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 #ifndef _VIDEOBUF_CORE_H
17 #define _VIDEOBUF_CORE_H
19 #include <linux/poll.h>
20 #ifdef CONFIG_VIDEO_V4L1_COMPAT
22 #include <linux/videodev.h>
24 #include <linux/videodev2.h>
29 struct videobuf_buffer;
30 struct videobuf_queue;
32 /* --------------------------------------------------------------------- */
35 * A small set of helper functions to manage video4linux buffers.
37 * struct videobuf_buffer holds the data structures used by the helper
38 * functions, additionally some commonly used fields for v4l buffers
39 * (width, height, lists, waitqueue) are in there. That struct should
40 * be used as first element in the drivers buffer struct.
42 * about the mmap helpers (videobuf_mmap_*):
44 * The mmaper function allows to map any subset of contingous buffers.
45 * This includes one mmap() call for all buffers (which the original
46 * video4linux API uses) as well as one mmap() for every single buffer
49 * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
50 * userspace address + size which can be feeded into the
51 * videobuf_dma_init_user function listed above.
55 struct videobuf_mapping {
57 struct videobuf_queue *q;
61 VIDEOBUF_NEEDS_INIT = 0,
62 VIDEOBUF_PREPARED = 1,
69 #ifdef CONFIG_VIDEO_RK29XX_VOUT
77 struct videobuf_buffer {
81 /* info about the buffer */
84 unsigned int bytesperline; /* use only if != 0 */
87 enum v4l2_field field;
88 enum videobuf_state state;
89 struct list_head stream; /* QBUF/DQBUF list */
91 /* touched by irq handler */
92 struct list_head queue;
93 wait_queue_head_t done;
94 unsigned int field_count;
98 enum v4l2_memory memory;
103 /* buffer offset (mmap + overlay) */
106 /* buffer addr (userland ptr!) */
109 /* for mmap'ed buffers */
110 struct videobuf_mapping *map;
112 /* Private pointer to allow specific methods to store their data */
114 #ifdef CONFIG_VIDEO_RK29XX_VOUT
115 struct rk29_vaddr vaddr;
120 struct videobuf_queue_ops {
121 int (*buf_setup)(struct videobuf_queue *q,
122 unsigned int *count, unsigned int *size);
123 int (*buf_prepare)(struct videobuf_queue *q,
124 struct videobuf_buffer *vb,
125 enum v4l2_field field);
126 void (*buf_queue)(struct videobuf_queue *q,
127 struct videobuf_buffer *vb);
128 void (*buf_release)(struct videobuf_queue *q,
129 struct videobuf_buffer *vb);
132 #define MAGIC_QTYPE_OPS 0x12261003
134 /* Helper operations - device type dependent */
135 struct videobuf_qtype_ops {
138 struct videobuf_buffer *(*alloc_vb)(size_t size);
139 void *(*vaddr) (struct videobuf_buffer *buf);
140 int (*iolock) (struct videobuf_queue *q,
141 struct videobuf_buffer *vb,
142 struct v4l2_framebuffer *fbuf);
143 int (*sync) (struct videobuf_queue *q,
144 struct videobuf_buffer *buf);
145 int (*mmap_mapper) (struct videobuf_queue *q,
146 struct videobuf_buffer *buf,
147 struct vm_area_struct *vma);
150 struct videobuf_queue {
151 struct mutex vb_lock;
155 wait_queue_head_t wait; /* wait if queue is empty */
157 enum v4l2_buf_type type;
158 unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
160 enum v4l2_field field;
161 enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
162 struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
163 const struct videobuf_queue_ops *ops;
164 struct videobuf_qtype_ops *int_ops;
166 unsigned int streaming:1;
167 unsigned int reading:1;
169 /* capture via mmap() + ioctl(QBUF/DQBUF) */
170 struct list_head stream;
172 /* capture via read() */
173 unsigned int read_off;
174 struct videobuf_buffer *read_buf;
176 /* driver private data */
180 int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
181 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
182 struct v4l2_framebuffer *fbuf);
184 struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q);
186 /* Used on videobuf-dvb */
187 void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
188 struct videobuf_buffer *buf);
190 void videobuf_queue_core_init(struct videobuf_queue *q,
191 const struct videobuf_queue_ops *ops,
194 enum v4l2_buf_type type,
195 enum v4l2_field field,
198 struct videobuf_qtype_ops *int_ops);
199 int videobuf_queue_is_busy(struct videobuf_queue *q);
200 void videobuf_queue_cancel(struct videobuf_queue *q);
202 enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
203 int videobuf_reqbufs(struct videobuf_queue *q,
204 struct v4l2_requestbuffers *req);
205 int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
206 int videobuf_qbuf(struct videobuf_queue *q,
207 struct v4l2_buffer *b);
208 int videobuf_dqbuf(struct videobuf_queue *q,
209 struct v4l2_buffer *b, int nonblocking);
210 #ifdef CONFIG_VIDEO_V4L1_COMPAT
211 int videobuf_cgmbuf(struct videobuf_queue *q,
212 struct video_mbuf *mbuf, int count);
214 int videobuf_streamon(struct videobuf_queue *q);
215 int videobuf_streamoff(struct videobuf_queue *q);
217 void videobuf_stop(struct videobuf_queue *q);
219 int videobuf_read_start(struct videobuf_queue *q);
220 void videobuf_read_stop(struct videobuf_queue *q);
221 ssize_t videobuf_read_stream(struct videobuf_queue *q,
222 char __user *data, size_t count, loff_t *ppos,
223 int vbihack, int nonblocking);
224 ssize_t videobuf_read_one(struct videobuf_queue *q,
225 char __user *data, size_t count, loff_t *ppos,
227 unsigned int videobuf_poll_stream(struct file *file,
228 struct videobuf_queue *q,
231 int videobuf_mmap_setup(struct videobuf_queue *q,
232 unsigned int bcount, unsigned int bsize,
233 enum v4l2_memory memory);
234 int __videobuf_mmap_setup(struct videobuf_queue *q,
235 unsigned int bcount, unsigned int bsize,
236 enum v4l2_memory memory);
237 int videobuf_mmap_free(struct videobuf_queue *q);
238 int videobuf_mmap_mapper(struct videobuf_queue *q,
239 struct vm_area_struct *vma);