src/ec/lenovo/h8/vboot.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <ec/acpi/ec.h>
#include <bootmode.h>
#include <timer.h>
#include <delay.h>

#include "h8.h"

/**
 * HACK: Use Fn-Key as recovery mode switch.
 * Wait for sense register ready and read Fn-Key state.
 */
int get_recovery_mode_switch(void)
{
	struct stopwatch sw;

	if (!CONFIG(H8_FN_KEY_AS_VBOOT_RECOVERY_SW))
		return 0;

	/* Tests showed that it takes:
	 *  - 700msec on Lenovo T500 from AC power on
	 *  - less than 150msec on Lenovo T520 from AC power on
	 */
	stopwatch_init_msecs_expire(&sw, 1000);
	while (!stopwatch_expired(&sw) && !h8_get_sense_ready())
		mdelay(1);

	if (!h8_get_sense_ready())
		return 0;

	return h8_get_fn_key();
}

/**
 * Only used if CONFIG(CHROMEOS) is set.
 * Always zero as the #WP pin of the flash is tied high.
 */
int get_write_protect_state(void)
{
	return 0;
}