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