53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/* Copyright(c) 2021-2023 Realtek Corporation
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*/
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#include <linux/acpi.h>
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#include <linux/uuid.h>
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#include "acpi.h"
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#include "debug.h"
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static const guid_t rtw89_guid = GUID_INIT(0xD2A8C3E8, 0x4B69, 0x4F00,
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0x82, 0xBD, 0xFE, 0x86,
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0x07, 0x80, 0x3A, 0xA7);
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static int rtw89_acpi_dsm_get(struct rtw89_dev *rtwdev, union acpi_object *obj,
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u8 *value)
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{
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switch (obj->type) {
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case ACPI_TYPE_INTEGER:
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*value = (u8)obj->integer.value;
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break;
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case ACPI_TYPE_BUFFER:
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*value = obj->buffer.pointer[0];
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break;
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default:
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rtw89_debug(rtwdev, RTW89_DBG_UNEXP,
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"acpi dsm return unhandled type: %d\n", obj->type);
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return -EINVAL;
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}
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return 0;
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}
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int rtw89_acpi_evaluate_dsm(struct rtw89_dev *rtwdev,
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enum rtw89_acpi_dsm_func func, u8 *value)
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{
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union acpi_object *obj;
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int ret;
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obj = acpi_evaluate_dsm(ACPI_HANDLE(rtwdev->dev), &rtw89_guid,
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0, func, NULL);
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if (!obj) {
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rtw89_debug(rtwdev, RTW89_DBG_UNEXP,
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"acpi dsm fail to evaluate func: %d\n", func);
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return -ENOENT;
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}
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ret = rtw89_acpi_dsm_get(rtwdev, obj, value);
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ACPI_FREE(obj);
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return ret;
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}
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