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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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 <console/console.h>
#include <types.h>
#include <string.h>
#include <sar.h>
#include "cros_vpd.h"
/* Retrieve the wifi SAR limits data from VPD and decode it */
int get_wifi_sar_limits(struct wifi_sar_limits *sar_limits)
{
const char *wifi_sar_limit_key = CROS_VPD_WIFI_SAR_NAME;
/*
* cros_vpd_gets() reads in one less than size characters from the VPD
* with a terminating null byte ('\0') stored as the last character into
* the buffer, thus the increasing by 1 for buffer_size.
*/
const size_t buffer_size = (sizeof(struct wifi_sar_limits) /
sizeof(uint8_t)) * 2 + 1;
char wifi_sar_limit_str[buffer_size];
uint8_t bin_buffer[sizeof(struct wifi_sar_limits)];
/* Try to read the SAR limit entry from VPD */
if (!cros_vpd_gets(wifi_sar_limit_key, wifi_sar_limit_str,
ARRAY_SIZE(wifi_sar_limit_str))) {
printk(BIOS_ERR,
"Error: Could not locate '%s' in VPD\n",
wifi_sar_limit_key);
return -1;
}
printk(BIOS_DEBUG, "VPD wifi_sar = %s\n", wifi_sar_limit_str);
/* Decode the heximal encoded string to binary values */
if (hexstrtobin(wifi_sar_limit_str, bin_buffer,
sizeof(struct wifi_sar_limits))
< sizeof(struct wifi_sar_limits)) {
printk(BIOS_ERR,
"Error: VPD wifi_sar contains non-heximal value!\n");
return -1;
}
/* Fill the sar_limits structure with the decoded data */
for (int i = 0; i < NUM_SAR_LIMITS; i++)
memcpy(sar_limits->sar_limit[i],
&bin_buffer[BYTES_PER_SAR_LIMIT * i],
BYTES_PER_SAR_LIMIT);
return 0;
}
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