[linux.git] / sound / soc / soc-acpi.c

// SPDX-License-Identifier: GPL-2.0
//
// soc-apci.c - support for ACPI enumeration.
//
// Copyright (c) 2013-15, Intel Corporation.

#include <sound/soc-acpi.h>

struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
{
	struct snd_soc_acpi_mach *mach;
	struct snd_soc_acpi_mach *mach_alt;

	for (mach = machines; mach->id[0]; mach++) {
		if (acpi_dev_present(mach->id, NULL, -1)) {
			if (mach->machine_quirk) {
				mach_alt = mach->machine_quirk(mach);
				if (!mach_alt)
					continue; /* not full match, ignore */
				mach = mach_alt;
			}

			return mach;
		}
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);

static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
					     void *context, void **ret)
{
	struct acpi_device *adev;
	acpi_status status = AE_OK;
	struct snd_soc_acpi_package_context *pkg_ctx = context;

	pkg_ctx->data_valid = false;

	if (acpi_bus_get_device(handle, &adev))
		return AE_OK;

	if (adev->status.present && adev->status.functional) {
		struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
		union acpi_object  *myobj = NULL;

		status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
						NULL, &buffer,
						ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
			return AE_OK;

		myobj = buffer.pointer;
		if (!myobj || myobj->package.count != pkg_ctx->length) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		status = acpi_extract_package(myobj,
					pkg_ctx->format, pkg_ctx->state);
		if (ACPI_FAILURE(status)) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		kfree(buffer.pointer);
		pkg_ctx->data_valid = true;
		return AE_CTRL_TERMINATE;
	}

	return AE_OK;
}

bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
				struct snd_soc_acpi_package_context *ctx)
{
	acpi_status status;

	status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);

	if (ACPI_FAILURE(status) || !ctx->data_valid)
		return false;

	return true;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);

struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
{
	struct snd_soc_acpi_mach *mach = arg;
	struct snd_soc_acpi_codecs *codec_list =
		(struct snd_soc_acpi_codecs *) mach->quirk_data;
	int i;

	if (mach->quirk_data == NULL)
		return mach;

	for (i = 0; i < codec_list->num_codecs; i++) {
		if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
			return NULL;
	}

	return mach;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ALSA SoC ACPI module");
Commit	Line	Data
7730bb13 KM	1	// SPDX-License-Identifier: GPL-2.0
	2	//
	3	// soc-apci.c - support for ACPI enumeration.
	4	//
	5	// Copyright (c) 2013-15, Intel Corporation.
95f09801	6
7feb2f78	7	#include <sound/soc-acpi.h>
95f09801	8
7feb2f78 PLB	9	struct snd_soc_acpi_mach *
7feb2f78 PLB	10	snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
95f09801	11	{
7feb2f78	12	struct snd_soc_acpi_mach *mach;
a3e620f8	13	struct snd_soc_acpi_mach *mach_alt;
95f09801	14
7827d669	15	for (mach = machines; mach->id[0]; mach++) {
0d5ea120	16	if (acpi_dev_present(mach->id, NULL, -1)) {
a3e620f8 KJ	17	if (mach->machine_quirk) {
	18	mach_alt = mach->machine_quirk(mach);
	19	if (!mach_alt)
	20	continue; /* not full match, ignore */
	21	mach = mach_alt;
	22	}
	23
5c256045	24	return mach;
7827d669 N	25	}
7827d669 N	26	}
95f09801 VK	27	return NULL;
95f09801 VK	28	}
7feb2f78	29	EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
8ceffd22	30
7feb2f78 PLB	31	static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
7feb2f78 PLB	32	void context, void *ret)
34218947 PLB	33	{
	34	struct acpi_device *adev;
	35	acpi_status status = AE_OK;
7feb2f78	36	struct snd_soc_acpi_package_context *pkg_ctx = context;
34218947 PLB	37
	38	pkg_ctx->data_valid = false;
	39
	40	if (acpi_bus_get_device(handle, &adev))
	41	return AE_OK;
	42
	43	if (adev->status.present && adev->status.functional) {
	44	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	45	union acpi_object *myobj = NULL;
	46
	47	status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
	48	NULL, &buffer,
	49	ACPI_TYPE_PACKAGE);
	50	if (ACPI_FAILURE(status))
	51	return AE_OK;
	52
	53	myobj = buffer.pointer;
	54	if (!myobj \|\| myobj->package.count != pkg_ctx->length) {
	55	kfree(buffer.pointer);
	56	return AE_OK;
	57	}
	58
	59	status = acpi_extract_package(myobj,
	60	pkg_ctx->format, pkg_ctx->state);
	61	if (ACPI_FAILURE(status)) {
	62	kfree(buffer.pointer);
	63	return AE_OK;
	64	}
	65
	66	kfree(buffer.pointer);
	67	pkg_ctx->data_valid = true;
	68	return AE_CTRL_TERMINATE;
	69	}
	70
	71	return AE_OK;
	72	}
	73
7feb2f78 PLB	74	bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
7feb2f78 PLB	75	struct snd_soc_acpi_package_context *ctx)
34218947 PLB	76	{
	77	acpi_status status;
	78
7feb2f78	79	status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
34218947 PLB	80
	81	if (ACPI_FAILURE(status) \|\| !ctx->data_valid)
	82	return false;
	83
	84	return true;
	85	}
7feb2f78	86	EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
34218947	87
7feb2f78	88	struct snd_soc_acpi_mach snd_soc_acpi_codec_list(void arg)
54746dab	89	{
7feb2f78 PLB	90	struct snd_soc_acpi_mach *mach = arg;
	91	struct snd_soc_acpi_codecs *codec_list =
	92	(struct snd_soc_acpi_codecs *) mach->quirk_data;
54746dab N	93	int i;
	94
	95	if (mach->quirk_data == NULL)
	96	return mach;
	97
	98	for (i = 0; i < codec_list->num_codecs; i++) {
0d5ea120	99	if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
54746dab N	100	return NULL;
	101	}
	102
	103	return mach;
	104	}
7feb2f78	105	EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
54746dab	106
8ceffd22	107	MODULE_LICENSE("GPL v2");
7feb2f78	108	MODULE_DESCRIPTION("ALSA SoC ACPI module");