diff options
Diffstat (limited to 'sound/soc/soc-acpi.c')
| -rw-r--r-- | sound/soc/soc-acpi.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c new file mode 100644 index 000000000000..f21df28bc28e --- /dev/null +++ b/sound/soc/soc-acpi.c @@ -0,0 +1,175 @@ +/* + * soc-apci.c - support for ACPI enumeration. + * + * Copyright (c) 2013-15, Intel Corporation. + * + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <sound/soc-acpi.h> + +static acpi_status snd_soc_acpi_find_name(acpi_handle handle, u32 level, + void *context, void **ret) +{ + struct acpi_device *adev; + const char *name = NULL; + + if (acpi_bus_get_device(handle, &adev)) + return AE_OK; + + if (adev->status.present && adev->status.functional) { + name = acpi_dev_name(adev); + *(const char **)ret = name; + return AE_CTRL_TERMINATE; + } + + return AE_OK; +} + +const char *snd_soc_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN]) +{ + const char *name = NULL; + acpi_status status; + + status = acpi_get_devices(hid, snd_soc_acpi_find_name, NULL, + (void **)&name); + + if (ACPI_FAILURE(status) || name[0] == '\0') + return NULL; + + return name; +} +EXPORT_SYMBOL_GPL(snd_soc_acpi_find_name_from_hid); + +static acpi_status snd_soc_acpi_mach_match(acpi_handle handle, u32 level, + void *context, void **ret) +{ + unsigned long long sta; + acpi_status status; + + *(bool *)context = true; + status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); + if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT)) + *(bool *)context = false; + + return AE_OK; +} + +bool snd_soc_acpi_check_hid(const u8 hid[ACPI_ID_LEN]) +{ + acpi_status status; + bool found = false; + + status = acpi_get_devices(hid, snd_soc_acpi_mach_match, &found, NULL); + + if (ACPI_FAILURE(status)) + return false; + + return found; +} +EXPORT_SYMBOL_GPL(snd_soc_acpi_check_hid); + +struct snd_soc_acpi_mach * +snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines) +{ + struct snd_soc_acpi_mach *mach; + + for (mach = machines; mach->id[0]; mach++) { + if (snd_soc_acpi_check_hid(mach->id) == true) { + if (mach->machine_quirk == NULL) + return mach; + + if (mach->machine_quirk(mach) != NULL) + 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 (snd_soc_acpi_check_hid(codec_list->codecs[i]) != true) + return NULL; + } + + return mach; +} +EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ALSA SoC ACPI module"); |