wifi: rtw89: introduce realtek ACPI DSM method

Introduce realtek ACPI DSM method to get required BIOS
configurations. It will be used in the following commits.

And, enum rtw89_acpi_dsm_func is added for listing the functions
which are currently recognized.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230508081211.38760-2-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw89/Makefile b/drivers/net/wireless/realtek/rtw89/Makefile
index 2dc48fa..99e870d 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/Makefile
+++ b/drivers/net/wireless/realtek/rtw89/Makefile
@@ -13,7 +13,8 @@ rtw89_core-y += core.o \
                coex.o \
                ps.o \
                chan.o \
-               ser.o
+               ser.o \
+               acpi.o
 
 rtw89_core-$(CONFIG_PM) += wow.o
 

diff --git a/drivers/net/wireless/realtek/rtw89/acpi.c b/drivers/net/wireless/realtek/rtw89/acpi.c
new file mode 100644 (file)
index 0000000..8aaf83a
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/acpi.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2021-2023  Realtek Corporation
+ */
+
+#include <linux/acpi.h>
+#include <linux/uuid.h>
+
+#include "acpi.h"
+#include "debug.h"
+
+static const guid_t rtw89_guid = GUID_INIT(0xD2A8C3E8, 0x4B69, 0x4F00,
+                                          0x82, 0xBD, 0xFE, 0x86,
+                                          0x07, 0x80, 0x3A, 0xA7);
+
+static int rtw89_acpi_dsm_get(struct rtw89_dev *rtwdev, union acpi_object *obj,
+                             u8 *value)
+{
+       switch (obj->type) {
+       case ACPI_TYPE_INTEGER:
+               *value = (u8)obj->integer.value;
+               break;
+       case ACPI_TYPE_BUFFER:
+               *value = obj->buffer.pointer[0];
+               break;
+       default:
+               rtw89_debug(rtwdev, RTW89_DBG_UNEXP,
+                           "acpi dsm return unhandled type: %d\n", obj->type);
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+int rtw89_acpi_evaluate_dsm(struct rtw89_dev *rtwdev,
+                           enum rtw89_acpi_dsm_func func, u8 *value)
+{
+       union acpi_object *obj;
+       int ret;
+
+       obj = acpi_evaluate_dsm(ACPI_HANDLE(rtwdev->dev), &rtw89_guid,
+                               0, func, NULL);
+       if (!obj) {
+               rtw89_debug(rtwdev, RTW89_DBG_UNEXP,
+                           "acpi dsm fail to evaluate func: %d\n", func);
+               return -ENOENT;
+       }
+
+       ret = rtw89_acpi_dsm_get(rtwdev, obj, value);
+
+       ACPI_FREE(obj);
+       return ret;
+}

diff --git a/drivers/net/wireless/realtek/rtw89/acpi.h b/drivers/net/wireless/realtek/rtw89/acpi.h
new file mode 100644 (file)
index 0000000..ed74d8c
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/acpi.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
+/* Copyright(c) 2021-2023  Realtek Corporation
+ */
+
+#ifndef __RTW89_ACPI_H__
+#define __RTW89_ACPI_H__
+
+#include "core.h"
+
+enum rtw89_acpi_dsm_func {
+       RTW89_ACPI_DSM_FUNC_IDN_BAND_SUP = 2,
+       RTW89_ACPI_DSM_FUNC_6G_DIS = 3,
+       RTW89_ACPI_DSM_FUNC_6G_BP = 4,
+       RTW89_ACPI_DSM_FUNC_TAS_EN = 5,
+       RTW89_ACPI_DSM_FUNC_59G_EN = 6,
+};
+
+int rtw89_acpi_evaluate_dsm(struct rtw89_dev *rtwdev,
+                           enum rtw89_acpi_dsm_func func, u8 *value);
+
+#endif