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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) |
7a7d9a89 | 54 | |
a4cf4cac | 55 | struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q) |
7a7d9a89 MCC |
56 | { |
57 | struct videobuf_buffer *vb; | |
58 | ||
e2c77314 | 59 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 MCC |
60 | |
61 | if (!q->int_ops || !q->int_ops->alloc) { | |
62 | printk(KERN_ERR "No specific ops defined!\n"); | |
63 | BUG(); | |
64 | } | |
65 | ||
66 | vb = q->int_ops->alloc(q->msize); | |
7a7d9a89 MCC |
67 | if (NULL != vb) { |
68 | init_waitqueue_head(&vb->done); | |
7a02264c | 69 | vb->magic = MAGIC_BUFFER; |
7a7d9a89 MCC |
70 | } |
71 | ||
72 | return vb; | |
73 | } | |
7a02264c | 74 | EXPORT_SYMBOL_GPL(videobuf_alloc); |
7a7d9a89 | 75 | |
009a9059 BP |
76 | #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ |
77 | vb->state != VIDEOBUF_QUEUED) | |
7a7d9a89 MCC |
78 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
79 | { | |
e2c77314 | 80 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
009a9059 BP |
81 | |
82 | if (non_blocking) { | |
83 | if (WAITON_CONDITION) | |
84 | return 0; | |
85 | else | |
86 | return -EAGAIN; | |
7a7d9a89 | 87 | } |
009a9059 BP |
88 | |
89 | if (intr) | |
90 | return wait_event_interruptible(vb->done, WAITON_CONDITION); | |
91 | else | |
92 | wait_event(vb->done, WAITON_CONDITION); | |
93 | ||
94 | return 0; | |
7a7d9a89 | 95 | } |
7a02264c | 96 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
7a7d9a89 | 97 | |
e2c77314 | 98 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
7a7d9a89 MCC |
99 | struct v4l2_framebuffer *fbuf) |
100 | { | |
e2c77314 MCC |
101 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
102 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 | 103 | |
e2c77314 | 104 | return CALL(q, iolock, q, vb, fbuf); |
7a7d9a89 | 105 | } |
7a02264c | 106 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
7a7d9a89 | 107 | |
f4fce60e HV |
108 | void *videobuf_queue_to_vaddr(struct videobuf_queue *q, |
109 | struct videobuf_buffer *buf) | |
59d34489 | 110 | { |
037c75eb HV |
111 | if (q->int_ops->vaddr) |
112 | return q->int_ops->vaddr(buf); | |
f4fce60e | 113 | return NULL; |
59d34489 | 114 | } |
f4fce60e | 115 | EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr); |
59d34489 | 116 | |
7a7d9a89 MCC |
117 | /* --------------------------------------------------------------------- */ |
118 | ||
119 | ||
e2c77314 | 120 | void videobuf_queue_core_init(struct videobuf_queue *q, |
38a54f35 | 121 | const struct videobuf_queue_ops *ops, |
e9bcf667 | 122 | struct device *dev, |
7a7d9a89 MCC |
123 | spinlock_t *irqlock, |
124 | enum v4l2_buf_type type, | |
125 | enum v4l2_field field, | |
126 | unsigned int msize, | |
d4cae5a5 MCC |
127 | void *priv, |
128 | struct videobuf_qtype_ops *int_ops) | |
7a7d9a89 | 129 | { |
96ceea27 | 130 | BUG_ON(!q); |
e2c77314 | 131 | memset(q, 0, sizeof(*q)); |
d4cae5a5 MCC |
132 | q->irqlock = irqlock; |
133 | q->dev = dev; | |
134 | q->type = type; | |
135 | q->field = field; | |
136 | q->msize = msize; | |
137 | q->ops = ops; | |
7a7d9a89 | 138 | q->priv_data = priv; |
d4cae5a5 | 139 | q->int_ops = int_ops; |
7a7d9a89 MCC |
140 | |
141 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
142 | BUG_ON(!q->ops->buf_setup); |
143 | BUG_ON(!q->ops->buf_prepare); | |
144 | BUG_ON(!q->ops->buf_queue); | |
145 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 146 | |
0cf4daee BP |
147 | /* Lock is mandatory for queue_cancel to work */ |
148 | BUG_ON(!irqlock); | |
149 | ||
d4cae5a5 | 150 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 151 | BUG_ON(!q->int_ops); |
d4cae5a5 | 152 | |
64f9477f | 153 | mutex_init(&q->vb_lock); |
137d1cb1 | 154 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
155 | INIT_LIST_HEAD(&q->stream); |
156 | } | |
7a02264c | 157 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 158 | |
19bc5133 | 159 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
160 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
161 | { | |
162 | int i; | |
163 | ||
e2c77314 | 164 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
165 | |
166 | if (q->streaming) { | |
e2c77314 | 167 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
168 | return 1; |
169 | } | |
170 | if (q->reading) { | |
e2c77314 | 171 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
172 | return 1; |
173 | } | |
174 | if (q->read_buf) { | |
e2c77314 | 175 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
176 | return 1; |
177 | } | |
178 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
179 | if (NULL == q->bufs[i]) | |
180 | continue; | |
851c0c96 | 181 | if (q->bufs[i]->map) { |
e2c77314 | 182 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
183 | return 1; |
184 | } | |
0fc0686e | 185 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 186 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
187 | return 1; |
188 | } | |
0fc0686e | 189 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 190 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
191 | return 1; |
192 | } | |
193 | } | |
194 | return 0; | |
195 | } | |
7a02264c | 196 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 197 | |
64f9477f | 198 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
199 | void videobuf_queue_cancel(struct videobuf_queue *q) |
200 | { | |
e2c77314 | 201 | unsigned long flags = 0; |
7a7d9a89 MCC |
202 | int i; |
203 | ||
137d1cb1 BP |
204 | q->streaming = 0; |
205 | q->reading = 0; | |
206 | wake_up_interruptible_sync(&q->wait); | |
207 | ||
7a7d9a89 | 208 | /* remove queued buffers from list */ |
0cf4daee | 209 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
210 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
211 | if (NULL == q->bufs[i]) | |
212 | continue; | |
0fc0686e | 213 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 214 | list_del(&q->bufs[i]->queue); |
0fc0686e | 215 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 216 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
217 | } |
218 | } | |
0cf4daee | 219 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
220 | |
221 | /* free all buffers + clear queue */ | |
222 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
223 | if (NULL == q->bufs[i]) | |
224 | continue; | |
e2c77314 | 225 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
226 | } |
227 | INIT_LIST_HEAD(&q->stream); | |
228 | } | |
7a02264c | 229 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
230 | |
231 | /* --------------------------------------------------------------------- */ | |
232 | ||
64f9477f | 233 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
234 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
235 | { | |
236 | enum v4l2_field field = q->field; | |
237 | ||
238 | BUG_ON(V4L2_FIELD_ANY == field); | |
239 | ||
240 | if (V4L2_FIELD_ALTERNATE == field) { | |
241 | if (V4L2_FIELD_TOP == q->last) { | |
242 | field = V4L2_FIELD_BOTTOM; | |
243 | q->last = V4L2_FIELD_BOTTOM; | |
244 | } else { | |
245 | field = V4L2_FIELD_TOP; | |
246 | q->last = V4L2_FIELD_TOP; | |
247 | } | |
248 | } | |
249 | return field; | |
250 | } | |
7a02264c | 251 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 252 | |
64f9477f | 253 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
254 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
255 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
256 | { | |
e2c77314 MCC |
257 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
258 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
259 | |
260 | b->index = vb->i; | |
261 | b->type = type; | |
262 | ||
263 | b->memory = vb->memory; | |
264 | switch (b->memory) { | |
265 | case V4L2_MEMORY_MMAP: | |
266 | b->m.offset = vb->boff; | |
267 | b->length = vb->bsize; | |
268 | break; | |
269 | case V4L2_MEMORY_USERPTR: | |
270 | b->m.userptr = vb->baddr; | |
271 | b->length = vb->bsize; | |
272 | break; | |
273 | case V4L2_MEMORY_OVERLAY: | |
274 | b->m.offset = vb->boff; | |
275 | break; | |
276 | } | |
277 | ||
278 | b->flags = 0; | |
851c0c96 | 279 | if (vb->map) |
7a7d9a89 MCC |
280 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
281 | ||
282 | switch (vb->state) { | |
0fc0686e BP |
283 | case VIDEOBUF_PREPARED: |
284 | case VIDEOBUF_QUEUED: | |
285 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
286 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
287 | break; | |
0fc0686e BP |
288 | case VIDEOBUF_DONE: |
289 | case VIDEOBUF_ERROR: | |
7a7d9a89 MCC |
290 | b->flags |= V4L2_BUF_FLAG_DONE; |
291 | break; | |
0fc0686e BP |
292 | case VIDEOBUF_NEEDS_INIT: |
293 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
294 | /* nothing */ |
295 | break; | |
296 | } | |
297 | ||
298 | if (vb->input != UNSET) { | |
299 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
300 | b->input = vb->input; | |
301 | } | |
302 | ||
303 | b->field = vb->field; | |
304 | b->timestamp = vb->ts; | |
305 | b->bytesused = vb->size; | |
306 | b->sequence = vb->field_count >> 1; | |
307 | } | |
308 | ||
64f9477f | 309 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 BP |
310 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
311 | { | |
312 | int i; | |
19bc5133 BP |
313 | |
314 | if (!q) | |
315 | return 0; | |
316 | ||
e2c77314 | 317 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 318 | |
53aaf076 HV |
319 | for (i = 0; i < VIDEO_MAX_FRAME; i++) |
320 | if (q->bufs[i] && q->bufs[i]->map) | |
321 | return -EBUSY; | |
d05051c8 | 322 | |
19bc5133 BP |
323 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
324 | if (NULL == q->bufs[i]) | |
325 | continue; | |
e2c77314 | 326 | q->ops->buf_release(q, q->bufs[i]); |
19bc5133 BP |
327 | kfree(q->bufs[i]); |
328 | q->bufs[i] = NULL; | |
329 | } | |
330 | ||
53aaf076 | 331 | return 0; |
19bc5133 BP |
332 | } |
333 | ||
334 | int videobuf_mmap_free(struct videobuf_queue *q) | |
335 | { | |
336 | int ret; | |
64f9477f | 337 | mutex_lock(&q->vb_lock); |
19bc5133 | 338 | ret = __videobuf_mmap_free(q); |
64f9477f | 339 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
340 | return ret; |
341 | } | |
7a02264c | 342 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 343 | |
64f9477f | 344 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 345 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
346 | unsigned int bcount, unsigned int bsize, |
347 | enum v4l2_memory memory) | |
348 | { | |
349 | unsigned int i; | |
350 | int err; | |
351 | ||
e2c77314 | 352 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 BP |
353 | |
354 | err = __videobuf_mmap_free(q); | |
355 | if (0 != err) | |
356 | return err; | |
357 | ||
358 | /* Allocate and initialize buffers */ | |
359 | for (i = 0; i < bcount; i++) { | |
360 | q->bufs[i] = videobuf_alloc(q); | |
361 | ||
7a02264c | 362 | if (NULL == q->bufs[i]) |
19bc5133 BP |
363 | break; |
364 | ||
365 | q->bufs[i]->i = i; | |
366 | q->bufs[i]->input = UNSET; | |
367 | q->bufs[i]->memory = memory; | |
368 | q->bufs[i]->bsize = bsize; | |
369 | switch (memory) { | |
370 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 371 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
372 | break; |
373 | case V4L2_MEMORY_USERPTR: | |
374 | case V4L2_MEMORY_OVERLAY: | |
375 | /* nothing */ | |
376 | break; | |
377 | } | |
378 | } | |
379 | ||
380 | if (!i) | |
381 | return -ENOMEM; | |
382 | ||
7a02264c | 383 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
384 | |
385 | return i; | |
386 | } | |
7a02264c | 387 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
388 | |
389 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
390 | unsigned int bcount, unsigned int bsize, | |
391 | enum v4l2_memory memory) | |
392 | { | |
393 | int ret; | |
64f9477f | 394 | mutex_lock(&q->vb_lock); |
19bc5133 | 395 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
64f9477f | 396 | mutex_unlock(&q->vb_lock); |
19bc5133 BP |
397 | return ret; |
398 | } | |
7a02264c | 399 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 400 | |
7a7d9a89 MCC |
401 | int videobuf_reqbufs(struct videobuf_queue *q, |
402 | struct v4l2_requestbuffers *req) | |
403 | { | |
e2c77314 | 404 | unsigned int size, count; |
7a7d9a89 MCC |
405 | int retval; |
406 | ||
7a7d9a89 | 407 | if (req->count < 1) { |
e2c77314 | 408 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
409 | return -EINVAL; |
410 | } | |
19bc5133 | 411 | |
7a7d9a89 MCC |
412 | if (req->memory != V4L2_MEMORY_MMAP && |
413 | req->memory != V4L2_MEMORY_USERPTR && | |
414 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 415 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
416 | return -EINVAL; |
417 | } | |
418 | ||
64f9477f | 419 | mutex_lock(&q->vb_lock); |
19bc5133 | 420 | if (req->type != q->type) { |
e2c77314 | 421 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
422 | retval = -EINVAL; |
423 | goto done; | |
424 | } | |
425 | ||
7a7d9a89 | 426 | if (q->streaming) { |
e2c77314 | 427 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
428 | retval = -EBUSY; |
429 | goto done; | |
7a7d9a89 MCC |
430 | } |
431 | if (!list_empty(&q->stream)) { | |
e2c77314 | 432 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
433 | retval = -EBUSY; |
434 | goto done; | |
7a7d9a89 MCC |
435 | } |
436 | ||
7a7d9a89 MCC |
437 | count = req->count; |
438 | if (count > VIDEO_MAX_FRAME) | |
439 | count = VIDEO_MAX_FRAME; | |
440 | size = 0; | |
e2c77314 | 441 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
442 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
443 | count, size, | |
7a02264c | 444 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 445 | |
e2c77314 | 446 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 447 | if (retval < 0) { |
e2c77314 | 448 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
449 | goto done; |
450 | } | |
451 | ||
49ee718e | 452 | req->count = retval; |
925d74ae | 453 | retval = 0; |
7a7d9a89 MCC |
454 | |
455 | done: | |
64f9477f | 456 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
457 | return retval; |
458 | } | |
7a02264c | 459 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
460 | |
461 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
462 | { | |
19bc5133 BP |
463 | int ret = -EINVAL; |
464 | ||
64f9477f | 465 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 466 | if (unlikely(b->type != q->type)) { |
e2c77314 | 467 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 468 | goto done; |
7a7d9a89 | 469 | } |
223ffe5f | 470 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 471 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 472 | goto done; |
7a7d9a89 MCC |
473 | } |
474 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 475 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 476 | goto done; |
7a7d9a89 | 477 | } |
19bc5133 | 478 | |
e2c77314 | 479 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
480 | |
481 | ret = 0; | |
482 | done: | |
64f9477f | 483 | mutex_unlock(&q->vb_lock); |
19bc5133 | 484 | return ret; |
7a7d9a89 | 485 | } |
7a02264c | 486 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 487 | |
7a02264c | 488 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
489 | { |
490 | struct videobuf_buffer *buf; | |
491 | enum v4l2_field field; | |
e2c77314 | 492 | unsigned long flags = 0; |
7a7d9a89 MCC |
493 | int retval; |
494 | ||
e2c77314 | 495 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 496 | |
9900132f ML |
497 | if (b->memory == V4L2_MEMORY_MMAP) |
498 | down_read(¤t->mm->mmap_sem); | |
499 | ||
64f9477f | 500 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
501 | retval = -EBUSY; |
502 | if (q->reading) { | |
e2c77314 | 503 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
504 | goto done; |
505 | } | |
506 | retval = -EINVAL; | |
507 | if (b->type != q->type) { | |
e2c77314 | 508 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
509 | goto done; |
510 | } | |
223ffe5f | 511 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 512 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
513 | goto done; |
514 | } | |
515 | buf = q->bufs[b->index]; | |
516 | if (NULL == buf) { | |
e2c77314 | 517 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
518 | goto done; |
519 | } | |
e2c77314 | 520 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 521 | if (buf->memory != b->memory) { |
e2c77314 | 522 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
523 | goto done; |
524 | } | |
0fc0686e | 525 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 526 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
527 | goto done; |
528 | } | |
529 | ||
530 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
531 | if (b->input >= q->inputs) { | |
e2c77314 | 532 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
533 | goto done; |
534 | } | |
535 | buf->input = b->input; | |
536 | } else { | |
537 | buf->input = UNSET; | |
538 | } | |
539 | ||
540 | switch (b->memory) { | |
541 | case V4L2_MEMORY_MMAP: | |
542 | if (0 == buf->baddr) { | |
e2c77314 MCC |
543 | dprintk(1, "qbuf: mmap requested " |
544 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
545 | goto done; |
546 | } | |
547 | break; | |
548 | case V4L2_MEMORY_USERPTR: | |
549 | if (b->length < buf->bsize) { | |
e2c77314 | 550 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
551 | goto done; |
552 | } | |
e2c77314 MCC |
553 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
554 | buf->baddr != b->m.userptr) | |
555 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
556 | buf->baddr = b->m.userptr; |
557 | break; | |
558 | case V4L2_MEMORY_OVERLAY: | |
559 | buf->boff = b->m.offset; | |
560 | break; | |
561 | default: | |
e2c77314 | 562 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
563 | goto done; |
564 | } | |
565 | ||
e2c77314 | 566 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 567 | field = videobuf_next_field(q); |
e2c77314 | 568 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 569 | if (0 != retval) { |
e2c77314 | 570 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
571 | goto done; |
572 | } | |
573 | ||
e2c77314 | 574 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 575 | if (q->streaming) { |
0cf4daee | 576 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 577 | q->ops->buf_queue(q, buf); |
0cf4daee | 578 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 579 | } |
771075bb | 580 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 581 | retval = 0; |
137d1cb1 | 582 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 583 | |
7a02264c | 584 | done: |
64f9477f | 585 | mutex_unlock(&q->vb_lock); |
9900132f ML |
586 | |
587 | if (b->memory == V4L2_MEMORY_MMAP) | |
588 | up_read(¤t->mm->mmap_sem); | |
589 | ||
7a7d9a89 MCC |
590 | return retval; |
591 | } | |
7a02264c | 592 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
593 | |
594 | /* Locking: Caller holds q->vb_lock */ | |
595 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 596 | { |
7a7d9a89 MCC |
597 | int retval; |
598 | ||
137d1cb1 BP |
599 | checks: |
600 | if (!q->streaming) { | |
601 | dprintk(1, "next_buffer: Not streaming\n"); | |
602 | retval = -EINVAL; | |
7a7d9a89 MCC |
603 | goto done; |
604 | } | |
137d1cb1 | 605 | |
7a7d9a89 | 606 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
607 | if (noblock) { |
608 | retval = -EAGAIN; | |
609 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
610 | goto done; | |
611 | } else { | |
612 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
613 | ||
614 | /* Drop lock to avoid deadlock with qbuf */ | |
615 | mutex_unlock(&q->vb_lock); | |
616 | ||
617 | /* Checking list_empty and streaming is safe without | |
618 | * locks because we goto checks to validate while | |
619 | * holding locks before proceeding */ | |
620 | retval = wait_event_interruptible(q->wait, | |
621 | !list_empty(&q->stream) || !q->streaming); | |
622 | mutex_lock(&q->vb_lock); | |
623 | ||
624 | if (retval) | |
625 | goto done; | |
626 | ||
627 | goto checks; | |
628 | } | |
7a7d9a89 | 629 | } |
137d1cb1 BP |
630 | |
631 | retval = 0; | |
632 | ||
633 | done: | |
634 | return retval; | |
635 | } | |
636 | ||
137d1cb1 BP |
637 | /* Locking: Caller holds q->vb_lock */ |
638 | static int stream_next_buffer(struct videobuf_queue *q, | |
639 | struct videobuf_buffer **vb, int nonblocking) | |
640 | { | |
641 | int retval; | |
642 | struct videobuf_buffer *buf = NULL; | |
643 | ||
644 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
645 | if (retval) | |
646 | goto done; | |
647 | ||
7a7d9a89 MCC |
648 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
649 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
650 | if (retval < 0) |
651 | goto done; | |
652 | ||
653 | *vb = buf; | |
654 | done: | |
655 | return retval; | |
656 | } | |
657 | ||
658 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 659 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
660 | { |
661 | struct videobuf_buffer *buf = NULL; | |
662 | int retval; | |
663 | ||
664 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
665 | ||
e43d76b4 | 666 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
667 | |
668 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 669 | if (retval < 0) { |
137d1cb1 | 670 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
671 | goto done; |
672 | } | |
137d1cb1 | 673 | |
7a7d9a89 | 674 | switch (buf->state) { |
0fc0686e | 675 | case VIDEOBUF_ERROR: |
e2c77314 | 676 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 677 | retval = -EIO; |
e2c77314 | 678 | CALL(q, sync, q, buf); |
0fc0686e | 679 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 680 | break; |
0fc0686e | 681 | case VIDEOBUF_DONE: |
e2c77314 MCC |
682 | dprintk(1, "dqbuf: state is done\n"); |
683 | CALL(q, sync, q, buf); | |
0fc0686e | 684 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
685 | break; |
686 | default: | |
e2c77314 | 687 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
688 | retval = -EINVAL; |
689 | goto done; | |
690 | } | |
691 | list_del(&buf->stream); | |
e2c77314 MCC |
692 | memset(b, 0, sizeof(*b)); |
693 | videobuf_status(q, b, buf, q->type); | |
7a02264c | 694 | done: |
64f9477f | 695 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
696 | return retval; |
697 | } | |
7a02264c | 698 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
699 | |
700 | int videobuf_streamon(struct videobuf_queue *q) | |
701 | { | |
702 | struct videobuf_buffer *buf; | |
e2c77314 | 703 | unsigned long flags = 0; |
7a7d9a89 MCC |
704 | int retval; |
705 | ||
64f9477f | 706 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
707 | retval = -EBUSY; |
708 | if (q->reading) | |
709 | goto done; | |
710 | retval = 0; | |
711 | if (q->streaming) | |
712 | goto done; | |
713 | q->streaming = 1; | |
0cf4daee | 714 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 715 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 716 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 717 | q->ops->buf_queue(q, buf); |
0cf4daee | 718 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 719 | |
137d1cb1 | 720 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 721 | done: |
64f9477f | 722 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
723 | return retval; |
724 | } | |
7a02264c | 725 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 726 | |
64f9477f | 727 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 728 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 729 | { |
7a7d9a89 | 730 | if (!q->streaming) |
19bc5133 BP |
731 | return -EINVAL; |
732 | ||
7a7d9a89 | 733 | videobuf_queue_cancel(q); |
7a7d9a89 | 734 | |
19bc5133 BP |
735 | return 0; |
736 | } | |
737 | ||
738 | int videobuf_streamoff(struct videobuf_queue *q) | |
739 | { | |
740 | int retval; | |
741 | ||
64f9477f | 742 | mutex_lock(&q->vb_lock); |
19bc5133 | 743 | retval = __videobuf_streamoff(q); |
64f9477f | 744 | mutex_unlock(&q->vb_lock); |
19bc5133 | 745 | |
7a7d9a89 MCC |
746 | return retval; |
747 | } | |
7a02264c | 748 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 749 | |
64f9477f | 750 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
751 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
752 | char __user *data, | |
753 | size_t count, loff_t *ppos) | |
754 | { | |
755 | enum v4l2_field field; | |
e2c77314 | 756 | unsigned long flags = 0; |
7a7d9a89 MCC |
757 | int retval; |
758 | ||
e2c77314 | 759 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
760 | |
761 | /* setup stuff */ | |
762 | q->read_buf = videobuf_alloc(q); | |
763 | if (NULL == q->read_buf) | |
764 | return -ENOMEM; | |
765 | ||
766 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
767 | q->read_buf->baddr = (unsigned long)data; | |
768 | q->read_buf->bsize = count; | |
769 | ||
770 | field = videobuf_next_field(q); | |
e2c77314 | 771 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
772 | if (0 != retval) |
773 | goto done; | |
774 | ||
775 | /* start capture & wait */ | |
0cf4daee | 776 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 777 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 778 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 779 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 780 | if (0 == retval) { |
e2c77314 | 781 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 782 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
783 | retval = -EIO; |
784 | else | |
785 | retval = q->read_buf->size; | |
786 | } | |
787 | ||
7a02264c | 788 | done: |
7a7d9a89 | 789 | /* cleanup */ |
e2c77314 | 790 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
791 | kfree(q->read_buf); |
792 | q->read_buf = NULL; | |
793 | return retval; | |
794 | } | |
795 | ||
796 | ssize_t videobuf_read_one(struct videobuf_queue *q, | |
797 | char __user *data, size_t count, loff_t *ppos, | |
798 | int nonblocking) | |
799 | { | |
800 | enum v4l2_field field; | |
e2c77314 | 801 | unsigned long flags = 0; |
7daa4a88 | 802 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
803 | int retval; |
804 | ||
e2c77314 | 805 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 806 | |
64f9477f | 807 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 808 | |
e2c77314 | 809 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
810 | |
811 | if (NULL == q->read_buf && | |
812 | count >= size && | |
813 | !nonblocking) { | |
e2c77314 | 814 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
815 | if (retval >= 0 || retval == -EIO) |
816 | /* ok, all done */ | |
817 | goto done; | |
818 | /* fallback to kernel bounce buffer on failures */ | |
819 | } | |
820 | ||
821 | if (NULL == q->read_buf) { | |
822 | /* need to capture a new frame */ | |
823 | retval = -ENOMEM; | |
824 | q->read_buf = videobuf_alloc(q); | |
825 | ||
e2c77314 | 826 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
827 | if (NULL == q->read_buf) |
828 | goto done; | |
829 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
830 | q->read_buf->bsize = count; /* preferred size */ | |
831 | field = videobuf_next_field(q); | |
e2c77314 | 832 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
833 | |
834 | if (0 != retval) { | |
e2c77314 | 835 | kfree(q->read_buf); |
7a7d9a89 MCC |
836 | q->read_buf = NULL; |
837 | goto done; | |
838 | } | |
7a7d9a89 | 839 | |
0cf4daee | 840 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 841 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
842 | spin_unlock_irqrestore(q->irqlock, flags); |
843 | ||
7a7d9a89 MCC |
844 | q->read_off = 0; |
845 | } | |
846 | ||
847 | /* wait until capture is done */ | |
848 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
849 | if (0 != retval) | |
850 | goto done; | |
851 | ||
e2c77314 | 852 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 853 | |
0fc0686e | 854 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 855 | /* catch I/O errors */ |
e2c77314 | 856 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
857 | kfree(q->read_buf); |
858 | q->read_buf = NULL; | |
859 | retval = -EIO; | |
860 | goto done; | |
861 | } | |
862 | ||
863 | /* Copy to userspace */ | |
e2c77314 MCC |
864 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
865 | if (retval < 0) | |
7a7d9a89 MCC |
866 | goto done; |
867 | ||
868 | q->read_off += retval; | |
869 | if (q->read_off == q->read_buf->size) { | |
870 | /* all data copied, cleanup */ | |
e2c77314 | 871 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
872 | kfree(q->read_buf); |
873 | q->read_buf = NULL; | |
874 | } | |
875 | ||
7a02264c | 876 | done: |
64f9477f | 877 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
878 | return retval; |
879 | } | |
7a02264c | 880 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 881 | |
64f9477f | 882 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 883 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
884 | { |
885 | enum v4l2_field field; | |
e2c77314 | 886 | unsigned long flags = 0; |
49ee718e | 887 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
888 | int err, i; |
889 | ||
e2c77314 | 890 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
891 | if (count < 2) |
892 | count = 2; | |
893 | if (count > VIDEO_MAX_FRAME) | |
894 | count = VIDEO_MAX_FRAME; | |
895 | size = PAGE_ALIGN(size); | |
896 | ||
19bc5133 | 897 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 898 | if (err < 0) |
7a7d9a89 MCC |
899 | return err; |
900 | ||
49ee718e BP |
901 | count = err; |
902 | ||
7a7d9a89 MCC |
903 | for (i = 0; i < count; i++) { |
904 | field = videobuf_next_field(q); | |
e2c77314 | 905 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
906 | if (err) |
907 | return err; | |
908 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
909 | } | |
0cf4daee | 910 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 911 | for (i = 0; i < count; i++) |
e2c77314 | 912 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 913 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
914 | q->reading = 1; |
915 | return 0; | |
916 | } | |
917 | ||
19bc5133 | 918 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
919 | { |
920 | int i; | |
921 | ||
922 | videobuf_queue_cancel(q); | |
19bc5133 | 923 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
924 | INIT_LIST_HEAD(&q->stream); |
925 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
926 | if (NULL == q->bufs[i]) | |
927 | continue; | |
928 | kfree(q->bufs[i]); | |
929 | q->bufs[i] = NULL; | |
930 | } | |
931 | q->read_buf = NULL; | |
19bc5133 BP |
932 | } |
933 | ||
19fb1457 MCC |
934 | int videobuf_read_start(struct videobuf_queue *q) |
935 | { | |
936 | int rc; | |
937 | ||
64f9477f | 938 | mutex_lock(&q->vb_lock); |
19fb1457 | 939 | rc = __videobuf_read_start(q); |
64f9477f | 940 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
941 | |
942 | return rc; | |
943 | } | |
7a02264c | 944 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 945 | |
19bc5133 BP |
946 | void videobuf_read_stop(struct videobuf_queue *q) |
947 | { | |
64f9477f | 948 | mutex_lock(&q->vb_lock); |
19bc5133 | 949 | __videobuf_read_stop(q); |
64f9477f | 950 | mutex_unlock(&q->vb_lock); |
19bc5133 | 951 | } |
7a02264c | 952 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
953 | |
954 | void videobuf_stop(struct videobuf_queue *q) | |
955 | { | |
64f9477f | 956 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
957 | |
958 | if (q->streaming) | |
959 | __videobuf_streamoff(q); | |
960 | ||
961 | if (q->reading) | |
962 | __videobuf_read_stop(q); | |
963 | ||
64f9477f | 964 | mutex_unlock(&q->vb_lock); |
7a7d9a89 | 965 | } |
7a02264c | 966 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 967 | |
7a7d9a89 MCC |
968 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
969 | char __user *data, size_t count, loff_t *ppos, | |
970 | int vbihack, int nonblocking) | |
971 | { | |
972 | int rc, retval; | |
e2c77314 | 973 | unsigned long flags = 0; |
7a7d9a89 | 974 | |
e2c77314 | 975 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 976 | |
7e28adb2 | 977 | dprintk(2, "%s\n", __func__); |
64f9477f | 978 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
979 | retval = -EBUSY; |
980 | if (q->streaming) | |
981 | goto done; | |
982 | if (!q->reading) { | |
3f84307a | 983 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
984 | if (retval < 0) |
985 | goto done; | |
986 | } | |
987 | ||
988 | retval = 0; | |
989 | while (count > 0) { | |
990 | /* get / wait for data */ | |
991 | if (NULL == q->read_buf) { | |
992 | q->read_buf = list_entry(q->stream.next, | |
993 | struct videobuf_buffer, | |
994 | stream); | |
995 | list_del(&q->read_buf->stream); | |
996 | q->read_off = 0; | |
997 | } | |
998 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
999 | if (rc < 0) { | |
1000 | if (0 == retval) | |
1001 | retval = rc; | |
1002 | break; | |
1003 | } | |
1004 | ||
0fc0686e | 1005 | if (q->read_buf->state == VIDEOBUF_DONE) { |
e2c77314 | 1006 | rc = CALL(q, copy_stream, q, data + retval, count, |
7a7d9a89 MCC |
1007 | retval, vbihack, nonblocking); |
1008 | if (rc < 0) { | |
1009 | retval = rc; | |
1010 | break; | |
1011 | } | |
1012 | retval += rc; | |
1013 | count -= rc; | |
1014 | q->read_off += rc; | |
1015 | } else { | |
1016 | /* some error */ | |
1017 | q->read_off = q->read_buf->size; | |
1018 | if (0 == retval) | |
1019 | retval = -EIO; | |
1020 | } | |
1021 | ||
1022 | /* requeue buffer when done with copying */ | |
1023 | if (q->read_off == q->read_buf->size) { | |
1024 | list_add_tail(&q->read_buf->stream, | |
1025 | &q->stream); | |
0cf4daee | 1026 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1027 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1028 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1029 | q->read_buf = NULL; |
1030 | } | |
1031 | if (retval < 0) | |
1032 | break; | |
1033 | } | |
1034 | ||
7a02264c | 1035 | done: |
64f9477f | 1036 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1037 | return retval; |
1038 | } | |
7a02264c | 1039 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1040 | |
1041 | unsigned int videobuf_poll_stream(struct file *file, | |
1042 | struct videobuf_queue *q, | |
1043 | poll_table *wait) | |
1044 | { | |
1045 | struct videobuf_buffer *buf = NULL; | |
1046 | unsigned int rc = 0; | |
1047 | ||
64f9477f | 1048 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1049 | if (q->streaming) { |
1050 | if (!list_empty(&q->stream)) | |
1051 | buf = list_entry(q->stream.next, | |
1052 | struct videobuf_buffer, stream); | |
1053 | } else { | |
1054 | if (!q->reading) | |
3f84307a | 1055 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1056 | if (!q->reading) { |
1057 | rc = POLLERR; | |
1058 | } else if (NULL == q->read_buf) { | |
1059 | q->read_buf = list_entry(q->stream.next, | |
1060 | struct videobuf_buffer, | |
1061 | stream); | |
1062 | list_del(&q->read_buf->stream); | |
1063 | q->read_off = 0; | |
1064 | } | |
1065 | buf = q->read_buf; | |
1066 | } | |
1067 | if (!buf) | |
1068 | rc = POLLERR; | |
1069 | ||
1070 | if (0 == rc) { | |
1071 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1072 | if (buf->state == VIDEOBUF_DONE || |
1073 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1074 | rc = POLLIN|POLLRDNORM; |
1075 | } | |
64f9477f | 1076 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1077 | return rc; |
1078 | } | |
7a02264c | 1079 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1080 | |
7a02264c | 1081 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 MCC |
1082 | { |
1083 | int retval; | |
1084 | ||
e2c77314 | 1085 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1086 | |
64f9477f | 1087 | mutex_lock(&q->vb_lock); |
e2c77314 | 1088 | retval = CALL(q, mmap_mapper, q, vma); |
64f9477f | 1089 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1090 | |
1091 | return retval; | |
1092 | } | |
7a02264c | 1093 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
7a7d9a89 MCC |
1094 | |
1095 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1096 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1097 | struct video_mbuf *mbuf, int count) | |
1098 | { | |
1099 | struct v4l2_requestbuffers req; | |
e2c77314 | 1100 | int rc, i; |
7a7d9a89 | 1101 | |
e2c77314 | 1102 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1103 | |
e2c77314 | 1104 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1105 | req.type = q->type; |
1106 | req.count = count; | |
1107 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1108 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1109 | if (rc < 0) |
1110 | return rc; | |
1111 | ||
1112 | mbuf->frames = req.count; | |
1113 | mbuf->size = 0; | |
1114 | for (i = 0; i < mbuf->frames; i++) { | |
1115 | mbuf->offsets[i] = q->bufs[i]->boff; | |
7cbefad0 | 1116 | mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 MCC |
1117 | } |
1118 | ||
1119 | return 0; | |
1120 | } | |
a13625c5 | 1121 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1122 | #endif |
1123 |