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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / media / video / ivtv / ivtv-fileops.c
blob6fb96f19a8661dfe369f7303e6ed4e11301d3ad9
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 <media/saa7115.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 int ivtv_claim_stream(struct ivtv_open_id *id, int type)
43 {
44 struct ivtv *itv = id->itv;
45 struct ivtv_stream *s = &itv->streams[type];
46 struct ivtv_stream *s_vbi;
47 int vbi_type;
48
49 if (test_and_set_bit(IVTV_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 == IVTV_DEC_STREAM_TYPE_VBI ||
56 type == IVTV_ENC_STREAM_TYPE_VBI)) {
57 /* VBI is handled already internally, now also assign
58 the file descriptor to this stream for external
59 reading of the stream. */
60 s->id = id->open_id;
61 IVTV_DEBUG_INFO("Start Read VBI\n");
62 return 0;
63 }
64 /* someone else is using this stream already */
65 IVTV_DEBUG_INFO("Stream %d is busy\n", type);
66 return -EBUSY;
67 }
68 s->id = id->open_id;
69 if (type == IVTV_DEC_STREAM_TYPE_VBI) {
70 /* Enable reinsertion interrupt */
71 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
72 }
73
74 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
75 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
76 (provided VBI insertion is on and sliced VBI is selected), for all
77 other streams we're done */
78 if (type == IVTV_DEC_STREAM_TYPE_MPG) {
79 vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
80 } else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
81 itv->vbi.insert_mpeg && itv->vbi.sliced_in->service_set) {
82 vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
83 } else {
84 return 0;
85 }
86 s_vbi = &itv->streams[vbi_type];
87
88 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
89 /* Enable reinsertion interrupt */
90 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
91 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
92 }
93 /* mark that it is used internally */
94 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
95 return 0;
96 }
97
98 /* This function releases a previously claimed stream. It will take into
99 account associated VBI streams. */
100 void ivtv_release_stream(struct ivtv_stream *s)
101 {
102 struct ivtv *itv = s->itv;
103 struct ivtv_stream *s_vbi;
104
105 s->id = -1;
106 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
107 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
108 /* this stream is still in use internally */
109 return;
110 }
111 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
112 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
113 return;
114 }
115
116 ivtv_flush_queues(s);
117
118 /* disable reinsertion interrupt */
119 if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
120 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
121
122 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
123 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
124 for all other streams we're done */
125 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
126 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
127 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
128 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
129 else
130 return;
131
132 /* clear internal use flag */
133 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
134 /* was already cleared */
135 return;
136 }
137 if (s_vbi->id != -1) {
138 /* VBI stream still claimed by a file descriptor */
139 return;
140 }
141 /* disable reinsertion interrupt */
142 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
143 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
144 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
145 ivtv_flush_queues(s_vbi);
146 }
147
148 static void ivtv_dualwatch(struct ivtv *itv)
149 {
150 struct v4l2_tuner vt;
151 u16 new_bitmap;
152 u16 new_stereo_mode;
153 const u16 stereo_mask = 0x0300;
154 const u16 dual = 0x0200;
155
156 new_stereo_mode = itv->params.audio_properties & stereo_mask;
157 memset(&vt, 0, sizeof(vt));
158 ivtv_call_i2c_clients(itv, VIDIOC_G_TUNER, &vt);
159 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
160 new_stereo_mode = dual;
161
162 if (new_stereo_mode == itv->dualwatch_stereo_mode)
163 return;
164
165 new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
166
167 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
168 itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
169
170 if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
171 itv->dualwatch_stereo_mode = new_stereo_mode;
172 return;
173 }
174 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
175 }
176
177 static void ivtv_update_pgm_info(struct ivtv *itv)
178 {
179 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
180 int cnt;
181 int i = 0;
182
183 if (wr_idx >= itv->pgm_info_num) {
184 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
185 return;
186 }
187 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
188 while (i < cnt) {
189 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
190 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
191 u32 addr = itv->pgm_info_offset + 4 + idx * 24;
192 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
193 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
194 // 1=I, 2=P, 4=B
195
196 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
197 if (e->offset > itv->mpg_data_received) {
198 break;
199 }
200 e->offset += itv->vbi_data_inserted;
201 e->length = read_enc(addr);
202 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
203 e->flags = mapping[read_enc(addr + 12) & 7];
204 i++;
205 }
206 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
207 }
208
209 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
210 {
211 struct ivtv *itv = s->itv;
212 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
213 struct ivtv_buffer *buf;
214 DEFINE_WAIT(wait);
215
216 *err = 0;
217 while (1) {
218 if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
219 /* Process pending program info updates and pending VBI data */
220 ivtv_update_pgm_info(itv);
221
222 if (jiffies - itv->dualwatch_jiffies > msecs_to_jiffies(1000)) {
223 itv->dualwatch_jiffies = jiffies;
224 ivtv_dualwatch(itv);
225 }
226
227 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
228 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
229 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
230 /* byteswap and process VBI data */
231 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
232 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
233 }
234 }
235 buf = &itv->vbi.sliced_mpeg_buf;
236 if (buf->readpos != buf->bytesused) {
237 return buf;
238 }
239 }
240
241 /* do we have leftover data? */
242 buf = ivtv_dequeue(s, &s->q_io);
243 if (buf)
244 return buf;
245
246 /* do we have new data? */
247 buf = ivtv_dequeue(s, &s->q_full);
248 if (buf) {
249 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
250 return buf;
251 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
252 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
253 /* byteswap MPG data */
254 ivtv_buf_swap(buf);
255 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
256 /* byteswap and process VBI data */
257 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
258 }
259 return buf;
260 }
261
262 /* return if end of stream */
263 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
264 IVTV_DEBUG_INFO("EOS %s\n", s->name);
265 return NULL;
266 }
267
268 /* return if file was opened with O_NONBLOCK */
269 if (non_block) {
270 *err = -EAGAIN;
271 return NULL;
272 }
273
274 /* wait for more data to arrive */
275 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
276 /* New buffers might have become available before we were added to the waitqueue */
277 if (!s->q_full.buffers)
278 schedule();
279 finish_wait(&s->waitq, &wait);
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 itv->vbi.sliced_in->service_set && 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->id == -1) {
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 && itv->vbi.sliced_in->service_set))
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 -EPERM;
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 = filp->private_data;
508 struct ivtv *itv = id->itv;
509 struct ivtv_stream *s = &itv->streams[id->type];
510 int rc;
511
512 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
513
514 mutex_lock(&itv->serialize_lock);
515 rc = ivtv_start_capture(id);
516 mutex_unlock(&itv->serialize_lock);
517 if (rc)
518 return rc;
519 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
520 }
521
522 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
523 {
524 struct ivtv *itv = id->itv;
525 struct ivtv_stream *s = &itv->streams[id->type];
526
527 if (atomic_read(&itv->decoding) == 0) {
528 if (ivtv_claim_stream(id, s->type)) {
529 /* someone else is using this stream already */
530 IVTV_DEBUG_WARN("start decode, stream already claimed\n");
531 return -EBUSY;
532 }
533 ivtv_start_v4l2_decode_stream(s, 0);
534 }
535 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
536 return ivtv_set_speed(itv, speed);
537 return 0;
538 }
539
540 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
541 {
542 struct ivtv_open_id *id = filp->private_data;
543 struct ivtv *itv = id->itv;
544 struct ivtv_stream *s = &itv->streams[id->type];
545 struct yuv_playback_info *yi = &itv->yuv_info;
546 struct ivtv_buffer *buf;
547 struct ivtv_queue q;
548 int bytes_written = 0;
549 int mode;
550 int rc;
551 DEFINE_WAIT(wait);
552
553 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
554
555 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
556 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
557 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
558 /* not decoder streams */
559 return -EPERM;
560
561 /* Try to claim this stream */
562 if (ivtv_claim_stream(id, s->type))
563 return -EBUSY;
564
565 /* This stream does not need to start any decoding */
566 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
567 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
568
569 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
570 ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
571 return elems * sizeof(struct v4l2_sliced_vbi_data);
572 }
573
574 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
575
576 if (ivtv_set_output_mode(itv, mode) != mode) {
577 ivtv_release_stream(s);
578 return -EBUSY;
579 }
580 ivtv_queue_init(&q);
581 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
582
583 retry:
584 /* If possible, just DMA the entire frame - Check the data transfer size
585 since we may get here before the stream has been fully set-up */
586 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
587 while (count >= itv->dma_data_req_size) {
588 if (!ivtv_yuv_udma_stream_frame (itv, (void *)user_buf)) {
589 bytes_written += itv->dma_data_req_size;
590 user_buf += itv->dma_data_req_size;
591 count -= itv->dma_data_req_size;
592 } else {
593 break;
594 }
595 }
596 if (count == 0) {
597 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
598 return bytes_written;
599 }
600 }
601
602 for (;;) {
603 /* Gather buffers */
604 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
605 ivtv_enqueue(s, buf, &q);
606 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
607 ivtv_enqueue(s, buf, &q);
608 }
609 if (q.buffers)
610 break;
611 if (filp->f_flags & O_NONBLOCK)
612 return -EAGAIN;
613 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
614 /* New buffers might have become free before we were added to the waitqueue */
615 if (!s->q_free.buffers)
616 schedule();
617 finish_wait(&s->waitq, &wait);
618 if (signal_pending(current)) {
619 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
620 return -EINTR;
621 }
622 }
623
624 /* copy user data into buffers */
625 while ((buf = ivtv_dequeue(s, &q))) {
626 /* yuv is a pain. Don't copy more data than needed for a single
627 frame, otherwise we lose sync with the incoming stream */
628 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
629 yi->stream_size + count > itv->dma_data_req_size)
630 rc = ivtv_buf_copy_from_user(s, buf, user_buf,
631 itv->dma_data_req_size - yi->stream_size);
632 else
633 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
634
635 /* Make sure we really got all the user data */
636 if (rc < 0) {
637 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
638 return rc;
639 }
640 user_buf += rc;
641 count -= rc;
642 bytes_written += rc;
643
644 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
645 yi->stream_size += rc;
646 /* If we have a complete yuv frame, break loop now */
647 if (yi->stream_size == itv->dma_data_req_size) {
648 ivtv_enqueue(s, buf, &s->q_full);
649 yi->stream_size = 0;
650 break;
651 }
652 }
653
654 if (buf->bytesused != s->buf_size) {
655 /* incomplete, leave in q_io for next time */
656 ivtv_enqueue(s, buf, &s->q_io);
657 break;
658 }
659 /* Byteswap MPEG buffer */
660 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
661 ivtv_buf_swap(buf);
662 ivtv_enqueue(s, buf, &s->q_full);
663 }
664
665 /* Start decoder (returns 0 if already started) */
666 mutex_lock(&itv->serialize_lock);
667 rc = ivtv_start_decoding(id, itv->speed);
668 mutex_unlock(&itv->serialize_lock);
669 if (rc) {
670 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
671
672 /* failure, clean up */
673 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
674 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
675 return rc;
676 }
677 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
678 if (s->q_full.length >= itv->dma_data_req_size) {
679 int got_sig;
680
681 if (mode == OUT_YUV)
682 ivtv_yuv_setup_stream_frame(itv);
683
684 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
685 while (!(got_sig = signal_pending(current)) &&
686 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
687 schedule();
688 }
689 finish_wait(&itv->dma_waitq, &wait);
690 if (got_sig) {
691 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
692 return -EINTR;
693 }
694
695 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
696 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
697 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
698 }
699 }
700 /* more user data is available, wait until buffers become free
701 to transfer the rest. */
702 if (count && !(filp->f_flags & O_NONBLOCK))
703 goto retry;
704 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
705 return bytes_written;
706 }
707
708 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
709 {
710 struct ivtv_open_id *id = filp->private_data;
711 struct ivtv *itv = id->itv;
712 struct ivtv_stream *s = &itv->streams[id->type];
713 int res = 0;
714
715 /* add stream's waitq to the poll list */
716 IVTV_DEBUG_HI_FILE("Decoder poll\n");
717 poll_wait(filp, &s->waitq, wait);
718
719 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
720 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
721 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
722 res = POLLPRI;
723
724 /* Allow write if buffers are available for writing */
725 if (s->q_free.buffers)
726 res |= POLLOUT | POLLWRNORM;
727 return res;
728 }
729
730 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
731 {
732 struct ivtv_open_id *id = filp->private_data;
733 struct ivtv *itv = id->itv;
734 struct ivtv_stream *s = &itv->streams[id->type];
735 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
736
737 /* Start a capture if there is none */
738 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
739 int rc;
740
741 mutex_lock(&itv->serialize_lock);
742 rc = ivtv_start_capture(id);
743 mutex_unlock(&itv->serialize_lock);
744 if (rc) {
745 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
746 s->name, rc);
747 return POLLERR;
748 }
749 IVTV_DEBUG_FILE("Encoder poll started capture\n");
750 }
751
752 /* add stream's waitq to the poll list */
753 IVTV_DEBUG_HI_FILE("Encoder poll\n");
754 poll_wait(filp, &s->waitq, wait);
755
756 if (eof || s->q_full.length)
757 return POLLIN | POLLRDNORM;
758 return 0;
759 }
760
761 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
762 {
763 struct ivtv *itv = id->itv;
764 struct ivtv_stream *s = &itv->streams[id->type];
765
766 IVTV_DEBUG_FILE("close() of %s\n", s->name);
767
768 /* 'Unclaim' this stream */
769
770 /* Stop capturing */
771 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
772 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
773
774 IVTV_DEBUG_INFO("close stopping capture\n");
775 /* Special case: a running VBI capture for VBI insertion
776 in the mpeg stream. Need to stop that too. */
777 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
778 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
779 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
780 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
781 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
782 }
783 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
784 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
785 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
786 /* Also used internally, don't stop capturing */
787 s->id = -1;
788 }
789 else {
790 ivtv_stop_v4l2_encode_stream(s, gop_end);
791 }
792 }
793 if (!gop_end) {
794 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
795 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
796 ivtv_release_stream(s);
797 }
798 }
799
800 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
801 {
802 struct ivtv *itv = id->itv;
803 struct ivtv_stream *s = &itv->streams[id->type];
804
805 IVTV_DEBUG_FILE("close() of %s\n", s->name);
806
807 /* Stop decoding */
808 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
809 IVTV_DEBUG_INFO("close stopping decode\n");
810
811 ivtv_stop_v4l2_decode_stream(s, flags, pts);
812 itv->output_mode = OUT_NONE;
813 }
814 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
815 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
816 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
817 /* Restore registers we've changed & clean up any mess we've made */
818 ivtv_yuv_close(itv);
819 }
820 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
821 itv->output_mode = OUT_NONE;
822
823 itv->speed = 0;
824 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
825 ivtv_release_stream(s);
826 }
827
828 int ivtv_v4l2_close(struct inode *inode, struct file *filp)
829 {
830 struct ivtv_open_id *id = filp->private_data;
831 struct ivtv *itv = id->itv;
832 struct ivtv_stream *s = &itv->streams[id->type];
833
834 IVTV_DEBUG_FILE("close %s\n", s->name);
835
836 v4l2_prio_close(&itv->prio, &id->prio);
837
838 /* Easy case first: this stream was never claimed by us */
839 if (s->id != id->open_id) {
840 kfree(id);
841 return 0;
842 }
843
844 /* 'Unclaim' this stream */
845
846 /* Stop radio */
847 mutex_lock(&itv->serialize_lock);
848 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
849 /* Closing radio device, return to TV mode */
850 ivtv_mute(itv);
851 /* Mark that the radio is no longer in use */
852 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
853 /* Switch tuner to TV */
854 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std);
855 /* Select correct audio input (i.e. TV tuner or Line in) */
856 ivtv_audio_set_io(itv);
857 if (itv->hw_flags & IVTV_HW_SAA711X)
858 {
859 struct v4l2_crystal_freq crystal_freq;
860 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
861 crystal_freq.flags = 0;
862 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
863 }
864 if (atomic_read(&itv->capturing) > 0) {
865 /* Undo video mute */
866 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
867 itv->params.video_mute | (itv->params.video_mute_yuv << 8));
868 }
869 /* Done! Unmute and continue. */
870 ivtv_unmute(itv);
871 ivtv_release_stream(s);
872 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
873 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
874
875 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
876
877 /* If all output streams are closed, and if the user doesn't have
878 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
879 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
880 /* disable CC on TV-out */
881 ivtv_disable_cc(itv);
882 }
883 } else {
884 ivtv_stop_capture(id, 0);
885 }
886 kfree(id);
887 mutex_unlock(&itv->serialize_lock);
888 return 0;
889 }
890
891 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
892 {
893 struct ivtv *itv = s->itv;
894 struct ivtv_open_id *item;
895
896 IVTV_DEBUG_FILE("open %s\n", s->name);
897
898 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
899 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
900 return -EBUSY;
901
902 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
903 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
904 return -EBUSY;
905
906 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
907 if (read_reg(0x82c) == 0) {
908 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
909 /* return -ENODEV; */
910 }
911 ivtv_udma_alloc(itv);
912 }
913
914 /* Allocate memory */
915 item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
916 if (NULL == item) {
917 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
918 return -ENOMEM;
919 }
920 item->itv = itv;
921 item->type = s->type;
922 v4l2_prio_open(&itv->prio, &item->prio);
923
924 item->open_id = itv->open_id++;
925 filp->private_data = item;
926
927 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
928 /* Try to claim this stream */
929 if (ivtv_claim_stream(item, item->type)) {
930 /* No, it's already in use */
931 kfree(item);
932 return -EBUSY;
933 }
934
935 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
936 if (atomic_read(&itv->capturing) > 0) {
937 /* switching to radio while capture is
938 in progress is not polite */
939 ivtv_release_stream(s);
940 kfree(item);
941 return -EBUSY;
942 }
943 }
944 /* Mark that the radio is being used. */
945 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
946 /* We have the radio */
947 ivtv_mute(itv);
948 /* Switch tuner to radio */
949 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL);
950 /* Select the correct audio input (i.e. radio tuner) */
951 ivtv_audio_set_io(itv);
952 if (itv->hw_flags & IVTV_HW_SAA711X)
953 {
954 struct v4l2_crystal_freq crystal_freq;
955 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
956 crystal_freq.flags = SAA7115_FREQ_FL_APLL;
957 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq);
958 }
959 /* Done! Unmute and continue. */
960 ivtv_unmute(itv);
961 }
962
963 /* YUV or MPG Decoding Mode? */
964 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
965 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
966 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
967 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
968 /* For yuv, we need to know the dma size before we start */
969 itv->dma_data_req_size =
970 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
971 itv->yuv_info.stream_size = 0;
972 }
973 return 0;
974 }
975
976 int ivtv_v4l2_open(struct inode *inode, struct file *filp)
977 {
978 int res, x, y = 0;
979 struct ivtv *itv = NULL;
980 struct ivtv_stream *s = NULL;
981 int minor = iminor(inode);
982
983 /* Find which card this open was on */
984 spin_lock(&ivtv_cards_lock);
985 for (x = 0; itv == NULL && x < ivtv_cards_active; x++) {
986 /* find out which stream this open was on */
987 for (y = 0; y < IVTV_MAX_STREAMS; y++) {
988 s = &ivtv_cards[x]->streams[y];
989 if (s->v4l2dev && s->v4l2dev->minor == minor) {
990 itv = ivtv_cards[x];
991 break;
992 }
993 }
994 }
995 spin_unlock(&ivtv_cards_lock);
996
997 if (itv == NULL) {
998 /* Couldn't find a device registered
999 on that minor, shouldn't happen! */
1000 printk(KERN_WARNING "No ivtv device found on minor %d\n", minor);
1001 return -ENXIO;
1002 }
1003
1004 mutex_lock(&itv->serialize_lock);
1005 if (ivtv_init_on_first_open(itv)) {
1006 IVTV_ERR("Failed to initialize on minor %d\n", minor);
1007 mutex_unlock(&itv->serialize_lock);
1008 return -ENXIO;
1009 }
1010 res = ivtv_serialized_open(s, filp);
1011 mutex_unlock(&itv->serialize_lock);
1012 return res;
1013 }
1014
1015 void ivtv_mute(struct ivtv *itv)
1016 {
1017 if (atomic_read(&itv->capturing))
1018 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1019 IVTV_DEBUG_INFO("Mute\n");
1020 }
1021
1022 void ivtv_unmute(struct ivtv *itv)
1023 {
1024 if (atomic_read(&itv->capturing)) {
1025 ivtv_msleep_timeout(100, 0);
1026 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1027 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1028 }
1029 IVTV_DEBUG_INFO("Unmute\n");
1030 }
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