 | [diff] [blame] | 6 | * Author: Pawel Osciak <pawel@osciak.com> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation. |
| 11 | */ |
| 12 | #ifndef _MEDIA_VIDEOBUF2_CORE_H |
| 13 | #define _MEDIA_VIDEOBUF2_CORE_H |
| 14 | |
| 15 | #include <linux/mm_types.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include <linux/poll.h> |
| 18 | #include <linux/videodev2.h> |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 19 | #include <linux/dma-buf.h> |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 20 | |
| 21 | struct vb2_alloc_ctx; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 22 | struct vb2_fileio_data; |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 23 | struct vb2_threadio_data; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 24 | |
| 25 | /** |
| 26 | * struct vb2_mem_ops - memory handling/memory allocator operations |
| 27 | * @alloc: allocate video memory and, optionally, allocator private data, |
| 28 | * return NULL on failure or a pointer to allocator private, |
| 29 | * per-buffer data on success; the returned private structure |
| 30 | * will then be passed as buf_priv argument to other ops in this |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 31 | * structure. Additional gfp_flags to use when allocating the |
| 32 | * are also passed to this operation. These flags are from the |
| 33 | * gfp_flags field of vb2_queue. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 34 | * @put: inform the allocator that the buffer will no longer be used; |
| 35 | * usually will result in the allocator freeing the buffer (if |
| 36 | * no other users of this buffer are present); the buf_priv |
| 37 | * argument is the allocator private per-buffer structure |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 38 | * previously returned from the alloc callback. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 39 | * @get_userptr: acquire userspace memory for a hardware operation; used for |
| 40 | * USERPTR memory types; vaddr is the address passed to the |
| 41 | * videobuf layer when queuing a video buffer of USERPTR type; |
| 42 | * should return an allocator private per-buffer structure |
| 43 | * associated with the buffer on success, NULL on failure; |
| 44 | * the returned private structure will then be passed as buf_priv |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 45 | * argument to other ops in this structure. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 46 | * @put_userptr: inform the allocator that a USERPTR buffer will no longer |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 47 | * be used. |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 48 | * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation; |
| 49 | * used for DMABUF memory types; alloc_ctx is the alloc context |
| 50 | * dbuf is the shared dma_buf; returns NULL on failure; |
| 51 | * allocator private per-buffer structure on success; |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 52 | * this needs to be used for further accesses to the buffer. |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 53 | * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF |
| 54 | * buffer is no longer used; the buf_priv argument is the |
| 55 | * allocator private per-buffer structure previously returned |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 56 | * from the attach_dmabuf callback. |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 57 | * @map_dmabuf: request for access to the dmabuf from allocator; the allocator |
| 58 | * of dmabuf is informed that this driver is going to use the |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 59 | * dmabuf. |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 60 | * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 61 | * that this driver is done using the dmabuf for now. |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 62 | * @prepare: called every time the buffer is passed from userspace to the |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 63 | * driver, useful for cache synchronisation, optional. |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 64 | * @finish: called every time the buffer is passed back from the driver |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 65 | * to the userspace, also optional. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 66 | * @vaddr: return a kernel virtual address to a given memory buffer |
| 67 | * associated with the passed private structure or NULL if no |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 68 | * such mapping exists. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 69 | * @cookie: return allocator specific cookie for a given memory buffer |
| 70 | * associated with the passed private structure or NULL if not |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 71 | * available. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 72 | * @num_users: return the current number of users of a memory buffer; |
| 73 | * return 1 if the videobuf layer (or actually the driver using |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 74 | * it) is the only user. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 75 | * @mmap: setup a userspace mapping for a given memory buffer under |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 76 | * the provided virtual memory region. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 77 | * |
| 78 | * Required ops for USERPTR types: get_userptr, put_userptr. |
| 79 | * Required ops for MMAP types: alloc, put, num_users, mmap. |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 80 | * Required ops for read/write access types: alloc, put, num_users, vaddr. |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 81 | * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf, |
| 82 | * unmap_dmabuf. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 83 | */ |
| 84 | struct vb2_mem_ops { |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 85 | void *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t gfp_flags); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 86 | void (*put)(void *buf_priv); |
Philipp Zabel | ea3aba8 | 2013-05-21 05:11:35 -0300 | [diff] [blame] | 87 | struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 88 | |
| 89 | void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr, |
| 90 | unsigned long size, int write); |
| 91 | void (*put_userptr)(void *buf_priv); |
| 92 | |
Marek Szyprowski | 3e0c2f2 | 2012-06-14 10:37:43 -0300 | [diff] [blame] | 93 | void (*prepare)(void *buf_priv); |
| 94 | void (*finish)(void *buf_priv); |
| 95 | |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 96 | void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf, |
| 97 | unsigned long size, int write); |
| 98 | void (*detach_dmabuf)(void *buf_priv); |
| 99 | int (*map_dmabuf)(void *buf_priv); |
| 100 | void (*unmap_dmabuf)(void *buf_priv); |
| 101 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 102 | void *(*vaddr)(void *buf_priv); |
| 103 | void *(*cookie)(void *buf_priv); |
| 104 | |
| 105 | unsigned int (*num_users)(void *buf_priv); |
| 106 | |
| 107 | int (*mmap)(void *buf_priv, struct vm_area_struct *vma); |
| 108 | }; |
| 109 | |
| 110 | struct vb2_plane { |
| 111 | void *mem_priv; |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 112 | struct dma_buf *dbuf; |
| 113 | unsigned int dbuf_mapped; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 114 | }; |
| 115 | |
| 116 | /** |
| 117 | * enum vb2_io_modes - queue access methods |
| 118 | * @VB2_MMAP: driver supports MMAP with streaming API |
| 119 | * @VB2_USERPTR: driver supports USERPTR with streaming API |
| 120 | * @VB2_READ: driver supports read() style access |
| 121 | * @VB2_WRITE: driver supports write() style access |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 122 | * @VB2_DMABUF: driver supports DMABUF with streaming API |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 123 | */ |
| 124 | enum vb2_io_modes { |
| 125 | VB2_MMAP = (1 << 0), |
| 126 | VB2_USERPTR = (1 << 1), |
| 127 | VB2_READ = (1 << 2), |
| 128 | VB2_WRITE = (1 << 3), |
Sumit Semwal | c538404 | 2012-06-14 10:37:37 -0300 | [diff] [blame] | 129 | VB2_DMABUF = (1 << 4), |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 130 | }; |
| 131 | |
| 132 | /** |
| 133 | * enum vb2_fileio_flags - flags for selecting a mode of the file io emulator, |
| 134 | * by default the 'streaming' style is used by the file io emulator |
| 135 | * @VB2_FILEIO_READ_ONCE: report EOF after reading the first buffer |
| 136 | * @VB2_FILEIO_WRITE_IMMEDIATELY: queue buffer after each write() call |
| 137 | */ |
| 138 | enum vb2_fileio_flags { |
| 139 | VB2_FILEIO_READ_ONCE = (1 << 0), |
| 140 | VB2_FILEIO_WRITE_IMMEDIATELY = (1 << 1), |
| 141 | }; |
| 142 | |
| 143 | /** |
| 144 | * enum vb2_buffer_state - current video buffer state |
| 145 | * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 146 | * @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 147 | * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 148 | * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver |
| 149 | * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used |
| 150 | * in a hardware operation |
| 151 | * @VB2_BUF_STATE_DONE: buffer returned from driver to videobuf, but |
| 152 | * not yet dequeued to userspace |
| 153 | * @VB2_BUF_STATE_ERROR: same as above, but the operation on the buffer |
| 154 | * has ended with an error, which will be reported |
| 155 | * to the userspace when it is dequeued |
| 156 | */ |
| 157 | enum vb2_buffer_state { |
| 158 | VB2_BUF_STATE_DEQUEUED, |
Hans Verkuil | b18a8ff | 2013-12-13 13:13:38 -0300 | [diff] [blame] | 159 | VB2_BUF_STATE_PREPARING, |
Guennadi Liakhovetski | ebc087d | 2011-08-31 06:51:10 -0300 | [diff] [blame] | 160 | VB2_BUF_STATE_PREPARED, |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 161 | VB2_BUF_STATE_QUEUED, |
| 162 | VB2_BUF_STATE_ACTIVE, |
| 163 | VB2_BUF_STATE_DONE, |
| 164 | VB2_BUF_STATE_ERROR, |
| 165 | }; |
| 166 | |
| 167 | struct vb2_queue; |
| 168 | |
| 169 | /** |
| 170 | * struct vb2_buffer - represents a video buffer |
| 171 | * @v4l2_buf: struct v4l2_buffer associated with this buffer; can |
| 172 | * be read by the driver and relevant entries can be |
| 173 | * changed by the driver in case of CAPTURE types |
| 174 | * (such as timestamp) |
| 175 | * @v4l2_planes: struct v4l2_planes associated with this buffer; can |
| 176 | * be read by the driver and relevant entries can be |
| 177 | * changed by the driver in case of CAPTURE types |
| 178 | * (such as bytesused); NOTE that even for single-planar |
| 179 | * types, the v4l2_planes[0] struct should be used |
| 180 | * instead of v4l2_buf for filling bytesused - drivers |
| 181 | * should use the vb2_set_plane_payload() function for that |
| 182 | * @vb2_queue: the queue to which this driver belongs |
| 183 | * @num_planes: number of planes in the buffer |
| 184 | * on an internal driver queue |
| 185 | * @state: current buffer state; do not change |
| 186 | * @queued_entry: entry on the queued buffers list, which holds all |
| 187 | * buffers queued from userspace |
| 188 | * @done_entry: entry on the list that stores all buffers ready to |
| 189 | * be dequeued to userspace |
| 190 | * @planes: private per-plane information; do not change |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 191 | */ |
| 192 | struct vb2_buffer { |
| 193 | struct v4l2_buffer v4l2_buf; |
| 194 | struct v4l2_plane v4l2_planes[VIDEO_MAX_PLANES]; |
| 195 | |
| 196 | struct vb2_queue *vb2_queue; |
| 197 | |
| 198 | unsigned int num_planes; |
| 199 | |
| 200 | /* Private: internal use only */ |
| 201 | enum vb2_buffer_state state; |
| 202 | |
| 203 | struct list_head queued_entry; |
| 204 | struct list_head done_entry; |
| 205 | |
| 206 | struct vb2_plane planes[VIDEO_MAX_PLANES]; |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 207 | |
| 208 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 209 | /* |
| 210 | * Counters for how often these buffer-related ops are |
| 211 | * called. Used to check for unbalanced ops. |
| 212 | */ |
| 213 | u32 cnt_mem_alloc; |
| 214 | u32 cnt_mem_put; |
| 215 | u32 cnt_mem_get_dmabuf; |
| 216 | u32 cnt_mem_get_userptr; |
| 217 | u32 cnt_mem_put_userptr; |
| 218 | u32 cnt_mem_prepare; |
| 219 | u32 cnt_mem_finish; |
| 220 | u32 cnt_mem_attach_dmabuf; |
| 221 | u32 cnt_mem_detach_dmabuf; |
| 222 | u32 cnt_mem_map_dmabuf; |
| 223 | u32 cnt_mem_unmap_dmabuf; |
| 224 | u32 cnt_mem_vaddr; |
| 225 | u32 cnt_mem_cookie; |
| 226 | u32 cnt_mem_num_users; |
| 227 | u32 cnt_mem_mmap; |
| 228 | |
| 229 | u32 cnt_buf_init; |
| 230 | u32 cnt_buf_prepare; |
| 231 | u32 cnt_buf_finish; |
| 232 | u32 cnt_buf_cleanup; |
| 233 | u32 cnt_buf_queue; |
| 234 | |
| 235 | /* This counts the number of calls to vb2_buffer_done() */ |
| 236 | u32 cnt_buf_done; |
| 237 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 238 | }; |
| 239 | |
| 240 | /** |
| 241 | * struct vb2_ops - driver-specific callbacks |
| 242 | * |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 243 | * @queue_setup: called from VIDIOC_REQBUFS and VIDIOC_CREATE_BUFS |
| 244 | * handlers before memory allocation, or, if |
| 245 | * *num_planes != 0, after the allocation to verify a |
| 246 | * smaller number of buffers. Driver should return |
| 247 | * the required number of buffers in *num_buffers, the |
| 248 | * required number of planes per buffer in *num_planes; the |
| 249 | * size of each plane should be set in the sizes[] array |
| 250 | * and optional per-plane allocator specific context in the |
| 251 | * alloc_ctxs[] array. When called from VIDIOC_REQBUFS, |
| 252 | * fmt == NULL, the driver has to use the currently |
| 253 | * configured format and *num_buffers is the total number |
| 254 | * of buffers, that are being allocated. When called from |
| 255 | * VIDIOC_CREATE_BUFS, fmt != NULL and it describes the |
Laurent Pinchart | 5548a382 | 2013-08-01 21:44:38 -0300 | [diff] [blame] | 256 | * target frame format (if the format isn't valid the |
| 257 | * callback must return -EINVAL). In this case *num_buffers |
| 258 | * are being allocated additionally to q->num_buffers. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 259 | * @wait_prepare: release any locks taken while calling vb2 functions; |
| 260 | * it is called before an ioctl needs to wait for a new |
| 261 | * buffer to arrive; required to avoid a deadlock in |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 262 | * blocking access type. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 263 | * @wait_finish: reacquire all locks released in the previous callback; |
| 264 | * required to continue operation after sleeping while |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 265 | * waiting for a new buffer to arrive. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 266 | * @buf_init: called once after allocating a buffer (in MMAP case) |
| 267 | * or after acquiring a new USERPTR buffer; drivers may |
| 268 | * perform additional buffer-related initialization; |
| 269 | * initialization failure (return != 0) will prevent |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 270 | * queue setup from completing successfully; optional. |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 271 | * @buf_prepare: called every time the buffer is queued from userspace |
| 272 | * and from the VIDIOC_PREPARE_BUF ioctl; drivers may |
| 273 | * perform any initialization required before each hardware |
Laurent Pinchart | 5548a382 | 2013-08-01 21:44:38 -0300 | [diff] [blame] | 274 | * operation in this callback; drivers that support |
| 275 | * VIDIOC_CREATE_BUFS must also validate the buffer size; |
| 276 | * if an error is returned, the buffer will not be queued |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 277 | * in driver; optional. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 278 | * @buf_finish: called before every dequeue of the buffer back to |
| 279 | * userspace; drivers may perform any operations required |
Hans Verkuil | 9c0863b | 2014-03-04 07:34:49 -0300 | [diff] [blame] | 280 | * before userspace accesses the buffer; optional. The |
| 281 | * buffer state can be one of the following: DONE and |
| 282 | * ERROR occur while streaming is in progress, and the |
| 283 | * PREPARED state occurs when the queue has been canceled |
| 284 | * and all pending buffers are being returned to their |
| 285 | * default DEQUEUED state. Typically you only have to do |
| 286 | * something if the state is VB2_BUF_STATE_DONE, since in |
| 287 | * all other cases the buffer contents will be ignored |
| 288 | * anyway. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 289 | * @buf_cleanup: called once before the buffer is freed; drivers may |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 290 | * perform any additional cleanup; optional. |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 291 | * @start_streaming: called once to enter 'streaming' state; the driver may |
| 292 | * receive buffers with @buf_queue callback before |
| 293 | * @start_streaming is called; the driver gets the number |
| 294 | * of already queued buffers in count parameter; driver |
Hans Verkuil | 02f142e | 2013-12-13 13:13:42 -0300 | [diff] [blame] | 295 | * can return an error if hardware fails, in that case all |
| 296 | * buffers that have been already given by the @buf_queue |
| 297 | * callback are invalidated. |
| 298 | * If there were not enough queued buffers to start |
| 299 | * streaming, then this callback returns -ENOBUFS, and the |
| 300 | * vb2 core will retry calling @start_streaming when a new |
| 301 | * buffer is queued. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 302 | * @stop_streaming: called when 'streaming' state must be disabled; driver |
| 303 | * should stop any DMA transactions or wait until they |
| 304 | * finish and give back all buffers it got from buf_queue() |
| 305 | * callback; may use vb2_wait_for_all_buffers() function |
| 306 | * @buf_queue: passes buffer vb to the driver; driver may start |
| 307 | * hardware operation on this buffer; driver should give |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 308 | * the buffer back by calling vb2_buffer_done() function; |
| 309 | * it is allways called after calling STREAMON ioctl; |
| 310 | * might be called before start_streaming callback if user |
Hans Verkuil | 3f12e6b | 2014-02-28 12:25:28 -0300 | [diff] [blame] | 311 | * pre-queued buffers before calling STREAMON. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 312 | */ |
| 313 | struct vb2_ops { |
Guennadi Liakhovetski | fc714e70 | 2011-08-24 10:30:21 -0300 | [diff] [blame] | 314 | int (*queue_setup)(struct vb2_queue *q, const struct v4l2_format *fmt, |
| 315 | unsigned int *num_buffers, unsigned int *num_planes, |
| 316 | unsigned int sizes[], void *alloc_ctxs[]); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 317 | |
| 318 | void (*wait_prepare)(struct vb2_queue *q); |
| 319 | void (*wait_finish)(struct vb2_queue *q); |
| 320 | |
| 321 | int (*buf_init)(struct vb2_buffer *vb); |
| 322 | int (*buf_prepare)(struct vb2_buffer *vb); |
Hans Verkuil | 0647064 | 2014-03-04 07:27:13 -0300 | [diff] [blame] | 323 | void (*buf_finish)(struct vb2_buffer *vb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 324 | void (*buf_cleanup)(struct vb2_buffer *vb); |
| 325 | |
Marek Szyprowski | bd323e2 | 2011-08-29 08:51:49 -0300 | [diff] [blame] | 326 | int (*start_streaming)(struct vb2_queue *q, unsigned int count); |
Hans Verkuil | e37559b | 2014-04-17 02:47:21 -0300 | [diff] [blame] | 327 | void (*stop_streaming)(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 328 | |
| 329 | void (*buf_queue)(struct vb2_buffer *vb); |
| 330 | }; |
| 331 | |
Hans Verkuil | 5a5adf6 | 2012-06-22 07:29:35 -0300 | [diff] [blame] | 332 | struct v4l2_fh; |
| 333 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 334 | /** |
| 335 | * struct vb2_queue - a videobuf queue |
| 336 | * |
| 337 | * @type: queue type (see V4L2_BUF_TYPE_* in linux/videodev2.h |
| 338 | * @io_modes: supported io methods (see vb2_io_modes enum) |
| 339 | * @io_flags: additional io flags (see vb2_fileio_flags enum) |
Hans Verkuil | 5a5adf6 | 2012-06-22 07:29:35 -0300 | [diff] [blame] | 340 | * @lock: pointer to a mutex that protects the vb2_queue struct. The |
| 341 | * driver can set this to a mutex to let the v4l2 core serialize |
| 342 | * the queuing ioctls. If the driver wants to handle locking |
| 343 | * itself, then this should be set to NULL. This lock is not used |
| 344 | * by the videobuf2 core API. |
| 345 | * @owner: The filehandle that 'owns' the buffers, i.e. the filehandle |
| 346 | * that called reqbufs, create_buffers or started fileio. |
| 347 | * This field is not used by the videobuf2 core API, but it allows |
| 348 | * drivers to easily associate an owner filehandle with the queue. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 349 | * @ops: driver-specific callbacks |
| 350 | * @mem_ops: memory allocator specific callbacks |
| 351 | * @drv_priv: driver private data |
| 352 | * @buf_struct_size: size of the driver-specific buffer structure; |
| 353 | * "0" indicates the driver doesn't want to use a custom buffer |
| 354 | * structure type, so sizeof(struct vb2_buffer) will is used |
Sakari Ailus | 872484c | 2013-08-25 17:57:03 -0300 | [diff] [blame] | 355 | * @timestamp_flags: Timestamp flags; V4L2_BUF_FLAGS_TIMESTAMP_* and |
| 356 | * V4L2_BUF_FLAGS_TSTAMP_SRC_* |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 357 | * @gfp_flags: additional gfp flags used when allocating the buffers. |
| 358 | * Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32 |
| 359 | * to force the buffer allocation to a specific memory zone. |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 360 | * @min_buffers_needed: the minimum number of buffers needed before |
| 361 | * start_streaming() can be called. Used when a DMA engine |
| 362 | * cannot be started unless at least this number of buffers |
| 363 | * have been queued into the driver. |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 364 | * |
| 365 | * @memory: current memory type used |
| 366 | * @bufs: videobuf buffer structures |
| 367 | * @num_buffers: number of allocated/used buffers |
| 368 | * @queued_list: list of buffers currently queued from userspace |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 369 | * @queued_count: number of buffers queued and ready for streaming. |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 370 | * @owned_by_drv_count: number of buffers owned by the driver |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 371 | * @done_list: list of buffers ready to be dequeued to userspace |
| 372 | * @done_lock: lock to protect done_list list |
| 373 | * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued |
| 374 | * @alloc_ctx: memory type/allocator-specific contexts for each plane |
| 375 | * @streaming: current streaming state |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 376 | * @start_streaming_called: start_streaming() was called successfully and we |
| 377 | * started streaming. |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame^] | 378 | * @error: a fatal error occurred on the queue |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 379 | * @fileio: file io emulator internal data, used only if emulator is active |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 380 | * @threadio: thread io internal data, used only if thread is active |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 381 | */ |
| 382 | struct vb2_queue { |
| 383 | enum v4l2_buf_type type; |
| 384 | unsigned int io_modes; |
| 385 | unsigned int io_flags; |
Hans Verkuil | 5a5adf6 | 2012-06-22 07:29:35 -0300 | [diff] [blame] | 386 | struct mutex *lock; |
| 387 | struct v4l2_fh *owner; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 388 | |
| 389 | const struct vb2_ops *ops; |
| 390 | const struct vb2_mem_ops *mem_ops; |
| 391 | void *drv_priv; |
| 392 | unsigned int buf_struct_size; |
Sakari Ailus | ade4868 | 2014-02-25 19:12:19 -0300 | [diff] [blame] | 393 | u32 timestamp_flags; |
Hans Verkuil | b6ba205 | 2013-03-01 15:44:20 -0300 | [diff] [blame] | 394 | gfp_t gfp_flags; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 395 | u32 min_buffers_needed; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 396 | |
| 397 | /* private: internal use only */ |
| 398 | enum v4l2_memory memory; |
| 399 | struct vb2_buffer *bufs[VIDEO_MAX_FRAME]; |
| 400 | unsigned int num_buffers; |
| 401 | |
| 402 | struct list_head queued_list; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 403 | unsigned int queued_count; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 404 | |
Hans Verkuil | 6ea3b98 | 2014-02-06 05:46:11 -0300 | [diff] [blame] | 405 | atomic_t owned_by_drv_count; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 406 | struct list_head done_list; |
| 407 | spinlock_t done_lock; |
| 408 | wait_queue_head_t done_wq; |
| 409 | |
| 410 | void *alloc_ctx[VIDEO_MAX_PLANES]; |
Marek Szyprowski | 035aa14 | 2011-08-24 06:43:36 -0300 | [diff] [blame] | 411 | unsigned int plane_sizes[VIDEO_MAX_PLANES]; |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 412 | |
| 413 | unsigned int streaming:1; |
Hans Verkuil | b3379c6 | 2014-02-24 13:51:03 -0300 | [diff] [blame] | 414 | unsigned int start_streaming_called:1; |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame^] | 415 | unsigned int error:1; |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 416 | |
| 417 | struct vb2_fileio_data *fileio; |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 418 | struct vb2_threadio_data *threadio; |
Hans Verkuil | b5b4541 | 2014-01-29 11:53:25 -0300 | [diff] [blame] | 419 | |
| 420 | #ifdef CONFIG_VIDEO_ADV_DEBUG |
| 421 | /* |
| 422 | * Counters for how often these queue-related ops are |
| 423 | * called. Used to check for unbalanced ops. |
| 424 | */ |
| 425 | u32 cnt_queue_setup; |
| 426 | u32 cnt_wait_prepare; |
| 427 | u32 cnt_wait_finish; |
| 428 | u32 cnt_start_streaming; |
| 429 | u32 cnt_stop_streaming; |
| 430 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 431 | }; |
| 432 | |
| 433 | void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no); |
| 434 | void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no); |
| 435 | |
| 436 | void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state); |
Laurent Pinchart | 34ea4d4 | 2014-03-09 21:42:52 -0300 | [diff] [blame] | 437 | void vb2_discard_done(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 438 | int vb2_wait_for_all_buffers(struct vb2_queue *q); |
| 439 | |
| 440 | int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b); |
| 441 | int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req); |
| 442 | |
Guennadi Liakhovetski | 2d86401 | 2011-09-28 09:23:02 -0300 | [diff] [blame] | 443 | int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create); |
| 444 | int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b); |
| 445 | |
Ezequiel Garcia | 896f38f | 2012-09-17 14:59:30 -0300 | [diff] [blame] | 446 | int __must_check vb2_queue_init(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 447 | |
| 448 | void vb2_queue_release(struct vb2_queue *q); |
Laurent Pinchart | 4bb7267 | 2014-06-03 18:53:25 -0300 | [diff] [blame^] | 449 | void vb2_queue_error(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 450 | |
| 451 | int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 452 | int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 453 | int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking); |
| 454 | |
| 455 | int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type); |
| 456 | int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type); |
| 457 | |
| 458 | int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma); |
Scott Jiang | 6f524ec | 2011-09-21 09:25:23 -0300 | [diff] [blame] | 459 | #ifndef CONFIG_MMU |
| 460 | unsigned long vb2_get_unmapped_area(struct vb2_queue *q, |
| 461 | unsigned long addr, |
| 462 | unsigned long len, |
| 463 | unsigned long pgoff, |
| 464 | unsigned long flags); |
| 465 | #endif |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 466 | unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait); |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 467 | size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count, |
| 468 | loff_t *ppos, int nonblock); |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 469 | size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count, |
Marek Szyprowski | b25748f | 2010-12-06 05:56:55 -0300 | [diff] [blame] | 470 | loff_t *ppos, int nonblock); |
Hans Verkuil | 3415a89 | 2014-04-14 07:33:00 -0300 | [diff] [blame] | 471 | /** |
| 472 | * vb2_thread_fnc - callback function for use with vb2_thread |
| 473 | * |
| 474 | * This is called whenever a buffer is dequeued in the thread. |
| 475 | */ |
| 476 | typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv); |
| 477 | |
| 478 | /** |
| 479 | * vb2_thread_start() - start a thread for the given queue. |
| 480 | * @q: videobuf queue |
| 481 | * @fnc: callback function |
| 482 | * @priv: priv pointer passed to the callback function |
| 483 | * @thread_name:the name of the thread. This will be prefixed with "vb2-". |
| 484 | * |
| 485 | * This starts a thread that will queue and dequeue until an error occurs |
| 486 | * or @vb2_thread_stop is called. |
| 487 | * |
| 488 | * This function should not be used for anything else but the videobuf2-dvb |
| 489 | * support. If you think you have another good use-case for this, then please |
| 490 | * contact the linux-media mailinglist first. |
| 491 | */ |
| 492 | int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv, |
| 493 | const char *thread_name); |
| 494 | |
| 495 | /** |
| 496 | * vb2_thread_stop() - stop the thread for the given queue. |
| 497 | * @q: videobuf queue |
| 498 | */ |
| 499 | int vb2_thread_stop(struct vb2_queue *q); |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 500 | |
| 501 | /** |
| 502 | * vb2_is_streaming() - return streaming status of the queue |
| 503 | * @q: videobuf queue |
| 504 | */ |
| 505 | static inline bool vb2_is_streaming(struct vb2_queue *q) |
| 506 | { |
| 507 | return q->streaming; |
| 508 | } |
| 509 | |
| 510 | /** |
Hans Verkuil | 74753cf | 2014-04-07 09:23:50 -0300 | [diff] [blame] | 511 | * vb2_fileio_is_active() - return true if fileio is active. |
| 512 | * @q: videobuf queue |
| 513 | * |
| 514 | * This returns true if read() or write() is used to stream the data |
| 515 | * as opposed to stream I/O. This is almost never an important distinction, |
| 516 | * except in rare cases. One such case is that using read() or write() to |
| 517 | * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there |
| 518 | * is no way you can pass the field information of each buffer to/from |
| 519 | * userspace. A driver that supports this field format should check for |
| 520 | * this in the queue_setup op and reject it if this function returns true. |
| 521 | */ |
| 522 | static inline bool vb2_fileio_is_active(struct vb2_queue *q) |
| 523 | { |
| 524 | return q->fileio; |
| 525 | } |
| 526 | |
| 527 | /** |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 528 | * vb2_is_busy() - return busy status of the queue |
| 529 | * @q: videobuf queue |
| 530 | * |
| 531 | * This function checks if queue has any buffers allocated. |
| 532 | */ |
| 533 | static inline bool vb2_is_busy(struct vb2_queue *q) |
| 534 | { |
| 535 | return (q->num_buffers > 0); |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * vb2_get_drv_priv() - return driver private data associated with the queue |
| 540 | * @q: videobuf queue |
| 541 | */ |
| 542 | static inline void *vb2_get_drv_priv(struct vb2_queue *q) |
| 543 | { |
| 544 | return q->drv_priv; |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * vb2_set_plane_payload() - set bytesused for the plane plane_no |
| 549 | * @vb: buffer for which plane payload should be set |
| 550 | * @plane_no: plane number for which payload should be set |
| 551 | * @size: payload in bytes |
| 552 | */ |
| 553 | static inline void vb2_set_plane_payload(struct vb2_buffer *vb, |
| 554 | unsigned int plane_no, unsigned long size) |
| 555 | { |
| 556 | if (plane_no < vb->num_planes) |
| 557 | vb->v4l2_planes[plane_no].bytesused = size; |
| 558 | } |
| 559 | |
| 560 | /** |
Laurent Pinchart | 9f00eda | 2011-02-27 14:38:19 -0300 | [diff] [blame] | 561 | * vb2_get_plane_payload() - get bytesused for the plane plane_no |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 562 | * @vb: buffer for which plane payload should be set |
| 563 | * @plane_no: plane number for which payload should be set |
| 564 | * @size: payload in bytes |
| 565 | */ |
| 566 | static inline unsigned long vb2_get_plane_payload(struct vb2_buffer *vb, |
| 567 | unsigned int plane_no) |
| 568 | { |
| 569 | if (plane_no < vb->num_planes) |
| 570 | return vb->v4l2_planes[plane_no].bytesused; |
| 571 | return 0; |
| 572 | } |
| 573 | |
| 574 | /** |
| 575 | * vb2_plane_size() - return plane size in bytes |
| 576 | * @vb: buffer for which plane size should be returned |
| 577 | * @plane_no: plane number for which size should be returned |
| 578 | */ |
| 579 | static inline unsigned long |
| 580 | vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no) |
| 581 | { |
| 582 | if (plane_no < vb->num_planes) |
| 583 | return vb->v4l2_planes[plane_no].length; |
| 584 | return 0; |
| 585 | } |
| 586 | |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 587 | /* |
| 588 | * The following functions are not part of the vb2 core API, but are simple |
| 589 | * helper functions that you can use in your struct v4l2_file_operations, |
| 590 | * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock |
| 591 | * or video_device->lock is set, and they will set and test vb2_queue->owner |
| 592 | * to check if the calling filehandle is permitted to do the queuing operation. |
| 593 | */ |
| 594 | |
| 595 | /* struct v4l2_ioctl_ops helpers */ |
| 596 | |
| 597 | int vb2_ioctl_reqbufs(struct file *file, void *priv, |
| 598 | struct v4l2_requestbuffers *p); |
| 599 | int vb2_ioctl_create_bufs(struct file *file, void *priv, |
| 600 | struct v4l2_create_buffers *p); |
| 601 | int vb2_ioctl_prepare_buf(struct file *file, void *priv, |
| 602 | struct v4l2_buffer *p); |
| 603 | int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p); |
| 604 | int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p); |
| 605 | int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p); |
| 606 | int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i); |
| 607 | int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i); |
Tomasz Stanislawski | 83ae7c5 | 2012-06-14 11:32:24 -0300 | [diff] [blame] | 608 | int vb2_ioctl_expbuf(struct file *file, void *priv, |
| 609 | struct v4l2_exportbuffer *p); |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 610 | |
| 611 | /* struct v4l2_file_operations helpers */ |
| 612 | |
| 613 | int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma); |
| 614 | int vb2_fop_release(struct file *file); |
Ricardo Ribalda | 1380f57 | 2013-11-25 05:49:02 -0300 | [diff] [blame] | 615 | int _vb2_fop_release(struct file *file, struct mutex *lock); |
Ricardo Ribalda | 819585b | 2013-08-28 04:39:29 -0300 | [diff] [blame] | 616 | ssize_t vb2_fop_write(struct file *file, const char __user *buf, |
Hans Verkuil | 4c1ffca | 2012-07-02 05:59:18 -0300 | [diff] [blame] | 617 | size_t count, loff_t *ppos); |
| 618 | ssize_t vb2_fop_read(struct file *file, char __user *buf, |
| 619 | size_t count, loff_t *ppos); |
| 620 | unsigned int vb2_fop_poll(struct file *file, poll_table *wait); |
| 621 | #ifndef CONFIG_MMU |
| 622 | unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr, |
| 623 | unsigned long len, unsigned long pgoff, unsigned long flags); |
| 624 | #endif |
| 625 | |
| 626 | /* struct vb2_ops helpers, only use if vq->lock is non-NULL. */ |
| 627 | |
| 628 | void vb2_ops_wait_prepare(struct vb2_queue *vq); |
| 629 | void vb2_ops_wait_finish(struct vb2_queue *vq); |
| 630 | |
Pawel Osciak | e23ccc0 | 2010-10-11 10:56:41 -0300 | [diff] [blame] | 631 | #endif /* _MEDIA_VIDEOBUF2_CORE_H */ |