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 #include <linux/videodev2.h>
25 struct videobuf_buffer;
26 struct videobuf_queue;
28 /* --------------------------------------------------------------------- */
31 * A small set of helper functions to manage video4linux buffers.
33 * struct videobuf_buffer holds the data structures used by the helper
34 * functions, additionally some commonly used fields for v4l buffers
35 * (width, height, lists, waitqueue) are in there. That struct should
36 * be used as first element in the drivers buffer struct.
38 * about the mmap helpers (videobuf_mmap_*):
40 * The mmaper function allows to map any subset of contingous buffers.
41 * This includes one mmap() call for all buffers (which the original
42 * video4linux API uses) as well as one mmap() for every single buffer
45 * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
46 * userspace address + size which can be feeded into the
47 * videobuf_dma_init_user function listed above.
51 struct videobuf_mapping {
53 struct videobuf_queue *q;
57 VIDEOBUF_NEEDS_INIT = 0,
58 VIDEOBUF_PREPARED = 1,
65 #ifdef CONFIG_VIDEO_RK29XX_VOUT
73 struct videobuf_buffer {
77 /* info about the buffer */
80 unsigned int bytesperline; /* use only if != 0 */
83 enum v4l2_field field;
84 enum videobuf_state state;
85 struct list_head stream; /* QBUF/DQBUF list */
87 /* touched by irq handler */
88 struct list_head queue;
89 wait_queue_head_t done;
90 unsigned int field_count;
94 enum v4l2_memory memory;
99 /* buffer offset (mmap + overlay) */
102 /* buffer addr (userland ptr!) */
105 /* for mmap'ed buffers */
106 struct videobuf_mapping *map;
108 /* Private pointer to allow specific methods to store their data */
110 #ifdef CONFIG_VIDEO_RK29XX_VOUT
111 struct rk29_vaddr vaddr;
116 struct videobuf_queue_ops {
117 int (*buf_setup)(struct videobuf_queue *q,
118 unsigned int *count, unsigned int *size);
119 int (*buf_prepare)(struct videobuf_queue *q,
120 struct videobuf_buffer *vb,
121 enum v4l2_field field);
122 void (*buf_queue)(struct videobuf_queue *q,
123 struct videobuf_buffer *vb);
124 void (*buf_release)(struct videobuf_queue *q,
125 struct videobuf_buffer *vb);
128 #define MAGIC_QTYPE_OPS 0x12261003
130 /* Helper operations - device type dependent */
131 struct videobuf_qtype_ops {
134 struct videobuf_buffer *(*alloc_vb)(size_t size);
135 void *(*vaddr) (struct videobuf_buffer *buf);
136 int (*iolock) (struct videobuf_queue *q,
137 struct videobuf_buffer *vb,
138 struct v4l2_framebuffer *fbuf);
139 int (*sync) (struct videobuf_queue *q,
140 struct videobuf_buffer *buf);
141 int (*mmap_mapper) (struct videobuf_queue *q,
142 struct videobuf_buffer *buf,
143 struct vm_area_struct *vma);
146 struct videobuf_queue {
147 struct mutex vb_lock;
148 struct mutex *ext_lock;
152 wait_queue_head_t wait; /* wait if queue is empty */
154 enum v4l2_buf_type type;
155 unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
157 enum v4l2_field field;
158 enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
159 struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
160 const struct videobuf_queue_ops *ops;
161 struct videobuf_qtype_ops *int_ops;
163 unsigned int streaming:1;
164 unsigned int reading:1;
166 /* capture via mmap() + ioctl(QBUF/DQBUF) */
167 struct list_head stream;
169 /* capture via read() */
170 unsigned int read_off;
171 struct videobuf_buffer *read_buf;
173 /* driver private data */
177 static inline void videobuf_queue_lock(struct videobuf_queue *q)
180 mutex_lock(&q->vb_lock);
183 static inline void videobuf_queue_unlock(struct videobuf_queue *q)
186 mutex_unlock(&q->vb_lock);
189 int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb,
190 int non_blocking, int intr);
191 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
192 struct v4l2_framebuffer *fbuf);
194 struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q);
196 /* Used on videobuf-dvb */
197 void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
198 struct videobuf_buffer *buf);
200 void videobuf_queue_core_init(struct videobuf_queue *q,
201 const struct videobuf_queue_ops *ops,
204 enum v4l2_buf_type type,
205 enum v4l2_field field,
208 struct videobuf_qtype_ops *int_ops,
209 struct mutex *ext_lock);
210 int videobuf_queue_is_busy(struct videobuf_queue *q);
211 void videobuf_queue_cancel(struct videobuf_queue *q);
213 enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
214 int videobuf_reqbufs(struct videobuf_queue *q,
215 struct v4l2_requestbuffers *req);
216 int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
217 int videobuf_qbuf(struct videobuf_queue *q,
218 struct v4l2_buffer *b);
219 int videobuf_dqbuf(struct videobuf_queue *q,
220 struct v4l2_buffer *b, int nonblocking);
221 int videobuf_streamon(struct videobuf_queue *q);
222 int videobuf_streamoff(struct videobuf_queue *q);
224 void videobuf_stop(struct videobuf_queue *q);
226 int videobuf_read_start(struct videobuf_queue *q);
227 void videobuf_read_stop(struct videobuf_queue *q);
228 ssize_t videobuf_read_stream(struct videobuf_queue *q,
229 char __user *data, size_t count, loff_t *ppos,
230 int vbihack, int nonblocking);
231 ssize_t videobuf_read_one(struct videobuf_queue *q,
232 char __user *data, size_t count, loff_t *ppos,
234 unsigned int videobuf_poll_stream(struct file *file,
235 struct videobuf_queue *q,
238 int videobuf_mmap_setup(struct videobuf_queue *q,
239 unsigned int bcount, unsigned int bsize,
240 enum v4l2_memory memory);
241 int __videobuf_mmap_setup(struct videobuf_queue *q,
242 unsigned int bcount, unsigned int bsize,
243 enum v4l2_memory memory);
244 int videobuf_mmap_free(struct videobuf_queue *q);
245 int videobuf_mmap_mapper(struct videobuf_queue *q,
246 struct vm_area_struct *vma);