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 int 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                 usb_kill_urb(&stream->urbs[i]->urb);
 463 }
 464
 465 static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 466 {
 467         struct usb_host_interface *alts;
 468
 469         alts = ua->intf[intf_index]->cur_altsetting;
 470         if (alts->desc.bAlternateSetting != 1) {
 471                 int err = usb_set_interface(ua->dev,
 472                                             alts->desc.bInterfaceNumber, 1);
 473                 if (err < 0) {
 474                         dev_err(&ua->dev->dev,
 475                                 "cannot initialize interface; error %d: %s\n",
 476                                 err, usb_error_string(err));
 477                         return err;
 478                 }
 479         }
 480         return 0;
 481 }
 482
 483 static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 484 {
 485         struct usb_host_interface *alts;
 486
 487         alts = ua->intf[intf_index]->cur_altsetting;
 488         if (alts->desc.bAlternateSetting != 0) {
 489                 int err = usb_set_interface(ua->dev,
 490                                             alts->desc.bInterfaceNumber, 0);
 491                 if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 492                         dev_warn(&ua->dev->dev,
 493                                  "interface reset failed; error %d: %s\n",
 494                                  err, usb_error_string(err));
 495         }
 496 }
 497
 498 static void stop_usb_capture(struct ua101 *ua)
 499 {
 500         clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 501
 502         kill_stream_urbs(&ua->capture);
 503
 504         disable_iso_interface(ua, INTF_CAPTURE);
 505 }
 506
 507 static int start_usb_capture(struct ua101 *ua)
 508 {
 509         int err;
 510
 511         if (test_bit(DISCONNECTED, &ua->states))
 512                 return -ENODEV;
 513
 514         if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 515                 return 0;
 516
 517         kill_stream_urbs(&ua->capture);
 518
 519         err = enable_iso_interface(ua, INTF_CAPTURE);
 520         if (err < 0)
 521                 return err;
 522
 523         clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 524         ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 525         ua->rate_feedback_start = 0;
 526         ua->rate_feedback_count = 0;
 527
 528         set_bit(USB_CAPTURE_RUNNING, &ua->states);
 529         err = submit_stream_urbs(ua, &ua->capture);
 530         if (err < 0)
 531                 stop_usb_capture(ua);
 532         return err;
 533 }
 534
 535 static void stop_usb_playback(struct ua101 *ua)
 536 {
 537         clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 538
 539         kill_stream_urbs(&ua->playback);
 540
 541         tasklet_kill(&ua->playback_tasklet);
 542
 543         disable_iso_interface(ua, INTF_PLAYBACK);
 544 }
 545
 546 static int start_usb_playback(struct ua101 *ua)
 547 {
 548         unsigned int i, frames;
 549         struct urb *urb;
 550         int err = 0;
 551
 552         if (test_bit(DISCONNECTED, &ua->states))
 553                 return -ENODEV;
 554
 555         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 556                 return 0;
 557
 558         kill_stream_urbs(&ua->playback);
 559         tasklet_kill(&ua->playback_tasklet);
 560
 561         err = enable_iso_interface(ua, INTF_PLAYBACK);
 562         if (err < 0)
 563                 return err;
 564
 565         clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 566         ua->playback.urbs[0]->urb.complete =
 567                 first_playback_urb_complete;
 568         spin_lock_irq(&ua->lock);
 569         INIT_LIST_HEAD(&ua->ready_playback_urbs);
 570         spin_unlock_irq(&ua->lock);
 571
 572         /*
 573          * We submit the initial URBs all at once, so we have to wait for the
 574          * packet size FIFO to be full.
 575          */
 576         wait_event(ua->rate_feedback_wait,
 577                    ua->rate_feedback_count >= ua->playback.queue_length ||
 578                    !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 579                    test_bit(DISCONNECTED, &ua->states));
 580         if (test_bit(DISCONNECTED, &ua->states)) {
 581                 stop_usb_playback(ua);
 582                 return -ENODEV;
 583         }
 584         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 585                 stop_usb_playback(ua);
 586                 return -EIO;
 587         }
 588
 589         for (i = 0; i < ua->playback.queue_length; ++i) {
 590                 /* all initial URBs contain silence */
 591                 spin_lock_irq(&ua->lock);
 592                 frames = ua->rate_feedback[ua->rate_feedback_start];
 593                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 594                 ua->rate_feedback_count--;
 595                 spin_unlock_irq(&ua->lock);
 596                 urb = &ua->playback.urbs[i]->urb;
 597                 urb->iso_frame_desc[0].length =
 598                         frames * ua->playback.frame_bytes;
 599                 memset(urb->transfer_buffer, 0,
 600                        urb->iso_frame_desc[0].length);
 601         }
 602
 603         set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 604         err = submit_stream_urbs(ua, &ua->playback);
 605         if (err < 0)
 606                 stop_usb_playback(ua);
 607         return err;
 608 }
 609
 610 static void abort_alsa_capture(struct ua101 *ua)
 611 {
 612         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 613                 snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
 614 }
 615
 616 static void abort_alsa_playback(struct ua101 *ua)
 617 {
 618         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 619                 snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
 620 }
 621
 622 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 623                          unsigned int channels)
 624 {
 625         int err;
 626
 627         substream->runtime->hw.info =
 628                 SNDRV_PCM_INFO_MMAP |
 629                 SNDRV_PCM_INFO_MMAP_VALID |
 630                 SNDRV_PCM_INFO_BATCH |
 631                 SNDRV_PCM_INFO_INTERLEAVED |
 632                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 633                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 634         substream->runtime->hw.formats = ua->format_bit;
 635         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 636         substream->runtime->hw.rate_min = ua->rate;
 637         substream->runtime->hw.rate_max = ua->rate;
 638         substream->runtime->hw.channels_min = channels;
 639         substream->runtime->hw.channels_max = channels;
 640         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 641         substream->runtime->hw.period_bytes_min = 1;
 642         substream->runtime->hw.period_bytes_max = UINT_MAX;
 643         substream->runtime->hw.periods_min = 2;
 644         substream->runtime->hw.periods_max = UINT_MAX;
 645         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 646                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 647                                            1500000 / ua->packets_per_second,
 648                                            UINT_MAX);
 649         if (err < 0)
 650                 return err;
 651         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 652         return err;
 653 }
 654
 655 static int capture_pcm_open(struct snd_pcm_substream *substream)
 656 {
 657         struct ua101 *ua = substream->private_data;
 658         int err;
 659
 660         ua->capture.substream = substream;
 661         err = set_stream_hw(ua, substream, ua->capture.channels);
 662         if (err < 0)
 663                 return err;
 664         substream->runtime->hw.fifo_size =
 665                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 666         substream->runtime->delay = substream->runtime->hw.fifo_size;
 667
 668         mutex_lock(&ua->mutex);
 669         err = start_usb_capture(ua);
 670         if (err >= 0)
 671                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 672         mutex_unlock(&ua->mutex);
 673         return err;
 674 }
 675
 676 static int playback_pcm_open(struct snd_pcm_substream *substream)
 677 {
 678         struct ua101 *ua = substream->private_data;
 679         int err;
 680
 681         ua->playback.substream = substream;
 682         err = set_stream_hw(ua, substream, ua->playback.channels);
 683         if (err < 0)
 684                 return err;
 685         substream->runtime->hw.fifo_size =
 686                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 687                                   ua->packets_per_second);
 688
 689         mutex_lock(&ua->mutex);
 690         err = start_usb_capture(ua);
 691         if (err < 0)
 692                 goto error;
 693         err = start_usb_playback(ua);
 694         if (err < 0) {
 695                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 696                         stop_usb_capture(ua);
 697                 goto error;
 698         }
 699         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 700 error:
 701         mutex_unlock(&ua->mutex);
 702         return err;
 703 }
 704
 705 static int capture_pcm_close(struct snd_pcm_substream *substream)
 706 {
 707         struct ua101 *ua = substream->private_data;
 708
 709         mutex_lock(&ua->mutex);
 710         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 711         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 712                 stop_usb_capture(ua);
 713         mutex_unlock(&ua->mutex);
 714         return 0;
 715 }
 716
 717 static int playback_pcm_close(struct snd_pcm_substream *substream)
 718 {
 719         struct ua101 *ua = substream->private_data;
 720
 721         mutex_lock(&ua->mutex);
 722         stop_usb_playback(ua);
 723         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 724         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 725                 stop_usb_capture(ua);
 726         mutex_unlock(&ua->mutex);
 727         return 0;
 728 }
 729
 730 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 731                                  struct snd_pcm_hw_params *hw_params)
 732 {
 733         struct ua101 *ua = substream->private_data;
 734         int err;
 735
 736         mutex_lock(&ua->mutex);
 737         err = start_usb_capture(ua);
 738         mutex_unlock(&ua->mutex);
 739         if (err < 0)
 740                 return err;
 741
 742         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 743                                                 params_buffer_bytes(hw_params));
 744 }
 745
 746 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 747                                   struct snd_pcm_hw_params *hw_params)
 748 {
 749         struct ua101 *ua = substream->private_data;
 750         int err;
 751
 752         mutex_lock(&ua->mutex);
 753         err = start_usb_capture(ua);
 754         if (err >= 0)
 755                 err = start_usb_playback(ua);
 756         mutex_unlock(&ua->mutex);
 757         if (err < 0)
 758                 return err;
 759
 760         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 761                                                 params_buffer_bytes(hw_params));
 762 }
 763
 764 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 765 {
 766         return snd_pcm_lib_free_vmalloc_buffer(substream);
 767 }
 768
 769 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 770 {
 771         struct ua101 *ua = substream->private_data;
 772         int err;
 773
 774         mutex_lock(&ua->mutex);
 775         err = start_usb_capture(ua);
 776         mutex_unlock(&ua->mutex);
 777         if (err < 0)
 778                 return err;
 779
 780         /*
 781          * The EHCI driver schedules the first packet of an iso stream at 10 ms
 782          * in the future, i.e., no data is actually captured for that long.
 783          * Take the wait here so that the stream is known to be actually
 784          * running when the start trigger has been called.
 785          */
 786         wait_event(ua->alsa_capture_wait,
 787                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 788                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 789         if (test_bit(DISCONNECTED, &ua->states))
 790                 return -ENODEV;
 791         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 792                 return -EIO;
 793
 794         ua->capture.period_pos = 0;
 795         ua->capture.buffer_pos = 0;
 796         return 0;
 797 }
 798
 799 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 800 {
 801         struct ua101 *ua = substream->private_data;
 802         int err;
 803
 804         mutex_lock(&ua->mutex);
 805         err = start_usb_capture(ua);
 806         if (err >= 0)
 807                 err = start_usb_playback(ua);
 808         mutex_unlock(&ua->mutex);
 809         if (err < 0)
 810                 return err;
 811
 812         /* see the comment in capture_pcm_prepare() */
 813         wait_event(ua->alsa_playback_wait,
 814                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 815                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 816         if (test_bit(DISCONNECTED, &ua->states))
 817                 return -ENODEV;
 818         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 819                 return -EIO;
 820
 821         substream->runtime->delay = 0;
 822         ua->playback.period_pos = 0;
 823         ua->playback.buffer_pos = 0;
 824         return 0;
 825 }
 826
 827 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 828 {
 829         struct ua101 *ua = substream->private_data;
 830
 831         switch (cmd) {
 832         case SNDRV_PCM_TRIGGER_START:
 833                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 834                         return -EIO;
 835                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 836                 return 0;
 837         case SNDRV_PCM_TRIGGER_STOP:
 838                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 839                 return 0;
 840         default:
 841                 return -EINVAL;
 842         }
 843 }
 844
 845 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 846 {
 847         struct ua101 *ua = substream->private_data;
 848
 849         switch (cmd) {
 850         case SNDRV_PCM_TRIGGER_START:
 851                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 852                         return -EIO;
 853                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 854                 return 0;
 855         case SNDRV_PCM_TRIGGER_STOP:
 856                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 857                 return 0;
 858         default:
 859                 return -EINVAL;
 860         }
 861 }
 862
 863 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 864                                                   struct ua101_stream *stream)
 865 {
 866         unsigned long flags;
 867         unsigned int pos;
 868
 869         spin_lock_irqsave(&ua->lock, flags);
 870         pos = stream->buffer_pos;
 871         spin_unlock_irqrestore(&ua->lock, flags);
 872         return pos;
 873 }
 874
 875 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 876 {
 877         struct ua101 *ua = subs->private_data;
 878
 879         return ua101_pcm_pointer(ua, &ua->capture);
 880 }
 881
 882 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 883 {
 884         struct ua101 *ua = subs->private_data;
 885
 886         return ua101_pcm_pointer(ua, &ua->playback);
 887 }
 888
 889 static struct snd_pcm_ops capture_pcm_ops = {
 890         .open = capture_pcm_open,
 891         .close = capture_pcm_close,
 892         .ioctl = snd_pcm_lib_ioctl,
 893         .hw_params = capture_pcm_hw_params,
 894         .hw_free = ua101_pcm_hw_free,
 895         .prepare = capture_pcm_prepare,
 896         .trigger = capture_pcm_trigger,
 897         .pointer = capture_pcm_pointer,
 898         .page = snd_pcm_lib_get_vmalloc_page,
 899         .mmap = snd_pcm_lib_mmap_vmalloc,
 900 };
 901
 902 static struct snd_pcm_ops playback_pcm_ops = {
 903         .open = playback_pcm_open,
 904         .close = playback_pcm_close,
 905         .ioctl = snd_pcm_lib_ioctl,
 906         .hw_params = playback_pcm_hw_params,
 907         .hw_free = ua101_pcm_hw_free,
 908         .prepare = playback_pcm_prepare,
 909         .trigger = playback_pcm_trigger,
 910         .pointer = playback_pcm_pointer,
 911         .page = snd_pcm_lib_get_vmalloc_page,
 912         .mmap = snd_pcm_lib_mmap_vmalloc,
 913 };
 914
 915 static const struct uac_format_type_i_discrete_descriptor *
 916 find_format_descriptor(struct usb_interface *interface)
 917 {
 918         struct usb_host_interface *alt;
 919         u8 *extra;
 920         int extralen;
 921
 922         if (interface->num_altsetting != 2) {
 923                 dev_err(&interface->dev, "invalid num_altsetting\n");
 924                 return NULL;
 925         }
 926
 927         alt = &interface->altsetting[0];
 928         if (alt->desc.bNumEndpoints != 0) {
 929                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 930                 return NULL;
 931         }
 932
 933         alt = &interface->altsetting[1];
 934         if (alt->desc.bNumEndpoints != 1) {
 935                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 936                 return NULL;
 937         }
 938
 939         extra = alt->extra;
 940         extralen = alt->extralen;
 941         while (extralen >= sizeof(struct usb_descriptor_header)) {
 942                 struct uac_format_type_i_discrete_descriptor *desc;
 943
 944                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 945                 if (desc->bLength > extralen) {
 946                         dev_err(&interface->dev, "descriptor overflow\n");
 947                         return NULL;
 948                 }
 949                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 950                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 951                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 952                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 953                             desc->bSamFreqType != 1) {
 954                                 dev_err(&interface->dev,
 955                                         "invalid format type\n");
 956                                 return NULL;
 957                         }
 958                         return desc;
 959                 }
 960                 extralen -= desc->bLength;
 961                 extra += desc->bLength;
 962         }
 963         dev_err(&interface->dev, "sample format descriptor not found\n");
 964         return NULL;
 965 }
 966
 967 static int detect_usb_format(struct ua101 *ua)
 968 {
 969         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 970         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 971         const struct usb_endpoint_descriptor *epd;
 972         unsigned int rate2;
 973
 974         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 975         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 976         if (!fmt_capture || !fmt_playback)
 977                 return -ENXIO;
 978
 979         switch (fmt_capture->bSubframeSize) {
 980         case 3:
 981                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 982                 break;
 983         case 4:
 984                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 985                 break;
 986         default:
 987                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 988                 return -ENXIO;
 989         }
 990         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 991                 dev_err(&ua->dev->dev,
 992                         "playback/capture sample widths do not match\n");
 993                 return -ENXIO;
 994         }
 995
 996         if (fmt_capture->bBitResolution != 24 ||
 997             fmt_playback->bBitResolution != 24) {
 998                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
 999                 return -ENXIO;
1000         }
1001
1002         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1003         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1004         if (ua->rate != rate2) {
1005                 dev_err(&ua->dev->dev,
1006                         "playback/capture rates do not match: %u/%u\n",
1007                         rate2, ua->rate);
1008                 return -ENXIO;
1009         }
1010
1011         switch (ua->dev->speed) {
1012         case USB_SPEED_FULL:
1013                 ua->packets_per_second = 1000;
1014                 break;
1015         case USB_SPEED_HIGH:
1016                 ua->packets_per_second = 8000;
1017                 break;
1018         default:
1019                 dev_err(&ua->dev->dev, "unknown device speed\n");
1020                 return -ENXIO;
1021         }
1022
1023         ua->capture.channels = fmt_capture->bNrChannels;
1024         ua->playback.channels = fmt_playback->bNrChannels;
1025         ua->capture.frame_bytes =
1026                 fmt_capture->bSubframeSize * ua->capture.channels;
1027         ua->playback.frame_bytes =
1028                 fmt_playback->bSubframeSize * ua->playback.channels;
1029
1030         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1031         if (!usb_endpoint_is_isoc_in(epd)) {
1032                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1033                 return -ENXIO;
1034         }
1035         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1036         ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1037
1038         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1039         if (!usb_endpoint_is_isoc_out(epd)) {
1040                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1041                 return -ENXIO;
1042         }
1043         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1044         ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1045         return 0;
1046 }
1047
1048 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1049 {
1050         unsigned int remaining_packets, packets, packets_per_page, i;
1051         size_t size;
1052
1053         stream->queue_length = queue_length;
1054         stream->queue_length = max(stream->queue_length,
1055                                    (unsigned int)MIN_QUEUE_LENGTH);
1056         stream->queue_length = min(stream->queue_length,
1057                                    (unsigned int)MAX_QUEUE_LENGTH);
1058
1059         /*
1060          * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1061          * quite bad when used with the packet sizes of this device (e.g. 280,
1062          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1063          * a smaller buffer only for the last chunk.
1064          */
1065         remaining_packets = stream->queue_length;
1066         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1067         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1068                 packets = min(remaining_packets, packets_per_page);
1069                 size = packets * stream->max_packet_bytes;
1070                 stream->buffers[i].addr =
1071                         usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1072                                            &stream->buffers[i].dma);
1073                 if (!stream->buffers[i].addr)
1074                         return -ENOMEM;
1075                 stream->buffers[i].size = size;
1076                 remaining_packets -= packets;
1077                 if (!remaining_packets)
1078                         break;
1079         }
1080         if (remaining_packets) {
1081                 dev_err(&ua->dev->dev, "too many packets\n");
1082                 return -ENXIO;
1083         }
1084         return 0;
1085 }
1086
1087 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1088 {
1089         unsigned int i;
1090
1091         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1092                 usb_free_coherent(ua->dev,
1093                                   stream->buffers[i].size,
1094                                   stream->buffers[i].addr,
1095                                   stream->buffers[i].dma);
1096 }
1097
1098 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1099                              void (*urb_complete)(struct urb *))
1100 {
1101         unsigned max_packet_size = stream->max_packet_bytes;
1102         struct ua101_urb *urb;
1103         unsigned int b, u = 0;
1104
1105         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1106                 unsigned int size = stream->buffers[b].size;
1107                 u8 *addr = stream->buffers[b].addr;
1108                 dma_addr_t dma = stream->buffers[b].dma;
1109
1110                 while (size >= max_packet_size) {
1111                         if (u >= stream->queue_length)
1112                                 goto bufsize_error;
1113                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1114                         if (!urb)
1115                                 return -ENOMEM;
1116                         usb_init_urb(&urb->urb);
1117                         urb->urb.dev = ua->dev;
1118                         urb->urb.pipe = stream->usb_pipe;
1119                         urb->urb.transfer_flags = URB_ISO_ASAP |
1120                                         URB_NO_TRANSFER_DMA_MAP;
1121                         urb->urb.transfer_buffer = addr;
1122                         urb->urb.transfer_dma = dma;
1123                         urb->urb.transfer_buffer_length = max_packet_size;
1124                         urb->urb.number_of_packets = 1;
1125                         urb->urb.interval = 1;
1126                         urb->urb.context = ua;
1127                         urb->urb.complete = urb_complete;
1128                         urb->urb.iso_frame_desc[0].offset = 0;
1129                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1130                         stream->urbs[u++] = urb;
1131                         size -= max_packet_size;
1132                         addr += max_packet_size;
1133                         dma += max_packet_size;
1134                 }
1135         }
1136         if (u == stream->queue_length)
1137                 return 0;
1138 bufsize_error:
1139         dev_err(&ua->dev->dev, "internal buffer size error\n");
1140         return -ENXIO;
1141 }
1142
1143 static void free_stream_urbs(struct ua101_stream *stream)
1144 {
1145         unsigned int i;
1146
1147         for (i = 0; i < stream->queue_length; ++i)
1148                 kfree(stream->urbs[i]);
1149 }
1150
1151 static void free_usb_related_resources(struct ua101 *ua,
1152                                        struct usb_interface *interface)
1153 {
1154         unsigned int i;
1155
1156         free_stream_urbs(&ua->capture);
1157         free_stream_urbs(&ua->playback);
1158         free_stream_buffers(ua, &ua->capture);
1159         free_stream_buffers(ua, &ua->playback);
1160
1161         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i)
1162                 if (ua->intf[i]) {
1163                         usb_set_intfdata(ua->intf[i], NULL);
1164                         if (ua->intf[i] != interface)
1165                                 usb_driver_release_interface(&ua101_driver,
1166                                                              ua->intf[i]);
1167                 }
1168 }
1169
1170 static void ua101_card_free(struct snd_card *card)
1171 {
1172         struct ua101 *ua = card->private_data;
1173
1174         mutex_destroy(&ua->mutex);
1175 }
1176
1177 static int ua101_probe(struct usb_interface *interface,
1178                        const struct usb_device_id *usb_id)
1179 {
1180         static const struct snd_usb_midi_endpoint_info midi_ep = {
1181                 .out_cables = 0x0001,
1182                 .in_cables = 0x0001
1183         };
1184         static const struct snd_usb_audio_quirk midi_quirk = {
1185                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1186                 .data = &midi_ep
1187         };
1188         static const int intf_numbers[2][3] = {
1189                 {       /* UA-101 */
1190                         [INTF_PLAYBACK] = 0,
1191                         [INTF_CAPTURE] = 1,
1192                         [INTF_MIDI] = 2,
1193                 },
1194                 {       /* UA-1000 */
1195                         [INTF_CAPTURE] = 1,
1196                         [INTF_PLAYBACK] = 2,
1197                         [INTF_MIDI] = 3,
1198                 },
1199         };
1200         struct snd_card *card;
1201         struct ua101 *ua;
1202         unsigned int card_index, i;
1203         int is_ua1000;
1204         const char *name;
1205         char usb_path[32];
1206         int err;
1207
1208         is_ua1000 = usb_id->idProduct == 0x0044;
1209
1210         if (interface->altsetting->desc.bInterfaceNumber !=
1211             intf_numbers[is_ua1000][0])
1212                 return -ENODEV;
1213
1214         mutex_lock(&devices_mutex);
1215
1216         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1217                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1218                         break;
1219         if (card_index >= SNDRV_CARDS) {
1220                 mutex_unlock(&devices_mutex);
1221                 return -ENOENT;
1222         }
1223         err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1224                               sizeof(*ua), &card);
1225         if (err < 0) {
1226                 mutex_unlock(&devices_mutex);
1227                 return err;
1228         }
1229         card->private_free = ua101_card_free;
1230         ua = card->private_data;
1231         ua->dev = interface_to_usbdev(interface);
1232         ua->card = card;
1233         ua->card_index = card_index;
1234         INIT_LIST_HEAD(&ua->midi_list);
1235         spin_lock_init(&ua->lock);
1236         mutex_init(&ua->mutex);
1237         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1238         tasklet_init(&ua->playback_tasklet,
1239                      playback_tasklet, (unsigned long)ua);
1240         init_waitqueue_head(&ua->alsa_capture_wait);
1241         init_waitqueue_head(&ua->rate_feedback_wait);
1242         init_waitqueue_head(&ua->alsa_playback_wait);
1243
1244         ua->intf[0] = interface;
1245         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1246                 ua->intf[i] = usb_ifnum_to_if(ua->dev,
1247                                               intf_numbers[is_ua1000][i]);
1248                 if (!ua->intf[i]) {
1249                         dev_err(&ua->dev->dev, "interface %u not found\n",
1250                                 intf_numbers[is_ua1000][i]);
1251                         err = -ENXIO;
1252                         goto probe_error;
1253                 }
1254                 err = usb_driver_claim_interface(&ua101_driver,
1255                                                  ua->intf[i], ua);
1256                 if (err < 0) {
1257                         ua->intf[i] = NULL;
1258                         err = -EBUSY;
1259                         goto probe_error;
1260                 }
1261         }
1262
1263         snd_card_set_dev(card, &interface->dev);
1264
1265         err = detect_usb_format(ua);
1266         if (err < 0)
1267                 goto probe_error;
1268
1269         name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1270         strcpy(card->driver, "UA-101");
1271         strcpy(card->shortname, name);
1272         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1273         snprintf(ua->card->longname, sizeof(ua->card->longname),
1274                  "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1275                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1276                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1277
1278         err = alloc_stream_buffers(ua, &ua->capture);
1279         if (err < 0)
1280                 goto probe_error;
1281         err = alloc_stream_buffers(ua, &ua->playback);
1282         if (err < 0)
1283                 goto probe_error;
1284
1285         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1286         if (err < 0)
1287                 goto probe_error;
1288         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1289         if (err < 0)
1290                 goto probe_error;
1291
1292         err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1293         if (err < 0)
1294                 goto probe_error;
1295         ua->pcm->private_data = ua;
1296         strcpy(ua->pcm->name, name);
1297         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1298         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1299
1300         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1301                                  &ua->midi_list, &midi_quirk);
1302         if (err < 0)
1303                 goto probe_error;
1304
1305         err = snd_card_register(card);
1306         if (err < 0)
1307                 goto probe_error;
1308
1309         usb_set_intfdata(interface, ua);
1310         devices_used |= 1 << card_index;
1311
1312         mutex_unlock(&devices_mutex);
1313         return 0;
1314
1315 probe_error:
1316         free_usb_related_resources(ua, interface);
1317         snd_card_free(card);
1318         mutex_unlock(&devices_mutex);
1319         return err;
1320 }
1321
1322 static void ua101_disconnect(struct usb_interface *interface)
1323 {
1324         struct ua101 *ua = usb_get_intfdata(interface);
1325         struct list_head *midi;
1326
1327         if (!ua)
1328                 return;
1329
1330         mutex_lock(&devices_mutex);
1331
1332         set_bit(DISCONNECTED, &ua->states);
1333         wake_up(&ua->rate_feedback_wait);
1334
1335         /* make sure that userspace cannot create new requests */
1336         snd_card_disconnect(ua->card);
1337
1338         /* make sure that there are no pending USB requests */
1339         __list_for_each(midi, &ua->midi_list)
1340                 snd_usbmidi_disconnect(midi);
1341         abort_alsa_playback(ua);
1342         abort_alsa_capture(ua);
1343         mutex_lock(&ua->mutex);
1344         stop_usb_playback(ua);
1345         stop_usb_capture(ua);
1346         mutex_unlock(&ua->mutex);
1347
1348         free_usb_related_resources(ua, interface);
1349
1350         devices_used &= ~(1 << ua->card_index);
1351
1352         snd_card_free_when_closed(ua->card);
1353
1354         mutex_unlock(&devices_mutex);
1355 }
1356
1357 static struct usb_device_id ua101_ids[] = {
1358         { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1359         { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1360         { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1361         { }
1362 };
1363 MODULE_DEVICE_TABLE(usb, ua101_ids);
1364
1365 static struct usb_driver ua101_driver = {
1366         .name = "snd-ua101",
1367         .id_table = ua101_ids,
1368         .probe = ua101_probe,
1369         .disconnect = ua101_disconnect,
1370 #if 0
1371         .suspend = ua101_suspend,
1372         .resume = ua101_resume,
1373 #endif
1374 };
1375
1376 static int __init alsa_card_ua101_init(void)
1377 {
1378         return usb_register(&ua101_driver);
1379 }
1380
1381 static void __exit alsa_card_ua101_exit(void)
1382 {
1383         usb_deregister(&ua101_driver);
1384         mutex_destroy(&devices_mutex);
1385 }
1386
1387 module_init(alsa_card_ua101_init);
1388 module_exit(alsa_card_ua101_exit);