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