1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Edirol UA-101/UA-1000 driver
   4 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5 */
   6
   7#include <linux/init.h>
   8#include <linux/module.h>
   9#include <linux/slab.h>
  10#include <linux/usb.h>
  11#include <linux/usb/audio.h>
  12#include <sound/core.h>
  13#include <sound/initval.h>
  14#include <sound/pcm.h>
  15#include <sound/pcm_params.h>
  16#include "../usbaudio.h"
  17#include "../midi.h"
  18
  19MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  20MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  21MODULE_LICENSE("GPL v2");
  22
  23/*
  24 * Should not be lower than the minimum scheduling delay of the host
  25 * controller.  Some Intel controllers need more than one frame; as long as
  26 * that driver doesn't tell us about this, use 1.5 frames just to be sure.
  27 */
  28#define MIN_QUEUE_LENGTH	12
  29/* Somewhat random. */
  30#define MAX_QUEUE_LENGTH	30
  31/*
  32 * This magic value optimizes memory usage efficiency for the UA-101's packet
  33 * sizes at all sample rates, taking into account the stupid cache pool sizes
  34 * that usb_alloc_coherent() uses.
  35 */
  36#define DEFAULT_QUEUE_LENGTH	21
  37
  38#define MAX_PACKET_SIZE		672 /* hardware specific */
  39#define MAX_MEMORY_BUFFERS	DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
  40					     PAGE_SIZE / MAX_PACKET_SIZE)
  41
  42static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  43static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  44static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  45static unsigned int queue_length = 21;
  46
  47module_param_array(index, int, NULL, 0444);
  48MODULE_PARM_DESC(index, "card index");
  49module_param_array(id, charp, NULL, 0444);
  50MODULE_PARM_DESC(id, "ID string");
  51module_param_array(enable, bool, NULL, 0444);
  52MODULE_PARM_DESC(enable, "enable card");
  53module_param(queue_length, uint, 0644);
  54MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  55		 __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  56
  57enum {
  58	INTF_PLAYBACK,
  59	INTF_CAPTURE,
  60	INTF_MIDI,
  61
  62	INTF_COUNT
  63};
  64
  65/* bits in struct ua101::states */
  66enum {
  67	USB_CAPTURE_RUNNING,
  68	USB_PLAYBACK_RUNNING,
  69	ALSA_CAPTURE_OPEN,
  70	ALSA_PLAYBACK_OPEN,
  71	ALSA_CAPTURE_RUNNING,
  72	ALSA_PLAYBACK_RUNNING,
  73	CAPTURE_URB_COMPLETED,
  74	PLAYBACK_URB_COMPLETED,
  75	DISCONNECTED,
  76};
  77
  78struct ua101 {
  79	struct usb_device *dev;
  80	struct snd_card *card;
  81	struct usb_interface *intf[INTF_COUNT];
  82	int card_index;
  83	struct snd_pcm *pcm;
  84	struct list_head midi_list;
  85	u64 format_bit;
  86	unsigned int rate;
  87	unsigned int packets_per_second;
  88	spinlock_t lock;
  89	struct mutex mutex;
  90	unsigned long states;
  91
  92	/* FIFO to synchronize playback rate to capture rate */
  93	unsigned int rate_feedback_start;
  94	unsigned int rate_feedback_count;
  95	u8 rate_feedback[MAX_QUEUE_LENGTH];
  96
  97	struct list_head ready_playback_urbs;
  98	struct work_struct playback_work;
  99	wait_queue_head_t alsa_capture_wait;
 100	wait_queue_head_t rate_feedback_wait;
 101	wait_queue_head_t alsa_playback_wait;
 102	struct ua101_stream {
 103		struct snd_pcm_substream *substream;
 104		unsigned int usb_pipe;
 105		unsigned int channels;
 106		unsigned int frame_bytes;
 107		unsigned int max_packet_bytes;
 108		unsigned int period_pos;
 109		unsigned int buffer_pos;
 110		unsigned int queue_length;
 111		struct ua101_urb {
 112			struct urb urb;
 113			struct usb_iso_packet_descriptor iso_frame_desc[1];
 114			struct list_head ready_list;
 115		} *urbs[MAX_QUEUE_LENGTH];
 116		struct {
 117			unsigned int size;
 118			void *addr;
 119			dma_addr_t dma;
 120		} buffers[MAX_MEMORY_BUFFERS];
 121	} capture, playback;
 122};
 123
 124static DEFINE_MUTEX(devices_mutex);
 125static unsigned int devices_used;
 126static struct usb_driver ua101_driver;
 127
 128static void abort_alsa_playback(struct ua101 *ua);
 129static void abort_alsa_capture(struct ua101 *ua);
 130
 131static const char *usb_error_string(int err)
 132{
 133	switch (err) {
 134	case -ENODEV:
 135		return "no device";
 136	case -ENOENT:
 137		return "endpoint not enabled";
 138	case -EPIPE:
 139		return "endpoint stalled";
 140	case -ENOSPC:
 141		return "not enough bandwidth";
 142	case -ESHUTDOWN:
 143		return "device disabled";
 144	case -EHOSTUNREACH:
 145		return "device suspended";
 146	case -EINVAL:
 147	case -EAGAIN:
 148	case -EFBIG:
 149	case -EMSGSIZE:
 150		return "internal error";
 151	default:
 152		return "unknown error";
 153	}
 154}
 155
 156static void abort_usb_capture(struct ua101 *ua)
 157{
 158	if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 159		wake_up(&ua->alsa_capture_wait);
 160		wake_up(&ua->rate_feedback_wait);
 161	}
 162}
 163
 164static void abort_usb_playback(struct ua101 *ua)
 165{
 166	if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
 167		wake_up(&ua->alsa_playback_wait);
 168}
 169
 170static void playback_urb_complete(struct urb *usb_urb)
 171{
 172	struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
 173	struct ua101 *ua = urb->urb.context;
 174	unsigned long flags;
 175
 176	if (unlikely(urb->urb.status == -ENOENT ||	/* unlinked */
 177		     urb->urb.status == -ENODEV ||	/* device removed */
 178		     urb->urb.status == -ECONNRESET ||	/* unlinked */
 179		     urb->urb.status == -ESHUTDOWN)) {	/* device disabled */
 180		abort_usb_playback(ua);
 181		abort_alsa_playback(ua);
 182		return;
 183	}
 184
 185	if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
 186		/* append URB to FIFO */
 187		spin_lock_irqsave(&ua->lock, flags);
 188		list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
 189		if (ua->rate_feedback_count > 0)
 190			queue_work(system_highpri_wq, &ua->playback_work);
 191		ua->playback.substream->runtime->delay -=
 192				urb->urb.iso_frame_desc[0].length /
 193						ua->playback.frame_bytes;
 194		spin_unlock_irqrestore(&ua->lock, flags);
 195	}
 196}
 197
 198static void first_playback_urb_complete(struct urb *urb)
 199{
 200	struct ua101 *ua = urb->context;
 201
 202	urb->complete = playback_urb_complete;
 203	playback_urb_complete(urb);
 204
 205	set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 206	wake_up(&ua->alsa_playback_wait);
 207}
 208
 209/* copy data from the ALSA ring buffer into the URB buffer */
 210static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
 211			       unsigned int frames)
 212{
 213	struct snd_pcm_runtime *runtime;
 214	unsigned int frame_bytes, frames1;
 215	const u8 *source;
 216
 217	runtime = stream->substream->runtime;
 218	frame_bytes = stream->frame_bytes;
 219	source = runtime->dma_area + stream->buffer_pos * frame_bytes;
 220	if (stream->buffer_pos + frames <= runtime->buffer_size) {
 221		memcpy(urb->transfer_buffer, source, frames * frame_bytes);
 222	} else {
 223		/* wrap around at end of ring buffer */
 224		frames1 = runtime->buffer_size - stream->buffer_pos;
 225		memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
 226		memcpy(urb->transfer_buffer + frames1 * frame_bytes,
 227		       runtime->dma_area, (frames - frames1) * frame_bytes);
 228	}
 229
 230	stream->buffer_pos += frames;
 231	if (stream->buffer_pos >= runtime->buffer_size)
 232		stream->buffer_pos -= runtime->buffer_size;
 233	stream->period_pos += frames;
 234	if (stream->period_pos >= runtime->period_size) {
 235		stream->period_pos -= runtime->period_size;
 236		return true;
 237	}
 238	return false;
 239}
 240
 241static inline void add_with_wraparound(struct ua101 *ua,
 242				       unsigned int *value, unsigned int add)
 243{
 244	*value += add;
 245	if (*value >= ua->playback.queue_length)
 246		*value -= ua->playback.queue_length;
 247}
 248
 249static void playback_work(struct work_struct *work)
 250{
 251	struct ua101 *ua = container_of(work, struct ua101, playback_work);
 252	unsigned long flags;
 253	unsigned int frames;
 254	struct ua101_urb *urb;
 255	bool do_period_elapsed = false;
 256	int err;
 257
 258	if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
 259		return;
 260
 261	/*
 262	 * Synchronizing the playback rate to the capture rate is done by using
 263	 * the same sequence of packet sizes for both streams.
 264	 * Submitting a playback URB therefore requires both a ready URB and
 265	 * the size of the corresponding capture packet, i.e., both playback
 266	 * and capture URBs must have been completed.  Since the USB core does
 267	 * not guarantee that playback and capture complete callbacks are
 268	 * called alternately, we use two FIFOs for packet sizes and read URBs;
 269	 * submitting playback URBs is possible as long as both FIFOs are
 270	 * nonempty.
 271	 */
 272	spin_lock_irqsave(&ua->lock, flags);
 273	while (ua->rate_feedback_count > 0 &&
 274	       !list_empty(&ua->ready_playback_urbs)) {
 275		/* take packet size out of FIFO */
 276		frames = ua->rate_feedback[ua->rate_feedback_start];
 277		add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 278		ua->rate_feedback_count--;
 279
 280		/* take URB out of FIFO */
 281		urb = list_first_entry(&ua->ready_playback_urbs,
 282				       struct ua101_urb, ready_list);
 283		list_del(&urb->ready_list);
 284
 285		/* fill packet with data or silence */
 286		urb->urb.iso_frame_desc[0].length =
 287			frames * ua->playback.frame_bytes;
 288		if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 289			do_period_elapsed |= copy_playback_data(&ua->playback,
 290								&urb->urb,
 291								frames);
 292		else
 293			memset(urb->urb.transfer_buffer, 0,
 294			       urb->urb.iso_frame_desc[0].length);
 295
 296		/* and off you go ... */
 297		err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
 298		if (unlikely(err < 0)) {
 299			spin_unlock_irqrestore(&ua->lock, flags);
 300			abort_usb_playback(ua);
 301			abort_alsa_playback(ua);
 302			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 303				err, usb_error_string(err));
 304			return;
 305		}
 306		ua->playback.substream->runtime->delay += frames;
 307	}
 308	spin_unlock_irqrestore(&ua->lock, flags);
 309	if (do_period_elapsed)
 310		snd_pcm_period_elapsed(ua->playback.substream);
 311}
 312
 313/* copy data from the URB buffer into the ALSA ring buffer */
 314static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
 315			      unsigned int frames)
 316{
 317	struct snd_pcm_runtime *runtime;
 318	unsigned int frame_bytes, frames1;
 319	u8 *dest;
 320
 321	runtime = stream->substream->runtime;
 322	frame_bytes = stream->frame_bytes;
 323	dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
 324	if (stream->buffer_pos + frames <= runtime->buffer_size) {
 325		memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
 326	} else {
 327		/* wrap around at end of ring buffer */
 328		frames1 = runtime->buffer_size - stream->buffer_pos;
 329		memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
 330		memcpy(runtime->dma_area,
 331		       urb->transfer_buffer + frames1 * frame_bytes,
 332		       (frames - frames1) * frame_bytes);
 333	}
 334
 335	stream->buffer_pos += frames;
 336	if (stream->buffer_pos >= runtime->buffer_size)
 337		stream->buffer_pos -= runtime->buffer_size;
 338	stream->period_pos += frames;
 339	if (stream->period_pos >= runtime->period_size) {
 340		stream->period_pos -= runtime->period_size;
 341		return true;
 342	}
 343	return false;
 344}
 345
 346static void capture_urb_complete(struct urb *urb)
 347{
 348	struct ua101 *ua = urb->context;
 349	struct ua101_stream *stream = &ua->capture;
 350	unsigned long flags;
 351	unsigned int frames, write_ptr;
 352	bool do_period_elapsed;
 353	int err;
 354
 355	if (unlikely(urb->status == -ENOENT ||		/* unlinked */
 356		     urb->status == -ENODEV ||		/* device removed */
 357		     urb->status == -ECONNRESET ||	/* unlinked */
 358		     urb->status == -ESHUTDOWN))	/* device disabled */
 359		goto stream_stopped;
 360
 361	if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
 362		frames = urb->iso_frame_desc[0].actual_length /
 363			stream->frame_bytes;
 364	else
 365		frames = 0;
 366
 367	spin_lock_irqsave(&ua->lock, flags);
 368
 369	if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 370		do_period_elapsed = copy_capture_data(stream, urb, frames);
 371	else
 372		do_period_elapsed = false;
 373
 374	if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 375		err = usb_submit_urb(urb, GFP_ATOMIC);
 376		if (unlikely(err < 0)) {
 377			spin_unlock_irqrestore(&ua->lock, flags);
 378			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 379				err, usb_error_string(err));
 380			goto stream_stopped;
 381		}
 382
 383		/* append packet size to FIFO */
 384		write_ptr = ua->rate_feedback_start;
 385		add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
 386		ua->rate_feedback[write_ptr] = frames;
 387		if (ua->rate_feedback_count < ua->playback.queue_length) {
 388			ua->rate_feedback_count++;
 389			if (ua->rate_feedback_count ==
 390						ua->playback.queue_length)
 391				wake_up(&ua->rate_feedback_wait);
 392		} else {
 393			/*
 394			 * Ring buffer overflow; this happens when the playback
 395			 * stream is not running.  Throw away the oldest entry,
 396			 * so that the playback stream, when it starts, sees
 397			 * the most recent packet sizes.
 398			 */
 399			add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 400		}
 401		if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
 402		    !list_empty(&ua->ready_playback_urbs))
 403			queue_work(system_highpri_wq, &ua->playback_work);
 404	}
 405
 406	spin_unlock_irqrestore(&ua->lock, flags);
 407
 408	if (do_period_elapsed)
 409		snd_pcm_period_elapsed(stream->substream);
 410
 411	return;
 412
 413stream_stopped:
 414	abort_usb_playback(ua);
 415	abort_usb_capture(ua);
 416	abort_alsa_playback(ua);
 417	abort_alsa_capture(ua);
 418}
 419
 420static void first_capture_urb_complete(struct urb *urb)
 421{
 422	struct ua101 *ua = urb->context;
 423
 424	urb->complete = capture_urb_complete;
 425	capture_urb_complete(urb);
 426
 427	set_bit(CAPTURE_URB_COMPLETED, &ua->states);
 428	wake_up(&ua->alsa_capture_wait);
 429}
 430
 431static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
 432{
 433	unsigned int i;
 434
 435	for (i = 0; i < stream->queue_length; ++i) {
 436		int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
 437		if (err < 0) {
 438			dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 439				err, usb_error_string(err));
 440			return err;
 441		}
 442	}
 443	return 0;
 444}
 445
 446static void kill_stream_urbs(struct ua101_stream *stream)
 447{
 448	unsigned int i;
 449
 450	for (i = 0; i < stream->queue_length; ++i)
 451		if (stream->urbs[i])
 452			usb_kill_urb(&stream->urbs[i]->urb);
 453}
 454
 455static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 456{
 457	struct usb_host_interface *alts;
 458
 459	alts = ua->intf[intf_index]->cur_altsetting;
 460	if (alts->desc.bAlternateSetting != 1) {
 461		int err = usb_set_interface(ua->dev,
 462					    alts->desc.bInterfaceNumber, 1);
 463		if (err < 0) {
 464			dev_err(&ua->dev->dev,
 465				"cannot initialize interface; error %d: %s\n",
 466				err, usb_error_string(err));
 467			return err;
 468		}
 469	}
 470	return 0;
 471}
 472
 473static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 474{
 475	struct usb_host_interface *alts;
 476
 477	if (!ua->intf[intf_index])
 478		return;
 479
 480	alts = ua->intf[intf_index]->cur_altsetting;
 481	if (alts->desc.bAlternateSetting != 0) {
 482		int err = usb_set_interface(ua->dev,
 483					    alts->desc.bInterfaceNumber, 0);
 484		if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 485			dev_warn(&ua->dev->dev,
 486				 "interface reset failed; error %d: %s\n",
 487				 err, usb_error_string(err));
 488	}
 489}
 490
 491static void stop_usb_capture(struct ua101 *ua)
 492{
 493	clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 494
 495	kill_stream_urbs(&ua->capture);
 496
 497	disable_iso_interface(ua, INTF_CAPTURE);
 498}
 499
 500static int start_usb_capture(struct ua101 *ua)
 501{
 502	int err;
 503
 504	if (test_bit(DISCONNECTED, &ua->states))
 505		return -ENODEV;
 506
 507	if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 508		return 0;
 509
 510	kill_stream_urbs(&ua->capture);
 511
 512	err = enable_iso_interface(ua, INTF_CAPTURE);
 513	if (err < 0)
 514		return err;
 515
 516	clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 517	ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 518	ua->rate_feedback_start = 0;
 519	ua->rate_feedback_count = 0;
 520
 521	set_bit(USB_CAPTURE_RUNNING, &ua->states);
 522	err = submit_stream_urbs(ua, &ua->capture);
 523	if (err < 0)
 524		stop_usb_capture(ua);
 525	return err;
 526}
 527
 528static void stop_usb_playback(struct ua101 *ua)
 529{
 530	clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 531
 532	kill_stream_urbs(&ua->playback);
 533
 534	cancel_work_sync(&ua->playback_work);
 535
 536	disable_iso_interface(ua, INTF_PLAYBACK);
 537}
 538
 539static int start_usb_playback(struct ua101 *ua)
 540{
 541	unsigned int i, frames;
 542	struct urb *urb;
 543	int err = 0;
 544
 545	if (test_bit(DISCONNECTED, &ua->states))
 546		return -ENODEV;
 547
 548	if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 549		return 0;
 550
 551	kill_stream_urbs(&ua->playback);
 552	cancel_work_sync(&ua->playback_work);
 553
 554	err = enable_iso_interface(ua, INTF_PLAYBACK);
 555	if (err < 0)
 556		return err;
 557
 558	clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 559	ua->playback.urbs[0]->urb.complete =
 560		first_playback_urb_complete;
 561	spin_lock_irq(&ua->lock);
 562	INIT_LIST_HEAD(&ua->ready_playback_urbs);
 563	spin_unlock_irq(&ua->lock);
 564
 565	/*
 566	 * We submit the initial URBs all at once, so we have to wait for the
 567	 * packet size FIFO to be full.
 568	 */
 569	wait_event(ua->rate_feedback_wait,
 570		   ua->rate_feedback_count >= ua->playback.queue_length ||
 571		   !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 572		   test_bit(DISCONNECTED, &ua->states));
 573	if (test_bit(DISCONNECTED, &ua->states)) {
 574		stop_usb_playback(ua);
 575		return -ENODEV;
 576	}
 577	if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 578		stop_usb_playback(ua);
 579		return -EIO;
 580	}
 581
 582	for (i = 0; i < ua->playback.queue_length; ++i) {
 583		/* all initial URBs contain silence */
 584		spin_lock_irq(&ua->lock);
 585		frames = ua->rate_feedback[ua->rate_feedback_start];
 586		add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 587		ua->rate_feedback_count--;
 588		spin_unlock_irq(&ua->lock);
 589		urb = &ua->playback.urbs[i]->urb;
 590		urb->iso_frame_desc[0].length =
 591			frames * ua->playback.frame_bytes;
 592		memset(urb->transfer_buffer, 0,
 593		       urb->iso_frame_desc[0].length);
 594	}
 595
 596	set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 597	err = submit_stream_urbs(ua, &ua->playback);
 598	if (err < 0)
 599		stop_usb_playback(ua);
 600	return err;
 601}
 602
 603static void abort_alsa_capture(struct ua101 *ua)
 604{
 605	if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 606		snd_pcm_stop_xrun(ua->capture.substream);
 607}
 608
 609static void abort_alsa_playback(struct ua101 *ua)
 610{
 611	if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 612		snd_pcm_stop_xrun(ua->playback.substream);
 613}
 614
 615static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 616			 unsigned int channels)
 617{
 618	int err;
 619
 620	substream->runtime->hw.info =
 621		SNDRV_PCM_INFO_MMAP |
 622		SNDRV_PCM_INFO_MMAP_VALID |
 623		SNDRV_PCM_INFO_BATCH |
 624		SNDRV_PCM_INFO_INTERLEAVED |
 625		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 626		SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 627	substream->runtime->hw.formats = ua->format_bit;
 628	substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 629	substream->runtime->hw.rate_min = ua->rate;
 630	substream->runtime->hw.rate_max = ua->rate;
 631	substream->runtime->hw.channels_min = channels;
 632	substream->runtime->hw.channels_max = channels;
 633	substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 634	substream->runtime->hw.period_bytes_min = 1;
 635	substream->runtime->hw.period_bytes_max = UINT_MAX;
 636	substream->runtime->hw.periods_min = 2;
 637	substream->runtime->hw.periods_max = UINT_MAX;
 638	err = snd_pcm_hw_constraint_minmax(substream->runtime,
 639					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 640					   1500000 / ua->packets_per_second,
 641					   UINT_MAX);
 642	if (err < 0)
 643		return err;
 644	err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 645	return err;
 646}
 647
 648static int capture_pcm_open(struct snd_pcm_substream *substream)
 649{
 650	struct ua101 *ua = substream->private_data;
 651	int err;
 652
 653	ua->capture.substream = substream;
 654	err = set_stream_hw(ua, substream, ua->capture.channels);
 655	if (err < 0)
 656		return err;
 657	substream->runtime->hw.fifo_size =
 658		DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 659	substream->runtime->delay = substream->runtime->hw.fifo_size;
 660
 661	mutex_lock(&ua->mutex);
 662	err = start_usb_capture(ua);
 663	if (err >= 0)
 664		set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 665	mutex_unlock(&ua->mutex);
 666	return err;
 667}
 668
 669static int playback_pcm_open(struct snd_pcm_substream *substream)
 670{
 671	struct ua101 *ua = substream->private_data;
 672	int err;
 673
 674	ua->playback.substream = substream;
 675	err = set_stream_hw(ua, substream, ua->playback.channels);
 676	if (err < 0)
 677		return err;
 678	substream->runtime->hw.fifo_size =
 679		DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 680				  ua->packets_per_second);
 681
 682	mutex_lock(&ua->mutex);
 683	err = start_usb_capture(ua);
 684	if (err < 0)
 685		goto error;
 686	err = start_usb_playback(ua);
 687	if (err < 0) {
 688		if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 689			stop_usb_capture(ua);
 690		goto error;
 691	}
 692	set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 693error:
 694	mutex_unlock(&ua->mutex);
 695	return err;
 696}
 697
 698static int capture_pcm_close(struct snd_pcm_substream *substream)
 699{
 700	struct ua101 *ua = substream->private_data;
 701
 702	mutex_lock(&ua->mutex);
 703	clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 704	if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 705		stop_usb_capture(ua);
 706	mutex_unlock(&ua->mutex);
 707	return 0;
 708}
 709
 710static int playback_pcm_close(struct snd_pcm_substream *substream)
 711{
 712	struct ua101 *ua = substream->private_data;
 713
 714	mutex_lock(&ua->mutex);
 715	stop_usb_playback(ua);
 716	clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 717	if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 718		stop_usb_capture(ua);
 719	mutex_unlock(&ua->mutex);
 720	return 0;
 721}
 722
 723static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 724				 struct snd_pcm_hw_params *hw_params)
 725{
 726	struct ua101 *ua = substream->private_data;
 727	int err;
 728
 729	mutex_lock(&ua->mutex);
 730	err = start_usb_capture(ua);
 731	mutex_unlock(&ua->mutex);
 732	return err;
 733}
 734
 735static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 736				  struct snd_pcm_hw_params *hw_params)
 737{
 738	struct ua101 *ua = substream->private_data;
 739	int err;
 740
 741	mutex_lock(&ua->mutex);
 742	err = start_usb_capture(ua);
 743	if (err >= 0)
 744		err = start_usb_playback(ua);
 745	mutex_unlock(&ua->mutex);
 746	return err;
 747}
 748
 749static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 750{
 751	struct ua101 *ua = substream->private_data;
 752	int err;
 753
 754	mutex_lock(&ua->mutex);
 755	err = start_usb_capture(ua);
 756	mutex_unlock(&ua->mutex);
 757	if (err < 0)
 758		return err;
 759
 760	/*
 761	 * The EHCI driver schedules the first packet of an iso stream at 10 ms
 762	 * in the future, i.e., no data is actually captured for that long.
 763	 * Take the wait here so that the stream is known to be actually
 764	 * running when the start trigger has been called.
 765	 */
 766	wait_event(ua->alsa_capture_wait,
 767		   test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 768		   !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 769	if (test_bit(DISCONNECTED, &ua->states))
 770		return -ENODEV;
 771	if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 772		return -EIO;
 773
 774	ua->capture.period_pos = 0;
 775	ua->capture.buffer_pos = 0;
 776	return 0;
 777}
 778
 779static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 780{
 781	struct ua101 *ua = substream->private_data;
 782	int err;
 783
 784	mutex_lock(&ua->mutex);
 785	err = start_usb_capture(ua);
 786	if (err >= 0)
 787		err = start_usb_playback(ua);
 788	mutex_unlock(&ua->mutex);
 789	if (err < 0)
 790		return err;
 791
 792	/* see the comment in capture_pcm_prepare() */
 793	wait_event(ua->alsa_playback_wait,
 794		   test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 795		   !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 796	if (test_bit(DISCONNECTED, &ua->states))
 797		return -ENODEV;
 798	if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 799		return -EIO;
 800
 801	substream->runtime->delay = 0;
 802	ua->playback.period_pos = 0;
 803	ua->playback.buffer_pos = 0;
 804	return 0;
 805}
 806
 807static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 808{
 809	struct ua101 *ua = substream->private_data;
 810
 811	switch (cmd) {
 812	case SNDRV_PCM_TRIGGER_START:
 813		if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 814			return -EIO;
 815		set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 816		return 0;
 817	case SNDRV_PCM_TRIGGER_STOP:
 818		clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 819		return 0;
 820	default:
 821		return -EINVAL;
 822	}
 823}
 824
 825static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 826{
 827	struct ua101 *ua = substream->private_data;
 828
 829	switch (cmd) {
 830	case SNDRV_PCM_TRIGGER_START:
 831		if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 832			return -EIO;
 833		set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 834		return 0;
 835	case SNDRV_PCM_TRIGGER_STOP:
 836		clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 837		return 0;
 838	default:
 839		return -EINVAL;
 840	}
 841}
 842
 843static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 844						  struct ua101_stream *stream)
 845{
 846	unsigned long flags;
 847	unsigned int pos;
 848
 849	spin_lock_irqsave(&ua->lock, flags);
 850	pos = stream->buffer_pos;
 851	spin_unlock_irqrestore(&ua->lock, flags);
 852	return pos;
 853}
 854
 855static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 856{
 857	struct ua101 *ua = subs->private_data;
 858
 859	return ua101_pcm_pointer(ua, &ua->capture);
 860}
 861
 862static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 863{
 864	struct ua101 *ua = subs->private_data;
 865
 866	return ua101_pcm_pointer(ua, &ua->playback);
 867}
 868
 869static const struct snd_pcm_ops capture_pcm_ops = {
 870	.open = capture_pcm_open,
 871	.close = capture_pcm_close,
 872	.hw_params = capture_pcm_hw_params,
 873	.prepare = capture_pcm_prepare,
 874	.trigger = capture_pcm_trigger,
 875	.pointer = capture_pcm_pointer,
 876};
 877
 878static const struct snd_pcm_ops playback_pcm_ops = {
 879	.open = playback_pcm_open,
 880	.close = playback_pcm_close,
 881	.hw_params = playback_pcm_hw_params,
 882	.prepare = playback_pcm_prepare,
 883	.trigger = playback_pcm_trigger,
 884	.pointer = playback_pcm_pointer,
 885};
 886
 887static const struct uac_format_type_i_discrete_descriptor *
 888find_format_descriptor(struct usb_interface *interface)
 889{
 890	struct usb_host_interface *alt;
 891	u8 *extra;
 892	int extralen;
 893
 894	if (interface->num_altsetting != 2) {
 895		dev_err(&interface->dev, "invalid num_altsetting\n");
 896		return NULL;
 897	}
 898
 899	alt = &interface->altsetting[0];
 900	if (alt->desc.bNumEndpoints != 0) {
 901		dev_err(&interface->dev, "invalid bNumEndpoints\n");
 902		return NULL;
 903	}
 904
 905	alt = &interface->altsetting[1];
 906	if (alt->desc.bNumEndpoints != 1) {
 907		dev_err(&interface->dev, "invalid bNumEndpoints\n");
 908		return NULL;
 909	}
 910
 911	extra = alt->extra;
 912	extralen = alt->extralen;
 913	while (extralen >= sizeof(struct usb_descriptor_header)) {
 914		struct uac_format_type_i_discrete_descriptor *desc;
 915
 916		desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 917		if (desc->bLength > extralen) {
 918			dev_err(&interface->dev, "descriptor overflow\n");
 919			return NULL;
 920		}
 921		if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 922		    desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 923		    desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 924			if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 925			    desc->bSamFreqType != 1) {
 926				dev_err(&interface->dev,
 927					"invalid format type\n");
 928				return NULL;
 929			}
 930			return desc;
 931		}
 932		extralen -= desc->bLength;
 933		extra += desc->bLength;
 934	}
 935	dev_err(&interface->dev, "sample format descriptor not found\n");
 936	return NULL;
 937}
 938
 939static int detect_usb_format(struct ua101 *ua)
 940{
 941	const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 942	const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 943	const struct usb_endpoint_descriptor *epd;
 944	unsigned int rate2;
 945
 946	fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 947	fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 948	if (!fmt_capture || !fmt_playback)
 949		return -ENXIO;
 950
 951	switch (fmt_capture->bSubframeSize) {
 952	case 3:
 953		ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 954		break;
 955	case 4:
 956		ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 957		break;
 958	default:
 959		dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 960		return -ENXIO;
 961	}
 962	if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 963		dev_err(&ua->dev->dev,
 964			"playback/capture sample widths do not match\n");
 965		return -ENXIO;
 966	}
 967
 968	if (fmt_capture->bBitResolution != 24 ||
 969	    fmt_playback->bBitResolution != 24) {
 970		dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
 971		return -ENXIO;
 972	}
 973
 974	ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
 975	rate2 = combine_triple(fmt_playback->tSamFreq[0]);
 976	if (ua->rate != rate2) {
 977		dev_err(&ua->dev->dev,
 978			"playback/capture rates do not match: %u/%u\n",
 979			rate2, ua->rate);
 980		return -ENXIO;
 981	}
 982
 983	switch (ua->dev->speed) {
 984	case USB_SPEED_FULL:
 985		ua->packets_per_second = 1000;
 986		break;
 987	case USB_SPEED_HIGH:
 988		ua->packets_per_second = 8000;
 989		break;
 990	default:
 991		dev_err(&ua->dev->dev, "unknown device speed\n");
 992		return -ENXIO;
 993	}
 994
 995	ua->capture.channels = fmt_capture->bNrChannels;
 996	ua->playback.channels = fmt_playback->bNrChannels;
 997	ua->capture.frame_bytes =
 998		fmt_capture->bSubframeSize * ua->capture.channels;
 999	ua->playback.frame_bytes =
1000		fmt_playback->bSubframeSize * ua->playback.channels;
1001
1002	epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1003	if (!usb_endpoint_is_isoc_in(epd) || usb_endpoint_maxp(epd) == 0) {
1004		dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1005		return -ENXIO;
1006	}
1007	ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1008	ua->capture.max_packet_bytes = usb_endpoint_maxp(epd);
1009
1010	epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1011	if (!usb_endpoint_is_isoc_out(epd) || usb_endpoint_maxp(epd) == 0) {
1012		dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1013		return -ENXIO;
1014	}
1015	ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1016	ua->playback.max_packet_bytes = usb_endpoint_maxp(epd);
1017	return 0;
1018}
1019
1020static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1021{
1022	unsigned int remaining_packets, packets, packets_per_page, i;
1023	size_t size;
1024
1025	stream->queue_length = queue_length;
1026	stream->queue_length = max(stream->queue_length,
1027				   (unsigned int)MIN_QUEUE_LENGTH);
1028	stream->queue_length = min(stream->queue_length,
1029				   (unsigned int)MAX_QUEUE_LENGTH);
1030
1031	/*
1032	 * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1033	 * quite bad when used with the packet sizes of this device (e.g. 280,
1034	 * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1035	 * a smaller buffer only for the last chunk.
1036	 */
1037	remaining_packets = stream->queue_length;
1038	packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1039	for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1040		packets = min(remaining_packets, packets_per_page);
1041		size = packets * stream->max_packet_bytes;
1042		stream->buffers[i].addr =
1043			usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1044					   &stream->buffers[i].dma);
1045		if (!stream->buffers[i].addr)
1046			return -ENOMEM;
1047		stream->buffers[i].size = size;
1048		remaining_packets -= packets;
1049		if (!remaining_packets)
1050			break;
1051	}
1052	if (remaining_packets) {
1053		dev_err(&ua->dev->dev, "too many packets\n");
1054		return -ENXIO;
1055	}
1056	return 0;
1057}
1058
1059static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1060{
1061	unsigned int i;
1062
1063	for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1064		usb_free_coherent(ua->dev,
1065				  stream->buffers[i].size,
1066				  stream->buffers[i].addr,
1067				  stream->buffers[i].dma);
1068}
1069
1070static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1071			     void (*urb_complete)(struct urb *))
1072{
1073	unsigned max_packet_size = stream->max_packet_bytes;
1074	struct ua101_urb *urb;
1075	unsigned int b, u = 0;
1076
1077	for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1078		unsigned int size = stream->buffers[b].size;
1079		u8 *addr = stream->buffers[b].addr;
1080		dma_addr_t dma = stream->buffers[b].dma;
1081
1082		while (size >= max_packet_size) {
1083			if (u >= stream->queue_length)
1084				goto bufsize_error;
1085			urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1086			if (!urb)
1087				return -ENOMEM;
1088			usb_init_urb(&urb->urb);
1089			urb->urb.dev = ua->dev;
1090			urb->urb.pipe = stream->usb_pipe;
1091			urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1092			urb->urb.transfer_buffer = addr;
1093			urb->urb.transfer_dma = dma;
1094			urb->urb.transfer_buffer_length = max_packet_size;
1095			urb->urb.number_of_packets = 1;
1096			urb->urb.interval = 1;
1097			urb->urb.context = ua;
1098			urb->urb.complete = urb_complete;
1099			urb->urb.iso_frame_desc[0].offset = 0;
1100			urb->urb.iso_frame_desc[0].length = max_packet_size;
1101			stream->urbs[u++] = urb;
1102			size -= max_packet_size;
1103			addr += max_packet_size;
1104			dma += max_packet_size;
1105		}
1106	}
1107	if (u == stream->queue_length)
1108		return 0;
1109bufsize_error:
1110	dev_err(&ua->dev->dev, "internal buffer size error\n");
1111	return -ENXIO;
1112}
1113
1114static void free_stream_urbs(struct ua101_stream *stream)
1115{
1116	unsigned int i;
1117
1118	for (i = 0; i < stream->queue_length; ++i) {
1119		kfree(stream->urbs[i]);
1120		stream->urbs[i] = NULL;
1121	}
1122}
1123
1124static void free_usb_related_resources(struct ua101 *ua,
1125				       struct usb_interface *interface)
1126{
1127	unsigned int i;
1128	struct usb_interface *intf;
1129
1130	mutex_lock(&ua->mutex);
1131	free_stream_urbs(&ua->capture);
1132	free_stream_urbs(&ua->playback);
1133	mutex_unlock(&ua->mutex);
1134	free_stream_buffers(ua, &ua->capture);
1135	free_stream_buffers(ua, &ua->playback);
1136
1137	for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1138		mutex_lock(&ua->mutex);
1139		intf = ua->intf[i];
1140		ua->intf[i] = NULL;
1141		mutex_unlock(&ua->mutex);
1142		if (intf) {
1143			usb_set_intfdata(intf, NULL);
1144			if (intf != interface)
1145				usb_driver_release_interface(&ua101_driver,
1146							     intf);
1147		}
1148	}
1149}
1150
1151static void ua101_card_free(struct snd_card *card)
1152{
1153	struct ua101 *ua = card->private_data;
1154
1155	mutex_destroy(&ua->mutex);
1156}
1157
1158static int ua101_probe(struct usb_interface *interface,
1159		       const struct usb_device_id *usb_id)
1160{
1161	static const struct snd_usb_midi_endpoint_info midi_ep = {
1162		.out_cables = 0x0001,
1163		.in_cables = 0x0001
1164	};
1165	static const struct snd_usb_audio_quirk midi_quirk = {
1166		.type = QUIRK_MIDI_FIXED_ENDPOINT,
1167		.data = &midi_ep
1168	};
1169	static const int intf_numbers[2][3] = {
1170		{	/* UA-101 */
1171			[INTF_PLAYBACK] = 0,
1172			[INTF_CAPTURE] = 1,
1173			[INTF_MIDI] = 2,
1174		},
1175		{	/* UA-1000 */
1176			[INTF_CAPTURE] = 1,
1177			[INTF_PLAYBACK] = 2,
1178			[INTF_MIDI] = 3,
1179		},
1180	};
1181	struct snd_card *card;
1182	struct ua101 *ua;
1183	unsigned int card_index, i;
1184	int is_ua1000;
1185	const char *name;
1186	char usb_path[32];
1187	int err;
1188
1189	is_ua1000 = usb_id->idProduct == 0x0044;
1190
1191	if (interface->altsetting->desc.bInterfaceNumber !=
1192	    intf_numbers[is_ua1000][0])
1193		return -ENODEV;
1194
1195	mutex_lock(&devices_mutex);
1196
1197	for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1198		if (enable[card_index] && !(devices_used & (1 << card_index)))
1199			break;
1200	if (card_index >= SNDRV_CARDS) {
1201		mutex_unlock(&devices_mutex);
1202		return -ENOENT;
1203	}
1204	err = snd_card_new(&interface->dev,
1205			   index[card_index], id[card_index], THIS_MODULE,
1206			   sizeof(*ua), &card);
1207	if (err < 0) {
1208		mutex_unlock(&devices_mutex);
1209		return err;
1210	}
1211	card->private_free = ua101_card_free;
1212	ua = card->private_data;
1213	ua->dev = interface_to_usbdev(interface);
1214	ua->card = card;
1215	ua->card_index = card_index;
1216	INIT_LIST_HEAD(&ua->midi_list);
1217	spin_lock_init(&ua->lock);
1218	mutex_init(&ua->mutex);
1219	INIT_LIST_HEAD(&ua->ready_playback_urbs);
1220	INIT_WORK(&ua->playback_work, playback_work);
1221	init_waitqueue_head(&ua->alsa_capture_wait);
1222	init_waitqueue_head(&ua->rate_feedback_wait);
1223	init_waitqueue_head(&ua->alsa_playback_wait);
1224
1225	ua->intf[0] = interface;
1226	for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1227		ua->intf[i] = usb_ifnum_to_if(ua->dev,
1228					      intf_numbers[is_ua1000][i]);
1229		if (!ua->intf[i]) {
1230			dev_err(&ua->dev->dev, "interface %u not found\n",
1231				intf_numbers[is_ua1000][i]);
1232			err = -ENXIO;
1233			goto probe_error;
1234		}
1235		err = usb_driver_claim_interface(&ua101_driver,
1236						 ua->intf[i], ua);
1237		if (err < 0) {
1238			ua->intf[i] = NULL;
1239			err = -EBUSY;
1240			goto probe_error;
1241		}
1242	}
1243
1244	err = detect_usb_format(ua);
1245	if (err < 0)
1246		goto probe_error;
1247
1248	name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1249	strcpy(card->driver, "UA-101");
1250	strcpy(card->shortname, name);
1251	usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1252	snprintf(ua->card->longname, sizeof(ua->card->longname),
1253		 "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1254		 ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1255		 ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1256
1257	err = alloc_stream_buffers(ua, &ua->capture);
1258	if (err < 0)
1259		goto probe_error;
1260	err = alloc_stream_buffers(ua, &ua->playback);
1261	if (err < 0)
1262		goto probe_error;
1263
1264	err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1265	if (err < 0)
1266		goto probe_error;
1267	err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1268	if (err < 0)
1269		goto probe_error;
1270
1271	err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1272	if (err < 0)
1273		goto probe_error;
1274	ua->pcm->private_data = ua;
1275	strcpy(ua->pcm->name, name);
1276	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1277	snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1278	snd_pcm_set_managed_buffer_all(ua->pcm, SNDRV_DMA_TYPE_VMALLOC,
1279				       NULL, 0, 0);
1280
1281	err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1282				 &ua->midi_list, &midi_quirk);
1283	if (err < 0)
1284		goto probe_error;
1285
1286	err = snd_card_register(card);
1287	if (err < 0)
1288		goto probe_error;
1289
1290	usb_set_intfdata(interface, ua);
1291	devices_used |= 1 << card_index;
1292
1293	mutex_unlock(&devices_mutex);
1294	return 0;
1295
1296probe_error:
1297	free_usb_related_resources(ua, interface);
1298	snd_card_free(card);
1299	mutex_unlock(&devices_mutex);
1300	return err;
1301}
1302
1303static void ua101_disconnect(struct usb_interface *interface)
1304{
1305	struct ua101 *ua = usb_get_intfdata(interface);
1306	struct list_head *midi;
1307
1308	if (!ua)
1309		return;
1310
1311	mutex_lock(&devices_mutex);
1312
1313	set_bit(DISCONNECTED, &ua->states);
1314	wake_up(&ua->rate_feedback_wait);
1315
1316	/* make sure that userspace cannot create new requests */
1317	snd_card_disconnect(ua->card);
1318
1319	/* make sure that there are no pending USB requests */
1320	list_for_each(midi, &ua->midi_list)
1321		snd_usbmidi_disconnect(midi);
1322	abort_alsa_playback(ua);
1323	abort_alsa_capture(ua);
1324	mutex_lock(&ua->mutex);
1325	stop_usb_playback(ua);
1326	stop_usb_capture(ua);
1327	mutex_unlock(&ua->mutex);
1328
1329	free_usb_related_resources(ua, interface);
1330
1331	devices_used &= ~(1 << ua->card_index);
1332
1333	snd_card_free_when_closed(ua->card);
1334
1335	mutex_unlock(&devices_mutex);
1336}
1337
1338static const struct usb_device_id ua101_ids[] = {
1339	{ USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1340	{ USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1341	{ USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1342	{ }
1343};
1344MODULE_DEVICE_TABLE(usb, ua101_ids);
1345
1346static struct usb_driver ua101_driver = {
1347	.name = "snd-ua101",
1348	.id_table = ua101_ids,
1349	.probe = ua101_probe,
1350	.disconnect = ua101_disconnect,
1351#if 0
1352	.suspend = ua101_suspend,
1353	.resume = ua101_resume,
1354#endif
1355};
1356
1357module_usb_driver(ua101_driver);