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 #include "power.h"
  36
  37 /*
  38  * return the current pcm pointer.  just based on the hwptr_done value.
  39  */
  40 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  41 {
  42         struct snd_usb_substream *subs;
  43         unsigned int hwptr_done;
  44
  45         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  46         if (subs->stream->chip->shutdown)
  47                 return SNDRV_PCM_POS_XRUN;
  48         spin_lock(&subs->lock);
  49         hwptr_done = subs->hwptr_done;
  50         spin_unlock(&subs->lock);
  51         return hwptr_done / (substream->runtime->frame_bits >> 3);
  52 }
  53
  54 /*
  55  * find a matching audio format
  56  */
  57 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  58                                        unsigned int rate, unsigned int channels)
  59 {
  60         struct list_head *p;
  61         struct audioformat *found = NULL;
  62         int cur_attr = 0, attr;
  63
  64         list_for_each(p, &subs->fmt_list) {
  65                 struct audioformat *fp;
  66                 fp = list_entry(p, struct audioformat, list);
  67                 if (!(fp->formats & (1uLL << format)))
  68                         continue;
  69                 if (fp->channels != channels)
  70                         continue;
  71                 if (rate < fp->rate_min || rate > fp->rate_max)
  72                         continue;
  73                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  74                         unsigned int i;
  75                         for (i = 0; i < fp->nr_rates; i++)
  76                                 if (fp->rate_table[i] == rate)
  77                                         break;
  78                         if (i >= fp->nr_rates)
  79                                 continue;
  80                 }
  81                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
  82                 if (! found) {
  83                         found = fp;
  84                         cur_attr = attr;
  85                         continue;
  86                 }
  87                 /* avoid async out and adaptive in if the other method
  88                  * supports the same format.
  89                  * this is a workaround for the case like
  90                  * M-audio audiophile USB.
  91                  */
  92                 if (attr != cur_attr) {
  93                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
  94                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
  95                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
  96                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
  97                                 continue;
  98                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
  99                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 100                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 101                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 102                                 found = fp;
 103                                 cur_attr = attr;
 104                                 continue;
 105                         }
 106                 }
 107                 /* find the format with the largest max. packet size */
 108                 if (fp->maxpacksize > found->maxpacksize) {
 109                         found = fp;
 110                         cur_attr = attr;
 111                 }
 112         }
 113         return found;
 114 }
 115
 116 static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 117                          struct usb_host_interface *alts,
 118                          struct audioformat *fmt)
 119 {
 120         struct usb_device *dev = chip->dev;
 121         unsigned int ep;
 122         unsigned char data[1];
 123         int err;
 124
 125         ep = get_endpoint(alts, 0)->bEndpointAddress;
 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 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 141                          struct usb_host_interface *alts,
 142                          struct audioformat *fmt)
 143 {
 144         struct usb_device *dev = chip->dev;
 145         unsigned char data[1];
 146         unsigned int ep;
 147         int err;
 148
 149         ep = get_endpoint(alts, 0)->bEndpointAddress;
 150
 151         data[0] = 1;
 152         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 153                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 154                                    UAC2_EP_CS_PITCH << 8, 0,
 155                                    data, sizeof(data), 1000)) < 0) {
 156                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 157                            dev->devnum, iface, fmt->altsetting);
 158                 return err;
 159         }
 160
 161         return 0;
 162 }
 163
 164 /*
 165  * initialize the pitch control and sample rate
 166  */
 167 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 168                        struct usb_host_interface *alts,
 169                        struct audioformat *fmt)
 170 {
 171         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 172
 173         /* if endpoint doesn't have pitch control, bail out */
 174         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 175                 return 0;
 176
 177         switch (altsd->bInterfaceProtocol) {
 178         case UAC_VERSION_1:
 179         default:
 180                 return init_pitch_v1(chip, iface, alts, fmt);
 181
 182         case UAC_VERSION_2:
 183                 return init_pitch_v2(chip, iface, alts, fmt);
 184         }
 185 }
 186
 187 /*
 188  * find a matching format and set up the interface
 189  */
 190 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 191 {
 192         struct usb_device *dev = subs->dev;
 193         struct usb_host_interface *alts;
 194         struct usb_interface_descriptor *altsd;
 195         struct usb_interface *iface;
 196         unsigned int ep, attr;
 197         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 198         int err;
 199
 200         iface = usb_ifnum_to_if(dev, fmt->iface);
 201         if (WARN_ON(!iface))
 202                 return -EINVAL;
 203         alts = &iface->altsetting[fmt->altset_idx];
 204         altsd = get_iface_desc(alts);
 205         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 206                 return -EINVAL;
 207
 208         if (fmt == subs->cur_audiofmt)
 209                 return 0;
 210
 211         /* close the old interface */
 212         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 213                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 214                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 215                                 dev->devnum, fmt->iface, fmt->altsetting);
 216                         return -EIO;
 217                 }
 218                 subs->interface = -1;
 219                 subs->altset_idx = 0;
 220         }
 221
 222         /* set interface */
 223         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 224                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 225                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 226                                    dev->devnum, fmt->iface, fmt->altsetting);
 227                         return -EIO;
 228                 }
 229                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 230                 subs->interface = fmt->iface;
 231                 subs->altset_idx = fmt->altset_idx;
 232         }
 233
 234         /* create a data pipe */
 235         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 236         if (is_playback)
 237                 subs->datapipe = usb_sndisocpipe(dev, ep);
 238         else
 239                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 240         subs->datainterval = fmt->datainterval;
 241         subs->syncpipe = subs->syncinterval = 0;
 242         subs->maxpacksize = fmt->maxpacksize;
 243         subs->syncmaxsize = 0;
 244         subs->fill_max = 0;
 245
 246         /* we need a sync pipe in async OUT or adaptive IN mode */
 247         /* check the number of EP, since some devices have broken
 248          * descriptors which fool us.  if it has only one EP,
 249          * assume it as adaptive-out or sync-in.
 250          */
 251         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 252         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 253              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 254             altsd->bNumEndpoints >= 2) {
 255                 /* check sync-pipe endpoint */
 256                 /* ... and check descriptor size before accessing bSynchAddress
 257                    because there is a version of the SB Audigy 2 NX firmware lacking
 258                    the audio fields in the endpoint descriptors */
 259                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 260                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 261                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 262                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 263                                    dev->devnum, fmt->iface, fmt->altsetting);
 264                         return -EINVAL;
 265                 }
 266                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 267                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 268                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 269                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 270                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 271                                    dev->devnum, fmt->iface, fmt->altsetting);
 272                         return -EINVAL;
 273                 }
 274                 ep &= USB_ENDPOINT_NUMBER_MASK;
 275                 if (is_playback)
 276                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 277                 else
 278                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 279                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 280                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 281                     get_endpoint(alts, 1)->bRefresh <= 9)
 282                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 283                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 284                         subs->syncinterval = 1;
 285                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 286                          get_endpoint(alts, 1)->bInterval <= 16)
 287                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 288                 else
 289                         subs->syncinterval = 3;
 290                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 291         }
 292
 293         /* always fill max packet size */
 294         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 295                 subs->fill_max = 1;
 296
 297         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 298                 return err;
 299
 300         subs->cur_audiofmt = fmt;
 301
 302         snd_usb_set_format_quirk(subs, fmt);
 303
 304 #if 0
 305         printk(KERN_DEBUG
 306                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 307                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 308         printk(KERN_DEBUG
 309                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 310                subs->datapipe, subs->syncpipe);
 311 #endif
 312
 313         return 0;
 314 }
 315
 316 /*
 317  * hw_params callback
 318  *
 319  * allocate a buffer and set the given audio format.
 320  *
 321  * so far we use a physically linear buffer although packetize transfer
 322  * doesn't need a continuous area.
 323  * if sg buffer is supported on the later version of alsa, we'll follow
 324  * that.
 325  */
 326 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 327                              struct snd_pcm_hw_params *hw_params)
 328 {
 329         struct snd_usb_substream *subs = substream->runtime->private_data;
 330         struct audioformat *fmt;
 331         unsigned int channels, rate, format;
 332         int ret, changed;
 333
 334         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 335                                                params_buffer_bytes(hw_params));
 336         if (ret < 0)
 337                 return ret;
 338
 339         format = params_format(hw_params);
 340         rate = params_rate(hw_params);
 341         channels = params_channels(hw_params);
 342         fmt = find_format(subs, format, rate, channels);
 343         if (!fmt) {
 344                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 345                            format, rate, channels);
 346                 return -EINVAL;
 347         }
 348
 349         changed = subs->cur_audiofmt != fmt ||
 350                 subs->period_bytes != params_period_bytes(hw_params) ||
 351                 subs->cur_rate != rate;
 352
 353         mutex_lock(&subs->stream->chip->shutdown_mutex);
 354         if (subs->stream->chip->shutdown) {
 355                 ret = -ENODEV;
 356                 goto unlock;
 357         }
 358         if ((ret = set_format(subs, fmt)) < 0)
 359                 goto unlock;
 360
 361         if (subs->cur_rate != rate) {
 362                 struct usb_host_interface *alts;
 363                 struct usb_interface *iface;
 364                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 365                 alts = &iface->altsetting[fmt->altset_idx];
 366                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 367                 if (ret < 0)
 368                         goto unlock;
 369                 subs->cur_rate = rate;
 370         }
 371
 372         if (changed) {
 373                 /* format changed */
 374                 snd_usb_release_substream_urbs(subs, 0);
 375                 /* influenced: period_bytes, channels, rate, format, */
 376                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 377                                                   params_rate(hw_params),
 378                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 379                                                         params_channels(hw_params));
 380         }
 381
 382 unlock:
 383         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 384         return ret;
 385 }
 386
 387 /*
 388  * hw_free callback
 389  *
 390  * reset the audio format and release the buffer
 391  */
 392 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 393 {
 394         struct snd_usb_substream *subs = substream->runtime->private_data;
 395
 396         subs->cur_audiofmt = NULL;
 397         subs->cur_rate = 0;
 398         subs->period_bytes = 0;
 399         mutex_lock(&subs->stream->chip->shutdown_mutex);
 400         snd_usb_release_substream_urbs(subs, 0);
 401         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 402         return snd_pcm_lib_free_vmalloc_buffer(substream);
 403 }
 404
 405 /*
 406  * prepare callback
 407  *
 408  * only a few subtle things...
 409  */
 410 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 411 {
 412         struct snd_pcm_runtime *runtime = substream->runtime;
 413         struct snd_usb_substream *subs = runtime->private_data;
 414         int ret = 0;
 415
 416         if (! subs->cur_audiofmt) {
 417                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 418                 return -ENXIO;
 419         }
 420
 421         mutex_lock(&subs->stream->chip->shutdown_mutex);
 422         if (subs->stream->chip->shutdown) {
 423                 ret = -ENODEV;
 424                 goto unlock;
 425         }
 426         /* some unit conversions in runtime */
 427         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 428         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 429
 430         /* reset the pointer */
 431         subs->hwptr_done = 0;
 432         subs->transfer_done = 0;
 433         subs->phase = 0;
 434         runtime->delay = 0;
 435
 436         ret = snd_usb_substream_prepare(subs, runtime);
 437  unlock:
 438         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 439         return ret;
 440 }
 441
 442 static struct snd_pcm_hardware snd_usb_hardware =
 443 {
 444         .info =                 SNDRV_PCM_INFO_MMAP |
 445                                 SNDRV_PCM_INFO_MMAP_VALID |
 446                                 SNDRV_PCM_INFO_BATCH |
 447                                 SNDRV_PCM_INFO_INTERLEAVED |
 448                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 449                                 SNDRV_PCM_INFO_PAUSE,
 450         .buffer_bytes_max =     1024 * 1024,
 451         .period_bytes_min =     64,
 452         .period_bytes_max =     512 * 1024,
 453         .periods_min =          2,
 454         .periods_max =          1024,
 455 };
 456
 457 static int hw_check_valid_format(struct snd_usb_substream *subs,
 458                                  struct snd_pcm_hw_params *params,
 459                                  struct audioformat *fp)
 460 {
 461         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 462         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 463         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 464         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 465         struct snd_mask check_fmts;
 466         unsigned int ptime;
 467
 468         /* check the format */
 469         snd_mask_none(&check_fmts);
 470         check_fmts.bits[0] = (u32)fp->formats;
 471         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 472         snd_mask_intersect(&check_fmts, fmts);
 473         if (snd_mask_empty(&check_fmts)) {
 474                 hwc_debug("   > check: no supported format %d\n", fp->format);
 475                 return 0;
 476         }
 477         /* check the channels */
 478         if (fp->channels < ct->min || fp->channels > ct->max) {
 479                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 480                 return 0;
 481         }
 482         /* check the rate is within the range */
 483         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 484                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 485                 return 0;
 486         }
 487         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 488                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 489                 return 0;
 490         }
 491         /* check whether the period time is >= the data packet interval */
 492         if (subs->speed != USB_SPEED_FULL) {
 493                 ptime = 125 * (1 << fp->datainterval);
 494                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 495                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 496                         return 0;
 497                 }
 498         }
 499         return 1;
 500 }
 501
 502 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 503                         struct snd_pcm_hw_rule *rule)
 504 {
 505         struct snd_usb_substream *subs = rule->private;
 506         struct list_head *p;
 507         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 508         unsigned int rmin, rmax;
 509         int changed;
 510
 511         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 512         changed = 0;
 513         rmin = rmax = 0;
 514         list_for_each(p, &subs->fmt_list) {
 515                 struct audioformat *fp;
 516                 fp = list_entry(p, struct audioformat, list);
 517                 if (!hw_check_valid_format(subs, params, fp))
 518                         continue;
 519                 if (changed++) {
 520                         if (rmin > fp->rate_min)
 521                                 rmin = fp->rate_min;
 522                         if (rmax < fp->rate_max)
 523                                 rmax = fp->rate_max;
 524                 } else {
 525                         rmin = fp->rate_min;
 526                         rmax = fp->rate_max;
 527                 }
 528         }
 529
 530         if (!changed) {
 531                 hwc_debug("  --> get empty\n");
 532                 it->empty = 1;
 533                 return -EINVAL;
 534         }
 535
 536         changed = 0;
 537         if (it->min < rmin) {
 538                 it->min = rmin;
 539                 it->openmin = 0;
 540                 changed = 1;
 541         }
 542         if (it->max > rmax) {
 543                 it->max = rmax;
 544                 it->openmax = 0;
 545                 changed = 1;
 546         }
 547         if (snd_interval_checkempty(it)) {
 548                 it->empty = 1;
 549                 return -EINVAL;
 550         }
 551         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 552         return changed;
 553 }
 554
 555
 556 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 557                             struct snd_pcm_hw_rule *rule)
 558 {
 559         struct snd_usb_substream *subs = rule->private;
 560         struct list_head *p;
 561         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 562         unsigned int rmin, rmax;
 563         int changed;
 564
 565         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 566         changed = 0;
 567         rmin = rmax = 0;
 568         list_for_each(p, &subs->fmt_list) {
 569                 struct audioformat *fp;
 570                 fp = list_entry(p, struct audioformat, list);
 571                 if (!hw_check_valid_format(subs, params, fp))
 572                         continue;
 573                 if (changed++) {
 574                         if (rmin > fp->channels)
 575                                 rmin = fp->channels;
 576                         if (rmax < fp->channels)
 577                                 rmax = fp->channels;
 578                 } else {
 579                         rmin = fp->channels;
 580                         rmax = fp->channels;
 581                 }
 582         }
 583
 584         if (!changed) {
 585                 hwc_debug("  --> get empty\n");
 586                 it->empty = 1;
 587                 return -EINVAL;
 588         }
 589
 590         changed = 0;
 591         if (it->min < rmin) {
 592                 it->min = rmin;
 593                 it->openmin = 0;
 594                 changed = 1;
 595         }
 596         if (it->max > rmax) {
 597                 it->max = rmax;
 598                 it->openmax = 0;
 599                 changed = 1;
 600         }
 601         if (snd_interval_checkempty(it)) {
 602                 it->empty = 1;
 603                 return -EINVAL;
 604         }
 605         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 606         return changed;
 607 }
 608
 609 static int hw_rule_format(struct snd_pcm_hw_params *params,
 610                           struct snd_pcm_hw_rule *rule)
 611 {
 612         struct snd_usb_substream *subs = rule->private;
 613         struct list_head *p;
 614         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 615         u64 fbits;
 616         u32 oldbits[2];
 617         int changed;
 618
 619         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 620         fbits = 0;
 621         list_for_each(p, &subs->fmt_list) {
 622                 struct audioformat *fp;
 623                 fp = list_entry(p, struct audioformat, list);
 624                 if (!hw_check_valid_format(subs, params, fp))
 625                         continue;
 626                 fbits |= fp->formats;
 627         }
 628
 629         oldbits[0] = fmt->bits[0];
 630         oldbits[1] = fmt->bits[1];
 631         fmt->bits[0] &= (u32)fbits;
 632         fmt->bits[1] &= (u32)(fbits >> 32);
 633         if (!fmt->bits[0] && !fmt->bits[1]) {
 634                 hwc_debug("  --> get empty\n");
 635                 return -EINVAL;
 636         }
 637         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 638         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 639         return changed;
 640 }
 641
 642 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 643                                struct snd_pcm_hw_rule *rule)
 644 {
 645         struct snd_usb_substream *subs = rule->private;
 646         struct audioformat *fp;
 647         struct snd_interval *it;
 648         unsigned char min_datainterval;
 649         unsigned int pmin;
 650         int changed;
 651
 652         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 653         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 654         min_datainterval = 0xff;
 655         list_for_each_entry(fp, &subs->fmt_list, list) {
 656                 if (!hw_check_valid_format(subs, params, fp))
 657                         continue;
 658                 min_datainterval = min(min_datainterval, fp->datainterval);
 659         }
 660         if (min_datainterval == 0xff) {
 661                 hwc_debug("  --> get empty\n");
 662                 it->empty = 1;
 663                 return -EINVAL;
 664         }
 665         pmin = 125 * (1 << min_datainterval);
 666         changed = 0;
 667         if (it->min < pmin) {
 668                 it->min = pmin;
 669                 it->openmin = 0;
 670                 changed = 1;
 671         }
 672         if (snd_interval_checkempty(it)) {
 673                 it->empty = 1;
 674                 return -EINVAL;
 675         }
 676         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 677         return changed;
 678 }
 679
 680 /*
 681  *  If the device supports unusual bit rates, does the request meet these?
 682  */
 683 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 684                                   struct snd_usb_substream *subs)
 685 {
 686         struct audioformat *fp;
 687         int count = 0, needs_knot = 0;
 688         int err;
 689
 690         kfree(subs->rate_list.list);
 691         subs->rate_list.list = NULL;
 692
 693         list_for_each_entry(fp, &subs->fmt_list, list) {
 694                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 695                         return 0;
 696                 count += fp->nr_rates;
 697                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 698                         needs_knot = 1;
 699         }
 700         if (!needs_knot)
 701                 return 0;
 702
 703         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
 704         if (!subs->rate_list.list)
 705                 return -ENOMEM;
 706         subs->rate_list.count = count;
 707         subs->rate_list.mask = 0;
 708         count = 0;
 709         list_for_each_entry(fp, &subs->fmt_list, list) {
 710                 int i;
 711                 for (i = 0; i < fp->nr_rates; i++)
 712                         subs->rate_list.list[count++] = fp->rate_table[i];
 713         }
 714         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 715                                          &subs->rate_list);
 716         if (err < 0)
 717                 return err;
 718
 719         return 0;
 720 }
 721
 722
 723 /*
 724  * set up the runtime hardware information.
 725  */
 726
 727 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 728 {
 729         struct list_head *p;
 730         unsigned int pt, ptmin;
 731         int param_period_time_if_needed;
 732         int err;
 733
 734         runtime->hw.formats = subs->formats;
 735
 736         runtime->hw.rate_min = 0x7fffffff;
 737         runtime->hw.rate_max = 0;
 738         runtime->hw.channels_min = 256;
 739         runtime->hw.channels_max = 0;
 740         runtime->hw.rates = 0;
 741         ptmin = UINT_MAX;
 742         /* check min/max rates and channels */
 743         list_for_each(p, &subs->fmt_list) {
 744                 struct audioformat *fp;
 745                 fp = list_entry(p, struct audioformat, list);
 746                 runtime->hw.rates |= fp->rates;
 747                 if (runtime->hw.rate_min > fp->rate_min)
 748                         runtime->hw.rate_min = fp->rate_min;
 749                 if (runtime->hw.rate_max < fp->rate_max)
 750                         runtime->hw.rate_max = fp->rate_max;
 751                 if (runtime->hw.channels_min > fp->channels)
 752                         runtime->hw.channels_min = fp->channels;
 753                 if (runtime->hw.channels_max < fp->channels)
 754                         runtime->hw.channels_max = fp->channels;
 755                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 756                         /* FIXME: there might be more than one audio formats... */
 757                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 758                                 fp->frame_size;
 759                 }
 760                 pt = 125 * (1 << fp->datainterval);
 761                 ptmin = min(ptmin, pt);
 762         }
 763         err = snd_usb_autoresume(subs->stream->chip);
 764         if (err < 0)
 765                 return err;
 766
 767         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 768         if (subs->speed == USB_SPEED_FULL)
 769                 /* full speed devices have fixed data packet interval */
 770                 ptmin = 1000;
 771         if (ptmin == 1000)
 772                 /* if period time doesn't go below 1 ms, no rules needed */
 773                 param_period_time_if_needed = -1;
 774         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 775                                      ptmin, UINT_MAX);
 776
 777         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 778                                        hw_rule_rate, subs,
 779                                        SNDRV_PCM_HW_PARAM_FORMAT,
 780                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 781                                        param_period_time_if_needed,
 782                                        -1)) < 0)
 783                 goto rep_err;
 784         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 785                                        hw_rule_channels, subs,
 786                                        SNDRV_PCM_HW_PARAM_FORMAT,
 787                                        SNDRV_PCM_HW_PARAM_RATE,
 788                                        param_period_time_if_needed,
 789                                        -1)) < 0)
 790                 goto rep_err;
 791         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 792                                        hw_rule_format, subs,
 793                                        SNDRV_PCM_HW_PARAM_RATE,
 794                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 795                                        param_period_time_if_needed,
 796                                        -1)) < 0)
 797                 goto rep_err;
 798         if (param_period_time_if_needed >= 0) {
 799                 err = snd_pcm_hw_rule_add(runtime, 0,
 800                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 801                                           hw_rule_period_time, subs,
 802                                           SNDRV_PCM_HW_PARAM_FORMAT,
 803                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 804                                           SNDRV_PCM_HW_PARAM_RATE,
 805                                           -1);
 806                 if (err < 0)
 807                         goto rep_err;
 808         }
 809         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 810                 goto rep_err;
 811         return 0;
 812
 813 rep_err:
 814         snd_usb_autosuspend(subs->stream->chip);
 815         return err;
 816 }
 817
 818 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 819 {
 820         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 821         struct snd_pcm_runtime *runtime = substream->runtime;
 822         struct snd_usb_substream *subs = &as->substream[direction];
 823
 824         subs->interface = -1;
 825         subs->altset_idx = 0;
 826         runtime->hw = snd_usb_hardware;
 827         runtime->private_data = subs;
 828         subs->pcm_substream = substream;
 829         /* runtime PM is also done there */
 830         return setup_hw_info(runtime, subs);
 831 }
 832
 833 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 834 {
 835         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 836         struct snd_usb_substream *subs = &as->substream[direction];
 837
 838         if (!as->chip->shutdown && subs->interface >= 0) {
 839                 usb_set_interface(subs->dev, subs->interface, 0);
 840                 subs->interface = -1;
 841         }
 842         subs->pcm_substream = NULL;
 843         snd_usb_autosuspend(subs->stream->chip);
 844         return 0;
 845 }
 846
 847 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 848 {
 849         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 850 }
 851
 852 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 853 {
 854         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 855 }
 856
 857 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 858 {
 859         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 860 }
 861
 862 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 863 {
 864         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 865 }
 866
 867 static struct snd_pcm_ops snd_usb_playback_ops = {
 868         .open =         snd_usb_playback_open,
 869         .close =        snd_usb_playback_close,
 870         .ioctl =        snd_pcm_lib_ioctl,
 871         .hw_params =    snd_usb_hw_params,
 872         .hw_free =      snd_usb_hw_free,
 873         .prepare =      snd_usb_pcm_prepare,
 874         .trigger =      snd_usb_substream_playback_trigger,
 875         .pointer =      snd_usb_pcm_pointer,
 876         .page =         snd_pcm_lib_get_vmalloc_page,
 877         .mmap =         snd_pcm_lib_mmap_vmalloc,
 878 };
 879
 880 static struct snd_pcm_ops snd_usb_capture_ops = {
 881         .open =         snd_usb_capture_open,
 882         .close =        snd_usb_capture_close,
 883         .ioctl =        snd_pcm_lib_ioctl,
 884         .hw_params =    snd_usb_hw_params,
 885         .hw_free =      snd_usb_hw_free,
 886         .prepare =      snd_usb_pcm_prepare,
 887         .trigger =      snd_usb_substream_capture_trigger,
 888         .pointer =      snd_usb_pcm_pointer,
 889         .page =         snd_pcm_lib_get_vmalloc_page,
 890         .mmap =         snd_pcm_lib_mmap_vmalloc,
 891 };
 892
 893 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 894 {
 895         snd_pcm_set_ops(pcm, stream,
 896                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 897                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 898 }