Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/sound/usb/misc/ua101.c

  1 /*
  2  * Edirol UA-101/UA-1000 driver
  3  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
  4  *
  5  * This driver is free software: you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License, version 2.
  7  *
  8  * This driver is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public License
 14  * along with this driver.  If not, see <http://www.gnu.org/licenses/>.
 15  */
 16 
 17 #include <linux/init.h>
 18 #include <linux/module.h>
 19 #include <linux/slab.h>
 20 #include <linux/usb.h>
 21 #include <linux/usb/audio.h>
 22 #include <sound/core.h>
 23 #include <sound/initval.h>
 24 #include <sound/pcm.h>
 25 #include <sound/pcm_params.h>
 26 #include "../usbaudio.h"
 27 #include "../midi.h"
 28 
 29 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
 30 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
 31 MODULE_LICENSE("GPL v2");
 32 MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101},{Edirol,UA-1000}}");
 33 
 34 /*
 35  * Should not be lower than the minimum scheduling delay of the host
 36  * controller.  Some Intel controllers need more than one frame; as long as
 37  * that driver doesn't tell us about this, use 1.5 frames just to be sure.
 38  */
 39 #define MIN_QUEUE_LENGTH        12
 40 /* Somewhat random. */
 41 #define MAX_QUEUE_LENGTH        30
 42 /*
 43  * This magic value optimizes memory usage efficiency for the UA-101's packet
 44  * sizes at all sample rates, taking into account the stupid cache pool sizes
 45  * that usb_alloc_coherent() uses.
 46  */
 47 #define DEFAULT_QUEUE_LENGTH    21
 48 
 49 #define MAX_PACKET_SIZE         672 /* hardware specific */
 50 #define MAX_MEMORY_BUFFERS      DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
 51                                              PAGE_SIZE / MAX_PACKET_SIZE)
 52 
 53 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 54 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 55 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 56 static unsigned int queue_length = 21;
 57 
 58 module_param_array(index, int, NULL, 0444);
 59 MODULE_PARM_DESC(index, "card index");
 60 module_param_array(id, charp, NULL, 0444);
 61 MODULE_PARM_DESC(id, "ID string");
 62 module_param_array(enable, bool, NULL, 0444);
 63 MODULE_PARM_DESC(enable, "enable card");
 64 module_param(queue_length, uint, 0644);
 65 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
 66                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
 67 
 68 enum {
 69         INTF_PLAYBACK,
 70         INTF_CAPTURE,
 71         INTF_MIDI,
 72 
 73         INTF_COUNT
 74 };
 75 
 76 /* bits in struct ua101::states */
 77 enum {
 78         USB_CAPTURE_RUNNING,
 79         USB_PLAYBACK_RUNNING,
 80         ALSA_CAPTURE_OPEN,
 81         ALSA_PLAYBACK_OPEN,
 82         ALSA_CAPTURE_RUNNING,
 83         ALSA_PLAYBACK_RUNNING,
 84         CAPTURE_URB_COMPLETED,
 85         PLAYBACK_URB_COMPLETED,
 86         DISCONNECTED,
 87 };
 88 
 89 struct ua101 {
 90         struct usb_device *dev;
 91         struct snd_card *card;
 92         struct usb_interface *intf[INTF_COUNT];
 93         int card_index;
 94         struct snd_pcm *pcm;
 95         struct list_head midi_list;
 96         u64 format_bit;
 97         unsigned int rate;
 98         unsigned int packets_per_second;
 99         spinlock_t lock;
100         struct mutex mutex;
101         unsigned long states;
102 
103         /* FIFO to synchronize playback rate to capture rate */
104         unsigned int rate_feedback_start;
105         unsigned int rate_feedback_count;
106         u8 rate_feedback[MAX_QUEUE_LENGTH];
107 
108         struct list_head ready_playback_urbs;
109         struct tasklet_struct playback_tasklet;
110         wait_queue_head_t alsa_capture_wait;
111         wait_queue_head_t rate_feedback_wait;
112         wait_queue_head_t alsa_playback_wait;
113         struct ua101_stream {
114                 struct snd_pcm_substream *substream;
115                 unsigned int usb_pipe;
116                 unsigned int channels;
117                 unsigned int frame_bytes;
118                 unsigned int max_packet_bytes;
119                 unsigned int period_pos;
120                 unsigned int buffer_pos;
121                 unsigned int queue_length;
122                 struct ua101_urb {
123                         struct urb urb;
124                         struct usb_iso_packet_descriptor iso_frame_desc[1];
125                         struct list_head ready_list;
126                 } *urbs[MAX_QUEUE_LENGTH];
127                 struct {
128                         unsigned int size;
129                         void *addr;
130                         dma_addr_t dma;
131                 } buffers[MAX_MEMORY_BUFFERS];
132         } capture, playback;
133 };
134 
135 static DEFINE_MUTEX(devices_mutex);
136 static unsigned int devices_used;
137 static struct usb_driver ua101_driver;
138 
139 static void abort_alsa_playback(struct ua101 *ua);
140 static void abort_alsa_capture(struct ua101 *ua);
141 
142 static const char *usb_error_string(int err)
143 {
144         switch (err) {
145         case -ENODEV:
146                 return "no device";
147         case -ENOENT:
148                 return "endpoint not enabled";
149         case -EPIPE:
150                 return "endpoint stalled";
151         case -ENOSPC:
152                 return "not enough bandwidth";
153         case -ESHUTDOWN:
154                 return "device disabled";
155         case -EHOSTUNREACH:
156                 return "device suspended";
157         case -EINVAL:
158         case -EAGAIN:
159         case -EFBIG:
160         case -EMSGSIZE:
161                 return "internal error";
162         default:
163                 return "unknown error";
164         }
165 }
166 
167 static void abort_usb_capture(struct ua101 *ua)
168 {
169         if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
170                 wake_up(&ua->alsa_capture_wait);
171                 wake_up(&ua->rate_feedback_wait);
172         }
173 }
174 
175 static void abort_usb_playback(struct ua101 *ua)
176 {
177         if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
178                 wake_up(&ua->alsa_playback_wait);
179 }
180 
181 static void playback_urb_complete(struct urb *usb_urb)
182 {
183         struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
184         struct ua101 *ua = urb->urb.context;
185         unsigned long flags;
186 
187         if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
188                      urb->urb.status == -ENODEV ||      /* device removed */
189                      urb->urb.status == -ECONNRESET ||  /* unlinked */
190                      urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
191                 abort_usb_playback(ua);
192                 abort_alsa_playback(ua);
193                 return;
194         }
195 
196         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
197                 /* append URB to FIFO */
198                 spin_lock_irqsave(&ua->lock, flags);
199                 list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
200                 if (ua->rate_feedback_count > 0)
201                         tasklet_schedule(&ua->playback_tasklet);
202                 ua->playback.substream->runtime->delay -=
203                                 urb->urb.iso_frame_desc[0].length /
204                                                 ua->playback.frame_bytes;
205                 spin_unlock_irqrestore(&ua->lock, flags);
206         }
207 }
208 
209 static void first_playback_urb_complete(struct urb *urb)
210 {
211         struct ua101 *ua = urb->context;
212 
213         urb->complete = playback_urb_complete;
214         playback_urb_complete(urb);
215 
216         set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
217         wake_up(&ua->alsa_playback_wait);
218 }
219 
220 /* copy data from the ALSA ring buffer into the URB buffer */
221 static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
222                                unsigned int frames)
223 {
224         struct snd_pcm_runtime *runtime;
225         unsigned int frame_bytes, frames1;
226         const u8 *source;
227 
228         runtime = stream->substream->runtime;
229         frame_bytes = stream->frame_bytes;
230         source = runtime->dma_area + stream->buffer_pos * frame_bytes;
231         if (stream->buffer_pos + frames <= runtime->buffer_size) {
232                 memcpy(urb->transfer_buffer, source, frames * frame_bytes);
233         } else {
234                 /* wrap around at end of ring buffer */
235                 frames1 = runtime->buffer_size - stream->buffer_pos;
236                 memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
237                 memcpy(urb->transfer_buffer + frames1 * frame_bytes,
238                        runtime->dma_area, (frames - frames1) * frame_bytes);
239         }
240 
241         stream->buffer_pos += frames;
242         if (stream->buffer_pos >= runtime->buffer_size)
243                 stream->buffer_pos -= runtime->buffer_size;
244         stream->period_pos += frames;
245         if (stream->period_pos >= runtime->period_size) {
246                 stream->period_pos -= runtime->period_size;
247                 return true;
248         }
249         return false;
250 }
251 
252 static inline void add_with_wraparound(struct ua101 *ua,
253                                        unsigned int *value, unsigned int add)
254 {
255         *value += add;
256         if (*value >= ua->playback.queue_length)
257                 *value -= ua->playback.queue_length;
258 }
259 
260 static void playback_tasklet(unsigned long data)
261 {
262         struct ua101 *ua = (void *)data;
263         unsigned long flags;
264         unsigned int frames;
265         struct ua101_urb *urb;
266         bool do_period_elapsed = false;
267         int err;
268 
269         if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
270                 return;
271 
272         /*
273          * Synchronizing the playback rate to the capture rate is done by using
274          * the same sequence of packet sizes for both streams.
275          * Submitting a playback URB therefore requires both a ready URB and
276          * the size of the corresponding capture packet, i.e., both playback
277          * and capture URBs must have been completed.  Since the USB core does
278          * not guarantee that playback and capture complete callbacks are
279          * called alternately, we use two FIFOs for packet sizes and read URBs;
280          * submitting playback URBs is possible as long as both FIFOs are
281          * nonempty.
282          */
283         spin_lock_irqsave(&ua->lock, flags);
284         while (ua->rate_feedback_count > 0 &&
285                !list_empty(&ua->ready_playback_urbs)) {
286                 /* take packet size out of FIFO */
287                 frames = ua->rate_feedback[ua->rate_feedback_start];
288                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
289                 ua->rate_feedback_count--;
290 
291                 /* take URB out of FIFO */
292                 urb = list_first_entry(&ua->ready_playback_urbs,
293                                        struct ua101_urb, ready_list);
294                 list_del(&urb->ready_list);
295 
296                 /* fill packet with data or silence */
297                 urb->urb.iso_frame_desc[0].length =
298                         frames * ua->playback.frame_bytes;
299                 if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
300                         do_period_elapsed |= copy_playback_data(&ua->playback,
301                                                                 &urb->urb,
302                                                                 frames);
303                 else
304                         memset(urb->urb.transfer_buffer, 0,
305                                urb->urb.iso_frame_desc[0].length);
306 
307                 /* and off you go ... */
308                 err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
309                 if (unlikely(err < 0)) {
310                         spin_unlock_irqrestore(&ua->lock, flags);
311                         abort_usb_playback(ua);
312                         abort_alsa_playback(ua);
313                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
314                                 err, usb_error_string(err));
315                         return;
316                 }
317                 ua->playback.substream->runtime->delay += frames;
318         }
319         spin_unlock_irqrestore(&ua->lock, flags);
320         if (do_period_elapsed)
321                 snd_pcm_period_elapsed(ua->playback.substream);
322 }
323 
324 /* copy data from the URB buffer into the ALSA ring buffer */
325 static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
326                               unsigned int frames)
327 {
328         struct snd_pcm_runtime *runtime;
329         unsigned int frame_bytes, frames1;
330         u8 *dest;
331 
332         runtime = stream->substream->runtime;
333         frame_bytes = stream->frame_bytes;
334         dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
335         if (stream->buffer_pos + frames <= runtime->buffer_size) {
336                 memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
337         } else {
338                 /* wrap around at end of ring buffer */
339                 frames1 = runtime->buffer_size - stream->buffer_pos;
340                 memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
341                 memcpy(runtime->dma_area,
342                        urb->transfer_buffer + frames1 * frame_bytes,
343                        (frames - frames1) * frame_bytes);
344         }
345 
346         stream->buffer_pos += frames;
347         if (stream->buffer_pos >= runtime->buffer_size)
348                 stream->buffer_pos -= runtime->buffer_size;
349         stream->period_pos += frames;
350         if (stream->period_pos >= runtime->period_size) {
351                 stream->period_pos -= runtime->period_size;
352                 return true;
353         }
354         return false;
355 }
356 
357 static void capture_urb_complete(struct urb *urb)
358 {
359         struct ua101 *ua = urb->context;
360         struct ua101_stream *stream = &ua->capture;
361         unsigned long flags;
362         unsigned int frames, write_ptr;
363         bool do_period_elapsed;
364         int err;
365 
366         if (unlikely(urb->status == -ENOENT ||          /* unlinked */
367                      urb->status == -ENODEV ||          /* device removed */
368                      urb->status == -ECONNRESET ||      /* unlinked */
369                      urb->status == -ESHUTDOWN))        /* device disabled */
370                 goto stream_stopped;
371 
372         if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
373                 frames = urb->iso_frame_desc[0].actual_length /
374                         stream->frame_bytes;
375         else
376                 frames = 0;
377 
378         spin_lock_irqsave(&ua->lock, flags);
379 
380         if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
381                 do_period_elapsed = copy_capture_data(stream, urb, frames);
382         else
383                 do_period_elapsed = false;
384 
385         if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
386                 err = usb_submit_urb(urb, GFP_ATOMIC);
387                 if (unlikely(err < 0)) {
388                         spin_unlock_irqrestore(&ua->lock, flags);
389                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
390                                 err, usb_error_string(err));
391                         goto stream_stopped;
392                 }
393 
394                 /* append packet size to FIFO */
395                 write_ptr = ua->rate_feedback_start;
396                 add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
397                 ua->rate_feedback[write_ptr] = frames;
398                 if (ua->rate_feedback_count < ua->playback.queue_length) {
399                         ua->rate_feedback_count++;
400                         if (ua->rate_feedback_count ==
401                                                 ua->playback.queue_length)
402                                 wake_up(&ua->rate_feedback_wait);
403                 } else {
404                         /*
405                          * Ring buffer overflow; this happens when the playback
406                          * stream is not running.  Throw away the oldest entry,
407                          * so that the playback stream, when it starts, sees
408                          * the most recent packet sizes.
409                          */
410                         add_with_wraparound(ua, &ua->rate_feedback_start, 1);
411                 }
412                 if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
413                     !list_empty(&ua->ready_playback_urbs))
414                         tasklet_schedule(&ua->playback_tasklet);
415         }
416 
417         spin_unlock_irqrestore(&ua->lock, flags);
418 
419         if (do_period_elapsed)
420                 snd_pcm_period_elapsed(stream->substream);
421 
422         return;
423 
424 stream_stopped:
425         abort_usb_playback(ua);
426         abort_usb_capture(ua);
427         abort_alsa_playback(ua);
428         abort_alsa_capture(ua);
429 }
430 
431 static void first_capture_urb_complete(struct urb *urb)
432 {
433         struct ua101 *ua = urb->context;
434 
435         urb->complete = capture_urb_complete;
436         capture_urb_complete(urb);
437 
438         set_bit(CAPTURE_URB_COMPLETED, &ua->states);
439         wake_up(&ua->alsa_capture_wait);
440 }
441 
442 static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
443 {
444         unsigned int i;
445 
446         for (i = 0; i < stream->queue_length; ++i) {
447                 int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
448                 if (err < 0) {
449                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
450                                 err, usb_error_string(err));
451                         return err;
452                 }
453         }
454         return 0;
455 }
456 
457 static void kill_stream_urbs(struct ua101_stream *stream)
458 {
459         unsigned int i;
460 
461         for (i = 0; i < stream->queue_length; ++i)
462                 if (stream->urbs[i])
463                         usb_kill_urb(&stream->urbs[i]->urb);
464 }
465 
466 static 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 
484 static 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 
502 static 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 
511 static 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 
539 static 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 
550 static 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 
614 static void abort_alsa_capture(struct ua101 *ua)
615 {
616         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
617                 snd_pcm_stop_xrun(ua->capture.substream);
618 }
619 
620 static void abort_alsa_playback(struct ua101 *ua)
621 {
622         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
623                 snd_pcm_stop_xrun(ua->playback.substream);
624 }
625 
626 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
627                          unsigned int channels)
628 {
629         int err;
630 
631         substream->runtime->hw.info =
632                 SNDRV_PCM_INFO_MMAP |
633                 SNDRV_PCM_INFO_MMAP_VALID |
634                 SNDRV_PCM_INFO_BATCH |
635                 SNDRV_PCM_INFO_INTERLEAVED |
636                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
637                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
638         substream->runtime->hw.formats = ua->format_bit;
639         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
640         substream->runtime->hw.rate_min = ua->rate;
641         substream->runtime->hw.rate_max = ua->rate;
642         substream->runtime->hw.channels_min = channels;
643         substream->runtime->hw.channels_max = channels;
644         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
645         substream->runtime->hw.period_bytes_min = 1;
646         substream->runtime->hw.period_bytes_max = UINT_MAX;
647         substream->runtime->hw.periods_min = 2;
648         substream->runtime->hw.periods_max = UINT_MAX;
649         err = snd_pcm_hw_constraint_minmax(substream->runtime,
650                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
651                                            1500000 / ua->packets_per_second,
652                                            UINT_MAX);
653         if (err < 0)
654                 return err;
655         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
656         return err;
657 }
658 
659 static int capture_pcm_open(struct snd_pcm_substream *substream)
660 {
661         struct ua101 *ua = substream->private_data;
662         int err;
663 
664         ua->capture.substream = substream;
665         err = set_stream_hw(ua, substream, ua->capture.channels);
666         if (err < 0)
667                 return err;
668         substream->runtime->hw.fifo_size =
669                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
670         substream->runtime->delay = substream->runtime->hw.fifo_size;
671 
672         mutex_lock(&ua->mutex);
673         err = start_usb_capture(ua);
674         if (err >= 0)
675                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
676         mutex_unlock(&ua->mutex);
677         return err;
678 }
679 
680 static int playback_pcm_open(struct snd_pcm_substream *substream)
681 {
682         struct ua101 *ua = substream->private_data;
683         int err;
684 
685         ua->playback.substream = substream;
686         err = set_stream_hw(ua, substream, ua->playback.channels);
687         if (err < 0)
688                 return err;
689         substream->runtime->hw.fifo_size =
690                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
691                                   ua->packets_per_second);
692 
693         mutex_lock(&ua->mutex);
694         err = start_usb_capture(ua);
695         if (err < 0)
696                 goto error;
697         err = start_usb_playback(ua);
698         if (err < 0) {
699                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
700                         stop_usb_capture(ua);
701                 goto error;
702         }
703         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
704 error:
705         mutex_unlock(&ua->mutex);
706         return err;
707 }
708 
709 static int capture_pcm_close(struct snd_pcm_substream *substream)
710 {
711         struct ua101 *ua = substream->private_data;
712 
713         mutex_lock(&ua->mutex);
714         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
715         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
716                 stop_usb_capture(ua);
717         mutex_unlock(&ua->mutex);
718         return 0;
719 }
720 
721 static int playback_pcm_close(struct snd_pcm_substream *substream)
722 {
723         struct ua101 *ua = substream->private_data;
724 
725         mutex_lock(&ua->mutex);
726         stop_usb_playback(ua);
727         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
728         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
729                 stop_usb_capture(ua);
730         mutex_unlock(&ua->mutex);
731         return 0;
732 }
733 
734 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
735                                  struct snd_pcm_hw_params *hw_params)
736 {
737         struct ua101 *ua = substream->private_data;
738         int err;
739 
740         mutex_lock(&ua->mutex);
741         err = start_usb_capture(ua);
742         mutex_unlock(&ua->mutex);
743         if (err < 0)
744                 return err;
745 
746         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
747                                                 params_buffer_bytes(hw_params));
748 }
749 
750 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
751                                   struct snd_pcm_hw_params *hw_params)
752 {
753         struct ua101 *ua = substream->private_data;
754         int err;
755 
756         mutex_lock(&ua->mutex);
757         err = start_usb_capture(ua);
758         if (err >= 0)
759                 err = start_usb_playback(ua);
760         mutex_unlock(&ua->mutex);
761         if (err < 0)
762                 return err;
763 
764         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
765                                                 params_buffer_bytes(hw_params));
766 }
767 
768 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
769 {
770         return snd_pcm_lib_free_vmalloc_buffer(substream);
771 }
772 
773 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
774 {
775         struct ua101 *ua = substream->private_data;
776         int err;
777 
778         mutex_lock(&ua->mutex);
779         err = start_usb_capture(ua);
780         mutex_unlock(&ua->mutex);
781         if (err < 0)
782                 return err;
783 
784         /*
785          * The EHCI driver schedules the first packet of an iso stream at 10 ms
786          * in the future, i.e., no data is actually captured for that long.
787          * Take the wait here so that the stream is known to be actually
788          * running when the start trigger has been called.
789          */
790         wait_event(ua->alsa_capture_wait,
791                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
792                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
793         if (test_bit(DISCONNECTED, &ua->states))
794                 return -ENODEV;
795         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
796                 return -EIO;
797 
798         ua->capture.period_pos = 0;
799         ua->capture.buffer_pos = 0;
800         return 0;
801 }
802 
803 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
804 {
805         struct ua101 *ua = substream->private_data;
806         int err;
807 
808         mutex_lock(&ua->mutex);
809         err = start_usb_capture(ua);
810         if (err >= 0)
811                 err = start_usb_playback(ua);
812         mutex_unlock(&ua->mutex);
813         if (err < 0)
814                 return err;
815 
816         /* see the comment in capture_pcm_prepare() */
817         wait_event(ua->alsa_playback_wait,
818                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
819                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
820         if (test_bit(DISCONNECTED, &ua->states))
821                 return -ENODEV;
822         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
823                 return -EIO;
824 
825         substream->runtime->delay = 0;
826         ua->playback.period_pos = 0;
827         ua->playback.buffer_pos = 0;
828         return 0;
829 }
830 
831 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
832 {
833         struct ua101 *ua = substream->private_data;
834 
835         switch (cmd) {
836         case SNDRV_PCM_TRIGGER_START:
837                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
838                         return -EIO;
839                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
840                 return 0;
841         case SNDRV_PCM_TRIGGER_STOP:
842                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
843                 return 0;
844         default:
845                 return -EINVAL;
846         }
847 }
848 
849 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
850 {
851         struct ua101 *ua = substream->private_data;
852 
853         switch (cmd) {
854         case SNDRV_PCM_TRIGGER_START:
855                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
856                         return -EIO;
857                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
858                 return 0;
859         case SNDRV_PCM_TRIGGER_STOP:
860                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
861                 return 0;
862         default:
863                 return -EINVAL;
864         }
865 }
866 
867 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
868                                                   struct ua101_stream *stream)
869 {
870         unsigned long flags;
871         unsigned int pos;
872 
873         spin_lock_irqsave(&ua->lock, flags);
874         pos = stream->buffer_pos;
875         spin_unlock_irqrestore(&ua->lock, flags);
876         return pos;
877 }
878 
879 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
880 {
881         struct ua101 *ua = subs->private_data;
882 
883         return ua101_pcm_pointer(ua, &ua->capture);
884 }
885 
886 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
887 {
888         struct ua101 *ua = subs->private_data;
889 
890         return ua101_pcm_pointer(ua, &ua->playback);
891 }
892 
893 static struct snd_pcm_ops capture_pcm_ops = {
894         .open = capture_pcm_open,
895         .close = capture_pcm_close,
896         .ioctl = snd_pcm_lib_ioctl,
897         .hw_params = capture_pcm_hw_params,
898         .hw_free = ua101_pcm_hw_free,
899         .prepare = capture_pcm_prepare,
900         .trigger = capture_pcm_trigger,
901         .pointer = capture_pcm_pointer,
902         .page = snd_pcm_lib_get_vmalloc_page,
903         .mmap = snd_pcm_lib_mmap_vmalloc,
904 };
905 
906 static struct snd_pcm_ops playback_pcm_ops = {
907         .open = playback_pcm_open,
908         .close = playback_pcm_close,
909         .ioctl = snd_pcm_lib_ioctl,
910         .hw_params = playback_pcm_hw_params,
911         .hw_free = ua101_pcm_hw_free,
912         .prepare = playback_pcm_prepare,
913         .trigger = playback_pcm_trigger,
914         .pointer = playback_pcm_pointer,
915         .page = snd_pcm_lib_get_vmalloc_page,
916         .mmap = snd_pcm_lib_mmap_vmalloc,
917 };
918 
919 static const struct uac_format_type_i_discrete_descriptor *
920 find_format_descriptor(struct usb_interface *interface)
921 {
922         struct usb_host_interface *alt;
923         u8 *extra;
924         int extralen;
925 
926         if (interface->num_altsetting != 2) {
927                 dev_err(&interface->dev, "invalid num_altsetting\n");
928                 return NULL;
929         }
930 
931         alt = &interface->altsetting[0];
932         if (alt->desc.bNumEndpoints != 0) {
933                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
934                 return NULL;
935         }
936 
937         alt = &interface->altsetting[1];
938         if (alt->desc.bNumEndpoints != 1) {
939                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
940                 return NULL;
941         }
942 
943         extra = alt->extra;
944         extralen = alt->extralen;
945         while (extralen >= sizeof(struct usb_descriptor_header)) {
946                 struct uac_format_type_i_discrete_descriptor *desc;
947 
948                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
949                 if (desc->bLength > extralen) {
950                         dev_err(&interface->dev, "descriptor overflow\n");
951                         return NULL;
952                 }
953                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
954                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
955                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
956                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
957                             desc->bSamFreqType != 1) {
958                                 dev_err(&interface->dev,
959                                         "invalid format type\n");
960                                 return NULL;
961                         }
962                         return desc;
963                 }
964                 extralen -= desc->bLength;
965                 extra += desc->bLength;
966         }
967         dev_err(&interface->dev, "sample format descriptor not found\n");
968         return NULL;
969 }
970 
971 static int detect_usb_format(struct ua101 *ua)
972 {
973         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
974         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
975         const struct usb_endpoint_descriptor *epd;
976         unsigned int rate2;
977 
978         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
979         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
980         if (!fmt_capture || !fmt_playback)
981                 return -ENXIO;
982 
983         switch (fmt_capture->bSubframeSize) {
984         case 3:
985                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
986                 break;
987         case 4:
988                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
989                 break;
990         default:
991                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
992                 return -ENXIO;
993         }
994         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
995                 dev_err(&ua->dev->dev,
996                         "playback/capture sample widths do not match\n");
997                 return -ENXIO;
998         }
999 
1000         if (fmt_capture->bBitResolution != 24 ||
1001             fmt_playback->bBitResolution != 24) {
1002                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
1003                 return -ENXIO;
1004         }
1005 
1006         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1007         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1008         if (ua->rate != rate2) {
1009                 dev_err(&ua->dev->dev,
1010                         "playback/capture rates do not match: %u/%u\n",
1011                         rate2, ua->rate);
1012                 return -ENXIO;
1013         }
1014 
1015         switch (ua->dev->speed) {
1016         case USB_SPEED_FULL:
1017                 ua->packets_per_second = 1000;
1018                 break;
1019         case USB_SPEED_HIGH:
1020                 ua->packets_per_second = 8000;
1021                 break;
1022         default:
1023                 dev_err(&ua->dev->dev, "unknown device speed\n");
1024                 return -ENXIO;
1025         }
1026 
1027         ua->capture.channels = fmt_capture->bNrChannels;
1028         ua->playback.channels = fmt_playback->bNrChannels;
1029         ua->capture.frame_bytes =
1030                 fmt_capture->bSubframeSize * ua->capture.channels;
1031         ua->playback.frame_bytes =
1032                 fmt_playback->bSubframeSize * ua->playback.channels;
1033 
1034         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1035         if (!usb_endpoint_is_isoc_in(epd)) {
1036                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1037                 return -ENXIO;
1038         }
1039         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1040         ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1041 
1042         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1043         if (!usb_endpoint_is_isoc_out(epd)) {
1044                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1045                 return -ENXIO;
1046         }
1047         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1048         ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1049         return 0;
1050 }
1051 
1052 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1053 {
1054         unsigned int remaining_packets, packets, packets_per_page, i;
1055         size_t size;
1056 
1057         stream->queue_length = queue_length;
1058         stream->queue_length = max(stream->queue_length,
1059                                    (unsigned int)MIN_QUEUE_LENGTH);
1060         stream->queue_length = min(stream->queue_length,
1061                                    (unsigned int)MAX_QUEUE_LENGTH);
1062 
1063         /*
1064          * The cache pool sizes used by usb_alloc_coherent() (128, 512, 2048) are
1065          * quite bad when used with the packet sizes of this device (e.g. 280,
1066          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1067          * a smaller buffer only for the last chunk.
1068          */
1069         remaining_packets = stream->queue_length;
1070         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1071         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1072                 packets = min(remaining_packets, packets_per_page);
1073                 size = packets * stream->max_packet_bytes;
1074                 stream->buffers[i].addr =
1075                         usb_alloc_coherent(ua->dev, size, GFP_KERNEL,
1076                                            &stream->buffers[i].dma);
1077                 if (!stream->buffers[i].addr)
1078                         return -ENOMEM;
1079                 stream->buffers[i].size = size;
1080                 remaining_packets -= packets;
1081                 if (!remaining_packets)
1082                         break;
1083         }
1084         if (remaining_packets) {
1085                 dev_err(&ua->dev->dev, "too many packets\n");
1086                 return -ENXIO;
1087         }
1088         return 0;
1089 }
1090 
1091 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1092 {
1093         unsigned int i;
1094 
1095         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1096                 usb_free_coherent(ua->dev,
1097                                   stream->buffers[i].size,
1098                                   stream->buffers[i].addr,
1099                                   stream->buffers[i].dma);
1100 }
1101 
1102 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1103                              void (*urb_complete)(struct urb *))
1104 {
1105         unsigned max_packet_size = stream->max_packet_bytes;
1106         struct ua101_urb *urb;
1107         unsigned int b, u = 0;
1108 
1109         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1110                 unsigned int size = stream->buffers[b].size;
1111                 u8 *addr = stream->buffers[b].addr;
1112                 dma_addr_t dma = stream->buffers[b].dma;
1113 
1114                 while (size >= max_packet_size) {
1115                         if (u >= stream->queue_length)
1116                                 goto bufsize_error;
1117                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1118                         if (!urb)
1119                                 return -ENOMEM;
1120                         usb_init_urb(&urb->urb);
1121                         urb->urb.dev = ua->dev;
1122                         urb->urb.pipe = stream->usb_pipe;
1123                         urb->urb.transfer_flags = URB_NO_TRANSFER_DMA_MAP;
1124                         urb->urb.transfer_buffer = addr;
1125                         urb->urb.transfer_dma = dma;
1126                         urb->urb.transfer_buffer_length = max_packet_size;
1127                         urb->urb.number_of_packets = 1;
1128                         urb->urb.interval = 1;
1129                         urb->urb.context = ua;
1130                         urb->urb.complete = urb_complete;
1131                         urb->urb.iso_frame_desc[0].offset = 0;
1132                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1133                         stream->urbs[u++] = urb;
1134                         size -= max_packet_size;
1135                         addr += max_packet_size;
1136                         dma += max_packet_size;
1137                 }
1138         }
1139         if (u == stream->queue_length)
1140                 return 0;
1141 bufsize_error:
1142         dev_err(&ua->dev->dev, "internal buffer size error\n");
1143         return -ENXIO;
1144 }
1145 
1146 static void free_stream_urbs(struct ua101_stream *stream)
1147 {
1148         unsigned int i;
1149 
1150         for (i = 0; i < stream->queue_length; ++i) {
1151                 kfree(stream->urbs[i]);
1152                 stream->urbs[i] = NULL;
1153         }
1154 }
1155 
1156 static void free_usb_related_resources(struct ua101 *ua,
1157                                        struct usb_interface *interface)
1158 {
1159         unsigned int i;
1160         struct usb_interface *intf;
1161 
1162         mutex_lock(&ua->mutex);
1163         free_stream_urbs(&ua->capture);
1164         free_stream_urbs(&ua->playback);
1165         mutex_unlock(&ua->mutex);
1166         free_stream_buffers(ua, &ua->capture);
1167         free_stream_buffers(ua, &ua->playback);
1168 
1169         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i) {
1170                 mutex_lock(&ua->mutex);
1171                 intf = ua->intf[i];
1172                 ua->intf[i] = NULL;
1173                 mutex_unlock(&ua->mutex);
1174                 if (intf) {
1175                         usb_set_intfdata(intf, NULL);
1176                         if (intf != interface)
1177                                 usb_driver_release_interface(&ua101_driver,
1178                                                              intf);
1179                 }
1180         }
1181 }
1182 
1183 static void ua101_card_free(struct snd_card *card)
1184 {
1185         struct ua101 *ua = card->private_data;
1186 
1187         mutex_destroy(&ua->mutex);
1188 }
1189 
1190 static int ua101_probe(struct usb_interface *interface,
1191                        const struct usb_device_id *usb_id)
1192 {
1193         static const struct snd_usb_midi_endpoint_info midi_ep = {
1194                 .out_cables = 0x0001,
1195                 .in_cables = 0x0001
1196         };
1197         static const struct snd_usb_audio_quirk midi_quirk = {
1198                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1199                 .data = &midi_ep
1200         };
1201         static const int intf_numbers[2][3] = {
1202                 {       /* UA-101 */
1203                         [INTF_PLAYBACK] = 0,
1204                         [INTF_CAPTURE] = 1,
1205                         [INTF_MIDI] = 2,
1206                 },
1207                 {       /* UA-1000 */
1208                         [INTF_CAPTURE] = 1,
1209                         [INTF_PLAYBACK] = 2,
1210                         [INTF_MIDI] = 3,
1211                 },
1212         };
1213         struct snd_card *card;
1214         struct ua101 *ua;
1215         unsigned int card_index, i;
1216         int is_ua1000;
1217         const char *name;
1218         char usb_path[32];
1219         int err;
1220 
1221         is_ua1000 = usb_id->idProduct == 0x0044;
1222 
1223         if (interface->altsetting->desc.bInterfaceNumber !=
1224             intf_numbers[is_ua1000][0])
1225                 return -ENODEV;
1226 
1227         mutex_lock(&devices_mutex);
1228 
1229         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1230                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1231                         break;
1232         if (card_index >= SNDRV_CARDS) {
1233                 mutex_unlock(&devices_mutex);
1234                 return -ENOENT;
1235         }
1236         err = snd_card_new(&interface->dev,
1237                            index[card_index], id[card_index], THIS_MODULE,
1238                            sizeof(*ua), &card);
1239         if (err < 0) {
1240                 mutex_unlock(&devices_mutex);
1241                 return err;
1242         }
1243         card->private_free = ua101_card_free;
1244         ua = card->private_data;
1245         ua->dev = interface_to_usbdev(interface);
1246         ua->card = card;
1247         ua->card_index = card_index;
1248         INIT_LIST_HEAD(&ua->midi_list);
1249         spin_lock_init(&ua->lock);
1250         mutex_init(&ua->mutex);
1251         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1252         tasklet_init(&ua->playback_tasklet,
1253                      playback_tasklet, (unsigned long)ua);
1254         init_waitqueue_head(&ua->alsa_capture_wait);
1255         init_waitqueue_head(&ua->rate_feedback_wait);
1256         init_waitqueue_head(&ua->alsa_playback_wait);
1257 
1258         ua->intf[0] = interface;
1259         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1260                 ua->intf[i] = usb_ifnum_to_if(ua->dev,
1261                                               intf_numbers[is_ua1000][i]);
1262                 if (!ua->intf[i]) {
1263                         dev_err(&ua->dev->dev, "interface %u not found\n",
1264                                 intf_numbers[is_ua1000][i]);
1265                         err = -ENXIO;
1266                         goto probe_error;
1267                 }
1268                 err = usb_driver_claim_interface(&ua101_driver,
1269                                                  ua->intf[i], ua);
1270                 if (err < 0) {
1271                         ua->intf[i] = NULL;
1272                         err = -EBUSY;
1273                         goto probe_error;
1274                 }
1275         }
1276 
1277         err = detect_usb_format(ua);
1278         if (err < 0)
1279                 goto probe_error;
1280 
1281         name = usb_id->idProduct == 0x0044 ? "UA-1000" : "UA-101";
1282         strcpy(card->driver, "UA-101");
1283         strcpy(card->shortname, name);
1284         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1285         snprintf(ua->card->longname, sizeof(ua->card->longname),
1286                  "EDIROL %s (serial %s), %u Hz at %s, %s speed", name,
1287                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1288                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1289 
1290         err = alloc_stream_buffers(ua, &ua->capture);
1291         if (err < 0)
1292                 goto probe_error;
1293         err = alloc_stream_buffers(ua, &ua->playback);
1294         if (err < 0)
1295                 goto probe_error;
1296 
1297         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1298         if (err < 0)
1299                 goto probe_error;
1300         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1301         if (err < 0)
1302                 goto probe_error;
1303 
1304         err = snd_pcm_new(card, name, 0, 1, 1, &ua->pcm);
1305         if (err < 0)
1306                 goto probe_error;
1307         ua->pcm->private_data = ua;
1308         strcpy(ua->pcm->name, name);
1309         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1310         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1311 
1312         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1313                                  &ua->midi_list, &midi_quirk);
1314         if (err < 0)
1315                 goto probe_error;
1316 
1317         err = snd_card_register(card);
1318         if (err < 0)
1319                 goto probe_error;
1320 
1321         usb_set_intfdata(interface, ua);
1322         devices_used |= 1 << card_index;
1323 
1324         mutex_unlock(&devices_mutex);
1325         return 0;
1326 
1327 probe_error:
1328         free_usb_related_resources(ua, interface);
1329         snd_card_free(card);
1330         mutex_unlock(&devices_mutex);
1331         return err;
1332 }
1333 
1334 static void ua101_disconnect(struct usb_interface *interface)
1335 {
1336         struct ua101 *ua = usb_get_intfdata(interface);
1337         struct list_head *midi;
1338 
1339         if (!ua)
1340                 return;
1341 
1342         mutex_lock(&devices_mutex);
1343 
1344         set_bit(DISCONNECTED, &ua->states);
1345         wake_up(&ua->rate_feedback_wait);
1346 
1347         /* make sure that userspace cannot create new requests */
1348         snd_card_disconnect(ua->card);
1349 
1350         /* make sure that there are no pending USB requests */
1351         list_for_each(midi, &ua->midi_list)
1352                 snd_usbmidi_disconnect(midi);
1353         abort_alsa_playback(ua);
1354         abort_alsa_capture(ua);
1355         mutex_lock(&ua->mutex);
1356         stop_usb_playback(ua);
1357         stop_usb_capture(ua);
1358         mutex_unlock(&ua->mutex);
1359 
1360         free_usb_related_resources(ua, interface);
1361 
1362         devices_used &= ~(1 << ua->card_index);
1363 
1364         snd_card_free_when_closed(ua->card);
1365 
1366         mutex_unlock(&devices_mutex);
1367 }
1368 
1369 static struct usb_device_id ua101_ids[] = {
1370         { USB_DEVICE(0x0582, 0x0044) }, /* UA-1000 high speed */
1371         { USB_DEVICE(0x0582, 0x007d) }, /* UA-101 high speed */
1372         { USB_DEVICE(0x0582, 0x008d) }, /* UA-101 full speed */
1373         { }
1374 };
1375 MODULE_DEVICE_TABLE(usb, ua101_ids);
1376 
1377 static struct usb_driver ua101_driver = {
1378         .name = "snd-ua101",
1379         .id_table = ua101_ids,
1380         .probe = ua101_probe,
1381         .disconnect = ua101_disconnect,
1382 #if 0
1383         .suspend = ua101_suspend,
1384         .resume = ua101_resume,
1385 #endif
1386 };
1387 
1388 module_usb_driver(ua101_driver);
1389 

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