ec.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include "ec.h"
#include <ec/compal/ene932/ec.h>
 
/* The keyboard matrix tells the EC how the keyboard is wired internally */
static void set_keyboard_matrix_us(void)
{
        ec_kbc_write_cmd(0x59);
        ec_kbc_write_ib(0xE5);
}
 
/* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */
static void enter_apm_mode(void)
{
        ec_kbc_write_cmd(0x59);
        ec_kbc_write_ib(0xE9);
}
 
void lenovo_s230u_ec_init(void)
{
        set_keyboard_matrix_us();
 
        /*
         * The EC has a special "blinking Caps Lock LED" mode which it normally
         * enters when it believes the OS is not responding. It occasionally
         * disables battery charging when in this mode, although other
         * functionality is unaffected. Although the EC starts in APM mode by
         * default, it only leaves the "blinking Caps Lock LED" mode after
         * receiving the following command.
         */
        enter_apm_mode();
 
        /* Enable external USB port power. */
        ec_mm_set_bit(0x3b, 4);
}