src/mainboard/lenovo/s230u/ec.c

/* 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);
}