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