[ALSA] usb-audio support for Turtle Beach Roadie
[linux-2.6.git] / sound / usb / usbaudio.c
1 /*
2  *   (Tentative) USB Audio Driver for ALSA
3  *
4  *   Main and PCM part
5  *
6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
7  *
8  *   Many codes borrowed from audio.c by
9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
11  *
12  *
13  *   This program is free software; you can redistribute it and/or modify
14  *   it under the terms of the GNU General Public License as published by
15  *   the Free Software Foundation; either version 2 of the License, or
16  *   (at your option) any later version.
17  *
18  *   This program is distributed in the hope that it will be useful,
19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  *   GNU General Public License for more details.
22  *
23  *   You should have received a copy of the GNU General Public License
24  *   along with this program; if not, write to the Free Software
25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
26  *
27  *
28  *  NOTES:
29  *
30  *   - async unlink should be used for avoiding the sleep inside lock.
31  *     2.4.22 usb-uhci seems buggy for async unlinking and results in
32  *     oops.  in such a cse, pass async_unlink=0 option.
33  *   - the linked URBs would be preferred but not used so far because of
34  *     the instability of unlinking.
35  *   - type II is not supported properly.  there is no device which supports
36  *     this type *correctly*.  SB extigy looks as if it supports, but it's
37  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
38  */
39
40
41 #include <sound/driver.h>
42 #include <linux/bitops.h>
43 #include <linux/init.h>
44 #include <linux/list.h>
45 #include <linux/slab.h>
46 #include <linux/string.h>
47 #include <linux/usb.h>
48 #include <linux/vmalloc.h>
49 #include <linux/moduleparam.h>
50 #include <linux/mutex.h>
51 #include <sound/core.h>
52 #include <sound/info.h>
53 #include <sound/pcm.h>
54 #include <sound/pcm_params.h>
55 #include <sound/initval.h>
56
57 #include "usbaudio.h"
58
59
60 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
61 MODULE_DESCRIPTION("USB Audio");
62 MODULE_LICENSE("GPL");
63 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
64
65
66 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
67 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
68 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;      /* Enable this card */
69 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Vendor ID for this card */
70 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Product ID for this card */
71 static int nrpacks = 4;         /* max. number of packets per urb */
72 static int async_unlink = 1;
73 static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
74
75 module_param_array(index, int, NULL, 0444);
76 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
77 module_param_array(id, charp, NULL, 0444);
78 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
79 module_param_array(enable, bool, NULL, 0444);
80 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
81 module_param_array(vid, int, NULL, 0444);
82 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
83 module_param_array(pid, int, NULL, 0444);
84 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
85 module_param(nrpacks, int, 0644);
86 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
87 module_param(async_unlink, bool, 0444);
88 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
89 module_param_array(device_setup, int, NULL, 0444);
90 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
91
92
93 /*
94  * debug the h/w constraints
95  */
96 /* #define HW_CONST_DEBUG */
97
98
99 /*
100  *
101  */
102
103 #define MAX_PACKS       10
104 #define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
105 #define MAX_URBS        8
106 #define SYNC_URBS       4       /* always four urbs for sync */
107 #define MIN_PACKS_URB   1       /* minimum 1 packet per urb */
108
109 struct audioformat {
110         struct list_head list;
111         snd_pcm_format_t format;        /* format type */
112         unsigned int channels;          /* # channels */
113         unsigned int fmt_type;          /* USB audio format type (1-3) */
114         unsigned int frame_size;        /* samples per frame for non-audio */
115         int iface;                      /* interface number */
116         unsigned char altsetting;       /* corresponding alternate setting */
117         unsigned char altset_idx;       /* array index of altenate setting */
118         unsigned char attributes;       /* corresponding attributes of cs endpoint */
119         unsigned char endpoint;         /* endpoint */
120         unsigned char ep_attr;          /* endpoint attributes */
121         unsigned int maxpacksize;       /* max. packet size */
122         unsigned int rates;             /* rate bitmasks */
123         unsigned int rate_min, rate_max;        /* min/max rates */
124         unsigned int nr_rates;          /* number of rate table entries */
125         unsigned int *rate_table;       /* rate table */
126 };
127
128 struct snd_usb_substream;
129
130 struct snd_urb_ctx {
131         struct urb *urb;
132         unsigned int buffer_size;       /* size of data buffer, if data URB */
133         struct snd_usb_substream *subs;
134         int index;      /* index for urb array */
135         int packets;    /* number of packets per urb */
136 };
137
138 struct snd_urb_ops {
139         int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
140         int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
141         int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
142         int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
143 };
144
145 struct snd_usb_substream {
146         struct snd_usb_stream *stream;
147         struct usb_device *dev;
148         struct snd_pcm_substream *pcm_substream;
149         int direction;  /* playback or capture */
150         int interface;  /* current interface */
151         int endpoint;   /* assigned endpoint */
152         struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
153         unsigned int cur_rate;          /* current rate (for hw_params callback) */
154         unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
155         unsigned int format;     /* USB data format */
156         unsigned int datapipe;   /* the data i/o pipe */
157         unsigned int syncpipe;   /* 1 - async out or adaptive in */
158         unsigned int datainterval;      /* log_2 of data packet interval */
159         unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
160         unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
161         unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
162         unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
163         unsigned int phase;      /* phase accumulator */
164         unsigned int maxpacksize;       /* max packet size in bytes */
165         unsigned int maxframesize;      /* max packet size in frames */
166         unsigned int curpacksize;       /* current packet size in bytes (for capture) */
167         unsigned int curframesize;      /* current packet size in frames (for capture) */
168         unsigned int fill_max: 1;       /* fill max packet size always */
169         unsigned int fmt_type;          /* USB audio format type (1-3) */
170         unsigned int packs_per_ms;      /* packets per millisecond (for playback) */
171
172         unsigned int running: 1;        /* running status */
173
174         unsigned int hwptr_done;                        /* processed frame position in the buffer */
175         unsigned int transfer_done;             /* processed frames since last period update */
176         unsigned long active_mask;      /* bitmask of active urbs */
177         unsigned long unlink_mask;      /* bitmask of unlinked urbs */
178
179         unsigned int nurbs;                     /* # urbs */
180         struct snd_urb_ctx dataurb[MAX_URBS];   /* data urb table */
181         struct snd_urb_ctx syncurb[SYNC_URBS];  /* sync urb table */
182         char *syncbuf;                          /* sync buffer for all sync URBs */
183         dma_addr_t sync_dma;                    /* DMA address of syncbuf */
184
185         u64 formats;                    /* format bitmasks (all or'ed) */
186         unsigned int num_formats;               /* number of supported audio formats (list) */
187         struct list_head fmt_list;      /* format list */
188         spinlock_t lock;
189
190         struct snd_urb_ops ops;         /* callbacks (must be filled at init) */
191 };
192
193
194 struct snd_usb_stream {
195         struct snd_usb_audio *chip;
196         struct snd_pcm *pcm;
197         int pcm_index;
198         unsigned int fmt_type;          /* USB audio format type (1-3) */
199         struct snd_usb_substream substream[2];
200         struct list_head list;
201 };
202
203
204 /*
205  * we keep the snd_usb_audio_t instances by ourselves for merging
206  * the all interfaces on the same card as one sound device.
207  */
208
209 static DEFINE_MUTEX(register_mutex);
210 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
211
212
213 /*
214  * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
215  * this will overflow at approx 524 kHz
216  */
217 static inline unsigned get_usb_full_speed_rate(unsigned int rate)
218 {
219         return ((rate << 13) + 62) / 125;
220 }
221
222 /*
223  * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
224  * this will overflow at approx 4 MHz
225  */
226 static inline unsigned get_usb_high_speed_rate(unsigned int rate)
227 {
228         return ((rate << 10) + 62) / 125;
229 }
230
231 /* convert our full speed USB rate into sampling rate in Hz */
232 static inline unsigned get_full_speed_hz(unsigned int usb_rate)
233 {
234         return (usb_rate * 125 + (1 << 12)) >> 13;
235 }
236
237 /* convert our high speed USB rate into sampling rate in Hz */
238 static inline unsigned get_high_speed_hz(unsigned int usb_rate)
239 {
240         return (usb_rate * 125 + (1 << 9)) >> 10;
241 }
242
243
244 /*
245  * prepare urb for full speed capture sync pipe
246  *
247  * fill the length and offset of each urb descriptor.
248  * the fixed 10.14 frequency is passed through the pipe.
249  */
250 static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
251                                     struct snd_pcm_runtime *runtime,
252                                     struct urb *urb)
253 {
254         unsigned char *cp = urb->transfer_buffer;
255         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
256
257         urb->dev = ctx->subs->dev; /* we need to set this at each time */
258         urb->iso_frame_desc[0].length = 3;
259         urb->iso_frame_desc[0].offset = 0;
260         cp[0] = subs->freqn >> 2;
261         cp[1] = subs->freqn >> 10;
262         cp[2] = subs->freqn >> 18;
263         return 0;
264 }
265
266 /*
267  * prepare urb for high speed capture sync pipe
268  *
269  * fill the length and offset of each urb descriptor.
270  * the fixed 12.13 frequency is passed as 16.16 through the pipe.
271  */
272 static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
273                                        struct snd_pcm_runtime *runtime,
274                                        struct urb *urb)
275 {
276         unsigned char *cp = urb->transfer_buffer;
277         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
278
279         urb->dev = ctx->subs->dev; /* we need to set this at each time */
280         urb->iso_frame_desc[0].length = 4;
281         urb->iso_frame_desc[0].offset = 0;
282         cp[0] = subs->freqn;
283         cp[1] = subs->freqn >> 8;
284         cp[2] = subs->freqn >> 16;
285         cp[3] = subs->freqn >> 24;
286         return 0;
287 }
288
289 /*
290  * process after capture sync complete
291  * - nothing to do
292  */
293 static int retire_capture_sync_urb(struct snd_usb_substream *subs,
294                                    struct snd_pcm_runtime *runtime,
295                                    struct urb *urb)
296 {
297         return 0;
298 }
299
300 /*
301  * prepare urb for capture data pipe
302  *
303  * fill the offset and length of each descriptor.
304  *
305  * we use a temporary buffer to write the captured data.
306  * since the length of written data is determined by host, we cannot
307  * write onto the pcm buffer directly...  the data is thus copied
308  * later at complete callback to the global buffer.
309  */
310 static int prepare_capture_urb(struct snd_usb_substream *subs,
311                                struct snd_pcm_runtime *runtime,
312                                struct urb *urb)
313 {
314         int i, offs;
315         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
316
317         offs = 0;
318         urb->dev = ctx->subs->dev; /* we need to set this at each time */
319         for (i = 0; i < ctx->packets; i++) {
320                 urb->iso_frame_desc[i].offset = offs;
321                 urb->iso_frame_desc[i].length = subs->curpacksize;
322                 offs += subs->curpacksize;
323         }
324         urb->transfer_buffer_length = offs;
325         urb->number_of_packets = ctx->packets;
326 #if 0 // for check
327         if (! urb->bandwidth) {
328                 int bustime;
329                 bustime = usb_check_bandwidth(urb->dev, urb);
330                 if (bustime < 0)
331                         return bustime;
332                 printk("urb %d: bandwidth = %d (packets = %d)\n", ctx->index, bustime, urb->number_of_packets);
333                 usb_claim_bandwidth(urb->dev, urb, bustime, 1);
334         }
335 #endif // for check
336         return 0;
337 }
338
339 /*
340  * process after capture complete
341  *
342  * copy the data from each desctiptor to the pcm buffer, and
343  * update the current position.
344  */
345 static int retire_capture_urb(struct snd_usb_substream *subs,
346                               struct snd_pcm_runtime *runtime,
347                               struct urb *urb)
348 {
349         unsigned long flags;
350         unsigned char *cp;
351         int i;
352         unsigned int stride, len, oldptr;
353         int period_elapsed = 0;
354
355         stride = runtime->frame_bits >> 3;
356
357         for (i = 0; i < urb->number_of_packets; i++) {
358                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
359                 if (urb->iso_frame_desc[i].status) {
360                         snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
361                         // continue;
362                 }
363                 len = urb->iso_frame_desc[i].actual_length / stride;
364                 if (! len)
365                         continue;
366                 /* update the current pointer */
367                 spin_lock_irqsave(&subs->lock, flags);
368                 oldptr = subs->hwptr_done;
369                 subs->hwptr_done += len;
370                 if (subs->hwptr_done >= runtime->buffer_size)
371                         subs->hwptr_done -= runtime->buffer_size;
372                 subs->transfer_done += len;
373                 if (subs->transfer_done >= runtime->period_size) {
374                         subs->transfer_done -= runtime->period_size;
375                         period_elapsed = 1;
376                 }
377                 spin_unlock_irqrestore(&subs->lock, flags);
378                 /* copy a data chunk */
379                 if (oldptr + len > runtime->buffer_size) {
380                         unsigned int cnt = runtime->buffer_size - oldptr;
381                         unsigned int blen = cnt * stride;
382                         memcpy(runtime->dma_area + oldptr * stride, cp, blen);
383                         memcpy(runtime->dma_area, cp + blen, len * stride - blen);
384                 } else {
385                         memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
386                 }
387         }
388         if (period_elapsed)
389                 snd_pcm_period_elapsed(subs->pcm_substream);
390         return 0;
391 }
392
393
394 /*
395  * prepare urb for full speed playback sync pipe
396  *
397  * set up the offset and length to receive the current frequency.
398  */
399
400 static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
401                                      struct snd_pcm_runtime *runtime,
402                                      struct urb *urb)
403 {
404         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
405
406         urb->dev = ctx->subs->dev; /* we need to set this at each time */
407         urb->iso_frame_desc[0].length = 3;
408         urb->iso_frame_desc[0].offset = 0;
409         return 0;
410 }
411
412 /*
413  * prepare urb for high speed playback sync pipe
414  *
415  * set up the offset and length to receive the current frequency.
416  */
417
418 static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs,
419                                         struct snd_pcm_runtime *runtime,
420                                         struct urb *urb)
421 {
422         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
423
424         urb->dev = ctx->subs->dev; /* we need to set this at each time */
425         urb->iso_frame_desc[0].length = 4;
426         urb->iso_frame_desc[0].offset = 0;
427         return 0;
428 }
429
430 /*
431  * process after full speed playback sync complete
432  *
433  * retrieve the current 10.14 frequency from pipe, and set it.
434  * the value is referred in prepare_playback_urb().
435  */
436 static int retire_playback_sync_urb(struct snd_usb_substream *subs,
437                                     struct snd_pcm_runtime *runtime,
438                                     struct urb *urb)
439 {
440         unsigned int f;
441         unsigned long flags;
442
443         if (urb->iso_frame_desc[0].status == 0 &&
444             urb->iso_frame_desc[0].actual_length == 3) {
445                 f = combine_triple((u8*)urb->transfer_buffer) << 2;
446                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
447                         spin_lock_irqsave(&subs->lock, flags);
448                         subs->freqm = f;
449                         spin_unlock_irqrestore(&subs->lock, flags);
450                 }
451         }
452
453         return 0;
454 }
455
456 /*
457  * process after high speed playback sync complete
458  *
459  * retrieve the current 12.13 frequency from pipe, and set it.
460  * the value is referred in prepare_playback_urb().
461  */
462 static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs,
463                                        struct snd_pcm_runtime *runtime,
464                                        struct urb *urb)
465 {
466         unsigned int f;
467         unsigned long flags;
468
469         if (urb->iso_frame_desc[0].status == 0 &&
470             urb->iso_frame_desc[0].actual_length == 4) {
471                 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
472                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
473                         spin_lock_irqsave(&subs->lock, flags);
474                         subs->freqm = f;
475                         spin_unlock_irqrestore(&subs->lock, flags);
476                 }
477         }
478
479         return 0;
480 }
481
482 /* determine the number of frames in the next packet */
483 static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
484 {
485         if (subs->fill_max)
486                 return subs->maxframesize;
487         else {
488                 subs->phase = (subs->phase & 0xffff)
489                         + (subs->freqm << subs->datainterval);
490                 return min(subs->phase >> 16, subs->maxframesize);
491         }
492 }
493
494 /*
495  * Prepare urb for streaming before playback starts.
496  *
497  * We don't yet have data, so we send a frame of silence.
498  */
499 static int prepare_startup_playback_urb(struct snd_usb_substream *subs,
500                                         struct snd_pcm_runtime *runtime,
501                                         struct urb *urb)
502 {
503         unsigned int i, offs, counts;
504         struct snd_urb_ctx *ctx = urb->context;
505         int stride = runtime->frame_bits >> 3;
506
507         offs = 0;
508         urb->dev = ctx->subs->dev;
509         urb->number_of_packets = subs->packs_per_ms;
510         for (i = 0; i < subs->packs_per_ms; ++i) {
511                 counts = snd_usb_audio_next_packet_size(subs);
512                 urb->iso_frame_desc[i].offset = offs * stride;
513                 urb->iso_frame_desc[i].length = counts * stride;
514                 offs += counts;
515         }
516         urb->transfer_buffer_length = offs * stride;
517         memset(urb->transfer_buffer,
518                subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,
519                offs * stride);
520         return 0;
521 }
522
523 /*
524  * prepare urb for playback data pipe
525  *
526  * Since a URB can handle only a single linear buffer, we must use double
527  * buffering when the data to be transferred overflows the buffer boundary.
528  * To avoid inconsistencies when updating hwptr_done, we use double buffering
529  * for all URBs.
530  */
531 static int prepare_playback_urb(struct snd_usb_substream *subs,
532                                 struct snd_pcm_runtime *runtime,
533                                 struct urb *urb)
534 {
535         int i, stride, offs;
536         unsigned int counts;
537         unsigned long flags;
538         int period_elapsed = 0;
539         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
540
541         stride = runtime->frame_bits >> 3;
542
543         offs = 0;
544         urb->dev = ctx->subs->dev; /* we need to set this at each time */
545         urb->number_of_packets = 0;
546         spin_lock_irqsave(&subs->lock, flags);
547         for (i = 0; i < ctx->packets; i++) {
548                 counts = snd_usb_audio_next_packet_size(subs);
549                 /* set up descriptor */
550                 urb->iso_frame_desc[i].offset = offs * stride;
551                 urb->iso_frame_desc[i].length = counts * stride;
552                 offs += counts;
553                 urb->number_of_packets++;
554                 subs->transfer_done += counts;
555                 if (subs->transfer_done >= runtime->period_size) {
556                         subs->transfer_done -= runtime->period_size;
557                         period_elapsed = 1;
558                         if (subs->fmt_type == USB_FORMAT_TYPE_II) {
559                                 if (subs->transfer_done > 0) {
560                                         /* FIXME: fill-max mode is not
561                                          * supported yet */
562                                         offs -= subs->transfer_done;
563                                         counts -= subs->transfer_done;
564                                         urb->iso_frame_desc[i].length =
565                                                 counts * stride;
566                                         subs->transfer_done = 0;
567                                 }
568                                 i++;
569                                 if (i < ctx->packets) {
570                                         /* add a transfer delimiter */
571                                         urb->iso_frame_desc[i].offset =
572                                                 offs * stride;
573                                         urb->iso_frame_desc[i].length = 0;
574                                         urb->number_of_packets++;
575                                 }
576                                 break;
577                         }
578                 }
579                 /* finish at the frame boundary at/after the period boundary */
580                 if (period_elapsed &&
581                     (i & (subs->packs_per_ms - 1)) == subs->packs_per_ms - 1)
582                         break;
583         }
584         if (subs->hwptr_done + offs > runtime->buffer_size) {
585                 /* err, the transferred area goes over buffer boundary. */
586                 unsigned int len = runtime->buffer_size - subs->hwptr_done;
587                 memcpy(urb->transfer_buffer,
588                        runtime->dma_area + subs->hwptr_done * stride,
589                        len * stride);
590                 memcpy(urb->transfer_buffer + len * stride,
591                        runtime->dma_area,
592                        (offs - len) * stride);
593         } else {
594                 memcpy(urb->transfer_buffer,
595                        runtime->dma_area + subs->hwptr_done * stride,
596                        offs * stride);
597         }
598         subs->hwptr_done += offs;
599         if (subs->hwptr_done >= runtime->buffer_size)
600                 subs->hwptr_done -= runtime->buffer_size;
601         spin_unlock_irqrestore(&subs->lock, flags);
602         urb->transfer_buffer_length = offs * stride;
603         if (period_elapsed)
604                 snd_pcm_period_elapsed(subs->pcm_substream);
605         return 0;
606 }
607
608 /*
609  * process after playback data complete
610  * - nothing to do
611  */
612 static int retire_playback_urb(struct snd_usb_substream *subs,
613                                struct snd_pcm_runtime *runtime,
614                                struct urb *urb)
615 {
616         return 0;
617 }
618
619
620 /*
621  */
622 static struct snd_urb_ops audio_urb_ops[2] = {
623         {
624                 .prepare =      prepare_startup_playback_urb,
625                 .retire =       retire_playback_urb,
626                 .prepare_sync = prepare_playback_sync_urb,
627                 .retire_sync =  retire_playback_sync_urb,
628         },
629         {
630                 .prepare =      prepare_capture_urb,
631                 .retire =       retire_capture_urb,
632                 .prepare_sync = prepare_capture_sync_urb,
633                 .retire_sync =  retire_capture_sync_urb,
634         },
635 };
636
637 static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
638         {
639                 .prepare =      prepare_startup_playback_urb,
640                 .retire =       retire_playback_urb,
641                 .prepare_sync = prepare_playback_sync_urb_hs,
642                 .retire_sync =  retire_playback_sync_urb_hs,
643         },
644         {
645                 .prepare =      prepare_capture_urb,
646                 .retire =       retire_capture_urb,
647                 .prepare_sync = prepare_capture_sync_urb_hs,
648                 .retire_sync =  retire_capture_sync_urb,
649         },
650 };
651
652 /*
653  * complete callback from data urb
654  */
655 static void snd_complete_urb(struct urb *urb, struct pt_regs *regs)
656 {
657         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
658         struct snd_usb_substream *subs = ctx->subs;
659         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
660         int err = 0;
661
662         if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
663             ! subs->running || /* can be stopped during retire callback */
664             (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
665             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
666                 clear_bit(ctx->index, &subs->active_mask);
667                 if (err < 0) {
668                         snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
669                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
670                 }
671         }
672 }
673
674
675 /*
676  * complete callback from sync urb
677  */
678 static void snd_complete_sync_urb(struct urb *urb, struct pt_regs *regs)
679 {
680         struct snd_urb_ctx *ctx = (struct snd_urb_ctx *)urb->context;
681         struct snd_usb_substream *subs = ctx->subs;
682         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
683         int err = 0;
684
685         if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
686             ! subs->running || /* can be stopped during retire callback */
687             (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
688             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
689                 clear_bit(ctx->index + 16, &subs->active_mask);
690                 if (err < 0) {
691                         snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
692                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
693                 }
694         }
695 }
696
697
698 /* get the physical page pointer at the given offset */
699 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
700                                              unsigned long offset)
701 {
702         void *pageptr = subs->runtime->dma_area + offset;
703         return vmalloc_to_page(pageptr);
704 }
705
706 /* allocate virtual buffer; may be called more than once */
707 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
708 {
709         struct snd_pcm_runtime *runtime = subs->runtime;
710         if (runtime->dma_area) {
711                 if (runtime->dma_bytes >= size)
712                         return 0; /* already large enough */
713                 vfree(runtime->dma_area);
714         }
715         runtime->dma_area = vmalloc(size);
716         if (! runtime->dma_area)
717                 return -ENOMEM;
718         runtime->dma_bytes = size;
719         return 0;
720 }
721
722 /* free virtual buffer; may be called more than once */
723 static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
724 {
725         struct snd_pcm_runtime *runtime = subs->runtime;
726
727         vfree(runtime->dma_area);
728         runtime->dma_area = NULL;
729         return 0;
730 }
731
732
733 /*
734  * unlink active urbs.
735  */
736 static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
737 {
738         unsigned int i;
739         int async;
740
741         subs->running = 0;
742
743         if (!force && subs->stream->chip->shutdown) /* to be sure... */
744                 return -EBADFD;
745
746         async = !can_sleep && async_unlink;
747
748         if (! async && in_interrupt())
749                 return 0;
750
751         for (i = 0; i < subs->nurbs; i++) {
752                 if (test_bit(i, &subs->active_mask)) {
753                         if (! test_and_set_bit(i, &subs->unlink_mask)) {
754                                 struct urb *u = subs->dataurb[i].urb;
755                                 if (async)
756                                         usb_unlink_urb(u);
757                                 else
758                                         usb_kill_urb(u);
759                         }
760                 }
761         }
762         if (subs->syncpipe) {
763                 for (i = 0; i < SYNC_URBS; i++) {
764                         if (test_bit(i+16, &subs->active_mask)) {
765                                 if (! test_and_set_bit(i+16, &subs->unlink_mask)) {
766                                         struct urb *u = subs->syncurb[i].urb;
767                                         if (async)
768                                                 usb_unlink_urb(u);
769                                         else
770                                                 usb_kill_urb(u);
771                                 }
772                         }
773                 }
774         }
775         return 0;
776 }
777
778
779 static const char *usb_error_string(int err)
780 {
781         switch (err) {
782         case -ENODEV:
783                 return "no device";
784         case -ENOENT:
785                 return "endpoint not enabled";
786         case -EPIPE:
787                 return "endpoint stalled";
788         case -ENOSPC:
789                 return "not enough bandwidth";
790         case -ESHUTDOWN:
791                 return "device disabled";
792         case -EHOSTUNREACH:
793                 return "device suspended";
794 #ifndef CONFIG_USB_EHCI_SPLIT_ISO
795         case -ENOSYS:
796                 return "enable CONFIG_USB_EHCI_SPLIT_ISO to play through a hub";
797 #endif
798         case -EINVAL:
799         case -EAGAIN:
800         case -EFBIG:
801         case -EMSGSIZE:
802                 return "internal error";
803         default:
804                 return "unknown error";
805         }
806 }
807
808 /*
809  * set up and start data/sync urbs
810  */
811 static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime)
812 {
813         unsigned int i;
814         int err;
815
816         if (subs->stream->chip->shutdown)
817                 return -EBADFD;
818
819         for (i = 0; i < subs->nurbs; i++) {
820                 snd_assert(subs->dataurb[i].urb, return -EINVAL);
821                 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
822                         snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
823                         goto __error;
824                 }
825         }
826         if (subs->syncpipe) {
827                 for (i = 0; i < SYNC_URBS; i++) {
828                         snd_assert(subs->syncurb[i].urb, return -EINVAL);
829                         if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
830                                 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
831                                 goto __error;
832                         }
833                 }
834         }
835
836         subs->active_mask = 0;
837         subs->unlink_mask = 0;
838         subs->running = 1;
839         for (i = 0; i < subs->nurbs; i++) {
840                 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);
841                 if (err < 0) {
842                         snd_printk(KERN_ERR "cannot submit datapipe "
843                                    "for urb %d, error %d: %s\n",
844                                    i, err, usb_error_string(err));
845                         goto __error;
846                 }
847                 set_bit(i, &subs->active_mask);
848         }
849         if (subs->syncpipe) {
850                 for (i = 0; i < SYNC_URBS; i++) {
851                         err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);
852                         if (err < 0) {
853                                 snd_printk(KERN_ERR "cannot submit syncpipe "
854                                            "for urb %d, error %d: %s\n",
855                                            i, err, usb_error_string(err));
856                                 goto __error;
857                         }
858                         set_bit(i + 16, &subs->active_mask);
859                 }
860         }
861         return 0;
862
863  __error:
864         // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
865         deactivate_urbs(subs, 0, 0);
866         return -EPIPE;
867 }
868
869
870 /*
871  *  wait until all urbs are processed.
872  */
873 static int wait_clear_urbs(struct snd_usb_substream *subs)
874 {
875         unsigned long end_time = jiffies + msecs_to_jiffies(1000);
876         unsigned int i;
877         int alive;
878
879         do {
880                 alive = 0;
881                 for (i = 0; i < subs->nurbs; i++) {
882                         if (test_bit(i, &subs->active_mask))
883                                 alive++;
884                 }
885                 if (subs->syncpipe) {
886                         for (i = 0; i < SYNC_URBS; i++) {
887                                 if (test_bit(i + 16, &subs->active_mask))
888                                         alive++;
889                         }
890                 }
891                 if (! alive)
892                         break;
893                 schedule_timeout_uninterruptible(1);
894         } while (time_before(jiffies, end_time));
895         if (alive)
896                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
897         return 0;
898 }
899
900
901 /*
902  * return the current pcm pointer.  just return the hwptr_done value.
903  */
904 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
905 {
906         struct snd_usb_substream *subs;
907         snd_pcm_uframes_t hwptr_done;
908         
909         subs = (struct snd_usb_substream *)substream->runtime->private_data;
910         spin_lock(&subs->lock);
911         hwptr_done = subs->hwptr_done;
912         spin_unlock(&subs->lock);
913         return hwptr_done;
914 }
915
916
917 /*
918  * start/stop playback substream
919  */
920 static int snd_usb_pcm_playback_trigger(struct snd_pcm_substream *substream,
921                                         int cmd)
922 {
923         struct snd_usb_substream *subs = substream->runtime->private_data;
924
925         switch (cmd) {
926         case SNDRV_PCM_TRIGGER_START:
927                 subs->ops.prepare = prepare_playback_urb;
928                 return 0;
929         case SNDRV_PCM_TRIGGER_STOP:
930                 return deactivate_urbs(subs, 0, 0);
931         default:
932                 return -EINVAL;
933         }
934 }
935
936 /*
937  * start/stop capture substream
938  */
939 static int snd_usb_pcm_capture_trigger(struct snd_pcm_substream *substream,
940                                        int cmd)
941 {
942         struct snd_usb_substream *subs = substream->runtime->private_data;
943
944         switch (cmd) {
945         case SNDRV_PCM_TRIGGER_START:
946                 return start_urbs(subs, substream->runtime);
947         case SNDRV_PCM_TRIGGER_STOP:
948                 return deactivate_urbs(subs, 0, 0);
949         default:
950                 return -EINVAL;
951         }
952 }
953
954
955 /*
956  * release a urb data
957  */
958 static void release_urb_ctx(struct snd_urb_ctx *u)
959 {
960         if (u->urb) {
961                 if (u->buffer_size)
962                         usb_buffer_free(u->subs->dev, u->buffer_size,
963                                         u->urb->transfer_buffer,
964                                         u->urb->transfer_dma);
965                 usb_free_urb(u->urb);
966                 u->urb = NULL;
967         }
968 }
969
970 /*
971  * release a substream
972  */
973 static void release_substream_urbs(struct snd_usb_substream *subs, int force)
974 {
975         int i;
976
977         /* stop urbs (to be sure) */
978         deactivate_urbs(subs, force, 1);
979         wait_clear_urbs(subs);
980
981         for (i = 0; i < MAX_URBS; i++)
982                 release_urb_ctx(&subs->dataurb[i]);
983         for (i = 0; i < SYNC_URBS; i++)
984                 release_urb_ctx(&subs->syncurb[i]);
985         usb_buffer_free(subs->dev, SYNC_URBS * 4,
986                         subs->syncbuf, subs->sync_dma);
987         subs->syncbuf = NULL;
988         subs->nurbs = 0;
989 }
990
991 /*
992  * initialize a substream for plaback/capture
993  */
994 static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
995                                unsigned int rate, unsigned int frame_bits)
996 {
997         unsigned int maxsize, n, i;
998         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
999         unsigned int npacks[MAX_URBS], urb_packs, total_packs, packs_per_ms;
1000
1001         /* calculate the frequency in 16.16 format */
1002         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1003                 subs->freqn = get_usb_full_speed_rate(rate);
1004         else
1005                 subs->freqn = get_usb_high_speed_rate(rate);
1006         subs->freqm = subs->freqn;
1007         /* calculate max. frequency */
1008         if (subs->maxpacksize) {
1009                 /* whatever fits into a max. size packet */
1010                 maxsize = subs->maxpacksize;
1011                 subs->freqmax = (maxsize / (frame_bits >> 3))
1012                                 << (16 - subs->datainterval);
1013         } else {
1014                 /* no max. packet size: just take 25% higher than nominal */
1015                 subs->freqmax = subs->freqn + (subs->freqn >> 2);
1016                 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
1017                                 >> (16 - subs->datainterval);
1018         }
1019         subs->phase = 0;
1020
1021         if (subs->fill_max)
1022                 subs->curpacksize = subs->maxpacksize;
1023         else
1024                 subs->curpacksize = maxsize;
1025
1026         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
1027                 packs_per_ms = 8 >> subs->datainterval;
1028         else
1029                 packs_per_ms = 1;
1030         subs->packs_per_ms = packs_per_ms;
1031
1032         if (is_playback) {
1033                 urb_packs = nrpacks;
1034                 urb_packs = max(urb_packs, (unsigned int)MIN_PACKS_URB);
1035                 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
1036         } else
1037                 urb_packs = 1;
1038         urb_packs *= packs_per_ms;
1039
1040         /* decide how many packets to be used */
1041         if (is_playback) {
1042                 unsigned int minsize;
1043                 /* determine how small a packet can be */
1044                 minsize = (subs->freqn >> (16 - subs->datainterval))
1045                           * (frame_bits >> 3);
1046                 /* with sync from device, assume it can be 12% lower */
1047                 if (subs->syncpipe)
1048                         minsize -= minsize >> 3;
1049                 minsize = max(minsize, 1u);
1050                 total_packs = (period_bytes + minsize - 1) / minsize;
1051                 /* round up to multiple of packs_per_ms */
1052                 total_packs = (total_packs + packs_per_ms - 1)
1053                                 & ~(packs_per_ms - 1);
1054                 /* we need at least two URBs for queueing */
1055                 if (total_packs < 2 * MIN_PACKS_URB * packs_per_ms)
1056                         total_packs = 2 * MIN_PACKS_URB * packs_per_ms;
1057         } else {
1058                 total_packs = MAX_URBS * urb_packs;
1059         }
1060         subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
1061         if (subs->nurbs > MAX_URBS) {
1062                 /* too much... */
1063                 subs->nurbs = MAX_URBS;
1064                 total_packs = MAX_URBS * urb_packs;
1065         }
1066         n = total_packs;
1067         for (i = 0; i < subs->nurbs; i++) {
1068                 npacks[i] = n > urb_packs ? urb_packs : n;
1069                 n -= urb_packs;
1070         }
1071         if (subs->nurbs <= 1) {
1072                 /* too little - we need at least two packets
1073                  * to ensure contiguous playback/capture
1074                  */
1075                 subs->nurbs = 2;
1076                 npacks[0] = (total_packs + 1) / 2;
1077                 npacks[1] = total_packs - npacks[0];
1078         } else if (npacks[subs->nurbs-1] < MIN_PACKS_URB * packs_per_ms) {
1079                 /* the last packet is too small.. */
1080                 if (subs->nurbs > 2) {
1081                         /* merge to the first one */
1082                         npacks[0] += npacks[subs->nurbs - 1];
1083                         subs->nurbs--;
1084                 } else {
1085                         /* divide to two */
1086                         subs->nurbs = 2;
1087                         npacks[0] = (total_packs + 1) / 2;
1088                         npacks[1] = total_packs - npacks[0];
1089                 }
1090         }
1091
1092         /* allocate and initialize data urbs */
1093         for (i = 0; i < subs->nurbs; i++) {
1094                 struct snd_urb_ctx *u = &subs->dataurb[i];
1095                 u->index = i;
1096                 u->subs = subs;
1097                 u->packets = npacks[i];
1098                 u->buffer_size = maxsize * u->packets;
1099                 if (subs->fmt_type == USB_FORMAT_TYPE_II)
1100                         u->packets++; /* for transfer delimiter */
1101                 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
1102                 if (! u->urb)
1103                         goto out_of_memory;
1104                 u->urb->transfer_buffer =
1105                         usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL,
1106                                          &u->urb->transfer_dma);
1107                 if (! u->urb->transfer_buffer)
1108                         goto out_of_memory;
1109                 u->urb->pipe = subs->datapipe;
1110                 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
1111                 u->urb->interval = 1 << subs->datainterval;
1112                 u->urb->context = u;
1113                 u->urb->complete = snd_complete_urb;
1114         }
1115
1116         if (subs->syncpipe) {
1117                 /* allocate and initialize sync urbs */
1118                 subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4,
1119                                                  GFP_KERNEL, &subs->sync_dma);
1120                 if (! subs->syncbuf)
1121                         goto out_of_memory;
1122                 for (i = 0; i < SYNC_URBS; i++) {
1123                         struct snd_urb_ctx *u = &subs->syncurb[i];
1124                         u->index = i;
1125                         u->subs = subs;
1126                         u->packets = 1;
1127                         u->urb = usb_alloc_urb(1, GFP_KERNEL);
1128                         if (! u->urb)
1129                                 goto out_of_memory;
1130                         u->urb->transfer_buffer = subs->syncbuf + i * 4;
1131                         u->urb->transfer_dma = subs->sync_dma + i * 4;
1132                         u->urb->transfer_buffer_length = 4;
1133                         u->urb->pipe = subs->syncpipe;
1134                         u->urb->transfer_flags = URB_ISO_ASAP |
1135                                                  URB_NO_TRANSFER_DMA_MAP;
1136                         u->urb->number_of_packets = 1;
1137                         u->urb->interval = 1 << subs->syncinterval;
1138                         u->urb->context = u;
1139                         u->urb->complete = snd_complete_sync_urb;
1140                 }
1141         }
1142         return 0;
1143
1144 out_of_memory:
1145         release_substream_urbs(subs, 0);
1146         return -ENOMEM;
1147 }
1148
1149
1150 /*
1151  * find a matching audio format
1152  */
1153 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
1154                                        unsigned int rate, unsigned int channels)
1155 {
1156         struct list_head *p;
1157         struct audioformat *found = NULL;
1158         int cur_attr = 0, attr;
1159
1160         list_for_each(p, &subs->fmt_list) {
1161                 struct audioformat *fp;
1162                 fp = list_entry(p, struct audioformat, list);
1163                 if (fp->format != format || fp->channels != channels)
1164                         continue;
1165                 if (rate < fp->rate_min || rate > fp->rate_max)
1166                         continue;
1167                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
1168                         unsigned int i;
1169                         for (i = 0; i < fp->nr_rates; i++)
1170                                 if (fp->rate_table[i] == rate)
1171                                         break;
1172                         if (i >= fp->nr_rates)
1173                                 continue;
1174                 }
1175                 attr = fp->ep_attr & EP_ATTR_MASK;
1176                 if (! found) {
1177                         found = fp;
1178                         cur_attr = attr;
1179                         continue;
1180                 }
1181                 /* avoid async out and adaptive in if the other method
1182                  * supports the same format.
1183                  * this is a workaround for the case like
1184                  * M-audio audiophile USB.
1185                  */
1186                 if (attr != cur_attr) {
1187                         if ((attr == EP_ATTR_ASYNC &&
1188                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1189                             (attr == EP_ATTR_ADAPTIVE &&
1190                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
1191                                 continue;
1192                         if ((cur_attr == EP_ATTR_ASYNC &&
1193                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1194                             (cur_attr == EP_ATTR_ADAPTIVE &&
1195                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
1196                                 found = fp;
1197                                 cur_attr = attr;
1198                                 continue;
1199                         }
1200                 }
1201                 /* find the format with the largest max. packet size */
1202                 if (fp->maxpacksize > found->maxpacksize) {
1203                         found = fp;
1204                         cur_attr = attr;
1205                 }
1206         }
1207         return found;
1208 }
1209
1210
1211 /*
1212  * initialize the picth control and sample rate
1213  */
1214 static int init_usb_pitch(struct usb_device *dev, int iface,
1215                           struct usb_host_interface *alts,
1216                           struct audioformat *fmt)
1217 {
1218         unsigned int ep;
1219         unsigned char data[1];
1220         int err;
1221
1222         ep = get_endpoint(alts, 0)->bEndpointAddress;
1223         /* if endpoint has pitch control, enable it */
1224         if (fmt->attributes & EP_CS_ATTR_PITCH_CONTROL) {
1225                 data[0] = 1;
1226                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1227                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1228                                            PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
1229                         snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
1230                                    dev->devnum, iface, ep);
1231                         return err;
1232                 }
1233         }
1234         return 0;
1235 }
1236
1237 static int init_usb_sample_rate(struct usb_device *dev, int iface,
1238                                 struct usb_host_interface *alts,
1239                                 struct audioformat *fmt, int rate)
1240 {
1241         unsigned int ep;
1242         unsigned char data[3];
1243         int err;
1244
1245         ep = get_endpoint(alts, 0)->bEndpointAddress;
1246         /* if endpoint has sampling rate control, set it */
1247         if (fmt->attributes & EP_CS_ATTR_SAMPLE_RATE) {
1248                 int crate;
1249                 data[0] = rate;
1250                 data[1] = rate >> 8;
1251                 data[2] = rate >> 16;
1252                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1253                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1254                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1255                         snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep 0x%x\n",
1256                                    dev->devnum, iface, fmt->altsetting, rate, ep);
1257                         return err;
1258                 }
1259                 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), GET_CUR,
1260                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
1261                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1262                         snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep 0x%x\n",
1263                                    dev->devnum, iface, fmt->altsetting, ep);
1264                         return 0; /* some devices don't support reading */
1265                 }
1266                 crate = data[0] | (data[1] << 8) | (data[2] << 16);
1267                 if (crate != rate) {
1268                         snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
1269                         // runtime->rate = crate;
1270                 }
1271         }
1272         return 0;
1273 }
1274
1275 /*
1276  * find a matching format and set up the interface
1277  */
1278 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
1279 {
1280         struct usb_device *dev = subs->dev;
1281         struct usb_host_interface *alts;
1282         struct usb_interface_descriptor *altsd;
1283         struct usb_interface *iface;
1284         unsigned int ep, attr;
1285         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1286         int err;
1287
1288         iface = usb_ifnum_to_if(dev, fmt->iface);
1289         snd_assert(iface, return -EINVAL);
1290         alts = &iface->altsetting[fmt->altset_idx];
1291         altsd = get_iface_desc(alts);
1292         snd_assert(altsd->bAlternateSetting == fmt->altsetting, return -EINVAL);
1293
1294         if (fmt == subs->cur_audiofmt)
1295                 return 0;
1296
1297         /* close the old interface */
1298         if (subs->interface >= 0 && subs->interface != fmt->iface) {
1299                 usb_set_interface(subs->dev, subs->interface, 0);
1300                 subs->interface = -1;
1301                 subs->format = 0;
1302         }
1303
1304         /* set interface */
1305         if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
1306                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
1307                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
1308                                    dev->devnum, fmt->iface, fmt->altsetting);
1309                         return -EIO;
1310                 }
1311                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
1312                 subs->interface = fmt->iface;
1313                 subs->format = fmt->altset_idx;
1314         }
1315
1316         /* create a data pipe */
1317         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
1318         if (is_playback)
1319                 subs->datapipe = usb_sndisocpipe(dev, ep);
1320         else
1321                 subs->datapipe = usb_rcvisocpipe(dev, ep);
1322         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH &&
1323             get_endpoint(alts, 0)->bInterval >= 1 &&
1324             get_endpoint(alts, 0)->bInterval <= 4)
1325                 subs->datainterval = get_endpoint(alts, 0)->bInterval - 1;
1326         else
1327                 subs->datainterval = 0;
1328         subs->syncpipe = subs->syncinterval = 0;
1329         subs->maxpacksize = fmt->maxpacksize;
1330         subs->fill_max = 0;
1331
1332         /* we need a sync pipe in async OUT or adaptive IN mode */
1333         /* check the number of EP, since some devices have broken
1334          * descriptors which fool us.  if it has only one EP,
1335          * assume it as adaptive-out or sync-in.
1336          */
1337         attr = fmt->ep_attr & EP_ATTR_MASK;
1338         if (((is_playback && attr == EP_ATTR_ASYNC) ||
1339              (! is_playback && attr == EP_ATTR_ADAPTIVE)) &&
1340             altsd->bNumEndpoints >= 2) {
1341                 /* check sync-pipe endpoint */
1342                 /* ... and check descriptor size before accessing bSynchAddress
1343                    because there is a version of the SB Audigy 2 NX firmware lacking
1344                    the audio fields in the endpoint descriptors */
1345                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
1346                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1347                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
1348                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1349                                    dev->devnum, fmt->iface, fmt->altsetting);
1350                         return -EINVAL;
1351                 }
1352                 ep = get_endpoint(alts, 1)->bEndpointAddress;
1353                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1354                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
1355                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
1356                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1357                                    dev->devnum, fmt->iface, fmt->altsetting);
1358                         return -EINVAL;
1359                 }
1360                 ep &= USB_ENDPOINT_NUMBER_MASK;
1361                 if (is_playback)
1362                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
1363                 else
1364                         subs->syncpipe = usb_sndisocpipe(dev, ep);
1365                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1366                     get_endpoint(alts, 1)->bRefresh >= 1 &&
1367                     get_endpoint(alts, 1)->bRefresh <= 9)
1368                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
1369                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1370                         subs->syncinterval = 1;
1371                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
1372                          get_endpoint(alts, 1)->bInterval <= 16)
1373                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
1374                 else
1375                         subs->syncinterval = 3;
1376         }
1377
1378         /* always fill max packet size */
1379         if (fmt->attributes & EP_CS_ATTR_FILL_MAX)
1380                 subs->fill_max = 1;
1381
1382         if ((err = init_usb_pitch(dev, subs->interface, alts, fmt)) < 0)
1383                 return err;
1384
1385         subs->cur_audiofmt = fmt;
1386
1387 #if 0
1388         printk("setting done: format = %d, rate = %d, channels = %d\n",
1389                fmt->format, fmt->rate, fmt->channels);
1390         printk("  datapipe = 0x%0x, syncpipe = 0x%0x\n",
1391                subs->datapipe, subs->syncpipe);
1392 #endif
1393
1394         return 0;
1395 }
1396
1397 /*
1398  * hw_params callback
1399  *
1400  * allocate a buffer and set the given audio format.
1401  *
1402  * so far we use a physically linear buffer although packetize transfer
1403  * doesn't need a continuous area.
1404  * if sg buffer is supported on the later version of alsa, we'll follow
1405  * that.
1406  */
1407 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
1408                              struct snd_pcm_hw_params *hw_params)
1409 {
1410         struct snd_usb_substream *subs = (struct snd_usb_substream *)substream->runtime->private_data;
1411         struct audioformat *fmt;
1412         unsigned int channels, rate, format;
1413         int ret, changed;
1414
1415         ret = snd_pcm_alloc_vmalloc_buffer(substream,
1416                                            params_buffer_bytes(hw_params));
1417         if (ret < 0)
1418                 return ret;
1419
1420         format = params_format(hw_params);
1421         rate = params_rate(hw_params);
1422         channels = params_channels(hw_params);
1423         fmt = find_format(subs, format, rate, channels);
1424         if (! fmt) {
1425                 snd_printd(KERN_DEBUG "cannot set format: format = 0x%x, rate = %d, channels = %d\n",
1426                            format, rate, channels);
1427                 return -EINVAL;
1428         }
1429
1430         changed = subs->cur_audiofmt != fmt ||
1431                 subs->period_bytes != params_period_bytes(hw_params) ||
1432                 subs->cur_rate != rate;
1433         if ((ret = set_format(subs, fmt)) < 0)
1434                 return ret;
1435
1436         if (subs->cur_rate != rate) {
1437                 struct usb_host_interface *alts;
1438                 struct usb_interface *iface;
1439                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
1440                 alts = &iface->altsetting[fmt->altset_idx];
1441                 ret = init_usb_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
1442                 if (ret < 0)
1443                         return ret;
1444                 subs->cur_rate = rate;
1445         }
1446
1447         if (changed) {
1448                 /* format changed */
1449                 release_substream_urbs(subs, 0);
1450                 /* influenced: period_bytes, channels, rate, format, */
1451                 ret = init_substream_urbs(subs, params_period_bytes(hw_params),
1452                                           params_rate(hw_params),
1453                                           snd_pcm_format_physical_width(params_format(hw_params)) * params_channels(hw_params));
1454         }
1455
1456         return ret;
1457 }
1458
1459 /*
1460  * hw_free callback
1461  *
1462  * reset the audio format and release the buffer
1463  */
1464 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
1465 {
1466         struct snd_usb_substream *subs = (struct snd_usb_substream *)substream->runtime->private_data;
1467
1468         subs->cur_audiofmt = NULL;
1469         subs->cur_rate = 0;
1470         subs->period_bytes = 0;
1471         release_substream_urbs(subs, 0);
1472         return snd_pcm_free_vmalloc_buffer(substream);
1473 }
1474
1475 /*
1476  * prepare callback
1477  *
1478  * only a few subtle things...
1479  */
1480 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
1481 {
1482         struct snd_pcm_runtime *runtime = substream->runtime;
1483         struct snd_usb_substream *subs = runtime->private_data;
1484
1485         if (! subs->cur_audiofmt) {
1486                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
1487                 return -ENXIO;
1488         }
1489
1490         /* some unit conversions in runtime */
1491         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
1492         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
1493
1494         /* reset the pointer */
1495         subs->hwptr_done = 0;
1496         subs->transfer_done = 0;
1497         subs->phase = 0;
1498
1499         /* clear urbs (to be sure) */
1500         deactivate_urbs(subs, 0, 1);
1501         wait_clear_urbs(subs);
1502
1503         /* for playback, submit the URBs now; otherwise, the first hwptr_done
1504          * updates for all URBs would happen at the same time when starting */
1505         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1506                 subs->ops.prepare = prepare_startup_playback_urb;
1507                 return start_urbs(subs, runtime);
1508         } else
1509                 return 0;
1510 }
1511
1512 static struct snd_pcm_hardware snd_usb_playback =
1513 {
1514         .info =                 SNDRV_PCM_INFO_MMAP |
1515                                 SNDRV_PCM_INFO_MMAP_VALID |
1516                                 SNDRV_PCM_INFO_BATCH |
1517                                 SNDRV_PCM_INFO_INTERLEAVED |
1518                                 SNDRV_PCM_INFO_BLOCK_TRANSFER,
1519         .buffer_bytes_max =     1024 * 1024,
1520         .period_bytes_min =     64,
1521         .period_bytes_max =     512 * 1024,
1522         .periods_min =          2,
1523         .periods_max =          1024,
1524 };
1525
1526 static struct snd_pcm_hardware snd_usb_capture =
1527 {
1528         .info =                 SNDRV_PCM_INFO_MMAP |
1529                                 SNDRV_PCM_INFO_MMAP_VALID |
1530                                 SNDRV_PCM_INFO_BATCH |
1531                                 SNDRV_PCM_INFO_INTERLEAVED |
1532                                 SNDRV_PCM_INFO_BLOCK_TRANSFER,
1533         .buffer_bytes_max =     1024 * 1024,
1534         .period_bytes_min =     64,
1535         .period_bytes_max =     512 * 1024,
1536         .periods_min =          2,
1537         .periods_max =          1024,
1538 };
1539
1540 /*
1541  * h/w constraints
1542  */
1543
1544 #ifdef HW_CONST_DEBUG
1545 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
1546 #else
1547 #define hwc_debug(fmt, args...) /**/
1548 #endif
1549
1550 static int hw_check_valid_format(struct snd_pcm_hw_params *params, struct audioformat *fp)
1551 {
1552         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1553         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1554         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1555
1556         /* check the format */
1557         if (! snd_mask_test(fmts, fp->format)) {
1558                 hwc_debug("   > check: no supported format %d\n", fp->format);
1559                 return 0;
1560         }
1561         /* check the channels */
1562         if (fp->channels < ct->min || fp->channels > ct->max) {
1563                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1564                 return 0;
1565         }
1566         /* check the rate is within the range */
1567         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1568                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1569                 return 0;
1570         }
1571         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1572                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1573                 return 0;
1574         }
1575         return 1;
1576 }
1577
1578 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1579                         struct snd_pcm_hw_rule *rule)
1580 {
1581         struct snd_usb_substream *subs = rule->private;
1582         struct list_head *p;
1583         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1584         unsigned int rmin, rmax;
1585         int changed;
1586
1587         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1588         changed = 0;
1589         rmin = rmax = 0;
1590         list_for_each(p, &subs->fmt_list) {
1591                 struct audioformat *fp;
1592                 fp = list_entry(p, struct audioformat, list);
1593                 if (! hw_check_valid_format(params, fp))
1594                         continue;
1595                 if (changed++) {
1596                         if (rmin > fp->rate_min)
1597                                 rmin = fp->rate_min;
1598                         if (rmax < fp->rate_max)
1599                                 rmax = fp->rate_max;
1600                 } else {
1601                         rmin = fp->rate_min;
1602                         rmax = fp->rate_max;
1603                 }
1604         }
1605
1606         if (! changed) {
1607                 hwc_debug("  --> get empty\n");
1608                 it->empty = 1;
1609                 return -EINVAL;
1610         }
1611
1612         changed = 0;
1613         if (it->min < rmin) {
1614                 it->min = rmin;
1615                 it->openmin = 0;
1616                 changed = 1;
1617         }
1618         if (it->max > rmax) {
1619                 it->max = rmax;
1620                 it->openmax = 0;
1621                 changed = 1;
1622         }
1623         if (snd_interval_checkempty(it)) {
1624                 it->empty = 1;
1625                 return -EINVAL;
1626         }
1627         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1628         return changed;
1629 }
1630
1631
1632 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1633                             struct snd_pcm_hw_rule *rule)
1634 {
1635         struct snd_usb_substream *subs = rule->private;
1636         struct list_head *p;
1637         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1638         unsigned int rmin, rmax;
1639         int changed;
1640
1641         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1642         changed = 0;
1643         rmin = rmax = 0;
1644         list_for_each(p, &subs->fmt_list) {
1645                 struct audioformat *fp;
1646                 fp = list_entry(p, struct audioformat, list);
1647                 if (! hw_check_valid_format(params, fp))
1648                         continue;
1649                 if (changed++) {
1650                         if (rmin > fp->channels)
1651                                 rmin = fp->channels;
1652                         if (rmax < fp->channels)
1653                                 rmax = fp->channels;
1654                 } else {
1655                         rmin = fp->channels;
1656                         rmax = fp->channels;
1657                 }
1658         }
1659
1660         if (! changed) {
1661                 hwc_debug("  --> get empty\n");
1662                 it->empty = 1;
1663                 return -EINVAL;
1664         }
1665
1666         changed = 0;
1667         if (it->min < rmin) {
1668                 it->min = rmin;
1669                 it->openmin = 0;
1670                 changed = 1;
1671         }
1672         if (it->max > rmax) {
1673                 it->max = rmax;
1674                 it->openmax = 0;
1675                 changed = 1;
1676         }
1677         if (snd_interval_checkempty(it)) {
1678                 it->empty = 1;
1679                 return -EINVAL;
1680         }
1681         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1682         return changed;
1683 }
1684
1685 static int hw_rule_format(struct snd_pcm_hw_params *params,
1686                           struct snd_pcm_hw_rule *rule)
1687 {
1688         struct snd_usb_substream *subs = rule->private;
1689         struct list_head *p;
1690         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1691         u64 fbits;
1692         u32 oldbits[2];
1693         int changed;
1694
1695         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1696         fbits = 0;
1697         list_for_each(p, &subs->fmt_list) {
1698                 struct audioformat *fp;
1699                 fp = list_entry(p, struct audioformat, list);
1700                 if (! hw_check_valid_format(params, fp))
1701                         continue;
1702                 fbits |= (1ULL << fp->format);
1703         }
1704
1705         oldbits[0] = fmt->bits[0];
1706         oldbits[1] = fmt->bits[1];
1707         fmt->bits[0] &= (u32)fbits;
1708         fmt->bits[1] &= (u32)(fbits >> 32);
1709         if (! fmt->bits[0] && ! fmt->bits[1]) {
1710                 hwc_debug("  --> get empty\n");
1711                 return -EINVAL;
1712         }
1713         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1714         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1715         return changed;
1716 }
1717
1718 #define MAX_MASK        64
1719
1720 /*
1721  * check whether the registered audio formats need special hw-constraints
1722  */
1723 static int check_hw_params_convention(struct snd_usb_substream *subs)
1724 {
1725         int i;
1726         u32 *channels;
1727         u32 *rates;
1728         u32 cmaster, rmaster;
1729         u32 rate_min = 0, rate_max = 0;
1730         struct list_head *p;
1731         int err = 1;
1732
1733         channels = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
1734         rates = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
1735
1736         list_for_each(p, &subs->fmt_list) {
1737                 struct audioformat *f;
1738                 f = list_entry(p, struct audioformat, list);
1739                 /* unconventional channels? */
1740                 if (f->channels > 32)
1741                         goto __out;
1742                 /* continuous rate min/max matches? */
1743                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
1744                         if (rate_min && f->rate_min != rate_min)
1745                                 goto __out;
1746                         if (rate_max && f->rate_max != rate_max)
1747                                 goto __out;
1748                         rate_min = f->rate_min;
1749                         rate_max = f->rate_max;
1750                 }
1751                 /* combination of continuous rates and fixed rates? */
1752                 if (rates[f->format] & SNDRV_PCM_RATE_CONTINUOUS) {
1753                         if (f->rates != rates[f->format])
1754                                 goto __out;
1755                 }
1756                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
1757                         if (rates[f->format] && rates[f->format] != f->rates)
1758                                 goto __out;
1759                 }
1760                 channels[f->format] |= (1 << f->channels);
1761                 rates[f->format] |= f->rates;
1762         }
1763         /* check whether channels and rates match for all formats */
1764         cmaster = rmaster = 0;
1765         for (i = 0; i < MAX_MASK; i++) {
1766                 if (cmaster != channels[i] && cmaster && channels[i])
1767                         goto __out;
1768                 if (rmaster != rates[i] && rmaster && rates[i])
1769                         goto __out;
1770                 if (channels[i])
1771                         cmaster = channels[i];
1772                 if (rates[i])
1773                         rmaster = rates[i];
1774         }
1775         /* check whether channels match for all distinct rates */
1776         memset(channels, 0, MAX_MASK * sizeof(u32));
1777         list_for_each(p, &subs->fmt_list) {
1778                 struct audioformat *f;
1779                 f = list_entry(p, struct audioformat, list);
1780                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS)
1781                         continue;
1782                 for (i = 0; i < 32; i++) {
1783                         if (f->rates & (1 << i))
1784                                 channels[i] |= (1 << f->channels);
1785                 }
1786         }
1787         cmaster = 0;
1788         for (i = 0; i < 32; i++) {
1789                 if (cmaster != channels[i] && cmaster && channels[i])
1790                         goto __out;
1791                 if (channels[i])
1792                         cmaster = channels[i];
1793         }
1794         err = 0;
1795
1796  __out:
1797         kfree(channels);
1798         kfree(rates);
1799         return err;
1800 }
1801
1802
1803 /*
1804  * set up the runtime hardware information.
1805  */
1806
1807 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1808 {
1809         struct list_head *p;
1810         int err;
1811
1812         runtime->hw.formats = subs->formats;
1813
1814         runtime->hw.rate_min = 0x7fffffff;
1815         runtime->hw.rate_max = 0;
1816         runtime->hw.channels_min = 256;
1817         runtime->hw.channels_max = 0;
1818         runtime->hw.rates = 0;
1819         /* check min/max rates and channels */
1820         list_for_each(p, &subs->fmt_list) {
1821                 struct audioformat *fp;
1822                 fp = list_entry(p, struct audioformat, list);
1823                 runtime->hw.rates |= fp->rates;
1824                 if (runtime->hw.rate_min > fp->rate_min)
1825                         runtime->hw.rate_min = fp->rate_min;
1826                 if (runtime->hw.rate_max < fp->rate_max)
1827                         runtime->hw.rate_max = fp->rate_max;
1828                 if (runtime->hw.channels_min > fp->channels)
1829                         runtime->hw.channels_min = fp->channels;
1830                 if (runtime->hw.channels_max < fp->channels)
1831                         runtime->hw.channels_max = fp->channels;
1832                 if (fp->fmt_type == USB_FORMAT_TYPE_II && fp->frame_size > 0) {
1833                         /* FIXME: there might be more than one audio formats... */
1834                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1835                                 fp->frame_size;
1836                 }
1837         }
1838
1839         /* set the period time minimum 1ms */
1840         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1841                                      1000 * MIN_PACKS_URB,
1842                                      /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);
1843
1844         if (check_hw_params_convention(subs)) {
1845                 hwc_debug("setting extra hw constraints...\n");
1846                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1847                                                hw_rule_rate, subs,
1848                                                SNDRV_PCM_HW_PARAM_FORMAT,
1849                                                SNDRV_PCM_HW_PARAM_CHANNELS,
1850                                                -1)) < 0)
1851                         return err;
1852                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1853                                                hw_rule_channels, subs,
1854                                                SNDRV_PCM_HW_PARAM_FORMAT,
1855                                                SNDRV_PCM_HW_PARAM_RATE,
1856                                                -1)) < 0)
1857                         return err;
1858                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1859                                                hw_rule_format, subs,
1860                                                SNDRV_PCM_HW_PARAM_RATE,
1861                                                SNDRV_PCM_HW_PARAM_CHANNELS,
1862                                                -1)) < 0)
1863                         return err;
1864         }
1865         return 0;
1866 }
1867
1868 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction,
1869                             struct snd_pcm_hardware *hw)
1870 {
1871         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1872         struct snd_pcm_runtime *runtime = substream->runtime;
1873         struct snd_usb_substream *subs = &as->substream[direction];
1874
1875         subs->interface = -1;
1876         subs->format = 0;
1877         runtime->hw = *hw;
1878         runtime->private_data = subs;
1879         subs->pcm_substream = substream;
1880         return setup_hw_info(runtime, subs);
1881 }
1882
1883 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1884 {
1885         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1886         struct snd_usb_substream *subs = &as->substream[direction];
1887
1888         if (subs->interface >= 0) {
1889                 usb_set_interface(subs->dev, subs->interface, 0);
1890                 subs->interface = -1;
1891         }
1892         subs->pcm_substream = NULL;
1893         return 0;
1894 }
1895
1896 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1897 {
1898         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK, &snd_usb_playback);
1899 }
1900
1901 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1902 {
1903         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1904 }
1905
1906 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1907 {
1908         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE, &snd_usb_capture);
1909 }
1910
1911 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1912 {
1913         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1914 }
1915
1916 static struct snd_pcm_ops snd_usb_playback_ops = {
1917         .open =         snd_usb_playback_open,
1918         .close =        snd_usb_playback_close,
1919         .ioctl =        snd_pcm_lib_ioctl,
1920         .hw_params =    snd_usb_hw_params,
1921         .hw_free =      snd_usb_hw_free,
1922         .prepare =      snd_usb_pcm_prepare,
1923         .trigger =      snd_usb_pcm_playback_trigger,
1924         .pointer =      snd_usb_pcm_pointer,
1925         .page =         snd_pcm_get_vmalloc_page,
1926 };
1927
1928 static struct snd_pcm_ops snd_usb_capture_ops = {
1929         .open =         snd_usb_capture_open,
1930         .close =        snd_usb_capture_close,
1931         .ioctl =        snd_pcm_lib_ioctl,
1932         .hw_params =    snd_usb_hw_params,
1933         .hw_free =      snd_usb_hw_free,
1934         .prepare =      snd_usb_pcm_prepare,
1935         .trigger =      snd_usb_pcm_capture_trigger,
1936         .pointer =      snd_usb_pcm_pointer,
1937         .page =         snd_pcm_get_vmalloc_page,
1938 };
1939
1940
1941
1942 /*
1943  * helper functions
1944  */
1945
1946 /*
1947  * combine bytes and get an integer value
1948  */
1949 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
1950 {
1951         switch (size) {
1952         case 1:  return *bytes;
1953         case 2:  return combine_word(bytes);
1954         case 3:  return combine_triple(bytes);
1955         case 4:  return combine_quad(bytes);
1956         default: return 0;
1957         }
1958 }
1959
1960 /*
1961  * parse descriptor buffer and return the pointer starting the given
1962  * descriptor type.
1963  */
1964 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
1965 {
1966         u8 *p, *end, *next;
1967
1968         p = descstart;
1969         end = p + desclen;
1970         for (; p < end;) {
1971                 if (p[0] < 2)
1972                         return NULL;
1973                 next = p + p[0];
1974                 if (next > end)
1975                         return NULL;
1976                 if (p[1] == dtype && (!after || (void *)p > after)) {
1977                         return p;
1978                 }
1979                 p = next;
1980         }
1981         return NULL;
1982 }
1983
1984 /*
1985  * find a class-specified interface descriptor with the given subtype.
1986  */
1987 void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
1988 {
1989         unsigned char *p = after;
1990
1991         while ((p = snd_usb_find_desc(buffer, buflen, p,
1992                                       USB_DT_CS_INTERFACE)) != NULL) {
1993                 if (p[0] >= 3 && p[2] == dsubtype)
1994                         return p;
1995         }
1996         return NULL;
1997 }
1998
1999 /*
2000  * Wrapper for usb_control_msg().
2001  * Allocates a temp buffer to prevent dmaing from/to the stack.
2002  */
2003 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
2004                     __u8 requesttype, __u16 value, __u16 index, void *data,
2005                     __u16 size, int timeout)
2006 {
2007         int err;
2008         void *buf = NULL;
2009
2010         if (size > 0) {
2011                 buf = kmalloc(size, GFP_KERNEL);
2012                 if (!buf)
2013                         return -ENOMEM;
2014                 memcpy(buf, data, size);
2015         }
2016         err = usb_control_msg(dev, pipe, request, requesttype,
2017                               value, index, buf, size, timeout);
2018         if (size > 0) {
2019                 memcpy(data, buf, size);
2020                 kfree(buf);
2021         }
2022         return err;
2023 }
2024
2025
2026 /*
2027  * entry point for linux usb interface
2028  */
2029
2030 static int usb_audio_probe(struct usb_interface *intf,
2031                            const struct usb_device_id *id);
2032 static void usb_audio_disconnect(struct usb_interface *intf);
2033
2034 static struct usb_device_id usb_audio_ids [] = {
2035 #include "usbquirks.h"
2036     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
2037       .bInterfaceClass = USB_CLASS_AUDIO,
2038       .bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL },
2039     { }                                         /* Terminating entry */
2040 };
2041
2042 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
2043
2044 static struct usb_driver usb_audio_driver = {
2045         .name =         "snd-usb-audio",
2046         .probe =        usb_audio_probe,
2047         .disconnect =   usb_audio_disconnect,
2048         .id_table =     usb_audio_ids,
2049 };
2050
2051
2052 #if defined(CONFIG_PROCFS) && defined(CONFIG_SND_VERBOSE_PROCFS)
2053
2054 /*
2055  * proc interface for list the supported pcm formats
2056  */
2057 static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2058 {
2059         struct list_head *p;
2060         static char *sync_types[4] = {
2061                 "NONE", "ASYNC", "ADAPTIVE", "SYNC"
2062         };
2063
2064         list_for_each(p, &subs->fmt_list) {
2065                 struct audioformat *fp;
2066                 fp = list_entry(p, struct audioformat, list);
2067                 snd_iprintf(buffer, "  Interface %d\n", fp->iface);
2068                 snd_iprintf(buffer, "    Altset %d\n", fp->altsetting);
2069                 snd_iprintf(buffer, "    Format: 0x%x\n", fp->format);
2070                 snd_iprintf(buffer, "    Channels: %d\n", fp->channels);
2071                 snd_iprintf(buffer, "    Endpoint: %d %s (%s)\n",
2072                             fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
2073                             fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
2074                             sync_types[(fp->ep_attr & EP_ATTR_MASK) >> 2]);
2075                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
2076                         snd_iprintf(buffer, "    Rates: %d - %d (continuous)\n",
2077                                     fp->rate_min, fp->rate_max);
2078                 } else {
2079                         unsigned int i;
2080                         snd_iprintf(buffer, "    Rates: ");
2081                         for (i = 0; i < fp->nr_rates; i++) {
2082                                 if (i > 0)
2083                                         snd_iprintf(buffer, ", ");
2084                                 snd_iprintf(buffer, "%d", fp->rate_table[i]);
2085                         }
2086                         snd_iprintf(buffer, "\n");
2087                 }
2088                 // snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
2089                 // snd_iprintf(buffer, "    EP Attribute = 0x%x\n", fp->attributes);
2090         }
2091 }
2092
2093 static void proc_dump_substream_status(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2094 {
2095         if (subs->running) {
2096                 unsigned int i;
2097                 snd_iprintf(buffer, "  Status: Running\n");
2098                 snd_iprintf(buffer, "    Interface = %d\n", subs->interface);
2099                 snd_iprintf(buffer, "    Altset = %d\n", subs->format);
2100                 snd_iprintf(buffer, "    URBs = %d [ ", subs->nurbs);
2101                 for (i = 0; i < subs->nurbs; i++)
2102                         snd_iprintf(buffer, "%d ", subs->dataurb[i].packets);
2103                 snd_iprintf(buffer, "]\n");
2104                 snd_iprintf(buffer, "    Packet Size = %d\n", subs->curpacksize);
2105                 snd_iprintf(buffer, "    Momentary freq = %u Hz (%#x.%04x)\n",
2106                             snd_usb_get_speed(subs->dev) == USB_SPEED_FULL
2107                             ? get_full_speed_hz(subs->freqm)
2108                             : get_high_speed_hz(subs->freqm),
2109                             subs->freqm >> 16, subs->freqm & 0xffff);
2110         } else {
2111                 snd_iprintf(buffer, "  Status: Stop\n");
2112         }
2113 }
2114
2115 static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
2116 {
2117         struct snd_usb_stream *stream = entry->private_data;
2118
2119         snd_iprintf(buffer, "%s : %s\n", stream->chip->card->longname, stream->pcm->name);
2120
2121         if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
2122                 snd_iprintf(buffer, "\nPlayback:\n");
2123                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2124                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2125         }
2126         if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
2127                 snd_iprintf(buffer, "\nCapture:\n");
2128                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2129                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2130         }
2131 }
2132
2133 static void proc_pcm_format_add(struct snd_usb_stream *stream)
2134 {
2135         struct snd_info_entry *entry;
2136         char name[32];
2137         struct snd_card *card = stream->chip->card;
2138
2139         sprintf(name, "stream%d", stream->pcm_index);
2140         if (! snd_card_proc_new(card, name, &entry))
2141                 snd_info_set_text_ops(entry, stream, proc_pcm_format_read);
2142 }
2143
2144 #else
2145
2146 static inline void proc_pcm_format_add(struct snd_usb_stream *stream)
2147 {
2148 }
2149
2150 #endif
2151
2152 /*
2153  * initialize the substream instance.
2154  */
2155
2156 static void init_substream(struct snd_usb_stream *as, int stream, struct audioformat *fp)
2157 {
2158         struct snd_usb_substream *subs = &as->substream[stream];
2159
2160         INIT_LIST_HEAD(&subs->fmt_list);
2161         spin_lock_init(&subs->lock);
2162
2163         subs->stream = as;
2164         subs->direction = stream;
2165         subs->dev = as->chip->dev;
2166         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
2167                 subs->ops = audio_urb_ops[stream];
2168         else
2169                 subs->ops = audio_urb_ops_high_speed[stream];
2170         snd_pcm_set_ops(as->pcm, stream,
2171                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
2172                         &snd_usb_playback_ops : &snd_usb_capture_ops);
2173
2174         list_add_tail(&fp->list, &subs->fmt_list);
2175         subs->formats |= 1ULL << fp->format;
2176         subs->endpoint = fp->endpoint;
2177         subs->num_formats++;
2178         subs->fmt_type = fp->fmt_type;
2179 }
2180
2181
2182 /*
2183  * free a substream
2184  */
2185 static void free_substream(struct snd_usb_substream *subs)
2186 {
2187         struct list_head *p, *n;
2188
2189         if (! subs->num_formats)
2190                 return; /* not initialized */
2191         list_for_each_safe(p, n, &subs->fmt_list) {
2192                 struct audioformat *fp = list_entry(p, struct audioformat, list);
2193                 kfree(fp->rate_table);
2194                 kfree(fp);
2195         }
2196 }
2197
2198
2199 /*
2200  * free a usb stream instance
2201  */
2202 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
2203 {
2204         free_substream(&stream->substream[0]);
2205         free_substream(&stream->substream[1]);
2206         list_del(&stream->list);
2207         kfree(stream);
2208 }
2209
2210 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
2211 {
2212         struct snd_usb_stream *stream = pcm->private_data;
2213         if (stream) {
2214                 stream->pcm = NULL;
2215                 snd_usb_audio_stream_free(stream);
2216         }
2217 }
2218
2219
2220 /*
2221  * add this endpoint to the chip instance.
2222  * if a stream with the same endpoint already exists, append to it.
2223  * if not, create a new pcm stream.
2224  */
2225 static int add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
2226 {
2227         struct list_head *p;
2228         struct snd_usb_stream *as;
2229         struct snd_usb_substream *subs;
2230         struct snd_pcm *pcm;
2231         int err;
2232
2233         list_for_each(p, &chip->pcm_list) {
2234                 as = list_entry(p, struct snd_usb_stream, list);
2235                 if (as->fmt_type != fp->fmt_type)
2236                         continue;
2237                 subs = &as->substream[stream];
2238                 if (! subs->endpoint)
2239                         continue;
2240                 if (subs->endpoint == fp->endpoint) {
2241                         list_add_tail(&fp->list, &subs->fmt_list);
2242                         subs->num_formats++;
2243                         subs->formats |= 1ULL << fp->format;
2244                         return 0;
2245                 }
2246         }
2247         /* look for an empty stream */
2248         list_for_each(p, &chip->pcm_list) {
2249                 as = list_entry(p, struct snd_usb_stream, list);
2250                 if (as->fmt_type != fp->fmt_type)
2251                         continue;
2252                 subs = &as->substream[stream];
2253                 if (subs->endpoint)
2254                         continue;
2255                 err = snd_pcm_new_stream(as->pcm, stream, 1);
2256                 if (err < 0)
2257                         return err;
2258                 init_substream(as, stream, fp);
2259                 return 0;
2260         }
2261
2262         /* create a new pcm */
2263         as = kmalloc(sizeof(*as), GFP_KERNEL);
2264         if (! as)
2265                 return -ENOMEM;
2266         memset(as, 0, sizeof(*as));
2267         as->pcm_index = chip->pcm_devs;
2268         as->chip = chip;
2269         as->fmt_type = fp->fmt_type;
2270         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
2271                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
2272                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
2273                           &pcm);
2274         if (err < 0) {
2275                 kfree(as);
2276                 return err;
2277         }
2278         as->pcm = pcm;
2279         pcm->private_data = as;
2280         pcm->private_free = snd_usb_audio_pcm_free;
2281         pcm->info_flags = 0;
2282         if (chip->pcm_devs > 0)
2283                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
2284         else
2285                 strcpy(pcm->name, "USB Audio");
2286
2287         init_substream(as, stream, fp);
2288
2289         list_add(&as->list, &chip->pcm_list);
2290         chip->pcm_devs++;
2291
2292         proc_pcm_format_add(as);
2293
2294         return 0;
2295 }
2296
2297
2298 /*
2299  * check if the device uses big-endian samples
2300  */
2301 static int is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
2302 {
2303         switch (chip->usb_id) {
2304         case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
2305                 if (fp->endpoint & USB_DIR_IN)
2306                         return 1;
2307                 break;
2308         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2309                 return 1;
2310         }
2311         return 0;
2312 }
2313
2314 /*
2315  * parse the audio format type I descriptor
2316  * and returns the corresponding pcm format
2317  *
2318  * @dev: usb device
2319  * @fp: audioformat record
2320  * @format: the format tag (wFormatTag)
2321  * @fmt: the format type descriptor
2322  */
2323 static int parse_audio_format_i_type(struct snd_usb_audio *chip, struct audioformat *fp,
2324                                      int format, unsigned char *fmt)
2325 {
2326         int pcm_format;
2327         int sample_width, sample_bytes;
2328
2329         /* FIXME: correct endianess and sign? */
2330         pcm_format = -1;
2331         sample_width = fmt[6];
2332         sample_bytes = fmt[5];
2333         switch (format) {
2334         case 0: /* some devices don't define this correctly... */
2335                 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
2336                             chip->dev->devnum, fp->iface, fp->altsetting);
2337                 /* fall-through */
2338         case USB_AUDIO_FORMAT_PCM:
2339                 if (sample_width > sample_bytes * 8) {
2340                         snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
2341                                    chip->dev->devnum, fp->iface, fp->altsetting,
2342                                    sample_width, sample_bytes);
2343                 }
2344                 /* check the format byte size */
2345                 switch (fmt[5]) {
2346                 case 1:
2347                         pcm_format = SNDRV_PCM_FORMAT_S8;
2348                         break;
2349                 case 2:
2350                         if (is_big_endian_format(chip, fp))
2351                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE; /* grrr, big endian!! */
2352                         else
2353                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2354                         break;
2355                 case 3:
2356                         if (is_big_endian_format(chip, fp))
2357                                 pcm_format = SNDRV_PCM_FORMAT_S24_3BE; /* grrr, big endian!! */
2358                         else
2359                                 pcm_format = SNDRV_PCM_FORMAT_S24_3LE;
2360                         break;
2361                 case 4:
2362                         pcm_format = SNDRV_PCM_FORMAT_S32_LE;
2363                         break;
2364                 default:
2365                         snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
2366                                    chip->dev->devnum, fp->iface,
2367                                    fp->altsetting, sample_width, sample_bytes);
2368                         break;
2369                 }
2370                 break;
2371         case USB_AUDIO_FORMAT_PCM8:
2372                 /* Dallas DS4201 workaround */
2373                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2374                         pcm_format = SNDRV_PCM_FORMAT_S8;
2375                 else
2376                         pcm_format = SNDRV_PCM_FORMAT_U8;
2377                 break;
2378         case USB_AUDIO_FORMAT_IEEE_FLOAT:
2379                 pcm_format = SNDRV_PCM_FORMAT_FLOAT_LE;
2380                 break;
2381         case USB_AUDIO_FORMAT_ALAW:
2382                 pcm_format = SNDRV_PCM_FORMAT_A_LAW;
2383                 break;
2384         case USB_AUDIO_FORMAT_MU_LAW:
2385                 pcm_format = SNDRV_PCM_FORMAT_MU_LAW;
2386                 break;
2387         default:
2388                 snd_printk(KERN_INFO "%d:%u:%d : unsupported format type %d\n",
2389                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2390                 break;
2391         }
2392         return pcm_format;
2393 }
2394
2395
2396 /*
2397  * parse the format descriptor and stores the possible sample rates
2398  * on the audioformat table.
2399  *
2400  * @dev: usb device
2401  * @fp: audioformat record
2402  * @fmt: the format descriptor
2403  * @offset: the start offset of descriptor pointing the rate type
2404  *          (7 for type I and II, 8 for type II)
2405  */
2406 static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioformat *fp,
2407                                     unsigned char *fmt, int offset)
2408 {
2409         int nr_rates = fmt[offset];
2410         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
2411                 snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2412                                    chip->dev->devnum, fp->iface, fp->altsetting);
2413                 return -1;
2414         }
2415
2416         if (nr_rates) {
2417                 /*
2418                  * build the rate table and bitmap flags
2419                  */
2420                 int r, idx, c;
2421                 /* this table corresponds to the SNDRV_PCM_RATE_XXX bit */
2422                 static unsigned int conv_rates[] = {
2423                         5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
2424                         64000, 88200, 96000, 176400, 192000
2425                 };
2426                 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
2427                 if (fp->rate_table == NULL) {
2428                         snd_printk(KERN_ERR "cannot malloc\n");
2429                         return -1;
2430                 }
2431
2432                 fp->nr_rates = nr_rates;
2433                 fp->rate_min = fp->rate_max = combine_triple(&fmt[8]);
2434                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
2435                         unsigned int rate = fp->rate_table[r] = combine_triple(&fmt[idx]);
2436                         if (rate < fp->rate_min)
2437                                 fp->rate_min = rate;
2438                         else if (rate > fp->rate_max)
2439                                 fp->rate_max = rate;
2440                         for (c = 0; c < (int)ARRAY_SIZE(conv_rates); c++) {
2441                                 if (rate == conv_rates[c]) {
2442                                         fp->rates |= (1 << c);
2443                                         break;
2444                                 }
2445                         }
2446                 }
2447         } else {
2448                 /* continuous rates */
2449                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
2450                 fp->rate_min = combine_triple(&fmt[offset + 1]);
2451                 fp->rate_max = combine_triple(&fmt[offset + 4]);
2452         }
2453         return 0;
2454 }
2455
2456 /*
2457  * parse the format type I and III descriptors
2458  */
2459 static int parse_audio_format_i(struct snd_usb_audio *chip, struct audioformat *fp,
2460                                 int format, unsigned char *fmt)
2461 {
2462         int pcm_format;
2463
2464         if (fmt[3] == USB_FORMAT_TYPE_III) {
2465                 /* FIXME: the format type is really IECxxx
2466                  *        but we give normal PCM format to get the existing
2467                  *        apps working...
2468                  */
2469                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2470         } else {
2471                 pcm_format = parse_audio_format_i_type(chip, fp, format, fmt);
2472                 if (pcm_format < 0)
2473                         return -1;
2474         }
2475         fp->format = pcm_format;
2476         fp->channels = fmt[4];
2477         if (fp->channels < 1) {
2478                 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
2479                            chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
2480                 return -1;
2481         }
2482         return parse_audio_format_rates(chip, fp, fmt, 7);
2483 }
2484
2485 /*
2486  * prase the format type II descriptor
2487  */
2488 static int parse_audio_format_ii(struct snd_usb_audio *chip, struct audioformat *fp,
2489                                  int format, unsigned char *fmt)
2490 {
2491         int brate, framesize;
2492         switch (format) {
2493         case USB_AUDIO_FORMAT_AC3:
2494                 /* FIXME: there is no AC3 format defined yet */
2495                 // fp->format = SNDRV_PCM_FORMAT_AC3;
2496                 fp->format = SNDRV_PCM_FORMAT_U8; /* temporarily hack to receive byte streams */
2497                 break;
2498         case USB_AUDIO_FORMAT_MPEG:
2499                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2500                 break;
2501         default:
2502                 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag 0x%x is detected.  processed as MPEG.\n",
2503                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2504                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2505                 break;
2506         }
2507         fp->channels = 1;
2508         brate = combine_word(&fmt[4]);  /* fmt[4,5] : wMaxBitRate (in kbps) */
2509         framesize = combine_word(&fmt[6]); /* fmt[6,7]: wSamplesPerFrame */
2510         snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
2511         fp->frame_size = framesize;
2512         return parse_audio_format_rates(chip, fp, fmt, 8); /* fmt[8..] sample rates */
2513 }
2514
2515 static int parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
2516                               int format, unsigned char *fmt, int stream)
2517 {
2518         int err;
2519
2520         switch (fmt[3]) {
2521         case USB_FORMAT_TYPE_I:
2522         case USB_FORMAT_TYPE_III:
2523                 err = parse_audio_format_i(chip, fp, format, fmt);
2524                 break;
2525         case USB_FORMAT_TYPE_II:
2526                 err = parse_audio_format_ii(chip, fp, format, fmt);
2527                 break;
2528         default:
2529                 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
2530                            chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
2531                 return -1;
2532         }
2533         fp->fmt_type = fmt[3];
2534         if (err < 0)
2535                 return err;
2536 #if 1
2537         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
2538         /* extigy apparently supports sample rates other than 48k
2539          * but not in ordinary way.  so we enable only 48k atm.
2540          */
2541         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
2542             chip->usb_id == USB_ID(0x041e, 0x3020) ||
2543             chip->usb_id == USB_ID(0x041e, 0x3061)) {
2544                 if (fmt[3] == USB_FORMAT_TYPE_I &&
2545                     fp->rates != SNDRV_PCM_RATE_48000 &&
2546                     fp->rates != SNDRV_PCM_RATE_96000)
2547                         return -1;
2548         }
2549 #endif
2550         return 0;
2551 }
2552
2553 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
2554                                          int iface, int altno);
2555 static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2556 {
2557         struct usb_device *dev;
2558         struct usb_interface *iface;
2559         struct usb_host_interface *alts;
2560         struct usb_interface_descriptor *altsd;
2561         int i, altno, err, stream;
2562         int format;
2563         struct audioformat *fp;
2564         unsigned char *fmt, *csep;
2565
2566         dev = chip->dev;
2567
2568         /* parse the interface's altsettings */
2569         iface = usb_ifnum_to_if(dev, iface_no);
2570         for (i = 0; i < iface->num_altsetting; i++) {
2571                 alts = &iface->altsetting[i];
2572                 altsd = get_iface_desc(alts);
2573                 /* skip invalid one */
2574                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2575                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2576                     (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING &&
2577                      altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
2578                     altsd->bNumEndpoints < 1 ||
2579                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
2580                         continue;
2581                 /* must be isochronous */
2582                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2583                     USB_ENDPOINT_XFER_ISOC)
2584                         continue;
2585                 /* check direction */
2586                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
2587                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2588                 altno = altsd->bAlternateSetting;
2589         
2590                 /* audiophile usb: skip altsets incompatible with device_setup
2591                  */
2592                 if (chip->usb_id == USB_ID(0x0763, 0x2003) && 
2593                     audiophile_skip_setting_quirk(chip, iface_no, altno))
2594                         continue;
2595
2596                 /* get audio formats */
2597                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, AS_GENERAL);
2598                 if (!fmt) {
2599                         snd_printk(KERN_ERR "%d:%u:%d : AS_GENERAL descriptor not found\n",
2600                                    dev->devnum, iface_no, altno);
2601                         continue;
2602                 }
2603
2604                 if (fmt[0] < 7) {
2605                         snd_printk(KERN_ERR "%d:%u:%d : invalid AS_GENERAL desc\n",
2606                                    dev->devnum, iface_no, altno);
2607                         continue;
2608                 }
2609
2610                 format = (fmt[6] << 8) | fmt[5]; /* remember the format value */
2611
2612                 /* get format type */
2613                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, FORMAT_TYPE);
2614                 if (!fmt) {
2615                         snd_printk(KERN_ERR "%d:%u:%d : no FORMAT_TYPE desc\n",
2616                                    dev->devnum, iface_no, altno);
2617                         continue;
2618                 }
2619                 if (fmt[0] < 8) {
2620                         snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2621                                    dev->devnum, iface_no, altno);
2622                         continue;
2623                 }
2624
2625                 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
2626                 /* Creamware Noah has this descriptor after the 2nd endpoint */
2627                 if (!csep && altsd->bNumEndpoints >= 2)
2628                         csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
2629                 if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
2630                         snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
2631                                    " class specific endpoint descriptor\n",
2632                                    dev->devnum, iface_no, altno);
2633                         csep = NULL;
2634                 }
2635
2636                 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2637                 if (! fp) {
2638                         snd_printk(KERN_ERR "cannot malloc\n");
2639                         return -ENOMEM;
2640                 }
2641
2642                 memset(fp, 0, sizeof(*fp));
2643                 fp->iface = iface_no;
2644                 fp->altsetting = altno;
2645                 fp->altset_idx = i;
2646                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2647                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2648                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2649                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
2650                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
2651                                         * (fp->maxpacksize & 0x7ff);
2652                 fp->attributes = csep ? csep[3] : 0;
2653
2654                 /* some quirks for attributes here */
2655
2656                 switch (chip->usb_id) {
2657                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
2658                         /* Optoplay sets the sample rate attribute although
2659                          * it seems not supporting it in fact.
2660                          */
2661                         fp->attributes &= ~EP_CS_ATTR_SAMPLE_RATE;
2662                         break;
2663                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
2664                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2665                         /* doesn't set the sample rate attribute, but supports it */
2666                         fp->attributes |= EP_CS_ATTR_SAMPLE_RATE;
2667                         break;
2668                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
2669                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
2670                                                 an older model 77d:223) */
2671                 /*
2672                  * plantronics headset and Griffin iMic have set adaptive-in
2673                  * although it's really not...
2674                  */
2675                         fp->ep_attr &= ~EP_ATTR_MASK;
2676                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2677                                 fp->ep_attr |= EP_ATTR_ADAPTIVE;
2678                         else
2679                                 fp->ep_attr |= EP_ATTR_SYNC;
2680                         break;
2681                 }
2682
2683                 /* ok, let's parse further... */
2684                 if (parse_audio_format(chip, fp, format, fmt, stream) < 0) {
2685                         kfree(fp->rate_table);
2686                         kfree(fp);
2687                         continue;
2688                 }
2689
2690                 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint 0x%x\n", dev->devnum, iface_no, altno, fp->endpoint);
2691                 err = add_audio_endpoint(chip, stream, fp);
2692                 if (err < 0) {
2693                         kfree(fp->rate_table);
2694                         kfree(fp);
2695                         return err;
2696                 }
2697                 /* try to set the interface... */
2698                 usb_set_interface(chip->dev, iface_no, altno);
2699                 init_usb_pitch(chip->dev, iface_no, alts, fp);
2700                 init_usb_sample_rate(chip->dev, iface_no, alts, fp, fp->rate_max);
2701         }
2702         return 0;
2703 }
2704
2705
2706 /*
2707  * disconnect streams
2708  * called from snd_usb_audio_disconnect()
2709  */
2710 static void snd_usb_stream_disconnect(struct list_head *head)
2711 {
2712         int idx;
2713         struct snd_usb_stream *as;
2714         struct snd_usb_substream *subs;
2715
2716         as = list_entry(head, struct snd_usb_stream, list);
2717         for (idx = 0; idx < 2; idx++) {
2718                 subs = &as->substream[idx];
2719                 if (!subs->num_formats)
2720                         return;
2721                 release_substream_urbs(subs, 1);
2722                 subs->interface = -1;
2723         }
2724 }
2725
2726 /*
2727  * parse audio control descriptor and create pcm/midi streams
2728  */
2729 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
2730 {
2731         struct usb_device *dev = chip->dev;
2732         struct usb_host_interface *host_iface;
2733         struct usb_interface *iface;
2734         unsigned char *p1;
2735         int i, j;
2736
2737         /* find audiocontrol interface */
2738         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
2739         if (!(p1 = snd_usb_find_csint_desc(host_iface->extra, host_iface->extralen, NULL, HEADER))) {
2740                 snd_printk(KERN_ERR "cannot find HEADER\n");
2741                 return -EINVAL;
2742         }
2743         if (! p1[7] || p1[0] < 8 + p1[7]) {
2744                 snd_printk(KERN_ERR "invalid HEADER\n");
2745                 return -EINVAL;
2746         }
2747
2748         /*
2749          * parse all USB audio streaming interfaces
2750          */
2751         for (i = 0; i < p1[7]; i++) {
2752                 struct usb_host_interface *alts;
2753                 struct usb_interface_descriptor *altsd;
2754                 j = p1[8 + i];
2755                 iface = usb_ifnum_to_if(dev, j);
2756                 if (!iface) {
2757                         snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
2758                                    dev->devnum, ctrlif, j);
2759                         continue;
2760                 }
2761                 if (usb_interface_claimed(iface)) {
2762                         snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", dev->devnum, ctrlif, j);
2763                         continue;
2764                 }
2765                 alts = &iface->altsetting[0];
2766                 altsd = get_iface_desc(alts);
2767                 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
2768                      altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
2769                     altsd->bInterfaceSubClass == USB_SUBCLASS_MIDI_STREAMING) {
2770                         if (snd_usb_create_midi_interface(chip, iface, NULL) < 0) {
2771                                 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", dev->devnum, ctrlif, j);
2772                                 continue;
2773                         }
2774                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2775                         continue;
2776                 }
2777                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2778                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2779                     altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING) {
2780                         snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", dev->devnum, ctrlif, j, altsd->bInterfaceClass);
2781                         /* skip non-supported classes */
2782                         continue;
2783                 }
2784                 if (! parse_audio_endpoints(chip, j)) {
2785                         usb_set_interface(dev, j, 0); /* reset the current interface */
2786                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2787                 }
2788         }
2789
2790         return 0;
2791 }
2792
2793 /*
2794  * create a stream for an endpoint/altsetting without proper descriptors
2795  */
2796 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
2797                                      struct usb_interface *iface,
2798                                      const struct snd_usb_audio_quirk *quirk)
2799 {
2800         struct audioformat *fp;
2801         struct usb_host_interface *alts;
2802         int stream, err;
2803         int *rate_table = NULL;
2804
2805         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2806         if (! fp) {
2807                 snd_printk(KERN_ERR "cannot malloc\n");
2808                 return -ENOMEM;
2809         }
2810         memcpy(fp, quirk->data, sizeof(*fp));
2811         if (fp->nr_rates > 0) {
2812                 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
2813                 if (!rate_table) {
2814                         kfree(fp);
2815                         return -ENOMEM;
2816                 }
2817                 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
2818                 fp->rate_table = rate_table;
2819         }
2820
2821         stream = (fp->endpoint & USB_DIR_IN)
2822                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2823         err = add_audio_endpoint(chip, stream, fp);
2824         if (err < 0) {
2825                 kfree(fp);
2826                 kfree(rate_table);
2827                 return err;
2828         }
2829         if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
2830             fp->altset_idx >= iface->num_altsetting) {
2831                 kfree(fp);
2832                 kfree(rate_table);
2833                 return -EINVAL;
2834         }
2835         alts = &iface->altsetting[fp->altset_idx];
2836         usb_set_interface(chip->dev, fp->iface, 0);
2837         init_usb_pitch(chip->dev, fp->iface, alts, fp);
2838         init_usb_sample_rate(chip->dev, fp->iface, alts, fp, fp->rate_max);
2839         return 0;
2840 }
2841
2842 /*
2843  * create a stream for an interface with proper descriptors
2844  */
2845 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
2846                                        struct usb_interface *iface,
2847                                        const struct snd_usb_audio_quirk *quirk)
2848 {
2849         struct usb_host_interface *alts;
2850         struct usb_interface_descriptor *altsd;
2851         int err;
2852
2853         alts = &iface->altsetting[0];
2854         altsd = get_iface_desc(alts);
2855         err = parse_audio_endpoints(chip, altsd->bInterfaceNumber);
2856         if (err < 0) {
2857                 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
2858                            altsd->bInterfaceNumber, err);
2859                 return err;
2860         }
2861         /* reset the current interface */
2862         usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
2863         return 0;
2864 }
2865
2866 /*
2867  * Create a stream for an Edirol UA-700/UA-25 interface.  The only way
2868  * to detect the sample rate is by looking at wMaxPacketSize.
2869  */
2870 static int create_ua700_ua25_quirk(struct snd_usb_audio *chip,
2871                                    struct usb_interface *iface,
2872                                    const struct snd_usb_audio_quirk *quirk)
2873 {
2874         static const struct audioformat ua_format = {
2875                 .format = SNDRV_PCM_FORMAT_S24_3LE,
2876                 .channels = 2,
2877                 .fmt_type = USB_FORMAT_TYPE_I,
2878                 .altsetting = 1,
2879                 .altset_idx = 1,
2880                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
2881         };
2882         struct usb_host_interface *alts;
2883         struct usb_interface_descriptor *altsd;
2884         struct audioformat *fp;
2885         int stream, err;
2886
2887         /* both PCM and MIDI interfaces have 2 altsettings */
2888         if (iface->num_altsetting != 2)
2889                 return -ENXIO;
2890         alts = &iface->altsetting[1];
2891         altsd = get_iface_desc(alts);
2892
2893         if (altsd->bNumEndpoints == 2) {
2894                 static const struct snd_usb_midi_endpoint_info ua700_ep = {
2895                         .out_cables = 0x0003,
2896                         .in_cables  = 0x0003
2897                 };
2898                 static const struct snd_usb_audio_quirk ua700_quirk = {
2899                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
2900                         .data = &ua700_ep
2901                 };
2902                 static const struct snd_usb_midi_endpoint_info ua25_ep = {
2903                         .out_cables = 0x0001,
2904                         .in_cables  = 0x0001
2905                 };
2906                 static const struct snd_usb_audio_quirk ua25_quirk = {
2907                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
2908                         .data = &ua25_ep
2909                 };
2910                 if (chip->usb_id == USB_ID(0x0582, 0x002b))
2911                         return snd_usb_create_midi_interface(chip, iface,
2912                                                              &ua700_quirk);
2913                 else
2914                         return snd_usb_create_midi_interface(chip, iface,
2915                                                              &ua25_quirk);
2916         }
2917
2918         if (altsd->bNumEndpoints != 1)
2919                 return -ENXIO;
2920
2921         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2922         if (!fp)
2923                 return -ENOMEM;
2924         memcpy(fp, &ua_format, sizeof(*fp));
2925
2926         fp->iface = altsd->bInterfaceNumber;
2927         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2928         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2929         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2930
2931         switch (fp->maxpacksize) {
2932         case 0x120:
2933                 fp->rate_max = fp->rate_min = 44100;
2934                 break;
2935         case 0x138:
2936         case 0x140:
2937                 fp->rate_max = fp->rate_min = 48000;
2938                 break;
2939         case 0x258:
2940         case 0x260:
2941                 fp->rate_max = fp->rate_min = 96000;
2942                 break;
2943         default:
2944                 snd_printk(KERN_ERR "unknown sample rate\n");
2945                 kfree(fp);
2946                 return -ENXIO;
2947         }
2948
2949         stream = (fp->endpoint & USB_DIR_IN)
2950                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2951         err = add_audio_endpoint(chip, stream, fp);
2952         if (err < 0) {
2953                 kfree(fp);
2954                 return err;
2955         }
2956         usb_set_interface(chip->dev, fp->iface, 0);
2957         return 0;
2958 }
2959
2960 /*
2961  * Create a stream for an Edirol UA-1000 interface.
2962  */
2963 static int create_ua1000_quirk(struct snd_usb_audio *chip,
2964                                struct usb_interface *iface,
2965                                const struct snd_usb_audio_quirk *quirk)
2966 {
2967         static const struct audioformat ua1000_format = {
2968                 .format = SNDRV_PCM_FORMAT_S32_LE,
2969                 .fmt_type = USB_FORMAT_TYPE_I,
2970                 .altsetting = 1,
2971                 .altset_idx = 1,
2972                 .attributes = 0,
2973                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
2974         };
2975         struct usb_host_interface *alts;
2976         struct usb_interface_descriptor *altsd;
2977         struct audioformat *fp;
2978         int stream, err;
2979
2980         if (iface->num_altsetting != 2)
2981                 return -ENXIO;
2982         alts = &iface->altsetting[1];
2983         altsd = get_iface_desc(alts);
2984         if (alts->extralen != 11 || alts->extra[1] != USB_DT_CS_INTERFACE ||
2985             altsd->bNumEndpoints != 1)
2986                 return -ENXIO;
2987
2988         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2989         if (!fp)
2990                 return -ENOMEM;
2991         memcpy(fp, &ua1000_format, sizeof(*fp));
2992
2993         fp->channels = alts->extra[4];
2994         fp->iface = altsd->bInterfaceNumber;
2995         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2996         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2997         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2998         fp->rate_max = fp->rate_min = combine_triple(&alts->extra[8]);
2999
3000         stream = (fp->endpoint & USB_DIR_IN)
3001                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3002         err = add_audio_endpoint(chip, stream, fp);
3003         if (err < 0) {
3004                 kfree(fp);
3005                 return err;
3006         }
3007         /* FIXME: playback must be synchronized to capture */
3008         usb_set_interface(chip->dev, fp->iface, 0);
3009         return 0;
3010 }
3011
3012 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3013                                 struct usb_interface *iface,
3014                                 const struct snd_usb_audio_quirk *quirk);
3015
3016 /*
3017  * handle the quirks for the contained interfaces
3018  */
3019 static int create_composite_quirk(struct snd_usb_audio *chip,
3020                                   struct usb_interface *iface,
3021                                   const struct snd_usb_audio_quirk *quirk)
3022 {
3023         int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
3024         int err;
3025
3026         for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
3027                 iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
3028                 if (!iface)
3029                         continue;
3030                 if (quirk->ifnum != probed_ifnum &&
3031                     usb_interface_claimed(iface))
3032                         continue;
3033                 err = snd_usb_create_quirk(chip, iface, quirk);
3034                 if (err < 0)
3035                         return err;
3036                 if (quirk->ifnum != probed_ifnum)
3037                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
3038         }
3039         return 0;
3040 }
3041
3042 static int ignore_interface_quirk(struct snd_usb_audio *chip,
3043                                   struct usb_interface *iface,
3044                                   const struct snd_usb_audio_quirk *quirk)
3045 {
3046         return 0;
3047 }
3048
3049
3050 /*
3051  * boot quirks
3052  */
3053
3054 #define EXTIGY_FIRMWARE_SIZE_OLD 794
3055 #define EXTIGY_FIRMWARE_SIZE_NEW 483
3056
3057 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
3058 {
3059         struct usb_host_config *config = dev->actconfig;
3060         int err;
3061
3062         if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
3063             le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
3064                 snd_printdd("sending Extigy boot sequence...\n");
3065                 /* Send message to force it to reconnect with full interface. */
3066                 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
3067                                       0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
3068                 if (err < 0) snd_printdd("error sending boot message: %d\n", err);
3069                 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
3070                                 &dev->descriptor, sizeof(dev->descriptor));
3071                 config = dev->actconfig;
3072                 if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
3073                 err = usb_reset_configuration(dev);
3074                 if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
3075                 snd_printdd("extigy_boot: new boot length = %d\n",
3076                             le16_to_cpu(get_cfg_desc(config)->wTotalLength));
3077                 return -ENODEV; /* quit this anyway */
3078         }
3079         return 0;
3080 }
3081
3082 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
3083 {
3084         u8 buf = 1;
3085
3086         snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
3087                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3088                         0, 0, &buf, 1, 1000);
3089         if (buf == 0) {
3090                 snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
3091                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3092                                 1, 2000, NULL, 0, 1000);
3093                 return -ENODEV;
3094         }
3095         return 0;
3096 }
3097
3098 /*
3099  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
3100  * documented in the device's data sheet.
3101  */
3102 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
3103 {
3104         u8 buf[4];
3105         buf[0] = 0x20;
3106         buf[1] = value & 0xff;
3107         buf[2] = (value >> 8) & 0xff;
3108         buf[3] = reg;
3109         return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
3110                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
3111                                0, 0, &buf, 4, 1000);
3112 }
3113
3114 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
3115 {
3116         /*
3117          * Enable line-out driver mode, set headphone source to front
3118          * channels, enable stereo mic.
3119          */
3120         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
3121 }
3122
3123
3124 /*
3125  * Setup quirks
3126  */
3127 #define AUDIOPHILE_SET                  0x01 /* if set, parse device_setup */
3128 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
3129 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
3130 #define AUDIOPHILE_SET_24B              0x08 /* 24bits sample if set, 16bits otherwise */
3131 #define AUDIOPHILE_SET_DI               0x10 /* if set, enable Digital Input */
3132 #define AUDIOPHILE_SET_MASK             0x1F /* bit mask for setup value */
3133 #define AUDIOPHILE_SET_24B_48K_DI       0x19 /* value for 24bits+48KHz+Digital Input */
3134 #define AUDIOPHILE_SET_24B_48K_NOTDI    0x09 /* value for 24bits+48KHz+No Digital Input */
3135 #define AUDIOPHILE_SET_16B_48K_DI       0x11 /* value for 16bits+48KHz+Digital Input */
3136 #define AUDIOPHILE_SET_16B_48K_NOTDI    0x01 /* value for 16bits+48KHz+No Digital Input */
3137
3138 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
3139                                          int iface, int altno)
3140 {
3141         if (device_setup[chip->index] & AUDIOPHILE_SET) {
3142                 if ((device_setup[chip->index] & AUDIOPHILE_SET_DTS)
3143                     && altno != 6)
3144                         return 1; /* skip this altsetting */
3145                 if ((device_setup[chip->index] & AUDIOPHILE_SET_96K)
3146                     && altno != 1)
3147                         return 1; /* skip this altsetting */
3148                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3149                     AUDIOPHILE_SET_24B_48K_DI && altno != 2)
3150                         return 1; /* skip this altsetting */
3151                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3152                     AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
3153                         return 1; /* skip this altsetting */
3154                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3155                     AUDIOPHILE_SET_16B_48K_DI && altno != 4)
3156                         return 1; /* skip this altsetting */
3157                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3158                     AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
3159                         return 1; /* skip this altsetting */
3160         }       
3161         return 0; /* keep this altsetting */
3162 }
3163
3164 /*
3165  * audio-interface quirks
3166  *
3167  * returns zero if no standard audio/MIDI parsing is needed.
3168  * returns a postive value if standard audio/midi interfaces are parsed
3169  * after this.
3170  * returns a negative value at error.
3171  */
3172 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3173                                 struct usb_interface *iface,
3174                                 const struct snd_usb_audio_quirk *quirk)
3175 {
3176         typedef int (*quirk_func_t)(struct snd_usb_audio *, struct usb_interface *,
3177                                     const struct snd_usb_audio_quirk *);
3178         static const quirk_func_t quirk_funcs[] = {
3179                 [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
3180                 [QUIRK_COMPOSITE] = create_composite_quirk,
3181                 [QUIRK_MIDI_STANDARD_INTERFACE] = snd_usb_create_midi_interface,
3182                 [QUIRK_MIDI_FIXED_ENDPOINT] = snd_usb_create_midi_interface,
3183                 [QUIRK_MIDI_YAMAHA] = snd_usb_create_midi_interface,
3184                 [QUIRK_MIDI_MIDIMAN] = snd_usb_create_midi_interface,
3185                 [QUIRK_MIDI_NOVATION] = snd_usb_create_midi_interface,
3186                 [QUIRK_MIDI_RAW] = snd_usb_create_midi_interface,
3187                 [QUIRK_MIDI_EMAGIC] = snd_usb_create_midi_interface,
3188                 [QUIRK_MIDI_CME] = snd_usb_create_midi_interface,
3189                 [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
3190                 [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
3191                 [QUIRK_AUDIO_EDIROL_UA700_UA25] = create_ua700_ua25_quirk,
3192                 [QUIRK_AUDIO_EDIROL_UA1000] = create_ua1000_quirk,
3193         };
3194
3195         if (quirk->type < QUIRK_TYPE_COUNT) {
3196                 return quirk_funcs[quirk->type](chip, iface, quirk);
3197         } else {
3198                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
3199                 return -ENXIO;
3200         }
3201 }
3202
3203
3204 /*
3205  * common proc files to show the usb device info
3206  */
3207 static void proc_audio_usbbus_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3208 {
3209         struct snd_usb_audio *chip = entry->private_data;
3210         if (! chip->shutdown)
3211                 snd_iprintf(buffer, "%03d/%03d\n", chip->dev->bus->busnum, chip->dev->devnum);
3212 }
3213
3214 static void proc_audio_usbid_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3215 {
3216         struct snd_usb_audio *chip = entry->private_data;
3217         if (! chip->shutdown)
3218                 snd_iprintf(buffer, "%04x:%04x\n", 
3219                             USB_ID_VENDOR(chip->usb_id),
3220                             USB_ID_PRODUCT(chip->usb_id));
3221 }
3222
3223 static void snd_usb_audio_create_proc(struct snd_usb_audio *chip)
3224 {
3225         struct snd_info_entry *entry;
3226         if (! snd_card_proc_new(chip->card, "usbbus", &entry))
3227                 snd_info_set_text_ops(entry, chip, proc_audio_usbbus_read);
3228         if (! snd_card_proc_new(chip->card, "usbid", &entry))
3229                 snd_info_set_text_ops(entry, chip, proc_audio_usbid_read);
3230 }
3231
3232 /*
3233  * free the chip instance
3234  *
3235  * here we have to do not much, since pcm and controls are already freed
3236  *
3237  */
3238
3239 static int snd_usb_audio_free(struct snd_usb_audio *chip)
3240 {
3241         kfree(chip);
3242         return 0;
3243 }
3244
3245 static int snd_usb_audio_dev_free(struct snd_device *device)
3246 {
3247         struct snd_usb_audio *chip = device->device_data;
3248         return snd_usb_audio_free(chip);
3249 }
3250
3251
3252 /*
3253  * create a chip instance and set its names.
3254  */
3255 static int snd_usb_audio_create(struct usb_device *dev, int idx,
3256                                 const struct snd_usb_audio_quirk *quirk,
3257                                 struct snd_usb_audio **rchip)
3258 {
3259         struct snd_card *card;
3260         struct snd_usb_audio *chip;
3261         int err, len;
3262         char component[14];
3263         static struct snd_device_ops ops = {
3264                 .dev_free =     snd_usb_audio_dev_free,
3265         };
3266
3267         *rchip = NULL;
3268
3269         if (snd_usb_get_speed(dev) != USB_SPEED_FULL &&
3270             snd_usb_get_speed(dev) != USB_SPEED_HIGH) {
3271                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
3272                 return -ENXIO;
3273         }
3274
3275         card = snd_card_new(index[idx], id[idx], THIS_MODULE, 0);
3276         if (card == NULL) {
3277                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
3278                 return -ENOMEM;
3279         }
3280
3281         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
3282         if (! chip) {
3283                 snd_card_free(card);
3284                 return -ENOMEM;
3285         }
3286
3287         chip->index = idx;
3288         chip->dev = dev;
3289         chip->card = card;
3290         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3291                               le16_to_cpu(dev->descriptor.idProduct));
3292         INIT_LIST_HEAD(&chip->pcm_list);
3293         INIT_LIST_HEAD(&chip->midi_list);
3294         INIT_LIST_HEAD(&chip->mixer_list);
3295
3296         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
3297                 snd_usb_audio_free(chip);
3298                 snd_card_free(card);
3299                 return err;
3300         }
3301
3302         strcpy(card->driver, "USB-Audio");
3303         sprintf(component, "USB%04x:%04x",
3304                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
3305         snd_component_add(card, component);
3306
3307         /* retrieve the device string as shortname */
3308         if (quirk && quirk->product_name) {
3309                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
3310         } else {
3311                 if (!dev->descriptor.iProduct ||
3312                     usb_string(dev, dev->descriptor.iProduct,
3313                                card->shortname, sizeof(card->shortname)) <= 0) {
3314                         /* no name available from anywhere, so use ID */
3315                         sprintf(card->shortname, "USB Device %#04x:%#04x",
3316                                 USB_ID_VENDOR(chip->usb_id),
3317                                 USB_ID_PRODUCT(chip->usb_id));
3318                 }
3319         }
3320
3321         /* retrieve the vendor and device strings as longname */
3322         if (quirk && quirk->vendor_name) {
3323                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
3324         } else {
3325                 if (dev->descriptor.iManufacturer)
3326                         len = usb_string(dev, dev->descriptor.iManufacturer,
3327                                          card->longname, sizeof(card->longname));
3328                 else
3329                         len = 0;
3330                 /* we don't really care if there isn't any vendor string */
3331         }
3332         if (len > 0)
3333                 strlcat(card->longname, " ", sizeof(card->longname));
3334
3335         strlcat(card->longname, card->shortname, sizeof(card->longname));
3336
3337         len = strlcat(card->longname, " at ", sizeof(card->longname));
3338
3339         if (len < sizeof(card->longname))
3340                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
3341
3342         strlcat(card->longname,
3343                 snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" : ", high speed",
3344                 sizeof(card->longname));
3345
3346         snd_usb_audio_create_proc(chip);
3347
3348         *rchip = chip;
3349         return 0;
3350 }
3351
3352
3353 /*
3354  * probe the active usb device
3355  *
3356  * note that this can be called multiple times per a device, when it
3357  * includes multiple audio control interfaces.
3358  *
3359  * thus we check the usb device pointer and creates the card instance
3360  * only at the first time.  the successive calls of this function will
3361  * append the pcm interface to the corresponding card.
3362  */
3363 static void *snd_usb_audio_probe(struct usb_device *dev,
3364                                  struct usb_interface *intf,
3365                                  const struct usb_device_id *usb_id)
3366 {
3367         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
3368         int i, err;
3369         struct snd_usb_audio *chip;
3370         struct usb_host_interface *alts;
3371         int ifnum;
3372         u32 id;
3373
3374         alts = &intf->altsetting[0];
3375         ifnum = get_iface_desc(alts)->bInterfaceNumber;
3376         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3377                     le16_to_cpu(dev->descriptor.idProduct));
3378
3379         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
3380                 goto __err_val;
3381
3382         /* SB Extigy needs special boot-up sequence */
3383         /* if more models come, this will go to the quirk list. */
3384         if (id == USB_ID(0x041e, 0x3000)) {
3385                 if (snd_usb_extigy_boot_quirk(dev, intf) < 0)
3386                         goto __err_val;
3387         }
3388         /* SB Audigy 2 NX needs its own boot-up magic, too */
3389         if (id == USB_ID(0x041e, 0x3020)) {
3390                 if (snd_usb_audigy2nx_boot_quirk(dev) < 0)
3391                         goto __err_val;
3392         }
3393
3394         /* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
3395         if (id == USB_ID(0x10f5, 0x0200)) {
3396                 if (snd_usb_cm106_boot_quirk(dev) < 0)
3397                         goto __err_val;
3398         }
3399
3400         /*
3401          * found a config.  now register to ALSA
3402          */
3403
3404         /* check whether it's already registered */
3405         chip = NULL;
3406         mutex_lock(&register_mutex);
3407         for (i = 0; i < SNDRV_CARDS; i++) {
3408                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
3409                         if (usb_chip[i]->shutdown) {
3410                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
3411                                 goto __error;
3412                         }
3413                         chip = usb_chip[i];
3414                         break;
3415                 }
3416         }
3417         if (! chip) {
3418                 /* it's a fresh one.
3419                  * now look for an empty slot and create a new card instance
3420                  */
3421                 for (i = 0; i < SNDRV_CARDS; i++)
3422                         if (enable[i] && ! usb_chip[i] &&
3423                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
3424                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
3425                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
3426                                         goto __error;
3427                                 }
3428                                 snd_card_set_dev(chip->card, &intf->dev);
3429                                 break;
3430                         }
3431                 if (! chip) {
3432                         snd_printk(KERN_ERR "no available usb audio device\n");
3433                         goto __error;
3434                 }
3435         }
3436
3437         err = 1; /* continue */
3438         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
3439                 /* need some special handlings */
3440                 if ((err = snd_usb_create_quirk(chip, intf, quirk)) < 0)
3441                         goto __error;
3442         }
3443
3444         if (err > 0) {
3445                 /* create normal USB audio interfaces */
3446                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
3447                     snd_usb_create_mixer(chip, ifnum) < 0) {
3448                         goto __error;
3449                 }
3450         }
3451
3452         /* we are allowed to call snd_card_register() many times */
3453         if (snd_card_register(chip->card) < 0) {
3454                 goto __error;
3455         }
3456
3457         usb_chip[chip->index] = chip;
3458         chip->num_interfaces++;
3459         mutex_unlock(&register_mutex);
3460         return chip;
3461
3462  __error:
3463         if (chip && !chip->num_interfaces)
3464                 snd_card_free(chip->card);
3465         mutex_unlock(&register_mutex);
3466  __err_val:
3467         return NULL;
3468 }
3469
3470 /*
3471  * we need to take care of counter, since disconnection can be called also
3472  * many times as well as usb_audio_probe().
3473  */
3474 static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
3475 {
3476         struct snd_usb_audio *chip;
3477         struct snd_card *card;
3478         struct list_head *p;
3479
3480         if (ptr == (void *)-1L)
3481                 return;
3482
3483         chip = ptr;
3484         card = chip->card;
3485         mutex_lock(&register_mutex);
3486         chip->shutdown = 1;
3487         chip->num_interfaces--;
3488         if (chip->num_interfaces <= 0) {
3489                 snd_card_disconnect(card);
3490                 /* release the pcm resources */
3491                 list_for_each(p, &chip->pcm_list) {
3492                         snd_usb_stream_disconnect(p);
3493                 }
3494                 /* release the midi resources */
3495                 list_for_each(p, &chip->midi_list) {
3496                         snd_usbmidi_disconnect(p);
3497                 }
3498                 /* release mixer resources */
3499                 list_for_each(p, &chip->mixer_list) {
3500                         snd_usb_mixer_disconnect(p);
3501                 }
3502                 usb_chip[chip->index] = NULL;
3503                 mutex_unlock(&register_mutex);
3504                 snd_card_free(card);
3505         } else {
3506                 mutex_unlock(&register_mutex);
3507         }
3508 }
3509
3510 /*
3511  * new 2.5 USB kernel API
3512  */
3513 static int usb_audio_probe(struct usb_interface *intf,
3514                            const struct usb_device_id *id)
3515 {
3516         void *chip;
3517         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
3518         if (chip) {
3519                 dev_set_drvdata(&intf->dev, chip);
3520                 return 0;
3521         } else
3522                 return -EIO;
3523 }
3524
3525 static void usb_audio_disconnect(struct usb_interface *intf)
3526 {
3527         snd_usb_audio_disconnect(interface_to_usbdev(intf),
3528                                  dev_get_drvdata(&intf->dev));
3529 }
3530
3531
3532 static int __init snd_usb_audio_init(void)
3533 {
3534         if (nrpacks < MIN_PACKS_URB || nrpacks > MAX_PACKS) {
3535                 printk(KERN_WARNING "invalid nrpacks value.\n");
3536                 return -EINVAL;
3537         }
3538         usb_register(&usb_audio_driver);
3539         return 0;
3540 }
3541
3542
3543 static void __exit snd_usb_audio_cleanup(void)
3544 {
3545         usb_deregister(&usb_audio_driver);
3546 }
3547
3548 module_init(snd_usb_audio_init);
3549 module_exit(snd_usb_audio_cleanup);