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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6-omap-h63xx.git] / drivers / media / video / cx18 / cx18-fileops.c
1 /*
2  *  cx18 file operation functions
3  *
4  *  Derived from ivtv-fileops.c
5  *
6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21  *  02111-1307  USA
22  */
23
24 #include "cx18-driver.h"
25 #include "cx18-fileops.h"
26 #include "cx18-i2c.h"
27 #include "cx18-queue.h"
28 #include "cx18-vbi.h"
29 #include "cx18-audio.h"
30 #include "cx18-mailbox.h"
31 #include "cx18-scb.h"
32 #include "cx18-streams.h"
33 #include "cx18-controls.h"
34 #include "cx18-ioctl.h"
35 #include "cx18-cards.h"
36
37 /* This function tries to claim the stream for a specific file descriptor.
38    If no one else is using this stream then the stream is claimed and
39    associated VBI streams are also automatically claimed.
40    Possible error returns: -EBUSY if someone else has claimed
41    the stream or 0 on success. */
42 static int cx18_claim_stream(struct cx18_open_id *id, int type)
43 {
44         struct cx18 *cx = id->cx;
45         struct cx18_stream *s = &cx->streams[type];
46         struct cx18_stream *s_vbi;
47         int vbi_type;
48
49         if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
50                 /* someone already claimed this stream */
51                 if (s->id == id->open_id) {
52                         /* yes, this file descriptor did. So that's OK. */
53                         return 0;
54                 }
55                 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
56                         /* VBI is handled already internally, now also assign
57                            the file descriptor to this stream for external
58                            reading of the stream. */
59                         s->id = id->open_id;
60                         CX18_DEBUG_INFO("Start Read VBI\n");
61                         return 0;
62                 }
63                 /* someone else is using this stream already */
64                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
65                 return -EBUSY;
66         }
67         s->id = id->open_id;
68
69         /* CX18_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI,
70            CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
71            (provided VBI insertion is on and sliced VBI is selected), for all
72            other streams we're done */
73         if (type == CX18_ENC_STREAM_TYPE_MPG &&
74                    cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) {
75                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
76         } else {
77                 return 0;
78         }
79         s_vbi = &cx->streams[vbi_type];
80
81         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
82
83         /* mark that it is used internally */
84         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
85         return 0;
86 }
87
88 /* This function releases a previously claimed stream. It will take into
89    account associated VBI streams. */
90 static void cx18_release_stream(struct cx18_stream *s)
91 {
92         struct cx18 *cx = s->cx;
93         struct cx18_stream *s_vbi;
94
95         s->id = -1;
96         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
97                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
98                 /* this stream is still in use internally */
99                 return;
100         }
101         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
102                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
103                 return;
104         }
105
106         cx18_flush_queues(s);
107
108         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
109            for all other streams we're done */
110         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
111                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
112         else
113                 return;
114
115         /* clear internal use flag */
116         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
117                 /* was already cleared */
118                 return;
119         }
120         if (s_vbi->id != -1) {
121                 /* VBI stream still claimed by a file descriptor */
122                 return;
123         }
124         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
125         cx18_flush_queues(s_vbi);
126 }
127
128 static void cx18_dualwatch(struct cx18 *cx)
129 {
130         struct v4l2_tuner vt;
131         u16 new_bitmap;
132         u16 new_stereo_mode;
133         const u16 stereo_mask = 0x0300;
134         const u16 dual = 0x0200;
135
136         new_stereo_mode = cx->params.audio_properties & stereo_mask;
137         memset(&vt, 0, sizeof(vt));
138         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
139         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
140                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
141                 new_stereo_mode = dual;
142
143         if (new_stereo_mode == cx->dualwatch_stereo_mode)
144                 return;
145
146         new_bitmap = new_stereo_mode | (cx->params.audio_properties & ~stereo_mask);
147
148         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
149                            cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
150
151         if (cx18_vapi(cx, CX18_CPU_SET_AUDIO_PARAMETERS, 2,
152                                 cx18_find_handle(cx), new_bitmap) == 0) {
153                 cx->dualwatch_stereo_mode = new_stereo_mode;
154                 return;
155         }
156         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
157 }
158
159
160 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
161 {
162         struct cx18 *cx = s->cx;
163         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
164         struct cx18_buffer *buf;
165         DEFINE_WAIT(wait);
166
167         *err = 0;
168         while (1) {
169                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
170
171                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
172                                 cx->dualwatch_jiffies = jiffies;
173                                 cx18_dualwatch(cx);
174                         }
175                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
176                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
177                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
178                                         /* byteswap and process VBI data */
179 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
180                                         cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
181                                 }
182                         }
183                         buf = &cx->vbi.sliced_mpeg_buf;
184                         if (buf->readpos != buf->bytesused)
185                                 return buf;
186                 }
187
188                 /* do we have leftover data? */
189                 buf = cx18_dequeue(s, &s->q_io);
190                 if (buf)
191                         return buf;
192
193                 /* do we have new data? */
194                 buf = cx18_dequeue(s, &s->q_full);
195                 if (buf) {
196                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
197                                                 &buf->b_flags))
198                                 return buf;
199                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
200                                 /* byteswap MPG data */
201                                 cx18_buf_swap(buf);
202                         else {
203                                 /* byteswap and process VBI data */
204                                 cx18_process_vbi_data(cx, buf,
205                                                 s->dma_pts, s->type);
206                         }
207                         return buf;
208                 }
209
210                 /* return if end of stream */
211                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
212                         CX18_DEBUG_INFO("EOS %s\n", s->name);
213                         return NULL;
214                 }
215
216                 /* return if file was opened with O_NONBLOCK */
217                 if (non_block) {
218                         *err = -EAGAIN;
219                         return NULL;
220                 }
221
222                 /* wait for more data to arrive */
223                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
224                 /* New buffers might have become available before we were added
225                    to the waitqueue */
226                 if (!s->q_full.buffers)
227                         schedule();
228                 finish_wait(&s->waitq, &wait);
229                 if (signal_pending(current)) {
230                         /* return if a signal was received */
231                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
232                         *err = -EINTR;
233                         return NULL;
234                 }
235         }
236 }
237
238 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
239 {
240         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
241
242         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
243         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
244         cx->vbi.sliced_mpeg_buf.readpos = 0;
245 }
246
247 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
248                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
249 {
250         struct cx18 *cx = s->cx;
251         size_t len = buf->bytesused - buf->readpos;
252
253         if (len > ucount)
254                 len = ucount;
255         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
256             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
257                 const char *start = buf->buf + buf->readpos;
258                 const char *p = start + 1;
259                 const u8 *q;
260                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
261                 int stuffing, i;
262
263                 while (start + len > p) {
264                         q = memchr(p, 0, start + len - p);
265                         if (q == NULL)
266                                 break;
267                         p = q + 1;
268                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
269                             q[1] != 0 || q[2] != 1 || q[3] != ch)
270                                 continue;
271                         if (!cx->search_pack_header) {
272                                 if ((q[6] & 0xc0) != 0x80)
273                                         continue;
274                                 if (((q[7] & 0xc0) == 0x80 &&
275                                      (q[9] & 0xf0) == 0x20) ||
276                                     ((q[7] & 0xc0) == 0xc0 &&
277                                      (q[9] & 0xf0) == 0x30)) {
278                                         ch = 0xba;
279                                         cx->search_pack_header = 1;
280                                         p = q + 9;
281                                 }
282                                 continue;
283                         }
284                         stuffing = q[13] & 7;
285                         /* all stuffing bytes must be 0xff */
286                         for (i = 0; i < stuffing; i++)
287                                 if (q[14 + i] != 0xff)
288                                         break;
289                         if (i == stuffing &&
290                             (q[4] & 0xc4) == 0x44 &&
291                             (q[12] & 3) == 3 &&
292                             q[14 + stuffing] == 0 &&
293                             q[15 + stuffing] == 0 &&
294                             q[16 + stuffing] == 1) {
295                                 cx->search_pack_header = 0;
296                                 len = (char *)q - start;
297                                 cx18_setup_sliced_vbi_buf(cx);
298                                 break;
299                         }
300                 }
301         }
302         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
303                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
304                                 len, s->name);
305                 return -EFAULT;
306         }
307         buf->readpos += len;
308         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
309             buf != &cx->vbi.sliced_mpeg_buf)
310                 cx->mpg_data_received += len;
311         return len;
312 }
313
314 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
315                 size_t tot_count, int non_block)
316 {
317         struct cx18 *cx = s->cx;
318         size_t tot_written = 0;
319         int single_frame = 0;
320
321         if (atomic_read(&cx->capturing) == 0 && s->id == -1) {
322                 /* shouldn't happen */
323                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
324                                 s->name);
325                 return -EIO;
326         }
327
328         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
329            frames should arrive one-by-one, so make sure we never output more
330            than one VBI frame at a time */
331         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
332             cx->vbi.sliced_in->service_set)
333                 single_frame = 1;
334
335         for (;;) {
336                 struct cx18_buffer *buf;
337                 int rc;
338
339                 buf = cx18_get_buffer(s, non_block, &rc);
340                 /* if there is no data available... */
341                 if (buf == NULL) {
342                         /* if we got data, then return that regardless */
343                         if (tot_written)
344                                 break;
345                         /* EOS condition */
346                         if (rc == 0) {
347                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
348                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
349                                 cx18_release_stream(s);
350                         }
351                         /* set errno */
352                         return rc;
353                 }
354
355                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
356                                 tot_count - tot_written);
357
358                 if (buf != &cx->vbi.sliced_mpeg_buf) {
359                         if (buf->readpos == buf->bytesused) {
360                                 cx18_buf_sync_for_device(s, buf);
361                                 cx18_enqueue(s, buf, &s->q_free);
362                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
363                                         s->handle,
364                                         (void *)&cx->scb->cpu_mdl[buf->id] - cx->enc_mem,
365                                         1, buf->id, s->buf_size);
366                         } else
367                                 cx18_enqueue(s, buf, &s->q_io);
368                 } else if (buf->readpos == buf->bytesused) {
369                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
370
371                         cx->vbi.sliced_mpeg_size[idx] = 0;
372                         cx->vbi.inserted_frame++;
373                         cx->vbi_data_inserted += buf->bytesused;
374                 }
375                 if (rc < 0)
376                         return rc;
377                 tot_written += rc;
378
379                 if (tot_written == tot_count || single_frame)
380                         break;
381         }
382         return tot_written;
383 }
384
385 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
386                 size_t count, loff_t *pos, int non_block)
387 {
388         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
389         struct cx18 *cx = s->cx;
390
391         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
392         if (rc > 0)
393                 pos += rc;
394         return rc;
395 }
396
397 int cx18_start_capture(struct cx18_open_id *id)
398 {
399         struct cx18 *cx = id->cx;
400         struct cx18_stream *s = &cx->streams[id->type];
401         struct cx18_stream *s_vbi;
402
403         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
404                 /* you cannot read from these stream types. */
405                 return -EPERM;
406         }
407
408         /* Try to claim this stream. */
409         if (cx18_claim_stream(id, s->type))
410                 return -EBUSY;
411
412         /* If capture is already in progress, then we also have to
413            do nothing extra. */
414         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
415             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
416                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
417                 return 0;
418         }
419
420         /* Start VBI capture if required */
421         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
422         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
423             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
424             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
425                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
426                    automatically when the MPG stream is claimed.
427                    We only need to start the VBI capturing. */
428                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
429                         CX18_DEBUG_WARN("VBI capture start failed\n");
430
431                         /* Failure, clean up and return an error */
432                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
433                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
434                         /* also releases the associated VBI stream */
435                         cx18_release_stream(s);
436                         return -EIO;
437                 }
438                 CX18_DEBUG_INFO("VBI insertion started\n");
439         }
440
441         /* Tell the card to start capturing */
442         if (!cx18_start_v4l2_encode_stream(s)) {
443                 /* We're done */
444                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
445                 /* Resume a possibly paused encoder */
446                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
447                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
448                 return 0;
449         }
450
451         /* failure, clean up */
452         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
453
454         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
455            automatically when the MPG stream is released.
456            We only need to stop the VBI capturing. */
457         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
458             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
459                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
460                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
461         }
462         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
463         cx18_release_stream(s);
464         return -EIO;
465 }
466
467 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
468                 loff_t *pos)
469 {
470         struct cx18_open_id *id = filp->private_data;
471         struct cx18 *cx = id->cx;
472         struct cx18_stream *s = &cx->streams[id->type];
473         int rc;
474
475         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
476
477         mutex_lock(&cx->serialize_lock);
478         rc = cx18_start_capture(id);
479         mutex_unlock(&cx->serialize_lock);
480         if (rc)
481                 return rc;
482         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
483 }
484
485 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
486 {
487         struct cx18_open_id *id = filp->private_data;
488         struct cx18 *cx = id->cx;
489         struct cx18_stream *s = &cx->streams[id->type];
490         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
491
492         /* Start a capture if there is none */
493         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
494                 int rc;
495
496                 mutex_lock(&cx->serialize_lock);
497                 rc = cx18_start_capture(id);
498                 mutex_unlock(&cx->serialize_lock);
499                 if (rc) {
500                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
501                                         s->name, rc);
502                         return POLLERR;
503                 }
504                 CX18_DEBUG_FILE("Encoder poll started capture\n");
505         }
506
507         /* add stream's waitq to the poll list */
508         CX18_DEBUG_HI_FILE("Encoder poll\n");
509         poll_wait(filp, &s->waitq, wait);
510
511         if (s->q_full.length || s->q_io.length)
512                 return POLLIN | POLLRDNORM;
513         if (eof)
514                 return POLLHUP;
515         return 0;
516 }
517
518 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
519 {
520         struct cx18 *cx = id->cx;
521         struct cx18_stream *s = &cx->streams[id->type];
522
523         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
524
525         /* 'Unclaim' this stream */
526
527         /* Stop capturing */
528         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
529                 struct cx18_stream *s_vbi =
530                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
531
532                 CX18_DEBUG_INFO("close stopping capture\n");
533                 /* Special case: a running VBI capture for VBI insertion
534                    in the mpeg stream. Need to stop that too. */
535                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
536                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
537                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
538                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
539                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
540                 }
541                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
542                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
543                         /* Also used internally, don't stop capturing */
544                         s->id = -1;
545                 else
546                         cx18_stop_v4l2_encode_stream(s, gop_end);
547         }
548         if (!gop_end) {
549                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
550                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
551                 cx18_release_stream(s);
552         }
553 }
554
555 int cx18_v4l2_close(struct inode *inode, struct file *filp)
556 {
557         struct cx18_open_id *id = filp->private_data;
558         struct cx18 *cx = id->cx;
559         struct cx18_stream *s = &cx->streams[id->type];
560
561         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
562
563         v4l2_prio_close(&cx->prio, &id->prio);
564
565         /* Easy case first: this stream was never claimed by us */
566         if (s->id != id->open_id) {
567                 kfree(id);
568                 return 0;
569         }
570
571         /* 'Unclaim' this stream */
572
573         /* Stop radio */
574         mutex_lock(&cx->serialize_lock);
575         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
576                 /* Closing radio device, return to TV mode */
577                 cx18_mute(cx);
578                 /* Mark that the radio is no longer in use */
579                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
580                 /* Switch tuner to TV */
581                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
582                 /* Select correct audio input (i.e. TV tuner or Line in) */
583                 cx18_audio_set_io(cx);
584                 if (atomic_read(&cx->capturing) > 0) {
585                         /* Undo video mute */
586                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
587                                 cx->params.video_mute |
588                                         (cx->params.video_mute_yuv << 8));
589                 }
590                 /* Done! Unmute and continue. */
591                 cx18_unmute(cx);
592                 cx18_release_stream(s);
593         } else {
594                 cx18_stop_capture(id, 0);
595         }
596         kfree(id);
597         mutex_unlock(&cx->serialize_lock);
598         return 0;
599 }
600
601 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
602 {
603         struct cx18 *cx = s->cx;
604         struct cx18_open_id *item;
605
606         CX18_DEBUG_FILE("open %s\n", s->name);
607
608         /* Allocate memory */
609         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
610         if (NULL == item) {
611                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
612                 return -ENOMEM;
613         }
614         item->cx = cx;
615         item->type = s->type;
616         v4l2_prio_open(&cx->prio, &item->prio);
617
618         item->open_id = cx->open_id++;
619         filp->private_data = item;
620
621         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
622                 /* Try to claim this stream */
623                 if (cx18_claim_stream(item, item->type)) {
624                         /* No, it's already in use */
625                         kfree(item);
626                         return -EBUSY;
627                 }
628
629                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
630                         if (atomic_read(&cx->capturing) > 0) {
631                                 /* switching to radio while capture is
632                                    in progress is not polite */
633                                 cx18_release_stream(s);
634                                 kfree(item);
635                                 return -EBUSY;
636                         }
637                 }
638
639                 /* Mark that the radio is being used. */
640                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
641                 /* We have the radio */
642                 cx18_mute(cx);
643                 /* Switch tuner to radio */
644                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
645                 /* Select the correct audio input (i.e. radio tuner) */
646                 cx18_audio_set_io(cx);
647                 /* Done! Unmute and continue. */
648                 cx18_unmute(cx);
649         }
650         return 0;
651 }
652
653 int cx18_v4l2_open(struct inode *inode, struct file *filp)
654 {
655         int res, x, y = 0;
656         struct cx18 *cx = NULL;
657         struct cx18_stream *s = NULL;
658         int minor = iminor(inode);
659
660         /* Find which card this open was on */
661         spin_lock(&cx18_cards_lock);
662         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
663                 /* find out which stream this open was on */
664                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
665                         if (cx18_cards[x] == NULL)
666                                 continue;
667                         s = &cx18_cards[x]->streams[y];
668                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
669                                 cx = cx18_cards[x];
670                                 break;
671                         }
672                 }
673         }
674         spin_unlock(&cx18_cards_lock);
675
676         if (cx == NULL) {
677                 /* Couldn't find a device registered
678                    on that minor, shouldn't happen! */
679                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
680                                 minor);
681                 return -ENXIO;
682         }
683
684         mutex_lock(&cx->serialize_lock);
685         if (cx18_init_on_first_open(cx)) {
686                 CX18_ERR("Failed to initialize on minor %d\n", minor);
687                 mutex_unlock(&cx->serialize_lock);
688                 return -ENXIO;
689         }
690         res = cx18_serialized_open(s, filp);
691         mutex_unlock(&cx->serialize_lock);
692         return res;
693 }
694
695 void cx18_mute(struct cx18 *cx)
696 {
697         if (atomic_read(&cx->capturing))
698                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
699                                 cx18_find_handle(cx), 1);
700         CX18_DEBUG_INFO("Mute\n");
701 }
702
703 void cx18_unmute(struct cx18 *cx)
704 {
705         if (atomic_read(&cx->capturing)) {
706                 cx18_msleep_timeout(100, 0);
707                 cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2,
708                                 cx18_find_handle(cx), 12);
709                 cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2,
710                                 cx18_find_handle(cx), 0);
711         }
712         CX18_DEBUG_INFO("Unmute\n");
713 }