[linux-2.6-block.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 <linux/export.h>
#include <linux/module.h>
#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
261e9082 PG	7	#include <linux/export.h>
261e9082 PG	8	#include <linux/module.h>
7feb2f78	9	#include <sound/soc-acpi.h>
95f09801	10
7feb2f78 PLB	11	struct snd_soc_acpi_mach *
7feb2f78 PLB	12	snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
95f09801	13	{
7feb2f78	14	struct snd_soc_acpi_mach *mach;
a3e620f8	15	struct snd_soc_acpi_mach *mach_alt;
95f09801	16
7827d669	17	for (mach = machines; mach->id[0]; mach++) {
0d5ea120	18	if (acpi_dev_present(mach->id, NULL, -1)) {
a3e620f8 KJ	19	if (mach->machine_quirk) {
	20	mach_alt = mach->machine_quirk(mach);
	21	if (!mach_alt)
	22	continue; /* not full match, ignore */
	23	mach = mach_alt;
	24	}
	25
5c256045	26	return mach;
7827d669 N	27	}
7827d669 N	28	}
95f09801 VK	29	return NULL;
95f09801 VK	30	}
7feb2f78	31	EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
8ceffd22	32
7feb2f78 PLB	33	static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
7feb2f78 PLB	34	void context, void *ret)
34218947 PLB	35	{
	36	struct acpi_device *adev;
	37	acpi_status status = AE_OK;
7feb2f78	38	struct snd_soc_acpi_package_context *pkg_ctx = context;
34218947 PLB	39
	40	pkg_ctx->data_valid = false;
	41
	42	if (acpi_bus_get_device(handle, &adev))
	43	return AE_OK;
	44
	45	if (adev->status.present && adev->status.functional) {
	46	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	47	union acpi_object *myobj = NULL;
	48
	49	status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
	50	NULL, &buffer,
	51	ACPI_TYPE_PACKAGE);
	52	if (ACPI_FAILURE(status))
	53	return AE_OK;
	54
	55	myobj = buffer.pointer;
	56	if (!myobj \|\| myobj->package.count != pkg_ctx->length) {
	57	kfree(buffer.pointer);
	58	return AE_OK;
	59	}
	60
	61	status = acpi_extract_package(myobj,
	62	pkg_ctx->format, pkg_ctx->state);
	63	if (ACPI_FAILURE(status)) {
	64	kfree(buffer.pointer);
	65	return AE_OK;
	66	}
	67
	68	kfree(buffer.pointer);
	69	pkg_ctx->data_valid = true;
	70	return AE_CTRL_TERMINATE;
	71	}
	72
	73	return AE_OK;
	74	}
	75
7feb2f78 PLB	76	bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
7feb2f78 PLB	77	struct snd_soc_acpi_package_context *ctx)
34218947 PLB	78	{
	79	acpi_status status;
	80
7feb2f78	81	status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
34218947 PLB	82
	83	if (ACPI_FAILURE(status) \|\| !ctx->data_valid)
	84	return false;
	85
	86	return true;
	87	}
7feb2f78	88	EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
34218947	89
7feb2f78	90	struct snd_soc_acpi_mach snd_soc_acpi_codec_list(void arg)
54746dab	91	{
7feb2f78 PLB	92	struct snd_soc_acpi_mach *mach = arg;
	93	struct snd_soc_acpi_codecs *codec_list =
	94	(struct snd_soc_acpi_codecs *) mach->quirk_data;
54746dab N	95	int i;
	96
	97	if (mach->quirk_data == NULL)
	98	return mach;
	99
	100	for (i = 0; i < codec_list->num_codecs; i++) {
0d5ea120	101	if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
54746dab N	102	return NULL;
	103	}
	104
	105	return mach;
	106	}
7feb2f78	107	EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
54746dab	108
8ceffd22	109	MODULE_LICENSE("GPL v2");
7feb2f78	110	MODULE_DESCRIPTION("ALSA SoC ACPI module");