[WATCHDOG] NS pc87413-wdt Watchdog driver v1.1 (00b3b3e6) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/char/watchdog/pc87413_wdt.c

+330 −304

Original line number	Diff line number	Diff line
		/*
		* NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
		*
		* This code is based on wdt.c with original copyright
		* This code is based on wdt.c with original copyright.
		*
		* (C) Copyright 2006 Marcus Junker, <junker@anduras.de>
		* and Sven Anders, <anders@anduras.de>
		* (C) Copyright 2006 Sven Anders, <anders@anduras.de>
		* and Marcus Junker, <junker@anduras.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.
		*
		* Neither Marcus Junker, Sven Anders nor ANDURAS AG
		* Neither Sven Anders, Marcus Junker nor ANDURAS AG
		* admit liability nor provide warranty for any of this software.
		* This material is provided "AS-IS" and at no charge.
		*
		* Release 1.00.
		*
		* Release 1.1
		*/


		/* #define DEBUG 1 */

		#include <linux/config.h>
		#include <linux/module.h>
		#include <linux/types.h>
		@@ -41,11 +37,17 @@
		#include <asm/uaccess.h>
		#include <asm/system.h>

		#define WATCHDOG_NAME "pc87413 WDT"
		#define PFX WATCHDOG_NAME ": "
		#define DPFX WATCHDOG_NAME " - DEBUG: "
		/* #define DEBUG 1 */

		#define DEFAULT_TIMEOUT 1 /* 1 minute */
		#define MAX_TIMEOUT 255

		#define VERSION "1.1"
		#define MODNAME "pc87413 WDT"
		#define PFX MODNAME ": "
		#define DPFX MODNAME " - DEBUG: "

		#define WDT_INDEX_IO_PORT (io+0) /* */
		#define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */
		#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
		#define SWC_LDN 0x04
		#define SIOCFG2 0x22 /* Serial IO register */
		@@ -53,45 +55,26 @@
		#define WDTO 0x11 /* Watchdog timeout register */
		#define WDCFG 0x12 /* Watchdog config register */

		#define WD_TIMEOUT 1 /* minutes (1 ... 255) */
		static int io = 0x2E; /* Address used on Portwell Boards */

		static int timeout = DEFAULT_TIMEOUT; /* timeout value */
		static unsigned long timer_enabled = 0; /* is the timer enabled? */

		static int pc87413_is_open=0;
		static char expect_close; /* is the close expected? */

		/*
		* You must set these - there is no sane way to probe for this board.
		* You can use pc87413=x to set these now.
		*/
		static spinlock_t io_lock; /* to guard the watchdog from io races */

		static int nowayout = WATCHDOG_NOWAYOUT;

		/* -- Low level function ----------------------------------------*/

		/**
		* module_params
		*
		* Setup options. The board isn't really probe-able so we have to
		* get the user to tell us the configuration.
		*/

		static int io=0x2E; /* Normally used addres on Portwell Boards */
		module_param(io, int, 0);
		MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME " io port (default 0x2E)");
		/* Select pins for Watchdog output */

		static int timeout = WD_TIMEOUT; /* in minutes */
		module_param(timeout, int, 0);
		MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");


		/******************************************
		* Helper functions
		******************************************/

		static void
		pc87413_select_wdt_out (void)
		static inline void pc87413_select_wdt_out (void)
		{

		unsigned int cr_data = 0;

		/* Select multiple pin,pin55,as WDT output */
		/* Step 1: Select multiple pin,pin55,as WDT output */

		outb_p(SIOCFG2, WDT_INDEX_IO_PORT);

		@@ -102,16 +85,16 @@ pc87413_select_wdt_out (void)

		outb_p(cr_data, WDT_DATA_IO_PORT);


		#ifdef DEBUG
		printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", cr_data);
		printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:"
		" Bit7 to 1: %d\n", cr_data);
		#endif
		}

		static void
		pc87413_enable_swc(void)
		{
		/* Enable SWC functions */

		static inline void pc87413_enable_swc(void)
		{
		unsigned int cr_data=0;

		/* Step 2: Enable SWC functions */
		@@ -130,8 +113,9 @@ pc87413_enable_swc(void)
		#endif
		}

		static unsigned int
		pc87413_get_swc_base(void)
		/* Read SWC I/O base address */

		static inline unsigned int pc87413_get_swc_base(void)
		{
		unsigned int swc_base_addr = 0;
		unsigned char addr_l, addr_h = 0;
		@@ -145,18 +129,19 @@ pc87413_get_swc_base(void)

		addr_l = inb(WDT_DATA_IO_PORT);


		swc_base_addr = (addr_h << 8) + addr_l;

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d, res %d\n", addr_l, addr_h, swc_base_addr);
		printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d,"
		" res %d\n", addr_l, addr_h, swc_base_addr);
		#endif

		return swc_base_addr;
		}

		static void
		pc87413_swc_bank3(unsigned int swc_base_addr)
		/* Select Bank 3 of SWC */

		static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
		{
		/* Step 4: Select Bank3 of SWC */

		@@ -165,11 +150,12 @@ pc87413_swc_bank3(unsigned int swc_base_addr)
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
		#endif

		}

		static void
		pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
		/* Set watchdog timeout to x minutes */

		static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
		char pc87413_time)
		{
		/* Step 5: Programm WDTO, Twd. */

		@@ -180,8 +166,9 @@ pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
		#endif
		}

		static void
		pc87413_enable_wden (unsigned int swc_base_addr)
		/* Enable WDEN */

		static inline void pc87413_enable_wden(unsigned int swc_base_addr)
		{
		/* Step 6: Enable WDEN */

		@@ -192,8 +179,8 @@ pc87413_enable_wden (unsigned int swc_base_addr)
		#endif
		}

		static void
		pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
		/* Enable SW_WD_TREN */
		static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
		{
		/* Enable SW_WD_TREN */

		@@ -204,8 +191,9 @@ pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
		#endif
		}

		static void
		pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
		/* Disable SW_WD_TREN */

		static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
		{
		/* Disable SW_WD_TREN */

		@@ -216,11 +204,10 @@ pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
		#endif
		}

		/* Enable SW_WD_TRG */

		static void
		pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
		static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
		{

		/* Enable SW_WD_TRG */

		outb_p(inb (swc_base_addr + WDCTL) \| 0x80, swc_base_addr + WDCTL);
		@@ -230,10 +217,10 @@ pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
		#endif
		}

		static void
		pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
		{
		/* Disable SW_WD_TRG */

		static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
		{
		/* Disable SW_WD_TRG */

		outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
		@@ -243,127 +230,177 @@ pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
		#endif
		}

		/* -- Higher level functions ------------------------------------*/

		/* Enable the watchdog */

		static void
		pc87413_disable(void)
		static void pc87413_enable(void)
		{
		unsigned int swc_base_addr;

		spin_lock(&io_lock);

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_disable_sw_wd_tren(swc_base_addr);
		pc87413_disable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, 0);
		pc87413_programm_wdto(swc_base_addr, timeout);
		pc87413_enable_wden(swc_base_addr);
		pc87413_enable_sw_wd_tren(swc_base_addr);
		pc87413_enable_sw_wd_trg(swc_base_addr);

		spin_unlock(&io_lock);
		}

		/* Disable the watchdog */

		static void
		pc87413_refresh(char pc87413_time)
		static void pc87413_disable(void)
		{
		unsigned int swc_base_addr;

		spin_lock(&io_lock);

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_disable_sw_wd_tren(swc_base_addr);
		pc87413_disable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, pc87413_time);
		pc87413_enable_wden(swc_base_addr);
		pc87413_enable_sw_wd_tren(swc_base_addr);
		pc87413_enable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, 0);

		spin_unlock(&io_lock);
		}

		/* Refresh the watchdog */

		static void
		pc87413_enable(char pc87413_time)
		static void pc87413_refresh(void)
		{
		unsigned int swc_base_addr;

		spin_lock(&io_lock);

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, pc87413_time);
		pc87413_disable_sw_wd_tren(swc_base_addr);
		pc87413_disable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, timeout);
		pc87413_enable_wden(swc_base_addr);
		pc87413_enable_sw_wd_tren(swc_base_addr);
		pc87413_enable_sw_wd_trg(swc_base_addr);

		spin_unlock(&io_lock);
		}

		/* -- File operations -------------------------------------------*/

		/**
		* pc87413_open:
		* @inode: inode of device
		* @file: file handle to device
		*
		*/

		static int pc87413_open(struct inode inode, struct file file)
		{
		/* /dev/watchdog can only be opened once */

		if (test_and_set_bit(0, &timer_enabled))
		return -EBUSY;

		if (nowayout)
		__module_get(THIS_MODULE);

		/*******************************************
		* Kernel methods.
		*******************************************/
		/* Reload and activate timer */
		pc87413_refresh();

		printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to"
		" %d minute(s).\n", timeout);

		return nonseekable_open(inode, file);
		}

		/**
		* pc87413_status:
		*
		* Extract the status information from a WDT watchdog device. There are
		* several board variants so we have to know which bits are valid. Some
		* bits default to one and some to zero in order to be maximally painful.
		* pc87413_release:
		* @inode: inode to board
		* @file: file handle to board
		*
		* we then map the bits onto the status ioctl flags.
		* The watchdog has a configurable API. There is a religious dispute
		* between people who want their watchdog to be able to shut down and
		* those who want to be sure if the watchdog manager dies the machine
		* reboots. In the former case we disable the counters, in the latter
		* case you have to open it again very soon.
		*/

		static int pc87413_status(void)
		static int pc87413_release(struct inode inode, struct file file)
		{
		/* Not supported */
		/* Shut off the timer. */

		if (expect_close == 42) {
		pc87413_disable();
		printk(KERN_INFO MODNAME "Watchdog disabled,"
		" sleeping again...\n");
		} else {
		printk(KERN_CRIT MODNAME "Unexpected close, not stopping"
		" watchdog!\n");
		pc87413_refresh();
		}

		clear_bit(0, &timer_enabled);
		expect_close = 0;

		return 1;
		return 0;
		}

		static long long pc87413_llseek(struct file *file, long long offset, int origin)
		/**
		* pc87413_status:
		*
		* return, if the watchdog is enabled (timeout is set...)
		*/


		static int pc87413_status(void)
		{
		return -ESPIPE;
		return 1; /* currently not supported */
		}

		/**
		* pc87413_write:
		* @file: file handle to the watchdog
		* @buf: buffer to write (unused as data does not matter here
		* @count: count of bytes
		* @data: data buffer to write
		* @len: length in bytes
		* @ppos: pointer to the position to write. No seeks allowed
		*
		* A write to a watchdog device is defined as a keepalive signal. Any
		* write of data will do, as we we don't define content meaning.
		*/

		static ssize_t
		pc87413_write (struct file file, const char __user buf, size_t count, loff_t *ppos)
		static ssize_t pc87413_write(struct file file, const char __user data,
		size_t len, loff_t *ppos)
		{
		if (count) {
		pc87413_refresh (WD_TIMEOUT);
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Write\n");
		#endif
		/* See if we got the magic character 'V' and reload the timer */
		if (len) {
		if (!nowayout) {
		size_t i;

		/* reset expect flag */
		expect_close = 0;

		/* scan to see whether or not we got the magic character */
		for (i = 0; i != len; i++) {
		char c;
		if (get_user(c, data+i))
		return -EFAULT;
		if (c == 'V')
		expect_close = 42;
		}
		return count;
		}

		/*
		* Read reports the temperature in degrees Fahrenheit.
		*/
		static ssize_t
		pc87413_read(struct file file, char buf, size_t count, loff_t *ptr)
		{

		// char timeout;
		//
		// outb_p(0x08, WDT_EFER); /* Select locical device 8 */
		// outb_p(0x0F6, WDT_EFER); /* Select CRF6 */
		// timeout = inb(WDT_EFDR); /* Read Timeout counter from CRF6 */


		// if(copy_to_user(buf,&timeout,1))
		// return -EFAULT;
		return 1;


		/* someone wrote to us, we should reload the timer */
		pc87413_refresh();
		}
		return len;
		}

		/**
		@@ -378,103 +415,92 @@ pc87413_read(struct file file, char buf, size_t count, loff_t *ptr)
		* querying capabilities and current status.
		*/

		static int
		pc87413_ioctl(struct inode inode, struct file file, unsigned int cmd,
		unsigned long arg)
		{
		static struct watchdog_info ident=
		static int pc87413_ioctl(struct inode inode, struct file file,
		unsigned int cmd, unsigned long arg)
		{
		.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE,
		int new_timeout;

		union {
		struct watchdog_info __user *ident;
		int __user *i;
		} uarg;

		static struct watchdog_info ident = {
		.options = WDIOF_KEEPALIVEPING \|
		WDIOF_SETTIMEOUT \|
		WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = "pc87413(HF/F)"
		.identity = "PC87413(HF/F) watchdog"
		};

		ident.options=1; /* Mask down to the card we have */
		uarg.i = (int __user *)arg;

		switch(cmd)
		{
		switch(cmd) {
		default:
		return -ENOIOCTLCMD;
		return -ENOTTY;

		case WDIOC_GETSUPPORT:
		return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
		return copy_to_user(uarg.ident, &ident,
		sizeof(ident)) ? -EFAULT : 0;

		case WDIOC_GETSTATUS:
		return put_user(pc87413_status(),(int *)arg);
		return put_user(pc87413_status(), uarg.i);

		case WDIOC_GETBOOTSTATUS:
		return put_user(0, (int *)arg);
		return put_user(0, uarg.i);

		case WDIOC_KEEPALIVE:
		pc87413_refresh(WD_TIMEOUT);
		pc87413_refresh();
		#ifdef DEBUG
		printk(KERN_INFO DPFX "keepalive\n");
		#endif
		return 0;
		}
		}

		/**
		* pc87413_open:
		* @inode: inode of device
		* @file: file handle to device
		*
		* One of our two misc devices has been opened. The watchdog device is
		* single open and on opening we load the counters. Counter zero is a
		* 100Hz cascade, into counter 1 which downcounts to reboot. When the
		* counter triggers counter 2 downcounts the length of the reset pulse
		* which set set to be as long as possible.
		*/
		case WDIOC_SETTIMEOUT:
		if (get_user(new_timeout, uarg.i))
		return -EFAULT;

		static int
		pc87413_open(struct inode inode, struct file file)
		{
		switch(MINOR(inode->i_rdev))
		{
		case WATCHDOG_MINOR:
		if(pc87413_is_open)
		return -EBUSY;
		/*
		* Activate
		*/
		// the API states this is given in secs
		new_timeout /= 60;

		pc87413_is_open=1;
		pc87413_refresh(WD_TIMEOUT);
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Open\n");
		#endif
		return 0;
		case TEMP_MINOR:
		return 0;
		default:
		return -ENODEV;
		}
		}
		if (new_timeout < 0 \|\| new_timeout > MAX_TIMEOUT)
		return -EINVAL;

		/**
		* pc87413_close:
		* @inode: inode to board
		* @file: file handle to board
		*
		* The watchdog has a configurable API. There is a religious dispute
		* between people who want their watchdog to be able to shut down and
		* those who want to be sure if the watchdog manager dies the machine
		* reboots. In the former case we disable the counters, in the latter
		* case you have to open it again very soon.
		*/
		timeout = new_timeout;
		pc87413_refresh();

		static int
		pc87413_release(struct inode inode, struct file file)
		{
		if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
		// fall through and return the new timeout...

		case WDIOC_GETTIMEOUT:

		new_timeout = timeout * 60;

		return put_user(new_timeout, uarg.i);

		case WDIOC_SETOPTIONS:
		{
		#ifndef CONFIG_WATCHDOG_NOWAYOUT
		int options, retval = -EINVAL;

		if (get_user(options, uarg.i))
		return -EFAULT;

		if (options & WDIOS_DISABLECARD) {
		pc87413_disable();
		#endif
		pc87413_is_open=0;
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Release\n");
		#endif
		retval = 0;
		}
		return 0;

		if (options & WDIOS_ENABLECARD) {
		pc87413_enable();
		retval = 0;
		}

		return retval;
		}
		}
		}

		/* -- Notifier funtions -----------------------------------------*/

		/**
		* notify_sys:
		* @this: our notifier block
		@@ -487,8 +513,8 @@ pc87413_release(struct inode inode, struct file file)
		* trust me - if it happens it does suck.
		*/

		static int
		pc87413_notify_sys(struct notifier_block *this, unsigned long code,
		static int pc87413_notify_sys(struct notifier_block *this,
		unsigned long code,
		void *unused)
		{
		if (code == SYS_DOWN \|\| code == SYS_HALT)
		@@ -499,22 +525,22 @@ pc87413_notify_sys(struct notifier_block *this, unsigned long code,
		return NOTIFY_DONE;
		}


		/*****************************************************
		* Kernel Interfaces
		*****************************************************/

		/* -- Module's structures ---------------------------------------*/

		static struct file_operations pc87413_fops = {
		.owner = THIS_MODULE,
		.llseek = pc87413_llseek,
		.read = pc87413_read,
		.llseek = no_llseek,
		.write = pc87413_write,
		.ioctl = pc87413_ioctl,
		.open = pc87413_open,
		.release = pc87413_release,
		};

		static struct notifier_block pc87413_notifier =
		{
		.notifier_call = pc87413_notify_sys,
		};

		static struct miscdevice pc87413_miscdev=
		{
		.minor = WATCHDOG_MINOR,
		@@ -522,66 +548,32 @@ static struct miscdevice pc87413_miscdev=
		.fops = &pc87413_fops
		};

		/*
		* The WDT card needs to learn about soft shutdowns in order to
		* turn the timebomb registers off.
		*/

		static struct notifier_block pc87413_notifier=
		{
		pc87413_notify_sys,
		NULL,
		0
		};

		/* -- Module init functions -------------------------------------*/

		/**
		* pc87413_exit:
		*
		* Unload the watchdog. You cannot do this with any file handles open.
		* If your watchdog is set to continue ticking on close and you unload
		* it, well it keeps ticking. We won't get the interrupt but the board
		* will not touch PC memory so all is fine. You just have to load a new
		* module in 60 seconds or reboot.
		*/

		static void
		pc87413_exit(void)
		{
		pc87413_disable();
		misc_deregister(&pc87413_miscdev);
		unregister_reboot_notifier(&pc87413_notifier);
		/* release_region(io,2); */
		}


		/**
		* pc87413_init:
		* pc87413_init: module's "constructor"
		*
		* Set up the WDT watchdog board. All we have to do is grab the
		* resources we require and bitch if anyone beat us to them.
		* The open() function will actually kick the board off.
		*/

		static int
		pc87413_init(void)
		static int __init pc87413_init(void)
		{
		int ret;

		printk(KERN_INFO PFX "Version 1.00 at io 0x%X\n", WDT_INDEX_IO_PORT);
		spin_lock_init(&io_lock);

		printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT);

		/* request_region(io, 2, "pc87413"); */


		ret = register_reboot_notifier(&pc87413_notifier);
		if (ret != 0) {
		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
		ret);
		}



		ret = misc_register(&pc87413_miscdev);

		if (ret != 0) {
		@@ -593,18 +585,52 @@ pc87413_init(void)

		printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout);


		pc87413_enable(WD_TIMEOUT);
		pc87413_enable();

		return 0;
		}

		/**
		* pc87413_exit: module's "destructor"
		*
		* Unload the watchdog. You cannot do this with any file handles open.
		* If your watchdog is set to continue ticking on close and you unload
		* it, well it keeps ticking. We won't get the interrupt but the board
		* will not touch PC memory so all is fine. You just have to load a new
		* module in 60 seconds or reboot.
		*/

		static void __exit pc87413_exit(void)
		{
		/* Stop the timer before we leave */
		if (!nowayout)
		{
		pc87413_disable();
		printk(KERN_INFO MODNAME "Watchdog disabled.\n");
		}

		misc_deregister(&pc87413_miscdev);
		unregister_reboot_notifier(&pc87413_notifier);
		/* release_region(io,2); */

		printk(MODNAME " watchdog component driver removed.\n");
		}

		module_init(pc87413_init);
		module_exit(pc87413_exit);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Sven Anders <anders@anduras.de>");
		MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,");
		MODULE_DESCRIPTION("PC87413 WDT driver");
		MODULE_LICENSE("GPL");

		MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

		module_param(io, int, 0);
		MODULE_PARM_DESC(wdt_io, MODNAME " I/O port (default: " __MODULE_STRING(io) ").");

		module_param(timeout, int, 0);
		MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ").");

		module_param(nowayout, int, 0);
		MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");