board_id.c

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/* SPDX-License-Identifier: GPL-2.0-only */
#include "board_id.h"
#include <ec/acpi/ec.h>
#include <stdint.h>
#include <stddef.h>
 
/*
 * Get Board info via EC I/O port write/read
 */
int get_ec_boardinfo(void)
{
        MAYBE_STATIC_NONZERO int ec_info = -1;
        if (ec_info < 0) {
                uint8_t buffer[2];
                uint8_t index;
                if (send_ec_command(EC_FAB_ID_CMD) == 0) {
                        for (index = 0; index < sizeof(buffer); index++)
                                buffer[index] = recv_ec_data();
                        ec_info = (buffer[1] << 8) | buffer[0];
                }
        }
        return ec_info;
}
 
/* Get spd index */
int get_spd_index(u8 *spd_index)
{
        int ec_info = get_ec_boardinfo();
        if (ec_info >= 0) {
                *spd_index = ((uint16_t)ec_info >> 5) & 0x7;
                return 0;
        }
        return -1;
}
 
/* Get Board Id */
int get_board_id(void)
{
        int ec_info = get_ec_boardinfo();
        if (ec_info >= 0)
                return ((uint16_t)ec_info >> 8) & 0xff;
 
        return -1;
}