ua101.c

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