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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 | * - the linked URBs would be preferred but not used so far because of |
29 | * the instability of unlinking. |
30 | * - type II is not supported properly. there is no device which supports |
31 | * this type *correctly*. SB extigy looks as if it supports, but it's |
32 | * indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream). |
33 | */ |
34 | |
35 | |
36 | #include <linux/bitops.h> |
37 | #include <linux/init.h> |
38 | #include <linux/list.h> |
39 | #include <linux/slab.h> |
40 | #include <linux/string.h> |
41 | #include <linux/ctype.h> |
42 | #include <linux/usb.h> |
43 | #include <linux/moduleparam.h> |
44 | #include <linux/mutex.h> |
45 | #include <linux/usb/audio.h> |
46 | #include <linux/usb/audio-v2.h> |
47 | #include <linux/module.h> |
48 | |
49 | #include <sound/control.h> |
50 | #include <sound/core.h> |
51 | #include <sound/info.h> |
52 | #include <sound/pcm.h> |
53 | #include <sound/pcm_params.h> |
54 | #include <sound/initval.h> |
55 | |
56 | #include "usbaudio.h" |
57 | #include "card.h" |
58 | #include "midi.h" |
59 | #include "mixer.h" |
60 | #include "proc.h" |
61 | #include "quirks.h" |
62 | #include "endpoint.h" |
63 | #include "helper.h" |
64 | #include "debug.h" |
65 | #include "pcm.h" |
66 | #include "format.h" |
67 | #include "power.h" |
68 | #include "stream.h" |
69 | |
70 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>"); |
71 | MODULE_DESCRIPTION("USB Audio"); |
72 | MODULE_LICENSE("GPL"); |
73 | MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}"); |
74 | |
75 | |
76 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ |
77 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ |
78 | static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */ |
79 | /* Vendor/product IDs for this card */ |
80 | static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; |
81 | static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; |
82 | static int nrpacks = 8; /* max. number of packets per urb */ |
83 | static int device_setup[SNDRV_CARDS]; /* device parameter for this card */ |
84 | static bool ignore_ctl_error; |
85 | static bool autoclock = true; |
86 | |
87 | module_param_array(index, int, NULL, 0444); |
88 | MODULE_PARM_DESC(index, "Index value for the USB audio adapter."); |
89 | module_param_array(id, charp, NULL, 0444); |
90 | MODULE_PARM_DESC(id, "ID string for the USB audio adapter."); |
91 | module_param_array(enable, bool, NULL, 0444); |
92 | MODULE_PARM_DESC(enable, "Enable USB audio adapter."); |
93 | module_param_array(vid, int, NULL, 0444); |
94 | MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device."); |
95 | module_param_array(pid, int, NULL, 0444); |
96 | MODULE_PARM_DESC(pid, "Product ID for the USB audio device."); |
97 | module_param(nrpacks, int, 0644); |
98 | MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB."); |
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 | module_param(autoclock, bool, 0444); |
105 | MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); |
106 | |
107 | /* |
108 | * we keep the snd_usb_audio_t instances by ourselves for merging |
109 | * the all interfaces on the same card as one sound device. |
110 | */ |
111 | |
112 | static DEFINE_MUTEX(register_mutex); |
113 | static struct snd_usb_audio *usb_chip[SNDRV_CARDS]; |
114 | static struct usb_driver usb_audio_driver; |
115 | |
116 | /* |
117 | * disconnect streams |
118 | * called from snd_usb_audio_disconnect() |
119 | */ |
120 | static void snd_usb_stream_disconnect(struct list_head *head) |
121 | { |
122 | int idx; |
123 | struct snd_usb_stream *as; |
124 | struct snd_usb_substream *subs; |
125 | |
126 | as = list_entry(head, struct snd_usb_stream, list); |
127 | for (idx = 0; idx < 2; idx++) { |
128 | subs = &as->substream[idx]; |
129 | if (!subs->num_formats) |
130 | continue; |
131 | subs->interface = -1; |
132 | subs->data_endpoint = NULL; |
133 | subs->sync_endpoint = NULL; |
134 | } |
135 | } |
136 | |
137 | static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface) |
138 | { |
139 | struct usb_device *dev = chip->dev; |
140 | struct usb_host_interface *alts; |
141 | struct usb_interface_descriptor *altsd; |
142 | struct usb_interface *iface = usb_ifnum_to_if(dev, interface); |
143 | |
144 | if (!iface) { |
145 | snd_printk(KERN_ERR "%d:%u:%d : does not exist\n", |
146 | dev->devnum, ctrlif, interface); |
147 | return -EINVAL; |
148 | } |
149 | |
150 | alts = &iface->altsetting[0]; |
151 | altsd = get_iface_desc(alts); |
152 | |
153 | /* |
154 | * Android with both accessory and audio interfaces enabled gets the |
155 | * interface numbers wrong. |
156 | */ |
157 | if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || |
158 | chip->usb_id == USB_ID(0x18d1, 0x2d05)) && |
159 | interface == 0 && |
160 | altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && |
161 | altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { |
162 | interface = 2; |
163 | iface = usb_ifnum_to_if(dev, interface); |
164 | if (!iface) |
165 | return -EINVAL; |
166 | alts = &iface->altsetting[0]; |
167 | altsd = get_iface_desc(alts); |
168 | } |
169 | |
170 | if (usb_interface_claimed(iface)) { |
171 | snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", |
172 | dev->devnum, ctrlif, interface); |
173 | return -EINVAL; |
174 | } |
175 | |
176 | if ((altsd->bInterfaceClass == USB_CLASS_AUDIO || |
177 | altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) && |
178 | altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) { |
179 | int err = snd_usbmidi_create(chip->card, iface, |
180 | &chip->midi_list, NULL); |
181 | if (err < 0) { |
182 | snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", |
183 | dev->devnum, ctrlif, interface); |
184 | return -EINVAL; |
185 | } |
186 | usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | if ((altsd->bInterfaceClass != USB_CLASS_AUDIO && |
192 | altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) || |
193 | altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) { |
194 | snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", |
195 | dev->devnum, ctrlif, interface, altsd->bInterfaceClass); |
196 | /* skip non-supported classes */ |
197 | return -EINVAL; |
198 | } |
199 | |
200 | if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { |
201 | snd_printk(KERN_ERR "low speed audio streaming not supported\n"); |
202 | return -EINVAL; |
203 | } |
204 | |
205 | if (! snd_usb_parse_audio_interface(chip, interface)) { |
206 | usb_set_interface(dev, interface, 0); /* reset the current interface */ |
207 | usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L); |
208 | return -EINVAL; |
209 | } |
210 | |
211 | return 0; |
212 | } |
213 | |
214 | /* |
215 | * parse audio control descriptor and create pcm/midi streams |
216 | */ |
217 | static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif) |
218 | { |
219 | struct usb_device *dev = chip->dev; |
220 | struct usb_host_interface *host_iface; |
221 | struct usb_interface_descriptor *altsd; |
222 | void *control_header; |
223 | int i, protocol; |
224 | |
225 | /* find audiocontrol interface */ |
226 | host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; |
227 | control_header = snd_usb_find_csint_desc(host_iface->extra, |
228 | host_iface->extralen, |
229 | NULL, UAC_HEADER); |
230 | altsd = get_iface_desc(host_iface); |
231 | protocol = altsd->bInterfaceProtocol; |
232 | |
233 | if (!control_header) { |
234 | snd_printk(KERN_ERR "cannot find UAC_HEADER\n"); |
235 | return -EINVAL; |
236 | } |
237 | |
238 | switch (protocol) { |
239 | default: |
240 | snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n", |
241 | protocol); |
242 | /* fall through */ |
243 | |
244 | case UAC_VERSION_1: { |
245 | struct uac1_ac_header_descriptor *h1 = control_header; |
246 | |
247 | if (!h1->bInCollection) { |
248 | snd_printk(KERN_INFO "skipping empty audio interface (v1)\n"); |
249 | return -EINVAL; |
250 | } |
251 | |
252 | if (h1->bLength < sizeof(*h1) + h1->bInCollection) { |
253 | snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n"); |
254 | return -EINVAL; |
255 | } |
256 | |
257 | for (i = 0; i < h1->bInCollection; i++) |
258 | snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]); |
259 | |
260 | break; |
261 | } |
262 | |
263 | case UAC_VERSION_2: { |
264 | struct usb_interface_assoc_descriptor *assoc = |
265 | usb_ifnum_to_if(dev, ctrlif)->intf_assoc; |
266 | |
267 | if (!assoc) { |
268 | /* |
269 | * Firmware writers cannot count to three. So to find |
270 | * the IAD on the NuForce UDH-100, also check the next |
271 | * interface. |
272 | */ |
273 | struct usb_interface *iface = |
274 | usb_ifnum_to_if(dev, ctrlif + 1); |
275 | if (iface && |
276 | iface->intf_assoc && |
277 | iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && |
278 | iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) |
279 | assoc = iface->intf_assoc; |
280 | } |
281 | |
282 | if (!assoc) { |
283 | snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n"); |
284 | return -EINVAL; |
285 | } |
286 | |
287 | for (i = 0; i < assoc->bInterfaceCount; i++) { |
288 | int intf = assoc->bFirstInterface + i; |
289 | |
290 | if (intf != ctrlif) |
291 | snd_usb_create_stream(chip, ctrlif, intf); |
292 | } |
293 | |
294 | break; |
295 | } |
296 | } |
297 | |
298 | return 0; |
299 | } |
300 | |
301 | /* |
302 | * free the chip instance |
303 | * |
304 | * here we have to do not much, since pcm and controls are already freed |
305 | * |
306 | */ |
307 | |
308 | static int snd_usb_audio_free(struct snd_usb_audio *chip) |
309 | { |
310 | mutex_destroy(&chip->mutex); |
311 | kfree(chip); |
312 | return 0; |
313 | } |
314 | |
315 | static int snd_usb_audio_dev_free(struct snd_device *device) |
316 | { |
317 | struct snd_usb_audio *chip = device->device_data; |
318 | return snd_usb_audio_free(chip); |
319 | } |
320 | |
321 | static void remove_trailing_spaces(char *str) |
322 | { |
323 | char *p; |
324 | |
325 | if (!*str) |
326 | return; |
327 | for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--) |
328 | *p = 0; |
329 | } |
330 | |
331 | /* |
332 | * create a chip instance and set its names. |
333 | */ |
334 | static int snd_usb_audio_create(struct usb_device *dev, int idx, |
335 | const struct snd_usb_audio_quirk *quirk, |
336 | struct snd_usb_audio **rchip) |
337 | { |
338 | struct snd_card *card; |
339 | struct snd_usb_audio *chip; |
340 | int err, len; |
341 | char component[14]; |
342 | static struct snd_device_ops ops = { |
343 | .dev_free = snd_usb_audio_dev_free, |
344 | }; |
345 | |
346 | *rchip = NULL; |
347 | |
348 | switch (snd_usb_get_speed(dev)) { |
349 | case USB_SPEED_LOW: |
350 | case USB_SPEED_FULL: |
351 | case USB_SPEED_HIGH: |
352 | case USB_SPEED_SUPER: |
353 | break; |
354 | default: |
355 | snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev)); |
356 | return -ENXIO; |
357 | } |
358 | |
359 | err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card); |
360 | if (err < 0) { |
361 | snd_printk(KERN_ERR "cannot create card instance %d\n", idx); |
362 | return err; |
363 | } |
364 | |
365 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
366 | if (! chip) { |
367 | snd_card_free(card); |
368 | return -ENOMEM; |
369 | } |
370 | |
371 | mutex_init(&chip->mutex); |
372 | init_rwsem(&chip->shutdown_rwsem); |
373 | chip->index = idx; |
374 | chip->dev = dev; |
375 | chip->card = card; |
376 | chip->setup = device_setup[idx]; |
377 | chip->nrpacks = nrpacks; |
378 | chip->autoclock = autoclock; |
379 | chip->probing = 1; |
380 | |
381 | chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), |
382 | le16_to_cpu(dev->descriptor.idProduct)); |
383 | INIT_LIST_HEAD(&chip->pcm_list); |
384 | INIT_LIST_HEAD(&chip->ep_list); |
385 | INIT_LIST_HEAD(&chip->midi_list); |
386 | INIT_LIST_HEAD(&chip->mixer_list); |
387 | |
388 | if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { |
389 | snd_usb_audio_free(chip); |
390 | snd_card_free(card); |
391 | return err; |
392 | } |
393 | |
394 | strcpy(card->driver, "USB-Audio"); |
395 | sprintf(component, "USB%04x:%04x", |
396 | USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id)); |
397 | snd_component_add(card, component); |
398 | |
399 | /* retrieve the device string as shortname */ |
400 | if (quirk && quirk->product_name && *quirk->product_name) { |
401 | strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname)); |
402 | } else { |
403 | if (!dev->descriptor.iProduct || |
404 | usb_string(dev, dev->descriptor.iProduct, |
405 | card->shortname, sizeof(card->shortname)) <= 0) { |
406 | /* no name available from anywhere, so use ID */ |
407 | sprintf(card->shortname, "USB Device %#04x:%#04x", |
408 | USB_ID_VENDOR(chip->usb_id), |
409 | USB_ID_PRODUCT(chip->usb_id)); |
410 | } |
411 | } |
412 | remove_trailing_spaces(card->shortname); |
413 | |
414 | /* retrieve the vendor and device strings as longname */ |
415 | if (quirk && quirk->vendor_name && *quirk->vendor_name) { |
416 | len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); |
417 | } else { |
418 | if (dev->descriptor.iManufacturer) |
419 | len = usb_string(dev, dev->descriptor.iManufacturer, |
420 | card->longname, sizeof(card->longname)); |
421 | else |
422 | len = 0; |
423 | /* we don't really care if there isn't any vendor string */ |
424 | } |
425 | if (len > 0) { |
426 | remove_trailing_spaces(card->longname); |
427 | if (*card->longname) |
428 | strlcat(card->longname, " ", sizeof(card->longname)); |
429 | } |
430 | |
431 | strlcat(card->longname, card->shortname, sizeof(card->longname)); |
432 | |
433 | len = strlcat(card->longname, " at ", sizeof(card->longname)); |
434 | |
435 | if (len < sizeof(card->longname)) |
436 | usb_make_path(dev, card->longname + len, sizeof(card->longname) - len); |
437 | |
438 | switch (snd_usb_get_speed(dev)) { |
439 | case USB_SPEED_LOW: |
440 | strlcat(card->longname, ", low speed", sizeof(card->longname)); |
441 | break; |
442 | case USB_SPEED_FULL: |
443 | strlcat(card->longname, ", full speed", sizeof(card->longname)); |
444 | break; |
445 | case USB_SPEED_HIGH: |
446 | strlcat(card->longname, ", high speed", sizeof(card->longname)); |
447 | break; |
448 | case USB_SPEED_SUPER: |
449 | strlcat(card->longname, ", super speed", sizeof(card->longname)); |
450 | break; |
451 | default: |
452 | break; |
453 | } |
454 | |
455 | snd_usb_audio_create_proc(chip); |
456 | |
457 | *rchip = chip; |
458 | return 0; |
459 | } |
460 | |
461 | /* |
462 | * probe the active usb device |
463 | * |
464 | * note that this can be called multiple times per a device, when it |
465 | * includes multiple audio control interfaces. |
466 | * |
467 | * thus we check the usb device pointer and creates the card instance |
468 | * only at the first time. the successive calls of this function will |
469 | * append the pcm interface to the corresponding card. |
470 | */ |
471 | static struct snd_usb_audio * |
472 | snd_usb_audio_probe(struct usb_device *dev, |
473 | struct usb_interface *intf, |
474 | const struct usb_device_id *usb_id) |
475 | { |
476 | const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info; |
477 | int i, err; |
478 | struct snd_usb_audio *chip; |
479 | struct usb_host_interface *alts; |
480 | int ifnum; |
481 | u32 id; |
482 | |
483 | alts = &intf->altsetting[0]; |
484 | ifnum = get_iface_desc(alts)->bInterfaceNumber; |
485 | id = USB_ID(le16_to_cpu(dev->descriptor.idVendor), |
486 | le16_to_cpu(dev->descriptor.idProduct)); |
487 | if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) |
488 | goto __err_val; |
489 | |
490 | if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0) |
491 | goto __err_val; |
492 | |
493 | /* |
494 | * found a config. now register to ALSA |
495 | */ |
496 | |
497 | /* check whether it's already registered */ |
498 | chip = NULL; |
499 | mutex_lock(®ister_mutex); |
500 | for (i = 0; i < SNDRV_CARDS; i++) { |
501 | if (usb_chip[i] && usb_chip[i]->dev == dev) { |
502 | if (usb_chip[i]->shutdown) { |
503 | snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n"); |
504 | goto __error; |
505 | } |
506 | chip = usb_chip[i]; |
507 | chip->probing = 1; |
508 | break; |
509 | } |
510 | } |
511 | if (! chip) { |
512 | /* it's a fresh one. |
513 | * now look for an empty slot and create a new card instance |
514 | */ |
515 | for (i = 0; i < SNDRV_CARDS; i++) |
516 | if (enable[i] && ! usb_chip[i] && |
517 | (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && |
518 | (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { |
519 | if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) { |
520 | goto __error; |
521 | } |
522 | snd_card_set_dev(chip->card, &intf->dev); |
523 | chip->pm_intf = intf; |
524 | break; |
525 | } |
526 | if (!chip) { |
527 | printk(KERN_ERR "no available usb audio device\n"); |
528 | goto __error; |
529 | } |
530 | } |
531 | |
532 | /* |
533 | * For devices with more than one control interface, we assume the |
534 | * first contains the audio controls. We might need a more specific |
535 | * check here in the future. |
536 | */ |
537 | if (!chip->ctrl_intf) |
538 | chip->ctrl_intf = alts; |
539 | |
540 | chip->txfr_quirk = 0; |
541 | err = 1; /* continue */ |
542 | if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) { |
543 | /* need some special handlings */ |
544 | if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0) |
545 | goto __error; |
546 | } |
547 | |
548 | if (err > 0) { |
549 | /* create normal USB audio interfaces */ |
550 | if (snd_usb_create_streams(chip, ifnum) < 0 || |
551 | snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) { |
552 | goto __error; |
553 | } |
554 | } |
555 | |
556 | /* we are allowed to call snd_card_register() many times */ |
557 | if (snd_card_register(chip->card) < 0) { |
558 | goto __error; |
559 | } |
560 | |
561 | usb_chip[chip->index] = chip; |
562 | chip->num_interfaces++; |
563 | chip->probing = 0; |
564 | mutex_unlock(®ister_mutex); |
565 | return chip; |
566 | |
567 | __error: |
568 | if (chip) { |
569 | if (!chip->num_interfaces) |
570 | snd_card_free(chip->card); |
571 | chip->probing = 0; |
572 | } |
573 | mutex_unlock(®ister_mutex); |
574 | __err_val: |
575 | return NULL; |
576 | } |
577 | |
578 | /* |
579 | * we need to take care of counter, since disconnection can be called also |
580 | * many times as well as usb_audio_probe(). |
581 | */ |
582 | static void snd_usb_audio_disconnect(struct usb_device *dev, |
583 | struct snd_usb_audio *chip) |
584 | { |
585 | struct snd_card *card; |
586 | struct list_head *p, *n; |
587 | |
588 | if (chip == (void *)-1L) |
589 | return; |
590 | |
591 | card = chip->card; |
592 | down_write(&chip->shutdown_rwsem); |
593 | chip->shutdown = 1; |
594 | up_write(&chip->shutdown_rwsem); |
595 | |
596 | mutex_lock(®ister_mutex); |
597 | chip->num_interfaces--; |
598 | if (chip->num_interfaces <= 0) { |
599 | snd_card_disconnect(card); |
600 | /* release the pcm resources */ |
601 | list_for_each(p, &chip->pcm_list) { |
602 | snd_usb_stream_disconnect(p); |
603 | } |
604 | /* release the endpoint resources */ |
605 | list_for_each_safe(p, n, &chip->ep_list) { |
606 | snd_usb_endpoint_free(p); |
607 | } |
608 | /* release the midi resources */ |
609 | list_for_each(p, &chip->midi_list) { |
610 | snd_usbmidi_disconnect(p); |
611 | } |
612 | /* release mixer resources */ |
613 | list_for_each(p, &chip->mixer_list) { |
614 | snd_usb_mixer_disconnect(p); |
615 | } |
616 | usb_chip[chip->index] = NULL; |
617 | mutex_unlock(®ister_mutex); |
618 | snd_card_free_when_closed(card); |
619 | } else { |
620 | mutex_unlock(®ister_mutex); |
621 | } |
622 | } |
623 | |
624 | /* |
625 | * new 2.5 USB kernel API |
626 | */ |
627 | static int usb_audio_probe(struct usb_interface *intf, |
628 | const struct usb_device_id *id) |
629 | { |
630 | struct snd_usb_audio *chip; |
631 | chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id); |
632 | if (chip) { |
633 | usb_set_intfdata(intf, chip); |
634 | return 0; |
635 | } else |
636 | return -EIO; |
637 | } |
638 | |
639 | static void usb_audio_disconnect(struct usb_interface *intf) |
640 | { |
641 | snd_usb_audio_disconnect(interface_to_usbdev(intf), |
642 | usb_get_intfdata(intf)); |
643 | } |
644 | |
645 | #ifdef CONFIG_PM |
646 | |
647 | int snd_usb_autoresume(struct snd_usb_audio *chip) |
648 | { |
649 | int err = -ENODEV; |
650 | |
651 | down_read(&chip->shutdown_rwsem); |
652 | if (chip->probing) |
653 | err = 0; |
654 | else if (!chip->shutdown) |
655 | err = usb_autopm_get_interface(chip->pm_intf); |
656 | up_read(&chip->shutdown_rwsem); |
657 | |
658 | return err; |
659 | } |
660 | |
661 | void snd_usb_autosuspend(struct snd_usb_audio *chip) |
662 | { |
663 | down_read(&chip->shutdown_rwsem); |
664 | if (!chip->shutdown && !chip->probing) |
665 | usb_autopm_put_interface(chip->pm_intf); |
666 | up_read(&chip->shutdown_rwsem); |
667 | } |
668 | |
669 | static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) |
670 | { |
671 | struct snd_usb_audio *chip = usb_get_intfdata(intf); |
672 | struct snd_usb_stream *as; |
673 | struct usb_mixer_interface *mixer; |
674 | |
675 | if (chip == (void *)-1L) |
676 | return 0; |
677 | |
678 | if (!PMSG_IS_AUTO(message)) { |
679 | snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); |
680 | if (!chip->num_suspended_intf++) { |
681 | list_for_each_entry(as, &chip->pcm_list, list) { |
682 | snd_pcm_suspend_all(as->pcm); |
683 | as->substream[0].need_setup_ep = |
684 | as->substream[1].need_setup_ep = true; |
685 | } |
686 | } |
687 | } else { |
688 | /* |
689 | * otherwise we keep the rest of the system in the dark |
690 | * to keep this transparent |
691 | */ |
692 | if (!chip->num_suspended_intf++) |
693 | chip->autosuspended = 1; |
694 | } |
695 | |
696 | list_for_each_entry(mixer, &chip->mixer_list, list) |
697 | snd_usb_mixer_inactivate(mixer); |
698 | |
699 | return 0; |
700 | } |
701 | |
702 | static int usb_audio_resume(struct usb_interface *intf) |
703 | { |
704 | struct snd_usb_audio *chip = usb_get_intfdata(intf); |
705 | struct usb_mixer_interface *mixer; |
706 | int err = 0; |
707 | |
708 | if (chip == (void *)-1L) |
709 | return 0; |
710 | if (--chip->num_suspended_intf) |
711 | return 0; |
712 | /* |
713 | * ALSA leaves material resumption to user space |
714 | * we just notify and restart the mixers |
715 | */ |
716 | list_for_each_entry(mixer, &chip->mixer_list, list) { |
717 | err = snd_usb_mixer_activate(mixer); |
718 | if (err < 0) |
719 | goto err_out; |
720 | } |
721 | |
722 | if (!chip->autosuspended) |
723 | snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); |
724 | chip->autosuspended = 0; |
725 | |
726 | err_out: |
727 | return err; |
728 | } |
729 | #else |
730 | #define usb_audio_suspend NULL |
731 | #define usb_audio_resume NULL |
732 | #endif /* CONFIG_PM */ |
733 | |
734 | static struct usb_device_id usb_audio_ids [] = { |
735 | #include "quirks-table.h" |
736 | { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS), |
737 | .bInterfaceClass = USB_CLASS_AUDIO, |
738 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL }, |
739 | { } /* Terminating entry */ |
740 | }; |
741 | MODULE_DEVICE_TABLE(usb, usb_audio_ids); |
742 | |
743 | /* |
744 | * entry point for linux usb interface |
745 | */ |
746 | |
747 | static struct usb_driver usb_audio_driver = { |
748 | .name = "snd-usb-audio", |
749 | .probe = usb_audio_probe, |
750 | .disconnect = usb_audio_disconnect, |
751 | .suspend = usb_audio_suspend, |
752 | .resume = usb_audio_resume, |
753 | .id_table = usb_audio_ids, |
754 | .supports_autosuspend = 1, |
755 | }; |
756 | |
757 | static int __init snd_usb_audio_init(void) |
758 | { |
759 | if (nrpacks < 1 || nrpacks > MAX_PACKS) { |
760 | printk(KERN_WARNING "invalid nrpacks value.\n"); |
761 | return -EINVAL; |
762 | } |
763 | return usb_register(&usb_audio_driver); |
764 | } |
765 | |
766 | static void __exit snd_usb_audio_cleanup(void) |
767 | { |
768 | usb_deregister(&usb_audio_driver); |
769 | } |
770 | |
771 | module_init(snd_usb_audio_init); |
772 | module_exit(snd_usb_audio_cleanup); |
773 |
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