sound: add Edirol UA-101 support
[linux-2.6.git] / sound / usb / ua101.c
1 /*
2  * Edirol UA-101 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 <linux/vmalloc.h>
23 #include <sound/core.h>
24 #include <sound/initval.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include "usbaudio.h"
28
29 MODULE_DESCRIPTION("Edirol UA-101 driver");
30 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
31 MODULE_LICENSE("GPL v2");
32 MODULE_SUPPORTED_DEVICE("{{Edirol,UA-101}}");
33
34 /* I use my UA-1A for testing because I don't have a UA-101 ... */
35 #define UA1A_HACK
36
37 /*
38  * Should not be lower than the minimum scheduling delay of the host
39  * controller.  Some Intel controllers need more than one frame; as long as
40  * that driver doesn't tell us about this, use 1.5 frames just to be sure.
41  */
42 #define MIN_QUEUE_LENGTH        12
43 /* Somewhat random. */
44 #define MAX_QUEUE_LENGTH        30
45 /*
46  * This magic value optimizes memory usage efficiency for the UA-101's packet
47  * sizes at all sample rates, taking into account the stupid cache pool sizes
48  * that usb_buffer_alloc() uses.
49  */
50 #define DEFAULT_QUEUE_LENGTH    21
51
52 #define MAX_PACKET_SIZE         672 /* hardware specific */
53 #define MAX_MEMORY_BUFFERS      DIV_ROUND_UP(MAX_QUEUE_LENGTH, \
54                                              PAGE_SIZE / MAX_PACKET_SIZE)
55
56 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
57 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
58 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
59 static unsigned int queue_length = 21;
60
61 module_param_array(index, int, NULL, 0444);
62 MODULE_PARM_DESC(index, "card index");
63 module_param_array(id, charp, NULL, 0444);
64 MODULE_PARM_DESC(id, "ID string");
65 module_param_array(enable, bool, NULL, 0444);
66 MODULE_PARM_DESC(enable, "enable card");
67 module_param(queue_length, uint, 0644);
68 MODULE_PARM_DESC(queue_length, "USB queue length in microframes, "
69                  __stringify(MIN_QUEUE_LENGTH)"-"__stringify(MAX_QUEUE_LENGTH));
70
71 enum {
72         INTF_PLAYBACK,
73         INTF_CAPTURE,
74         INTF_MIDI,
75
76         INTF_COUNT
77 };
78
79 /* bits in struct ua101::states */
80 enum {
81         USB_CAPTURE_RUNNING,
82         USB_PLAYBACK_RUNNING,
83         ALSA_CAPTURE_OPEN,
84         ALSA_PLAYBACK_OPEN,
85         ALSA_CAPTURE_RUNNING,
86         ALSA_PLAYBACK_RUNNING,
87         CAPTURE_URB_COMPLETED,
88         PLAYBACK_URB_COMPLETED,
89         DISCONNECTED,
90 };
91
92 struct ua101 {
93         struct usb_device *dev;
94         struct snd_card *card;
95         struct usb_interface *intf[INTF_COUNT];
96         int card_index;
97         struct snd_pcm *pcm;
98         struct list_head midi_list;
99         u64 format_bit;
100         unsigned int rate;
101         unsigned int packets_per_second;
102         spinlock_t lock;
103         struct mutex mutex;
104         unsigned long states;
105
106         /* FIFO to synchronize playback rate to capture rate */
107         unsigned int rate_feedback_start;
108         unsigned int rate_feedback_count;
109         u8 rate_feedback[MAX_QUEUE_LENGTH];
110
111         struct list_head ready_playback_urbs;
112         struct tasklet_struct playback_tasklet;
113         wait_queue_head_t alsa_capture_wait;
114         wait_queue_head_t rate_feedback_wait;
115         wait_queue_head_t alsa_playback_wait;
116         struct ua101_stream {
117                 struct snd_pcm_substream *substream;
118                 unsigned int usb_pipe;
119                 unsigned int channels;
120                 unsigned int frame_bytes;
121                 unsigned int max_packet_bytes;
122                 unsigned int period_pos;
123                 unsigned int buffer_pos;
124                 unsigned int queue_length;
125                 struct ua101_urb {
126                         struct urb urb;
127                         struct usb_iso_packet_descriptor iso_frame_desc[1];
128                         struct list_head ready_list;
129                 } *urbs[MAX_QUEUE_LENGTH];
130                 struct {
131                         unsigned int size;
132                         void *addr;
133                         dma_addr_t dma;
134                 } buffers[MAX_MEMORY_BUFFERS];
135         } capture, playback;
136
137         unsigned int fps[10];
138         unsigned int frame_counter;
139 };
140
141 static DEFINE_MUTEX(devices_mutex);
142 static unsigned int devices_used;
143 static struct usb_driver ua101_driver;
144
145 static void abort_alsa_playback(struct ua101 *ua);
146 static void abort_alsa_capture(struct ua101 *ua);
147
148 /* allocate virtual buffer; may be called more than once */
149 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
150                                         size_t size)
151 {
152         struct snd_pcm_runtime *runtime = subs->runtime;
153
154         if (runtime->dma_area) {
155                 if (runtime->dma_bytes >= size)
156                         return 0; /* already large enough */
157                 vfree(runtime->dma_area);
158         }
159         runtime->dma_area = vmalloc_user(size);
160         if (!runtime->dma_area)
161                 return -ENOMEM;
162         runtime->dma_bytes = size;
163         return 0;
164 }
165
166 /* free virtual buffer; may be called more than once */
167 static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
168 {
169         struct snd_pcm_runtime *runtime = subs->runtime;
170
171         vfree(runtime->dma_area);
172         runtime->dma_area = NULL;
173         return 0;
174 }
175
176 /* get the physical page pointer at the given offset */
177 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
178                                              unsigned long offset)
179 {
180         void *pageptr = subs->runtime->dma_area + offset;
181         return vmalloc_to_page(pageptr);
182 }
183
184 static const char *usb_error_string(int err)
185 {
186         switch (err) {
187         case -ENODEV:
188                 return "no device";
189         case -ENOENT:
190                 return "endpoint not enabled";
191         case -EPIPE:
192                 return "endpoint stalled";
193         case -ENOSPC:
194                 return "not enough bandwidth";
195         case -ESHUTDOWN:
196                 return "device disabled";
197         case -EHOSTUNREACH:
198                 return "device suspended";
199         case -EINVAL:
200         case -EAGAIN:
201         case -EFBIG:
202         case -EMSGSIZE:
203                 return "internal error";
204         default:
205                 return "unknown error";
206         }
207 }
208
209 static void abort_usb_capture(struct ua101 *ua)
210 {
211         if (test_and_clear_bit(USB_CAPTURE_RUNNING, &ua->states)) {
212                 wake_up(&ua->alsa_capture_wait);
213                 wake_up(&ua->rate_feedback_wait);
214         }
215 }
216
217 static void abort_usb_playback(struct ua101 *ua)
218 {
219         if (test_and_clear_bit(USB_PLAYBACK_RUNNING, &ua->states))
220                 wake_up(&ua->alsa_playback_wait);
221 }
222
223 static void playback_urb_complete(struct urb *usb_urb)
224 {
225         struct ua101_urb *urb = (struct ua101_urb *)usb_urb;
226         struct ua101 *ua = urb->urb.context;
227         unsigned long flags;
228
229         if (unlikely(urb->urb.status == -ENOENT ||      /* unlinked */
230                      urb->urb.status == -ENODEV ||      /* device removed */
231                      urb->urb.status == -ECONNRESET ||  /* unlinked */
232                      urb->urb.status == -ESHUTDOWN)) {  /* device disabled */
233                 abort_usb_playback(ua);
234                 abort_alsa_playback(ua);
235                 return;
236         }
237
238         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states)) {
239                 /* append URB to FIFO */
240                 spin_lock_irqsave(&ua->lock, flags);
241                 list_add_tail(&urb->ready_list, &ua->ready_playback_urbs);
242                 if (ua->rate_feedback_count > 0)
243                         tasklet_schedule(&ua->playback_tasklet);
244                 ua->playback.substream->runtime->delay -=
245                                 urb->urb.iso_frame_desc[0].length /
246                                                 ua->playback.frame_bytes;
247                 spin_unlock_irqrestore(&ua->lock, flags);
248         }
249 }
250
251 static void first_playback_urb_complete(struct urb *urb)
252 {
253         struct ua101 *ua = urb->context;
254
255         urb->complete = playback_urb_complete;
256         playback_urb_complete(urb);
257
258         set_bit(PLAYBACK_URB_COMPLETED, &ua->states);
259         wake_up(&ua->alsa_playback_wait);
260 }
261
262 /* copy data from the ALSA ring buffer into the URB buffer */
263 static bool copy_playback_data(struct ua101_stream *stream, struct urb *urb,
264                                unsigned int frames)
265 {
266         struct snd_pcm_runtime *runtime;
267         unsigned int frame_bytes, frames1;
268         const u8 *source;
269
270         runtime = stream->substream->runtime;
271         frame_bytes = stream->frame_bytes;
272         source = runtime->dma_area + stream->buffer_pos * frame_bytes;
273         if (stream->buffer_pos + frames <= runtime->buffer_size) {
274                 memcpy(urb->transfer_buffer, source, frames * frame_bytes);
275         } else {
276                 /* wrap around at end of ring buffer */
277                 frames1 = runtime->buffer_size - stream->buffer_pos;
278                 memcpy(urb->transfer_buffer, source, frames1 * frame_bytes);
279                 memcpy(urb->transfer_buffer + frames1 * frame_bytes,
280                        runtime->dma_area, (frames - frames1) * frame_bytes);
281         }
282
283         stream->buffer_pos += frames;
284         if (stream->buffer_pos >= runtime->buffer_size)
285                 stream->buffer_pos -= runtime->buffer_size;
286         stream->period_pos += frames;
287         if (stream->period_pos >= runtime->period_size) {
288                 stream->period_pos -= runtime->period_size;
289                 return true;
290         }
291         return false;
292 }
293
294 static inline void add_with_wraparound(struct ua101 *ua,
295                                        unsigned int *value, unsigned int add)
296 {
297         *value += add;
298         if (*value >= ua->playback.queue_length)
299                 *value -= ua->playback.queue_length;
300 }
301
302 static void playback_tasklet(unsigned long data)
303 {
304         struct ua101 *ua = (void *)data;
305         unsigned long flags;
306         unsigned int frames;
307         struct ua101_urb *urb;
308         bool do_period_elapsed = false;
309         int err;
310
311         if (unlikely(!test_bit(USB_PLAYBACK_RUNNING, &ua->states)))
312                 return;
313
314         /*
315          * Synchronizing the playback rate to the capture rate is done by using
316          * the same sequence of packet sizes for both streams.
317          * Submitting a playback URB therefore requires both a ready URB and
318          * the size of the corresponding capture packet, i.e., both playback
319          * and capture URBs must have been completed.  Since the USB core does
320          * not guarantee that playback and capture complete callbacks are
321          * called alternately, we use two FIFOs for packet sizes and read URBs;
322          * submitting playback URBs is possible as long as both FIFOs are
323          * nonempty.
324          */
325         spin_lock_irqsave(&ua->lock, flags);
326         while (ua->rate_feedback_count > 0 &&
327                !list_empty(&ua->ready_playback_urbs)) {
328                 /* take packet size out of FIFO */
329                 frames = ua->rate_feedback[ua->rate_feedback_start];
330                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
331                 ua->rate_feedback_count--;
332
333                 /* take URB out of FIFO */
334                 urb = list_first_entry(&ua->ready_playback_urbs,
335                                        struct ua101_urb, ready_list);
336                 list_del(&urb->ready_list);
337
338                 /* fill packet with data or silence */
339                 urb->urb.iso_frame_desc[0].length =
340                         frames * ua->playback.frame_bytes;
341                 if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
342                         do_period_elapsed |= copy_playback_data(&ua->playback,
343                                                                 &urb->urb,
344                                                                 frames);
345                 else
346                         memset(urb->urb.transfer_buffer, 0,
347                                urb->urb.iso_frame_desc[0].length);
348
349                 /* and off you go ... */
350                 err = usb_submit_urb(&urb->urb, GFP_ATOMIC);
351                 if (unlikely(err < 0)) {
352                         spin_unlock_irqrestore(&ua->lock, flags);
353                         abort_usb_playback(ua);
354                         abort_alsa_playback(ua);
355                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
356                                 err, usb_error_string(err));
357                         return;
358                 }
359                 ua->playback.substream->runtime->delay += frames;
360         }
361         spin_unlock_irqrestore(&ua->lock, flags);
362         if (do_period_elapsed)
363                 snd_pcm_period_elapsed(ua->playback.substream);
364 }
365
366 /* copy data from the URB buffer into the ALSA ring buffer */
367 static bool copy_capture_data(struct ua101_stream *stream, struct urb *urb,
368                               unsigned int frames)
369 {
370         struct snd_pcm_runtime *runtime;
371         unsigned int frame_bytes, frames1;
372         u8 *dest;
373
374         runtime = stream->substream->runtime;
375         frame_bytes = stream->frame_bytes;
376         dest = runtime->dma_area + stream->buffer_pos * frame_bytes;
377         if (stream->buffer_pos + frames <= runtime->buffer_size) {
378                 memcpy(dest, urb->transfer_buffer, frames * frame_bytes);
379         } else {
380                 /* wrap around at end of ring buffer */
381                 frames1 = runtime->buffer_size - stream->buffer_pos;
382                 memcpy(dest, urb->transfer_buffer, frames1 * frame_bytes);
383                 memcpy(runtime->dma_area,
384                        urb->transfer_buffer + frames1 * frame_bytes,
385                        (frames - frames1) * frame_bytes);
386         }
387
388         stream->buffer_pos += frames;
389         if (stream->buffer_pos >= runtime->buffer_size)
390                 stream->buffer_pos -= runtime->buffer_size;
391         stream->period_pos += frames;
392         if (stream->period_pos >= runtime->period_size) {
393                 stream->period_pos -= runtime->period_size;
394                 return true;
395         }
396         return false;
397 }
398
399 static void capture_urb_complete(struct urb *urb)
400 {
401         struct ua101 *ua = urb->context;
402         struct ua101_stream *stream = &ua->capture;
403         unsigned long flags;
404         unsigned int frames, write_ptr;
405         bool do_period_elapsed;
406         int err;
407
408         if (unlikely(urb->status == -ENOENT ||          /* unlinked */
409                      urb->status == -ENODEV ||          /* device removed */
410                      urb->status == -ECONNRESET ||      /* unlinked */
411                      urb->status == -ESHUTDOWN))        /* device disabled */
412                 goto stream_stopped;
413
414         if (urb->status >= 0 && urb->iso_frame_desc[0].status >= 0)
415                 frames = urb->iso_frame_desc[0].actual_length /
416                         stream->frame_bytes;
417         else
418                 frames = 0;
419
420         spin_lock_irqsave(&ua->lock, flags);
421
422         if (frames > 0 && test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
423                 do_period_elapsed = copy_capture_data(stream, urb, frames);
424         else
425                 do_period_elapsed = false;
426
427         if (test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
428                 err = usb_submit_urb(urb, GFP_ATOMIC);
429                 if (unlikely(err < 0)) {
430                         spin_unlock_irqrestore(&ua->lock, flags);
431                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
432                                 err, usb_error_string(err));
433                         goto stream_stopped;
434                 }
435
436                 /* append packet size to FIFO */
437                 write_ptr = ua->rate_feedback_start;
438                 add_with_wraparound(ua, &write_ptr, ua->rate_feedback_count);
439                 ua->rate_feedback[write_ptr] = frames;
440                 if (ua->rate_feedback_count < ua->playback.queue_length) {
441                         ua->rate_feedback_count++;
442                         if (ua->rate_feedback_count ==
443                                                 ua->playback.queue_length)
444                                 wake_up(&ua->rate_feedback_wait);
445                 } else {
446                         /*
447                          * Ring buffer overflow; this happens when the playback
448                          * stream is not running.  Throw away the oldest entry,
449                          * so that the playback stream, when it starts, sees
450                          * the most recent packet sizes.
451                          */
452                         add_with_wraparound(ua, &ua->rate_feedback_start, 1);
453                 }
454                 if (test_bit(USB_PLAYBACK_RUNNING, &ua->states) &&
455                     !list_empty(&ua->ready_playback_urbs))
456                         tasklet_schedule(&ua->playback_tasklet);
457         }
458
459         spin_unlock_irqrestore(&ua->lock, flags);
460
461         if (do_period_elapsed)
462                 snd_pcm_period_elapsed(stream->substream);
463
464         /* for debugging: measure the sample rate relative to the USB clock */
465         ua->fps[ua->frame_counter++ / ua->packets_per_second] += frames;
466         if (ua->frame_counter >= ARRAY_SIZE(ua->fps) * ua->packets_per_second) {
467                 printk(KERN_DEBUG "capture rate:");
468                 for (frames = 0; frames < ARRAY_SIZE(ua->fps); ++frames)
469                         printk(KERN_CONT " %u", ua->fps[frames]);
470                 printk(KERN_CONT "\n");
471                 memset(ua->fps, 0, sizeof(ua->fps));
472                 ua->frame_counter = 0;
473         }
474         return;
475
476 stream_stopped:
477         abort_usb_playback(ua);
478         abort_usb_capture(ua);
479         abort_alsa_playback(ua);
480         abort_alsa_capture(ua);
481 }
482
483 static void first_capture_urb_complete(struct urb *urb)
484 {
485         struct ua101 *ua = urb->context;
486
487         urb->complete = capture_urb_complete;
488         capture_urb_complete(urb);
489
490         set_bit(CAPTURE_URB_COMPLETED, &ua->states);
491         wake_up(&ua->alsa_capture_wait);
492 }
493
494 static int submit_stream_urbs(struct ua101 *ua, struct ua101_stream *stream)
495 {
496         unsigned int i;
497
498         for (i = 0; i < stream->queue_length; ++i) {
499                 int err = usb_submit_urb(&stream->urbs[i]->urb, GFP_KERNEL);
500                 if (err < 0) {
501                         dev_err(&ua->dev->dev, "USB request error %d: %s\n",
502                                 err, usb_error_string(err));
503                         return err;
504                 }
505         }
506         return 0;
507 }
508
509 static void kill_stream_urbs(struct ua101_stream *stream)
510 {
511         unsigned int i;
512
513         for (i = 0; i < stream->queue_length; ++i)
514                 usb_kill_urb(&stream->urbs[i]->urb);
515 }
516
517 static int enable_iso_interface(struct ua101 *ua, unsigned int intf_index)
518 {
519         struct usb_host_interface *alts;
520
521         alts = ua->intf[intf_index]->cur_altsetting;
522         if (alts->desc.bAlternateSetting != 1) {
523                 int err = usb_set_interface(ua->dev,
524                                             alts->desc.bInterfaceNumber, 1);
525                 if (err < 0) {
526                         dev_err(&ua->dev->dev,
527                                 "cannot initialize interface; error %d: %s\n",
528                                 err, usb_error_string(err));
529                         return err;
530                 }
531         }
532         return 0;
533 }
534
535 static void disable_iso_interface(struct ua101 *ua, unsigned int intf_index)
536 {
537         struct usb_host_interface *alts;
538
539         alts = ua->intf[intf_index]->cur_altsetting;
540         if (alts->desc.bAlternateSetting != 0) {
541                 int err = usb_set_interface(ua->dev,
542                                             alts->desc.bInterfaceNumber, 0);
543                 if (err < 0 && !test_bit(DISCONNECTED, &ua->states))
544                         dev_warn(&ua->dev->dev,
545                                  "interface reset failed; error %d: %s\n",
546                                  err, usb_error_string(err));
547         }
548 }
549
550 static void stop_usb_capture(struct ua101 *ua)
551 {
552         clear_bit(USB_CAPTURE_RUNNING, &ua->states);
553
554         kill_stream_urbs(&ua->capture);
555
556         disable_iso_interface(ua, INTF_CAPTURE);
557 }
558
559 static int start_usb_capture(struct ua101 *ua)
560 {
561         int err;
562
563         if (test_bit(DISCONNECTED, &ua->states))
564                 return -ENODEV;
565
566         if (test_bit(USB_CAPTURE_RUNNING, &ua->states))
567                 return 0;
568
569         kill_stream_urbs(&ua->capture);
570
571         err = enable_iso_interface(ua, INTF_CAPTURE);
572         if (err < 0)
573                 return err;
574
575         clear_bit(CAPTURE_URB_COMPLETED, &ua->states);
576         ua->capture.urbs[0]->urb.complete = first_capture_urb_complete;
577         ua->rate_feedback_start = 0;
578         ua->rate_feedback_count = 0;
579
580         set_bit(USB_CAPTURE_RUNNING, &ua->states);
581         err = submit_stream_urbs(ua, &ua->capture);
582         if (err < 0)
583                 stop_usb_capture(ua);
584         return err;
585 }
586
587 static void stop_usb_playback(struct ua101 *ua)
588 {
589         clear_bit(USB_PLAYBACK_RUNNING, &ua->states);
590
591         kill_stream_urbs(&ua->playback);
592
593         tasklet_kill(&ua->playback_tasklet);
594
595         disable_iso_interface(ua, INTF_PLAYBACK);
596 }
597
598 static int start_usb_playback(struct ua101 *ua)
599 {
600         unsigned int i, frames;
601         struct urb *urb;
602         int err = 0;
603
604         if (test_bit(DISCONNECTED, &ua->states))
605                 return -ENODEV;
606
607         if (test_bit(USB_PLAYBACK_RUNNING, &ua->states))
608                 return 0;
609
610         kill_stream_urbs(&ua->playback);
611         tasklet_kill(&ua->playback_tasklet);
612
613         err = enable_iso_interface(ua, INTF_PLAYBACK);
614         if (err < 0)
615                 return err;
616
617         clear_bit(PLAYBACK_URB_COMPLETED, &ua->states);
618         ua->playback.urbs[0]->urb.complete =
619                 first_playback_urb_complete;
620         spin_lock_irq(&ua->lock);
621         INIT_LIST_HEAD(&ua->ready_playback_urbs);
622         spin_unlock_irq(&ua->lock);
623
624         /*
625          * We submit the initial URBs all at once, so we have to wait for the
626          * packet size FIFO to be full.
627          */
628         wait_event(ua->rate_feedback_wait,
629                    ua->rate_feedback_count >= ua->playback.queue_length ||
630                    !test_bit(USB_CAPTURE_RUNNING, &ua->states) ||
631                    test_bit(DISCONNECTED, &ua->states));
632         if (test_bit(DISCONNECTED, &ua->states)) {
633                 stop_usb_playback(ua);
634                 return -ENODEV;
635         }
636         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states)) {
637                 stop_usb_playback(ua);
638                 return -EIO;
639         }
640
641         for (i = 0; i < ua->playback.queue_length; ++i) {
642                 /* all initial URBs contain silence */
643                 spin_lock_irq(&ua->lock);
644                 frames = ua->rate_feedback[ua->rate_feedback_start];
645                 add_with_wraparound(ua, &ua->rate_feedback_start, 1);
646                 ua->rate_feedback_count--;
647                 spin_unlock_irq(&ua->lock);
648                 urb = &ua->playback.urbs[i]->urb;
649                 urb->iso_frame_desc[0].length =
650                         frames * ua->playback.frame_bytes;
651                 memset(urb->transfer_buffer, 0,
652                        urb->iso_frame_desc[0].length);
653         }
654
655         set_bit(USB_PLAYBACK_RUNNING, &ua->states);
656         err = submit_stream_urbs(ua, &ua->playback);
657         if (err < 0)
658                 stop_usb_playback(ua);
659         return err;
660 }
661
662 static void abort_alsa_capture(struct ua101 *ua)
663 {
664         if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
665                 snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
666 }
667
668 static void abort_alsa_playback(struct ua101 *ua)
669 {
670         if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
671                 snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
672 }
673
674 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
675                          unsigned int channels)
676 {
677         int err;
678
679         substream->runtime->hw.info =
680                 SNDRV_PCM_INFO_MMAP |
681                 SNDRV_PCM_INFO_MMAP_VALID |
682                 SNDRV_PCM_INFO_BATCH |
683                 SNDRV_PCM_INFO_INTERLEAVED |
684                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
685                 SNDRV_PCM_INFO_FIFO_IN_FRAMES;
686         substream->runtime->hw.formats = ua->format_bit;
687         substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
688         substream->runtime->hw.rate_min = ua->rate;
689         substream->runtime->hw.rate_max = ua->rate;
690         substream->runtime->hw.channels_min = channels;
691         substream->runtime->hw.channels_max = channels;
692         substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
693         substream->runtime->hw.period_bytes_min = 1;
694         substream->runtime->hw.period_bytes_max = UINT_MAX;
695         substream->runtime->hw.periods_min = 2;
696         substream->runtime->hw.periods_max = UINT_MAX;
697         err = snd_pcm_hw_constraint_minmax(substream->runtime,
698                                            SNDRV_PCM_HW_PARAM_PERIOD_TIME,
699                                            1500000 / ua->packets_per_second,
700                                            8192000);
701         if (err < 0)
702                 return err;
703         err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
704         return err;
705 }
706
707 static int capture_pcm_open(struct snd_pcm_substream *substream)
708 {
709         struct ua101 *ua = substream->private_data;
710         int err;
711
712         ua->capture.substream = substream;
713         err = set_stream_hw(ua, substream, ua->capture.channels);
714         if (err < 0)
715                 return err;
716         substream->runtime->hw.fifo_size =
717                 DIV_ROUND_CLOSEST(ua->rate, ua->packets_per_second);
718         substream->runtime->delay = substream->runtime->hw.fifo_size;
719
720         mutex_lock(&ua->mutex);
721         err = start_usb_capture(ua);
722         if (err >= 0)
723                 set_bit(ALSA_CAPTURE_OPEN, &ua->states);
724         mutex_unlock(&ua->mutex);
725         return err;
726 }
727
728 static int playback_pcm_open(struct snd_pcm_substream *substream)
729 {
730         struct ua101 *ua = substream->private_data;
731         int err;
732
733         ua->playback.substream = substream;
734         err = set_stream_hw(ua, substream, ua->playback.channels);
735         if (err < 0)
736                 return err;
737         substream->runtime->hw.fifo_size =
738                 DIV_ROUND_CLOSEST(ua->rate * ua->playback.queue_length,
739                                   ua->packets_per_second);
740
741         mutex_lock(&ua->mutex);
742         err = start_usb_capture(ua);
743         if (err < 0)
744                 goto error;
745         err = start_usb_playback(ua);
746         if (err < 0) {
747                 if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
748                         stop_usb_capture(ua);
749                 goto error;
750         }
751         set_bit(ALSA_PLAYBACK_OPEN, &ua->states);
752 error:
753         mutex_unlock(&ua->mutex);
754         return err;
755 }
756
757 static int capture_pcm_close(struct snd_pcm_substream *substream)
758 {
759         struct ua101 *ua = substream->private_data;
760
761         mutex_lock(&ua->mutex);
762         clear_bit(ALSA_CAPTURE_OPEN, &ua->states);
763         if (!test_bit(ALSA_PLAYBACK_OPEN, &ua->states))
764                 stop_usb_capture(ua);
765         mutex_unlock(&ua->mutex);
766         return 0;
767 }
768
769 static int playback_pcm_close(struct snd_pcm_substream *substream)
770 {
771         struct ua101 *ua = substream->private_data;
772
773         mutex_lock(&ua->mutex);
774         stop_usb_playback(ua);
775         clear_bit(ALSA_PLAYBACK_OPEN, &ua->states);
776         if (!test_bit(ALSA_CAPTURE_OPEN, &ua->states))
777                 stop_usb_capture(ua);
778         mutex_unlock(&ua->mutex);
779         return 0;
780 }
781
782 static int capture_pcm_hw_params(struct snd_pcm_substream *substream,
783                                  struct snd_pcm_hw_params *hw_params)
784 {
785         struct ua101 *ua = substream->private_data;
786         int err;
787
788         mutex_lock(&ua->mutex);
789         err = start_usb_capture(ua);
790         mutex_unlock(&ua->mutex);
791         if (err < 0)
792                 return err;
793
794         return snd_pcm_alloc_vmalloc_buffer(substream,
795                                             params_buffer_bytes(hw_params));
796 }
797
798 static int playback_pcm_hw_params(struct snd_pcm_substream *substream,
799                                   struct snd_pcm_hw_params *hw_params)
800 {
801         struct ua101 *ua = substream->private_data;
802         int err;
803
804         mutex_lock(&ua->mutex);
805         err = start_usb_capture(ua);
806         if (err >= 0)
807                 err = start_usb_playback(ua);
808         mutex_unlock(&ua->mutex);
809         if (err < 0)
810                 return err;
811
812         return snd_pcm_alloc_vmalloc_buffer(substream,
813                                             params_buffer_bytes(hw_params));
814 }
815
816 static int ua101_pcm_hw_free(struct snd_pcm_substream *substream)
817 {
818         snd_pcm_free_vmalloc_buffer(substream);
819         return 0;
820 }
821
822 static int capture_pcm_prepare(struct snd_pcm_substream *substream)
823 {
824         struct ua101 *ua = substream->private_data;
825         int err;
826
827         mutex_lock(&ua->mutex);
828         err = start_usb_capture(ua);
829         mutex_unlock(&ua->mutex);
830         if (err < 0)
831                 return err;
832
833         /*
834          * The EHCI driver schedules the first packet of an iso stream at 10 ms
835          * in the future, i.e., no data is actually captured for that long.
836          * Take the wait here so that the stream is known to be actually
837          * running when the start trigger has been called.
838          */
839         wait_event(ua->alsa_capture_wait,
840                    test_bit(CAPTURE_URB_COMPLETED, &ua->states) ||
841                    !test_bit(USB_CAPTURE_RUNNING, &ua->states));
842         if (test_bit(DISCONNECTED, &ua->states))
843                 return -ENODEV;
844         if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
845                 return -EIO;
846
847         ua->capture.period_pos = 0;
848         ua->capture.buffer_pos = 0;
849         return 0;
850 }
851
852 static int playback_pcm_prepare(struct snd_pcm_substream *substream)
853 {
854         struct ua101 *ua = substream->private_data;
855         int err;
856
857         mutex_lock(&ua->mutex);
858         err = start_usb_capture(ua);
859         if (err >= 0)
860                 err = start_usb_playback(ua);
861         mutex_unlock(&ua->mutex);
862         if (err < 0)
863                 return err;
864
865         /* see the comment in capture_pcm_prepare() */
866         wait_event(ua->alsa_playback_wait,
867                    test_bit(PLAYBACK_URB_COMPLETED, &ua->states) ||
868                    !test_bit(USB_PLAYBACK_RUNNING, &ua->states));
869         if (test_bit(DISCONNECTED, &ua->states))
870                 return -ENODEV;
871         if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
872                 return -EIO;
873
874         substream->runtime->delay = 0;
875         ua->playback.period_pos = 0;
876         ua->playback.buffer_pos = 0;
877         return 0;
878 }
879
880 static int capture_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
881 {
882         struct ua101 *ua = substream->private_data;
883
884         switch (cmd) {
885         case SNDRV_PCM_TRIGGER_START:
886                 if (!test_bit(USB_CAPTURE_RUNNING, &ua->states))
887                         return -EIO;
888                 set_bit(ALSA_CAPTURE_RUNNING, &ua->states);
889                 return 0;
890         case SNDRV_PCM_TRIGGER_STOP:
891                 clear_bit(ALSA_CAPTURE_RUNNING, &ua->states);
892                 return 0;
893         default:
894                 return -EINVAL;
895         }
896 }
897
898 static int playback_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
899 {
900         struct ua101 *ua = substream->private_data;
901
902         switch (cmd) {
903         case SNDRV_PCM_TRIGGER_START:
904                 if (!test_bit(USB_PLAYBACK_RUNNING, &ua->states))
905                         return -EIO;
906                 set_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
907                 return 0;
908         case SNDRV_PCM_TRIGGER_STOP:
909                 clear_bit(ALSA_PLAYBACK_RUNNING, &ua->states);
910                 return 0;
911         default:
912                 return -EINVAL;
913         }
914 }
915
916 static inline snd_pcm_uframes_t ua101_pcm_pointer(struct ua101 *ua,
917                                                   struct ua101_stream *stream)
918 {
919         unsigned long flags;
920         unsigned int pos;
921
922         spin_lock_irqsave(&ua->lock, flags);
923         pos = stream->buffer_pos;
924         spin_unlock_irqrestore(&ua->lock, flags);
925         return pos;
926 }
927
928 static snd_pcm_uframes_t capture_pcm_pointer(struct snd_pcm_substream *subs)
929 {
930         struct ua101 *ua = subs->private_data;
931
932         return ua101_pcm_pointer(ua, &ua->capture);
933 }
934
935 static snd_pcm_uframes_t playback_pcm_pointer(struct snd_pcm_substream *subs)
936 {
937         struct ua101 *ua = subs->private_data;
938
939         return ua101_pcm_pointer(ua, &ua->playback);
940 }
941
942 static struct snd_pcm_ops capture_pcm_ops = {
943         .open = capture_pcm_open,
944         .close = capture_pcm_close,
945         .ioctl = snd_pcm_lib_ioctl,
946         .hw_params = capture_pcm_hw_params,
947         .hw_free = ua101_pcm_hw_free,
948         .prepare = capture_pcm_prepare,
949         .trigger = capture_pcm_trigger,
950         .pointer = capture_pcm_pointer,
951         .page = snd_pcm_get_vmalloc_page,
952 };
953
954 static struct snd_pcm_ops playback_pcm_ops = {
955         .open = playback_pcm_open,
956         .close = playback_pcm_close,
957         .ioctl = snd_pcm_lib_ioctl,
958         .hw_params = playback_pcm_hw_params,
959         .hw_free = ua101_pcm_hw_free,
960         .prepare = playback_pcm_prepare,
961         .trigger = playback_pcm_trigger,
962         .pointer = playback_pcm_pointer,
963         .page = snd_pcm_get_vmalloc_page,
964 };
965
966 static const struct uac_format_type_i_discrete_descriptor *
967 find_format_descriptor(struct usb_interface *interface)
968 {
969         struct usb_host_interface *alt;
970         u8 *extra;
971         int extralen;
972
973         if (interface->num_altsetting != 2) {
974                 dev_err(&interface->dev, "invalid num_altsetting\n");
975                 return NULL;
976         }
977
978         alt = &interface->altsetting[0];
979         if (alt->desc.bNumEndpoints != 0) {
980                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
981                 return NULL;
982         }
983
984         alt = &interface->altsetting[1];
985         if (alt->desc.bNumEndpoints != 1) {
986                 dev_err(&interface->dev, "invalid bNumEndpoints\n");
987                 return NULL;
988         }
989
990         extra = alt->extra;
991         extralen = alt->extralen;
992         while (extralen >= sizeof(struct usb_descriptor_header)) {
993                 struct uac_format_type_i_discrete_descriptor *desc;
994
995                 desc = (struct uac_format_type_i_discrete_descriptor *)extra;
996                 if (desc->bLength > extralen) {
997                         dev_err(&interface->dev, "descriptor overflow\n");
998                         return NULL;
999                 }
1000                 if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&
1001                     desc->bDescriptorType == USB_DT_CS_INTERFACE &&
1002                     desc->bDescriptorSubtype == UAC_FORMAT_TYPE) {
1003                         if (desc->bFormatType != UAC_FORMAT_TYPE_I_PCM ||
1004                             desc->bSamFreqType != 1) {
1005                                 dev_err(&interface->dev,
1006                                         "invalid format type\n");
1007                                 return NULL;
1008                         }
1009                         return desc;
1010                 }
1011                 extralen -= desc->bLength;
1012                 extra += desc->bLength;
1013         }
1014         dev_err(&interface->dev, "sample format descriptor not found\n");
1015         return NULL;
1016 }
1017
1018 static int detect_usb_format(struct ua101 *ua)
1019 {
1020         const struct uac_format_type_i_discrete_descriptor *fmt_capture;
1021         const struct uac_format_type_i_discrete_descriptor *fmt_playback;
1022         const struct usb_endpoint_descriptor *epd;
1023         unsigned int rate2;
1024
1025         fmt_capture = find_format_descriptor(ua->intf[INTF_CAPTURE]);
1026         fmt_playback = find_format_descriptor(ua->intf[INTF_PLAYBACK]);
1027         if (!fmt_capture || !fmt_playback)
1028                 return -ENXIO;
1029
1030         switch (fmt_capture->bSubframeSize) {
1031         case 3:
1032                 ua->format_bit = SNDRV_PCM_FMTBIT_S24_3LE;
1033                 break;
1034         case 4:
1035                 ua->format_bit = SNDRV_PCM_FMTBIT_S32_LE;
1036                 break;
1037         default:
1038                 dev_err(&ua->dev->dev, "sample width is not 24 or 32 bits\n");
1039                 return -ENXIO;
1040         }
1041         if (fmt_capture->bSubframeSize != fmt_playback->bSubframeSize) {
1042                 dev_err(&ua->dev->dev,
1043                         "playback/capture sample widths do not match\n");
1044                 return -ENXIO;
1045         }
1046
1047         if (fmt_capture->bBitResolution != 24 ||
1048             fmt_playback->bBitResolution != 24) {
1049                 dev_err(&ua->dev->dev, "sample width is not 24 bits\n");
1050                 return -ENXIO;
1051         }
1052
1053         ua->rate = combine_triple(fmt_capture->tSamFreq[0]);
1054         rate2 = combine_triple(fmt_playback->tSamFreq[0]);
1055         if (ua->rate != rate2) {
1056                 dev_err(&ua->dev->dev,
1057                         "playback/capture rates do not match: %u/%u\n",
1058                         rate2, ua->rate);
1059                 return -ENXIO;
1060         }
1061
1062         switch (ua->dev->speed) {
1063         case USB_SPEED_FULL:
1064                 ua->packets_per_second = 1000;
1065                 break;
1066         case USB_SPEED_HIGH:
1067                 ua->packets_per_second = 8000;
1068                 break;
1069         default:
1070                 dev_err(&ua->dev->dev, "unknown device speed\n");
1071                 return -ENXIO;
1072         }
1073
1074         ua->capture.channels = fmt_capture->bNrChannels;
1075         ua->playback.channels = fmt_playback->bNrChannels;
1076         ua->capture.frame_bytes =
1077                 fmt_capture->bSubframeSize * ua->capture.channels;
1078         ua->playback.frame_bytes =
1079                 fmt_playback->bSubframeSize * ua->playback.channels;
1080
1081         epd = &ua->intf[INTF_CAPTURE]->altsetting[1].endpoint[0].desc;
1082         if (!usb_endpoint_is_isoc_in(epd)) {
1083                 dev_err(&ua->dev->dev, "invalid capture endpoint\n");
1084                 return -ENXIO;
1085         }
1086         ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, usb_endpoint_num(epd));
1087         ua->capture.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1088
1089         epd = &ua->intf[INTF_PLAYBACK]->altsetting[1].endpoint[0].desc;
1090         if (!usb_endpoint_is_isoc_out(epd)) {
1091                 dev_err(&ua->dev->dev, "invalid playback endpoint\n");
1092                 return -ENXIO;
1093         }
1094         ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, usb_endpoint_num(epd));
1095         ua->playback.max_packet_bytes = le16_to_cpu(epd->wMaxPacketSize);
1096         return 0;
1097 }
1098
1099 static int alloc_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1100 {
1101         unsigned int remaining_packets, packets, packets_per_page, i;
1102         size_t size;
1103
1104         stream->queue_length = queue_length;
1105         stream->queue_length = max(stream->queue_length,
1106                                    (unsigned int)MIN_QUEUE_LENGTH);
1107         stream->queue_length = min(stream->queue_length,
1108                                    (unsigned int)MAX_QUEUE_LENGTH);
1109
1110         /*
1111          * The cache pool sizes used by usb_buffer_alloc() (128, 512, 2048) are
1112          * quite bad when used with the packet sizes of this device (e.g. 280,
1113          * 520, 624).  Therefore, we allocate and subdivide entire pages, using
1114          * a smaller buffer only for the last chunk.
1115          */
1116         remaining_packets = stream->queue_length;
1117         packets_per_page = PAGE_SIZE / stream->max_packet_bytes;
1118         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i) {
1119                 packets = min(remaining_packets, packets_per_page);
1120                 size = packets * stream->max_packet_bytes;
1121                 stream->buffers[i].addr =
1122                         usb_buffer_alloc(ua->dev, size, GFP_KERNEL,
1123                                          &stream->buffers[i].dma);
1124                 if (!stream->buffers[i].addr)
1125                         return -ENOMEM;
1126                 stream->buffers[i].size = size;
1127                 remaining_packets -= packets;
1128                 if (!remaining_packets)
1129                         break;
1130         }
1131         if (remaining_packets) {
1132                 dev_err(&ua->dev->dev, "too many packets\n");
1133                 return -ENXIO;
1134         }
1135         return 0;
1136 }
1137
1138 static void free_stream_buffers(struct ua101 *ua, struct ua101_stream *stream)
1139 {
1140         unsigned int i;
1141
1142         for (i = 0; i < ARRAY_SIZE(stream->buffers); ++i)
1143                 usb_buffer_free(ua->dev,
1144                                 stream->buffers[i].size,
1145                                 stream->buffers[i].addr,
1146                                 stream->buffers[i].dma);
1147 }
1148
1149 static int alloc_stream_urbs(struct ua101 *ua, struct ua101_stream *stream,
1150                              void (*urb_complete)(struct urb *))
1151 {
1152         unsigned max_packet_size = stream->max_packet_bytes;
1153         struct ua101_urb *urb;
1154         unsigned int b, u = 0;
1155
1156         for (b = 0; b < ARRAY_SIZE(stream->buffers); ++b) {
1157                 unsigned int size = stream->buffers[b].size;
1158                 u8 *addr = stream->buffers[b].addr;
1159                 dma_addr_t dma = stream->buffers[b].dma;
1160
1161                 while (size >= max_packet_size) {
1162                         if (u >= stream->queue_length)
1163                                 goto bufsize_error;
1164                         urb = kmalloc(sizeof(*urb), GFP_KERNEL);
1165                         if (!urb)
1166                                 return -ENOMEM;
1167                         usb_init_urb(&urb->urb);
1168                         urb->urb.dev = ua->dev;
1169                         urb->urb.pipe = stream->usb_pipe;
1170                         urb->urb.transfer_flags = URB_ISO_ASAP |
1171                                         URB_NO_TRANSFER_DMA_MAP;
1172                         urb->urb.transfer_buffer = addr;
1173                         urb->urb.transfer_dma = dma;
1174                         urb->urb.transfer_buffer_length = max_packet_size;
1175                         urb->urb.number_of_packets = 1;
1176                         urb->urb.interval = 1;
1177                         urb->urb.context = ua;
1178                         urb->urb.complete = urb_complete;
1179                         urb->urb.iso_frame_desc[0].offset = 0;
1180                         urb->urb.iso_frame_desc[0].length = max_packet_size;
1181                         stream->urbs[u++] = urb;
1182                         size -= max_packet_size;
1183                         addr += max_packet_size;
1184                         dma += max_packet_size;
1185                 }
1186         }
1187         if (u == stream->queue_length)
1188                 return 0;
1189 bufsize_error:
1190         dev_err(&ua->dev->dev, "internal buffer size error\n");
1191         return -ENXIO;
1192 }
1193
1194 static void free_stream_urbs(struct ua101_stream *stream)
1195 {
1196         unsigned int i;
1197
1198         for (i = 0; i < stream->queue_length; ++i)
1199                 kfree(stream->urbs[i]);
1200 }
1201
1202 static void free_usb_related_resources(struct ua101 *ua,
1203                                        struct usb_interface *interface)
1204 {
1205         unsigned int i;
1206
1207         free_stream_urbs(&ua->capture);
1208         free_stream_urbs(&ua->playback);
1209         free_stream_buffers(ua, &ua->capture);
1210         free_stream_buffers(ua, &ua->playback);
1211
1212         for (i = 0; i < ARRAY_SIZE(ua->intf); ++i)
1213                 if (ua->intf[i]) {
1214                         usb_set_intfdata(ua->intf[i], NULL);
1215                         if (ua->intf[i] != interface)
1216                                 usb_driver_release_interface(&ua101_driver,
1217                                                              ua->intf[i]);
1218                 }
1219 }
1220
1221 static void ua101_card_free(struct snd_card *card)
1222 {
1223         struct ua101 *ua = card->private_data;
1224
1225         mutex_destroy(&ua->mutex);
1226 }
1227
1228 static int ua101_probe(struct usb_interface *interface,
1229                        const struct usb_device_id *usb_id)
1230 {
1231         static const struct snd_usb_midi_endpoint_info midi_ep = {
1232                 .out_cables = 0x0001,
1233                 .in_cables = 0x0001
1234         };
1235         static const struct snd_usb_audio_quirk midi_quirk = {
1236                 .type = QUIRK_MIDI_FIXED_ENDPOINT,
1237                 .data = &midi_ep
1238         };
1239         struct snd_card *card;
1240         struct ua101 *ua;
1241         unsigned int card_index, i;
1242         char usb_path[32];
1243         int err;
1244
1245         if (interface->altsetting->desc.bInterfaceNumber != 0)
1246                 return -ENODEV;
1247
1248         mutex_lock(&devices_mutex);
1249
1250         for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
1251                 if (enable[card_index] && !(devices_used & (1 << card_index)))
1252                         break;
1253         if (card_index >= SNDRV_CARDS) {
1254                 mutex_unlock(&devices_mutex);
1255                 return -ENOENT;
1256         }
1257         err = snd_card_create(index[card_index], id[card_index], THIS_MODULE,
1258                               sizeof(*ua), &card);
1259         if (err < 0) {
1260                 mutex_unlock(&devices_mutex);
1261                 return err;
1262         }
1263         card->private_free = ua101_card_free;
1264         ua = card->private_data;
1265         ua->dev = interface_to_usbdev(interface);
1266         ua->card = card;
1267         ua->card_index = card_index;
1268         INIT_LIST_HEAD(&ua->midi_list);
1269         spin_lock_init(&ua->lock);
1270         mutex_init(&ua->mutex);
1271         INIT_LIST_HEAD(&ua->ready_playback_urbs);
1272         tasklet_init(&ua->playback_tasklet,
1273                      playback_tasklet, (unsigned long)ua);
1274         init_waitqueue_head(&ua->alsa_capture_wait);
1275         init_waitqueue_head(&ua->rate_feedback_wait);
1276         init_waitqueue_head(&ua->alsa_playback_wait);
1277
1278 #ifdef UA1A_HACK
1279         if (ua->dev->descriptor.idProduct == cpu_to_le16(0x0018)) {
1280                 ua->intf[2] = interface;
1281                 ua->intf[0] = usb_ifnum_to_if(ua->dev, 1);
1282                 ua->intf[1] = usb_ifnum_to_if(ua->dev, 2);
1283                 usb_driver_claim_interface(&ua101_driver, ua->intf[0], ua);
1284                 usb_driver_claim_interface(&ua101_driver, ua->intf[1], ua);
1285         } else {
1286 #endif
1287         ua->intf[0] = interface;
1288         for (i = 1; i < ARRAY_SIZE(ua->intf); ++i) {
1289                 ua->intf[i] = usb_ifnum_to_if(ua->dev, i);
1290                 if (!ua->intf[i]) {
1291                         dev_err(&ua->dev->dev, "interface %u not found\n", i);
1292                         err = -ENXIO;
1293                         goto probe_error;
1294                 }
1295                 err = usb_driver_claim_interface(&ua101_driver,
1296                                                  ua->intf[i], ua);
1297                 if (err < 0) {
1298                         ua->intf[i] = NULL;
1299                         err = -EBUSY;
1300                         goto probe_error;
1301                 }
1302         }
1303 #ifdef UA1A_HACK
1304         }
1305 #endif
1306
1307         snd_card_set_dev(card, &interface->dev);
1308
1309 #ifdef UA1A_HACK
1310         if (ua->dev->descriptor.idProduct == cpu_to_le16(0x0018)) {
1311                 ua->format_bit = SNDRV_PCM_FMTBIT_S16_LE;
1312                 ua->rate = 44100;
1313                 ua->packets_per_second = 1000;
1314                 ua->capture.channels = 2;
1315                 ua->playback.channels = 2;
1316                 ua->capture.frame_bytes = 4;
1317                 ua->playback.frame_bytes = 4;
1318                 ua->capture.usb_pipe = usb_rcvisocpipe(ua->dev, 2);
1319                 ua->playback.usb_pipe = usb_sndisocpipe(ua->dev, 1);
1320                 ua->capture.max_packet_bytes = 192;
1321                 ua->playback.max_packet_bytes = 192;
1322         } else {
1323 #endif
1324         err = detect_usb_format(ua);
1325         if (err < 0)
1326                 goto probe_error;
1327 #ifdef UA1A_HACK
1328         }
1329 #endif
1330
1331         strcpy(card->driver, "UA-101");
1332         strcpy(card->shortname, "UA-101");
1333         usb_make_path(ua->dev, usb_path, sizeof(usb_path));
1334         snprintf(ua->card->longname, sizeof(ua->card->longname),
1335                  "EDIROL UA-101 (serial %s), %u Hz at %s, %s speed",
1336                  ua->dev->serial ? ua->dev->serial : "?", ua->rate, usb_path,
1337                  ua->dev->speed == USB_SPEED_HIGH ? "high" : "full");
1338
1339         err = alloc_stream_buffers(ua, &ua->capture);
1340         if (err < 0)
1341                 goto probe_error;
1342         err = alloc_stream_buffers(ua, &ua->playback);
1343         if (err < 0)
1344                 goto probe_error;
1345
1346         err = alloc_stream_urbs(ua, &ua->capture, capture_urb_complete);
1347         if (err < 0)
1348                 goto probe_error;
1349         err = alloc_stream_urbs(ua, &ua->playback, playback_urb_complete);
1350         if (err < 0)
1351                 goto probe_error;
1352
1353         err = snd_pcm_new(card, "UA-101", 0, 1, 1, &ua->pcm);
1354         if (err < 0)
1355                 goto probe_error;
1356         ua->pcm->private_data = ua;
1357         strcpy(ua->pcm->name, "UA-101");
1358         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_pcm_ops);
1359         snd_pcm_set_ops(ua->pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_pcm_ops);
1360
1361 #ifdef UA1A_HACK
1362         if (ua->dev->descriptor.idProduct != cpu_to_le16(0x0018)) {
1363 #endif
1364         err = snd_usbmidi_create(card, ua->intf[INTF_MIDI],
1365                                  &ua->midi_list, &midi_quirk);
1366         if (err < 0)
1367                 goto probe_error;
1368 #ifdef UA1A_HACK
1369         }
1370 #endif
1371
1372         err = snd_card_register(card);
1373         if (err < 0)
1374                 goto probe_error;
1375
1376         usb_set_intfdata(interface, ua);
1377         devices_used |= 1 << card_index;
1378
1379         mutex_unlock(&devices_mutex);
1380         return 0;
1381
1382 probe_error:
1383         free_usb_related_resources(ua, interface);
1384         snd_card_free(card);
1385         mutex_unlock(&devices_mutex);
1386         return err;
1387 }
1388
1389 static void ua101_disconnect(struct usb_interface *interface)
1390 {
1391         struct ua101 *ua = usb_get_intfdata(interface);
1392         struct list_head *midi;
1393
1394         if (!ua)
1395                 return;
1396
1397         mutex_lock(&devices_mutex);
1398
1399         set_bit(DISCONNECTED, &ua->states);
1400         wake_up(&ua->rate_feedback_wait);
1401
1402         /* make sure that userspace cannot create new requests */
1403         snd_card_disconnect(ua->card);
1404
1405         /* make sure that there are no pending USB requests */
1406         __list_for_each(midi, &ua->midi_list)
1407                 snd_usbmidi_disconnect(midi);
1408         abort_alsa_playback(ua);
1409         abort_alsa_capture(ua);
1410         mutex_lock(&ua->mutex);
1411         stop_usb_playback(ua);
1412         stop_usb_capture(ua);
1413         mutex_unlock(&ua->mutex);
1414
1415         free_usb_related_resources(ua, interface);
1416
1417         devices_used &= ~(1 << ua->card_index);
1418
1419         snd_card_free_when_closed(ua->card);
1420
1421         mutex_unlock(&devices_mutex);
1422 }
1423
1424 static struct usb_device_id ua101_ids[] = {
1425 #ifdef UA1A_HACK
1426         { USB_DEVICE(0x0582, 0x0018) },
1427 #endif
1428         { USB_DEVICE(0x0582, 0x007d) },
1429         { USB_DEVICE(0x0582, 0x008d) },
1430         { }
1431 };
1432 MODULE_DEVICE_TABLE(usb, ua101_ids);
1433
1434 static struct usb_driver ua101_driver = {
1435         .name = "snd-ua101",
1436         .id_table = ua101_ids,
1437         .probe = ua101_probe,
1438         .disconnect = ua101_disconnect,
1439 #if 0
1440         .suspend = ua101_suspend,
1441         .resume = ua101_resume,
1442 #endif
1443 };
1444
1445 static int __init alsa_card_ua101_init(void)
1446 {
1447         return usb_register(&ua101_driver);
1448 }
1449
1450 static void __exit alsa_card_ua101_exit(void)
1451 {
1452         usb_deregister(&ua101_driver);
1453         mutex_destroy(&devices_mutex);
1454 }
1455
1456 module_init(alsa_card_ua101_init);
1457 module_exit(alsa_card_ua101_exit);