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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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 <sound/hda_codec.h>
#include "hda_local.h"
#include "hda_jack.h"
/*
* find a matching codec id
*/
static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
{
struct hda_codec *codec = container_of(dev, struct hda_codec, core);
struct hda_codec_driver *driver =
container_of(drv, struct hda_codec_driver, core);
const struct hda_device_id *list;
/* check probe_id instead of vendor_id if set */
u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
u32 rev_id = codec->core.revision_id;
for (list = driver->id; list->vendor_id; list++) {
if (list->vendor_id == id &&
(!list->rev_id || list->rev_id == rev_id)) {
codec->preset = list;
return 1;
}
}
return 0;
}
/* process an unsolicited event */
static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
{
struct hda_codec *codec = container_of(dev, struct hda_codec, core);
/* ignore unsol events during shutdown */
if (codec->bus->shutdown)
return;
/* ignore unsol events during system suspend/resume */
if (codec->core.dev.power.power_state.event != PM_EVENT_ON)
return;
if (codec->patch_ops.unsol_event)
codec->patch_ops.unsol_event(codec, ev);
}
/**
* snd_hda_codec_set_name - set the codec name
* @codec: the HDA codec
* @name: name string to set
*/
int snd_hda_codec_set_name(struct hda_codec *codec, const char *name)
{
int err;
if (!name)
return 0;
err = snd_hdac_device_set_chip_name(&codec->core, name);
if (err < 0)
return err;
/* update the mixer name */
if (!*codec->card->mixername ||
codec->bus->mixer_assigned >= codec->core.addr) {
snprintf(codec->card->mixername,
sizeof(codec->card->mixername), "%s %s",
codec->core.vendor_name, codec->core.chip_name);
codec->bus->mixer_assigned = codec->core.addr;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_hda_codec_set_name);
static int hda_codec_driver_probe(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
struct module *owner = dev->driver->owner;
hda_codec_patch_t patch;
int err;
if (codec->bus->core.ext_ops) {
if (WARN_ON(!codec->bus->core.ext_ops->hdev_attach))
return -EINVAL;
return codec->bus->core.ext_ops->hdev_attach(&codec->core);
}
if (WARN_ON(!codec->preset))
return -EINVAL;
err = snd_hda_codec_set_name(codec, codec->preset->name);
if (err < 0)
goto error;
err = snd_hdac_regmap_init(&codec->core);
if (err < 0)
goto error;
if (!try_module_get(owner)) {
err = -EINVAL;
goto error;
}
patch = (hda_codec_patch_t)codec->preset->driver_data;
if (patch) {
err = patch(codec);
if (err < 0)
goto error_module_put;
}
err = snd_hda_codec_build_pcms(codec);
if (err < 0)
goto error_module;
err = snd_hda_codec_build_controls(codec);
if (err < 0)
goto error_module;
/* only register after the bus probe finished; otherwise it's racy */
if (!codec->bus->bus_probing && codec->card->registered) {
err = snd_card_register(codec->card);
if (err < 0)
goto error_module;
snd_hda_codec_register(codec);
}
codec->core.lazy_cache = true;
return 0;
error_module:
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
error_module_put:
module_put(owner);
error:
snd_hda_codec_cleanup_for_unbind(codec);
codec->preset = NULL;
return err;
}
static int hda_codec_driver_remove(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
if (codec->bus->core.ext_ops) {
if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach))
return -EINVAL;
return codec->bus->core.ext_ops->hdev_detach(&codec->core);
}
snd_hda_codec_disconnect_pcms(codec);
snd_hda_jack_tbl_disconnect(codec);
if (!refcount_dec_and_test(&codec->pcm_ref))
wait_event(codec->remove_sleep, !refcount_read(&codec->pcm_ref));
snd_power_sync_ref(codec->bus->card);
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
snd_hda_codec_cleanup_for_unbind(codec);
codec->preset = NULL;
module_put(dev->driver->owner);
return 0;
}
static void hda_codec_driver_shutdown(struct device *dev)
{
snd_hda_codec_shutdown(dev_to_hda_codec(dev));
}
int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
struct module *owner)
{
drv->core.driver.name = name;
drv->core.driver.owner = owner;
drv->core.driver.bus = &snd_hda_bus_type;
drv->core.driver.probe = hda_codec_driver_probe;
drv->core.driver.remove = hda_codec_driver_remove;
drv->core.driver.shutdown = hda_codec_driver_shutdown;
drv->core.driver.pm = &hda_codec_driver_pm;
drv->core.type = HDA_DEV_LEGACY;
drv->core.match = hda_codec_match;
drv->core.unsol_event = hda_codec_unsol_event;
return driver_register(&drv->core.driver);
}
EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
void hda_codec_driver_unregister(struct hda_codec_driver *drv)
{
driver_unregister(&drv->core.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 codec module */
static void request_codec_module(struct hda_codec *codec)
{
#ifdef MODULE
char modalias[32];
const char *mod = NULL;
switch (codec->probe_id) {
case HDA_CODEC_ID_GENERIC_HDMI:
#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
mod = "snd-hda-codec-hdmi";
#endif
break;
case HDA_CODEC_ID_GENERIC:
#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
mod = "snd-hda-codec-generic";
#endif
break;
default:
snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias));
mod = modalias;
break;
}
if (mod)
request_module(mod);
#endif /* MODULE */
}
/* try to auto-load and bind the codec module */
static void codec_bind_module(struct hda_codec *codec)
{
#ifdef MODULE
request_codec_module(codec);
if (codec_probed(codec))
return;
#endif
}
#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;
/*
* For ASoC users, if snd_hda_hdmi_codec module is denylisted and any
* event causes i915 enumeration to fail, ->wcaps remains uninitialized.
*/
if (!codec->wcaps)
return true;
for_each_hda_codec_node(nid, codec) {
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;
request_codec_module(codec);
if (codec_probed(codec))
return 0;
}
codec->probe_id = HDA_CODEC_ID_GENERIC;
request_codec_module(codec);
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->configured)
return 0;
if (is_generic_config(codec))
codec->probe_id = HDA_CODEC_ID_GENERIC;
else
codec->probe_id = 0;
if (!device_is_registered(&codec->core.dev)) {
err = snd_hdac_device_register(&codec->core);
if (err < 0)
return err;
}
if (!codec->preset)
codec_bind_module(codec);
if (!codec->preset) {
err = codec_bind_generic(codec);
if (err < 0) {
codec_dbg(codec, "Unable to bind the codec\n");
return err;
}
}
codec->configured = 1;
return 0;
}
EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
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