sound/usb/misc/ua101.c

   1 /*
   2  * Edirol UA-101/UA-1000 driver
   3  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   4  *
   5  * This driver is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2.
   7  *
   8  * This driver is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this driver.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <sound/core.h>
  23 #include <sound/initval.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include "../usbaudio.h"
  27 #include "../midi.h"
  28
  29 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  30 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  31 MODULE_LICENSE("GPL v2");
  32 MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
  33
  34 /*
  35  * Should not be lower than the minimum scheduling delay of the host
  36  * controller.  Some Intel controllers need more than one frame; as long as
  37  * that driver doesn't tell us about this, use 1.5 frames just to be sure.
  38  */
  39 #define MIN_QUEUE_LENGTH        12
  40 /* Somewhat random. */
  41 #define MAX_QUEUE_LENGTH        30
  42 /*
  43  * This magic value optimizes memory usage efficiency for the UA-101's packet
  44  * sizes at all sample rates, taking into account the stupid cache pool sizes
  45  * that usb_alloc_coherent() uses.
  46  */
  47 #define DEFAULT_QUEUE_LENGTH    21
  48
  49 #define MAX_PACKET_SIZE         672 /* hardware specific */
  50 #define MAX_MEMORY_BUFFERS      DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
  51                                              PAGE_SIZE / MAX_PACKET_SIZE)
  52
  53 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  54 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  55 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  56 static unsigned int queue_length = 21;
  57
  58 module_param_array(index, int, NULL, 0444);
  59 MODULE_PARM_DESC(index, "card index");
  60 module_param_array(id, charp, NULL, 0444);
  61 MODULE_PARM_DESC(id, "ID string");
  62 module_param_array(enable, bool, NULL, 0444);
  63 MODULE_PARM_DESC(enable, "enable card");
  64 module_param(queue_length, uint, 0644);
  65 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  66                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  67
  68 enum {
  69         INTF_PLAYBACK,
  70         INTF_CAPTURE,
  71         INTF_MIDI,
  72
  73         INTF_COUNT
  74 };
  75
  76 /* bits in struct ua101::states */
  77 enum {
  78         USB_CAPTURE_RUNNING,
  79         USB_PLAYBACK_RUNNING,
  80         ALSA_CAPTURE_OPEN,
  81         ALSA_PLAYBACK_OPEN,
  82         ALSA_CAPTURE_RUNNING,
  83         ALSA_PLAYBACK_RUNNING,
  84         CAPTURE_URB_COMPLETED,
  85         PLAYBACK_URB_COMPLETED,
  86         DISCONNECTED,
  87 };
  88
  89 struct ua101 {
  90         struct usb_device *dev;
  91         struct snd_card *card;
  92         struct usb_interface *intf[INTF_COUNT];
  93         int card_index;
  94         struct snd_pcm *pcm;
  95         struct list_head midi_list;
  96         u64 format_bit;
  97         unsigned int rate;
  98         unsigned int packets_per_second;
  99         spinlock_t lock;
 100         struct mutex mutex;
 101         unsigned long states;
 102
 103         /* FIFO to synchronize playback rate to capture rate */
 104         unsigned int rate_feedback_start;
 105         unsigned int rate_feedback_count;
 106         u8 rate_feedback[MAX_QUEUE_LENGTH];
 107
 108         struct list_head ready_playback_urbs;
 109         struct tasklet_struct playback_tasklet;
 110         wait_queue_head_t alsa_capture_wait;
 111         wait_queue_head_t rate_feedback_wait;
 112         wait_queue_head_t alsa_playback_wait;
 113         struct ua101_stream {
 114                 struct snd_pcm_substream *substream;
 115                 unsigned int usb_pipe;
 116                 unsigned int channels;
 117                 unsigned int frame_bytes;
 118                 unsigned int max_packet_bytes;
 119                 unsigned int period_pos;
 120                 unsigned int buffer_pos;
 121                 unsigned int queue_length;
 122                 struct ua101_urb {
 123                         struct urb urb;
 124                         struct usb_iso_packet_descriptor iso_frame_desc[1];
 125                         struct list_head ready_list;
 126                 } *urbs[MAX_QUEUE_LENGTH];
 127                 struct {
 128                         unsigned int size;
 129                         void *addr;
 130                         dma_addr_t dma;
 131                 } buffers[MAX_MEMORY_BUFFERS];
 132         } capture, playback;
 133 };
 134
 135 static DEFINE_MUTEX(devices_mutex);
 136 static unsigned int devices_used;
 137 static struct usb_driver ua101_driver;
 138
 139 static void abort_alsa_playback(struct ua101 *ua);
 140 static void abort_alsa_capture(struct ua101 *ua);
 141
 142 static const char *usb_error_string(int err)
 143 {
 144         switch (err) {
 145         case -ENODEV:
 146                 return "no device";
 147         case -ENOENT:
 148                 return "endpoint not enabled";
 149         case -EPIPE:
 150                 return "endpoint stalled";
 151         case -ENOSPC:
 152                 return "not enough bandwidth";
 153         case -ESHUTDOWN:
 154                 return "device disabled";
 155         case -EHOSTUNREACH:
 156                 return "device suspended";
 157         case -EINVAL:
 158         case -EAGAIN:
 159         case -EFBIG:
 160         case -EMSGSIZE:
 161                 return "internal error";
 162         default:
 163                 return "unknown error";
 164         }
 165 }
 166
 167 static void abort_usb_capture(struct ua101 *ua)
 168 {
 169         if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 170                 wake_up(&ua->alsa_capture_wait);
 171                 wake_up(&ua->rate_feedback_wait);
 172         }
 173 }
 174
 175 static void abort_usb_playback(struct ua101 *ua)
 176 {
 177         if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
 178                 wake_up(&ua->alsa_playback_wait);
 179 }
 180
 181 static void playback_urb_complete(struct urb *usb_urb)
 182 {
 183         struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
 184         struct ua101 *ua = urb->urb.context;
 185         unsigned long flags;
 186
 187         if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
 188                      urb->urb.status == -ENODEV ||      /* device removed */
 189                      urb->urb.status == -ECONNRESET ||  /* unlinked */
 190                      urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
 191                 abort_usb_playback(ua);
 192                 abort_alsa_playback(ua);
 193                 return;
 194         }
 195
 196         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
 197                 /* append URB to FIFO */
 198                 spin_lock_irqsave(&ua->lock, flags);
 199                 list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
 200                 if (ua->rate_feedback_count > 0)
 201                         tasklet_schedule(&ua->playback_tasklet);
 202                 ua->playback.substream->runtime->delay -=
 203                                 urb->urb.iso_frame_desc[0].length /
 204                                                 ua->playback.frame_bytes;
 205                 spin_unlock_irqrestore(&ua->lock, flags);
 206         }
 207 }
 208
 209 static void first_playback_urb_complete(struct urb *urb)
 210 {
 211         struct ua101 *ua = urb->context;
 212
 213         urb->complete = playback_urb_complete;
 214         playback_urb_complete(urb);
 215
 216         set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 217         wake_up(&ua->alsa_playback_wait);
 218 }
 219
 220 /* copy data from the ALSA ring buffer into the URB buffer */
 221 static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
 222                                unsigned int frames)
 223 {
 224         struct snd_pcm_runtime *runtime;
 225         unsigned int frame_bytes, frames1;
 226         const u8 *source;
 227
 228         runtime = stream->substream->runtime;
 229         frame_bytes = stream->frame_bytes;
 230         source = runtime->dma_area + stream->buffer_pos * frame_bytes;
 231         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 232                 memcpy(urb->transfer_buffer, source, frames * frame_bytes);
 233         } else {
 234                 /* wrap around at end of ring buffer */
 235                 frames1 = runtime->buffer_size - stream->buffer_pos;
 236                 memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
 237                 memcpy(urb->transfer_buffer + frames1 * frame_bytes,
 238                        runtime->dma_area, (frames - frames1) * frame_bytes);
 239         }
 240
 241         stream->buffer_pos += frames;
 242         if (stream->buffer_pos >= runtime->buffer_size)
 243                 stream->buffer_pos -= runtime->buffer_size;
 244         stream->period_pos += frames;
 245         if (stream->period_pos >= runtime->period_size) {
 246                 stream->period_pos -= runtime->period_size;
 247                 return true;
 248         }
 249         return false;
 250 }
 251
 252 static inline void add_with_wraparound(struct ua101 *ua,
 253                                        unsigned int *value, unsigned int add)
 254 {
 255         *value += add;
 256         if (*value >= ua->playback.queue_length)
 257                 *value -= ua->playback.queue_length;
 258 }
 259
 260 static void playback_tasklet(unsigned long data)
 261 {
 262         struct ua101 *ua = (void *)data;
 263         unsigned long flags;
 264         unsigned int frames;
 265         struct ua101_urb *urb;
 266         bool do_period_elapsed = false;
 267         int err;
 268
 269         if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
 270                 return;
 271
 272         /*
 273          * Synchronizing the playback rate to the capture rate is done by using
 274          * the same sequence of packet sizes for both streams.
 275          * Submitting a playback URB therefore requires both a ready URB and
 276          * the size of the corresponding capture packet, i.e., both playback
 277          * and capture URBs must have been completed.  Since the USB core does
 278          * not guarantee that playback and capture complete callbacks are
 279          * called alternately, we use two FIFOs for packet sizes and read URBs;
 280          * submitting playback URBs is possible as long as both FIFOs are
 281          * nonempty.
 282          */
 283         spin_lock_irqsave(&ua->lock, flags);
 284         while (ua->rate_feedback_count > 0 &&
 285                !list_empty(&ua->ready_playback_urbs)) {
 286                 /* take packet size out of FIFO */
 287                 frames = ua->rate_feedback[ua->rate_feedback_start];
 288                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 289                 ua->rate_feedback_count--;
 290
 291                 /* take URB out of FIFO */
 292                 urb = list_first_entry(&ua->ready_playback_urbs,
 293                                        struct ua101_urb, ready_list);
 294                 list_del(&urb->ready_list);
 295
 296                 /* fill packet with data or silence */
 297                 urb->urb.iso_frame_desc[0].length =
 298                         frames * ua->playback.frame_bytes;
 299                 if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 300                         do_period_elapsed |= copy_playback_data(&ua->playback,
 301                                                                 &urb->urb,
 302                                                                 frames);
 303                 else
 304                         memset(urb->urb.transfer_buffer, 0,
 305                                urb->urb.iso_frame_desc[0].length);
 306
 307                 /* and off you go ... */
 308                 err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
 309                 if (unlikely(err < 0)) {
 310                         spin_unlock_irqrestore(&ua->lock, flags);
 311                         abort_usb_playback(ua);
 312                         abort_alsa_playback(ua);
 313                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 314                                 err, usb_error_string(err));
 315                         return;
 316                 }
 317                 ua->playback.substream->runtime->delay += frames;
 318         }
 319         spin_unlock_irqrestore(&ua->lock, flags);
 320         if (do_period_elapsed)
 321                 snd_pcm_period_elapsed(ua->playback.substream);
 322 }
 323
 324 /* copy data from the URB buffer into the ALSA ring buffer */
 325 static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
 326                               unsigned int frames)
 327 {
 328         struct snd_pcm_runtime *runtime;
 329         unsigned int frame_bytes, frames1;
 330         u8 *dest;
 331
 332         runtime = stream->substream->runtime;
 333         frame_bytes = stream->frame_bytes;
 334         dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
 335         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 336                 memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
 337         } else {
 338                 /* wrap around at end of ring buffer */
 339                 frames1 = runtime->buffer_size - stream->buffer_pos;
 340                 memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
 341                 memcpy(runtime->dma_area,
 342                        urb->transfer_buffer + frames1 * frame_bytes,
 343                        (frames - frames1) * frame_bytes);
 344         }
 345
 346         stream->buffer_pos += frames;
 347         if (stream->buffer_pos >= runtime->buffer_size)
 348                 stream->buffer_pos -= runtime->buffer_size;
 349         stream->period_pos += frames;
 350         if (stream->period_pos >= runtime->period_size) {
 351                 stream->period_pos -= runtime->period_size;
 352                 return true;
 353         }
 354         return false;
 355 }
 356
 357 static void capture_urb_complete(struct urb *urb)
 358 {
 359         struct ua101 *ua = urb->context;
 360         struct ua101_stream *stream = &ua->capture;
 361         unsigned long flags;
 362         unsigned int frames, write_ptr;
 363         bool do_period_elapsed;
 364         int err;
 365
 366         if (unlikely(urb->status == -ENOENT ||          /* unlinked */
 367                      urb->status == -ENODEV ||          /* device removed */
 368                      urb->status == -ECONNRESET ||      /* unlinked */
 369                      urb->status == -ESHUTDOWN))        /* device disabled */
 370                 goto stream_stopped;
 371
 372         if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
 373                 frames = urb->iso_frame_desc[0].actual_length /
 374                         stream->frame_bytes;
 375         else
 376                 frames = 0;
 377
 378         spin_lock_irqsave(&ua->lock, flags);
 379
 380         if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 381                 do_period_elapsed = copy_capture_data(stream, urb, frames);
 382         else
 383                 do_period_elapsed = false;
 384
 385         if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 386                 err = usb_submit_urb(urb, GFP_ATOMIC);
 387                 if (unlikely(err < 0)) {
 388                         spin_unlock_irqrestore(&ua->lock, flags);
 389                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 390                                 err, usb_error_string(err));
 391                         goto stream_stopped;
 392                 }
 393
 394                 /* append packet size to FIFO */
 395                 write_ptr = ua->rate_feedback_start;
 396                 add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
 397                 ua->rate_feedback[write_ptr] = frames;
 398                 if (ua->rate_feedback_count < ua->playback.queue_length) {
 399                         ua->rate_feedback_count++;
 400                         if (ua->rate_feedback_count ==
 401                                                 ua->playback.queue_length)
 402                                 wake_up(&ua->rate_feedback_wait);
 403                 } else {
 404                         /*
 405                          * Ring buffer overflow; this happens when the playback
 406                          * stream is not running.  Throw away the oldest entry,
 407                          * so that the playback stream, when it starts, sees
 408                          * the most recent packet sizes.
 409                          */
 410                         add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 411                 }
 412                 if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
 413                     !list_empty(&ua->ready_playback_urbs))
 414                         tasklet_schedule(&ua->playback_tasklet);
 415         }
 416
 417         spin_unlock_irqrestore(&ua->lock, flags);
 418
 419         if (do_period_elapsed)
 420                 snd_pcm_period_elapsed(stream->substream);
 421
 422         return;
 423
 424 stream_stopped:
 425         abort_usb_playback(ua);
 426         abort_usb_capture(ua);
 427         abort_alsa_playback(ua);
 428         abort_alsa_capture(ua);
 429 }
 430
 431 static void first_capture_urb_complete(struct urb *urb)
 432 {
 433         struct ua101 *ua = urb->context;
 434
 435         urb->complete = capture_urb_complete;
 436         capture_urb_complete(urb);
 437
 438         set_bit(CAPTURE_URB_COMPLETED, &ua->states);
 439         wake_up(&ua->alsa_capture_wait);
 440 }
 441
 442 static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
 443 {
 444         unsigned int i;
 445
 446         for (i = 0; i < stream->queue_length; ++i) {
 447                 int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
 448                 if (err < 0) {
 449                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 450                                 err, usb_error_string(err));
 451                         return err;
 452                 }
 453         }
 454         return 0;
 455 }
 456
 457 static void kill_stream_urbs(struct ua101_stream *stream)
 458 {
 459         unsigned int i;
 460
 461         for (i = 0; i < stream->queue_length; ++i)
 462                 if (stream->urbs[i])
 463                         usb_kill_urb(&stream->urbs[i]->urb);
 464 }
 465
 466 static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 467 {
 468         struct usb_host_interface *alts;
 469
 470         alts = ua->intf[intf_index]->cur_altsetting;
 471         if (alts->desc.bAlternateSetting != 1) {
 472                 int err = usb_set_interface(ua->dev,
 473                                             alts->desc.bInterfaceNumber, 1);
 474                 if (err < 0) {
 475                         dev_err(&ua->dev->dev,
 476                                 "cannot initialize interface; error %d: %s\n",
 477                                 err, usb_error_string(err));
 478                         return err;
 479                 }
 480         }
 481         return 0;
 482 }
 483
 484 static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 485 {
 486         struct usb_host_interface *alts;
 487
 488         if (!ua->intf[intf_index])
 489                 return;
 490
 491         alts = ua->intf[intf_index]->cur_altsetting;
 492         if (alts->desc.bAlternateSetting != 0) {
 493                 int err = usb_set_interface(ua->dev,
 494                                             alts->desc.bInterfaceNumber, 0);
 495                 if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 496                         dev_warn(&ua->dev->dev,
 497                                  "interface reset failed; error %d: %s\n",
 498                                  err, usb_error_string(err));
 499         }
 500 }
 501
 502 static void stop_usb_capture(struct ua101 *ua)
 503 {
 504         clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 505
 506         kill_stream_urbs(&ua->capture);
 507
 508         disable_iso_interface(ua, INTF_CAPTURE);
 509 }
 510
 511 static int start_usb_capture(struct ua101 *ua)
 512 {
 513         int err;
 514
 515         if (test_bit(DISCONNECTED, &ua->states))
 516                 return -ENODEV;
 517
 518         if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 519                 return 0;
 520
 521         kill_stream_urbs(&ua->capture);
 522
 523         err = enable_iso_interface(ua, INTF_CAPTURE);
 524         if (err < 0)
 525                 return err;
 526
 527         clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 528         ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 529         ua->rate_feedback_start = 0;
 530         ua->rate_feedback_count = 0;
 531
 532         set_bit(USB_CAPTURE_RUNNING, &ua->states);
 533         err = submit_stream_urbs(ua, &ua->capture);
 534         if (err < 0)
 535                 stop_usb_capture(ua);
 536         return err;
 537 }
 538
 539 static void stop_usb_playback(struct ua101 *ua)
 540 {
 541         clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 542
 543         kill_stream_urbs(&ua->playback);
 544
 545         tasklet_kill(&ua->playback_tasklet);
 546
 547         disable_iso_interface(ua, INTF_PLAYBACK);
 548 }
 549
 550 static int start_usb_playback(struct ua101 *ua)
 551 {
 552         unsigned int i, frames;
 553         struct urb *urb;
 554         int err = 0;
 555
 556         if (test_bit(DISCONNECTED, &ua->states))
 557                 return -ENODEV;
 558
 559         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 560                 return 0;
 561
 562         kill_stream_urbs(&ua->playback);
 563         tasklet_kill(&ua->playback_tasklet);
 564
 565         err = enable_iso_interface(ua, INTF_PLAYBACK);
 566         if (err < 0)
 567                 return err;
 568
 569         clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 570         ua->playback.urbs[0]->urb.complete =
 571                 first_playback_urb_complete;
 572         spin_lock_irq(&ua->lock);
 573         INIT_LIST_HEAD(&ua->ready_playback_urbs);
 574         spin_unlock_irq(&ua->lock);
 575
 576         /*
 577          * We submit the initial URBs all at once, so we have to wait for the
 578          * packet size FIFO to be full.
 579          */
 580         wait_event(ua->rate_feedback_wait,
 581                    ua->rate_feedback_count >= ua->playback.queue_length ||
 582                    !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 583                    test_bit(DISCONNECTED, &ua->states));
 584         if (test_bit(DISCONNECTED, &ua->states)) {
 585                 stop_usb_playback(ua);
 586                 return -ENODEV;
 587         }
 588         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 589                 stop_usb_playback(ua);
 590                 return -EIO;
 591         }
 592
 593         for (i = 0; i < ua->playback.queue_length; ++i) {
 594                 /* all initial URBs contain silence */
 595                 spin_lock_irq(&ua->lock);
 596                 frames = ua->rate_feedback[ua->rate_feedback_start];
 597                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 598                 ua->rate_feedback_count--;
 599                 spin_unlock_irq(&ua->lock);
 600                 urb = &ua->playback.urbs[i]->urb;
 601                 urb->iso_frame_desc[0].length =
 602                         frames * ua->playback.frame_bytes;
 603                 memset(urb->transfer_buffer, 0,
 604                        urb->iso_frame_desc[0].length);
 605         }
 606
 607         set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 608         err = submit_stream_urbs(ua, &ua->playback);
 609         if (err < 0)
 610                 stop_usb_playback(ua);
 611         return err;
 612 }
 613
 614 static void abort_alsa_capture(struct ua101 *ua)
 615 {
 616         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 617                 snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
 618 }
 619
 620 static void abort_alsa_playback(struct ua101 *ua)
 621 {
 622         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 623                 snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
 624 }
 625
 626 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 627                          unsigned int channels)
 628 {
 629         int err;
 630
 631         substream->runtime->hw.info =
 632                 SNDRV_PCM_INFO_MMAP |
 633                 SNDRV_PCM_INFO_MMAP_VALID |
 634                 SNDRV_PCM_INFO_BATCH |
 635                 SNDRV_PCM_INFO_INTERLEAVED |
 636                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 637                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 638         substream->runtime->hw.formats = ua->format_bit;
 639         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 640         substream->runtime->hw.rate_min = ua->rate;
 641         substream->runtime->hw.rate_max = ua->rate;
 642         substream->runtime->hw.channels_min = channels;
 643         substream->runtime->hw.channels_max = channels;
 644         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 645         substream->runtime->hw.period_bytes_min = 1;
 646         substream->runtime->hw.period_bytes_max = UINT_MAX;
 647         substream->runtime->hw.periods_min = 2;
 648         substream->runtime->hw.periods_max = UINT_MAX;
 649         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 650                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 651                                            1500000 / ua->packets_per_second,
 652                                            UINT_MAX);
 653         if (err < 0)
 654                 return err;
 655         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 656         return err;
 657 }
 658
 659 static int capture_pcm_open(struct snd_pcm_substream *substream)
 660 {
 661         struct ua101 *ua = substream->private_data;
 662         int err;
 663
 664         ua->capture.substream = substream;
 665         err = set_stream_hw(ua, substream, ua->capture.channels);
 666         if (err < 0)
 667                 return err;
 668         substream->runtime->hw.fifo_size =
 669                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 670         substream->runtime->delay = substream->runtime->hw.fifo_size;
 671
 672         mutex_lock(&ua->mutex);
 673         err = start_usb_capture(ua);
 674         if (err >= 0)
 675                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 676         mutex_unlock(&ua->mutex);
 677         return err;
 678 }
 679
 680 static int playback_pcm_open(struct snd_pcm_substream *substream)
 681 {
 682         struct ua101 *ua = substream->private_data;
 683         int err;
 684
 685         ua->playback.substream = substream;
 686         err = set_stream_hw(ua, substream, ua->playback.channels);
 687         if (err < 0)
 688                 return err;
 689         substream->runtime->hw.fifo_size =
 690                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 691                                   ua->packets_per_second);
 692
 693         mutex_lock(&ua->mutex);
 694         err = start_usb_capture(ua);
 695         if (err < 0)
 696                 goto error;
 697         err = start_usb_playback(ua);
 698         if (err < 0) {
 699                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 700                         stop_usb_capture(ua);
 701                 goto error;
 702         }
 703         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 704 error:
 705         mutex_unlock(&ua->mutex);
 706         return err;
 707 }
 708
 709 static int capture_pcm_close(struct snd_pcm_substream *substream)
 710 {
 711         struct ua101 *ua = substream->private_data;
 712
 713         mutex_lock(&ua->mutex);
 714         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 715         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 716                 stop_usb_capture(ua);
 717         mutex_unlock(&ua->mutex);
 718         return 0;
 719 }
 720
 721 static int playback_pcm_close(struct snd_pcm_substream *substream)
 722 {
 723         struct ua101 *ua = substream->private_data;
 724
 725         mutex_lock(&ua->mutex);
 726         stop_usb_playback(ua);
 727         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 728         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 729                 stop_usb_capture(ua);
 730         mutex_unlock(&ua->mutex);
 731         return 0;
 732 }
 733
 734 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 735                                  struct snd_pcm_hw_params *hw_params)
 736 {
 737         struct ua101 *ua = substream->private_data;
 738         int err;
 739
 740         mutex_lock(&ua->mutex);
 741         err = start_usb_capture(ua);
 742         mutex_unlock(&ua->mutex);
 743         if (err < 0)
 744                 return err;
 745
 746         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 747                                                 params_buffer_bytes(hw_params));
 748 }
 749
 750 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 751                                   struct snd_pcm_hw_params *hw_params)
 752 {
 753         struct ua101 *ua = substream->private_data;
 754         int err;
 755
 756         mutex_lock(&ua->mutex);
 757         err = start_usb_capture(ua);
 758         if (err >= 0)
 759                 err = start_usb_playback(ua);
 760         mutex_unlock(&ua->mutex);
 761         if (err < 0)
 762                 return err;
 763
 764         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 765                                                 params_buffer_bytes(hw_params));
 766 }
 767
 768 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 769 {
 770         return snd_pcm_lib_free_vmalloc_buffer(substream);
 771 }
 772
 773 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 774 {
 775         struct ua101 *ua = substream->private_data;
 776         int err;
 777
 778         mutex_lock(&ua->mutex);
 779         err = start_usb_capture(ua);
 780         mutex_unlock(&ua->mutex);
 781         if (err < 0)
 782                 return err;
 783
 784         /*
 785          * The EHCI driver schedules the first packet of an iso stream at 10 ms
 786          * in the future, i.e., no data is actually captured for that long.
 787          * Take the wait here so that the stream is known to be actually
 788          * running when the start trigger has been called.
 789          */
 790         wait_event(ua->alsa_capture_wait,
 791                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 792                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 793         if (test_bit(DISCONNECTED, &ua->states))
 794                 return -ENODEV;
 795         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 796                 return -EIO;
 797
 798         ua->capture.period_pos = 0;
 799         ua->capture.buffer_pos = 0;
 800         return 0;
 801 }
 802
 803 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 804 {
 805         struct ua101 *ua = substream->private_data;
 806         int err;
 807
 808         mutex_lock(&ua->mutex);
 809         err = start_usb_capture(ua);
 810         if (err >= 0)
 811                 err = start_usb_playback(ua);
 812         mutex_unlock(&ua->mutex);
 813         if (err < 0)
 814                 return err;
 815
 816         /* see the comment in capture_pcm_prepare() */
 817         wait_event(ua->alsa_playback_wait,
 818                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 819                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 820         if (test_bit(DISCONNECTED, &ua->states))
 821                 return -ENODEV;
 822         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 823                 return -EIO;
 824
 825         substream->runtime->delay = 0;
 826         ua->playback.period_pos = 0;
 827         ua->playback.buffer_pos = 0;
 828         return 0;
 829 }
 830
 831 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 832 {
 833         struct ua101 *ua = substream->private_data;
 834
 835         switch (cmd) {
 836         case SNDRV_PCM_TRIGGER_START:
 837                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 838                         return -EIO;
 839                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 840                 return 0;
 841         case SNDRV_PCM_TRIGGER_STOP:
 842                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 843                 return 0;
 844         default:
 845                 return -EINVAL;
 846         }
 847 }
 848
 849 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 850 {
 851         struct ua101 *ua = substream->private_data;
 852
 853         switch (cmd) {
 854         case SNDRV_PCM_TRIGGER_START:
 855                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 856                         return -EIO;
 857                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 858                 return 0;
 859         case SNDRV_PCM_TRIGGER_STOP:
 860                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 861                 return 0;
 862         default:
 863                 return -EINVAL;
 864         }
 865 }
 866
 867 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 868                                                   struct ua101_stream *stream)
 869 {
 870         unsigned long flags;
 871         unsigned int pos;
 872
 873         spin_lock_irqsave(&ua->lock, flags);
 874         pos = stream->buffer_pos;
 875         spin_unlock_irqrestore(&ua->lock, flags);
 876         return pos;
 877 }
 878
 879 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 880 {
 881         struct ua101 *ua = subs->private_data;
 882
 883         return ua101_pcm_pointer(ua, &ua->capture);
 884 }
 885
 886 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 887 {
 888         struct ua101 *ua = subs->private_data;
 889
 890         return ua101_pcm_pointer(ua, &ua->playback);
 891 }
 892
 893 static struct snd_pcm_ops capture_pcm_ops = {
 894         .open = capture_pcm_open,
 895         .close = capture_pcm_close,
 896         .ioctl = snd_pcm_lib_ioctl,
 897         .hw_params = capture_pcm_hw_params,
 898         .hw_free = ua101_pcm_hw_free,
 899         .prepare = capture_pcm_prepare,
 900         .trigger = capture_pcm_trigger,
 901         .pointer = capture_pcm_pointer,
 902         .page = snd_pcm_lib_get_vmalloc_page,
 903         .mmap = snd_pcm_lib_mmap_vmalloc,
 904 };
 905
 906 static struct snd_pcm_ops playback_pcm_ops = {
 907         .open = playback_pcm_open,
 908         .close = playback_pcm_close,
 909         .ioctl = snd_pcm_lib_ioctl,
 910         .hw_params = playback_pcm_hw_params,
 911         .hw_free = ua101_pcm_hw_free,
 912         .prepare = playback_pcm_prepare,
 913         .trigger = playback_pcm_trigger,
 914         .pointer = playback_pcm_pointer,
 915         .page = snd_pcm_lib_get_vmalloc_page,
 916         .mmap = snd_pcm_lib_mmap_vmalloc,
 917 };
 918
 919 static const struct uac_format_type_i_discrete_descriptor *
 920 find_format_descriptor(struct usb_interface *interface)
 921 {
 922         struct usb_host_interface *alt;
 923         u8 *extra;
 924         int extralen;
 925
 926         if (interface->num_altsetting != 2) {
 927                 dev_err(&interface->dev, "invalid num_altsetting\n");
 928                 return NULL;
 929         }
 930
 931         alt = &interface->altsetting[0];
 932         if (alt->desc.bNumEndpoints != 0) {
 933                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 934                 return NULL;
 935         }
 936
 937         alt = &interface->altsetting[1];
 938         if (alt->desc.bNumEndpoints != 1) {
 939                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 940                 return NULL;
 941         }
 942
 943         extra = alt->extra;
 944         extralen = alt->extralen;
 945         while (extralen >= sizeof(struct usb_descriptor_header)) {
 946                 struct uac_format_type_i_discrete_descriptor *desc;
 947
 948                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 949                 if (desc->bLength > extralen) {
 950                         dev_err(&interface->dev, "descriptor overflow\n");
 951                         return NULL;
 952                 }
 953                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 954                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 955                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 956                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 957                             desc->bSamFreqType != 1) {
 958                                 dev_err(&interface->dev,
 959                                         "invalid format type\n");
 960                                 return NULL;
 961                         }
 962                         return desc;
 963                 }
 964                 extralen -= desc->bLength;
 965                 extra += desc->bLength;
 966         }
 967         dev_err(&interface->dev, "sample format descriptor not found\n");
 968         return NULL;
 969 }
 970
 971 static int detect_usb_format(struct ua101 *ua)
 972 {
 973         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 974         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 975         const struct usb_endpoint_descriptor *epd;
 976         unsigned int rate2;
 977
 978         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 979         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 980         if (!fmt_capture || !fmt_playback)
 981                 return -ENXIO;
 982
 983         switch (fmt_capture->bSubframeSize) {
 984         case 3:
 985                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 986                 break;
 987         case 4:
 988                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 989                 break;
 990         default:
 991                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 992                 return -ENXIO;
 993         }
 994         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 995                 dev_err(&ua->dev->dev,
 996                         "playback/capture sample widths do not match\n");
 997                 return -ENXIO;
 998         }
 999
1000         if (fmt_capture->bBitResolution != 24 ||
1001             fmt_playback->bBitResolution != 24) {
1002                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
1003                 return -ENXIO;
1004         }
1005
1006         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1007         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1008         if (ua->rate != rate2) {
1009                 dev_err(&ua->dev->dev,
1010                         "playback/capture rates do not match: %u/%u\n",
1011                         rate2, ua->rate);
1012                 return -ENXIO;
1013         }
1014
1015         switch (ua->dev->speed) {
1016         case USB_SPEED_FULL:
1017                 ua->packets_per_second = 1000;
1018                 break;
1019         case USB_SPEED_HIGH:
1020                 ua->packets_per_second = 8000;
1021                 break;
1022         default:
1023                 dev_err(&ua->dev->dev, "unknown device speed\n");
1024                 return -ENXIO;
1025         }
1026
1027         ua->capture.channels = fmt_capture->bNrChannels;
1028         ua->playback.channels = fmt_playback->bNrChannels;
1029         ua->capture.frame_bytes =
1030                 fmt_capture->bSubframeSize * ua->capture.channels;
1031         ua->playback.frame_bytes =
1032                 fmt_playback->bSubframeSize * ua->playback.channels;
1033
1034         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1035         if (!usb_endpoint_is_isoc_in(epd)) {
1036                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1037                 return -ENXIO;
1038         }
1039         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1040         ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1041
1042         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1043         if (!usb_endpoint_is_isoc_out(epd)) {
1044                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1045                 return -ENXIO;
1046         }
1047         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1048         ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1049         return 0;
1050 }
1051
1052 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1053 {
1054         unsigned int remaining_packets, packets, packets_per_page, i;
1055         size_t size;
1056
1057         stream->queue_length = queue_length;
1058         stream->queue_length = max(stream->queue_length,
1059                                    (unsigned int)MIN_QUEUE_LENGTH);
1060         stream->queue_length = min(stream->queue_length,
1061                                    (unsigned int)MAX_QUEUE_LENGTH);
1062
1063         /*
1064          * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1065          * quite bad when used with the packet sizes of this device (e.g. 280,
1066          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1067          * a smaller buffer only for the last chunk.
1068          */
1069         remaining_packets = stream->queue_length;
1070         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1071         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1072                 packets = min(remaining_packets, packets_per_page);
1073                 size = packets * stream->max_packet_bytes;
1074                 stream->buffers[i].addr =
1075                         usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1076                                            &stream->buffers[i].dma);
1077                 if (!stream->buffers[i].addr)
1078                         return -ENOMEM;
1079                 stream->buffers[i].size = size;
1080                 remaining_packets -= packets;
1081                 if (!remaining_packets)
1082                         break;
1083         }
1084         if (remaining_packets) {
1085                 dev_err(&ua->dev->dev, "too many packets\n");
1086                 return -ENXIO;
1087         }
1088         return 0;
1089 }
1090
1091 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1092 {
1093         unsigned int i;
1094
1095         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1096                 usb_free_coherent(ua->dev,
1097                                   stream->buffers[i].size,
1098                                   stream->buffers[i].addr,
1099                                   stream->buffers[i].dma);
1100 }
1101
1102 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1103                              void (*urb_complete)(struct urb *))
1104 {
1105         unsigned max_packet_size = stream->max_packet_bytes;
1106         struct ua101_urb *urb;
1107         unsigned int b, u = 0;
1108
1109         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1110                 unsigned int size = stream->buffers[b].size;
1111                 u8 *addr = stream->buffers[b].addr;
1112                 dma_addr_t dma = stream->buffers[b].dma;
1113
1114                 while (size >= max_packet_size) {
1115                         if (u >= stream->queue_length)
1116                                 goto bufsize_error;
1117                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1118                         if (!urb)
1119                                 return -ENOMEM;
1120                         usb_init_urb(&urb->urb);
1121                         urb->urb.dev = ua->dev;
1122                         urb->urb.pipe = stream->usb_pipe;
1123                         urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1124                         urb->urb.transfer_buffer = addr;
1125                         urb->urb.transfer_dma = dma;
1126                         urb->urb.transfer_buffer_length = max_packet_size;
1127                         urb->urb.number_of_packets = 1;
1128                         urb->urb.interval = 1;
1129                         urb->urb.context = ua;
1130                         urb->urb.complete = urb_complete;
1131                         urb->urb.iso_frame_desc[0].offset = 0;
1132                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1133                         stream->urbs[u++] = urb;
1134                         size -= max_packet_size;
1135                         addr += max_packet_size;
1136                         dma += max_packet_size;
1137                 }
1138         }
1139         if (u == stream->queue_length)
1140                 return 0;
1141 bufsize_error:
1142         dev_err(&ua->dev->dev, "internal buffer size error\n");
1143         return -ENXIO;
1144 }
1145
1146 static void free_stream_urbs(struct ua101_stream *stream)
1147 {
1148         unsigned int i;
1149
1150         for (i = 0; i < stream->queue_length; ++i) {
1151                 kfree(stream->urbs[i]);
1152                 stream->urbs[i] = NULL;
1153         }
1154 }
1155
1156 static void free_usb_related_resources(struct ua101 *ua,
1157                                        struct usb_interface *interface)
1158 {
1159         unsigned int i;
1160         struct usb_interface *intf;
1161
1162         mutex_lock(&ua->mutex);
1163         free_stream_urbs(&ua->capture);
1164         free_stream_urbs(&ua->playback);
1165         mutex_unlock(&ua->mutex);
1166         free_stream_buffers(ua, &ua->capture);
1167         free_stream_buffers(ua, &ua->playback);
1168
1169         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1170                 mutex_lock(&ua->mutex);
1171                 intf = ua->intf[i];
1172                 ua->intf[i] = NULL;
1173                 mutex_unlock(&ua->mutex);
1174                 if (intf) {
1175                         usb_set_intfdata(intf, NULL);
1176                         if (intf != interface)
1177                                 usb_driver_release_interface(&ua101_driver,
1178                                                              intf);
1179                 }
1180         }
1181 }
1182
1183 static void ua101_card_free(struct snd_card *card)
1184 {
1185         struct ua101 *ua = card->private_data;
1186
1187         mutex_destroy(&ua->mutex);
1188 }
1189
1190 static int ua101_probe(struct usb_interface *interface,
1191                        const struct usb_device_id *usb_id)
1192 {
1193         static const struct snd_usb_midi_endpoint_info midi_ep = {
1194                 .out_cables = 0x0001,
1195                 .in_cables = 0x0001
1196         };
1197         static const struct snd_usb_audio_quirk midi_quirk = {
1198                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1199                 .data = &midi_ep
1200         };
1201         static const int intf_numbers[2][3] = {
1202                 {       /* UA-101 */
1203                         [INTF_PLAYBACK] = 0,
1204                         [INTF_CAPTURE] = 1,
1205                         [INTF_MIDI] = 2,
1206                 },
1207                 {       /* UA-1000 */
1208                         [INTF_CAPTURE] = 1,
1209                         [INTF_PLAYBACK] = 2,
1210                         [INTF_MIDI] = 3,
1211                 },
1212         };
1213         struct snd_card *card;
1214         struct ua101 *ua;
1215         unsigned int card_index, i;
1216         int is_ua1000;
1217         const char *name;
1218         char usb_path[32];
1219         int err;
1220
1221         is_ua1000 = usb_id->idProduct == 0x0044;
1222
1223         if (interface->altsetting->desc.bInterfaceNumber !=
1224             intf_numbers[is_ua1000][0])
1225                 return -ENODEV;
1226
1227         mutex_lock(&devices_mutex);
1228
1229         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1230                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1231                         break;
1232         if (card_index >= SNDRV_CARDS) {
1233                 mutex_unlock(&devices_mutex);
1234                 return -ENOENT;
1235         }
1236         err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1237                               sizeof(*ua), &card);
1238         if (err < 0) {
1239                 mutex_unlock(&devices_mutex);
1240                 return err;
1241         }
1242         card->private_free = ua101_card_free;
1243         ua = card->private_data;
1244         ua->dev = interface_to_usbdev(interface);
1245         ua->card = card;
1246         ua->card_index = card_index;
1247         INIT_LIST_HEAD(&ua->midi_list);
1248         spin_lock_init(&ua->lock);
1249         mutex_init(&ua->mutex);
1250         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1251         tasklet_init(&ua->playback_tasklet,
1252                      playback_tasklet, (unsigned long)ua);
1253         init_waitqueue_head(&ua->alsa_capture_wait);
1254         init_waitqueue_head(&ua->rate_feedback_wait);
1255         init_waitqueue_head(&ua->alsa_playback_wait);
1256
1257         ua->intf[0] = interface;
1258         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1259                 ua->intf[i] = usb_ifnum_to_if(ua->dev,
1260                                               intf_numbers[is_ua1000][i]);
1261                 if (!ua->intf[i]) {
1262                         dev_err(&ua->dev->dev, "interface %u not found\n",
1263                                 intf_numbers[is_ua1000][i]);
1264                         err = -ENXIO;
1265                         goto probe_error;
1266                 }
1267                 err = usb_driver_claim_interface(&ua101_driver,
1268                                                  ua->intf[i], ua);
1269                 if (err < 0) {
1270                         ua->intf[i] = NULL;
1271                         err = -EBUSY;
1272                         goto probe_error;
1273                 }
1274         }
1275
1276         snd_card_set_dev(card, &interface->dev);
1277
1278         err = detect_usb_format(ua);
1279         if (err < 0)
1280                 goto probe_error;
1281
1282         name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1283         strcpy(card->driver, "UA-101");
1284         strcpy(card->shortname, name);
1285         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1286         snprintf(ua->card->longname, sizeof(ua->card->longname),
1287                  "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1288                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1289                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1290
1291         err = alloc_stream_buffers(ua, &ua->capture);
1292         if (err < 0)
1293                 goto probe_error;
1294         err = alloc_stream_buffers(ua, &ua->playback);
1295         if (err < 0)
1296                 goto probe_error;
1297
1298         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1299         if (err < 0)
1300                 goto probe_error;
1301         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1302         if (err < 0)
1303                 goto probe_error;
1304
1305         err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1306         if (err < 0)
1307                 goto probe_error;
1308         ua->pcm->private_data = ua;
1309         strcpy(ua->pcm->name, name);
1310         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1311         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1312
1313         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1314                                  &ua->midi_list, &midi_quirk);
1315         if (err < 0)
1316                 goto probe_error;
1317
1318         err = snd_card_register(card);
1319         if (err < 0)
1320                 goto probe_error;
1321
1322         usb_set_intfdata(interface, ua);
1323         devices_used |= 1 << card_index;
1324
1325         mutex_unlock(&devices_mutex);
1326         return 0;
1327
1328 probe_error:
1329         free_usb_related_resources(ua, interface);
1330         snd_card_free(card);
1331         mutex_unlock(&devices_mutex);
1332         return err;
1333 }
1334
1335 static void ua101_disconnect(struct usb_interface *interface)
1336 {
1337         struct ua101 *ua = usb_get_intfdata(interface);
1338         struct list_head *midi;
1339
1340         if (!ua)
1341                 return;
1342
1343         mutex_lock(&devices_mutex);
1344
1345         set_bit(DISCONNECTED, &ua->states);
1346         wake_up(&ua->rate_feedback_wait);
1347
1348         /* make sure that userspace cannot create new requests */
1349         snd_card_disconnect(ua->card);
1350
1351         /* make sure that there are no pending USB requests */
1352         list_for_each(midi, &ua->midi_list)
1353                 snd_usbmidi_disconnect(midi);
1354         abort_alsa_playback(ua);
1355         abort_alsa_capture(ua);
1356         mutex_lock(&ua->mutex);
1357         stop_usb_playback(ua);
1358         stop_usb_capture(ua);
1359         mutex_unlock(&ua->mutex);
1360
1361         free_usb_related_resources(ua, interface);
1362
1363         devices_used &= ~(1 << ua->card_index);
1364
1365         snd_card_free_when_closed(ua->card);
1366
1367         mutex_unlock(&devices_mutex);
1368 }
1369
1370 static struct usb_device_id ua101_ids[] = {
1371         { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1372         { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1373         { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1374         { }
1375 };
1376 MODULE_DEVICE_TABLE(usb, ua101_ids);
1377
1378 static struct usb_driver ua101_driver = {
1379         .name = "snd-ua101",
1380         .id_table = ua101_ids,
1381         .probe = ua101_probe,
1382         .disconnect = ua101_disconnect,
1383 #if 0
1384         .suspend = ua101_suspend,
1385         .resume = ua101_resume,
1386 #endif
1387 };
1388
1389 module_usb_driver(ua101_driver);