1 files changed, 212 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_component.c b/sound/pci/hda/hda_component.c
new file mode 100644
index 000000000000..71860e2d6377
--- /dev/null
+++ b/sound/pci/hda/hda_component.c
@@ -0,0 +1,212 @@
+// 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 <rf@opensource.cirrus.com>");
+MODULE_LICENSE("GPL");