// 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");