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Commit dfc7bd9c authored by Andrew Victor's avatar Andrew Victor Committed by Wim Van Sebroeck
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[WATCHDOG] convert AT91RM9200 watchdog to platform driver 



Converted to a platform driver.
Added suspend/resume support - the watchdog is disabled during the
sleep states.

Original patch from David Brownell.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
parent 58b519f3

drivers/char/watchdog/at91_wdt.c

+71 −11
Original line number Diff line number Diff line
@@ -17,14 +17,15 @@ 
#include <linux/miscdevice.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/platform_device.h>

#include <linux/types.h>

#include <linux/watchdog.h>

#include <asm/bitops.h>

#include <asm/uaccess.h>





#define WDT_DEFAULT_TIME	5	/* 5 seconds */

#define WDT_MAX_TIME		256	/* 256 seconds */

#define WDT_DEFAULT_TIME	5	/* seconds */

#define WDT_MAX_TIME		256	/* seconds */



static int wdt_time = WDT_DEFAULT_TIME;

static int nowayout = WATCHDOG_NOWAYOUT;
@@ -32,8 +33,10 @@ static int nowayout = WATCHDOG_NOWAYOUT; 
module_param(wdt_time, int, 0);

MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");



#ifdef CONFIG_WATCHDOG_NOWAYOUT

module_param(nowayout, int, 0);

MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

#endif





static unsigned long at91wdt_busy;
@@ -196,27 +199,84 @@ static struct miscdevice at91wdt_miscdev = { 
	.fops		= &at91wdt_fops,

};



static int __init at91_wdt_init(void)

static int __init at91wdt_probe(struct platform_device *pdev)

{

	int res;



	/* Check that the heartbeat value is within range; if not reset to the default */

	if (at91_wdt_settimeout(wdt_time)) {

		at91_wdt_settimeout(WDT_DEFAULT_TIME);

		printk(KERN_INFO "at91_wdt: wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time);

	}

	if (at91wdt_miscdev.dev)

		return -EBUSY;

	at91wdt_miscdev.dev = &pdev->dev;



	res = misc_register(&at91wdt_miscdev);

	if (res)

		return res;



	printk("AT91 Watchdog Timer enabled (%d seconds, nowayout=%d)\n", wdt_time, nowayout);

	printk("AT91 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : "");

	return 0;

}



static int __exit at91wdt_remove(struct platform_device *pdev)

{

	int res;



	res = misc_deregister(&at91wdt_miscdev);

	if (!res)

		at91wdt_miscdev.dev = NULL;



	return res;

}



static void at91wdt_shutdown(struct platform_device *pdev)

{

	at91_wdt_stop();

}



#ifdef CONFIG_PM



static int at91wdt_suspend(struct platform_device *pdev, pm_message_t message)

{

	at91_wdt_stop();

	return 0;

}



static int at91wdt_resume(struct platform_device *pdev)

{

	if (at91wdt_busy)

		at91_wdt_start();

		return 0;

}



#else

#define at91wdt_suspend NULL

#define at91wdt_resume	NULL

#endif



static struct platform_driver at91wdt_driver = {

	.probe		= at91wdt_probe,

	.remove		= __exit_p(at91wdt_remove),

	.shutdown	= at91wdt_shutdown,

	.suspend	= at91wdt_suspend,

	.resume		= at91wdt_resume,

	.driver		= {

		.name	= "at91_wdt",

		.owner	= THIS_MODULE,

	},

};



static int __init at91_wdt_init(void)

{

	/* Check that the heartbeat value is within range; if not reset to the default */

	if (at91_wdt_settimeout(wdt_time)) {

		at91_wdt_settimeout(WDT_DEFAULT_TIME);

		pr_info("at91_wdt: wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time);

	}



	return platform_driver_register(&at91wdt_driver);

}



static void __exit at91_wdt_exit(void)

{

	misc_deregister(&at91wdt_miscdev);

	platform_driver_unregister(&at91wdt_driver);

}



module_init(at91_wdt_init);