1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 file operation functions 4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> 5 Copyright (C) 2004 Chris Kennedy <c@groovy.org> 6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> 7 8 */ 9 10 #include "ivtv-driver.h" 11 #include "ivtv-fileops.h" 12 #include "ivtv-i2c.h" 13 #include "ivtv-queue.h" 14 #include "ivtv-udma.h" 15 #include "ivtv-irq.h" 16 #include "ivtv-vbi.h" 17 #include "ivtv-mailbox.h" 18 #include "ivtv-routing.h" 19 #include "ivtv-streams.h" 20 #include "ivtv-yuv.h" 21 #include "ivtv-ioctl.h" 22 #include "ivtv-cards.h" 23 #include "ivtv-firmware.h" 24 #include <linux/lockdep.h> 25 #include <media/v4l2-event.h> 26 #include <media/i2c/saa7115.h> 27 28 /* This function tries to claim the stream for a specific file descriptor. 29 If no one else is using this stream then the stream is claimed and 30 associated VBI streams are also automatically claimed. 31 Possible error returns: -EBUSY if someone else has claimed 32 the stream or 0 on success. */ 33 int ivtv_claim_stream(struct ivtv_open_id *id, int type) 34 { 35 struct ivtv *itv = id->itv; 36 struct ivtv_stream *s = &itv->streams[type]; 37 struct ivtv_stream *s_vbi; 38 int vbi_type; 39 40 if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) { 41 /* someone already claimed this stream */ 42 if (s->fh == &id->fh) { 43 /* yes, this file descriptor did. So that's OK. */ 44 return 0; 45 } 46 if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI || 47 type == IVTV_ENC_STREAM_TYPE_VBI)) { 48 /* VBI is handled already internally, now also assign 49 the file descriptor to this stream for external 50 reading of the stream. */ 51 s->fh = &id->fh; 52 IVTV_DEBUG_INFO("Start Read VBI\n"); 53 return 0; 54 } 55 /* someone else is using this stream already */ 56 IVTV_DEBUG_INFO("Stream %d is busy\n", type); 57 return -EBUSY; 58 } 59 s->fh = &id->fh; 60 if (type == IVTV_DEC_STREAM_TYPE_VBI) { 61 /* Enable reinsertion interrupt */ 62 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT); 63 } 64 65 /* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI, 66 IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI 67 (provided VBI insertion is on and sliced VBI is selected), for all 68 other streams we're done */ 69 if (type == IVTV_DEC_STREAM_TYPE_MPG) { 70 vbi_type = IVTV_DEC_STREAM_TYPE_VBI; 71 } else if (type == IVTV_ENC_STREAM_TYPE_MPG && 72 itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) { 73 vbi_type = IVTV_ENC_STREAM_TYPE_VBI; 74 } else { 75 return 0; 76 } 77 s_vbi = &itv->streams[vbi_type]; 78 79 if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) { 80 /* Enable reinsertion interrupt */ 81 if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI) 82 ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT); 83 } 84 /* mark that it is used internally */ 85 set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags); 86 return 0; 87 } 88 EXPORT_SYMBOL(ivtv_claim_stream); 89 90 /* This function releases a previously claimed stream. It will take into 91 account associated VBI streams. */ 92 void ivtv_release_stream(struct ivtv_stream *s) 93 { 94 struct ivtv *itv = s->itv; 95 struct ivtv_stream *s_vbi; 96 97 s->fh = NULL; 98 if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) && 99 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) { 100 /* this stream is still in use internally */ 101 return; 102 } 103 if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) { 104 IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name); 105 return; 106 } 107 108 ivtv_flush_queues(s); 109 110 /* disable reinsertion interrupt */ 111 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) 112 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT); 113 114 /* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI, 115 IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI, 116 for all other streams we're done */ 117 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 118 s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI]; 119 else if (s->type == IVTV_ENC_STREAM_TYPE_MPG) 120 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 121 else 122 return; 123 124 /* clear internal use flag */ 125 if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) { 126 /* was already cleared */ 127 return; 128 } 129 if (s_vbi->fh) { 130 /* VBI stream still claimed by a file descriptor */ 131 return; 132 } 133 /* disable reinsertion interrupt */ 134 if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI) 135 ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT); 136 clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags); 137 ivtv_flush_queues(s_vbi); 138 } 139 EXPORT_SYMBOL(ivtv_release_stream); 140 141 static void ivtv_dualwatch(struct ivtv *itv) 142 { 143 struct v4l2_tuner vt; 144 u32 new_stereo_mode; 145 const u32 dual = 0x02; 146 147 new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode); 148 memset(&vt, 0, sizeof(vt)); 149 ivtv_call_all(itv, tuner, g_tuner, &vt); 150 if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2)) 151 new_stereo_mode = dual; 152 153 if (new_stereo_mode == itv->dualwatch_stereo_mode) 154 return; 155 156 IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n", 157 itv->dualwatch_stereo_mode, new_stereo_mode); 158 if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode)) 159 IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n"); 160 } 161 162 static void ivtv_update_pgm_info(struct ivtv *itv) 163 { 164 u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24; 165 int cnt; 166 int i = 0; 167 168 if (wr_idx >= itv->pgm_info_num) { 169 IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num); 170 return; 171 } 172 cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num; 173 while (i < cnt) { 174 int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num; 175 struct v4l2_enc_idx_entry *e = itv->pgm_info + idx; 176 u32 addr = itv->pgm_info_offset + 4 + idx * 24; 177 const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1, 178 V4L2_ENC_IDX_FRAME_B, -1, -1, -1 }; 179 // 1=I, 2=P, 4=B 180 181 e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32); 182 if (e->offset > itv->mpg_data_received) { 183 break; 184 } 185 e->offset += itv->vbi_data_inserted; 186 e->length = read_enc(addr); 187 e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32); 188 e->flags = mapping[read_enc(addr + 12) & 7]; 189 i++; 190 } 191 itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num; 192 } 193 194 static void ivtv_schedule(struct ivtv_stream *s) 195 { 196 struct ivtv *itv = s->itv; 197 DEFINE_WAIT(wait); 198 199 lockdep_assert_held(&itv->serialize_lock); 200 201 mutex_unlock(&itv->serialize_lock); 202 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE); 203 /* New buffers might have become free before we were added to the waitqueue */ 204 if (!s->q_free.buffers) 205 schedule(); 206 finish_wait(&s->waitq, &wait); 207 mutex_lock(&itv->serialize_lock); 208 } 209 210 static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err) 211 { 212 struct ivtv *itv = s->itv; 213 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 214 struct ivtv_buffer *buf; 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 ivtv_schedule(s); 278 if (signal_pending(current)) { 279 /* return if a signal was received */ 280 IVTV_DEBUG_INFO("User stopped %s\n", s->name); 281 *err = -EINTR; 282 return NULL; 283 } 284 } 285 } 286 287 static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv) 288 { 289 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES; 290 291 itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx]; 292 itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx]; 293 itv->vbi.sliced_mpeg_buf.readpos = 0; 294 } 295 296 static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf, 297 char __user *ubuf, size_t ucount) 298 { 299 struct ivtv *itv = s->itv; 300 size_t len = buf->bytesused - buf->readpos; 301 302 if (len > ucount) len = ucount; 303 if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG && 304 !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) { 305 const char *start = buf->buf + buf->readpos; 306 const char *p = start + 1; 307 const u8 *q; 308 u8 ch = itv->search_pack_header ? 0xba : 0xe0; 309 int stuffing, i; 310 311 while (start + len > p && (q = memchr(p, 0, start + len - p))) { 312 p = q + 1; 313 if ((char *)q + 15 >= buf->buf + buf->bytesused || 314 q[1] != 0 || q[2] != 1 || q[3] != ch) { 315 continue; 316 } 317 if (!itv->search_pack_header) { 318 if ((q[6] & 0xc0) != 0x80) 319 continue; 320 if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) || 321 ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) { 322 ch = 0xba; 323 itv->search_pack_header = 1; 324 p = q + 9; 325 } 326 continue; 327 } 328 stuffing = q[13] & 7; 329 /* all stuffing bytes must be 0xff */ 330 for (i = 0; i < stuffing; i++) 331 if (q[14 + i] != 0xff) 332 break; 333 if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 && 334 q[14 + stuffing] == 0 && q[15 + stuffing] == 0 && 335 q[16 + stuffing] == 1) { 336 itv->search_pack_header = 0; 337 len = (char *)q - start; 338 ivtv_setup_sliced_vbi_buf(itv); 339 break; 340 } 341 } 342 } 343 if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) { 344 IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name); 345 return -EFAULT; 346 } 347 /*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount, 348 buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len, 349 buf == &itv->vbi.sliced_mpeg_buf); */ 350 buf->readpos += len; 351 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf) 352 itv->mpg_data_received += len; 353 return len; 354 } 355 356 static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block) 357 { 358 struct ivtv *itv = s->itv; 359 size_t tot_written = 0; 360 int single_frame = 0; 361 362 if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) { 363 /* shouldn't happen */ 364 IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name); 365 return -EIO; 366 } 367 368 /* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should 369 arrive one-by-one, so make sure we never output more than one VBI frame at a time */ 370 if (s->type == IVTV_DEC_STREAM_TYPE_VBI || 371 (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv))) 372 single_frame = 1; 373 374 for (;;) { 375 struct ivtv_buffer *buf; 376 int rc; 377 378 buf = ivtv_get_buffer(s, non_block, &rc); 379 /* if there is no data available... */ 380 if (buf == NULL) { 381 /* if we got data, then return that regardless */ 382 if (tot_written) 383 break; 384 /* EOS condition */ 385 if (rc == 0) { 386 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 387 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 388 ivtv_release_stream(s); 389 } 390 /* set errno */ 391 return rc; 392 } 393 rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written); 394 if (buf != &itv->vbi.sliced_mpeg_buf) { 395 ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io); 396 } 397 else if (buf->readpos == buf->bytesused) { 398 int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES; 399 itv->vbi.sliced_mpeg_size[idx] = 0; 400 itv->vbi.inserted_frame++; 401 itv->vbi_data_inserted += buf->bytesused; 402 } 403 if (rc < 0) 404 return rc; 405 tot_written += rc; 406 407 if (tot_written == tot_count || single_frame) 408 break; 409 } 410 return tot_written; 411 } 412 413 static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count, 414 loff_t *pos, int non_block) 415 { 416 ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0; 417 struct ivtv *itv = s->itv; 418 419 IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc); 420 if (rc > 0) 421 *pos += rc; 422 return rc; 423 } 424 425 int ivtv_start_capture(struct ivtv_open_id *id) 426 { 427 struct ivtv *itv = id->itv; 428 struct ivtv_stream *s = &itv->streams[id->type]; 429 struct ivtv_stream *s_vbi; 430 431 if (s->type == IVTV_ENC_STREAM_TYPE_RAD || 432 s->type == IVTV_DEC_STREAM_TYPE_MPG || 433 s->type == IVTV_DEC_STREAM_TYPE_YUV || 434 s->type == IVTV_DEC_STREAM_TYPE_VOUT) { 435 /* you cannot read from these stream types. */ 436 return -EINVAL; 437 } 438 439 /* Try to claim this stream. */ 440 if (ivtv_claim_stream(id, s->type)) 441 return -EBUSY; 442 443 /* This stream does not need to start capturing */ 444 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) { 445 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 446 return 0; 447 } 448 449 /* If capture is already in progress, then we also have to 450 do nothing extra. */ 451 if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 452 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 453 return 0; 454 } 455 456 /* Start VBI capture if required */ 457 s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 458 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && 459 test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) && 460 !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) { 461 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed 462 automatically when the MPG stream is claimed. 463 We only need to start the VBI capturing. */ 464 if (ivtv_start_v4l2_encode_stream(s_vbi)) { 465 IVTV_DEBUG_WARN("VBI capture start failed\n"); 466 467 /* Failure, clean up and return an error */ 468 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags); 469 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 470 /* also releases the associated VBI stream */ 471 ivtv_release_stream(s); 472 return -EIO; 473 } 474 IVTV_DEBUG_INFO("VBI insertion started\n"); 475 } 476 477 /* Tell the card to start capturing */ 478 if (!ivtv_start_v4l2_encode_stream(s)) { 479 /* We're done */ 480 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 481 /* Resume a possibly paused encoder */ 482 if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags)) 483 ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1); 484 return 0; 485 } 486 487 /* failure, clean up */ 488 IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name); 489 490 /* Note: the IVTV_ENC_STREAM_TYPE_VBI is released 491 automatically when the MPG stream is released. 492 We only need to stop the VBI capturing. */ 493 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && 494 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) { 495 ivtv_stop_v4l2_encode_stream(s_vbi, 0); 496 clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags); 497 } 498 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 499 ivtv_release_stream(s); 500 return -EIO; 501 } 502 503 ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos) 504 { 505 struct ivtv_open_id *id = fh2id(filp->private_data); 506 struct ivtv *itv = id->itv; 507 struct ivtv_stream *s = &itv->streams[id->type]; 508 ssize_t rc; 509 510 IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name); 511 512 if (mutex_lock_interruptible(&itv->serialize_lock)) 513 return -ERESTARTSYS; 514 rc = ivtv_start_capture(id); 515 if (!rc) 516 rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK); 517 mutex_unlock(&itv->serialize_lock); 518 return rc; 519 } 520 521 int ivtv_start_decoding(struct ivtv_open_id *id, int speed) 522 { 523 struct ivtv *itv = id->itv; 524 struct ivtv_stream *s = &itv->streams[id->type]; 525 int rc; 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 rc = ivtv_start_v4l2_decode_stream(s, 0); 534 if (rc < 0) { 535 if (rc == -EAGAIN) 536 rc = ivtv_start_v4l2_decode_stream(s, 0); 537 if (rc < 0) 538 return rc; 539 } 540 } 541 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 542 return ivtv_set_speed(itv, speed); 543 return 0; 544 } 545 546 static int ivtv_schedule_dma(struct ivtv_stream *s) 547 { 548 struct ivtv *itv = s->itv; 549 int got_sig; 550 DEFINE_WAIT(wait); 551 552 lockdep_assert_held(&itv->serialize_lock); 553 554 mutex_unlock(&itv->serialize_lock); 555 prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE); 556 while (!(got_sig = signal_pending(current)) && 557 test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) 558 schedule(); 559 finish_wait(&itv->dma_waitq, &wait); 560 mutex_lock(&itv->serialize_lock); 561 562 return got_sig; 563 } 564 565 static ssize_t ivtv_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos) 566 { 567 struct ivtv_open_id *id = fh2id(filp->private_data); 568 struct ivtv *itv = id->itv; 569 struct ivtv_stream *s = &itv->streams[id->type]; 570 struct yuv_playback_info *yi = &itv->yuv_info; 571 struct ivtv_buffer *buf; 572 struct ivtv_queue q; 573 int bytes_written = 0; 574 int mode; 575 int rc; 576 577 IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name); 578 579 if (s->type != IVTV_DEC_STREAM_TYPE_MPG && 580 s->type != IVTV_DEC_STREAM_TYPE_YUV && 581 s->type != IVTV_DEC_STREAM_TYPE_VOUT) 582 /* not decoder streams */ 583 return -EINVAL; 584 585 /* Try to claim this stream */ 586 if (ivtv_claim_stream(id, s->type)) 587 return -EBUSY; 588 589 /* This stream does not need to start any decoding */ 590 if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) { 591 int elems = count / sizeof(struct v4l2_sliced_vbi_data); 592 593 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 594 return ivtv_write_vbi_from_user(itv, 595 (const struct v4l2_sliced_vbi_data __user *)user_buf, elems); 596 } 597 598 mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV; 599 600 if (ivtv_set_output_mode(itv, mode) != mode) { 601 ivtv_release_stream(s); 602 return -EBUSY; 603 } 604 ivtv_queue_init(&q); 605 set_bit(IVTV_F_S_APPL_IO, &s->s_flags); 606 607 /* Start decoder (returns 0 if already started) */ 608 rc = ivtv_start_decoding(id, itv->speed); 609 if (rc) { 610 IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name); 611 612 /* failure, clean up */ 613 clear_bit(IVTV_F_S_STREAMING, &s->s_flags); 614 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 615 return rc; 616 } 617 618 retry: 619 /* If possible, just DMA the entire frame - Check the data transfer size 620 since we may get here before the stream has been fully set-up */ 621 if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) { 622 while (count >= itv->dma_data_req_size) { 623 rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf); 624 625 if (rc < 0) 626 return rc; 627 628 bytes_written += itv->dma_data_req_size; 629 user_buf += itv->dma_data_req_size; 630 count -= itv->dma_data_req_size; 631 } 632 if (count == 0) { 633 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused); 634 return bytes_written; 635 } 636 } 637 638 for (;;) { 639 /* Gather buffers */ 640 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io))) 641 ivtv_enqueue(s, buf, &q); 642 while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) { 643 ivtv_enqueue(s, buf, &q); 644 } 645 if (q.buffers) 646 break; 647 if (filp->f_flags & O_NONBLOCK) 648 return -EAGAIN; 649 ivtv_schedule(s); 650 if (signal_pending(current)) { 651 IVTV_DEBUG_INFO("User stopped %s\n", s->name); 652 return -EINTR; 653 } 654 } 655 656 /* copy user data into buffers */ 657 while ((buf = ivtv_dequeue(s, &q))) { 658 /* yuv is a pain. Don't copy more data than needed for a single 659 frame, otherwise we lose sync with the incoming stream */ 660 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && 661 yi->stream_size + count > itv->dma_data_req_size) 662 rc = ivtv_buf_copy_from_user(s, buf, user_buf, 663 itv->dma_data_req_size - yi->stream_size); 664 else 665 rc = ivtv_buf_copy_from_user(s, buf, user_buf, count); 666 667 /* Make sure we really got all the user data */ 668 if (rc < 0) { 669 ivtv_queue_move(s, &q, NULL, &s->q_free, 0); 670 return rc; 671 } 672 user_buf += rc; 673 count -= rc; 674 bytes_written += rc; 675 676 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) { 677 yi->stream_size += rc; 678 /* If we have a complete yuv frame, break loop now */ 679 if (yi->stream_size == itv->dma_data_req_size) { 680 ivtv_enqueue(s, buf, &s->q_full); 681 yi->stream_size = 0; 682 break; 683 } 684 } 685 686 if (buf->bytesused != s->buf_size) { 687 /* incomplete, leave in q_io for next time */ 688 ivtv_enqueue(s, buf, &s->q_io); 689 break; 690 } 691 /* Byteswap MPEG buffer */ 692 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) 693 ivtv_buf_swap(buf); 694 ivtv_enqueue(s, buf, &s->q_full); 695 } 696 697 if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) { 698 if (s->q_full.length >= itv->dma_data_req_size) { 699 if (mode == OUT_YUV) 700 ivtv_yuv_setup_stream_frame(itv); 701 702 if (ivtv_schedule_dma(s)) { 703 IVTV_DEBUG_INFO("User interrupted %s\n", s->name); 704 return -EINTR; 705 } 706 707 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags); 708 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size); 709 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1); 710 } 711 } 712 /* more user data is available, wait until buffers become free 713 to transfer the rest. */ 714 if (count && !(filp->f_flags & O_NONBLOCK)) 715 goto retry; 716 IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused); 717 return bytes_written; 718 } 719 720 ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos) 721 { 722 struct ivtv_open_id *id = fh2id(filp->private_data); 723 struct ivtv *itv = id->itv; 724 ssize_t res; 725 726 if (mutex_lock_interruptible(&itv->serialize_lock)) 727 return -ERESTARTSYS; 728 res = ivtv_write(filp, user_buf, count, pos); 729 mutex_unlock(&itv->serialize_lock); 730 return res; 731 } 732 733 __poll_t ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait) 734 { 735 struct ivtv_open_id *id = fh2id(filp->private_data); 736 struct ivtv *itv = id->itv; 737 struct ivtv_stream *s = &itv->streams[id->type]; 738 __poll_t res = 0; 739 740 /* add stream's waitq to the poll list */ 741 IVTV_DEBUG_HI_FILE("Decoder poll\n"); 742 743 /* If there are subscribed events, then only use the new event 744 API instead of the old video.h based API. */ 745 if (!list_empty(&id->fh.subscribed)) { 746 poll_wait(filp, &id->fh.wait, wait); 747 /* Turn off the old-style vsync events */ 748 clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags); 749 if (v4l2_event_pending(&id->fh)) 750 res = EPOLLPRI; 751 } else { 752 /* This is the old-style API which is here only for backwards 753 compatibility. */ 754 poll_wait(filp, &s->waitq, wait); 755 set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags); 756 if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) || 757 test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags)) 758 res = EPOLLPRI; 759 } 760 761 /* Allow write if buffers are available for writing */ 762 if (s->q_free.buffers) 763 res |= EPOLLOUT | EPOLLWRNORM; 764 return res; 765 } 766 767 __poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait) 768 { 769 __poll_t req_events = poll_requested_events(wait); 770 struct ivtv_open_id *id = fh2id(filp->private_data); 771 struct ivtv *itv = id->itv; 772 struct ivtv_stream *s = &itv->streams[id->type]; 773 int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 774 __poll_t res = 0; 775 776 /* Start a capture if there is none */ 777 if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) && 778 s->type != IVTV_ENC_STREAM_TYPE_RAD && 779 (req_events & (EPOLLIN | EPOLLRDNORM))) { 780 int rc; 781 782 mutex_lock(&itv->serialize_lock); 783 rc = ivtv_start_capture(id); 784 mutex_unlock(&itv->serialize_lock); 785 if (rc) { 786 IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n", 787 s->name, rc); 788 return EPOLLERR; 789 } 790 IVTV_DEBUG_FILE("Encoder poll started capture\n"); 791 } 792 793 /* add stream's waitq to the poll list */ 794 IVTV_DEBUG_HI_FILE("Encoder poll\n"); 795 poll_wait(filp, &s->waitq, wait); 796 if (v4l2_event_pending(&id->fh)) 797 res |= EPOLLPRI; 798 else 799 poll_wait(filp, &id->fh.wait, wait); 800 801 if (s->q_full.length || s->q_io.length) 802 return res | EPOLLIN | EPOLLRDNORM; 803 if (eof) 804 return res | EPOLLHUP; 805 return res; 806 } 807 808 void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end) 809 { 810 struct ivtv *itv = id->itv; 811 struct ivtv_stream *s = &itv->streams[id->type]; 812 813 IVTV_DEBUG_FILE("close() of %s\n", s->name); 814 815 /* 'Unclaim' this stream */ 816 817 /* Stop capturing */ 818 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 819 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; 820 821 IVTV_DEBUG_INFO("close stopping capture\n"); 822 /* Special case: a running VBI capture for VBI insertion 823 in the mpeg stream. Need to stop that too. */ 824 if (id->type == IVTV_ENC_STREAM_TYPE_MPG && 825 test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) && 826 !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) { 827 IVTV_DEBUG_INFO("close stopping embedded VBI capture\n"); 828 ivtv_stop_v4l2_encode_stream(s_vbi, 0); 829 } 830 if ((id->type == IVTV_DEC_STREAM_TYPE_VBI || 831 id->type == IVTV_ENC_STREAM_TYPE_VBI) && 832 test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) { 833 /* Also used internally, don't stop capturing */ 834 s->fh = NULL; 835 } 836 else { 837 ivtv_stop_v4l2_encode_stream(s, gop_end); 838 } 839 } 840 if (!gop_end) { 841 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 842 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 843 ivtv_release_stream(s); 844 } 845 } 846 847 static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts) 848 { 849 struct ivtv *itv = id->itv; 850 struct ivtv_stream *s = &itv->streams[id->type]; 851 852 IVTV_DEBUG_FILE("close() of %s\n", s->name); 853 854 if (id->type == IVTV_DEC_STREAM_TYPE_YUV && 855 test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) { 856 /* Restore registers we've changed & clean up any mess */ 857 ivtv_yuv_close(itv); 858 } 859 860 /* Stop decoding */ 861 if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) { 862 IVTV_DEBUG_INFO("close stopping decode\n"); 863 864 ivtv_stop_v4l2_decode_stream(s, flags, pts); 865 itv->output_mode = OUT_NONE; 866 } 867 clear_bit(IVTV_F_S_APPL_IO, &s->s_flags); 868 clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags); 869 870 if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames) 871 itv->output_mode = OUT_NONE; 872 873 itv->speed = 0; 874 clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags); 875 ivtv_release_stream(s); 876 } 877 878 int ivtv_v4l2_close(struct file *filp) 879 { 880 struct v4l2_fh *fh = filp->private_data; 881 struct ivtv_open_id *id = fh2id(fh); 882 struct ivtv *itv = id->itv; 883 struct ivtv_stream *s = &itv->streams[id->type]; 884 885 IVTV_DEBUG_FILE("close %s\n", s->name); 886 887 mutex_lock(&itv->serialize_lock); 888 889 /* Stop radio */ 890 if (id->type == IVTV_ENC_STREAM_TYPE_RAD && 891 v4l2_fh_is_singular_file(filp)) { 892 /* Closing radio device, return to TV mode */ 893 ivtv_mute(itv); 894 /* Mark that the radio is no longer in use */ 895 clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags); 896 /* Switch tuner to TV */ 897 ivtv_call_all(itv, video, s_std, itv->std); 898 /* Select correct audio input (i.e. TV tuner or Line in) */ 899 ivtv_audio_set_io(itv); 900 if (itv->hw_flags & IVTV_HW_SAA711X) { 901 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq, 902 SAA7115_FREQ_32_11_MHZ, 0); 903 } 904 if (atomic_read(&itv->capturing) > 0) { 905 /* Undo video mute */ 906 ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1, 907 v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) | 908 (v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8)); 909 } 910 /* Done! Unmute and continue. */ 911 ivtv_unmute(itv); 912 } 913 914 v4l2_fh_del(fh); 915 v4l2_fh_exit(fh); 916 917 /* Easy case first: this stream was never claimed by us */ 918 if (s->fh != &id->fh) 919 goto close_done; 920 921 /* 'Unclaim' this stream */ 922 923 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) { 924 struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT]; 925 926 ivtv_stop_decoding(id, V4L2_DEC_CMD_STOP_TO_BLACK | V4L2_DEC_CMD_STOP_IMMEDIATELY, 0); 927 928 /* If all output streams are closed, and if the user doesn't have 929 IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */ 930 if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) { 931 /* disable CC on TV-out */ 932 ivtv_disable_cc(itv); 933 } 934 } else { 935 ivtv_stop_capture(id, 0); 936 } 937 close_done: 938 kfree(id); 939 mutex_unlock(&itv->serialize_lock); 940 return 0; 941 } 942 943 static int ivtv_open(struct file *filp) 944 { 945 struct video_device *vdev = video_devdata(filp); 946 struct ivtv_stream *s = video_get_drvdata(vdev); 947 struct ivtv *itv = s->itv; 948 struct ivtv_open_id *item; 949 int res = 0; 950 951 IVTV_DEBUG_FILE("open %s\n", s->name); 952 953 if (ivtv_init_on_first_open(itv)) { 954 IVTV_ERR("Failed to initialize on device %s\n", 955 video_device_node_name(vdev)); 956 return -ENXIO; 957 } 958 959 #ifdef CONFIG_VIDEO_ADV_DEBUG 960 /* Unless ivtv_fw_debug is set, error out if firmware dead. */ 961 if (ivtv_fw_debug) { 962 IVTV_WARN("Opening %s with dead firmware lockout disabled\n", 963 video_device_node_name(vdev)); 964 IVTV_WARN("Selected firmware errors will be ignored\n"); 965 } else { 966 #else 967 if (1) { 968 #endif 969 res = ivtv_firmware_check(itv, "ivtv_serialized_open"); 970 if (res == -EAGAIN) 971 res = ivtv_firmware_check(itv, "ivtv_serialized_open"); 972 if (res < 0) 973 return -EIO; 974 } 975 976 if (s->type == IVTV_DEC_STREAM_TYPE_MPG && 977 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags)) 978 return -EBUSY; 979 980 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && 981 test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags)) 982 return -EBUSY; 983 984 if (s->type == IVTV_DEC_STREAM_TYPE_YUV) { 985 if (read_reg(0x82c) == 0) { 986 IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n"); 987 /* return -ENODEV; */ 988 } 989 ivtv_udma_alloc(itv); 990 } 991 992 /* Allocate memory */ 993 item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL); 994 if (NULL == item) { 995 IVTV_DEBUG_WARN("nomem on v4l2 open\n"); 996 return -ENOMEM; 997 } 998 v4l2_fh_init(&item->fh, &s->vdev); 999 item->itv = itv; 1000 item->type = s->type; 1001 1002 filp->private_data = &item->fh; 1003 v4l2_fh_add(&item->fh); 1004 1005 if (item->type == IVTV_ENC_STREAM_TYPE_RAD && 1006 v4l2_fh_is_singular_file(filp)) { 1007 if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) { 1008 if (atomic_read(&itv->capturing) > 0) { 1009 /* switching to radio while capture is 1010 in progress is not polite */ 1011 v4l2_fh_del(&item->fh); 1012 v4l2_fh_exit(&item->fh); 1013 kfree(item); 1014 return -EBUSY; 1015 } 1016 } 1017 /* Mark that the radio is being used. */ 1018 set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags); 1019 /* We have the radio */ 1020 ivtv_mute(itv); 1021 /* Switch tuner to radio */ 1022 ivtv_call_all(itv, tuner, s_radio); 1023 /* Select the correct audio input (i.e. radio tuner) */ 1024 ivtv_audio_set_io(itv); 1025 if (itv->hw_flags & IVTV_HW_SAA711X) { 1026 ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq, 1027 SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL); 1028 } 1029 /* Done! Unmute and continue. */ 1030 ivtv_unmute(itv); 1031 } 1032 1033 /* YUV or MPG Decoding Mode? */ 1034 if (s->type == IVTV_DEC_STREAM_TYPE_MPG) { 1035 clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags); 1036 } else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) { 1037 set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags); 1038 /* For yuv, we need to know the dma size before we start */ 1039 itv->dma_data_req_size = 1040 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31); 1041 itv->yuv_info.stream_size = 0; 1042 } 1043 return 0; 1044 } 1045 1046 int ivtv_v4l2_open(struct file *filp) 1047 { 1048 struct video_device *vdev = video_devdata(filp); 1049 int res; 1050 1051 if (mutex_lock_interruptible(vdev->lock)) 1052 return -ERESTARTSYS; 1053 res = ivtv_open(filp); 1054 mutex_unlock(vdev->lock); 1055 return res; 1056 } 1057 1058 void ivtv_mute(struct ivtv *itv) 1059 { 1060 if (atomic_read(&itv->capturing)) 1061 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1); 1062 IVTV_DEBUG_INFO("Mute\n"); 1063 } 1064 1065 void ivtv_unmute(struct ivtv *itv) 1066 { 1067 if (atomic_read(&itv->capturing)) { 1068 ivtv_msleep_timeout(100, 0); 1069 ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12); 1070 ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0); 1071 } 1072 IVTV_DEBUG_INFO("Unmute\n"); 1073 } 1074