1/*
   2 * Edirol UA-101/UA-1000 driver
   3 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   4 *
   5 * This driver is free software: you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License, version 2.
   7 *
   8 * This driver is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this driver.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17#include <linux/init.h>
  18#include <linux/module.h>
  19#include <linux/slab.h>
  20#include <linux/usb.h>
  21#include <linux/usb/audio.h>
  22#include <sound/core.h>
  23#include <sound/initval.h>
  24#include <sound/pcm.h>
  25#include <sound/pcm_params.h>
  26#include "../usbaudio.h"
  27#include "../midi.h"
  28
  29MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  30MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  31MODULE_LICENSE("GPL v2");
  32MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
  33
  34/*
  35 * Should not be lower than the minimum scheduling delay of the host
  36 * controller.  Some Intel controllers need more than one frame; as long as
  37 * that driver doesn't tell us about this, use 1.5 frames just to be sure.
  38 */
  39#define MIN_QUEUE_LENGTH	12
  40/* Somewhat random. */
  41#define MAX_QUEUE_LENGTH	30
  42/*
  43 * This magic value optimizes memory usage efficiency for the UA-101's packet
  44 * sizes at all sample rates, taking into account the stupid cache pool sizes
  45 * that usb_alloc_coherent() uses.
  46 */
  47#define DEFAULT_QUEUE_LENGTH	21
  48
  49#define MAX_PACKET_SIZE		672 /* hardware specific */
  50#define MAX_MEMORY_BUFFERS	DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
  51					     PAGE_SIZE / MAX_PACKET_SIZE)
  52
  53static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  54static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  55static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  56static unsigned int queue_length = 21;
  57
  58module_param_array(index, int, NULL, 0444);
  59MODULE_PARM_DESC(index, "card index");
  60module_param_array(id, charp, NULL, 0444);
  61MODULE_PARM_DESC(id, "ID string");
  62module_param_array(enable, bool, NULL, 0444);
  63MODULE_PARM_DESC(enable, "enable card");
  64module_param(queue_length, uint, 0644);
  65MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  66		 __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  67
  68enum {
  69	INTF_PLAYBACK,
  70	INTF_CAPTURE,
  71	INTF_MIDI,
  72
  73	INTF_COUNT
  74};
  75
  76/* bits in struct ua101::states */
  77enum {
  78	USB_CAPTURE_RUNNING,
  79	USB_PLAYBACK_RUNNING,
  80	ALSA_CAPTURE_OPEN,
  81	ALSA_PLAYBACK_OPEN,
  82	ALSA_CAPTURE_RUNNING,
  83	ALSA_PLAYBACK_RUNNING,
  84	CAPTURE_URB_COMPLETED,
  85	PLAYBACK_URB_COMPLETED,
  86	DISCONNECTED,
  87};
  88
  89struct ua101 {
  90	struct usb_device *dev;
  91	struct snd_card *card;
  92	struct usb_interface *intf[INTF_COUNT];
  93	int card_index;
  94	struct snd_pcm *pcm;
  95	struct list_head midi_list;
  96	u64 format_bit;
  97	unsigned int rate;
  98	unsigned int packets_per_second;
  99	spinlock_t lock;
 100	struct mutex mutex;
 101	unsigned long states;
 102
 103	/* FIFO to synchronize playback rate to capture rate */
 104	unsigned int rate_feedback_start;
 105	unsigned int rate_feedback_count;
 106	u8 rate_feedback[MAX_QUEUE_LENGTH];
 107
 108	struct list_head ready_playback_urbs;
 109	struct tasklet_struct playback_tasklet;
 110	wait_queue_head_t alsa_capture_wait;
 111	wait_queue_head_t rate_feedback_wait;
 112	wait_queue_head_t alsa_playback_wait;
 113	struct ua101_stream {
 114		struct snd_pcm_substream *substream;
 115		unsigned int usb_pipe;
 116		unsigned int channels;
 117		unsigned int frame_bytes;
 118		unsigned int max_packet_bytes;
 119		unsigned int period_pos;
 120		unsigned int buffer_pos;
 121		unsigned int queue_length;
 122		struct ua101_urb {
 123			struct urb urb;
 124			struct usb_iso_packet_descriptor iso_frame_desc[1];
 125			struct list_head ready_list;
 126		} *urbs[MAX_QUEUE_LENGTH];
 127		struct {
 128			unsigned int size;
 129			void *addr;
 130			dma_addr_t dma;
 131		} buffers[MAX_MEMORY_BUFFERS];
 132	} capture, playback;
 133};
 134
 135static DEFINE_MUTEX(devices_mutex);
 136static unsigned int devices_used;
 137static struct usb_driver ua101_driver;
 138
 139static void abort_alsa_playback(struct ua101 *ua);
 140static void abort_alsa_capture(struct ua101 *ua);
 141
 142static const char *usb_error_string(int err)
 143{
 144	switch (err) {
 145	case -ENODEV:
 146		return "no device";
 147	case -ENOENT:
 148		return "endpoint not enabled";
 149	case -EPIPE:
 150		return "endpoint stalled";
 151	case -ENOSPC:
 152		return "not enough bandwidth";
 153	case -ESHUTDOWN:
 154		return "device disabled";
 155	case -EHOSTUNREACH:
 156		return "device suspended";
 157	case -EINVAL:
 158	case -EAGAIN:
 159	case -EFBIG:
 160	case -EMSGSIZE:
 161		return "internal error";
 162	default:
 163		return "unknown error";
 164	}
 165}
 166
 167static void abort_usb_capture(struct ua101 *ua)
 168{
 169	if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 170		wake_up(&ua->alsa_capture_wait);
 171		wake_up(&ua->rate_feedback_wait);
 172	}
 173}
 174
 175static void abort_usb_playback(struct ua101 *ua)
 176{
 177	if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
 178		wake_up(&ua->alsa_playback_wait);
 179}
 180
 181static void playback_urb_complete(struct urb *usb_urb)
 182{
 183	struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
 184	struct ua101 *ua = urb->urb.context;
 185	unsigned long flags;
 186
 187	if (unlikely(urb->urb.status == -ENOENT ||	/* unlinked */
 188		     urb->urb.status == -ENODEV ||	/* device removed */
 189		     urb->urb.status == -ECONNRESET ||	/* unlinked */
 190		     urb->urb.status == -ESHUTDOWN)) {	/* device disabled */
 191		abort_usb_playback(ua);
 192		abort_alsa_playback(ua);
 193		return;
 194	}
 195
 196	if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
 197		/* append URB to FIFO */
 198		spin_lock_irqsave(&ua->lock, flags);
 199		list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
 200		if (ua->rate_feedback_count > 0)
 201			tasklet_schedule(&ua->playback_tasklet);
 202		ua->playback.substream->runtime->delay -=
 203				urb->urb.iso_frame_desc[0].length /
 204						ua->playback.frame_bytes;
 205		spin_unlock_irqrestore(&ua->lock, flags);
 206	}
 207}
 208
 209static void first_playback_urb_complete(struct urb *urb)
 210{
 211	struct ua101 *ua = urb->context;
 212
 213	urb->complete = playback_urb_complete;
 214	playback_urb_complete(urb);
 215
 216	set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 217	wake_up(&ua->alsa_playback_wait);
 218}
 219
 220/* copy data from the ALSA ring buffer into the URB buffer */
 221static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
 222			       unsigned int frames)
 223{
 224	struct snd_pcm_runtime *runtime;
 225	unsigned int frame_bytes, frames1;
 226	const u8 *source;
 227
 228	runtime = stream->substream->runtime;
 229	frame_bytes = stream->frame_bytes;
 230	source = runtime->dma_area + stream->buffer_pos * frame_bytes;
 231	if (stream->buffer_pos + frames <= runtime->buffer_size) {
 232		memcpy(urb->transfer_buffer, source, frames * frame_bytes);
 233	} else {
 234		/* wrap around at end of ring buffer */
 235		frames1 = runtime->buffer_size - stream->buffer_pos;
 236		memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
 237		memcpy(urb->transfer_buffer + frames1 * frame_bytes,
 238		       runtime->dma_area, (frames - frames1) * frame_bytes);
 239	}
 240
 241	stream->buffer_pos += frames;
 242	if (stream->buffer_pos >= runtime->buffer_size)
 243		stream->buffer_pos -= runtime->buffer_size;
 244	stream->period_pos += frames;
 245	if (stream->period_pos >= runtime->period_size) {
 246		stream->period_pos -= runtime->period_size;
 247		return true;
 248	}
 249	return false;
 250}
 251
 252static inline void add_with_wraparound(struct ua101 *ua,
 253				       unsigned int *value, unsigned int add)
 254{
 255	*value += add;
 256	if (*value >= ua->playback.queue_length)
 257		*value -= ua->playback.queue_length;
 258}
 259
 260static void playback_tasklet(unsigned long data)
 261{
 262	struct ua101 *ua = (void *)data;
 263	unsigned long flags;
 264	unsigned int frames;
 265	struct ua101_urb *urb;
 266	bool do_period_elapsed = false;
 267	int err;
 268
 269	if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
 270		return;
 271
 272	/*
 273	 * Synchronizing the playback rate to the capture rate is done by using
 274	 * the same sequence of packet sizes for both streams.
 275	 * Submitting a playback URB therefore requires both a ready URB and
 276	 * the size of the corresponding capture packet, i.e., both playback
 277	 * and capture URBs must have been completed.  Since the USB core does
 278	 * not guarantee that playback and capture complete callbacks are
 279	 * called alternately, we use two FIFOs for packet sizes and read URBs;
 280	 * submitting playback URBs is possible as long as both FIFOs are
 281	 * nonempty.
 282	 */
 283	spin_lock_irqsave(&ua->lock, flags);
 284	while (ua->rate_feedback_count > 0 &&
 285	       !list_empty(&ua->ready_playback_urbs)) {
 286		/* take packet size out of FIFO */
 287		frames = ua->rate_feedback[ua->rate_feedback_start];
 288		add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 289		ua->rate_feedback_count--;
 290
 291		/* take URB out of FIFO */
 292		urb = list_first_entry(&ua->ready_playback_urbs,
 293				       struct ua101_urb, ready_list);
 294		list_del(&urb->ready_list);
 295
 296		/* fill packet with data or silence */
 297		urb->urb.iso_frame_desc[0].length =
 298			frames * ua->playback.frame_bytes;
 299		if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 300			do_period_elapsed |= copy_playback_data(&ua->playback,
 301								&urb->urb,
 302								frames);
 303		else
 304			memset(urb->urb.transfer_buffer, 0,
 305			       urb->urb.iso_frame_desc[0].length);
 306
 307		/* and off you go ... */
 308		err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
 309		if (unlikely(err < 0)) {
 310			spin_unlock_irqrestore(&ua->lock, flags);
 311			abort_usb_playback(ua);
 312			abort_alsa_playback(ua);
 313			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 314				err, usb_error_string(err));
 315			return;
 316		}
 317		ua->playback.substream->runtime->delay += frames;
 318	}
 319	spin_unlock_irqrestore(&ua->lock, flags);
 320	if (do_period_elapsed)
 321		snd_pcm_period_elapsed(ua->playback.substream);
 322}
 323
 324/* copy data from the URB buffer into the ALSA ring buffer */
 325static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
 326			      unsigned int frames)
 327{
 328	struct snd_pcm_runtime *runtime;
 329	unsigned int frame_bytes, frames1;
 330	u8 *dest;
 331
 332	runtime = stream->substream->runtime;
 333	frame_bytes = stream->frame_bytes;
 334	dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
 335	if (stream->buffer_pos + frames <= runtime->buffer_size) {
 336		memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
 337	} else {
 338		/* wrap around at end of ring buffer */
 339		frames1 = runtime->buffer_size - stream->buffer_pos;
 340		memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
 341		memcpy(runtime->dma_area,
 342		       urb->transfer_buffer + frames1 * frame_bytes,
 343		       (frames - frames1) * frame_bytes);
 344	}
 345
 346	stream->buffer_pos += frames;
 347	if (stream->buffer_pos >= runtime->buffer_size)
 348		stream->buffer_pos -= runtime->buffer_size;
 349	stream->period_pos += frames;
 350	if (stream->period_pos >= runtime->period_size) {
 351		stream->period_pos -= runtime->period_size;
 352		return true;
 353	}
 354	return false;
 355}
 356
 357static void capture_urb_complete(struct urb *urb)
 358{
 359	struct ua101 *ua = urb->context;
 360	struct ua101_stream *stream = &ua->capture;
 361	unsigned long flags;
 362	unsigned int frames, write_ptr;
 363	bool do_period_elapsed;
 364	int err;
 365
 366	if (unlikely(urb->status == -ENOENT ||		/* unlinked */
 367		     urb->status == -ENODEV ||		/* device removed */
 368		     urb->status == -ECONNRESET ||	/* unlinked */
 369		     urb->status == -ESHUTDOWN))	/* device disabled */
 370		goto stream_stopped;
 371
 372	if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
 373		frames = urb->iso_frame_desc[0].actual_length /
 374			stream->frame_bytes;
 375	else
 376		frames = 0;
 377
 378	spin_lock_irqsave(&ua->lock, flags);
 379
 380	if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 381		do_period_elapsed = copy_capture_data(stream, urb, frames);
 382	else
 383		do_period_elapsed = false;
 384
 385	if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 386		err = usb_submit_urb(urb, GFP_ATOMIC);
 387		if (unlikely(err < 0)) {
 388			spin_unlock_irqrestore(&ua->lock, flags);
 389			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 390				err, usb_error_string(err));
 391			goto stream_stopped;
 392		}
 393
 394		/* append packet size to FIFO */
 395		write_ptr = ua->rate_feedback_start;
 396		add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
 397		ua->rate_feedback[write_ptr] = frames;
 398		if (ua->rate_feedback_count < ua->playback.queue_length) {
 399			ua->rate_feedback_count++;
 400			if (ua->rate_feedback_count ==
 401						ua->playback.queue_length)
 402				wake_up(&ua->rate_feedback_wait);
 403		} else {
 404			/*
 405			 * Ring buffer overflow; this happens when the playback
 406			 * stream is not running.  Throw away the oldest entry,
 407			 * so that the playback stream, when it starts, sees
 408			 * the most recent packet sizes.
 409			 */
 410			add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 411		}
 412		if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
 413		    !list_empty(&ua->ready_playback_urbs))
 414			tasklet_schedule(&ua->playback_tasklet);
 415	}
 416
 417	spin_unlock_irqrestore(&ua->lock, flags);
 418
 419	if (do_period_elapsed)
 420		snd_pcm_period_elapsed(stream->substream);
 421
 422	return;
 423
 424stream_stopped:
 425	abort_usb_playback(ua);
 426	abort_usb_capture(ua);
 427	abort_alsa_playback(ua);
 428	abort_alsa_capture(ua);
 429}
 430
 431static void first_capture_urb_complete(struct urb *urb)
 432{
 433	struct ua101 *ua = urb->context;
 434
 435	urb->complete = capture_urb_complete;
 436	capture_urb_complete(urb);
 437
 438	set_bit(CAPTURE_URB_COMPLETED, &ua->states);
 439	wake_up(&ua->alsa_capture_wait);
 440}
 441
 442static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
 443{
 444	unsigned int i;
 445
 446	for (i = 0; i < stream->queue_length; ++i) {
 447		int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
 448		if (err < 0) {
 449			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 450				err, usb_error_string(err));
 451			return err;
 452		}
 453	}
 454	return 0;
 455}
 456
 457static void kill_stream_urbs(struct ua101_stream *stream)
 458{
 459	unsigned int i;
 460
 461	for (i = 0; i < stream->queue_length; ++i)
 462		usb_kill_urb(&stream->urbs[i]->urb);
 
 463}
 464
 465static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 466{
 467	struct usb_host_interface *alts;
 468
 469	alts = ua->intf[intf_index]->cur_altsetting;
 470	if (alts->desc.bAlternateSetting != 1) {
 471		int err = usb_set_interface(ua->dev,
 472					    alts->desc.bInterfaceNumber, 1);
 473		if (err < 0) {
 474			dev_err(&ua->dev->dev,
 475				"cannot initialize interface; error %d: %s\n",
 476				err, usb_error_string(err));
 477			return err;
 478		}
 479	}
 480	return 0;
 481}
 482
 483static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 484{
 485	struct usb_host_interface *alts;
 486
 
 
 
 487	alts = ua->intf[intf_index]->cur_altsetting;
 488	if (alts->desc.bAlternateSetting != 0) {
 489		int err = usb_set_interface(ua->dev,
 490					    alts->desc.bInterfaceNumber, 0);
 491		if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 492			dev_warn(&ua->dev->dev,
 493				 "interface reset failed; error %d: %s\n",
 494				 err, usb_error_string(err));
 495	}
 496}
 497
 498static void stop_usb_capture(struct ua101 *ua)
 499{
 500	clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 501
 502	kill_stream_urbs(&ua->capture);
 503
 504	disable_iso_interface(ua, INTF_CAPTURE);
 505}
 506
 507static int start_usb_capture(struct ua101 *ua)
 508{
 509	int err;
 510
 511	if (test_bit(DISCONNECTED, &ua->states))
 512		return -ENODEV;
 513
 514	if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 515		return 0;
 516
 517	kill_stream_urbs(&ua->capture);
 518
 519	err = enable_iso_interface(ua, INTF_CAPTURE);
 520	if (err < 0)
 521		return err;
 522
 523	clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 524	ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 525	ua->rate_feedback_start = 0;
 526	ua->rate_feedback_count = 0;
 527
 528	set_bit(USB_CAPTURE_RUNNING, &ua->states);
 529	err = submit_stream_urbs(ua, &ua->capture);
 530	if (err < 0)
 531		stop_usb_capture(ua);
 532	return err;
 533}
 534
 535static void stop_usb_playback(struct ua101 *ua)
 536{
 537	clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 538
 539	kill_stream_urbs(&ua->playback);
 540
 541	tasklet_kill(&ua->playback_tasklet);
 542
 543	disable_iso_interface(ua, INTF_PLAYBACK);
 544}
 545
 546static int start_usb_playback(struct ua101 *ua)
 547{
 548	unsigned int i, frames;
 549	struct urb *urb;
 550	int err = 0;
 551
 552	if (test_bit(DISCONNECTED, &ua->states))
 553		return -ENODEV;
 554
 555	if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 556		return 0;
 557
 558	kill_stream_urbs(&ua->playback);
 559	tasklet_kill(&ua->playback_tasklet);
 560
 561	err = enable_iso_interface(ua, INTF_PLAYBACK);
 562	if (err < 0)
 563		return err;
 564
 565	clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 566	ua->playback.urbs[0]->urb.complete =
 567		first_playback_urb_complete;
 568	spin_lock_irq(&ua->lock);
 569	INIT_LIST_HEAD(&ua->ready_playback_urbs);
 570	spin_unlock_irq(&ua->lock);
 571
 572	/*
 573	 * We submit the initial URBs all at once, so we have to wait for the
 574	 * packet size FIFO to be full.
 575	 */
 576	wait_event(ua->rate_feedback_wait,
 577		   ua->rate_feedback_count >= ua->playback.queue_length ||
 578		   !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 579		   test_bit(DISCONNECTED, &ua->states));
 580	if (test_bit(DISCONNECTED, &ua->states)) {
 581		stop_usb_playback(ua);
 582		return -ENODEV;
 583	}
 584	if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 585		stop_usb_playback(ua);
 586		return -EIO;
 587	}
 588
 589	for (i = 0; i < ua->playback.queue_length; ++i) {
 590		/* all initial URBs contain silence */
 591		spin_lock_irq(&ua->lock);
 592		frames = ua->rate_feedback[ua->rate_feedback_start];
 593		add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 594		ua->rate_feedback_count--;
 595		spin_unlock_irq(&ua->lock);
 596		urb = &ua->playback.urbs[i]->urb;
 597		urb->iso_frame_desc[0].length =
 598			frames * ua->playback.frame_bytes;
 599		memset(urb->transfer_buffer, 0,
 600		       urb->iso_frame_desc[0].length);
 601	}
 602
 603	set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 604	err = submit_stream_urbs(ua, &ua->playback);
 605	if (err < 0)
 606		stop_usb_playback(ua);
 607	return err;
 608}
 609
 610static void abort_alsa_capture(struct ua101 *ua)
 611{
 612	if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 613		snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
 614}
 615
 616static void abort_alsa_playback(struct ua101 *ua)
 617{
 618	if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 619		snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
 620}
 621
 622static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 623			 unsigned int channels)
 624{
 625	int err;
 626
 627	substream->runtime->hw.info =
 628		SNDRV_PCM_INFO_MMAP |
 629		SNDRV_PCM_INFO_MMAP_VALID |
 630		SNDRV_PCM_INFO_BATCH |
 631		SNDRV_PCM_INFO_INTERLEAVED |
 632		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 633		SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 634	substream->runtime->hw.formats = ua->format_bit;
 635	substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 636	substream->runtime->hw.rate_min = ua->rate;
 637	substream->runtime->hw.rate_max = ua->rate;
 638	substream->runtime->hw.channels_min = channels;
 639	substream->runtime->hw.channels_max = channels;
 640	substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 641	substream->runtime->hw.period_bytes_min = 1;
 642	substream->runtime->hw.period_bytes_max = UINT_MAX;
 643	substream->runtime->hw.periods_min = 2;
 644	substream->runtime->hw.periods_max = UINT_MAX;
 645	err = snd_pcm_hw_constraint_minmax(substream->runtime,
 646					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 647					   1500000 / ua->packets_per_second,
 648					   UINT_MAX);
 649	if (err < 0)
 650		return err;
 651	err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 652	return err;
 653}
 654
 655static int capture_pcm_open(struct snd_pcm_substream *substream)
 656{
 657	struct ua101 *ua = substream->private_data;
 658	int err;
 659
 660	ua->capture.substream = substream;
 661	err = set_stream_hw(ua, substream, ua->capture.channels);
 662	if (err < 0)
 663		return err;
 664	substream->runtime->hw.fifo_size =
 665		DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 666	substream->runtime->delay = substream->runtime->hw.fifo_size;
 667
 668	mutex_lock(&ua->mutex);
 669	err = start_usb_capture(ua);
 670	if (err >= 0)
 671		set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 672	mutex_unlock(&ua->mutex);
 673	return err;
 674}
 675
 676static int playback_pcm_open(struct snd_pcm_substream *substream)
 677{
 678	struct ua101 *ua = substream->private_data;
 679	int err;
 680
 681	ua->playback.substream = substream;
 682	err = set_stream_hw(ua, substream, ua->playback.channels);
 683	if (err < 0)
 684		return err;
 685	substream->runtime->hw.fifo_size =
 686		DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 687				  ua->packets_per_second);
 688
 689	mutex_lock(&ua->mutex);
 690	err = start_usb_capture(ua);
 691	if (err < 0)
 692		goto error;
 693	err = start_usb_playback(ua);
 694	if (err < 0) {
 695		if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 696			stop_usb_capture(ua);
 697		goto error;
 698	}
 699	set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 700error:
 701	mutex_unlock(&ua->mutex);
 702	return err;
 703}
 704
 705static int capture_pcm_close(struct snd_pcm_substream *substream)
 706{
 707	struct ua101 *ua = substream->private_data;
 708
 709	mutex_lock(&ua->mutex);
 710	clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 711	if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 712		stop_usb_capture(ua);
 713	mutex_unlock(&ua->mutex);
 714	return 0;
 715}
 716
 717static int playback_pcm_close(struct snd_pcm_substream *substream)
 718{
 719	struct ua101 *ua = substream->private_data;
 720
 721	mutex_lock(&ua->mutex);
 722	stop_usb_playback(ua);
 723	clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 724	if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 725		stop_usb_capture(ua);
 726	mutex_unlock(&ua->mutex);
 727	return 0;
 728}
 729
 730static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 731				 struct snd_pcm_hw_params *hw_params)
 732{
 733	struct ua101 *ua = substream->private_data;
 734	int err;
 735
 736	mutex_lock(&ua->mutex);
 737	err = start_usb_capture(ua);
 738	mutex_unlock(&ua->mutex);
 739	if (err < 0)
 740		return err;
 741
 742	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 743						params_buffer_bytes(hw_params));
 744}
 745
 746static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 747				  struct snd_pcm_hw_params *hw_params)
 748{
 749	struct ua101 *ua = substream->private_data;
 750	int err;
 751
 752	mutex_lock(&ua->mutex);
 753	err = start_usb_capture(ua);
 754	if (err >= 0)
 755		err = start_usb_playback(ua);
 756	mutex_unlock(&ua->mutex);
 757	if (err < 0)
 758		return err;
 759
 760	return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 761						params_buffer_bytes(hw_params));
 762}
 763
 764static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 765{
 766	return snd_pcm_lib_free_vmalloc_buffer(substream);
 767}
 768
 769static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 770{
 771	struct ua101 *ua = substream->private_data;
 772	int err;
 773
 774	mutex_lock(&ua->mutex);
 775	err = start_usb_capture(ua);
 776	mutex_unlock(&ua->mutex);
 777	if (err < 0)
 778		return err;
 779
 780	/*
 781	 * The EHCI driver schedules the first packet of an iso stream at 10 ms
 782	 * in the future, i.e., no data is actually captured for that long.
 783	 * Take the wait here so that the stream is known to be actually
 784	 * running when the start trigger has been called.
 785	 */
 786	wait_event(ua->alsa_capture_wait,
 787		   test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 788		   !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 789	if (test_bit(DISCONNECTED, &ua->states))
 790		return -ENODEV;
 791	if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 792		return -EIO;
 793
 794	ua->capture.period_pos = 0;
 795	ua->capture.buffer_pos = 0;
 796	return 0;
 797}
 798
 799static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 800{
 801	struct ua101 *ua = substream->private_data;
 802	int err;
 803
 804	mutex_lock(&ua->mutex);
 805	err = start_usb_capture(ua);
 806	if (err >= 0)
 807		err = start_usb_playback(ua);
 808	mutex_unlock(&ua->mutex);
 809	if (err < 0)
 810		return err;
 811
 812	/* see the comment in capture_pcm_prepare() */
 813	wait_event(ua->alsa_playback_wait,
 814		   test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 815		   !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 816	if (test_bit(DISCONNECTED, &ua->states))
 817		return -ENODEV;
 818	if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 819		return -EIO;
 820
 821	substream->runtime->delay = 0;
 822	ua->playback.period_pos = 0;
 823	ua->playback.buffer_pos = 0;
 824	return 0;
 825}
 826
 827static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 828{
 829	struct ua101 *ua = substream->private_data;
 830
 831	switch (cmd) {
 832	case SNDRV_PCM_TRIGGER_START:
 833		if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 834			return -EIO;
 835		set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 836		return 0;
 837	case SNDRV_PCM_TRIGGER_STOP:
 838		clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 839		return 0;
 840	default:
 841		return -EINVAL;
 842	}
 843}
 844
 845static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 846{
 847	struct ua101 *ua = substream->private_data;
 848
 849	switch (cmd) {
 850	case SNDRV_PCM_TRIGGER_START:
 851		if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 852			return -EIO;
 853		set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 854		return 0;
 855	case SNDRV_PCM_TRIGGER_STOP:
 856		clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 857		return 0;
 858	default:
 859		return -EINVAL;
 860	}
 861}
 862
 863static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 864						  struct ua101_stream *stream)
 865{
 866	unsigned long flags;
 867	unsigned int pos;
 868
 869	spin_lock_irqsave(&ua->lock, flags);
 870	pos = stream->buffer_pos;
 871	spin_unlock_irqrestore(&ua->lock, flags);
 872	return pos;
 873}
 874
 875static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 876{
 877	struct ua101 *ua = subs->private_data;
 878
 879	return ua101_pcm_pointer(ua, &ua->capture);
 880}
 881
 882static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 883{
 884	struct ua101 *ua = subs->private_data;
 885
 886	return ua101_pcm_pointer(ua, &ua->playback);
 887}
 888
 889static struct snd_pcm_ops capture_pcm_ops = {
 890	.open = capture_pcm_open,
 891	.close = capture_pcm_close,
 892	.ioctl = snd_pcm_lib_ioctl,
 893	.hw_params = capture_pcm_hw_params,
 894	.hw_free = ua101_pcm_hw_free,
 895	.prepare = capture_pcm_prepare,
 896	.trigger = capture_pcm_trigger,
 897	.pointer = capture_pcm_pointer,
 898	.page = snd_pcm_lib_get_vmalloc_page,
 899	.mmap = snd_pcm_lib_mmap_vmalloc,
 900};
 901
 902static struct snd_pcm_ops playback_pcm_ops = {
 903	.open = playback_pcm_open,
 904	.close = playback_pcm_close,
 905	.ioctl = snd_pcm_lib_ioctl,
 906	.hw_params = playback_pcm_hw_params,
 907	.hw_free = ua101_pcm_hw_free,
 908	.prepare = playback_pcm_prepare,
 909	.trigger = playback_pcm_trigger,
 910	.pointer = playback_pcm_pointer,
 911	.page = snd_pcm_lib_get_vmalloc_page,
 912	.mmap = snd_pcm_lib_mmap_vmalloc,
 913};
 914
 915static const struct uac_format_type_i_discrete_descriptor *
 916find_format_descriptor(struct usb_interface *interface)
 917{
 918	struct usb_host_interface *alt;
 919	u8 *extra;
 920	int extralen;
 921
 922	if (interface->num_altsetting != 2) {
 923		dev_err(&interface->dev, "invalid num_altsetting\n");
 924		return NULL;
 925	}
 926
 927	alt = &interface->altsetting[0];
 928	if (alt->desc.bNumEndpoints != 0) {
 929		dev_err(&interface->dev, "invalid bNumEndpoints\n");
 930		return NULL;
 931	}
 932
 933	alt = &interface->altsetting[1];
 934	if (alt->desc.bNumEndpoints != 1) {
 935		dev_err(&interface->dev, "invalid bNumEndpoints\n");
 936		return NULL;
 937	}
 938
 939	extra = alt->extra;
 940	extralen = alt->extralen;
 941	while (extralen >= sizeof(struct usb_descriptor_header)) {
 942		struct uac_format_type_i_discrete_descriptor *desc;
 943
 944		desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 945		if (desc->bLength > extralen) {
 946			dev_err(&interface->dev, "descriptor overflow\n");
 947			return NULL;
 948		}
 949		if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 950		    desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 951		    desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 952			if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 953			    desc->bSamFreqType != 1) {
 954				dev_err(&interface->dev,
 955					"invalid format type\n");
 956				return NULL;
 957			}
 958			return desc;
 959		}
 960		extralen -= desc->bLength;
 961		extra += desc->bLength;
 962	}
 963	dev_err(&interface->dev, "sample format descriptor not found\n");
 964	return NULL;
 965}
 966
 967static int detect_usb_format(struct ua101 *ua)
 968{
 969	const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 970	const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 971	const struct usb_endpoint_descriptor *epd;
 972	unsigned int rate2;
 973
 974	fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 975	fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 976	if (!fmt_capture || !fmt_playback)
 977		return -ENXIO;
 978
 979	switch (fmt_capture->bSubframeSize) {
 980	case 3:
 981		ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 982		break;
 983	case 4:
 984		ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 985		break;
 986	default:
 987		dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 988		return -ENXIO;
 989	}
 990	if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 991		dev_err(&ua->dev->dev,
 992			"playback/capture sample widths do not match\n");
 993		return -ENXIO;
 994	}
 995
 996	if (fmt_capture->bBitResolution != 24 ||
 997	    fmt_playback->bBitResolution != 24) {
 998		dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
 999		return -ENXIO;
1000	}
1001
1002	ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1003	rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1004	if (ua->rate != rate2) {
1005		dev_err(&ua->dev->dev,
1006			"playback/capture rates do not match: %u/%u\n",
1007			rate2, ua->rate);
1008		return -ENXIO;
1009	}
1010
1011	switch (ua->dev->speed) {
1012	case USB_SPEED_FULL:
1013		ua->packets_per_second = 1000;
1014		break;
1015	case USB_SPEED_HIGH:
1016		ua->packets_per_second = 8000;
1017		break;
1018	default:
1019		dev_err(&ua->dev->dev, "unknown device speed\n");
1020		return -ENXIO;
1021	}
1022
1023	ua->capture.channels = fmt_capture->bNrChannels;
1024	ua->playback.channels = fmt_playback->bNrChannels;
1025	ua->capture.frame_bytes =
1026		fmt_capture->bSubframeSize * ua->capture.channels;
1027	ua->playback.frame_bytes =
1028		fmt_playback->bSubframeSize * ua->playback.channels;
1029
1030	epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1031	if (!usb_endpoint_is_isoc_in(epd)) {
1032		dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1033		return -ENXIO;
1034	}
1035	ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1036	ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1037
1038	epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1039	if (!usb_endpoint_is_isoc_out(epd)) {
1040		dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1041		return -ENXIO;
1042	}
1043	ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1044	ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1045	return 0;
1046}
1047
1048static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1049{
1050	unsigned int remaining_packets, packets, packets_per_page, i;
1051	size_t size;
1052
1053	stream->queue_length = queue_length;
1054	stream->queue_length = max(stream->queue_length,
1055				   (unsigned int)MIN_QUEUE_LENGTH);
1056	stream->queue_length = min(stream->queue_length,
1057				   (unsigned int)MAX_QUEUE_LENGTH);
1058
1059	/*
1060	 * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1061	 * quite bad when used with the packet sizes of this device (e.g. 280,
1062	 * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1063	 * a smaller buffer only for the last chunk.
1064	 */
1065	remaining_packets = stream->queue_length;
1066	packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1067	for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1068		packets = min(remaining_packets, packets_per_page);
1069		size = packets * stream->max_packet_bytes;
1070		stream->buffers[i].addr =
1071			usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1072					   &stream->buffers[i].dma);
1073		if (!stream->buffers[i].addr)
1074			return -ENOMEM;
1075		stream->buffers[i].size = size;
1076		remaining_packets -= packets;
1077		if (!remaining_packets)
1078			break;
1079	}
1080	if (remaining_packets) {
1081		dev_err(&ua->dev->dev, "too many packets\n");
1082		return -ENXIO;
1083	}
1084	return 0;
1085}
1086
1087static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1088{
1089	unsigned int i;
1090
1091	for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1092		usb_free_coherent(ua->dev,
1093				  stream->buffers[i].size,
1094				  stream->buffers[i].addr,
1095				  stream->buffers[i].dma);
1096}
1097
1098static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1099			     void (*urb_complete)(struct urb *))
1100{
1101	unsigned max_packet_size = stream->max_packet_bytes;
1102	struct ua101_urb *urb;
1103	unsigned int b, u = 0;
1104
1105	for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1106		unsigned int size = stream->buffers[b].size;
1107		u8 *addr = stream->buffers[b].addr;
1108		dma_addr_t dma = stream->buffers[b].dma;
1109
1110		while (size >= max_packet_size) {
1111			if (u >= stream->queue_length)
1112				goto bufsize_error;
1113			urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1114			if (!urb)
1115				return -ENOMEM;
1116			usb_init_urb(&urb->urb);
1117			urb->urb.dev = ua->dev;
1118			urb->urb.pipe = stream->usb_pipe;
1119			urb->urb.transfer_flags = URB_ISO_ASAP |
1120					URB_NO_TRANSFER_DMA_MAP;
1121			urb->urb.transfer_buffer = addr;
1122			urb->urb.transfer_dma = dma;
1123			urb->urb.transfer_buffer_length = max_packet_size;
1124			urb->urb.number_of_packets = 1;
1125			urb->urb.interval = 1;
1126			urb->urb.context = ua;
1127			urb->urb.complete = urb_complete;
1128			urb->urb.iso_frame_desc[0].offset = 0;
1129			urb->urb.iso_frame_desc[0].length = max_packet_size;
1130			stream->urbs[u++] = urb;
1131			size -= max_packet_size;
1132			addr += max_packet_size;
1133			dma += max_packet_size;
1134		}
1135	}
1136	if (u == stream->queue_length)
1137		return 0;
1138bufsize_error:
1139	dev_err(&ua->dev->dev, "internal buffer size error\n");
1140	return -ENXIO;
1141}
1142
1143static void free_stream_urbs(struct ua101_stream *stream)
1144{
1145	unsigned int i;
1146
1147	for (i = 0; i < stream->queue_length; ++i)
1148		kfree(stream->urbs[i]);
 
 
1149}
1150
1151static void free_usb_related_resources(struct ua101 *ua,
1152				       struct usb_interface *interface)
1153{
1154	unsigned int i;
 
1155
 
1156	free_stream_urbs(&ua->capture);
1157	free_stream_urbs(&ua->playback);
 
1158	free_stream_buffers(ua, &ua->capture);
1159	free_stream_buffers(ua, &ua->playback);
1160
1161	for (i = 0; i < ARRAY_SIZE(ua->intf); ++i)
1162		if (ua->intf[i]) {
1163			usb_set_intfdata(ua->intf[i], NULL);
1164			if (ua->intf[i] != interface)
 
 
 
 
1165				usb_driver_release_interface(&ua101_driver,
1166							     ua->intf[i]);
1167		}
 
1168}
1169
1170static void ua101_card_free(struct snd_card *card)
1171{
1172	struct ua101 *ua = card->private_data;
1173
1174	mutex_destroy(&ua->mutex);
1175}
1176
1177static int ua101_probe(struct usb_interface *interface,
1178		       const struct usb_device_id *usb_id)
1179{
1180	static const struct snd_usb_midi_endpoint_info midi_ep = {
1181		.out_cables = 0x0001,
1182		.in_cables = 0x0001
1183	};
1184	static const struct snd_usb_audio_quirk midi_quirk = {
1185		.type = QUIRK_MIDI_FIXED_ENDPOINT,
1186		.data = &midi_ep
1187	};
1188	static const int intf_numbers[2][3] = {
1189		{	/* UA-101 */
1190			[INTF_PLAYBACK] = 0,
1191			[INTF_CAPTURE] = 1,
1192			[INTF_MIDI] = 2,
1193		},
1194		{	/* UA-1000 */
1195			[INTF_CAPTURE] = 1,
1196			[INTF_PLAYBACK] = 2,
1197			[INTF_MIDI] = 3,
1198		},
1199	};
1200	struct snd_card *card;
1201	struct ua101 *ua;
1202	unsigned int card_index, i;
1203	int is_ua1000;
1204	const char *name;
1205	char usb_path[32];
1206	int err;
1207
1208	is_ua1000 = usb_id->idProduct == 0x0044;
1209
1210	if (interface->altsetting->desc.bInterfaceNumber !=
1211	    intf_numbers[is_ua1000][0])
1212		return -ENODEV;
1213
1214	mutex_lock(&devices_mutex);
1215
1216	for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1217		if (enable[card_index] && !(devices_used & (1 << card_index)))
1218			break;
1219	if (card_index >= SNDRV_CARDS) {
1220		mutex_unlock(&devices_mutex);
1221		return -ENOENT;
1222	}
1223	err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1224			      sizeof(*ua), &card);
 
1225	if (err < 0) {
1226		mutex_unlock(&devices_mutex);
1227		return err;
1228	}
1229	card->private_free = ua101_card_free;
1230	ua = card->private_data;
1231	ua->dev = interface_to_usbdev(interface);
1232	ua->card = card;
1233	ua->card_index = card_index;
1234	INIT_LIST_HEAD(&ua->midi_list);
1235	spin_lock_init(&ua->lock);
1236	mutex_init(&ua->mutex);
1237	INIT_LIST_HEAD(&ua->ready_playback_urbs);
1238	tasklet_init(&ua->playback_tasklet,
1239		     playback_tasklet, (unsigned long)ua);
1240	init_waitqueue_head(&ua->alsa_capture_wait);
1241	init_waitqueue_head(&ua->rate_feedback_wait);
1242	init_waitqueue_head(&ua->alsa_playback_wait);
1243
1244	ua->intf[0] = interface;
1245	for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1246		ua->intf[i] = usb_ifnum_to_if(ua->dev,
1247					      intf_numbers[is_ua1000][i]);
1248		if (!ua->intf[i]) {
1249			dev_err(&ua->dev->dev, "interface %u not found\n",
1250				intf_numbers[is_ua1000][i]);
1251			err = -ENXIO;
1252			goto probe_error;
1253		}
1254		err = usb_driver_claim_interface(&ua101_driver,
1255						 ua->intf[i], ua);
1256		if (err < 0) {
1257			ua->intf[i] = NULL;
1258			err = -EBUSY;
1259			goto probe_error;
1260		}
1261	}
1262
1263	snd_card_set_dev(card, &interface->dev);
1264
1265	err = detect_usb_format(ua);
1266	if (err < 0)
1267		goto probe_error;
1268
1269	name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1270	strcpy(card->driver, "UA-101");
1271	strcpy(card->shortname, name);
1272	usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1273	snprintf(ua->card->longname, sizeof(ua->card->longname),
1274		 "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1275		 ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1276		 ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1277
1278	err = alloc_stream_buffers(ua, &ua->capture);
1279	if (err < 0)
1280		goto probe_error;
1281	err = alloc_stream_buffers(ua, &ua->playback);
1282	if (err < 0)
1283		goto probe_error;
1284
1285	err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1286	if (err < 0)
1287		goto probe_error;
1288	err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1289	if (err < 0)
1290		goto probe_error;
1291
1292	err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1293	if (err < 0)
1294		goto probe_error;
1295	ua->pcm->private_data = ua;
1296	strcpy(ua->pcm->name, name);
1297	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1298	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1299
1300	err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1301				 &ua->midi_list, &midi_quirk);
1302	if (err < 0)
1303		goto probe_error;
1304
1305	err = snd_card_register(card);
1306	if (err < 0)
1307		goto probe_error;
1308
1309	usb_set_intfdata(interface, ua);
1310	devices_used |= 1 << card_index;
1311
1312	mutex_unlock(&devices_mutex);
1313	return 0;
1314
1315probe_error:
1316	free_usb_related_resources(ua, interface);
1317	snd_card_free(card);
1318	mutex_unlock(&devices_mutex);
1319	return err;
1320}
1321
1322static void ua101_disconnect(struct usb_interface *interface)
1323{
1324	struct ua101 *ua = usb_get_intfdata(interface);
1325	struct list_head *midi;
1326
1327	if (!ua)
1328		return;
1329
1330	mutex_lock(&devices_mutex);
1331
1332	set_bit(DISCONNECTED, &ua->states);
1333	wake_up(&ua->rate_feedback_wait);
1334
1335	/* make sure that userspace cannot create new requests */
1336	snd_card_disconnect(ua->card);
1337
1338	/* make sure that there are no pending USB requests */
1339	__list_for_each(midi, &ua->midi_list)
1340		snd_usbmidi_disconnect(midi);
1341	abort_alsa_playback(ua);
1342	abort_alsa_capture(ua);
1343	mutex_lock(&ua->mutex);
1344	stop_usb_playback(ua);
1345	stop_usb_capture(ua);
1346	mutex_unlock(&ua->mutex);
1347
1348	free_usb_related_resources(ua, interface);
1349
1350	devices_used &= ~(1 << ua->card_index);
1351
1352	snd_card_free_when_closed(ua->card);
1353
1354	mutex_unlock(&devices_mutex);
1355}
1356
1357static struct usb_device_id ua101_ids[] = {
1358	{ USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1359	{ USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1360	{ USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1361	{ }
1362};
1363MODULE_DEVICE_TABLE(usb, ua101_ids);
1364
1365static struct usb_driver ua101_driver = {
1366	.name = "snd-ua101",
1367	.id_table = ua101_ids,
1368	.probe = ua101_probe,
1369	.disconnect = ua101_disconnect,
1370#if 0
1371	.suspend = ua101_suspend,
1372	.resume = ua101_resume,
1373#endif
1374};
1375
1376static int __init alsa_card_ua101_init(void)
1377{
1378	return usb_register(&ua101_driver);
1379}
1380
1381static void __exit alsa_card_ua101_exit(void)
1382{
1383	usb_deregister(&ua101_driver);
1384	mutex_destroy(&devices_mutex);
1385}
1386
1387module_init(alsa_card_ua101_init);
1388module_exit(alsa_card_ua101_exit);