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