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