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        unsigned long flags;
 617
 618        if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states)) {
 619                snd_pcm_stream_lock_irqsave(ua->capture.substream, flags);
 620                snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
 621                snd_pcm_stream_unlock_irqrestore(ua->capture.substream, flags);
 622        }
 623}
 624
 625static void abort_alsa_playback(struct ua101 *ua)
 626{
 627        unsigned long flags;
 628
 629        if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states)) {
 630                snd_pcm_stream_lock_irqsave(ua->playback.substream, flags);
 631                snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
 632                snd_pcm_stream_unlock_irqrestore(ua->playback.substream, flags);
 633        }
 634}
 635
 636static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 637                         unsigned int channels)
 638{
 639        int err;
 640
 641        substream->runtime->hw.info =
 642                SNDRV_PCM_INFO_MMAP |
 643                SNDRV_PCM_INFO_MMAP_VALID |
 644                SNDRV_PCM_INFO_BATCH |
 645                SNDRV_PCM_INFO_INTERLEAVED |
 646                SNDRV_PCM_INFO_BLOCK_TRANSFER |
 647                SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 648        substream->runtime->hw.formats = ua->format_bit;
 649        substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 650        substream->runtime->hw.rate_min = ua->rate;
 651        substream->runtime->hw.rate_max = ua->rate;
 652        substream->runtime->hw.channels_min = channels;
 653        substream->runtime->hw.channels_max = channels;
 654        substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 655        substream->runtime->hw.period_bytes_min = 1;
 656        substream->runtime->hw.period_bytes_max = UINT_MAX;
 657        substream->runtime->hw.periods_min = 2;
 658        substream->runtime->hw.periods_max = UINT_MAX;
 659        err = snd_pcm_hw_constraint_minmax(substream->runtime,
 660                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 661                                           1500000 / ua->packets_per_second,
 662                                           UINT_MAX);
 663        if (err < 0)
 664                return err;
 665        err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 666        return err;
 667}
 668
 669static int capture_pcm_open(struct snd_pcm_substream *substream)
 670{
 671        struct ua101 *ua = substream->private_data;
 672        int err;
 673
 674        ua->capture.substream = substream;
 675        err = set_stream_hw(ua, substream, ua->capture.channels);
 676        if (err < 0)
 677                return err;
 678        substream->runtime->hw.fifo_size =
 679                DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 680        substream->runtime->delay = substream->runtime->hw.fifo_size;
 681
 682        mutex_lock(&ua->mutex);
 683        err = start_usb_capture(ua);
 684        if (err >= 0)
 685                set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 686        mutex_unlock(&ua->mutex);
 687        return err;
 688}
 689
 690static int playback_pcm_open(struct snd_pcm_substream *substream)
 691{
 692        struct ua101 *ua = substream->private_data;
 693        int err;
 694
 695        ua->playback.substream = substream;
 696        err = set_stream_hw(ua, substream, ua->playback.channels);
 697        if (err < 0)
 698                return err;
 699        substream->runtime->hw.fifo_size =
 700                DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 701                                  ua->packets_per_second);
 702
 703        mutex_lock(&ua->mutex);
 704        err = start_usb_capture(ua);
 705        if (err < 0)
 706                goto error;
 707        err = start_usb_playback(ua);
 708        if (err < 0) {
 709                if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 710                        stop_usb_capture(ua);
 711                goto error;
 712        }
 713        set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 714error:
 715        mutex_unlock(&ua->mutex);
 716        return err;
 717}
 718
 719static int capture_pcm_close(struct snd_pcm_substream *substream)
 720{
 721        struct ua101 *ua = substream->private_data;
 722
 723        mutex_lock(&ua->mutex);
 724        clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 725        if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 726                stop_usb_capture(ua);
 727        mutex_unlock(&ua->mutex);
 728        return 0;
 729}
 730
 731static int playback_pcm_close(struct snd_pcm_substream *substream)
 732{
 733        struct ua101 *ua = substream->private_data;
 734
 735        mutex_lock(&ua->mutex);
 736        stop_usb_playback(ua);
 737        clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 738        if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 739                stop_usb_capture(ua);
 740        mutex_unlock(&ua->mutex);
 741        return 0;
 742}
 743
 744static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 745                                 struct snd_pcm_hw_params *hw_params)
 746{
 747        struct ua101 *ua = substream->private_data;
 748        int err;
 749
 750        mutex_lock(&ua->mutex);
 751        err = start_usb_capture(ua);
 752        mutex_unlock(&ua->mutex);
 753        if (err < 0)
 754                return err;
 755
 756        return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 757                                                params_buffer_bytes(hw_params));
 758}
 759
 760static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 761                                  struct snd_pcm_hw_params *hw_params)
 762{
 763        struct ua101 *ua = substream->private_data;
 764        int err;
 765
 766        mutex_lock(&ua->mutex);
 767        err = start_usb_capture(ua);
 768        if (err >= 0)
 769                err = start_usb_playback(ua);
 770        mutex_unlock(&ua->mutex);
 771        if (err < 0)
 772                return err;
 773
 774        return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 775                                                params_buffer_bytes(hw_params));
 776}
 777
 778static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 779{
 780        return snd_pcm_lib_free_vmalloc_buffer(substream);
 781}
 782
 783static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 784{
 785        struct ua101 *ua = substream->private_data;
 786        int err;
 787
 788        mutex_lock(&ua->mutex);
 789        err = start_usb_capture(ua);
 790        mutex_unlock(&ua->mutex);
 791        if (err < 0)
 792                return err;
 793
 794        /*
 795         * The EHCI driver schedules the first packet of an iso stream at 10 ms
 796         * in the future, i.e., no data is actually captured for that long.
 797         * Take the wait here so that the stream is known to be actually
 798         * running when the start trigger has been called.
 799         */
 800        wait_event(ua->alsa_capture_wait,
 801                   test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 802                   !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 803        if (test_bit(DISCONNECTED, &ua->states))
 804                return -ENODEV;
 805        if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 806                return -EIO;
 807
 808        ua->capture.period_pos = 0;
 809        ua->capture.buffer_pos = 0;
 810        return 0;
 811}
 812
 813static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 814{
 815        struct ua101 *ua = substream->private_data;
 816        int err;
 817
 818        mutex_lock(&ua->mutex);
 819        err = start_usb_capture(ua);
 820        if (err >= 0)
 821                err = start_usb_playback(ua);
 822        mutex_unlock(&ua->mutex);
 823        if (err < 0)
 824                return err;
 825
 826        /* see the comment in capture_pcm_prepare() */
 827        wait_event(ua->alsa_playback_wait,
 828                   test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 829                   !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 830        if (test_bit(DISCONNECTED, &ua->states))
 831                return -ENODEV;
 832        if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 833                return -EIO;
 834
 835        substream->runtime->delay = 0;
 836        ua->playback.period_pos = 0;
 837        ua->playback.buffer_pos = 0;
 838        return 0;
 839}
 840
 841static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 842{
 843        struct ua101 *ua = substream->private_data;
 844
 845        switch (cmd) {
 846        case SNDRV_PCM_TRIGGER_START:
 847                if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 848                        return -EIO;
 849                set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 850                return 0;
 851        case SNDRV_PCM_TRIGGER_STOP:
 852                clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 853                return 0;
 854        default:
 855                return -EINVAL;
 856        }
 857}
 858
 859static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 860{
 861        struct ua101 *ua = substream->private_data;
 862
 863        switch (cmd) {
 864        case SNDRV_PCM_TRIGGER_START:
 865                if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 866                        return -EIO;
 867                set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 868                return 0;
 869        case SNDRV_PCM_TRIGGER_STOP:
 870                clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 871                return 0;
 872        default:
 873                return -EINVAL;
 874        }
 875}
 876
 877static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 878                                                  struct ua101_stream *stream)
 879{
 880        unsigned long flags;
 881        unsigned int pos;
 882
 883        spin_lock_irqsave(&ua->lock, flags);
 884        pos = stream->buffer_pos;
 885        spin_unlock_irqrestore(&ua->lock, flags);
 886        return pos;
 887}
 888
 889static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 890{
 891        struct ua101 *ua = subs->private_data;
 892
 893        return ua101_pcm_pointer(ua, &ua->capture);
 894}
 895
 896static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 897{
 898        struct ua101 *ua = subs->private_data;
 899
 900        return ua101_pcm_pointer(ua, &ua->playback);
 901}
 902
 903static struct snd_pcm_ops capture_pcm_ops = {
 904        .open = capture_pcm_open,
 905        .close = capture_pcm_close,
 906        .ioctl = snd_pcm_lib_ioctl,
 907        .hw_params = capture_pcm_hw_params,
 908        .hw_free = ua101_pcm_hw_free,
 909        .prepare = capture_pcm_prepare,
 910        .trigger = capture_pcm_trigger,
 911        .pointer = capture_pcm_pointer,
 912        .page = snd_pcm_lib_get_vmalloc_page,
 913        .mmap = snd_pcm_lib_mmap_vmalloc,
 914};
 915
 916static struct snd_pcm_ops playback_pcm_ops = {
 917        .open = playback_pcm_open,
 918        .close = playback_pcm_close,
 919        .ioctl = snd_pcm_lib_ioctl,
 920        .hw_params = playback_pcm_hw_params,
 921        .hw_free = ua101_pcm_hw_free,
 922        .prepare = playback_pcm_prepare,
 923        .trigger = playback_pcm_trigger,
 924        .pointer = playback_pcm_pointer,
 925        .page = snd_pcm_lib_get_vmalloc_page,
 926        .mmap = snd_pcm_lib_mmap_vmalloc,
 927};
 928
 929static const struct uac_format_type_i_discrete_descriptor *
 930find_format_descriptor(struct usb_interface *interface)
 931{
 932        struct usb_host_interface *alt;
 933        u8 *extra;
 934        int extralen;
 935
 936        if (interface->num_altsetting != 2) {
 937                dev_err(&interface->dev, "invalid num_altsetting\n");
 938                return NULL;
 939        }
 940
 941        alt = &interface->altsetting[0];
 942        if (alt->desc.bNumEndpoints != 0) {
 943                dev_err(&interface->dev, "invalid bNumEndpoints\n");
 944                return NULL;
 945        }
 946
 947        alt = &interface->altsetting[1];
 948        if (alt->desc.bNumEndpoints != 1) {
 949                dev_err(&interface->dev, "invalid bNumEndpoints\n");
 950                return NULL;
 951        }
 952
 953        extra = alt->extra;
 954        extralen = alt->extralen;
 955        while (extralen >= sizeof(struct usb_descriptor_header)) {
 956                struct uac_format_type_i_discrete_descriptor *desc;
 957
 958                desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 959                if (desc->bLength > extralen) {
 960                        dev_err(&interface->dev, "descriptor overflow\n");
 961                        return NULL;
 962                }
 963                if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 964                    desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 965                    desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 966                        if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 967                            desc->bSamFreqType != 1) {
 968                                dev_err(&interface->dev,
 969                                        "invalid format type\n");
 970                                return NULL;
 971                        }
 972                        return desc;
 973                }
 974                extralen -= desc->bLength;
 975                extra += desc->bLength;
 976        }
 977        dev_err(&interface->dev, "sample format descriptor not found\n");
 978        return NULL;
 979}
 980
 981static int detect_usb_format(struct ua101 *ua)
 982{
 983        const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 984        const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 985        const struct usb_endpoint_descriptor *epd;
 986        unsigned int rate2;
 987
 988        fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 989        fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 990        if (!fmt_capture || !fmt_playback)
 991                return -ENXIO;
 992
 993        switch (fmt_capture->bSubframeSize) {
 994        case 3:
 995                ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 996                break;
 997        case 4:
 998                ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 999                break;
1000        default:
1001                dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
1002                return -ENXIO;
1003        }
1004        if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
1005                dev_err(&ua->dev->dev,
1006                        "playback/capture sample widths do not match\n");
1007                return -ENXIO;
1008        }
1009
1010        if (fmt_capture->bBitResolution != 24 ||
1011            fmt_playback->bBitResolution != 24) {
1012                dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
1013                return -ENXIO;
1014        }
1015
1016        ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1017        rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1018        if (ua->rate != rate2) {
1019                dev_err(&ua->dev->dev,
1020                        "playback/capture rates do not match: %u/%u\n",
1021                        rate2, ua->rate);
1022                return -ENXIO;
1023        }
1024
1025        switch (ua->dev->speed) {
1026        case USB_SPEED_FULL:
1027                ua->packets_per_second = 1000;
1028                break;
1029        case USB_SPEED_HIGH:
1030                ua->packets_per_second = 8000;
1031                break;
1032        default:
1033                dev_err(&ua->dev->dev, "unknown device speed\n");
1034                return -ENXIO;
1035        }
1036
1037        ua->capture.channels = fmt_capture->bNrChannels;
1038        ua->playback.channels = fmt_playback->bNrChannels;
1039        ua->capture.frame_bytes =
1040                fmt_capture->bSubframeSize * ua->capture.channels;
1041        ua->playback.frame_bytes =
1042                fmt_playback->bSubframeSize * ua->playback.channels;
1043
1044        epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1045        if (!usb_endpoint_is_isoc_in(epd)) {
1046                dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1047                return -ENXIO;
1048        }
1049        ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1050        ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1051
1052        epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1053        if (!usb_endpoint_is_isoc_out(epd)) {
1054                dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1055                return -ENXIO;
1056        }
1057        ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1058        ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1059        return 0;
1060}
1061
1062static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1063{
1064        unsigned int remaining_packets, packets, packets_per_page, i;
1065        size_t size;
1066
1067        stream->queue_length = queue_length;
1068        stream->queue_length = max(stream->queue_length,
1069                                   (unsigned int)MIN_QUEUE_LENGTH);
1070        stream->queue_length = min(stream->queue_length,
1071                                   (unsigned int)MAX_QUEUE_LENGTH);
1072
1073        /*
1074         * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1075         * quite bad when used with the packet sizes of this device (e.g. 280,
1076         * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1077         * a smaller buffer only for the last chunk.
1078         */
1079        remaining_packets = stream->queue_length;
1080        packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1081        for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1082                packets = min(remaining_packets, packets_per_page);
1083                size = packets * stream->max_packet_bytes;
1084                stream->buffers[i].addr =
1085                        usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1086                                           &stream->buffers[i].dma);
1087                if (!stream->buffers[i].addr)
1088                        return -ENOMEM;
1089                stream->buffers[i].size = size;
1090                remaining_packets -= packets;
1091                if (!remaining_packets)
1092                        break;
1093        }
1094        if (remaining_packets) {
1095                dev_err(&ua->dev->dev, "too many packets\n");
1096                return -ENXIO;
1097        }
1098        return 0;
1099}
1100
1101static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1102{
1103        unsigned int i;
1104
1105        for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1106                usb_free_coherent(ua->dev,
1107                                  stream->buffers[i].size,
1108                                  stream->buffers[i].addr,
1109                                  stream->buffers[i].dma);
1110}
1111
1112static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1113                             void (*urb_complete)(struct urb *))
1114{
1115        unsigned max_packet_size = stream->max_packet_bytes;
1116        struct ua101_urb *urb;
1117        unsigned int b, u = 0;
1118
1119        for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1120                unsigned int size = stream->buffers[b].size;
1121                u8 *addr = stream->buffers[b].addr;
1122                dma_addr_t dma = stream->buffers[b].dma;
1123
1124                while (size >= max_packet_size) {
1125                        if (u >= stream->queue_length)
1126                                goto bufsize_error;
1127                        urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1128                        if (!urb)
1129                                return -ENOMEM;
1130                        usb_init_urb(&urb->urb);
1131                        urb->urb.dev = ua->dev;
1132                        urb->urb.pipe = stream->usb_pipe;
1133                        urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1134                        urb->urb.transfer_buffer = addr;
1135                        urb->urb.transfer_dma = dma;
1136                        urb->urb.transfer_buffer_length = max_packet_size;
1137                        urb->urb.number_of_packets = 1;
1138                        urb->urb.interval = 1;
1139                        urb->urb.context = ua;
1140                        urb->urb.complete = urb_complete;
1141                        urb->urb.iso_frame_desc[0].offset = 0;
1142                        urb->urb.iso_frame_desc[0].length = max_packet_size;
1143                        stream->urbs[u++] = urb;
1144                        size -= max_packet_size;
1145                        addr += max_packet_size;
1146                        dma += max_packet_size;
1147                }
1148        }
1149        if (u == stream->queue_length)
1150                return 0;
1151bufsize_error:
1152        dev_err(&ua->dev->dev, "internal buffer size error\n");
1153        return -ENXIO;
1154}
1155
1156static void free_stream_urbs(struct ua101_stream *stream)
1157{
1158        unsigned int i;
1159
1160        for (i = 0; i < stream->queue_length; ++i) {
1161                kfree(stream->urbs[i]);
1162                stream->urbs[i] = NULL;
1163        }
1164}
1165
1166static void free_usb_related_resources(struct ua101 *ua,
1167                                       struct usb_interface *interface)
1168{
1169        unsigned int i;
1170        struct usb_interface *intf;
1171
1172        mutex_lock(&ua->mutex);
1173        free_stream_urbs(&ua->capture);
1174        free_stream_urbs(&ua->playback);
1175        mutex_unlock(&ua->mutex);
1176        free_stream_buffers(ua, &ua->capture);
1177        free_stream_buffers(ua, &ua->playback);
1178
1179        for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1180                mutex_lock(&ua->mutex);
1181                intf = ua->intf[i];
1182                ua->intf[i] = NULL;
1183                mutex_unlock(&ua->mutex);
1184                if (intf) {
1185                        usb_set_intfdata(intf, NULL);
1186                        if (intf != interface)
1187                                usb_driver_release_interface(&ua101_driver,
1188                                                             intf);
1189                }
1190        }
1191}
1192
1193static void ua101_card_free(struct snd_card *card)
1194{
1195        struct ua101 *ua = card->private_data;
1196
1197        mutex_destroy(&ua->mutex);
1198}
1199
1200static int ua101_probe(struct usb_interface *interface,
1201                       const struct usb_device_id *usb_id)
1202{
1203        static const struct snd_usb_midi_endpoint_info midi_ep = {
1204                .out_cables = 0x0001,
1205                .in_cables = 0x0001
1206        };
1207        static const struct snd_usb_audio_quirk midi_quirk = {
1208                .type = QUIRK_MIDI_FIXED_ENDPOINT,
1209                .data = &midi_ep
1210        };
1211        static const int intf_numbers[2][3] = {
1212                {       /* UA-101 */
1213                        [INTF_PLAYBACK] = 0,
1214                        [INTF_CAPTURE] = 1,
1215                        [INTF_MIDI] = 2,
1216                },
1217                {       /* UA-1000 */
1218                        [INTF_CAPTURE] = 1,
1219                        [INTF_PLAYBACK] = 2,
1220                        [INTF_MIDI] = 3,
1221                },
1222        };
1223        struct snd_card *card;
1224        struct ua101 *ua;
1225        unsigned int card_index, i;
1226        int is_ua1000;
1227        const char *name;
1228        char usb_path[32];
1229        int err;
1230
1231        is_ua1000 = usb_id->idProduct == 0x0044;
1232
1233        if (interface->altsetting->desc.bInterfaceNumber !=
1234            intf_numbers[is_ua1000][0])
1235                return -ENODEV;
1236
1237        mutex_lock(&devices_mutex);
1238
1239        for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1240                if (enable[card_index] && !(devices_used & (1 << card_index)))
1241                        break;
1242        if (card_index >= SNDRV_CARDS) {
1243                mutex_unlock(&devices_mutex);
1244                return -ENOENT;
1245        }
1246        err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1247                              sizeof(*ua), &card);
1248        if (err < 0) {
1249                mutex_unlock(&devices_mutex);
1250                return err;
1251        }
1252        card->private_free = ua101_card_free;
1253        ua = card->private_data;
1254        ua->dev = interface_to_usbdev(interface);
1255        ua->card = card;
1256        ua->card_index = card_index;
1257        INIT_LIST_HEAD(&ua->midi_list);
1258        spin_lock_init(&ua->lock);
1259        mutex_init(&ua->mutex);
1260        INIT_LIST_HEAD(&ua->ready_playback_urbs);
1261        tasklet_init(&ua->playback_tasklet,
1262                     playback_tasklet, (unsigned long)ua);
1263        init_waitqueue_head(&ua->alsa_capture_wait);
1264        init_waitqueue_head(&ua->rate_feedback_wait);
1265        init_waitqueue_head(&ua->alsa_playback_wait);
1266
1267        ua->intf[0] = interface;
1268        for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1269                ua->intf[i] = usb_ifnum_to_if(ua->dev,
1270                                              intf_numbers[is_ua1000][i]);
1271                if (!ua->intf[i]) {
1272                        dev_err(&ua->dev->dev, "interface %u not found\n",
1273                                intf_numbers[is_ua1000][i]);
1274                        err = -ENXIO;
1275                        goto probe_error;
1276                }
1277                err = usb_driver_claim_interface(&ua101_driver,
1278                                                 ua->intf[i], ua);
1279                if (err < 0) {
1280                        ua->intf[i] = NULL;
1281                        err = -EBUSY;
1282                        goto probe_error;
1283                }
1284        }
1285
1286        snd_card_set_dev(card, &interface->dev);
1287
1288        err = detect_usb_format(ua);
1289        if (err < 0)
1290                goto probe_error;
1291
1292        name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1293        strcpy(card->driver, "UA-101");
1294        strcpy(card->shortname, name);
1295        usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1296        snprintf(ua->card->longname, sizeof(ua->card->longname),
1297                 "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1298                 ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1299                 ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1300
1301        err = alloc_stream_buffers(ua, &ua->capture);
1302        if (err < 0)
1303                goto probe_error;
1304        err = alloc_stream_buffers(ua, &ua->playback);
1305        if (err < 0)
1306                goto probe_error;
1307
1308        err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1309        if (err < 0)
1310                goto probe_error;
1311        err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1312        if (err < 0)
1313                goto probe_error;
1314
1315        err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1316        if (err < 0)
1317                goto probe_error;
1318        ua->pcm->private_data = ua;
1319        strcpy(ua->pcm->name, name);
1320        snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1321        snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1322
1323        err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1324                                 &ua->midi_list, &midi_quirk);
1325        if (err < 0)
1326                goto probe_error;
1327
1328        err = snd_card_register(card);
1329        if (err < 0)
1330                goto probe_error;
1331
1332        usb_set_intfdata(interface, ua);
1333        devices_used |= 1 << card_index;
1334
1335        mutex_unlock(&devices_mutex);
1336        return 0;
1337
1338probe_error:
1339        free_usb_related_resources(ua, interface);
1340        snd_card_free(card);
1341        mutex_unlock(&devices_mutex);
1342        return err;
1343}
1344
1345static void ua101_disconnect(struct usb_interface *interface)
1346{
1347        struct ua101 *ua = usb_get_intfdata(interface);
1348        struct list_head *midi;
1349
1350        if (!ua)
1351                return;
1352
1353        mutex_lock(&devices_mutex);
1354
1355        set_bit(DISCONNECTED, &ua->states);
1356        wake_up(&ua->rate_feedback_wait);
1357
1358        /* make sure that userspace cannot create new requests */
1359        snd_card_disconnect(ua->card);
1360
1361        /* make sure that there are no pending USB requests */
1362        list_for_each(midi, &ua->midi_list)
1363                snd_usbmidi_disconnect(midi);
1364        abort_alsa_playback(ua);
1365        abort_alsa_capture(ua);
1366        mutex_lock(&ua->mutex);
1367        stop_usb_playback(ua);
1368        stop_usb_capture(ua);
1369        mutex_unlock(&ua->mutex);
1370
1371        free_usb_related_resources(ua, interface);
1372
1373        devices_used &= ~(1 << ua->card_index);
1374
1375        snd_card_free_when_closed(ua->card);
1376
1377        mutex_unlock(&devices_mutex);
1378}
1379
1380static struct usb_device_id ua101_ids[] = {
1381        { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1382        { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1383        { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1384        { }
1385};
1386MODULE_DEVICE_TABLE(usb, ua101_ids);
1387
1388static struct usb_driver ua101_driver = {
1389        .name = "snd-ua101",
1390        .id_table = ua101_ids,
1391        .probe = ua101_probe,
1392        .disconnect = ua101_disconnect,
1393#if 0
1394        .suspend = ua101_suspend,
1395        .resume = ua101_resume,
1396#endif
1397};
1398
1399module_usb_driver(ua101_driver);
1400