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7a7d9a89 MCC |
1 | /* |
2 | * generic helper functions for handling video4linux capture buffers | |
3 | * | |
32590819 | 4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 MCC |
5 | * |
6 | * Highly based on video-buf written originally by: | |
7 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> | |
32590819 | 8 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org> |
7a7d9a89 MCC |
9 | * (c) 2006 Ted Walther and John Sokol |
10 | * | |
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 | |
14 | */ | |
15 | ||
59d34489 MCC |
16 | #ifndef _VIDEOBUF_CORE_H |
17 | #define _VIDEOBUF_CORE_H | |
18 | ||
7a7d9a89 | 19 | #include <linux/poll.h> |
7a7d9a89 MCC |
20 | #include <linux/videodev2.h> |
21 | ||
22 | #define UNSET (-1U) | |
23 | ||
24 | ||
25 | struct videobuf_buffer; | |
26 | struct videobuf_queue; | |
27 | ||
28 | /* --------------------------------------------------------------------- */ | |
29 | ||
30 | /* | |
31 | * A small set of helper functions to manage video4linux buffers. | |
32 | * | |
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. | |
37 | * | |
38 | * about the mmap helpers (videobuf_mmap_*): | |
39 | * | |
e1c05067 | 40 | * The mmaper function allows to map any subset of contiguous buffers. |
7a7d9a89 MCC |
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 | |
43 | * (which v4l2 uses). | |
44 | * | |
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. | |
48 | * | |
49 | */ | |
50 | ||
51 | struct videobuf_mapping { | |
52 | unsigned int count; | |
7a7d9a89 MCC |
53 | struct videobuf_queue *q; |
54 | }; | |
55 | ||
56 | enum videobuf_state { | |
0fc0686e BP |
57 | VIDEOBUF_NEEDS_INIT = 0, |
58 | VIDEOBUF_PREPARED = 1, | |
59 | VIDEOBUF_QUEUED = 2, | |
60 | VIDEOBUF_ACTIVE = 3, | |
61 | VIDEOBUF_DONE = 4, | |
62 | VIDEOBUF_ERROR = 5, | |
63 | VIDEOBUF_IDLE = 6, | |
7a7d9a89 MCC |
64 | }; |
65 | ||
66 | struct videobuf_buffer { | |
67 | unsigned int i; | |
68 | u32 magic; | |
69 | ||
70 | /* info about the buffer */ | |
71 | unsigned int width; | |
72 | unsigned int height; | |
73 | unsigned int bytesperline; /* use only if != 0 */ | |
74 | unsigned long size; | |
7a7d9a89 MCC |
75 | enum v4l2_field field; |
76 | enum videobuf_state state; | |
77 | struct list_head stream; /* QBUF/DQBUF list */ | |
78 | ||
79 | /* touched by irq handler */ | |
80 | struct list_head queue; | |
81 | wait_queue_head_t done; | |
82 | unsigned int field_count; | |
83 | struct timeval ts; | |
84 | ||
85 | /* Memory type */ | |
86 | enum v4l2_memory memory; | |
87 | ||
88 | /* buffer size */ | |
89 | size_t bsize; | |
90 | ||
91 | /* buffer offset (mmap + overlay) */ | |
92 | size_t boff; | |
93 | ||
94 | /* buffer addr (userland ptr!) */ | |
95 | unsigned long baddr; | |
96 | ||
851c0c96 MCC |
97 | /* for mmap'ed buffers */ |
98 | struct videobuf_mapping *map; | |
99 | ||
7a7d9a89 MCC |
100 | /* Private pointer to allow specific methods to store their data */ |
101 | int privsize; | |
102 | void *priv; | |
103 | }; | |
104 | ||
105 | struct videobuf_queue_ops { | |
106 | int (*buf_setup)(struct videobuf_queue *q, | |
107 | unsigned int *count, unsigned int *size); | |
108 | int (*buf_prepare)(struct videobuf_queue *q, | |
109 | struct videobuf_buffer *vb, | |
110 | enum v4l2_field field); | |
111 | void (*buf_queue)(struct videobuf_queue *q, | |
112 | struct videobuf_buffer *vb); | |
113 | void (*buf_release)(struct videobuf_queue *q, | |
114 | struct videobuf_buffer *vb); | |
115 | }; | |
116 | ||
117 | #define MAGIC_QTYPE_OPS 0x12261003 | |
118 | ||
119 | /* Helper operations - device type dependent */ | |
120 | struct videobuf_qtype_ops { | |
121 | u32 magic; | |
122 | ||
33c38283 | 123 | struct videobuf_buffer *(*alloc_vb)(size_t size); |
037c75eb | 124 | void *(*vaddr) (struct videobuf_buffer *buf); |
7a02264c | 125 | int (*iolock) (struct videobuf_queue *q, |
7a7d9a89 MCC |
126 | struct videobuf_buffer *vb, |
127 | struct v4l2_framebuffer *fbuf); | |
7a02264c | 128 | int (*sync) (struct videobuf_queue *q, |
7a7d9a89 | 129 | struct videobuf_buffer *buf); |
7a7d9a89 | 130 | int (*mmap_mapper) (struct videobuf_queue *q, |
0b62b737 HV |
131 | struct videobuf_buffer *buf, |
132 | struct vm_area_struct *vma); | |
7a7d9a89 MCC |
133 | }; |
134 | ||
135 | struct videobuf_queue { | |
64f9477f | 136 | struct mutex vb_lock; |
97397687 | 137 | struct mutex *ext_lock; |
7a7d9a89 | 138 | spinlock_t *irqlock; |
e9bcf667 | 139 | struct device *dev; |
7a7d9a89 | 140 | |
137d1cb1 BP |
141 | wait_queue_head_t wait; /* wait if queue is empty */ |
142 | ||
7a7d9a89 | 143 | enum v4l2_buf_type type; |
7a7d9a89 MCC |
144 | unsigned int msize; |
145 | enum v4l2_field field; | |
146 | enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */ | |
147 | struct videobuf_buffer *bufs[VIDEO_MAX_FRAME]; | |
38a54f35 | 148 | const struct videobuf_queue_ops *ops; |
7a7d9a89 MCC |
149 | struct videobuf_qtype_ops *int_ops; |
150 | ||
d6964aa8 BP |
151 | unsigned int streaming:1; |
152 | unsigned int reading:1; | |
d05051c8 | 153 | |
7a7d9a89 | 154 | /* capture via mmap() + ioctl(QBUF/DQBUF) */ |
7a7d9a89 MCC |
155 | struct list_head stream; |
156 | ||
157 | /* capture via read() */ | |
7a7d9a89 MCC |
158 | unsigned int read_off; |
159 | struct videobuf_buffer *read_buf; | |
160 | ||
161 | /* driver private data */ | |
162 | void *priv_data; | |
7a7d9a89 MCC |
163 | }; |
164 | ||
97397687 HV |
165 | static inline void videobuf_queue_lock(struct videobuf_queue *q) |
166 | { | |
167 | if (!q->ext_lock) | |
168 | mutex_lock(&q->vb_lock); | |
169 | } | |
170 | ||
171 | static inline void videobuf_queue_unlock(struct videobuf_queue *q) | |
172 | { | |
173 | if (!q->ext_lock) | |
174 | mutex_unlock(&q->vb_lock); | |
175 | } | |
176 | ||
0e0809a5 HV |
177 | int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb, |
178 | int non_blocking, int intr); | |
7a02264c | 179 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
180 | struct v4l2_framebuffer *fbuf); |
181 | ||
33c38283 | 182 | struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q); |
7a7d9a89 | 183 | |
59d34489 | 184 | /* Used on videobuf-dvb */ |
f4fce60e HV |
185 | void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
186 | struct videobuf_buffer *buf); | |
59d34489 | 187 | |
d4cae5a5 | 188 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 189 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 190 | struct device *dev, |
7a7d9a89 MCC |
191 | spinlock_t *irqlock, |
192 | enum v4l2_buf_type type, | |
193 | enum v4l2_field field, | |
194 | unsigned int msize, | |
d4cae5a5 | 195 | void *priv, |
08bff03e HV |
196 | struct videobuf_qtype_ops *int_ops, |
197 | struct mutex *ext_lock); | |
7a7d9a89 MCC |
198 | int videobuf_queue_is_busy(struct videobuf_queue *q); |
199 | void videobuf_queue_cancel(struct videobuf_queue *q); | |
200 | ||
201 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q); | |
202 | int videobuf_reqbufs(struct videobuf_queue *q, | |
203 | struct v4l2_requestbuffers *req); | |
204 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b); | |
205 | int videobuf_qbuf(struct videobuf_queue *q, | |
206 | struct v4l2_buffer *b); | |
207 | int videobuf_dqbuf(struct videobuf_queue *q, | |
208 | struct v4l2_buffer *b, int nonblocking); | |
7a7d9a89 MCC |
209 | int videobuf_streamon(struct videobuf_queue *q); |
210 | int videobuf_streamoff(struct videobuf_queue *q); | |
211 | ||
19bc5133 BP |
212 | void videobuf_stop(struct videobuf_queue *q); |
213 | ||
7a7d9a89 MCC |
214 | int videobuf_read_start(struct videobuf_queue *q); |
215 | void videobuf_read_stop(struct videobuf_queue *q); | |
216 | ssize_t videobuf_read_stream(struct videobuf_queue *q, | |
217 | char __user *data, size_t count, loff_t *ppos, | |
218 | int vbihack, int nonblocking); | |
219 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
220 | char __user *data, size_t count, loff_t *ppos, | |
221 | int nonblocking); | |
c23e0cb8 | 222 | __poll_t videobuf_poll_stream(struct file *file, |
7a7d9a89 MCC |
223 | struct videobuf_queue *q, |
224 | poll_table *wait); | |
225 | ||
226 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
227 | unsigned int bcount, unsigned int bsize, | |
228 | enum v4l2_memory memory); | |
81b2dbca AV |
229 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
230 | unsigned int bcount, unsigned int bsize, | |
231 | enum v4l2_memory memory); | |
7a7d9a89 MCC |
232 | int videobuf_mmap_free(struct videobuf_queue *q); |
233 | int videobuf_mmap_mapper(struct videobuf_queue *q, | |
234 | struct vm_area_struct *vma); | |
235 | ||
59d34489 | 236 | #endif |