1 /*
2     file operation functions
3     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
4     Copyright (C) 2004  Chris Kennedy <c@groovy.org>
5     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
6 
7     This program is free software; you can redistribute it and/or modify
8     it under the terms of the GNU General Public License as published by
9     the Free Software Foundation; either version 2 of the License, or
10     (at your option) any later version.
11 
12     This program is distributed in the hope that it will be useful,
13     but WITHOUT ANY WARRANTY; without even the implied warranty of
14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15     GNU General Public License for more details.
16 
17     You should have received a copy of the GNU General Public License
18     along with this program; if not, write to the Free Software
19     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 
22 #include "ivtv-driver.h"
23 #include "ivtv-fileops.h"
24 #include "ivtv-i2c.h"
25 #include "ivtv-queue.h"
26 #include "ivtv-udma.h"
27 #include "ivtv-irq.h"
28 #include "ivtv-vbi.h"
29 #include "ivtv-mailbox.h"
30 #include "ivtv-routing.h"
31 #include "ivtv-streams.h"
32 #include "ivtv-yuv.h"
33 #include "ivtv-ioctl.h"
34 #include "ivtv-cards.h"
35 #include "ivtv-firmware.h"
36 #include <media/v4l2-event.h>
37 #include <media/i2c/saa7115.h>
38 
39 /* This function tries to claim the stream for a specific file descriptor.
40    If no one else is using this stream then the stream is claimed and
41    associated VBI streams are also automatically claimed.
42    Possible error returns: -EBUSY if someone else has claimed
43    the stream or 0 on success. */
44 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
45 {
46 	struct ivtv *itv = id->itv;
47 	struct ivtv_stream *s = &itv->streams[type];
48 	struct ivtv_stream *s_vbi;
49 	int vbi_type;
50 
51 	if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
52 		/* someone already claimed this stream */
53 		if (s->fh == &id->fh) {
54 			/* yes, this file descriptor did. So that's OK. */
55 			return 0;
56 		}
57 		if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
58 					 type == IVTV_ENC_STREAM_TYPE_VBI)) {
59 			/* VBI is handled already internally, now also assign
60 			   the file descriptor to this stream for external
61 			   reading of the stream. */
62 			s->fh = &id->fh;
63 			IVTV_DEBUG_INFO("Start Read VBI\n");
64 			return 0;
65 		}
66 		/* someone else is using this stream already */
67 		IVTV_DEBUG_INFO("Stream %d is busy\n", type);
68 		return -EBUSY;
69 	}
70 	s->fh = &id->fh;
71 	if (type == IVTV_DEC_STREAM_TYPE_VBI) {
72 		/* Enable reinsertion interrupt */
73 		ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
74 	}
75 
76 	/* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
77 	   IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
78 	   (provided VBI insertion is on and sliced VBI is selected), for all
79 	   other streams we're done */
80 	if (type == IVTV_DEC_STREAM_TYPE_MPG) {
81 		vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
82 	} else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
83 		   itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
84 		vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
85 	} else {
86 		return 0;
87 	}
88 	s_vbi = &itv->streams[vbi_type];
89 
90 	if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
91 		/* Enable reinsertion interrupt */
92 		if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
93 			ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
94 	}
95 	/* mark that it is used internally */
96 	set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
97 	return 0;
98 }
99 EXPORT_SYMBOL(ivtv_claim_stream);
100 
101 /* This function releases a previously claimed stream. It will take into
102    account associated VBI streams. */
103 void ivtv_release_stream(struct ivtv_stream *s)
104 {
105 	struct ivtv *itv = s->itv;
106 	struct ivtv_stream *s_vbi;
107 
108 	s->fh = NULL;
109 	if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
110 		test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
111 		/* this stream is still in use internally */
112 		return;
113 	}
114 	if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
115 		IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
116 		return;
117 	}
118 
119 	ivtv_flush_queues(s);
120 
121 	/* disable reinsertion interrupt */
122 	if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
123 		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
124 
125 	/* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
126 	   IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
127 	   for all other streams we're done */
128 	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
129 		s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
130 	else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
131 		s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
132 	else
133 		return;
134 
135 	/* clear internal use flag */
136 	if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
137 		/* was already cleared */
138 		return;
139 	}
140 	if (s_vbi->fh) {
141 		/* VBI stream still claimed by a file descriptor */
142 		return;
143 	}
144 	/* disable reinsertion interrupt */
145 	if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
146 		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
147 	clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
148 	ivtv_flush_queues(s_vbi);
149 }
150 EXPORT_SYMBOL(ivtv_release_stream);
151 
152 static void ivtv_dualwatch(struct ivtv *itv)
153 {
154 	struct v4l2_tuner vt;
155 	u32 new_stereo_mode;
156 	const u32 dual = 0x02;
157 
158 	new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
159 	memset(&vt, 0, sizeof(vt));
160 	ivtv_call_all(itv, tuner, g_tuner, &vt);
161 	if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
162 		new_stereo_mode = dual;
163 
164 	if (new_stereo_mode == itv->dualwatch_stereo_mode)
165 		return;
166 
167 	IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
168 			   itv->dualwatch_stereo_mode, new_stereo_mode);
169 	if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
170 		IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
171 }
172 
173 static void ivtv_update_pgm_info(struct ivtv *itv)
174 {
175 	u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
176 	int cnt;
177 	int i = 0;
178 
179 	if (wr_idx >= itv->pgm_info_num) {
180 		IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
181 		return;
182 	}
183 	cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
184 	while (i < cnt) {
185 		int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
186 		struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
187 		u32 addr = itv->pgm_info_offset + 4 + idx * 24;
188 		const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
189 			V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
190 					// 1=I, 2=P, 4=B
191 
192 		e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
193 		if (e->offset > itv->mpg_data_received) {
194 			break;
195 		}
196 		e->offset += itv->vbi_data_inserted;
197 		e->length = read_enc(addr);
198 		e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
199 		e->flags = mapping[read_enc(addr + 12) & 7];
200 		i++;
201 	}
202 	itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
203 }
204 
205 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
206 {
207 	struct ivtv *itv = s->itv;
208 	struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
209 	struct ivtv_buffer *buf;
210 	DEFINE_WAIT(wait);
211 
212 	*err = 0;
213 	while (1) {
214 		if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
215 			/* Process pending program info updates and pending VBI data */
216 			ivtv_update_pgm_info(itv);
217 
218 			if (time_after(jiffies,
219 				       itv->dualwatch_jiffies +
220 				       msecs_to_jiffies(1000))) {
221 				itv->dualwatch_jiffies = jiffies;
222 				ivtv_dualwatch(itv);
223 			}
224 
225 			if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
226 			    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
227 				while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
228 					/* byteswap and process VBI data */
229 					ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
230 					ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
231 				}
232 			}
233 			buf = &itv->vbi.sliced_mpeg_buf;
234 			if (buf->readpos != buf->bytesused) {
235 				return buf;
236 			}
237 		}
238 
239 		/* do we have leftover data? */
240 		buf = ivtv_dequeue(s, &s->q_io);
241 		if (buf)
242 			return buf;
243 
244 		/* do we have new data? */
245 		buf = ivtv_dequeue(s, &s->q_full);
246 		if (buf) {
247 			if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
248 				return buf;
249 			buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
250 			if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
251 				/* byteswap MPG data */
252 				ivtv_buf_swap(buf);
253 			else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
254 				/* byteswap and process VBI data */
255 				ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
256 			}
257 			return buf;
258 		}
259 
260 		/* return if end of stream */
261 		if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
262 			IVTV_DEBUG_INFO("EOS %s\n", s->name);
263 			return NULL;
264 		}
265 
266 		/* return if file was opened with O_NONBLOCK */
267 		if (non_block) {
268 			*err = -EAGAIN;
269 			return NULL;
270 		}
271 
272 		/* wait for more data to arrive */
273 		mutex_unlock(&itv->serialize_lock);
274 		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
275 		/* New buffers might have become available before we were added to the waitqueue */
276 		if (!s->q_full.buffers)
277 			schedule();
278 		finish_wait(&s->waitq, &wait);
279 		mutex_lock(&itv->serialize_lock);
280 		if (signal_pending(current)) {
281 			/* return if a signal was received */
282 			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
283 			*err = -EINTR;
284 			return NULL;
285 		}
286 	}
287 }
288 
289 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
290 {
291 	int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
292 
293 	itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
294 	itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
295 	itv->vbi.sliced_mpeg_buf.readpos = 0;
296 }
297 
298 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
299 		char __user *ubuf, size_t ucount)
300 {
301 	struct ivtv *itv = s->itv;
302 	size_t len = buf->bytesused - buf->readpos;
303 
304 	if (len > ucount) len = ucount;
305 	if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
306 	    !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
307 		const char *start = buf->buf + buf->readpos;
308 		const char *p = start + 1;
309 		const u8 *q;
310 		u8 ch = itv->search_pack_header ? 0xba : 0xe0;
311 		int stuffing, i;
312 
313 		while (start + len > p && (q = memchr(p, 0, start + len - p))) {
314 			p = q + 1;
315 			if ((char *)q + 15 >= buf->buf + buf->bytesused ||
316 			    q[1] != 0 || q[2] != 1 || q[3] != ch) {
317 				continue;
318 			}
319 			if (!itv->search_pack_header) {
320 				if ((q[6] & 0xc0) != 0x80)
321 					continue;
322 				if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
323 				    ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
324 					ch = 0xba;
325 					itv->search_pack_header = 1;
326 					p = q + 9;
327 				}
328 				continue;
329 			}
330 			stuffing = q[13] & 7;
331 			/* all stuffing bytes must be 0xff */
332 			for (i = 0; i < stuffing; i++)
333 				if (q[14 + i] != 0xff)
334 					break;
335 			if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
336 					q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
337 					q[16 + stuffing] == 1) {
338 				itv->search_pack_header = 0;
339 				len = (char *)q - start;
340 				ivtv_setup_sliced_vbi_buf(itv);
341 				break;
342 			}
343 		}
344 	}
345 	if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
346 		IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
347 		return -EFAULT;
348 	}
349 	/*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
350 			buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
351 			buf == &itv->vbi.sliced_mpeg_buf); */
352 	buf->readpos += len;
353 	if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
354 		itv->mpg_data_received += len;
355 	return len;
356 }
357 
358 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
359 {
360 	struct ivtv *itv = s->itv;
361 	size_t tot_written = 0;
362 	int single_frame = 0;
363 
364 	if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
365 		/* shouldn't happen */
366 		IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
367 		return -EIO;
368 	}
369 
370 	/* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
371 	   arrive one-by-one, so make sure we never output more than one VBI frame at a time */
372 	if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
373 	    (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
374 		single_frame = 1;
375 
376 	for (;;) {
377 		struct ivtv_buffer *buf;
378 		int rc;
379 
380 		buf = ivtv_get_buffer(s, non_block, &rc);
381 		/* if there is no data available... */
382 		if (buf == NULL) {
383 			/* if we got data, then return that regardless */
384 			if (tot_written)
385 				break;
386 			/* EOS condition */
387 			if (rc == 0) {
388 				clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
389 				clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
390 				ivtv_release_stream(s);
391 			}
392 			/* set errno */
393 			return rc;
394 		}
395 		rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
396 		if (buf != &itv->vbi.sliced_mpeg_buf) {
397 			ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
398 		}
399 		else if (buf->readpos == buf->bytesused) {
400 			int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
401 			itv->vbi.sliced_mpeg_size[idx] = 0;
402 			itv->vbi.inserted_frame++;
403 			itv->vbi_data_inserted += buf->bytesused;
404 		}
405 		if (rc < 0)
406 			return rc;
407 		tot_written += rc;
408 
409 		if (tot_written == tot_count || single_frame)
410 			break;
411 	}
412 	return tot_written;
413 }
414 
415 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
416 			loff_t *pos, int non_block)
417 {
418 	ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
419 	struct ivtv *itv = s->itv;
420 
421 	IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
422 	if (rc > 0)
423 		pos += rc;
424 	return rc;
425 }
426 
427 int ivtv_start_capture(struct ivtv_open_id *id)
428 {
429 	struct ivtv *itv = id->itv;
430 	struct ivtv_stream *s = &itv->streams[id->type];
431 	struct ivtv_stream *s_vbi;
432 
433 	if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
434 	    s->type == IVTV_DEC_STREAM_TYPE_MPG ||
435 	    s->type == IVTV_DEC_STREAM_TYPE_YUV ||
436 	    s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
437 		/* you cannot read from these stream types. */
438 		return -EINVAL;
439 	}
440 
441 	/* Try to claim this stream. */
442 	if (ivtv_claim_stream(id, s->type))
443 		return -EBUSY;
444 
445 	/* This stream does not need to start capturing */
446 	if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
447 		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
448 		return 0;
449 	}
450 
451 	/* If capture is already in progress, then we also have to
452 	   do nothing extra. */
453 	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
454 		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
455 		return 0;
456 	}
457 
458 	/* Start VBI capture if required */
459 	s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
460 	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
461 	    test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
462 	    !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
463 		/* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
464 		   automatically when the MPG stream is claimed.
465 		   We only need to start the VBI capturing. */
466 		if (ivtv_start_v4l2_encode_stream(s_vbi)) {
467 			IVTV_DEBUG_WARN("VBI capture start failed\n");
468 
469 			/* Failure, clean up and return an error */
470 			clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
471 			clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
472 			/* also releases the associated VBI stream */
473 			ivtv_release_stream(s);
474 			return -EIO;
475 		}
476 		IVTV_DEBUG_INFO("VBI insertion started\n");
477 	}
478 
479 	/* Tell the card to start capturing */
480 	if (!ivtv_start_v4l2_encode_stream(s)) {
481 		/* We're done */
482 		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
483 		/* Resume a possibly paused encoder */
484 		if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
485 			ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
486 		return 0;
487 	}
488 
489 	/* failure, clean up */
490 	IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
491 
492 	/* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
493 	   automatically when the MPG stream is released.
494 	   We only need to stop the VBI capturing. */
495 	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
496 	    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
497 		ivtv_stop_v4l2_encode_stream(s_vbi, 0);
498 		clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
499 	}
500 	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
501 	ivtv_release_stream(s);
502 	return -EIO;
503 }
504 
505 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
506 {
507 	struct ivtv_open_id *id = fh2id(filp->private_data);
508 	struct ivtv *itv = id->itv;
509 	struct ivtv_stream *s = &itv->streams[id->type];
510 	ssize_t rc;
511 
512 	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
513 
514 	if (mutex_lock_interruptible(&itv->serialize_lock))
515 		return -ERESTARTSYS;
516 	rc = ivtv_start_capture(id);
517 	if (!rc)
518 		rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
519 	mutex_unlock(&itv->serialize_lock);
520 	return rc;
521 }
522 
523 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
524 {
525 	struct ivtv *itv = id->itv;
526 	struct ivtv_stream *s = &itv->streams[id->type];
527 	int rc;
528 
529 	if (atomic_read(&itv->decoding) == 0) {
530 		if (ivtv_claim_stream(id, s->type)) {
531 			/* someone else is using this stream already */
532 			IVTV_DEBUG_WARN("start decode, stream already claimed\n");
533 			return -EBUSY;
534 		}
535 		rc = ivtv_start_v4l2_decode_stream(s, 0);
536 		if (rc < 0) {
537 			if (rc == -EAGAIN)
538 				rc = ivtv_start_v4l2_decode_stream(s, 0);
539 			if (rc < 0)
540 				return rc;
541 		}
542 	}
543 	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
544 		return ivtv_set_speed(itv, speed);
545 	return 0;
546 }
547 
548 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
549 {
550 	struct ivtv_open_id *id = fh2id(filp->private_data);
551 	struct ivtv *itv = id->itv;
552 	struct ivtv_stream *s = &itv->streams[id->type];
553 	struct yuv_playback_info *yi = &itv->yuv_info;
554 	struct ivtv_buffer *buf;
555 	struct ivtv_queue q;
556 	int bytes_written = 0;
557 	int mode;
558 	int rc;
559 	DEFINE_WAIT(wait);
560 
561 	IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
562 
563 	if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
564 	    s->type != IVTV_DEC_STREAM_TYPE_YUV &&
565 	    s->type != IVTV_DEC_STREAM_TYPE_VOUT)
566 		/* not decoder streams */
567 		return -EINVAL;
568 
569 	/* Try to claim this stream */
570 	if (ivtv_claim_stream(id, s->type))
571 		return -EBUSY;
572 
573 	/* This stream does not need to start any decoding */
574 	if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
575 		int elems = count / sizeof(struct v4l2_sliced_vbi_data);
576 
577 		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
578 		return ivtv_write_vbi_from_user(itv,
579 		   (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
580 	}
581 
582 	mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
583 
584 	if (ivtv_set_output_mode(itv, mode) != mode) {
585 	    ivtv_release_stream(s);
586 	    return -EBUSY;
587 	}
588 	ivtv_queue_init(&q);
589 	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
590 
591 	/* Start decoder (returns 0 if already started) */
592 	rc = ivtv_start_decoding(id, itv->speed);
593 	if (rc) {
594 		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
595 
596 		/* failure, clean up */
597 		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
598 		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
599 		return rc;
600 	}
601 
602 retry:
603 	/* If possible, just DMA the entire frame - Check the data transfer size
604 	since we may get here before the stream has been fully set-up */
605 	if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
606 		while (count >= itv->dma_data_req_size) {
607 			rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
608 
609 			if (rc < 0)
610 				return rc;
611 
612 			bytes_written += itv->dma_data_req_size;
613 			user_buf += itv->dma_data_req_size;
614 			count -= itv->dma_data_req_size;
615 		}
616 		if (count == 0) {
617 			IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
618 			return bytes_written;
619 		}
620 	}
621 
622 	for (;;) {
623 		/* Gather buffers */
624 		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
625 			ivtv_enqueue(s, buf, &q);
626 		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
627 			ivtv_enqueue(s, buf, &q);
628 		}
629 		if (q.buffers)
630 			break;
631 		if (filp->f_flags & O_NONBLOCK)
632 			return -EAGAIN;
633 		mutex_unlock(&itv->serialize_lock);
634 		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
635 		/* New buffers might have become free before we were added to the waitqueue */
636 		if (!s->q_free.buffers)
637 			schedule();
638 		finish_wait(&s->waitq, &wait);
639 		mutex_lock(&itv->serialize_lock);
640 		if (signal_pending(current)) {
641 			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
642 			return -EINTR;
643 		}
644 	}
645 
646 	/* copy user data into buffers */
647 	while ((buf = ivtv_dequeue(s, &q))) {
648 		/* yuv is a pain. Don't copy more data than needed for a single
649 		   frame, otherwise we lose sync with the incoming stream */
650 		if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
651 		    yi->stream_size + count > itv->dma_data_req_size)
652 			rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
653 				itv->dma_data_req_size - yi->stream_size);
654 		else
655 			rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
656 
657 		/* Make sure we really got all the user data */
658 		if (rc < 0) {
659 			ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
660 			return rc;
661 		}
662 		user_buf += rc;
663 		count -= rc;
664 		bytes_written += rc;
665 
666 		if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
667 			yi->stream_size += rc;
668 			/* If we have a complete yuv frame, break loop now */
669 			if (yi->stream_size == itv->dma_data_req_size) {
670 				ivtv_enqueue(s, buf, &s->q_full);
671 				yi->stream_size = 0;
672 				break;
673 			}
674 		}
675 
676 		if (buf->bytesused != s->buf_size) {
677 			/* incomplete, leave in q_io for next time */
678 			ivtv_enqueue(s, buf, &s->q_io);
679 			break;
680 		}
681 		/* Byteswap MPEG buffer */
682 		if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
683 			ivtv_buf_swap(buf);
684 		ivtv_enqueue(s, buf, &s->q_full);
685 	}
686 
687 	if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
688 		if (s->q_full.length >= itv->dma_data_req_size) {
689 			int got_sig;
690 
691 			if (mode == OUT_YUV)
692 				ivtv_yuv_setup_stream_frame(itv);
693 
694 			mutex_unlock(&itv->serialize_lock);
695 			prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
696 			while (!(got_sig = signal_pending(current)) &&
697 					test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
698 				schedule();
699 			}
700 			finish_wait(&itv->dma_waitq, &wait);
701 			mutex_lock(&itv->serialize_lock);
702 			if (got_sig) {
703 				IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
704 				return -EINTR;
705 			}
706 
707 			clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
708 			ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
709 			ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
710 		}
711 	}
712 	/* more user data is available, wait until buffers become free
713 	   to transfer the rest. */
714 	if (count && !(filp->f_flags & O_NONBLOCK))
715 		goto retry;
716 	IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
717 	return bytes_written;
718 }
719 
720 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
721 {
722 	struct ivtv_open_id *id = fh2id(filp->private_data);
723 	struct ivtv *itv = id->itv;
724 	ssize_t res;
725 
726 	if (mutex_lock_interruptible(&itv->serialize_lock))
727 		return -ERESTARTSYS;
728 	res = ivtv_write(filp, user_buf, count, pos);
729 	mutex_unlock(&itv->serialize_lock);
730 	return res;
731 }
732 
733 __poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
734 {
735 	struct ivtv_open_id *id = fh2id(filp->private_data);
736 	struct ivtv *itv = id->itv;
737 	struct ivtv_stream *s = &itv->streams[id->type];
738 	__poll_t res = 0;
739 
740 	/* add stream's waitq to the poll list */
741 	IVTV_DEBUG_HI_FILE("Decoder poll\n");
742 
743 	/* If there are subscribed events, then only use the new event
744 	   API instead of the old video.h based API. */
745 	if (!list_empty(&id->fh.subscribed)) {
746 		poll_wait(filp, &id->fh.wait, wait);
747 		/* Turn off the old-style vsync events */
748 		clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
749 		if (v4l2_event_pending(&id->fh))
750 			res = EPOLLPRI;
751 	} else {
752 		/* This is the old-style API which is here only for backwards
753 		   compatibility. */
754 		poll_wait(filp, &s->waitq, wait);
755 		set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
756 		if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
757 		    test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
758 			res = EPOLLPRI;
759 	}
760 
761 	/* Allow write if buffers are available for writing */
762 	if (s->q_free.buffers)
763 		res |= EPOLLOUT | EPOLLWRNORM;
764 	return res;
765 }
766 
767 __poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
768 {
769 	__poll_t req_events = poll_requested_events(wait);
770 	struct ivtv_open_id *id = fh2id(filp->private_data);
771 	struct ivtv *itv = id->itv;
772 	struct ivtv_stream *s = &itv->streams[id->type];
773 	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
774 	__poll_t res = 0;
775 
776 	/* Start a capture if there is none */
777 	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
778 			s->type != IVTV_ENC_STREAM_TYPE_RAD &&
779 			(req_events & (EPOLLIN | EPOLLRDNORM))) {
780 		int rc;
781 
782 		mutex_lock(&itv->serialize_lock);
783 		rc = ivtv_start_capture(id);
784 		mutex_unlock(&itv->serialize_lock);
785 		if (rc) {
786 			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
787 					s->name, rc);
788 			return EPOLLERR;
789 		}
790 		IVTV_DEBUG_FILE("Encoder poll started capture\n");
791 	}
792 
793 	/* add stream's waitq to the poll list */
794 	IVTV_DEBUG_HI_FILE("Encoder poll\n");
795 	poll_wait(filp, &s->waitq, wait);
796 	if (v4l2_event_pending(&id->fh))
797 		res |= EPOLLPRI;
798 	else
799 		poll_wait(filp, &id->fh.wait, wait);
800 
801 	if (s->q_full.length || s->q_io.length)
802 		return res | EPOLLIN | EPOLLRDNORM;
803 	if (eof)
804 		return res | EPOLLHUP;
805 	return res;
806 }
807 
808 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
809 {
810 	struct ivtv *itv = id->itv;
811 	struct ivtv_stream *s = &itv->streams[id->type];
812 
813 	IVTV_DEBUG_FILE("close() of %s\n", s->name);
814 
815 	/* 'Unclaim' this stream */
816 
817 	/* Stop capturing */
818 	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
819 		struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
820 
821 		IVTV_DEBUG_INFO("close stopping capture\n");
822 		/* Special case: a running VBI capture for VBI insertion
823 		   in the mpeg stream. Need to stop that too. */
824 		if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
825 		    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
826 		    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
827 			IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
828 			ivtv_stop_v4l2_encode_stream(s_vbi, 0);
829 		}
830 		if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
831 		     id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
832 		    test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
833 			/* Also used internally, don't stop capturing */
834 			s->fh = NULL;
835 		}
836 		else {
837 			ivtv_stop_v4l2_encode_stream(s, gop_end);
838 		}
839 	}
840 	if (!gop_end) {
841 		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
842 		clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
843 		ivtv_release_stream(s);
844 	}
845 }
846 
847 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
848 {
849 	struct ivtv *itv = id->itv;
850 	struct ivtv_stream *s = &itv->streams[id->type];
851 
852 	IVTV_DEBUG_FILE("close() of %s\n", s->name);
853 
854 	if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
855 		test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
856 		/* Restore registers we've changed & clean up any mess */
857 		ivtv_yuv_close(itv);
858 	}
859 
860 	/* Stop decoding */
861 	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
862 		IVTV_DEBUG_INFO("close stopping decode\n");
863 
864 		ivtv_stop_v4l2_decode_stream(s, flags, pts);
865 		itv->output_mode = OUT_NONE;
866 	}
867 	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
868 	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
869 
870 	if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
871 		itv->output_mode = OUT_NONE;
872 
873 	itv->speed = 0;
874 	clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
875 	ivtv_release_stream(s);
876 }
877 
878 int ivtv_v4l2_close(struct file *filp)
879 {
880 	struct v4l2_fh *fh = filp->private_data;
881 	struct ivtv_open_id *id = fh2id(fh);
882 	struct ivtv *itv = id->itv;
883 	struct ivtv_stream *s = &itv->streams[id->type];
884 
885 	IVTV_DEBUG_FILE("close %s\n", s->name);
886 
887 	mutex_lock(&itv->serialize_lock);
888 
889 	/* Stop radio */
890 	if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
891 			v4l2_fh_is_singular_file(filp)) {
892 		/* Closing radio device, return to TV mode */
893 		ivtv_mute(itv);
894 		/* Mark that the radio is no longer in use */
895 		clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
896 		/* Switch tuner to TV */
897 		ivtv_call_all(itv, video, s_std, itv->std);
898 		/* Select correct audio input (i.e. TV tuner or Line in) */
899 		ivtv_audio_set_io(itv);
900 		if (itv->hw_flags & IVTV_HW_SAA711X) {
901 			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
902 					SAA7115_FREQ_32_11_MHZ, 0);
903 		}
904 		if (atomic_read(&itv->capturing) > 0) {
905 			/* Undo video mute */
906 			ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
907 					v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
908 					(v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
909 		}
910 		/* Done! Unmute and continue. */
911 		ivtv_unmute(itv);
912 	}
913 
914 	v4l2_fh_del(fh);
915 	v4l2_fh_exit(fh);
916 
917 	/* Easy case first: this stream was never claimed by us */
918 	if (s->fh != &id->fh)
919 		goto close_done;
920 
921 	/* 'Unclaim' this stream */
922 
923 	if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
924 		struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
925 
926 		ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0);
927 
928 		/* If all output streams are closed, and if the user doesn't have
929 		   IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
930 		if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
931 			/* disable CC on TV-out */
932 			ivtv_disable_cc(itv);
933 		}
934 	} else {
935 		ivtv_stop_capture(id, 0);
936 	}
937 close_done:
938 	kfree(id);
939 	mutex_unlock(&itv->serialize_lock);
940 	return 0;
941 }
942 
943 static int ivtv_open(struct file *filp)
944 {
945 	struct video_device *vdev = video_devdata(filp);
946 	struct ivtv_stream *s = video_get_drvdata(vdev);
947 	struct ivtv *itv = s->itv;
948 	struct ivtv_open_id *item;
949 	int res = 0;
950 
951 	IVTV_DEBUG_FILE("open %s\n", s->name);
952 
953 	if (ivtv_init_on_first_open(itv)) {
954 		IVTV_ERR("Failed to initialize on device %s\n",
955 			 video_device_node_name(vdev));
956 		return -ENXIO;
957 	}
958 
959 #ifdef CONFIG_VIDEO_ADV_DEBUG
960 	/* Unless ivtv_fw_debug is set, error out if firmware dead. */
961 	if (ivtv_fw_debug) {
962 		IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
963 			  video_device_node_name(vdev));
964 		IVTV_WARN("Selected firmware errors will be ignored\n");
965 	} else {
966 #else
967 	if (1) {
968 #endif
969 		res = ivtv_firmware_check(itv, "ivtv_serialized_open");
970 		if (res == -EAGAIN)
971 			res = ivtv_firmware_check(itv, "ivtv_serialized_open");
972 		if (res < 0)
973 			return -EIO;
974 	}
975 
976 	if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
977 		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
978 		return -EBUSY;
979 
980 	if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
981 		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
982 		return -EBUSY;
983 
984 	if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
985 		if (read_reg(0x82c) == 0) {
986 			IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
987 			/* return -ENODEV; */
988 		}
989 		ivtv_udma_alloc(itv);
990 	}
991 
992 	/* Allocate memory */
993 	item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
994 	if (NULL == item) {
995 		IVTV_DEBUG_WARN("nomem on v4l2 open\n");
996 		return -ENOMEM;
997 	}
998 	v4l2_fh_init(&item->fh, &s->vdev);
999 	item->itv = itv;
1000 	item->type = s->type;
1001 
1002 	filp->private_data = &item->fh;
1003 	v4l2_fh_add(&item->fh);
1004 
1005 	if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
1006 			v4l2_fh_is_singular_file(filp)) {
1007 		if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
1008 			if (atomic_read(&itv->capturing) > 0) {
1009 				/* switching to radio while capture is
1010 				   in progress is not polite */
1011 				v4l2_fh_del(&item->fh);
1012 				v4l2_fh_exit(&item->fh);
1013 				kfree(item);
1014 				return -EBUSY;
1015 			}
1016 		}
1017 		/* Mark that the radio is being used. */
1018 		set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
1019 		/* We have the radio */
1020 		ivtv_mute(itv);
1021 		/* Switch tuner to radio */
1022 		ivtv_call_all(itv, tuner, s_radio);
1023 		/* Select the correct audio input (i.e. radio tuner) */
1024 		ivtv_audio_set_io(itv);
1025 		if (itv->hw_flags & IVTV_HW_SAA711X) {
1026 			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1027 				SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1028 		}
1029 		/* Done! Unmute and continue. */
1030 		ivtv_unmute(itv);
1031 	}
1032 
1033 	/* YUV or MPG Decoding Mode? */
1034 	if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1035 		clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1036 	} else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1037 		set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1038 		/* For yuv, we need to know the dma size before we start */
1039 		itv->dma_data_req_size =
1040 				1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1041 		itv->yuv_info.stream_size = 0;
1042 	}
1043 	return 0;
1044 }
1045 
1046 int ivtv_v4l2_open(struct file *filp)
1047 {
1048 	struct video_device *vdev = video_devdata(filp);
1049 	int res;
1050 
1051 	if (mutex_lock_interruptible(vdev->lock))
1052 		return -ERESTARTSYS;
1053 	res = ivtv_open(filp);
1054 	mutex_unlock(vdev->lock);
1055 	return res;
1056 }
1057 
1058 void ivtv_mute(struct ivtv *itv)
1059 {
1060 	if (atomic_read(&itv->capturing))
1061 		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1062 	IVTV_DEBUG_INFO("Mute\n");
1063 }
1064 
1065 void ivtv_unmute(struct ivtv *itv)
1066 {
1067 	if (atomic_read(&itv->capturing)) {
1068 		ivtv_msleep_timeout(100, 0);
1069 		ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1070 		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1071 	}
1072 	IVTV_DEBUG_INFO("Unmute\n");
1073 }
1074