mirror of https://gitee.com/openkylin/linux.git
726 lines
19 KiB
C
726 lines
19 KiB
C
/*
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* (Tentative) USB Audio Driver for ALSA
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*
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* Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
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*
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* Many codes borrowed from audio.c by
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* Alan Cox (alan@lxorguk.ukuu.org.uk)
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* Thomas Sailer (sailer@ife.ee.ethz.ch)
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* NOTES:
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*
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* - async unlink should be used for avoiding the sleep inside lock.
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* 2.4.22 usb-uhci seems buggy for async unlinking and results in
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* oops. in such a cse, pass async_unlink=0 option.
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* - the linked URBs would be preferred but not used so far because of
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* the instability of unlinking.
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* - type II is not supported properly. there is no device which supports
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* this type *correctly*. SB extigy looks as if it supports, but it's
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* indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
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*/
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/usb.h>
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#include <linux/moduleparam.h>
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#include <linux/mutex.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <sound/control.h>
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#include <sound/core.h>
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#include <sound/info.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include "usbaudio.h"
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#include "card.h"
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#include "midi.h"
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#include "mixer.h"
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#include "proc.h"
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#include "quirks.h"
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#include "endpoint.h"
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#include "helper.h"
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#include "debug.h"
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#include "pcm.h"
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#include "urb.h"
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#include "format.h"
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#include "power.h"
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MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
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MODULE_DESCRIPTION("USB Audio");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card */
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/* Vendor/product IDs for this card */
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static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int nrpacks = 8; /* max. number of packets per urb */
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static int async_unlink = 1;
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static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
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static int ignore_ctl_error;
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
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module_param_array(vid, int, NULL, 0444);
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MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
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module_param_array(pid, int, NULL, 0444);
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MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
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module_param(nrpacks, int, 0644);
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MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
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module_param(async_unlink, bool, 0444);
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MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
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module_param_array(device_setup, int, NULL, 0444);
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MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
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module_param(ignore_ctl_error, bool, 0444);
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MODULE_PARM_DESC(ignore_ctl_error,
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"Ignore errors from USB controller for mixer interfaces.");
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/*
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* we keep the snd_usb_audio_t instances by ourselves for merging
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* the all interfaces on the same card as one sound device.
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*/
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static DEFINE_MUTEX(register_mutex);
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static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
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static struct usb_driver usb_audio_driver;
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/*
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* disconnect streams
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* called from snd_usb_audio_disconnect()
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*/
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static void snd_usb_stream_disconnect(struct list_head *head)
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{
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int idx;
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struct snd_usb_stream *as;
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struct snd_usb_substream *subs;
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as = list_entry(head, struct snd_usb_stream, list);
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for (idx = 0; idx < 2; idx++) {
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subs = &as->substream[idx];
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if (!subs->num_formats)
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continue;
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snd_usb_release_substream_urbs(subs, 1);
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subs->interface = -1;
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}
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}
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static int snd_usb_create_stream(struct snd_usb_audio *chip, int ctrlif, int interface)
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{
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struct usb_device *dev = chip->dev;
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struct usb_host_interface *alts;
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struct usb_interface_descriptor *altsd;
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struct usb_interface *iface = usb_ifnum_to_if(dev, interface);
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if (!iface) {
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snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
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dev->devnum, ctrlif, interface);
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return -EINVAL;
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}
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if (usb_interface_claimed(iface)) {
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snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n",
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dev->devnum, ctrlif, interface);
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return -EINVAL;
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}
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alts = &iface->altsetting[0];
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altsd = get_iface_desc(alts);
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if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
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altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
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altsd->bInterfaceSubClass == USB_SUBCLASS_MIDISTREAMING) {
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int err = snd_usbmidi_create(chip->card, iface,
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&chip->midi_list, NULL);
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if (err < 0) {
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snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n",
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dev->devnum, ctrlif, interface);
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return -EINVAL;
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}
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usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
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return 0;
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}
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if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
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altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
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altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING) {
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snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n",
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dev->devnum, ctrlif, interface, altsd->bInterfaceClass);
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/* skip non-supported classes */
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return -EINVAL;
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}
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if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
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snd_printk(KERN_ERR "low speed audio streaming not supported\n");
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return -EINVAL;
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}
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if (! snd_usb_parse_audio_endpoints(chip, interface)) {
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usb_set_interface(dev, interface, 0); /* reset the current interface */
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usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
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return -EINVAL;
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}
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return 0;
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}
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/*
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* parse audio control descriptor and create pcm/midi streams
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*/
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static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
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{
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struct usb_device *dev = chip->dev;
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struct usb_host_interface *host_iface;
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struct usb_interface_descriptor *altsd;
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void *control_header;
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int i, protocol;
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/* find audiocontrol interface */
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host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
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control_header = snd_usb_find_csint_desc(host_iface->extra,
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host_iface->extralen,
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NULL, UAC_HEADER);
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altsd = get_iface_desc(host_iface);
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protocol = altsd->bInterfaceProtocol;
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if (!control_header) {
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snd_printk(KERN_ERR "cannot find UAC_HEADER\n");
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return -EINVAL;
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}
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switch (protocol) {
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default:
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snd_printdd(KERN_WARNING "unknown interface protocol %#02x, assuming v1\n",
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protocol);
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/* fall through */
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case UAC_VERSION_1: {
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struct uac1_ac_header_descriptor *h1 = control_header;
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if (!h1->bInCollection) {
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snd_printk(KERN_INFO "skipping empty audio interface (v1)\n");
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return -EINVAL;
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}
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if (h1->bLength < sizeof(*h1) + h1->bInCollection) {
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snd_printk(KERN_ERR "invalid UAC_HEADER (v1)\n");
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return -EINVAL;
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}
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for (i = 0; i < h1->bInCollection; i++)
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snd_usb_create_stream(chip, ctrlif, h1->baInterfaceNr[i]);
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break;
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}
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case UAC_VERSION_2: {
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struct usb_interface_assoc_descriptor *assoc =
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usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
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if (!assoc) {
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snd_printk(KERN_ERR "Audio class v2 interfaces need an interface association\n");
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return -EINVAL;
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}
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for (i = 0; i < assoc->bInterfaceCount; i++) {
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int intf = assoc->bFirstInterface + i;
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if (intf != ctrlif)
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snd_usb_create_stream(chip, ctrlif, intf);
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}
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break;
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}
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}
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return 0;
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}
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/*
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* free the chip instance
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*
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* here we have to do not much, since pcm and controls are already freed
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*
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*/
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static int snd_usb_audio_free(struct snd_usb_audio *chip)
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{
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kfree(chip);
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return 0;
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}
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static int snd_usb_audio_dev_free(struct snd_device *device)
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{
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struct snd_usb_audio *chip = device->device_data;
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return snd_usb_audio_free(chip);
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}
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static void remove_trailing_spaces(char *str)
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{
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char *p;
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if (!*str)
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return;
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for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
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*p = 0;
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}
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/*
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* create a chip instance and set its names.
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*/
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static int snd_usb_audio_create(struct usb_device *dev, int idx,
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const struct snd_usb_audio_quirk *quirk,
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struct snd_usb_audio **rchip)
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{
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struct snd_card *card;
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struct snd_usb_audio *chip;
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int err, len;
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char component[14];
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static struct snd_device_ops ops = {
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.dev_free = snd_usb_audio_dev_free,
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};
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*rchip = NULL;
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switch (snd_usb_get_speed(dev)) {
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case USB_SPEED_LOW:
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case USB_SPEED_FULL:
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case USB_SPEED_HIGH:
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case USB_SPEED_SUPER:
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break;
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default:
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snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
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return -ENXIO;
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}
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err = snd_card_create(index[idx], id[idx], THIS_MODULE, 0, &card);
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if (err < 0) {
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snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
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return err;
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}
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chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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if (! chip) {
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snd_card_free(card);
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return -ENOMEM;
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}
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mutex_init(&chip->shutdown_mutex);
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chip->index = idx;
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chip->dev = dev;
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chip->card = card;
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chip->setup = device_setup[idx];
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chip->nrpacks = nrpacks;
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chip->async_unlink = async_unlink;
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chip->probing = 1;
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chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
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le16_to_cpu(dev->descriptor.idProduct));
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INIT_LIST_HEAD(&chip->pcm_list);
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INIT_LIST_HEAD(&chip->midi_list);
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INIT_LIST_HEAD(&chip->mixer_list);
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if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
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snd_usb_audio_free(chip);
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snd_card_free(card);
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return err;
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}
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strcpy(card->driver, "USB-Audio");
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sprintf(component, "USB%04x:%04x",
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USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
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snd_component_add(card, component);
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/* retrieve the device string as shortname */
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if (quirk && quirk->product_name && *quirk->product_name) {
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strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
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} else {
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if (!dev->descriptor.iProduct ||
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usb_string(dev, dev->descriptor.iProduct,
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card->shortname, sizeof(card->shortname)) <= 0) {
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/* no name available from anywhere, so use ID */
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sprintf(card->shortname, "USB Device %#04x:%#04x",
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USB_ID_VENDOR(chip->usb_id),
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USB_ID_PRODUCT(chip->usb_id));
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}
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}
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remove_trailing_spaces(card->shortname);
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/* retrieve the vendor and device strings as longname */
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if (quirk && quirk->vendor_name && *quirk->vendor_name) {
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len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
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} else {
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if (dev->descriptor.iManufacturer)
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len = usb_string(dev, dev->descriptor.iManufacturer,
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card->longname, sizeof(card->longname));
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else
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len = 0;
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/* we don't really care if there isn't any vendor string */
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}
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if (len > 0) {
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remove_trailing_spaces(card->longname);
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if (*card->longname)
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strlcat(card->longname, " ", sizeof(card->longname));
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}
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strlcat(card->longname, card->shortname, sizeof(card->longname));
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len = strlcat(card->longname, " at ", sizeof(card->longname));
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if (len < sizeof(card->longname))
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usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
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switch (snd_usb_get_speed(dev)) {
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case USB_SPEED_LOW:
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strlcat(card->longname, ", low speed", sizeof(card->longname));
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break;
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case USB_SPEED_FULL:
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strlcat(card->longname, ", full speed", sizeof(card->longname));
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break;
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case USB_SPEED_HIGH:
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strlcat(card->longname, ", high speed", sizeof(card->longname));
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break;
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case USB_SPEED_SUPER:
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strlcat(card->longname, ", super speed", sizeof(card->longname));
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break;
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default:
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break;
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}
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snd_usb_audio_create_proc(chip);
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*rchip = chip;
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return 0;
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}
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/*
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* probe the active usb device
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*
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* note that this can be called multiple times per a device, when it
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* includes multiple audio control interfaces.
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*
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* thus we check the usb device pointer and creates the card instance
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* only at the first time. the successive calls of this function will
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* append the pcm interface to the corresponding card.
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*/
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static void *snd_usb_audio_probe(struct usb_device *dev,
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struct usb_interface *intf,
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const struct usb_device_id *usb_id)
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{
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const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
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int i, err;
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struct snd_usb_audio *chip;
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struct usb_host_interface *alts;
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int ifnum;
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u32 id;
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alts = &intf->altsetting[0];
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ifnum = get_iface_desc(alts)->bInterfaceNumber;
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id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
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le16_to_cpu(dev->descriptor.idProduct));
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if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
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goto __err_val;
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if (snd_usb_apply_boot_quirk(dev, intf, quirk) < 0)
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goto __err_val;
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/*
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* found a config. now register to ALSA
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*/
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/* check whether it's already registered */
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chip = NULL;
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mutex_lock(®ister_mutex);
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for (i = 0; i < SNDRV_CARDS; i++) {
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if (usb_chip[i] && usb_chip[i]->dev == dev) {
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if (usb_chip[i]->shutdown) {
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snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
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goto __error;
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}
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chip = usb_chip[i];
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chip->probing = 1;
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break;
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}
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}
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if (! chip) {
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/* it's a fresh one.
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* now look for an empty slot and create a new card instance
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*/
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for (i = 0; i < SNDRV_CARDS; i++)
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if (enable[i] && ! usb_chip[i] &&
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(vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
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(pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
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if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
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goto __error;
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}
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snd_card_set_dev(chip->card, &intf->dev);
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chip->pm_intf = intf;
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break;
|
|
}
|
|
if (!chip) {
|
|
printk(KERN_ERR "no available usb audio device\n");
|
|
goto __error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For devices with more than one control interface, we assume the
|
|
* first contains the audio controls. We might need a more specific
|
|
* check here in the future.
|
|
*/
|
|
if (!chip->ctrl_intf)
|
|
chip->ctrl_intf = alts;
|
|
|
|
chip->txfr_quirk = 0;
|
|
err = 1; /* continue */
|
|
if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
|
|
/* need some special handlings */
|
|
if ((err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk)) < 0)
|
|
goto __error;
|
|
}
|
|
|
|
if (err > 0) {
|
|
/* create normal USB audio interfaces */
|
|
if (snd_usb_create_streams(chip, ifnum) < 0 ||
|
|
snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
|
|
goto __error;
|
|
}
|
|
}
|
|
|
|
/* we are allowed to call snd_card_register() many times */
|
|
if (snd_card_register(chip->card) < 0) {
|
|
goto __error;
|
|
}
|
|
|
|
usb_chip[chip->index] = chip;
|
|
chip->num_interfaces++;
|
|
chip->probing = 0;
|
|
mutex_unlock(®ister_mutex);
|
|
return chip;
|
|
|
|
__error:
|
|
if (chip && !chip->num_interfaces)
|
|
snd_card_free(chip->card);
|
|
mutex_unlock(®ister_mutex);
|
|
__err_val:
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* we need to take care of counter, since disconnection can be called also
|
|
* many times as well as usb_audio_probe().
|
|
*/
|
|
static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
|
|
{
|
|
struct snd_usb_audio *chip;
|
|
struct snd_card *card;
|
|
struct list_head *p;
|
|
|
|
if (ptr == (void *)-1L)
|
|
return;
|
|
|
|
chip = ptr;
|
|
card = chip->card;
|
|
mutex_lock(®ister_mutex);
|
|
mutex_lock(&chip->shutdown_mutex);
|
|
chip->shutdown = 1;
|
|
chip->num_interfaces--;
|
|
if (chip->num_interfaces <= 0) {
|
|
snd_card_disconnect(card);
|
|
/* release the pcm resources */
|
|
list_for_each(p, &chip->pcm_list) {
|
|
snd_usb_stream_disconnect(p);
|
|
}
|
|
/* release the midi resources */
|
|
list_for_each(p, &chip->midi_list) {
|
|
snd_usbmidi_disconnect(p);
|
|
}
|
|
/* release mixer resources */
|
|
list_for_each(p, &chip->mixer_list) {
|
|
snd_usb_mixer_disconnect(p);
|
|
}
|
|
usb_chip[chip->index] = NULL;
|
|
mutex_unlock(&chip->shutdown_mutex);
|
|
mutex_unlock(®ister_mutex);
|
|
snd_card_free_when_closed(card);
|
|
} else {
|
|
mutex_unlock(&chip->shutdown_mutex);
|
|
mutex_unlock(®ister_mutex);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* new 2.5 USB kernel API
|
|
*/
|
|
static int usb_audio_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
void *chip;
|
|
chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
|
|
if (chip) {
|
|
usb_set_intfdata(intf, chip);
|
|
return 0;
|
|
} else
|
|
return -EIO;
|
|
}
|
|
|
|
static void usb_audio_disconnect(struct usb_interface *intf)
|
|
{
|
|
snd_usb_audio_disconnect(interface_to_usbdev(intf),
|
|
usb_get_intfdata(intf));
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
int snd_usb_autoresume(struct snd_usb_audio *chip)
|
|
{
|
|
int err = -ENODEV;
|
|
|
|
if (!chip->shutdown && !chip->probing)
|
|
err = usb_autopm_get_interface(chip->pm_intf);
|
|
|
|
return err;
|
|
}
|
|
|
|
void snd_usb_autosuspend(struct snd_usb_audio *chip)
|
|
{
|
|
if (!chip->shutdown && !chip->probing)
|
|
usb_autopm_put_interface(chip->pm_intf);
|
|
}
|
|
|
|
static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct snd_usb_audio *chip = usb_get_intfdata(intf);
|
|
struct list_head *p;
|
|
struct snd_usb_stream *as;
|
|
struct usb_mixer_interface *mixer;
|
|
|
|
if (chip == (void *)-1L)
|
|
return 0;
|
|
|
|
if (!(message.event & PM_EVENT_AUTO)) {
|
|
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
|
|
if (!chip->num_suspended_intf++) {
|
|
list_for_each(p, &chip->pcm_list) {
|
|
as = list_entry(p, struct snd_usb_stream, list);
|
|
snd_pcm_suspend_all(as->pcm);
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* otherwise we keep the rest of the system in the dark
|
|
* to keep this transparent
|
|
*/
|
|
if (!chip->num_suspended_intf++)
|
|
chip->autosuspended = 1;
|
|
}
|
|
|
|
list_for_each_entry(mixer, &chip->mixer_list, list)
|
|
snd_usb_mixer_inactivate(mixer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb_audio_resume(struct usb_interface *intf)
|
|
{
|
|
struct snd_usb_audio *chip = usb_get_intfdata(intf);
|
|
struct usb_mixer_interface *mixer;
|
|
int err = 0;
|
|
|
|
if (chip == (void *)-1L)
|
|
return 0;
|
|
if (--chip->num_suspended_intf)
|
|
return 0;
|
|
/*
|
|
* ALSA leaves material resumption to user space
|
|
* we just notify and restart the mixers
|
|
*/
|
|
list_for_each_entry(mixer, &chip->mixer_list, list) {
|
|
err = snd_usb_mixer_activate(mixer);
|
|
if (err < 0)
|
|
goto err_out;
|
|
}
|
|
|
|
if (!chip->autosuspended)
|
|
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
|
|
chip->autosuspended = 0;
|
|
|
|
err_out:
|
|
return err;
|
|
}
|
|
#else
|
|
#define usb_audio_suspend NULL
|
|
#define usb_audio_resume NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
static struct usb_device_id usb_audio_ids [] = {
|
|
#include "quirks-table.h"
|
|
{ .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
|
|
.bInterfaceClass = USB_CLASS_AUDIO,
|
|
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (usb, usb_audio_ids);
|
|
|
|
/*
|
|
* entry point for linux usb interface
|
|
*/
|
|
|
|
static struct usb_driver usb_audio_driver = {
|
|
.name = "snd-usb-audio",
|
|
.probe = usb_audio_probe,
|
|
.disconnect = usb_audio_disconnect,
|
|
.suspend = usb_audio_suspend,
|
|
.resume = usb_audio_resume,
|
|
.id_table = usb_audio_ids,
|
|
.supports_autosuspend = 1,
|
|
};
|
|
|
|
static int __init snd_usb_audio_init(void)
|
|
{
|
|
if (nrpacks < 1 || nrpacks > MAX_PACKS) {
|
|
printk(KERN_WARNING "invalid nrpacks value.\n");
|
|
return -EINVAL;
|
|
}
|
|
return usb_register(&usb_audio_driver);
|
|
}
|
|
|
|
static void __exit snd_usb_audio_cleanup(void)
|
|
{
|
|
usb_deregister(&usb_audio_driver);
|
|
}
|
|
|
|
module_init(snd_usb_audio_init);
|
|
module_exit(snd_usb_audio_cleanup);
|