linux-imx

/*

 * Maxim MAX77620 Watchdog Driver

 *

 * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.

 *

 * Author: Laxman Dewangan <ldewangan@nvidia.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

​

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/mfd/max77620.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/watchdog.h>

​

static bool nowayout = WATCHDOG_NOWAYOUT;

​

struct max77620_wdt {

    struct device           *dev;

    struct regmap           *rmap;

    struct watchdog_device      wdt_dev;

};

​

static int max77620_wdt_start(struct watchdog_device *wdt_dev)

{

    struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev);

​

    return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2,

                  MAX77620_WDTEN, MAX77620_WDTEN);

}

​

static int max77620_wdt_stop(struct watchdog_device *wdt_dev)

{

    struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev);

​

    return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL2,

                  MAX77620_WDTEN, 0);

}

​

static int max77620_wdt_ping(struct watchdog_device *wdt_dev)

{

    struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev);

​

    return regmap_update_bits(wdt->rmap, MAX77620_REG_CNFGGLBL3,

                  MAX77620_WDTC_MASK, 0x1);

}

​

static int max77620_wdt_set_timeout(struct watchdog_device *wdt_dev,

                    unsigned int timeout)

{

    struct max77620_wdt *wdt = watchdog_get_drvdata(wdt_dev);

    unsigned int wdt_timeout;

    u8 regval;

    int ret;

​