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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2021, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <asm/setup.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "cnss_utils.h"
#define CDB_PATH "/chosen/config"
#define WIFI_MAC "wlan_mac1"
static void set_wifi_mac(void)
{
u8 mac[6] = {0};
unsigned int size;
unsigned char *mac_addr = NULL;
struct device_node *node;
unsigned int mac_found = 0;
node = of_find_node_by_path(CDB_PATH);
if (!node) {
pr_err("[WLAN] CDB Node not created under %s", CDB_PATH);
} else {
mac_addr = (unsigned char *)
of_get_property(node, WIFI_MAC, &size);
}
/* In case Missing Provisioned MAC Address, exit with error */
if (!mac_addr) {
pr_err("[WLAN] Missing Provisioned MAC address\n");
return;
}
/* Start decoding MAC Address
* Note that 2 formats are supported for now
* AA:BB:CC:DD:EE:FF (with separating colons) and
* AABBCCDDEEFF (without separating colons) */
if (sscanf(mac_addr,
"%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4],
&mac[5]) == 6) {
mac_found = 1;
} else if (sscanf(mac_addr,
"%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4],
&mac[5]) == 6) {
mac_found = 1;
}
/* Make sure Address decoding succeeds */
if (!mac_found) {
pr_err("[WLAN] Invalid format for Provisioned MAC Address\n");
return;
}
/* Make sure Provisioned MAC Address is globally Administered */
if (mac[0] & 2) {
pr_err("[WLAN] Invalid Provisioned MAC Address\n");
return;
}
/* Send provisioned MAC Address to the platform driver */
if (cnss_utils_set_wlan_mac_address(mac, sizeof(mac)) != 0) {
pr_err("[WLAN] set wlan mac address failed\n");
return;
}
/* Now derive the derived mac address
* by flipping the locally administred bit */
mac[0] = mac[0] | 2;
if (cnss_utils_set_wlan_derived_mac_address(mac, sizeof(mac)) != 0) {
pr_err("[WLAN] set wlan derived mac address failed\n");
return;
}
return;
}
static int __init wifi_mac_init(void)
{
set_wifi_mac();
return 0;
}
late_initcall(wifi_mac_init);
MODULE_AUTHOR("Google");
MODULE_DESCRIPTION("Google set wlan mac");
MODULE_LICENSE("GPL v2");
MODULE_SOFTDEP("pre: cnss2");
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