u-boot-imx/board/freescale/common/recovery.c

/*
 * Copyright (C) 2010-2014 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <common.h>
#include <malloc.h>
#include <recovery.h>
#ifdef CONFIG_MXC_KPD
#include <mxc_keyb.h>
#endif
#include <asm/imx-common/boot_mode.h>

#ifdef CONFIG_MXC_KPD
#define PRESSED_VOL_DOWN	0x01
#define PRESSED_POWER	    0x02
#define RECOVERY_KEY_MASK (PRESSED_VOL_DOWN | PRESSED_POWER)

inline int test_key(int value, struct kpp_key_info *ki)
{
	return (ki->val == value) && (ki->evt == KDepress);
}

int check_key_pressing(void)
{
	struct kpp_key_info *key_info = NULL;
	int state = 0, keys, i;

	int ret = 0;

	mxc_kpp_init();
	/* due to glitch suppression circuit,
	   wait sometime to let all keys scanned. */
	udelay(1000);
	keys = mxc_kpp_getc(&key_info);

	printf("Detecting VOL_DOWN+POWER key for recovery(%d:%d) ...\n",
		keys, keys ? key_info->val : 0);
	if (keys > 1) {
		for (i = 0; i < keys; i++) {
			if (test_key(CONFIG_POWER_KEY, &key_info[i]))
				state |= PRESSED_POWER;
			else if (test_key(CONFIG_VOL_DOWN_KEY, &key_info[i]))
				state |= PRESSED_VOL_DOWN;
		}
	}
	if ((state & RECOVERY_KEY_MASK) == RECOVERY_KEY_MASK)
		ret = 1;
	if (key_info)
		free(key_info);
	return ret;
}
#else
/* If not using mxc keypad, currently we will detect power key on board */
int check_key_pressing(void)
{
	return 0;
}
#endif

void setup_recovery_env(void)
{
	board_recovery_setup();
}

/* export to lib_arm/board.c */
void check_recovery_mode(void)
{
	if (check_key_pressing()) {
		puts("Fastboot: Recovery key pressing got!\n");
		setup_recovery_env();
	} else if (check_recovery_cmd_file()) {
		puts("Fastboot: Recovery command file found!\n");
		setup_recovery_env();
	} else {
		puts("Fastboot: Normal\n");
	}
}