board_id.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <boardid.h>
#include <ec/acpi/ec.h>
#include <ec/google/chromeec/ec.h>
#include <stdint.h>
 
#include "board_id.h"
 
static uint32_t get_board_id_via_ext_ec(void)
{
        uint32_t id = BOARD_ID_INIT;
 
        if (google_chromeec_get_board_version(&id))
                id = BOARD_ID_UNKNOWN;
 
        return id;
}
 
/*
 * Get Board ID via EC I/O port write/read
 * Board id is 5 bit, so mask other bits while returning board id.
 */
int get_board_id(void)
{
        MAYBE_STATIC_NONZERO int id = -1;
 
        if (id < 0) {
                if (CONFIG(EC_GOOGLE_CHROMEEC)) {
                        id = get_board_id_via_ext_ec();
                } else {
                        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();
                                id = (buffer[0] << 8) | buffer[1];
                        }
                }
        }
 
        return (id & 0x1f);
}