[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / watchdog / machzwd.c

/*
 *  MachZ ZF-Logic Watchdog Timer driver for Linux
 *
 *
 *  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.
 *
 *  The author does NOT admit liability nor provide warranty for
 *  any of this software. This material is provided "AS-IS" in
 *  the hope that it may be useful for others.
 *
 *  Author: Fernando Fuganti <fuganti@conectiva.com.br>
 *
 *  Based on sbc60xxwdt.c by Jakob Oestergaard
 *
 *
 *  We have two timers (wd#1, wd#2) driven by a 32 KHz clock with the
 *  following periods:
 *      wd#1 - 2 seconds;
 *      wd#2 - 7.2 ms;
 *  After the expiration of wd#1, it can generate a NMI, SCI, SMI, or
 *  a system RESET and it starts wd#2 that unconditionaly will RESET
 *  the system when the counter reaches zero.
 *
 *  14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
 *      Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>

/* ports */
#define ZF_IOBASE	0x218
#define INDEX		0x218
#define DATA_B		0x219
#define DATA_W		0x21A
#define DATA_D		0x21A

/* indexes */			/* size */
#define ZFL_VERSION	0x02	/* 16   */
#define CONTROL 	0x10	/* 16   */
#define STATUS		0x12	/* 8    */
#define COUNTER_1	0x0C	/* 16   */
#define COUNTER_2	0x0E	/* 8    */
#define PULSE_LEN	0x0F	/* 8    */

/* controls */
#define ENABLE_WD1	0x0001
#define ENABLE_WD2	0x0002
#define RESET_WD1	0x0010
#define RESET_WD2	0x0020
#define GEN_SCI		0x0100
#define GEN_NMI		0x0200
#define GEN_SMI		0x0400
#define GEN_RESET	0x0800


/* utilities */

#define WD1	0
#define WD2	1

#define zf_writew(port, data)  { outb(port, INDEX); outw(data, DATA_W); }
#define zf_writeb(port, data)  { outb(port, INDEX); outb(data, DATA_B); }
#define zf_get_ZFL_version()   zf_readw(ZFL_VERSION)


static unsigned short zf_readw(unsigned char port)
{
	outb(port, INDEX);
	return inw(DATA_W);
}


MODULE_AUTHOR("Fernando Fuganti <fuganti@conectiva.com.br>");
MODULE_DESCRIPTION("MachZ ZF-Logic Watchdog driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

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) ")");

#define PFX "machzwd"

static struct watchdog_info zf_info = {
	.options		= WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
	.firmware_version	= 1,
	.identity		= "ZF-Logic watchdog",
};


/*
 * action refers to action taken when watchdog resets
 * 0 = GEN_RESET
 * 1 = GEN_SMI
 * 2 = GEN_NMI
 * 3 = GEN_SCI
 * defaults to GEN_RESET (0)
 */
static int action = 0;
module_param(action, int, 0);
MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*)  1 = SMI  2 = NMI  3 = SCI");

static void zf_ping(unsigned long data);

static int zf_action = GEN_RESET;
static unsigned long zf_is_open;
static char zf_expect_close;
static spinlock_t zf_lock;
static spinlock_t zf_port_lock;
static DEFINE_TIMER(zf_timer, zf_ping, 0, 0);
static unsigned long next_heartbeat = 0;


/* timeout for user land heart beat (10 seconds) */
#define ZF_USER_TIMEO (HZ*10)

/* timeout for hardware watchdog (~500ms) */
#define ZF_HW_TIMEO (HZ/2)

/* number of ticks on WD#1 (driven by a 32KHz clock, 2s) */
#define ZF_CTIMEOUT 0xffff

#ifndef ZF_DEBUG
#	define dprintk(format, args...)
#else
#	define dprintk(format, args...) printk(KERN_DEBUG PFX ":%s:%d: " format, __FUNCTION__, __LINE__ , ## args)
#endif


static inline void zf_set_status(unsigned char new)
{
	zf_writeb(STATUS, new);
}


/* CONTROL register functions */

static inline unsigned short zf_get_control(void)
{
	return zf_readw(CONTROL);
}

static inline void zf_set_control(unsigned short new)
{
	zf_writew(CONTROL, new);
}


/* WD#? counter functions */
/*
 *	Just set counter value
 */

static inline void zf_set_timer(unsigned short new, unsigned char n)
{
	switch(n){
		case WD1:
			zf_writew(COUNTER_1, new);
		case WD2:
			zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
		default:
			return;
	}
}

/*
 * stop hardware timer
 */
static void zf_timer_off(void)
{
	unsigned int ctrl_reg = 0;
	unsigned long flags;

	/* stop internal ping */
	del_timer_sync(&zf_timer);

	spin_lock_irqsave(&zf_port_lock, flags);
	/* stop watchdog timer */
	ctrl_reg = zf_get_control();
	ctrl_reg |= (ENABLE_WD1|ENABLE_WD2);	/* disable wd1 and wd2 */
	ctrl_reg &= ~(ENABLE_WD1|ENABLE_WD2);
	zf_set_control(ctrl_reg);
	spin_unlock_irqrestore(&zf_port_lock, flags);

	printk(KERN_INFO PFX ": Watchdog timer is now disabled\n");
}


/*
 * start hardware timer
 */
static void zf_timer_on(void)
{
	unsigned int ctrl_reg = 0;
	unsigned long flags;

	spin_lock_irqsave(&zf_port_lock, flags);

	zf_writeb(PULSE_LEN, 0xff);

	zf_set_timer(ZF_CTIMEOUT, WD1);

	/* user land ping */
	next_heartbeat = jiffies + ZF_USER_TIMEO;

	/* start the timer for internal ping */
	mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);

	/* start watchdog timer */
	ctrl_reg = zf_get_control();
	ctrl_reg |= (ENABLE_WD1|zf_action);
	zf_set_control(ctrl_reg);
	spin_unlock_irqrestore(&zf_port_lock, flags);

	printk(KERN_INFO PFX ": Watchdog timer is now enabled\n");
}


static void zf_ping(unsigned long data)
{
	unsigned int ctrl_reg = 0;
	unsigned long flags;

	zf_writeb(COUNTER_2, 0xff);

	if(time_before(jiffies, next_heartbeat)){

		dprintk("time_before: %ld\n", next_heartbeat - jiffies);

		/*
		 * reset event is activated by transition from 0 to 1 on
		 * RESET_WD1 bit and we assume that it is already zero...
		 */

		spin_lock_irqsave(&zf_port_lock, flags);
		ctrl_reg = zf_get_control();
		ctrl_reg |= RESET_WD1;
		zf_set_control(ctrl_reg);

		/* ...and nothing changes until here */
		ctrl_reg &= ~(RESET_WD1);
		zf_set_control(ctrl_reg);
		spin_unlock_irqrestore(&zf_port_lock, flags);

		mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);
	}else{
		printk(KERN_CRIT PFX ": I will reset your machine\n");
	}
}

static ssize_t zf_write(struct file *file, const char __user *buf, size_t count,
								loff_t *ppos)
{
	/* See if we got the magic character */
	if(count){

		/*
		 * no need to check for close confirmation
		 * no way to disable watchdog ;)
		 */
		if (!nowayout) {
			size_t ofs;

			/*
			 * note: just in case someone wrote the magic character
			 * five months ago...
			 */
			zf_expect_close = 0;

			/* now scan */
			for (ofs = 0; ofs != count; ofs++){
				char c;
				if (get_user(c, buf + ofs))
					return -EFAULT;
				if (c == 'V'){
					zf_expect_close = 42;
					dprintk("zf_expect_close = 42\n");
				}
			}
		}

		/*
		 * Well, anyhow someone wrote to us,
		 * we should return that favour
		 */
		next_heartbeat = jiffies + ZF_USER_TIMEO;
		dprintk("user ping at %ld\n", jiffies);

	}

	return count;
}

static int zf_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &zf_info, sizeof(zf_info)))
			return -EFAULT;
		break;

	case WDIOC_GETSTATUS:
		return put_user(0, p);

	case WDIOC_KEEPALIVE:
		zf_ping(0);
		break;

	default:
		return -ENOTTY;
	}

	return 0;
}

static int zf_open(struct inode *inode, struct file *file)
{
	spin_lock(&zf_lock);
	if(test_and_set_bit(0, &zf_is_open)) {
		spin_unlock(&zf_lock);
		return -EBUSY;
	}

	if (nowayout)
		__module_get(THIS_MODULE);

	spin_unlock(&zf_lock);

	zf_timer_on();

	return nonseekable_open(inode, file);
}

static int zf_close(struct inode *inode, struct file *file)
{
	if(zf_expect_close == 42){
		zf_timer_off();
	} else {
		del_timer(&zf_timer);
		printk(KERN_ERR PFX ": device file closed unexpectedly. Will not stop the WDT!\n");
	}

	spin_lock(&zf_lock);
	clear_bit(0, &zf_is_open);
	spin_unlock(&zf_lock);

	zf_expect_close = 0;

	return 0;
}

/*
 * Notifier for system down
 */

static int zf_notify_sys(struct notifier_block *this, unsigned long code,
								void *unused)
{
	if(code == SYS_DOWN || code == SYS_HALT){
		zf_timer_off();
	}

	return NOTIFY_DONE;
}


static const struct file_operations zf_fops = {
	.owner          = THIS_MODULE,
	.llseek         = no_llseek,
	.write          = zf_write,
	.ioctl          = zf_ioctl,
	.open           = zf_open,
	.release        = zf_close,
};

static struct miscdevice zf_miscdev = {
	.minor = WATCHDOG_MINOR,
	.name = "watchdog",
	.fops = &zf_fops,
};
 

/*
 * The device needs to learn about soft shutdowns in order to
 * turn the timebomb registers off.
 */
static struct notifier_block zf_notifier = {
	.notifier_call = zf_notify_sys,
};

static void __init zf_show_action(int act)
{
	char *str[] = { "RESET", "SMI", "NMI", "SCI" };

	printk(KERN_INFO PFX ": Watchdog using action = %s\n", str[act]);
}

static int __init zf_init(void)
{
	int ret;

	printk(KERN_INFO PFX ": MachZ ZF-Logic Watchdog driver initializing.\n");

	ret = zf_get_ZFL_version();
	if ((!ret) || (ret == 0xffff)) {
		printk(KERN_WARNING PFX ": no ZF-Logic found\n");
		return -ENODEV;
	}

	if((action <= 3) && (action >= 0)){
		zf_action = zf_action>>action;
	} else
		action = 0;

	zf_show_action(action);

	spin_lock_init(&zf_lock);
	spin_lock_init(&zf_port_lock);

	if(!request_region(ZF_IOBASE, 3, "MachZ ZFL WDT")){
		printk(KERN_ERR "cannot reserve I/O ports at %d\n",
							ZF_IOBASE);
		ret = -EBUSY;
		goto no_region;
	}

	ret = register_reboot_notifier(&zf_notifier);
	if(ret){
		printk(KERN_ERR "can't register reboot notifier (err=%d)\n",
									ret);
		goto no_reboot;
	}

	ret = misc_register(&zf_miscdev);
	if (ret){
		printk(KERN_ERR "can't misc_register on minor=%d\n",
							WATCHDOG_MINOR);
		goto no_misc;
	}

	zf_set_status(0);
	zf_set_control(0);

	return 0;

no_misc:
	unregister_reboot_notifier(&zf_notifier);
no_reboot:
	release_region(ZF_IOBASE, 3);
no_region:
	return ret;
}


static void __exit zf_exit(void)
{
	zf_timer_off();

	misc_deregister(&zf_miscdev);
	unregister_reboot_notifier(&zf_notifier);
	release_region(ZF_IOBASE, 3);
}

module_init(zf_init);
module_exit(zf_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* MachZ ZF-Logic Watchdog Timer driver for Linux
	3	*
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation; either version
	8	* 2 of the License, or (at your option) any later version.
	9	*
	10	* The author does NOT admit liability nor provide warranty for
	11	* any of this software. This material is provided "AS-IS" in
	12	* the hope that it may be useful for others.
	13	*
	14	* Author: Fernando Fuganti <fuganti@conectiva.com.br>
	15	*
	16	* Based on sbc60xxwdt.c by Jakob Oestergaard
	17	*
	18	*
	19	* We have two timers (wd#1, wd#2) driven by a 32 KHz clock with the
	20	* following periods:
	21	* wd#1 - 2 seconds;
	22	* wd#2 - 7.2 ms;
	23	* After the expiration of wd#1, it can generate a NMI, SCI, SMI, or
	24	* a system RESET and it starts wd#2 that unconditionaly will RESET
	25	* the system when the counter reaches zero.
	26	*
	27	* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
	28	* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
	29	*/
	30
1da177e4 LT	31	#include <linux/module.h>
	32	#include <linux/moduleparam.h>
	33	#include <linux/types.h>
	34	#include <linux/timer.h>
	35	#include <linux/jiffies.h>
	36	#include <linux/miscdevice.h>
	37	#include <linux/watchdog.h>
	38	#include <linux/fs.h>
	39	#include <linux/ioport.h>
	40	#include <linux/notifier.h>
	41	#include <linux/reboot.h>
	42	#include <linux/init.h>
	43
	44	#include <asm/io.h>
	45	#include <asm/uaccess.h>
	46	#include <asm/system.h>
	47
	48	/* ports */
	49	#define ZF_IOBASE 0x218
	50	#define INDEX 0x218
	51	#define DATA_B 0x219
	52	#define DATA_W 0x21A
	53	#define DATA_D 0x21A
	54
	55	/* indexes / / size */
	56	#define ZFL_VERSION 0x02 /* 16 */
	57	#define CONTROL 0x10 /* 16 */
	58	#define STATUS 0x12 /* 8 */
	59	#define COUNTER_1 0x0C /* 16 */
	60	#define COUNTER_2 0x0E /* 8 */
	61	#define PULSE_LEN 0x0F /* 8 */
	62
	63	/* controls */
	64	#define ENABLE_WD1 0x0001
	65	#define ENABLE_WD2 0x0002
	66	#define RESET_WD1 0x0010
	67	#define RESET_WD2 0x0020
	68	#define GEN_SCI 0x0100
	69	#define GEN_NMI 0x0200
	70	#define GEN_SMI 0x0400
	71	#define GEN_RESET 0x0800
	72
	73
	74	/* utilities */
	75
	76	#define WD1 0
	77	#define WD2 1
	78
	79	#define zf_writew(port, data) { outb(port, INDEX); outw(data, DATA_W); }
	80	#define zf_writeb(port, data) { outb(port, INDEX); outb(data, DATA_B); }
	81	#define zf_get_ZFL_version() zf_readw(ZFL_VERSION)
	82
	83
	84	static unsigned short zf_readw(unsigned char port)
	85	{
	86	outb(port, INDEX);
	87	return inw(DATA_W);
	88	}
	89
	90
	91	MODULE_AUTHOR("Fernando Fuganti <fuganti@conectiva.com.br>");
	92	MODULE_DESCRIPTION("MachZ ZF-Logic Watchdog driver");
	93	MODULE_LICENSE("GPL");
	94	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
95
4bfdf378	96	static int nowayout = WATCHDOG_NOWAYOUT;
1da177e4	97	module_param(nowayout, int, 0);
bffda5c8	98	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
1da177e4 LT	99
	100	#define PFX "machzwd"
	101
	102	static struct watchdog_info zf_info = {
	103	.options = WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
	104	.firmware_version = 1,
	105	.identity = "ZF-Logic watchdog",
	106	};
	107
	108
	109	/*
	110	* action refers to action taken when watchdog resets
	111	* 0 = GEN_RESET
	112	* 1 = GEN_SMI
	113	* 2 = GEN_NMI
	114	* 3 = GEN_SCI
	115	* defaults to GEN_RESET (0)
	116	*/
	117	static int action = 0;
	118	module_param(action, int, 0);
	119	MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*) 1 = SMI 2 = NMI 3 = SCI");
	120
82eb7c50 JS	121	static void zf_ping(unsigned long data);
82eb7c50 JS	122
1da177e4 LT	123	static int zf_action = GEN_RESET;
	124	static unsigned long zf_is_open;
	125	static char zf_expect_close;
	126	static spinlock_t zf_lock;
	127	static spinlock_t zf_port_lock;
82eb7c50	128	static DEFINE_TIMER(zf_timer, zf_ping, 0, 0);
1da177e4 LT	129	static unsigned long next_heartbeat = 0;
	130
	131
	132	/* timeout for user land heart beat (10 seconds) */
	133	#define ZF_USER_TIMEO (HZ*10)
	134
	135	/* timeout for hardware watchdog (~500ms) */
	136	#define ZF_HW_TIMEO (HZ/2)
	137
	138	/* number of ticks on WD#1 (driven by a 32KHz clock, 2s) */
	139	#define ZF_CTIMEOUT 0xffff
	140
	141	#ifndef ZF_DEBUG
	142	# define dprintk(format, args...)
	143	#else
	144	# define dprintk(format, args...) printk(KERN_DEBUG PFX ":%s:%d: " format, __FUNCTION__, __LINE__ , ## args)
	145	#endif
	146
	147
	148	static inline void zf_set_status(unsigned char new)
	149	{
	150	zf_writeb(STATUS, new);
	151	}
	152
	153
	154	/* CONTROL register functions */
	155
	156	static inline unsigned short zf_get_control(void)
	157	{
	158	return zf_readw(CONTROL);
	159	}
	160
	161	static inline void zf_set_control(unsigned short new)
	162	{
	163	zf_writew(CONTROL, new);
	164	}
	165
	166
	167	/* WD#? counter functions */
	168	/*
	169	* Just set counter value
	170	*/
	171
	172	static inline void zf_set_timer(unsigned short new, unsigned char n)
	173	{
	174	switch(n){
	175	case WD1:
	176	zf_writew(COUNTER_1, new);
	177	case WD2:
	178	zf_writeb(COUNTER_2, new > 0xff ? 0xff : new);
	179	default:
	180	return;
	181	}
	182	}
	183
	184	/*
	185	* stop hardware timer
	186	*/
	187	static void zf_timer_off(void)
	188	{
	189	unsigned int ctrl_reg = 0;
	190	unsigned long flags;
	191
	192	/* stop internal ping */
193	del_timer_sync(&zf_timer);
194
195	spin_lock_irqsave(&zf_port_lock, flags);
196	/* stop watchdog timer */
197	ctrl_reg = zf_get_control();
198	ctrl_reg \|= (ENABLE_WD1\|ENABLE_WD2); /* disable wd1 and wd2 */
199	ctrl_reg &= ~(ENABLE_WD1\|ENABLE_WD2);
200	zf_set_control(ctrl_reg);
201	spin_unlock_irqrestore(&zf_port_lock, flags);
202
203	printk(KERN_INFO PFX ": Watchdog timer is now disabled\n");
204	}
205
206
207	/*
208	* start hardware timer
209	*/
210	static void zf_timer_on(void)
211	{
212	unsigned int ctrl_reg = 0;
213	unsigned long flags;
214
215	spin_lock_irqsave(&zf_port_lock, flags);
216
217	zf_writeb(PULSE_LEN, 0xff);
218
219	zf_set_timer(ZF_CTIMEOUT, WD1);
220
221	/* user land ping */
222	next_heartbeat = jiffies + ZF_USER_TIMEO;
223
224	/* start the timer for internal ping */
82eb7c50	225	mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);
1da177e4 LT	226
	227	/* start watchdog timer */
	228	ctrl_reg = zf_get_control();
	229	ctrl_reg \|= (ENABLE_WD1\|zf_action);
	230	zf_set_control(ctrl_reg);
	231	spin_unlock_irqrestore(&zf_port_lock, flags);
	232
	233	printk(KERN_INFO PFX ": Watchdog timer is now enabled\n");
	234	}
	235
	236
	237	static void zf_ping(unsigned long data)
	238	{
	239	unsigned int ctrl_reg = 0;
	240	unsigned long flags;
	241
	242	zf_writeb(COUNTER_2, 0xff);
	243
	244	if(time_before(jiffies, next_heartbeat)){
	245
	246	dprintk("time_before: %ld\n", next_heartbeat - jiffies);
	247
	248	/*
	249	* reset event is activated by transition from 0 to 1 on
	250	* RESET_WD1 bit and we assume that it is already zero...
	251	*/
	252
	253	spin_lock_irqsave(&zf_port_lock, flags);
	254	ctrl_reg = zf_get_control();
	255	ctrl_reg \|= RESET_WD1;
	256	zf_set_control(ctrl_reg);
	257
	258	/* ...and nothing changes until here */
	259	ctrl_reg &= ~(RESET_WD1);
	260	zf_set_control(ctrl_reg);
	261	spin_unlock_irqrestore(&zf_port_lock, flags);
	262
82eb7c50	263	mod_timer(&zf_timer, jiffies + ZF_HW_TIMEO);
1da177e4 LT	264	}else{
	265	printk(KERN_CRIT PFX ": I will reset your machine\n");
	266	}
	267	}
	268
	269	static ssize_t zf_write(struct file file, const char __user buf, size_t count,
	270	loff_t *ppos)
	271	{
	272	/* See if we got the magic character */
	273	if(count){
	274
	275	/*
	276	* no need to check for close confirmation
	277	* no way to disable watchdog ;)
	278	*/
	279	if (!nowayout) {
	280	size_t ofs;
	281
	282	/*
	283	* note: just in case someone wrote the magic character
	284	* five months ago...
	285	*/
	286	zf_expect_close = 0;
	287
	288	/* now scan */
	289	for (ofs = 0; ofs != count; ofs++){
	290	char c;
	291	if (get_user(c, buf + ofs))
	292	return -EFAULT;
	293	if (c == 'V'){
	294	zf_expect_close = 42;
	295	dprintk("zf_expect_close = 42\n");
	296	}
	297	}
	298	}
	299
	300	/*
	301	* Well, anyhow someone wrote to us,
	302	* we should return that favour
	303	*/
	304	next_heartbeat = jiffies + ZF_USER_TIMEO;
	305	dprintk("user ping at %ld\n", jiffies);
	306
	307	}
	308
	309	return count;
	310	}
	311
	312	static int zf_ioctl(struct inode inode, struct file file, unsigned int cmd,
	313	unsigned long arg)
	314	{
	315	void __user argp = (void __user )arg;
	316	int __user *p = argp;
bad77057 AM	317	switch (cmd) {
	318	case WDIOC_GETSUPPORT:
	319	if (copy_to_user(argp, &zf_info, sizeof(zf_info)))
	320	return -EFAULT;
	321	break;
1da177e4	322
bad77057 AM	323	case WDIOC_GETSTATUS:
bad77057 AM	324	return put_user(0, p);
1da177e4	325
bad77057 AM	326	case WDIOC_KEEPALIVE:
	327	zf_ping(0);
	328	break;
1da177e4	329
bad77057 AM	330	default:
bad77057 AM	331	return -ENOTTY;
1da177e4 LT	332	}
	333
	334	return 0;
	335	}
	336
	337	static int zf_open(struct inode inode, struct file file)
	338	{
	339	spin_lock(&zf_lock);
	340	if(test_and_set_bit(0, &zf_is_open)) {
	341	spin_unlock(&zf_lock);
	342	return -EBUSY;
	343	}
	344
	345	if (nowayout)
	346	__module_get(THIS_MODULE);
	347
	348	spin_unlock(&zf_lock);
	349
	350	zf_timer_on();
	351
	352	return nonseekable_open(inode, file);
	353	}
	354
	355	static int zf_close(struct inode inode, struct file file)
	356	{
	357	if(zf_expect_close == 42){
	358	zf_timer_off();
	359	} else {
	360	del_timer(&zf_timer);
	361	printk(KERN_ERR PFX ": device file closed unexpectedly. Will not stop the WDT!\n");
	362	}
	363
	364	spin_lock(&zf_lock);
	365	clear_bit(0, &zf_is_open);
	366	spin_unlock(&zf_lock);
	367
	368	zf_expect_close = 0;
	369
	370	return 0;
	371	}
	372
	373	/*
	374	* Notifier for system down
	375	*/
	376
	377	static int zf_notify_sys(struct notifier_block *this, unsigned long code,
	378	void *unused)
	379	{
	380	if(code == SYS_DOWN \|\| code == SYS_HALT){
	381	zf_timer_off();
	382	}
	383
	384	return NOTIFY_DONE;
	385	}
	386
	387
	388
	389
62322d25	390	static const struct file_operations zf_fops = {
1da177e4 LT	391	.owner = THIS_MODULE,
	392	.llseek = no_llseek,
	393	.write = zf_write,
	394	.ioctl = zf_ioctl,
	395	.open = zf_open,
	396	.release = zf_close,
	397	};
	398
	399	static struct miscdevice zf_miscdev = {
	400	.minor = WATCHDOG_MINOR,
	401	.name = "watchdog",
	402	.fops = &zf_fops,
	403	};
	404
	405
	406	/*
	407	* The device needs to learn about soft shutdowns in order to
	408	* turn the timebomb registers off.
	409	*/
	410	static struct notifier_block zf_notifier = {
	411	.notifier_call = zf_notify_sys,
	412	};
	413
	414	static void __init zf_show_action(int act)
	415	{
	416	char *str[] = { "RESET", "SMI", "NMI", "SCI" };
	417
	418	printk(KERN_INFO PFX ": Watchdog using action = %s\n", str[act]);
	419	}
	420
	421	static int __init zf_init(void)
	422	{
	423	int ret;
	424
	425	printk(KERN_INFO PFX ": MachZ ZF-Logic Watchdog driver initializing.\n");
	426
	427	ret = zf_get_ZFL_version();
11dc1019	428	if ((!ret) \|\| (ret == 0xffff)) {
1da177e4 LT	429	printk(KERN_WARNING PFX ": no ZF-Logic found\n");
	430	return -ENODEV;
	431	}
	432
	433	if((action <= 3) && (action >= 0)){
	434	zf_action = zf_action>>action;
	435	} else
	436	action = 0;
	437
	438	zf_show_action(action);
	439
	440	spin_lock_init(&zf_lock);
	441	spin_lock_init(&zf_port_lock);
	442
1da177e4 LT	443	if(!request_region(ZF_IOBASE, 3, "MachZ ZFL WDT")){
	444	printk(KERN_ERR "cannot reserve I/O ports at %d\n",
	445	ZF_IOBASE);
	446	ret = -EBUSY;
	447	goto no_region;
	448	}
	449
	450	ret = register_reboot_notifier(&zf_notifier);
	451	if(ret){
	452	printk(KERN_ERR "can't register reboot notifier (err=%d)\n",
	453	ret);
	454	goto no_reboot;
	455	}
	456
fb8f7ba0 AD	457	ret = misc_register(&zf_miscdev);
	458	if (ret){
	459	printk(KERN_ERR "can't misc_register on minor=%d\n",
	460	WATCHDOG_MINOR);
	461	goto no_misc;
	462	}
	463
1da177e4 LT	464	zf_set_status(0);
	465	zf_set_control(0);
	466
1da177e4 LT	467	return 0;
1da177e4 LT	468
fb8f7ba0 AD	469	no_misc:
fb8f7ba0 AD	470	unregister_reboot_notifier(&zf_notifier);
1da177e4 LT	471	no_reboot:
	472	release_region(ZF_IOBASE, 3);
	473	no_region:
1da177e4 LT	474	return ret;
	475	}
	476
	477
	478	static void __exit zf_exit(void)
	479	{
	480	zf_timer_off();
	481
	482	misc_deregister(&zf_miscdev);
	483	unregister_reboot_notifier(&zf_notifier);
	484	release_region(ZF_IOBASE, 3);
	485	}
	486
	487	module_init(zf_init);
	488	module_exit(zf_exit);