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Commit | Line | Data |
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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/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
27ac792c | 19 | #include <linux/mm.h> |
d43c36dc | 20 | #include <linux/sched.h> |
7a7d9a89 MCC |
21 | #include <linux/slab.h> |
22 | #include <linux/interrupt.h> | |
23 | ||
24 | #include <media/videobuf-core.h> | |
25 | ||
26 | #define MAGIC_BUFFER 0x20070728 | |
7a02264c PO |
27 | #define MAGIC_CHECK(is, should) \ |
28 | do { \ | |
29 | if (unlikely((is) != (should))) { \ | |
30 | printk(KERN_ERR \ | |
31 | "magic mismatch: %x (expected %x)\n", \ | |
32 | is, should); \ | |
33 | BUG(); \ | |
34 | } \ | |
35 | } while (0) | |
7a7d9a89 | 36 | |
e2c77314 | 37 | static int debug; |
7a7d9a89 MCC |
38 | module_param(debug, int, 0644); |
39 | ||
40 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); | |
41 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
7a02264c PO |
44 | #define dprintk(level, fmt, arg...) \ |
45 | do { \ | |
46 | if (debug >= level) \ | |
47 | printk(KERN_DEBUG "vbuf: " fmt, ## arg); \ | |
48 | } while (0) | |
7a7d9a89 MCC |
49 | |
50 | /* --------------------------------------------------------------------- */ | |
51 | ||
52 | #define CALL(q, f, arg...) \ | |
e2c77314 | 53 | ((q->int_ops->f) ? q->int_ops->f(arg) : 0) |
a8d54e4c HV |
54 | #define CALLPTR(q, f, arg...) \ |
55 | ((q->int_ops->f) ? q->int_ops->f(arg) : NULL) | |
7a7d9a89 | 56 | |
33c38283 | 57 | struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q) |
7a7d9a89 MCC |
58 | { |
59 | struct videobuf_buffer *vb; | |
60 | ||
e2c77314 | 61 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 | 62 | |
33c38283 | 63 | if (!q->int_ops || !q->int_ops->alloc_vb) { |
7a7d9a89 MCC |
64 | printk(KERN_ERR "No specific ops defined!\n"); |
65 | BUG(); | |
66 | } | |
67 | ||
33c38283 | 68 | vb = q->int_ops->alloc_vb(q->msize); |
7a7d9a89 MCC |
69 | if (NULL != vb) { |
70 | init_waitqueue_head(&vb->done); | |
7a02264c | 71 | vb->magic = MAGIC_BUFFER; |
7a7d9a89 MCC |
72 | } |
73 | ||
74 | return vb; | |
75 | } | |
33c38283 | 76 | EXPORT_SYMBOL_GPL(videobuf_alloc_vb); |
7a7d9a89 | 77 | |
5eba1726 GL |
78 | static int state_neither_active_nor_queued(struct videobuf_queue *q, |
79 | struct videobuf_buffer *vb) | |
7a7d9a89 | 80 | { |
0e0809a5 HV |
81 | unsigned long flags; |
82 | bool rc; | |
83 | ||
84 | spin_lock_irqsave(q->irqlock, flags); | |
85 | rc = vb->state != VIDEOBUF_ACTIVE && vb->state != VIDEOBUF_QUEUED; | |
86 | spin_unlock_irqrestore(q->irqlock, flags); | |
87 | return rc; | |
88 | }; | |
89 | ||
90 | int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb, | |
91 | int non_blocking, int intr) | |
92 | { | |
93 | bool is_ext_locked; | |
94 | int ret = 0; | |
95 | ||
e2c77314 | 96 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
97 | |
98 | if (non_blocking) { | |
5eba1726 | 99 | if (state_neither_active_nor_queued(q, vb)) |
009a9059 | 100 | return 0; |
0e0809a5 | 101 | return -EAGAIN; |
7a7d9a89 | 102 | } |
009a9059 | 103 | |
0e0809a5 HV |
104 | is_ext_locked = q->ext_lock && mutex_is_locked(q->ext_lock); |
105 | ||
106 | /* Release vdev lock to prevent this wait from blocking outside access to | |
107 | the device. */ | |
108 | if (is_ext_locked) | |
109 | mutex_unlock(q->ext_lock); | |
009a9059 | 110 | if (intr) |
5eba1726 GL |
111 | ret = wait_event_interruptible(vb->done, |
112 | state_neither_active_nor_queued(q, vb)); | |
009a9059 | 113 | else |
5eba1726 | 114 | wait_event(vb->done, state_neither_active_nor_queued(q, vb)); |
0e0809a5 HV |
115 | /* Relock */ |
116 | if (is_ext_locked) | |
117 | mutex_lock(q->ext_lock); | |
009a9059 | 118 | |
0e0809a5 | 119 | return ret; |
7a7d9a89 | 120 | } |
7a02264c | 121 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
7a7d9a89 | 122 | |
e2c77314 | 123 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
124 | struct v4l2_framebuffer *fbuf) |
125 | { | |
e2c77314 MCC |
126 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
127 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 128 | |
e2c77314 | 129 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 | 130 | } |
7a02264c | 131 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
7a7d9a89 | 132 | |
f4fce60e HV |
133 | void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
134 | struct videobuf_buffer *buf) | |
59d34489 | 135 | { |
037c75eb HV |
136 | if (q->int_ops->vaddr) |
137 | return q->int_ops->vaddr(buf); | |
f4fce60e | 138 | return NULL; |
59d34489 | 139 | } |
f4fce60e | 140 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr); |
59d34489 | 141 | |
7a7d9a89 MCC |
142 | /* --------------------------------------------------------------------- */ |
143 | ||
144 | ||
e2c77314 | 145 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 146 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 147 | struct device *dev, |
7a7d9a89 MCC |
148 | spinlock_t *irqlock, |
149 | enum v4l2_buf_type type, | |
150 | enum v4l2_field field, | |
151 | unsigned int msize, | |
d4cae5a5 | 152 | void *priv, |
08bff03e HV |
153 | struct videobuf_qtype_ops *int_ops, |
154 | struct mutex *ext_lock) | |
7a7d9a89 | 155 | { |
96ceea27 | 156 | BUG_ON(!q); |
e2c77314 | 157 | memset(q, 0, sizeof(*q)); |
d4cae5a5 | 158 | q->irqlock = irqlock; |
08bff03e | 159 | q->ext_lock = ext_lock; |
d4cae5a5 MCC |
160 | q->dev = dev; |
161 | q->type = type; | |
162 | q->field = field; | |
163 | q->msize = msize; | |
164 | q->ops = ops; | |
7a7d9a89 | 165 | q->priv_data = priv; |
d4cae5a5 | 166 | q->int_ops = int_ops; |
7a7d9a89 MCC |
167 | |
168 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
169 | BUG_ON(!q->ops->buf_setup); |
170 | BUG_ON(!q->ops->buf_prepare); | |
171 | BUG_ON(!q->ops->buf_queue); | |
172 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 173 | |
0cf4daee BP |
174 | /* Lock is mandatory for queue_cancel to work */ |
175 | BUG_ON(!irqlock); | |
176 | ||
d4cae5a5 | 177 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 178 | BUG_ON(!q->int_ops); |
d4cae5a5 | 179 | |
64f9477f | 180 | mutex_init(&q->vb_lock); |
137d1cb1 | 181 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
182 | INIT_LIST_HEAD(&q->stream); |
183 | } | |
7a02264c | 184 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 185 | |
19bc5133 | 186 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
187 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
188 | { | |
189 | int i; | |
190 | ||
e2c77314 | 191 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
192 | |
193 | if (q->streaming) { | |
e2c77314 | 194 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
195 | return 1; |
196 | } | |
197 | if (q->reading) { | |
e2c77314 | 198 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
199 | return 1; |
200 | } | |
201 | if (q->read_buf) { | |
e2c77314 | 202 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
203 | return 1; |
204 | } | |
205 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
206 | if (NULL == q->bufs[i]) | |
207 | continue; | |
851c0c96 | 208 | if (q->bufs[i]->map) { |
e2c77314 | 209 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
210 | return 1; |
211 | } | |
0fc0686e | 212 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 213 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
214 | return 1; |
215 | } | |
0fc0686e | 216 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 217 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
218 | return 1; |
219 | } | |
220 | } | |
221 | return 0; | |
222 | } | |
7a02264c | 223 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 224 | |
a438d6da PO |
225 | /** |
226 | * __videobuf_free() - free all the buffers and their control structures | |
227 | * | |
228 | * This function can only be called if streaming/reading is off, i.e. no buffers | |
229 | * are under control of the driver. | |
230 | */ | |
231 | /* Locking: Caller holds q->vb_lock */ | |
232 | static int __videobuf_free(struct videobuf_queue *q) | |
233 | { | |
234 | int i; | |
235 | ||
236 | dprintk(1, "%s\n", __func__); | |
237 | if (!q) | |
238 | return 0; | |
239 | ||
240 | if (q->streaming || q->reading) { | |
241 | dprintk(1, "Cannot free buffers when streaming or reading\n"); | |
242 | return -EBUSY; | |
243 | } | |
244 | ||
245 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
246 | ||
247 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | |
248 | if (q->bufs[i] && q->bufs[i]->map) { | |
249 | dprintk(1, "Cannot free mmapped buffers\n"); | |
250 | return -EBUSY; | |
251 | } | |
252 | ||
253 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
254 | if (NULL == q->bufs[i]) | |
255 | continue; | |
256 | q->ops->buf_release(q, q->bufs[i]); | |
257 | kfree(q->bufs[i]); | |
258 | q->bufs[i] = NULL; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
64f9477f | 264 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
265 | void videobuf_queue_cancel(struct videobuf_queue *q) |
266 | { | |
e2c77314 | 267 | unsigned long flags = 0; |
7a7d9a89 MCC |
268 | int i; |
269 | ||
137d1cb1 BP |
270 | q->streaming = 0; |
271 | q->reading = 0; | |
272 | wake_up_interruptible_sync(&q->wait); | |
273 | ||
7a7d9a89 | 274 | /* remove queued buffers from list */ |
0cf4daee | 275 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
276 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
277 | if (NULL == q->bufs[i]) | |
278 | continue; | |
0fc0686e | 279 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 280 | list_del(&q->bufs[i]->queue); |
0fc0686e | 281 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 282 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
283 | } |
284 | } | |
0cf4daee | 285 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
286 | |
287 | /* free all buffers + clear queue */ | |
288 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
289 | if (NULL == q->bufs[i]) | |
290 | continue; | |
e2c77314 | 291 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
292 | } |
293 | INIT_LIST_HEAD(&q->stream); | |
294 | } | |
7a02264c | 295 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
296 | |
297 | /* --------------------------------------------------------------------- */ | |
298 | ||
64f9477f | 299 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
300 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
301 | { | |
302 | enum v4l2_field field = q->field; | |
303 | ||
304 | BUG_ON(V4L2_FIELD_ANY == field); | |
305 | ||
306 | if (V4L2_FIELD_ALTERNATE == field) { | |
307 | if (V4L2_FIELD_TOP == q->last) { | |
308 | field = V4L2_FIELD_BOTTOM; | |
309 | q->last = V4L2_FIELD_BOTTOM; | |
310 | } else { | |
311 | field = V4L2_FIELD_TOP; | |
312 | q->last = V4L2_FIELD_TOP; | |
313 | } | |
314 | } | |
315 | return field; | |
316 | } | |
7a02264c | 317 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 318 | |
64f9477f | 319 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
320 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
321 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
322 | { | |
e2c77314 MCC |
323 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
324 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
325 | |
326 | b->index = vb->i; | |
327 | b->type = type; | |
328 | ||
329 | b->memory = vb->memory; | |
330 | switch (b->memory) { | |
331 | case V4L2_MEMORY_MMAP: | |
332 | b->m.offset = vb->boff; | |
333 | b->length = vb->bsize; | |
334 | break; | |
335 | case V4L2_MEMORY_USERPTR: | |
336 | b->m.userptr = vb->baddr; | |
337 | b->length = vb->bsize; | |
338 | break; | |
339 | case V4L2_MEMORY_OVERLAY: | |
340 | b->m.offset = vb->boff; | |
341 | break; | |
3c3016ba SS |
342 | case V4L2_MEMORY_DMABUF: |
343 | /* DMABUF is not handled in videobuf framework */ | |
344 | break; | |
7a7d9a89 MCC |
345 | } |
346 | ||
1b18e7a0 | 347 | b->flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; |
851c0c96 | 348 | if (vb->map) |
7a7d9a89 MCC |
349 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
350 | ||
351 | switch (vb->state) { | |
0fc0686e BP |
352 | case VIDEOBUF_PREPARED: |
353 | case VIDEOBUF_QUEUED: | |
354 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
355 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
356 | break; | |
0fc0686e | 357 | case VIDEOBUF_ERROR: |
b2dfd1a4 HV |
358 | b->flags |= V4L2_BUF_FLAG_ERROR; |
359 | /* fall through */ | |
360 | case VIDEOBUF_DONE: | |
7a7d9a89 MCC |
361 | b->flags |= V4L2_BUF_FLAG_DONE; |
362 | break; | |
0fc0686e BP |
363 | case VIDEOBUF_NEEDS_INIT: |
364 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
365 | /* nothing */ |
366 | break; | |
367 | } | |
368 | ||
7a7d9a89 MCC |
369 | b->field = vb->field; |
370 | b->timestamp = vb->ts; | |
371 | b->bytesused = vb->size; | |
372 | b->sequence = vb->field_count >> 1; | |
373 | } | |
374 | ||
19bc5133 BP |
375 | int videobuf_mmap_free(struct videobuf_queue *q) |
376 | { | |
377 | int ret; | |
97397687 | 378 | videobuf_queue_lock(q); |
a438d6da | 379 | ret = __videobuf_free(q); |
97397687 | 380 | videobuf_queue_unlock(q); |
19bc5133 BP |
381 | return ret; |
382 | } | |
7a02264c | 383 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 384 | |
64f9477f | 385 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 386 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
387 | unsigned int bcount, unsigned int bsize, |
388 | enum v4l2_memory memory) | |
389 | { | |
390 | unsigned int i; | |
391 | int err; | |
392 | ||
e2c77314 | 393 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 394 | |
a438d6da | 395 | err = __videobuf_free(q); |
19bc5133 BP |
396 | if (0 != err) |
397 | return err; | |
398 | ||
399 | /* Allocate and initialize buffers */ | |
400 | for (i = 0; i < bcount; i++) { | |
33c38283 | 401 | q->bufs[i] = videobuf_alloc_vb(q); |
19bc5133 | 402 | |
7a02264c | 403 | if (NULL == q->bufs[i]) |
19bc5133 BP |
404 | break; |
405 | ||
406 | q->bufs[i]->i = i; | |
19bc5133 BP |
407 | q->bufs[i]->memory = memory; |
408 | q->bufs[i]->bsize = bsize; | |
409 | switch (memory) { | |
410 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 411 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
412 | break; |
413 | case V4L2_MEMORY_USERPTR: | |
414 | case V4L2_MEMORY_OVERLAY: | |
3c3016ba | 415 | case V4L2_MEMORY_DMABUF: |
19bc5133 BP |
416 | /* nothing */ |
417 | break; | |
418 | } | |
419 | } | |
420 | ||
421 | if (!i) | |
422 | return -ENOMEM; | |
423 | ||
7a02264c | 424 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
425 | |
426 | return i; | |
427 | } | |
7a02264c | 428 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
429 | |
430 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
431 | unsigned int bcount, unsigned int bsize, | |
432 | enum v4l2_memory memory) | |
433 | { | |
434 | int ret; | |
97397687 | 435 | videobuf_queue_lock(q); |
19bc5133 | 436 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
97397687 | 437 | videobuf_queue_unlock(q); |
19bc5133 BP |
438 | return ret; |
439 | } | |
7a02264c | 440 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 441 | |
7a7d9a89 MCC |
442 | int videobuf_reqbufs(struct videobuf_queue *q, |
443 | struct v4l2_requestbuffers *req) | |
444 | { | |
e2c77314 | 445 | unsigned int size, count; |
7a7d9a89 MCC |
446 | int retval; |
447 | ||
7a7d9a89 MCC |
448 | if (req->memory != V4L2_MEMORY_MMAP && |
449 | req->memory != V4L2_MEMORY_USERPTR && | |
450 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 451 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
452 | return -EINVAL; |
453 | } | |
454 | ||
97397687 | 455 | videobuf_queue_lock(q); |
19bc5133 | 456 | if (req->type != q->type) { |
e2c77314 | 457 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
458 | retval = -EINVAL; |
459 | goto done; | |
460 | } | |
461 | ||
7a7d9a89 | 462 | if (q->streaming) { |
e2c77314 | 463 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
464 | retval = -EBUSY; |
465 | goto done; | |
7a7d9a89 MCC |
466 | } |
467 | if (!list_empty(&q->stream)) { | |
e2c77314 | 468 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
469 | retval = -EBUSY; |
470 | goto done; | |
7a7d9a89 MCC |
471 | } |
472 | ||
b7900eed HG |
473 | if (req->count == 0) { |
474 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); | |
475 | retval = __videobuf_free(q); | |
476 | goto done; | |
477 | } | |
478 | ||
7a7d9a89 MCC |
479 | count = req->count; |
480 | if (count > VIDEO_MAX_FRAME) | |
481 | count = VIDEO_MAX_FRAME; | |
482 | size = 0; | |
e2c77314 | 483 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
484 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
485 | count, size, | |
7a02264c | 486 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 487 | |
e2c77314 | 488 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 489 | if (retval < 0) { |
e2c77314 | 490 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
491 | goto done; |
492 | } | |
493 | ||
49ee718e | 494 | req->count = retval; |
925d74ae | 495 | retval = 0; |
7a7d9a89 MCC |
496 | |
497 | done: | |
97397687 | 498 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
499 | return retval; |
500 | } | |
7a02264c | 501 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
502 | |
503 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
504 | { | |
19bc5133 BP |
505 | int ret = -EINVAL; |
506 | ||
97397687 | 507 | videobuf_queue_lock(q); |
7a7d9a89 | 508 | if (unlikely(b->type != q->type)) { |
e2c77314 | 509 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 510 | goto done; |
7a7d9a89 | 511 | } |
223ffe5f | 512 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 513 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 514 | goto done; |
7a7d9a89 MCC |
515 | } |
516 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 517 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 518 | goto done; |
7a7d9a89 | 519 | } |
19bc5133 | 520 | |
e2c77314 | 521 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
522 | |
523 | ret = 0; | |
524 | done: | |
97397687 | 525 | videobuf_queue_unlock(q); |
19bc5133 | 526 | return ret; |
7a7d9a89 | 527 | } |
7a02264c | 528 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 529 | |
7a02264c | 530 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
531 | { |
532 | struct videobuf_buffer *buf; | |
533 | enum v4l2_field field; | |
e2c77314 | 534 | unsigned long flags = 0; |
7a7d9a89 MCC |
535 | int retval; |
536 | ||
e2c77314 | 537 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 538 | |
9900132f ML |
539 | if (b->memory == V4L2_MEMORY_MMAP) |
540 | down_read(¤t->mm->mmap_sem); | |
541 | ||
97397687 | 542 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
543 | retval = -EBUSY; |
544 | if (q->reading) { | |
e2c77314 | 545 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
546 | goto done; |
547 | } | |
548 | retval = -EINVAL; | |
549 | if (b->type != q->type) { | |
e2c77314 | 550 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
551 | goto done; |
552 | } | |
223ffe5f | 553 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 554 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
555 | goto done; |
556 | } | |
557 | buf = q->bufs[b->index]; | |
558 | if (NULL == buf) { | |
e2c77314 | 559 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
560 | goto done; |
561 | } | |
e2c77314 | 562 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 563 | if (buf->memory != b->memory) { |
e2c77314 | 564 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
565 | goto done; |
566 | } | |
0fc0686e | 567 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 568 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
569 | goto done; |
570 | } | |
571 | ||
7a7d9a89 MCC |
572 | switch (b->memory) { |
573 | case V4L2_MEMORY_MMAP: | |
574 | if (0 == buf->baddr) { | |
8720427c | 575 | dprintk(1, "qbuf: mmap requested but buffer addr is zero!\n"); |
7a7d9a89 MCC |
576 | goto done; |
577 | } | |
96f2ec67 PO |
578 | if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT |
579 | || q->type == V4L2_BUF_TYPE_VBI_OUTPUT | |
9effc72f AP |
580 | || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT |
581 | || q->type == V4L2_BUF_TYPE_SDR_OUTPUT) { | |
96f2ec67 PO |
582 | buf->size = b->bytesused; |
583 | buf->field = b->field; | |
584 | buf->ts = b->timestamp; | |
585 | } | |
7a7d9a89 MCC |
586 | break; |
587 | case V4L2_MEMORY_USERPTR: | |
588 | if (b->length < buf->bsize) { | |
e2c77314 | 589 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
590 | goto done; |
591 | } | |
e2c77314 MCC |
592 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
593 | buf->baddr != b->m.userptr) | |
594 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
595 | buf->baddr = b->m.userptr; |
596 | break; | |
597 | case V4L2_MEMORY_OVERLAY: | |
598 | buf->boff = b->m.offset; | |
599 | break; | |
600 | default: | |
e2c77314 | 601 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
602 | goto done; |
603 | } | |
604 | ||
e2c77314 | 605 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 606 | field = videobuf_next_field(q); |
e2c77314 | 607 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 608 | if (0 != retval) { |
e2c77314 | 609 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
610 | goto done; |
611 | } | |
612 | ||
e2c77314 | 613 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 614 | if (q->streaming) { |
0cf4daee | 615 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 616 | q->ops->buf_queue(q, buf); |
0cf4daee | 617 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 618 | } |
771075bb | 619 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 620 | retval = 0; |
137d1cb1 | 621 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 622 | |
7a02264c | 623 | done: |
97397687 | 624 | videobuf_queue_unlock(q); |
9900132f ML |
625 | |
626 | if (b->memory == V4L2_MEMORY_MMAP) | |
627 | up_read(¤t->mm->mmap_sem); | |
628 | ||
7a7d9a89 MCC |
629 | return retval; |
630 | } | |
7a02264c | 631 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
632 | |
633 | /* Locking: Caller holds q->vb_lock */ | |
634 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 635 | { |
7a7d9a89 MCC |
636 | int retval; |
637 | ||
137d1cb1 BP |
638 | checks: |
639 | if (!q->streaming) { | |
640 | dprintk(1, "next_buffer: Not streaming\n"); | |
641 | retval = -EINVAL; | |
7a7d9a89 MCC |
642 | goto done; |
643 | } | |
137d1cb1 | 644 | |
7a7d9a89 | 645 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
646 | if (noblock) { |
647 | retval = -EAGAIN; | |
648 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
649 | goto done; | |
650 | } else { | |
651 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
652 | ||
653 | /* Drop lock to avoid deadlock with qbuf */ | |
97397687 | 654 | videobuf_queue_unlock(q); |
137d1cb1 BP |
655 | |
656 | /* Checking list_empty and streaming is safe without | |
657 | * locks because we goto checks to validate while | |
658 | * holding locks before proceeding */ | |
659 | retval = wait_event_interruptible(q->wait, | |
660 | !list_empty(&q->stream) || !q->streaming); | |
97397687 | 661 | videobuf_queue_lock(q); |
137d1cb1 BP |
662 | |
663 | if (retval) | |
664 | goto done; | |
665 | ||
666 | goto checks; | |
667 | } | |
7a7d9a89 | 668 | } |
137d1cb1 BP |
669 | |
670 | retval = 0; | |
671 | ||
672 | done: | |
673 | return retval; | |
674 | } | |
675 | ||
137d1cb1 BP |
676 | /* Locking: Caller holds q->vb_lock */ |
677 | static int stream_next_buffer(struct videobuf_queue *q, | |
678 | struct videobuf_buffer **vb, int nonblocking) | |
679 | { | |
680 | int retval; | |
681 | struct videobuf_buffer *buf = NULL; | |
682 | ||
683 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
684 | if (retval) | |
685 | goto done; | |
686 | ||
7a7d9a89 | 687 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
0e0809a5 | 688 | retval = videobuf_waiton(q, buf, nonblocking, 1); |
137d1cb1 BP |
689 | if (retval < 0) |
690 | goto done; | |
691 | ||
692 | *vb = buf; | |
693 | done: | |
694 | return retval; | |
695 | } | |
696 | ||
697 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 698 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
699 | { |
700 | struct videobuf_buffer *buf = NULL; | |
701 | int retval; | |
702 | ||
703 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
704 | ||
b2dfd1a4 | 705 | memset(b, 0, sizeof(*b)); |
97397687 | 706 | videobuf_queue_lock(q); |
137d1cb1 BP |
707 | |
708 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 709 | if (retval < 0) { |
137d1cb1 | 710 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
711 | goto done; |
712 | } | |
137d1cb1 | 713 | |
7a7d9a89 | 714 | switch (buf->state) { |
0fc0686e | 715 | case VIDEOBUF_ERROR: |
e2c77314 | 716 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 717 | break; |
0fc0686e | 718 | case VIDEOBUF_DONE: |
e2c77314 | 719 | dprintk(1, "dqbuf: state is done\n"); |
7a7d9a89 MCC |
720 | break; |
721 | default: | |
e2c77314 | 722 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
723 | retval = -EINVAL; |
724 | goto done; | |
725 | } | |
b2dfd1a4 | 726 | CALL(q, sync, q, buf); |
e2c77314 | 727 | videobuf_status(q, b, buf, q->type); |
b2dfd1a4 HV |
728 | list_del(&buf->stream); |
729 | buf->state = VIDEOBUF_IDLE; | |
730 | b->flags &= ~V4L2_BUF_FLAG_DONE; | |
7a02264c | 731 | done: |
97397687 | 732 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
733 | return retval; |
734 | } | |
7a02264c | 735 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
736 | |
737 | int videobuf_streamon(struct videobuf_queue *q) | |
738 | { | |
739 | struct videobuf_buffer *buf; | |
e2c77314 | 740 | unsigned long flags = 0; |
7a7d9a89 MCC |
741 | int retval; |
742 | ||
97397687 | 743 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
744 | retval = -EBUSY; |
745 | if (q->reading) | |
746 | goto done; | |
747 | retval = 0; | |
748 | if (q->streaming) | |
749 | goto done; | |
750 | q->streaming = 1; | |
0cf4daee | 751 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 752 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 753 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 754 | q->ops->buf_queue(q, buf); |
0cf4daee | 755 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 756 | |
137d1cb1 | 757 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 758 | done: |
97397687 | 759 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
760 | return retval; |
761 | } | |
7a02264c | 762 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 763 | |
64f9477f | 764 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 765 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 766 | { |
7a7d9a89 | 767 | if (!q->streaming) |
19bc5133 BP |
768 | return -EINVAL; |
769 | ||
7a7d9a89 | 770 | videobuf_queue_cancel(q); |
7a7d9a89 | 771 | |
19bc5133 BP |
772 | return 0; |
773 | } | |
774 | ||
775 | int videobuf_streamoff(struct videobuf_queue *q) | |
776 | { | |
777 | int retval; | |
778 | ||
97397687 | 779 | videobuf_queue_lock(q); |
19bc5133 | 780 | retval = __videobuf_streamoff(q); |
97397687 | 781 | videobuf_queue_unlock(q); |
19bc5133 | 782 | |
7a7d9a89 MCC |
783 | return retval; |
784 | } | |
7a02264c | 785 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 786 | |
64f9477f | 787 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
788 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
789 | char __user *data, | |
790 | size_t count, loff_t *ppos) | |
791 | { | |
792 | enum v4l2_field field; | |
e2c77314 | 793 | unsigned long flags = 0; |
7a7d9a89 MCC |
794 | int retval; |
795 | ||
e2c77314 | 796 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
797 | |
798 | /* setup stuff */ | |
33c38283 | 799 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 MCC |
800 | if (NULL == q->read_buf) |
801 | return -ENOMEM; | |
802 | ||
803 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
804 | q->read_buf->baddr = (unsigned long)data; | |
805 | q->read_buf->bsize = count; | |
806 | ||
807 | field = videobuf_next_field(q); | |
e2c77314 | 808 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
809 | if (0 != retval) |
810 | goto done; | |
811 | ||
812 | /* start capture & wait */ | |
0cf4daee | 813 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 814 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 815 | spin_unlock_irqrestore(q->irqlock, flags); |
0e0809a5 | 816 | retval = videobuf_waiton(q, q->read_buf, 0, 0); |
7a7d9a89 | 817 | if (0 == retval) { |
e2c77314 | 818 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 819 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
820 | retval = -EIO; |
821 | else | |
822 | retval = q->read_buf->size; | |
823 | } | |
824 | ||
7a02264c | 825 | done: |
7a7d9a89 | 826 | /* cleanup */ |
e2c77314 | 827 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
828 | kfree(q->read_buf); |
829 | q->read_buf = NULL; | |
830 | return retval; | |
831 | } | |
832 | ||
37111039 HV |
833 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
834 | struct videobuf_buffer *buf, | |
835 | char __user *data, size_t count, | |
836 | int nonblocking) | |
837 | { | |
a8d54e4c | 838 | void *vaddr = CALLPTR(q, vaddr, buf); |
37111039 HV |
839 | |
840 | /* copy to userspace */ | |
841 | if (count > buf->size - q->read_off) | |
842 | count = buf->size - q->read_off; | |
843 | ||
844 | if (copy_to_user(data, vaddr + q->read_off, count)) | |
845 | return -EFAULT; | |
846 | ||
847 | return count; | |
848 | } | |
849 | ||
850 | static int __videobuf_copy_stream(struct videobuf_queue *q, | |
851 | struct videobuf_buffer *buf, | |
852 | char __user *data, size_t count, size_t pos, | |
853 | int vbihack, int nonblocking) | |
854 | { | |
a8d54e4c | 855 | unsigned int *fc = CALLPTR(q, vaddr, buf); |
37111039 HV |
856 | |
857 | if (vbihack) { | |
858 | /* dirty, undocumented hack -- pass the frame counter | |
859 | * within the last four bytes of each vbi data block. | |
860 | * We need that one to maintain backward compatibility | |
861 | * to all vbi decoding software out there ... */ | |
862 | fc += (buf->size >> 2) - 1; | |
863 | *fc = buf->field_count >> 1; | |
864 | dprintk(1, "vbihack: %d\n", *fc); | |
865 | } | |
866 | ||
867 | /* copy stuff using the common method */ | |
868 | count = __videobuf_copy_to_user(q, buf, data, count, nonblocking); | |
869 | ||
870 | if ((count == -EFAULT) && (pos == 0)) | |
871 | return -EFAULT; | |
872 | ||
873 | return count; | |
874 | } | |
875 | ||
7a7d9a89 MCC |
876 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
877 | char __user *data, size_t count, loff_t *ppos, | |
878 | int nonblocking) | |
879 | { | |
880 | enum v4l2_field field; | |
e2c77314 | 881 | unsigned long flags = 0; |
7daa4a88 | 882 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
883 | int retval; |
884 | ||
e2c77314 | 885 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 886 | |
97397687 | 887 | videobuf_queue_lock(q); |
7a7d9a89 | 888 | |
e2c77314 | 889 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
890 | |
891 | if (NULL == q->read_buf && | |
892 | count >= size && | |
893 | !nonblocking) { | |
e2c77314 | 894 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
895 | if (retval >= 0 || retval == -EIO) |
896 | /* ok, all done */ | |
897 | goto done; | |
898 | /* fallback to kernel bounce buffer on failures */ | |
899 | } | |
900 | ||
901 | if (NULL == q->read_buf) { | |
902 | /* need to capture a new frame */ | |
903 | retval = -ENOMEM; | |
33c38283 | 904 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 | 905 | |
e2c77314 | 906 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
907 | if (NULL == q->read_buf) |
908 | goto done; | |
909 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
910 | q->read_buf->bsize = count; /* preferred size */ | |
911 | field = videobuf_next_field(q); | |
e2c77314 | 912 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
913 | |
914 | if (0 != retval) { | |
e2c77314 | 915 | kfree(q->read_buf); |
7a7d9a89 MCC |
916 | q->read_buf = NULL; |
917 | goto done; | |
918 | } | |
7a7d9a89 | 919 | |
0cf4daee | 920 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 921 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
922 | spin_unlock_irqrestore(q->irqlock, flags); |
923 | ||
7a7d9a89 MCC |
924 | q->read_off = 0; |
925 | } | |
926 | ||
927 | /* wait until capture is done */ | |
0e0809a5 | 928 | retval = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
929 | if (0 != retval) |
930 | goto done; | |
931 | ||
e2c77314 | 932 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 933 | |
0fc0686e | 934 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 935 | /* catch I/O errors */ |
e2c77314 | 936 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
937 | kfree(q->read_buf); |
938 | q->read_buf = NULL; | |
939 | retval = -EIO; | |
940 | goto done; | |
941 | } | |
942 | ||
943 | /* Copy to userspace */ | |
37111039 | 944 | retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking); |
e2c77314 | 945 | if (retval < 0) |
7a7d9a89 MCC |
946 | goto done; |
947 | ||
948 | q->read_off += retval; | |
949 | if (q->read_off == q->read_buf->size) { | |
950 | /* all data copied, cleanup */ | |
e2c77314 | 951 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
952 | kfree(q->read_buf); |
953 | q->read_buf = NULL; | |
954 | } | |
955 | ||
7a02264c | 956 | done: |
97397687 | 957 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
958 | return retval; |
959 | } | |
7a02264c | 960 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 961 | |
64f9477f | 962 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 963 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
964 | { |
965 | enum v4l2_field field; | |
e2c77314 | 966 | unsigned long flags = 0; |
49ee718e | 967 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
968 | int err, i; |
969 | ||
e2c77314 | 970 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
971 | if (count < 2) |
972 | count = 2; | |
973 | if (count > VIDEO_MAX_FRAME) | |
974 | count = VIDEO_MAX_FRAME; | |
975 | size = PAGE_ALIGN(size); | |
976 | ||
19bc5133 | 977 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 978 | if (err < 0) |
7a7d9a89 MCC |
979 | return err; |
980 | ||
49ee718e BP |
981 | count = err; |
982 | ||
7a7d9a89 MCC |
983 | for (i = 0; i < count; i++) { |
984 | field = videobuf_next_field(q); | |
e2c77314 | 985 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
986 | if (err) |
987 | return err; | |
988 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
989 | } | |
0cf4daee | 990 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 991 | for (i = 0; i < count; i++) |
e2c77314 | 992 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 993 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
994 | q->reading = 1; |
995 | return 0; | |
996 | } | |
997 | ||
19bc5133 | 998 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
999 | { |
1000 | int i; | |
1001 | ||
1002 | videobuf_queue_cancel(q); | |
a438d6da | 1003 | __videobuf_free(q); |
7a7d9a89 MCC |
1004 | INIT_LIST_HEAD(&q->stream); |
1005 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
1006 | if (NULL == q->bufs[i]) | |
1007 | continue; | |
1008 | kfree(q->bufs[i]); | |
1009 | q->bufs[i] = NULL; | |
1010 | } | |
1011 | q->read_buf = NULL; | |
19bc5133 BP |
1012 | } |
1013 | ||
19fb1457 MCC |
1014 | int videobuf_read_start(struct videobuf_queue *q) |
1015 | { | |
1016 | int rc; | |
1017 | ||
97397687 | 1018 | videobuf_queue_lock(q); |
19fb1457 | 1019 | rc = __videobuf_read_start(q); |
97397687 | 1020 | videobuf_queue_unlock(q); |
19fb1457 MCC |
1021 | |
1022 | return rc; | |
1023 | } | |
7a02264c | 1024 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 1025 | |
19bc5133 BP |
1026 | void videobuf_read_stop(struct videobuf_queue *q) |
1027 | { | |
97397687 | 1028 | videobuf_queue_lock(q); |
19bc5133 | 1029 | __videobuf_read_stop(q); |
97397687 | 1030 | videobuf_queue_unlock(q); |
19bc5133 | 1031 | } |
7a02264c | 1032 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
1033 | |
1034 | void videobuf_stop(struct videobuf_queue *q) | |
1035 | { | |
97397687 | 1036 | videobuf_queue_lock(q); |
19bc5133 BP |
1037 | |
1038 | if (q->streaming) | |
1039 | __videobuf_streamoff(q); | |
1040 | ||
1041 | if (q->reading) | |
1042 | __videobuf_read_stop(q); | |
1043 | ||
97397687 | 1044 | videobuf_queue_unlock(q); |
7a7d9a89 | 1045 | } |
7a02264c | 1046 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 1047 | |
7a7d9a89 MCC |
1048 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
1049 | char __user *data, size_t count, loff_t *ppos, | |
1050 | int vbihack, int nonblocking) | |
1051 | { | |
1052 | int rc, retval; | |
e2c77314 | 1053 | unsigned long flags = 0; |
7a7d9a89 | 1054 | |
e2c77314 | 1055 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1056 | |
7e28adb2 | 1057 | dprintk(2, "%s\n", __func__); |
97397687 | 1058 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1059 | retval = -EBUSY; |
1060 | if (q->streaming) | |
1061 | goto done; | |
1062 | if (!q->reading) { | |
3f84307a | 1063 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
1064 | if (retval < 0) |
1065 | goto done; | |
1066 | } | |
1067 | ||
1068 | retval = 0; | |
1069 | while (count > 0) { | |
1070 | /* get / wait for data */ | |
1071 | if (NULL == q->read_buf) { | |
1072 | q->read_buf = list_entry(q->stream.next, | |
1073 | struct videobuf_buffer, | |
1074 | stream); | |
1075 | list_del(&q->read_buf->stream); | |
1076 | q->read_off = 0; | |
1077 | } | |
0e0809a5 | 1078 | rc = videobuf_waiton(q, q->read_buf, nonblocking, 1); |
7a7d9a89 MCC |
1079 | if (rc < 0) { |
1080 | if (0 == retval) | |
1081 | retval = rc; | |
1082 | break; | |
1083 | } | |
1084 | ||
0fc0686e | 1085 | if (q->read_buf->state == VIDEOBUF_DONE) { |
37111039 | 1086 | rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count, |
7a7d9a89 MCC |
1087 | retval, vbihack, nonblocking); |
1088 | if (rc < 0) { | |
1089 | retval = rc; | |
1090 | break; | |
1091 | } | |
1092 | retval += rc; | |
1093 | count -= rc; | |
1094 | q->read_off += rc; | |
1095 | } else { | |
1096 | /* some error */ | |
1097 | q->read_off = q->read_buf->size; | |
1098 | if (0 == retval) | |
1099 | retval = -EIO; | |
1100 | } | |
1101 | ||
1102 | /* requeue buffer when done with copying */ | |
1103 | if (q->read_off == q->read_buf->size) { | |
1104 | list_add_tail(&q->read_buf->stream, | |
1105 | &q->stream); | |
0cf4daee | 1106 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1107 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1108 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1109 | q->read_buf = NULL; |
1110 | } | |
1111 | if (retval < 0) | |
1112 | break; | |
1113 | } | |
1114 | ||
7a02264c | 1115 | done: |
97397687 | 1116 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1117 | return retval; |
1118 | } | |
7a02264c | 1119 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1120 | |
1121 | unsigned int videobuf_poll_stream(struct file *file, | |
1122 | struct videobuf_queue *q, | |
1123 | poll_table *wait) | |
1124 | { | |
0e17e9a9 | 1125 | unsigned long req_events = poll_requested_events(wait); |
7a7d9a89 MCC |
1126 | struct videobuf_buffer *buf = NULL; |
1127 | unsigned int rc = 0; | |
1128 | ||
97397687 | 1129 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1130 | if (q->streaming) { |
1131 | if (!list_empty(&q->stream)) | |
1132 | buf = list_entry(q->stream.next, | |
1133 | struct videobuf_buffer, stream); | |
0e17e9a9 | 1134 | } else if (req_events & (POLLIN | POLLRDNORM)) { |
7a7d9a89 | 1135 | if (!q->reading) |
3f84307a | 1136 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1137 | if (!q->reading) { |
1138 | rc = POLLERR; | |
1139 | } else if (NULL == q->read_buf) { | |
1140 | q->read_buf = list_entry(q->stream.next, | |
1141 | struct videobuf_buffer, | |
1142 | stream); | |
1143 | list_del(&q->read_buf->stream); | |
1144 | q->read_off = 0; | |
1145 | } | |
1146 | buf = q->read_buf; | |
1147 | } | |
1148 | if (!buf) | |
1149 | rc = POLLERR; | |
1150 | ||
1151 | if (0 == rc) { | |
1152 | poll_wait(file, &buf->done, wait); | |
0fc0686e | 1153 | if (buf->state == VIDEOBUF_DONE || |
9b558434 PO |
1154 | buf->state == VIDEOBUF_ERROR) { |
1155 | switch (q->type) { | |
1156 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
1157 | case V4L2_BUF_TYPE_VBI_OUTPUT: | |
1158 | case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: | |
9effc72f | 1159 | case V4L2_BUF_TYPE_SDR_OUTPUT: |
9b558434 PO |
1160 | rc = POLLOUT | POLLWRNORM; |
1161 | break; | |
1162 | default: | |
1163 | rc = POLLIN | POLLRDNORM; | |
1164 | break; | |
1165 | } | |
1166 | } | |
7a7d9a89 | 1167 | } |
97397687 | 1168 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1169 | return rc; |
1170 | } | |
7a02264c | 1171 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1172 | |
7a02264c | 1173 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 | 1174 | { |
0b62b737 HV |
1175 | int rc = -EINVAL; |
1176 | int i; | |
7a7d9a89 | 1177 | |
e2c77314 | 1178 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1179 | |
0b62b737 HV |
1180 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { |
1181 | dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); | |
1182 | return -EINVAL; | |
1183 | } | |
1184 | ||
97397687 | 1185 | videobuf_queue_lock(q); |
0b62b737 HV |
1186 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
1187 | struct videobuf_buffer *buf = q->bufs[i]; | |
1188 | ||
1189 | if (buf && buf->memory == V4L2_MEMORY_MMAP && | |
1190 | buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { | |
1191 | rc = CALL(q, mmap_mapper, q, buf, vma); | |
1192 | break; | |
1193 | } | |
1194 | } | |
97397687 | 1195 | videobuf_queue_unlock(q); |
7a7d9a89 | 1196 | |
0b62b737 | 1197 | return rc; |
7a7d9a89 | 1198 | } |
7a02264c | 1199 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |