wifi: iwlwifi: implement enable/disable for China 2022 regulatory

China 2022 regulations are enabled by default. Disable only when
disabled in BIOS or the firmware don't support this capability. If the
firmware has this capability, read BIOS configuration data in
function 4 using ACPI API and send GRP_REGULATORY_LARI_CONFIG_CHANGE_CMD
to the firmware. Any error while reading BIOS data results in enablement
of china 2022 regulations.
Signed-off-by: Anjaneyulu <pagadala.yesu.anjaneyulu@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230921110726.ba7cb3003e53.If5a180a59ee85ed4a4c9146cfeff841c25b81066@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/acpi.c

@@ -1011,6 +1011,7 @@ __le32 iwl_acpi_get_lari_config_bitmap(struct iwl_fw_runtime *fwrt)
 {
 	int ret;
 	u8 value;
+	u32 val;
 	__le32 config_bitmap = 0;
 
 	/*
@@ -1039,6 +1040,23 @@ __le32 iwl_acpi_get_lari_config_bitmap(struct iwl_fw_runtime *fwrt)
 				cpu_to_le32(LARI_CONFIG_CHANGE_ETSI_TO_DISABLED_MSK);
 	}
 
+	if (fw_has_capa(&fwrt->fw->ucode_capa,
+			IWL_UCODE_TLV_CAPA_CHINA_22_REG_SUPPORT)) {
+		/*
+		 ** Evaluate func 'DSM_FUNC_REGULATORY_CONFIG'
+		 */
+		ret = iwl_acpi_get_dsm_u32(fwrt->dev, 0,
+					   DSM_FUNC_REGULATORY_CONFIG,
+					   &iwl_guid, &val);
+		/*
+		 * China 2022 enable if the BIOS object does not exist or
+		 * if it is enabled in BIOS.
+		 */
+		if (ret < 0 || val & DSM_MASK_CHINA_22_REG)
+			config_bitmap |=
+				cpu_to_le32(LARI_CONFIG_ENABLE_CHINA_22_REG_SUPPORT_MSK);
+	}
+
 	return config_bitmap;
 }
 IWL_EXPORT_SYMBOL(iwl_acpi_get_lari_config_bitmap);

drivers/net/wireless/intel/iwlwifi/fw/acpi.h

@@ -134,6 +134,7 @@ enum iwl_dsm_funcs_rev_0 {
 	DSM_FUNC_DISABLE_SRD = 1,
 	DSM_FUNC_ENABLE_INDONESIA_5G2 = 2,
 	DSM_FUNC_ENABLE_6E = 3,
+	DSM_FUNC_REGULATORY_CONFIG = 4,
 	DSM_FUNC_11AX_ENABLEMENT = 6,
 	DSM_FUNC_ENABLE_UNII4_CHAN = 7,
 	DSM_FUNC_ACTIVATE_CHANNEL = 8,
@@ -164,6 +165,10 @@ enum iwl_dsm_values_rfi {
 	DSM_VALUE_RFI_MAX
 };
 
+enum iwl_dsm_masks_reg {
+	DSM_MASK_CHINA_22_REG = BIT(2)
+};
+
 #ifdef CONFIG_ACPI
 
 struct iwl_fw_runtime;

drivers/net/wireless/intel/iwlwifi/fw/api/nvm-reg.h

 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2012-2014, 2018-2022 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2023 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
@@ -480,18 +480,20 @@ union iwl_tas_config_cmd {
 	struct iwl_tas_config_cmd_v4 v4;
 };
 /**
- * enum iwl_lari_configs - bit masks for the various LARI config operations
+ * enum iwl_lari_config_masks - bit masks for the various LARI config operations
  * @LARI_CONFIG_DISABLE_11AC_UKRAINE_MSK: disable 11ac in ukraine
  * @LARI_CONFIG_CHANGE_ETSI_TO_PASSIVE_MSK: ETSI 5.8GHz SRD passive scan
  * @LARI_CONFIG_CHANGE_ETSI_TO_DISABLED_MSK: ETSI 5.8GHz SRD disabled
  * @LARI_CONFIG_ENABLE_5G2_IN_INDONESIA_MSK: enable 5.15/5.35GHz bands in
  * 	Indonesia
+ * @LARI_CONFIG_ENABLE_CHINA_22_REG_SUPPORT_MSK: enable 2022 china regulatory
  */
 enum iwl_lari_config_masks {
 	LARI_CONFIG_DISABLE_11AC_UKRAINE_MSK		= BIT(0),
 	LARI_CONFIG_CHANGE_ETSI_TO_PASSIVE_MSK		= BIT(1),
 	LARI_CONFIG_CHANGE_ETSI_TO_DISABLED_MSK		= BIT(2),
 	LARI_CONFIG_ENABLE_5G2_IN_INDONESIA_MSK		= BIT(3),
+	LARI_CONFIG_ENABLE_CHINA_22_REG_SUPPORT_MSK	= BIT(7),
 };
 
 #define IWL_11AX_UKRAINE_MASK 3

drivers/net/wireless/intel/iwlwifi/fw/debugfs.c

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2012-2014, 2018-2020 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2023 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
@@ -342,6 +342,12 @@ static int iwl_dbgfs_fw_info_seq_show(struct seq_file *seq, void *v)
 			   "    %d: %d\n",
 			   IWL_UCODE_TLV_CAPA_PPAG_CHINA_BIOS_SUPPORT,
 			   has_capa);
+		has_capa = fw_has_capa(&fw->ucode_capa,
+				       IWL_UCODE_TLV_CAPA_CHINA_22_REG_SUPPORT) ? 1 : 0;
+		seq_printf(seq,
+			   "    %d: %d\n",
+			   IWL_UCODE_TLV_CAPA_CHINA_22_REG_SUPPORT,
+			   has_capa);
 		seq_puts(seq, "fw_api_ver:\n");
 	}
 

drivers/net/wireless/intel/iwlwifi/fw/file.h

 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2008-2014, 2018-2021 Intel Corporation
+ * Copyright (C) 2008-2014, 2018-2023 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
@@ -472,6 +472,7 @@ enum iwl_ucode_tlv_capa {
 	IWL_UCODE_TLV_CAPA_OFFLOAD_BTM_SUPPORT		= (__force iwl_ucode_tlv_capa_t)113,
 	IWL_UCODE_TLV_CAPA_STA_EXP_MFP_SUPPORT		= (__force iwl_ucode_tlv_capa_t)114,
 	IWL_UCODE_TLV_CAPA_SNIFF_VALIDATE_SUPPORT	= (__force iwl_ucode_tlv_capa_t)116,
+	IWL_UCODE_TLV_CAPA_CHINA_22_REG_SUPPORT		= (__force iwl_ucode_tlv_capa_t)117,
 
 	NUM_IWL_UCODE_TLV_CAPA
 /*