/**
 *
 *   Copyright (C) 2018 AVM GmbH <fritzbox_info@avm.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/reboot.h>
#include <linux/kmod.h>
#include "avm_event.h"

static void *factory_reset_kernel_handle;

static void factory_reset_received(void *context __always_unused, unsigned char *buf, unsigned int len __always_unused)
{
	struct _avm_event_push_button *event = (struct _avm_event_push_button *)buf;

	if (!event)
		return;

	if (event->key == avm_event_push_button_power_set_factory_kernel) {
		char *argv[] = { "/bin/sh", "/bin/setfactorydefaults", NULL };
		char *envp[] = {
					"HOME=/",
					"TERM=linux",
					"PATH=/sbin:/bin:/usr/sbin:/usr/bin", NULL };

		pr_info("Trigger factory reset using usermodehelper\n");

		call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
		pr_info("Restart for factory reset\n");
		kernel_restart(NULL);
	}
}

void __init avm_factory_reset_init(void)
{
	struct _avm_event_id_mask id_mask;

	pr_info("Register push button event to receive the set_factory_kernel event\n");
	factory_reset_kernel_handle = avm_event_sink_register("factory_reset_kernel",
						avm_event_build_id_mask(&id_mask, 1, avm_event_id_push_button),
						factory_reset_received, NULL);
	if (factory_reset_kernel_handle == NULL) {
		pr_err("%s factory_reset_kernel event sink not registered\n", __func__);
	}
}