linux/sound/usb/misc/ua101.c
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   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
  29MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  30MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  31MODULE_LICENSE("GPL v2");
  32MODULE_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
  53static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  54static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  55static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  56static unsigned int queue_length = 21;
  57
  58module_param_array(index, int, NULL, 0444);
  59MODULE_PARM_DESC(index, "card index");
  60module_param_array(id, charp, NULL, 0444);
  61MODULE_PARM_DESC(id, "ID string");
  62module_param_array(enable, bool, NULL, 0444);
  63MODULE_PARM_DESC(enable, "enable card");
  64module_param(queue_length, uint, 0644);
  65MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  66                 __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  67
  68enum {
  69        INTF_PLAYBACK,
  70        INTF_CAPTURE,
  71        INTF_MIDI,
  72
  73        INTF_COUNT
  74};
  75
  76/* bits in struct ua101::states */
  77enum {
  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
  89struct 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
 135static DEFINE_MUTEX(devices_mutex);
 136static unsigned int devices_used;
 137static struct usb_driver ua101_driver;
 138
 139static void abort_alsa_playback(struct ua101 *ua);
 140static void abort_alsa_capture(struct ua101 *ua);
 141
 142static 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
 167static 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
 175static 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
 181static 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
 209static 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 */
 221static 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
 252static 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
 260static 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 */
 325static 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
 357static 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
 424stream_stopped:
 425        abort_usb_playback(ua);
 426        abort_usb_capture(ua);
 427        abort_alsa_playback(ua);
 428        abort_alsa_capture(ua);
 429}
 430
 431static 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
 442static 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
 457static void kill_stream_urbs(struct ua101_stream *stream)
 458{
 459        unsigned int i;
 460
 461        for (i = 0; i < stream->queue_length; ++i)
 462                if (stream->urbs[i])
 463                        usb_kill_urb(&stream->urbs[i]->urb);
 464}
 465
 466static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 467{
 468        struct usb_host_interface *alts;
 469
 470        alts = ua->intf[intf_index]->cur_altsetting;
 471        if (alts->desc.bAlternateSetting != 1) {
 472                int err = usb_set_interface(ua->dev,
 473                                            alts->desc.bInterfaceNumber, 1);
 474                if (err < 0) {
 475                        dev_err(&ua->dev->dev,
 476                                "cannot initialize interface; error %d: %s\n",
 477                                err, usb_error_string(err));
 478                        return err;
 479                }
 480        }
 481        return 0;
 482}
 483
 484static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 485{
 486        struct usb_host_interface *alts;
 487
 488        if (!ua->intf[intf_index])
 489                return;
 490
 491        alts = ua->intf[intf_index]->cur_altsetting;
 492        if (alts->desc.bAlternateSetting != 0) {
 493                int err = usb_set_interface(ua->dev,
 494                                            alts->desc.bInterfaceNumber, 0);
 495                if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 496                        dev_warn(&ua->dev->dev,
 497                                 "interface reset failed; error %d: %s\n",
 498                                 err, usb_error_string(err));
 499        }
 500}
 501
 502static void stop_usb_capture(struct ua101 *ua)
 503{
 504        clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 505
 506        kill_stream_urbs(&ua->capture);
 507
 508        disable_iso_interface(ua, INTF_CAPTURE);
 509}
 510
 511static int start_usb_capture(struct ua101 *ua)
 512{
 513        int err;
 514
 515        if (test_bit(DISCONNECTED, &ua->states))
 516                return -ENODEV;
 517
 518        if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 519                return 0;
 520
 521        kill_stream_urbs(&ua->capture);
 522
 523        err = enable_iso_interface(ua, INTF_CAPTURE);
 524        if (err < 0)
 525                return err;
 526
 527        clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 528        ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 529        ua->rate_feedback_start = 0;
 530        ua->rate_feedback_count = 0;
 531
 532        set_bit(USB_CAPTURE_RUNNING, &ua->states);
 533        err = submit_stream_urbs(ua, &ua->capture);
 534        if (err < 0)
 535                stop_usb_capture(ua);
 536        return err;
 537}
 538
 539static void stop_usb_playback(struct ua101 *ua)
 540{
 541        clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 542
 543        kill_stream_urbs(&ua->playback);
 544
 545        tasklet_kill(&ua->playback_tasklet);
 546
 547        disable_iso_interface(ua, INTF_PLAYBACK);
 548}
 549
 550static int start_usb_playback(struct ua101 *ua)
 551{
 552        unsigned int i, frames;
 553        struct urb *urb;
 554        int err = 0;
 555
 556        if (test_bit(DISCONNECTED, &ua->states))
 557                return -ENODEV;
 558
 559        if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 560                return 0;
 561
 562        kill_stream_urbs(&ua->playback);
 563        tasklet_kill(&ua->playback_tasklet);
 564
 565        err = enable_iso_interface(ua, INTF_PLAYBACK);
 566        if (err < 0)
 567                return err;
 568
 569        clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 570        ua->playback.urbs[0]->urb.complete =
 571                first_playback_urb_complete;
 572        spin_lock_irq(&ua->lock);
 573        INIT_LIST_HEAD(&ua->ready_playback_urbs);
 574        spin_unlock_irq(&ua->lock);
 575
 576        /*
 577         * We submit the initial URBs all at once, so we have to wait for the
 578         * packet size FIFO to be full.
 579         */
 580        wait_event(ua->rate_feedback_wait,
 581                   ua->rate_feedback_count >= ua->playback.queue_length ||
 582                   !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 583                   test_bit(DISCONNECTED, &ua->states));
 584        if (test_bit(DISCONNECTED, &ua->states)) {
 585                stop_usb_playback(ua);
 586                return -ENODEV;
 587        }
 588        if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 589                stop_usb_playback(ua);
 590                return -EIO;
 591        }
 592
 593        for (i = 0; i < ua->playback.queue_length; ++i) {
 594                /* all initial URBs contain silence */
 595                spin_lock_irq(&ua->lock);
 596                frames = ua->rate_feedback[ua->rate_feedback_start];
 597                add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 598                ua->rate_feedback_count--;
 599                spin_unlock_irq(&ua->lock);
 600                urb = &ua->playback.urbs[i]->urb;
 601                urb->iso_frame_desc[0].length =
 602                        frames * ua->playback.frame_bytes;
 603                memset(urb->transfer_buffer, 0,
 604                       urb->iso_frame_desc[0].length);
 605        }
 606
 607        set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 608        err = submit_stream_urbs(ua, &ua->playback);
 609        if (err < 0)
 610                stop_usb_playback(ua);
 611        return err;
 612}
 613
 614static void abort_alsa_capture(struct ua101 *ua)
 615{
 616        if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 617                snd_pcm_stop_xrun(ua->capture.substream);
 618}
 619
 620static void abort_alsa_playback(struct ua101 *ua)
 621{
 622        if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 623                snd_pcm_stop_xrun(ua->playback.substream);
 624}
 625
 626static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 627                         unsigned int channels)
 628{
 629        int err;
 630
 631        substream->runtime->hw.info =
 632                SNDRV_PCM_INFO_MMAP |
 633                SNDRV_PCM_INFO_MMAP_VALID |
 634                SNDRV_PCM_INFO_BATCH |
 635                SNDRV_PCM_INFO_INTERLEAVED |
 636                SNDRV_PCM_INFO_BLOCK_TRANSFER |
 637                SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 638        substream->runtime->hw.formats = ua->format_bit;
 639        substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 640        substream->runtime->hw.rate_min = ua->rate;
 641        substream->runtime->hw.rate_max = ua->rate;
 642        substream->runtime->hw.channels_min = channels;
 643        substream->runtime->hw.channels_max = channels;
 644        substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 645        substream->runtime->hw.period_bytes_min = 1;
 646        substream->runtime->hw.period_bytes_max = UINT_MAX;
 647        substream->runtime->hw.periods_min = 2;
 648        substream->runtime->hw.periods_max = UINT_MAX;
 649        err = snd_pcm_hw_constraint_minmax(substream->runtime,
 650                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 651                                           1500000 / ua->packets_per_second,
 652                                           UINT_MAX);
 653        if (err < 0)
 654                return err;
 655        err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 656        return err;
 657}
 658
 659static int capture_pcm_open(struct snd_pcm_substream *substream)
 660{
 661        struct ua101 *ua = substream->private_data;
 662        int err;
 663
 664        ua->capture.substream = substream;
 665        err = set_stream_hw(ua, substream, ua->capture.channels);
 666        if (err < 0)
 667                return err;
 668        substream->runtime->hw.fifo_size =
 669                DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 670        substream->runtime->delay = substream->runtime->hw.fifo_size;
 671
 672        mutex_lock(&ua->mutex);
 673        err = start_usb_capture(ua);
 674        if (err >= 0)
 675                set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 676        mutex_unlock(&ua->mutex);
 677        return err;
 678}
 679
 680static int playback_pcm_open(struct snd_pcm_substream *substream)
 681{
 682        struct ua101 *ua = substream->private_data;
 683        int err;
 684
 685        ua->playback.substream = substream;
 686        err = set_stream_hw(ua, substream, ua->playback.channels);
 687        if (err < 0)
 688                return err;
 689        substream->runtime->hw.fifo_size =
 690                DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 691                                  ua->packets_per_second);
 692
 693        mutex_lock(&ua->mutex);
 694        err = start_usb_capture(ua);
 695        if (err < 0)
 696                goto error;
 697        err = start_usb_playback(ua);
 698        if (err < 0) {
 699                if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 700                        stop_usb_capture(ua);
 701                goto error;
 702        }
 703        set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 704error:
 705        mutex_unlock(&ua->mutex);
 706        return err;
 707}
 708
 709static int capture_pcm_close(struct snd_pcm_substream *substream)
 710{
 711        struct ua101 *ua = substream->private_data;
 712
 713        mutex_lock(&ua->mutex);
 714        clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 715        if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 716                stop_usb_capture(ua);
 717        mutex_unlock(&ua->mutex);
 718        return 0;
 719}
 720
 721static int playback_pcm_close(struct snd_pcm_substream *substream)
 722{
 723        struct ua101 *ua = substream->private_data;
 724
 725        mutex_lock(&ua->mutex);
 726        stop_usb_playback(ua);
 727        clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 728        if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 729                stop_usb_capture(ua);
 730        mutex_unlock(&ua->mutex);
 731        return 0;
 732}
 733
 734static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 735                                 struct snd_pcm_hw_params *hw_params)
 736{
 737        struct ua101 *ua = substream->private_data;
 738        int err;
 739
 740        mutex_lock(&ua->mutex);
 741        err = start_usb_capture(ua);
 742        mutex_unlock(&ua->mutex);
 743        if (err < 0)
 744                return err;
 745
 746        return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 747                                                params_buffer_bytes(hw_params));
 748}
 749
 750static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 751                                  struct snd_pcm_hw_params *hw_params)
 752{
 753        struct ua101 *ua = substream->private_data;
 754        int err;
 755
 756        mutex_lock(&ua->mutex);
 757        err = start_usb_capture(ua);
 758        if (err >= 0)
 759                err = start_usb_playback(ua);
 760        mutex_unlock(&ua->mutex);
 761        if (err < 0)
 762                return err;
 763
 764        return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 765                                                params_buffer_bytes(hw_params));
 766}
 767
 768static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 769{
 770        return snd_pcm_lib_free_vmalloc_buffer(substream);
 771}
 772
 773static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 774{
 775        struct ua101 *ua = substream->private_data;
 776        int err;
 777
 778        mutex_lock(&ua->mutex);
 779        err = start_usb_capture(ua);
 780        mutex_unlock(&ua->mutex);
 781        if (err < 0)
 782                return err;
 783
 784        /*
 785         * The EHCI driver schedules the first packet of an iso stream at 10 ms
 786         * in the future, i.e., no data is actually captured for that long.
 787         * Take the wait here so that the stream is known to be actually
 788         * running when the start trigger has been called.
 789         */
 790        wait_event(ua->alsa_capture_wait,
 791                   test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 792                   !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 793        if (test_bit(DISCONNECTED, &ua->states))
 794                return -ENODEV;
 795        if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 796                return -EIO;
 797
 798        ua->capture.period_pos = 0;
 799        ua->capture.buffer_pos = 0;
 800        return 0;
 801}
 802
 803static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 804{
 805        struct ua101 *ua = substream->private_data;
 806        int err;
 807
 808        mutex_lock(&ua->mutex);
 809        err = start_usb_capture(ua);
 810        if (err >= 0)
 811                err = start_usb_playback(ua);
 812        mutex_unlock(&ua->mutex);
 813        if (err < 0)
 814                return err;
 815
 816        /* see the comment in capture_pcm_prepare() */
 817        wait_event(ua->alsa_playback_wait,
 818                   test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 819                   !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 820        if (test_bit(DISCONNECTED, &ua->states))
 821                return -ENODEV;
 822        if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 823                return -EIO;
 824
 825        substream->runtime->delay = 0;
 826        ua->playback.period_pos = 0;
 827        ua->playback.buffer_pos = 0;
 828        return 0;
 829}
 830
 831static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 832{
 833        struct ua101 *ua = substream->private_data;
 834
 835        switch (cmd) {
 836        case SNDRV_PCM_TRIGGER_START:
 837                if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 838                        return -EIO;
 839                set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 840                return 0;
 841        case SNDRV_PCM_TRIGGER_STOP:
 842                clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 843                return 0;
 844        default:
 845                return -EINVAL;
 846        }
 847}
 848
 849static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 850{
 851        struct ua101 *ua = substream->private_data;
 852
 853        switch (cmd) {
 854        case SNDRV_PCM_TRIGGER_START:
 855                if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 856                        return -EIO;
 857                set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 858                return 0;
 859        case SNDRV_PCM_TRIGGER_STOP:
 860                clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 861                return 0;
 862        default:
 863                return -EINVAL;
 864        }
 865}
 866
 867static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 868                                                  struct ua101_stream *stream)
 869{
 870        unsigned long flags;
 871        unsigned int pos;
 872
 873        spin_lock_irqsave(&ua->lock, flags);
 874        pos = stream->buffer_pos;
 875        spin_unlock_irqrestore(&ua->lock, flags);
 876        return pos;
 877}
 878
 879static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 880{
 881        struct ua101 *ua = subs->private_data;
 882
 883        return ua101_pcm_pointer(ua, &ua->capture);
 884}
 885
 886static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 887{
 888        struct ua101 *ua = subs->private_data;
 889
 890        return ua101_pcm_pointer(ua, &ua->playback);
 891}
 892
 893static struct snd_pcm_ops capture_pcm_ops = {
 894        .open = capture_pcm_open,
 895        .close = capture_pcm_close,
 896        .ioctl = snd_pcm_lib_ioctl,
 897        .hw_params = capture_pcm_hw_params,
 898        .hw_free = ua101_pcm_hw_free,
 899        .prepare = capture_pcm_prepare,
 900        .trigger = capture_pcm_trigger,
 901        .pointer = capture_pcm_pointer,
 902        .page = snd_pcm_lib_get_vmalloc_page,
 903        .mmap = snd_pcm_lib_mmap_vmalloc,
 904};
 905
 906static struct snd_pcm_ops playback_pcm_ops = {
 907        .open = playback_pcm_open,
 908        .close = playback_pcm_close,
 909        .ioctl = snd_pcm_lib_ioctl,
 910        .hw_params = playback_pcm_hw_params,
 911        .hw_free = ua101_pcm_hw_free,
 912        .prepare = playback_pcm_prepare,
 913        .trigger = playback_pcm_trigger,
 914        .pointer = playback_pcm_pointer,
 915        .page = snd_pcm_lib_get_vmalloc_page,
 916        .mmap = snd_pcm_lib_mmap_vmalloc,
 917};
 918
 919static const struct uac_format_type_i_discrete_descriptor *
 920find_format_descriptor(struct usb_interface *interface)
 921{
 922        struct usb_host_interface *alt;
 923        u8 *extra;
 924        int extralen;
 925
 926        if (interface->num_altsetting != 2) {
 927                dev_err(&interface->dev, "invalid num_altsetting\n");
 928                return NULL;
 929        }
 930
 931        alt = &interface->altsetting[0];
 932        if (alt->desc.bNumEndpoints != 0) {
 933                dev_err(&interface->dev, "invalid bNumEndpoints\n");
 934                return NULL;
 935        }
 936
 937        alt = &interface->altsetting[1];
 938        if (alt->desc.bNumEndpoints != 1) {
 939                dev_err(&interface->dev, "invalid bNumEndpoints\n");
 940                return NULL;
 941        }
 942
 943        extra = alt->extra;
 944        extralen = alt->extralen;
 945        while (extralen >= sizeof(struct usb_descriptor_header)) {
 946                struct uac_format_type_i_discrete_descriptor *desc;
 947
 948                desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 949                if (desc->bLength > extralen) {
 950                        dev_err(&interface->dev, "descriptor overflow\n");
 951                        return NULL;
 952                }
 953                if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 954                    desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 955                    desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 956                        if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 957                            desc->bSamFreqType != 1) {
 958                                dev_err(&interface->dev,
 959                                        "invalid format type\n");
 960                                return NULL;
 961                        }
 962                        return desc;
 963                }
 964                extralen -= desc->bLength;
 965                extra += desc->bLength;
 966        }
 967        dev_err(&interface->dev, "sample format descriptor not found\n");
 968        return NULL;
 969}
 970
 971static int detect_usb_format(struct ua101 *ua)
 972{
 973        const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 974        const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 975        const struct usb_endpoint_descriptor *epd;
 976        unsigned int rate2;
 977
 978        fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 979        fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 980        if (!fmt_capture || !fmt_playback)
 981                return -ENXIO;
 982
 983        switch (fmt_capture->bSubframeSize) {
 984        case 3:
 985                ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 986                break;
 987        case 4:
 988                ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 989                break;
 990        default:
 991                dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 992                return -ENXIO;
 993        }
 994        if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 995                dev_err(&ua->dev->dev,
 996                        "playback/capture sample widths do not match\n");
 997                return -ENXIO;
 998        }
 999
1000        if (fmt_capture->bBitResolution != 24 ||
1001            fmt_playback->bBitResolution != 24) {
1002                dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
1003                return -ENXIO;
1004        }
1005
1006        ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1007        rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1008        if (ua->rate != rate2) {
1009                dev_err(&ua->dev->dev,
1010                        "playback/capture rates do not match: %u/%u\n",
1011                        rate2, ua->rate);
1012                return -ENXIO;
1013        }
1014
1015        switch (ua->dev->speed) {
1016        case USB_SPEED_FULL:
1017                ua->packets_per_second = 1000;
1018                break;
1019        case USB_SPEED_HIGH:
1020                ua->packets_per_second = 8000;
1021                break;
1022        default:
1023                dev_err(&ua->dev->dev, "unknown device speed\n");
1024                return -ENXIO;
1025        }
1026
1027        ua->capture.channels = fmt_capture->bNrChannels;
1028        ua->playback.channels = fmt_playback->bNrChannels;
1029        ua->capture.frame_bytes =
1030                fmt_capture->bSubframeSize * ua->capture.channels;
1031        ua->playback.frame_bytes =
1032                fmt_playback->bSubframeSize * ua->playback.channels;
1033
1034        epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1035        if (!usb_endpoint_is_isoc_in(epd)) {
1036                dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1037                return -ENXIO;
1038        }
1039        ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1040        ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1041
1042        epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1043        if (!usb_endpoint_is_isoc_out(epd)) {
1044                dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1045                return -ENXIO;
1046        }
1047        ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1048        ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1049        return 0;
1050}
1051
1052static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1053{
1054        unsigned int remaining_packets, packets, packets_per_page, i;
1055        size_t size;
1056
1057        stream->queue_length = queue_length;
1058        stream->queue_length = max(stream->queue_length,
1059                                   (unsigned int)MIN_QUEUE_LENGTH);
1060        stream->queue_length = min(stream->queue_length,
1061                                   (unsigned int)MAX_QUEUE_LENGTH);
1062
1063        /*
1064         * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1065         * quite bad when used with the packet sizes of this device (e.g. 280,
1066         * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1067         * a smaller buffer only for the last chunk.
1068         */
1069        remaining_packets = stream->queue_length;
1070        packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1071        for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1072                packets = min(remaining_packets, packets_per_page);
1073                size = packets * stream->max_packet_bytes;
1074                stream->buffers[i].addr =
1075                        usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1076                                           &stream->buffers[i].dma);
1077                if (!stream->buffers[i].addr)
1078                        return -ENOMEM;
1079                stream->buffers[i].size = size;
1080                remaining_packets -= packets;
1081                if (!remaining_packets)
1082                        break;
1083        }
1084        if (remaining_packets) {
1085                dev_err(&ua->dev->dev, "too many packets\n");
1086                return -ENXIO;
1087        }
1088        return 0;
1089}
1090
1091static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1092{
1093        unsigned int i;
1094
1095        for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1096                usb_free_coherent(ua->dev,
1097                                  stream->buffers[i].size,
1098                                  stream->buffers[i].addr,
1099                                  stream->buffers[i].dma);
1100}
1101
1102static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1103                             void (*urb_complete)(struct urb *))
1104{
1105        unsigned max_packet_size = stream->max_packet_bytes;
1106        struct ua101_urb *urb;
1107        unsigned int b, u = 0;
1108
1109        for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1110                unsigned int size = stream->buffers[b].size;
1111                u8 *addr = stream->buffers[b].addr;
1112                dma_addr_t dma = stream->buffers[b].dma;
1113
1114                while (size >= max_packet_size) {
1115                        if (u >= stream->queue_length)
1116                                goto bufsize_error;
1117                        urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1118                        if (!urb)
1119                                return -ENOMEM;
1120                        usb_init_urb(&urb->urb);
1121                        urb->urb.dev = ua->dev;
1122                        urb->urb.pipe = stream->usb_pipe;
1123                        urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1124                        urb->urb.transfer_buffer = addr;
1125                        urb->urb.transfer_dma = dma;
1126                        urb->urb.transfer_buffer_length = max_packet_size;
1127                        urb->urb.number_of_packets = 1;
1128                        urb->urb.interval = 1;
1129                        urb->urb.context = ua;
1130                        urb->urb.complete = urb_complete;
1131                        urb->urb.iso_frame_desc[0].offset = 0;
1132                        urb->urb.iso_frame_desc[0].length = max_packet_size;
1133                        stream->urbs[u++] = urb;
1134                        size -= max_packet_size;
1135                        addr += max_packet_size;
1136                        dma += max_packet_size;
1137                }
1138        }
1139        if (u == stream->queue_length)
1140                return 0;
1141bufsize_error:
1142        dev_err(&ua->dev->dev, "internal buffer size error\n");
1143        return -ENXIO;
1144}
1145
1146static void free_stream_urbs(struct ua101_stream *stream)
1147{
1148        unsigned int i;
1149
1150        for (i = 0; i < stream->queue_length; ++i) {
1151                kfree(stream->urbs[i]);
1152                stream->urbs[i] = NULL;
1153        }
1154}
1155
1156static void free_usb_related_resources(struct ua101 *ua,
1157                                       struct usb_interface *interface)
1158{
1159        unsigned int i;
1160        struct usb_interface *intf;
1161
1162        mutex_lock(&ua->mutex);
1163        free_stream_urbs(&ua->capture);
1164        free_stream_urbs(&ua->playback);
1165        mutex_unlock(&ua->mutex);
1166        free_stream_buffers(ua, &ua->capture);
1167        free_stream_buffers(ua, &ua->playback);
1168
1169        for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1170                mutex_lock(&ua->mutex);
1171                intf = ua->intf[i];
1172                ua->intf[i] = NULL;
1173                mutex_unlock(&ua->mutex);
1174                if (intf) {
1175                        usb_set_intfdata(intf, NULL);
1176                        if (intf != interface)
1177                                usb_driver_release_interface(&ua101_driver,
1178                                                             intf);
1179                }
1180        }
1181}
1182
1183static void ua101_card_free(struct snd_card *card)
1184{
1185        struct ua101 *ua = card->private_data;
1186
1187        mutex_destroy(&ua->mutex);
1188}
1189
1190static int ua101_probe(struct usb_interface *interface,
1191                       const struct usb_device_id *usb_id)
1192{
1193        static const struct snd_usb_midi_endpoint_info midi_ep = {
1194                .out_cables = 0x0001,
1195                .in_cables = 0x0001
1196        };
1197        static const struct snd_usb_audio_quirk midi_quirk = {
1198                .type = QUIRK_MIDI_FIXED_ENDPOINT,
1199                .data = &midi_ep
1200        };
1201        static const int intf_numbers[2][3] = {
1202                {       /* UA-101 */
1203                        [INTF_PLAYBACK] = 0,
1204                        [INTF_CAPTURE] = 1,
1205                        [INTF_MIDI] = 2,
1206                },
1207                {       /* UA-1000 */
1208                        [INTF_CAPTURE] = 1,
1209                        [INTF_PLAYBACK] = 2,
1210                        [INTF_MIDI] = 3,
1211                },
1212        };
1213        struct snd_card *card;
1214        struct ua101 *ua;
1215        unsigned int card_index, i;
1216        int is_ua1000;
1217        const char *name;
1218        char usb_path[32];
1219        int err;
1220
1221        is_ua1000 = usb_id->idProduct == 0x0044;
1222
1223        if (interface->altsetting->desc.bInterfaceNumber !=
1224            intf_numbers[is_ua1000][0])
1225                return -ENODEV;
1226
1227        mutex_lock(&devices_mutex);
1228
1229        for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1230                if (enable[card_index] && !(devices_used & (1 << card_index)))
1231                        break;
1232        if (card_index >= SNDRV_CARDS) {
1233                mutex_unlock(&devices_mutex);
1234                return -ENOENT;
1235        }
1236        err = snd_card_new(&interface->dev,
1237                           index[card_index], id[card_index], THIS_MODULE,
1238                           sizeof(*ua), &card);
1239        if (err < 0) {
1240                mutex_unlock(&devices_mutex);
1241                return err;
1242        }
1243        card->private_free = ua101_card_free;
1244        ua = card->private_data;
1245        ua->dev = interface_to_usbdev(interface);
1246        ua->card = card;
1247        ua->card_index = card_index;
1248        INIT_LIST_HEAD(&ua->midi_list);
1249        spin_lock_init(&ua->lock);
1250        mutex_init(&ua->mutex);
1251        INIT_LIST_HEAD(&ua->ready_playback_urbs);
1252        tasklet_init(&ua->playback_tasklet,
1253                     playback_tasklet, (unsigned long)ua);
1254        init_waitqueue_head(&ua->alsa_capture_wait);
1255        init_waitqueue_head(&ua->rate_feedback_wait);
1256        init_waitqueue_head(&ua->alsa_playback_wait);
1257
1258        ua->intf[0] = interface;
1259        for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1260                ua->intf[i] = usb_ifnum_to_if(ua->dev,
1261                                              intf_numbers[is_ua1000][i]);
1262                if (!ua->intf[i]) {
1263                        dev_err(&ua->dev->dev, "interface %u not found\n",
1264                                intf_numbers[is_ua1000][i]);
1265                        err = -ENXIO;
1266                        goto probe_error;
1267                }
1268                err = usb_driver_claim_interface(&ua101_driver,
1269                                                 ua->intf[i], ua);
1270                if (err < 0) {
1271                        ua->intf[i] = NULL;
1272                        err = -EBUSY;
1273                        goto probe_error;
1274                }
1275        }
1276
1277        err = detect_usb_format(ua);
1278        if (err < 0)
1279                goto probe_error;
1280
1281        name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1282        strcpy(card->driver, "UA-101");
1283        strcpy(card->shortname, name);
1284        usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1285        snprintf(ua->card->longname, sizeof(ua->card->longname),
1286                 "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1287                 ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1288                 ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1289
1290        err = alloc_stream_buffers(ua, &ua->capture);
1291        if (err < 0)
1292                goto probe_error;
1293        err = alloc_stream_buffers(ua, &ua->playback);
1294        if (err < 0)
1295                goto probe_error;
1296
1297        err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1298        if (err < 0)
1299                goto probe_error;
1300        err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1301        if (err < 0)
1302                goto probe_error;
1303
1304        err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1305        if (err < 0)
1306                goto probe_error;
1307        ua->pcm->private_data = ua;
1308        strcpy(ua->pcm->name, name);
1309        snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1310        snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1311
1312        err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1313                                 &ua->midi_list, &midi_quirk);
1314        if (err < 0)
1315                goto probe_error;
1316
1317        err = snd_card_register(card);
1318        if (err < 0)
1319                goto probe_error;
1320
1321        usb_set_intfdata(interface, ua);
1322        devices_used |= 1 << card_index;
1323
1324        mutex_unlock(&devices_mutex);
1325        return 0;
1326
1327probe_error:
1328        free_usb_related_resources(ua, interface);
1329        snd_card_free(card);
1330        mutex_unlock(&devices_mutex);
1331        return err;
1332}
1333
1334static void ua101_disconnect(struct usb_interface *interface)
1335{
1336        struct ua101 *ua = usb_get_intfdata(interface);
1337        struct list_head *midi;
1338
1339        if (!ua)
1340                return;
1341
1342        mutex_lock(&devices_mutex);
1343
1344        set_bit(DISCONNECTED, &ua->states);
1345        wake_up(&ua->rate_feedback_wait);
1346
1347        /* make sure that userspace cannot create new requests */
1348        snd_card_disconnect(ua->card);
1349
1350        /* make sure that there are no pending USB requests */
1351        list_for_each(midi, &ua->midi_list)
1352                snd_usbmidi_disconnect(midi);
1353        abort_alsa_playback(ua);
1354        abort_alsa_capture(ua);
1355        mutex_lock(&ua->mutex);
1356        stop_usb_playback(ua);
1357        stop_usb_capture(ua);
1358        mutex_unlock(&ua->mutex);
1359
1360        free_usb_related_resources(ua, interface);
1361
1362        devices_used &= ~(1 << ua->card_index);
1363
1364        snd_card_free_when_closed(ua->card);
1365
1366        mutex_unlock(&devices_mutex);
1367}
1368
1369static struct usb_device_id ua101_ids[] = {
1370        { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1371        { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1372        { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1373        { }
1374};
1375MODULE_DEVICE_TABLE(usb, ua101_ids);
1376
1377static struct usb_driver ua101_driver = {
1378        .name = "snd-ua101",
1379        .id_table = ua101_ids,
1380        .probe = ua101_probe,
1381        .disconnect = ua101_disconnect,
1382#if 0
1383        .suspend = ua101_suspend,
1384        .resume = ua101_resume,
1385#endif
1386};
1387
1388module_usb_driver(ua101_driver);
1389