From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- sound/usb/card.c | 771 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 771 insertions(+) create mode 100644 sound/usb/card.c (limited to 'sound/usb/card.c') diff --git a/sound/usb/card.c b/sound/usb/card.c new file mode 100644 index 000000000..1fab97788 --- /dev/null +++ b/sound/usb/card.c @@ -0,0 +1,771 @@ +/* + * (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 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); + 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 -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) { + dev_err(&dev->dev, "cannot find UAC_HEADER\n"); + return -EINVAL; + } + + 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 = control_header; + + if (!h1->bInCollection) { + dev_info(&dev->dev, "skipping empty audio interface (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: { + 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 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 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); + 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); +} + +/* + * 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, + 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: + 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, + 0, &card); + if (err < 0) { + dev_err(&dev->dev, "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)); + } + } + strim(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) { + 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; + 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 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 (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum) + return -ENXIO; + + err = snd_usb_apply_boot_quirk(dev, intf, quirk); + 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 (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]; + 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))) { + err = snd_usb_audio_create(intf, dev, i, quirk, + &chip); + if (err < 0) + goto __error; + chip->pm_intf = intf; + break; + } + if (!chip) { + dev_err(&dev->dev, "no available usb audio device\n"); + err = -ENODEV; + 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 */ + 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++; + chip->probing = 0; + usb_set_intfdata(intf, chip); + mutex_unlock(®ister_mutex); + return 0; + + __error: + if (chip) { + if (!chip->num_interfaces) + snd_card_free(chip->card); + chip->probing = 0; + } + 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; + bool was_shutdown; + + if (chip == (void *)-1L) + return; + + card = chip->card; + down_write(&chip->shutdown_rwsem); + was_shutdown = chip->shutdown; + chip->shutdown = 1; + up_write(&chip->shutdown_rwsem); + + mutex_lock(®ister_mutex); + if (!was_shutdown) { + struct snd_usb_stream *as; + struct snd_usb_endpoint *ep; + struct usb_mixer_interface *mixer; + + 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); + } +} + +#ifdef CONFIG_PM + +int snd_usb_autoresume(struct snd_usb_audio *chip) +{ + int err = -ENODEV; + + down_read(&chip->shutdown_rwsem); + if (chip->probing && chip->in_pm) + 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 && !chip->in_pm) + 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; + struct list_head *p; + + 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; + } + list_for_each(p, &chip->midi_list) { + snd_usbmidi_suspend(p); + } + } + } else { + /* + * otherwise we keep the rest of the system in the dark + * to keep this transparent + */ + if (!chip->num_suspended_intf++) + chip->autosuspended = 1; + } + + if (chip->num_suspended_intf == 1) + 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 usb_mixer_interface *mixer; + struct list_head *p; + int err = 0; + + if (chip == (void *)-1L) + return 0; + if (--chip->num_suspended_intf) + return 0; + + chip->in_pm = 1; + /* + * 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: + chip->in_pm = 0; + 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 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); -- cgit v1.2.3