Daniel Mack | e577999 | 2010-03-04 19:46:13 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (Tentative) USB Audio Driver for ALSA |
| 3 | * |
| 4 | * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de> |
| 5 | * |
| 6 | * Many codes borrowed from audio.c by |
| 7 | * Alan Cox (alan@lxorguk.ukuu.org.uk) |
| 8 | * Thomas Sailer (sailer@ife.ee.ethz.ch) |
| 9 | * |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | * |
| 25 | * |
| 26 | * NOTES: |
| 27 | * |
| 28 | * - async unlink should be used for avoiding the sleep inside lock. |
| 29 | * 2.4.22 usb-uhci seems buggy for async unlinking and results in |
| 30 | * oops. in such a cse, pass async_unlink=0 option. |
| 31 | * - the linked URBs would be preferred but not used so far because of |
| 32 | * the instability of unlinking. |
| 33 | * - type II is not supported properly. there is no device which supports |
| 34 | * this type *correctly*. SB extigy looks as if it supports, but it's |
| 35 | * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). |
| 36 | */ |
| 37 | |
| 38 | |
| 39 | #include <linux/bitops.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/list.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <linux/string.h> |
| 44 | #include <linux/usb.h> |
| 45 | #include <linux/moduleparam.h> |
| 46 | #include <linux/mutex.h> |
| 47 | #include <linux/usb/audio.h> |
| 48 | |
| 49 | #include <sound/core.h> |
| 50 | #include <sound/info.h> |
| 51 | #include <sound/pcm.h> |
| 52 | #include <sound/pcm_params.h> |
| 53 | #include <sound/initval.h> |
| 54 | |
| 55 | #include "usbaudio.h" |
| 56 | #include "card.h" |
| 57 | #include "midi.h" |
| 58 | #include "usbmixer.h" |
| 59 | #include "proc.h" |
| 60 | #include "quirks.h" |
| 61 | #include "endpoint.h" |
| 62 | #include "helper.h" |
| 63 | #include "debug.h" |
| 64 | #include "pcm.h" |
| 65 | #include "urb.h" |
| 66 | #include "format.h" |
| 67 | |
| 68 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
| 69 | MODULE_DESCRIPTION("USB Audio"); |
| 70 | MODULE_LICENSE("GPL"); |
| 71 | MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); |
| 72 | |
| 73 | |
| 74 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ |
| 75 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
| 76 | static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ |
| 77 | /* Vendor/product IDs for this card */ |
| 78 | static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; |
| 79 | static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; |
| 80 | static int nrpacks = 8; /* max. number of packets per urb */ |
| 81 | static int async_unlink = 1; |
| 82 | static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ |
| 83 | static int ignore_ctl_error; |
| 84 | |
| 85 | module_param_array(index, int, NULL, 0444); |
| 86 | MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); |
| 87 | module_param_array(id, charp, NULL, 0444); |
| 88 | MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); |
| 89 | module_param_array(enable, bool, NULL, 0444); |
| 90 | MODULE_PARM_DESC(enable, "Enable USB audio adapter."); |
| 91 | module_param_array(vid, int, NULL, 0444); |
| 92 | MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); |
| 93 | module_param_array(pid, int, NULL, 0444); |
| 94 | MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); |
| 95 | module_param(nrpacks, int, 0644); |
| 96 | MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB."); |
| 97 | module_param(async_unlink, bool, 0444); |
| 98 | MODULE_PARM_DESC(async_unlink, "Use async unlink mode."); |
| 99 | module_param_array(device_setup, int, NULL, 0444); |
| 100 | MODULE_PARM_DESC(device_setup, "Specific device setup (if needed)."); |
| 101 | module_param(ignore_ctl_error, bool, 0444); |
| 102 | MODULE_PARM_DESC(ignore_ctl_error, |
| 103 | "Ignore errors from USB controller for mixer interfaces."); |
| 104 | |
| 105 | /* |
| 106 | * we keep the snd_usb_audio_t instances by ourselves for merging |
| 107 | * the all interfaces on the same card as one sound device. |
| 108 | */ |
| 109 | |
| 110 | static DEFINE_MUTEX(register_mutex); |
| 111 | static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; |
| 112 | static struct usb_driver usb_audio_driver; |
| 113 | |
| 114 | /* |
| 115 | * disconnect streams |
| 116 | * called from snd_usb_audio_disconnect() |
| 117 | */ |
| 118 | static void snd_usb_stream_disconnect(struct list_head *head) |
| 119 | { |
| 120 | int idx; |
| 121 | struct snd_usb_stream *as; |
| 122 | struct snd_usb_substream *subs; |
| 123 | |
| 124 | as = list_entry(head, struct snd_usb_stream, list); |
| 125 | for (idx = 0; idx < 2; idx++) { |
| 126 | subs = &as->substream[idx]; |
| 127 | if (!subs->num_formats) |
| 128 | return; |
| 129 | snd_usb_release_substream_urbs(subs, 1); |
| 130 | subs->interface = -1; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) |
| 135 | { |
| 136 | struct usb_device *dev = chip->dev; |
| 137 | struct usb_host_interface *alts; |
| 138 | struct usb_interface_descriptor *altsd; |
| 139 | struct usb_interface *iface = usb_ifnum_to_if(dev, interface); |
| 140 | |
| 141 | if (!iface) { |
| 142 | snd_printk(KERN_ERR "%d:%u:%d : does not exist\n", |
| 143 | dev->devnum, ctrlif, interface); |
| 144 | return -EINVAL; |
| 145 | } |
| 146 | |
| 147 | if (usb_interface_claimed(iface)) { |
| 148 | snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", |
| 149 | dev->devnum, ctrlif, interface); |
| 150 | return -EINVAL; |
| 151 | } |
| 152 | |
| 153 | alts = &iface->altsetting[0]; |
| 154 | altsd = get_iface_desc(alts); |
| 155 | if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || |
| 156 | altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && |
| 157 | altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { |
| 158 | int err = snd_usbmidi_create(chip->card, iface, |
| 159 | &chip->midi_list, NULL); |
| 160 | if (err < 0) { |
| 161 | snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", |
| 162 | dev->devnum, ctrlif, interface); |
| 163 | return -EINVAL; |
| 164 | } |
| 165 | usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); |
| 166 | |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && |
| 171 | altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || |
| 172 | altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { |
| 173 | snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", |
| 174 | dev->devnum, ctrlif, interface, altsd->bInterfaceClass); |
| 175 | /* skip non-supported classes */ |
| 176 | return -EINVAL; |
| 177 | } |
| 178 | |
| 179 | if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { |
| 180 | snd_printk(KERN_ERR "low speed audio streaming not supported\n"); |
| 181 | return -EINVAL; |
| 182 | } |
| 183 | |
| 184 | if (! snd_usb_parse_audio_endpoints(chip, interface)) { |
| 185 | usb_set_interface(dev, interface, 0); /* reset the current interface */ |
| 186 | usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); |
| 187 | return -EINVAL; |
| 188 | } |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * parse audio control descriptor and create pcm/midi streams |
| 195 | */ |
| 196 | static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) |
| 197 | { |
| 198 | struct usb_device *dev = chip->dev; |
| 199 | struct usb_host_interface *host_iface; |
| 200 | struct usb_interface_descriptor *altsd; |
| 201 | void *control_header; |
| 202 | int i, protocol; |
| 203 | |
| 204 | /* find audiocontrol interface */ |
| 205 | host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; |
| 206 | control_header = snd_usb_find_csint_desc(host_iface->extra, |
| 207 | host_iface->extralen, |
| 208 | NULL, UAC_HEADER); |
| 209 | altsd = get_iface_desc(host_iface); |
| 210 | protocol = altsd->bInterfaceProtocol; |
| 211 | |
| 212 | if (!control_header) { |
| 213 | snd_printk(KERN_ERR "cannot find UAC_HEADER\n"); |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | |
| 217 | switch (protocol) { |
| 218 | case UAC_VERSION_1: { |
| 219 | struct uac_ac_header_descriptor_v1 *h1 = control_header; |
| 220 | |
| 221 | if (!h1->bInCollection) { |
| 222 | snd_printk(KERN_INFO "skipping empty audio interface (v1)\n"); |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | if (h1->bLength < sizeof(*h1) + h1->bInCollection) { |
| 227 | snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n"); |
| 228 | return -EINVAL; |
| 229 | } |
| 230 | |
| 231 | for (i = 0; i < h1->bInCollection; i++) |
| 232 | snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); |
| 233 | |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | case UAC_VERSION_2: { |
| 238 | struct uac_clock_source_descriptor *cs; |
| 239 | struct usb_interface_assoc_descriptor *assoc = |
| 240 | usb_ifnum_to_if(dev, ctrlif)->intf_assoc; |
| 241 | |
| 242 | if (!assoc) { |
| 243 | snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n"); |
| 244 | return -EINVAL; |
| 245 | } |
| 246 | |
| 247 | /* FIXME: for now, we expect there is at least one clock source |
| 248 | * descriptor and we always take the first one. |
| 249 | * We should properly support devices with multiple clock sources, |
| 250 | * clock selectors and sample rate conversion units. */ |
| 251 | |
| 252 | cs = snd_usb_find_csint_desc(host_iface->extra, host_iface->extralen, |
| 253 | NULL, UAC_CLOCK_SOURCE); |
| 254 | |
| 255 | if (!cs) { |
| 256 | snd_printk(KERN_ERR "CLOCK_SOURCE descriptor not found\n"); |
| 257 | return -EINVAL; |
| 258 | } |
| 259 | |
| 260 | chip->clock_id = cs->bClockID; |
| 261 | |
| 262 | for (i = 0; i < assoc->bInterfaceCount; i++) { |
| 263 | int intf = assoc->bFirstInterface + i; |
| 264 | |
| 265 | if (intf != ctrlif) |
| 266 | snd_usb_create_stream(chip, ctrlif, intf); |
| 267 | } |
| 268 | |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | default: |
| 273 | snd_printk(KERN_ERR "unknown protocol version 0x%02x\n", protocol); |
| 274 | return -EINVAL; |
| 275 | } |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * free the chip instance |
| 282 | * |
| 283 | * here we have to do not much, since pcm and controls are already freed |
| 284 | * |
| 285 | */ |
| 286 | |
| 287 | static int snd_usb_audio_free(struct snd_usb_audio *chip) |
| 288 | { |
| 289 | kfree(chip); |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int snd_usb_audio_dev_free(struct snd_device *device) |
| 294 | { |
| 295 | struct snd_usb_audio *chip = device->device_data; |
| 296 | return snd_usb_audio_free(chip); |
| 297 | } |
| 298 | |
| 299 | |
| 300 | /* |
| 301 | * create a chip instance and set its names. |
| 302 | */ |
| 303 | static int snd_usb_audio_create(struct usb_device *dev, int idx, |
| 304 | const struct snd_usb_audio_quirk *quirk, |
| 305 | struct snd_usb_audio **rchip) |
| 306 | { |
| 307 | struct snd_card *card; |
| 308 | struct snd_usb_audio *chip; |
| 309 | int err, len; |
| 310 | char component[14]; |
| 311 | static struct snd_device_ops ops = { |
| 312 | .dev_free = snd_usb_audio_dev_free, |
| 313 | }; |
| 314 | |
| 315 | *rchip = NULL; |
| 316 | |
| 317 | if (snd_usb_get_speed(dev) != USB_SPEED_LOW && |
| 318 | snd_usb_get_speed(dev) != USB_SPEED_FULL && |
| 319 | snd_usb_get_speed(dev) != USB_SPEED_HIGH) { |
| 320 | snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev)); |
| 321 | return -ENXIO; |
| 322 | } |
| 323 | |
| 324 | err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card); |
| 325 | if (err < 0) { |
| 326 | snd_printk(KERN_ERR "cannot create card instance %d\n", idx); |
| 327 | return err; |
| 328 | } |
| 329 | |
| 330 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 331 | if (! chip) { |
| 332 | snd_card_free(card); |
| 333 | return -ENOMEM; |
| 334 | } |
| 335 | |
| 336 | chip->index = idx; |
| 337 | chip->dev = dev; |
| 338 | chip->card = card; |
| 339 | chip->setup = device_setup[idx]; |
| 340 | chip->nrpacks = nrpacks; |
| 341 | chip->async_unlink = async_unlink; |
| 342 | |
| 343 | chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), |
| 344 | le16_to_cpu(dev->descriptor.idProduct)); |
| 345 | INIT_LIST_HEAD(&chip->pcm_list); |
| 346 | INIT_LIST_HEAD(&chip->midi_list); |
| 347 | INIT_LIST_HEAD(&chip->mixer_list); |
| 348 | |
| 349 | if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { |
| 350 | snd_usb_audio_free(chip); |
| 351 | snd_card_free(card); |
| 352 | return err; |
| 353 | } |
| 354 | |
| 355 | strcpy(card->driver, "USB-Audio"); |
| 356 | sprintf(component, "USB%04x:%04x", |
| 357 | USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); |
| 358 | snd_component_add(card, component); |
| 359 | |
| 360 | /* retrieve the device string as shortname */ |
| 361 | if (quirk && quirk->product_name) { |
| 362 | strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); |
| 363 | } else { |
| 364 | if (!dev->descriptor.iProduct || |
| 365 | usb_string(dev, dev->descriptor.iProduct, |
| 366 | card->shortname, sizeof(card->shortname)) <= 0) { |
| 367 | /* no name available from anywhere, so use ID */ |
| 368 | sprintf(card->shortname, "USB Device %#04x:%#04x", |
| 369 | USB_ID_VENDOR(chip->usb_id), |
| 370 | USB_ID_PRODUCT(chip->usb_id)); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | /* retrieve the vendor and device strings as longname */ |
| 375 | if (quirk && quirk->vendor_name) { |
| 376 | len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); |
| 377 | } else { |
| 378 | if (dev->descriptor.iManufacturer) |
| 379 | len = usb_string(dev, dev->descriptor.iManufacturer, |
| 380 | card->longname, sizeof(card->longname)); |
| 381 | else |
| 382 | len = 0; |
| 383 | /* we don't really care if there isn't any vendor string */ |
| 384 | } |
| 385 | if (len > 0) |
| 386 | strlcat(card->longname, " ", sizeof(card->longname)); |
| 387 | |
| 388 | strlcat(card->longname, card->shortname, sizeof(card->longname)); |
| 389 | |
| 390 | len = strlcat(card->longname, " at ", sizeof(card->longname)); |
| 391 | |
| 392 | if (len < sizeof(card->longname)) |
| 393 | usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); |
| 394 | |
| 395 | strlcat(card->longname, |
| 396 | snd_usb_get_speed(dev) == USB_SPEED_LOW ? ", low speed" : |
| 397 | snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" : |
| 398 | ", high speed", |
| 399 | sizeof(card->longname)); |
| 400 | |
| 401 | snd_usb_audio_create_proc(chip); |
| 402 | |
| 403 | *rchip = chip; |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * probe the active usb device |
| 409 | * |
| 410 | * note that this can be called multiple times per a device, when it |
| 411 | * includes multiple audio control interfaces. |
| 412 | * |
| 413 | * thus we check the usb device pointer and creates the card instance |
| 414 | * only at the first time. the successive calls of this function will |
| 415 | * append the pcm interface to the corresponding card. |
| 416 | */ |
| 417 | static void *snd_usb_audio_probe(struct usb_device *dev, |
| 418 | struct usb_interface *intf, |
| 419 | const struct usb_device_id *usb_id) |
| 420 | { |
| 421 | const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info; |
| 422 | int i, err; |
| 423 | struct snd_usb_audio *chip; |
| 424 | struct usb_host_interface *alts; |
| 425 | int ifnum; |
| 426 | u32 id; |
| 427 | |
| 428 | alts = &intf->altsetting[0]; |
| 429 | ifnum = get_iface_desc(alts)->bInterfaceNumber; |
| 430 | id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), |
| 431 | le16_to_cpu(dev->descriptor.idProduct)); |
| 432 | if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) |
| 433 | goto __err_val; |
| 434 | |
| 435 | if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0) |
| 436 | goto __err_val; |
| 437 | |
| 438 | /* |
| 439 | * found a config. now register to ALSA |
| 440 | */ |
| 441 | |
| 442 | /* check whether it's already registered */ |
| 443 | chip = NULL; |
| 444 | mutex_lock(®ister_mutex); |
| 445 | for (i = 0; i < SNDRV_CARDS; i++) { |
| 446 | if (usb_chip[i] && usb_chip[i]->dev == dev) { |
| 447 | if (usb_chip[i]->shutdown) { |
| 448 | snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n"); |
| 449 | goto __error; |
| 450 | } |
| 451 | chip = usb_chip[i]; |
| 452 | break; |
| 453 | } |
| 454 | } |
| 455 | if (! chip) { |
| 456 | /* it's a fresh one. |
| 457 | * now look for an empty slot and create a new card instance |
| 458 | */ |
| 459 | for (i = 0; i < SNDRV_CARDS; i++) |
| 460 | if (enable[i] && ! usb_chip[i] && |
| 461 | (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && |
| 462 | (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { |
| 463 | if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) { |
| 464 | goto __error; |
| 465 | } |
| 466 | snd_card_set_dev(chip->card, &intf->dev); |
| 467 | break; |
| 468 | } |
| 469 | if (!chip) { |
| 470 | printk(KERN_ERR "no available usb audio device\n"); |
| 471 | goto __error; |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | chip->txfr_quirk = 0; |
| 476 | err = 1; /* continue */ |
| 477 | if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { |
| 478 | /* need some special handlings */ |
| 479 | if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) |
| 480 | goto __error; |
| 481 | } |
| 482 | |
| 483 | if (err > 0) { |
| 484 | /* create normal USB audio interfaces */ |
| 485 | if (snd_usb_create_streams(chip, ifnum) < 0 || |
| 486 | snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) { |
| 487 | goto __error; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | /* we are allowed to call snd_card_register() many times */ |
| 492 | if (snd_card_register(chip->card) < 0) { |
| 493 | goto __error; |
| 494 | } |
| 495 | |
| 496 | usb_chip[chip->index] = chip; |
| 497 | chip->num_interfaces++; |
| 498 | mutex_unlock(®ister_mutex); |
| 499 | return chip; |
| 500 | |
| 501 | __error: |
| 502 | if (chip && !chip->num_interfaces) |
| 503 | snd_card_free(chip->card); |
| 504 | mutex_unlock(®ister_mutex); |
| 505 | __err_val: |
| 506 | return NULL; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * we need to take care of counter, since disconnection can be called also |
| 511 | * many times as well as usb_audio_probe(). |
| 512 | */ |
| 513 | static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr) |
| 514 | { |
| 515 | struct snd_usb_audio *chip; |
| 516 | struct snd_card *card; |
| 517 | struct list_head *p; |
| 518 | |
| 519 | if (ptr == (void *)-1L) |
| 520 | return; |
| 521 | |
| 522 | chip = ptr; |
| 523 | card = chip->card; |
| 524 | mutex_lock(®ister_mutex); |
| 525 | chip->shutdown = 1; |
| 526 | chip->num_interfaces--; |
| 527 | if (chip->num_interfaces <= 0) { |
| 528 | snd_card_disconnect(card); |
| 529 | /* release the pcm resources */ |
| 530 | list_for_each(p, &chip->pcm_list) { |
| 531 | snd_usb_stream_disconnect(p); |
| 532 | } |
| 533 | /* release the midi resources */ |
| 534 | list_for_each(p, &chip->midi_list) { |
| 535 | snd_usbmidi_disconnect(p); |
| 536 | } |
| 537 | /* release mixer resources */ |
| 538 | list_for_each(p, &chip->mixer_list) { |
| 539 | snd_usb_mixer_disconnect(p); |
| 540 | } |
| 541 | usb_chip[chip->index] = NULL; |
| 542 | mutex_unlock(®ister_mutex); |
| 543 | snd_card_free_when_closed(card); |
| 544 | } else { |
| 545 | mutex_unlock(®ister_mutex); |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * new 2.5 USB kernel API |
| 551 | */ |
| 552 | static int usb_audio_probe(struct usb_interface *intf, |
| 553 | const struct usb_device_id *id) |
| 554 | { |
| 555 | void *chip; |
| 556 | chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); |
| 557 | if (chip) { |
| 558 | usb_set_intfdata(intf, chip); |
| 559 | return 0; |
| 560 | } else |
| 561 | return -EIO; |
| 562 | } |
| 563 | |
| 564 | static void usb_audio_disconnect(struct usb_interface *intf) |
| 565 | { |
| 566 | snd_usb_audio_disconnect(interface_to_usbdev(intf), |
| 567 | usb_get_intfdata(intf)); |
| 568 | } |
| 569 | |
| 570 | #ifdef CONFIG_PM |
| 571 | static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) |
| 572 | { |
| 573 | struct snd_usb_audio *chip = usb_get_intfdata(intf); |
| 574 | struct list_head *p; |
| 575 | struct snd_usb_stream *as; |
| 576 | |
| 577 | if (chip == (void *)-1L) |
| 578 | return 0; |
| 579 | |
| 580 | snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); |
| 581 | if (!chip->num_suspended_intf++) { |
| 582 | list_for_each(p, &chip->pcm_list) { |
| 583 | as = list_entry(p, struct snd_usb_stream, list); |
| 584 | snd_pcm_suspend_all(as->pcm); |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | static int usb_audio_resume(struct usb_interface *intf) |
| 592 | { |
| 593 | struct snd_usb_audio *chip = usb_get_intfdata(intf); |
| 594 | |
| 595 | if (chip == (void *)-1L) |
| 596 | return 0; |
| 597 | if (--chip->num_suspended_intf) |
| 598 | return 0; |
| 599 | /* |
| 600 | * ALSA leaves material resumption to user space |
| 601 | * we just notify |
| 602 | */ |
| 603 | |
| 604 | snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); |
| 605 | |
| 606 | return 0; |
| 607 | } |
| 608 | #endif /* CONFIG_PM */ |
| 609 | |
| 610 | static struct usb_device_id usb_audio_ids [] = { |
| 611 | #include "quirks-table.h" |
| 612 | { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), |
| 613 | .bInterfaceClass = USB_CLASS_AUDIO, |
| 614 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, |
| 615 | { } /* Terminating entry */ |
| 616 | }; |
| 617 | |
| 618 | MODULE_DEVICE_TABLE (usb, usb_audio_ids); |
| 619 | |
| 620 | /* |
| 621 | * entry point for linux usb interface |
| 622 | */ |
| 623 | |
| 624 | static struct usb_driver usb_audio_driver = { |
| 625 | .name = "snd-usb-audio", |
| 626 | .probe = usb_audio_probe, |
| 627 | .disconnect = usb_audio_disconnect, |
| 628 | .suspend = usb_audio_suspend, |
| 629 | .resume = usb_audio_resume, |
| 630 | .id_table = usb_audio_ids, |
| 631 | }; |
| 632 | |
| 633 | static int __init snd_usb_audio_init(void) |
| 634 | { |
| 635 | if (nrpacks < 1 || nrpacks > MAX_PACKS) { |
| 636 | printk(KERN_WARNING "invalid nrpacks value.\n"); |
| 637 | return -EINVAL; |
| 638 | } |
| 639 | return usb_register(&usb_audio_driver); |
| 640 | } |
| 641 | |
| 642 | static void __exit snd_usb_audio_cleanup(void) |
| 643 | { |
| 644 | usb_deregister(&usb_audio_driver); |
| 645 | } |
| 646 | |
| 647 | module_init(snd_usb_audio_init); |
| 648 | module_exit(snd_usb_audio_cleanup); |