sound/usb/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
  28 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  29 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  30 MODULE_LICENSE("GPL v2");
  31 MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
  32
  33 /*
  34  * Should not be lower than the minimum scheduling delay of the host
  35  * controller.  Some Intel controllers need more than one frame; as long as
  36  * that driver doesn't tell us about this, use 1.5 frames just to be sure.
  37  */
  38 #define MIN_QUEUE_LENGTH        12
  39 /* Somewhat random. */
  40 #define MAX_QUEUE_LENGTH        30
  41 /*
  42  * This magic value optimizes memory usage efficiency for the UA-101's packet
  43  * sizes at all sample rates, taking into account the stupid cache pool sizes
  44  * that usb_alloc_coherent() uses.
  45  */
  46 #define DEFAULT_QUEUE_LENGTH    21
  47
  48 #define MAX_PACKET_SIZE         672 /* hardware specific */
  49 #define MAX_MEMORY_BUFFERS      DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
  50                                              PAGE_SIZE / MAX_PACKET_SIZE)
  51
  52 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  53 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  54 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  55 static unsigned int queue_length = 21;
  56
  57 module_param_array(index, int, NULL, 0444);
  58 MODULE_PARM_DESC(index, "card index");
  59 module_param_array(id, charp, NULL, 0444);
  60 MODULE_PARM_DESC(id, "ID string");
  61 module_param_array(enable, bool, NULL, 0444);
  62 MODULE_PARM_DESC(enable, "enable card");
  63 module_param(queue_length, uint, 0644);
  64 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  65                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  66
  67 enum {
  68         INTF_PLAYBACK,
  69         INTF_CAPTURE,
  70         INTF_MIDI,
  71
  72         INTF_COUNT
  73 };
  74
  75 /* bits in struct ua101::states */
  76 enum {
  77         USB_CAPTURE_RUNNING,
  78         USB_PLAYBACK_RUNNING,
  79         ALSA_CAPTURE_OPEN,
  80         ALSA_PLAYBACK_OPEN,
  81         ALSA_CAPTURE_RUNNING,
  82         ALSA_PLAYBACK_RUNNING,
  83         CAPTURE_URB_COMPLETED,
  84         PLAYBACK_URB_COMPLETED,
  85         DISCONNECTED,
  86 };
  87
  88 struct ua101 {
  89         struct usb_device *dev;
  90         struct snd_card *card;
  91         struct usb_interface *intf[INTF_COUNT];
  92         int card_index;
  93         struct snd_pcm *pcm;
  94         struct list_head midi_list;
  95         u64 format_bit;
  96         unsigned int rate;
  97         unsigned int packets_per_second;
  98         spinlock_t lock;
  99         struct mutex mutex;
 100         unsigned long states;
 101
 102         /* FIFO to synchronize playback rate to capture rate */
 103         unsigned int rate_feedback_start;
 104         unsigned int rate_feedback_count;
 105         u8 rate_feedback[MAX_QUEUE_LENGTH];
 106
 107         struct list_head ready_playback_urbs;
 108         struct tasklet_struct playback_tasklet;
 109         wait_queue_head_t alsa_capture_wait;
 110         wait_queue_head_t rate_feedback_wait;
 111         wait_queue_head_t alsa_playback_wait;
 112         struct ua101_stream {
 113                 struct snd_pcm_substream *substream;
 114                 unsigned int usb_pipe;
 115                 unsigned int channels;
 116                 unsigned int frame_bytes;
 117                 unsigned int max_packet_bytes;
 118                 unsigned int period_pos;
 119                 unsigned int buffer_pos;
 120                 unsigned int queue_length;
 121                 struct ua101_urb {
 122                         struct urb urb;
 123                         struct usb_iso_packet_descriptor iso_frame_desc[1];
 124                         struct list_head ready_list;
 125                 } *urbs[MAX_QUEUE_LENGTH];
 126                 struct {
 127                         unsigned int size;
 128                         void *addr;
 129                         dma_addr_t dma;
 130                 } buffers[MAX_MEMORY_BUFFERS];
 131         } capture, playback;
 132 };
 133
 134 static DEFINE_MUTEX(devices_mutex);
 135 static unsigned int devices_used;
 136 static struct usb_driver ua101_driver;
 137
 138 static void abort_alsa_playback(struct ua101 *ua);
 139 static void abort_alsa_capture(struct ua101 *ua);
 140
 141 static const char *usb_error_string(int err)
 142 {
 143         switch (err) {
 144         case -ENODEV:
 145                 return "no device";
 146         case -ENOENT:
 147                 return "endpoint not enabled";
 148         case -EPIPE:
 149                 return "endpoint stalled";
 150         case -ENOSPC:
 151                 return "not enough bandwidth";
 152         case -ESHUTDOWN:
 153                 return "device disabled";
 154         case -EHOSTUNREACH:
 155                 return "device suspended";
 156         case -EINVAL:
 157         case -EAGAIN:
 158         case -EFBIG:
 159         case -EMSGSIZE:
 160                 return "internal error";
 161         default:
 162                 return "unknown error";
 163         }
 164 }
 165
 166 static void abort_usb_capture(struct ua101 *ua)
 167 {
 168         if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 169                 wake_up(&ua->alsa_capture_wait);
 170                 wake_up(&ua->rate_feedback_wait);
 171         }
 172 }
 173
 174 static void abort_usb_playback(struct ua101 *ua)
 175 {
 176         if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
 177                 wake_up(&ua->alsa_playback_wait);
 178 }
 179
 180 static void playback_urb_complete(struct urb *usb_urb)
 181 {
 182         struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
 183         struct ua101 *ua = urb->urb.context;
 184         unsigned long flags;
 185
 186         if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
 187                      urb->urb.status == -ENODEV ||      /* device removed */
 188                      urb->urb.status == -ECONNRESET ||  /* unlinked */
 189                      urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
 190                 abort_usb_playback(ua);
 191                 abort_alsa_playback(ua);
 192                 return;
 193         }
 194
 195         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
 196                 /* append URB to FIFO */
 197                 spin_lock_irqsave(&ua->lock, flags);
 198                 list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
 199                 if (ua->rate_feedback_count > 0)
 200                         tasklet_schedule(&ua->playback_tasklet);
 201                 ua->playback.substream->runtime->delay -=
 202                                 urb->urb.iso_frame_desc[0].length /
 203                                                 ua->playback.frame_bytes;
 204                 spin_unlock_irqrestore(&ua->lock, flags);
 205         }
 206 }
 207
 208 static void first_playback_urb_complete(struct urb *urb)
 209 {
 210         struct ua101 *ua = urb->context;
 211
 212         urb->complete = playback_urb_complete;
 213         playback_urb_complete(urb);
 214
 215         set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 216         wake_up(&ua->alsa_playback_wait);
 217 }
 218
 219 /* copy data from the ALSA ring buffer into the URB buffer */
 220 static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
 221                                unsigned int frames)
 222 {
 223         struct snd_pcm_runtime *runtime;
 224         unsigned int frame_bytes, frames1;
 225         const u8 *source;
 226
 227         runtime = stream->substream->runtime;
 228         frame_bytes = stream->frame_bytes;
 229         source = runtime->dma_area + stream->buffer_pos * frame_bytes;
 230         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 231                 memcpy(urb->transfer_buffer, source, frames * frame_bytes);
 232         } else {
 233                 /* wrap around at end of ring buffer */
 234                 frames1 = runtime->buffer_size - stream->buffer_pos;
 235                 memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
 236                 memcpy(urb->transfer_buffer + frames1 * frame_bytes,
 237                        runtime->dma_area, (frames - frames1) * frame_bytes);
 238         }
 239
 240         stream->buffer_pos += frames;
 241         if (stream->buffer_pos >= runtime->buffer_size)
 242                 stream->buffer_pos -= runtime->buffer_size;
 243         stream->period_pos += frames;
 244         if (stream->period_pos >= runtime->period_size) {
 245                 stream->period_pos -= runtime->period_size;
 246                 return true;
 247         }
 248         return false;
 249 }
 250
 251 static inline void add_with_wraparound(struct ua101 *ua,
 252                                        unsigned int *value, unsigned int add)
 253 {
 254         *value += add;
 255         if (*value >= ua->playback.queue_length)
 256                 *value -= ua->playback.queue_length;
 257 }
 258
 259 static void playback_tasklet(unsigned long data)
 260 {
 261         struct ua101 *ua = (void *)data;
 262         unsigned long flags;
 263         unsigned int frames;
 264         struct ua101_urb *urb;
 265         bool do_period_elapsed = false;
 266         int err;
 267
 268         if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
 269                 return;
 270
 271         /*
 272          * Synchronizing the playback rate to the capture rate is done by using
 273          * the same sequence of packet sizes for both streams.
 274          * Submitting a playback URB therefore requires both a ready URB and
 275          * the size of the corresponding capture packet, i.e., both playback
 276          * and capture URBs must have been completed.  Since the USB core does
 277          * not guarantee that playback and capture complete callbacks are
 278          * called alternately, we use two FIFOs for packet sizes and read URBs;
 279          * submitting playback URBs is possible as long as both FIFOs are
 280          * nonempty.
 281          */
 282         spin_lock_irqsave(&ua->lock, flags);
 283         while (ua->rate_feedback_count > 0 &&
 284                !list_empty(&ua->ready_playback_urbs)) {
 285                 /* take packet size out of FIFO */
 286                 frames = ua->rate_feedback[ua->rate_feedback_start];
 287                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 288                 ua->rate_feedback_count--;
 289
 290                 /* take URB out of FIFO */
 291                 urb = list_first_entry(&ua->ready_playback_urbs,
 292                                        struct ua101_urb, ready_list);
 293                 list_del(&urb->ready_list);
 294
 295                 /* fill packet with data or silence */
 296                 urb->urb.iso_frame_desc[0].length =
 297                         frames * ua->playback.frame_bytes;
 298                 if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 299                         do_period_elapsed |= copy_playback_data(&ua->playback,
 300                                                                 &urb->urb,
 301                                                                 frames);
 302                 else
 303                         memset(urb->urb.transfer_buffer, 0,
 304                                urb->urb.iso_frame_desc[0].length);
 305
 306                 /* and off you go ... */
 307                 err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
 308                 if (unlikely(err < 0)) {
 309                         spin_unlock_irqrestore(&ua->lock, flags);
 310                         abort_usb_playback(ua);
 311                         abort_alsa_playback(ua);
 312                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 313                                 err, usb_error_string(err));
 314                         return;
 315                 }
 316                 ua->playback.substream->runtime->delay += frames;
 317         }
 318         spin_unlock_irqrestore(&ua->lock, flags);
 319         if (do_period_elapsed)
 320                 snd_pcm_period_elapsed(ua->playback.substream);
 321 }
 322
 323 /* copy data from the URB buffer into the ALSA ring buffer */
 324 static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
 325                               unsigned int frames)
 326 {
 327         struct snd_pcm_runtime *runtime;
 328         unsigned int frame_bytes, frames1;
 329         u8 *dest;
 330
 331         runtime = stream->substream->runtime;
 332         frame_bytes = stream->frame_bytes;
 333         dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
 334         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 335                 memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
 336         } else {
 337                 /* wrap around at end of ring buffer */
 338                 frames1 = runtime->buffer_size - stream->buffer_pos;
 339                 memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
 340                 memcpy(runtime->dma_area,
 341                        urb->transfer_buffer + frames1 * frame_bytes,
 342                        (frames - frames1) * frame_bytes);
 343         }
 344
 345         stream->buffer_pos += frames;
 346         if (stream->buffer_pos >= runtime->buffer_size)
 347                 stream->buffer_pos -= runtime->buffer_size;
 348         stream->period_pos += frames;
 349         if (stream->period_pos >= runtime->period_size) {
 350                 stream->period_pos -= runtime->period_size;
 351                 return true;
 352         }
 353         return false;
 354 }
 355
 356 static void capture_urb_complete(struct urb *urb)
 357 {
 358         struct ua101 *ua = urb->context;
 359         struct ua101_stream *stream = &ua->capture;
 360         unsigned long flags;
 361         unsigned int frames, write_ptr;
 362         bool do_period_elapsed;
 363         int err;
 364
 365         if (unlikely(urb->status == -ENOENT ||          /* unlinked */
 366                      urb->status == -ENODEV ||          /* device removed */
 367                      urb->status == -ECONNRESET ||      /* unlinked */
 368                      urb->status == -ESHUTDOWN))        /* device disabled */
 369                 goto stream_stopped;
 370
 371         if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
 372                 frames = urb->iso_frame_desc[0].actual_length /
 373                         stream->frame_bytes;
 374         else
 375                 frames = 0;
 376
 377         spin_lock_irqsave(&ua->lock, flags);
 378
 379         if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 380                 do_period_elapsed = copy_capture_data(stream, urb, frames);
 381         else
 382                 do_period_elapsed = false;
 383
 384         if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 385                 err = usb_submit_urb(urb, GFP_ATOMIC);
 386                 if (unlikely(err < 0)) {
 387                         spin_unlock_irqrestore(&ua->lock, flags);
 388                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 389                                 err, usb_error_string(err));
 390                         goto stream_stopped;
 391                 }
 392
 393                 /* append packet size to FIFO */
 394                 write_ptr = ua->rate_feedback_start;
 395                 add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
 396                 ua->rate_feedback[write_ptr] = frames;
 397                 if (ua->rate_feedback_count < ua->playback.queue_length) {
 398                         ua->rate_feedback_count++;
 399                         if (ua->rate_feedback_count ==
 400                                                 ua->playback.queue_length)
 401                                 wake_up(&ua->rate_feedback_wait);
 402                 } else {
 403                         /*
 404                          * Ring buffer overflow; this happens when the playback
 405                          * stream is not running.  Throw away the oldest entry,
 406                          * so that the playback stream, when it starts, sees
 407                          * the most recent packet sizes.
 408                          */
 409                         add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 410                 }
 411                 if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
 412                     !list_empty(&ua->ready_playback_urbs))
 413                         tasklet_schedule(&ua->playback_tasklet);
 414         }
 415
 416         spin_unlock_irqrestore(&ua->lock, flags);
 417
 418         if (do_period_elapsed)
 419                 snd_pcm_period_elapsed(stream->substream);
 420
 421         return;
 422
 423 stream_stopped:
 424         abort_usb_playback(ua);
 425         abort_usb_capture(ua);
 426         abort_alsa_playback(ua);
 427         abort_alsa_capture(ua);
 428 }
 429
 430 static void first_capture_urb_complete(struct urb *urb)
 431 {
 432         struct ua101 *ua = urb->context;
 433
 434         urb->complete = capture_urb_complete;
 435         capture_urb_complete(urb);
 436
 437         set_bit(CAPTURE_URB_COMPLETED, &ua->states);
 438         wake_up(&ua->alsa_capture_wait);
 439 }
 440
 441 static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
 442 {
 443         unsigned int i;
 444
 445         for (i = 0; i < stream->queue_length; ++i) {
 446                 int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
 447                 if (err < 0) {
 448                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 449                                 err, usb_error_string(err));
 450                         return err;
 451                 }
 452         }
 453         return 0;
 454 }
 455
 456 static void kill_stream_urbs(struct ua101_stream *stream)
 457 {
 458         unsigned int i;
 459
 460         for (i = 0; i < stream->queue_length; ++i)
 461                 usb_kill_urb(&stream->urbs[i]->urb);
 462 }
 463
 464 static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 465 {
 466         struct usb_host_interface *alts;
 467
 468         alts = ua->intf[intf_index]->cur_altsetting;
 469         if (alts->desc.bAlternateSetting != 1) {
 470                 int err = usb_set_interface(ua->dev,
 471                                             alts->desc.bInterfaceNumber, 1);
 472                 if (err < 0) {
 473                         dev_err(&ua->dev->dev,
 474                                 "cannot initialize interface; error %d: %s\n",
 475                                 err, usb_error_string(err));
 476                         return err;
 477                 }
 478         }
 479         return 0;
 480 }
 481
 482 static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 483 {
 484         struct usb_host_interface *alts;
 485
 486         alts = ua->intf[intf_index]->cur_altsetting;
 487         if (alts->desc.bAlternateSetting != 0) {
 488                 int err = usb_set_interface(ua->dev,
 489                                             alts->desc.bInterfaceNumber, 0);
 490                 if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 491                         dev_warn(&ua->dev->dev,
 492                                  "interface reset failed; error %d: %s\n",
 493                                  err, usb_error_string(err));
 494         }
 495 }
 496
 497 static void stop_usb_capture(struct ua101 *ua)
 498 {
 499         clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 500
 501         kill_stream_urbs(&ua->capture);
 502
 503         disable_iso_interface(ua, INTF_CAPTURE);
 504 }
 505
 506 static int start_usb_capture(struct ua101 *ua)
 507 {
 508         int err;
 509
 510         if (test_bit(DISCONNECTED, &ua->states))
 511                 return -ENODEV;
 512
 513         if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 514                 return 0;
 515
 516         kill_stream_urbs(&ua->capture);
 517
 518         err = enable_iso_interface(ua, INTF_CAPTURE);
 519         if (err < 0)
 520                 return err;
 521
 522         clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 523         ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 524         ua->rate_feedback_start = 0;
 525         ua->rate_feedback_count = 0;
 526
 527         set_bit(USB_CAPTURE_RUNNING, &ua->states);
 528         err = submit_stream_urbs(ua, &ua->capture);
 529         if (err < 0)
 530                 stop_usb_capture(ua);
 531         return err;
 532 }
 533
 534 static void stop_usb_playback(struct ua101 *ua)
 535 {
 536         clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 537
 538         kill_stream_urbs(&ua->playback);
 539
 540         tasklet_kill(&ua->playback_tasklet);
 541
 542         disable_iso_interface(ua, INTF_PLAYBACK);
 543 }
 544
 545 static int start_usb_playback(struct ua101 *ua)
 546 {
 547         unsigned int i, frames;
 548         struct urb *urb;
 549         int err = 0;
 550
 551         if (test_bit(DISCONNECTED, &ua->states))
 552                 return -ENODEV;
 553
 554         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 555                 return 0;
 556
 557         kill_stream_urbs(&ua->playback);
 558         tasklet_kill(&ua->playback_tasklet);
 559
 560         err = enable_iso_interface(ua, INTF_PLAYBACK);
 561         if (err < 0)
 562                 return err;
 563
 564         clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 565         ua->playback.urbs[0]->urb.complete =
 566                 first_playback_urb_complete;
 567         spin_lock_irq(&ua->lock);
 568         INIT_LIST_HEAD(&ua->ready_playback_urbs);
 569         spin_unlock_irq(&ua->lock);
 570
 571         /*
 572          * We submit the initial URBs all at once, so we have to wait for the
 573          * packet size FIFO to be full.
 574          */
 575         wait_event(ua->rate_feedback_wait,
 576                    ua->rate_feedback_count >= ua->playback.queue_length ||
 577                    !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 578                    test_bit(DISCONNECTED, &ua->states));
 579         if (test_bit(DISCONNECTED, &ua->states)) {
 580                 stop_usb_playback(ua);
 581                 return -ENODEV;
 582         }
 583         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 584                 stop_usb_playback(ua);
 585                 return -EIO;
 586         }
 587
 588         for (i = 0; i < ua->playback.queue_length; ++i) {
 589                 /* all initial URBs contain silence */
 590                 spin_lock_irq(&ua->lock);
 591                 frames = ua->rate_feedback[ua->rate_feedback_start];
 592                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 593                 ua->rate_feedback_count--;
 594                 spin_unlock_irq(&ua->lock);
 595                 urb = &ua->playback.urbs[i]->urb;
 596                 urb->iso_frame_desc[0].length =
 597                         frames * ua->playback.frame_bytes;
 598                 memset(urb->transfer_buffer, 0,
 599                        urb->iso_frame_desc[0].length);
 600         }
 601
 602         set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 603         err = submit_stream_urbs(ua, &ua->playback);
 604         if (err < 0)
 605                 stop_usb_playback(ua);
 606         return err;
 607 }
 608
 609 static void abort_alsa_capture(struct ua101 *ua)
 610 {
 611         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 612                 snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
 613 }
 614
 615 static void abort_alsa_playback(struct ua101 *ua)
 616 {
 617         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 618                 snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
 619 }
 620
 621 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 622                          unsigned int channels)
 623 {
 624         int err;
 625
 626         substream->runtime->hw.info =
 627                 SNDRV_PCM_INFO_MMAP |
 628                 SNDRV_PCM_INFO_MMAP_VALID |
 629                 SNDRV_PCM_INFO_BATCH |
 630                 SNDRV_PCM_INFO_INTERLEAVED |
 631                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 632                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 633         substream->runtime->hw.formats = ua->format_bit;
 634         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 635         substream->runtime->hw.rate_min = ua->rate;
 636         substream->runtime->hw.rate_max = ua->rate;
 637         substream->runtime->hw.channels_min = channels;
 638         substream->runtime->hw.channels_max = channels;
 639         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 640         substream->runtime->hw.period_bytes_min = 1;
 641         substream->runtime->hw.period_bytes_max = UINT_MAX;
 642         substream->runtime->hw.periods_min = 2;
 643         substream->runtime->hw.periods_max = UINT_MAX;
 644         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 645                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 646                                            1500000 / ua->packets_per_second,
 647                                            8192000);
 648         if (err < 0)
 649                 return err;
 650         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 651         return err;
 652 }
 653
 654 static int capture_pcm_open(struct snd_pcm_substream *substream)
 655 {
 656         struct ua101 *ua = substream->private_data;
 657         int err;
 658
 659         ua->capture.substream = substream;
 660         err = set_stream_hw(ua, substream, ua->capture.channels);
 661         if (err < 0)
 662                 return err;
 663         substream->runtime->hw.fifo_size =
 664                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 665         substream->runtime->delay = substream->runtime->hw.fifo_size;
 666
 667         mutex_lock(&ua->mutex);
 668         err = start_usb_capture(ua);
 669         if (err >= 0)
 670                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 671         mutex_unlock(&ua->mutex);
 672         return err;
 673 }
 674
 675 static int playback_pcm_open(struct snd_pcm_substream *substream)
 676 {
 677         struct ua101 *ua = substream->private_data;
 678         int err;
 679
 680         ua->playback.substream = substream;
 681         err = set_stream_hw(ua, substream, ua->playback.channels);
 682         if (err < 0)
 683                 return err;
 684         substream->runtime->hw.fifo_size =
 685                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 686                                   ua->packets_per_second);
 687
 688         mutex_lock(&ua->mutex);
 689         err = start_usb_capture(ua);
 690         if (err < 0)
 691                 goto error;
 692         err = start_usb_playback(ua);
 693         if (err < 0) {
 694                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 695                         stop_usb_capture(ua);
 696                 goto error;
 697         }
 698         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 699 error:
 700         mutex_unlock(&ua->mutex);
 701         return err;
 702 }
 703
 704 static int capture_pcm_close(struct snd_pcm_substream *substream)
 705 {
 706         struct ua101 *ua = substream->private_data;
 707
 708         mutex_lock(&ua->mutex);
 709         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 710         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 711                 stop_usb_capture(ua);
 712         mutex_unlock(&ua->mutex);
 713         return 0;
 714 }
 715
 716 static int playback_pcm_close(struct snd_pcm_substream *substream)
 717 {
 718         struct ua101 *ua = substream->private_data;
 719
 720         mutex_lock(&ua->mutex);
 721         stop_usb_playback(ua);
 722         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 723         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 724                 stop_usb_capture(ua);
 725         mutex_unlock(&ua->mutex);
 726         return 0;
 727 }
 728
 729 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 730                                  struct snd_pcm_hw_params *hw_params)
 731 {
 732         struct ua101 *ua = substream->private_data;
 733         int err;
 734
 735         mutex_lock(&ua->mutex);
 736         err = start_usb_capture(ua);
 737         mutex_unlock(&ua->mutex);
 738         if (err < 0)
 739                 return err;
 740
 741         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 742                                                 params_buffer_bytes(hw_params));
 743 }
 744
 745 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 746                                   struct snd_pcm_hw_params *hw_params)
 747 {
 748         struct ua101 *ua = substream->private_data;
 749         int err;
 750
 751         mutex_lock(&ua->mutex);
 752         err = start_usb_capture(ua);
 753         if (err >= 0)
 754                 err = start_usb_playback(ua);
 755         mutex_unlock(&ua->mutex);
 756         if (err < 0)
 757                 return err;
 758
 759         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 760                                                 params_buffer_bytes(hw_params));
 761 }
 762
 763 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 764 {
 765         return snd_pcm_lib_free_vmalloc_buffer(substream);
 766 }
 767
 768 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 769 {
 770         struct ua101 *ua = substream->private_data;
 771         int err;
 772
 773         mutex_lock(&ua->mutex);
 774         err = start_usb_capture(ua);
 775         mutex_unlock(&ua->mutex);
 776         if (err < 0)
 777                 return err;
 778
 779         /*
 780          * The EHCI driver schedules the first packet of an iso stream at 10 ms
 781          * in the future, i.e., no data is actually captured for that long.
 782          * Take the wait here so that the stream is known to be actually
 783          * running when the start trigger has been called.
 784          */
 785         wait_event(ua->alsa_capture_wait,
 786                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 787                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 788         if (test_bit(DISCONNECTED, &ua->states))
 789                 return -ENODEV;
 790         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 791                 return -EIO;
 792
 793         ua->capture.period_pos = 0;
 794         ua->capture.buffer_pos = 0;
 795         return 0;
 796 }
 797
 798 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 799 {
 800         struct ua101 *ua = substream->private_data;
 801         int err;
 802
 803         mutex_lock(&ua->mutex);
 804         err = start_usb_capture(ua);
 805         if (err >= 0)
 806                 err = start_usb_playback(ua);
 807         mutex_unlock(&ua->mutex);
 808         if (err < 0)
 809                 return err;
 810
 811         /* see the comment in capture_pcm_prepare() */
 812         wait_event(ua->alsa_playback_wait,
 813                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 814                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 815         if (test_bit(DISCONNECTED, &ua->states))
 816                 return -ENODEV;
 817         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 818                 return -EIO;
 819
 820         substream->runtime->delay = 0;
 821         ua->playback.period_pos = 0;
 822         ua->playback.buffer_pos = 0;
 823         return 0;
 824 }
 825
 826 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 827 {
 828         struct ua101 *ua = substream->private_data;
 829
 830         switch (cmd) {
 831         case SNDRV_PCM_TRIGGER_START:
 832                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 833                         return -EIO;
 834                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 835                 return 0;
 836         case SNDRV_PCM_TRIGGER_STOP:
 837                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 838                 return 0;
 839         default:
 840                 return -EINVAL;
 841         }
 842 }
 843
 844 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 845 {
 846         struct ua101 *ua = substream->private_data;
 847
 848         switch (cmd) {
 849         case SNDRV_PCM_TRIGGER_START:
 850                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 851                         return -EIO;
 852                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 853                 return 0;
 854         case SNDRV_PCM_TRIGGER_STOP:
 855                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 856                 return 0;
 857         default:
 858                 return -EINVAL;
 859         }
 860 }
 861
 862 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 863                                                   struct ua101_stream *stream)
 864 {
 865         unsigned long flags;
 866         unsigned int pos;
 867
 868         spin_lock_irqsave(&ua->lock, flags);
 869         pos = stream->buffer_pos;
 870         spin_unlock_irqrestore(&ua->lock, flags);
 871         return pos;
 872 }
 873
 874 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 875 {
 876         struct ua101 *ua = subs->private_data;
 877
 878         return ua101_pcm_pointer(ua, &ua->capture);
 879 }
 880
 881 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 882 {
 883         struct ua101 *ua = subs->private_data;
 884
 885         return ua101_pcm_pointer(ua, &ua->playback);
 886 }
 887
 888 static struct snd_pcm_ops capture_pcm_ops = {
 889         .open = capture_pcm_open,
 890         .close = capture_pcm_close,
 891         .ioctl = snd_pcm_lib_ioctl,
 892         .hw_params = capture_pcm_hw_params,
 893         .hw_free = ua101_pcm_hw_free,
 894         .prepare = capture_pcm_prepare,
 895         .trigger = capture_pcm_trigger,
 896         .pointer = capture_pcm_pointer,
 897         .page = snd_pcm_lib_get_vmalloc_page,
 898         .mmap = snd_pcm_lib_mmap_vmalloc,
 899 };
 900
 901 static struct snd_pcm_ops playback_pcm_ops = {
 902         .open = playback_pcm_open,
 903         .close = playback_pcm_close,
 904         .ioctl = snd_pcm_lib_ioctl,
 905         .hw_params = playback_pcm_hw_params,
 906         .hw_free = ua101_pcm_hw_free,
 907         .prepare = playback_pcm_prepare,
 908         .trigger = playback_pcm_trigger,
 909         .pointer = playback_pcm_pointer,
 910         .page = snd_pcm_lib_get_vmalloc_page,
 911         .mmap = snd_pcm_lib_mmap_vmalloc,
 912 };
 913
 914 static const struct uac_format_type_i_discrete_descriptor *
 915 find_format_descriptor(struct usb_interface *interface)
 916 {
 917         struct usb_host_interface *alt;
 918         u8 *extra;
 919         int extralen;
 920
 921         if (interface->num_altsetting != 2) {
 922                 dev_err(&interface->dev, "invalid num_altsetting\n");
 923                 return NULL;
 924         }
 925
 926         alt = &interface->altsetting[0];
 927         if (alt->desc.bNumEndpoints != 0) {
 928                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 929                 return NULL;
 930         }
 931
 932         alt = &interface->altsetting[1];
 933         if (alt->desc.bNumEndpoints != 1) {
 934                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 935                 return NULL;
 936         }
 937
 938         extra = alt->extra;
 939         extralen = alt->extralen;
 940         while (extralen >= sizeof(struct usb_descriptor_header)) {
 941                 struct uac_format_type_i_discrete_descriptor *desc;
 942
 943                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 944                 if (desc->bLength > extralen) {
 945                         dev_err(&interface->dev, "descriptor overflow\n");
 946                         return NULL;
 947                 }
 948                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 949                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 950                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 951                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 952                             desc->bSamFreqType != 1) {
 953                                 dev_err(&interface->dev,
 954                                         "invalid format type\n");
 955                                 return NULL;
 956                         }
 957                         return desc;
 958                 }
 959                 extralen -= desc->bLength;
 960                 extra += desc->bLength;
 961         }
 962         dev_err(&interface->dev, "sample format descriptor not found\n");
 963         return NULL;
 964 }
 965
 966 static int detect_usb_format(struct ua101 *ua)
 967 {
 968         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 969         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 970         const struct usb_endpoint_descriptor *epd;
 971         unsigned int rate2;
 972
 973         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 974         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 975         if (!fmt_capture || !fmt_playback)
 976                 return -ENXIO;
 977
 978         switch (fmt_capture->bSubframeSize) {
 979         case 3:
 980                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 981                 break;
 982         case 4:
 983                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 984                 break;
 985         default:
 986                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 987                 return -ENXIO;
 988         }
 989         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 990                 dev_err(&ua->dev->dev,
 991                         "playback/capture sample widths do not match\n");
 992                 return -ENXIO;
 993         }
 994
 995         if (fmt_capture->bBitResolution != 24 ||
 996             fmt_playback->bBitResolution != 24) {
 997                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
 998                 return -ENXIO;
 999         }
1000
1001         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1002         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1003         if (ua->rate != rate2) {
1004                 dev_err(&ua->dev->dev,
1005                         "playback/capture rates do not match: %u/%u\n",
1006                         rate2, ua->rate);
1007                 return -ENXIO;
1008         }
1009
1010         switch (ua->dev->speed) {
1011         case USB_SPEED_FULL:
1012                 ua->packets_per_second = 1000;
1013                 break;
1014         case USB_SPEED_HIGH:
1015                 ua->packets_per_second = 8000;
1016                 break;
1017         default:
1018                 dev_err(&ua->dev->dev, "unknown device speed\n");
1019                 return -ENXIO;
1020         }
1021
1022         ua->capture.channels = fmt_capture->bNrChannels;
1023         ua->playback.channels = fmt_playback->bNrChannels;
1024         ua->capture.frame_bytes =
1025                 fmt_capture->bSubframeSize * ua->capture.channels;
1026         ua->playback.frame_bytes =
1027                 fmt_playback->bSubframeSize * ua->playback.channels;
1028
1029         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1030         if (!usb_endpoint_is_isoc_in(epd)) {
1031                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1032                 return -ENXIO;
1033         }
1034         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1035         ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1036
1037         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1038         if (!usb_endpoint_is_isoc_out(epd)) {
1039                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1040                 return -ENXIO;
1041         }
1042         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1043         ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1044         return 0;
1045 }
1046
1047 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1048 {
1049         unsigned int remaining_packets, packets, packets_per_page, i;
1050         size_t size;
1051
1052         stream->queue_length = queue_length;
1053         stream->queue_length = max(stream->queue_length,
1054                                    (unsigned int)MIN_QUEUE_LENGTH);
1055         stream->queue_length = min(stream->queue_length,
1056                                    (unsigned int)MAX_QUEUE_LENGTH);
1057
1058         /*
1059          * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1060          * quite bad when used with the packet sizes of this device (e.g. 280,
1061          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1062          * a smaller buffer only for the last chunk.
1063          */
1064         remaining_packets = stream->queue_length;
1065         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1066         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1067                 packets = min(remaining_packets, packets_per_page);
1068                 size = packets * stream->max_packet_bytes;
1069                 stream->buffers[i].addr =
1070                         usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1071                                            &stream->buffers[i].dma);
1072                 if (!stream->buffers[i].addr)
1073                         return -ENOMEM;
1074                 stream->buffers[i].size = size;
1075                 remaining_packets -= packets;
1076                 if (!remaining_packets)
1077                         break;
1078         }
1079         if (remaining_packets) {
1080                 dev_err(&ua->dev->dev, "too many packets\n");
1081                 return -ENXIO;
1082         }
1083         return 0;
1084 }
1085
1086 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1087 {
1088         unsigned int i;
1089
1090         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1091                 usb_free_coherent(ua->dev,
1092                                   stream->buffers[i].size,
1093                                   stream->buffers[i].addr,
1094                                   stream->buffers[i].dma);
1095 }
1096
1097 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1098                              void (*urb_complete)(struct urb *))
1099 {
1100         unsigned max_packet_size = stream->max_packet_bytes;
1101         struct ua101_urb *urb;
1102         unsigned int b, u = 0;
1103
1104         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1105                 unsigned int size = stream->buffers[b].size;
1106                 u8 *addr = stream->buffers[b].addr;
1107                 dma_addr_t dma = stream->buffers[b].dma;
1108
1109                 while (size >= max_packet_size) {
1110                         if (u >= stream->queue_length)
1111                                 goto bufsize_error;
1112                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1113                         if (!urb)
1114                                 return -ENOMEM;
1115                         usb_init_urb(&urb->urb);
1116                         urb->urb.dev = ua->dev;
1117                         urb->urb.pipe = stream->usb_pipe;
1118                         urb->urb.transfer_flags = URB_ISO_ASAP |
1119                                         URB_NO_TRANSFER_DMA_MAP;
1120                         urb->urb.transfer_buffer = addr;
1121                         urb->urb.transfer_dma = dma;
1122                         urb->urb.transfer_buffer_length = max_packet_size;
1123                         urb->urb.number_of_packets = 1;
1124                         urb->urb.interval = 1;
1125                         urb->urb.context = ua;
1126                         urb->urb.complete = urb_complete;
1127                         urb->urb.iso_frame_desc[0].offset = 0;
1128                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1129                         stream->urbs[u++] = urb;
1130                         size -= max_packet_size;
1131                         addr += max_packet_size;
1132                         dma += max_packet_size;
1133                 }
1134         }
1135         if (u == stream->queue_length)
1136                 return 0;
1137 bufsize_error:
1138         dev_err(&ua->dev->dev, "internal buffer size error\n");
1139         return -ENXIO;
1140 }
1141
1142 static void free_stream_urbs(struct ua101_stream *stream)
1143 {
1144         unsigned int i;
1145
1146         for (i = 0; i < stream->queue_length; ++i)
1147                 kfree(stream->urbs[i]);
1148 }
1149
1150 static void free_usb_related_resources(struct ua101 *ua,
1151                                        struct usb_interface *interface)
1152 {
1153         unsigned int i;
1154
1155         free_stream_urbs(&ua->capture);
1156         free_stream_urbs(&ua->playback);
1157         free_stream_buffers(ua, &ua->capture);
1158         free_stream_buffers(ua, &ua->playback);
1159
1160         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i)
1161                 if (ua->intf[i]) {
1162                         usb_set_intfdata(ua->intf[i], NULL);
1163                         if (ua->intf[i] != interface)
1164                                 usb_driver_release_interface(&ua101_driver,
1165                                                              ua->intf[i]);
1166                 }
1167 }
1168
1169 static void ua101_card_free(struct snd_card *card)
1170 {
1171         struct ua101 *ua = card->private_data;
1172
1173         mutex_destroy(&ua->mutex);
1174 }
1175
1176 static int ua101_probe(struct usb_interface *interface,
1177                        const struct usb_device_id *usb_id)
1178 {
1179         static const struct snd_usb_midi_endpoint_info midi_ep = {
1180                 .out_cables = 0x0001,
1181                 .in_cables = 0x0001
1182         };
1183         static const struct snd_usb_audio_quirk midi_quirk = {
1184                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1185                 .data = &midi_ep
1186         };
1187         static const int intf_numbers[2][3] = {
1188                 {       /* UA-101 */
1189                         [INTF_PLAYBACK] = 0,
1190                         [INTF_CAPTURE] = 1,
1191                         [INTF_MIDI] = 2,
1192                 },
1193                 {       /* UA-1000 */
1194                         [INTF_CAPTURE] = 1,
1195                         [INTF_PLAYBACK] = 2,
1196                         [INTF_MIDI] = 3,
1197                 },
1198         };
1199         struct snd_card *card;
1200         struct ua101 *ua;
1201         unsigned int card_index, i;
1202         int is_ua1000;
1203         const char *name;
1204         char usb_path[32];
1205         int err;
1206
1207         is_ua1000 = usb_id->idProduct == 0x0044;
1208
1209         if (interface->altsetting->desc.bInterfaceNumber !=
1210             intf_numbers[is_ua1000][0])
1211                 return -ENODEV;
1212
1213         mutex_lock(&devices_mutex);
1214
1215         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1216                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1217                         break;
1218         if (card_index >= SNDRV_CARDS) {
1219                 mutex_unlock(&devices_mutex);
1220                 return -ENOENT;
1221         }
1222         err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1223                               sizeof(*ua), &card);
1224         if (err < 0) {
1225                 mutex_unlock(&devices_mutex);
1226                 return err;
1227         }
1228         card->private_free = ua101_card_free;
1229         ua = card->private_data;
1230         ua->dev = interface_to_usbdev(interface);
1231         ua->card = card;
1232         ua->card_index = card_index;
1233         INIT_LIST_HEAD(&ua->midi_list);
1234         spin_lock_init(&ua->lock);
1235         mutex_init(&ua->mutex);
1236         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1237         tasklet_init(&ua->playback_tasklet,
1238                      playback_tasklet, (unsigned long)ua);
1239         init_waitqueue_head(&ua->alsa_capture_wait);
1240         init_waitqueue_head(&ua->rate_feedback_wait);
1241         init_waitqueue_head(&ua->alsa_playback_wait);
1242
1243         ua->intf[0] = interface;
1244         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1245                 ua->intf[i] = usb_ifnum_to_if(ua->dev,
1246                                               intf_numbers[is_ua1000][i]);
1247                 if (!ua->intf[i]) {
1248                         dev_err(&ua->dev->dev, "interface %u not found\n",
1249                                 intf_numbers[is_ua1000][i]);
1250                         err = -ENXIO;
1251                         goto probe_error;
1252                 }
1253                 err = usb_driver_claim_interface(&ua101_driver,
1254                                                  ua->intf[i], ua);
1255                 if (err < 0) {
1256                         ua->intf[i] = NULL;
1257                         err = -EBUSY;
1258                         goto probe_error;
1259                 }
1260         }
1261
1262         snd_card_set_dev(card, &interface->dev);
1263
1264         err = detect_usb_format(ua);
1265         if (err < 0)
1266                 goto probe_error;
1267
1268         name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1269         strcpy(card->driver, "UA-101");
1270         strcpy(card->shortname, name);
1271         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1272         snprintf(ua->card->longname, sizeof(ua->card->longname),
1273                  "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1274                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1275                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1276
1277         err = alloc_stream_buffers(ua, &ua->capture);
1278         if (err < 0)
1279                 goto probe_error;
1280         err = alloc_stream_buffers(ua, &ua->playback);
1281         if (err < 0)
1282                 goto probe_error;
1283
1284         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1285         if (err < 0)
1286                 goto probe_error;
1287         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1288         if (err < 0)
1289                 goto probe_error;
1290
1291         err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1292         if (err < 0)
1293                 goto probe_error;
1294         ua->pcm->private_data = ua;
1295         strcpy(ua->pcm->name, name);
1296         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1297         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1298
1299         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1300                                  &ua->midi_list, &midi_quirk);
1301         if (err < 0)
1302                 goto probe_error;
1303
1304         err = snd_card_register(card);
1305         if (err < 0)
1306                 goto probe_error;
1307
1308         usb_set_intfdata(interface, ua);
1309         devices_used |= 1 << card_index;
1310
1311         mutex_unlock(&devices_mutex);
1312         return 0;
1313
1314 probe_error:
1315         free_usb_related_resources(ua, interface);
1316         snd_card_free(card);
1317         mutex_unlock(&devices_mutex);
1318         return err;
1319 }
1320
1321 static void ua101_disconnect(struct usb_interface *interface)
1322 {
1323         struct ua101 *ua = usb_get_intfdata(interface);
1324         struct list_head *midi;
1325
1326         if (!ua)
1327                 return;
1328
1329         mutex_lock(&devices_mutex);
1330
1331         set_bit(DISCONNECTED, &ua->states);
1332         wake_up(&ua->rate_feedback_wait);
1333
1334         /* make sure that userspace cannot create new requests */
1335         snd_card_disconnect(ua->card);
1336
1337         /* make sure that there are no pending USB requests */
1338         __list_for_each(midi, &ua->midi_list)
1339                 snd_usbmidi_disconnect(midi);
1340         abort_alsa_playback(ua);
1341         abort_alsa_capture(ua);
1342         mutex_lock(&ua->mutex);
1343         stop_usb_playback(ua);
1344         stop_usb_capture(ua);
1345         mutex_unlock(&ua->mutex);
1346
1347         free_usb_related_resources(ua, interface);
1348
1349         devices_used &= ~(1 << ua->card_index);
1350
1351         snd_card_free_when_closed(ua->card);
1352
1353         mutex_unlock(&devices_mutex);
1354 }
1355
1356 static struct usb_device_id ua101_ids[] = {
1357         { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1358         { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1359         { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1360         { }
1361 };
1362 MODULE_DEVICE_TABLE(usb, ua101_ids);
1363
1364 static struct usb_driver ua101_driver = {
1365         .name = "snd-ua101",
1366         .id_table = ua101_ids,
1367         .probe = ua101_probe,
1368         .disconnect = ua101_disconnect,
1369 #if 0
1370         .suspend = ua101_suspend,
1371         .resume = ua101_resume,
1372 #endif
1373 };
1374
1375 static int __init alsa_card_ua101_init(void)
1376 {
1377         return usb_register(&ua101_driver);
1378 }
1379
1380 static void __exit alsa_card_ua101_exit(void)
1381 {
1382         usb_deregister(&ua101_driver);
1383         mutex_destroy(&devices_mutex);
1384 }
1385
1386 module_init(alsa_card_ua101_init);
1387 module_exit(alsa_card_ua101_exit);