SAFE public projects git trees. - safe/jmp/linux-2.6/blob - sound/usb/pcm.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/audio.h>
  21 #include <linux/usb/audio-v2.h>
  22
  23 #include <sound/core.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "quirks.h"
  30 #include "debug.h"
  31 #include "urb.h"
  32 #include "helper.h"
  33 #include "pcm.h"
  34
  35 /*
  36  * return the current pcm pointer.  just based on the hwptr_done value.
  37  */
  38 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  39 {
  40         struct snd_usb_substream *subs;
  41         unsigned int hwptr_done;
  42
  43         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  44         spin_lock(&subs->lock);
  45         hwptr_done = subs->hwptr_done;
  46         spin_unlock(&subs->lock);
  47         return hwptr_done / (substream->runtime->frame_bits >> 3);
  48 }
  49
  50 /*
  51  * find a matching audio format
  52  */
  53 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  54                                        unsigned int rate, unsigned int channels)
  55 {
  56         struct list_head *p;
  57         struct audioformat *found = NULL;
  58         int cur_attr = 0, attr;
  59
  60         list_for_each(p, &subs->fmt_list) {
  61                 struct audioformat *fp;
  62                 fp = list_entry(p, struct audioformat, list);
  63                 if (!(fp->formats & (1uLL << format)))
  64                         continue;
  65                 if (fp->channels != channels)
  66                         continue;
  67                 if (rate < fp->rate_min || rate > fp->rate_max)
  68                         continue;
  69                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  70                         unsigned int i;
  71                         for (i = 0; i < fp->nr_rates; i++)
  72                                 if (fp->rate_table[i] == rate)
  73                                         break;
  74                         if (i >= fp->nr_rates)
  75                                 continue;
  76                 }
  77                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  78                 if (! found) {
  79                         found = fp;
  80                         cur_attr = attr;
  81                         continue;
  82                 }
  83                 /* avoid async out and adaptive in if the other method
  84                  * supports the same format.
  85                  * this is a workaround for the case like
  86                  * M-audio audiophile USB.
  87                  */
  88                 if (attr != cur_attr) {
  89                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  90                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  91                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  92                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  93                                 continue;
  94                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  95                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  96                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  97                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  98                                 found = fp;
  99                                 cur_attr = attr;
 100                                 continue;
 101                         }
 102                 }
 103                 /* find the format with the largest max. packet size */
 104                 if (fp->maxpacksize > found->maxpacksize) {
 105                         found = fp;
 106                         cur_attr = attr;
 107                 }
 108         }
 109         return found;
 110 }
 111
 112 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 113                          struct usb_host_interface *alts,
 114                          struct audioformat *fmt)
 115 {
 116         struct usb_device *dev = chip->dev;
 117         unsigned int ep;
 118         unsigned char data[1];
 119         int err;
 120
 121         ep = get_endpoint(alts, 0)->bEndpointAddress;
 122
 123         /* if endpoint doesn't have pitch control, bail out */
 124         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 125                 return 0;
 126
 127         data[0] = 1;
 128         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 129                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 130                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 131                                    data, sizeof(data), 1000)) < 0) {
 132                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 133                            dev->devnum, iface, ep);
 134                 return err;
 135         }
 136
 137         return 0;
 138 }
 139
 140 /*
 141  * initialize the picth control and sample rate
 142  */
 143 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 144                        struct usb_host_interface *alts,
 145                        struct audioformat *fmt)
 146 {
 147         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 148
 149         switch (altsd->bInterfaceProtocol) {
 150         case UAC_VERSION_1:
 151                 return init_pitch_v1(chip, iface, alts, fmt);
 152
 153         case UAC_VERSION_2:
 154                 /* not implemented yet */
 155                 return 0;
 156         }
 157
 158         return -EINVAL;
 159 }
 160
 161 static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
 162                               struct usb_host_interface *alts,
 163                               struct audioformat *fmt, int rate)
 164 {
 165         struct usb_device *dev = chip->dev;
 166         unsigned int ep;
 167         unsigned char data[3];
 168         int err, crate;
 169
 170         ep = get_endpoint(alts, 0)->bEndpointAddress;
 171         /* if endpoint doesn't have sampling rate control, bail out */
 172         if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) {
 173                 snd_printk(KERN_WARNING "%d:%d:%d: endpoint lacks sample rate attribute bit, cannot set.\n",
 174                                    dev->devnum, iface, fmt->altsetting);
 175                 return 0;
 176         }
 177
 178         data[0] = rate;
 179         data[1] = rate >> 8;
 180         data[2] = rate >> 16;
 181         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 182                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 183                                    UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
 184                                    data, sizeof(data), 1000)) < 0) {
 185                 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
 186                            dev->devnum, iface, fmt->altsetting, rate, ep);
 187                 return err;
 188         }
 189         if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
 190                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
 191                                    UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
 192                                    data, sizeof(data), 1000)) < 0) {
 193                 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
 194                            dev->devnum, iface, fmt->altsetting, ep);
 195                 return 0; /* some devices don't support reading */
 196         }
 197         crate = data[0] | (data[1] << 8) | (data[2] << 16);
 198         if (crate != rate) {
 199                 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
 200                 // runtime->rate = crate;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
 207                               struct usb_host_interface *alts,
 208                               struct audioformat *fmt, int rate)
 209 {
 210         struct usb_device *dev = chip->dev;
 211         unsigned char data[4];
 212         int err, crate;
 213
 214         data[0] = rate;
 215         data[1] = rate >> 8;
 216         data[2] = rate >> 16;
 217         data[3] = rate >> 24;
 218         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 219                                    USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 220                                    UAC2_CS_CONTROL_SAM_FREQ << 8, chip->clock_id << 8,
 221                                    data, sizeof(data), 1000)) < 0) {
 222                 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
 223                            dev->devnum, iface, fmt->altsetting, rate);
 224                 return err;
 225         }
 226         if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
 227                                    USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 228                                    UAC2_CS_CONTROL_SAM_FREQ << 8, chip->clock_id << 8,
 229                                    data, sizeof(data), 1000)) < 0) {
 230                 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
 231                            dev->devnum, iface, fmt->altsetting);
 232                 return err;
 233         }
 234         crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 235         if (crate != rate)
 236                 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
 237
 238         return 0;
 239 }
 240
 241 int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
 242                              struct usb_host_interface *alts,
 243                              struct audioformat *fmt, int rate)
 244 {
 245         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 246
 247         switch (altsd->bInterfaceProtocol) {
 248         case UAC_VERSION_1:
 249                 return set_sample_rate_v1(chip, iface, alts, fmt, rate);
 250
 251         case UAC_VERSION_2:
 252                 return set_sample_rate_v2(chip, iface, alts, fmt, rate);
 253         }
 254
 255         return -EINVAL;
 256 }
 257
 258 /*
 259  * find a matching format and set up the interface
 260  */
 261 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 262 {
 263         struct usb_device *dev = subs->dev;
 264         struct usb_host_interface *alts;
 265         struct usb_interface_descriptor *altsd;
 266         struct usb_interface *iface;
 267         unsigned int ep, attr;
 268         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 269         int err;
 270
 271         iface = usb_ifnum_to_if(dev, fmt->iface);
 272         if (WARN_ON(!iface))
 273                 return -EINVAL;
 274         alts = &iface->altsetting[fmt->altset_idx];
 275         altsd = get_iface_desc(alts);
 276         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 277                 return -EINVAL;
 278
 279         if (fmt == subs->cur_audiofmt)
 280                 return 0;
 281
 282         /* close the old interface */
 283         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 284                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 285                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 286                                 dev->devnum, fmt->iface, fmt->altsetting);
 287                         return -EIO;
 288                 }
 289                 subs->interface = -1;
 290                 subs->altset_idx = 0;
 291         }
 292
 293         /* set interface */
 294         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 295                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 296                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 297                                    dev->devnum, fmt->iface, fmt->altsetting);
 298                         return -EIO;
 299                 }
 300                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 301                 subs->interface = fmt->iface;
 302                 subs->altset_idx = fmt->altset_idx;
 303         }
 304
 305         /* create a data pipe */
 306         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 307         if (is_playback)
 308                 subs->datapipe = usb_sndisocpipe(dev, ep);
 309         else
 310                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 311         subs->datainterval = fmt->datainterval;
 312         subs->syncpipe = subs->syncinterval = 0;
 313         subs->maxpacksize = fmt->maxpacksize;
 314         subs->fill_max = 0;
 315
 316         /* we need a sync pipe in async OUT or adaptive IN mode */
 317         /* check the number of EP, since some devices have broken
 318          * descriptors which fool us.  if it has only one EP,
 319          * assume it as adaptive-out or sync-in.
 320          */
 321         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 322         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 323              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 324             altsd->bNumEndpoints >= 2) {
 325                 /* check sync-pipe endpoint */
 326                 /* ... and check descriptor size before accessing bSynchAddress
 327                    because there is a version of the SB Audigy 2 NX firmware lacking
 328                    the audio fields in the endpoint descriptors */
 329                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 330                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 331                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 332                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 333                                    dev->devnum, fmt->iface, fmt->altsetting);
 334                         return -EINVAL;
 335                 }
 336                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 337                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 338                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 339                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 340                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 341                                    dev->devnum, fmt->iface, fmt->altsetting);
 342                         return -EINVAL;
 343                 }
 344                 ep &= USB_ENDPOINT_NUMBER_MASK;
 345                 if (is_playback)
 346                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 347                 else
 348                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 349                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 350                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 351                     get_endpoint(alts, 1)->bRefresh <= 9)
 352                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 353                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 354                         subs->syncinterval = 1;
 355                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 356                          get_endpoint(alts, 1)->bInterval <= 16)
 357                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 358                 else
 359                         subs->syncinterval = 3;
 360         }
 361
 362         /* always fill max packet size */
 363         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 364                 subs->fill_max = 1;
 365
 366         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 367                 return err;
 368
 369         subs->cur_audiofmt = fmt;
 370
 371         snd_usb_set_format_quirk(subs, fmt);
 372
 373 #if 0
 374         printk(KERN_DEBUG
 375                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 376                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 377         printk(KERN_DEBUG
 378                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 379                subs->datapipe, subs->syncpipe);
 380 #endif
 381
 382         return 0;
 383 }
 384
 385 /*
 386  * hw_params callback
 387  *
 388  * allocate a buffer and set the given audio format.
 389  *
 390  * so far we use a physically linear buffer although packetize transfer
 391  * doesn't need a continuous area.
 392  * if sg buffer is supported on the later version of alsa, we'll follow
 393  * that.
 394  */
 395 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 396                              struct snd_pcm_hw_params *hw_params)
 397 {
 398         struct snd_usb_substream *subs = substream->runtime->private_data;
 399         struct audioformat *fmt;
 400         unsigned int channels, rate, format;
 401         int ret, changed;
 402
 403         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 404                                                params_buffer_bytes(hw_params));
 405         if (ret < 0)
 406                 return ret;
 407
 408         format = params_format(hw_params);
 409         rate = params_rate(hw_params);
 410         channels = params_channels(hw_params);
 411         fmt = find_format(subs, format, rate, channels);
 412         if (!fmt) {
 413                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 414                            format, rate, channels);
 415                 return -EINVAL;
 416         }
 417
 418         changed = subs->cur_audiofmt != fmt ||
 419                 subs->period_bytes != params_period_bytes(hw_params) ||
 420                 subs->cur_rate != rate;
 421         if ((ret = set_format(subs, fmt)) < 0)
 422                 return ret;
 423
 424         if (subs->cur_rate != rate) {
 425                 struct usb_host_interface *alts;
 426                 struct usb_interface *iface;
 427                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 428                 alts = &iface->altsetting[fmt->altset_idx];
 429                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 430                 if (ret < 0)
 431                         return ret;
 432                 subs->cur_rate = rate;
 433         }
 434
 435         if (changed) {
 436                 /* format changed */
 437                 snd_usb_release_substream_urbs(subs, 0);
 438                 /* influenced: period_bytes, channels, rate, format, */
 439                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 440                                                   params_rate(hw_params),
 441                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 442                                                         params_channels(hw_params));
 443         }
 444
 445         return ret;
 446 }
 447
 448 /*
 449  * hw_free callback
 450  *
 451  * reset the audio format and release the buffer
 452  */
 453 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 454 {
 455         struct snd_usb_substream *subs = substream->runtime->private_data;
 456
 457         subs->cur_audiofmt = NULL;
 458         subs->cur_rate = 0;
 459         subs->period_bytes = 0;
 460         if (!subs->stream->chip->shutdown)
 461                 snd_usb_release_substream_urbs(subs, 0);
 462         return snd_pcm_lib_free_vmalloc_buffer(substream);
 463 }
 464
 465 /*
 466  * prepare callback
 467  *
 468  * only a few subtle things...
 469  */
 470 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 471 {
 472         struct snd_pcm_runtime *runtime = substream->runtime;
 473         struct snd_usb_substream *subs = runtime->private_data;
 474
 475         if (! subs->cur_audiofmt) {
 476                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 477                 return -ENXIO;
 478         }
 479
 480         /* some unit conversions in runtime */
 481         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 482         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 483
 484         /* reset the pointer */
 485         subs->hwptr_done = 0;
 486         subs->transfer_done = 0;
 487         subs->phase = 0;
 488         runtime->delay = 0;
 489
 490         return snd_usb_substream_prepare(subs, runtime);
 491 }
 492
 493 static struct snd_pcm_hardware snd_usb_hardware =
 494 {
 495         .info =                 SNDRV_PCM_INFO_MMAP |
 496                                 SNDRV_PCM_INFO_MMAP_VALID |
 497                                 SNDRV_PCM_INFO_BATCH |
 498                                 SNDRV_PCM_INFO_INTERLEAVED |
 499                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 500                                 SNDRV_PCM_INFO_PAUSE,
 501         .buffer_bytes_max =     1024 * 1024,
 502         .period_bytes_min =     64,
 503         .period_bytes_max =     512 * 1024,
 504         .periods_min =          2,
 505         .periods_max =          1024,
 506 };
 507
 508 static int hw_check_valid_format(struct snd_usb_substream *subs,
 509                                  struct snd_pcm_hw_params *params,
 510                                  struct audioformat *fp)
 511 {
 512         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 513         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 514         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 515         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 516         struct snd_mask check_fmts;
 517         unsigned int ptime;
 518
 519         /* check the format */
 520         snd_mask_none(&check_fmts);
 521         check_fmts.bits[0] = (u32)fp->formats;
 522         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 523         snd_mask_intersect(&check_fmts, fmts);
 524         if (snd_mask_empty(&check_fmts)) {
 525                 hwc_debug("   > check: no supported format %d\n", fp->format);
 526                 return 0;
 527         }
 528         /* check the channels */
 529         if (fp->channels < ct->min || fp->channels > ct->max) {
 530                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 531                 return 0;
 532         }
 533         /* check the rate is within the range */
 534         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 535                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 536                 return 0;
 537         }
 538         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 539                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 540                 return 0;
 541         }
 542         /* check whether the period time is >= the data packet interval */
 543         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
 544                 ptime = 125 * (1 << fp->datainterval);
 545                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 546                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 547                         return 0;
 548                 }
 549         }
 550         return 1;
 551 }
 552
 553 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 554                         struct snd_pcm_hw_rule *rule)
 555 {
 556         struct snd_usb_substream *subs = rule->private;
 557         struct list_head *p;
 558         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 559         unsigned int rmin, rmax;
 560         int changed;
 561
 562         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 563         changed = 0;
 564         rmin = rmax = 0;
 565         list_for_each(p, &subs->fmt_list) {
 566                 struct audioformat *fp;
 567                 fp = list_entry(p, struct audioformat, list);
 568                 if (!hw_check_valid_format(subs, params, fp))
 569                         continue;
 570                 if (changed++) {
 571                         if (rmin > fp->rate_min)
 572                                 rmin = fp->rate_min;
 573                         if (rmax < fp->rate_max)
 574                                 rmax = fp->rate_max;
 575                 } else {
 576                         rmin = fp->rate_min;
 577                         rmax = fp->rate_max;
 578                 }
 579         }
 580
 581         if (!changed) {
 582                 hwc_debug("  --> get empty\n");
 583                 it->empty = 1;
 584                 return -EINVAL;
 585         }
 586
 587         changed = 0;
 588         if (it->min < rmin) {
 589                 it->min = rmin;
 590                 it->openmin = 0;
 591                 changed = 1;
 592         }
 593         if (it->max > rmax) {
 594                 it->max = rmax;
 595                 it->openmax = 0;
 596                 changed = 1;
 597         }
 598         if (snd_interval_checkempty(it)) {
 599                 it->empty = 1;
 600                 return -EINVAL;
 601         }
 602         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 603         return changed;
 604 }
 605
 606
 607 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 608                             struct snd_pcm_hw_rule *rule)
 609 {
 610         struct snd_usb_substream *subs = rule->private;
 611         struct list_head *p;
 612         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 613         unsigned int rmin, rmax;
 614         int changed;
 615
 616         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 617         changed = 0;
 618         rmin = rmax = 0;
 619         list_for_each(p, &subs->fmt_list) {
 620                 struct audioformat *fp;
 621                 fp = list_entry(p, struct audioformat, list);
 622                 if (!hw_check_valid_format(subs, params, fp))
 623                         continue;
 624                 if (changed++) {
 625                         if (rmin > fp->channels)
 626                                 rmin = fp->channels;
 627                         if (rmax < fp->channels)
 628                                 rmax = fp->channels;
 629                 } else {
 630                         rmin = fp->channels;
 631                         rmax = fp->channels;
 632                 }
 633         }
 634
 635         if (!changed) {
 636                 hwc_debug("  --> get empty\n");
 637                 it->empty = 1;
 638                 return -EINVAL;
 639         }
 640
 641         changed = 0;
 642         if (it->min < rmin) {
 643                 it->min = rmin;
 644                 it->openmin = 0;
 645                 changed = 1;
 646         }
 647         if (it->max > rmax) {
 648                 it->max = rmax;
 649                 it->openmax = 0;
 650                 changed = 1;
 651         }
 652         if (snd_interval_checkempty(it)) {
 653                 it->empty = 1;
 654                 return -EINVAL;
 655         }
 656         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 657         return changed;
 658 }
 659
 660 static int hw_rule_format(struct snd_pcm_hw_params *params,
 661                           struct snd_pcm_hw_rule *rule)
 662 {
 663         struct snd_usb_substream *subs = rule->private;
 664         struct list_head *p;
 665         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 666         u64 fbits;
 667         u32 oldbits[2];
 668         int changed;
 669
 670         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 671         fbits = 0;
 672         list_for_each(p, &subs->fmt_list) {
 673                 struct audioformat *fp;
 674                 fp = list_entry(p, struct audioformat, list);
 675                 if (!hw_check_valid_format(subs, params, fp))
 676                         continue;
 677                 fbits |= fp->formats;
 678         }
 679
 680         oldbits[0] = fmt->bits[0];
 681         oldbits[1] = fmt->bits[1];
 682         fmt->bits[0] &= (u32)fbits;
 683         fmt->bits[1] &= (u32)(fbits >> 32);
 684         if (!fmt->bits[0] && !fmt->bits[1]) {
 685                 hwc_debug("  --> get empty\n");
 686                 return -EINVAL;
 687         }
 688         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 689         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 690         return changed;
 691 }
 692
 693 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 694                                struct snd_pcm_hw_rule *rule)
 695 {
 696         struct snd_usb_substream *subs = rule->private;
 697         struct audioformat *fp;
 698         struct snd_interval *it;
 699         unsigned char min_datainterval;
 700         unsigned int pmin;
 701         int changed;
 702
 703         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 704         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 705         min_datainterval = 0xff;
 706         list_for_each_entry(fp, &subs->fmt_list, list) {
 707                 if (!hw_check_valid_format(subs, params, fp))
 708                         continue;
 709                 min_datainterval = min(min_datainterval, fp->datainterval);
 710         }
 711         if (min_datainterval == 0xff) {
 712                 hwc_debug("  --> get emtpy\n");
 713                 it->empty = 1;
 714                 return -EINVAL;
 715         }
 716         pmin = 125 * (1 << min_datainterval);
 717         changed = 0;
 718         if (it->min < pmin) {
 719                 it->min = pmin;
 720                 it->openmin = 0;
 721                 changed = 1;
 722         }
 723         if (snd_interval_checkempty(it)) {
 724                 it->empty = 1;
 725                 return -EINVAL;
 726         }
 727         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 728         return changed;
 729 }
 730
 731 /*
 732  *  If the device supports unusual bit rates, does the request meet these?
 733  */
 734 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 735                                   struct snd_usb_substream *subs)
 736 {
 737         struct audioformat *fp;
 738         int count = 0, needs_knot = 0;
 739         int err;
 740
 741         list_for_each_entry(fp, &subs->fmt_list, list) {
 742                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 743                         return 0;
 744                 count += fp->nr_rates;
 745                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 746                         needs_knot = 1;
 747         }
 748         if (!needs_knot)
 749                 return 0;
 750
 751         subs->rate_list.count = count;
 752         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 753         subs->rate_list.mask = 0;
 754         count = 0;
 755         list_for_each_entry(fp, &subs->fmt_list, list) {
 756                 int i;
 757                 for (i = 0; i < fp->nr_rates; i++)
 758                         subs->rate_list.list[count++] = fp->rate_table[i];
 759         }
 760         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 761                                          &subs->rate_list);
 762         if (err < 0)
 763                 return err;
 764
 765         return 0;
 766 }
 767
 768
 769 /*
 770  * set up the runtime hardware information.
 771  */
 772
 773 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 774 {
 775         struct list_head *p;
 776         unsigned int pt, ptmin;
 777         int param_period_time_if_needed;
 778         int err;
 779
 780         runtime->hw.formats = subs->formats;
 781
 782         runtime->hw.rate_min = 0x7fffffff;
 783         runtime->hw.rate_max = 0;
 784         runtime->hw.channels_min = 256;
 785         runtime->hw.channels_max = 0;
 786         runtime->hw.rates = 0;
 787         ptmin = UINT_MAX;
 788         /* check min/max rates and channels */
 789         list_for_each(p, &subs->fmt_list) {
 790                 struct audioformat *fp;
 791                 fp = list_entry(p, struct audioformat, list);
 792                 runtime->hw.rates |= fp->rates;
 793                 if (runtime->hw.rate_min > fp->rate_min)
 794                         runtime->hw.rate_min = fp->rate_min;
 795                 if (runtime->hw.rate_max < fp->rate_max)
 796                         runtime->hw.rate_max = fp->rate_max;
 797                 if (runtime->hw.channels_min > fp->channels)
 798                         runtime->hw.channels_min = fp->channels;
 799                 if (runtime->hw.channels_max < fp->channels)
 800                         runtime->hw.channels_max = fp->channels;
 801                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 802                         /* FIXME: there might be more than one audio formats... */
 803                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 804                                 fp->frame_size;
 805                 }
 806                 pt = 125 * (1 << fp->datainterval);
 807                 ptmin = min(ptmin, pt);
 808         }
 809
 810         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 811         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
 812                 /* full speed devices have fixed data packet interval */
 813                 ptmin = 1000;
 814         if (ptmin == 1000)
 815                 /* if period time doesn't go below 1 ms, no rules needed */
 816                 param_period_time_if_needed = -1;
 817         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 818                                      ptmin, UINT_MAX);
 819
 820         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 821                                        hw_rule_rate, subs,
 822                                        SNDRV_PCM_HW_PARAM_FORMAT,
 823                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 824                                        param_period_time_if_needed,
 825                                        -1)) < 0)
 826                 return err;
 827         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 828                                        hw_rule_channels, subs,
 829                                        SNDRV_PCM_HW_PARAM_FORMAT,
 830                                        SNDRV_PCM_HW_PARAM_RATE,
 831                                        param_period_time_if_needed,
 832                                        -1)) < 0)
 833                 return err;
 834         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 835                                        hw_rule_format, subs,
 836                                        SNDRV_PCM_HW_PARAM_RATE,
 837                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 838                                        param_period_time_if_needed,
 839                                        -1)) < 0)
 840                 return err;
 841         if (param_period_time_if_needed >= 0) {
 842                 err = snd_pcm_hw_rule_add(runtime, 0,
 843                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 844                                           hw_rule_period_time, subs,
 845                                           SNDRV_PCM_HW_PARAM_FORMAT,
 846                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 847                                           SNDRV_PCM_HW_PARAM_RATE,
 848                                           -1);
 849                 if (err < 0)
 850                         return err;
 851         }
 852         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 853                 return err;
 854         return 0;
 855 }
 856
 857 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 858 {
 859         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 860         struct snd_pcm_runtime *runtime = substream->runtime;
 861         struct snd_usb_substream *subs = &as->substream[direction];
 862
 863         subs->interface = -1;
 864         subs->altset_idx = 0;
 865         runtime->hw = snd_usb_hardware;
 866         runtime->private_data = subs;
 867         subs->pcm_substream = substream;
 868         return setup_hw_info(runtime, subs);
 869 }
 870
 871 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 872 {
 873         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 874         struct snd_usb_substream *subs = &as->substream[direction];
 875
 876         if (!as->chip->shutdown && subs->interface >= 0) {
 877                 usb_set_interface(subs->dev, subs->interface, 0);
 878                 subs->interface = -1;
 879         }
 880         subs->pcm_substream = NULL;
 881         return 0;
 882 }
 883
 884 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 885 {
 886         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 887 }
 888
 889 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 890 {
 891         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 892 }
 893
 894 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 895 {
 896         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 897 }
 898
 899 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 900 {
 901         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 902 }
 903
 904 static struct snd_pcm_ops snd_usb_playback_ops = {
 905         .open =         snd_usb_playback_open,
 906         .close =        snd_usb_playback_close,
 907         .ioctl =        snd_pcm_lib_ioctl,
 908         .hw_params =    snd_usb_hw_params,
 909         .hw_free =      snd_usb_hw_free,
 910         .prepare =      snd_usb_pcm_prepare,
 911         .trigger =      snd_usb_substream_playback_trigger,
 912         .pointer =      snd_usb_pcm_pointer,
 913         .page =         snd_pcm_lib_get_vmalloc_page,
 914         .mmap =         snd_pcm_lib_mmap_vmalloc,
 915 };
 916
 917 static struct snd_pcm_ops snd_usb_capture_ops = {
 918         .open =         snd_usb_capture_open,
 919         .close =        snd_usb_capture_close,
 920         .ioctl =        snd_pcm_lib_ioctl,
 921         .hw_params =    snd_usb_hw_params,
 922         .hw_free =      snd_usb_hw_free,
 923         .prepare =      snd_usb_pcm_prepare,
 924         .trigger =      snd_usb_substream_capture_trigger,
 925         .pointer =      snd_usb_pcm_pointer,
 926         .page =         snd_pcm_lib_get_vmalloc_page,
 927         .mmap =         snd_pcm_lib_mmap_vmalloc,
 928 };
 929
 930 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 931 {
 932         snd_pcm_set_ops(pcm, stream,
 933                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 934                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 935 }