linux-imx

/*

 * Copyright (C) Nokia Corporation

 *

 * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>

 *

 * 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/module.h>

#include <linux/types.h>

#include <linux/slab.h>

#include <linux/kernel.h>

#include <linux/watchdog.h>

#include <linux/platform_device.h>

#include <linux/mfd/twl.h>

​

#define TWL4030_WATCHDOG_CFG_REG_OFFS   0x3

​

static bool nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, bool, 0);

MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "

    "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

​

static int twl4030_wdt_write(unsigned char val)

{

    return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,

                    TWL4030_WATCHDOG_CFG_REG_OFFS);

}

​

static int twl4030_wdt_start(struct watchdog_device *wdt)

{

    return twl4030_wdt_write(wdt->timeout + 1);

}

​

static int twl4030_wdt_stop(struct watchdog_device *wdt)

{

    return twl4030_wdt_write(0);

}

​

static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,

                   unsigned int timeout)

{

    wdt->timeout = timeout;

    return 0;

}

​

static const struct watchdog_info twl4030_wdt_info = {

    .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,

    .identity = "TWL4030 Watchdog",

};

​