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OMAP3 SRF: Generic shared resource f/w
[linux-ginger.git] / drivers / media / video / ivtv / ivtv-fileops.c
blobe707ef3086b2b7a3e7025cfce4ff7aaaaa12983d
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 static 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 && !ivtv_raw_vbi(itv)) {
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 u32 new_bitmap;
152 u32 new_stereo_mode;
153 const u32 stereo_mask = 0x0300;
154 const u32 dual = 0x0200;
155
156 new_stereo_mode = itv->params.audio_properties & stereo_mask;
157 memset(&vt, 0, sizeof(vt));
158 ivtv_call_all(itv, tuner, 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 (time_after(jiffies,
223 itv->dualwatch_jiffies +
224 msecs_to_jiffies(1000))) {
225 itv->dualwatch_jiffies = jiffies;
226 ivtv_dualwatch(itv);
227 }
228
229 if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
230 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
231 while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
232 /* byteswap and process VBI data */
233 ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
234 ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
235 }
236 }
237 buf = &itv->vbi.sliced_mpeg_buf;
238 if (buf->readpos != buf->bytesused) {
239 return buf;
240 }
241 }
242
243 /* do we have leftover data? */
244 buf = ivtv_dequeue(s, &s->q_io);
245 if (buf)
246 return buf;
247
248 /* do we have new data? */
249 buf = ivtv_dequeue(s, &s->q_full);
250 if (buf) {
251 if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
252 return buf;
253 buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
254 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
255 /* byteswap MPG data */
256 ivtv_buf_swap(buf);
257 else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
258 /* byteswap and process VBI data */
259 ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
260 }
261 return buf;
262 }
263
264 /* return if end of stream */
265 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
266 IVTV_DEBUG_INFO("EOS %s\n", s->name);
267 return NULL;
268 }
269
270 /* return if file was opened with O_NONBLOCK */
271 if (non_block) {
272 *err = -EAGAIN;
273 return NULL;
274 }
275
276 /* wait for more data to arrive */
277 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
278 /* New buffers might have become available before we were added to the waitqueue */
279 if (!s->q_full.buffers)
280 schedule();
281 finish_wait(&s->waitq, &wait);
282 if (signal_pending(current)) {
283 /* return if a signal was received */
284 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
285 *err = -EINTR;
286 return NULL;
287 }
288 }
289 }
290
291 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
292 {
293 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
294
295 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
296 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
297 itv->vbi.sliced_mpeg_buf.readpos = 0;
298 }
299
300 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
301 char __user *ubuf, size_t ucount)
302 {
303 struct ivtv *itv = s->itv;
304 size_t len = buf->bytesused - buf->readpos;
305
306 if (len > ucount) len = ucount;
307 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
308 !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
309 const char *start = buf->buf + buf->readpos;
310 const char *p = start + 1;
311 const u8 *q;
312 u8 ch = itv->search_pack_header ? 0xba : 0xe0;
313 int stuffing, i;
314
315 while (start + len > p && (q = memchr(p, 0, start + len - p))) {
316 p = q + 1;
317 if ((char *)q + 15 >= buf->buf + buf->bytesused ||
318 q[1] != 0 || q[2] != 1 || q[3] != ch) {
319 continue;
320 }
321 if (!itv->search_pack_header) {
322 if ((q[6] & 0xc0) != 0x80)
323 continue;
324 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
325 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
326 ch = 0xba;
327 itv->search_pack_header = 1;
328 p = q + 9;
329 }
330 continue;
331 }
332 stuffing = q[13] & 7;
333 /* all stuffing bytes must be 0xff */
334 for (i = 0; i < stuffing; i++)
335 if (q[14 + i] != 0xff)
336 break;
337 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
338 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
339 q[16 + stuffing] == 1) {
340 itv->search_pack_header = 0;
341 len = (char *)q - start;
342 ivtv_setup_sliced_vbi_buf(itv);
343 break;
344 }
345 }
346 }
347 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
348 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
349 return -EFAULT;
350 }
351 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
352 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
353 buf == &itv->vbi.sliced_mpeg_buf); */
354 buf->readpos += len;
355 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
356 itv->mpg_data_received += len;
357 return len;
358 }
359
360 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
361 {
362 struct ivtv *itv = s->itv;
363 size_t tot_written = 0;
364 int single_frame = 0;
365
366 if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
367 /* shouldn't happen */
368 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
369 return -EIO;
370 }
371
372 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
373 arrive one-by-one, so make sure we never output more than one VBI frame at a time */
374 if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
375 (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
376 single_frame = 1;
377
378 for (;;) {
379 struct ivtv_buffer *buf;
380 int rc;
381
382 buf = ivtv_get_buffer(s, non_block, &rc);
383 /* if there is no data available... */
384 if (buf == NULL) {
385 /* if we got data, then return that regardless */
386 if (tot_written)
387 break;
388 /* EOS condition */
389 if (rc == 0) {
390 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
391 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
392 ivtv_release_stream(s);
393 }
394 /* set errno */
395 return rc;
396 }
397 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
398 if (buf != &itv->vbi.sliced_mpeg_buf) {
399 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
400 }
401 else if (buf->readpos == buf->bytesused) {
402 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
403 itv->vbi.sliced_mpeg_size[idx] = 0;
404 itv->vbi.inserted_frame++;
405 itv->vbi_data_inserted += buf->bytesused;
406 }
407 if (rc < 0)
408 return rc;
409 tot_written += rc;
410
411 if (tot_written == tot_count || single_frame)
412 break;
413 }
414 return tot_written;
415 }
416
417 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
418 loff_t *pos, int non_block)
419 {
420 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
421 struct ivtv *itv = s->itv;
422
423 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
424 if (rc > 0)
425 pos += rc;
426 return rc;
427 }
428
429 int ivtv_start_capture(struct ivtv_open_id *id)
430 {
431 struct ivtv *itv = id->itv;
432 struct ivtv_stream *s = &itv->streams[id->type];
433 struct ivtv_stream *s_vbi;
434
435 if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
436 s->type == IVTV_DEC_STREAM_TYPE_MPG ||
437 s->type == IVTV_DEC_STREAM_TYPE_YUV ||
438 s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
439 /* you cannot read from these stream types. */
440 return -EPERM;
441 }
442
443 /* Try to claim this stream. */
444 if (ivtv_claim_stream(id, s->type))
445 return -EBUSY;
446
447 /* This stream does not need to start capturing */
448 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
449 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
450 return 0;
451 }
452
453 /* If capture is already in progress, then we also have to
454 do nothing extra. */
455 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
456 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
457 return 0;
458 }
459
460 /* Start VBI capture if required */
461 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
462 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
463 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
464 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
465 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
466 automatically when the MPG stream is claimed.
467 We only need to start the VBI capturing. */
468 if (ivtv_start_v4l2_encode_stream(s_vbi)) {
469 IVTV_DEBUG_WARN("VBI capture start failed\n");
470
471 /* Failure, clean up and return an error */
472 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
473 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
474 /* also releases the associated VBI stream */
475 ivtv_release_stream(s);
476 return -EIO;
477 }
478 IVTV_DEBUG_INFO("VBI insertion started\n");
479 }
480
481 /* Tell the card to start capturing */
482 if (!ivtv_start_v4l2_encode_stream(s)) {
483 /* We're done */
484 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
485 /* Resume a possibly paused encoder */
486 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
487 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
488 return 0;
489 }
490
491 /* failure, clean up */
492 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
493
494 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
495 automatically when the MPG stream is released.
496 We only need to stop the VBI capturing. */
497 if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
498 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
499 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
500 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
501 }
502 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
503 ivtv_release_stream(s);
504 return -EIO;
505 }
506
507 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
508 {
509 struct ivtv_open_id *id = filp->private_data;
510 struct ivtv *itv = id->itv;
511 struct ivtv_stream *s = &itv->streams[id->type];
512 int rc;
513
514 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
515
516 mutex_lock(&itv->serialize_lock);
517 rc = ivtv_start_capture(id);
518 mutex_unlock(&itv->serialize_lock);
519 if (rc)
520 return rc;
521 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
522 }
523
524 int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
525 {
526 struct ivtv *itv = id->itv;
527 struct ivtv_stream *s = &itv->streams[id->type];
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 ivtv_start_v4l2_decode_stream(s, 0);
536 }
537 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
538 return ivtv_set_speed(itv, speed);
539 return 0;
540 }
541
542 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
543 {
544 struct ivtv_open_id *id = filp->private_data;
545 struct ivtv *itv = id->itv;
546 struct ivtv_stream *s = &itv->streams[id->type];
547 struct yuv_playback_info *yi = &itv->yuv_info;
548 struct ivtv_buffer *buf;
549 struct ivtv_queue q;
550 int bytes_written = 0;
551 int mode;
552 int rc;
553 DEFINE_WAIT(wait);
554
555 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
556
557 if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
558 s->type != IVTV_DEC_STREAM_TYPE_YUV &&
559 s->type != IVTV_DEC_STREAM_TYPE_VOUT)
560 /* not decoder streams */
561 return -EPERM;
562
563 /* Try to claim this stream */
564 if (ivtv_claim_stream(id, s->type))
565 return -EBUSY;
566
567 /* This stream does not need to start any decoding */
568 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
569 int elems = count / sizeof(struct v4l2_sliced_vbi_data);
570
571 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
572 ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
573 return elems * sizeof(struct v4l2_sliced_vbi_data);
574 }
575
576 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
577
578 if (ivtv_set_output_mode(itv, mode) != mode) {
579 ivtv_release_stream(s);
580 return -EBUSY;
581 }
582 ivtv_queue_init(&q);
583 set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
584
585 /* Start decoder (returns 0 if already started) */
586 mutex_lock(&itv->serialize_lock);
587 rc = ivtv_start_decoding(id, itv->speed);
588 mutex_unlock(&itv->serialize_lock);
589 if (rc) {
590 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
591
592 /* failure, clean up */
593 clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
594 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
595 return rc;
596 }
597
598 retry:
599 /* If possible, just DMA the entire frame - Check the data transfer size
600 since we may get here before the stream has been fully set-up */
601 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
602 while (count >= itv->dma_data_req_size) {
603 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
604
605 if (rc < 0)
606 return rc;
607
608 bytes_written += itv->dma_data_req_size;
609 user_buf += itv->dma_data_req_size;
610 count -= itv->dma_data_req_size;
611 }
612 if (count == 0) {
613 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
614 return bytes_written;
615 }
616 }
617
618 for (;;) {
619 /* Gather buffers */
620 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
621 ivtv_enqueue(s, buf, &q);
622 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
623 ivtv_enqueue(s, buf, &q);
624 }
625 if (q.buffers)
626 break;
627 if (filp->f_flags & O_NONBLOCK)
628 return -EAGAIN;
629 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
630 /* New buffers might have become free before we were added to the waitqueue */
631 if (!s->q_free.buffers)
632 schedule();
633 finish_wait(&s->waitq, &wait);
634 if (signal_pending(current)) {
635 IVTV_DEBUG_INFO("User stopped %s\n", s->name);
636 return -EINTR;
637 }
638 }
639
640 /* copy user data into buffers */
641 while ((buf = ivtv_dequeue(s, &q))) {
642 /* yuv is a pain. Don't copy more data than needed for a single
643 frame, otherwise we lose sync with the incoming stream */
644 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
645 yi->stream_size + count > itv->dma_data_req_size)
646 rc = ivtv_buf_copy_from_user(s, buf, user_buf,
647 itv->dma_data_req_size - yi->stream_size);
648 else
649 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
650
651 /* Make sure we really got all the user data */
652 if (rc < 0) {
653 ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
654 return rc;
655 }
656 user_buf += rc;
657 count -= rc;
658 bytes_written += rc;
659
660 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
661 yi->stream_size += rc;
662 /* If we have a complete yuv frame, break loop now */
663 if (yi->stream_size == itv->dma_data_req_size) {
664 ivtv_enqueue(s, buf, &s->q_full);
665 yi->stream_size = 0;
666 break;
667 }
668 }
669
670 if (buf->bytesused != s->buf_size) {
671 /* incomplete, leave in q_io for next time */
672 ivtv_enqueue(s, buf, &s->q_io);
673 break;
674 }
675 /* Byteswap MPEG buffer */
676 if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
677 ivtv_buf_swap(buf);
678 ivtv_enqueue(s, buf, &s->q_full);
679 }
680
681 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
682 if (s->q_full.length >= itv->dma_data_req_size) {
683 int got_sig;
684
685 if (mode == OUT_YUV)
686 ivtv_yuv_setup_stream_frame(itv);
687
688 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
689 while (!(got_sig = signal_pending(current)) &&
690 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
691 schedule();
692 }
693 finish_wait(&itv->dma_waitq, &wait);
694 if (got_sig) {
695 IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
696 return -EINTR;
697 }
698
699 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
700 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
701 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
702 }
703 }
704 /* more user data is available, wait until buffers become free
705 to transfer the rest. */
706 if (count && !(filp->f_flags & O_NONBLOCK))
707 goto retry;
708 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
709 return bytes_written;
710 }
711
712 unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
713 {
714 struct ivtv_open_id *id = filp->private_data;
715 struct ivtv *itv = id->itv;
716 struct ivtv_stream *s = &itv->streams[id->type];
717 int res = 0;
718
719 /* add stream's waitq to the poll list */
720 IVTV_DEBUG_HI_FILE("Decoder poll\n");
721 poll_wait(filp, &s->waitq, wait);
722
723 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
724 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
725 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
726 res = POLLPRI;
727
728 /* Allow write if buffers are available for writing */
729 if (s->q_free.buffers)
730 res |= POLLOUT | POLLWRNORM;
731 return res;
732 }
733
734 unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
735 {
736 struct ivtv_open_id *id = filp->private_data;
737 struct ivtv *itv = id->itv;
738 struct ivtv_stream *s = &itv->streams[id->type];
739 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
740
741 /* Start a capture if there is none */
742 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
743 int rc;
744
745 mutex_lock(&itv->serialize_lock);
746 rc = ivtv_start_capture(id);
747 mutex_unlock(&itv->serialize_lock);
748 if (rc) {
749 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
750 s->name, rc);
751 return POLLERR;
752 }
753 IVTV_DEBUG_FILE("Encoder poll started capture\n");
754 }
755
756 /* add stream's waitq to the poll list */
757 IVTV_DEBUG_HI_FILE("Encoder poll\n");
758 poll_wait(filp, &s->waitq, wait);
759
760 if (s->q_full.length || s->q_io.length)
761 return POLLIN | POLLRDNORM;
762 if (eof)
763 return POLLHUP;
764 return 0;
765 }
766
767 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
768 {
769 struct ivtv *itv = id->itv;
770 struct ivtv_stream *s = &itv->streams[id->type];
771
772 IVTV_DEBUG_FILE("close() of %s\n", s->name);
773
774 /* 'Unclaim' this stream */
775
776 /* Stop capturing */
777 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
778 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
779
780 IVTV_DEBUG_INFO("close stopping capture\n");
781 /* Special case: a running VBI capture for VBI insertion
782 in the mpeg stream. Need to stop that too. */
783 if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
784 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
785 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
786 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
787 ivtv_stop_v4l2_encode_stream(s_vbi, 0);
788 }
789 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
790 id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
791 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
792 /* Also used internally, don't stop capturing */
793 s->id = -1;
794 }
795 else {
796 ivtv_stop_v4l2_encode_stream(s, gop_end);
797 }
798 }
799 if (!gop_end) {
800 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
801 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
802 ivtv_release_stream(s);
803 }
804 }
805
806 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
807 {
808 struct ivtv *itv = id->itv;
809 struct ivtv_stream *s = &itv->streams[id->type];
810
811 IVTV_DEBUG_FILE("close() of %s\n", s->name);
812
813 /* Stop decoding */
814 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
815 IVTV_DEBUG_INFO("close stopping decode\n");
816
817 ivtv_stop_v4l2_decode_stream(s, flags, pts);
818 itv->output_mode = OUT_NONE;
819 }
820 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
821 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
822 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
823 /* Restore registers we've changed & clean up any mess we've made */
824 ivtv_yuv_close(itv);
825 }
826 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
827 itv->output_mode = OUT_NONE;
828
829 itv->speed = 0;
830 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
831 ivtv_release_stream(s);
832 }
833
834 int ivtv_v4l2_close(struct file *filp)
835 {
836 struct ivtv_open_id *id = filp->private_data;
837 struct ivtv *itv = id->itv;
838 struct ivtv_stream *s = &itv->streams[id->type];
839
840 IVTV_DEBUG_FILE("close %s\n", s->name);
841
842 v4l2_prio_close(&itv->prio, &id->prio);
843
844 /* Easy case first: this stream was never claimed by us */
845 if (s->id != id->open_id) {
846 kfree(id);
847 return 0;
848 }
849
850 /* 'Unclaim' this stream */
851
852 /* Stop radio */
853 mutex_lock(&itv->serialize_lock);
854 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
855 /* Closing radio device, return to TV mode */
856 ivtv_mute(itv);
857 /* Mark that the radio is no longer in use */
858 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
859 /* Switch tuner to TV */
860 ivtv_call_all(itv, core, s_std, itv->std);
861 /* Select correct audio input (i.e. TV tuner or Line in) */
862 ivtv_audio_set_io(itv);
863 if (itv->hw_flags & IVTV_HW_SAA711X) {
864 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
865 SAA7115_FREQ_32_11_MHZ, 0);
866 }
867 if (atomic_read(&itv->capturing) > 0) {
868 /* Undo video mute */
869 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
870 itv->params.video_mute | (itv->params.video_mute_yuv << 8));
871 }
872 /* Done! Unmute and continue. */
873 ivtv_unmute(itv);
874 ivtv_release_stream(s);
875 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
876 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
877
878 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
879
880 /* If all output streams are closed, and if the user doesn't have
881 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
882 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
883 /* disable CC on TV-out */
884 ivtv_disable_cc(itv);
885 }
886 } else {
887 ivtv_stop_capture(id, 0);
888 }
889 kfree(id);
890 mutex_unlock(&itv->serialize_lock);
891 return 0;
892 }
893
894 static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
895 {
896 struct ivtv *itv = s->itv;
897 struct ivtv_open_id *item;
898
899 IVTV_DEBUG_FILE("open %s\n", s->name);
900
901 if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
902 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
903 return -EBUSY;
904
905 if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
906 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
907 return -EBUSY;
908
909 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
910 if (read_reg(0x82c) == 0) {
911 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
912 /* return -ENODEV; */
913 }
914 ivtv_udma_alloc(itv);
915 }
916
917 /* Allocate memory */
918 item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
919 if (NULL == item) {
920 IVTV_DEBUG_WARN("nomem on v4l2 open\n");
921 return -ENOMEM;
922 }
923 item->itv = itv;
924 item->type = s->type;
925 v4l2_prio_open(&itv->prio, &item->prio);
926
927 item->open_id = itv->open_id++;
928 filp->private_data = item;
929
930 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
931 /* Try to claim this stream */
932 if (ivtv_claim_stream(item, item->type)) {
933 /* No, it's already in use */
934 kfree(item);
935 return -EBUSY;
936 }
937
938 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
939 if (atomic_read(&itv->capturing) > 0) {
940 /* switching to radio while capture is
941 in progress is not polite */
942 ivtv_release_stream(s);
943 kfree(item);
944 return -EBUSY;
945 }
946 }
947 /* Mark that the radio is being used. */
948 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
949 /* We have the radio */
950 ivtv_mute(itv);
951 /* Switch tuner to radio */
952 ivtv_call_all(itv, tuner, s_radio);
953 /* Select the correct audio input (i.e. radio tuner) */
954 ivtv_audio_set_io(itv);
955 if (itv->hw_flags & IVTV_HW_SAA711X) {
956 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
957 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
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 file *filp)
977 {
978 int res;
979 struct ivtv *itv = NULL;
980 struct ivtv_stream *s = NULL;
981 struct video_device *vdev = video_devdata(filp);
982
983 s = video_get_drvdata(vdev);
984 itv = s->itv;
985
986 mutex_lock(&itv->serialize_lock);
987 if (ivtv_init_on_first_open(itv)) {
988 IVTV_ERR("Failed to initialize on minor %d\n",
989 vdev->minor);
990 mutex_unlock(&itv->serialize_lock);
991 return -ENXIO;
992 }
993 res = ivtv_serialized_open(s, filp);
994 mutex_unlock(&itv->serialize_lock);
995 return res;
996 }
997
998 void ivtv_mute(struct ivtv *itv)
999 {
1000 if (atomic_read(&itv->capturing))
1001 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1002 IVTV_DEBUG_INFO("Mute\n");
1003 }
1004
1005 void ivtv_unmute(struct ivtv *itv)
1006 {
1007 if (atomic_read(&itv->capturing)) {
1008 ivtv_msleep_timeout(100, 0);
1009 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1010 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1011 }
1012 IVTV_DEBUG_INFO("Unmute\n");
1013 }
Linux for Ginger Game Console