pcm.c 36.9 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/ratelimit.h>
Daniel Mack's avatar
Daniel Mack committed
20 21
#include <linux/usb.h>
#include <linux/usb/audio.h>
Daniel Mack's avatar
Daniel Mack committed
22
#include <linux/usb/audio-v2.h>
Daniel Mack's avatar
Daniel Mack committed
23 24 25 26 27 28 29 30 31

#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"
32
#include "endpoint.h"
Daniel Mack's avatar
Daniel Mack committed
33 34
#include "helper.h"
#include "pcm.h"
35
#include "clock.h"
36
#include "power.h"
Daniel Mack's avatar
Daniel Mack committed
37

38 39 40
#define SUBSTREAM_FLAG_DATA_EP_STARTED	0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED	1

41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
/* 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;

	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 */
	est_delay =  subs->last_delay - (frame_diff * rate / 1000);
	if (est_delay < 0)
		est_delay = 0;
	return est_delay;
}

Daniel Mack's avatar
Daniel Mack committed
65 66 67 68 69 70 71 72 73
/*
 * 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;
74 75
	if (subs->stream->chip->shutdown)
		return SNDRV_PCM_POS_XRUN;
Daniel Mack's avatar
Daniel Mack committed
76 77
	spin_lock(&subs->lock);
	hwptr_done = subs->hwptr_done;
78 79
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		substream->runtime->delay = snd_usb_pcm_delay(subs,
80
						substream->runtime->rate);
Daniel Mack's avatar
Daniel Mack committed
81 82 83 84 85 86 87
	spin_unlock(&subs->lock);
	return hwptr_done / (substream->runtime->frame_bits >> 3);
}

/*
 * find a matching audio format
 */
88
static struct audioformat *find_format(struct snd_usb_substream *subs)
Daniel Mack's avatar
Daniel Mack committed
89 90 91 92 93 94 95 96
{
	struct list_head *p;
	struct audioformat *found = NULL;
	int cur_attr = 0, attr;

	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
97
		if (!(fp->formats & (1uLL << subs->pcm_format)))
98
			continue;
99
		if (fp->channels != subs->channels)
Daniel Mack's avatar
Daniel Mack committed
100
			continue;
101 102
		if (subs->cur_rate < fp->rate_min ||
		    subs->cur_rate > fp->rate_max)
Daniel Mack's avatar
Daniel Mack committed
103 104 105 106
			continue;
		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
			unsigned int i;
			for (i = 0; i < fp->nr_rates; i++)
107
				if (fp->rate_table[i] == subs->cur_rate)
Daniel Mack's avatar
Daniel Mack committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
					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;
}

147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
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,
162
				   data, sizeof(data))) < 0) {
163 164 165 166 167 168 169
		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
170

171 172 173 174 175 176 177 178 179 180 181 182
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,
183
				   data, sizeof(data))) < 0) {
184 185 186 187 188 189 190 191
		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
192
/*
193
 * initialize the pitch control and sample rate
Daniel Mack's avatar
Daniel Mack committed
194
 */
195
int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
Daniel Mack's avatar
Daniel Mack committed
196 197 198
		       struct usb_host_interface *alts,
		       struct audioformat *fmt)
{
199 200
	struct usb_interface_descriptor *altsd = get_iface_desc(alts);

201 202 203 204
	/* if endpoint doesn't have pitch control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
		return 0;

205 206
	switch (altsd->bInterfaceProtocol) {
	case UAC_VERSION_1:
207
	default:
208 209 210
		return init_pitch_v1(chip, iface, alts, fmt);

	case UAC_VERSION_2:
211
		return init_pitch_v2(chip, iface, alts, fmt);
212 213 214
	}
}

215
static int start_endpoints(struct snd_usb_substream *subs, bool can_sleep)
216 217 218 219 220 221 222 223 224 225 226 227
{
	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;
228
		err = snd_usb_endpoint_start(ep, can_sleep);
229 230 231 232 233 234 235 236 237 238
		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;

239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
		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;
			}
		}

254 255 256
		snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);

		ep->sync_slave = subs->data_endpoint;
257
		err = snd_usb_endpoint_start(ep, can_sleep);
258 259 260 261 262 263 264 265 266
		if (err < 0) {
			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
			return err;
		}
	}

	return 0;
}

267
static void stop_endpoints(struct snd_usb_substream *subs, bool wait)
268 269
{
	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
270
		snd_usb_endpoint_stop(subs->sync_endpoint);
271 272

	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
273 274 275 276 277 278
		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);
	}
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
}

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;
}

Daniel Mack's avatar
Daniel Mack committed
297 298 299 300 301 302 303 304 305 306 307
/*
 * 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;
	unsigned int ep, attr;
	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
308
	int err, implicit_fb = 0;
Daniel Mack's avatar
Daniel Mack committed
309 310 311 312 313 314 315 316 317 318 319 320

	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;

321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347
	/* 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;
	}

348 349 350 351 352
	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;
Daniel Mack's avatar
Daniel Mack committed
353 354 355 356 357 358 359

	/* 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;
360 361 362 363 364 365

	switch (subs->stream->chip->usb_id) {
	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
	case USB_ID(0x0763, 0x2081):
		if (is_playback) {
			implicit_fb = 1;
366 367
			ep = 0x81;
			iface = usb_ifnum_to_if(dev, 2);
368 369 370 371

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

372 373 374
			alts = &iface->altsetting[1];
			goto add_sync_ep;
		}
375
	}
376

377 378 379
	if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
	     (!is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
	    altsd->bNumEndpoints >= 2) {
Daniel Mack's avatar
Daniel Mack committed
380 381 382 383 384 385
		/* 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) != 0x01 ||
		    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
386 387
		     get_endpoint(alts, 1)->bSynchAddress != 0 &&
		     !implicit_fb)) {
388 389 390 391 392
			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);
Daniel Mack's avatar
Daniel Mack committed
393 394 395
			return -EINVAL;
		}
		ep = get_endpoint(alts, 1)->bEndpointAddress;
396 397
		if (!implicit_fb &&
		    get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
Daniel Mack's avatar
Daniel Mack committed
398
		    (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
399 400 401 402
		     (!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);
Daniel Mack's avatar
Daniel Mack committed
403 404
			return -EINVAL;
		}
405 406 407 408

		implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
				== USB_ENDPOINT_USAGE_IMPLICIT_FB;

409 410 411
add_sync_ep:
		subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
							   alts, ep, !subs->direction,
412 413 414
							   implicit_fb ?
								SND_USB_ENDPOINT_TYPE_DATA :
								SND_USB_ENDPOINT_TYPE_SYNC);
415 416 417 418 419
		if (!subs->sync_endpoint)
			return -EINVAL;

		subs->data_endpoint->sync_master = subs->sync_endpoint;
	}
Daniel Mack's avatar
Daniel Mack committed
420

421
	if ((err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt)) < 0)
Daniel Mack's avatar
Daniel Mack committed
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
		return err;

	subs->cur_audiofmt = fmt;

	snd_usb_set_format_quirk(subs, fmt);

#if 0
	printk(KERN_DEBUG
	       "setting done: format = %d, rate = %d..%d, channels = %d\n",
	       fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
	printk(KERN_DEBUG
	       "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
	       subs->datapipe, subs->syncpipe);
#endif

	return 0;
}

440 441 442 443 444 445 446 447 448 449
/*
 * configure endpoint params
 *
 * called  during initial setup and upon resume
 */
static int configure_endpoint(struct snd_usb_substream *subs)
{
	int ret;

	/* format changed */
450
	stop_endpoints(subs, true);
451 452 453 454 455 456 457 458
	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)
459
		return ret;
460 461

	if (subs->sync_endpoint)
462
		ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
463 464 465 466 467 468 469 470 471
						  subs->pcm_format,
						  subs->channels,
						  subs->period_bytes,
						  subs->cur_rate,
						  subs->cur_audiofmt,
						  NULL);
	return ret;
}

Daniel Mack's avatar
Daniel Mack committed
472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
/*
 * 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;
487
	int ret;
Daniel Mack's avatar
Daniel Mack committed
488 489 490 491 492 493

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

494 495 496 497 498 499
	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
500 501
	if (!fmt) {
		snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
502
			   subs->pcm_format, subs->cur_rate, subs->channels);
Daniel Mack's avatar
Daniel Mack committed
503 504 505
		return -EINVAL;
	}

506
	down_read(&subs->stream->chip->shutdown_rwsem);
507 508 509 510
	if (subs->stream->chip->shutdown)
		ret = -ENODEV;
	else
		ret = set_format(subs, fmt);
511
	up_read(&subs->stream->chip->shutdown_rwsem);
512
	if (ret < 0)
Daniel Mack's avatar
Daniel Mack committed
513 514
		return ret;

515 516
	subs->interface = fmt->iface;
	subs->altset_idx = fmt->altset_idx;
517
	subs->need_setup_ep = true;
518

519
	return 0;
Daniel Mack's avatar
Daniel Mack committed
520 521 522 523 524 525 526 527 528 529 530 531 532 533
}

/*
 * 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;
534
	down_read(&subs->stream->chip->shutdown_rwsem);
535
	if (!subs->stream->chip->shutdown) {
536
		stop_endpoints(subs, true);
537 538
		deactivate_endpoints(subs);
	}
539
	up_read(&subs->stream->chip->shutdown_rwsem);
Daniel Mack's avatar
Daniel Mack committed
540 541 542 543 544 545 546 547 548 549 550 551
	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;
552 553 554
	struct usb_host_interface *alts;
	struct usb_interface *iface;
	int ret;
Daniel Mack's avatar
Daniel Mack committed
555 556 557 558 559 560

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

561
	down_read(&subs->stream->chip->shutdown_rwsem);
562 563 564 565 566 567 568 569
	if (subs->stream->chip->shutdown) {
		ret = -ENODEV;
		goto unlock;
	}
	if (snd_BUG_ON(!subs->data_endpoint)) {
		ret = -EIO;
		goto unlock;
	}
570

571 572 573
	snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);

574 575
	ret = set_format(subs, subs->cur_audiofmt);
	if (ret < 0)
576
		goto unlock;
577 578 579 580 581 582 583 584 585

	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)
586
		goto unlock;
587

588 589 590
	if (subs->need_setup_ep) {
		ret = configure_endpoint(subs);
		if (ret < 0)
591
			goto unlock;
592 593
		subs->need_setup_ep = false;
	}
594

Daniel Mack's avatar
Daniel Mack committed
595
	/* some unit conversions in runtime */
596 597 598 599
	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
600 601 602 603

	/* reset the pointer */
	subs->hwptr_done = 0;
	subs->transfer_done = 0;
604 605
	subs->last_delay = 0;
	subs->last_frame_number = 0;
Daniel Mack's avatar
Daniel Mack committed
606 607
	runtime->delay = 0;

608 609 610
	/* 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)
611
		ret = start_endpoints(subs, true);
612

613
 unlock:
614
	up_read(&subs->stream->chip->shutdown_rwsem);
615
	return ret;
Daniel Mack's avatar
Daniel Mack committed
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
}

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);
641
	struct snd_mask check_fmts;
Daniel Mack's avatar
Daniel Mack committed
642 643 644
	unsigned int ptime;

	/* check the format */
645 646 647 648 649
	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
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667
		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 */
668
	if (subs->speed != USB_SPEED_FULL) {
Daniel Mack's avatar
Daniel Mack committed
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
		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;
	struct list_head *p;
	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;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		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;
	struct list_head *p;
	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;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		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;
	struct list_head *p;
	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;
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		if (!hw_check_valid_format(subs, params, fp))
			continue;
802
		fbits |= fp->formats;
Daniel Mack's avatar
Daniel Mack committed
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836
	}

	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) {
837
		hwc_debug("  --> get empty\n");
Daniel Mack's avatar
Daniel Mack committed
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
		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;
863
	int *rate_list;
Daniel Mack's avatar
Daniel Mack committed
864 865 866
	int count = 0, needs_knot = 0;
	int err;

867 868 869
	kfree(subs->rate_list.list);
	subs->rate_list.list = NULL;

Daniel Mack's avatar
Daniel Mack committed
870 871 872 873 874 875 876 877 878 879
	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;

880 881
	subs->rate_list.list = rate_list =
		kmalloc(sizeof(int) * count, GFP_KERNEL);
882 883 884
	if (!subs->rate_list.list)
		return -ENOMEM;
	subs->rate_list.count = count;
Daniel Mack's avatar
Daniel Mack committed
885 886 887 888 889
	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++)
890
			rate_list[count++] = fp->rate_table[i];
Daniel Mack's avatar
Daniel Mack committed
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
	}
	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)
{
	struct list_head *p;
	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 */
	list_for_each(p, &subs->fmt_list) {
		struct audioformat *fp;
		fp = list_entry(p, struct audioformat, list);
		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);
	}
941 942 943
	err = snd_usb_autoresume(subs->stream->chip);
	if (err < 0)
		return err;
Daniel Mack's avatar
Daniel Mack committed
944 945

	param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
946
	if (subs->speed == USB_SPEED_FULL)
Daniel Mack's avatar
Daniel Mack committed
947 948 949 950 951 952 953 954 955 956 957 958 959 960
		/* 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)
961
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
962 963 964 965 966 967
	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)
968
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
969 970 971 972 973 974
	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)
975
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
976 977 978 979 980 981 982 983 984
	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)
985
			goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
986 987
	}
	if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
988
		goto rep_err;
Daniel Mack's avatar
Daniel Mack committed
989
	return 0;
990 991 992 993

rep_err:
	snd_usb_autosuspend(subs->stream->chip);
	return err;
Daniel Mack's avatar
Daniel Mack committed
994 995 996 997 998 999 1000 1001 1002
}

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;
1003
	subs->altset_idx = 0;
Daniel Mack's avatar
Daniel Mack committed
1004 1005 1006
	runtime->hw = snd_usb_hardware;
	runtime->private_data = subs;
	subs->pcm_substream = substream;
1007
	/* runtime PM is also done there */
Daniel Mack's avatar
Daniel Mack committed
1008 1009 1010 1011 1012 1013 1014 1015
	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];

1016
	stop_endpoints(subs, true);
1017 1018 1019 1020 1021 1022

	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
1023
	subs->pcm_substream = NULL;
1024
	snd_usb_autosuspend(subs->stream->chip);
1025

1026
	return 0;
1027 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 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
}

/* 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;

	stride = runtime->frame_bits >> 3;

	for (i = 0; i < urb->number_of_packets; i++) {
		cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
		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) {
#ifdef CONFIG_SND_DEBUG_VERBOSE
			int oldbytes = bytes;
#endif
			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;
		}
		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);
}

static void prepare_playback_urb(struct snd_usb_substream *subs,
				 struct urb *urb)
{
	struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
1095
	struct snd_usb_endpoint *ep = subs->data_endpoint;
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
	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++) {
1107 1108 1109 1110 1111
		if (ctx->packet_size[i])
			counts = ctx->packet_size[i];
		else
			counts = snd_usb_endpoint_next_packet_size(ep);

1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
		/* set up descriptor */
		urb->iso_frame_desc[i].offset = frames * stride;
		urb->iso_frame_desc[i].length = counts * stride;
		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 =
						counts * stride;
					subs->transfer_done = 0;
				}
				i++;
				if (i < ctx->packets) {
					/* add a transfer delimiter */
					urb->iso_frame_desc[i].offset =
						frames * stride;
					urb->iso_frame_desc[i].length = 0;
					urb->number_of_packets++;
				}
				break;
			}
		}
		if (period_elapsed &&
		    !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
			break;
	}
	bytes = frames * stride;
	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;
	if (subs->hwptr_done >= runtime->buffer_size * stride)
		subs->hwptr_done -= runtime->buffer_size * stride;
1162 1163 1164

	/* update delay with exact number of samples queued */
	runtime->delay = subs->last_delay;
1165
	runtime->delay += frames;
1166 1167 1168 1169 1170 1171
	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 */

1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	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;
	int stride = runtime->frame_bits >> 3;
	int processed = urb->transfer_buffer_length / stride;
1189
	int est_delay;
1190

1191 1192 1193 1194 1195 1196
	/* ignore the delay accounting when procssed=0 is given, i.e.
	 * silent payloads are procssed before handling the actual data
	 */
	if (!processed)
		return;

1197
	spin_lock_irqsave(&subs->lock, flags);
1198 1199 1200 1201
	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;
1202
	else
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
		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);

1215
	spin_unlock_irqrestore(&subs->lock, flags);
Daniel Mack's avatar
Daniel Mack committed
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
}

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);
}

1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
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;
1248
		subs->running = 1;
1249 1250
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1251
		stop_endpoints(subs, false);
1252
		subs->running = 0;
1253 1254 1255 1256
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->prepare_data_urb = NULL;
		subs->data_endpoint->retire_data_urb = NULL;
1257
		subs->running = 0;
1258 1259 1260 1261 1262 1263
		return 0;
	}

	return -EINVAL;
}

1264 1265
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
					     int cmd)
1266 1267 1268 1269 1270 1271
{
	int err;
	struct snd_usb_substream *subs = substream->runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
1272
		err = start_endpoints(subs, false);
1273 1274 1275 1276
		if (err < 0)
			return err;

		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1277
		subs->running = 1;
1278 1279
		return 0;
	case SNDRV_PCM_TRIGGER_STOP:
1280
		stop_endpoints(subs, false);
1281
		subs->running = 0;
1282 1283 1284
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		subs->data_endpoint->retire_data_urb = NULL;
1285
		subs->running = 0;
1286 1287 1288
		return 0;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		subs->data_endpoint->retire_data_urb = retire_capture_urb;
1289
		subs->running = 1;
1290 1291 1292 1293 1294 1295
		return 0;
	}

	return -EINVAL;
}

Daniel Mack's avatar
Daniel Mack committed
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
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);
}