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/*
* (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 <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 "urb.h"
#include "format.h"
#include "power.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 int 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 int async_unlink = 1;
static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
static int 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_endpoints(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) {
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 void *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(&register_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(&register_mutex);
return chip;
__error:
if (chip) {
if (!chip->num_interfaces)
snd_card_free(chip->card);
chip->probing = 0;
}
mutex_unlock(&register_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(&register_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(&register_mutex);
snd_card_free_when_closed(card);
} else {
mutex_unlock(&chip->shutdown_mutex);
mutex_unlock(&register_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);
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