345 lines
8.2 KiB
C
345 lines
8.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* HD-audio codec driver binding
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* Copyright (c) Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <sound/core.h>
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#include <sound/hda_codec.h>
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#include "hda_local.h"
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#include "hda_jack.h"
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/*
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* find a matching codec id
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*/
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static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
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{
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struct hda_codec *codec = container_of(dev, struct hda_codec, core);
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struct hda_codec_driver *driver =
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container_of(drv, struct hda_codec_driver, core);
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const struct hda_device_id *list;
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/* check probe_id instead of vendor_id if set */
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u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
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u32 rev_id = codec->core.revision_id;
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for (list = driver->id; list->vendor_id; list++) {
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if (list->vendor_id == id &&
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(!list->rev_id || list->rev_id == rev_id)) {
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codec->preset = list;
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return 1;
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}
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}
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return 0;
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}
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/* process an unsolicited event */
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static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
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{
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struct hda_codec *codec = container_of(dev, struct hda_codec, core);
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/* ignore unsol events during shutdown */
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if (codec->bus->shutdown)
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return;
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/* ignore unsol events during system suspend/resume */
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if (codec->core.dev.power.power_state.event != PM_EVENT_ON)
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return;
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if (codec->patch_ops.unsol_event)
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codec->patch_ops.unsol_event(codec, ev);
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}
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/**
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* snd_hda_codec_set_name - set the codec name
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* @codec: the HDA codec
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* @name: name string to set
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*/
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int snd_hda_codec_set_name(struct hda_codec *codec, const char *name)
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{
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int err;
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if (!name)
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return 0;
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err = snd_hdac_device_set_chip_name(&codec->core, name);
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if (err < 0)
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return err;
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/* update the mixer name */
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if (!*codec->card->mixername ||
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codec->bus->mixer_assigned >= codec->core.addr) {
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snprintf(codec->card->mixername,
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sizeof(codec->card->mixername), "%s %s",
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codec->core.vendor_name, codec->core.chip_name);
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codec->bus->mixer_assigned = codec->core.addr;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hda_codec_set_name);
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static int hda_codec_driver_probe(struct device *dev)
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{
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struct hda_codec *codec = dev_to_hda_codec(dev);
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struct module *owner = dev->driver->owner;
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hda_codec_patch_t patch;
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int err;
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if (codec->bus->core.ext_ops) {
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if (WARN_ON(!codec->bus->core.ext_ops->hdev_attach))
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return -EINVAL;
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return codec->bus->core.ext_ops->hdev_attach(&codec->core);
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}
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if (WARN_ON(!codec->preset))
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return -EINVAL;
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err = snd_hda_codec_set_name(codec, codec->preset->name);
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if (err < 0)
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goto error;
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err = snd_hdac_regmap_init(&codec->core);
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if (err < 0)
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goto error;
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if (!try_module_get(owner)) {
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err = -EINVAL;
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goto error;
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}
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patch = (hda_codec_patch_t)codec->preset->driver_data;
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if (patch) {
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err = patch(codec);
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if (err < 0)
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goto error_module_put;
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}
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err = snd_hda_codec_build_pcms(codec);
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if (err < 0)
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goto error_module;
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err = snd_hda_codec_build_controls(codec);
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if (err < 0)
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goto error_module;
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/* only register after the bus probe finished; otherwise it's racy */
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if (!codec->bus->bus_probing && codec->card->registered) {
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err = snd_card_register(codec->card);
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if (err < 0)
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goto error_module;
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snd_hda_codec_register(codec);
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}
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codec->core.lazy_cache = true;
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return 0;
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error_module:
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if (codec->patch_ops.free)
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codec->patch_ops.free(codec);
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error_module_put:
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module_put(owner);
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error:
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snd_hda_codec_cleanup_for_unbind(codec);
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codec->preset = NULL;
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return err;
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}
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static int hda_codec_driver_remove(struct device *dev)
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{
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struct hda_codec *codec = dev_to_hda_codec(dev);
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if (codec->bus->core.ext_ops) {
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if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach))
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return -EINVAL;
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return codec->bus->core.ext_ops->hdev_detach(&codec->core);
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}
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snd_hda_codec_disconnect_pcms(codec);
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snd_hda_jack_tbl_disconnect(codec);
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if (!refcount_dec_and_test(&codec->pcm_ref))
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wait_event(codec->remove_sleep, !refcount_read(&codec->pcm_ref));
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snd_power_sync_ref(codec->bus->card);
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if (codec->patch_ops.free)
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codec->patch_ops.free(codec);
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snd_hda_codec_cleanup_for_unbind(codec);
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codec->preset = NULL;
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module_put(dev->driver->owner);
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return 0;
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}
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static void hda_codec_driver_shutdown(struct device *dev)
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{
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snd_hda_codec_shutdown(dev_to_hda_codec(dev));
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}
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int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
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struct module *owner)
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{
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drv->core.driver.name = name;
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drv->core.driver.owner = owner;
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drv->core.driver.bus = &snd_hda_bus_type;
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drv->core.driver.probe = hda_codec_driver_probe;
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drv->core.driver.remove = hda_codec_driver_remove;
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drv->core.driver.shutdown = hda_codec_driver_shutdown;
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drv->core.driver.pm = &hda_codec_driver_pm;
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drv->core.type = HDA_DEV_LEGACY;
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drv->core.match = hda_codec_match;
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drv->core.unsol_event = hda_codec_unsol_event;
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return driver_register(&drv->core.driver);
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}
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EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
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void hda_codec_driver_unregister(struct hda_codec_driver *drv)
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{
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driver_unregister(&drv->core.driver);
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}
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EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
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static inline bool codec_probed(struct hda_codec *codec)
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{
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return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
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}
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/* try to auto-load codec module */
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static void request_codec_module(struct hda_codec *codec)
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{
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#ifdef MODULE
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char modalias[32];
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const char *mod = NULL;
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switch (codec->probe_id) {
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case HDA_CODEC_ID_GENERIC_HDMI:
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#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
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mod = "snd-hda-codec-hdmi";
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#endif
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break;
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case HDA_CODEC_ID_GENERIC:
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#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
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mod = "snd-hda-codec-generic";
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#endif
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break;
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default:
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snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias));
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mod = modalias;
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break;
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}
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if (mod)
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request_module(mod);
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#endif /* MODULE */
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}
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/* try to auto-load and bind the codec module */
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static void codec_bind_module(struct hda_codec *codec)
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{
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#ifdef MODULE
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request_codec_module(codec);
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if (codec_probed(codec))
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return;
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#endif
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}
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#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
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/* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
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static bool is_likely_hdmi_codec(struct hda_codec *codec)
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{
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hda_nid_t nid;
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/*
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* For ASoC users, if snd_hda_hdmi_codec module is denylisted and any
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* event causes i915 enumeration to fail, ->wcaps remains uninitialized.
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*/
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if (!codec->wcaps)
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return true;
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for_each_hda_codec_node(nid, codec) {
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unsigned int wcaps = get_wcaps(codec, nid);
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switch (get_wcaps_type(wcaps)) {
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case AC_WID_AUD_IN:
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return false; /* HDMI parser supports only HDMI out */
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case AC_WID_AUD_OUT:
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if (!(wcaps & AC_WCAP_DIGITAL))
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return false;
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break;
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}
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}
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return true;
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}
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#else
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/* no HDMI codec parser support */
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#define is_likely_hdmi_codec(codec) false
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#endif /* CONFIG_SND_HDA_CODEC_HDMI */
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static int codec_bind_generic(struct hda_codec *codec)
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{
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if (codec->probe_id)
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return -ENODEV;
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if (is_likely_hdmi_codec(codec)) {
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codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
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request_codec_module(codec);
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if (codec_probed(codec))
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return 0;
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}
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codec->probe_id = HDA_CODEC_ID_GENERIC;
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request_codec_module(codec);
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if (codec_probed(codec))
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return 0;
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return -ENODEV;
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}
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#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
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#define is_generic_config(codec) \
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(codec->modelname && !strcmp(codec->modelname, "generic"))
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#else
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#define is_generic_config(codec) 0
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#endif
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/**
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* snd_hda_codec_configure - (Re-)configure the HD-audio codec
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* @codec: the HDA codec
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*
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* Start parsing of the given codec tree and (re-)initialize the whole
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* patch instance.
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*
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* Returns 0 if successful or a negative error code.
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*/
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int snd_hda_codec_configure(struct hda_codec *codec)
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{
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int err;
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if (codec->configured)
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return 0;
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if (is_generic_config(codec))
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codec->probe_id = HDA_CODEC_ID_GENERIC;
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else
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codec->probe_id = 0;
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if (!device_is_registered(&codec->core.dev)) {
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err = snd_hdac_device_register(&codec->core);
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if (err < 0)
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return err;
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}
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if (!codec->preset)
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codec_bind_module(codec);
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if (!codec->preset) {
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err = codec_bind_generic(codec);
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if (err < 0) {
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codec_dbg(codec, "Unable to bind the codec\n");
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return err;
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}
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}
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codec->configured = 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
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