/* * (Tentative) USB Audio Driver for ALSA * * Copyright (c) 2002 by Takashi Iwai * * 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: * * - 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 "); 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 device_setup[SNDRV_CARDS]; /* device parameter for this card */ static bool ignore_ctl_error; static bool autoclock = true; 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_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."); module_param(autoclock, bool, 0444); MODULE_PARM_DESC(autoclock, "Enable auto-clock selection for UAC2 devices (default: yes)."); /* * 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; subs->interface = -1; subs->data_endpoint = NULL; subs->sync_endpoint = NULL; } } 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; } alts = &iface->altsetting[0]; altsd = get_iface_desc(alts); /* * Android with both accessory and audio interfaces enabled gets the * interface numbers wrong. */ if ((chip->usb_id == USB_ID(0x18d1, 0x2d04) || chip->usb_id == USB_ID(0x18d1, 0x2d05)) && interface == 0 && altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && altsd->bInterfaceSubClass == USB_SUBCLASS_VENDOR_SPEC) { interface = 2; iface = usb_ifnum_to_if(dev, interface); if (!iface) return -EINVAL; alts = &iface->altsetting[0]; altsd = get_iface_desc(alts); } if (usb_interface_claimed(iface)) { snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", dev->devnum, ctrlif, interface); return -EINVAL; } 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; void *control_header; int i, protocol; /* find audiocontrol interface */ host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; 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_ifnum_to_if(dev, ctrlif)->intf_assoc; if (!assoc) { /* * Firmware writers cannot count to three. So to find * the IAD on the NuForce UDH-100, also check the next * interface. */ struct usb_interface *iface = usb_ifnum_to_if(dev, ctrlif + 1); if (iface && iface->intf_assoc && iface->intf_assoc->bFunctionClass == USB_CLASS_AUDIO && iface->intf_assoc->bFunctionProtocol == UAC_VERSION_2) assoc = 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) { struct list_head *p, *n; list_for_each_safe(p, n, &chip->ep_list) snd_usb_endpoint_free(p); mutex_destroy(&chip->mutex); 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_WIRELESS: 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->mutex); init_rwsem(&chip->shutdown_rwsem); chip->index = idx; chip->dev = dev; chip->card = card; chip->setup = device_setup[idx]; chip->autoclock = autoclock; 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->ep_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; down_write(&chip->shutdown_rwsem); chip->shutdown = 1; up_write(&chip->shutdown_rwsem); mutex_lock(®ister_mutex); chip->num_interfaces--; if (chip->num_interfaces <= 0) { struct snd_usb_endpoint *ep; snd_card_disconnect(card); /* release the pcm resources */ list_for_each(p, &chip->pcm_list) { snd_usb_stream_disconnect(p); } /* release the endpoint resources */ list_for_each_entry(ep, &chip->ep_list, list) { snd_usb_endpoint_release(ep); } /* 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(®ister_mutex); snd_card_free_when_closed(card); } else { 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; down_read(&chip->shutdown_rwsem); if (chip->probing) err = 0; else if (!chip->shutdown) err = usb_autopm_get_interface(chip->pm_intf); up_read(&chip->shutdown_rwsem); return err; } void snd_usb_autosuspend(struct snd_usb_audio *chip) { down_read(&chip->shutdown_rwsem); if (!chip->shutdown && !chip->probing) usb_autopm_put_interface(chip->pm_intf); up_read(&chip->shutdown_rwsem); } static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) { struct snd_usb_audio *chip = usb_get_intfdata(intf); 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_entry(as, &chip->pcm_list, list) { snd_pcm_suspend_all(as->pcm); as->substream[0].need_setup_ep = as->substream[1].need_setup_ep = true; } } } 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, }; module_usb_driver(usb_audio_driver);