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171 lines
4.0 KiB
171 lines
4.0 KiB
/*
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* sst_match_apci.c - SST (LPE) match for ACPI enumeration.
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*
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* Copyright (c) 2013-15, Intel Corporation.
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include "sst-acpi.h"
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static acpi_status sst_acpi_find_name(acpi_handle handle, u32 level,
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void *context, void **ret)
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{
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struct acpi_device *adev;
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const char *name = NULL;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (adev->status.present && adev->status.functional) {
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name = acpi_dev_name(adev);
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*(const char **)ret = name;
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
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{
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const char *name = NULL;
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acpi_status status;
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status = acpi_get_devices(hid, sst_acpi_find_name, NULL,
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(void **)&name);
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if (ACPI_FAILURE(status) || name[0] == '\0')
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return NULL;
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return name;
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}
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EXPORT_SYMBOL_GPL(sst_acpi_find_name_from_hid);
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static acpi_status sst_acpi_mach_match(acpi_handle handle, u32 level,
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void *context, void **ret)
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{
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unsigned long long sta;
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acpi_status status;
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*(bool *)context = true;
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
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*(bool *)context = false;
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return AE_OK;
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}
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bool sst_acpi_check_hid(const u8 hid[ACPI_ID_LEN])
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{
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acpi_status status;
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bool found = false;
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status = acpi_get_devices(hid, sst_acpi_mach_match, &found, NULL);
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if (ACPI_FAILURE(status))
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return false;
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return found;
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}
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EXPORT_SYMBOL_GPL(sst_acpi_check_hid);
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struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines)
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{
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struct sst_acpi_mach *mach;
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for (mach = machines; mach->id[0]; mach++) {
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if (sst_acpi_check_hid(mach->id) == true) {
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if (mach->machine_quirk)
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mach = mach->machine_quirk(mach);
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return mach;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(sst_acpi_find_machine);
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static acpi_status sst_acpi_find_package(acpi_handle handle, u32 level,
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void *context, void **ret)
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{
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struct acpi_device *adev;
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acpi_status status = AE_OK;
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struct sst_acpi_package_context *pkg_ctx = context;
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pkg_ctx->data_valid = false;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (adev->status.present && adev->status.functional) {
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *myobj = NULL;
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status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
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NULL, &buffer,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return AE_OK;
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myobj = buffer.pointer;
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if (!myobj || myobj->package.count != pkg_ctx->length) {
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kfree(buffer.pointer);
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return AE_OK;
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}
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status = acpi_extract_package(myobj,
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pkg_ctx->format, pkg_ctx->state);
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if (ACPI_FAILURE(status)) {
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kfree(buffer.pointer);
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return AE_OK;
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}
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kfree(buffer.pointer);
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pkg_ctx->data_valid = true;
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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bool sst_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
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struct sst_acpi_package_context *ctx)
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{
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acpi_status status;
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status = acpi_get_devices(hid, sst_acpi_find_package, ctx, NULL);
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if (ACPI_FAILURE(status) || !ctx->data_valid)
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return false;
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return true;
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}
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EXPORT_SYMBOL_GPL(sst_acpi_find_package_from_hid);
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struct sst_acpi_mach *sst_acpi_codec_list(void *arg)
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{
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struct sst_acpi_mach *mach = arg;
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struct sst_codecs *codec_list = (struct sst_codecs *) mach->quirk_data;
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int i;
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if (mach->quirk_data == NULL)
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return mach;
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for (i = 0; i < codec_list->num_codecs; i++) {
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if (sst_acpi_check_hid(codec_list->codecs[i]) != true)
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return NULL;
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}
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return mach;
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}
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EXPORT_SYMBOL_GPL(sst_acpi_codec_list);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel Common ACPI Match module");
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