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 "endpoint.h"
  32 #include "helper.h"
  33 #include "pcm.h"
  34 #include "clock.h"
  35 #include "power.h"
  36
  37 /* return the estimated delay based on USB frame counters */
  38 snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
  39                                     unsigned int rate)
  40 {
  41         int current_frame_number;
  42         int frame_diff;
  43         int est_delay;
  44
  45         current_frame_number = usb_get_current_frame_number(subs->dev);
  46         /*
  47          * HCD implementations use different widths, use lower 8 bits.
  48          * The delay will be managed up to 256ms, which is more than
  49          * enough
  50          */
  51         frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
  52
  53         /* Approximation based on number of samples per USB frame (ms),
  54            some truncation for 44.1 but the estimate is good enough */
  55         est_delay =  subs->last_delay - (frame_diff * rate / 1000);
  56         if (est_delay < 0)
  57                 est_delay = 0;
  58         return est_delay;
  59 }
  60
  61 /*
  62  * return the current pcm pointer.  just based on the hwptr_done value.
  63  */
  64 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
  65 {
  66         struct snd_usb_substream *subs;
  67         unsigned int hwptr_done;
  68
  69         subs = (struct snd_usb_substream *)substream->runtime->private_data;
  70         spin_lock(&subs->lock);
  71         hwptr_done = subs->hwptr_done;
  72         substream->runtime->delay = snd_usb_pcm_delay(subs,
  73                                                 substream->runtime->rate);
  74         spin_unlock(&subs->lock);
  75         return hwptr_done / (substream->runtime->frame_bits >> 3);
  76 }
  77
  78 /*
  79  * find a matching audio format
  80  */
  81 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
  82                                        unsigned int rate, unsigned int channels)
  83 {
  84         struct list_head *p;
  85         struct audioformat *found = NULL;
  86         int cur_attr = 0, attr;
  87
  88         list_for_each(p, &subs->fmt_list) {
  89                 struct audioformat *fp;
  90                 fp = list_entry(p, struct audioformat, list);
  91                 if (!(fp->formats & (1uLL << format)))
  92                         continue;
  93                 if (fp->channels != channels)
  94                         continue;
  95                 if (rate < fp->rate_min || rate > fp->rate_max)
  96                         continue;
  97                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
  98                         unsigned int i;
  99                         for (i = 0; i < fp->nr_rates; i++)
 100                                 if (fp->rate_table[i] == rate)
 101                                         break;
 102                         if (i >= fp->nr_rates)
 103                                 continue;
 104                 }
 105                 attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
 106                 if (! found) {
 107                         found = fp;
 108                         cur_attr = attr;
 109                         continue;
 110                 }
 111                 /* avoid async out and adaptive in if the other method
 112                  * supports the same format.
 113                  * this is a workaround for the case like
 114                  * M-audio audiophile USB.
 115                  */
 116                 if (attr != cur_attr) {
 117                         if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 118                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 119                             (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 120                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
 121                                 continue;
 122                         if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
 123                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 124                             (cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
 125                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
 126                                 found = fp;
 127                                 cur_attr = attr;
 128                                 continue;
 129                         }
 130                 }
 131                 /* find the format with the largest max. packet size */
 132                 if (fp->maxpacksize > found->maxpacksize) {
 133                         found = fp;
 134                         cur_attr = attr;
 135                 }
 136         }
 137         return found;
 138 }
 139
 140 static int init_pitch_v1(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 int ep;
 146         unsigned char data[1];
 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), UAC_SET_CUR,
 153                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 154                                    UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 155                                    data, sizeof(data))) < 0) {
 156                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
 157                            dev->devnum, iface, ep);
 158                 return err;
 159         }
 160
 161         return 0;
 162 }
 163
 164 static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 165                          struct usb_host_interface *alts,
 166                          struct audioformat *fmt)
 167 {
 168         struct usb_device *dev = chip->dev;
 169         unsigned char data[1];
 170         unsigned int ep;
 171         int err;
 172
 173         ep = get_endpoint(alts, 0)->bEndpointAddress;
 174
 175         data[0] = 1;
 176         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
 177                                    USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 178                                    UAC2_EP_CS_PITCH << 8, 0,
 179                                    data, sizeof(data))) < 0) {
 180                 snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
 181                            dev->devnum, iface, fmt->altsetting);
 182                 return err;
 183         }
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * initialize the pitch control and sample rate
 190  */
 191 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 192                        struct usb_host_interface *alts,
 193                        struct audioformat *fmt)
 194 {
 195         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 196
 197         /* if endpoint doesn't have pitch control, bail out */
 198         if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 199                 return 0;
 200
 201         switch (altsd->bInterfaceProtocol) {
 202         case UAC_VERSION_1:
 203         default:
 204                 return init_pitch_v1(chip, iface, alts, fmt);
 205
 206         case UAC_VERSION_2:
 207                 return init_pitch_v2(chip, iface, alts, fmt);
 208         }
 209 }
 210
 211 /*
 212  * find a matching format and set up the interface
 213  */
 214 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
 215 {
 216         struct usb_device *dev = subs->dev;
 217         struct usb_host_interface *alts;
 218         struct usb_interface_descriptor *altsd;
 219         struct usb_interface *iface;
 220         unsigned int ep, attr;
 221         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
 222         int err;
 223
 224         iface = usb_ifnum_to_if(dev, fmt->iface);
 225         if (WARN_ON(!iface))
 226                 return -EINVAL;
 227         alts = &iface->altsetting[fmt->altset_idx];
 228         altsd = get_iface_desc(alts);
 229         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
 230                 return -EINVAL;
 231
 232         if (fmt == subs->cur_audiofmt)
 233                 return 0;
 234
 235         /* close the old interface */
 236         if (subs->interface >= 0 && subs->interface != fmt->iface) {
 237                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
 238                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
 239                                 dev->devnum, fmt->iface, fmt->altsetting);
 240                         return -EIO;
 241                 }
 242                 subs->interface = -1;
 243                 subs->altset_idx = 0;
 244         }
 245
 246         /* set interface */
 247         if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
 248                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
 249                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
 250                                    dev->devnum, fmt->iface, fmt->altsetting);
 251                         return -EIO;
 252                 }
 253                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
 254                 subs->interface = fmt->iface;
 255                 subs->altset_idx = fmt->altset_idx;
 256         }
 257
 258         /* create a data pipe */
 259         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
 260         if (is_playback)
 261                 subs->datapipe = usb_sndisocpipe(dev, ep);
 262         else
 263                 subs->datapipe = usb_rcvisocpipe(dev, ep);
 264         subs->datainterval = fmt->datainterval;
 265         subs->syncpipe = subs->syncinterval = 0;
 266         subs->maxpacksize = fmt->maxpacksize;
 267         subs->syncmaxsize = 0;
 268         subs->fill_max = 0;
 269
 270         /* we need a sync pipe in async OUT or adaptive IN mode */
 271         /* check the number of EP, since some devices have broken
 272          * descriptors which fool us.  if it has only one EP,
 273          * assume it as adaptive-out or sync-in.
 274          */
 275         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 276         if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
 277              (! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
 278             altsd->bNumEndpoints >= 2) {
 279                 /* check sync-pipe endpoint */
 280                 /* ... and check descriptor size before accessing bSynchAddress
 281                    because there is a version of the SB Audigy 2 NX firmware lacking
 282                    the audio fields in the endpoint descriptors */
 283                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
 284                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 285                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
 286                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 287                                    dev->devnum, fmt->iface, fmt->altsetting);
 288                         return -EINVAL;
 289                 }
 290                 ep = get_endpoint(alts, 1)->bEndpointAddress;
 291                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 292                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
 293                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
 294                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
 295                                    dev->devnum, fmt->iface, fmt->altsetting);
 296                         return -EINVAL;
 297                 }
 298                 ep &= USB_ENDPOINT_NUMBER_MASK;
 299                 if (is_playback)
 300                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
 301                 else
 302                         subs->syncpipe = usb_sndisocpipe(dev, ep);
 303                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 304                     get_endpoint(alts, 1)->bRefresh >= 1 &&
 305                     get_endpoint(alts, 1)->bRefresh <= 9)
 306                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
 307                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 308                         subs->syncinterval = 1;
 309                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
 310                          get_endpoint(alts, 1)->bInterval <= 16)
 311                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
 312                 else
 313                         subs->syncinterval = 3;
 314                 subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
 315         }
 316
 317         /* always fill max packet size */
 318         if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
 319                 subs->fill_max = 1;
 320
 321         if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
 322                 return err;
 323
 324         subs->cur_audiofmt = fmt;
 325
 326         snd_usb_set_format_quirk(subs, fmt);
 327
 328 #if 0
 329         printk(KERN_DEBUG
 330                "setting done: format = %d, rate = %d..%d, channels = %d\n",
 331                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
 332         printk(KERN_DEBUG
 333                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
 334                subs->datapipe, subs->syncpipe);
 335 #endif
 336
 337         return 0;
 338 }
 339
 340 /*
 341  * hw_params callback
 342  *
 343  * allocate a buffer and set the given audio format.
 344  *
 345  * so far we use a physically linear buffer although packetize transfer
 346  * doesn't need a continuous area.
 347  * if sg buffer is supported on the later version of alsa, we'll follow
 348  * that.
 349  */
 350 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 351                              struct snd_pcm_hw_params *hw_params)
 352 {
 353         struct snd_usb_substream *subs = substream->runtime->private_data;
 354         struct audioformat *fmt;
 355         unsigned int channels, rate, format;
 356         int ret, changed;
 357
 358         ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 359                                                params_buffer_bytes(hw_params));
 360         if (ret < 0)
 361                 return ret;
 362
 363         format = params_format(hw_params);
 364         rate = params_rate(hw_params);
 365         channels = params_channels(hw_params);
 366         fmt = find_format(subs, format, rate, channels);
 367         if (!fmt) {
 368                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
 369                            format, rate, channels);
 370                 return -EINVAL;
 371         }
 372
 373         changed = subs->cur_audiofmt != fmt ||
 374                 subs->period_bytes != params_period_bytes(hw_params) ||
 375                 subs->cur_rate != rate;
 376         if ((ret = set_format(subs, fmt)) < 0)
 377                 return ret;
 378
 379         if (subs->cur_rate != rate) {
 380                 struct usb_host_interface *alts;
 381                 struct usb_interface *iface;
 382                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
 383                 alts = &iface->altsetting[fmt->altset_idx];
 384                 ret = snd_usb_init_sample_rate(subs->stream->chip, subs->interface, alts, fmt, rate);
 385                 if (ret < 0)
 386                         return ret;
 387                 subs->cur_rate = rate;
 388         }
 389
 390         if (changed) {
 391                 mutex_lock(&subs->stream->chip->shutdown_mutex);
 392                 /* format changed */
 393                 snd_usb_release_substream_urbs(subs, 0);
 394                 /* influenced: period_bytes, channels, rate, format, */
 395                 ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
 396                                                   params_rate(hw_params),
 397                                                   snd_pcm_format_physical_width(params_format(hw_params)) *
 398                                                         params_channels(hw_params));
 399                 mutex_unlock(&subs->stream->chip->shutdown_mutex);
 400         }
 401
 402         return ret;
 403 }
 404
 405 /*
 406  * hw_free callback
 407  *
 408  * reset the audio format and release the buffer
 409  */
 410 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 411 {
 412         struct snd_usb_substream *subs = substream->runtime->private_data;
 413
 414         subs->cur_audiofmt = NULL;
 415         subs->cur_rate = 0;
 416         subs->period_bytes = 0;
 417         mutex_lock(&subs->stream->chip->shutdown_mutex);
 418         snd_usb_release_substream_urbs(subs, 0);
 419         mutex_unlock(&subs->stream->chip->shutdown_mutex);
 420         return snd_pcm_lib_free_vmalloc_buffer(substream);
 421 }
 422
 423 /*
 424  * prepare callback
 425  *
 426  * only a few subtle things...
 427  */
 428 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 429 {
 430         struct snd_pcm_runtime *runtime = substream->runtime;
 431         struct snd_usb_substream *subs = runtime->private_data;
 432
 433         if (! subs->cur_audiofmt) {
 434                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
 435                 return -ENXIO;
 436         }
 437
 438         /* some unit conversions in runtime */
 439         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
 440         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
 441
 442         /* reset the pointer */
 443         subs->hwptr_done = 0;
 444         subs->transfer_done = 0;
 445         subs->phase = 0;
 446         subs->last_delay = 0;
 447         subs->last_frame_number = 0;
 448         runtime->delay = 0;
 449
 450         return snd_usb_substream_prepare(subs, runtime);
 451 }
 452
 453 static struct snd_pcm_hardware snd_usb_hardware =
 454 {
 455         .info =                 SNDRV_PCM_INFO_MMAP |
 456                                 SNDRV_PCM_INFO_MMAP_VALID |
 457                                 SNDRV_PCM_INFO_BATCH |
 458                                 SNDRV_PCM_INFO_INTERLEAVED |
 459                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 460                                 SNDRV_PCM_INFO_PAUSE,
 461         .buffer_bytes_max =     1024 * 1024,
 462         .period_bytes_min =     64,
 463         .period_bytes_max =     512 * 1024,
 464         .periods_min =          2,
 465         .periods_max =          1024,
 466 };
 467
 468 static int hw_check_valid_format(struct snd_usb_substream *subs,
 469                                  struct snd_pcm_hw_params *params,
 470                                  struct audioformat *fp)
 471 {
 472         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 473         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 474         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 475         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 476         struct snd_mask check_fmts;
 477         unsigned int ptime;
 478
 479         /* check the format */
 480         snd_mask_none(&check_fmts);
 481         check_fmts.bits[0] = (u32)fp->formats;
 482         check_fmts.bits[1] = (u32)(fp->formats >> 32);
 483         snd_mask_intersect(&check_fmts, fmts);
 484         if (snd_mask_empty(&check_fmts)) {
 485                 hwc_debug("   > check: no supported format %d\n", fp->format);
 486                 return 0;
 487         }
 488         /* check the channels */
 489         if (fp->channels < ct->min || fp->channels > ct->max) {
 490                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
 491                 return 0;
 492         }
 493         /* check the rate is within the range */
 494         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
 495                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
 496                 return 0;
 497         }
 498         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
 499                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
 500                 return 0;
 501         }
 502         /* check whether the period time is >= the data packet interval */
 503         if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL) {
 504                 ptime = 125 * (1 << fp->datainterval);
 505                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
 506                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
 507                         return 0;
 508                 }
 509         }
 510         return 1;
 511 }
 512
 513 static int hw_rule_rate(struct snd_pcm_hw_params *params,
 514                         struct snd_pcm_hw_rule *rule)
 515 {
 516         struct snd_usb_substream *subs = rule->private;
 517         struct list_head *p;
 518         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 519         unsigned int rmin, rmax;
 520         int changed;
 521
 522         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
 523         changed = 0;
 524         rmin = rmax = 0;
 525         list_for_each(p, &subs->fmt_list) {
 526                 struct audioformat *fp;
 527                 fp = list_entry(p, struct audioformat, list);
 528                 if (!hw_check_valid_format(subs, params, fp))
 529                         continue;
 530                 if (changed++) {
 531                         if (rmin > fp->rate_min)
 532                                 rmin = fp->rate_min;
 533                         if (rmax < fp->rate_max)
 534                                 rmax = fp->rate_max;
 535                 } else {
 536                         rmin = fp->rate_min;
 537                         rmax = fp->rate_max;
 538                 }
 539         }
 540
 541         if (!changed) {
 542                 hwc_debug("  --> get empty\n");
 543                 it->empty = 1;
 544                 return -EINVAL;
 545         }
 546
 547         changed = 0;
 548         if (it->min < rmin) {
 549                 it->min = rmin;
 550                 it->openmin = 0;
 551                 changed = 1;
 552         }
 553         if (it->max > rmax) {
 554                 it->max = rmax;
 555                 it->openmax = 0;
 556                 changed = 1;
 557         }
 558         if (snd_interval_checkempty(it)) {
 559                 it->empty = 1;
 560                 return -EINVAL;
 561         }
 562         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 563         return changed;
 564 }
 565
 566
 567 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 568                             struct snd_pcm_hw_rule *rule)
 569 {
 570         struct snd_usb_substream *subs = rule->private;
 571         struct list_head *p;
 572         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 573         unsigned int rmin, rmax;
 574         int changed;
 575
 576         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
 577         changed = 0;
 578         rmin = rmax = 0;
 579         list_for_each(p, &subs->fmt_list) {
 580                 struct audioformat *fp;
 581                 fp = list_entry(p, struct audioformat, list);
 582                 if (!hw_check_valid_format(subs, params, fp))
 583                         continue;
 584                 if (changed++) {
 585                         if (rmin > fp->channels)
 586                                 rmin = fp->channels;
 587                         if (rmax < fp->channels)
 588                                 rmax = fp->channels;
 589                 } else {
 590                         rmin = fp->channels;
 591                         rmax = fp->channels;
 592                 }
 593         }
 594
 595         if (!changed) {
 596                 hwc_debug("  --> get empty\n");
 597                 it->empty = 1;
 598                 return -EINVAL;
 599         }
 600
 601         changed = 0;
 602         if (it->min < rmin) {
 603                 it->min = rmin;
 604                 it->openmin = 0;
 605                 changed = 1;
 606         }
 607         if (it->max > rmax) {
 608                 it->max = rmax;
 609                 it->openmax = 0;
 610                 changed = 1;
 611         }
 612         if (snd_interval_checkempty(it)) {
 613                 it->empty = 1;
 614                 return -EINVAL;
 615         }
 616         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
 617         return changed;
 618 }
 619
 620 static int hw_rule_format(struct snd_pcm_hw_params *params,
 621                           struct snd_pcm_hw_rule *rule)
 622 {
 623         struct snd_usb_substream *subs = rule->private;
 624         struct list_head *p;
 625         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 626         u64 fbits;
 627         u32 oldbits[2];
 628         int changed;
 629
 630         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
 631         fbits = 0;
 632         list_for_each(p, &subs->fmt_list) {
 633                 struct audioformat *fp;
 634                 fp = list_entry(p, struct audioformat, list);
 635                 if (!hw_check_valid_format(subs, params, fp))
 636                         continue;
 637                 fbits |= fp->formats;
 638         }
 639
 640         oldbits[0] = fmt->bits[0];
 641         oldbits[1] = fmt->bits[1];
 642         fmt->bits[0] &= (u32)fbits;
 643         fmt->bits[1] &= (u32)(fbits >> 32);
 644         if (!fmt->bits[0] && !fmt->bits[1]) {
 645                 hwc_debug("  --> get empty\n");
 646                 return -EINVAL;
 647         }
 648         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
 649         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
 650         return changed;
 651 }
 652
 653 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 654                                struct snd_pcm_hw_rule *rule)
 655 {
 656         struct snd_usb_substream *subs = rule->private;
 657         struct audioformat *fp;
 658         struct snd_interval *it;
 659         unsigned char min_datainterval;
 660         unsigned int pmin;
 661         int changed;
 662
 663         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 664         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
 665         min_datainterval = 0xff;
 666         list_for_each_entry(fp, &subs->fmt_list, list) {
 667                 if (!hw_check_valid_format(subs, params, fp))
 668                         continue;
 669                 min_datainterval = min(min_datainterval, fp->datainterval);
 670         }
 671         if (min_datainterval == 0xff) {
 672                 hwc_debug("  --> get empty\n");
 673                 it->empty = 1;
 674                 return -EINVAL;
 675         }
 676         pmin = 125 * (1 << min_datainterval);
 677         changed = 0;
 678         if (it->min < pmin) {
 679                 it->min = pmin;
 680                 it->openmin = 0;
 681                 changed = 1;
 682         }
 683         if (snd_interval_checkempty(it)) {
 684                 it->empty = 1;
 685                 return -EINVAL;
 686         }
 687         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
 688         return changed;
 689 }
 690
 691 /*
 692  *  If the device supports unusual bit rates, does the request meet these?
 693  */
 694 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 695                                   struct snd_usb_substream *subs)
 696 {
 697         struct audioformat *fp;
 698         int *rate_list;
 699         int count = 0, needs_knot = 0;
 700         int err;
 701
 702         kfree(subs->rate_list.list);
 703         subs->rate_list.list = NULL;
 704
 705         list_for_each_entry(fp, &subs->fmt_list, list) {
 706                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 707                         return 0;
 708                 count += fp->nr_rates;
 709                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
 710                         needs_knot = 1;
 711         }
 712         if (!needs_knot)
 713                 return 0;
 714
 715         subs->rate_list.list = rate_list =
 716                 kmalloc(sizeof(int) * count, GFP_KERNEL);
 717         if (!subs->rate_list.list)
 718                 return -ENOMEM;
 719         subs->rate_list.count = count;
 720         subs->rate_list.mask = 0;
 721         count = 0;
 722         list_for_each_entry(fp, &subs->fmt_list, list) {
 723                 int i;
 724                 for (i = 0; i < fp->nr_rates; i++)
 725                         rate_list[count++] = fp->rate_table[i];
 726         }
 727         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 728                                          &subs->rate_list);
 729         if (err < 0)
 730                 return err;
 731
 732         return 0;
 733 }
 734
 735
 736 /*
 737  * set up the runtime hardware information.
 738  */
 739
 740 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 741 {
 742         struct list_head *p;
 743         unsigned int pt, ptmin;
 744         int param_period_time_if_needed;
 745         int err;
 746
 747         runtime->hw.formats = subs->formats;
 748
 749         runtime->hw.rate_min = 0x7fffffff;
 750         runtime->hw.rate_max = 0;
 751         runtime->hw.channels_min = 256;
 752         runtime->hw.channels_max = 0;
 753         runtime->hw.rates = 0;
 754         ptmin = UINT_MAX;
 755         /* check min/max rates and channels */
 756         list_for_each(p, &subs->fmt_list) {
 757                 struct audioformat *fp;
 758                 fp = list_entry(p, struct audioformat, list);
 759                 runtime->hw.rates |= fp->rates;
 760                 if (runtime->hw.rate_min > fp->rate_min)
 761                         runtime->hw.rate_min = fp->rate_min;
 762                 if (runtime->hw.rate_max < fp->rate_max)
 763                         runtime->hw.rate_max = fp->rate_max;
 764                 if (runtime->hw.channels_min > fp->channels)
 765                         runtime->hw.channels_min = fp->channels;
 766                 if (runtime->hw.channels_max < fp->channels)
 767                         runtime->hw.channels_max = fp->channels;
 768                 if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
 769                         /* FIXME: there might be more than one audio formats... */
 770                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
 771                                 fp->frame_size;
 772                 }
 773                 pt = 125 * (1 << fp->datainterval);
 774                 ptmin = min(ptmin, pt);
 775         }
 776         err = snd_usb_autoresume(subs->stream->chip);
 777         if (err < 0)
 778                 return err;
 779
 780         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
 781         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
 782                 /* full speed devices have fixed data packet interval */
 783                 ptmin = 1000;
 784         if (ptmin == 1000)
 785                 /* if period time doesn't go below 1 ms, no rules needed */
 786                 param_period_time_if_needed = -1;
 787         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 788                                      ptmin, UINT_MAX);
 789
 790         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 791                                        hw_rule_rate, subs,
 792                                        SNDRV_PCM_HW_PARAM_FORMAT,
 793                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 794                                        param_period_time_if_needed,
 795                                        -1)) < 0)
 796                 goto rep_err;
 797         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 798                                        hw_rule_channels, subs,
 799                                        SNDRV_PCM_HW_PARAM_FORMAT,
 800                                        SNDRV_PCM_HW_PARAM_RATE,
 801                                        param_period_time_if_needed,
 802                                        -1)) < 0)
 803                 goto rep_err;
 804         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
 805                                        hw_rule_format, subs,
 806                                        SNDRV_PCM_HW_PARAM_RATE,
 807                                        SNDRV_PCM_HW_PARAM_CHANNELS,
 808                                        param_period_time_if_needed,
 809                                        -1)) < 0)
 810                 goto rep_err;
 811         if (param_period_time_if_needed >= 0) {
 812                 err = snd_pcm_hw_rule_add(runtime, 0,
 813                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 814                                           hw_rule_period_time, subs,
 815                                           SNDRV_PCM_HW_PARAM_FORMAT,
 816                                           SNDRV_PCM_HW_PARAM_CHANNELS,
 817                                           SNDRV_PCM_HW_PARAM_RATE,
 818                                           -1);
 819                 if (err < 0)
 820                         goto rep_err;
 821         }
 822         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
 823                 goto rep_err;
 824         return 0;
 825
 826 rep_err:
 827         snd_usb_autosuspend(subs->stream->chip);
 828         return err;
 829 }
 830
 831 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
 832 {
 833         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 834         struct snd_pcm_runtime *runtime = substream->runtime;
 835         struct snd_usb_substream *subs = &as->substream[direction];
 836
 837         subs->interface = -1;
 838         subs->altset_idx = 0;
 839         runtime->hw = snd_usb_hardware;
 840         runtime->private_data = subs;
 841         subs->pcm_substream = substream;
 842         /* runtime PM is also done there */
 843         return setup_hw_info(runtime, subs);
 844 }
 845
 846 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
 847 {
 848         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
 849         struct snd_usb_substream *subs = &as->substream[direction];
 850
 851         if (!as->chip->shutdown && subs->interface >= 0) {
 852                 usb_set_interface(subs->dev, subs->interface, 0);
 853                 subs->interface = -1;
 854         }
 855         subs->pcm_substream = NULL;
 856         snd_usb_autosuspend(subs->stream->chip);
 857         return 0;
 858 }
 859
 860 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
 861 {
 862         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
 863 }
 864
 865 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
 866 {
 867         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
 868 }
 869
 870 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
 871 {
 872         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
 873 }
 874
 875 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
 876 {
 877         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
 878 }
 879
 880 static struct snd_pcm_ops snd_usb_playback_ops = {
 881         .open =         snd_usb_playback_open,
 882         .close =        snd_usb_playback_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_playback_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 static struct snd_pcm_ops snd_usb_capture_ops = {
 894         .open =         snd_usb_capture_open,
 895         .close =        snd_usb_capture_close,
 896         .ioctl =        snd_pcm_lib_ioctl,
 897         .hw_params =    snd_usb_hw_params,
 898         .hw_free =      snd_usb_hw_free,
 899         .prepare =      snd_usb_pcm_prepare,
 900         .trigger =      snd_usb_substream_capture_trigger,
 901         .pointer =      snd_usb_pcm_pointer,
 902         .page =         snd_pcm_lib_get_vmalloc_page,
 903         .mmap =         snd_pcm_lib_mmap_vmalloc,
 904 };
 905
 906 void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
 907 {
 908         snd_pcm_set_ops(pcm, stream,
 909                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
 910                         &snd_usb_playback_ops : &snd_usb_capture_ops);
 911 }