ivtv-fileops.c revision 612570f2c4794bbf4e5bfa8648b61fbfc9cd8501
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-audio.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. */ 42int 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. */ 100void 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 148static 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 177static 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 209static 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 /* return if file was opened with O_NONBLOCK */ 262 if (non_block) { 263 *err = -EAGAIN; 264 return NULL; 265 } 266 267 /* return if end of stream */ 268 if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 269 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 270 IVTV_DEBUG_INFO("EOS %s\n", s->name); 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 289static 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 298static 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 358static 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 (buf == NULL && rc == -EAGAIN && tot_written) 382 break; 383 if (buf == NULL) 384 return rc; 385 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written); 386 if (buf != &itv->vbi.sliced_mpeg_buf) { 387 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io); 388 } 389 else if (buf->readpos == buf->bytesused) { 390 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES; 391 itv->vbi.sliced_mpeg_size[idx] = 0; 392 itv->vbi.inserted_frame++; 393 itv->vbi_data_inserted += buf->bytesused; 394 } 395 if (rc < 0) 396 return rc; 397 tot_written += rc; 398 399 if (tot_written == tot_count || single_frame) 400 break; 401 } 402 return tot_written; 403} 404 405static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count, 406 loff_t *pos, int non_block) 407{ 408 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0; 409 struct ivtv *itv = s->itv; 410 411 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc); 412 if (rc > 0) 413 pos += rc; 414 return rc; 415} 416 417int ivtv_start_capture(struct ivtv_open_id *id) 418{ 419 struct ivtv *itv = id->itv; 420 struct ivtv_stream *s = &itv->streams[id->type]; 421 struct ivtv_stream *s_vbi; 422 423 if (s->type == IVTV_ENC_STREAM_TYPE_RAD || 424 s->type == IVTV_DEC_STREAM_TYPE_MPG || 425 s->type == IVTV_DEC_STREAM_TYPE_YUV || 426 s->type == IVTV_DEC_STREAM_TYPE_VOUT) { 427 /* you cannot read from these stream types. */ 428 return -EPERM; 429 } 430 431 /* Try to claim this stream. */ 432 if (ivtv_claim_stream(id, s->type)) 433 return -EBUSY; 434 435 /* This stream does not need to start capturing */ 436 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) { 437 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 438 return 0; 439 } 440 441 /* If capture is already in progress, then we also have to 442 do nothing extra. */ 443 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 444 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 445 return 0; 446 } 447 448 /* Start VBI capture if required */ 449 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 450 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && 451 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) && 452 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) { 453 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed 454 automatically when the MPG stream is claimed. 455 We only need to start the VBI capturing. */ 456 if (ivtv_start_v4l2_encode_stream(s_vbi)) { 457 IVTV_DEBUG_WARN("VBI capture start failed\n"); 458 459 /* Failure, clean up and return an error */ 460 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags); 461 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 462 /* also releases the associated VBI stream */ 463 ivtv_release_stream(s); 464 return -EIO; 465 } 466 IVTV_DEBUG_INFO("VBI insertion started\n"); 467 } 468 469 /* Tell the card to start capturing */ 470 if (!ivtv_start_v4l2_encode_stream(s)) { 471 /* We're done */ 472 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 473 /* Resume a possibly paused encoder */ 474 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags)) 475 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1); 476 return 0; 477 } 478 479 /* failure, clean up */ 480 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name); 481 482 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released 483 automatically when the MPG stream is released. 484 We only need to stop the VBI capturing. */ 485 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && 486 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) { 487 ivtv_stop_v4l2_encode_stream(s_vbi, 0); 488 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags); 489 } 490 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 491 ivtv_release_stream(s); 492 return -EIO; 493} 494 495ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos) 496{ 497 struct ivtv_open_id *id = filp->private_data; 498 struct ivtv *itv = id->itv; 499 struct ivtv_stream *s = &itv->streams[id->type]; 500 int rc; 501 502 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name); 503 504 mutex_lock(&itv->serialize_lock); 505 rc = ivtv_start_capture(id); 506 mutex_unlock(&itv->serialize_lock); 507 if (rc) 508 return rc; 509 return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK); 510} 511 512int ivtv_start_decoding(struct ivtv_open_id *id, int speed) 513{ 514 struct ivtv *itv = id->itv; 515 struct ivtv_stream *s = &itv->streams[id->type]; 516 517 if (atomic_read(&itv->decoding) == 0) { 518 if (ivtv_claim_stream(id, s->type)) { 519 /* someone else is using this stream already */ 520 IVTV_DEBUG_WARN("start decode, stream already claimed\n"); 521 return -EBUSY; 522 } 523 ivtv_start_v4l2_decode_stream(s, 0); 524 } 525 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 526 return ivtv_set_speed(itv, speed); 527 return 0; 528} 529 530ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos) 531{ 532 struct ivtv_open_id *id = filp->private_data; 533 struct ivtv *itv = id->itv; 534 struct ivtv_stream *s = &itv->streams[id->type]; 535 struct ivtv_buffer *buf; 536 struct ivtv_queue q; 537 int bytes_written = 0; 538 int mode; 539 int rc; 540 DEFINE_WAIT(wait); 541 542 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name); 543 544 if (s->type != IVTV_DEC_STREAM_TYPE_MPG && 545 s->type != IVTV_DEC_STREAM_TYPE_YUV && 546 s->type != IVTV_DEC_STREAM_TYPE_VOUT) 547 /* not decoder streams */ 548 return -EPERM; 549 550 /* Try to claim this stream */ 551 if (ivtv_claim_stream(id, s->type)) 552 return -EBUSY; 553 554 /* This stream does not need to start any decoding */ 555 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) { 556 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 557 return ivtv_write_vbi(itv, user_buf, count); 558 } 559 560 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV; 561 562 if (ivtv_set_output_mode(itv, mode) != mode) { 563 ivtv_release_stream(s); 564 return -EBUSY; 565 } 566 ivtv_queue_init(&q); 567 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 568 569retry: 570 for (;;) { 571 /* Gather buffers */ 572 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io))) 573 ivtv_enqueue(s, buf, &q); 574 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) { 575 ivtv_enqueue(s, buf, &q); 576 } 577 if (q.buffers) 578 break; 579 if (filp->f_flags & O_NONBLOCK) 580 return -EAGAIN; 581 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE); 582 /* New buffers might have become free before we were added to the waitqueue */ 583 if (!s->q_free.buffers) 584 schedule(); 585 finish_wait(&s->waitq, &wait); 586 if (signal_pending(current)) { 587 IVTV_DEBUG_INFO("User stopped %s\n", s->name); 588 return -EINTR; 589 } 590 } 591 592 /* copy user data into buffers */ 593 while ((buf = ivtv_dequeue(s, &q))) { 594 /* Make sure we really got all the user data */ 595 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count); 596 597 if (rc < 0) { 598 ivtv_queue_move(s, &q, NULL, &s->q_free, 0); 599 return rc; 600 } 601 user_buf += rc; 602 count -= rc; 603 bytes_written += rc; 604 605 if (buf->bytesused != s->buf_size) { 606 /* incomplete, leave in q_io for next time */ 607 ivtv_enqueue(s, buf, &s->q_io); 608 break; 609 } 610 /* Byteswap MPEG buffer */ 611 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 612 ivtv_buf_swap(buf); 613 ivtv_enqueue(s, buf, &s->q_full); 614 } 615 616 /* Start decoder (returns 0 if already started) */ 617 mutex_lock(&itv->serialize_lock); 618 rc = ivtv_start_decoding(id, itv->speed); 619 mutex_unlock(&itv->serialize_lock); 620 if (rc) { 621 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name); 622 623 /* failure, clean up */ 624 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 625 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 626 return rc; 627 } 628 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) { 629 if (s->q_full.length >= itv->dma_data_req_size) { 630 int got_sig; 631 632 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE); 633 while (!(got_sig = signal_pending(current)) && 634 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) { 635 schedule(); 636 } 637 finish_wait(&itv->dma_waitq, &wait); 638 if (got_sig) { 639 IVTV_DEBUG_INFO("User interrupted %s\n", s->name); 640 return -EINTR; 641 } 642 643 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags); 644 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size); 645 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1); 646 } 647 } 648 /* more user data is available, wait until buffers become free 649 to transfer the rest. */ 650 if (count && !(filp->f_flags & O_NONBLOCK)) 651 goto retry; 652 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused); 653 return bytes_written; 654} 655 656unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait) 657{ 658 struct ivtv_open_id *id = filp->private_data; 659 struct ivtv *itv = id->itv; 660 struct ivtv_stream *s = &itv->streams[id->type]; 661 int res = 0; 662 663 /* add stream's waitq to the poll list */ 664 IVTV_DEBUG_HI_FILE("Decoder poll\n"); 665 poll_wait(filp, &s->waitq, wait); 666 667 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags); 668 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) || 669 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags)) 670 res = POLLPRI; 671 672 /* Allow write if buffers are available for writing */ 673 if (s->q_free.buffers) 674 res |= POLLOUT | POLLWRNORM; 675 return res; 676} 677 678unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait) 679{ 680 struct ivtv_open_id *id = filp->private_data; 681 struct ivtv *itv = id->itv; 682 struct ivtv_stream *s = &itv->streams[id->type]; 683 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 684 685 /* Start a capture if there is none */ 686 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 687 int rc; 688 689 mutex_lock(&itv->serialize_lock); 690 rc = ivtv_start_capture(id); 691 mutex_unlock(&itv->serialize_lock); 692 if (rc) { 693 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n", 694 s->name, rc); 695 return POLLERR; 696 } 697 IVTV_DEBUG_FILE("Encoder poll started capture\n"); 698 } 699 700 /* add stream's waitq to the poll list */ 701 IVTV_DEBUG_HI_FILE("Encoder poll\n"); 702 poll_wait(filp, &s->waitq, wait); 703 704 if (eof || s->q_full.length) 705 return POLLIN | POLLRDNORM; 706 return 0; 707} 708 709void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end) 710{ 711 struct ivtv *itv = id->itv; 712 struct ivtv_stream *s = &itv->streams[id->type]; 713 714 IVTV_DEBUG_FILE("close() of %s\n", s->name); 715 716 /* 'Unclaim' this stream */ 717 718 /* Stop capturing */ 719 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 720 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 721 722 IVTV_DEBUG_INFO("close stopping capture\n"); 723 /* Special case: a running VBI capture for VBI insertion 724 in the mpeg stream. Need to stop that too. */ 725 if (id->type == IVTV_ENC_STREAM_TYPE_MPG && 726 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) && 727 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) { 728 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n"); 729 ivtv_stop_v4l2_encode_stream(s_vbi, 0); 730 } 731 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI || 732 id->type == IVTV_ENC_STREAM_TYPE_VBI) && 733 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) { 734 /* Also used internally, don't stop capturing */ 735 s->id = -1; 736 } 737 else { 738 ivtv_stop_v4l2_encode_stream(s, gop_end); 739 } 740 } 741 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 742 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 743 744 ivtv_release_stream(s); 745} 746 747static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts) 748{ 749 struct ivtv *itv = id->itv; 750 struct ivtv_stream *s = &itv->streams[id->type]; 751 752 IVTV_DEBUG_FILE("close() of %s\n", s->name); 753 754 /* Stop decoding */ 755 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 756 IVTV_DEBUG_INFO("close stopping decode\n"); 757 758 ivtv_stop_v4l2_decode_stream(s, flags, pts); 759 itv->output_mode = OUT_NONE; 760 } 761 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 762 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 763 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) { 764 /* Restore registers we've changed & clean up any mess we've made */ 765 ivtv_yuv_close(itv); 766 } 767 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames) 768 itv->output_mode = OUT_NONE; 769 770 itv->speed = 0; 771 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags); 772 ivtv_release_stream(s); 773} 774 775int ivtv_v4l2_close(struct inode *inode, struct file *filp) 776{ 777 struct ivtv_open_id *id = filp->private_data; 778 struct ivtv *itv = id->itv; 779 struct ivtv_stream *s = &itv->streams[id->type]; 780 781 IVTV_DEBUG_FILE("close %s\n", s->name); 782 783 v4l2_prio_close(&itv->prio, &id->prio); 784 785 /* Easy case first: this stream was never claimed by us */ 786 if (s->id != id->open_id) { 787 kfree(id); 788 return 0; 789 } 790 791 /* 'Unclaim' this stream */ 792 793 /* Stop radio */ 794 mutex_lock(&itv->serialize_lock); 795 if (id->type == IVTV_ENC_STREAM_TYPE_RAD) { 796 /* Closing radio device, return to TV mode */ 797 ivtv_mute(itv); 798 /* Mark that the radio is no longer in use */ 799 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags); 800 /* Switch tuner to TV */ 801 ivtv_call_i2c_clients(itv, VIDIOC_S_STD, &itv->std); 802 /* Select correct audio input (i.e. TV tuner or Line in) */ 803 ivtv_audio_set_io(itv); 804 if (itv->hw_flags & IVTV_HW_SAA711X) 805 { 806 struct v4l2_crystal_freq crystal_freq; 807 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ; 808 crystal_freq.flags = 0; 809 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq); 810 } 811 /* Done! Unmute and continue. */ 812 ivtv_unmute(itv); 813 ivtv_release_stream(s); 814 } else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) { 815 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT]; 816 817 ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0); 818 819 /* If all output streams are closed, and if the user doesn't have 820 IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */ 821 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) { 822 /* disable VBI on TV-out */ 823 ivtv_disable_vbi(itv); 824 } 825 } else { 826 ivtv_stop_capture(id, 0); 827 } 828 kfree(id); 829 mutex_unlock(&itv->serialize_lock); 830 return 0; 831} 832 833static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp) 834{ 835 struct ivtv *itv = s->itv; 836 struct ivtv_open_id *item; 837 838 IVTV_DEBUG_FILE("open %s\n", s->name); 839 840 if (s->type == IVTV_DEC_STREAM_TYPE_MPG && 841 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags)) 842 return -EBUSY; 843 844 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && 845 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags)) 846 return -EBUSY; 847 848 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) { 849 if (read_reg(0x82c) == 0) { 850 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n"); 851 /* return -ENODEV; */ 852 } 853 ivtv_udma_alloc(itv); 854 } 855 856 /* Allocate memory */ 857 item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL); 858 if (NULL == item) { 859 IVTV_DEBUG_WARN("nomem on v4l2 open\n"); 860 return -ENOMEM; 861 } 862 item->itv = itv; 863 item->type = s->type; 864 v4l2_prio_open(&itv->prio, &item->prio); 865 866 item->open_id = itv->open_id++; 867 filp->private_data = item; 868 869 if (item->type == IVTV_ENC_STREAM_TYPE_RAD) { 870 /* Try to claim this stream */ 871 if (ivtv_claim_stream(item, item->type)) { 872 /* No, it's already in use */ 873 kfree(item); 874 return -EBUSY; 875 } 876 877 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) { 878 if (atomic_read(&itv->capturing) > 0) { 879 /* switching to radio while capture is 880 in progress is not polite */ 881 kfree(item); 882 return -EBUSY; 883 } 884 } 885 /* Mark that the radio is being used. */ 886 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags); 887 /* We have the radio */ 888 ivtv_mute(itv); 889 /* Switch tuner to radio */ 890 ivtv_call_i2c_clients(itv, AUDC_SET_RADIO, NULL); 891 /* Select the correct audio input (i.e. radio tuner) */ 892 ivtv_audio_set_io(itv); 893 if (itv->hw_flags & IVTV_HW_SAA711X) 894 { 895 struct v4l2_crystal_freq crystal_freq; 896 crystal_freq.freq = SAA7115_FREQ_32_11_MHZ; 897 crystal_freq.flags = SAA7115_FREQ_FL_APLL; 898 ivtv_saa7115(itv, VIDIOC_INT_S_CRYSTAL_FREQ, &crystal_freq); 899 } 900 /* Done! Unmute and continue. */ 901 ivtv_unmute(itv); 902 } 903 904 /* YUV or MPG Decoding Mode? */ 905 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 906 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags); 907 else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) 908 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags); 909 return 0; 910} 911 912int ivtv_v4l2_open(struct inode *inode, struct file *filp) 913{ 914 int res, x, y = 0; 915 struct ivtv *itv = NULL; 916 struct ivtv_stream *s = NULL; 917 int minor = iminor(inode); 918 919 /* Find which card this open was on */ 920 spin_lock(&ivtv_cards_lock); 921 for (x = 0; itv == NULL && x < ivtv_cards_active; x++) { 922 /* find out which stream this open was on */ 923 for (y = 0; y < IVTV_MAX_STREAMS; y++) { 924 s = &ivtv_cards[x]->streams[y]; 925 if (s->v4l2dev && s->v4l2dev->minor == minor) { 926 itv = ivtv_cards[x]; 927 break; 928 } 929 } 930 } 931 spin_unlock(&ivtv_cards_lock); 932 933 if (itv == NULL) { 934 /* Couldn't find a device registered 935 on that minor, shouldn't happen! */ 936 IVTV_WARN("No ivtv device found on minor %d\n", minor); 937 return -ENXIO; 938 } 939 940 mutex_lock(&itv->serialize_lock); 941 if (ivtv_init_on_first_open(itv)) { 942 IVTV_ERR("Failed to initialize on minor %d\n", minor); 943 mutex_unlock(&itv->serialize_lock); 944 return -ENXIO; 945 } 946 res = ivtv_serialized_open(s, filp); 947 mutex_unlock(&itv->serialize_lock); 948 return res; 949} 950 951void ivtv_mute(struct ivtv *itv) 952{ 953 if (atomic_read(&itv->capturing)) 954 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1); 955 IVTV_DEBUG_INFO("Mute\n"); 956} 957 958void ivtv_unmute(struct ivtv *itv) 959{ 960 if (atomic_read(&itv->capturing)) { 961 ivtv_msleep_timeout(100, 0); 962 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12); 963 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0); 964 } 965 IVTV_DEBUG_INFO("Unmute\n"); 966} 967