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linux/sound/usb/card.c
Takashi Iwai c11117b634 ALSA: usb-audio: Refcount multiple accesses on the single clock 
When a clock source is connected to multiple nodes / endpoints, the
current USB-audio driver tries to set up at each time one of them is
configured.  Although it reads the current rate and updates only if it
differs, some devices seem unhappy with this behavior and spew the
errors when reading/updating the rate unnecessarily.

This patch tries to reduce the redundant clock setup by introducing a
refcount for each clock source.  When the stream is actually running,
a clock rate is "locked", and it bypasses the clock and/or refuse to
change any longer.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215934
Link: https://lore.kernel.org/r/20220516104807.16482-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-05-16 12:49:03 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (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>
*
* 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 "pcm.h"
#include "format.h"
#include "power.h"
#include "stream.h"
#include "media.h"
MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("USB Audio");
MODULE_LICENSE("GPL");
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 bool lowlatency = true;
static char *quirk_alias[SNDRV_CARDS];
static char *delayed_register[SNDRV_CARDS];
static bool implicit_fb[SNDRV_CARDS];
static unsigned int quirk_flags[SNDRV_CARDS];
bool snd_usb_use_vmalloc = true;
bool snd_usb_skip_validation;
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(lowlatency, bool, 0444);
MODULE_PARM_DESC(lowlatency, "Enable low latency playback (default: yes).");
module_param_array(quirk_alias, charp, NULL, 0444);
MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
module_param_array(delayed_register, charp, NULL, 0444);
MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
module_param_array(implicit_fb, bool, NULL, 0444);
MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
module_param_array(quirk_flags, uint, NULL, 0444);
MODULE_PARM_DESC(quirk_flags, "Driver quirk bit flags.");
module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
MODULE_PARM_DESC(skip_validation, "Skip unit descriptor validation (default: no).");
/*
* 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->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;
}
return usb_driver_claim_interface(&usb_audio_driver, iface,
USB_AUDIO_IFACE_UNUSED);
}
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 */
return usb_driver_claim_interface(&usb_audio_driver, iface,
USB_AUDIO_IFACE_UNUSED);
}
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);
fallthrough;
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;
}
/*
* Profile name preset table
*/
struct usb_audio_device_name {
u32 id;
const char *vendor_name;
const char *product_name;
const char *profile_name; /* override card->longname */
};
#define PROFILE_NAME(vid, pid, vendor, product, profile) \
{ .id = USB_ID(vid, pid), .vendor_name = (vendor), \
.product_name = (product), .profile_name = (profile) }
#define DEVICE_NAME(vid, pid, vendor, product) \
PROFILE_NAME(vid, pid, vendor, product, NULL)
/* vendor/product and profile name presets, sorted in device id order */
static const struct usb_audio_device_name usb_audio_names[] = {
/* HP Thunderbolt Dock Audio Headset */
PROFILE_NAME(0x03f0, 0x0269, "HP", "Thunderbolt Dock Audio Headset",
"HP-Thunderbolt-Dock-Audio-Headset"),
/* HP Thunderbolt Dock Audio Module */
PROFILE_NAME(0x03f0, 0x0567, "HP", "Thunderbolt Dock Audio Module",
"HP-Thunderbolt-Dock-Audio-Module"),
/* Two entries for Gigabyte TRX40 Aorus Master:
* TRX40 Aorus Master has two USB-audio devices, one for the front
* headphone with ESS SABRE9218 DAC chip, while another for the rest
* I/O (the rear panel and the front mic) with Realtek ALC1220-VB.
* Here we provide two distinct names for making UCM profiles easier.
*/
PROFILE_NAME(0x0414, 0xa000, "Gigabyte", "Aorus Master Front Headphone",
"Gigabyte-Aorus-Master-Front-Headphone"),
PROFILE_NAME(0x0414, 0xa001, "Gigabyte", "Aorus Master Main Audio",
"Gigabyte-Aorus-Master-Main-Audio"),
/* Gigabyte TRX40 Aorus Pro WiFi */
PROFILE_NAME(0x0414, 0xa002,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
/* Creative/E-Mu devices */
DEVICE_NAME(0x041e, 0x3010, "Creative Labs", "Sound Blaster MP3+"),
/* Creative/Toshiba Multimedia Center SB-0500 */
DEVICE_NAME(0x041e, 0x3048, "Toshiba", "SB-0500"),
DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
DEVICE_NAME(0x05e1, 0x0408, "Syntek", "STK1160"),
DEVICE_NAME(0x05e1, 0x0480, "Hauppauge", "Woodbury"),
/* ASUS ROG Strix */
PROFILE_NAME(0x0b05, 0x1917,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
/* ASUS PRIME TRX40 PRO-S */
PROFILE_NAME(0x0b05, 0x1918,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
/* Dell WD15 Dock */
PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
/* Dell WD19 Dock */
PROFILE_NAME(0x0bda, 0x402e, "Dell", "WD19 Dock", "Dell-WD15-Dock"),
DEVICE_NAME(0x0ccd, 0x0028, "TerraTec", "Aureon5.1MkII"),
/*
* The original product_name is "USB Sound Device", however this name
* is also used by the CM106 based cards, so make it unique.
*/
DEVICE_NAME(0x0d8c, 0x0102, NULL, "ICUSBAUDIO7D"),
DEVICE_NAME(0x0d8c, 0x0103, NULL, "Audio Advantage MicroII"),
/* MSI TRX40 Creator */
PROFILE_NAME(0x0db0, 0x0d64,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
/* MSI TRX40 */
PROFILE_NAME(0x0db0, 0x543d,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
DEVICE_NAME(0x0fd9, 0x0008, "Hauppauge", "HVR-950Q"),
/* Stanton/N2IT Final Scratch v1 device ('Scratchamp') */
DEVICE_NAME(0x103d, 0x0100, "Stanton", "ScratchAmp"),
DEVICE_NAME(0x103d, 0x0101, "Stanton", "ScratchAmp"),
/* aka. Serato Scratch Live DJ Box */
DEVICE_NAME(0x13e5, 0x0001, "Rane", "SL-1"),
/* Lenovo ThinkStation P620 Rear Line-in, Line-out and Microphone */
PROFILE_NAME(0x17aa, 0x1046, "Lenovo", "ThinkStation P620 Rear",
"Lenovo-ThinkStation-P620-Rear"),
/* Lenovo ThinkStation P620 Internal Speaker + Front Headset */
PROFILE_NAME(0x17aa, 0x104d, "Lenovo", "ThinkStation P620 Main",
"Lenovo-ThinkStation-P620-Main"),
/* Asrock TRX40 Creator */
PROFILE_NAME(0x26ce, 0x0a01,
"Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
DEVICE_NAME(0x2040, 0x7200, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7201, "Hauppauge", "HVR-950Q-MXL"),
DEVICE_NAME(0x2040, 0x7210, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7211, "Hauppauge", "HVR-950Q-MXL"),
DEVICE_NAME(0x2040, 0x7213, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7217, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x721b, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x721e, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x721f, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7240, "Hauppauge", "HVR-850"),
DEVICE_NAME(0x2040, 0x7260, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7280, "Hauppauge", "HVR-950Q"),
DEVICE_NAME(0x2040, 0x7281, "Hauppauge", "HVR-950Q-MXL"),
DEVICE_NAME(0x2040, 0x8200, "Hauppauge", "Woodbury"),
{ } /* terminator */
};
static const struct usb_audio_device_name *
lookup_device_name(u32 id)
{
static const struct usb_audio_device_name *p;
for (p = usb_audio_names; p->id; p++)
if (p->id == id)
return p;
return NULL;
}
/*
* 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;
snd_usb_endpoint_free_all(chip);
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;
const struct usb_audio_device_name *preset;
const char *s = NULL;
preset = lookup_device_name(chip->usb_id);
if (preset && preset->product_name)
s = preset->product_name;
else if (quirk && quirk->product_name)
s = quirk->product_name;
if (s && *s) {
strscpy(card->shortname, s, 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;
const struct usb_audio_device_name *preset;
const char *s = NULL;
int len;
preset = lookup_device_name(chip->usb_id);
/* shortcut - if any pre-defined string is given, use it */
if (preset && preset->profile_name)
s = preset->profile_name;
if (s && *s) {
strscpy(card->longname, s, sizeof(card->longname));
return;
}
if (preset && preset->vendor_name)
s = preset->vendor_name;
else if (quirk && quirk->vendor_name)
s = quirk->vendor_name;
*card->longname = 0;
if (s && *s) {
strscpy(card->longname, s, sizeof(card->longname));
} else {
/* retrieve the vendor and device strings as longname */
if (dev->descriptor.iManufacturer)
usb_string(dev, dev->descriptor.iManufacturer,
card->longname, sizeof(card->longname));
/* we don't really care if there isn't any vendor string */
}
if (*card->longname) {
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->generic_implicit_fb = implicit_fb[idx];
chip->autoclock = autoclock;
chip->lowlatency = lowlatency;
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->iface_ref_list);
INIT_LIST_HEAD(&chip->clock_ref_list);
INIT_LIST_HEAD(&chip->midi_list);
INIT_LIST_HEAD(&chip->mixer_list);
if (quirk_flags[idx])
chip->quirk_flags = quirk_flags[idx];
else
snd_usb_init_quirk_flags(chip);
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 bool check_delayed_register_option(struct snd_usb_audio *chip, int iface)
{
int i;
unsigned int id, inum;
for (i = 0; i < ARRAY_SIZE(delayed_register); i++) {
if (delayed_register[i] &&
sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
id == chip->usb_id)
return inum != iface;
}
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;
if (quirk && quirk->ifnum == QUIRK_NODEV_INTERFACE)
return -ENODEV;
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(&register_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) {
err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
if (err < 0)
goto __error;
/* 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;
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;
}
}
if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
dev_info(&dev->dev, "Too many interfaces assigned to the single USB-audio card\n");
err = -EINVAL;
goto __error;
}
dev_set_drvdata(&dev->dev, chip);
if (ignore_ctl_error)
chip->quirk_flags |= QUIRK_FLAG_IGNORE_CTL_ERROR;
if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
usb_disable_autosuspend(interface_to_usbdev(intf));
/*
* 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;
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);
if (err < 0)
goto __error;
}
if (chip->need_delayed_register) {
dev_info(&dev->dev,
"Found post-registration device assignment: %08x:%02x\n",
chip->usb_id, ifnum);
chip->need_delayed_register = false; /* clear again */
}
/* we are allowed to call snd_card_register() many times, but first
* check to see if a device needs to skip it or do anything special
*/
if (!snd_usb_registration_quirk(chip, ifnum) &&
!check_delayed_register_option(chip, ifnum)) {
err = snd_card_register(chip->card);
if (err < 0)
goto __error;
}
if (chip->quirk_flags & QUIRK_FLAG_SHARE_MEDIA_DEVICE) {
/* don't want to fail when snd_media_device_create() fails */
snd_media_device_create(chip, intf);
}
if (quirk)
chip->quirk_type = quirk->type;
usb_chip[chip->index] = chip;
chip->intf[chip->num_interfaces] = intf;
chip->num_interfaces++;
usb_set_intfdata(intf, chip);
atomic_dec(&chip->active);
mutex_unlock(&register_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(&register_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 == USB_AUDIO_IFACE_UNUSED)
return;
card = chip->card;
mutex_lock(&register_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);
}
/*
* Nice to check quirk && quirk->shares_media_device and
* then call the snd_media_device_delete(). Don't have
* access to the quirk here. snd_media_device_delete()
* accesses mixer_list
*/
snd_media_device_delete(chip);
/* release mixer resources */
list_for_each_entry(mixer, &chip->mixer_list, list) {
snd_usb_mixer_disconnect(mixer);
}
}
if (chip->quirk_flags & QUIRK_FLAG_DISABLE_AUTOSUSPEND)
usb_enable_autosuspend(interface_to_usbdev(intf));
chip->num_interfaces--;
if (chip->num_interfaces <= 0) {
usb_chip[chip->index] = NULL;
mutex_unlock(&register_mutex);
snd_card_free_when_closed(card);
} else {
mutex_unlock(&register_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);
}
int snd_usb_autoresume(struct snd_usb_audio *chip)
{
int i, err;
if (atomic_read(&chip->shutdown))
return -EIO;
if (atomic_inc_return(&chip->active) != 1)
return 0;
for (i = 0; i < chip->num_interfaces; i++) {
err = usb_autopm_get_interface(chip->intf[i]);
if (err < 0) {
/* rollback */
while (--i >= 0)
usb_autopm_put_interface(chip->intf[i]);
atomic_dec(&chip->active);
return err;
}
}
return 0;
}
void snd_usb_autosuspend(struct snd_usb_audio *chip)
{
int i;
if (atomic_read(&chip->shutdown))
return;
if (!atomic_dec_and_test(&chip->active))
return;
for (i = 0; i < chip->num_interfaces; i++)
usb_autopm_put_interface(chip->intf[i]);
}
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 snd_usb_endpoint *ep;
struct usb_mixer_interface *mixer;
struct list_head *p;
if (chip == USB_AUDIO_IFACE_UNUSED)
return 0;
if (!chip->num_suspended_intf++) {
list_for_each_entry(as, &chip->pcm_list, list)
snd_usb_pcm_suspend(as);
list_for_each_entry(ep, &chip->ep_list, list)
snd_usb_endpoint_suspend(ep);
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);
}
if (!PMSG_IS_AUTO(message) && !chip->system_suspend) {
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
chip->system_suspend = chip->num_suspended_intf;
}
return 0;
}
static int usb_audio_resume(struct usb_interface *intf)
{
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 == USB_AUDIO_IFACE_UNUSED)
return 0;
atomic_inc(&chip->active); /* avoid autopm */
if (chip->num_suspended_intf > 1)
goto out;
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);
if (err < 0)
goto err_out;
}
list_for_each(p, &chip->midi_list) {
snd_usbmidi_resume(p);
}
out:
if (chip->num_suspended_intf == chip->system_suspend) {
snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
chip->system_suspend = 0;
}
chip->num_suspended_intf--;
err_out:
atomic_dec(&chip->active); /* allow autopm after this point */
return err;
}
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_resume,
.id_table = usb_audio_ids,
.supports_autosuspend = 1,
};
module_usb_driver(usb_audio_driver);
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