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 #include "clock.h"
  35
  36 /*
  37  * return the current pcm pointer.  just based on the hwptr_done value.
  38  */
  39 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  40 {
  41         struct snd_usb_substream *subs;
  42         unsigned int hwptr_done;
  43
  44         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  45         spin_lock(&subs->lock);
  46         hwptr_done = subs->hwptr_done;
  47         spin_unlock(&subs->lock);
  48         return hwptr_done / (substream->runtime->frame_bits >> 3);
  49 }
  50
  51 /*
  52  * find a matching audio format
  53  */
  54 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  55                                        unsigned int rate, unsigned int channels)
  56 {
  57         struct list_head *p;
  58         struct audioformat *found = NULL;
  59         int cur_attr = 0, attr;
  60
  61         list_for_each(p, &subs->fmt_list) {
  62                 struct audioformat *fp;
  63                 fp = list_entry(p, struct audioformat, list);
  64                 if (!(fp->formats & (1uLL << format)))
  65                         continue;
  66                 if (fp->channels != channels)
  67                         continue;
  68                 if (rate < fp->rate_min || rate > fp->rate_max)
  69                         continue;
  70                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  71                         unsigned int i;
  72                         for (i = 0; i < fp->nr_rates; i++)
  73                                 if (fp->rate_table[i] == rate)
  74                                         break;
  75                         if (i >= fp->nr_rates)
  76                                 continue;
  77                 }
  78                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  79                 if (! found) {
  80                         found = fp;
  81                         cur_attr = attr;
  82                         continue;
  83                 }
  84                 /* avoid async out and adaptive in if the other method
  85                  * supports the same format.
  86                  * this is a workaround for the case like
  87                  * M-audio audiophile USB.
  88                  */
  89                 if (attr != cur_attr) {
  90                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  91                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  92                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  93                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  94                                 continue;
  95                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  96                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  97                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  98                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
  99                                 found = fp;
 100                                 cur_attr = attr;
 101                                 continue;
 102                         }
 103                 }
 104                 /* find the format with the largest max. packet size */
 105                 if (fp->maxpacksize > found->maxpacksize) {
 106                         found = fp;
 107                         cur_attr = attr;
 108                 }
 109         }
 110         return found;
 111 }
 112
 113 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 114                          struct usb_host_interface *alts,
 115                          struct audioformat *fmt)
 116 {
 117         struct usb_device *dev = chip->dev;
 118         unsigned int ep;
 119         unsigned char data[1];
 120         int err;
 121
 122         ep = get_endpoint(alts, 0)->bEndpointAddress;
 123
 124         data[0] = 1;
 125         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 126                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 127                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 128                                    data, sizeof(data), 1000)) < 0) {
 129                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 130                            dev->devnum, iface, ep);
 131                 return err;
 132         }
 133
 134         return 0;
 135 }
 136
 137 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 138                          struct usb_host_interface *alts,
 139                          struct audioformat *fmt)
 140 {
 141         struct usb_device *dev = chip->dev;
 142         unsigned char data[1];
 143         unsigned int ep;
 144         int err;
 145
 146         ep = get_endpoint(alts, 0)->bEndpointAddress;
 147
 148         data[0] = 1;
 149         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 150                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 151                                    UAC2_EP_CS_PITCH << 8, 0,
 152                                    data, sizeof(data), 1000)) < 0) {
 153                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 154                            dev->devnum, iface, fmt->altsetting);
 155                 return err;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /*
 162  * initialize the pitch control and sample rate
 163  */
 164 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 165                        struct usb_host_interface *alts,
 166                        struct audioformat *fmt)
 167 {
 168         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 169
 170         /* if endpoint doesn't have pitch control, bail out */
 171         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 172                 return 0;
 173
 174         switch (altsd->bInterfaceProtocol) {
 175         case UAC_VERSION_1:
 176         default:
 177                 return init_pitch_v1(chip, iface, alts, fmt);
 178
 179         case UAC_VERSION_2:
 180                 return init_pitch_v2(chip, iface, alts, fmt);
 181         }
 182 }
 183
 184 /*
 185  * find a matching format and set up the interface
 186  */
 187 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 188 {
 189         struct usb_device *dev = subs->dev;
 190         struct usb_host_interface *alts;
 191         struct usb_interface_descriptor *altsd;
 192         struct usb_interface *iface;
 193         unsigned int ep, attr;
 194         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 195         int err;
 196
 197         iface = usb_ifnum_to_if(dev, fmt->iface);
 198         if (WARN_ON(!iface))
 199                 return -EINVAL;
 200         alts = &iface->altsetting[fmt->altset_idx];
 201         altsd = get_iface_desc(alts);
 202         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 203                 return -EINVAL;
 204
 205         if (fmt == subs->cur_audiofmt)
 206                 return 0;
 207
 208         /* close the old interface */
 209         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 210                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 211                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 212                                 dev->devnum, fmt->iface, fmt->altsetting);
 213                         return -EIO;
 214                 }
 215                 subs->interface = -1;
 216                 subs->altset_idx = 0;
 217         }
 218
 219         /* set interface */
 220         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 221                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 222                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 223                                    dev->devnum, fmt->iface, fmt->altsetting);
 224                         return -EIO;
 225                 }
 226                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 227                 subs->interface = fmt->iface;
 228                 subs->altset_idx = fmt->altset_idx;
 229         }
 230
 231         /* create a data pipe */
 232         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 233         if (is_playback)
 234                 subs->datapipe = usb_sndisocpipe(dev, ep);
 235         else
 236                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 237         subs->datainterval = fmt->datainterval;
 238         subs->syncpipe = subs->syncinterval = 0;
 239         subs->maxpacksize = fmt->maxpacksize;
 240         subs->syncmaxsize = 0;
 241         subs->fill_max = 0;
 242
 243         /* we need a sync pipe in async OUT or adaptive IN mode */
 244         /* check the number of EP, since some devices have broken
 245          * descriptors which fool us.  if it has only one EP,
 246          * assume it as adaptive-out or sync-in.
 247          */
 248         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 249         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 250              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 251             altsd->bNumEndpoints >= 2) {
 252                 /* check sync-pipe endpoint */
 253                 /* ... and check descriptor size before accessing bSynchAddress
 254                    because there is a version of the SB Audigy 2 NX firmware lacking
 255                    the audio fields in the endpoint descriptors */
 256                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 257                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 258                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 259                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 260                                    dev->devnum, fmt->iface, fmt->altsetting);
 261                         return -EINVAL;
 262                 }
 263                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 264                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 265                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 266                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 267                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 268                                    dev->devnum, fmt->iface, fmt->altsetting);
 269                         return -EINVAL;
 270                 }
 271                 ep &= USB_ENDPOINT_NUMBER_MASK;
 272                 if (is_playback)
 273                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 274                 else
 275                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 276                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 277                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 278                     get_endpoint(alts, 1)->bRefresh <= 9)
 279                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 280                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 281                         subs->syncinterval = 1;
 282                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 283                          get_endpoint(alts, 1)->bInterval <= 16)
 284                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 285                 else
 286                         subs->syncinterval = 3;
 287                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 288         }
 289
 290         /* always fill max packet size */
 291         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 292                 subs->fill_max = 1;
 293
 294         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 295                 return err;
 296
 297         subs->cur_audiofmt = fmt;
 298
 299         snd_usb_set_format_quirk(subs, fmt);
 300
 301 #if 0
 302         printk(KERN_DEBUG
 303                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 304                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 305         printk(KERN_DEBUG
 306                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 307                subs->datapipe, subs->syncpipe);
 308 #endif
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * hw_params callback
 315  *
 316  * allocate a buffer and set the given audio format.
 317  *
 318  * so far we use a physically linear buffer although packetize transfer
 319  * doesn't need a continuous area.
 320  * if sg buffer is supported on the later version of alsa, we'll follow
 321  * that.
 322  */
 323 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 324                              struct snd_pcm_hw_params *hw_params)
 325 {
 326         struct snd_usb_substream *subs = substream->runtime->private_data;
 327         struct audioformat *fmt;
 328         unsigned int channels, rate, format;
 329         int ret, changed;
 330
 331         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 332                                                params_buffer_bytes(hw_params));
 333         if (ret < 0)
 334                 return ret;
 335
 336         format = params_format(hw_params);
 337         rate = params_rate(hw_params);
 338         channels = params_channels(hw_params);
 339         fmt = find_format(subs, format, rate, channels);
 340         if (!fmt) {
 341                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 342                            format, rate, channels);
 343                 return -EINVAL;
 344         }
 345
 346         changed = subs->cur_audiofmt != fmt ||
 347                 subs->period_bytes != params_period_bytes(hw_params) ||
 348                 subs->cur_rate != rate;
 349         if ((ret = set_format(subs, fmt)) < 0)
 350                 return ret;
 351
 352         if (subs->cur_rate != rate) {
 353                 struct usb_host_interface *alts;
 354                 struct usb_interface *iface;
 355                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 356                 alts = &iface->altsetting[fmt->altset_idx];
 357                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 358                 if (ret < 0)
 359                         return ret;
 360                 subs->cur_rate = rate;
 361         }
 362
 363         if (changed) {
 364                 /* format changed */
 365                 snd_usb_release_substream_urbs(subs, 0);
 366                 /* influenced: period_bytes, channels, rate, format, */
 367                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 368                                                   params_rate(hw_params),
 369                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 370                                                         params_channels(hw_params));
 371         }
 372
 373         return ret;
 374 }
 375
 376 /*
 377  * hw_free callback
 378  *
 379  * reset the audio format and release the buffer
 380  */
 381 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 382 {
 383         struct snd_usb_substream *subs = substream->runtime->private_data;
 384
 385         subs->cur_audiofmt = NULL;
 386         subs->cur_rate = 0;
 387         subs->period_bytes = 0;
 388         if (!subs->stream->chip->shutdown)
 389                 snd_usb_release_substream_urbs(subs, 0);
 390         return snd_pcm_lib_free_vmalloc_buffer(substream);
 391 }
 392
 393 /*
 394  * prepare callback
 395  *
 396  * only a few subtle things...
 397  */
 398 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 399 {
 400         struct snd_pcm_runtime *runtime = substream->runtime;
 401         struct snd_usb_substream *subs = runtime->private_data;
 402
 403         if (! subs->cur_audiofmt) {
 404                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 405                 return -ENXIO;
 406         }
 407
 408         /* some unit conversions in runtime */
 409         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 410         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 411
 412         /* reset the pointer */
 413         subs->hwptr_done = 0;
 414         subs->transfer_done = 0;
 415         subs->phase = 0;
 416         runtime->delay = 0;
 417
 418         return snd_usb_substream_prepare(subs, runtime);
 419 }
 420
 421 static struct snd_pcm_hardware snd_usb_hardware =
 422 {
 423         .info =                 SNDRV_PCM_INFO_MMAP |
 424                                 SNDRV_PCM_INFO_MMAP_VALID |
 425                                 SNDRV_PCM_INFO_BATCH |
 426                                 SNDRV_PCM_INFO_INTERLEAVED |
 427                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 428                                 SNDRV_PCM_INFO_PAUSE,
 429         .buffer_bytes_max =     1024 * 1024,
 430         .period_bytes_min =     64,
 431         .period_bytes_max =     512 * 1024,
 432         .periods_min =          2,
 433         .periods_max =          1024,
 434 };
 435
 436 static int hw_check_valid_format(struct snd_usb_substream *subs,
 437                                  struct snd_pcm_hw_params *params,
 438                                  struct audioformat *fp)
 439 {
 440         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 441         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 442         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 443         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 444         struct snd_mask check_fmts;
 445         unsigned int ptime;
 446
 447         /* check the format */
 448         snd_mask_none(&check_fmts);
 449         check_fmts.bits[0] = (u32)fp->formats;
 450         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 451         snd_mask_intersect(&check_fmts, fmts);
 452         if (snd_mask_empty(&check_fmts)) {
 453                 hwc_debug("   > check: no supported format %d\n", fp->format);
 454                 return 0;
 455         }
 456         /* check the channels */
 457         if (fp->channels < ct->min || fp->channels > ct->max) {
 458                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 459                 return 0;
 460         }
 461         /* check the rate is within the range */
 462         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 463                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 464                 return 0;
 465         }
 466         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 467                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 468                 return 0;
 469         }
 470         /* check whether the period time is >= the data packet interval */
 471         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 472                 ptime = 125 * (1 << fp->datainterval);
 473                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 474                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 475                         return 0;
 476                 }
 477         }
 478         return 1;
 479 }
 480
 481 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 482                         struct snd_pcm_hw_rule *rule)
 483 {
 484         struct snd_usb_substream *subs = rule->private;
 485         struct list_head *p;
 486         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 487         unsigned int rmin, rmax;
 488         int changed;
 489
 490         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 491         changed = 0;
 492         rmin = rmax = 0;
 493         list_for_each(p, &subs->fmt_list) {
 494                 struct audioformat *fp;
 495                 fp = list_entry(p, struct audioformat, list);
 496                 if (!hw_check_valid_format(subs, params, fp))
 497                         continue;
 498                 if (changed++) {
 499                         if (rmin > fp->rate_min)
 500                                 rmin = fp->rate_min;
 501                         if (rmax < fp->rate_max)
 502                                 rmax = fp->rate_max;
 503                 } else {
 504                         rmin = fp->rate_min;
 505                         rmax = fp->rate_max;
 506                 }
 507         }
 508
 509         if (!changed) {
 510                 hwc_debug("  --> get empty\n");
 511                 it->empty = 1;
 512                 return -EINVAL;
 513         }
 514
 515         changed = 0;
 516         if (it->min < rmin) {
 517                 it->min = rmin;
 518                 it->openmin = 0;
 519                 changed = 1;
 520         }
 521         if (it->max > rmax) {
 522                 it->max = rmax;
 523                 it->openmax = 0;
 524                 changed = 1;
 525         }
 526         if (snd_interval_checkempty(it)) {
 527                 it->empty = 1;
 528                 return -EINVAL;
 529         }
 530         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 531         return changed;
 532 }
 533
 534
 535 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 536                             struct snd_pcm_hw_rule *rule)
 537 {
 538         struct snd_usb_substream *subs = rule->private;
 539         struct list_head *p;
 540         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 541         unsigned int rmin, rmax;
 542         int changed;
 543
 544         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 545         changed = 0;
 546         rmin = rmax = 0;
 547         list_for_each(p, &subs->fmt_list) {
 548                 struct audioformat *fp;
 549                 fp = list_entry(p, struct audioformat, list);
 550                 if (!hw_check_valid_format(subs, params, fp))
 551                         continue;
 552                 if (changed++) {
 553                         if (rmin > fp->channels)
 554                                 rmin = fp->channels;
 555                         if (rmax < fp->channels)
 556                                 rmax = fp->channels;
 557                 } else {
 558                         rmin = fp->channels;
 559                         rmax = fp->channels;
 560                 }
 561         }
 562
 563         if (!changed) {
 564                 hwc_debug("  --> get empty\n");
 565                 it->empty = 1;
 566                 return -EINVAL;
 567         }
 568
 569         changed = 0;
 570         if (it->min < rmin) {
 571                 it->min = rmin;
 572                 it->openmin = 0;
 573                 changed = 1;
 574         }
 575         if (it->max > rmax) {
 576                 it->max = rmax;
 577                 it->openmax = 0;
 578                 changed = 1;
 579         }
 580         if (snd_interval_checkempty(it)) {
 581                 it->empty = 1;
 582                 return -EINVAL;
 583         }
 584         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 585         return changed;
 586 }
 587
 588 static int hw_rule_format(struct snd_pcm_hw_params *params,
 589                           struct snd_pcm_hw_rule *rule)
 590 {
 591         struct snd_usb_substream *subs = rule->private;
 592         struct list_head *p;
 593         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 594         u64 fbits;
 595         u32 oldbits[2];
 596         int changed;
 597
 598         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 599         fbits = 0;
 600         list_for_each(p, &subs->fmt_list) {
 601                 struct audioformat *fp;
 602                 fp = list_entry(p, struct audioformat, list);
 603                 if (!hw_check_valid_format(subs, params, fp))
 604                         continue;
 605                 fbits |= fp->formats;
 606         }
 607
 608         oldbits[0] = fmt->bits[0];
 609         oldbits[1] = fmt->bits[1];
 610         fmt->bits[0] &= (u32)fbits;
 611         fmt->bits[1] &= (u32)(fbits >> 32);
 612         if (!fmt->bits[0] && !fmt->bits[1]) {
 613                 hwc_debug("  --> get empty\n");
 614                 return -EINVAL;
 615         }
 616         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 617         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 618         return changed;
 619 }
 620
 621 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 622                                struct snd_pcm_hw_rule *rule)
 623 {
 624         struct snd_usb_substream *subs = rule->private;
 625         struct audioformat *fp;
 626         struct snd_interval *it;
 627         unsigned char min_datainterval;
 628         unsigned int pmin;
 629         int changed;
 630
 631         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 632         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 633         min_datainterval = 0xff;
 634         list_for_each_entry(fp, &subs->fmt_list, list) {
 635                 if (!hw_check_valid_format(subs, params, fp))
 636                         continue;
 637                 min_datainterval = min(min_datainterval, fp->datainterval);
 638         }
 639         if (min_datainterval == 0xff) {
 640                 hwc_debug("  --> get empty\n");
 641                 it->empty = 1;
 642                 return -EINVAL;
 643         }
 644         pmin = 125 * (1 << min_datainterval);
 645         changed = 0;
 646         if (it->min < pmin) {
 647                 it->min = pmin;
 648                 it->openmin = 0;
 649                 changed = 1;
 650         }
 651         if (snd_interval_checkempty(it)) {
 652                 it->empty = 1;
 653                 return -EINVAL;
 654         }
 655         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 656         return changed;
 657 }
 658
 659 /*
 660  *  If the device supports unusual bit rates, does the request meet these?
 661  */
 662 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 663                                   struct snd_usb_substream *subs)
 664 {
 665         struct audioformat *fp;
 666         int count = 0, needs_knot = 0;
 667         int err;
 668
 669         list_for_each_entry(fp, &subs->fmt_list, list) {
 670                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 671                         return 0;
 672                 count += fp->nr_rates;
 673                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 674                         needs_knot = 1;
 675         }
 676         if (!needs_knot)
 677                 return 0;
 678
 679         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 680         if (!subs->rate_list.list)
 681                 return -ENOMEM;
 682         subs->rate_list.count = count;
 683         subs->rate_list.mask = 0;
 684         count = 0;
 685         list_for_each_entry(fp, &subs->fmt_list, list) {
 686                 int i;
 687                 for (i = 0; i < fp->nr_rates; i++)
 688                         subs->rate_list.list[count++] = fp->rate_table[i];
 689         }
 690         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 691                                          &subs->rate_list);
 692         if (err < 0)
 693                 return err;
 694
 695         return 0;
 696 }
 697
 698
 699 /*
 700  * set up the runtime hardware information.
 701  */
 702
 703 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 704 {
 705         struct list_head *p;
 706         unsigned int pt, ptmin;
 707         int param_period_time_if_needed;
 708         int err;
 709
 710         runtime->hw.formats = subs->formats;
 711
 712         runtime->hw.rate_min = 0x7fffffff;
 713         runtime->hw.rate_max = 0;
 714         runtime->hw.channels_min = 256;
 715         runtime->hw.channels_max = 0;
 716         runtime->hw.rates = 0;
 717         ptmin = UINT_MAX;
 718         /* check min/max rates and channels */
 719         list_for_each(p, &subs->fmt_list) {
 720                 struct audioformat *fp;
 721                 fp = list_entry(p, struct audioformat, list);
 722                 runtime->hw.rates |= fp->rates;
 723                 if (runtime->hw.rate_min > fp->rate_min)
 724                         runtime->hw.rate_min = fp->rate_min;
 725                 if (runtime->hw.rate_max < fp->rate_max)
 726                         runtime->hw.rate_max = fp->rate_max;
 727                 if (runtime->hw.channels_min > fp->channels)
 728                         runtime->hw.channels_min = fp->channels;
 729                 if (runtime->hw.channels_max < fp->channels)
 730                         runtime->hw.channels_max = fp->channels;
 731                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 732                         /* FIXME: there might be more than one audio formats... */
 733                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 734                                 fp->frame_size;
 735                 }
 736                 pt = 125 * (1 << fp->datainterval);
 737                 ptmin = min(ptmin, pt);
 738         }
 739
 740         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 741         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 742                 /* full speed devices have fixed data packet interval */
 743                 ptmin = 1000;
 744         if (ptmin == 1000)
 745                 /* if period time doesn't go below 1 ms, no rules needed */
 746                 param_period_time_if_needed = -1;
 747         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 748                                      ptmin, UINT_MAX);
 749
 750         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 751                                        hw_rule_rate, subs,
 752                                        SNDRV_PCM_HW_PARAM_FORMAT,
 753                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 754                                        param_period_time_if_needed,
 755                                        -1)) < 0)
 756                 return err;
 757         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 758                                        hw_rule_channels, subs,
 759                                        SNDRV_PCM_HW_PARAM_FORMAT,
 760                                        SNDRV_PCM_HW_PARAM_RATE,
 761                                        param_period_time_if_needed,
 762                                        -1)) < 0)
 763                 return err;
 764         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 765                                        hw_rule_format, subs,
 766                                        SNDRV_PCM_HW_PARAM_RATE,
 767                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 768                                        param_period_time_if_needed,
 769                                        -1)) < 0)
 770                 return err;
 771         if (param_period_time_if_needed >= 0) {
 772                 err = snd_pcm_hw_rule_add(runtime, 0,
 773                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 774                                           hw_rule_period_time, subs,
 775                                           SNDRV_PCM_HW_PARAM_FORMAT,
 776                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 777                                           SNDRV_PCM_HW_PARAM_RATE,
 778                                           -1);
 779                 if (err < 0)
 780                         return err;
 781         }
 782         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 783                 return err;
 784         return 0;
 785 }
 786
 787 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 788 {
 789         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 790         struct snd_pcm_runtime *runtime = substream->runtime;
 791         struct snd_usb_substream *subs = &as->substream[direction];
 792
 793         subs->interface = -1;
 794         subs->altset_idx = 0;
 795         runtime->hw = snd_usb_hardware;
 796         runtime->private_data = subs;
 797         subs->pcm_substream = substream;
 798         return setup_hw_info(runtime, subs);
 799 }
 800
 801 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 802 {
 803         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 804         struct snd_usb_substream *subs = &as->substream[direction];
 805
 806         if (!as->chip->shutdown && subs->interface >= 0) {
 807                 usb_set_interface(subs->dev, subs->interface, 0);
 808                 subs->interface = -1;
 809         }
 810         subs->pcm_substream = NULL;
 811         return 0;
 812 }
 813
 814 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 815 {
 816         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 817 }
 818
 819 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 820 {
 821         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 822 }
 823
 824 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 825 {
 826         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 827 }
 828
 829 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 830 {
 831         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 832 }
 833
 834 static struct snd_pcm_ops snd_usb_playback_ops = {
 835         .open =         snd_usb_playback_open,
 836         .close =        snd_usb_playback_close,
 837         .ioctl =        snd_pcm_lib_ioctl,
 838         .hw_params =    snd_usb_hw_params,
 839         .hw_free =      snd_usb_hw_free,
 840         .prepare =      snd_usb_pcm_prepare,
 841         .trigger =      snd_usb_substream_playback_trigger,
 842         .pointer =      snd_usb_pcm_pointer,
 843         .page =         snd_pcm_lib_get_vmalloc_page,
 844         .mmap =         snd_pcm_lib_mmap_vmalloc,
 845 };
 846
 847 static struct snd_pcm_ops snd_usb_capture_ops = {
 848         .open =         snd_usb_capture_open,
 849         .close =        snd_usb_capture_close,
 850         .ioctl =        snd_pcm_lib_ioctl,
 851         .hw_params =    snd_usb_hw_params,
 852         .hw_free =      snd_usb_hw_free,
 853         .prepare =      snd_usb_pcm_prepare,
 854         .trigger =      snd_usb_substream_capture_trigger,
 855         .pointer =      snd_usb_pcm_pointer,
 856         .page =         snd_pcm_lib_get_vmalloc_page,
 857         .mmap =         snd_pcm_lib_mmap_vmalloc,
 858 };
 859
 860 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 861 {
 862         snd_pcm_set_ops(pcm, stream,
 863                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 864                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 865 }