sound/usb/misc/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
  19 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  20 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  21 MODULE_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
  42 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  43 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  44 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  45 static unsigned int queue_length = 21;
  46
  47 module_param_array(index, int, NULL, 0444);
  48 MODULE_PARM_DESC(index, "card index");
  49 module_param_array(id, charp, NULL, 0444);
  50 MODULE_PARM_DESC(id, "ID string");
  51 module_param_array(enable, bool, NULL, 0444);
  52 MODULE_PARM_DESC(enable, "enable card");
  53 module_param(queue_length, uint, 0644);
  54 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  55                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  56
  57 enum {
  58         INTF_PLAYBACK,
  59         INTF_CAPTURE,
  60         INTF_MIDI,
  61
  62         INTF_COUNT
  63 };
  64
  65 /* bits in struct ua101::states */
  66 enum {
  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
  78 struct 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
 124 static DEFINE_MUTEX(devices_mutex);
 125 static unsigned int devices_used;
 126 static struct usb_driver ua101_driver;
 127
 128 static void abort_alsa_playback(struct ua101 *ua);
 129 static void abort_alsa_capture(struct ua101 *ua);
 130
 131 static 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
 156 static 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
 164 static 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
 170 static 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
 198 static 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 */
 210 static 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
 241 static 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
 249 static 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 */
 314 static 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
 346 static 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
 413 stream_stopped:
 414         abort_usb_playback(ua);
 415         abort_usb_capture(ua);
 416         abort_alsa_playback(ua);
 417         abort_alsa_capture(ua);
 418 }
 419
 420 static 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
 431 static 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
 446 static 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
 455 static 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
 473 static 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
 491 static 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
 500 static 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
 528 static 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
 539 static 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
 603 static 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
 609 static 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
 615 static 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
 648 static 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
 669 static 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);
 693 error:
 694         mutex_unlock(&ua->mutex);
 695         return err;
 696 }
 697
 698 static 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
 710 static 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
 723 static 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
 735 static 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
 749 static 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
 779 static 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
 807 static 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
 825 static 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
 843 static 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
 855 static 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
 862 static 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
 869 static 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
 878 static 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
 887 static const struct uac_format_type_i_discrete_descriptor *
 888 find_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
 939 static 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
1020 static 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
1059 static 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
1070 static 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;
1109 bufsize_error:
1110         dev_err(&ua->dev->dev, "internal buffer size error\n");
1111         return -ENXIO;
1112 }
1113
1114 static 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
1124 static 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
1151 static void ua101_card_free(struct snd_card *card)
1152 {
1153         struct ua101 *ua = card->private_data;
1154
1155         mutex_destroy(&ua->mutex);
1156 }
1157
1158 static 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
1296 probe_error:
1297         free_usb_related_resources(ua, interface);
1298         snd_card_free(card);
1299         mutex_unlock(&devices_mutex);
1300         return err;
1301 }
1302
1303 static 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
1338 static 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 };
1344 MODULE_DEVICE_TABLE(usb, ua101_ids);
1345
1346 static 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
1357 module_usb_driver(ua101_driver);