[linux.git] / drivers / watchdog / ie6xx_wdt.c

/*
 *      Intel Atom E6xx Watchdog driver
 *
 *      Copyright (C) 2011 Alexander Stein
 *                <[email protected]>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of version 2 of the GNU General
 *      Public License as published by the Free Software Foundation.
 *
 *      This program is distributed in the hope that it will be
 *      useful, but WITHOUT ANY WARRANTY; without even the implied
 *      warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *      PURPOSE.  See the GNU General Public License for more details.
 *      You should have received a copy of the GNU General Public
 *      License along with this program; if not, write to the Free
 *      Software Foundation, Inc., 59 Temple Place - Suite 330,
 *      Boston, MA  02111-1307, USA.
 *      The full GNU General Public License is included in this
 *      distribution in the file called COPYING.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/spinlock.h>

#define DRIVER_NAME "ie6xx_wdt"

#define PV1	0x00
#define PV2	0x04

#define RR0	0x0c
#define RR1	0x0d
#define WDT_RELOAD	0x01
#define WDT_TOUT	0x02

#define WDTCR	0x10
#define WDT_PRE_SEL	0x04
#define WDT_RESET_SEL	0x08
#define WDT_RESET_EN	0x10
#define WDT_TOUT_EN	0x20

#define DCR	0x14

#define WDTLR	0x18
#define WDT_LOCK	0x01
#define WDT_ENABLE	0x02
#define WDT_TOUT_CNF	0x03

#define MIN_TIME	1
#define MAX_TIME	(10 * 60) /* 10 minutes */
#define DEFAULT_TIME	60

static unsigned int timeout = DEFAULT_TIME;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout,
		"Default Watchdog timer setting ("
		__MODULE_STRING(DEFAULT_TIME) "s)."
		"The range is from 1 to 600");

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 u8 resetmode = 0x10;
module_param(resetmode, byte, 0);
MODULE_PARM_DESC(resetmode,
	"Resetmode bits: 0x08 warm reset (cold reset otherwise), "
	"0x10 reset enable, 0x20 disable toggle GPIO[4] (default=0x10)");

static struct {
	unsigned short sch_wdtba;
	struct spinlock unlock_sequence;
#ifdef CONFIG_DEBUG_FS
	struct dentry *debugfs;
#endif
} ie6xx_wdt_data;

/*
 * This is needed to write to preload and reload registers
 * struct ie6xx_wdt_data.unlock_sequence must be used
 * to prevent sequence interrupts
 */
static void ie6xx_wdt_unlock_registers(void)
{
	outb(0x80, ie6xx_wdt_data.sch_wdtba + RR0);
	outb(0x86, ie6xx_wdt_data.sch_wdtba + RR0);
}

static int ie6xx_wdt_ping(struct watchdog_device *wdd)
{
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	ie6xx_wdt_unlock_registers();
	outb(WDT_RELOAD, ie6xx_wdt_data.sch_wdtba + RR1);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
	return 0;
}

static int ie6xx_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
{
	u32 preload;
	u64 clock;
	u8 wdtcr;

	/* Watchdog clock is PCI Clock (33MHz) */
	clock = 33000000;
	/* and the preload value is loaded into [34:15] of the down counter */
	preload = (t * clock) >> 15;
	/*
	 * Manual states preload must be one less.
	 * Does not wrap as t is at least 1
	 */
	preload -= 1;

	spin_lock(&ie6xx_wdt_data.unlock_sequence);

	/* Set ResetMode & Enable prescaler for range 10ms to 10 min */
	wdtcr = resetmode & 0x38;
	outb(wdtcr, ie6xx_wdt_data.sch_wdtba + WDTCR);

	ie6xx_wdt_unlock_registers();
	outl(0, ie6xx_wdt_data.sch_wdtba + PV1);

	ie6xx_wdt_unlock_registers();
	outl(preload, ie6xx_wdt_data.sch_wdtba + PV2);

	ie6xx_wdt_unlock_registers();
	outb(WDT_RELOAD | WDT_TOUT, ie6xx_wdt_data.sch_wdtba + RR1);

	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	wdd->timeout = t;
	return 0;
}

static int ie6xx_wdt_start(struct watchdog_device *wdd)
{
	ie6xx_wdt_set_timeout(wdd, wdd->timeout);

	/* Enable the watchdog timer */
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	outb(WDT_ENABLE, ie6xx_wdt_data.sch_wdtba + WDTLR);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	return 0;
}

static int ie6xx_wdt_stop(struct watchdog_device *wdd)
{
	if (inb(ie6xx_wdt_data.sch_wdtba + WDTLR) & WDT_LOCK)
		return -1;

	/* Disable the watchdog timer */
	spin_lock(&ie6xx_wdt_data.unlock_sequence);
	outb(0, ie6xx_wdt_data.sch_wdtba + WDTLR);
	spin_unlock(&ie6xx_wdt_data.unlock_sequence);

	return 0;
}

static const struct watchdog_info ie6xx_wdt_info = {
	.identity =	"Intel Atom E6xx Watchdog",
	.options =	WDIOF_SETTIMEOUT |
			WDIOF_MAGICCLOSE |
			WDIOF_KEEPALIVEPING,
};

static const struct watchdog_ops ie6xx_wdt_ops = {
	.owner =	THIS_MODULE,
	.start =	ie6xx_wdt_start,
	.stop =		ie6xx_wdt_stop,
	.ping =		ie6xx_wdt_ping,
	.set_timeout =	ie6xx_wdt_set_timeout,
};

static struct watchdog_device ie6xx_wdt_dev = {
	.info =		&ie6xx_wdt_info,
	.ops =		&ie6xx_wdt_ops,
	.min_timeout =	MIN_TIME,
	.max_timeout =	MAX_TIME,
};

#ifdef CONFIG_DEBUG_FS

static int ie6xx_wdt_dbg_show(struct seq_file *s, void *unused)
{
	seq_printf(s, "PV1   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + PV1));
	seq_printf(s, "PV2   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + PV2));
	seq_printf(s, "RR    = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + RR0));
	seq_printf(s, "WDTCR = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + WDTCR));
	seq_printf(s, "DCR   = 0x%08x\n",
		inl(ie6xx_wdt_data.sch_wdtba + DCR));
	seq_printf(s, "WDTLR = 0x%08x\n",
		inw(ie6xx_wdt_data.sch_wdtba + WDTLR));

	seq_printf(s, "\n");
	return 0;
}

static int ie6xx_wdt_dbg_open(struct inode *inode, struct file *file)
{
	return single_open(file, ie6xx_wdt_dbg_show, NULL);
}

static const struct file_operations ie6xx_wdt_dbg_operations = {
	.open		= ie6xx_wdt_dbg_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static void __devinit ie6xx_wdt_debugfs_init(void)
{
	/* /sys/kernel/debug/ie6xx_wdt */
	ie6xx_wdt_data.debugfs = debugfs_create_file("ie6xx_wdt",
		S_IFREG | S_IRUGO, NULL, NULL, &ie6xx_wdt_dbg_operations);
}

static void ie6xx_wdt_debugfs_exit(void)
{
	debugfs_remove(ie6xx_wdt_data.debugfs);
}

#else
static void __devinit ie6xx_wdt_debugfs_init(void)
{
}

static void ie6xx_wdt_debugfs_exit(void)
{
}
#endif

static int __devinit ie6xx_wdt_probe(struct platform_device *pdev)
{
	struct resource *res;
	u8 wdtlr;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!res)
		return -ENODEV;

	if (!request_region(res->start, resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",
			(u64)res->start);
		return -EBUSY;
	}

	ie6xx_wdt_data.sch_wdtba = res->start;
	dev_dbg(&pdev->dev, "WDT = 0x%X\n", ie6xx_wdt_data.sch_wdtba);

	ie6xx_wdt_dev.timeout = timeout;
	watchdog_set_nowayout(&ie6xx_wdt_dev, nowayout);

	spin_lock_init(&ie6xx_wdt_data.unlock_sequence);

	wdtlr = inb(ie6xx_wdt_data.sch_wdtba + WDTLR);
	if (wdtlr & WDT_LOCK)
		dev_warn(&pdev->dev,
			"Watchdog Timer is Locked (Reg=0x%x)\n", wdtlr);

	ie6xx_wdt_debugfs_init();

	ret = watchdog_register_device(&ie6xx_wdt_dev);
	if (ret) {
		dev_err(&pdev->dev,
			"Watchdog timer: cannot register device (err =%d)\n",
									ret);
		goto misc_register_error;
	}

	return 0;

misc_register_error:
	ie6xx_wdt_debugfs_exit();
	release_region(res->start, resource_size(res));
	ie6xx_wdt_data.sch_wdtba = 0;
	return ret;
}

static int __devexit ie6xx_wdt_remove(struct platform_device *pdev)
{
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	ie6xx_wdt_stop(NULL);
	watchdog_unregister_device(&ie6xx_wdt_dev);
	ie6xx_wdt_debugfs_exit();
	release_region(res->start, resource_size(res));
	ie6xx_wdt_data.sch_wdtba = 0;

	return 0;
}

static struct platform_driver ie6xx_wdt_driver = {
	.probe		= ie6xx_wdt_probe,
	.remove		= __devexit_p(ie6xx_wdt_remove),
	.driver		= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init ie6xx_wdt_init(void)
{
	/* Check boot parameters to verify that their initial values */
	/* are in range. */
	if ((timeout < MIN_TIME) ||
	    (timeout > MAX_TIME)) {
		pr_err("Watchdog timer: value of timeout %d (dec) "
		  "is out of range from %d to %d (dec)\n",
		  timeout, MIN_TIME, MAX_TIME);
		return -EINVAL;
	}

	return platform_driver_register(&ie6xx_wdt_driver);
}

static void __exit ie6xx_wdt_exit(void)
{
	platform_driver_unregister(&ie6xx_wdt_driver);
}

late_initcall(ie6xx_wdt_init);
module_exit(ie6xx_wdt_exit);

MODULE_AUTHOR("Alexander Stein <[email protected]>");
MODULE_DESCRIPTION("Intel Atom E6xx Watchdog Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
MODULE_ALIAS("platform:" DRIVER_NAME);
Commit	Line	Data
101ce87b AS	1	/*
	2	* Intel Atom E6xx Watchdog driver
	3	*
	4	* Copyright (C) 2011 Alexander Stein
	5	* <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of version 2 of the GNU General
	9	* Public License as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be
	12	* useful, but WITHOUT ANY WARRANTY; without even the implied
	13	* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	14	* PURPOSE. See the GNU General Public License for more details.
	15	* You should have received a copy of the GNU General Public
	16	* License along with this program; if not, write to the Free
	17	* Software Foundation, Inc., 59 Temple Place - Suite 330,
	18	* Boston, MA 02111-1307, USA.
	19	* The full GNU General Public License is included in this
	20	* distribution in the file called COPYING.
	21	*
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/moduleparam.h>
	26	#include <linux/platform_device.h>
491d9e2a	27	#include <linux/io.h>
101ce87b AS	28	#include <linux/kernel.h>
	29	#include <linux/types.h>
	30	#include <linux/watchdog.h>
	31	#include <linux/miscdevice.h>
	32	#include <linux/seq_file.h>
	33	#include <linux/debugfs.h>
	34	#include <linux/uaccess.h>
	35	#include <linux/spinlock.h>
	36
	37	#define DRIVER_NAME "ie6xx_wdt"
	38
	39	#define PV1 0x00
	40	#define PV2 0x04
	41
	42	#define RR0 0x0c
	43	#define RR1 0x0d
	44	#define WDT_RELOAD 0x01
	45	#define WDT_TOUT 0x02
	46
	47	#define WDTCR 0x10
	48	#define WDT_PRE_SEL 0x04
	49	#define WDT_RESET_SEL 0x08
	50	#define WDT_RESET_EN 0x10
	51	#define WDT_TOUT_EN 0x20
	52
	53	#define DCR 0x14
	54
	55	#define WDTLR 0x18
	56	#define WDT_LOCK 0x01
	57	#define WDT_ENABLE 0x02
	58	#define WDT_TOUT_CNF 0x03
	59
	60	#define MIN_TIME 1
	61	#define MAX_TIME (10 * 60) /* 10 minutes */
	62	#define DEFAULT_TIME 60
	63
	64	static unsigned int timeout = DEFAULT_TIME;
	65	module_param(timeout, uint, 0);
	66	MODULE_PARM_DESC(timeout,
	67	"Default Watchdog timer setting ("
	68	__MODULE_STRING(DEFAULT_TIME) "s)."
	69	"The range is from 1 to 600");
	70
	71	static bool nowayout = WATCHDOG_NOWAYOUT;
	72	module_param(nowayout, bool, 0);
	73	MODULE_PARM_DESC(nowayout,
	74	"Watchdog cannot be stopped once started (default="
	75	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	76
	77	static u8 resetmode = 0x10;
	78	module_param(resetmode, byte, 0);
	79	MODULE_PARM_DESC(resetmode,
	80	"Resetmode bits: 0x08 warm reset (cold reset otherwise), "
	81	"0x10 reset enable, 0x20 disable toggle GPIO[4] (default=0x10)");
	82
	83	static struct {
	84	unsigned short sch_wdtba;
	85	struct spinlock unlock_sequence;
	86	#ifdef CONFIG_DEBUG_FS
	87	struct dentry *debugfs;
	88	#endif
	89	} ie6xx_wdt_data;
	90
	91	/*
92	* This is needed to write to preload and reload registers
93	* struct ie6xx_wdt_data.unlock_sequence must be used
94	* to prevent sequence interrupts
95	*/
96	static void ie6xx_wdt_unlock_registers(void)
97	{
98	outb(0x80, ie6xx_wdt_data.sch_wdtba + RR0);
99	outb(0x86, ie6xx_wdt_data.sch_wdtba + RR0);
100	}
101
102	static int ie6xx_wdt_ping(struct watchdog_device *wdd)
103	{
104	spin_lock(&ie6xx_wdt_data.unlock_sequence);
105	ie6xx_wdt_unlock_registers();
106	outb(WDT_RELOAD, ie6xx_wdt_data.sch_wdtba + RR1);
107	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
108	return 0;
109	}
110
111	static int ie6xx_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
112	{
113	u32 preload;
114	u64 clock;
115	u8 wdtcr;
116
117	/* Watchdog clock is PCI Clock (33MHz) */
118	clock = 33000000;
119	/* and the preload value is loaded into [34:15] of the down counter */
120	preload = (t * clock) >> 15;
121	/*
122	* Manual states preload must be one less.
123	* Does not wrap as t is at least 1
124	*/
125	preload -= 1;
126
127	spin_lock(&ie6xx_wdt_data.unlock_sequence);
128
129	/* Set ResetMode & Enable prescaler for range 10ms to 10 min */
130	wdtcr = resetmode & 0x38;
131	outb(wdtcr, ie6xx_wdt_data.sch_wdtba + WDTCR);
132
133	ie6xx_wdt_unlock_registers();
134	outl(0, ie6xx_wdt_data.sch_wdtba + PV1);
135
136	ie6xx_wdt_unlock_registers();
137	outl(preload, ie6xx_wdt_data.sch_wdtba + PV2);
138
139	ie6xx_wdt_unlock_registers();
140	outb(WDT_RELOAD \| WDT_TOUT, ie6xx_wdt_data.sch_wdtba + RR1);
141
142	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
143
144	wdd->timeout = t;
145	return 0;
146	}
147
148	static int ie6xx_wdt_start(struct watchdog_device *wdd)
149	{
150	ie6xx_wdt_set_timeout(wdd, wdd->timeout);
151
152	/* Enable the watchdog timer */
153	spin_lock(&ie6xx_wdt_data.unlock_sequence);
154	outb(WDT_ENABLE, ie6xx_wdt_data.sch_wdtba + WDTLR);
155	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
156
157	return 0;
158	}
159
160	static int ie6xx_wdt_stop(struct watchdog_device *wdd)
161	{
162	if (inb(ie6xx_wdt_data.sch_wdtba + WDTLR) & WDT_LOCK)
163	return -1;
164
165	/* Disable the watchdog timer */
166	spin_lock(&ie6xx_wdt_data.unlock_sequence);
167	outb(0, ie6xx_wdt_data.sch_wdtba + WDTLR);
168	spin_unlock(&ie6xx_wdt_data.unlock_sequence);
169
170	return 0;
171	}
172
173	static const struct watchdog_info ie6xx_wdt_info = {
174	.identity = "Intel Atom E6xx Watchdog",
175	.options = WDIOF_SETTIMEOUT \|
176	WDIOF_MAGICCLOSE \|
177	WDIOF_KEEPALIVEPING,
178	};
179
180	static const struct watchdog_ops ie6xx_wdt_ops = {
181	.owner = THIS_MODULE,
182	.start = ie6xx_wdt_start,
183	.stop = ie6xx_wdt_stop,
184	.ping = ie6xx_wdt_ping,
185	.set_timeout = ie6xx_wdt_set_timeout,
186	};
187
188	static struct watchdog_device ie6xx_wdt_dev = {
189	.info = &ie6xx_wdt_info,
190	.ops = &ie6xx_wdt_ops,
191	.min_timeout = MIN_TIME,
192	.max_timeout = MAX_TIME,
193	};
194
195	#ifdef CONFIG_DEBUG_FS
196
197	static int ie6xx_wdt_dbg_show(struct seq_file s, void unused)
198	{
199	seq_printf(s, "PV1 = 0x%08x\n",
200	inl(ie6xx_wdt_data.sch_wdtba + PV1));
201	seq_printf(s, "PV2 = 0x%08x\n",
202	inl(ie6xx_wdt_data.sch_wdtba + PV2));
203	seq_printf(s, "RR = 0x%08x\n",
204	inw(ie6xx_wdt_data.sch_wdtba + RR0));
205	seq_printf(s, "WDTCR = 0x%08x\n",
206	inw(ie6xx_wdt_data.sch_wdtba + WDTCR));
207	seq_printf(s, "DCR = 0x%08x\n",
208	inl(ie6xx_wdt_data.sch_wdtba + DCR));
209	seq_printf(s, "WDTLR = 0x%08x\n",
210	inw(ie6xx_wdt_data.sch_wdtba + WDTLR));
211
212	seq_printf(s, "\n");
213	return 0;
214	}
215
216	static int ie6xx_wdt_dbg_open(struct inode inode, struct file file)
217	{
218	return single_open(file, ie6xx_wdt_dbg_show, NULL);
219	}
220
221	static const struct file_operations ie6xx_wdt_dbg_operations = {
222	.open = ie6xx_wdt_dbg_open,
223	.read = seq_read,
224	.llseek = seq_lseek,
225	.release = single_release,
226	};
227
228	static void __devinit ie6xx_wdt_debugfs_init(void)
229	{
230	/* /sys/kernel/debug/ie6xx_wdt */
231	ie6xx_wdt_data.debugfs = debugfs_create_file("ie6xx_wdt",
232	S_IFREG \| S_IRUGO, NULL, NULL, &ie6xx_wdt_dbg_operations);
233	}
234
0402450f	235	static void ie6xx_wdt_debugfs_exit(void)
101ce87b AS	236	{
	237	debugfs_remove(ie6xx_wdt_data.debugfs);
	238	}
	239
	240	#else
	241	static void __devinit ie6xx_wdt_debugfs_init(void)
	242	{
	243	}
	244
0402450f	245	static void ie6xx_wdt_debugfs_exit(void)
101ce87b AS	246	{
	247	}
	248	#endif
	249
	250	static int __devinit ie6xx_wdt_probe(struct platform_device *pdev)
	251	{
	252	struct resource *res;
	253	u8 wdtlr;
	254	int ret;
	255
	256	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	257	if (!res)
	258	return -ENODEV;
	259
	260	if (!request_region(res->start, resource_size(res), pdev->name)) {
744f6f4d RD	261	dev_err(&pdev->dev, "Watchdog region 0x%llx already in use!\n",
744f6f4d RD	262	(u64)res->start);
101ce87b AS	263	return -EBUSY;
	264	}
	265
	266	ie6xx_wdt_data.sch_wdtba = res->start;
	267	dev_dbg(&pdev->dev, "WDT = 0x%X\n", ie6xx_wdt_data.sch_wdtba);
	268
	269	ie6xx_wdt_dev.timeout = timeout;
	270	watchdog_set_nowayout(&ie6xx_wdt_dev, nowayout);
	271
	272	spin_lock_init(&ie6xx_wdt_data.unlock_sequence);
	273
	274	wdtlr = inb(ie6xx_wdt_data.sch_wdtba + WDTLR);
	275	if (wdtlr & WDT_LOCK)
	276	dev_warn(&pdev->dev,
	277	"Watchdog Timer is Locked (Reg=0x%x)\n", wdtlr);
	278
	279	ie6xx_wdt_debugfs_init();
	280
	281	ret = watchdog_register_device(&ie6xx_wdt_dev);
	282	if (ret) {
	283	dev_err(&pdev->dev,
	284	"Watchdog timer: cannot register device (err =%d)\n",
	285	ret);
	286	goto misc_register_error;
	287	}
	288
	289	return 0;
	290
	291	misc_register_error:
	292	ie6xx_wdt_debugfs_exit();
	293	release_region(res->start, resource_size(res));
	294	ie6xx_wdt_data.sch_wdtba = 0;
	295	return ret;
	296	}
	297
	298	static int __devexit ie6xx_wdt_remove(struct platform_device *pdev)
	299	{
	300	struct resource *res;
	301
	302	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	303	ie6xx_wdt_stop(NULL);
	304	watchdog_unregister_device(&ie6xx_wdt_dev);
	305	ie6xx_wdt_debugfs_exit();
	306	release_region(res->start, resource_size(res));
	307	ie6xx_wdt_data.sch_wdtba = 0;
	308
	309	return 0;
	310	}
	311
	312	static struct platform_driver ie6xx_wdt_driver = {
	313	.probe = ie6xx_wdt_probe,
	314	.remove = __devexit_p(ie6xx_wdt_remove),
	315	.driver = {
	316	.name = DRIVER_NAME,
	317	.owner = THIS_MODULE,
	318	},
	319	};
	320
	321	static int __init ie6xx_wdt_init(void)
	322	{
	323	/* Check boot parameters to verify that their initial values */
	324	/* are in range. */
	325	if ((timeout < MIN_TIME) \|\|
	326	(timeout > MAX_TIME)) {
327	pr_err("Watchdog timer: value of timeout %d (dec) "
328	"is out of range from %d to %d (dec)\n",
329	timeout, MIN_TIME, MAX_TIME);
330	return -EINVAL;
331	}
332
333	return platform_driver_register(&ie6xx_wdt_driver);
334	}
335
336	static void __exit ie6xx_wdt_exit(void)
337	{
338	platform_driver_unregister(&ie6xx_wdt_driver);
339	}
340
341	late_initcall(ie6xx_wdt_init);
342	module_exit(ie6xx_wdt_exit);
343
344	MODULE_AUTHOR("Alexander Stein <[email protected]>");
345	MODULE_DESCRIPTION("Intel Atom E6xx Watchdog Device Driver");
346	MODULE_LICENSE("GPL");
347	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
348	MODULE_ALIAS("platform:" DRIVER_NAME);