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7a7d9a89 MCC |
1 | /* |
2 | * generic helper functions for handling video4linux capture buffers | |
3 | * | |
4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> | |
5 | * | |
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 | |
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 MCC |
19 | #include <linux/poll.h> |
20 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
5e585ef1 | 21 | #define __MIN_V4L1 |
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22 | #include <linux/videodev.h> |
23 | #endif | |
24 | #include <linux/videodev2.h> | |
25 | ||
26 | #define UNSET (-1U) | |
27 | ||
28 | ||
29 | struct videobuf_buffer; | |
30 | struct videobuf_queue; | |
31 | ||
32 | /* --------------------------------------------------------------------- */ | |
33 | ||
34 | /* | |
35 | * A small set of helper functions to manage video4linux buffers. | |
36 | * | |
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. | |
41 | * | |
42 | * about the mmap helpers (videobuf_mmap_*): | |
43 | * | |
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 | |
47 | * (which v4l2 uses). | |
48 | * | |
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. | |
52 | * | |
53 | */ | |
54 | ||
55 | struct videobuf_mapping { | |
56 | unsigned int count; | |
57 | unsigned long start; | |
58 | unsigned long end; | |
59 | struct videobuf_queue *q; | |
60 | }; | |
61 | ||
62 | enum videobuf_state { | |
0fc0686e BP |
63 | VIDEOBUF_NEEDS_INIT = 0, |
64 | VIDEOBUF_PREPARED = 1, | |
65 | VIDEOBUF_QUEUED = 2, | |
66 | VIDEOBUF_ACTIVE = 3, | |
67 | VIDEOBUF_DONE = 4, | |
68 | VIDEOBUF_ERROR = 5, | |
69 | VIDEOBUF_IDLE = 6, | |
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70 | }; |
71 | ||
72 | struct videobuf_buffer { | |
73 | unsigned int i; | |
74 | u32 magic; | |
75 | ||
76 | /* info about the buffer */ | |
77 | unsigned int width; | |
78 | unsigned int height; | |
79 | unsigned int bytesperline; /* use only if != 0 */ | |
80 | unsigned long size; | |
81 | unsigned int input; | |
82 | enum v4l2_field field; | |
83 | enum videobuf_state state; | |
84 | struct list_head stream; /* QBUF/DQBUF list */ | |
85 | ||
86 | /* touched by irq handler */ | |
87 | struct list_head queue; | |
88 | wait_queue_head_t done; | |
89 | unsigned int field_count; | |
90 | struct timeval ts; | |
91 | ||
92 | /* Memory type */ | |
93 | enum v4l2_memory memory; | |
94 | ||
95 | /* buffer size */ | |
96 | size_t bsize; | |
97 | ||
98 | /* buffer offset (mmap + overlay) */ | |
99 | size_t boff; | |
100 | ||
101 | /* buffer addr (userland ptr!) */ | |
102 | unsigned long baddr; | |
103 | ||
851c0c96 MCC |
104 | /* for mmap'ed buffers */ |
105 | struct videobuf_mapping *map; | |
106 | ||
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107 | /* Private pointer to allow specific methods to store their data */ |
108 | int privsize; | |
109 | void *priv; | |
110 | }; | |
111 | ||
112 | struct videobuf_queue_ops { | |
113 | int (*buf_setup)(struct videobuf_queue *q, | |
114 | unsigned int *count, unsigned int *size); | |
115 | int (*buf_prepare)(struct videobuf_queue *q, | |
116 | struct videobuf_buffer *vb, | |
117 | enum v4l2_field field); | |
118 | void (*buf_queue)(struct videobuf_queue *q, | |
119 | struct videobuf_buffer *vb); | |
120 | void (*buf_release)(struct videobuf_queue *q, | |
121 | struct videobuf_buffer *vb); | |
122 | }; | |
123 | ||
124 | #define MAGIC_QTYPE_OPS 0x12261003 | |
125 | ||
126 | /* Helper operations - device type dependent */ | |
127 | struct videobuf_qtype_ops { | |
128 | u32 magic; | |
129 | ||
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130 | void *(*alloc) (size_t size); |
131 | void *(*vmalloc) (struct videobuf_buffer *buf); | |
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132 | int (*iolock) (struct videobuf_queue* q, |
133 | struct videobuf_buffer *vb, | |
134 | struct v4l2_framebuffer *fbuf); | |
135 | int (*mmap) (struct videobuf_queue *q, | |
136 | unsigned int *count, | |
137 | unsigned int *size, | |
138 | enum v4l2_memory memory); | |
139 | int (*sync) (struct videobuf_queue* q, | |
140 | struct videobuf_buffer *buf); | |
13bcd5d0 | 141 | int (*video_copy_to_user)(struct videobuf_queue *q, |
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142 | char __user *data, |
143 | size_t count, | |
144 | int nonblocking); | |
145 | int (*copy_stream) (struct videobuf_queue *q, | |
146 | char __user *data, | |
147 | size_t count, | |
148 | size_t pos, | |
149 | int vbihack, | |
150 | int nonblocking); | |
151 | int (*mmap_free) (struct videobuf_queue *q); | |
152 | int (*mmap_mapper) (struct videobuf_queue *q, | |
153 | struct vm_area_struct *vma); | |
7a7d9a89 MCC |
154 | }; |
155 | ||
156 | struct videobuf_queue { | |
64f9477f | 157 | struct mutex vb_lock; |
7a7d9a89 | 158 | spinlock_t *irqlock; |
e9bcf667 | 159 | struct device *dev; |
7a7d9a89 | 160 | |
137d1cb1 BP |
161 | wait_queue_head_t wait; /* wait if queue is empty */ |
162 | ||
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163 | enum v4l2_buf_type type; |
164 | unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */ | |
165 | unsigned int msize; | |
166 | enum v4l2_field field; | |
167 | enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */ | |
168 | struct videobuf_buffer *bufs[VIDEO_MAX_FRAME]; | |
38a54f35 | 169 | const struct videobuf_queue_ops *ops; |
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170 | struct videobuf_qtype_ops *int_ops; |
171 | ||
d6964aa8 BP |
172 | unsigned int streaming:1; |
173 | unsigned int reading:1; | |
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174 | unsigned int is_mmapped:1; |
175 | ||
7a7d9a89 | 176 | /* capture via mmap() + ioctl(QBUF/DQBUF) */ |
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177 | struct list_head stream; |
178 | ||
179 | /* capture via read() */ | |
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180 | unsigned int read_off; |
181 | struct videobuf_buffer *read_buf; | |
182 | ||
183 | /* driver private data */ | |
184 | void *priv_data; | |
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185 | }; |
186 | ||
187 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr); | |
188 | int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb, | |
189 | struct v4l2_framebuffer *fbuf); | |
190 | ||
191 | void *videobuf_alloc(struct videobuf_queue* q); | |
192 | ||
59d34489 MCC |
193 | /* Used on videobuf-dvb */ |
194 | void *videobuf_queue_to_vmalloc (struct videobuf_queue* q, | |
195 | struct videobuf_buffer *buf); | |
196 | ||
d4cae5a5 | 197 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 198 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 199 | struct device *dev, |
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200 | spinlock_t *irqlock, |
201 | enum v4l2_buf_type type, | |
202 | enum v4l2_field field, | |
203 | unsigned int msize, | |
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204 | void *priv, |
205 | struct videobuf_qtype_ops *int_ops); | |
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206 | int videobuf_queue_is_busy(struct videobuf_queue *q); |
207 | void videobuf_queue_cancel(struct videobuf_queue *q); | |
208 | ||
209 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q); | |
210 | int videobuf_reqbufs(struct videobuf_queue *q, | |
211 | struct v4l2_requestbuffers *req); | |
212 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b); | |
213 | int videobuf_qbuf(struct videobuf_queue *q, | |
214 | struct v4l2_buffer *b); | |
215 | int videobuf_dqbuf(struct videobuf_queue *q, | |
216 | struct v4l2_buffer *b, int nonblocking); | |
217 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
218 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
219 | struct video_mbuf *mbuf, int count); | |
220 | #endif | |
221 | int videobuf_streamon(struct videobuf_queue *q); | |
222 | int videobuf_streamoff(struct videobuf_queue *q); | |
223 | ||
19bc5133 BP |
224 | void videobuf_stop(struct videobuf_queue *q); |
225 | ||
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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, | |
233 | int nonblocking); | |
234 | unsigned int videobuf_poll_stream(struct file *file, | |
235 | struct videobuf_queue *q, | |
236 | poll_table *wait); | |
237 | ||
238 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
239 | unsigned int bcount, unsigned int bsize, | |
240 | enum v4l2_memory memory); | |
81b2dbca AV |
241 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
242 | unsigned int bcount, unsigned int bsize, | |
243 | enum v4l2_memory memory); | |
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244 | int videobuf_mmap_free(struct videobuf_queue *q); |
245 | int videobuf_mmap_mapper(struct videobuf_queue *q, | |
246 | struct vm_area_struct *vma); | |
247 | ||
59d34489 | 248 | #endif |