Commit | Line | Data |
---|---|---|
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 | } | |
96f2ec67 PO |
547 | if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT |
548 | || q->type == V4L2_BUF_TYPE_VBI_OUTPUT | |
549 | || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) { | |
550 | buf->size = b->bytesused; | |
551 | buf->field = b->field; | |
552 | buf->ts = b->timestamp; | |
553 | } | |
7a7d9a89 MCC |
554 | break; |
555 | case V4L2_MEMORY_USERPTR: | |
556 | if (b->length < buf->bsize) { | |
e2c77314 | 557 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
558 | goto done; |
559 | } | |
e2c77314 MCC |
560 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
561 | buf->baddr != b->m.userptr) | |
562 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
563 | buf->baddr = b->m.userptr; |
564 | break; | |
565 | case V4L2_MEMORY_OVERLAY: | |
566 | buf->boff = b->m.offset; | |
567 | break; | |
568 | default: | |
e2c77314 | 569 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
570 | goto done; |
571 | } | |
572 | ||
e2c77314 | 573 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 574 | field = videobuf_next_field(q); |
e2c77314 | 575 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 576 | if (0 != retval) { |
e2c77314 | 577 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
578 | goto done; |
579 | } | |
580 | ||
e2c77314 | 581 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 582 | if (q->streaming) { |
0cf4daee | 583 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 584 | q->ops->buf_queue(q, buf); |
0cf4daee | 585 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 586 | } |
771075bb | 587 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 588 | retval = 0; |
137d1cb1 | 589 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 590 | |
7a02264c | 591 | done: |
64f9477f | 592 | mutex_unlock(&q->vb_lock); |
9900132f ML |
593 | |
594 | if (b->memory == V4L2_MEMORY_MMAP) | |
595 | up_read(¤t->mm->mmap_sem); | |
596 | ||
7a7d9a89 MCC |
597 | return retval; |
598 | } | |
7a02264c | 599 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
600 | |
601 | /* Locking: Caller holds q->vb_lock */ | |
602 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 603 | { |
7a7d9a89 MCC |
604 | int retval; |
605 | ||
137d1cb1 BP |
606 | checks: |
607 | if (!q->streaming) { | |
608 | dprintk(1, "next_buffer: Not streaming\n"); | |
609 | retval = -EINVAL; | |
7a7d9a89 MCC |
610 | goto done; |
611 | } | |
137d1cb1 | 612 | |
7a7d9a89 | 613 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
614 | if (noblock) { |
615 | retval = -EAGAIN; | |
616 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
617 | goto done; | |
618 | } else { | |
619 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
620 | ||
621 | /* Drop lock to avoid deadlock with qbuf */ | |
622 | mutex_unlock(&q->vb_lock); | |
623 | ||
624 | /* Checking list_empty and streaming is safe without | |
625 | * locks because we goto checks to validate while | |
626 | * holding locks before proceeding */ | |
627 | retval = wait_event_interruptible(q->wait, | |
628 | !list_empty(&q->stream) || !q->streaming); | |
629 | mutex_lock(&q->vb_lock); | |
630 | ||
631 | if (retval) | |
632 | goto done; | |
633 | ||
634 | goto checks; | |
635 | } | |
7a7d9a89 | 636 | } |
137d1cb1 BP |
637 | |
638 | retval = 0; | |
639 | ||
640 | done: | |
641 | return retval; | |
642 | } | |
643 | ||
137d1cb1 BP |
644 | /* Locking: Caller holds q->vb_lock */ |
645 | static int stream_next_buffer(struct videobuf_queue *q, | |
646 | struct videobuf_buffer **vb, int nonblocking) | |
647 | { | |
648 | int retval; | |
649 | struct videobuf_buffer *buf = NULL; | |
650 | ||
651 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
652 | if (retval) | |
653 | goto done; | |
654 | ||
7a7d9a89 MCC |
655 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
656 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
657 | if (retval < 0) |
658 | goto done; | |
659 | ||
660 | *vb = buf; | |
661 | done: | |
662 | return retval; | |
663 | } | |
664 | ||
665 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 666 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
667 | { |
668 | struct videobuf_buffer *buf = NULL; | |
669 | int retval; | |
670 | ||
671 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
672 | ||
e43d76b4 | 673 | mutex_lock(&q->vb_lock); |
137d1cb1 BP |
674 | |
675 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 676 | if (retval < 0) { |
137d1cb1 | 677 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
678 | goto done; |
679 | } | |
137d1cb1 | 680 | |
7a7d9a89 | 681 | switch (buf->state) { |
0fc0686e | 682 | case VIDEOBUF_ERROR: |
e2c77314 | 683 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 684 | retval = -EIO; |
e2c77314 | 685 | CALL(q, sync, q, buf); |
0fc0686e | 686 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 | 687 | break; |
0fc0686e | 688 | case VIDEOBUF_DONE: |
e2c77314 MCC |
689 | dprintk(1, "dqbuf: state is done\n"); |
690 | CALL(q, sync, q, buf); | |
0fc0686e | 691 | buf->state = VIDEOBUF_IDLE; |
7a7d9a89 MCC |
692 | break; |
693 | default: | |
e2c77314 | 694 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
695 | retval = -EINVAL; |
696 | goto done; | |
697 | } | |
698 | list_del(&buf->stream); | |
e2c77314 MCC |
699 | memset(b, 0, sizeof(*b)); |
700 | videobuf_status(q, b, buf, q->type); | |
7a02264c | 701 | done: |
64f9477f | 702 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
703 | return retval; |
704 | } | |
7a02264c | 705 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
706 | |
707 | int videobuf_streamon(struct videobuf_queue *q) | |
708 | { | |
709 | struct videobuf_buffer *buf; | |
e2c77314 | 710 | unsigned long flags = 0; |
7a7d9a89 MCC |
711 | int retval; |
712 | ||
64f9477f | 713 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
714 | retval = -EBUSY; |
715 | if (q->reading) | |
716 | goto done; | |
717 | retval = 0; | |
718 | if (q->streaming) | |
719 | goto done; | |
720 | q->streaming = 1; | |
0cf4daee | 721 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 722 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 723 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 724 | q->ops->buf_queue(q, buf); |
0cf4daee | 725 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 726 | |
137d1cb1 | 727 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 728 | done: |
64f9477f | 729 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
730 | return retval; |
731 | } | |
7a02264c | 732 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 733 | |
64f9477f | 734 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 735 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 736 | { |
7a7d9a89 | 737 | if (!q->streaming) |
19bc5133 BP |
738 | return -EINVAL; |
739 | ||
7a7d9a89 | 740 | videobuf_queue_cancel(q); |
7a7d9a89 | 741 | |
19bc5133 BP |
742 | return 0; |
743 | } | |
744 | ||
745 | int videobuf_streamoff(struct videobuf_queue *q) | |
746 | { | |
747 | int retval; | |
748 | ||
64f9477f | 749 | mutex_lock(&q->vb_lock); |
19bc5133 | 750 | retval = __videobuf_streamoff(q); |
64f9477f | 751 | mutex_unlock(&q->vb_lock); |
19bc5133 | 752 | |
7a7d9a89 MCC |
753 | return retval; |
754 | } | |
7a02264c | 755 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 756 | |
64f9477f | 757 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
758 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
759 | char __user *data, | |
760 | size_t count, loff_t *ppos) | |
761 | { | |
762 | enum v4l2_field field; | |
e2c77314 | 763 | unsigned long flags = 0; |
7a7d9a89 MCC |
764 | int retval; |
765 | ||
e2c77314 | 766 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
767 | |
768 | /* setup stuff */ | |
769 | q->read_buf = videobuf_alloc(q); | |
770 | if (NULL == q->read_buf) | |
771 | return -ENOMEM; | |
772 | ||
773 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
774 | q->read_buf->baddr = (unsigned long)data; | |
775 | q->read_buf->bsize = count; | |
776 | ||
777 | field = videobuf_next_field(q); | |
e2c77314 | 778 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
779 | if (0 != retval) |
780 | goto done; | |
781 | ||
782 | /* start capture & wait */ | |
0cf4daee | 783 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 784 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 785 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 786 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 787 | if (0 == retval) { |
e2c77314 | 788 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 789 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
790 | retval = -EIO; |
791 | else | |
792 | retval = q->read_buf->size; | |
793 | } | |
794 | ||
7a02264c | 795 | done: |
7a7d9a89 | 796 | /* cleanup */ |
e2c77314 | 797 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
798 | kfree(q->read_buf); |
799 | q->read_buf = NULL; | |
800 | return retval; | |
801 | } | |
802 | ||
37111039 HV |
803 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
804 | struct videobuf_buffer *buf, | |
805 | char __user *data, size_t count, | |
806 | int nonblocking) | |
807 | { | |
808 | void *vaddr = CALL(q, vaddr, buf); | |
809 | ||
810 | /* copy to userspace */ | |
811 | if (count > buf->size - q->read_off) | |
812 | count = buf->size - q->read_off; | |
813 | ||
814 | if (copy_to_user(data, vaddr + q->read_off, count)) | |
815 | return -EFAULT; | |
816 | ||
817 | return count; | |
818 | } | |
819 | ||
820 | static int __videobuf_copy_stream(struct videobuf_queue *q, | |
821 | struct videobuf_buffer *buf, | |
822 | char __user *data, size_t count, size_t pos, | |
823 | int vbihack, int nonblocking) | |
824 | { | |
825 | unsigned int *fc = CALL(q, vaddr, buf); | |
826 | ||
827 | if (vbihack) { | |
828 | /* dirty, undocumented hack -- pass the frame counter | |
829 | * within the last four bytes of each vbi data block. | |
830 | * We need that one to maintain backward compatibility | |
831 | * to all vbi decoding software out there ... */ | |
832 | fc += (buf->size >> 2) - 1; | |
833 | *fc = buf->field_count >> 1; | |
834 | dprintk(1, "vbihack: %d\n", *fc); | |
835 | } | |
836 | ||
837 | /* copy stuff using the common method */ | |
838 | count = __videobuf_copy_to_user(q, buf, data, count, nonblocking); | |
839 | ||
840 | if ((count == -EFAULT) && (pos == 0)) | |
841 | return -EFAULT; | |
842 | ||
843 | return count; | |
844 | } | |
845 | ||
7a7d9a89 MCC |
846 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
847 | char __user *data, size_t count, loff_t *ppos, | |
848 | int nonblocking) | |
849 | { | |
850 | enum v4l2_field field; | |
e2c77314 | 851 | unsigned long flags = 0; |
7daa4a88 | 852 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
853 | int retval; |
854 | ||
e2c77314 | 855 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 856 | |
64f9477f | 857 | mutex_lock(&q->vb_lock); |
7a7d9a89 | 858 | |
e2c77314 | 859 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
860 | |
861 | if (NULL == q->read_buf && | |
862 | count >= size && | |
863 | !nonblocking) { | |
e2c77314 | 864 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
865 | if (retval >= 0 || retval == -EIO) |
866 | /* ok, all done */ | |
867 | goto done; | |
868 | /* fallback to kernel bounce buffer on failures */ | |
869 | } | |
870 | ||
871 | if (NULL == q->read_buf) { | |
872 | /* need to capture a new frame */ | |
873 | retval = -ENOMEM; | |
874 | q->read_buf = videobuf_alloc(q); | |
875 | ||
e2c77314 | 876 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
877 | if (NULL == q->read_buf) |
878 | goto done; | |
879 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
880 | q->read_buf->bsize = count; /* preferred size */ | |
881 | field = videobuf_next_field(q); | |
e2c77314 | 882 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
883 | |
884 | if (0 != retval) { | |
e2c77314 | 885 | kfree(q->read_buf); |
7a7d9a89 MCC |
886 | q->read_buf = NULL; |
887 | goto done; | |
888 | } | |
7a7d9a89 | 889 | |
0cf4daee | 890 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 891 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
892 | spin_unlock_irqrestore(q->irqlock, flags); |
893 | ||
7a7d9a89 MCC |
894 | q->read_off = 0; |
895 | } | |
896 | ||
897 | /* wait until capture is done */ | |
898 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
899 | if (0 != retval) | |
900 | goto done; | |
901 | ||
e2c77314 | 902 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 903 | |
0fc0686e | 904 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 905 | /* catch I/O errors */ |
e2c77314 | 906 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
907 | kfree(q->read_buf); |
908 | q->read_buf = NULL; | |
909 | retval = -EIO; | |
910 | goto done; | |
911 | } | |
912 | ||
913 | /* Copy to userspace */ | |
37111039 | 914 | retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking); |
e2c77314 | 915 | if (retval < 0) |
7a7d9a89 MCC |
916 | goto done; |
917 | ||
918 | q->read_off += retval; | |
919 | if (q->read_off == q->read_buf->size) { | |
920 | /* all data copied, cleanup */ | |
e2c77314 | 921 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
922 | kfree(q->read_buf); |
923 | q->read_buf = NULL; | |
924 | } | |
925 | ||
7a02264c | 926 | done: |
64f9477f | 927 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
928 | return retval; |
929 | } | |
7a02264c | 930 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 931 | |
64f9477f | 932 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 933 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
934 | { |
935 | enum v4l2_field field; | |
e2c77314 | 936 | unsigned long flags = 0; |
49ee718e | 937 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
938 | int err, i; |
939 | ||
e2c77314 | 940 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
941 | if (count < 2) |
942 | count = 2; | |
943 | if (count > VIDEO_MAX_FRAME) | |
944 | count = VIDEO_MAX_FRAME; | |
945 | size = PAGE_ALIGN(size); | |
946 | ||
19bc5133 | 947 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 948 | if (err < 0) |
7a7d9a89 MCC |
949 | return err; |
950 | ||
49ee718e BP |
951 | count = err; |
952 | ||
7a7d9a89 MCC |
953 | for (i = 0; i < count; i++) { |
954 | field = videobuf_next_field(q); | |
e2c77314 | 955 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
956 | if (err) |
957 | return err; | |
958 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
959 | } | |
0cf4daee | 960 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 961 | for (i = 0; i < count; i++) |
e2c77314 | 962 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 963 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
964 | q->reading = 1; |
965 | return 0; | |
966 | } | |
967 | ||
19bc5133 | 968 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
969 | { |
970 | int i; | |
971 | ||
972 | videobuf_queue_cancel(q); | |
19bc5133 | 973 | __videobuf_mmap_free(q); |
7a7d9a89 MCC |
974 | INIT_LIST_HEAD(&q->stream); |
975 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
976 | if (NULL == q->bufs[i]) | |
977 | continue; | |
978 | kfree(q->bufs[i]); | |
979 | q->bufs[i] = NULL; | |
980 | } | |
981 | q->read_buf = NULL; | |
19bc5133 BP |
982 | } |
983 | ||
19fb1457 MCC |
984 | int videobuf_read_start(struct videobuf_queue *q) |
985 | { | |
986 | int rc; | |
987 | ||
64f9477f | 988 | mutex_lock(&q->vb_lock); |
19fb1457 | 989 | rc = __videobuf_read_start(q); |
64f9477f | 990 | mutex_unlock(&q->vb_lock); |
19fb1457 MCC |
991 | |
992 | return rc; | |
993 | } | |
7a02264c | 994 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 995 | |
19bc5133 BP |
996 | void videobuf_read_stop(struct videobuf_queue *q) |
997 | { | |
64f9477f | 998 | mutex_lock(&q->vb_lock); |
19bc5133 | 999 | __videobuf_read_stop(q); |
64f9477f | 1000 | mutex_unlock(&q->vb_lock); |
19bc5133 | 1001 | } |
7a02264c | 1002 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
1003 | |
1004 | void videobuf_stop(struct videobuf_queue *q) | |
1005 | { | |
64f9477f | 1006 | mutex_lock(&q->vb_lock); |
19bc5133 BP |
1007 | |
1008 | if (q->streaming) | |
1009 | __videobuf_streamoff(q); | |
1010 | ||
1011 | if (q->reading) | |
1012 | __videobuf_read_stop(q); | |
1013 | ||
64f9477f | 1014 | mutex_unlock(&q->vb_lock); |
7a7d9a89 | 1015 | } |
7a02264c | 1016 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 1017 | |
7a7d9a89 MCC |
1018 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
1019 | char __user *data, size_t count, loff_t *ppos, | |
1020 | int vbihack, int nonblocking) | |
1021 | { | |
1022 | int rc, retval; | |
e2c77314 | 1023 | unsigned long flags = 0; |
7a7d9a89 | 1024 | |
e2c77314 | 1025 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1026 | |
7e28adb2 | 1027 | dprintk(2, "%s\n", __func__); |
64f9477f | 1028 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1029 | retval = -EBUSY; |
1030 | if (q->streaming) | |
1031 | goto done; | |
1032 | if (!q->reading) { | |
3f84307a | 1033 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
1034 | if (retval < 0) |
1035 | goto done; | |
1036 | } | |
1037 | ||
1038 | retval = 0; | |
1039 | while (count > 0) { | |
1040 | /* get / wait for data */ | |
1041 | if (NULL == q->read_buf) { | |
1042 | q->read_buf = list_entry(q->stream.next, | |
1043 | struct videobuf_buffer, | |
1044 | stream); | |
1045 | list_del(&q->read_buf->stream); | |
1046 | q->read_off = 0; | |
1047 | } | |
1048 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
1049 | if (rc < 0) { | |
1050 | if (0 == retval) | |
1051 | retval = rc; | |
1052 | break; | |
1053 | } | |
1054 | ||
0fc0686e | 1055 | if (q->read_buf->state == VIDEOBUF_DONE) { |
37111039 | 1056 | rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count, |
7a7d9a89 MCC |
1057 | retval, vbihack, nonblocking); |
1058 | if (rc < 0) { | |
1059 | retval = rc; | |
1060 | break; | |
1061 | } | |
1062 | retval += rc; | |
1063 | count -= rc; | |
1064 | q->read_off += rc; | |
1065 | } else { | |
1066 | /* some error */ | |
1067 | q->read_off = q->read_buf->size; | |
1068 | if (0 == retval) | |
1069 | retval = -EIO; | |
1070 | } | |
1071 | ||
1072 | /* requeue buffer when done with copying */ | |
1073 | if (q->read_off == q->read_buf->size) { | |
1074 | list_add_tail(&q->read_buf->stream, | |
1075 | &q->stream); | |
0cf4daee | 1076 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1077 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1078 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1079 | q->read_buf = NULL; |
1080 | } | |
1081 | if (retval < 0) | |
1082 | break; | |
1083 | } | |
1084 | ||
7a02264c | 1085 | done: |
64f9477f | 1086 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1087 | return retval; |
1088 | } | |
7a02264c | 1089 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1090 | |
1091 | unsigned int videobuf_poll_stream(struct file *file, | |
1092 | struct videobuf_queue *q, | |
1093 | poll_table *wait) | |
1094 | { | |
1095 | struct videobuf_buffer *buf = NULL; | |
1096 | unsigned int rc = 0; | |
1097 | ||
64f9477f | 1098 | mutex_lock(&q->vb_lock); |
7a7d9a89 MCC |
1099 | if (q->streaming) { |
1100 | if (!list_empty(&q->stream)) | |
1101 | buf = list_entry(q->stream.next, | |
1102 | struct videobuf_buffer, stream); | |
1103 | } else { | |
1104 | if (!q->reading) | |
3f84307a | 1105 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1106 | if (!q->reading) { |
1107 | rc = POLLERR; | |
1108 | } else if (NULL == q->read_buf) { | |
1109 | q->read_buf = list_entry(q->stream.next, | |
1110 | struct videobuf_buffer, | |
1111 | stream); | |
1112 | list_del(&q->read_buf->stream); | |
1113 | q->read_off = 0; | |
1114 | } | |
1115 | buf = q->read_buf; | |
1116 | } | |
1117 | if (!buf) | |
1118 | rc = POLLERR; | |
1119 | ||
1120 | if (0 == rc) { | |
1121 | poll_wait(file, &buf->done, wait); | |
0fc0686e BP |
1122 | if (buf->state == VIDEOBUF_DONE || |
1123 | buf->state == VIDEOBUF_ERROR) | |
7a7d9a89 MCC |
1124 | rc = POLLIN|POLLRDNORM; |
1125 | } | |
64f9477f | 1126 | mutex_unlock(&q->vb_lock); |
7a7d9a89 MCC |
1127 | return rc; |
1128 | } | |
7a02264c | 1129 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1130 | |
7a02264c | 1131 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 | 1132 | { |
0b62b737 HV |
1133 | int rc = -EINVAL; |
1134 | int i; | |
7a7d9a89 | 1135 | |
e2c77314 | 1136 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1137 | |
0b62b737 HV |
1138 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { |
1139 | dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); | |
1140 | return -EINVAL; | |
1141 | } | |
1142 | ||
64f9477f | 1143 | mutex_lock(&q->vb_lock); |
0b62b737 HV |
1144 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
1145 | struct videobuf_buffer *buf = q->bufs[i]; | |
1146 | ||
1147 | if (buf && buf->memory == V4L2_MEMORY_MMAP && | |
1148 | buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { | |
1149 | rc = CALL(q, mmap_mapper, q, buf, vma); | |
1150 | break; | |
1151 | } | |
1152 | } | |
64f9477f | 1153 | mutex_unlock(&q->vb_lock); |
7a7d9a89 | 1154 | |
0b62b737 | 1155 | return rc; |
7a7d9a89 | 1156 | } |
7a02264c | 1157 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
7a7d9a89 MCC |
1158 | |
1159 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1160 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1161 | struct video_mbuf *mbuf, int count) | |
1162 | { | |
1163 | struct v4l2_requestbuffers req; | |
e2c77314 | 1164 | int rc, i; |
7a7d9a89 | 1165 | |
e2c77314 | 1166 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1167 | |
e2c77314 | 1168 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1169 | req.type = q->type; |
1170 | req.count = count; | |
1171 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1172 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1173 | if (rc < 0) |
1174 | return rc; | |
1175 | ||
1176 | mbuf->frames = req.count; | |
1177 | mbuf->size = 0; | |
1178 | for (i = 0; i < mbuf->frames; i++) { | |
1179 | mbuf->offsets[i] = q->bufs[i]->boff; | |
7cbefad0 | 1180 | mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 MCC |
1181 | } |
1182 | ||
1183 | return 0; | |
1184 | } | |
a13625c5 | 1185 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1186 | #endif |
1187 |