| /* |
| * (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) |
| * |
| * Audio Class 3.0 support by Ruslan Bilovol <ruslan.bilovol@gmail.com> |
| * |
| * 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 <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/usb/audio-v3.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 device_setup[SNDRV_CARDS]; /* device parameter for this card */ |
| static bool ignore_ctl_error; |
| static bool autoclock = true; |
| static char *quirk_alias[SNDRV_CARDS]; |
| |
| bool snd_usb_use_vmalloc = 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)."); |
| module_param_array(quirk_alias, charp, NULL, 0444); |
| MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef."); |
| module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444); |
| MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (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 usb_audio_disconnect() |
| */ |
| static void snd_usb_stream_disconnect(struct snd_usb_stream *as) |
| { |
| int idx; |
| struct snd_usb_substream *subs; |
| |
| 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) { |
| dev_err(&dev->dev, "%u:%d : does not exist\n", |
| 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)) { |
| dev_dbg(&dev->dev, "%d:%d: skipping, already claimed\n", |
| 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, |
| chip->usb_id); |
| if (err < 0) { |
| dev_err(&dev->dev, |
| "%u:%d: cannot create sequencer device\n", |
| 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) { |
| dev_dbg(&dev->dev, |
| "%u:%d: skipping non-supported interface %d\n", |
| ctrlif, interface, altsd->bInterfaceClass); |
| /* skip non-supported classes */ |
| return -EINVAL; |
| } |
| |
| if (snd_usb_get_speed(dev) == USB_SPEED_LOW) { |
| dev_err(&dev->dev, "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 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; |
| int i, protocol; |
| |
| /* find audiocontrol interface */ |
| host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0]; |
| altsd = get_iface_desc(host_iface); |
| protocol = altsd->bInterfaceProtocol; |
| |
| switch (protocol) { |
| default: |
| dev_warn(&dev->dev, |
| "unknown interface protocol %#02x, assuming v1\n", |
| protocol); |
| /* fall through */ |
| |
| case UAC_VERSION_1: { |
| struct uac1_ac_header_descriptor *h1; |
| int rest_bytes; |
| |
| h1 = snd_usb_find_csint_desc(host_iface->extra, |
| host_iface->extralen, |
| NULL, UAC_HEADER); |
| if (!h1 || h1->bLength < sizeof(*h1)) { |
| dev_err(&dev->dev, "cannot find UAC_HEADER\n"); |
| return -EINVAL; |
| } |
| |
| rest_bytes = (void *)(host_iface->extra + |
| host_iface->extralen) - (void *)h1; |
| |
| /* just to be sure -- this shouldn't hit at all */ |
| if (rest_bytes <= 0) { |
| dev_err(&dev->dev, "invalid control header\n"); |
| return -EINVAL; |
| } |
| |
| if (rest_bytes < sizeof(*h1)) { |
| dev_err(&dev->dev, "too short v1 buffer descriptor\n"); |
| return -EINVAL; |
| } |
| |
| if (!h1->bInCollection) { |
| dev_info(&dev->dev, "skipping empty audio interface (v1)\n"); |
| return -EINVAL; |
| } |
| |
| if (rest_bytes < h1->bLength) { |
| dev_err(&dev->dev, "invalid buffer length (v1)\n"); |
| return -EINVAL; |
| } |
| |
| if (h1->bLength < sizeof(*h1) + h1->bInCollection) { |
| dev_err(&dev->dev, "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: |
| case UAC_VERSION_3: { |
| 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) { |
| dev_err(&dev->dev, "Audio class v2/v3 interfaces need an interface association\n"); |
| return -EINVAL; |
| } |
| |
| if (protocol == UAC_VERSION_3) { |
| int badd = assoc->bFunctionSubClass; |
| |
| if (badd != UAC3_FUNCTION_SUBCLASS_FULL_ADC_3_0 && |
| (badd < UAC3_FUNCTION_SUBCLASS_GENERIC_IO || |
| badd > UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE)) { |
| dev_err(&dev->dev, |
| "Unsupported UAC3 BADD profile\n"); |
| return -EINVAL; |
| } |
| |
| chip->badd_profile = badd; |
| } |
| |
| 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 void snd_usb_audio_free(struct snd_card *card) |
| { |
| struct snd_usb_audio *chip = card->private_data; |
| struct snd_usb_endpoint *ep, *n; |
| |
| list_for_each_entry_safe(ep, n, &chip->ep_list, list) |
| snd_usb_endpoint_free(ep); |
| |
| mutex_destroy(&chip->mutex); |
| if (!atomic_read(&chip->shutdown)) |
| dev_set_drvdata(&chip->dev->dev, NULL); |
| } |
| |
| static void usb_audio_make_shortname(struct usb_device *dev, |
| struct snd_usb_audio *chip, |
| const struct snd_usb_audio_quirk *quirk) |
| { |
| struct snd_card *card = chip->card; |
| |
| if (quirk && quirk->product_name && *quirk->product_name) { |
| strlcpy(card->shortname, quirk->product_name, |
| sizeof(card->shortname)); |
| return; |
| } |
| |
| /* retrieve the device string as shortname */ |
| 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)); |
| } |
| |
| strim(card->shortname); |
| } |
| |
| static void usb_audio_make_longname(struct usb_device *dev, |
| struct snd_usb_audio *chip, |
| const struct snd_usb_audio_quirk *quirk) |
| { |
| struct snd_card *card = chip->card; |
| int len; |
| |
| /* shortcut - if any pre-defined string is given, use it */ |
| if (quirk && quirk->profile_name && *quirk->profile_name) { |
| strlcpy(card->longname, quirk->profile_name, |
| sizeof(card->longname)); |
| return; |
| } |
| |
| if (quirk && quirk->vendor_name && *quirk->vendor_name) { |
| len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname)); |
| } else { |
| /* retrieve the vendor and device strings as longname */ |
| 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) { |
| strim(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; |
| case USB_SPEED_SUPER_PLUS: |
| strlcat(card->longname, ", super speed plus", sizeof(card->longname)); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* |
| * create a chip instance and set its names. |
| */ |
| static int snd_usb_audio_create(struct usb_interface *intf, |
| struct usb_device *dev, int idx, |
| const struct snd_usb_audio_quirk *quirk, |
| unsigned int usb_id, |
| struct snd_usb_audio **rchip) |
| { |
| struct snd_card *card; |
| struct snd_usb_audio *chip; |
| int err; |
| char component[14]; |
| |
| *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: |
| case USB_SPEED_SUPER_PLUS: |
| break; |
| default: |
| dev_err(&dev->dev, "unknown device speed %d\n", snd_usb_get_speed(dev)); |
| return -ENXIO; |
| } |
| |
| err = snd_card_new(&intf->dev, index[idx], id[idx], THIS_MODULE, |
| sizeof(*chip), &card); |
| if (err < 0) { |
| dev_err(&dev->dev, "cannot create card instance %d\n", idx); |
| return err; |
| } |
| |
| chip = card->private_data; |
| mutex_init(&chip->mutex); |
| init_waitqueue_head(&chip->shutdown_wait); |
| chip->index = idx; |
| chip->dev = dev; |
| chip->card = card; |
| chip->setup = device_setup[idx]; |
| chip->autoclock = autoclock; |
| atomic_set(&chip->active, 1); /* avoid autopm during probing */ |
| atomic_set(&chip->usage_count, 0); |
| atomic_set(&chip->shutdown, 0); |
| |
| chip->usb_id = usb_id; |
| INIT_LIST_HEAD(&chip->pcm_list); |
| INIT_LIST_HEAD(&chip->ep_list); |
| INIT_LIST_HEAD(&chip->midi_list); |
| INIT_LIST_HEAD(&chip->mixer_list); |
| |
| card->private_free = snd_usb_audio_free; |
| |
| 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); |
| |
| usb_audio_make_shortname(dev, chip, quirk); |
| usb_audio_make_longname(dev, chip, quirk); |
| |
| snd_usb_audio_create_proc(chip); |
| |
| *rchip = chip; |
| return 0; |
| } |
| |
| /* look for a matching quirk alias id */ |
| static bool get_alias_id(struct usb_device *dev, unsigned int *id) |
| { |
| int i; |
| unsigned int src, dst; |
| |
| for (i = 0; i < ARRAY_SIZE(quirk_alias); i++) { |
| if (!quirk_alias[i] || |
| sscanf(quirk_alias[i], "%x:%x", &src, &dst) != 2 || |
| src != *id) |
| continue; |
| dev_info(&dev->dev, |
| "device (%04x:%04x): applying quirk alias %04x:%04x\n", |
| USB_ID_VENDOR(*id), USB_ID_PRODUCT(*id), |
| USB_ID_VENDOR(dst), USB_ID_PRODUCT(dst)); |
| *id = dst; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static const struct usb_device_id usb_audio_ids[]; /* defined below */ |
| |
| /* look for the corresponding quirk */ |
| static const struct snd_usb_audio_quirk * |
| get_alias_quirk(struct usb_device *dev, unsigned int id) |
| { |
| const struct usb_device_id *p; |
| |
| for (p = usb_audio_ids; p->match_flags; p++) { |
| /* FIXME: this checks only vendor:product pair in the list */ |
| if ((p->match_flags & USB_DEVICE_ID_MATCH_DEVICE) == |
| USB_DEVICE_ID_MATCH_DEVICE && |
| p->idVendor == USB_ID_VENDOR(id) && |
| p->idProduct == USB_ID_PRODUCT(id)) |
| return (const struct snd_usb_audio_quirk *)p->driver_info; |
| } |
| |
| return NULL; |
| } |
| |
| /* |
| * 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 int usb_audio_probe(struct usb_interface *intf, |
| const struct usb_device_id *usb_id) |
| { |
| struct usb_device *dev = interface_to_usbdev(intf); |
| const struct snd_usb_audio_quirk *quirk = |
| (const struct snd_usb_audio_quirk *)usb_id->driver_info; |
| struct snd_usb_audio *chip; |
| int i, err; |
| 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 (get_alias_id(dev, &id)) |
| quirk = get_alias_quirk(dev, id); |
| if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) |
| return -ENXIO; |
| |
| err = snd_usb_apply_boot_quirk(dev, intf, quirk, id); |
| if (err < 0) |
| return err; |
| |
| /* |
| * 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 (atomic_read(&usb_chip[i]->shutdown)) { |
| dev_err(&dev->dev, "USB device is in the shutdown state, cannot create a card instance\n"); |
| err = -EIO; |
| goto __error; |
| } |
| chip = usb_chip[i]; |
| atomic_inc(&chip->active); /* avoid autopm */ |
| 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 (!usb_chip[i] && |
| (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) && |
| (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) { |
| if (enable[i]) { |
| err = snd_usb_audio_create(intf, dev, i, quirk, |
| id, &chip); |
| if (err < 0) |
| goto __error; |
| chip->pm_intf = intf; |
| break; |
| } else if (vid[i] != -1 || pid[i] != -1) { |
| dev_info(&dev->dev, |
| "device (%04x:%04x) is disabled\n", |
| USB_ID_VENDOR(id), |
| USB_ID_PRODUCT(id)); |
| err = -ENOENT; |
| goto __error; |
| } |
| } |
| if (!chip) { |
| dev_err(&dev->dev, "no available usb audio device\n"); |
| err = -ENODEV; |
| goto __error; |
| } |
| } |
| dev_set_drvdata(&dev->dev, chip); |
| |
| /* |
| * 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 */ |
| err = snd_usb_create_quirk(chip, intf, &usb_audio_driver, quirk); |
| if (err < 0) |
| goto __error; |
| } |
| |
| if (err > 0) { |
| /* create normal USB audio interfaces */ |
| err = snd_usb_create_streams(chip, ifnum); |
| if (err < 0) |
| goto __error; |
| err = snd_usb_create_mixer(chip, ifnum, ignore_ctl_error); |
| if (err < 0) |
| goto __error; |
| } |
| |
| /* we are allowed to call snd_card_register() many times */ |
| err = snd_card_register(chip->card); |
| if (err < 0) |
| goto __error; |
| |
| usb_chip[chip->index] = chip; |
| chip->num_interfaces++; |
| usb_set_intfdata(intf, chip); |
| atomic_dec(&chip->active); |
| mutex_unlock(®ister_mutex); |
| return 0; |
| |
| __error: |
| if (chip) { |
| /* chip->active is inside the chip->card object, |
| * decrement before memory is possibly returned. |
| */ |
| atomic_dec(&chip->active); |
| if (!chip->num_interfaces) |
| snd_card_free(chip->card); |
| } |
| mutex_unlock(®ister_mutex); |
| return err; |
| } |
| |
| /* |
| * we need to take care of counter, since disconnection can be called also |
| * many times as well as usb_audio_probe(). |
| */ |
| static void usb_audio_disconnect(struct usb_interface *intf) |
| { |
| struct snd_usb_audio *chip = usb_get_intfdata(intf); |
| struct snd_card *card; |
| struct list_head *p; |
| |
| if (chip == (void *)-1L) |
| return; |
| |
| card = chip->card; |
| |
| mutex_lock(®ister_mutex); |
| if (atomic_inc_return(&chip->shutdown) == 1) { |
| struct snd_usb_stream *as; |
| struct snd_usb_endpoint *ep; |
| struct usb_mixer_interface *mixer; |
| |
| /* wait until all pending tasks done; |
| * they are protected by snd_usb_lock_shutdown() |
| */ |
| wait_event(chip->shutdown_wait, |
| !atomic_read(&chip->usage_count)); |
| snd_card_disconnect(card); |
| /* release the pcm resources */ |
| list_for_each_entry(as, &chip->pcm_list, list) { |
| snd_usb_stream_disconnect(as); |
| } |
| /* 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_entry(mixer, &chip->mixer_list, list) { |
| snd_usb_mixer_disconnect(mixer); |
| } |
| } |
| |
| chip->num_interfaces--; |
| if (chip->num_interfaces <= 0) { |
| usb_chip[chip->index] = NULL; |
| mutex_unlock(®ister_mutex); |
| snd_card_free_when_closed(card); |
| } else { |
| mutex_unlock(®ister_mutex); |
| } |
| } |
| |
| /* lock the shutdown (disconnect) task and autoresume */ |
| int snd_usb_lock_shutdown(struct snd_usb_audio *chip) |
| { |
| int err; |
| |
| atomic_inc(&chip->usage_count); |
| if (atomic_read(&chip->shutdown)) { |
| err = -EIO; |
| goto error; |
| } |
| err = snd_usb_autoresume(chip); |
| if (err < 0) |
| goto error; |
| return 0; |
| |
| error: |
| if (atomic_dec_and_test(&chip->usage_count)) |
| wake_up(&chip->shutdown_wait); |
| return err; |
| } |
| |
| /* autosuspend and unlock the shutdown */ |
| void snd_usb_unlock_shutdown(struct snd_usb_audio *chip) |
| { |
| snd_usb_autosuspend(chip); |
| if (atomic_dec_and_test(&chip->usage_count)) |
| wake_up(&chip->shutdown_wait); |
| } |
| |
| #ifdef CONFIG_PM |
| |
| int snd_usb_autoresume(struct snd_usb_audio *chip) |
| { |
| if (atomic_read(&chip->shutdown)) |
| return -EIO; |
| if (atomic_inc_return(&chip->active) == 1) |
| return usb_autopm_get_interface(chip->pm_intf); |
| return 0; |
| } |
| |
| void snd_usb_autosuspend(struct snd_usb_audio *chip) |
| { |
| if (atomic_read(&chip->shutdown)) |
| return; |
| if (atomic_dec_and_test(&chip->active)) |
| 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 snd_usb_stream *as; |
| struct usb_mixer_interface *mixer; |
| struct list_head *p; |
| |
| if (chip == (void *)-1L) |
| return 0; |
| |
| chip->autosuspended = !!PMSG_IS_AUTO(message); |
| if (!chip->autosuspended) |
| 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_usb_pcm_suspend(as); |
| as->substream[0].need_setup_ep = |
| as->substream[1].need_setup_ep = true; |
| } |
| list_for_each(p, &chip->midi_list) |
| snd_usbmidi_suspend(p); |
| list_for_each_entry(mixer, &chip->mixer_list, list) |
| snd_usb_mixer_suspend(mixer); |
| } |
| |
| return 0; |
| } |
| |
| static int __usb_audio_resume(struct usb_interface *intf, bool reset_resume) |
| { |
| struct snd_usb_audio *chip = usb_get_intfdata(intf); |
| struct snd_usb_stream *as; |
| struct usb_mixer_interface *mixer; |
| struct list_head *p; |
| int err = 0; |
| |
| if (chip == (void *)-1L) |
| return 0; |
| if (--chip->num_suspended_intf) |
| return 0; |
| |
| atomic_inc(&chip->active); /* avoid autopm */ |
| |
| list_for_each_entry(as, &chip->pcm_list, list) { |
| err = snd_usb_pcm_resume(as); |
| if (err < 0) |
| goto err_out; |
| } |
| |
| /* |
| * 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_resume(mixer, reset_resume); |
| if (err < 0) |
| goto err_out; |
| } |
| |
| list_for_each(p, &chip->midi_list) { |
| snd_usbmidi_resume(p); |
| } |
| |
| if (!chip->autosuspended) |
| snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); |
| chip->autosuspended = 0; |
| |
| err_out: |
| atomic_dec(&chip->active); /* allow autopm after this point */ |
| return err; |
| } |
| |
| static int usb_audio_resume(struct usb_interface *intf) |
| { |
| return __usb_audio_resume(intf, false); |
| } |
| |
| static int usb_audio_reset_resume(struct usb_interface *intf) |
| { |
| return __usb_audio_resume(intf, true); |
| } |
| #else |
| #define usb_audio_suspend NULL |
| #define usb_audio_resume NULL |
| #define usb_audio_reset_resume NULL |
| #endif /* CONFIG_PM */ |
| |
| static const 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, |
| .reset_resume = usb_audio_reset_resume, |
| .id_table = usb_audio_ids, |
| .supports_autosuspend = 1, |
| }; |
| |
| module_usb_driver(usb_audio_driver); |