pcm.c 44.5 KB
Newer Older
Daniel Mack's avatar
Daniel Mack committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
18
#include <linux/slab.h>
19
#include <linux/bitrev.h>
20
#include <linux/ratelimit.h>
Daniel Mack's avatar
Daniel Mack committed
21 22
#include <linux/usb.h>
#include <linux/usb/audio.h>
Daniel Mack's avatar
Daniel Mack committed
23
#include <linux/usb/audio-v2.h>
Daniel Mack's avatar
Daniel Mack committed
24 25 26 27 28 29 30 31 32

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "debug.h"
33
#include "endpoint.h"
Daniel Mack's avatar
Daniel Mack committed
34 35
#include "helper.h"
#include "pcm.h"
36
#include "clock.h"
37
#include "power.h"
Daniel Mack's avatar
Daniel Mack committed
38

39 40 41
#define SUBSTREAM_FLAG_DATA_EP_STARTED	0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED	1

42 43 44 45 46 47 48 49
/* return the estimated delay based on USB frame counters */
snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
				    unsigned int rate)
{
	int current_frame_number;
	int frame_diff;
	int est_delay;

50 51 52
	if (!subs->last_delay)
		return 0; /* short path */

53 54 55 56 57 58 59 60 61 62
	current_frame_number = usb_get_current_frame_number(subs->dev);
	/*
	 * HCD implementations use different widths, use lower 8 bits.
	 * The delay will be managed up to 256ms, which is more than
	 * enough
	 */
	frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;

	/* Approximation based on number of samples per USB frame (ms),
	   some truncation for 44.1 but the estimate is good enough */
63 64 65 66 67 68
	est_delay =  frame_diff * rate / 1000;
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
		est_delay = subs->last_delay - est_delay;
	else
		est_delay = subs->last_delay + est_delay;

69 70 71 72 73
	if (est_delay < 0)
		est_delay = 0;
	return est_delay;
}

Daniel Mack's avatar
Daniel Mack committed
74 75 76 77 78 79 80 81 82
/*
 * return the current pcm pointer.  just based on the hwptr_done value.
 */
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs;
	unsigned int hwptr_done;

	subs = (struct snd_usb_substream *)substream->runtime->private_data;
83 84
	if (subs->stream->chip->shutdown)
		return SNDRV_PCM_POS_XRUN;
Daniel Mack's avatar
Daniel Mack committed
85 86
	spin_lock(&subs->lock);
	hwptr_done = subs->hwptr_done;
87
	substream->runtime->delay = snd_usb_pcm_delay(subs,
88
						substream->runtime->rate);
Daniel Mack's avatar
Daniel Mack committed
89 90 91 92 93 94 95
	spin_unlock(&subs->lock);
	return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
96
static struct audioformat *find_format(struct snd_usb_substream *subs)
Daniel Mack's avatar
Daniel Mack committed
97
{
98
	struct audioformat *fp;
Daniel Mack's avatar
Daniel Mack committed
99 100 101
	struct audioformat *found = NULL;
	int cur_attr = 0, attr;

102
	list_for_each_entry(fp, &subs->fmt_list, list) {
103
		if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
104
			continue;
105
		if (fp->channels != subs->channels)
Daniel Mack's avatar
Daniel Mack committed
106
			continue;
107 108
		if (subs->cur_rate < fp->rate_min ||
		    subs->cur_rate > fp->rate_max)
Daniel Mack's avatar
Daniel Mack committed
109 110 111 112
			continue;
		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
			unsigned int i;
			for (i = 0; i < fp->nr_rates; i++)
113
				if (fp->rate_table[i] == subs->cur_rate)
Daniel Mack's avatar
Daniel Mack committed
114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
					break;
			if (i >= fp->nr_rates)
				continue;
		}
		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
		if (! found) {
			found = fp;
			cur_attr = attr;
			continue;
		}
		/* avoid async out and adaptive in if the other method
		 * supports the same format.
		 * this is a workaround for the case like
		 * M-audio audiophile USB.
		 */
		if (attr != cur_attr) {
			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE))
				continue;
			if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
			    (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
			     subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
				found = fp;
				cur_attr = attr;
				continue;
			}
		}
		/* find the format with the largest max. packet size */
		if (fp->maxpacksize > found->maxpacksize) {
			found = fp;
			cur_attr = attr;
		}
	}
	return found;
}

153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned int ep;
	unsigned char data[1];
	int err;

	ep = get_endpoint(alts, 0)->bEndpointAddress;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
				   USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
				   UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
168
				   data, sizeof(data))) < 0) {
169 170 171 172 173 174 175
		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
			   dev->devnum, iface, ep);
		return err;
	}

	return 0;
}
Daniel Mack's avatar
Daniel Mack committed
176

177 178 179 180 181 182 183 184 185 186 187 188
static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
			 struct usb_host_interface *alts,
			 struct audioformat *fmt)
{
	struct usb_device *dev = chip->dev;
	unsigned char data[1];
	int err;

	data[0] = 1;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
				   UAC2_EP_CS_PITCH << 8, 0,
189
				   data, sizeof(data))) < 0) {
190 191 192 193 194 195 196 197
		snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
			   dev->devnum, iface, fmt->altsetting);
		return err;
	}

	return 0;
}

Daniel Mack's avatar
Daniel Mack committed
198
/*
199
 * initialize the pitch control and sample rate
Daniel Mack's avatar
Daniel Mack committed
200
 */
201
int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
Daniel Mack's avatar
Daniel Mack committed
202 203 204
		       struct usb_host_interface *alts,
		       struct audioformat *fmt)
{
205 206 207 208
	/* if endpoint doesn't have pitch control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
		return 0;

209
	switch (fmt->protocol) {
210
	case UAC_VERSION_1:
211
	default:
212 213 214
		return init_pitch_v1(chip, iface, alts, fmt);

	case UAC_VERSION_2:
215
		return init_pitch_v2(chip, iface, alts, fmt);
216 217 218
	}
}

219
static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
220 221 222 223 224 225 226 227 228 229 230 231
{
	int err;

	if (!subs->data_endpoint)
		return -EINVAL;

	if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->data_endpoint;

		snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);

		ep->data_subs = subs;
232
		err = snd_usb_endpoint_start(ep, can_sleep);
233 234 235 236 237 238 239 240 241 242
		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
			return err;
		}
	}

	if (subs->sync_endpoint &&
	    !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
		struct snd_usb_endpoint *ep = subs->sync_endpoint;

243 244 245 246 247 248 249 250 251 252 253 254 255 256 257
		if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
		    subs->data_endpoint->alt_idx != subs->sync_endpoint->alt_idx) {
			err = usb_set_interface(subs->dev,
						subs->sync_endpoint->iface,
						subs->sync_endpoint->alt_idx);
			if (err < 0) {
				snd_printk(KERN_ERR
					   "%d:%d:%d: cannot set interface (%d)\n",
					   subs->dev->devnum,
					   subs->sync_endpoint->iface,
					   subs->sync_endpoint->alt_idx, err);
				return -EIO;
			}
		}

258 259 260
		snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);

		ep->sync_slave = subs->data_endpoint;
261
		err = snd_usb_endpoint_start(ep, can_sleep);
262 263 264 265 266 267 268 269 270
		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
			return err;
		}
	}

	return 0;
}

271
static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
272 273
{
	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
274
		snd_usb_endpoint_stop(subs->sync_endpoint);
275 276

	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
277 278 279 280 281 282
		snd_usb_endpoint_stop(subs->data_endpoint);

	if (wait) {
		snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
		snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
	}
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
}

static int deactivate_endpoints(struct snd_usb_substream *subs)
{
	int reta, retb;

	reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
	retb = snd_usb_endpoint_deactivate(subs->data_endpoint);

	if (reta < 0)
		return reta;

	if (retb < 0)
		return retb;

	return 0;
}

301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
				     unsigned int altsetting,
				     struct usb_host_interface **alts,
				     unsigned int *ep)
{
	struct usb_interface *iface;
	struct usb_interface_descriptor *altsd;
	struct usb_endpoint_descriptor *epd;

	iface = usb_ifnum_to_if(dev, ifnum);
	if (!iface || iface->num_altsetting < altsetting + 1)
		return -ENOENT;
	*alts = &iface->altsetting[altsetting];
	altsd = get_iface_desc(*alts);
	if (altsd->bAlternateSetting != altsetting ||
	    altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
	    (altsd->bInterfaceSubClass != 2 &&
	     altsd->bInterfaceProtocol != 2   ) ||
	    altsd->bNumEndpoints < 1)
		return -ENOENT;
	epd = get_endpoint(*alts, 0);
	if (!usb_endpoint_is_isoc_in(epd) ||
	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
					USB_ENDPOINT_USAGE_IMPLICIT_FB)
		return -ENOENT;
	*ep = epd->bEndpointAddress;
	return 0;
}

330 331 332 333
static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
					 struct usb_device *dev,
					 struct usb_interface_descriptor *altsd,
					 unsigned int attr)
Daniel Mack's avatar
Daniel Mack committed
334
{
335
	struct usb_host_interface *alts;
Daniel Mack's avatar
Daniel Mack committed
336
	struct usb_interface *iface;
337
	unsigned int ep;
338

339 340 341 342
	/* Implicit feedback sync EPs consumers are always playback EPs */
	if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
		return 0;

343
	switch (subs->stream->chip->usb_id) {
344
	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
345
	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
346 347
		ep = 0x81;
		iface = usb_ifnum_to_if(dev, 3);
348

349 350
		if (!iface || iface->num_altsetting == 0)
			return -EINVAL;
351

352 353
		alts = &iface->altsetting[1];
		goto add_sync_ep;
354
		break;
355 356
	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
	case USB_ID(0x0763, 0x2081):
357 358
		ep = 0x81;
		iface = usb_ifnum_to_if(dev, 2);
359

360 361
		if (!iface || iface->num_altsetting == 0)
			return -EINVAL;
362

363 364
		alts = &iface->altsetting[1];
		goto add_sync_ep;
365
	}
366
	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
367 368 369 370 371 372 373 374 375
	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
	    altsd->bInterfaceProtocol == 2 &&
	    altsd->bNumEndpoints == 1 &&
	    USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
	    search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
				      altsd->bAlternateSetting,
				      &alts, &ep) >= 0) {
		goto add_sync_ep;
	}
376

377 378 379 380 381 382
	/* No quirk */
	return 0;

add_sync_ep:
	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
383
						   SND_USB_ENDPOINT_TYPE_DATA);
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
	if (!subs->sync_endpoint)
		return -EINVAL;

	subs->data_endpoint->sync_master = subs->sync_endpoint;

	return 0;
}

static int set_sync_endpoint(struct snd_usb_substream *subs,
			     struct audioformat *fmt,
			     struct usb_device *dev,
			     struct usb_host_interface *alts,
			     struct usb_interface_descriptor *altsd)
{
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
	unsigned int ep, attr;
400
	bool implicit_fb;
401 402 403 404 405 406 407 408 409 410 411 412 413
	int err;

	/* we need a sync pipe in async OUT or adaptive IN mode */
	/* check the number of EP, since some devices have broken
	 * descriptors which fool us.  if it has only one EP,
	 * assume it as adaptive-out or sync-in.
	 */
	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;

	err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
	if (err < 0)
		return err;

414 415
	if (altsd->bNumEndpoints < 2)
		return 0;
416

417 418 419
	if ((is_playback && attr != USB_ENDPOINT_SYNC_ASYNC) ||
	    (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
		return 0;
420

421 422 423 424 425 426
	/* check sync-pipe endpoint */
	/* ... and check descriptor size before accessing bSynchAddress
	   because there is a version of the SB Audigy 2 NX firmware lacking
	   the audio fields in the endpoint descriptors */
	if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
	    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
427
	     get_endpoint(alts, 1)->bSynchAddress != 0)) {
428 429 430 431 432 433 434 435
		snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
			   dev->devnum, fmt->iface, fmt->altsetting,
			   get_endpoint(alts, 1)->bmAttributes,
			   get_endpoint(alts, 1)->bLength,
			   get_endpoint(alts, 1)->bSynchAddress);
		return -EINVAL;
	}
	ep = get_endpoint(alts, 1)->bEndpointAddress;
436
	if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
437 438 439 440 441 442
	    ((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
	     (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
		snd_printk(KERN_ERR "%d:%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
			   dev->devnum, fmt->iface, fmt->altsetting,
			   is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
		return -EINVAL;
443
	}
Daniel Mack's avatar
Daniel Mack committed
444

445 446 447 448 449 450 451 452 453 454 455 456 457
	implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
			== USB_ENDPOINT_USAGE_IMPLICIT_FB;

	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, ep, !subs->direction,
						   implicit_fb ?
							SND_USB_ENDPOINT_TYPE_DATA :
							SND_USB_ENDPOINT_TYPE_SYNC);
	if (!subs->sync_endpoint)
		return -EINVAL;

	subs->data_endpoint->sync_master = subs->sync_endpoint;

458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
	return 0;
}

/*
 * find a matching format and set up the interface
 */
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
	struct usb_device *dev = subs->dev;
	struct usb_host_interface *alts;
	struct usb_interface_descriptor *altsd;
	struct usb_interface *iface;
	int err;

	iface = usb_ifnum_to_if(dev, fmt->iface);
	if (WARN_ON(!iface))
		return -EINVAL;
	alts = &iface->altsetting[fmt->altset_idx];
	altsd = get_iface_desc(alts);
	if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
		return -EINVAL;

	if (fmt == subs->cur_audiofmt)
		return 0;

	/* close the old interface */
	if (subs->interface >= 0 && subs->interface != fmt->iface) {
		err = usb_set_interface(subs->dev, subs->interface, 0);
		if (err < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
				dev->devnum, fmt->iface, fmt->altsetting, err);
			return -EIO;
		}
		subs->interface = -1;
		subs->altset_idx = 0;
	}

	/* set interface */
	if (subs->interface != fmt->iface ||
	    subs->altset_idx != fmt->altset_idx) {
		err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
		if (err < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
				   dev->devnum, fmt->iface, fmt->altsetting, err);
			return -EIO;
		}
		snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
				fmt->iface, fmt->altsetting);
		subs->interface = fmt->iface;
		subs->altset_idx = fmt->altset_idx;

		snd_usb_set_interface_quirk(dev);
	}

	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
						   alts, fmt->endpoint, subs->direction,
						   SND_USB_ENDPOINT_TYPE_DATA);

	if (!subs->data_endpoint)
		return -EINVAL;

	err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
	if (err < 0)
		return err;

523 524
	err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
	if (err < 0)
Daniel Mack's avatar
Daniel Mack committed
525 526 527 528 529 530 531 532 533
		return err;

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

	return 0;
}

534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
/*
 * Return the score of matching two audioformats.
 * Veto the audioformat if:
 * - It has no channels for some reason.
 * - Requested PCM format is not supported.
 * - Requested sample rate is not supported.
 */
static int match_endpoint_audioformats(struct audioformat *fp,
	struct audioformat *match, int rate,
	snd_pcm_format_t pcm_format)
{
	int i;
	int score = 0;

	if (fp->channels < 1) {
		snd_printdd("%s: (fmt @%p) no channels\n", __func__, fp);
		return 0;
	}

553
	if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591
		snd_printdd("%s: (fmt @%p) no match for format %d\n", __func__,
			fp, pcm_format);
		return 0;
	}

	for (i = 0; i < fp->nr_rates; i++) {
		if (fp->rate_table[i] == rate) {
			score++;
			break;
		}
	}
	if (!score) {
		snd_printdd("%s: (fmt @%p) no match for rate %d\n", __func__,
			fp, rate);
		return 0;
	}

	if (fp->channels == match->channels)
		score++;

	snd_printdd("%s: (fmt @%p) score %d\n", __func__, fp, score);

	return score;
}

/*
 * Configure the sync ep using the rate and pcm format of the data ep.
 */
static int configure_sync_endpoint(struct snd_usb_substream *subs)
{
	int ret;
	struct audioformat *fp;
	struct audioformat *sync_fp = NULL;
	int cur_score = 0;
	int sync_period_bytes = subs->period_bytes;
	struct snd_usb_substream *sync_subs =
		&subs->stream->substream[subs->direction ^ 1];

592 593 594 595 596 597 598 599 600 601
	if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
	    !subs->stream)
		return snd_usb_endpoint_set_params(subs->sync_endpoint,
						   subs->pcm_format,
						   subs->channels,
						   subs->period_bytes,
						   subs->cur_rate,
						   subs->cur_audiofmt,
						   NULL);

602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640
	/* Try to find the best matching audioformat. */
	list_for_each_entry(fp, &sync_subs->fmt_list, list) {
		int score = match_endpoint_audioformats(fp, subs->cur_audiofmt,
			subs->cur_rate, subs->pcm_format);

		if (score > cur_score) {
			sync_fp = fp;
			cur_score = score;
		}
	}

	if (unlikely(sync_fp == NULL)) {
		snd_printk(KERN_ERR "%s: no valid audioformat for sync ep %x found\n",
			__func__, sync_subs->ep_num);
		return -EINVAL;
	}

	/*
	 * Recalculate the period bytes if channel number differ between
	 * data and sync ep audioformat.
	 */
	if (sync_fp->channels != subs->channels) {
		sync_period_bytes = (subs->period_bytes / subs->channels) *
			sync_fp->channels;
		snd_printdd("%s: adjusted sync ep period bytes (%d -> %d)\n",
			__func__, subs->period_bytes, sync_period_bytes);
	}

	ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
					  subs->pcm_format,
					  sync_fp->channels,
					  sync_period_bytes,
					  subs->cur_rate,
					  sync_fp,
					  NULL);

	return ret;
}

641 642 643 644 645 646 647 648 649 650
/*
 * configure endpoint params
 *
 * called  during initial setup and upon resume
 */
static int configure_endpoint(struct snd_usb_substream *subs)
{
	int ret;

	/* format changed */
651
	stop_endpoints(subs, true);
652 653 654 655 656 657 658 659
	ret = snd_usb_endpoint_set_params(subs->data_endpoint,
					  subs->pcm_format,
					  subs->channels,
					  subs->period_bytes,
					  subs->cur_rate,
					  subs->cur_audiofmt,
					  subs->sync_endpoint);
	if (ret < 0)
660
		return ret;
661 662

	if (subs->sync_endpoint)
663 664
		ret = configure_sync_endpoint(subs);

665 666 667
	return ret;
}

Daniel Mack's avatar
Daniel Mack committed
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
/*
 * hw_params callback
 *
 * allocate a buffer and set the given audio format.
 *
 * so far we use a physically linear buffer although packetize transfer
 * doesn't need a continuous area.
 * if sg buffer is supported on the later version of alsa, we'll follow
 * that.
 */
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *hw_params)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;
	struct audioformat *fmt;
683
	int ret;
Daniel Mack's avatar
Daniel Mack committed
684 685 686 687 688 689

	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
					       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

690 691 692 693 694 695
	subs->pcm_format = params_format(hw_params);
	subs->period_bytes = params_period_bytes(hw_params);
	subs->channels = params_channels(hw_params);
	subs->cur_rate = params_rate(hw_params);

	fmt = find_format(subs);
Daniel Mack's avatar
Daniel Mack committed
696 697
	if (!fmt) {
		snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
698
			   subs->pcm_format, subs->cur_rate, subs->channels);
Daniel Mack's avatar
Daniel Mack committed
699 700 701
		return -EINVAL;
	}

702
	down_read(&subs->stream->chip->shutdown_rwsem);
703 704 705 706
	if (subs->stream->chip->shutdown)
		ret = -ENODEV;
	else
		ret = set_format(subs, fmt);
707
	up_read(&subs->stream->chip->shutdown_rwsem);
708
	if (ret < 0)
Daniel Mack's avatar
Daniel Mack committed
709 710
		return ret;

711 712
	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
713
	subs->need_setup_ep = true;
714

715
	return 0;
Daniel Mack's avatar
Daniel Mack committed
716 717 718 719 720 721 722 723 724 725 726 727 728 729
}

/*
 * hw_free callback
 *
 * reset the audio format and release the buffer
 */
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	subs->cur_audiofmt = NULL;
	subs->cur_rate = 0;
	subs->period_bytes = 0;
730
	down_read(&subs->stream->chip->shutdown_rwsem);
731
	if (!subs->stream->chip->shutdown) {
732
		stop_endpoints(subs, true);
733 734
		deactivate_endpoints(subs);
	}
735
	up_read(&subs->stream->chip->shutdown_rwsem);
Daniel Mack's avatar
Daniel Mack committed
736 737 738 739 740 741 742 743 744 745 746 747
	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

/*
 * prepare callback
 *
 * only a few subtle things...
 */
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = runtime->private_data;
748 749 750
	struct usb_host_interface *alts;
	struct usb_interface *iface;
	int ret;
Daniel Mack's avatar
Daniel Mack committed
751 752 753 754 755 756

	if (! subs->cur_audiofmt) {
		snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
		return -ENXIO;
	}

757
	down_read(&subs->stream->chip->shutdown_rwsem);
758 759 760 761 762 763 764 765
	if (subs->stream->chip->shutdown) {
		ret = -ENODEV;
		goto unlock;
	}
	if (snd_BUG_ON(!subs->data_endpoint)) {
		ret = -EIO;
		goto unlock;
	}
766

767 768 769
	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);

770 771
	ret = set_format(subs, subs->cur_audiofmt);
	if (ret < 0)
772
		goto unlock;
773 774 775 776 777 778 779 780 781

	iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
	alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
	ret = snd_usb_init_sample_rate(subs->stream->chip,
				       subs->cur_audiofmt->iface,
				       alts,
				       subs->cur_audiofmt,
				       subs->cur_rate);
	if (ret < 0)
782
		goto unlock;
783

784 785 786
	if (subs->need_setup_ep) {
		ret = configure_endpoint(subs);
		if (ret < 0)
787
			goto unlock;
788 789
		subs->need_setup_ep = false;
	}
790

Daniel Mack's avatar
Daniel Mack committed
791
	/* some unit conversions in runtime */
792 793 794 795
	subs->data_endpoint->maxframesize =
		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
	subs->data_endpoint->curframesize =
		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
Daniel Mack's avatar
Daniel Mack committed
796 797 798 799

	/* reset the pointer */
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
800 801
	subs->last_delay = 0;
	subs->last_frame_number = 0;
Daniel Mack's avatar
Daniel Mack committed
802 803
	runtime->delay = 0;

804 805 806
	/* for playback, submit the URBs now; otherwise, the first hwptr_done
	 * updates for all URBs would happen at the same time when starting */
	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
807
		ret = start_endpoints(subs, true);
808

809
 unlock:
810
	up_read(&subs->stream->chip->shutdown_rwsem);
811
	return ret;
Daniel Mack's avatar
Daniel Mack committed
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
}

static struct snd_pcm_hardware snd_usb_hardware =
{
	.info =			SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_BATCH |
				SNDRV_PCM_INFO_INTERLEAVED |
				SNDRV_PCM_INFO_BLOCK_TRANSFER |
				SNDRV_PCM_INFO_PAUSE,
	.buffer_bytes_max =	1024 * 1024,
	.period_bytes_min =	64,
	.period_bytes_max =	512 * 1024,
	.periods_min =		2,
	.periods_max =		1024,
};

static int hw_check_valid_format(struct snd_usb_substream *subs,
				 struct snd_pcm_hw_params *params,
				 struct audioformat *fp)
{
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
837
	struct snd_mask check_fmts;
Daniel Mack's avatar
Daniel Mack committed
838 839 840
	unsigned int ptime;

	/* check the format */
841 842 843 844 845
	snd_mask_none(&check_fmts);
	check_fmts.bits[0] = (u32)fp->formats;
	check_fmts.bits[1] = (u32)(fp->formats >> 32);
	snd_mask_intersect(&check_fmts, fmts);
	if (snd_mask_empty(&check_fmts)) {
Daniel Mack's avatar
Daniel Mack committed
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863
		hwc_debug("   > check: no supported format %d\n", fp->format);
		return 0;
	}
	/* check the channels */
	if (fp->channels < ct->min || fp->channels > ct->max) {
		hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
		return 0;
	}
	/* check the rate is within the range */
	if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
		hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
		return 0;
	}
	if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
		hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
		return 0;
	}
	/* check whether the period time is >= the data packet interval */
864
	if (subs->speed != USB_SPEED_FULL) {
Daniel Mack's avatar
Daniel Mack committed
865 866 867 868 869 870 871 872 873 874 875 876 877
		ptime = 125 * (1 << fp->datainterval);
		if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
			hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
			return 0;
		}
	}
	return 1;
}

static int hw_rule_rate(struct snd_pcm_hw_params *params,
			struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
878
	struct audioformat *fp;
Daniel Mack's avatar
Daniel Mack committed
879 880 881 882 883 884 885
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
886
	list_for_each_entry(fp, &subs->fmt_list, list) {
Daniel Mack's avatar
Daniel Mack committed
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->rate_min)
				rmin = fp->rate_min;
			if (rmax < fp->rate_max)
				rmax = fp->rate_max;
		} else {
			rmin = fp->rate_min;
			rmax = fp->rate_max;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}


static int hw_rule_channels(struct snd_pcm_hw_params *params,
			    struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
930
	struct audioformat *fp;
Daniel Mack's avatar
Daniel Mack committed
931 932 933 934 935 936 937
	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	unsigned int rmin, rmax;
	int changed;

	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
	changed = 0;
	rmin = rmax = 0;
938
	list_for_each_entry(fp, &subs->fmt_list, list) {
Daniel Mack's avatar
Daniel Mack committed
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		if (changed++) {
			if (rmin > fp->channels)
				rmin = fp->channels;
			if (rmax < fp->channels)
				rmax = fp->channels;
		} else {
			rmin = fp->channels;
			rmax = fp->channels;
		}
	}

	if (!changed) {
		hwc_debug("  --> get empty\n");
		it->empty = 1;
		return -EINVAL;
	}

	changed = 0;
	if (it->min < rmin) {
		it->min = rmin;
		it->openmin = 0;
		changed = 1;
	}
	if (it->max > rmax) {
		it->max = rmax;
		it->openmax = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

static int hw_rule_format(struct snd_pcm_hw_params *params,
			  struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
981
	struct audioformat *fp;
Daniel Mack's avatar
Daniel Mack committed
982 983 984 985 986 987 988
	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	u64 fbits;
	u32 oldbits[2];
	int changed;

	hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
	fbits = 0;
989
	list_for_each_entry(fp, &subs->fmt_list, list) {
Daniel Mack's avatar
Daniel Mack committed
990 991
		if (!hw_check_valid_format(subs, params, fp))
			continue;
992
		fbits |= fp->formats;
Daniel Mack's avatar
Daniel Mack committed
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
	}

	oldbits[0] = fmt->bits[0];
	oldbits[1] = fmt->bits[1];
	fmt->bits[0] &= (u32)fbits;
	fmt->bits[1] &= (u32)(fbits >> 32);
	if (!fmt->bits[0] && !fmt->bits[1]) {
		hwc_debug("  --> get empty\n");
		return -EINVAL;
	}
	changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
	hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
	return changed;
}

static int hw_rule_period_time(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
{
	struct snd_usb_substream *subs = rule->private;
	struct audioformat *fp;
	struct snd_interval *it;
	unsigned char min_datainterval;
	unsigned int pmin;
	int changed;

	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
	min_datainterval = 0xff;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (!hw_check_valid_format(subs, params, fp))
			continue;
		min_datainterval = min(min_datainterval, fp->datainterval);
	}
	if (min_datainterval == 0xff) {
1027
		hwc_debug("  --> get empty\n");
Daniel Mack's avatar
Daniel Mack committed
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
		it->empty = 1;
		return -EINVAL;
	}
	pmin = 125 * (1 << min_datainterval);
	changed = 0;
	if (it->min < pmin) {
		it->min = pmin;
		it->openmin = 0;
		changed = 1;
	}
	if (snd_interval_checkempty(it)) {
		it->empty = 1;
		return -EINVAL;
	}
	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
	return changed;
}

/*
 *  If the device supports unusual bit rates, does the request meet these?
 */
static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
				  struct snd_usb_substream *subs)
{
	struct audioformat *fp;
1053
	int *rate_list;
Daniel Mack's avatar
Daniel Mack committed
1054 1055 1056
	int count = 0, needs_knot = 0;
	int err;

1057 1058 1059
	kfree(subs->rate_list.list);
	subs->rate_list.list = NULL;

Daniel Mack's avatar
Daniel Mack committed
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
	list_for_each_entry(fp, &subs->fmt_list, list) {
		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
			return 0;
		count += fp->nr_rates;
		if (fp->rates & SNDRV_PCM_RATE_KNOT)
			needs_knot = 1;
	}
	if (!needs_knot)
		return 0;

1070 1071
	subs->rate_list.list = rate_list =
		kmalloc(sizeof(int) * count, GFP_KERNEL);
1072 1073 1074
	if (!subs->rate_list.list)
		return -ENOMEM;
	subs->rate_list.count = count;
Daniel Mack's avatar
Daniel Mack committed
1075 1076 1077 1078 1079
	subs->rate_list.mask = 0;
	count = 0;
	list_for_each_entry(fp, &subs->fmt_list, list) {
		int i;
		for (i = 0; i < fp->nr_rates; i++)
1080
			rate_list[count++] = fp->rate_table[i];
Daniel Mack's avatar
Daniel Mack committed
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	}
	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					 &subs->rate_list);
	if (err < 0)
		return err;

	return 0;
}


/*
 * set up the runtime hardware information.
 */

static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
1097
	struct audioformat *fp;
Daniel Mack's avatar
Daniel Mack committed
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110
	unsigned int pt, ptmin;
	int param_period_time_if_needed;
	int err;

	runtime->hw.formats = subs->formats;

	runtime->hw.rate_min = 0x7fffffff;
	runtime->hw.rate_max = 0;
	runtime->hw.channels_min = 256;
	runtime->hw.channels_max = 0;
	runtime->hw.rates = 0;
	ptmin = UINT_MAX;
	/* check min/max rates and channels */
1111
	list_for_each_entry(fp, &subs->fmt_list, list) {
Daniel Mack's avatar
Daniel Mack committed
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
		runtime->hw.rates |= fp->rates;
		if (runtime->hw.rate_min > fp->rate_min)
			runtime->hw.rate_min = fp->rate_min;
		if (runtime->hw.rate_max < fp->rate_max)
			runtime->hw.rate_max = fp->rate_max;
		if (runtime->hw.channels_min > fp->channels)
			runtime->hw.channels_min = fp->channels;
		if (runtime->hw.channels_max < fp->channels)
			runtime->hw.channels_max = fp->channels;
		if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
			/* FIXME: there might be more than one audio formats... */
			runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
				fp->frame_size;
		}
		pt = 125 * (1 << fp->datainterval);
		ptmin = min(ptmin, pt);
	}
1129 1130 1131
	err = snd_usb_autoresume(subs->stream->chip);
	if (err < 0)
		return err;
Daniel Mack's avatar
Daniel Mack committed
1132 1133

	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1134
	if (subs->speed == USB_SPEED_FULL)
Daniel Mack's avatar
Daniel Mack committed
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
		/* full speed devices have fixed data packet interval */
		ptmin = 1000;
	if (ptmin == 1000)
		/* if period time doesn't go below 1 ms, no rules needed */
		param_period_time_if_needed = -1;
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
				     ptmin, UINT_MAX);

	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
				       hw_rule_rate, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
1149
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
1150 1151 1152 1153 1154 1155
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
				       hw_rule_channels, subs,
				       SNDRV_PCM_HW_PARAM_FORMAT,
				       SNDRV_PCM_HW_PARAM_RATE,
				       param_period_time_if_needed,
				       -1)) < 0)
1156
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
1157 1158 1159 1160 1161 1162
	if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				       hw_rule_format, subs,
				       SNDRV_PCM_HW_PARAM_RATE,
				       SNDRV_PCM_HW_PARAM_CHANNELS,
				       param_period_time_if_needed,
				       -1)) < 0)
1163
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
1164 1165 1166 1167 1168 1169 1170 1171 1172
	if (param_period_time_if_needed >= 0) {
		err = snd_pcm_hw_rule_add(runtime, 0,
					  SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					  hw_rule_period_time, subs,
					  SNDRV_PCM_HW_PARAM_FORMAT,
					  SNDRV_PCM_HW_PARAM_CHANNELS,
					  SNDRV_PCM_HW_PARAM_RATE,
					  -1);
		if (err < 0)
1173
			goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
1174 1175
	}
	if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1176
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
1177
	return 0;
1178 1179 1180 1181

rep_err:
	snd_usb_autosuspend(subs->stream->chip);
	return err;
Daniel Mack's avatar
Daniel Mack committed
1182 1183 1184 1185 1186 1187 1188 1189 1190
}

static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_usb_substream *subs = &as->substream[direction];

	subs->interface = -1;
1191
	subs->altset_idx = 0;
Daniel Mack's avatar
Daniel Mack committed
1192 1193 1194
	runtime->hw = snd_usb_hardware;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
1195
	/* runtime PM is also done there */
1196 1197 1198 1199 1200 1201

	/* initialize DSD/DOP context */
	subs->dsd_dop.byte_idx = 0;
	subs->dsd_dop.channel = 0;
	subs->dsd_dop.marker = 1;

Daniel Mack's avatar
Daniel Mack committed
1202 1203 1204 1205 1206 1207 1208 1209
	return setup_hw_info(runtime, subs);
}

static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
{
	struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
	struct snd_usb_substream *subs = &as->substream[direction];

1210
	stop_endpoints(subs, true);
1211 1212 1213 1214 1215 1216

	if (!as->chip->shutdown && subs->interface >= 0) {
		usb_set_interface(subs->dev, subs->interface, 0);
		subs->interface = -1;
	}

Daniel Mack's avatar
Daniel Mack committed
1217
	subs->pcm_substream = NULL;
1218
	snd_usb_autosuspend(subs->stream->chip);
1219

1220
	return 0;
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
}

/* Since a URB can handle only a single linear buffer, we must use double
 * buffering when the data to be transferred overflows the buffer boundary.
 * To avoid inconsistencies when updating hwptr_done, we use double buffering
 * for all URBs.
 */
static void retire_capture_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride, frames, bytes, oldptr;
	int i, period_elapsed = 0;
	unsigned long flags;
	unsigned char *cp;
1236 1237 1238 1239
	int current_frame_number;

	/* read frame number here, update pointer in critical section */
	current_frame_number = usb_get_current_frame_number(subs->dev);
1240 1241 1242 1243

	stride = runtime->frame_bits >> 3;

	for (i = 0; i < urb->number_of_packets; i++) {
1244
		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
		if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
			snd_printdd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
			// continue;
		}
		bytes = urb->iso_frame_desc[i].actual_length;
		frames = bytes / stride;
		if (!subs->txfr_quirk)
			bytes = frames * stride;
		if (bytes % (runtime->sample_bits >> 3) != 0) {
			int oldbytes = bytes;
			bytes = frames * stride;
			snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
							oldbytes, bytes);
		}
		/* update the current pointer */
		spin_lock_irqsave(&subs->lock, flags);
		oldptr = subs->hwptr_done;
		subs->hwptr_done += bytes;
		if (subs->hwptr_done >= runtime->buffer_size * stride)
			subs->hwptr_done -= runtime->buffer_size * stride;
		frames = (bytes + (oldptr % stride)) / stride;
		subs->transfer_done += frames;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			period_elapsed = 1;
		}
1271 1272 1273 1274 1275 1276 1277 1278 1279
		/* capture delay is by construction limited to one URB,
		 * reset delays here
		 */
		runtime->delay = subs->last_delay = 0;

		/* realign last_frame_number */
		subs->last_frame_number = current_frame_number;
		subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		spin_unlock_irqrestore(&subs->lock, flags);
		/* copy a data chunk */
		if (oldptr + bytes > runtime->buffer_size * stride) {
			unsigned int bytes1 =
					runtime->buffer_size * stride - oldptr;
			memcpy(runtime->dma_area + oldptr, cp, bytes1);
			memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
		} else {
			memcpy(runtime->dma_area + oldptr, cp, bytes);
		}
	}

	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
					     struct urb *urb, unsigned int bytes)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
	unsigned int stride = runtime->frame_bits >> 3;
	unsigned int dst_idx = 0;
	unsigned int src_idx = subs->hwptr_done;
	unsigned int wrap = runtime->buffer_size * stride;
	u8 *dst = urb->transfer_buffer;
	u8 *src = runtime->dma_area;
	u8 marker[] = { 0x05, 0xfa };

	/*
	 * The DSP DOP format defines a way to transport DSD samples over
	 * normal PCM data endpoints. It requires stuffing of marker bytes
	 * (0x05 and 0xfa, alternating per sample frame), and then expects
	 * 2 additional bytes of actual payload. The whole frame is stored
	 * LSB.
	 *
	 * Hence, for a stereo transport, the buffer layout looks like this,
	 * where L refers to left channel samples and R to right.
	 *
	 *   L1 L2 0x05   R1 R2 0x05   L3 L4 0xfa  R3 R4 0xfa
	 *   L5 L6 0x05   R5 R6 0x05   L7 L8 0xfa  R7 R8 0xfa
	 *   .....
	 *
	 */

	while (bytes--) {
		if (++subs->dsd_dop.byte_idx == 3) {
			/* frame boundary? */
			dst[dst_idx++] = marker[subs->dsd_dop.marker];
			src_idx += 2;
			subs->dsd_dop.byte_idx = 0;

			if (++subs->dsd_dop.channel % runtime->channels == 0) {
				/* alternate the marker */
				subs->dsd_dop.marker++;
				subs->dsd_dop.marker %= ARRAY_SIZE(marker);
				subs->dsd_dop.channel = 0;
			}
		} else {
			/* stuff the DSD payload */
			int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
1340 1341 1342 1343 1344 1345

			if (subs->cur_audiofmt->dsd_bitrev)
				dst[dst_idx++] = bitrev8(src[idx]);
			else
				dst[dst_idx++] = src[idx];

1346 1347 1348 1349 1350
			subs->hwptr_done++;
		}
	}
}

1351 1352 1353 1354
static void prepare_playback_urb(struct snd_usb_substream *subs,
				 struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1355
	struct snd_usb_endpoint *ep = subs->data_endpoint;
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
	struct snd_urb_ctx *ctx = urb->context;
	unsigned int counts, frames, bytes;
	int i, stride, period_elapsed = 0;
	unsigned long flags;

	stride = runtime->frame_bits >> 3;

	frames = 0;
	urb->number_of_packets = 0;
	spin_lock_irqsave(&subs->lock, flags);
	for (i = 0; i < ctx->packets; i++) {
1367 1368 1369 1370 1371
		if (ctx->packet_size[i])
			counts = ctx->packet_size[i];
		else
			counts = snd_usb_endpoint_next_packet_size(ep);

1372
		/* set up descriptor */
1373 1374
		urb->iso_frame_desc[i].offset = frames * ep->stride;
		urb->iso_frame_desc[i].length = counts * ep->stride;
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
		frames += counts;
		urb->number_of_packets++;
		subs->transfer_done += counts;
		if (subs->transfer_done >= runtime->period_size) {
			subs->transfer_done -= runtime->period_size;
			period_elapsed = 1;
			if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
				if (subs->transfer_done > 0) {
					/* FIXME: fill-max mode is not
					 * supported yet */
					frames -= subs->transfer_done;
					counts -= subs->transfer_done;
					urb->iso_frame_desc[i].length =
1388
						counts * ep->stride;
1389 1390 1391 1392 1393 1394
					subs->transfer_done = 0;
				}
				i++;
				if (i < ctx->packets) {
					/* add a transfer delimiter */
					urb->iso_frame_desc[i].offset =
1395
						frames * ep->stride;
1396 1397 1398 1399 1400 1401 1402
					urb->iso_frame_desc[i].length = 0;
					urb->number_of_packets++;
				}
				break;
			}
		}
		if (period_elapsed &&
1403
		    !snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
1404 1405
			break;
	}
1406
	bytes = frames * ep->stride;
1407 1408 1409 1410

	if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
		     subs->cur_audiofmt->dsd_dop)) {
		fill_playback_urb_dsd_dop(subs, urb, bytes);
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
	} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
			   subs->cur_audiofmt->dsd_bitrev)) {
		/* bit-reverse the bytes */
		u8 *buf = urb->transfer_buffer;
		for (i = 0; i < bytes; i++) {
			int idx = (subs->hwptr_done + i)
				% (runtime->buffer_size * stride);
			buf[i] = bitrev8(runtime->dma_area[idx]);
		}

		subs->hwptr_done += bytes;
1422
	} else {
1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
		/* usual PCM */
		if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
			/* err, the transferred area goes over buffer boundary. */
			unsigned int bytes1 =
				runtime->buffer_size * stride - subs->hwptr_done;
			memcpy(urb->transfer_buffer,
			       runtime->dma_area + subs->hwptr_done, bytes1);
			memcpy(urb->transfer_buffer + bytes1,
			       runtime->dma_area, bytes - bytes1);
		} else {
			memcpy(urb->transfer_buffer,
			       runtime->dma_area + subs->hwptr_done, bytes);
		}

		subs->hwptr_done += bytes;
1438
	}
1439

1440 1441
	if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
1442 1443 1444

	/* update delay with exact number of samples queued */
	runtime->delay = subs->last_delay;
1445
	runtime->delay += frames;
1446 1447 1448 1449 1450 1451
	subs->last_delay = runtime->delay;

	/* realign last_frame_number */
	subs->last_frame_number = usb_get_current_frame_number(subs->dev);
	subs->last_frame_number &= 0xFF; /* keep 8 LSBs */

1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
	spin_unlock_irqrestore(&subs->lock, flags);
	urb->transfer_buffer_length = bytes;
	if (period_elapsed)
		snd_pcm_period_elapsed(subs->pcm_substream);
}

/*
 * process after playback data complete
 * - decrease the delay count again
 */
static void retire_playback_urb(struct snd_usb_substream *subs,
			       struct urb *urb)
{
	unsigned long flags;
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1467 1468
	struct snd_usb_endpoint *ep = subs->data_endpoint;
	int processed = urb->transfer_buffer_length / ep->stride;
1469
	int est_delay;
1470

1471 1472 1473 1474 1475 1476
	/* ignore the delay accounting when procssed=0 is given, i.e.
	 * silent payloads are procssed before handling the actual data
	 */
	if (!processed)
		return;

1477
	spin_lock_irqsave(&subs->lock, flags);
1478 1479 1480
	if (!subs->last_delay)
		goto out; /* short path */

1481 1482 1483 1484
	est_delay = snd_usb_pcm_delay(subs, runtime->rate);
	/* update delay with exact number of samples played */
	if (processed > subs->last_delay)
		subs->last_delay = 0;
1485
	else
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
		subs->last_delay -= processed;
	runtime->delay = subs->last_delay;

	/*
	 * Report when delay estimate is off by more than 2ms.
	 * The error should be lower than 2ms since the estimate relies
	 * on two reads of a counter updated every ms.
	 */
	if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
		snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
			est_delay, subs->last_delay);

1498 1499 1500 1501 1502 1503 1504 1505 1506
	if (!subs->running) {
		/* update last_frame_number for delay counting here since
		 * prepare_playback_urb won't be called during pause
		 */
		subs->last_frame_number =
			usb_get_current_frame_number(subs->dev) & 0xff;
	}

 out:
1507
	spin_unlock_irqrestore(&subs->lock, flags);
Daniel Mack's avatar
Daniel Mack committed
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
}

static int snd_usb_playback_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_playback_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_usb_capture_open(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
}

static int snd_usb_capture_close(struct snd_pcm_substream *substream)
{
	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
}

1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
					      int cmd)
{
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1540
		subs->running = 1;
1541 1542
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1543
		stop_endpoints(subs, false);
1544
		subs->running = 0;
1545 1546 1547
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->prepare_data_urb = NULL;
1548 1549
		/* keep retire_data_urb for delay calculation */
		subs->data_endpoint->retire_data_urb = retire_playback_urb;
1550
		subs->running = 0;
1551 1552 1553 1554 1555 1556
		return 0;
	}

	return -EINVAL;
}

1557 1558
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
					     int cmd)
1559 1560 1561 1562 1563 1564
{
	int err;
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
1565
		err = start_endpoints(subs, false);
1566 1567 1568 1569
		if (err < 0)
			return err;

		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1570
		subs->running = 1;
1571 1572
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1573
		stop_endpoints(subs, false);
1574
		subs->running = 0;
1575 1576 1577
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->retire_data_urb = NULL;
1578
		subs->running = 0;
1579 1580 1581
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1582
		subs->running = 1;
1583 1584 1585 1586 1587 1588
		return 0;
	}

	return -EINVAL;
}

Daniel Mack's avatar
Daniel Mack committed
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
static struct snd_pcm_ops snd_usb_playback_ops = {
	.open =		snd_usb_playback_open,
	.close =	snd_usb_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_playback_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

static struct snd_pcm_ops snd_usb_capture_ops = {
	.open =		snd_usb_capture_open,
	.close =	snd_usb_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_usb_hw_params,
	.hw_free =	snd_usb_hw_free,
	.prepare =	snd_usb_pcm_prepare,
	.trigger =	snd_usb_substream_capture_trigger,
	.pointer =	snd_usb_pcm_pointer,
	.page =		snd_pcm_lib_get_vmalloc_page,
	.mmap =		snd_pcm_lib_mmap_vmalloc,
};

void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
	snd_pcm_set_ops(pcm, stream,
			stream == SNDRV_PCM_STREAM_PLAYBACK ?
			&snd_usb_playback_ops : &snd_usb_capture_ops);
}