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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cbfs.h>
#include <console/console.h>
#include <drivers/vpd/vpd.h>
#include <lib.h>
#include <sar.h>
#include <stdlib.h>
#include <string.h>
#include <types.h>
#define WIFI_SAR_CBFS_FILENAME "wifi_sar_defaults.hex"
/*
* Retrieve WiFi SAR limits data from CBFS and decode it
* WiFi SAR data is expected in the format: [<WRDD><EWRD>][WGDS]
*
* [<WRDD><EWRD>] = NUM_SAR_LIMITS * BYTES_PER_SAR_LIMIT bytes.
* [WGDS]=[WGDS_VERSION][WGDS_DATA]
*
* For [WGDS_VERSION] 0x00,
* [WGDS_DATA] = [GROUP#0][GROUP#1][GROUP#2]
*
* [GROUP#<i>] =
* [2.4Ghz – Max Allowed][2.4Ghz – Chain A Offset]
* [2.4Ghz – Chain B Offset][5Ghz – Max Allowed]
* [5Ghz – Chain A Offset][5Ghz – Chain B Offset]
*
* [GROUP#0] is for FCC
* [GROUP#1] is for Europe/Japan
* [GROUP#2] is for ROW
*/
int get_wifi_sar_limits(struct wifi_sar_limits *sar_limits)
{
const char *filename;
size_t sar_str_len, sar_bin_len;
char *sar_str;
int ret = -1;
/*
* If GEO_SAR_ENABLE is not selected, SAR file does not contain
* delta table settings.
*/
if (CONFIG(GEO_SAR_ENABLE))
sar_bin_len = sizeof(struct wifi_sar_limits);
else
sar_bin_len = sizeof(struct wifi_sar_limits) -
sizeof(struct wifi_sar_delta_table);
/*
* Each hex digit is represented as a character in CBFS SAR file. Thus,
* the SAR file is double the size of its binary buffer equivalent.
* Hence, the buffer size allocated for SAR file is:
* `2 * sar_bin_len + 1`
* 1 additional byte is allocated to store the terminating '\0'.
*/
sar_str_len = 2 * sar_bin_len + 1;
sar_str = malloc(sar_str_len);
if (!sar_str) {
printk(BIOS_ERR, "Failed to allocate space for SAR string!\n");
return ret;
}
printk(BIOS_DEBUG, "Checking CBFS for default SAR values\n");
filename = get_wifi_sar_cbfs_filename();
if (filename == NULL)
filename = WIFI_SAR_CBFS_FILENAME;
if (cbfs_load(filename, sar_str, sar_str_len) != sar_str_len) {
printk(BIOS_ERR, "%s has bad len in CBFS\n", filename);
goto done;
}
memset(sar_limits, 0, sizeof(*sar_limits));
if (hexstrtobin(sar_str, (uint8_t *)sar_limits, sar_bin_len) != sar_bin_len) {
printk(BIOS_ERR, "Error: wifi_sar contains non-hex value!\n");
goto done;
}
ret = 0;
done:
free(sar_str);
return ret;
}
__weak
const char *get_wifi_sar_cbfs_filename(void)
{
return WIFI_SAR_CBFS_FILENAME;
}
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