blob: de4fa4eb8844b3b77f82ae8344633e1201e38ad3 [file] [log] [blame]
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001/*
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>
Andrea Righi27ac7922008-07-23 21:28:13 -070019#include <linux/mm.h>
Alexey Dobriyand43c36d2009-10-07 17:09:06 +040020#include <linux/sched.h>
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030021#include <linux/slab.h>
22#include <linux/interrupt.h>
23
24#include <media/videobuf-core.h>
25
26#define MAGIC_BUFFER 0x20070728
Pawel Osciak7a022642010-03-17 04:01:04 -030027#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)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030036
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -030037static int debug;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030038module_param(debug, int, 0644);
39
40MODULE_DESCRIPTION("helper module to manage video4linux buffers");
41MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
42MODULE_LICENSE("GPL");
43
Pawel Osciak7a022642010-03-17 04:01:04 -030044#define dprintk(level, fmt, arg...) \
45 do { \
46 if (debug >= level) \
47 printk(KERN_DEBUG "vbuf: " fmt, ## arg); \
48 } while (0)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030049
50/* --------------------------------------------------------------------- */
51
52#define CALL(q, f, arg...) \
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -030053 ((q->int_ops->f) ? q->int_ops->f(arg) : 0)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030054
Pawel Osciak33c38282010-05-11 10:36:28 -030055struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030056{
57 struct videobuf_buffer *vb;
58
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -030059 BUG_ON(q->msize < sizeof(*vb));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030060
Pawel Osciak33c38282010-05-11 10:36:28 -030061 if (!q->int_ops || !q->int_ops->alloc_vb) {
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030062 printk(KERN_ERR "No specific ops defined!\n");
63 BUG();
64 }
65
Pawel Osciak33c38282010-05-11 10:36:28 -030066 vb = q->int_ops->alloc_vb(q->msize);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030067 if (NULL != vb) {
68 init_waitqueue_head(&vb->done);
Pawel Osciak7a022642010-03-17 04:01:04 -030069 vb->magic = MAGIC_BUFFER;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030070 }
71
72 return vb;
73}
Pawel Osciak33c38282010-05-11 10:36:28 -030074EXPORT_SYMBOL_GPL(videobuf_alloc_vb);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030075
Hans Verkuil0e0809a2010-09-26 09:01:26 -030076static int is_state_active_or_queued(struct videobuf_queue *q, struct videobuf_buffer *vb)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030077{
Hans Verkuil0e0809a2010-09-26 09:01:26 -030078 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
87int 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
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -030093 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
Brandon Philips009a9052008-04-02 18:10:59 -030094
95 if (non_blocking) {
Hans Verkuil0e0809a2010-09-26 09:01:26 -030096 if (is_state_active_or_queued(q, vb))
Brandon Philips009a9052008-04-02 18:10:59 -030097 return 0;
Hans Verkuil0e0809a2010-09-26 09:01:26 -030098 return -EAGAIN;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -030099 }
Brandon Philips009a9052008-04-02 18:10:59 -0300100
Hans Verkuil0e0809a2010-09-26 09:01:26 -0300101 is_ext_locked = q->ext_lock && mutex_is_locked(q->ext_lock);
Brandon Philips009a9052008-04-02 18:10:59 -0300102
Hans Verkuil0e0809a2010-09-26 09:01:26 -0300103 /* 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);
107 if (intr)
108 ret = wait_event_interruptible(vb->done, is_state_active_or_queued(q, vb));
109 else
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);
114
115 return ret;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300116}
Pawel Osciak7a022642010-03-17 04:01:04 -0300117EXPORT_SYMBOL_GPL(videobuf_waiton);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300118
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300119int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300120 struct v4l2_framebuffer *fbuf)
121{
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300122 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
123 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300124
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300125 return CALL(q, iolock, q, vb, fbuf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300126}
Pawel Osciak7a022642010-03-17 04:01:04 -0300127EXPORT_SYMBOL_GPL(videobuf_iolock);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300128
Hans Verkuilf4fce602010-03-28 08:33:23 -0300129void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
130 struct videobuf_buffer *buf)
Mauro Carvalho Chehab59d34482008-04-13 15:10:00 -0300131{
Hans Verkuil037c75e2010-03-28 08:18:37 -0300132 if (q->int_ops->vaddr)
133 return q->int_ops->vaddr(buf);
Hans Verkuilf4fce602010-03-28 08:33:23 -0300134 return NULL;
Mauro Carvalho Chehab59d34482008-04-13 15:10:00 -0300135}
Hans Verkuilf4fce602010-03-28 08:33:23 -0300136EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr);
Mauro Carvalho Chehab59d34482008-04-13 15:10:00 -0300137
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300138/* --------------------------------------------------------------------- */
139
140
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300141void videobuf_queue_core_init(struct videobuf_queue *q,
Jonathan Corbet38a54f32009-11-17 19:43:41 -0300142 const struct videobuf_queue_ops *ops,
Guennadi Liakhovetskie9bcf662008-04-22 14:46:02 -0300143 struct device *dev,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300144 spinlock_t *irqlock,
145 enum v4l2_buf_type type,
146 enum v4l2_field field,
147 unsigned int msize,
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300148 void *priv,
Hans Verkuil08bff032010-09-20 17:39:46 -0300149 struct videobuf_qtype_ops *int_ops,
150 struct mutex *ext_lock)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300151{
Figo.zhang96ceea22009-06-02 23:01:04 -0300152 BUG_ON(!q);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300153 memset(q, 0, sizeof(*q));
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300154 q->irqlock = irqlock;
Hans Verkuil08bff032010-09-20 17:39:46 -0300155 q->ext_lock = ext_lock;
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300156 q->dev = dev;
157 q->type = type;
158 q->field = field;
159 q->msize = msize;
160 q->ops = ops;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300161 q->priv_data = priv;
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300162 q->int_ops = int_ops;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300163
164 /* All buffer operations are mandatory */
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300165 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);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300169
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700170 /* Lock is mandatory for queue_cancel to work */
171 BUG_ON(!irqlock);
172
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300173 /* Having implementations for abstract methods are mandatory */
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300174 BUG_ON(!q->int_ops);
Mauro Carvalho Chehabd4cae5a2007-10-08 12:20:02 -0300175
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300176 mutex_init(&q->vb_lock);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300177 init_waitqueue_head(&q->wait);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300178 INIT_LIST_HEAD(&q->stream);
179}
Pawel Osciak7a022642010-03-17 04:01:04 -0300180EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300181
Brandon Philips19bc5132007-11-13 20:05:38 -0300182/* Locking: Only usage in bttv unsafe find way to remove */
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300183int videobuf_queue_is_busy(struct videobuf_queue *q)
184{
185 int i;
186
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300187 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300188
189 if (q->streaming) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300190 dprintk(1, "busy: streaming active\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300191 return 1;
192 }
193 if (q->reading) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300194 dprintk(1, "busy: pending read #1\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300195 return 1;
196 }
197 if (q->read_buf) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300198 dprintk(1, "busy: pending read #2\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300199 return 1;
200 }
201 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
202 if (NULL == q->bufs[i])
203 continue;
Mauro Carvalho Chehab851c0c92007-09-27 18:25:44 -0300204 if (q->bufs[i]->map) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300205 dprintk(1, "busy: buffer #%d mapped\n", i);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300206 return 1;
207 }
Brandon Philips0fc06862007-11-06 20:02:36 -0300208 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300209 dprintk(1, "busy: buffer #%d queued\n", i);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300210 return 1;
211 }
Brandon Philips0fc06862007-11-06 20:02:36 -0300212 if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300213 dprintk(1, "busy: buffer #%d avtive\n", i);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300214 return 1;
215 }
216 }
217 return 0;
218}
Pawel Osciak7a022642010-03-17 04:01:04 -0300219EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300220
Pawel Osciaka438d6d2010-05-11 10:36:29 -0300221/**
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 */
228static 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
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300260/* Locking: Caller holds q->vb_lock */
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300261void videobuf_queue_cancel(struct videobuf_queue *q)
262{
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300263 unsigned long flags = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300264 int i;
265
Brandon Philips137d1cb2008-04-02 18:10:59 -0300266 q->streaming = 0;
267 q->reading = 0;
268 wake_up_interruptible_sync(&q->wait);
269
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300270 /* remove queued buffers from list */
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700271 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300272 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
273 if (NULL == q->bufs[i])
274 continue;
Brandon Philips0fc06862007-11-06 20:02:36 -0300275 if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300276 list_del(&q->bufs[i]->queue);
Brandon Philips0fc06862007-11-06 20:02:36 -0300277 q->bufs[i]->state = VIDEOBUF_ERROR;
Brandon Philipsb608f432008-04-02 18:10:57 -0300278 wake_up_all(&q->bufs[i]->done);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300279 }
280 }
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700281 spin_unlock_irqrestore(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300282
283 /* free all buffers + clear queue */
284 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
285 if (NULL == q->bufs[i])
286 continue;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300287 q->ops->buf_release(q, q->bufs[i]);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300288 }
289 INIT_LIST_HEAD(&q->stream);
290}
Pawel Osciak7a022642010-03-17 04:01:04 -0300291EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300292
293/* --------------------------------------------------------------------- */
294
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300295/* Locking: Caller holds q->vb_lock */
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300296enum 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}
Pawel Osciak7a022642010-03-17 04:01:04 -0300313EXPORT_SYMBOL_GPL(videobuf_next_field);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300314
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300315/* Locking: Caller holds q->vb_lock */
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300316static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
317 struct videobuf_buffer *vb, enum v4l2_buf_type type)
318{
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300319 MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
320 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300321
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;
338 }
339
340 b->flags = 0;
Mauro Carvalho Chehab851c0c92007-09-27 18:25:44 -0300341 if (vb->map)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300342 b->flags |= V4L2_BUF_FLAG_MAPPED;
343
344 switch (vb->state) {
Brandon Philips0fc06862007-11-06 20:02:36 -0300345 case VIDEOBUF_PREPARED:
346 case VIDEOBUF_QUEUED:
347 case VIDEOBUF_ACTIVE:
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300348 b->flags |= V4L2_BUF_FLAG_QUEUED;
349 break;
Brandon Philips0fc06862007-11-06 20:02:36 -0300350 case VIDEOBUF_ERROR:
Hans Verkuilb2dfd1a2010-04-28 04:05:22 -0300351 b->flags |= V4L2_BUF_FLAG_ERROR;
352 /* fall through */
353 case VIDEOBUF_DONE:
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300354 b->flags |= V4L2_BUF_FLAG_DONE;
355 break;
Brandon Philips0fc06862007-11-06 20:02:36 -0300356 case VIDEOBUF_NEEDS_INIT:
357 case VIDEOBUF_IDLE:
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300358 /* nothing */
359 break;
360 }
361
362 if (vb->input != UNSET) {
363 b->flags |= V4L2_BUF_FLAG_INPUT;
364 b->input = vb->input;
365 }
366
367 b->field = vb->field;
368 b->timestamp = vb->ts;
369 b->bytesused = vb->size;
370 b->sequence = vb->field_count >> 1;
371}
372
Brandon Philips19bc5132007-11-13 20:05:38 -0300373int videobuf_mmap_free(struct videobuf_queue *q)
374{
375 int ret;
Hans Verkuil97397682010-09-20 17:24:30 -0300376 videobuf_queue_lock(q);
Pawel Osciaka438d6d2010-05-11 10:36:29 -0300377 ret = __videobuf_free(q);
Hans Verkuil97397682010-09-20 17:24:30 -0300378 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300379 return ret;
380}
Pawel Osciak7a022642010-03-17 04:01:04 -0300381EXPORT_SYMBOL_GPL(videobuf_mmap_free);
Brandon Philips19bc5132007-11-13 20:05:38 -0300382
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300383/* Locking: Caller holds q->vb_lock */
Arjan van de Ven81b2dbc2008-05-20 09:53:52 -0700384int __videobuf_mmap_setup(struct videobuf_queue *q,
Brandon Philips19bc5132007-11-13 20:05:38 -0300385 unsigned int bcount, unsigned int bsize,
386 enum v4l2_memory memory)
387{
388 unsigned int i;
389 int err;
390
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300391 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Brandon Philips19bc5132007-11-13 20:05:38 -0300392
Pawel Osciaka438d6d2010-05-11 10:36:29 -0300393 err = __videobuf_free(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300394 if (0 != err)
395 return err;
396
397 /* Allocate and initialize buffers */
398 for (i = 0; i < bcount; i++) {
Pawel Osciak33c38282010-05-11 10:36:28 -0300399 q->bufs[i] = videobuf_alloc_vb(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300400
Pawel Osciak7a022642010-03-17 04:01:04 -0300401 if (NULL == q->bufs[i])
Brandon Philips19bc5132007-11-13 20:05:38 -0300402 break;
403
404 q->bufs[i]->i = i;
405 q->bufs[i]->input = UNSET;
406 q->bufs[i]->memory = memory;
407 q->bufs[i]->bsize = bsize;
408 switch (memory) {
409 case V4L2_MEMORY_MMAP:
Tuukka Toivonen7cbefad2009-07-23 10:56:25 -0300410 q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
Brandon Philips19bc5132007-11-13 20:05:38 -0300411 break;
412 case V4L2_MEMORY_USERPTR:
413 case V4L2_MEMORY_OVERLAY:
414 /* nothing */
415 break;
416 }
417 }
418
419 if (!i)
420 return -ENOMEM;
421
Pawel Osciak7a022642010-03-17 04:01:04 -0300422 dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize);
Brandon Philips19bc5132007-11-13 20:05:38 -0300423
424 return i;
425}
Pawel Osciak7a022642010-03-17 04:01:04 -0300426EXPORT_SYMBOL_GPL(__videobuf_mmap_setup);
Brandon Philips19bc5132007-11-13 20:05:38 -0300427
428int videobuf_mmap_setup(struct videobuf_queue *q,
429 unsigned int bcount, unsigned int bsize,
430 enum v4l2_memory memory)
431{
432 int ret;
Hans Verkuil97397682010-09-20 17:24:30 -0300433 videobuf_queue_lock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300434 ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
Hans Verkuil97397682010-09-20 17:24:30 -0300435 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300436 return ret;
437}
Pawel Osciak7a022642010-03-17 04:01:04 -0300438EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
Brandon Philips19bc5132007-11-13 20:05:38 -0300439
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300440int videobuf_reqbufs(struct videobuf_queue *q,
441 struct v4l2_requestbuffers *req)
442{
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300443 unsigned int size, count;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300444 int retval;
445
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300446 if (req->count < 1) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300447 dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300448 return -EINVAL;
449 }
Brandon Philips19bc5132007-11-13 20:05:38 -0300450
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300451 if (req->memory != V4L2_MEMORY_MMAP &&
452 req->memory != V4L2_MEMORY_USERPTR &&
453 req->memory != V4L2_MEMORY_OVERLAY) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300454 dprintk(1, "reqbufs: memory type invalid\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300455 return -EINVAL;
456 }
457
Hans Verkuil97397682010-09-20 17:24:30 -0300458 videobuf_queue_lock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300459 if (req->type != q->type) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300460 dprintk(1, "reqbufs: queue type invalid\n");
Brandon Philips19bc5132007-11-13 20:05:38 -0300461 retval = -EINVAL;
462 goto done;
463 }
464
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300465 if (q->streaming) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300466 dprintk(1, "reqbufs: streaming already exists\n");
Brandon Philips00f98d02007-09-27 20:55:28 -0300467 retval = -EBUSY;
468 goto done;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300469 }
470 if (!list_empty(&q->stream)) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300471 dprintk(1, "reqbufs: stream running\n");
Brandon Philips00f98d02007-09-27 20:55:28 -0300472 retval = -EBUSY;
473 goto done;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300474 }
475
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300476 count = req->count;
477 if (count > VIDEO_MAX_FRAME)
478 count = VIDEO_MAX_FRAME;
479 size = 0;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300480 q->ops->buf_setup(q, &count, &size);
Márton Németh296372e2009-11-22 18:03:05 -0300481 dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n",
482 count, size,
Pawel Osciak7a022642010-03-17 04:01:04 -0300483 (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT));
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300484
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300485 retval = __videobuf_mmap_setup(q, count, size, req->memory);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300486 if (retval < 0) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300487 dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300488 goto done;
489 }
490
Brandon Philips49ee7182007-10-05 16:26:27 -0300491 req->count = retval;
Németh Márton925d74a2009-04-29 15:57:24 -0300492 retval = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300493
494 done:
Hans Verkuil97397682010-09-20 17:24:30 -0300495 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300496 return retval;
497}
Pawel Osciak7a022642010-03-17 04:01:04 -0300498EXPORT_SYMBOL_GPL(videobuf_reqbufs);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300499
500int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
501{
Brandon Philips19bc5132007-11-13 20:05:38 -0300502 int ret = -EINVAL;
503
Hans Verkuil97397682010-09-20 17:24:30 -0300504 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300505 if (unlikely(b->type != q->type)) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300506 dprintk(1, "querybuf: Wrong type.\n");
Brandon Philips19bc5132007-11-13 20:05:38 -0300507 goto done;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300508 }
Roel Kluin223ffe52009-05-02 16:38:47 -0300509 if (unlikely(b->index >= VIDEO_MAX_FRAME)) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300510 dprintk(1, "querybuf: index out of range.\n");
Brandon Philips19bc5132007-11-13 20:05:38 -0300511 goto done;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300512 }
513 if (unlikely(NULL == q->bufs[b->index])) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300514 dprintk(1, "querybuf: buffer is null.\n");
Brandon Philips19bc5132007-11-13 20:05:38 -0300515 goto done;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300516 }
Brandon Philips19bc5132007-11-13 20:05:38 -0300517
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300518 videobuf_status(q, b, q->bufs[b->index], q->type);
Brandon Philips19bc5132007-11-13 20:05:38 -0300519
520 ret = 0;
521done:
Hans Verkuil97397682010-09-20 17:24:30 -0300522 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300523 return ret;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300524}
Pawel Osciak7a022642010-03-17 04:01:04 -0300525EXPORT_SYMBOL_GPL(videobuf_querybuf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300526
Pawel Osciak7a022642010-03-17 04:01:04 -0300527int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300528{
529 struct videobuf_buffer *buf;
530 enum v4l2_field field;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300531 unsigned long flags = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300532 int retval;
533
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300534 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300535
Maxim Levitsky99001322007-09-27 20:34:09 -0300536 if (b->memory == V4L2_MEMORY_MMAP)
537 down_read(&current->mm->mmap_sem);
538
Hans Verkuil97397682010-09-20 17:24:30 -0300539 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300540 retval = -EBUSY;
541 if (q->reading) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300542 dprintk(1, "qbuf: Reading running...\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300543 goto done;
544 }
545 retval = -EINVAL;
546 if (b->type != q->type) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300547 dprintk(1, "qbuf: Wrong type.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300548 goto done;
549 }
Roel Kluin223ffe52009-05-02 16:38:47 -0300550 if (b->index >= VIDEO_MAX_FRAME) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300551 dprintk(1, "qbuf: index out of range.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300552 goto done;
553 }
554 buf = q->bufs[b->index];
555 if (NULL == buf) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300556 dprintk(1, "qbuf: buffer is null.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300557 goto done;
558 }
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300559 MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300560 if (buf->memory != b->memory) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300561 dprintk(1, "qbuf: memory type is wrong.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300562 goto done;
563 }
Brandon Philips0fc06862007-11-06 20:02:36 -0300564 if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300565 dprintk(1, "qbuf: buffer is already queued or active.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300566 goto done;
567 }
568
569 if (b->flags & V4L2_BUF_FLAG_INPUT) {
570 if (b->input >= q->inputs) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300571 dprintk(1, "qbuf: wrong input.\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300572 goto done;
573 }
574 buf->input = b->input;
575 } else {
576 buf->input = UNSET;
577 }
578
579 switch (b->memory) {
580 case V4L2_MEMORY_MMAP:
581 if (0 == buf->baddr) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300582 dprintk(1, "qbuf: mmap requested "
583 "but buffer addr is zero!\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300584 goto done;
585 }
Pawel Osciak96f2ec62010-04-21 06:44:27 -0300586 if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT
587 || q->type == V4L2_BUF_TYPE_VBI_OUTPUT
588 || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
589 buf->size = b->bytesused;
590 buf->field = b->field;
591 buf->ts = b->timestamp;
592 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300593 break;
594 case V4L2_MEMORY_USERPTR:
595 if (b->length < buf->bsize) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300596 dprintk(1, "qbuf: buffer length is not enough\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300597 goto done;
598 }
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300599 if (VIDEOBUF_NEEDS_INIT != buf->state &&
600 buf->baddr != b->m.userptr)
601 q->ops->buf_release(q, buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300602 buf->baddr = b->m.userptr;
603 break;
604 case V4L2_MEMORY_OVERLAY:
605 buf->boff = b->m.offset;
606 break;
607 default:
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300608 dprintk(1, "qbuf: wrong memory type\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300609 goto done;
610 }
611
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300612 dprintk(1, "qbuf: requesting next field\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300613 field = videobuf_next_field(q);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300614 retval = q->ops->buf_prepare(q, buf, field);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300615 if (0 != retval) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300616 dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300617 goto done;
618 }
619
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300620 list_add_tail(&buf->stream, &q->stream);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300621 if (q->streaming) {
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700622 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300623 q->ops->buf_queue(q, buf);
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700624 spin_unlock_irqrestore(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300625 }
Hans Verkuil771075b2010-03-13 11:47:06 -0300626 dprintk(1, "qbuf: succeeded\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300627 retval = 0;
Brandon Philips137d1cb2008-04-02 18:10:59 -0300628 wake_up_interruptible_sync(&q->wait);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300629
Pawel Osciak7a022642010-03-17 04:01:04 -0300630done:
Hans Verkuil97397682010-09-20 17:24:30 -0300631 videobuf_queue_unlock(q);
Maxim Levitsky99001322007-09-27 20:34:09 -0300632
633 if (b->memory == V4L2_MEMORY_MMAP)
634 up_read(&current->mm->mmap_sem);
635
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300636 return retval;
637}
Pawel Osciak7a022642010-03-17 04:01:04 -0300638EXPORT_SYMBOL_GPL(videobuf_qbuf);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300639
640/* Locking: Caller holds q->vb_lock */
641static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock)
642{
643 int retval;
644
645checks:
646 if (!q->streaming) {
647 dprintk(1, "next_buffer: Not streaming\n");
648 retval = -EINVAL;
649 goto done;
650 }
651
652 if (list_empty(&q->stream)) {
653 if (noblock) {
654 retval = -EAGAIN;
655 dprintk(2, "next_buffer: no buffers to dequeue\n");
656 goto done;
657 } else {
658 dprintk(2, "next_buffer: waiting on buffer\n");
659
660 /* Drop lock to avoid deadlock with qbuf */
Hans Verkuil97397682010-09-20 17:24:30 -0300661 videobuf_queue_unlock(q);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300662
663 /* Checking list_empty and streaming is safe without
664 * locks because we goto checks to validate while
665 * holding locks before proceeding */
666 retval = wait_event_interruptible(q->wait,
667 !list_empty(&q->stream) || !q->streaming);
Hans Verkuil97397682010-09-20 17:24:30 -0300668 videobuf_queue_lock(q);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300669
670 if (retval)
671 goto done;
672
673 goto checks;
674 }
675 }
676
677 retval = 0;
678
679done:
680 return retval;
681}
682
Brandon Philips137d1cb2008-04-02 18:10:59 -0300683/* Locking: Caller holds q->vb_lock */
684static int stream_next_buffer(struct videobuf_queue *q,
685 struct videobuf_buffer **vb, int nonblocking)
686{
687 int retval;
688 struct videobuf_buffer *buf = NULL;
689
690 retval = stream_next_buffer_check_queue(q, nonblocking);
691 if (retval)
692 goto done;
693
694 buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
Hans Verkuil0e0809a2010-09-26 09:01:26 -0300695 retval = videobuf_waiton(q, buf, nonblocking, 1);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300696 if (retval < 0)
697 goto done;
698
699 *vb = buf;
700done:
701 return retval;
702}
703
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300704int videobuf_dqbuf(struct videobuf_queue *q,
Pawel Osciak7a022642010-03-17 04:01:04 -0300705 struct v4l2_buffer *b, int nonblocking)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300706{
Brandon Philips137d1cb2008-04-02 18:10:59 -0300707 struct videobuf_buffer *buf = NULL;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300708 int retval;
709
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300710 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300711
Hans Verkuilb2dfd1a2010-04-28 04:05:22 -0300712 memset(b, 0, sizeof(*b));
Hans Verkuil97397682010-09-20 17:24:30 -0300713 videobuf_queue_lock(q);
Brandon Philips137d1cb2008-04-02 18:10:59 -0300714
715 retval = stream_next_buffer(q, &buf, nonblocking);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300716 if (retval < 0) {
Brandon Philips137d1cb2008-04-02 18:10:59 -0300717 dprintk(1, "dqbuf: next_buffer error: %i\n", retval);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300718 goto done;
719 }
Brandon Philips137d1cb2008-04-02 18:10:59 -0300720
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300721 switch (buf->state) {
Brandon Philips0fc06862007-11-06 20:02:36 -0300722 case VIDEOBUF_ERROR:
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300723 dprintk(1, "dqbuf: state is error\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300724 break;
Brandon Philips0fc06862007-11-06 20:02:36 -0300725 case VIDEOBUF_DONE:
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300726 dprintk(1, "dqbuf: state is done\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300727 break;
728 default:
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300729 dprintk(1, "dqbuf: state invalid\n");
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300730 retval = -EINVAL;
731 goto done;
732 }
Hans Verkuilb2dfd1a2010-04-28 04:05:22 -0300733 CALL(q, sync, q, buf);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300734 videobuf_status(q, b, buf, q->type);
Hans Verkuilb2dfd1a2010-04-28 04:05:22 -0300735 list_del(&buf->stream);
736 buf->state = VIDEOBUF_IDLE;
737 b->flags &= ~V4L2_BUF_FLAG_DONE;
Pawel Osciak7a022642010-03-17 04:01:04 -0300738done:
Hans Verkuil97397682010-09-20 17:24:30 -0300739 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300740 return retval;
741}
Pawel Osciak7a022642010-03-17 04:01:04 -0300742EXPORT_SYMBOL_GPL(videobuf_dqbuf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300743
744int videobuf_streamon(struct videobuf_queue *q)
745{
746 struct videobuf_buffer *buf;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300747 unsigned long flags = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300748 int retval;
749
Hans Verkuil97397682010-09-20 17:24:30 -0300750 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300751 retval = -EBUSY;
752 if (q->reading)
753 goto done;
754 retval = 0;
755 if (q->streaming)
756 goto done;
757 q->streaming = 1;
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700758 spin_lock_irqsave(q->irqlock, flags);
Trent Piephoa991f442007-10-10 05:37:43 -0300759 list_for_each_entry(buf, &q->stream, stream)
Brandon Philips0fc06862007-11-06 20:02:36 -0300760 if (buf->state == VIDEOBUF_PREPARED)
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300761 q->ops->buf_queue(q, buf);
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700762 spin_unlock_irqrestore(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300763
Brandon Philips137d1cb2008-04-02 18:10:59 -0300764 wake_up_interruptible_sync(&q->wait);
Pawel Osciak7a022642010-03-17 04:01:04 -0300765done:
Hans Verkuil97397682010-09-20 17:24:30 -0300766 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300767 return retval;
768}
Pawel Osciak7a022642010-03-17 04:01:04 -0300769EXPORT_SYMBOL_GPL(videobuf_streamon);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300770
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300771/* Locking: Caller holds q->vb_lock */
Brandon Philips19bc5132007-11-13 20:05:38 -0300772static int __videobuf_streamoff(struct videobuf_queue *q)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300773{
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300774 if (!q->streaming)
Brandon Philips19bc5132007-11-13 20:05:38 -0300775 return -EINVAL;
776
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300777 videobuf_queue_cancel(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300778
Brandon Philips19bc5132007-11-13 20:05:38 -0300779 return 0;
780}
781
782int videobuf_streamoff(struct videobuf_queue *q)
783{
784 int retval;
785
Hans Verkuil97397682010-09-20 17:24:30 -0300786 videobuf_queue_lock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300787 retval = __videobuf_streamoff(q);
Hans Verkuil97397682010-09-20 17:24:30 -0300788 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -0300789
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300790 return retval;
791}
Pawel Osciak7a022642010-03-17 04:01:04 -0300792EXPORT_SYMBOL_GPL(videobuf_streamoff);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300793
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300794/* Locking: Caller holds q->vb_lock */
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300795static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
796 char __user *data,
797 size_t count, loff_t *ppos)
798{
799 enum v4l2_field field;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300800 unsigned long flags = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300801 int retval;
802
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300803 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300804
805 /* setup stuff */
Pawel Osciak33c38282010-05-11 10:36:28 -0300806 q->read_buf = videobuf_alloc_vb(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300807 if (NULL == q->read_buf)
808 return -ENOMEM;
809
810 q->read_buf->memory = V4L2_MEMORY_USERPTR;
811 q->read_buf->baddr = (unsigned long)data;
812 q->read_buf->bsize = count;
813
814 field = videobuf_next_field(q);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300815 retval = q->ops->buf_prepare(q, q->read_buf, field);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300816 if (0 != retval)
817 goto done;
818
819 /* start capture & wait */
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700820 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300821 q->ops->buf_queue(q, q->read_buf);
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700822 spin_unlock_irqrestore(q->irqlock, flags);
Hans Verkuil0e0809a2010-09-26 09:01:26 -0300823 retval = videobuf_waiton(q, q->read_buf, 0, 0);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300824 if (0 == retval) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300825 CALL(q, sync, q, q->read_buf);
Brandon Philips0fc06862007-11-06 20:02:36 -0300826 if (VIDEOBUF_ERROR == q->read_buf->state)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300827 retval = -EIO;
828 else
829 retval = q->read_buf->size;
830 }
831
Pawel Osciak7a022642010-03-17 04:01:04 -0300832done:
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300833 /* cleanup */
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300834 q->ops->buf_release(q, q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300835 kfree(q->read_buf);
836 q->read_buf = NULL;
837 return retval;
838}
839
Hans Verkuil37111032010-03-28 09:22:53 -0300840static int __videobuf_copy_to_user(struct videobuf_queue *q,
841 struct videobuf_buffer *buf,
842 char __user *data, size_t count,
843 int nonblocking)
844{
845 void *vaddr = CALL(q, vaddr, buf);
846
847 /* copy to userspace */
848 if (count > buf->size - q->read_off)
849 count = buf->size - q->read_off;
850
851 if (copy_to_user(data, vaddr + q->read_off, count))
852 return -EFAULT;
853
854 return count;
855}
856
857static int __videobuf_copy_stream(struct videobuf_queue *q,
858 struct videobuf_buffer *buf,
859 char __user *data, size_t count, size_t pos,
860 int vbihack, int nonblocking)
861{
862 unsigned int *fc = CALL(q, vaddr, buf);
863
864 if (vbihack) {
865 /* dirty, undocumented hack -- pass the frame counter
866 * within the last four bytes of each vbi data block.
867 * We need that one to maintain backward compatibility
868 * to all vbi decoding software out there ... */
869 fc += (buf->size >> 2) - 1;
870 *fc = buf->field_count >> 1;
871 dprintk(1, "vbihack: %d\n", *fc);
872 }
873
874 /* copy stuff using the common method */
875 count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
876
877 if ((count == -EFAULT) && (pos == 0))
878 return -EFAULT;
879
880 return count;
881}
882
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300883ssize_t videobuf_read_one(struct videobuf_queue *q,
884 char __user *data, size_t count, loff_t *ppos,
885 int nonblocking)
886{
887 enum v4l2_field field;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300888 unsigned long flags = 0;
Guennadi Liakhovetski7daa4a82008-04-22 14:46:03 -0300889 unsigned size = 0, nbufs = 1;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300890 int retval;
891
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300892 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300893
Hans Verkuil97397682010-09-20 17:24:30 -0300894 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300895
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300896 q->ops->buf_setup(q, &nbufs, &size);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300897
898 if (NULL == q->read_buf &&
899 count >= size &&
900 !nonblocking) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300901 retval = videobuf_read_zerocopy(q, data, count, ppos);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300902 if (retval >= 0 || retval == -EIO)
903 /* ok, all done */
904 goto done;
905 /* fallback to kernel bounce buffer on failures */
906 }
907
908 if (NULL == q->read_buf) {
909 /* need to capture a new frame */
910 retval = -ENOMEM;
Pawel Osciak33c38282010-05-11 10:36:28 -0300911 q->read_buf = videobuf_alloc_vb(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300912
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300913 dprintk(1, "video alloc=0x%p\n", q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300914 if (NULL == q->read_buf)
915 goto done;
916 q->read_buf->memory = V4L2_MEMORY_USERPTR;
917 q->read_buf->bsize = count; /* preferred size */
918 field = videobuf_next_field(q);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300919 retval = q->ops->buf_prepare(q, q->read_buf, field);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300920
921 if (0 != retval) {
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300922 kfree(q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300923 q->read_buf = NULL;
924 goto done;
925 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300926
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700927 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300928 q->ops->buf_queue(q, q->read_buf);
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700929 spin_unlock_irqrestore(q->irqlock, flags);
930
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300931 q->read_off = 0;
932 }
933
934 /* wait until capture is done */
Hans Verkuil0e0809a2010-09-26 09:01:26 -0300935 retval = videobuf_waiton(q, q->read_buf, nonblocking, 1);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300936 if (0 != retval)
937 goto done;
938
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300939 CALL(q, sync, q, q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300940
Brandon Philips0fc06862007-11-06 20:02:36 -0300941 if (VIDEOBUF_ERROR == q->read_buf->state) {
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300942 /* catch I/O errors */
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300943 q->ops->buf_release(q, q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300944 kfree(q->read_buf);
945 q->read_buf = NULL;
946 retval = -EIO;
947 goto done;
948 }
949
950 /* Copy to userspace */
Hans Verkuil37111032010-03-28 09:22:53 -0300951 retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300952 if (retval < 0)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300953 goto done;
954
955 q->read_off += retval;
956 if (q->read_off == q->read_buf->size) {
957 /* all data copied, cleanup */
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300958 q->ops->buf_release(q, q->read_buf);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300959 kfree(q->read_buf);
960 q->read_buf = NULL;
961 }
962
Pawel Osciak7a022642010-03-17 04:01:04 -0300963done:
Hans Verkuil97397682010-09-20 17:24:30 -0300964 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300965 return retval;
966}
Pawel Osciak7a022642010-03-17 04:01:04 -0300967EXPORT_SYMBOL_GPL(videobuf_read_one);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300968
Mauro Carvalho Chehab64f94772008-01-31 13:57:53 -0300969/* Locking: Caller holds q->vb_lock */
Mauro Carvalho Chehab225ba902007-12-12 21:46:26 -0300970static int __videobuf_read_start(struct videobuf_queue *q)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300971{
972 enum v4l2_field field;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300973 unsigned long flags = 0;
Brandon Philips49ee7182007-10-05 16:26:27 -0300974 unsigned int count = 0, size = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300975 int err, i;
976
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300977 q->ops->buf_setup(q, &count, &size);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300978 if (count < 2)
979 count = 2;
980 if (count > VIDEO_MAX_FRAME)
981 count = VIDEO_MAX_FRAME;
982 size = PAGE_ALIGN(size);
983
Brandon Philips19bc5132007-11-13 20:05:38 -0300984 err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
Brandon Philips49ee7182007-10-05 16:26:27 -0300985 if (err < 0)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300986 return err;
987
Brandon Philips49ee7182007-10-05 16:26:27 -0300988 count = err;
989
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300990 for (i = 0; i < count; i++) {
991 field = videobuf_next_field(q);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300992 err = q->ops->buf_prepare(q, q->bufs[i], field);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300993 if (err)
994 return err;
995 list_add_tail(&q->bufs[i]->stream, &q->stream);
996 }
Brandon Philips0cf4dae2008-03-28 10:18:33 -0700997 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -0300998 for (i = 0; i < count; i++)
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -0300999 q->ops->buf_queue(q, q->bufs[i]);
Brandon Philips0cf4dae2008-03-28 10:18:33 -07001000 spin_unlock_irqrestore(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001001 q->reading = 1;
1002 return 0;
1003}
1004
Brandon Philips19bc5132007-11-13 20:05:38 -03001005static void __videobuf_read_stop(struct videobuf_queue *q)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001006{
1007 int i;
1008
1009 videobuf_queue_cancel(q);
Pawel Osciaka438d6d2010-05-11 10:36:29 -03001010 __videobuf_free(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001011 INIT_LIST_HEAD(&q->stream);
1012 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1013 if (NULL == q->bufs[i])
1014 continue;
1015 kfree(q->bufs[i]);
1016 q->bufs[i] = NULL;
1017 }
1018 q->read_buf = NULL;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001019}
1020
Mauro Carvalho Chehab19fb1452007-11-15 23:09:30 -03001021int videobuf_read_start(struct videobuf_queue *q)
1022{
1023 int rc;
1024
Hans Verkuil97397682010-09-20 17:24:30 -03001025 videobuf_queue_lock(q);
Mauro Carvalho Chehab19fb1452007-11-15 23:09:30 -03001026 rc = __videobuf_read_start(q);
Hans Verkuil97397682010-09-20 17:24:30 -03001027 videobuf_queue_unlock(q);
Mauro Carvalho Chehab19fb1452007-11-15 23:09:30 -03001028
1029 return rc;
1030}
Pawel Osciak7a022642010-03-17 04:01:04 -03001031EXPORT_SYMBOL_GPL(videobuf_read_start);
Mauro Carvalho Chehab19fb1452007-11-15 23:09:30 -03001032
Brandon Philips19bc5132007-11-13 20:05:38 -03001033void videobuf_read_stop(struct videobuf_queue *q)
1034{
Hans Verkuil97397682010-09-20 17:24:30 -03001035 videobuf_queue_lock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -03001036 __videobuf_read_stop(q);
Hans Verkuil97397682010-09-20 17:24:30 -03001037 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -03001038}
Pawel Osciak7a022642010-03-17 04:01:04 -03001039EXPORT_SYMBOL_GPL(videobuf_read_stop);
Brandon Philips19bc5132007-11-13 20:05:38 -03001040
1041void videobuf_stop(struct videobuf_queue *q)
1042{
Hans Verkuil97397682010-09-20 17:24:30 -03001043 videobuf_queue_lock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -03001044
1045 if (q->streaming)
1046 __videobuf_streamoff(q);
1047
1048 if (q->reading)
1049 __videobuf_read_stop(q);
1050
Hans Verkuil97397682010-09-20 17:24:30 -03001051 videobuf_queue_unlock(q);
Brandon Philips19bc5132007-11-13 20:05:38 -03001052}
Pawel Osciak7a022642010-03-17 04:01:04 -03001053EXPORT_SYMBOL_GPL(videobuf_stop);
Brandon Philips19bc5132007-11-13 20:05:38 -03001054
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001055ssize_t videobuf_read_stream(struct videobuf_queue *q,
1056 char __user *data, size_t count, loff_t *ppos,
1057 int vbihack, int nonblocking)
1058{
1059 int rc, retval;
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -03001060 unsigned long flags = 0;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001061
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -03001062 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001063
Harvey Harrison7e28adb2008-04-08 23:20:00 -03001064 dprintk(2, "%s\n", __func__);
Hans Verkuil97397682010-09-20 17:24:30 -03001065 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001066 retval = -EBUSY;
1067 if (q->streaming)
1068 goto done;
1069 if (!q->reading) {
Adrian Bunk3f843072007-12-12 16:44:54 -03001070 retval = __videobuf_read_start(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001071 if (retval < 0)
1072 goto done;
1073 }
1074
1075 retval = 0;
1076 while (count > 0) {
1077 /* get / wait for data */
1078 if (NULL == q->read_buf) {
1079 q->read_buf = list_entry(q->stream.next,
1080 struct videobuf_buffer,
1081 stream);
1082 list_del(&q->read_buf->stream);
1083 q->read_off = 0;
1084 }
Hans Verkuil0e0809a2010-09-26 09:01:26 -03001085 rc = videobuf_waiton(q, q->read_buf, nonblocking, 1);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001086 if (rc < 0) {
1087 if (0 == retval)
1088 retval = rc;
1089 break;
1090 }
1091
Brandon Philips0fc06862007-11-06 20:02:36 -03001092 if (q->read_buf->state == VIDEOBUF_DONE) {
Hans Verkuil37111032010-03-28 09:22:53 -03001093 rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001094 retval, vbihack, nonblocking);
1095 if (rc < 0) {
1096 retval = rc;
1097 break;
1098 }
1099 retval += rc;
1100 count -= rc;
1101 q->read_off += rc;
1102 } else {
1103 /* some error */
1104 q->read_off = q->read_buf->size;
1105 if (0 == retval)
1106 retval = -EIO;
1107 }
1108
1109 /* requeue buffer when done with copying */
1110 if (q->read_off == q->read_buf->size) {
1111 list_add_tail(&q->read_buf->stream,
1112 &q->stream);
Brandon Philips0cf4dae2008-03-28 10:18:33 -07001113 spin_lock_irqsave(q->irqlock, flags);
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -03001114 q->ops->buf_queue(q, q->read_buf);
Brandon Philips0cf4dae2008-03-28 10:18:33 -07001115 spin_unlock_irqrestore(q->irqlock, flags);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001116 q->read_buf = NULL;
1117 }
1118 if (retval < 0)
1119 break;
1120 }
1121
Pawel Osciak7a022642010-03-17 04:01:04 -03001122done:
Hans Verkuil97397682010-09-20 17:24:30 -03001123 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001124 return retval;
1125}
Pawel Osciak7a022642010-03-17 04:01:04 -03001126EXPORT_SYMBOL_GPL(videobuf_read_stream);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001127
1128unsigned int videobuf_poll_stream(struct file *file,
1129 struct videobuf_queue *q,
1130 poll_table *wait)
1131{
1132 struct videobuf_buffer *buf = NULL;
1133 unsigned int rc = 0;
1134
Hans Verkuil97397682010-09-20 17:24:30 -03001135 videobuf_queue_lock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001136 if (q->streaming) {
1137 if (!list_empty(&q->stream))
1138 buf = list_entry(q->stream.next,
1139 struct videobuf_buffer, stream);
1140 } else {
1141 if (!q->reading)
Adrian Bunk3f843072007-12-12 16:44:54 -03001142 __videobuf_read_start(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001143 if (!q->reading) {
1144 rc = POLLERR;
1145 } else if (NULL == q->read_buf) {
1146 q->read_buf = list_entry(q->stream.next,
1147 struct videobuf_buffer,
1148 stream);
1149 list_del(&q->read_buf->stream);
1150 q->read_off = 0;
1151 }
1152 buf = q->read_buf;
1153 }
1154 if (!buf)
1155 rc = POLLERR;
1156
1157 if (0 == rc) {
1158 poll_wait(file, &buf->done, wait);
Brandon Philips0fc06862007-11-06 20:02:36 -03001159 if (buf->state == VIDEOBUF_DONE ||
Pawel Osciak9b558432010-03-29 05:16:31 -03001160 buf->state == VIDEOBUF_ERROR) {
1161 switch (q->type) {
1162 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1163 case V4L2_BUF_TYPE_VBI_OUTPUT:
1164 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1165 rc = POLLOUT | POLLWRNORM;
1166 break;
1167 default:
1168 rc = POLLIN | POLLRDNORM;
1169 break;
1170 }
1171 }
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001172 }
Hans Verkuil97397682010-09-20 17:24:30 -03001173 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001174 return rc;
1175}
Pawel Osciak7a022642010-03-17 04:01:04 -03001176EXPORT_SYMBOL_GPL(videobuf_poll_stream);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001177
Pawel Osciak7a022642010-03-17 04:01:04 -03001178int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma)
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001179{
Hans Verkuil0b62b732010-03-28 09:09:05 -03001180 int rc = -EINVAL;
1181 int i;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001182
Mauro Carvalho Chehabe2c77312007-12-10 10:53:20 -03001183 MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001184
Hans Verkuil0b62b732010-03-28 09:09:05 -03001185 if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) {
1186 dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n");
1187 return -EINVAL;
1188 }
1189
Hans Verkuil97397682010-09-20 17:24:30 -03001190 videobuf_queue_lock(q);
Hans Verkuil0b62b732010-03-28 09:09:05 -03001191 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1192 struct videobuf_buffer *buf = q->bufs[i];
1193
1194 if (buf && buf->memory == V4L2_MEMORY_MMAP &&
1195 buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) {
1196 rc = CALL(q, mmap_mapper, q, buf, vma);
1197 break;
1198 }
1199 }
Hans Verkuil97397682010-09-20 17:24:30 -03001200 videobuf_queue_unlock(q);
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001201
Hans Verkuil0b62b732010-03-28 09:09:05 -03001202 return rc;
Mauro Carvalho Chehab7a7d9a82007-08-23 16:26:14 -03001203}
Pawel Osciak7a022642010-03-17 04:01:04 -03001204EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);