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