1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License as published by 4 * the Free Software Foundation; either version 2 of the License, or 5 * (at your option) any later version. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 15 */ 16 17 #include <linux/init.h> 18 #include <linux/slab.h> 19 #include <linux/ratelimit.h> 20 #include <linux/usb.h> 21 #include <linux/usb/audio.h> 22 #include <linux/usb/audio-v2.h> 23 24 #include <sound/core.h> 25 #include <sound/pcm.h> 26 #include <sound/pcm_params.h> 27 28 #include "usbaudio.h" 29 #include "card.h" 30 #include "quirks.h" 31 #include "debug.h" 32 #include "endpoint.h" 33 #include "helper.h" 34 #include "pcm.h" 35 #include "clock.h" 36 #include "power.h" 37 38 #define SUBSTREAM_FLAG_DATA_EP_STARTED 0 39 #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1 40 41 /* return the estimated delay based on USB frame counters */ 42 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs, 43 unsigned int rate) 44 { 45 int current_frame_number; 46 int frame_diff; 47 int est_delay; 48 49 current_frame_number = usb_get_current_frame_number(subs->dev); 50 /* 51 * HCD implementations use different widths, use lower 8 bits. 52 * The delay will be managed up to 256ms, which is more than 53 * enough 54 */ 55 frame_diff = (current_frame_number - subs->last_frame_number) & 0xff; 56 57 /* Approximation based on number of samples per USB frame (ms), 58 some truncation for 44.1 but the estimate is good enough */ 59 est_delay = subs->last_delay - (frame_diff * rate / 1000); 60 if (est_delay < 0) 61 est_delay = 0; 62 return est_delay; 63 } 64 65 /* 66 * return the current pcm pointer. just based on the hwptr_done value. 67 */ 68 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream) 69 { 70 struct snd_usb_substream *subs; 71 unsigned int hwptr_done; 72 73 subs = (struct snd_usb_substream *)substream->runtime->private_data; 74 if (subs->stream->chip->shutdown) 75 return SNDRV_PCM_POS_XRUN; 76 spin_lock(&subs->lock); 77 hwptr_done = subs->hwptr_done; 78 substream->runtime->delay = snd_usb_pcm_delay(subs, 79 substream->runtime->rate); 80 spin_unlock(&subs->lock); 81 return hwptr_done / (substream->runtime->frame_bits >> 3); 82 } 83 84 /* 85 * find a matching audio format 86 */ 87 static struct audioformat *find_format(struct snd_usb_substream *subs) 88 { 89 struct list_head *p; 90 struct audioformat *found = NULL; 91 int cur_attr = 0, attr; 92 93 list_for_each(p, &subs->fmt_list) { 94 struct audioformat *fp; 95 fp = list_entry(p, struct audioformat, list); 96 if (!(fp->formats & (1uLL << subs->pcm_format))) 97 continue; 98 if (fp->channels != subs->channels) 99 continue; 100 if (subs->cur_rate < fp->rate_min || 101 subs->cur_rate > fp->rate_max) 102 continue; 103 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { 104 unsigned int i; 105 for (i = 0; i < fp->nr_rates; i++) 106 if (fp->rate_table[i] == subs->cur_rate) 107 break; 108 if (i >= fp->nr_rates) 109 continue; 110 } 111 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE; 112 if (! found) { 113 found = fp; 114 cur_attr = attr; 115 continue; 116 } 117 /* avoid async out and adaptive in if the other method 118 * supports the same format. 119 * this is a workaround for the case like 120 * M-audio audiophile USB. 121 */ 122 if (attr != cur_attr) { 123 if ((attr == USB_ENDPOINT_SYNC_ASYNC && 124 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 125 (attr == USB_ENDPOINT_SYNC_ADAPTIVE && 126 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) 127 continue; 128 if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC && 129 subs->direction == SNDRV_PCM_STREAM_PLAYBACK) || 130 (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE && 131 subs->direction == SNDRV_PCM_STREAM_CAPTURE)) { 132 found = fp; 133 cur_attr = attr; 134 continue; 135 } 136 } 137 /* find the format with the largest max. packet size */ 138 if (fp->maxpacksize > found->maxpacksize) { 139 found = fp; 140 cur_attr = attr; 141 } 142 } 143 return found; 144 } 145 146 static int init_pitch_v1(struct snd_usb_audio *chip, int iface, 147 struct usb_host_interface *alts, 148 struct audioformat *fmt) 149 { 150 struct usb_device *dev = chip->dev; 151 unsigned int ep; 152 unsigned char data[1]; 153 int err; 154 155 ep = get_endpoint(alts, 0)->bEndpointAddress; 156 157 data[0] = 1; 158 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, 159 USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT, 160 UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep, 161 data, sizeof(data))) < 0) { 162 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n", 163 dev->devnum, iface, ep); 164 return err; 165 } 166 167 return 0; 168 } 169 170 static int init_pitch_v2(struct snd_usb_audio *chip, int iface, 171 struct usb_host_interface *alts, 172 struct audioformat *fmt) 173 { 174 struct usb_device *dev = chip->dev; 175 unsigned char data[1]; 176 unsigned int ep; 177 int err; 178 179 ep = get_endpoint(alts, 0)->bEndpointAddress; 180 181 data[0] = 1; 182 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR, 183 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT, 184 UAC2_EP_CS_PITCH << 8, 0, 185 data, sizeof(data))) < 0) { 186 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n", 187 dev->devnum, iface, fmt->altsetting); 188 return err; 189 } 190 191 return 0; 192 } 193 194 /* 195 * initialize the pitch control and sample rate 196 */ 197 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface, 198 struct usb_host_interface *alts, 199 struct audioformat *fmt) 200 { 201 struct usb_interface_descriptor *altsd = get_iface_desc(alts); 202 203 /* if endpoint doesn't have pitch control, bail out */ 204 if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL)) 205 return 0; 206 207 switch (altsd->bInterfaceProtocol) { 208 case UAC_VERSION_1: 209 default: 210 return init_pitch_v1(chip, iface, alts, fmt); 211 212 case UAC_VERSION_2: 213 return init_pitch_v2(chip, iface, alts, fmt); 214 } 215 } 216 217 static int start_endpoints(struct snd_usb_substream *subs, int can_sleep) 218 { 219 int err; 220 221 if (!subs->data_endpoint) 222 return -EINVAL; 223 224 if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) { 225 struct snd_usb_endpoint *ep = subs->data_endpoint; 226 227 snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep); 228 229 ep->data_subs = subs; 230 err = snd_usb_endpoint_start(ep, can_sleep); 231 if (err < 0) { 232 clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags); 233 return err; 234 } 235 } 236 237 if (subs->sync_endpoint && 238 !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { 239 struct snd_usb_endpoint *ep = subs->sync_endpoint; 240 241 if (subs->data_endpoint->iface != subs->sync_endpoint->iface || 242 subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) { 243 err = usb_set_interface(subs->dev, 244 subs->sync_endpoint->iface, 245 subs->sync_endpoint->alt_idx); 246 if (err < 0) { 247 snd_printk(KERN_ERR 248 "%d:%d:%d: cannot set interface (%d)\n", 249 subs->dev->devnum, 250 subs->sync_endpoint->iface, 251 subs->sync_endpoint->alt_idx, err); 252 return -EIO; 253 } 254 } 255 256 snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep); 257 258 ep->sync_slave = subs->data_endpoint; 259 err = snd_usb_endpoint_start(ep, can_sleep); 260 if (err < 0) { 261 clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); 262 return err; 263 } 264 } 265 266 return 0; 267 } 268 269 static void stop_endpoints(struct snd_usb_substream *subs, 270 int force, int can_sleep, int wait) 271 { 272 if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) 273 snd_usb_endpoint_stop(subs->sync_endpoint, 274 force, can_sleep, wait); 275 276 if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) 277 snd_usb_endpoint_stop(subs->data_endpoint, 278 force, can_sleep, wait); 279 } 280 281 static int deactivate_endpoints(struct snd_usb_substream *subs) 282 { 283 int reta, retb; 284 285 reta = snd_usb_endpoint_deactivate(subs->sync_endpoint); 286 retb = snd_usb_endpoint_deactivate(subs->data_endpoint); 287 288 if (reta < 0) 289 return reta; 290 291 if (retb < 0) 292 return retb; 293 294 return 0; 295 } 296 297 /* 298 * find a matching format and set up the interface 299 */ 300 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) 301 { 302 struct usb_device *dev = subs->dev; 303 struct usb_host_interface *alts; 304 struct usb_interface_descriptor *altsd; 305 struct usb_interface *iface; 306 unsigned int ep, attr; 307 int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; 308 int err, implicit_fb = 0; 309 310 iface = usb_ifnum_to_if(dev, fmt->iface); 311 if (WARN_ON(!iface)) 312 return -EINVAL; 313 alts = &iface->altsetting[fmt->altset_idx]; 314 altsd = get_iface_desc(alts); 315 if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting)) 316 return -EINVAL; 317 318 if (fmt == subs->cur_audiofmt) 319 return 0; 320 321 /* close the old interface */ 322 if (subs->interface >= 0 && subs->interface != fmt->iface) { 323 err = usb_set_interface(subs->dev, subs->interface, 0); 324 if (err < 0) { 325 snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n", 326 dev->devnum, fmt->iface, fmt->altsetting, err); 327 return -EIO; 328 } 329 subs->interface = -1; 330 subs->altset_idx = 0; 331 } 332 333 /* set interface */ 334 if (subs->interface != fmt->iface || 335 subs->altset_idx != fmt->altset_idx) { 336 err = usb_set_interface(dev, fmt->iface, fmt->altsetting); 337 if (err < 0) { 338 snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n", 339 dev->devnum, fmt->iface, fmt->altsetting, err); 340 return -EIO; 341 } 342 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", 343 fmt->iface, fmt->altsetting); 344 subs->interface = fmt->iface; 345 subs->altset_idx = fmt->altset_idx; 346 } 347 348 subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip, 349 alts, fmt->endpoint, subs->direction, 350 SND_USB_ENDPOINT_TYPE_DATA); 351 if (!subs->data_endpoint) 352 return -EINVAL; 353 354 /* we need a sync pipe in async OUT or adaptive IN mode */ 355 /* check the number of EP, since some devices have broken 356 * descriptors which fool us. if it has only one EP, 357 * assume it as adaptive-out or sync-in. 358 */ 359 attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE; 360 361 switch (subs->stream->chip->usb_id) { 362 case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */ 363 case USB_ID(0x0763, 0x2081): 364 if (is_playback) { 365 implicit_fb = 1; 366 ep = 0x81; 367 iface = usb_ifnum_to_if(dev, 2); 368 369 if (!iface || iface->num_altsetting == 0) 370 return -EINVAL; 371 372 alts = &iface->altsetting[1]; 373 goto add_sync_ep; 374 } 375 } 376 377 if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) || 378 (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) && 379 altsd->bNumEndpoints >= 2) { 380 /* check sync-pipe endpoint */ 381 /* ... and check descriptor size before accessing bSynchAddress 382 because there is a version of the SB Audigy 2 NX firmware lacking 383 the audio fields in the endpoint descriptors */ 384 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 || 385 (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 386 get_endpoint(alts, 1)->bSynchAddress != 0 && 387 !implicit_fb)) { 388 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n", 389 dev->devnum, fmt->iface, fmt->altsetting, 390 get_endpoint(alts, 1)->bmAttributes, 391 get_endpoint(alts, 1)->bLength, 392 get_endpoint(alts, 1)->bSynchAddress); 393 return -EINVAL; 394 } 395 ep = get_endpoint(alts, 1)->bEndpointAddress; 396 if (!implicit_fb && 397 get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && 398 (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) || 399 (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) { 400 snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n", 401 dev->devnum, fmt->iface, fmt->altsetting, 402 is_playback, ep, get_endpoint(alts, 0)->bSynchAddress); 403 return -EINVAL; 404 } 405 406 implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK) 407 == USB_ENDPOINT_USAGE_IMPLICIT_FB; 408 409 add_sync_ep: 410 subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip, 411 alts, ep, !subs->direction, 412 implicit_fb ? 413 SND_USB_ENDPOINT_TYPE_DATA : 414 SND_USB_ENDPOINT_TYPE_SYNC); 415 if (!subs->sync_endpoint) 416 return -EINVAL; 417 418 subs->data_endpoint->sync_master = subs->sync_endpoint; 419 } 420 421 if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0) 422 return err; 423 424 subs->cur_audiofmt = fmt; 425 426 snd_usb_set_format_quirk(subs, fmt); 427 428 #if 0 429 printk(KERN_DEBUG 430 "setting done: format = %d, rate = %d..%d, channels = %d\n", 431 fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels); 432 printk(KERN_DEBUG 433 " datapipe = 0x%0x, syncpipe = 0x%0x\n", 434 subs->datapipe, subs->syncpipe); 435 #endif 436 437 return 0; 438 } 439 440 /* 441 * configure endpoint params 442 * 443 * called during initial setup and upon resume 444 */ 445 static int configure_endpoint(struct snd_usb_substream *subs) 446 { 447 int ret; 448 449 /* format changed */ 450 stop_endpoints(subs, 0, 0, 0); 451 ret = snd_usb_endpoint_set_params(subs->data_endpoint, 452 subs->pcm_format, 453 subs->channels, 454 subs->period_bytes, 455 subs->cur_rate, 456 subs->cur_audiofmt, 457 subs->sync_endpoint); 458 if (ret < 0) 459 return ret; 460 461 if (subs->sync_endpoint) 462 ret = snd_usb_endpoint_set_params(subs->sync_endpoint, 463 subs->pcm_format, 464 subs->channels, 465 subs->period_bytes, 466 subs->cur_rate, 467 subs->cur_audiofmt, 468 NULL); 469 return ret; 470 } 471 472 /* 473 * hw_params callback 474 * 475 * allocate a buffer and set the given audio format. 476 * 477 * so far we use a physically linear buffer although packetize transfer 478 * doesn't need a continuous area. 479 * if sg buffer is supported on the later version of alsa, we'll follow 480 * that. 481 */ 482 static int snd_usb_hw_params(struct snd_pcm_substream *substream, 483 struct snd_pcm_hw_params *hw_params) 484 { 485 struct snd_usb_substream *subs = substream->runtime->private_data; 486 struct audioformat *fmt; 487 int ret; 488 489 ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, 490 params_buffer_bytes(hw_params)); 491 if (ret < 0) 492 return ret; 493 494 subs->pcm_format = params_format(hw_params); 495 subs->period_bytes = params_period_bytes(hw_params); 496 subs->channels = params_channels(hw_params); 497 subs->cur_rate = params_rate(hw_params); 498 499 fmt = find_format(subs); 500 if (!fmt) { 501 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n", 502 subs->pcm_format, subs->cur_rate, subs->channels); 503 return -EINVAL; 504 } 505 506 down_read(&subs->stream->chip->shutdown_rwsem); 507 if (subs->stream->chip->shutdown) 508 ret = -ENODEV; 509 else 510 ret = set_format(subs, fmt); 511 up_read(&subs->stream->chip->shutdown_rwsem); 512 if (ret < 0) 513 return ret; 514 515 subs->interface = fmt->iface; 516 subs->altset_idx = fmt->altset_idx; 517 subs->need_setup_ep = true; 518 519 return 0; 520 } 521 522 /* 523 * hw_free callback 524 * 525 * reset the audio format and release the buffer 526 */ 527 static int snd_usb_hw_free(struct snd_pcm_substream *substream) 528 { 529 struct snd_usb_substream *subs = substream->runtime->private_data; 530 531 subs->cur_audiofmt = NULL; 532 subs->cur_rate = 0; 533 subs->period_bytes = 0; 534 down_read(&subs->stream->chip->shutdown_rwsem); 535 if (!subs->stream->chip->shutdown) { 536 stop_endpoints(subs, 0, 1, 1); 537 deactivate_endpoints(subs); 538 } 539 up_read(&subs->stream->chip->shutdown_rwsem); 540 return snd_pcm_lib_free_vmalloc_buffer(substream); 541 } 542 543 /* 544 * prepare callback 545 * 546 * only a few subtle things... 547 */ 548 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) 549 { 550 struct snd_pcm_runtime *runtime = substream->runtime; 551 struct snd_usb_substream *subs = runtime->private_data; 552 struct usb_host_interface *alts; 553 struct usb_interface *iface; 554 int ret; 555 556 if (! subs->cur_audiofmt) { 557 snd_printk(KERN_ERR "usbaudio: no format is specified!\n"); 558 return -ENXIO; 559 } 560 561 down_read(&subs->stream->chip->shutdown_rwsem); 562 if (subs->stream->chip->shutdown) { 563 ret = -ENODEV; 564 goto unlock; 565 } 566 if (snd_BUG_ON(!subs->data_endpoint)) { 567 ret = -EIO; 568 goto unlock; 569 } 570 571 snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint); 572 snd_usb_endpoint_sync_pending_stop(subs->data_endpoint); 573 574 ret = set_format(subs, subs->cur_audiofmt); 575 if (ret < 0) 576 goto unlock; 577 578 iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); 579 alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; 580 ret = snd_usb_init_sample_rate(subs->stream->chip, 581 subs->cur_audiofmt->iface, 582 alts, 583 subs->cur_audiofmt, 584 subs->cur_rate); 585 if (ret < 0) 586 goto unlock; 587 588 if (subs->need_setup_ep) { 589 ret = configure_endpoint(subs); 590 if (ret < 0) 591 goto unlock; 592 subs->need_setup_ep = false; 593 } 594 595 /* some unit conversions in runtime */ 596 subs->data_endpoint->maxframesize = 597 bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); 598 subs->data_endpoint->curframesize = 599 bytes_to_frames(runtime, subs->data_endpoint->curpacksize); 600 601 /* reset the pointer */ 602 subs->hwptr_done = 0; 603 subs->transfer_done = 0; 604 subs->last_delay = 0; 605 subs->last_frame_number = 0; 606 runtime->delay = 0; 607 608 /* for playback, submit the URBs now; otherwise, the first hwptr_done 609 * updates for all URBs would happen at the same time when starting */ 610 if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) 611 ret = start_endpoints(subs, 1); 612 613 unlock: 614 up_read(&subs->stream->chip->shutdown_rwsem); 615 return ret; 616 } 617 618 static struct snd_pcm_hardware snd_usb_hardware = 619 { 620 .info = SNDRV_PCM_INFO_MMAP | 621 SNDRV_PCM_INFO_MMAP_VALID | 622 SNDRV_PCM_INFO_BATCH | 623 SNDRV_PCM_INFO_INTERLEAVED | 624 SNDRV_PCM_INFO_BLOCK_TRANSFER | 625 SNDRV_PCM_INFO_PAUSE, 626 .buffer_bytes_max = 1024 * 1024, 627 .period_bytes_min = 64, 628 .period_bytes_max = 512 * 1024, 629 .periods_min = 2, 630 .periods_max = 1024, 631 }; 632 633 static int hw_check_valid_format(struct snd_usb_substream *subs, 634 struct snd_pcm_hw_params *params, 635 struct audioformat *fp) 636 { 637 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 638 struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 639 struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 640 struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 641 struct snd_mask check_fmts; 642 unsigned int ptime; 643 644 /* check the format */ 645 snd_mask_none(&check_fmts); 646 check_fmts.bits[0] = (u32)fp->formats; 647 check_fmts.bits[1] = (u32)(fp->formats >> 32); 648 snd_mask_intersect(&check_fmts, fmts); 649 if (snd_mask_empty(&check_fmts)) { 650 hwc_debug(" > check: no supported format %d\n", fp->format); 651 return 0; 652 } 653 /* check the channels */ 654 if (fp->channels < ct->min || fp->channels > ct->max) { 655 hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max); 656 return 0; 657 } 658 /* check the rate is within the range */ 659 if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) { 660 hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max); 661 return 0; 662 } 663 if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) { 664 hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min); 665 return 0; 666 } 667 /* check whether the period time is >= the data packet interval */ 668 if (subs->speed != USB_SPEED_FULL) { 669 ptime = 125 * (1 << fp->datainterval); 670 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) { 671 hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max); 672 return 0; 673 } 674 } 675 return 1; 676 } 677 678 static int hw_rule_rate(struct snd_pcm_hw_params *params, 679 struct snd_pcm_hw_rule *rule) 680 { 681 struct snd_usb_substream *subs = rule->private; 682 struct list_head *p; 683 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 684 unsigned int rmin, rmax; 685 int changed; 686 687 hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max); 688 changed = 0; 689 rmin = rmax = 0; 690 list_for_each(p, &subs->fmt_list) { 691 struct audioformat *fp; 692 fp = list_entry(p, struct audioformat, list); 693 if (!hw_check_valid_format(subs, params, fp)) 694 continue; 695 if (changed++) { 696 if (rmin > fp->rate_min) 697 rmin = fp->rate_min; 698 if (rmax < fp->rate_max) 699 rmax = fp->rate_max; 700 } else { 701 rmin = fp->rate_min; 702 rmax = fp->rate_max; 703 } 704 } 705 706 if (!changed) { 707 hwc_debug(" --> get empty\n"); 708 it->empty = 1; 709 return -EINVAL; 710 } 711 712 changed = 0; 713 if (it->min < rmin) { 714 it->min = rmin; 715 it->openmin = 0; 716 changed = 1; 717 } 718 if (it->max > rmax) { 719 it->max = rmax; 720 it->openmax = 0; 721 changed = 1; 722 } 723 if (snd_interval_checkempty(it)) { 724 it->empty = 1; 725 return -EINVAL; 726 } 727 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 728 return changed; 729 } 730 731 732 static int hw_rule_channels(struct snd_pcm_hw_params *params, 733 struct snd_pcm_hw_rule *rule) 734 { 735 struct snd_usb_substream *subs = rule->private; 736 struct list_head *p; 737 struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 738 unsigned int rmin, rmax; 739 int changed; 740 741 hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max); 742 changed = 0; 743 rmin = rmax = 0; 744 list_for_each(p, &subs->fmt_list) { 745 struct audioformat *fp; 746 fp = list_entry(p, struct audioformat, list); 747 if (!hw_check_valid_format(subs, params, fp)) 748 continue; 749 if (changed++) { 750 if (rmin > fp->channels) 751 rmin = fp->channels; 752 if (rmax < fp->channels) 753 rmax = fp->channels; 754 } else { 755 rmin = fp->channels; 756 rmax = fp->channels; 757 } 758 } 759 760 if (!changed) { 761 hwc_debug(" --> get empty\n"); 762 it->empty = 1; 763 return -EINVAL; 764 } 765 766 changed = 0; 767 if (it->min < rmin) { 768 it->min = rmin; 769 it->openmin = 0; 770 changed = 1; 771 } 772 if (it->max > rmax) { 773 it->max = rmax; 774 it->openmax = 0; 775 changed = 1; 776 } 777 if (snd_interval_checkempty(it)) { 778 it->empty = 1; 779 return -EINVAL; 780 } 781 hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed); 782 return changed; 783 } 784 785 static int hw_rule_format(struct snd_pcm_hw_params *params, 786 struct snd_pcm_hw_rule *rule) 787 { 788 struct snd_usb_substream *subs = rule->private; 789 struct list_head *p; 790 struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 791 u64 fbits; 792 u32 oldbits[2]; 793 int changed; 794 795 hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]); 796 fbits = 0; 797 list_for_each(p, &subs->fmt_list) { 798 struct audioformat *fp; 799 fp = list_entry(p, struct audioformat, list); 800 if (!hw_check_valid_format(subs, params, fp)) 801 continue; 802 fbits |= fp->formats; 803 } 804 805 oldbits[0] = fmt->bits[0]; 806 oldbits[1] = fmt->bits[1]; 807 fmt->bits[0] &= (u32)fbits; 808 fmt->bits[1] &= (u32)(fbits >> 32); 809 if (!fmt->bits[0] && !fmt->bits[1]) { 810 hwc_debug(" --> get empty\n"); 811 return -EINVAL; 812 } 813 changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]); 814 hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed); 815 return changed; 816 } 817 818 static int hw_rule_period_time(struct snd_pcm_hw_params *params, 819 struct snd_pcm_hw_rule *rule) 820 { 821 struct snd_usb_substream *subs = rule->private; 822 struct audioformat *fp; 823 struct snd_interval *it; 824 unsigned char min_datainterval; 825 unsigned int pmin; 826 int changed; 827 828 it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME); 829 hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max); 830 min_datainterval = 0xff; 831 list_for_each_entry(fp, &subs->fmt_list, list) { 832 if (!hw_check_valid_format(subs, params, fp)) 833 continue; 834 min_datainterval = min(min_datainterval, fp->datainterval); 835 } 836 if (min_datainterval == 0xff) { 837 hwc_debug(" --> get empty\n"); 838 it->empty = 1; 839 return -EINVAL; 840 } 841 pmin = 125 * (1 << min_datainterval); 842 changed = 0; 843 if (it->min < pmin) { 844 it->min = pmin; 845 it->openmin = 0; 846 changed = 1; 847 } 848 if (snd_interval_checkempty(it)) { 849 it->empty = 1; 850 return -EINVAL; 851 } 852 hwc_debug(" --> (%u,%u) (changed = %d)\n", it->min, it->max, changed); 853 return changed; 854 } 855 856 /* 857 * If the device supports unusual bit rates, does the request meet these? 858 */ 859 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime, 860 struct snd_usb_substream *subs) 861 { 862 struct audioformat *fp; 863 int *rate_list; 864 int count = 0, needs_knot = 0; 865 int err; 866 867 kfree(subs->rate_list.list); 868 subs->rate_list.list = NULL; 869 870 list_for_each_entry(fp, &subs->fmt_list, list) { 871 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) 872 return 0; 873 count += fp->nr_rates; 874 if (fp->rates & SNDRV_PCM_RATE_KNOT) 875 needs_knot = 1; 876 } 877 if (!needs_knot) 878 return 0; 879 880 subs->rate_list.list = rate_list = 881 kmalloc(sizeof(int) * count, GFP_KERNEL); 882 if (!subs->rate_list.list) 883 return -ENOMEM; 884 subs->rate_list.count = count; 885 subs->rate_list.mask = 0; 886 count = 0; 887 list_for_each_entry(fp, &subs->fmt_list, list) { 888 int i; 889 for (i = 0; i < fp->nr_rates; i++) 890 rate_list[count++] = fp->rate_table[i]; 891 } 892 err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 893 &subs->rate_list); 894 if (err < 0) 895 return err; 896 897 return 0; 898 } 899 900 901 /* 902 * set up the runtime hardware information. 903 */ 904 905 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs) 906 { 907 struct list_head *p; 908 unsigned int pt, ptmin; 909 int param_period_time_if_needed; 910 int err; 911 912 runtime->hw.formats = subs->formats; 913 914 runtime->hw.rate_min = 0x7fffffff; 915 runtime->hw.rate_max = 0; 916 runtime->hw.channels_min = 256; 917 runtime->hw.channels_max = 0; 918 runtime->hw.rates = 0; 919 ptmin = UINT_MAX; 920 /* check min/max rates and channels */ 921 list_for_each(p, &subs->fmt_list) { 922 struct audioformat *fp; 923 fp = list_entry(p, struct audioformat, list); 924 runtime->hw.rates |= fp->rates; 925 if (runtime->hw.rate_min > fp->rate_min) 926 runtime->hw.rate_min = fp->rate_min; 927 if (runtime->hw.rate_max < fp->rate_max) 928 runtime->hw.rate_max = fp->rate_max; 929 if (runtime->hw.channels_min > fp->channels) 930 runtime->hw.channels_min = fp->channels; 931 if (runtime->hw.channels_max < fp->channels) 932 runtime->hw.channels_max = fp->channels; 933 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) { 934 /* FIXME: there might be more than one audio formats... */ 935 runtime->hw.period_bytes_min = runtime->hw.period_bytes_max = 936 fp->frame_size; 937 } 938 pt = 125 * (1 << fp->datainterval); 939 ptmin = min(ptmin, pt); 940 } 941 err = snd_usb_autoresume(subs->stream->chip); 942 if (err < 0) 943 return err; 944 945 param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME; 946 if (subs->speed == USB_SPEED_FULL) 947 /* full speed devices have fixed data packet interval */ 948 ptmin = 1000; 949 if (ptmin == 1000) 950 /* if period time doesn't go below 1 ms, no rules needed */ 951 param_period_time_if_needed = -1; 952 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 953 ptmin, UINT_MAX); 954 955 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 956 hw_rule_rate, subs, 957 SNDRV_PCM_HW_PARAM_FORMAT, 958 SNDRV_PCM_HW_PARAM_CHANNELS, 959 param_period_time_if_needed, 960 -1)) < 0) 961 goto rep_err; 962 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 963 hw_rule_channels, subs, 964 SNDRV_PCM_HW_PARAM_FORMAT, 965 SNDRV_PCM_HW_PARAM_RATE, 966 param_period_time_if_needed, 967 -1)) < 0) 968 goto rep_err; 969 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 970 hw_rule_format, subs, 971 SNDRV_PCM_HW_PARAM_RATE, 972 SNDRV_PCM_HW_PARAM_CHANNELS, 973 param_period_time_if_needed, 974 -1)) < 0) 975 goto rep_err; 976 if (param_period_time_if_needed >= 0) { 977 err = snd_pcm_hw_rule_add(runtime, 0, 978 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 979 hw_rule_period_time, subs, 980 SNDRV_PCM_HW_PARAM_FORMAT, 981 SNDRV_PCM_HW_PARAM_CHANNELS, 982 SNDRV_PCM_HW_PARAM_RATE, 983 -1); 984 if (err < 0) 985 goto rep_err; 986 } 987 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0) 988 goto rep_err; 989 return 0; 990 991 rep_err: 992 snd_usb_autosuspend(subs->stream->chip); 993 return err; 994 } 995 996 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction) 997 { 998 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 999 struct snd_pcm_runtime *runtime = substream->runtime; 1000 struct snd_usb_substream *subs = &as->substream[direction]; 1001 1002 subs->interface = -1; 1003 subs->altset_idx = 0; 1004 runtime->hw = snd_usb_hardware; 1005 runtime->private_data = subs; 1006 subs->pcm_substream = substream; 1007 /* runtime PM is also done there */ 1008 return setup_hw_info(runtime, subs); 1009 } 1010 1011 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction) 1012 { 1013 struct snd_usb_stream *as = snd_pcm_substream_chip(substream); 1014 struct snd_usb_substream *subs = &as->substream[direction]; 1015 1016 stop_endpoints(subs, 0, 0, 0); 1017 1018 if (!as->chip->shutdown && subs->interface >= 0) { 1019 usb_set_interface(subs->dev, subs->interface, 0); 1020 subs->interface = -1; 1021 } 1022 1023 subs->pcm_substream = NULL; 1024 snd_usb_autosuspend(subs->stream->chip); 1025 1026 return 0; 1027 } 1028 1029 /* Since a URB can handle only a single linear buffer, we must use double 1030 * buffering when the data to be transferred overflows the buffer boundary. 1031 * To avoid inconsistencies when updating hwptr_done, we use double buffering 1032 * for all URBs. 1033 */ 1034 static void retire_capture_urb(struct snd_usb_substream *subs, 1035 struct urb *urb) 1036 { 1037 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1038 unsigned int stride, frames, bytes, oldptr; 1039 int i, period_elapsed = 0; 1040 unsigned long flags; 1041 unsigned char *cp; 1042 1043 stride = runtime->frame_bits >> 3; 1044 1045 for (i = 0; i < urb->number_of_packets; i++) { 1046 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; 1047 if (urb->iso_frame_desc[i].status && printk_ratelimit()) { 1048 snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status); 1049 // continue; 1050 } 1051 bytes = urb->iso_frame_desc[i].actual_length; 1052 frames = bytes / stride; 1053 if (!subs->txfr_quirk) 1054 bytes = frames * stride; 1055 if (bytes % (runtime->sample_bits >> 3) != 0) { 1056 #ifdef CONFIG_SND_DEBUG_VERBOSE 1057 int oldbytes = bytes; 1058 #endif 1059 bytes = frames * stride; 1060 snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n", 1061 oldbytes, bytes); 1062 } 1063 /* update the current pointer */ 1064 spin_lock_irqsave(&subs->lock, flags); 1065 oldptr = subs->hwptr_done; 1066 subs->hwptr_done += bytes; 1067 if (subs->hwptr_done >= runtime->buffer_size * stride) 1068 subs->hwptr_done -= runtime->buffer_size * stride; 1069 frames = (bytes + (oldptr % stride)) / stride; 1070 subs->transfer_done += frames; 1071 if (subs->transfer_done >= runtime->period_size) { 1072 subs->transfer_done -= runtime->period_size; 1073 period_elapsed = 1; 1074 } 1075 spin_unlock_irqrestore(&subs->lock, flags); 1076 /* copy a data chunk */ 1077 if (oldptr + bytes > runtime->buffer_size * stride) { 1078 unsigned int bytes1 = 1079 runtime->buffer_size * stride - oldptr; 1080 memcpy(runtime->dma_area + oldptr, cp, bytes1); 1081 memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1); 1082 } else { 1083 memcpy(runtime->dma_area + oldptr, cp, bytes); 1084 } 1085 } 1086 1087 if (period_elapsed) 1088 snd_pcm_period_elapsed(subs->pcm_substream); 1089 } 1090 1091 static void prepare_playback_urb(struct snd_usb_substream *subs, 1092 struct urb *urb) 1093 { 1094 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1095 struct snd_usb_endpoint *ep = subs->data_endpoint; 1096 struct snd_urb_ctx *ctx = urb->context; 1097 unsigned int counts, frames, bytes; 1098 int i, stride, period_elapsed = 0; 1099 unsigned long flags; 1100 1101 stride = runtime->frame_bits >> 3; 1102 1103 frames = 0; 1104 urb->number_of_packets = 0; 1105 spin_lock_irqsave(&subs->lock, flags); 1106 for (i = 0; i < ctx->packets; i++) { 1107 if (ctx->packet_size[i]) 1108 counts = ctx->packet_size[i]; 1109 else 1110 counts = snd_usb_endpoint_next_packet_size(ep); 1111 1112 /* set up descriptor */ 1113 urb->iso_frame_desc[i].offset = frames * stride; 1114 urb->iso_frame_desc[i].length = counts * stride; 1115 frames += counts; 1116 urb->number_of_packets++; 1117 subs->transfer_done += counts; 1118 if (subs->transfer_done >= runtime->period_size) { 1119 subs->transfer_done -= runtime->period_size; 1120 period_elapsed = 1; 1121 if (subs->fmt_type == UAC_FORMAT_TYPE_II) { 1122 if (subs->transfer_done > 0) { 1123 /* FIXME: fill-max mode is not 1124 * supported yet */ 1125 frames -= subs->transfer_done; 1126 counts -= subs->transfer_done; 1127 urb->iso_frame_desc[i].length = 1128 counts * stride; 1129 subs->transfer_done = 0; 1130 } 1131 i++; 1132 if (i < ctx->packets) { 1133 /* add a transfer delimiter */ 1134 urb->iso_frame_desc[i].offset = 1135 frames * stride; 1136 urb->iso_frame_desc[i].length = 0; 1137 urb->number_of_packets++; 1138 } 1139 break; 1140 } 1141 } 1142 if (period_elapsed && 1143 !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */ 1144 break; 1145 } 1146 bytes = frames * stride; 1147 if (subs->hwptr_done + bytes > runtime->buffer_size * stride) { 1148 /* err, the transferred area goes over buffer boundary. */ 1149 unsigned int bytes1 = 1150 runtime->buffer_size * stride - subs->hwptr_done; 1151 memcpy(urb->transfer_buffer, 1152 runtime->dma_area + subs->hwptr_done, bytes1); 1153 memcpy(urb->transfer_buffer + bytes1, 1154 runtime->dma_area, bytes - bytes1); 1155 } else { 1156 memcpy(urb->transfer_buffer, 1157 runtime->dma_area + subs->hwptr_done, bytes); 1158 } 1159 subs->hwptr_done += bytes; 1160 if (subs->hwptr_done >= runtime->buffer_size * stride) 1161 subs->hwptr_done -= runtime->buffer_size * stride; 1162 1163 /* update delay with exact number of samples queued */ 1164 runtime->delay = subs->last_delay; 1165 runtime->delay += frames; 1166 subs->last_delay = runtime->delay; 1167 1168 /* realign last_frame_number */ 1169 subs->last_frame_number = usb_get_current_frame_number(subs->dev); 1170 subs->last_frame_number &= 0xFF; /* keep 8 LSBs */ 1171 1172 spin_unlock_irqrestore(&subs->lock, flags); 1173 urb->transfer_buffer_length = bytes; 1174 if (period_elapsed) 1175 snd_pcm_period_elapsed(subs->pcm_substream); 1176 } 1177 1178 /* 1179 * process after playback data complete 1180 * - decrease the delay count again 1181 */ 1182 static void retire_playback_urb(struct snd_usb_substream *subs, 1183 struct urb *urb) 1184 { 1185 unsigned long flags; 1186 struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime; 1187 int stride = runtime->frame_bits >> 3; 1188 int processed = urb->transfer_buffer_length / stride; 1189 int est_delay; 1190 1191 /* ignore the delay accounting when procssed=0 is given, i.e. 1192 * silent payloads are procssed before handling the actual data 1193 */ 1194 if (!processed) 1195 return; 1196 1197 spin_lock_irqsave(&subs->lock, flags); 1198 est_delay = snd_usb_pcm_delay(subs, runtime->rate); 1199 /* update delay with exact number of samples played */ 1200 if (processed > subs->last_delay) 1201 subs->last_delay = 0; 1202 else 1203 subs->last_delay -= processed; 1204 runtime->delay = subs->last_delay; 1205 1206 /* 1207 * Report when delay estimate is off by more than 2ms. 1208 * The error should be lower than 2ms since the estimate relies 1209 * on two reads of a counter updated every ms. 1210 */ 1211 if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2) 1212 snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n", 1213 est_delay, subs->last_delay); 1214 1215 spin_unlock_irqrestore(&subs->lock, flags); 1216 } 1217 1218 static int snd_usb_playback_open(struct snd_pcm_substream *substream) 1219 { 1220 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK); 1221 } 1222 1223 static int snd_usb_playback_close(struct snd_pcm_substream *substream) 1224 { 1225 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK); 1226 } 1227 1228 static int snd_usb_capture_open(struct snd_pcm_substream *substream) 1229 { 1230 return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE); 1231 } 1232 1233 static int snd_usb_capture_close(struct snd_pcm_substream *substream) 1234 { 1235 return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE); 1236 } 1237 1238 static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, 1239 int cmd) 1240 { 1241 struct snd_usb_substream *subs = substream->runtime->private_data; 1242 1243 switch (cmd) { 1244 case SNDRV_PCM_TRIGGER_START: 1245 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1246 subs->data_endpoint->prepare_data_urb = prepare_playback_urb; 1247 subs->data_endpoint->retire_data_urb = retire_playback_urb; 1248 subs->running = 1; 1249 return 0; 1250 case SNDRV_PCM_TRIGGER_STOP: 1251 stop_endpoints(subs, 0, 0, 0); 1252 subs->running = 0; 1253 return 0; 1254 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1255 subs->data_endpoint->prepare_data_urb = NULL; 1256 subs->data_endpoint->retire_data_urb = NULL; 1257 subs->running = 0; 1258 return 0; 1259 } 1260 1261 return -EINVAL; 1262 } 1263 1264 static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, 1265 int cmd) 1266 { 1267 int err; 1268 struct snd_usb_substream *subs = substream->runtime->private_data; 1269 1270 switch (cmd) { 1271 case SNDRV_PCM_TRIGGER_START: 1272 err = start_endpoints(subs, 0); 1273 if (err < 0) 1274 return err; 1275 1276 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1277 subs->running = 1; 1278 return 0; 1279 case SNDRV_PCM_TRIGGER_STOP: 1280 stop_endpoints(subs, 0, 0, 0); 1281 subs->running = 0; 1282 return 0; 1283 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1284 subs->data_endpoint->retire_data_urb = NULL; 1285 subs->running = 0; 1286 return 0; 1287 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1288 subs->data_endpoint->retire_data_urb = retire_capture_urb; 1289 subs->running = 1; 1290 return 0; 1291 } 1292 1293 return -EINVAL; 1294 } 1295 1296 static struct snd_pcm_ops snd_usb_playback_ops = { 1297 .open = snd_usb_playback_open, 1298 .close = snd_usb_playback_close, 1299 .ioctl = snd_pcm_lib_ioctl, 1300 .hw_params = snd_usb_hw_params, 1301 .hw_free = snd_usb_hw_free, 1302 .prepare = snd_usb_pcm_prepare, 1303 .trigger = snd_usb_substream_playback_trigger, 1304 .pointer = snd_usb_pcm_pointer, 1305 .page = snd_pcm_lib_get_vmalloc_page, 1306 .mmap = snd_pcm_lib_mmap_vmalloc, 1307 }; 1308 1309 static struct snd_pcm_ops snd_usb_capture_ops = { 1310 .open = snd_usb_capture_open, 1311 .close = snd_usb_capture_close, 1312 .ioctl = snd_pcm_lib_ioctl, 1313 .hw_params = snd_usb_hw_params, 1314 .hw_free = snd_usb_hw_free, 1315 .prepare = snd_usb_pcm_prepare, 1316 .trigger = snd_usb_substream_capture_trigger, 1317 .pointer = snd_usb_pcm_pointer, 1318 .page = snd_pcm_lib_get_vmalloc_page, 1319 .mmap = snd_pcm_lib_mmap_vmalloc, 1320 }; 1321 1322 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream) 1323 { 1324 snd_pcm_set_ops(pcm, stream, 1325 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1326 &snd_usb_playback_ops : &snd_usb_capture_ops); 1327 } 1328