linux/sound/pci/hda/hda_bind.c

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/*
* HD-audio codec driver binding
* Copyright (c) Takashi Iwai <tiwai@suse.de>
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
/* codec vendor labels */
struct hda_vendor_id {
unsigned int id;
const char *name;
};
static struct hda_vendor_id hda_vendor_ids[] = {
{ 0x1002, "ATI" },
{ 0x1013, "Cirrus Logic" },
{ 0x1057, "Motorola" },
{ 0x1095, "Silicon Image" },
{ 0x10de, "Nvidia" },
{ 0x10ec, "Realtek" },
{ 0x1102, "Creative" },
{ 0x1106, "VIA" },
{ 0x111d, "IDT" },
{ 0x11c1, "LSI" },
{ 0x11d4, "Analog Devices" },
{ 0x13f6, "C-Media" },
{ 0x14f1, "Conexant" },
{ 0x17e8, "Chrontel" },
{ 0x1854, "LG" },
{ 0x1aec, "Wolfson Microelectronics" },
{ 0x1af4, "QEMU" },
{ 0x434d, "C-Media" },
{ 0x8086, "Intel" },
{ 0x8384, "SigmaTel" },
{} /* terminator */
};
/*
* find a matching codec preset
*/
static int hda_bus_match(struct device *dev, struct device_driver *drv)
{
struct hda_codec *codec = container_of(dev, struct hda_codec, dev);
struct hda_codec_driver *driver =
container_of(drv, struct hda_codec_driver, driver);
const struct hda_codec_preset *preset;
/* check probe_id instead of vendor_id if set */
u32 id = codec->probe_id ? codec->probe_id : codec->vendor_id;
for (preset = driver->preset; preset->id; preset++) {
u32 mask = preset->mask;
if (preset->afg && preset->afg != codec->afg)
continue;
if (preset->mfg && preset->mfg != codec->mfg)
continue;
if (!mask)
mask = ~0;
if (preset->id == (id & mask) &&
(!preset->rev || preset->rev == codec->revision_id)) {
codec->preset = preset;
return 1;
}
}
return 0;
}
/* reset the codec name from the preset */
static int codec_refresh_name(struct hda_codec *codec, const char *name)
{
char tmp[16];
kfree(codec->chip_name);
if (!name) {
sprintf(tmp, "ID %x", codec->vendor_id & 0xffff);
name = tmp;
}
codec->chip_name = kstrdup(name, GFP_KERNEL);
return codec->chip_name ? 0 : -ENOMEM;
}
static int hda_codec_driver_probe(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
struct module *owner = dev->driver->owner;
int err;
if (WARN_ON(!codec->preset))
return -EINVAL;
err = codec_refresh_name(codec, codec->preset->name);
if (err < 0)
goto error;
if (!try_module_get(owner)) {
err = -EINVAL;
goto error;
}
err = codec->preset->patch(codec);
if (err < 0) {
module_put(owner);
goto error;
}
return 0;
error:
codec->preset = NULL;
memset(&codec->patch_ops, 0, sizeof(codec->patch_ops));
return err;
}
static int hda_codec_driver_remove(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
snd_hda_codec_cleanup_for_unbind(codec);
module_put(dev->driver->owner);
return 0;
}
int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
struct module *owner)
{
drv->driver.name = name;
drv->driver.owner = owner;
drv->driver.bus = &snd_hda_bus_type;
drv->driver.probe = hda_codec_driver_probe;
drv->driver.remove = hda_codec_driver_remove;
drv->driver.pm = &hda_codec_driver_pm;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
void hda_codec_driver_unregister(struct hda_codec_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
static inline bool codec_probed(struct hda_codec *codec)
{
return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
}
/* try to auto-load and bind the codec module */
static void codec_bind_module(struct hda_codec *codec)
{
#ifdef MODULE
request_module("snd-hda-codec-id:%08x", codec->vendor_id);
if (codec_probed(codec))
return;
request_module("snd-hda-codec-id:%04x*",
(codec->vendor_id >> 16) & 0xffff);
if (codec_probed(codec))
return;
#endif
}
/* store the codec vendor name */
static int get_codec_vendor_name(struct hda_codec *codec)
{
const struct hda_vendor_id *c;
const char *vendor = NULL;
u16 vendor_id = codec->vendor_id >> 16;
char tmp[16];
for (c = hda_vendor_ids; c->id; c++) {
if (c->id == vendor_id) {
vendor = c->name;
break;
}
}
if (!vendor) {
sprintf(tmp, "Generic %04x", vendor_id);
vendor = tmp;
}
codec->vendor_name = kstrdup(vendor, GFP_KERNEL);
if (!codec->vendor_name)
return -ENOMEM;
return 0;
}
#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
/* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
static bool is_likely_hdmi_codec(struct hda_codec *codec)
{
hda_nid_t nid = codec->start_nid;
int i;
for (i = 0; i < codec->num_nodes; i++, nid++) {
unsigned int wcaps = get_wcaps(codec, nid);
switch (get_wcaps_type(wcaps)) {
case AC_WID_AUD_IN:
return false; /* HDMI parser supports only HDMI out */
case AC_WID_AUD_OUT:
if (!(wcaps & AC_WCAP_DIGITAL))
return false;
break;
}
}
return true;
}
#else
/* no HDMI codec parser support */
#define is_likely_hdmi_codec(codec) false
#endif /* CONFIG_SND_HDA_CODEC_HDMI */
static int codec_bind_generic(struct hda_codec *codec)
{
if (codec->probe_id)
return -ENODEV;
if (is_likely_hdmi_codec(codec)) {
codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
request_module("snd-hda-codec-hdmi");
#endif
if (codec_probed(codec))
return 0;
}
codec->probe_id = HDA_CODEC_ID_GENERIC;
#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
request_module("snd-hda-codec-generic");
#endif
if (codec_probed(codec))
return 0;
return -ENODEV;
}
#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
#define is_generic_config(codec) \
(codec->modelname && !strcmp(codec->modelname, "generic"))
#else
#define is_generic_config(codec) 0
#endif
/**
* snd_hda_codec_configure - (Re-)configure the HD-audio codec
* @codec: the HDA codec
*
* Start parsing of the given codec tree and (re-)initialize the whole
* patch instance.
*
* Returns 0 if successful or a negative error code.
*/
int snd_hda_codec_configure(struct hda_codec *codec)
{
int err;
if (!codec->vendor_name) {
err = get_codec_vendor_name(codec);
if (err < 0)
return err;
}
if (is_generic_config(codec))
codec->probe_id = HDA_CODEC_ID_GENERIC;
else
codec->probe_id = 0;
err = device_add(hda_codec_dev(codec));
if (err < 0)
return err;
if (!codec->preset)
codec_bind_module(codec);
if (!codec->preset) {
err = codec_bind_generic(codec);
if (err < 0) {
codec_err(codec, "Unable to bind the codec\n");
goto error;
}
}
/* audio codec should override the mixer name */
if (codec->afg || !*codec->card->mixername)
snprintf(codec->card->mixername,
sizeof(codec->card->mixername),
"%s %s", codec->vendor_name, codec->chip_name);
return 0;
error:
device_del(hda_codec_dev(codec));
return err;
}
EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
/*
* bus registration
*/
struct bus_type snd_hda_bus_type = {
.name = "hdaudio",
.match = hda_bus_match,
};
static int __init hda_codec_init(void)
{
return bus_register(&snd_hda_bus_type);
}
static void __exit hda_codec_exit(void)
{
bus_unregister(&snd_hda_bus_type);
}
module_init(hda_codec_init);
module_exit(hda_codec_exit);