sound/usb/stream.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
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "proc.h"
  30 #include "quirks.h"
  31 #include "endpoint.h"
  32 #include "pcm.h"
  33 #include "helper.h"
  34 #include "format.h"
  35 #include "clock.h"
  36 #include "stream.h"
  37
  38 /*
  39  * free a substream
  40  */
  41 static void free_substream(struct snd_usb_substream *subs)
  42 {
  43         struct list_head *p, *n;
  44
  45         if (!subs->num_formats)
  46                 return; /* not initialized */
  47         list_for_each_safe(p, n, &subs->fmt_list) {
  48                 struct audioformat *fp = list_entry(p, struct audioformat, list);
  49                 kfree(fp->rate_table);
  50                 kfree(fp);
  51         }
  52         kfree(subs->rate_list.list);
  53 }
  54
  55
  56 /*
  57  * free a usb stream instance
  58  */
  59 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
  60 {
  61         free_substream(&stream->substream[0]);
  62         free_substream(&stream->substream[1]);
  63         list_del(&stream->list);
  64         kfree(stream);
  65 }
  66
  67 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
  68 {
  69         struct snd_usb_stream *stream = pcm->private_data;
  70         if (stream) {
  71                 stream->pcm = NULL;
  72                 snd_usb_audio_stream_free(stream);
  73         }
  74 }
  75
  76 /*
  77  * initialize the substream instance.
  78  */
  79
  80 static void snd_usb_init_substream(struct snd_usb_stream *as,
  81                                    int stream,
  82                                    struct audioformat *fp)
  83 {
  84         struct snd_usb_substream *subs = &as->substream[stream];
  85
  86         INIT_LIST_HEAD(&subs->fmt_list);
  87         spin_lock_init(&subs->lock);
  88
  89         subs->stream = as;
  90         subs->direction = stream;
  91         subs->dev = as->chip->dev;
  92         subs->txfr_quirk = as->chip->txfr_quirk;
  93         subs->speed = snd_usb_get_speed(subs->dev);
  94
  95         snd_usb_set_pcm_ops(as->pcm, stream);
  96
  97         list_add_tail(&fp->list, &subs->fmt_list);
  98         subs->formats |= fp->formats;
  99         subs->num_formats++;
 100         subs->fmt_type = fp->fmt_type;
 101         subs->ep_num = fp->endpoint;
 102 }
 103
 104 /*
 105  * add this endpoint to the chip instance.
 106  * if a stream with the same endpoint already exists, append to it.
 107  * if not, create a new pcm stream.
 108  */
 109 int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
 110                              int stream,
 111                              struct audioformat *fp)
 112 {
 113         struct list_head *p;
 114         struct snd_usb_stream *as;
 115         struct snd_usb_substream *subs;
 116         struct snd_pcm *pcm;
 117         int err;
 118
 119         list_for_each(p, &chip->pcm_list) {
 120                 as = list_entry(p, struct snd_usb_stream, list);
 121                 if (as->fmt_type != fp->fmt_type)
 122                         continue;
 123                 subs = &as->substream[stream];
 124                 if (subs->ep_num == fp->endpoint) {
 125                         list_add_tail(&fp->list, &subs->fmt_list);
 126                         subs->num_formats++;
 127                         subs->formats |= fp->formats;
 128                         return 0;
 129                 }
 130         }
 131         /* look for an empty stream */
 132         list_for_each(p, &chip->pcm_list) {
 133                 as = list_entry(p, struct snd_usb_stream, list);
 134                 if (as->fmt_type != fp->fmt_type)
 135                         continue;
 136                 subs = &as->substream[stream];
 137                 if (subs->ep_num)
 138                         continue;
 139                 err = snd_pcm_new_stream(as->pcm, stream, 1);
 140                 if (err < 0)
 141                         return err;
 142                 snd_usb_init_substream(as, stream, fp);
 143                 return 0;
 144         }
 145
 146         /* create a new pcm */
 147         as = kzalloc(sizeof(*as), GFP_KERNEL);
 148         if (!as)
 149                 return -ENOMEM;
 150         as->pcm_index = chip->pcm_devs;
 151         as->chip = chip;
 152         as->fmt_type = fp->fmt_type;
 153         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
 154                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
 155                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
 156                           &pcm);
 157         if (err < 0) {
 158                 kfree(as);
 159                 return err;
 160         }
 161         as->pcm = pcm;
 162         pcm->private_data = as;
 163         pcm->private_free = snd_usb_audio_pcm_free;
 164         pcm->info_flags = 0;
 165         if (chip->pcm_devs > 0)
 166                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
 167         else
 168                 strcpy(pcm->name, "USB Audio");
 169
 170         snd_usb_init_substream(as, stream, fp);
 171
 172         list_add(&as->list, &chip->pcm_list);
 173         chip->pcm_devs++;
 174
 175         snd_usb_proc_pcm_format_add(as);
 176
 177         return 0;
 178 }
 179
 180 static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
 181                                          struct usb_host_interface *alts,
 182                                          int protocol, int iface_no)
 183 {
 184         /* parsed with a v1 header here. that's ok as we only look at the
 185          * header first which is the same for both versions */
 186         struct uac_iso_endpoint_descriptor *csep;
 187         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 188         int attributes = 0;
 189
 190         csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
 191
 192         /* Creamware Noah has this descriptor after the 2nd endpoint */
 193         if (!csep && altsd->bNumEndpoints >= 2)
 194                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 195
 196         if (!csep || csep->bLength < 7 ||
 197             csep->bDescriptorSubtype != UAC_EP_GENERAL) {
 198                 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
 199                            " class specific endpoint descriptor\n",
 200                            chip->dev->devnum, iface_no,
 201                            altsd->bAlternateSetting);
 202                 return 0;
 203         }
 204
 205         if (protocol == UAC_VERSION_1) {
 206                 attributes = csep->bmAttributes;
 207         } else {
 208                 struct uac2_iso_endpoint_descriptor *csep2 =
 209                         (struct uac2_iso_endpoint_descriptor *) csep;
 210
 211                 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
 212
 213                 /* emulate the endpoint attributes of a v1 device */
 214                 if (csep2->bmControls & UAC2_CONTROL_PITCH)
 215                         attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
 216         }
 217
 218         return attributes;
 219 }
 220
 221 static struct uac2_input_terminal_descriptor *
 222         snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 223                                                int terminal_id)
 224 {
 225         struct uac2_input_terminal_descriptor *term = NULL;
 226
 227         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 228                                                ctrl_iface->extralen,
 229                                                term, UAC_INPUT_TERMINAL))) {
 230                 if (term->bTerminalID == terminal_id)
 231                         return term;
 232         }
 233
 234         return NULL;
 235 }
 236
 237 static struct uac2_output_terminal_descriptor *
 238         snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
 239                                                 int terminal_id)
 240 {
 241         struct uac2_output_terminal_descriptor *term = NULL;
 242
 243         while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
 244                                                ctrl_iface->extralen,
 245                                                term, UAC_OUTPUT_TERMINAL))) {
 246                 if (term->bTerminalID == terminal_id)
 247                         return term;
 248         }
 249
 250         return NULL;
 251 }
 252
 253 int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
 254 {
 255         struct usb_device *dev;
 256         struct usb_interface *iface;
 257         struct usb_host_interface *alts;
 258         struct usb_interface_descriptor *altsd;
 259         int i, altno, err, stream;
 260         int format = 0, num_channels = 0;
 261         struct audioformat *fp = NULL;
 262         int num, protocol, clock = 0;
 263         struct uac_format_type_i_continuous_descriptor *fmt;
 264
 265         dev = chip->dev;
 266
 267         /* parse the interface's altsettings */
 268         iface = usb_ifnum_to_if(dev, iface_no);
 269
 270         num = iface->num_altsetting;
 271
 272         /*
 273          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
 274          * one misses syncpipe, and does not produce any sound.
 275          */
 276         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
 277                 num = 4;
 278
 279         for (i = 0; i < num; i++) {
 280                 alts = &iface->altsetting[i];
 281                 altsd = get_iface_desc(alts);
 282                 protocol = altsd->bInterfaceProtocol;
 283                 /* skip invalid one */
 284                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
 285                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
 286                     (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
 287                      altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
 288                     altsd->bNumEndpoints < 1 ||
 289                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
 290                         continue;
 291                 /* must be isochronous */
 292                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
 293                     USB_ENDPOINT_XFER_ISOC)
 294                         continue;
 295                 /* check direction */
 296                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
 297                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 298                 altno = altsd->bAlternateSetting;
 299
 300                 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
 301                         continue;
 302
 303                 /* get audio formats */
 304                 switch (protocol) {
 305                 default:
 306                         snd_printdd(KERN_WARNING "%d:%u:%d: unknown interface protocol %#02x, assuming v1\n",
 307                                     dev->devnum, iface_no, altno, protocol);
 308                         protocol = UAC_VERSION_1;
 309                         /* fall through */
 310
 311                 case UAC_VERSION_1: {
 312                         struct uac1_as_header_descriptor *as =
 313                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
 314
 315                         if (!as) {
 316                                 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
 317                                            dev->devnum, iface_no, altno);
 318                                 continue;
 319                         }
 320
 321                         if (as->bLength < sizeof(*as)) {
 322                                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
 323                                            dev->devnum, iface_no, altno);
 324                                 continue;
 325                         }
 326
 327                         format = le16_to_cpu(as->wFormatTag); /* remember the format value */
 328                         break;
 329                 }
 330
 331                 case UAC_VERSION_2: {
 332                         struct uac2_input_terminal_descriptor *input_term;
 333                         struct uac2_output_terminal_descriptor *output_term;
 334                         struct uac2_as_header_descriptor *as =
 335                                 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
 336
 337                         if (!as) {
 338                                 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
 339                                            dev->devnum, iface_no, altno);
 340                                 continue;
 341                         }
 342
 343                         if (as->bLength < sizeof(*as)) {
 344                                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
 345                                            dev->devnum, iface_no, altno);
 346                                 continue;
 347                         }
 348
 349                         num_channels = as->bNrChannels;
 350                         format = le32_to_cpu(as->bmFormats);
 351
 352                         /* lookup the terminal associated to this interface
 353                          * to extract the clock */
 354                         input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
 355                                                                             as->bTerminalLink);
 356                         if (input_term) {
 357                                 clock = input_term->bCSourceID;
 358                                 break;
 359                         }
 360
 361                         output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
 362                                                                               as->bTerminalLink);
 363                         if (output_term) {
 364                                 clock = output_term->bCSourceID;
 365                                 break;
 366                         }
 367
 368                         snd_printk(KERN_ERR "%d:%u:%d : bogus bTerminalLink %d\n",
 369                                    dev->devnum, iface_no, altno, as->bTerminalLink);
 370                         continue;
 371                 }
 372                 }
 373
 374                 /* get format type */
 375                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
 376                 if (!fmt) {
 377                         snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
 378                                    dev->devnum, iface_no, altno);
 379                         continue;
 380                 }
 381                 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
 382                     ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
 383                         snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 384                                    dev->devnum, iface_no, altno);
 385                         continue;
 386                 }
 387
 388                 /*
 389                  * Blue Microphones workaround: The last altsetting is identical
 390                  * with the previous one, except for a larger packet size, but
 391                  * is actually a mislabeled two-channel setting; ignore it.
 392                  */
 393                 if (fmt->bNrChannels == 1 &&
 394                     fmt->bSubframeSize == 2 &&
 395                     altno == 2 && num == 3 &&
 396                     fp && fp->altsetting == 1 && fp->channels == 1 &&
 397                     fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
 398                     protocol == UAC_VERSION_1 &&
 399                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
 400                                                         fp->maxpacksize * 2)
 401                         continue;
 402
 403                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
 404                 if (! fp) {
 405                         snd_printk(KERN_ERR "cannot malloc\n");
 406                         return -ENOMEM;
 407                 }
 408
 409                 fp->iface = iface_no;
 410                 fp->altsetting = altno;
 411                 fp->altset_idx = i;
 412                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 413                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 414                 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
 415                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 416                 /* num_channels is only set for v2 interfaces */
 417                 fp->channels = num_channels;
 418                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
 419                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
 420                                         * (fp->maxpacksize & 0x7ff);
 421                 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
 422                 fp->clock = clock;
 423
 424                 /* some quirks for attributes here */
 425
 426                 switch (chip->usb_id) {
 427                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
 428                         /* Optoplay sets the sample rate attribute although
 429                          * it seems not supporting it in fact.
 430                          */
 431                         fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
 432                         break;
 433                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
 434                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 435                         /* doesn't set the sample rate attribute, but supports it */
 436                         fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
 437                         break;
 438                 case USB_ID(0x0763, 0x2001):  /* M-Audio Quattro USB */
 439                 case USB_ID(0x0763, 0x2012):  /* M-Audio Fast Track Pro USB */
 440                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
 441                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
 442                                                 an older model 77d:223) */
 443                 /*
 444                  * plantronics headset and Griffin iMic have set adaptive-in
 445                  * although it's really not...
 446                  */
 447                         fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
 448                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 449                                 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
 450                         else
 451                                 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
 452                         break;
 453                 }
 454
 455                 /* ok, let's parse further... */
 456                 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
 457                         kfree(fp->rate_table);
 458                         kfree(fp);
 459                         fp = NULL;
 460                         continue;
 461                 }
 462
 463                 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
 464                 err = snd_usb_add_audio_stream(chip, stream, fp);
 465                 if (err < 0) {
 466                         kfree(fp->rate_table);
 467                         kfree(fp);
 468                         return err;
 469                 }
 470                 /* try to set the interface... */
 471                 usb_set_interface(chip->dev, iface_no, altno);
 472                 snd_usb_init_pitch(chip, iface_no, alts, fp);
 473                 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
 474         }
 475         return 0;
 476 }
 477