[mirror_ubuntu-hirsute-kernel.git] / drivers / char / watchdog / at32ap700x_wdt.c

/*
 * Watchdog driver for Atmel AT32AP700X devices
 *
 * Copyright (C) 2005-2006 Atmel Corporation
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#define TIMEOUT_MIN		1
#define TIMEOUT_MAX		2
#define TIMEOUT_DEFAULT		TIMEOUT_MAX

/* module parameters */
static int timeout =  TIMEOUT_DEFAULT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
		"Timeout value. Limited to be 1 or 2 seconds. (default="
		__MODULE_STRING(TIMEOUT_DEFAULT) ")");

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

/* Watchdog registers and write/read macro */
#define WDT_CTRL		0x00
#define WDT_CTRL_EN		   0
#define WDT_CTRL_PSEL		   8
#define WDT_CTRL_KEY		  24

#define WDT_CLR			0x04

#define WDT_BIT(name)		(1 << WDT_##name)
#define WDT_BF(name, value)	((value) << WDT_##name)

#define wdt_readl(dev, reg)				\
	__raw_readl((dev)->regs + WDT_##reg)
#define wdt_writel(dev, reg, value)			\
	__raw_writel((value), (dev)->regs + WDT_##reg)

struct wdt_at32ap700x {
	void __iomem		*regs;
	int			timeout;
	int			users;
	struct miscdevice	miscdev;
};

static struct wdt_at32ap700x *wdt;
static char expect_release;

/*
 * Disable the watchdog.
 */
static inline void at32_wdt_stop(void)
{
	unsigned long psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0x55));
	wdt_writel(wdt, CTRL, psel | WDT_BF(CTRL_KEY, 0xaa));
}

/*
 * Enable and reset the watchdog.
 */
static inline void at32_wdt_start(void)
{
	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;

	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
			| WDT_BF(CTRL_PSEL, psel)
			| WDT_BF(CTRL_KEY, 0x55));
	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
			| WDT_BF(CTRL_PSEL, psel)
			| WDT_BF(CTRL_KEY, 0xaa));
}

/*
 * Pat the watchdog timer.
 */
static inline void at32_wdt_pat(void)
{
	wdt_writel(wdt, CLR, 0x42);
}

/*
 * Watchdog device is opened, and watchdog starts running.
 */
static int at32_wdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(1, &wdt->users))
		return -EBUSY;

	at32_wdt_start();
	return nonseekable_open(inode, file);
}

/*
 * Close the watchdog device.
 */
static int at32_wdt_close(struct inode *inode, struct file *file)
{
	if (expect_release == 42) {
		at32_wdt_stop();
	} else {
		dev_dbg(wdt->miscdev.parent,
			"Unexpected close, not stopping watchdog!\n");
		at32_wdt_pat();
	}
	clear_bit(1, &wdt->users);
	expect_release = 0;
	return 0;
}

/*
 * Change the watchdog time interval.
 */
static int at32_wdt_settimeout(int time)
{
	/*
	 * All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
	 * 2 ^ 16 allowing up to 2 seconds timeout.
	 */
	if ((time < TIMEOUT_MIN) || (time > TIMEOUT_MAX))
		return -EINVAL;

	/*
	 * Set new watchdog time. It will be used when at32_wdt_start() is
	 * called.
	 */
	wdt->timeout = time;
	return 0;
}

static struct watchdog_info at32_wdt_info = {
	.identity	= "at32ap700x watchdog",
	.options	= WDIOF_SETTIMEOUT |
			  WDIOF_KEEPALIVEPING |
			  WDIOF_MAGICCLOSE,
};

/*
 * Handle commands from user-space.
 */
static int at32_wdt_ioctl(struct inode *inode, struct file *file,
		unsigned int cmd, unsigned long arg)
{
	int ret = -ENOTTY;
	int time;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;

	switch (cmd) {
	case WDIOC_KEEPALIVE:
		at32_wdt_pat();
		ret = 0;
		break;
	case WDIOC_GETSUPPORT:
		ret = copy_to_user(argp, &at32_wdt_info,
				sizeof(at32_wdt_info)) ? -EFAULT : 0;
		break;
	case WDIOC_SETTIMEOUT:
		ret = get_user(time, p);
		if (ret)
			break;
		ret = at32_wdt_settimeout(time);
		if (ret)
			break;
		/* Enable new time value */
		at32_wdt_start();
		/* fall through */
	case WDIOC_GETTIMEOUT:
		ret = put_user(wdt->timeout, p);
		break;
	case WDIOC_GETSTATUS: /* fall through */
	case WDIOC_GETBOOTSTATUS:
		ret = put_user(0, p);
		break;
	case WDIOC_SETOPTIONS:
		ret = get_user(time, p);
		if (ret)
			break;
		if (time & WDIOS_DISABLECARD)
			at32_wdt_stop();
		if (time & WDIOS_ENABLECARD)
			at32_wdt_start();
		ret = 0;
		break;
	}

	return ret;
}

static ssize_t at32_wdt_write(struct file *file, const char __user *data,
				size_t len, loff_t *ppos)
{
	/* See if we got the magic character 'V' and reload the timer */
	if (len) {
		if (!nowayout) {
			size_t i;

			/*
			 * note: just in case someone wrote the magic
			 * character five months ago...
			 */
			expect_release = 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_release = 42;
			}
		}
		/* someone wrote to us, we should pat the watchdog */
		at32_wdt_pat();
	}
	return len;
}

static const struct file_operations at32_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.ioctl		= at32_wdt_ioctl,
	.open		= at32_wdt_open,
	.release	= at32_wdt_close,
	.write		= at32_wdt_write,
};

static int __init at32_wdt_probe(struct platform_device *pdev)
{
	struct resource	*regs;
	int ret;

	if (wdt) {
		dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
		return -EBUSY;
	}

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs) {
		dev_dbg(&pdev->dev, "missing mmio resource\n");
		return -ENXIO;
	}

	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
	if (!wdt) {
		dev_dbg(&pdev->dev, "no memory for wdt structure\n");
		return -ENOMEM;
	}

	wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
	if (!wdt->regs) {
		ret = -ENOMEM;
		dev_dbg(&pdev->dev, "could not map I/O memory\n");
		goto err_free;
	}
	wdt->users = 0;
	wdt->miscdev.minor = WATCHDOG_MINOR;
	wdt->miscdev.name = "watchdog";
	wdt->miscdev.fops = &at32_wdt_fops;

	if (at32_wdt_settimeout(timeout)) {
		at32_wdt_settimeout(TIMEOUT_DEFAULT);
		dev_dbg(&pdev->dev,
			"default timeout invalid, set to %d sec.\n",
			TIMEOUT_DEFAULT);
	}

	ret = misc_register(&wdt->miscdev);
	if (ret) {
		dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
		goto err_iounmap;
	}

	platform_set_drvdata(pdev, wdt);
	wdt->miscdev.parent = &pdev->dev;
	dev_info(&pdev->dev,
		"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
		wdt->regs, wdt->timeout, nowayout);

	return 0;

err_iounmap:
	iounmap(wdt->regs);
err_free:
	kfree(wdt);
	wdt = NULL;
	return ret;
}

static int __exit at32_wdt_remove(struct platform_device *pdev)
{
	if (wdt && platform_get_drvdata(pdev) == wdt) {
		/* Stop the timer before we leave */
		if (!nowayout)
			at32_wdt_stop();

		misc_deregister(&wdt->miscdev);
		iounmap(wdt->regs);
		kfree(wdt);
		wdt = NULL;
		platform_set_drvdata(pdev, NULL);
	}

	return 0;
}

static void at32_wdt_shutdown(struct platform_device *pdev)
{
	at32_wdt_stop();
}

#ifdef CONFIG_PM
static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
{
	at32_wdt_stop();
	return 0;
}

static int at32_wdt_resume(struct platform_device *pdev)
{
	if (wdt->users)
		at32_wdt_start();
	return 0;
}
#else
#define at32_wdt_suspend NULL
#define at32_wdt_resume NULL
#endif

static struct platform_driver at32_wdt_driver = {
	.remove		= __exit_p(at32_wdt_remove),
	.suspend	= at32_wdt_suspend,
	.resume		= at32_wdt_resume,
	.driver		= {
		.name	= "at32_wdt",
		.owner	= THIS_MODULE,
	},
	.shutdown	= at32_wdt_shutdown,
};

static int __init at32_wdt_init(void)
{
	return platform_driver_probe(&at32_wdt_driver, at32_wdt_probe);
}
module_init(at32_wdt_init);

static void __exit at32_wdt_exit(void)
{
	platform_driver_unregister(&at32_wdt_driver);
}
module_exit(at32_wdt_exit);

MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
a9cb3959 HCE	1	/*
	2	* Watchdog driver for Atmel AT32AP700X devices
	3	*
	4	* Copyright (C) 2005-2006 Atmel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/miscdevice.h>
	16	#include <linux/fs.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/watchdog.h>
c37f2713 AM	19	#include <linux/uaccess.h>
c37f2713 AM	20	#include <linux/io.h>
a9cb3959 HCE	21
a9cb3959 HCE	22	#define TIMEOUT_MIN 1
a9cb3959	23	#define TIMEOUT_MAX 2
726c9f61 WVS	24	#define TIMEOUT_DEFAULT TIMEOUT_MAX
	25
	26	/* module parameters */
	27	static int timeout = TIMEOUT_DEFAULT;
	28	module_param(timeout, int, 0);
	29	MODULE_PARM_DESC(timeout,
	30	"Timeout value. Limited to be 1 or 2 seconds. (default="
	31	__MODULE_STRING(TIMEOUT_DEFAULT) ")");
a9cb3959	32
28401140 WVS	33	static int nowayout = WATCHDOG_NOWAYOUT;
	34	module_param(nowayout, int, 0);
	35	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	36	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	37
a9cb3959 HCE	38	/* Watchdog registers and write/read macro */
	39	#define WDT_CTRL 0x00
	40	#define WDT_CTRL_EN 0
	41	#define WDT_CTRL_PSEL 8
	42	#define WDT_CTRL_KEY 24
	43
	44	#define WDT_CLR 0x04
	45
	46	#define WDT_BIT(name) (1 << WDT_##name)
c0ead7e0	47	#define WDT_BF(name, value) ((value) << WDT_##name)
a9cb3959	48
c0ead7e0	49	#define wdt_readl(dev, reg) \
a9cb3959	50	__raw_readl((dev)->regs + WDT_##reg)
c0ead7e0	51	#define wdt_writel(dev, reg, value) \
a9cb3959 HCE	52	__raw_writel((value), (dev)->regs + WDT_##reg)
	53
	54	struct wdt_at32ap700x {
	55	void __iomem *regs;
	56	int timeout;
	57	int users;
	58	struct miscdevice miscdev;
	59	};
	60
	61	static struct wdt_at32ap700x *wdt;
28401140	62	static char expect_release;
a9cb3959 HCE	63
	64	/*
	65	* Disable the watchdog.
	66	*/
c0ead7e0	67	static inline void at32_wdt_stop(void)
a9cb3959 HCE	68	{
	69	unsigned long psel = wdt_readl(wdt, CTRL) & WDT_BF(CTRL_PSEL, 0x0f);
	70	wdt_writel(wdt, CTRL, psel \| WDT_BF(CTRL_KEY, 0x55));
	71	wdt_writel(wdt, CTRL, psel \| WDT_BF(CTRL_KEY, 0xaa));
	72	}
	73
	74	/*
	75	* Enable and reset the watchdog.
	76	*/
c0ead7e0	77	static inline void at32_wdt_start(void)
a9cb3959 HCE	78	{
	79	/* 0xf is 2^16 divider = 2 sec, 0xe is 2^15 divider = 1 sec */
	80	unsigned long psel = (wdt->timeout > 1) ? 0xf : 0xe;
	81
	82	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
	83	\| WDT_BF(CTRL_PSEL, psel)
	84	\| WDT_BF(CTRL_KEY, 0x55));
	85	wdt_writel(wdt, CTRL, WDT_BIT(CTRL_EN)
	86	\| WDT_BF(CTRL_PSEL, psel)
	87	\| WDT_BF(CTRL_KEY, 0xaa));
	88	}
	89
	90	/*
	91	* Pat the watchdog timer.
	92	*/
c0ead7e0	93	static inline void at32_wdt_pat(void)
a9cb3959 HCE	94	{
	95	wdt_writel(wdt, CLR, 0x42);
	96	}
	97
	98	/*
	99	* Watchdog device is opened, and watchdog starts running.
	100	*/
	101	static int at32_wdt_open(struct inode inode, struct file file)
	102	{
	103	if (test_and_set_bit(1, &wdt->users))
	104	return -EBUSY;
	105
	106	at32_wdt_start();
	107	return nonseekable_open(inode, file);
	108	}
	109
	110	/*
28401140	111	* Close the watchdog device.
a9cb3959 HCE	112	*/
	113	static int at32_wdt_close(struct inode inode, struct file file)
	114	{
28401140 WVS	115	if (expect_release == 42) {
	116	at32_wdt_stop();
	117	} else {
	118	dev_dbg(wdt->miscdev.parent,
	119	"Unexpected close, not stopping watchdog!\n");
	120	at32_wdt_pat();
	121	}
a9cb3959	122	clear_bit(1, &wdt->users);
28401140	123	expect_release = 0;
a9cb3959 HCE	124	return 0;
	125	}
	126
	127	/*
	128	* Change the watchdog time interval.
	129	*/
	130	static int at32_wdt_settimeout(int time)
	131	{
	132	/*
	133	* All counting occurs at 1 / SLOW_CLOCK (32 kHz) and max prescaler is
	134	* 2 ^ 16 allowing up to 2 seconds timeout.
	135	*/
	136	if ((time < TIMEOUT_MIN) \|\| (time > TIMEOUT_MAX))
	137	return -EINVAL;
	138
c37f2713 AM	139	/*
	140	* Set new watchdog time. It will be used when at32_wdt_start() is
	141	* called.
	142	*/
a9cb3959 HCE	143	wdt->timeout = time;
	144	return 0;
	145	}
	146
	147	static struct watchdog_info at32_wdt_info = {
	148	.identity = "at32ap700x watchdog",
28401140 WVS	149	.options = WDIOF_SETTIMEOUT \|
	150	WDIOF_KEEPALIVEPING \|
	151	WDIOF_MAGICCLOSE,
a9cb3959 HCE	152	};
	153
	154	/*
	155	* Handle commands from user-space.
	156	*/
	157	static int at32_wdt_ioctl(struct inode inode, struct file file,
	158	unsigned int cmd, unsigned long arg)
	159	{
	160	int ret = -ENOTTY;
	161	int time;
	162	void __user argp = (void __user )arg;
	163	int __user *p = argp;
	164
c37f2713	165	switch (cmd) {
a9cb3959 HCE	166	case WDIOC_KEEPALIVE:
	167	at32_wdt_pat();
	168	ret = 0;
	169	break;
	170	case WDIOC_GETSUPPORT:
	171	ret = copy_to_user(argp, &at32_wdt_info,
	172	sizeof(at32_wdt_info)) ? -EFAULT : 0;
	173	break;
	174	case WDIOC_SETTIMEOUT:
	175	ret = get_user(time, p);
	176	if (ret)
	177	break;
	178	ret = at32_wdt_settimeout(time);
	179	if (ret)
	180	break;
	181	/* Enable new time value */
	182	at32_wdt_start();
	183	/* fall through */
	184	case WDIOC_GETTIMEOUT:
	185	ret = put_user(wdt->timeout, p);
	186	break;
	187	case WDIOC_GETSTATUS: /* fall through */
	188	case WDIOC_GETBOOTSTATUS:
	189	ret = put_user(0, p);
	190	break;
	191	case WDIOC_SETOPTIONS:
	192	ret = get_user(time, p);
	193	if (ret)
	194	break;
	195	if (time & WDIOS_DISABLECARD)
	196	at32_wdt_stop();
	197	if (time & WDIOS_ENABLECARD)
	198	at32_wdt_start();
	199	ret = 0;
	200	break;
	201	}
	202
	203	return ret;
	204	}
	205
28401140 WVS	206	static ssize_t at32_wdt_write(struct file file, const char __user data,
28401140 WVS	207	size_t len, loff_t *ppos)
a9cb3959	208	{
28401140 WVS	209	/* See if we got the magic character 'V' and reload the timer */
	210	if (len) {
	211	if (!nowayout) {
	212	size_t i;
	213
	214	/*
	215	* note: just in case someone wrote the magic
	216	* character five months ago...
	217	*/
	218	expect_release = 0;
	219
	220	/*
	221	* scan to see whether or not we got the magic
	222	* character
	223	*/
	224	for (i = 0; i != len; i++) {
	225	char c;
	226	if (get_user(c, data+i))
	227	return -EFAULT;
	228	if (c == 'V')
	229	expect_release = 42;
	230	}
	231	}
	232	/* someone wrote to us, we should pat the watchdog */
	233	at32_wdt_pat();
	234	}
a9cb3959 HCE	235	return len;
	236	}
	237
	238	static const struct file_operations at32_wdt_fops = {
	239	.owner = THIS_MODULE,
	240	.llseek = no_llseek,
	241	.ioctl = at32_wdt_ioctl,
	242	.open = at32_wdt_open,
	243	.release = at32_wdt_close,
	244	.write = at32_wdt_write,
	245	};
	246
	247	static int __init at32_wdt_probe(struct platform_device *pdev)
	248	{
	249	struct resource *regs;
	250	int ret;
	251
	252	if (wdt) {
	253	dev_dbg(&pdev->dev, "only 1 wdt instance supported.\n");
	254	return -EBUSY;
	255	}
	256
	257	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	258	if (!regs) {
	259	dev_dbg(&pdev->dev, "missing mmio resource\n");
	260	return -ENXIO;
	261	}
	262
	263	wdt = kzalloc(sizeof(struct wdt_at32ap700x), GFP_KERNEL);
	264	if (!wdt) {
	265	dev_dbg(&pdev->dev, "no memory for wdt structure\n");
	266	return -ENOMEM;
	267	}
	268
	269	wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
47d17763 HCE	270	if (!wdt->regs) {
	271	ret = -ENOMEM;
	272	dev_dbg(&pdev->dev, "could not map I/O memory\n");
	273	goto err_free;
	274	}
a9cb3959 HCE	275	wdt->users = 0;
	276	wdt->miscdev.minor = WATCHDOG_MINOR;
	277	wdt->miscdev.name = "watchdog";
	278	wdt->miscdev.fops = &at32_wdt_fops;
	279
726c9f61 WVS	280	if (at32_wdt_settimeout(timeout)) {
726c9f61 WVS	281	at32_wdt_settimeout(TIMEOUT_DEFAULT);
a9cb3959 HCE	282	dev_dbg(&pdev->dev,
a9cb3959 HCE	283	"default timeout invalid, set to %d sec.\n",
726c9f61	284	TIMEOUT_DEFAULT);
a9cb3959 HCE	285	}
	286
	287	ret = misc_register(&wdt->miscdev);
	288	if (ret) {
	289	dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
47d17763	290	goto err_iounmap;
a9cb3959 HCE	291	}
	292
	293	platform_set_drvdata(pdev, wdt);
	294	wdt->miscdev.parent = &pdev->dev;
28401140 WVS	295	dev_info(&pdev->dev,
	296	"AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
	297	wdt->regs, wdt->timeout, nowayout);
a9cb3959 HCE	298
	299	return 0;
	300
47d17763 HCE	301	err_iounmap:
	302	iounmap(wdt->regs);
	303	err_free:
a9cb3959 HCE	304	kfree(wdt);
	305	wdt = NULL;
	306	return ret;
	307	}
	308
	309	static int __exit at32_wdt_remove(struct platform_device *pdev)
	310	{
	311	if (wdt && platform_get_drvdata(pdev) == wdt) {
28401140 WVS	312	/* Stop the timer before we leave */
	313	if (!nowayout)
	314	at32_wdt_stop();
	315
a9cb3959	316	misc_deregister(&wdt->miscdev);
ff732316	317	iounmap(wdt->regs);
a9cb3959 HCE	318	kfree(wdt);
	319	wdt = NULL;
	320	platform_set_drvdata(pdev, NULL);
	321	}
	322
	323	return 0;
	324	}
	325
	326	static void at32_wdt_shutdown(struct platform_device *pdev)
	327	{
	328	at32_wdt_stop();
	329	}
	330
	331	#ifdef CONFIG_PM
	332	static int at32_wdt_suspend(struct platform_device *pdev, pm_message_t message)
	333	{
	334	at32_wdt_stop();
	335	return 0;
	336	}
	337
	338	static int at32_wdt_resume(struct platform_device *pdev)
	339	{
	340	if (wdt->users)
	341	at32_wdt_start();
	342	return 0;
	343	}
97a2a2ea AM	344	#else
	345	#define at32_wdt_suspend NULL
	346	#define at32_wdt_resume NULL
a9cb3959 HCE	347	#endif
	348
	349	static struct platform_driver at32_wdt_driver = {
	350	.remove = __exit_p(at32_wdt_remove),
a9cb3959 HCE	351	.suspend = at32_wdt_suspend,
a9cb3959 HCE	352	.resume = at32_wdt_resume,
a9cb3959 HCE	353	.driver = {
	354	.name = "at32_wdt",
	355	.owner = THIS_MODULE,
	356	},
	357	.shutdown = at32_wdt_shutdown,
	358	};
	359
	360	static int __init at32_wdt_init(void)
	361	{
	362	return platform_driver_probe(&at32_wdt_driver, at32_wdt_probe);
	363	}
	364	module_init(at32_wdt_init);
	365
	366	static void __exit at32_wdt_exit(void)
	367	{
	368	platform_driver_unregister(&at32_wdt_driver);
	369	}
	370	module_exit(at32_wdt_exit);
	371
	372	MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
	373	MODULE_DESCRIPTION("Watchdog driver for Atmel AT32AP700X");
	374	MODULE_LICENSE("GPL");
	375	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);