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 | |
33c38283 | 55 | struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q) |
7a7d9a89 MCC |
56 | { |
57 | struct videobuf_buffer *vb; | |
58 | ||
e2c77314 | 59 | BUG_ON(q->msize < sizeof(*vb)); |
7a7d9a89 | 60 | |
33c38283 | 61 | if (!q->int_ops || !q->int_ops->alloc_vb) { |
7a7d9a89 MCC |
62 | printk(KERN_ERR "No specific ops defined!\n"); |
63 | BUG(); | |
64 | } | |
65 | ||
33c38283 | 66 | vb = q->int_ops->alloc_vb(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 | } | |
33c38283 | 74 | EXPORT_SYMBOL_GPL(videobuf_alloc_vb); |
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 | 127 | void *priv, |
08bff03e HV |
128 | struct videobuf_qtype_ops *int_ops, |
129 | struct mutex *ext_lock) | |
7a7d9a89 | 130 | { |
96ceea27 | 131 | BUG_ON(!q); |
e2c77314 | 132 | memset(q, 0, sizeof(*q)); |
d4cae5a5 | 133 | q->irqlock = irqlock; |
08bff03e | 134 | q->ext_lock = ext_lock; |
d4cae5a5 MCC |
135 | q->dev = dev; |
136 | q->type = type; | |
137 | q->field = field; | |
138 | q->msize = msize; | |
139 | q->ops = ops; | |
7a7d9a89 | 140 | q->priv_data = priv; |
d4cae5a5 | 141 | q->int_ops = int_ops; |
7a7d9a89 MCC |
142 | |
143 | /* All buffer operations are mandatory */ | |
e2c77314 MCC |
144 | BUG_ON(!q->ops->buf_setup); |
145 | BUG_ON(!q->ops->buf_prepare); | |
146 | BUG_ON(!q->ops->buf_queue); | |
147 | BUG_ON(!q->ops->buf_release); | |
7a7d9a89 | 148 | |
0cf4daee BP |
149 | /* Lock is mandatory for queue_cancel to work */ |
150 | BUG_ON(!irqlock); | |
151 | ||
d4cae5a5 | 152 | /* Having implementations for abstract methods are mandatory */ |
e2c77314 | 153 | BUG_ON(!q->int_ops); |
d4cae5a5 | 154 | |
64f9477f | 155 | mutex_init(&q->vb_lock); |
137d1cb1 | 156 | init_waitqueue_head(&q->wait); |
7a7d9a89 MCC |
157 | INIT_LIST_HEAD(&q->stream); |
158 | } | |
7a02264c | 159 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
7a7d9a89 | 160 | |
19bc5133 | 161 | /* Locking: Only usage in bttv unsafe find way to remove */ |
7a7d9a89 MCC |
162 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
163 | { | |
164 | int i; | |
165 | ||
e2c77314 | 166 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
167 | |
168 | if (q->streaming) { | |
e2c77314 | 169 | dprintk(1, "busy: streaming active\n"); |
7a7d9a89 MCC |
170 | return 1; |
171 | } | |
172 | if (q->reading) { | |
e2c77314 | 173 | dprintk(1, "busy: pending read #1\n"); |
7a7d9a89 MCC |
174 | return 1; |
175 | } | |
176 | if (q->read_buf) { | |
e2c77314 | 177 | dprintk(1, "busy: pending read #2\n"); |
7a7d9a89 MCC |
178 | return 1; |
179 | } | |
180 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
181 | if (NULL == q->bufs[i]) | |
182 | continue; | |
851c0c96 | 183 | if (q->bufs[i]->map) { |
e2c77314 | 184 | dprintk(1, "busy: buffer #%d mapped\n", i); |
7a7d9a89 MCC |
185 | return 1; |
186 | } | |
0fc0686e | 187 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
e2c77314 | 188 | dprintk(1, "busy: buffer #%d queued\n", i); |
7a7d9a89 MCC |
189 | return 1; |
190 | } | |
0fc0686e | 191 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
e2c77314 | 192 | dprintk(1, "busy: buffer #%d avtive\n", i); |
7a7d9a89 MCC |
193 | return 1; |
194 | } | |
195 | } | |
196 | return 0; | |
197 | } | |
7a02264c | 198 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
7a7d9a89 | 199 | |
a438d6da PO |
200 | /** |
201 | * __videobuf_free() - free all the buffers and their control structures | |
202 | * | |
203 | * This function can only be called if streaming/reading is off, i.e. no buffers | |
204 | * are under control of the driver. | |
205 | */ | |
206 | /* Locking: Caller holds q->vb_lock */ | |
207 | static int __videobuf_free(struct videobuf_queue *q) | |
208 | { | |
209 | int i; | |
210 | ||
211 | dprintk(1, "%s\n", __func__); | |
212 | if (!q) | |
213 | return 0; | |
214 | ||
215 | if (q->streaming || q->reading) { | |
216 | dprintk(1, "Cannot free buffers when streaming or reading\n"); | |
217 | return -EBUSY; | |
218 | } | |
219 | ||
220 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
221 | ||
222 | for (i = 0; i < VIDEO_MAX_FRAME; i++) | |
223 | if (q->bufs[i] && q->bufs[i]->map) { | |
224 | dprintk(1, "Cannot free mmapped buffers\n"); | |
225 | return -EBUSY; | |
226 | } | |
227 | ||
228 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
229 | if (NULL == q->bufs[i]) | |
230 | continue; | |
231 | q->ops->buf_release(q, q->bufs[i]); | |
232 | kfree(q->bufs[i]); | |
233 | q->bufs[i] = NULL; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
64f9477f | 239 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
240 | void videobuf_queue_cancel(struct videobuf_queue *q) |
241 | { | |
e2c77314 | 242 | unsigned long flags = 0; |
7a7d9a89 MCC |
243 | int i; |
244 | ||
137d1cb1 BP |
245 | q->streaming = 0; |
246 | q->reading = 0; | |
247 | wake_up_interruptible_sync(&q->wait); | |
248 | ||
7a7d9a89 | 249 | /* remove queued buffers from list */ |
0cf4daee | 250 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 MCC |
251 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
252 | if (NULL == q->bufs[i]) | |
253 | continue; | |
0fc0686e | 254 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
7a7d9a89 | 255 | list_del(&q->bufs[i]->queue); |
0fc0686e | 256 | q->bufs[i]->state = VIDEOBUF_ERROR; |
b608f432 | 257 | wake_up_all(&q->bufs[i]->done); |
7a7d9a89 MCC |
258 | } |
259 | } | |
0cf4daee | 260 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
261 | |
262 | /* free all buffers + clear queue */ | |
263 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
264 | if (NULL == q->bufs[i]) | |
265 | continue; | |
e2c77314 | 266 | q->ops->buf_release(q, q->bufs[i]); |
7a7d9a89 MCC |
267 | } |
268 | INIT_LIST_HEAD(&q->stream); | |
269 | } | |
7a02264c | 270 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
7a7d9a89 MCC |
271 | |
272 | /* --------------------------------------------------------------------- */ | |
273 | ||
64f9477f | 274 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
275 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
276 | { | |
277 | enum v4l2_field field = q->field; | |
278 | ||
279 | BUG_ON(V4L2_FIELD_ANY == field); | |
280 | ||
281 | if (V4L2_FIELD_ALTERNATE == field) { | |
282 | if (V4L2_FIELD_TOP == q->last) { | |
283 | field = V4L2_FIELD_BOTTOM; | |
284 | q->last = V4L2_FIELD_BOTTOM; | |
285 | } else { | |
286 | field = V4L2_FIELD_TOP; | |
287 | q->last = V4L2_FIELD_TOP; | |
288 | } | |
289 | } | |
290 | return field; | |
291 | } | |
7a02264c | 292 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
7a7d9a89 | 293 | |
64f9477f | 294 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
295 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
296 | struct videobuf_buffer *vb, enum v4l2_buf_type type) | |
297 | { | |
e2c77314 MCC |
298 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
299 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
7a7d9a89 MCC |
300 | |
301 | b->index = vb->i; | |
302 | b->type = type; | |
303 | ||
304 | b->memory = vb->memory; | |
305 | switch (b->memory) { | |
306 | case V4L2_MEMORY_MMAP: | |
307 | b->m.offset = vb->boff; | |
308 | b->length = vb->bsize; | |
309 | break; | |
310 | case V4L2_MEMORY_USERPTR: | |
311 | b->m.userptr = vb->baddr; | |
312 | b->length = vb->bsize; | |
313 | break; | |
314 | case V4L2_MEMORY_OVERLAY: | |
315 | b->m.offset = vb->boff; | |
316 | break; | |
317 | } | |
318 | ||
319 | b->flags = 0; | |
851c0c96 | 320 | if (vb->map) |
7a7d9a89 MCC |
321 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
322 | ||
323 | switch (vb->state) { | |
0fc0686e BP |
324 | case VIDEOBUF_PREPARED: |
325 | case VIDEOBUF_QUEUED: | |
326 | case VIDEOBUF_ACTIVE: | |
7a7d9a89 MCC |
327 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
328 | break; | |
0fc0686e | 329 | case VIDEOBUF_ERROR: |
b2dfd1a4 HV |
330 | b->flags |= V4L2_BUF_FLAG_ERROR; |
331 | /* fall through */ | |
332 | case VIDEOBUF_DONE: | |
7a7d9a89 MCC |
333 | b->flags |= V4L2_BUF_FLAG_DONE; |
334 | break; | |
0fc0686e BP |
335 | case VIDEOBUF_NEEDS_INIT: |
336 | case VIDEOBUF_IDLE: | |
7a7d9a89 MCC |
337 | /* nothing */ |
338 | break; | |
339 | } | |
340 | ||
341 | if (vb->input != UNSET) { | |
342 | b->flags |= V4L2_BUF_FLAG_INPUT; | |
343 | b->input = vb->input; | |
344 | } | |
345 | ||
346 | b->field = vb->field; | |
347 | b->timestamp = vb->ts; | |
348 | b->bytesused = vb->size; | |
349 | b->sequence = vb->field_count >> 1; | |
350 | } | |
351 | ||
19bc5133 BP |
352 | int videobuf_mmap_free(struct videobuf_queue *q) |
353 | { | |
354 | int ret; | |
97397687 | 355 | videobuf_queue_lock(q); |
a438d6da | 356 | ret = __videobuf_free(q); |
97397687 | 357 | videobuf_queue_unlock(q); |
19bc5133 BP |
358 | return ret; |
359 | } | |
7a02264c | 360 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
19bc5133 | 361 | |
64f9477f | 362 | /* Locking: Caller holds q->vb_lock */ |
81b2dbca | 363 | int __videobuf_mmap_setup(struct videobuf_queue *q, |
19bc5133 BP |
364 | unsigned int bcount, unsigned int bsize, |
365 | enum v4l2_memory memory) | |
366 | { | |
367 | unsigned int i; | |
368 | int err; | |
369 | ||
e2c77314 | 370 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
19bc5133 | 371 | |
a438d6da | 372 | err = __videobuf_free(q); |
19bc5133 BP |
373 | if (0 != err) |
374 | return err; | |
375 | ||
376 | /* Allocate and initialize buffers */ | |
377 | for (i = 0; i < bcount; i++) { | |
33c38283 | 378 | q->bufs[i] = videobuf_alloc_vb(q); |
19bc5133 | 379 | |
7a02264c | 380 | if (NULL == q->bufs[i]) |
19bc5133 BP |
381 | break; |
382 | ||
383 | q->bufs[i]->i = i; | |
384 | q->bufs[i]->input = UNSET; | |
385 | q->bufs[i]->memory = memory; | |
386 | q->bufs[i]->bsize = bsize; | |
387 | switch (memory) { | |
388 | case V4L2_MEMORY_MMAP: | |
7cbefad0 | 389 | q->bufs[i]->boff = PAGE_ALIGN(bsize) * i; |
19bc5133 BP |
390 | break; |
391 | case V4L2_MEMORY_USERPTR: | |
392 | case V4L2_MEMORY_OVERLAY: | |
393 | /* nothing */ | |
394 | break; | |
395 | } | |
396 | } | |
397 | ||
398 | if (!i) | |
399 | return -ENOMEM; | |
400 | ||
7a02264c | 401 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize); |
19bc5133 BP |
402 | |
403 | return i; | |
404 | } | |
7a02264c | 405 | EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); |
19bc5133 BP |
406 | |
407 | int videobuf_mmap_setup(struct videobuf_queue *q, | |
408 | unsigned int bcount, unsigned int bsize, | |
409 | enum v4l2_memory memory) | |
410 | { | |
411 | int ret; | |
97397687 | 412 | videobuf_queue_lock(q); |
19bc5133 | 413 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
97397687 | 414 | videobuf_queue_unlock(q); |
19bc5133 BP |
415 | return ret; |
416 | } | |
7a02264c | 417 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
19bc5133 | 418 | |
7a7d9a89 MCC |
419 | int videobuf_reqbufs(struct videobuf_queue *q, |
420 | struct v4l2_requestbuffers *req) | |
421 | { | |
e2c77314 | 422 | unsigned int size, count; |
7a7d9a89 MCC |
423 | int retval; |
424 | ||
7a7d9a89 | 425 | if (req->count < 1) { |
e2c77314 | 426 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
7a7d9a89 MCC |
427 | return -EINVAL; |
428 | } | |
19bc5133 | 429 | |
7a7d9a89 MCC |
430 | if (req->memory != V4L2_MEMORY_MMAP && |
431 | req->memory != V4L2_MEMORY_USERPTR && | |
432 | req->memory != V4L2_MEMORY_OVERLAY) { | |
e2c77314 | 433 | dprintk(1, "reqbufs: memory type invalid\n"); |
7a7d9a89 MCC |
434 | return -EINVAL; |
435 | } | |
436 | ||
97397687 | 437 | videobuf_queue_lock(q); |
19bc5133 | 438 | if (req->type != q->type) { |
e2c77314 | 439 | dprintk(1, "reqbufs: queue type invalid\n"); |
19bc5133 BP |
440 | retval = -EINVAL; |
441 | goto done; | |
442 | } | |
443 | ||
7a7d9a89 | 444 | if (q->streaming) { |
e2c77314 | 445 | dprintk(1, "reqbufs: streaming already exists\n"); |
00f98d08 BP |
446 | retval = -EBUSY; |
447 | goto done; | |
7a7d9a89 MCC |
448 | } |
449 | if (!list_empty(&q->stream)) { | |
e2c77314 | 450 | dprintk(1, "reqbufs: stream running\n"); |
00f98d08 BP |
451 | retval = -EBUSY; |
452 | goto done; | |
7a7d9a89 MCC |
453 | } |
454 | ||
7a7d9a89 MCC |
455 | count = req->count; |
456 | if (count > VIDEO_MAX_FRAME) | |
457 | count = VIDEO_MAX_FRAME; | |
458 | size = 0; | |
e2c77314 | 459 | q->ops->buf_setup(q, &count, &size); |
296372e3 MN |
460 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n", |
461 | count, size, | |
7a02264c | 462 | (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT)); |
7a7d9a89 | 463 | |
e2c77314 | 464 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
7a7d9a89 | 465 | if (retval < 0) { |
e2c77314 | 466 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
7a7d9a89 MCC |
467 | goto done; |
468 | } | |
469 | ||
49ee718e | 470 | req->count = retval; |
925d74ae | 471 | retval = 0; |
7a7d9a89 MCC |
472 | |
473 | done: | |
97397687 | 474 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
475 | return retval; |
476 | } | |
7a02264c | 477 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
7a7d9a89 MCC |
478 | |
479 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) | |
480 | { | |
19bc5133 BP |
481 | int ret = -EINVAL; |
482 | ||
97397687 | 483 | videobuf_queue_lock(q); |
7a7d9a89 | 484 | if (unlikely(b->type != q->type)) { |
e2c77314 | 485 | dprintk(1, "querybuf: Wrong type.\n"); |
19bc5133 | 486 | goto done; |
7a7d9a89 | 487 | } |
223ffe5f | 488 | if (unlikely(b->index >= VIDEO_MAX_FRAME)) { |
e2c77314 | 489 | dprintk(1, "querybuf: index out of range.\n"); |
19bc5133 | 490 | goto done; |
7a7d9a89 MCC |
491 | } |
492 | if (unlikely(NULL == q->bufs[b->index])) { | |
e2c77314 | 493 | dprintk(1, "querybuf: buffer is null.\n"); |
19bc5133 | 494 | goto done; |
7a7d9a89 | 495 | } |
19bc5133 | 496 | |
e2c77314 | 497 | videobuf_status(q, b, q->bufs[b->index], q->type); |
19bc5133 BP |
498 | |
499 | ret = 0; | |
500 | done: | |
97397687 | 501 | videobuf_queue_unlock(q); |
19bc5133 | 502 | return ret; |
7a7d9a89 | 503 | } |
7a02264c | 504 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
7a7d9a89 | 505 | |
7a02264c | 506 | int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
7a7d9a89 MCC |
507 | { |
508 | struct videobuf_buffer *buf; | |
509 | enum v4l2_field field; | |
e2c77314 | 510 | unsigned long flags = 0; |
7a7d9a89 MCC |
511 | int retval; |
512 | ||
e2c77314 | 513 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 514 | |
9900132f ML |
515 | if (b->memory == V4L2_MEMORY_MMAP) |
516 | down_read(¤t->mm->mmap_sem); | |
517 | ||
97397687 | 518 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
519 | retval = -EBUSY; |
520 | if (q->reading) { | |
e2c77314 | 521 | dprintk(1, "qbuf: Reading running...\n"); |
7a7d9a89 MCC |
522 | goto done; |
523 | } | |
524 | retval = -EINVAL; | |
525 | if (b->type != q->type) { | |
e2c77314 | 526 | dprintk(1, "qbuf: Wrong type.\n"); |
7a7d9a89 MCC |
527 | goto done; |
528 | } | |
223ffe5f | 529 | if (b->index >= VIDEO_MAX_FRAME) { |
e2c77314 | 530 | dprintk(1, "qbuf: index out of range.\n"); |
7a7d9a89 MCC |
531 | goto done; |
532 | } | |
533 | buf = q->bufs[b->index]; | |
534 | if (NULL == buf) { | |
e2c77314 | 535 | dprintk(1, "qbuf: buffer is null.\n"); |
7a7d9a89 MCC |
536 | goto done; |
537 | } | |
e2c77314 | 538 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
7a7d9a89 | 539 | if (buf->memory != b->memory) { |
e2c77314 | 540 | dprintk(1, "qbuf: memory type is wrong.\n"); |
7a7d9a89 MCC |
541 | goto done; |
542 | } | |
0fc0686e | 543 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
e2c77314 | 544 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
7a7d9a89 MCC |
545 | goto done; |
546 | } | |
547 | ||
548 | if (b->flags & V4L2_BUF_FLAG_INPUT) { | |
549 | if (b->input >= q->inputs) { | |
e2c77314 | 550 | dprintk(1, "qbuf: wrong input.\n"); |
7a7d9a89 MCC |
551 | goto done; |
552 | } | |
553 | buf->input = b->input; | |
554 | } else { | |
555 | buf->input = UNSET; | |
556 | } | |
557 | ||
558 | switch (b->memory) { | |
559 | case V4L2_MEMORY_MMAP: | |
560 | if (0 == buf->baddr) { | |
e2c77314 MCC |
561 | dprintk(1, "qbuf: mmap requested " |
562 | "but buffer addr is zero!\n"); | |
7a7d9a89 MCC |
563 | goto done; |
564 | } | |
96f2ec67 PO |
565 | if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT |
566 | || q->type == V4L2_BUF_TYPE_VBI_OUTPUT | |
567 | || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) { | |
568 | buf->size = b->bytesused; | |
569 | buf->field = b->field; | |
570 | buf->ts = b->timestamp; | |
571 | } | |
7a7d9a89 MCC |
572 | break; |
573 | case V4L2_MEMORY_USERPTR: | |
574 | if (b->length < buf->bsize) { | |
e2c77314 | 575 | dprintk(1, "qbuf: buffer length is not enough\n"); |
7a7d9a89 MCC |
576 | goto done; |
577 | } | |
e2c77314 MCC |
578 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
579 | buf->baddr != b->m.userptr) | |
580 | q->ops->buf_release(q, buf); | |
7a7d9a89 MCC |
581 | buf->baddr = b->m.userptr; |
582 | break; | |
583 | case V4L2_MEMORY_OVERLAY: | |
584 | buf->boff = b->m.offset; | |
585 | break; | |
586 | default: | |
e2c77314 | 587 | dprintk(1, "qbuf: wrong memory type\n"); |
7a7d9a89 MCC |
588 | goto done; |
589 | } | |
590 | ||
e2c77314 | 591 | dprintk(1, "qbuf: requesting next field\n"); |
7a7d9a89 | 592 | field = videobuf_next_field(q); |
e2c77314 | 593 | retval = q->ops->buf_prepare(q, buf, field); |
7a7d9a89 | 594 | if (0 != retval) { |
e2c77314 | 595 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
7a7d9a89 MCC |
596 | goto done; |
597 | } | |
598 | ||
e2c77314 | 599 | list_add_tail(&buf->stream, &q->stream); |
7a7d9a89 | 600 | if (q->streaming) { |
0cf4daee | 601 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 602 | q->ops->buf_queue(q, buf); |
0cf4daee | 603 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 604 | } |
771075bb | 605 | dprintk(1, "qbuf: succeeded\n"); |
7a7d9a89 | 606 | retval = 0; |
137d1cb1 | 607 | wake_up_interruptible_sync(&q->wait); |
7a7d9a89 | 608 | |
7a02264c | 609 | done: |
97397687 | 610 | videobuf_queue_unlock(q); |
9900132f ML |
611 | |
612 | if (b->memory == V4L2_MEMORY_MMAP) | |
613 | up_read(¤t->mm->mmap_sem); | |
614 | ||
7a7d9a89 MCC |
615 | return retval; |
616 | } | |
7a02264c | 617 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
137d1cb1 BP |
618 | |
619 | /* Locking: Caller holds q->vb_lock */ | |
620 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) | |
7a7d9a89 | 621 | { |
7a7d9a89 MCC |
622 | int retval; |
623 | ||
137d1cb1 BP |
624 | checks: |
625 | if (!q->streaming) { | |
626 | dprintk(1, "next_buffer: Not streaming\n"); | |
627 | retval = -EINVAL; | |
7a7d9a89 MCC |
628 | goto done; |
629 | } | |
137d1cb1 | 630 | |
7a7d9a89 | 631 | if (list_empty(&q->stream)) { |
137d1cb1 BP |
632 | if (noblock) { |
633 | retval = -EAGAIN; | |
634 | dprintk(2, "next_buffer: no buffers to dequeue\n"); | |
635 | goto done; | |
636 | } else { | |
637 | dprintk(2, "next_buffer: waiting on buffer\n"); | |
638 | ||
639 | /* Drop lock to avoid deadlock with qbuf */ | |
97397687 | 640 | videobuf_queue_unlock(q); |
137d1cb1 BP |
641 | |
642 | /* Checking list_empty and streaming is safe without | |
643 | * locks because we goto checks to validate while | |
644 | * holding locks before proceeding */ | |
645 | retval = wait_event_interruptible(q->wait, | |
646 | !list_empty(&q->stream) || !q->streaming); | |
97397687 | 647 | videobuf_queue_lock(q); |
137d1cb1 BP |
648 | |
649 | if (retval) | |
650 | goto done; | |
651 | ||
652 | goto checks; | |
653 | } | |
7a7d9a89 | 654 | } |
137d1cb1 BP |
655 | |
656 | retval = 0; | |
657 | ||
658 | done: | |
659 | return retval; | |
660 | } | |
661 | ||
137d1cb1 BP |
662 | /* Locking: Caller holds q->vb_lock */ |
663 | static int stream_next_buffer(struct videobuf_queue *q, | |
664 | struct videobuf_buffer **vb, int nonblocking) | |
665 | { | |
666 | int retval; | |
667 | struct videobuf_buffer *buf = NULL; | |
668 | ||
669 | retval = stream_next_buffer_check_queue(q, nonblocking); | |
670 | if (retval) | |
671 | goto done; | |
672 | ||
7a7d9a89 MCC |
673 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
674 | retval = videobuf_waiton(buf, nonblocking, 1); | |
137d1cb1 BP |
675 | if (retval < 0) |
676 | goto done; | |
677 | ||
678 | *vb = buf; | |
679 | done: | |
680 | return retval; | |
681 | } | |
682 | ||
683 | int videobuf_dqbuf(struct videobuf_queue *q, | |
7a02264c | 684 | struct v4l2_buffer *b, int nonblocking) |
137d1cb1 BP |
685 | { |
686 | struct videobuf_buffer *buf = NULL; | |
687 | int retval; | |
688 | ||
689 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); | |
690 | ||
b2dfd1a4 | 691 | memset(b, 0, sizeof(*b)); |
97397687 | 692 | videobuf_queue_lock(q); |
137d1cb1 BP |
693 | |
694 | retval = stream_next_buffer(q, &buf, nonblocking); | |
7a7d9a89 | 695 | if (retval < 0) { |
137d1cb1 | 696 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
7a7d9a89 MCC |
697 | goto done; |
698 | } | |
137d1cb1 | 699 | |
7a7d9a89 | 700 | switch (buf->state) { |
0fc0686e | 701 | case VIDEOBUF_ERROR: |
e2c77314 | 702 | dprintk(1, "dqbuf: state is error\n"); |
7a7d9a89 | 703 | break; |
0fc0686e | 704 | case VIDEOBUF_DONE: |
e2c77314 | 705 | dprintk(1, "dqbuf: state is done\n"); |
7a7d9a89 MCC |
706 | break; |
707 | default: | |
e2c77314 | 708 | dprintk(1, "dqbuf: state invalid\n"); |
7a7d9a89 MCC |
709 | retval = -EINVAL; |
710 | goto done; | |
711 | } | |
b2dfd1a4 | 712 | CALL(q, sync, q, buf); |
e2c77314 | 713 | videobuf_status(q, b, buf, q->type); |
b2dfd1a4 HV |
714 | list_del(&buf->stream); |
715 | buf->state = VIDEOBUF_IDLE; | |
716 | b->flags &= ~V4L2_BUF_FLAG_DONE; | |
7a02264c | 717 | done: |
97397687 | 718 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
719 | return retval; |
720 | } | |
7a02264c | 721 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
7a7d9a89 MCC |
722 | |
723 | int videobuf_streamon(struct videobuf_queue *q) | |
724 | { | |
725 | struct videobuf_buffer *buf; | |
e2c77314 | 726 | unsigned long flags = 0; |
7a7d9a89 MCC |
727 | int retval; |
728 | ||
97397687 | 729 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
730 | retval = -EBUSY; |
731 | if (q->reading) | |
732 | goto done; | |
733 | retval = 0; | |
734 | if (q->streaming) | |
735 | goto done; | |
736 | q->streaming = 1; | |
0cf4daee | 737 | spin_lock_irqsave(q->irqlock, flags); |
a991f44b | 738 | list_for_each_entry(buf, &q->stream, stream) |
0fc0686e | 739 | if (buf->state == VIDEOBUF_PREPARED) |
e2c77314 | 740 | q->ops->buf_queue(q, buf); |
0cf4daee | 741 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 | 742 | |
137d1cb1 | 743 | wake_up_interruptible_sync(&q->wait); |
7a02264c | 744 | done: |
97397687 | 745 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
746 | return retval; |
747 | } | |
7a02264c | 748 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
7a7d9a89 | 749 | |
64f9477f | 750 | /* Locking: Caller holds q->vb_lock */ |
19bc5133 | 751 | static int __videobuf_streamoff(struct videobuf_queue *q) |
7a7d9a89 | 752 | { |
7a7d9a89 | 753 | if (!q->streaming) |
19bc5133 BP |
754 | return -EINVAL; |
755 | ||
7a7d9a89 | 756 | videobuf_queue_cancel(q); |
7a7d9a89 | 757 | |
19bc5133 BP |
758 | return 0; |
759 | } | |
760 | ||
761 | int videobuf_streamoff(struct videobuf_queue *q) | |
762 | { | |
763 | int retval; | |
764 | ||
97397687 | 765 | videobuf_queue_lock(q); |
19bc5133 | 766 | retval = __videobuf_streamoff(q); |
97397687 | 767 | videobuf_queue_unlock(q); |
19bc5133 | 768 | |
7a7d9a89 MCC |
769 | return retval; |
770 | } | |
7a02264c | 771 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
7a7d9a89 | 772 | |
64f9477f | 773 | /* Locking: Caller holds q->vb_lock */ |
7a7d9a89 MCC |
774 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
775 | char __user *data, | |
776 | size_t count, loff_t *ppos) | |
777 | { | |
778 | enum v4l2_field field; | |
e2c77314 | 779 | unsigned long flags = 0; |
7a7d9a89 MCC |
780 | int retval; |
781 | ||
e2c77314 | 782 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 MCC |
783 | |
784 | /* setup stuff */ | |
33c38283 | 785 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 MCC |
786 | if (NULL == q->read_buf) |
787 | return -ENOMEM; | |
788 | ||
789 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
790 | q->read_buf->baddr = (unsigned long)data; | |
791 | q->read_buf->bsize = count; | |
792 | ||
793 | field = videobuf_next_field(q); | |
e2c77314 | 794 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
795 | if (0 != retval) |
796 | goto done; | |
797 | ||
798 | /* start capture & wait */ | |
0cf4daee | 799 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 800 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 801 | spin_unlock_irqrestore(q->irqlock, flags); |
e2c77314 | 802 | retval = videobuf_waiton(q->read_buf, 0, 0); |
7a7d9a89 | 803 | if (0 == retval) { |
e2c77314 | 804 | CALL(q, sync, q, q->read_buf); |
0fc0686e | 805 | if (VIDEOBUF_ERROR == q->read_buf->state) |
7a7d9a89 MCC |
806 | retval = -EIO; |
807 | else | |
808 | retval = q->read_buf->size; | |
809 | } | |
810 | ||
7a02264c | 811 | done: |
7a7d9a89 | 812 | /* cleanup */ |
e2c77314 | 813 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
814 | kfree(q->read_buf); |
815 | q->read_buf = NULL; | |
816 | return retval; | |
817 | } | |
818 | ||
37111039 HV |
819 | static int __videobuf_copy_to_user(struct videobuf_queue *q, |
820 | struct videobuf_buffer *buf, | |
821 | char __user *data, size_t count, | |
822 | int nonblocking) | |
823 | { | |
824 | void *vaddr = CALL(q, vaddr, buf); | |
825 | ||
826 | /* copy to userspace */ | |
827 | if (count > buf->size - q->read_off) | |
828 | count = buf->size - q->read_off; | |
829 | ||
830 | if (copy_to_user(data, vaddr + q->read_off, count)) | |
831 | return -EFAULT; | |
832 | ||
833 | return count; | |
834 | } | |
835 | ||
836 | static int __videobuf_copy_stream(struct videobuf_queue *q, | |
837 | struct videobuf_buffer *buf, | |
838 | char __user *data, size_t count, size_t pos, | |
839 | int vbihack, int nonblocking) | |
840 | { | |
841 | unsigned int *fc = CALL(q, vaddr, buf); | |
842 | ||
843 | if (vbihack) { | |
844 | /* dirty, undocumented hack -- pass the frame counter | |
845 | * within the last four bytes of each vbi data block. | |
846 | * We need that one to maintain backward compatibility | |
847 | * to all vbi decoding software out there ... */ | |
848 | fc += (buf->size >> 2) - 1; | |
849 | *fc = buf->field_count >> 1; | |
850 | dprintk(1, "vbihack: %d\n", *fc); | |
851 | } | |
852 | ||
853 | /* copy stuff using the common method */ | |
854 | count = __videobuf_copy_to_user(q, buf, data, count, nonblocking); | |
855 | ||
856 | if ((count == -EFAULT) && (pos == 0)) | |
857 | return -EFAULT; | |
858 | ||
859 | return count; | |
860 | } | |
861 | ||
7a7d9a89 MCC |
862 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
863 | char __user *data, size_t count, loff_t *ppos, | |
864 | int nonblocking) | |
865 | { | |
866 | enum v4l2_field field; | |
e2c77314 | 867 | unsigned long flags = 0; |
7daa4a88 | 868 | unsigned size = 0, nbufs = 1; |
7a7d9a89 MCC |
869 | int retval; |
870 | ||
e2c77314 | 871 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 872 | |
97397687 | 873 | videobuf_queue_lock(q); |
7a7d9a89 | 874 | |
e2c77314 | 875 | q->ops->buf_setup(q, &nbufs, &size); |
7a7d9a89 MCC |
876 | |
877 | if (NULL == q->read_buf && | |
878 | count >= size && | |
879 | !nonblocking) { | |
e2c77314 | 880 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
7a7d9a89 MCC |
881 | if (retval >= 0 || retval == -EIO) |
882 | /* ok, all done */ | |
883 | goto done; | |
884 | /* fallback to kernel bounce buffer on failures */ | |
885 | } | |
886 | ||
887 | if (NULL == q->read_buf) { | |
888 | /* need to capture a new frame */ | |
889 | retval = -ENOMEM; | |
33c38283 | 890 | q->read_buf = videobuf_alloc_vb(q); |
7a7d9a89 | 891 | |
e2c77314 | 892 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
7a7d9a89 MCC |
893 | if (NULL == q->read_buf) |
894 | goto done; | |
895 | q->read_buf->memory = V4L2_MEMORY_USERPTR; | |
896 | q->read_buf->bsize = count; /* preferred size */ | |
897 | field = videobuf_next_field(q); | |
e2c77314 | 898 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
7a7d9a89 MCC |
899 | |
900 | if (0 != retval) { | |
e2c77314 | 901 | kfree(q->read_buf); |
7a7d9a89 MCC |
902 | q->read_buf = NULL; |
903 | goto done; | |
904 | } | |
7a7d9a89 | 905 | |
0cf4daee | 906 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 907 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee BP |
908 | spin_unlock_irqrestore(q->irqlock, flags); |
909 | ||
7a7d9a89 MCC |
910 | q->read_off = 0; |
911 | } | |
912 | ||
913 | /* wait until capture is done */ | |
914 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); | |
915 | if (0 != retval) | |
916 | goto done; | |
917 | ||
e2c77314 | 918 | CALL(q, sync, q, q->read_buf); |
7a7d9a89 | 919 | |
0fc0686e | 920 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
7a7d9a89 | 921 | /* catch I/O errors */ |
e2c77314 | 922 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
923 | kfree(q->read_buf); |
924 | q->read_buf = NULL; | |
925 | retval = -EIO; | |
926 | goto done; | |
927 | } | |
928 | ||
929 | /* Copy to userspace */ | |
37111039 | 930 | retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking); |
e2c77314 | 931 | if (retval < 0) |
7a7d9a89 MCC |
932 | goto done; |
933 | ||
934 | q->read_off += retval; | |
935 | if (q->read_off == q->read_buf->size) { | |
936 | /* all data copied, cleanup */ | |
e2c77314 | 937 | q->ops->buf_release(q, q->read_buf); |
7a7d9a89 MCC |
938 | kfree(q->read_buf); |
939 | q->read_buf = NULL; | |
940 | } | |
941 | ||
7a02264c | 942 | done: |
97397687 | 943 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
944 | return retval; |
945 | } | |
7a02264c | 946 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
7a7d9a89 | 947 | |
64f9477f | 948 | /* Locking: Caller holds q->vb_lock */ |
225ba900 | 949 | static int __videobuf_read_start(struct videobuf_queue *q) |
7a7d9a89 MCC |
950 | { |
951 | enum v4l2_field field; | |
e2c77314 | 952 | unsigned long flags = 0; |
49ee718e | 953 | unsigned int count = 0, size = 0; |
7a7d9a89 MCC |
954 | int err, i; |
955 | ||
e2c77314 | 956 | q->ops->buf_setup(q, &count, &size); |
7a7d9a89 MCC |
957 | if (count < 2) |
958 | count = 2; | |
959 | if (count > VIDEO_MAX_FRAME) | |
960 | count = VIDEO_MAX_FRAME; | |
961 | size = PAGE_ALIGN(size); | |
962 | ||
19bc5133 | 963 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
49ee718e | 964 | if (err < 0) |
7a7d9a89 MCC |
965 | return err; |
966 | ||
49ee718e BP |
967 | count = err; |
968 | ||
7a7d9a89 MCC |
969 | for (i = 0; i < count; i++) { |
970 | field = videobuf_next_field(q); | |
e2c77314 | 971 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
7a7d9a89 MCC |
972 | if (err) |
973 | return err; | |
974 | list_add_tail(&q->bufs[i]->stream, &q->stream); | |
975 | } | |
0cf4daee | 976 | spin_lock_irqsave(q->irqlock, flags); |
7a7d9a89 | 977 | for (i = 0; i < count; i++) |
e2c77314 | 978 | q->ops->buf_queue(q, q->bufs[i]); |
0cf4daee | 979 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
980 | q->reading = 1; |
981 | return 0; | |
982 | } | |
983 | ||
19bc5133 | 984 | static void __videobuf_read_stop(struct videobuf_queue *q) |
7a7d9a89 MCC |
985 | { |
986 | int i; | |
987 | ||
988 | videobuf_queue_cancel(q); | |
a438d6da | 989 | __videobuf_free(q); |
7a7d9a89 MCC |
990 | INIT_LIST_HEAD(&q->stream); |
991 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { | |
992 | if (NULL == q->bufs[i]) | |
993 | continue; | |
994 | kfree(q->bufs[i]); | |
995 | q->bufs[i] = NULL; | |
996 | } | |
997 | q->read_buf = NULL; | |
19bc5133 BP |
998 | } |
999 | ||
19fb1457 MCC |
1000 | int videobuf_read_start(struct videobuf_queue *q) |
1001 | { | |
1002 | int rc; | |
1003 | ||
97397687 | 1004 | videobuf_queue_lock(q); |
19fb1457 | 1005 | rc = __videobuf_read_start(q); |
97397687 | 1006 | videobuf_queue_unlock(q); |
19fb1457 MCC |
1007 | |
1008 | return rc; | |
1009 | } | |
7a02264c | 1010 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
19fb1457 | 1011 | |
19bc5133 BP |
1012 | void videobuf_read_stop(struct videobuf_queue *q) |
1013 | { | |
97397687 | 1014 | videobuf_queue_lock(q); |
19bc5133 | 1015 | __videobuf_read_stop(q); |
97397687 | 1016 | videobuf_queue_unlock(q); |
19bc5133 | 1017 | } |
7a02264c | 1018 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
19bc5133 BP |
1019 | |
1020 | void videobuf_stop(struct videobuf_queue *q) | |
1021 | { | |
97397687 | 1022 | videobuf_queue_lock(q); |
19bc5133 BP |
1023 | |
1024 | if (q->streaming) | |
1025 | __videobuf_streamoff(q); | |
1026 | ||
1027 | if (q->reading) | |
1028 | __videobuf_read_stop(q); | |
1029 | ||
97397687 | 1030 | videobuf_queue_unlock(q); |
7a7d9a89 | 1031 | } |
7a02264c | 1032 | EXPORT_SYMBOL_GPL(videobuf_stop); |
19bc5133 | 1033 | |
7a7d9a89 MCC |
1034 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
1035 | char __user *data, size_t count, loff_t *ppos, | |
1036 | int vbihack, int nonblocking) | |
1037 | { | |
1038 | int rc, retval; | |
e2c77314 | 1039 | unsigned long flags = 0; |
7a7d9a89 | 1040 | |
e2c77314 | 1041 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1042 | |
7e28adb2 | 1043 | dprintk(2, "%s\n", __func__); |
97397687 | 1044 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1045 | retval = -EBUSY; |
1046 | if (q->streaming) | |
1047 | goto done; | |
1048 | if (!q->reading) { | |
3f84307a | 1049 | retval = __videobuf_read_start(q); |
7a7d9a89 MCC |
1050 | if (retval < 0) |
1051 | goto done; | |
1052 | } | |
1053 | ||
1054 | retval = 0; | |
1055 | while (count > 0) { | |
1056 | /* get / wait for data */ | |
1057 | if (NULL == q->read_buf) { | |
1058 | q->read_buf = list_entry(q->stream.next, | |
1059 | struct videobuf_buffer, | |
1060 | stream); | |
1061 | list_del(&q->read_buf->stream); | |
1062 | q->read_off = 0; | |
1063 | } | |
1064 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); | |
1065 | if (rc < 0) { | |
1066 | if (0 == retval) | |
1067 | retval = rc; | |
1068 | break; | |
1069 | } | |
1070 | ||
0fc0686e | 1071 | if (q->read_buf->state == VIDEOBUF_DONE) { |
37111039 | 1072 | rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count, |
7a7d9a89 MCC |
1073 | retval, vbihack, nonblocking); |
1074 | if (rc < 0) { | |
1075 | retval = rc; | |
1076 | break; | |
1077 | } | |
1078 | retval += rc; | |
1079 | count -= rc; | |
1080 | q->read_off += rc; | |
1081 | } else { | |
1082 | /* some error */ | |
1083 | q->read_off = q->read_buf->size; | |
1084 | if (0 == retval) | |
1085 | retval = -EIO; | |
1086 | } | |
1087 | ||
1088 | /* requeue buffer when done with copying */ | |
1089 | if (q->read_off == q->read_buf->size) { | |
1090 | list_add_tail(&q->read_buf->stream, | |
1091 | &q->stream); | |
0cf4daee | 1092 | spin_lock_irqsave(q->irqlock, flags); |
e2c77314 | 1093 | q->ops->buf_queue(q, q->read_buf); |
0cf4daee | 1094 | spin_unlock_irqrestore(q->irqlock, flags); |
7a7d9a89 MCC |
1095 | q->read_buf = NULL; |
1096 | } | |
1097 | if (retval < 0) | |
1098 | break; | |
1099 | } | |
1100 | ||
7a02264c | 1101 | done: |
97397687 | 1102 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1103 | return retval; |
1104 | } | |
7a02264c | 1105 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
7a7d9a89 MCC |
1106 | |
1107 | unsigned int videobuf_poll_stream(struct file *file, | |
1108 | struct videobuf_queue *q, | |
1109 | poll_table *wait) | |
1110 | { | |
1111 | struct videobuf_buffer *buf = NULL; | |
1112 | unsigned int rc = 0; | |
1113 | ||
97397687 | 1114 | videobuf_queue_lock(q); |
7a7d9a89 MCC |
1115 | if (q->streaming) { |
1116 | if (!list_empty(&q->stream)) | |
1117 | buf = list_entry(q->stream.next, | |
1118 | struct videobuf_buffer, stream); | |
1119 | } else { | |
1120 | if (!q->reading) | |
3f84307a | 1121 | __videobuf_read_start(q); |
7a7d9a89 MCC |
1122 | if (!q->reading) { |
1123 | rc = POLLERR; | |
1124 | } else if (NULL == q->read_buf) { | |
1125 | q->read_buf = list_entry(q->stream.next, | |
1126 | struct videobuf_buffer, | |
1127 | stream); | |
1128 | list_del(&q->read_buf->stream); | |
1129 | q->read_off = 0; | |
1130 | } | |
1131 | buf = q->read_buf; | |
1132 | } | |
1133 | if (!buf) | |
1134 | rc = POLLERR; | |
1135 | ||
1136 | if (0 == rc) { | |
1137 | poll_wait(file, &buf->done, wait); | |
0fc0686e | 1138 | if (buf->state == VIDEOBUF_DONE || |
9b558434 PO |
1139 | buf->state == VIDEOBUF_ERROR) { |
1140 | switch (q->type) { | |
1141 | case V4L2_BUF_TYPE_VIDEO_OUTPUT: | |
1142 | case V4L2_BUF_TYPE_VBI_OUTPUT: | |
1143 | case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: | |
1144 | rc = POLLOUT | POLLWRNORM; | |
1145 | break; | |
1146 | default: | |
1147 | rc = POLLIN | POLLRDNORM; | |
1148 | break; | |
1149 | } | |
1150 | } | |
7a7d9a89 | 1151 | } |
97397687 | 1152 | videobuf_queue_unlock(q); |
7a7d9a89 MCC |
1153 | return rc; |
1154 | } | |
7a02264c | 1155 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
7a7d9a89 | 1156 | |
7a02264c | 1157 | int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma) |
7a7d9a89 | 1158 | { |
0b62b737 HV |
1159 | int rc = -EINVAL; |
1160 | int i; | |
7a7d9a89 | 1161 | |
e2c77314 | 1162 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1163 | |
0b62b737 HV |
1164 | if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) { |
1165 | dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n"); | |
1166 | return -EINVAL; | |
1167 | } | |
1168 | ||
97397687 | 1169 | videobuf_queue_lock(q); |
0b62b737 HV |
1170 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
1171 | struct videobuf_buffer *buf = q->bufs[i]; | |
1172 | ||
1173 | if (buf && buf->memory == V4L2_MEMORY_MMAP && | |
1174 | buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) { | |
1175 | rc = CALL(q, mmap_mapper, q, buf, vma); | |
1176 | break; | |
1177 | } | |
1178 | } | |
97397687 | 1179 | videobuf_queue_unlock(q); |
7a7d9a89 | 1180 | |
0b62b737 | 1181 | return rc; |
7a7d9a89 | 1182 | } |
7a02264c | 1183 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |
7a7d9a89 MCC |
1184 | |
1185 | #ifdef CONFIG_VIDEO_V4L1_COMPAT | |
1186 | int videobuf_cgmbuf(struct videobuf_queue *q, | |
1187 | struct video_mbuf *mbuf, int count) | |
1188 | { | |
1189 | struct v4l2_requestbuffers req; | |
e2c77314 | 1190 | int rc, i; |
7a7d9a89 | 1191 | |
e2c77314 | 1192 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
7a7d9a89 | 1193 | |
e2c77314 | 1194 | memset(&req, 0, sizeof(req)); |
7a7d9a89 MCC |
1195 | req.type = q->type; |
1196 | req.count = count; | |
1197 | req.memory = V4L2_MEMORY_MMAP; | |
e2c77314 | 1198 | rc = videobuf_reqbufs(q, &req); |
7a7d9a89 MCC |
1199 | if (rc < 0) |
1200 | return rc; | |
1201 | ||
1202 | mbuf->frames = req.count; | |
1203 | mbuf->size = 0; | |
1204 | for (i = 0; i < mbuf->frames; i++) { | |
1205 | mbuf->offsets[i] = q->bufs[i]->boff; | |
7cbefad0 | 1206 | mbuf->size += PAGE_ALIGN(q->bufs[i]->bsize); |
7a7d9a89 MCC |
1207 | } |
1208 | ||
1209 | return 0; | |
1210 | } | |
a13625c5 | 1211 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
7a7d9a89 MCC |
1212 | #endif |
1213 |