1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
 
 
 
 
 
 
 
 
 
 
 
 
 
   3 */
   4
   5#include <linux/init.h>
   6#include <linux/slab.h>
   7#include <linux/bitrev.h>
   8#include <linux/ratelimit.h>
   9#include <linux/usb.h>
  10#include <linux/usb/audio.h>
  11#include <linux/usb/audio-v2.h>
  12
  13#include <sound/core.h>
  14#include <sound/pcm.h>
  15#include <sound/pcm_params.h>
  16
  17#include "usbaudio.h"
  18#include "card.h"
  19#include "quirks.h"
  20#include "debug.h"
  21#include "endpoint.h"
  22#include "helper.h"
  23#include "pcm.h"
  24#include "clock.h"
  25#include "power.h"
  26#include "media.h"
  27
  28#define SUBSTREAM_FLAG_DATA_EP_STARTED	0
  29#define SUBSTREAM_FLAG_SYNC_EP_STARTED	1
  30
  31/* return the estimated delay based on USB frame counters */
  32snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  33				    unsigned int rate)
  34{
  35	int current_frame_number;
  36	int frame_diff;
  37	int est_delay;
  38
  39	if (!subs->last_delay)
  40		return 0; /* short path */
  41
  42	current_frame_number = usb_get_current_frame_number(subs->dev);
  43	/*
  44	 * HCD implementations use different widths, use lower 8 bits.
  45	 * The delay will be managed up to 256ms, which is more than
  46	 * enough
  47	 */
  48	frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  49
  50	/* Approximation based on number of samples per USB frame (ms),
  51	   some truncation for 44.1 but the estimate is good enough */
  52	est_delay =  frame_diff * rate / 1000;
  53	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
  54		est_delay = subs->last_delay - est_delay;
  55	else
  56		est_delay = subs->last_delay + est_delay;
  57
  58	if (est_delay < 0)
  59		est_delay = 0;
  60	return est_delay;
  61}
  62
  63/*
  64 * return the current pcm pointer.  just based on the hwptr_done value.
  65 */
  66static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  67{
  68	struct snd_usb_substream *subs = substream->runtime->private_data;
  69	unsigned int hwptr_done;
  70
 
  71	if (atomic_read(&subs->stream->chip->shutdown))
  72		return SNDRV_PCM_POS_XRUN;
  73	spin_lock(&subs->lock);
  74	hwptr_done = subs->hwptr_done;
  75	substream->runtime->delay = snd_usb_pcm_delay(subs,
  76						substream->runtime->rate);
  77	spin_unlock(&subs->lock);
  78	return hwptr_done / (substream->runtime->frame_bits >> 3);
  79}
  80
  81/*
  82 * find a matching audio format
  83 */
  84static struct audioformat *find_format(struct snd_usb_substream *subs)
  85{
  86	struct audioformat *fp;
  87	struct audioformat *found = NULL;
  88	int cur_attr = 0, attr;
  89
  90	list_for_each_entry(fp, &subs->fmt_list, list) {
  91		if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
  92			continue;
  93		if (fp->channels != subs->channels)
  94			continue;
  95		if (subs->cur_rate < fp->rate_min ||
  96		    subs->cur_rate > fp->rate_max)
  97			continue;
  98		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  99			unsigned int i;
 100			for (i = 0; i < fp->nr_rates; i++)
 101				if (fp->rate_table[i] == subs->cur_rate)
 102					break;
 103			if (i >= fp->nr_rates)
 104				continue;
 105		}
 106		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 107		if (! found) {
 108			found = fp;
 109			cur_attr = attr;
 110			continue;
 111		}
 112		/* avoid async out and adaptive in if the other method
 113		 * supports the same format.
 114		 * this is a workaround for the case like
 115		 * M-audio audiophile USB.
 116		 */
 117		if (attr != cur_attr) {
 118			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 119			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 120			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 121			     subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 122				continue;
 123			if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 124			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 125			    (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 126			     subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 127				found = fp;
 128				cur_attr = attr;
 129				continue;
 130			}
 131		}
 132		/* find the format with the largest max. packet size */
 133		if (fp->maxpacksize > found->maxpacksize) {
 134			found = fp;
 135			cur_attr = attr;
 136		}
 137	}
 138	return found;
 139}
 140
 141static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 142			 struct usb_host_interface *alts,
 143			 struct audioformat *fmt)
 144{
 145	struct usb_device *dev = chip->dev;
 146	unsigned int ep;
 147	unsigned char data[1];
 148	int err;
 149
 150	if (get_iface_desc(alts)->bNumEndpoints < 1)
 151		return -EINVAL;
 152	ep = get_endpoint(alts, 0)->bEndpointAddress;
 153
 154	data[0] = 1;
 155	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 156			      USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 157			      UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 158			      data, sizeof(data));
 159	if (err < 0) {
 160		usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
 161			      iface, ep);
 162		return err;
 163	}
 164
 165	return 0;
 166}
 167
 168static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 169			 struct usb_host_interface *alts,
 170			 struct audioformat *fmt)
 171{
 172	struct usb_device *dev = chip->dev;
 173	unsigned char data[1];
 174	int err;
 175
 176	data[0] = 1;
 177	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 178			      USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 179			      UAC2_EP_CS_PITCH << 8, 0,
 180			      data, sizeof(data));
 181	if (err < 0) {
 182		usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
 183			      iface, fmt->altsetting);
 184		return err;
 185	}
 186
 187	return 0;
 188}
 189
 190/*
 191 * initialize the pitch control and sample rate
 192 */
 193int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 194		       struct usb_host_interface *alts,
 195		       struct audioformat *fmt)
 196{
 197	/* if endpoint doesn't have pitch control, bail out */
 198	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199		return 0;
 200
 201	switch (fmt->protocol) {
 202	case UAC_VERSION_1:
 203	default:
 204		return init_pitch_v1(chip, iface, alts, fmt);
 205
 206	case UAC_VERSION_2:
 207		return init_pitch_v2(chip, iface, alts, fmt);
 208	}
 209}
 210
 211static int start_endpoints(struct snd_usb_substream *subs)
 212{
 213	int err;
 214
 215	if (!subs->data_endpoint)
 216		return -EINVAL;
 217
 218	if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
 219		struct snd_usb_endpoint *ep = subs->data_endpoint;
 220
 221		dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
 222
 223		ep->data_subs = subs;
 224		err = snd_usb_endpoint_start(ep);
 225		if (err < 0) {
 226			clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
 227			return err;
 228		}
 229	}
 230
 231	if (subs->sync_endpoint &&
 232	    !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
 233		struct snd_usb_endpoint *ep = subs->sync_endpoint;
 234
 235		if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
 236		    subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
 237			err = usb_set_interface(subs->dev,
 238						subs->sync_endpoint->iface,
 239						subs->sync_endpoint->altsetting);
 240			if (err < 0) {
 241				clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 242				dev_err(&subs->dev->dev,
 243					   "%d:%d: cannot set interface (%d)\n",
 244					   subs->sync_endpoint->iface,
 245					   subs->sync_endpoint->altsetting, err);
 246				return -EIO;
 247			}
 248		}
 249
 250		dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
 251
 252		ep->sync_slave = subs->data_endpoint;
 253		err = snd_usb_endpoint_start(ep);
 254		if (err < 0) {
 255			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
 256			return err;
 257		}
 258	}
 259
 260	return 0;
 261}
 262
 263static void sync_pending_stops(struct snd_usb_substream *subs)
 264{
 265	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
 266	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 267}
 268
 269static void stop_endpoints(struct snd_usb_substream *subs)
 270{
 271	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
 272		snd_usb_endpoint_stop(subs->sync_endpoint);
 273
 274	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
 275		snd_usb_endpoint_stop(subs->data_endpoint);
 276}
 277
 278/* PCM sync_stop callback */
 279static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 280{
 281	struct snd_usb_substream *subs = substream->runtime->private_data;
 282
 283	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 284		sync_pending_stops(subs);
 285		snd_usb_unlock_shutdown(subs->stream->chip);
 286	}
 287	return 0;
 288}
 289
 290static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
 291				     unsigned int altsetting,
 292				     struct usb_host_interface **alts,
 293				     unsigned int *ep)
 294{
 295	struct usb_interface *iface;
 296	struct usb_interface_descriptor *altsd;
 297	struct usb_endpoint_descriptor *epd;
 298
 299	iface = usb_ifnum_to_if(dev, ifnum);
 300	if (!iface || iface->num_altsetting < altsetting + 1)
 301		return -ENOENT;
 302	*alts = &iface->altsetting[altsetting];
 303	altsd = get_iface_desc(*alts);
 304	if (altsd->bAlternateSetting != altsetting ||
 305	    altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
 306	    (altsd->bInterfaceSubClass != 2 &&
 307	     altsd->bInterfaceProtocol != 2   ) ||
 308	    altsd->bNumEndpoints < 1)
 309		return -ENOENT;
 310	epd = get_endpoint(*alts, 0);
 311	if (!usb_endpoint_is_isoc_in(epd) ||
 312	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
 313					USB_ENDPOINT_USAGE_IMPLICIT_FB)
 314		return -ENOENT;
 315	*ep = epd->bEndpointAddress;
 316	return 0;
 317}
 318
 319/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
 320 * applies. Returns 1 if a quirk was found.
 321 */
 322static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
 323					 struct usb_device *dev,
 324					 struct usb_interface_descriptor *altsd,
 325					 unsigned int attr)
 326{
 327	struct usb_host_interface *alts;
 328	struct usb_interface *iface;
 329	unsigned int ep;
 330	unsigned int ifnum;
 331
 332	/* Implicit feedback sync EPs consumers are always playback EPs */
 333	if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
 334		return 0;
 335
 336	switch (subs->stream->chip->usb_id) {
 337	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 338	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 339		ep = 0x81;
 340		ifnum = 3;
 341		goto add_sync_ep_from_ifnum;
 
 
 
 
 
 
 342	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
 343	case USB_ID(0x0763, 0x2081):
 344		ep = 0x81;
 345		ifnum = 2;
 346		goto add_sync_ep_from_ifnum;
 347	case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
 348		ep = 0x86;
 349		ifnum = 2;
 350		goto add_sync_ep_from_ifnum;
 351	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
 352		ep = 0x81;
 353		ifnum = 2;
 354		goto add_sync_ep_from_ifnum;
 355	case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
 356	case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
 357		ep = 0x81;
 358		ifnum = 1;
 359		goto add_sync_ep_from_ifnum;
 360	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
 361		/* MicroBook IIc */
 362		if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
 363			return 0;
 364
 365		/* MicroBook II */
 366		ep = 0x84;
 367		ifnum = 0;
 368		goto add_sync_ep_from_ifnum;
 369	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
 370	case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
 371	case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
 372	case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
 373	case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
 374		ep = 0x81;
 375		ifnum = 2;
 376		goto add_sync_ep_from_ifnum;
 377	case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
 378	case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
 379		ep = 0x82;
 380		ifnum = 0;
 381		goto add_sync_ep_from_ifnum;
 382	case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
 383		/* BOSS Katana amplifiers do not need quirks */
 384		return 0;
 385	}
 386
 
 
 
 387	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
 388	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
 389	    altsd->bInterfaceProtocol == 2 &&
 390	    altsd->bNumEndpoints == 1 &&
 391	    USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
 392	    search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
 393				      altsd->bAlternateSetting,
 394				      &alts, &ep) >= 0) {
 395		goto add_sync_ep;
 396	}
 397
 398	/* No quirk */
 399	return 0;
 400
 401add_sync_ep_from_ifnum:
 402	iface = usb_ifnum_to_if(dev, ifnum);
 403
 404	if (!iface || iface->num_altsetting < 2)
 405		return -EINVAL;
 406
 407	alts = &iface->altsetting[1];
 408
 409add_sync_ep:
 410	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 411						   alts, ep, !subs->direction,
 412						   SND_USB_ENDPOINT_TYPE_DATA);
 413	if (!subs->sync_endpoint)
 414		return -EINVAL;
 415
 416	subs->sync_endpoint->is_implicit_feedback = 1;
 417
 418	subs->data_endpoint->sync_master = subs->sync_endpoint;
 419
 420	return 1;
 421}
 422
 423static int set_sync_endpoint(struct snd_usb_substream *subs,
 424			     struct audioformat *fmt,
 425			     struct usb_device *dev,
 426			     struct usb_host_interface *alts,
 427			     struct usb_interface_descriptor *altsd)
 428{
 429	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 430	unsigned int ep, attr;
 431	bool implicit_fb;
 432	int err;
 433
 434	/* we need a sync pipe in async OUT or adaptive IN mode */
 435	/* check the number of EP, since some devices have broken
 436	 * descriptors which fool us.  if it has only one EP,
 437	 * assume it as adaptive-out or sync-in.
 438	 */
 439	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 440
 441	if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
 442		(!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
 443
 444		/*
 445		 * In these modes the notion of sync_endpoint is irrelevant.
 446		 * Reset pointers to avoid using stale data from previously
 447		 * used settings, e.g. when configuration and endpoints were
 448		 * changed
 449		 */
 450
 451		subs->sync_endpoint = NULL;
 452		subs->data_endpoint->sync_master = NULL;
 453	}
 454
 455	err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
 456	if (err < 0)
 457		return err;
 458
 459	/* endpoint set by quirk */
 460	if (err > 0)
 461		return 0;
 462
 463	if (altsd->bNumEndpoints < 2)
 464		return 0;
 465
 466	if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 467			     attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 468	    (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 469		return 0;
 470
 471	/*
 472	 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 473	 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
 474	 * error fall back to SYNC mode and don't create sync endpoint
 475	 */
 476
 477	/* check sync-pipe endpoint */
 478	/* ... and check descriptor size before accessing bSynchAddress
 479	   because there is a version of the SB Audigy 2 NX firmware lacking
 480	   the audio fields in the endpoint descriptors */
 481	if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 482	    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 483	     get_endpoint(alts, 1)->bSynchAddress != 0)) {
 484		dev_err(&dev->dev,
 485			"%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
 486			   fmt->iface, fmt->altsetting,
 487			   get_endpoint(alts, 1)->bmAttributes,
 488			   get_endpoint(alts, 1)->bLength,
 489			   get_endpoint(alts, 1)->bSynchAddress);
 490		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 491			return 0;
 492		return -EINVAL;
 493	}
 494	ep = get_endpoint(alts, 1)->bEndpointAddress;
 495	if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 496	    get_endpoint(alts, 0)->bSynchAddress != 0 &&
 497	    ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 498	     (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 499		dev_err(&dev->dev,
 500			"%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
 501			   fmt->iface, fmt->altsetting,
 502			   is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
 503		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 504			return 0;
 505		return -EINVAL;
 506	}
 507
 508	implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
 509			== USB_ENDPOINT_USAGE_IMPLICIT_FB;
 510
 511	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 512						   alts, ep, !subs->direction,
 513						   implicit_fb ?
 514							SND_USB_ENDPOINT_TYPE_DATA :
 515							SND_USB_ENDPOINT_TYPE_SYNC);
 516
 517	if (!subs->sync_endpoint) {
 518		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
 519			return 0;
 520		return -EINVAL;
 521	}
 522
 523	subs->sync_endpoint->is_implicit_feedback = implicit_fb;
 524
 525	subs->data_endpoint->sync_master = subs->sync_endpoint;
 526
 527	return 0;
 528}
 529
 530/*
 531 * find a matching format and set up the interface
 532 */
 533static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 534{
 535	struct usb_device *dev = subs->dev;
 536	struct usb_host_interface *alts;
 537	struct usb_interface_descriptor *altsd;
 538	struct usb_interface *iface;
 539	int err;
 540
 541	iface = usb_ifnum_to_if(dev, fmt->iface);
 542	if (WARN_ON(!iface))
 543		return -EINVAL;
 544	alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
 545	if (WARN_ON(!alts))
 546		return -EINVAL;
 547	altsd = get_iface_desc(alts);
 
 
 548
 549	if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
 550		return 0;
 551
 552	/* close the old interface */
 553	if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
 554		if (!subs->stream->chip->keep_iface) {
 555			err = usb_set_interface(subs->dev, subs->interface, 0);
 556			if (err < 0) {
 557				dev_err(&dev->dev,
 558					"%d:%d: return to setting 0 failed (%d)\n",
 559					fmt->iface, fmt->altsetting, err);
 560				return -EIO;
 561			}
 562		}
 563		subs->interface = -1;
 564		subs->altset_idx = 0;
 565	}
 566
 567	if (subs->need_setup_fmt)
 568		subs->need_setup_fmt = false;
 569
 570	/* set interface */
 571	if (iface->cur_altsetting != alts) {
 
 
 572		err = snd_usb_select_mode_quirk(subs, fmt);
 573		if (err < 0)
 574			return -EIO;
 575
 576		err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
 577		if (err < 0) {
 578			dev_err(&dev->dev,
 579				"%d:%d: usb_set_interface failed (%d)\n",
 580				fmt->iface, fmt->altsetting, err);
 581			return -EIO;
 582		}
 583		dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
 584			fmt->iface, fmt->altsetting);
 
 
 
 585		snd_usb_set_interface_quirk(dev);
 586	}
 587
 588	subs->interface = fmt->iface;
 589	subs->altset_idx = fmt->altset_idx;
 590	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
 591						   alts, fmt->endpoint, subs->direction,
 592						   SND_USB_ENDPOINT_TYPE_DATA);
 593
 594	if (!subs->data_endpoint)
 595		return -EINVAL;
 596
 597	err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
 598	if (err < 0)
 599		return err;
 600
 601	err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
 602	if (err < 0)
 603		return err;
 604
 605	subs->cur_audiofmt = fmt;
 606
 607	snd_usb_set_format_quirk(subs, fmt);
 608
 609	return 0;
 610}
 611
 612/*
 613 * Return the score of matching two audioformats.
 614 * Veto the audioformat if:
 615 * - It has no channels for some reason.
 616 * - Requested PCM format is not supported.
 617 * - Requested sample rate is not supported.
 618 */
 619static int match_endpoint_audioformats(struct snd_usb_substream *subs,
 620				       struct audioformat *fp,
 621				       struct audioformat *match, int rate,
 622				       snd_pcm_format_t pcm_format)
 623{
 624	int i;
 625	int score = 0;
 626
 627	if (fp->channels < 1) {
 628		dev_dbg(&subs->dev->dev,
 629			"%s: (fmt @%p) no channels\n", __func__, fp);
 630		return 0;
 631	}
 632
 633	if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
 634		dev_dbg(&subs->dev->dev,
 635			"%s: (fmt @%p) no match for format %d\n", __func__,
 636			fp, pcm_format);
 637		return 0;
 638	}
 639
 640	for (i = 0; i < fp->nr_rates; i++) {
 641		if (fp->rate_table[i] == rate) {
 642			score++;
 643			break;
 644		}
 645	}
 646	if (!score) {
 647		dev_dbg(&subs->dev->dev,
 648			"%s: (fmt @%p) no match for rate %d\n", __func__,
 649			fp, rate);
 650		return 0;
 651	}
 652
 653	if (fp->channels == match->channels)
 654		score++;
 655
 656	dev_dbg(&subs->dev->dev,
 657		"%s: (fmt @%p) score %d\n", __func__, fp, score);
 658
 659	return score;
 660}
 661
 662/*
 663 * Configure the sync ep using the rate and pcm format of the data ep.
 664 */
 665static int configure_sync_endpoint(struct snd_usb_substream *subs)
 666{
 667	int ret;
 668	struct audioformat *fp;
 669	struct audioformat *sync_fp = NULL;
 670	int cur_score = 0;
 671	int sync_period_bytes = subs->period_bytes;
 672	struct snd_usb_substream *sync_subs =
 673		&subs->stream->substream[subs->direction ^ 1];
 674
 675	if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
 676	    !subs->stream)
 677		return snd_usb_endpoint_set_params(subs->sync_endpoint,
 678						   subs->pcm_format,
 679						   subs->channels,
 680						   subs->period_bytes,
 681						   0, 0,
 682						   subs->cur_rate,
 683						   subs->cur_audiofmt,
 684						   NULL);
 685
 686	/* Try to find the best matching audioformat. */
 687	list_for_each_entry(fp, &sync_subs->fmt_list, list) {
 688		int score = match_endpoint_audioformats(subs,
 689							fp, subs->cur_audiofmt,
 690			subs->cur_rate, subs->pcm_format);
 691
 692		if (score > cur_score) {
 693			sync_fp = fp;
 694			cur_score = score;
 695		}
 696	}
 697
 698	if (unlikely(sync_fp == NULL)) {
 699		dev_err(&subs->dev->dev,
 700			"%s: no valid audioformat for sync ep %x found\n",
 701			__func__, sync_subs->ep_num);
 702		return -EINVAL;
 703	}
 704
 705	/*
 706	 * Recalculate the period bytes if channel number differ between
 707	 * data and sync ep audioformat.
 708	 */
 709	if (sync_fp->channels != subs->channels) {
 710		sync_period_bytes = (subs->period_bytes / subs->channels) *
 711			sync_fp->channels;
 712		dev_dbg(&subs->dev->dev,
 713			"%s: adjusted sync ep period bytes (%d -> %d)\n",
 714			__func__, subs->period_bytes, sync_period_bytes);
 715	}
 716
 717	ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
 718					  subs->pcm_format,
 719					  sync_fp->channels,
 720					  sync_period_bytes,
 721					  0, 0,
 722					  subs->cur_rate,
 723					  sync_fp,
 724					  NULL);
 725
 726	return ret;
 727}
 728
 729/*
 730 * configure endpoint params
 731 *
 732 * called  during initial setup and upon resume
 733 */
 734static int configure_endpoint(struct snd_usb_substream *subs)
 735{
 736	int ret;
 737
 738	/* format changed */
 739	stop_endpoints(subs);
 740	sync_pending_stops(subs);
 741	ret = snd_usb_endpoint_set_params(subs->data_endpoint,
 742					  subs->pcm_format,
 743					  subs->channels,
 744					  subs->period_bytes,
 745					  subs->period_frames,
 746					  subs->buffer_periods,
 747					  subs->cur_rate,
 748					  subs->cur_audiofmt,
 749					  subs->sync_endpoint);
 750	if (ret < 0)
 751		return ret;
 752
 753	if (subs->sync_endpoint)
 754		ret = configure_sync_endpoint(subs);
 755
 756	return ret;
 757}
 758
 759static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 760{
 761	int ret;
 762
 763	if (!subs->str_pd)
 764		return 0;
 765
 766	ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
 767	if (ret < 0) {
 768		dev_err(&subs->dev->dev,
 769			"Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
 770			subs->str_pd->pd_id, state, ret);
 771		return ret;
 772	}
 773
 774	return 0;
 775}
 776
 777int snd_usb_pcm_suspend(struct snd_usb_stream *as)
 778{
 779	int ret;
 780
 781	ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
 782	if (ret < 0)
 783		return ret;
 784
 785	ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
 786	if (ret < 0)
 787		return ret;
 788
 789	return 0;
 790}
 791
 792int snd_usb_pcm_resume(struct snd_usb_stream *as)
 793{
 794	int ret;
 795
 796	ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
 797	if (ret < 0)
 798		return ret;
 799
 800	ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
 801	if (ret < 0)
 802		return ret;
 803
 804	return 0;
 805}
 806
 807/*
 808 * hw_params callback
 809 *
 810 * allocate a buffer and set the given audio format.
 811 *
 812 * so far we use a physically linear buffer although packetize transfer
 813 * doesn't need a continuous area.
 814 * if sg buffer is supported on the later version of alsa, we'll follow
 815 * that.
 816 */
 817static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 818			     struct snd_pcm_hw_params *hw_params)
 819{
 820	struct snd_usb_substream *subs = substream->runtime->private_data;
 821	struct audioformat *fmt;
 822	int ret;
 823
 824	ret = snd_media_start_pipeline(subs);
 825	if (ret)
 
 826		return ret;
 827
 828	subs->pcm_format = params_format(hw_params);
 829	subs->period_bytes = params_period_bytes(hw_params);
 830	subs->period_frames = params_period_size(hw_params);
 831	subs->buffer_periods = params_periods(hw_params);
 832	subs->channels = params_channels(hw_params);
 833	subs->cur_rate = params_rate(hw_params);
 834
 835	fmt = find_format(subs);
 836	if (!fmt) {
 837		dev_dbg(&subs->dev->dev,
 838			"cannot set format: format = %#x, rate = %d, channels = %d\n",
 839			   subs->pcm_format, subs->cur_rate, subs->channels);
 840		ret = -EINVAL;
 841		goto stop_pipeline;
 842	}
 843
 844	ret = snd_usb_lock_shutdown(subs->stream->chip);
 845	if (ret < 0)
 846		goto stop_pipeline;
 847
 848	ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 849	if (ret < 0)
 850		goto unlock;
 851
 852	ret = set_format(subs, fmt);
 
 853	if (ret < 0)
 854		goto unlock;
 855
 856	subs->interface = fmt->iface;
 857	subs->altset_idx = fmt->altset_idx;
 858	subs->need_setup_ep = true;
 859
 860 unlock:
 861	snd_usb_unlock_shutdown(subs->stream->chip);
 862	if (ret < 0)
 863		goto stop_pipeline;
 864	return ret;
 865
 866 stop_pipeline:
 867	snd_media_stop_pipeline(subs);
 868	return ret;
 869}
 870
 871/*
 872 * hw_free callback
 873 *
 874 * reset the audio format and release the buffer
 875 */
 876static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 877{
 878	struct snd_usb_substream *subs = substream->runtime->private_data;
 879
 880	snd_media_stop_pipeline(subs);
 881	subs->cur_audiofmt = NULL;
 882	subs->cur_rate = 0;
 883	subs->period_bytes = 0;
 884	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 885		stop_endpoints(subs);
 886		sync_pending_stops(subs);
 887		snd_usb_endpoint_deactivate(subs->sync_endpoint);
 888		snd_usb_endpoint_deactivate(subs->data_endpoint);
 889		snd_usb_unlock_shutdown(subs->stream->chip);
 890	}
 891
 892	return 0;
 893}
 894
 895/*
 896 * prepare callback
 897 *
 898 * only a few subtle things...
 899 */
 900static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 901{
 902	struct snd_pcm_runtime *runtime = substream->runtime;
 903	struct snd_usb_substream *subs = runtime->private_data;
 904	struct usb_host_interface *alts;
 905	struct usb_interface *iface;
 906	int ret;
 907
 908	if (! subs->cur_audiofmt) {
 909		dev_err(&subs->dev->dev, "no format is specified!\n");
 910		return -ENXIO;
 911	}
 912
 913	ret = snd_usb_lock_shutdown(subs->stream->chip);
 914	if (ret < 0)
 915		return ret;
 916	if (snd_BUG_ON(!subs->data_endpoint)) {
 917		ret = -EIO;
 918		goto unlock;
 919	}
 920
 921	ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
 
 
 
 922	if (ret < 0)
 923		goto unlock;
 924
 925	ret = set_format(subs, subs->cur_audiofmt);
 
 
 
 
 
 
 926	if (ret < 0)
 927		goto unlock;
 928
 929	if (subs->need_setup_ep) {
 930
 931		iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
 932		alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
 933		ret = snd_usb_init_sample_rate(subs->stream->chip,
 934					       subs->cur_audiofmt->iface,
 935					       alts,
 936					       subs->cur_audiofmt,
 937					       subs->cur_rate);
 938		if (ret < 0)
 939			goto unlock;
 940
 941		ret = configure_endpoint(subs);
 942		if (ret < 0)
 943			goto unlock;
 944		subs->need_setup_ep = false;
 945	}
 946
 947	/* some unit conversions in runtime */
 948	subs->data_endpoint->maxframesize =
 949		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
 950	subs->data_endpoint->curframesize =
 951		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
 952
 953	/* reset the pointer */
 954	subs->hwptr_done = 0;
 955	subs->transfer_done = 0;
 956	subs->last_delay = 0;
 957	subs->last_frame_number = 0;
 958	runtime->delay = 0;
 959
 960	/* for playback, submit the URBs now; otherwise, the first hwptr_done
 961	 * updates for all URBs would happen at the same time when starting */
 962	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
 963		ret = start_endpoints(subs);
 964
 965 unlock:
 966	snd_usb_unlock_shutdown(subs->stream->chip);
 967	return ret;
 968}
 969
 970static const struct snd_pcm_hardware snd_usb_hardware =
 971{
 972	.info =			SNDRV_PCM_INFO_MMAP |
 973				SNDRV_PCM_INFO_MMAP_VALID |
 974				SNDRV_PCM_INFO_BATCH |
 975				SNDRV_PCM_INFO_INTERLEAVED |
 976				SNDRV_PCM_INFO_BLOCK_TRANSFER |
 977				SNDRV_PCM_INFO_PAUSE,
 978	.buffer_bytes_max =	1024 * 1024,
 979	.period_bytes_min =	64,
 980	.period_bytes_max =	512 * 1024,
 981	.periods_min =		2,
 982	.periods_max =		1024,
 983};
 984
 985static int hw_check_valid_format(struct snd_usb_substream *subs,
 986				 struct snd_pcm_hw_params *params,
 987				 struct audioformat *fp)
 988{
 989	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 990	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 991	struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 992	struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 993	struct snd_mask check_fmts;
 994	unsigned int ptime;
 995
 996	/* check the format */
 997	snd_mask_none(&check_fmts);
 998	check_fmts.bits[0] = (u32)fp->formats;
 999	check_fmts.bits[1] = (u32)(fp->formats >> 32);
1000	snd_mask_intersect(&check_fmts, fmts);
1001	if (snd_mask_empty(&check_fmts)) {
1002		hwc_debug("   > check: no supported format %d\n", fp->format);
1003		return 0;
1004	}
1005	/* check the channels */
1006	if (fp->channels < ct->min || fp->channels > ct->max) {
1007		hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1008		return 0;
1009	}
1010	/* check the rate is within the range */
1011	if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1012		hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1013		return 0;
1014	}
1015	if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1016		hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1017		return 0;
1018	}
1019	/* check whether the period time is >= the data packet interval */
1020	if (subs->speed != USB_SPEED_FULL) {
1021		ptime = 125 * (1 << fp->datainterval);
1022		if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1023			hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1024			return 0;
1025		}
1026	}
1027	return 1;
1028}
1029
1030static int hw_rule_rate(struct snd_pcm_hw_params *params,
1031			struct snd_pcm_hw_rule *rule)
1032{
1033	struct snd_usb_substream *subs = rule->private;
1034	struct audioformat *fp;
1035	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1036	unsigned int rmin, rmax;
1037	int changed;
1038
1039	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1040	changed = 0;
1041	rmin = rmax = 0;
1042	list_for_each_entry(fp, &subs->fmt_list, list) {
1043		if (!hw_check_valid_format(subs, params, fp))
1044			continue;
1045		if (changed++) {
1046			if (rmin > fp->rate_min)
1047				rmin = fp->rate_min;
1048			if (rmax < fp->rate_max)
1049				rmax = fp->rate_max;
1050		} else {
1051			rmin = fp->rate_min;
1052			rmax = fp->rate_max;
1053		}
1054	}
1055
1056	if (!changed) {
1057		hwc_debug("  --> get empty\n");
1058		it->empty = 1;
1059		return -EINVAL;
1060	}
1061
1062	changed = 0;
1063	if (it->min < rmin) {
1064		it->min = rmin;
1065		it->openmin = 0;
1066		changed = 1;
1067	}
1068	if (it->max > rmax) {
1069		it->max = rmax;
1070		it->openmax = 0;
1071		changed = 1;
1072	}
1073	if (snd_interval_checkempty(it)) {
1074		it->empty = 1;
1075		return -EINVAL;
1076	}
1077	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1078	return changed;
1079}
1080
1081
1082static int hw_rule_channels(struct snd_pcm_hw_params *params,
1083			    struct snd_pcm_hw_rule *rule)
1084{
1085	struct snd_usb_substream *subs = rule->private;
1086	struct audioformat *fp;
1087	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1088	unsigned int rmin, rmax;
1089	int changed;
1090
1091	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1092	changed = 0;
1093	rmin = rmax = 0;
1094	list_for_each_entry(fp, &subs->fmt_list, list) {
1095		if (!hw_check_valid_format(subs, params, fp))
1096			continue;
1097		if (changed++) {
1098			if (rmin > fp->channels)
1099				rmin = fp->channels;
1100			if (rmax < fp->channels)
1101				rmax = fp->channels;
1102		} else {
1103			rmin = fp->channels;
1104			rmax = fp->channels;
1105		}
1106	}
1107
1108	if (!changed) {
1109		hwc_debug("  --> get empty\n");
1110		it->empty = 1;
1111		return -EINVAL;
1112	}
1113
1114	changed = 0;
1115	if (it->min < rmin) {
1116		it->min = rmin;
1117		it->openmin = 0;
1118		changed = 1;
1119	}
1120	if (it->max > rmax) {
1121		it->max = rmax;
1122		it->openmax = 0;
1123		changed = 1;
1124	}
1125	if (snd_interval_checkempty(it)) {
1126		it->empty = 1;
1127		return -EINVAL;
1128	}
1129	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1130	return changed;
1131}
1132
1133static int hw_rule_format(struct snd_pcm_hw_params *params,
1134			  struct snd_pcm_hw_rule *rule)
1135{
1136	struct snd_usb_substream *subs = rule->private;
1137	struct audioformat *fp;
1138	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1139	u64 fbits;
1140	u32 oldbits[2];
1141	int changed;
1142
1143	hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1144	fbits = 0;
1145	list_for_each_entry(fp, &subs->fmt_list, list) {
1146		if (!hw_check_valid_format(subs, params, fp))
1147			continue;
1148		fbits |= fp->formats;
1149	}
1150
1151	oldbits[0] = fmt->bits[0];
1152	oldbits[1] = fmt->bits[1];
1153	fmt->bits[0] &= (u32)fbits;
1154	fmt->bits[1] &= (u32)(fbits >> 32);
1155	if (!fmt->bits[0] && !fmt->bits[1]) {
1156		hwc_debug("  --> get empty\n");
1157		return -EINVAL;
1158	}
1159	changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1160	hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1161	return changed;
1162}
1163
1164static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1165			       struct snd_pcm_hw_rule *rule)
1166{
1167	struct snd_usb_substream *subs = rule->private;
1168	struct audioformat *fp;
1169	struct snd_interval *it;
1170	unsigned char min_datainterval;
1171	unsigned int pmin;
1172	int changed;
1173
1174	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1175	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1176	min_datainterval = 0xff;
1177	list_for_each_entry(fp, &subs->fmt_list, list) {
1178		if (!hw_check_valid_format(subs, params, fp))
1179			continue;
1180		min_datainterval = min(min_datainterval, fp->datainterval);
1181	}
1182	if (min_datainterval == 0xff) {
1183		hwc_debug("  --> get empty\n");
1184		it->empty = 1;
1185		return -EINVAL;
1186	}
1187	pmin = 125 * (1 << min_datainterval);
1188	changed = 0;
1189	if (it->min < pmin) {
1190		it->min = pmin;
1191		it->openmin = 0;
1192		changed = 1;
1193	}
1194	if (snd_interval_checkempty(it)) {
1195		it->empty = 1;
1196		return -EINVAL;
1197	}
1198	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1199	return changed;
1200}
1201
1202/*
1203 *  If the device supports unusual bit rates, does the request meet these?
1204 */
1205static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1206				  struct snd_usb_substream *subs)
1207{
1208	struct audioformat *fp;
1209	int *rate_list;
1210	int count = 0, needs_knot = 0;
1211	int err;
1212
1213	kfree(subs->rate_list.list);
1214	subs->rate_list.list = NULL;
1215
1216	list_for_each_entry(fp, &subs->fmt_list, list) {
1217		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1218			return 0;
1219		count += fp->nr_rates;
1220		if (fp->rates & SNDRV_PCM_RATE_KNOT)
1221			needs_knot = 1;
1222	}
1223	if (!needs_knot)
1224		return 0;
1225
1226	subs->rate_list.list = rate_list =
1227		kmalloc_array(count, sizeof(int), GFP_KERNEL);
1228	if (!subs->rate_list.list)
1229		return -ENOMEM;
1230	subs->rate_list.count = count;
1231	subs->rate_list.mask = 0;
1232	count = 0;
1233	list_for_each_entry(fp, &subs->fmt_list, list) {
1234		int i;
1235		for (i = 0; i < fp->nr_rates; i++)
1236			rate_list[count++] = fp->rate_table[i];
1237	}
1238	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1239					 &subs->rate_list);
1240	if (err < 0)
1241		return err;
1242
1243	return 0;
1244}
1245
1246
1247/*
1248 * set up the runtime hardware information.
1249 */
1250
1251static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1252{
1253	struct audioformat *fp;
1254	unsigned int pt, ptmin;
1255	int param_period_time_if_needed;
1256	int err;
1257
1258	runtime->hw.formats = subs->formats;
1259
1260	runtime->hw.rate_min = 0x7fffffff;
1261	runtime->hw.rate_max = 0;
1262	runtime->hw.channels_min = 256;
1263	runtime->hw.channels_max = 0;
1264	runtime->hw.rates = 0;
1265	ptmin = UINT_MAX;
1266	/* check min/max rates and channels */
1267	list_for_each_entry(fp, &subs->fmt_list, list) {
1268		runtime->hw.rates |= fp->rates;
1269		if (runtime->hw.rate_min > fp->rate_min)
1270			runtime->hw.rate_min = fp->rate_min;
1271		if (runtime->hw.rate_max < fp->rate_max)
1272			runtime->hw.rate_max = fp->rate_max;
1273		if (runtime->hw.channels_min > fp->channels)
1274			runtime->hw.channels_min = fp->channels;
1275		if (runtime->hw.channels_max < fp->channels)
1276			runtime->hw.channels_max = fp->channels;
1277		if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
1278			/* FIXME: there might be more than one audio formats... */
1279			runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1280				fp->frame_size;
1281		}
1282		pt = 125 * (1 << fp->datainterval);
1283		ptmin = min(ptmin, pt);
1284	}
 
 
 
1285
1286	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1287	if (subs->speed == USB_SPEED_FULL)
1288		/* full speed devices have fixed data packet interval */
1289		ptmin = 1000;
1290	if (ptmin == 1000)
1291		/* if period time doesn't go below 1 ms, no rules needed */
1292		param_period_time_if_needed = -1;
 
 
1293
1294	err = snd_pcm_hw_constraint_minmax(runtime,
1295					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1296					   ptmin, UINT_MAX);
1297	if (err < 0)
1298		return err;
1299
1300	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1301				  hw_rule_rate, subs,
1302				  SNDRV_PCM_HW_PARAM_FORMAT,
1303				  SNDRV_PCM_HW_PARAM_CHANNELS,
1304				  param_period_time_if_needed,
1305				  -1);
1306	if (err < 0)
1307		return err;
1308	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1309				  hw_rule_channels, subs,
1310				  SNDRV_PCM_HW_PARAM_FORMAT,
1311				  SNDRV_PCM_HW_PARAM_RATE,
1312				  param_period_time_if_needed,
1313				  -1);
1314	if (err < 0)
1315		return err;
1316	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1317				  hw_rule_format, subs,
1318				  SNDRV_PCM_HW_PARAM_RATE,
1319				  SNDRV_PCM_HW_PARAM_CHANNELS,
1320				  param_period_time_if_needed,
1321				  -1);
1322	if (err < 0)
1323		return err;
1324	if (param_period_time_if_needed >= 0) {
1325		err = snd_pcm_hw_rule_add(runtime, 0,
1326					  SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1327					  hw_rule_period_time, subs,
1328					  SNDRV_PCM_HW_PARAM_FORMAT,
1329					  SNDRV_PCM_HW_PARAM_CHANNELS,
1330					  SNDRV_PCM_HW_PARAM_RATE,
1331					  -1);
1332		if (err < 0)
1333			return err;
1334	}
1335	err = snd_usb_pcm_check_knot(runtime, subs);
1336	if (err < 0)
1337		return err;
1338
1339	return snd_usb_autoresume(subs->stream->chip);
 
 
1340}
1341
1342static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
1343{
1344	int direction = substream->stream;
1345	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1346	struct snd_pcm_runtime *runtime = substream->runtime;
1347	struct snd_usb_substream *subs = &as->substream[direction];
1348	int ret;
1349
1350	subs->interface = -1;
1351	subs->altset_idx = 0;
1352	runtime->hw = snd_usb_hardware;
1353	runtime->private_data = subs;
1354	subs->pcm_substream = substream;
1355	/* runtime PM is also done there */
1356
1357	/* initialize DSD/DOP context */
1358	subs->dsd_dop.byte_idx = 0;
1359	subs->dsd_dop.channel = 0;
1360	subs->dsd_dop.marker = 1;
1361
1362	ret = setup_hw_info(runtime, subs);
1363	if (ret == 0) {
1364		ret = snd_media_stream_init(subs, as->pcm, direction);
1365		if (ret)
1366			snd_usb_autosuspend(subs->stream->chip);
1367	}
1368	return ret;
1369}
1370
1371static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
1372{
1373	int direction = substream->stream;
1374	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1375	struct snd_usb_substream *subs = &as->substream[direction];
1376	int ret;
1377
1378	snd_media_stop_pipeline(subs);
1379
1380	if (!as->chip->keep_iface &&
1381	    subs->interface >= 0 &&
1382	    !snd_usb_lock_shutdown(subs->stream->chip)) {
1383		usb_set_interface(subs->dev, subs->interface, 0);
1384		subs->interface = -1;
1385		ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
1386		snd_usb_unlock_shutdown(subs->stream->chip);
1387		if (ret < 0)
1388			return ret;
1389	}
1390
1391	subs->pcm_substream = NULL;
1392	snd_usb_autosuspend(subs->stream->chip);
1393
1394	return 0;
1395}
1396
1397/* Since a URB can handle only a single linear buffer, we must use double
1398 * buffering when the data to be transferred overflows the buffer boundary.
1399 * To avoid inconsistencies when updating hwptr_done, we use double buffering
1400 * for all URBs.
1401 */
1402static void retire_capture_urb(struct snd_usb_substream *subs,
1403			       struct urb *urb)
1404{
1405	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1406	unsigned int stride, frames, bytes, oldptr;
1407	int i, period_elapsed = 0;
1408	unsigned long flags;
1409	unsigned char *cp;
1410	int current_frame_number;
1411
1412	/* read frame number here, update pointer in critical section */
1413	current_frame_number = usb_get_current_frame_number(subs->dev);
1414
1415	stride = runtime->frame_bits >> 3;
1416
1417	for (i = 0; i < urb->number_of_packets; i++) {
1418		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1419		if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
1420			dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
1421				i, urb->iso_frame_desc[i].status);
1422			// continue;
1423		}
1424		bytes = urb->iso_frame_desc[i].actual_length;
1425		if (subs->stream_offset_adj > 0) {
1426			unsigned int adj = min(subs->stream_offset_adj, bytes);
1427			cp += adj;
1428			bytes -= adj;
1429			subs->stream_offset_adj -= adj;
1430		}
1431		frames = bytes / stride;
1432		if (!subs->txfr_quirk)
1433			bytes = frames * stride;
1434		if (bytes % (runtime->sample_bits >> 3) != 0) {
1435			int oldbytes = bytes;
1436			bytes = frames * stride;
1437			dev_warn_ratelimited(&subs->dev->dev,
1438				 "Corrected urb data len. %d->%d\n",
1439							oldbytes, bytes);
1440		}
1441		/* update the current pointer */
1442		spin_lock_irqsave(&subs->lock, flags);
1443		oldptr = subs->hwptr_done;
1444		subs->hwptr_done += bytes;
1445		if (subs->hwptr_done >= runtime->buffer_size * stride)
1446			subs->hwptr_done -= runtime->buffer_size * stride;
1447		frames = (bytes + (oldptr % stride)) / stride;
1448		subs->transfer_done += frames;
1449		if (subs->transfer_done >= runtime->period_size) {
1450			subs->transfer_done -= runtime->period_size;
1451			period_elapsed = 1;
1452		}
1453		/* capture delay is by construction limited to one URB,
1454		 * reset delays here
1455		 */
1456		runtime->delay = subs->last_delay = 0;
1457
1458		/* realign last_frame_number */
1459		subs->last_frame_number = current_frame_number;
1460		subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1461
1462		spin_unlock_irqrestore(&subs->lock, flags);
1463		/* copy a data chunk */
1464		if (oldptr + bytes > runtime->buffer_size * stride) {
1465			unsigned int bytes1 =
1466					runtime->buffer_size * stride - oldptr;
1467			memcpy(runtime->dma_area + oldptr, cp, bytes1);
1468			memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
1469		} else {
1470			memcpy(runtime->dma_area + oldptr, cp, bytes);
1471		}
1472	}
1473
1474	if (period_elapsed)
1475		snd_pcm_period_elapsed(subs->pcm_substream);
1476}
1477
1478static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
1479					     struct urb *urb, unsigned int bytes)
1480{
1481	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1482	unsigned int stride = runtime->frame_bits >> 3;
1483	unsigned int dst_idx = 0;
1484	unsigned int src_idx = subs->hwptr_done;
1485	unsigned int wrap = runtime->buffer_size * stride;
1486	u8 *dst = urb->transfer_buffer;
1487	u8 *src = runtime->dma_area;
1488	u8 marker[] = { 0x05, 0xfa };
1489
1490	/*
1491	 * The DSP DOP format defines a way to transport DSD samples over
1492	 * normal PCM data endpoints. It requires stuffing of marker bytes
1493	 * (0x05 and 0xfa, alternating per sample frame), and then expects
1494	 * 2 additional bytes of actual payload. The whole frame is stored
1495	 * LSB.
1496	 *
1497	 * Hence, for a stereo transport, the buffer layout looks like this,
1498	 * where L refers to left channel samples and R to right.
1499	 *
1500	 *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
1501	 *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
1502	 *   .....
1503	 *
1504	 */
1505
1506	while (bytes--) {
1507		if (++subs->dsd_dop.byte_idx == 3) {
1508			/* frame boundary? */
1509			dst[dst_idx++] = marker[subs->dsd_dop.marker];
1510			src_idx += 2;
1511			subs->dsd_dop.byte_idx = 0;
1512
1513			if (++subs->dsd_dop.channel % runtime->channels == 0) {
1514				/* alternate the marker */
1515				subs->dsd_dop.marker++;
1516				subs->dsd_dop.marker %= ARRAY_SIZE(marker);
1517				subs->dsd_dop.channel = 0;
1518			}
1519		} else {
1520			/* stuff the DSD payload */
1521			int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1522
1523			if (subs->cur_audiofmt->dsd_bitrev)
1524				dst[dst_idx++] = bitrev8(src[idx]);
1525			else
1526				dst[dst_idx++] = src[idx];
1527
1528			subs->hwptr_done++;
1529		}
1530	}
1531	if (subs->hwptr_done >= runtime->buffer_size * stride)
1532		subs->hwptr_done -= runtime->buffer_size * stride;
1533}
1534
1535static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
1536			int offset, int stride, unsigned int bytes)
1537{
1538	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1539
1540	if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
1541		/* err, the transferred area goes over buffer boundary. */
1542		unsigned int bytes1 =
1543			runtime->buffer_size * stride - subs->hwptr_done;
1544		memcpy(urb->transfer_buffer + offset,
1545		       runtime->dma_area + subs->hwptr_done, bytes1);
1546		memcpy(urb->transfer_buffer + offset + bytes1,
1547		       runtime->dma_area, bytes - bytes1);
1548	} else {
1549		memcpy(urb->transfer_buffer + offset,
1550		       runtime->dma_area + subs->hwptr_done, bytes);
1551	}
1552	subs->hwptr_done += bytes;
1553	if (subs->hwptr_done >= runtime->buffer_size * stride)
1554		subs->hwptr_done -= runtime->buffer_size * stride;
1555}
1556
1557static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
1558				      struct urb *urb, int stride,
1559				      unsigned int bytes)
1560{
1561	__le32 packet_length;
1562	int i;
1563
1564	/* Put __le32 length descriptor at start of each packet. */
1565	for (i = 0; i < urb->number_of_packets; i++) {
1566		unsigned int length = urb->iso_frame_desc[i].length;
1567		unsigned int offset = urb->iso_frame_desc[i].offset;
1568
1569		packet_length = cpu_to_le32(length);
1570		offset += i * sizeof(packet_length);
1571		urb->iso_frame_desc[i].offset = offset;
1572		urb->iso_frame_desc[i].length += sizeof(packet_length);
1573		memcpy(urb->transfer_buffer + offset,
1574		       &packet_length, sizeof(packet_length));
1575		copy_to_urb(subs, urb, offset + sizeof(packet_length),
1576			    stride, length);
1577	}
1578	/* Adjust transfer size accordingly. */
1579	bytes += urb->number_of_packets * sizeof(packet_length);
1580	return bytes;
1581}
1582
1583static void prepare_playback_urb(struct snd_usb_substream *subs,
1584				 struct urb *urb)
1585{
1586	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1587	struct snd_usb_endpoint *ep = subs->data_endpoint;
1588	struct snd_urb_ctx *ctx = urb->context;
1589	unsigned int counts, frames, bytes;
1590	int i, stride, period_elapsed = 0;
1591	unsigned long flags;
1592
1593	stride = runtime->frame_bits >> 3;
1594
1595	frames = 0;
1596	urb->number_of_packets = 0;
1597	spin_lock_irqsave(&subs->lock, flags);
1598	subs->frame_limit += ep->max_urb_frames;
1599	for (i = 0; i < ctx->packets; i++) {
1600		if (ctx->packet_size[i])
1601			counts = ctx->packet_size[i];
1602		else if (ep->sync_master)
1603			counts = snd_usb_endpoint_slave_next_packet_size(ep);
1604		else
1605			counts = snd_usb_endpoint_next_packet_size(ep);
1606
1607		/* set up descriptor */
1608		urb->iso_frame_desc[i].offset = frames * ep->stride;
1609		urb->iso_frame_desc[i].length = counts * ep->stride;
1610		frames += counts;
1611		urb->number_of_packets++;
1612		subs->transfer_done += counts;
1613		if (subs->transfer_done >= runtime->period_size) {
1614			subs->transfer_done -= runtime->period_size;
1615			subs->frame_limit = 0;
1616			period_elapsed = 1;
1617			if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
1618				if (subs->transfer_done > 0) {
1619					/* FIXME: fill-max mode is not
1620					 * supported yet */
1621					frames -= subs->transfer_done;
1622					counts -= subs->transfer_done;
1623					urb->iso_frame_desc[i].length =
1624						counts * ep->stride;
1625					subs->transfer_done = 0;
1626				}
1627				i++;
1628				if (i < ctx->packets) {
1629					/* add a transfer delimiter */
1630					urb->iso_frame_desc[i].offset =
1631						frames * ep->stride;
1632					urb->iso_frame_desc[i].length = 0;
1633					urb->number_of_packets++;
1634				}
1635				break;
1636			}
1637		}
1638		/* finish at the period boundary or after enough frames */
1639		if ((period_elapsed ||
1640				subs->transfer_done >= subs->frame_limit) &&
1641		    !snd_usb_endpoint_implicit_feedback_sink(ep))
1642			break;
1643	}
1644	bytes = frames * ep->stride;
1645
1646	if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
1647		     subs->cur_audiofmt->dsd_dop)) {
1648		fill_playback_urb_dsd_dop(subs, urb, bytes);
1649	} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
1650			   subs->cur_audiofmt->dsd_bitrev)) {
1651		/* bit-reverse the bytes */
1652		u8 *buf = urb->transfer_buffer;
1653		for (i = 0; i < bytes; i++) {
1654			int idx = (subs->hwptr_done + i)
1655				% (runtime->buffer_size * stride);
1656			buf[i] = bitrev8(runtime->dma_area[idx]);
1657		}
1658
1659		subs->hwptr_done += bytes;
1660		if (subs->hwptr_done >= runtime->buffer_size * stride)
1661			subs->hwptr_done -= runtime->buffer_size * stride;
1662	} else {
1663		/* usual PCM */
1664		if (!subs->tx_length_quirk)
1665			copy_to_urb(subs, urb, 0, stride, bytes);
1666		else
1667			bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
1668			/* bytes is now amount of outgoing data */
1669	}
1670
1671	/* update delay with exact number of samples queued */
1672	runtime->delay = subs->last_delay;
1673	runtime->delay += frames;
1674	subs->last_delay = runtime->delay;
1675
1676	/* realign last_frame_number */
1677	subs->last_frame_number = usb_get_current_frame_number(subs->dev);
1678	subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
1679
1680	if (subs->trigger_tstamp_pending_update) {
1681		/* this is the first actual URB submitted,
1682		 * update trigger timestamp to reflect actual start time
1683		 */
1684		snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1685		subs->trigger_tstamp_pending_update = false;
1686	}
1687
1688	spin_unlock_irqrestore(&subs->lock, flags);
1689	urb->transfer_buffer_length = bytes;
1690	if (period_elapsed)
1691		snd_pcm_period_elapsed(subs->pcm_substream);
1692}
1693
1694/*
1695 * process after playback data complete
1696 * - decrease the delay count again
1697 */
1698static void retire_playback_urb(struct snd_usb_substream *subs,
1699			       struct urb *urb)
1700{
1701	unsigned long flags;
1702	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1703	struct snd_usb_endpoint *ep = subs->data_endpoint;
1704	int processed = urb->transfer_buffer_length / ep->stride;
1705	int est_delay;
1706
1707	/* ignore the delay accounting when processed=0 is given, i.e.
1708	 * silent payloads are processed before handling the actual data
1709	 */
1710	if (!processed)
1711		return;
1712
1713	spin_lock_irqsave(&subs->lock, flags);
1714	if (!subs->last_delay)
1715		goto out; /* short path */
1716
1717	est_delay = snd_usb_pcm_delay(subs, runtime->rate);
1718	/* update delay with exact number of samples played */
1719	if (processed > subs->last_delay)
1720		subs->last_delay = 0;
1721	else
1722		subs->last_delay -= processed;
1723	runtime->delay = subs->last_delay;
1724
1725	/*
1726	 * Report when delay estimate is off by more than 2ms.
1727	 * The error should be lower than 2ms since the estimate relies
1728	 * on two reads of a counter updated every ms.
1729	 */
1730	if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
1731		dev_dbg_ratelimited(&subs->dev->dev,
1732			"delay: estimated %d, actual %d\n",
1733			est_delay, subs->last_delay);
1734
1735	if (!subs->running) {
1736		/* update last_frame_number for delay counting here since
1737		 * prepare_playback_urb won't be called during pause
1738		 */
1739		subs->last_frame_number =
1740			usb_get_current_frame_number(subs->dev) & 0xff;
1741	}
1742
1743 out:
1744	spin_unlock_irqrestore(&subs->lock, flags);
1745}
1746
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1747static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
1748					      int cmd)
1749{
1750	struct snd_usb_substream *subs = substream->runtime->private_data;
1751
1752	switch (cmd) {
1753	case SNDRV_PCM_TRIGGER_START:
1754		subs->trigger_tstamp_pending_update = true;
1755		fallthrough;
1756	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1757		subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
1758		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1759		subs->running = 1;
1760		return 0;
1761	case SNDRV_PCM_TRIGGER_STOP:
1762		stop_endpoints(subs);
1763		subs->running = 0;
1764		return 0;
1765	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1766		subs->data_endpoint->prepare_data_urb = NULL;
1767		/* keep retire_data_urb for delay calculation */
1768		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1769		subs->running = 0;
1770		return 0;
1771	case SNDRV_PCM_TRIGGER_SUSPEND:
1772		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1773			stop_endpoints(subs);
1774			subs->need_setup_fmt = true;
1775			return 0;
1776		}
1777		break;
1778	}
1779
1780	return -EINVAL;
1781}
1782
1783static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
1784					     int cmd)
1785{
1786	int err;
1787	struct snd_usb_substream *subs = substream->runtime->private_data;
1788
1789	switch (cmd) {
1790	case SNDRV_PCM_TRIGGER_START:
1791		err = start_endpoints(subs);
1792		if (err < 0)
1793			return err;
1794
1795		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1796		subs->running = 1;
1797		return 0;
1798	case SNDRV_PCM_TRIGGER_STOP:
1799		stop_endpoints(subs);
1800		subs->data_endpoint->retire_data_urb = NULL;
1801		subs->running = 0;
1802		return 0;
1803	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1804		subs->data_endpoint->retire_data_urb = NULL;
1805		subs->running = 0;
1806		return 0;
1807	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1808		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1809		subs->running = 1;
1810		return 0;
1811	case SNDRV_PCM_TRIGGER_SUSPEND:
1812		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
1813			stop_endpoints(subs);
1814			subs->need_setup_fmt = true;
1815			return 0;
1816		}
1817		break;
1818	}
1819
1820	return -EINVAL;
1821}
1822
1823static const struct snd_pcm_ops snd_usb_playback_ops = {
1824	.open =		snd_usb_pcm_open,
1825	.close =	snd_usb_pcm_close,
 
1826	.hw_params =	snd_usb_hw_params,
1827	.hw_free =	snd_usb_hw_free,
1828	.prepare =	snd_usb_pcm_prepare,
1829	.trigger =	snd_usb_substream_playback_trigger,
1830	.sync_stop =	snd_usb_pcm_sync_stop,
1831	.pointer =	snd_usb_pcm_pointer,
 
 
1832};
1833
1834static const struct snd_pcm_ops snd_usb_capture_ops = {
1835	.open =		snd_usb_pcm_open,
1836	.close =	snd_usb_pcm_close,
 
1837	.hw_params =	snd_usb_hw_params,
1838	.hw_free =	snd_usb_hw_free,
1839	.prepare =	snd_usb_pcm_prepare,
1840	.trigger =	snd_usb_substream_capture_trigger,
1841	.sync_stop =	snd_usb_pcm_sync_stop,
1842	.pointer =	snd_usb_pcm_pointer,
 
 
1843};
1844
1845void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
1846{
1847	const struct snd_pcm_ops *ops;
1848
1849	ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
1850			&snd_usb_playback_ops : &snd_usb_capture_ops;
1851	snd_pcm_set_ops(pcm, stream, ops);
1852}
1853
1854void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
1855{
1856	struct snd_pcm *pcm = subs->stream->pcm;
1857	struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
1858	struct device *dev = subs->dev->bus->controller;
1859
1860	if (snd_usb_use_vmalloc)
1861		snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
1862					   NULL, 0, 0);
1863	else
1864		snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
1865					   dev, 64*1024, 512*1024);
1866}