hda_component.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * HD audio Component Binding Interface
 *
 * Copyright (C) 2021, 2023 Cirrus Logic, Inc. and
 *			Cirrus Logic International Semiconductor Ltd.
 */

#include <linux/acpi.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <sound/hda_codec.h>
#include "hda_component.h"
#include "hda_local.h"

#ifdef CONFIG_ACPI
void hda_component_acpi_device_notify(struct hda_component_parent *parent,
				      acpi_handle handle, u32 event, void *data)
{
	struct hda_component *comp;
	int i;

	mutex_lock(&parent->mutex);
	for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
		comp = hda_component_from_index(parent, i);
		if (comp->dev && comp->acpi_notify)
			comp->acpi_notify(acpi_device_handle(comp->adev), event, comp->dev);
	}
	mutex_unlock(&parent->mutex);
}
EXPORT_SYMBOL_NS_GPL(hda_component_acpi_device_notify, "SND_HDA_SCODEC_COMPONENT");

int hda_component_manager_bind_acpi_notifications(struct hda_codec *cdc,
						  struct hda_component_parent *parent,
						  acpi_notify_handler handler, void *data)
{
	bool support_notifications = false;
	struct acpi_device *adev;
	struct hda_component *comp;
	int ret;
	int i;

	adev = parent->comps[0].adev;
	if (!acpi_device_handle(adev))
		return 0;

	for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
		comp = hda_component_from_index(parent, i);
		support_notifications = support_notifications ||
			comp->acpi_notifications_supported;
	}

	if (support_notifications) {
		ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
						  handler, data);
		if (ret < 0) {
			codec_warn(cdc, "Failed to install notify handler: %d\n", ret);
			return 0;
		}

		codec_dbg(cdc, "Notify handler installed\n");
	}

	return 0;
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_bind_acpi_notifications, "SND_HDA_SCODEC_COMPONENT");

void hda_component_manager_unbind_acpi_notifications(struct hda_codec *cdc,
						     struct hda_component_parent *parent,
						     acpi_notify_handler handler)
{
	struct acpi_device *adev;
	int ret;

	adev = parent->comps[0].adev;
	if (!acpi_device_handle(adev))
		return;

	ret = acpi_remove_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, handler);
	if (ret < 0)
		codec_warn(cdc, "Failed to uninstall notify handler: %d\n", ret);
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_unbind_acpi_notifications, "SND_HDA_SCODEC_COMPONENT");
#endif /* ifdef CONFIG_ACPI */

void hda_component_manager_playback_hook(struct hda_component_parent *parent, int action)
{
	struct hda_component *comp;
	int i;

	mutex_lock(&parent->mutex);
	for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
		comp = hda_component_from_index(parent, i);
		if (comp->dev && comp->pre_playback_hook)
			comp->pre_playback_hook(comp->dev, action);
	}
	for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
		comp = hda_component_from_index(parent, i);
		if (comp->dev && comp->playback_hook)
			comp->playback_hook(comp->dev, action);
	}
	for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
		comp = hda_component_from_index(parent, i);
		if (comp->dev && comp->post_playback_hook)
			comp->post_playback_hook(comp->dev, action);
	}
	mutex_unlock(&parent->mutex);
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_playback_hook, "SND_HDA_SCODEC_COMPONENT");

struct hda_scodec_match {
	const char *bus;
	const char *hid;
	const char *match_str;
	int index;
};

/* match the device name in a slightly relaxed manner */
static int hda_comp_match_dev_name(struct device *dev, void *data)
{
	struct hda_scodec_match *p = data;
	const char *d = dev_name(dev);
	int n = strlen(p->bus);
	char tmp[32];

	/* check the bus name */
	if (strncmp(d, p->bus, n))
		return 0;
	/* skip the bus number */
	if (isdigit(d[n]))
		n++;
	/* the rest must be exact matching */
	snprintf(tmp, sizeof(tmp), p->match_str, p->hid, p->index);
	return !strcmp(d + n, tmp);
}

int hda_component_manager_bind(struct hda_codec *cdc,
			       struct hda_component_parent *parent)
{
	int ret;

	/* Init shared and component specific data */
	memset(parent->comps, 0, sizeof(parent->comps));

	mutex_lock(&parent->mutex);
	ret = component_bind_all(hda_codec_dev(cdc), parent);
	mutex_unlock(&parent->mutex);

	return ret;
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_bind, "SND_HDA_SCODEC_COMPONENT");

int hda_component_manager_init(struct hda_codec *cdc,
			       struct hda_component_parent *parent, int count,
			       const char *bus, const char *hid,
			       const char *match_str,
			       const struct component_master_ops *ops)
{
	struct device *dev = hda_codec_dev(cdc);
	struct component_match *match = NULL;
	struct hda_scodec_match *sm;
	int ret, i;

	if (parent->codec) {
		codec_err(cdc, "Component binding already created (SSID: %x)\n",
			  cdc->core.subsystem_id);
		return -EINVAL;
	}
	parent->codec = cdc;

	mutex_init(&parent->mutex);

	for (i = 0; i < count; i++) {
		sm = devm_kmalloc(dev, sizeof(*sm), GFP_KERNEL);
		if (!sm)
			return -ENOMEM;

		sm->bus = bus;
		sm->hid = hid;
		sm->match_str = match_str;
		sm->index = i;
		component_match_add(dev, &match, hda_comp_match_dev_name, sm);
	}

	ret = component_master_add_with_match(dev, ops, match);
	if (ret)
		codec_err(cdc, "Fail to register component aggregator %d\n", ret);

	return ret;
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_init, "SND_HDA_SCODEC_COMPONENT");

void hda_component_manager_free(struct hda_component_parent *parent,
				const struct component_master_ops *ops)
{
	struct device *dev;

	if (!parent->codec)
		return;

	dev = hda_codec_dev(parent->codec);

	component_master_del(dev, ops);

	parent->codec = NULL;
}
EXPORT_SYMBOL_NS_GPL(hda_component_manager_free, "SND_HDA_SCODEC_COMPONENT");

MODULE_DESCRIPTION("HD Audio component binding library");
MODULE_AUTHOR("Richard Fitzgerald <[email protected]>");
MODULE_LICENSE("GPL");