sound/usb/misc/ua101.c

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This source file includes following definitions.
usb_error_string
abort_usb_capture
abort_usb_playback
playback_urb_complete
first_playback_urb_complete
copy_playback_data
add_with_wraparound
playback_tasklet
copy_capture_data
capture_urb_complete
first_capture_urb_complete
submit_stream_urbs
kill_stream_urbs
enable_iso_interface
disable_iso_interface
stop_usb_capture
start_usb_capture
stop_usb_playback
start_usb_playback
abort_alsa_capture
abort_alsa_playback
set_stream_hw
capture_pcm_open
playback_pcm_open
capture_pcm_close
playback_pcm_close
capture_pcm_hw_params
playback_pcm_hw_params
ua101_pcm_hw_free
capture_pcm_prepare
playback_pcm_prepare
capture_pcm_trigger
playback_pcm_trigger
ua101_pcm_pointer
capture_pcm_pointer
playback_pcm_pointer
find_format_descriptor
detect_usb_format
alloc_stream_buffers
free_stream_buffers
alloc_stream_urbs
free_stream_urbs
free_usb_related_resources
ua101_card_free
ua101_probe
ua101_disconnect
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Edirol UA-101/UA-1000 driver
   4  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5  */
   6 
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/slab.h>
  10 #include <linux/usb.h>
  11 #include <linux/usb/audio.h>
  12 #include <sound/core.h>
  13 #include <sound/initval.h>
  14 #include <sound/pcm.h>
  15 #include <sound/pcm_params.h>
  16 #include "../usbaudio.h"
  17 #include "../midi.h"
  18 
  19 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
  20 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
  21 MODULE_LICENSE("GPL v2");
  22 MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
  23 
  24 /*
  25  * Should not be lower than the minimum scheduling delay of the host
  26  * controller.  Some Intel controllers need more than one frame; as long as
  27  * that driver doesn't tell us about this, use 1.5 frames just to be sure.
  28  */
  29 #define MIN_QUEUE_LENGTH        12
  30 /* Somewhat random. */
  31 #define MAX_QUEUE_LENGTH        30
  32 /*
  33  * This magic value optimizes memory usage efficiency for the UA-101's packet
  34  * sizes at all sample rates, taking into account the stupid cache pool sizes
  35  * that usb_alloc_coherent() uses.
  36  */
  37 #define DEFAULT_QUEUE_LENGTH    21
  38 
  39 #define MAX_PACKET_SIZE         672 /* hardware specific */
  40 #define MAX_MEMORY_BUFFERS      DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
  41                                              PAGE_SIZE / MAX_PACKET_SIZE)
  42 
  43 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  44 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  45 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  46 static unsigned int queue_length = 21;
  47 
  48 module_param_array(index, int, NULL, 0444);
  49 MODULE_PARM_DESC(index, "card index");
  50 module_param_array(id, charp, NULL, 0444);
  51 MODULE_PARM_DESC(id, "ID string");
  52 module_param_array(enable, bool, NULL, 0444);
  53 MODULE_PARM_DESC(enable, "enable card");
  54 module_param(queue_length, uint, 0644);
  55 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
  56                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
  57 
  58 enum {
  59         INTF_PLAYBACK,
  60         INTF_CAPTURE,
  61         INTF_MIDI,
  62 
  63         INTF_COUNT
  64 };
  65 
  66 /* bits in struct ua101::states */
  67 enum {
  68         USB_CAPTURE_RUNNING,
  69         USB_PLAYBACK_RUNNING,
  70         ALSA_CAPTURE_OPEN,
  71         ALSA_PLAYBACK_OPEN,
  72         ALSA_CAPTURE_RUNNING,
  73         ALSA_PLAYBACK_RUNNING,
  74         CAPTURE_URB_COMPLETED,
  75         PLAYBACK_URB_COMPLETED,
  76         DISCONNECTED,
  77 };
  78 
  79 struct ua101 {
  80         struct usb_device *dev;
  81         struct snd_card *card;
  82         struct usb_interface *intf[INTF_COUNT];
  83         int card_index;
  84         struct snd_pcm *pcm;
  85         struct list_head midi_list;
  86         u64 format_bit;
  87         unsigned int rate;
  88         unsigned int packets_per_second;
  89         spinlock_t lock;
  90         struct mutex mutex;
  91         unsigned long states;
  92 
  93         /* FIFO to synchronize playback rate to capture rate */
  94         unsigned int rate_feedback_start;
  95         unsigned int rate_feedback_count;
  96         u8 rate_feedback[MAX_QUEUE_LENGTH];
  97 
  98         struct list_head ready_playback_urbs;
  99         struct tasklet_struct playback_tasklet;
 100         wait_queue_head_t alsa_capture_wait;
 101         wait_queue_head_t rate_feedback_wait;
 102         wait_queue_head_t alsa_playback_wait;
 103         struct ua101_stream {
 104                 struct snd_pcm_substream *substream;
 105                 unsigned int usb_pipe;
 106                 unsigned int channels;
 107                 unsigned int frame_bytes;
 108                 unsigned int max_packet_bytes;
 109                 unsigned int period_pos;
 110                 unsigned int buffer_pos;
 111                 unsigned int queue_length;
 112                 struct ua101_urb {
 113                         struct urb urb;
 114                         struct usb_iso_packet_descriptor iso_frame_desc[1];
 115                         struct list_head ready_list;
 116                 } *urbs[MAX_QUEUE_LENGTH];
 117                 struct {
 118                         unsigned int size;
 119                         void *addr;
 120                         dma_addr_t dma;
 121                 } buffers[MAX_MEMORY_BUFFERS];
 122         } capture, playback;
 123 };
 124 
 125 static DEFINE_MUTEX(devices_mutex);
 126 static unsigned int devices_used;
 127 static struct usb_driver ua101_driver;
 128 
 129 static void abort_alsa_playback(struct ua101 *ua);
 130 static void abort_alsa_capture(struct ua101 *ua);
 131 
 132 static const char *usb_error_string(int err)
 133 {
 134         switch (err) {
 135         case -ENODEV:
 136                 return "no device";
 137         case -ENOENT:
 138                 return "endpoint not enabled";
 139         case -EPIPE:
 140                 return "endpoint stalled";
 141         case -ENOSPC:
 142                 return "not enough bandwidth";
 143         case -ESHUTDOWN:
 144                 return "device disabled";
 145         case -EHOSTUNREACH:
 146                 return "device suspended";
 147         case -EINVAL:
 148         case -EAGAIN:
 149         case -EFBIG:
 150         case -EMSGSIZE:
 151                 return "internal error";
 152         default:
 153                 return "unknown error";
 154         }
 155 }
 156 
 157 static void abort_usb_capture(struct ua101 *ua)
 158 {
 159         if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 160                 wake_up(&ua->alsa_capture_wait);
 161                 wake_up(&ua->rate_feedback_wait);
 162         }
 163 }
 164 
 165 static void abort_usb_playback(struct ua101 *ua)
 166 {
 167         if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
 168                 wake_up(&ua->alsa_playback_wait);
 169 }
 170 
 171 static void playback_urb_complete(struct urb *usb_urb)
 172 {
 173         struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
 174         struct ua101 *ua = urb->urb.context;
 175         unsigned long flags;
 176 
 177         if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
 178                      urb->urb.status == -ENODEV ||      /* device removed */
 179                      urb->urb.status == -ECONNRESET ||  /* unlinked */
 180                      urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
 181                 abort_usb_playback(ua);
 182                 abort_alsa_playback(ua);
 183                 return;
 184         }
 185 
 186         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
 187                 /* append URB to FIFO */
 188                 spin_lock_irqsave(&ua->lock, flags);
 189                 list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
 190                 if (ua->rate_feedback_count > 0)
 191                         tasklet_schedule(&ua->playback_tasklet);
 192                 ua->playback.substream->runtime->delay -=
 193                                 urb->urb.iso_frame_desc[0].length /
 194                                                 ua->playback.frame_bytes;
 195                 spin_unlock_irqrestore(&ua->lock, flags);
 196         }
 197 }
 198 
 199 static void first_playback_urb_complete(struct urb *urb)
 200 {
 201         struct ua101 *ua = urb->context;
 202 
 203         urb->complete = playback_urb_complete;
 204         playback_urb_complete(urb);
 205 
 206         set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 207         wake_up(&ua->alsa_playback_wait);
 208 }
 209 
 210 /* copy data from the ALSA ring buffer into the URB buffer */
 211 static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
 212                                unsigned int frames)
 213 {
 214         struct snd_pcm_runtime *runtime;
 215         unsigned int frame_bytes, frames1;
 216         const u8 *source;
 217 
 218         runtime = stream->substream->runtime;
 219         frame_bytes = stream->frame_bytes;
 220         source = runtime->dma_area + stream->buffer_pos * frame_bytes;
 221         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 222                 memcpy(urb->transfer_buffer, source, frames * frame_bytes);
 223         } else {
 224                 /* wrap around at end of ring buffer */
 225                 frames1 = runtime->buffer_size - stream->buffer_pos;
 226                 memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
 227                 memcpy(urb->transfer_buffer + frames1 * frame_bytes,
 228                        runtime->dma_area, (frames - frames1) * frame_bytes);
 229         }
 230 
 231         stream->buffer_pos += frames;
 232         if (stream->buffer_pos >= runtime->buffer_size)
 233                 stream->buffer_pos -= runtime->buffer_size;
 234         stream->period_pos += frames;
 235         if (stream->period_pos >= runtime->period_size) {
 236                 stream->period_pos -= runtime->period_size;
 237                 return true;
 238         }
 239         return false;
 240 }
 241 
 242 static inline void add_with_wraparound(struct ua101 *ua,
 243                                        unsigned int *value, unsigned int add)
 244 {
 245         *value += add;
 246         if (*value >= ua->playback.queue_length)
 247                 *value -= ua->playback.queue_length;
 248 }
 249 
 250 static void playback_tasklet(unsigned long data)
 251 {
 252         struct ua101 *ua = (void *)data;
 253         unsigned long flags;
 254         unsigned int frames;
 255         struct ua101_urb *urb;
 256         bool do_period_elapsed = false;
 257         int err;
 258 
 259         if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
 260                 return;
 261 
 262         /*
 263          * Synchronizing the playback rate to the capture rate is done by using
 264          * the same sequence of packet sizes for both streams.
 265          * Submitting a playback URB therefore requires both a ready URB and
 266          * the size of the corresponding capture packet, i.e., both playback
 267          * and capture URBs must have been completed.  Since the USB core does
 268          * not guarantee that playback and capture complete callbacks are
 269          * called alternately, we use two FIFOs for packet sizes and read URBs;
 270          * submitting playback URBs is possible as long as both FIFOs are
 271          * nonempty.
 272          */
 273         spin_lock_irqsave(&ua->lock, flags);
 274         while (ua->rate_feedback_count > 0 &&
 275                !list_empty(&ua->ready_playback_urbs)) {
 276                 /* take packet size out of FIFO */
 277                 frames = ua->rate_feedback[ua->rate_feedback_start];
 278                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 279                 ua->rate_feedback_count--;
 280 
 281                 /* take URB out of FIFO */
 282                 urb = list_first_entry(&ua->ready_playback_urbs,
 283                                        struct ua101_urb, ready_list);
 284                 list_del(&urb->ready_list);
 285 
 286                 /* fill packet with data or silence */
 287                 urb->urb.iso_frame_desc[0].length =
 288                         frames * ua->playback.frame_bytes;
 289                 if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 290                         do_period_elapsed |= copy_playback_data(&ua->playback,
 291                                                                 &urb->urb,
 292                                                                 frames);
 293                 else
 294                         memset(urb->urb.transfer_buffer, 0,
 295                                urb->urb.iso_frame_desc[0].length);
 296 
 297                 /* and off you go ... */
 298                 err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
 299                 if (unlikely(err < 0)) {
 300                         spin_unlock_irqrestore(&ua->lock, flags);
 301                         abort_usb_playback(ua);
 302                         abort_alsa_playback(ua);
 303                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 304                                 err, usb_error_string(err));
 305                         return;
 306                 }
 307                 ua->playback.substream->runtime->delay += frames;
 308         }
 309         spin_unlock_irqrestore(&ua->lock, flags);
 310         if (do_period_elapsed)
 311                 snd_pcm_period_elapsed(ua->playback.substream);
 312 }
 313 
 314 /* copy data from the URB buffer into the ALSA ring buffer */
 315 static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
 316                               unsigned int frames)
 317 {
 318         struct snd_pcm_runtime *runtime;
 319         unsigned int frame_bytes, frames1;
 320         u8 *dest;
 321 
 322         runtime = stream->substream->runtime;
 323         frame_bytes = stream->frame_bytes;
 324         dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
 325         if (stream->buffer_pos + frames <= runtime->buffer_size) {
 326                 memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
 327         } else {
 328                 /* wrap around at end of ring buffer */
 329                 frames1 = runtime->buffer_size - stream->buffer_pos;
 330                 memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
 331                 memcpy(runtime->dma_area,
 332                        urb->transfer_buffer + frames1 * frame_bytes,
 333                        (frames - frames1) * frame_bytes);
 334         }
 335 
 336         stream->buffer_pos += frames;
 337         if (stream->buffer_pos >= runtime->buffer_size)
 338                 stream->buffer_pos -= runtime->buffer_size;
 339         stream->period_pos += frames;
 340         if (stream->period_pos >= runtime->period_size) {
 341                 stream->period_pos -= runtime->period_size;
 342                 return true;
 343         }
 344         return false;
 345 }
 346 
 347 static void capture_urb_complete(struct urb *urb)
 348 {
 349         struct ua101 *ua = urb->context;
 350         struct ua101_stream *stream = &ua->capture;
 351         unsigned long flags;
 352         unsigned int frames, write_ptr;
 353         bool do_period_elapsed;
 354         int err;
 355 
 356         if (unlikely(urb->status == -ENOENT ||          /* unlinked */
 357                      urb->status == -ENODEV ||          /* device removed */
 358                      urb->status == -ECONNRESET ||      /* unlinked */
 359                      urb->status == -ESHUTDOWN))        /* device disabled */
 360                 goto stream_stopped;
 361 
 362         if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
 363                 frames = urb->iso_frame_desc[0].actual_length /
 364                         stream->frame_bytes;
 365         else
 366                 frames = 0;
 367 
 368         spin_lock_irqsave(&ua->lock, flags);
 369 
 370         if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 371                 do_period_elapsed = copy_capture_data(stream, urb, frames);
 372         else
 373                 do_period_elapsed = false;
 374 
 375         if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 376                 err = usb_submit_urb(urb, GFP_ATOMIC);
 377                 if (unlikely(err < 0)) {
 378                         spin_unlock_irqrestore(&ua->lock, flags);
 379                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 380                                 err, usb_error_string(err));
 381                         goto stream_stopped;
 382                 }
 383 
 384                 /* append packet size to FIFO */
 385                 write_ptr = ua->rate_feedback_start;
 386                 add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
 387                 ua->rate_feedback[write_ptr] = frames;
 388                 if (ua->rate_feedback_count < ua->playback.queue_length) {
 389                         ua->rate_feedback_count++;
 390                         if (ua->rate_feedback_count ==
 391                                                 ua->playback.queue_length)
 392                                 wake_up(&ua->rate_feedback_wait);
 393                 } else {
 394                         /*
 395                          * Ring buffer overflow; this happens when the playback
 396                          * stream is not running.  Throw away the oldest entry,
 397                          * so that the playback stream, when it starts, sees
 398                          * the most recent packet sizes.
 399                          */
 400                         add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 401                 }
 402                 if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
 403                     !list_empty(&ua->ready_playback_urbs))
 404                         tasklet_schedule(&ua->playback_tasklet);
 405         }
 406 
 407         spin_unlock_irqrestore(&ua->lock, flags);
 408 
 409         if (do_period_elapsed)
 410                 snd_pcm_period_elapsed(stream->substream);
 411 
 412         return;
 413 
 414 stream_stopped:
 415         abort_usb_playback(ua);
 416         abort_usb_capture(ua);
 417         abort_alsa_playback(ua);
 418         abort_alsa_capture(ua);
 419 }
 420 
 421 static void first_capture_urb_complete(struct urb *urb)
 422 {
 423         struct ua101 *ua = urb->context;
 424 
 425         urb->complete = capture_urb_complete;
 426         capture_urb_complete(urb);
 427 
 428         set_bit(CAPTURE_URB_COMPLETED, &ua->states);
 429         wake_up(&ua->alsa_capture_wait);
 430 }
 431 
 432 static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
 433 {
 434         unsigned int i;
 435 
 436         for (i = 0; i < stream->queue_length; ++i) {
 437                 int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
 438                 if (err < 0) {
 439                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
 440                                 err, usb_error_string(err));
 441                         return err;
 442                 }
 443         }
 444         return 0;
 445 }
 446 
 447 static void kill_stream_urbs(struct ua101_stream *stream)
 448 {
 449         unsigned int i;
 450 
 451         for (i = 0; i < stream->queue_length; ++i)
 452                 if (stream->urbs[i])
 453                         usb_kill_urb(&stream->urbs[i]->urb);
 454 }
 455 
 456 static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 457 {
 458         struct usb_host_interface *alts;
 459 
 460         alts = ua->intf[intf_index]->cur_altsetting;
 461         if (alts->desc.bAlternateSetting != 1) {
 462                 int err = usb_set_interface(ua->dev,
 463                                             alts->desc.bInterfaceNumber, 1);
 464                 if (err < 0) {
 465                         dev_err(&ua->dev->dev,
 466                                 "cannot initialize interface; error %d: %s\n",
 467                                 err, usb_error_string(err));
 468                         return err;
 469                 }
 470         }
 471         return 0;
 472 }
 473 
 474 static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
 475 {
 476         struct usb_host_interface *alts;
 477 
 478         if (!ua->intf[intf_index])
 479                 return;
 480 
 481         alts = ua->intf[intf_index]->cur_altsetting;
 482         if (alts->desc.bAlternateSetting != 0) {
 483                 int err = usb_set_interface(ua->dev,
 484                                             alts->desc.bInterfaceNumber, 0);
 485                 if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
 486                         dev_warn(&ua->dev->dev,
 487                                  "interface reset failed; error %d: %s\n",
 488                                  err, usb_error_string(err));
 489         }
 490 }
 491 
 492 static void stop_usb_capture(struct ua101 *ua)
 493 {
 494         clear_bit(USB_CAPTURE_RUNNING, &ua->states);
 495 
 496         kill_stream_urbs(&ua->capture);
 497 
 498         disable_iso_interface(ua, INTF_CAPTURE);
 499 }
 500 
 501 static int start_usb_capture(struct ua101 *ua)
 502 {
 503         int err;
 504 
 505         if (test_bit(DISCONNECTED, &ua->states))
 506                 return -ENODEV;
 507 
 508         if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
 509                 return 0;
 510 
 511         kill_stream_urbs(&ua->capture);
 512 
 513         err = enable_iso_interface(ua, INTF_CAPTURE);
 514         if (err < 0)
 515                 return err;
 516 
 517         clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
 518         ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
 519         ua->rate_feedback_start = 0;
 520         ua->rate_feedback_count = 0;
 521 
 522         set_bit(USB_CAPTURE_RUNNING, &ua->states);
 523         err = submit_stream_urbs(ua, &ua->capture);
 524         if (err < 0)
 525                 stop_usb_capture(ua);
 526         return err;
 527 }
 528 
 529 static void stop_usb_playback(struct ua101 *ua)
 530 {
 531         clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
 532 
 533         kill_stream_urbs(&ua->playback);
 534 
 535         tasklet_kill(&ua->playback_tasklet);
 536 
 537         disable_iso_interface(ua, INTF_PLAYBACK);
 538 }
 539 
 540 static int start_usb_playback(struct ua101 *ua)
 541 {
 542         unsigned int i, frames;
 543         struct urb *urb;
 544         int err = 0;
 545 
 546         if (test_bit(DISCONNECTED, &ua->states))
 547                 return -ENODEV;
 548 
 549         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 550                 return 0;
 551 
 552         kill_stream_urbs(&ua->playback);
 553         tasklet_kill(&ua->playback_tasklet);
 554 
 555         err = enable_iso_interface(ua, INTF_PLAYBACK);
 556         if (err < 0)
 557                 return err;
 558 
 559         clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
 560         ua->playback.urbs[0]->urb.complete =
 561                 first_playback_urb_complete;
 562         spin_lock_irq(&ua->lock);
 563         INIT_LIST_HEAD(&ua->ready_playback_urbs);
 564         spin_unlock_irq(&ua->lock);
 565 
 566         /*
 567          * We submit the initial URBs all at once, so we have to wait for the
 568          * packet size FIFO to be full.
 569          */
 570         wait_event(ua->rate_feedback_wait,
 571                    ua->rate_feedback_count >= ua->playback.queue_length ||
 572                    !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
 573                    test_bit(DISCONNECTED, &ua->states));
 574         if (test_bit(DISCONNECTED, &ua->states)) {
 575                 stop_usb_playback(ua);
 576                 return -ENODEV;
 577         }
 578         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
 579                 stop_usb_playback(ua);
 580                 return -EIO;
 581         }
 582 
 583         for (i = 0; i < ua->playback.queue_length; ++i) {
 584                 /* all initial URBs contain silence */
 585                 spin_lock_irq(&ua->lock);
 586                 frames = ua->rate_feedback[ua->rate_feedback_start];
 587                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
 588                 ua->rate_feedback_count--;
 589                 spin_unlock_irq(&ua->lock);
 590                 urb = &ua->playback.urbs[i]->urb;
 591                 urb->iso_frame_desc[0].length =
 592                         frames * ua->playback.frame_bytes;
 593                 memset(urb->transfer_buffer, 0,
 594                        urb->iso_frame_desc[0].length);
 595         }
 596 
 597         set_bit(USB_PLAYBACK_RUNNING, &ua->states);
 598         err = submit_stream_urbs(ua, &ua->playback);
 599         if (err < 0)
 600                 stop_usb_playback(ua);
 601         return err;
 602 }
 603 
 604 static void abort_alsa_capture(struct ua101 *ua)
 605 {
 606         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
 607                 snd_pcm_stop_xrun(ua->capture.substream);
 608 }
 609 
 610 static void abort_alsa_playback(struct ua101 *ua)
 611 {
 612         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
 613                 snd_pcm_stop_xrun(ua->playback.substream);
 614 }
 615 
 616 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
 617                          unsigned int channels)
 618 {
 619         int err;
 620 
 621         substream->runtime->hw.info =
 622                 SNDRV_PCM_INFO_MMAP |
 623                 SNDRV_PCM_INFO_MMAP_VALID |
 624                 SNDRV_PCM_INFO_BATCH |
 625                 SNDRV_PCM_INFO_INTERLEAVED |
 626                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 627                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 628         substream->runtime->hw.formats = ua->format_bit;
 629         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
 630         substream->runtime->hw.rate_min = ua->rate;
 631         substream->runtime->hw.rate_max = ua->rate;
 632         substream->runtime->hw.channels_min = channels;
 633         substream->runtime->hw.channels_max = channels;
 634         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
 635         substream->runtime->hw.period_bytes_min = 1;
 636         substream->runtime->hw.period_bytes_max = UINT_MAX;
 637         substream->runtime->hw.periods_min = 2;
 638         substream->runtime->hw.periods_max = UINT_MAX;
 639         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 640                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 641                                            1500000 / ua->packets_per_second,
 642                                            UINT_MAX);
 643         if (err < 0)
 644                 return err;
 645         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
 646         return err;
 647 }
 648 
 649 static int capture_pcm_open(struct snd_pcm_substream *substream)
 650 {
 651         struct ua101 *ua = substream->private_data;
 652         int err;
 653 
 654         ua->capture.substream = substream;
 655         err = set_stream_hw(ua, substream, ua->capture.channels);
 656         if (err < 0)
 657                 return err;
 658         substream->runtime->hw.fifo_size =
 659                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
 660         substream->runtime->delay = substream->runtime->hw.fifo_size;
 661 
 662         mutex_lock(&ua->mutex);
 663         err = start_usb_capture(ua);
 664         if (err >= 0)
 665                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
 666         mutex_unlock(&ua->mutex);
 667         return err;
 668 }
 669 
 670 static int playback_pcm_open(struct snd_pcm_substream *substream)
 671 {
 672         struct ua101 *ua = substream->private_data;
 673         int err;
 674 
 675         ua->playback.substream = substream;
 676         err = set_stream_hw(ua, substream, ua->playback.channels);
 677         if (err < 0)
 678                 return err;
 679         substream->runtime->hw.fifo_size =
 680                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
 681                                   ua->packets_per_second);
 682 
 683         mutex_lock(&ua->mutex);
 684         err = start_usb_capture(ua);
 685         if (err < 0)
 686                 goto error;
 687         err = start_usb_playback(ua);
 688         if (err < 0) {
 689                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 690                         stop_usb_capture(ua);
 691                 goto error;
 692         }
 693         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 694 error:
 695         mutex_unlock(&ua->mutex);
 696         return err;
 697 }
 698 
 699 static int capture_pcm_close(struct snd_pcm_substream *substream)
 700 {
 701         struct ua101 *ua = substream->private_data;
 702 
 703         mutex_lock(&ua->mutex);
 704         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
 705         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
 706                 stop_usb_capture(ua);
 707         mutex_unlock(&ua->mutex);
 708         return 0;
 709 }
 710 
 711 static int playback_pcm_close(struct snd_pcm_substream *substream)
 712 {
 713         struct ua101 *ua = substream->private_data;
 714 
 715         mutex_lock(&ua->mutex);
 716         stop_usb_playback(ua);
 717         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
 718         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
 719                 stop_usb_capture(ua);
 720         mutex_unlock(&ua->mutex);
 721         return 0;
 722 }
 723 
 724 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
 725                                  struct snd_pcm_hw_params *hw_params)
 726 {
 727         struct ua101 *ua = substream->private_data;
 728         int err;
 729 
 730         mutex_lock(&ua->mutex);
 731         err = start_usb_capture(ua);
 732         mutex_unlock(&ua->mutex);
 733         if (err < 0)
 734                 return err;
 735 
 736         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 737                                                 params_buffer_bytes(hw_params));
 738 }
 739 
 740 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
 741                                   struct snd_pcm_hw_params *hw_params)
 742 {
 743         struct ua101 *ua = substream->private_data;
 744         int err;
 745 
 746         mutex_lock(&ua->mutex);
 747         err = start_usb_capture(ua);
 748         if (err >= 0)
 749                 err = start_usb_playback(ua);
 750         mutex_unlock(&ua->mutex);
 751         if (err < 0)
 752                 return err;
 753 
 754         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 755                                                 params_buffer_bytes(hw_params));
 756 }
 757 
 758 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
 759 {
 760         return snd_pcm_lib_free_vmalloc_buffer(substream);
 761 }
 762 
 763 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
 764 {
 765         struct ua101 *ua = substream->private_data;
 766         int err;
 767 
 768         mutex_lock(&ua->mutex);
 769         err = start_usb_capture(ua);
 770         mutex_unlock(&ua->mutex);
 771         if (err < 0)
 772                 return err;
 773 
 774         /*
 775          * The EHCI driver schedules the first packet of an iso stream at 10 ms
 776          * in the future, i.e., no data is actually captured for that long.
 777          * Take the wait here so that the stream is known to be actually
 778          * running when the start trigger has been called.
 779          */
 780         wait_event(ua->alsa_capture_wait,
 781                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
 782                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
 783         if (test_bit(DISCONNECTED, &ua->states))
 784                 return -ENODEV;
 785         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 786                 return -EIO;
 787 
 788         ua->capture.period_pos = 0;
 789         ua->capture.buffer_pos = 0;
 790         return 0;
 791 }
 792 
 793 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
 794 {
 795         struct ua101 *ua = substream->private_data;
 796         int err;
 797 
 798         mutex_lock(&ua->mutex);
 799         err = start_usb_capture(ua);
 800         if (err >= 0)
 801                 err = start_usb_playback(ua);
 802         mutex_unlock(&ua->mutex);
 803         if (err < 0)
 804                 return err;
 805 
 806         /* see the comment in capture_pcm_prepare() */
 807         wait_event(ua->alsa_playback_wait,
 808                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
 809                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
 810         if (test_bit(DISCONNECTED, &ua->states))
 811                 return -ENODEV;
 812         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 813                 return -EIO;
 814 
 815         substream->runtime->delay = 0;
 816         ua->playback.period_pos = 0;
 817         ua->playback.buffer_pos = 0;
 818         return 0;
 819 }
 820 
 821 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 822 {
 823         struct ua101 *ua = substream->private_data;
 824 
 825         switch (cmd) {
 826         case SNDRV_PCM_TRIGGER_START:
 827                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
 828                         return -EIO;
 829                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 830                 return 0;
 831         case SNDRV_PCM_TRIGGER_STOP:
 832                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
 833                 return 0;
 834         default:
 835                 return -EINVAL;
 836         }
 837 }
 838 
 839 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 840 {
 841         struct ua101 *ua = substream->private_data;
 842 
 843         switch (cmd) {
 844         case SNDRV_PCM_TRIGGER_START:
 845                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
 846                         return -EIO;
 847                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 848                 return 0;
 849         case SNDRV_PCM_TRIGGER_STOP:
 850                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
 851                 return 0;
 852         default:
 853                 return -EINVAL;
 854         }
 855 }
 856 
 857 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
 858                                                   struct ua101_stream *stream)
 859 {
 860         unsigned long flags;
 861         unsigned int pos;
 862 
 863         spin_lock_irqsave(&ua->lock, flags);
 864         pos = stream->buffer_pos;
 865         spin_unlock_irqrestore(&ua->lock, flags);
 866         return pos;
 867 }
 868 
 869 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
 870 {
 871         struct ua101 *ua = subs->private_data;
 872 
 873         return ua101_pcm_pointer(ua, &ua->capture);
 874 }
 875 
 876 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
 877 {
 878         struct ua101 *ua = subs->private_data;
 879 
 880         return ua101_pcm_pointer(ua, &ua->playback);
 881 }
 882 
 883 static const struct snd_pcm_ops capture_pcm_ops = {
 884         .open = capture_pcm_open,
 885         .close = capture_pcm_close,
 886         .ioctl = snd_pcm_lib_ioctl,
 887         .hw_params = capture_pcm_hw_params,
 888         .hw_free = ua101_pcm_hw_free,
 889         .prepare = capture_pcm_prepare,
 890         .trigger = capture_pcm_trigger,
 891         .pointer = capture_pcm_pointer,
 892         .page = snd_pcm_lib_get_vmalloc_page,
 893 };
 894 
 895 static const struct snd_pcm_ops playback_pcm_ops = {
 896         .open = playback_pcm_open,
 897         .close = playback_pcm_close,
 898         .ioctl = snd_pcm_lib_ioctl,
 899         .hw_params = playback_pcm_hw_params,
 900         .hw_free = ua101_pcm_hw_free,
 901         .prepare = playback_pcm_prepare,
 902         .trigger = playback_pcm_trigger,
 903         .pointer = playback_pcm_pointer,
 904         .page = snd_pcm_lib_get_vmalloc_page,
 905 };
 906 
 907 static const struct uac_format_type_i_discrete_descriptor *
 908 find_format_descriptor(struct usb_interface *interface)
 909 {
 910         struct usb_host_interface *alt;
 911         u8 *extra;
 912         int extralen;
 913 
 914         if (interface->num_altsetting != 2) {
 915                 dev_err(&interface->dev, "invalid num_altsetting\n");
 916                 return NULL;
 917         }
 918 
 919         alt = &interface->altsetting[0];
 920         if (alt->desc.bNumEndpoints != 0) {
 921                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 922                 return NULL;
 923         }
 924 
 925         alt = &interface->altsetting[1];
 926         if (alt->desc.bNumEndpoints != 1) {
 927                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
 928                 return NULL;
 929         }
 930 
 931         extra = alt->extra;
 932         extralen = alt->extralen;
 933         while (extralen >= sizeof(struct usb_descriptor_header)) {
 934                 struct uac_format_type_i_discrete_descriptor *desc;
 935 
 936                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
 937                 if (desc->bLength > extralen) {
 938                         dev_err(&interface->dev, "descriptor overflow\n");
 939                         return NULL;
 940                 }
 941                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
 942                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
 943                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
 944                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
 945                             desc->bSamFreqType != 1) {
 946                                 dev_err(&interface->dev,
 947                                         "invalid format type\n");
 948                                 return NULL;
 949                         }
 950                         return desc;
 951                 }
 952                 extralen -= desc->bLength;
 953                 extra += desc->bLength;
 954         }
 955         dev_err(&interface->dev, "sample format descriptor not found\n");
 956         return NULL;
 957 }
 958 
 959 static int detect_usb_format(struct ua101 *ua)
 960 {
 961         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
 962         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
 963         const struct usb_endpoint_descriptor *epd;
 964         unsigned int rate2;
 965 
 966         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
 967         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
 968         if (!fmt_capture || !fmt_playback)
 969                 return -ENXIO;
 970 
 971         switch (fmt_capture->bSubframeSize) {
 972         case 3:
 973                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
 974                 break;
 975         case 4:
 976                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
 977                 break;
 978         default:
 979                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
 980                 return -ENXIO;
 981         }
 982         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
 983                 dev_err(&ua->dev->dev,
 984                         "playback/capture sample widths do not match\n");
 985                 return -ENXIO;
 986         }
 987 
 988         if (fmt_capture->bBitResolution != 24 ||
 989             fmt_playback->bBitResolution != 24) {
 990                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
 991                 return -ENXIO;
 992         }
 993 
 994         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
 995         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
 996         if (ua->rate != rate2) {
 997                 dev_err(&ua->dev->dev,
 998                         "playback/capture rates do not match: %u/%u\n",
 999                         rate2, ua->rate);
1000                 return -ENXIO;
1001         }
1002 
1003         switch (ua->dev->speed) {
1004         case USB_SPEED_FULL:
1005                 ua->packets_per_second = 1000;
1006                 break;
1007         case USB_SPEED_HIGH:
1008                 ua->packets_per_second = 8000;
1009                 break;
1010         default:
1011                 dev_err(&ua->dev->dev, "unknown device speed\n");
1012                 return -ENXIO;
1013         }
1014 
1015         ua->capture.channels = fmt_capture->bNrChannels;
1016         ua->playback.channels = fmt_playback->bNrChannels;
1017         ua->capture.frame_bytes =
1018                 fmt_capture->bSubframeSize * ua->capture.channels;
1019         ua->playback.frame_bytes =
1020                 fmt_playback->bSubframeSize * ua->playback.channels;
1021 
1022         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1023         if (!usb_endpoint_is_isoc_in(epd)) {
1024                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1025                 return -ENXIO;
1026         }
1027         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1028         ua->capture.max_packet_bytes = usb_endpoint_maxp(epd);
1029 
1030         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1031         if (!usb_endpoint_is_isoc_out(epd)) {
1032                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1033                 return -ENXIO;
1034         }
1035         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1036         ua->playback.max_packet_bytes = usb_endpoint_maxp(epd);
1037         return 0;
1038 }
1039 
1040 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1041 {
1042         unsigned int remaining_packets, packets, packets_per_page, i;
1043         size_t size;
1044 
1045         stream->queue_length = queue_length;
1046         stream->queue_length = max(stream->queue_length,
1047                                    (unsigned int)MIN_QUEUE_LENGTH);
1048         stream->queue_length = min(stream->queue_length,
1049                                    (unsigned int)MAX_QUEUE_LENGTH);
1050 
1051         /*
1052          * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1053          * quite bad when used with the packet sizes of this device (e.g. 280,
1054          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1055          * a smaller buffer only for the last chunk.
1056          */
1057         remaining_packets = stream->queue_length;
1058         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1059         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1060                 packets = min(remaining_packets, packets_per_page);
1061                 size = packets * stream->max_packet_bytes;
1062                 stream->buffers[i].addr =
1063                         usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1064                                            &stream->buffers[i].dma);
1065                 if (!stream->buffers[i].addr)
1066                         return -ENOMEM;
1067                 stream->buffers[i].size = size;
1068                 remaining_packets -= packets;
1069                 if (!remaining_packets)
1070                         break;
1071         }
1072         if (remaining_packets) {
1073                 dev_err(&ua->dev->dev, "too many packets\n");
1074                 return -ENXIO;
1075         }
1076         return 0;
1077 }
1078 
1079 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1080 {
1081         unsigned int i;
1082 
1083         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1084                 usb_free_coherent(ua->dev,
1085                                   stream->buffers[i].size,
1086                                   stream->buffers[i].addr,
1087                                   stream->buffers[i].dma);
1088 }
1089 
1090 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1091                              void (*urb_complete)(struct urb *))
1092 {
1093         unsigned max_packet_size = stream->max_packet_bytes;
1094         struct ua101_urb *urb;
1095         unsigned int b, u = 0;
1096 
1097         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1098                 unsigned int size = stream->buffers[b].size;
1099                 u8 *addr = stream->buffers[b].addr;
1100                 dma_addr_t dma = stream->buffers[b].dma;
1101 
1102                 while (size >= max_packet_size) {
1103                         if (u >= stream->queue_length)
1104                                 goto bufsize_error;
1105                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1106                         if (!urb)
1107                                 return -ENOMEM;
1108                         usb_init_urb(&urb->urb);
1109                         urb->urb.dev = ua->dev;
1110                         urb->urb.pipe = stream->usb_pipe;
1111                         urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1112                         urb->urb.transfer_buffer = addr;
1113                         urb->urb.transfer_dma = dma;
1114                         urb->urb.transfer_buffer_length = max_packet_size;
1115                         urb->urb.number_of_packets = 1;
1116                         urb->urb.interval = 1;
1117                         urb->urb.context = ua;
1118                         urb->urb.complete = urb_complete;
1119                         urb->urb.iso_frame_desc[0].offset = 0;
1120                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1121                         stream->urbs[u++] = urb;
1122                         size -= max_packet_size;
1123                         addr += max_packet_size;
1124                         dma += max_packet_size;
1125                 }
1126         }
1127         if (u == stream->queue_length)
1128                 return 0;
1129 bufsize_error:
1130         dev_err(&ua->dev->dev, "internal buffer size error\n");
1131         return -ENXIO;
1132 }
1133 
1134 static void free_stream_urbs(struct ua101_stream *stream)
1135 {
1136         unsigned int i;
1137 
1138         for (i = 0; i < stream->queue_length; ++i) {
1139                 kfree(stream->urbs[i]);
1140                 stream->urbs[i] = NULL;
1141         }
1142 }
1143 
1144 static void free_usb_related_resources(struct ua101 *ua,
1145                                        struct usb_interface *interface)
1146 {
1147         unsigned int i;
1148         struct usb_interface *intf;
1149 
1150         mutex_lock(&ua->mutex);
1151         free_stream_urbs(&ua->capture);
1152         free_stream_urbs(&ua->playback);
1153         mutex_unlock(&ua->mutex);
1154         free_stream_buffers(ua, &ua->capture);
1155         free_stream_buffers(ua, &ua->playback);
1156 
1157         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1158                 mutex_lock(&ua->mutex);
1159                 intf = ua->intf[i];
1160                 ua->intf[i] = NULL;
1161                 mutex_unlock(&ua->mutex);
1162                 if (intf) {
1163                         usb_set_intfdata(intf, NULL);
1164                         if (intf != interface)
1165                                 usb_driver_release_interface(&ua101_driver,
1166                                                              intf);
1167                 }
1168         }
1169 }
1170 
1171 static void ua101_card_free(struct snd_card *card)
1172 {
1173         struct ua101 *ua = card->private_data;
1174 
1175         mutex_destroy(&ua->mutex);
1176 }
1177 
1178 static int ua101_probe(struct usb_interface *interface,
1179                        const struct usb_device_id *usb_id)
1180 {
1181         static const struct snd_usb_midi_endpoint_info midi_ep = {
1182                 .out_cables = 0x0001,
1183                 .in_cables = 0x0001
1184         };
1185         static const struct snd_usb_audio_quirk midi_quirk = {
1186                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1187                 .data = &midi_ep
1188         };
1189         static const int intf_numbers[2][3] = {
1190                 {       /* UA-101 */
1191                         [INTF_PLAYBACK] = 0,
1192                         [INTF_CAPTURE] = 1,
1193                         [INTF_MIDI] = 2,
1194                 },
1195                 {       /* UA-1000 */
1196                         [INTF_CAPTURE] = 1,
1197                         [INTF_PLAYBACK] = 2,
1198                         [INTF_MIDI] = 3,
1199                 },
1200         };
1201         struct snd_card *card;
1202         struct ua101 *ua;
1203         unsigned int card_index, i;
1204         int is_ua1000;
1205         const char *name;
1206         char usb_path[32];
1207         int err;
1208 
1209         is_ua1000 = usb_id->idProduct == 0x0044;
1210 
1211         if (interface->altsetting->desc.bInterfaceNumber !=
1212             intf_numbers[is_ua1000][0])
1213                 return -ENODEV;
1214 
1215         mutex_lock(&devices_mutex);
1216 
1217         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1218                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1219                         break;
1220         if (card_index >= SNDRV_CARDS) {
1221                 mutex_unlock(&devices_mutex);
1222                 return -ENOENT;
1223         }
1224         err = snd_card_new(&interface->dev,
1225                            index[card_index], id[card_index], THIS_MODULE,
1226                            sizeof(*ua), &card);
1227         if (err < 0) {
1228                 mutex_unlock(&devices_mutex);
1229                 return err;
1230         }
1231         card->private_free = ua101_card_free;
1232         ua = card->private_data;
1233         ua->dev = interface_to_usbdev(interface);
1234         ua->card = card;
1235         ua->card_index = card_index;
1236         INIT_LIST_HEAD(&ua->midi_list);
1237         spin_lock_init(&ua->lock);
1238         mutex_init(&ua->mutex);
1239         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1240         tasklet_init(&ua->playback_tasklet,
1241                      playback_tasklet, (unsigned long)ua);
1242         init_waitqueue_head(&ua->alsa_capture_wait);
1243         init_waitqueue_head(&ua->rate_feedback_wait);
1244         init_waitqueue_head(&ua->alsa_playback_wait);
1245 
1246         ua->intf[0] = interface;
1247         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1248                 ua->intf[i] = usb_ifnum_to_if(ua->dev,
1249                                               intf_numbers[is_ua1000][i]);
1250                 if (!ua->intf[i]) {
1251                         dev_err(&ua->dev->dev, "interface %u not found\n",
1252                                 intf_numbers[is_ua1000][i]);
1253                         err = -ENXIO;
1254                         goto probe_error;
1255                 }
1256                 err = usb_driver_claim_interface(&ua101_driver,
1257                                                  ua->intf[i], ua);
1258                 if (err < 0) {
1259                         ua->intf[i] = NULL;
1260                         err = -EBUSY;
1261                         goto probe_error;
1262                 }
1263         }
1264 
1265         err = detect_usb_format(ua);
1266         if (err < 0)
1267                 goto probe_error;
1268 
1269         name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1270         strcpy(card->driver, "UA-101");
1271         strcpy(card->shortname, name);
1272         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1273         snprintf(ua->card->longname, sizeof(ua->card->longname),
1274                  "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1275                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1276                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1277 
1278         err = alloc_stream_buffers(ua, &ua->capture);
1279         if (err < 0)
1280                 goto probe_error;
1281         err = alloc_stream_buffers(ua, &ua->playback);
1282         if (err < 0)
1283                 goto probe_error;
1284 
1285         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1286         if (err < 0)
1287                 goto probe_error;
1288         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1289         if (err < 0)
1290                 goto probe_error;
1291 
1292         err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1293         if (err < 0)
1294                 goto probe_error;
1295         ua->pcm->private_data = ua;
1296         strcpy(ua->pcm->name, name);
1297         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1298         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1299 
1300         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1301                                  &ua->midi_list, &midi_quirk);
1302         if (err < 0)
1303                 goto probe_error;
1304 
1305         err = snd_card_register(card);
1306         if (err < 0)
1307                 goto probe_error;
1308 
1309         usb_set_intfdata(interface, ua);
1310         devices_used |= 1 << card_index;
1311 
1312         mutex_unlock(&devices_mutex);
1313         return 0;
1314 
1315 probe_error:
1316         free_usb_related_resources(ua, interface);
1317         snd_card_free(card);
1318         mutex_unlock(&devices_mutex);
1319         return err;
1320 }
1321 
1322 static void ua101_disconnect(struct usb_interface *interface)
1323 {
1324         struct ua101 *ua = usb_get_intfdata(interface);
1325         struct list_head *midi;
1326 
1327         if (!ua)
1328                 return;
1329 
1330         mutex_lock(&devices_mutex);
1331 
1332         set_bit(DISCONNECTED, &ua->states);
1333         wake_up(&ua->rate_feedback_wait);
1334 
1335         /* make sure that userspace cannot create new requests */
1336         snd_card_disconnect(ua->card);
1337 
1338         /* make sure that there are no pending USB requests */
1339         list_for_each(midi, &ua->midi_list)
1340                 snd_usbmidi_disconnect(midi);
1341         abort_alsa_playback(ua);
1342         abort_alsa_capture(ua);
1343         mutex_lock(&ua->mutex);
1344         stop_usb_playback(ua);
1345         stop_usb_capture(ua);
1346         mutex_unlock(&ua->mutex);
1347 
1348         free_usb_related_resources(ua, interface);
1349 
1350         devices_used &= ~(1 << ua->card_index);
1351 
1352         snd_card_free_when_closed(ua->card);
1353 
1354         mutex_unlock(&devices_mutex);
1355 }
1356 
1357 static const struct usb_device_id ua101_ids[] = {
1358         { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1359         { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1360         { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1361         { }
1362 };
1363 MODULE_DEVICE_TABLE(usb, ua101_ids);
1364 
1365 static struct usb_driver ua101_driver = {
1366         .name = "snd-ua101",
1367         .id_table = ua101_ids,
1368         .probe = ua101_probe,
1369         .disconnect = ua101_disconnect,
1370 #if 0
1371         .suspend = ua101_suspend,
1372         .resume = ua101_resume,
1373 #endif
1374 };
1375 
1376 module_usb_driver(ua101_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/sound/usb/misc/ua101.c

DEFINITIONS
