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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 | ||
16 | #include <linux/poll.h> | |
17 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
18 | #include <linux/videodev.h> | |
19 | #endif | |
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 | * | |
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 | |
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; | |
53 | unsigned long start; | |
54 | unsigned long end; | |
55 | struct videobuf_queue *q; | |
56 | }; | |
57 | ||
58 | enum videobuf_state { | |
59 | STATE_NEEDS_INIT = 0, | |
60 | STATE_PREPARED = 1, | |
61 | STATE_QUEUED = 2, | |
62 | STATE_ACTIVE = 3, | |
63 | STATE_DONE = 4, | |
64 | STATE_ERROR = 5, | |
65 | STATE_IDLE = 6, | |
66 | }; | |
67 | ||
68 | struct videobuf_buffer { | |
69 | unsigned int i; | |
70 | u32 magic; | |
71 | ||
72 | /* info about the buffer */ | |
73 | unsigned int width; | |
74 | unsigned int height; | |
75 | unsigned int bytesperline; /* use only if != 0 */ | |
76 | unsigned long size; | |
77 | unsigned int input; | |
78 | enum v4l2_field field; | |
79 | enum videobuf_state state; | |
80 | struct list_head stream; /* QBUF/DQBUF list */ | |
81 | ||
82 | /* touched by irq handler */ | |
83 | struct list_head queue; | |
84 | wait_queue_head_t done; | |
85 | unsigned int field_count; | |
86 | struct timeval ts; | |
87 | ||
88 | /* Memory type */ | |
89 | enum v4l2_memory memory; | |
90 | ||
91 | /* buffer size */ | |
92 | size_t bsize; | |
93 | ||
94 | /* buffer offset (mmap + overlay) */ | |
95 | size_t boff; | |
96 | ||
97 | /* buffer addr (userland ptr!) */ | |
98 | unsigned long baddr; | |
99 | ||
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 | ||
123 | void* (*alloc) (size_t size); | |
124 | int (*iolock) (struct videobuf_queue* q, | |
125 | struct videobuf_buffer *vb, | |
126 | struct v4l2_framebuffer *fbuf); | |
127 | int (*mmap) (struct videobuf_queue *q, | |
128 | unsigned int *count, | |
129 | unsigned int *size, | |
130 | enum v4l2_memory memory); | |
131 | int (*sync) (struct videobuf_queue* q, | |
132 | struct videobuf_buffer *buf); | |
133 | int (*copy_to_user) (struct videobuf_queue *q, | |
134 | char __user *data, | |
135 | size_t count, | |
136 | int nonblocking); | |
137 | int (*copy_stream) (struct videobuf_queue *q, | |
138 | char __user *data, | |
139 | size_t count, | |
140 | size_t pos, | |
141 | int vbihack, | |
142 | int nonblocking); | |
143 | int (*mmap_free) (struct videobuf_queue *q); | |
144 | int (*mmap_mapper) (struct videobuf_queue *q, | |
145 | struct vm_area_struct *vma); | |
146 | int (*is_mmapped) (struct videobuf_buffer *buf); | |
147 | }; | |
148 | ||
149 | struct videobuf_queue { | |
150 | struct mutex lock; | |
151 | spinlock_t *irqlock; | |
152 | void *dev; /* on pci, points to struct pci_dev */ | |
153 | ||
154 | enum v4l2_buf_type type; | |
155 | unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */ | |
156 | unsigned int msize; | |
157 | enum v4l2_field field; | |
158 | enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */ | |
159 | struct videobuf_buffer *bufs[VIDEO_MAX_FRAME]; | |
160 | struct videobuf_queue_ops *ops; | |
161 | struct videobuf_qtype_ops *int_ops; | |
162 | ||
163 | /* capture via mmap() + ioctl(QBUF/DQBUF) */ | |
164 | unsigned int streaming; | |
165 | struct list_head stream; | |
166 | ||
167 | /* capture via read() */ | |
168 | unsigned int reading; | |
169 | unsigned int read_off; | |
170 | struct videobuf_buffer *read_buf; | |
171 | ||
172 | /* driver private data */ | |
173 | void *priv_data; | |
174 | ||
175 | /*FIXME: should be removed after completing the vb conversion */ | |
176 | void *priv_ops; | |
177 | }; | |
178 | ||
179 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr); | |
180 | int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb, | |
181 | struct v4l2_framebuffer *fbuf); | |
182 | ||
183 | void *videobuf_alloc(struct videobuf_queue* q); | |
184 | ||
185 | void videobuf_queue_init(struct videobuf_queue *q, | |
186 | struct videobuf_queue_ops *ops, | |
187 | void *dev, | |
188 | spinlock_t *irqlock, | |
189 | enum v4l2_buf_type type, | |
190 | enum v4l2_field field, | |
191 | unsigned int msize, | |
192 | void *priv); | |
193 | int videobuf_queue_is_busy(struct videobuf_queue *q); | |
194 | void videobuf_queue_cancel(struct videobuf_queue *q); | |
195 | ||
196 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q); | |
197 | int videobuf_reqbufs(struct videobuf_queue *q, | |
198 | struct v4l2_requestbuffers *req); | |
199 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b); | |
200 | int videobuf_qbuf(struct videobuf_queue *q, | |
201 | struct v4l2_buffer *b); | |
202 | int videobuf_dqbuf(struct videobuf_queue *q, | |
203 | struct v4l2_buffer *b, int nonblocking); | |
204 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
205 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
206 | struct video_mbuf *mbuf, int count); | |
207 | #endif | |
208 | int videobuf_streamon(struct videobuf_queue *q); | |
209 | int videobuf_streamoff(struct videobuf_queue *q); | |
210 | ||
211 | int videobuf_read_start(struct videobuf_queue *q); | |
212 | void videobuf_read_stop(struct videobuf_queue *q); | |
213 | ssize_t videobuf_read_stream(struct videobuf_queue *q, | |
214 | char __user *data, size_t count, loff_t *ppos, | |
215 | int vbihack, int nonblocking); | |
216 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
217 | char __user *data, size_t count, loff_t *ppos, | |
218 | int nonblocking); | |
219 | unsigned int videobuf_poll_stream(struct file *file, | |
220 | struct videobuf_queue *q, | |
221 | poll_table *wait); | |
222 | ||
223 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
224 | unsigned int bcount, unsigned int bsize, | |
225 | enum v4l2_memory memory); | |
226 | int videobuf_mmap_free(struct videobuf_queue *q); | |
227 | int videobuf_mmap_mapper(struct videobuf_queue *q, | |
228 | struct vm_area_struct *vma); | |
229 | ||
230 | /* --------------------------------------------------------------------- */ | |
231 | ||
232 | /* | |
233 | * Local variables: | |
234 | * c-basic-offset: 8 | |
235 | * End: | |
236 | */ |