linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Watchdog driver for the wm8350

 *

 * Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.com>

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/watchdog.h>

#include <linux/uaccess.h>

#include <linux/mfd/wm8350/core.h>

​

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 DEFINE_MUTEX(wdt_mutex);

​

static struct {

    unsigned int time;  /* Seconds */

    u16 val;        /* To be set in WM8350_SYSTEM_CONTROL_2 */

} wm8350_wdt_cfgs[] = {

    { 1, 0x02 },

    { 2, 0x04 },

    { 4, 0x05 },

};

​

static int wm8350_wdt_set_timeout(struct watchdog_device *wdt_dev,

                  unsigned int timeout)

{

    struct wm8350 *wm8350 = watchdog_get_drvdata(wdt_dev);

    int ret, i;

    u16 reg;

​

    for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)

        if (wm8350_wdt_cfgs[i].time == timeout)

            break;

    if (i == ARRAY_SIZE(wm8350_wdt_cfgs))

        return -EINVAL;

​

    mutex_lock(&wdt_mutex);

    wm8350_reg_unlock(wm8350);

​

    reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);

    reg &= ~WM8350_WDOG_TO_MASK;

    reg |= wm8350_wdt_cfgs[i].val;

    ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);

​

    wm8350_reg_lock(wm8350);

    mutex_unlock(&wdt_mutex);

​

    wdt_dev->timeout = timeout;

    return ret;

}

​