1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *	Berkshire PCI-PC Watchdog Card Driver
4 *
5 *	(c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
6 *
7 *	Based on source code of the following authors:
8 *	  Ken Hollis <kenji@bitgate.com>,
9 *	  Lindsay Harris <lindsay@bluegum.com>,
10 *	  Alan Cox <alan@lxorguk.ukuu.org.uk>,
11 *	  Matt Domsch <Matt_Domsch@dell.com>,
12 *	  Rob Radez <rob@osinvestor.com>
13 *
14 *	Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
15 *	provide warranty for any of this software. This material is
16 *	provided "AS-IS" and at no charge.
17 */
18
19/*
20 *	A bells and whistles driver is available from:
21 *	http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
22 *
23 *	More info available at
24 *	http://www.berkprod.com/ or http://www.pcwatchdog.com/
25 */
26
27/*
28 *	Includes, defines, variables, module parameters, ...
29 */
30
31#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
32
33#include <linux/module.h>	/* For module specific items */
34#include <linux/moduleparam.h>	/* For new moduleparam's */
35#include <linux/types.h>	/* For standard types (like size_t) */
36#include <linux/errno.h>	/* For the -ENODEV/... values */
37#include <linux/kernel.h>	/* For printk/panic/... */
38#include <linux/delay.h>	/* For mdelay function */
39#include <linux/miscdevice.h>	/* For struct miscdevice */
40#include <linux/watchdog.h>	/* For the watchdog specific items */
41#include <linux/notifier.h>	/* For notifier support */
42#include <linux/reboot.h>	/* For reboot_notifier stuff */
43#include <linux/init.h>		/* For __init/__exit/... */
44#include <linux/fs.h>		/* For file operations */
45#include <linux/pci.h>		/* For pci functions */
46#include <linux/ioport.h>	/* For io-port access */
47#include <linux/spinlock.h>	/* For spin_lock/spin_unlock/... */
48#include <linux/uaccess.h>	/* For copy_to_user/put_user/... */
49#include <linux/io.h>		/* For inb/outb/... */
50
51/* Module and version information */
52#define WATCHDOG_VERSION "1.03"
53#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
54#define WATCHDOG_NAME "pcwd_pci"
55#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION
56
57/* Stuff for the PCI ID's  */
58#ifndef PCI_VENDOR_ID_QUICKLOGIC
59#define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
60#endif
61
62#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
63#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
64#endif
65
66/*
67 * These are the defines that describe the control status bits for the
68 * PCI-PC Watchdog card.
69 */
70/* Port 1 : Control Status #1 */
71#define WD_PCI_WTRP		0x01	/* Watchdog Trip status */
72#define WD_PCI_HRBT		0x02	/* Watchdog Heartbeat */
73#define WD_PCI_TTRP		0x04	/* Temperature Trip status */
74#define WD_PCI_RL2A		0x08	/* Relay 2 Active */
75#define WD_PCI_RL1A		0x10	/* Relay 1 Active */
76#define WD_PCI_R2DS		0x40	/* Relay 2 Disable Temperature-trip /
77									reset */
78#define WD_PCI_RLY2		0x80	/* Activate Relay 2 on the board */
79/* Port 2 : Control Status #2 */
80#define WD_PCI_WDIS		0x10	/* Watchdog Disable */
81#define WD_PCI_ENTP		0x20	/* Enable Temperature Trip Reset */
82#define WD_PCI_WRSP		0x40	/* Watchdog wrote response */
83#define WD_PCI_PCMD		0x80	/* PC has sent command */
84
85/* according to documentation max. time to process a command for the pci
86 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
87#define PCI_COMMAND_TIMEOUT	150
88
89/* Watchdog's internal commands */
90#define CMD_GET_STATUS				0x04
91#define CMD_GET_FIRMWARE_VERSION		0x08
92#define CMD_READ_WATCHDOG_TIMEOUT		0x18
93#define CMD_WRITE_WATCHDOG_TIMEOUT		0x19
94#define CMD_GET_CLEAR_RESET_COUNT		0x84
95
96/* Watchdog's Dip Switch heartbeat values */
97static const int heartbeat_tbl[] = {
98	5,	/* OFF-OFF-OFF	=  5 Sec  */
99	10,	/* OFF-OFF-ON	= 10 Sec  */
100	30,	/* OFF-ON-OFF	= 30 Sec  */
101	60,	/* OFF-ON-ON	=  1 Min  */
102	300,	/* ON-OFF-OFF	=  5 Min  */
103	600,	/* ON-OFF-ON	= 10 Min  */
104	1800,	/* ON-ON-OFF	= 30 Min  */
105	3600,	/* ON-ON-ON	=  1 hour */
106};
107
108/* We can only use 1 card due to the /dev/watchdog restriction */
109static int cards_found;
110
111/* internal variables */
112static int temp_panic;
113static unsigned long is_active;
114static char expect_release;
115/* this is private data for each PCI-PC watchdog card */
116static struct {
117	/* Wether or not the card has a temperature device */
118	int supports_temp;
119	/* The card's boot status */
120	int boot_status;
121	/* The cards I/O address */
122	unsigned long io_addr;
123	/* the lock for io operations */
124	spinlock_t io_lock;
125	/* the PCI-device */
126	struct pci_dev *pdev;
127} pcipcwd_private;
128
129/* module parameters */
130#define QUIET	0	/* Default */
131#define VERBOSE	1	/* Verbose */
132#define DEBUG	2	/* print fancy stuff too */
133static int debug = QUIET;
134module_param(debug, int, 0);
135MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
136
137#define WATCHDOG_HEARTBEAT 0	/* default heartbeat =
138						delay-time from dip-switches */
139static int heartbeat = WATCHDOG_HEARTBEAT;
140module_param(heartbeat, int, 0);
141MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
142	"(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
143				__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
144
145static bool nowayout = WATCHDOG_NOWAYOUT;
146module_param(nowayout, bool, 0);
147MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
148					__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
149
150/*
151 *	Internal functions
152 */
153
154static int send_command(int cmd, int *msb, int *lsb)
155{
156	int got_response, count;
157
158	if (debug >= DEBUG)
159		pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
160			 cmd, *msb, *lsb);
161
162	spin_lock(&pcipcwd_private.io_lock);
163	/* If a command requires data it should be written first.
164	 * Data for commands with 8 bits of data should be written to port 4.
165	 * Commands with 16 bits of data, should be written as LSB to port 4
166	 * and MSB to port 5.
167	 * After the required data has been written then write the command to
168	 * port 6. */
169	outb_p(*lsb, pcipcwd_private.io_addr + 4);
170	outb_p(*msb, pcipcwd_private.io_addr + 5);
171	outb_p(cmd, pcipcwd_private.io_addr + 6);
172
173	/* wait till the pci card processed the command, signaled by
174	 * the WRSP bit in port 2 and give it a max. timeout of
175	 * PCI_COMMAND_TIMEOUT to process */
176	got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
177	for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
178								count++) {
179		mdelay(1);
180		got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
181	}
182
183	if (debug >= DEBUG) {
184		if (got_response) {
185			pr_debug("time to process command was: %d ms\n",
186				 count);
187		} else {
188			pr_debug("card did not respond on command!\n");
189		}
190	}
191
192	if (got_response) {
193		/* read back response */
194		*lsb = inb_p(pcipcwd_private.io_addr + 4);
195		*msb = inb_p(pcipcwd_private.io_addr + 5);
196
197		/* clear WRSP bit */
198		inb_p(pcipcwd_private.io_addr + 6);
199
200		if (debug >= DEBUG)
201			pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
202				 cmd, *msb, *lsb);
203	}
204
205	spin_unlock(&pcipcwd_private.io_lock);
206
207	return got_response;
208}
209
210static inline void pcipcwd_check_temperature_support(void)
211{
212	if (inb_p(pcipcwd_private.io_addr) != 0xF0)
213		pcipcwd_private.supports_temp = 1;
214}
215
216static int pcipcwd_get_option_switches(void)
217{
218	int option_switches;
219
220	option_switches = inb_p(pcipcwd_private.io_addr + 3);
221	return option_switches;
222}
223
224static void pcipcwd_show_card_info(void)
225{
226	int got_fw_rev, fw_rev_major, fw_rev_minor;
227	char fw_ver_str[20];		/* The cards firmware version */
228	int option_switches;
229
230	got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
231								&fw_rev_minor);
232	if (got_fw_rev)
233		sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
234	else
235		sprintf(fw_ver_str, "<card no answer>");
236
237	/* Get switch settings */
238	option_switches = pcipcwd_get_option_switches();
239
240	pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n",
241		(int) pcipcwd_private.io_addr, fw_ver_str,
242		(pcipcwd_private.supports_temp ? "with" : "without"));
243
244	pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
245		option_switches,
246		((option_switches & 0x10) ? "ON" : "OFF"),
247		((option_switches & 0x08) ? "ON" : "OFF"));
248
249	if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
250		pr_info("Previous reset was caused by the Watchdog card\n");
251
252	if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
253		pr_info("Card sensed a CPU Overheat\n");
254
255	if (pcipcwd_private.boot_status == 0)
256		pr_info("No previous trip detected - Cold boot or reset\n");
257}
258
259static int pcipcwd_start(void)
260{
261	int stat_reg;
262
263	spin_lock(&pcipcwd_private.io_lock);
264	outb_p(0x00, pcipcwd_private.io_addr + 3);
265	udelay(1000);
266
267	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
268	spin_unlock(&pcipcwd_private.io_lock);
269
270	if (stat_reg & WD_PCI_WDIS) {
271		pr_err("Card timer not enabled\n");
272		return -1;
273	}
274
275	if (debug >= VERBOSE)
276		pr_debug("Watchdog started\n");
277
278	return 0;
279}
280
281static int pcipcwd_stop(void)
282{
283	int stat_reg;
284
285	spin_lock(&pcipcwd_private.io_lock);
286	outb_p(0xA5, pcipcwd_private.io_addr + 3);
287	udelay(1000);
288
289	outb_p(0xA5, pcipcwd_private.io_addr + 3);
290	udelay(1000);
291
292	stat_reg = inb_p(pcipcwd_private.io_addr + 2);
293	spin_unlock(&pcipcwd_private.io_lock);
294
295	if (!(stat_reg & WD_PCI_WDIS)) {
296		pr_err("Card did not acknowledge disable attempt\n");
297		return -1;
298	}
299
300	if (debug >= VERBOSE)
301		pr_debug("Watchdog stopped\n");
302
303	return 0;
304}
305
306static int pcipcwd_keepalive(void)
307{
308	/* Re-trigger watchdog by writing to port 0 */
309	spin_lock(&pcipcwd_private.io_lock);
310	outb_p(0x42, pcipcwd_private.io_addr);	/* send out any data */
311	spin_unlock(&pcipcwd_private.io_lock);
312
313	if (debug >= DEBUG)
314		pr_debug("Watchdog keepalive signal send\n");
315
316	return 0;
317}
318
319static int pcipcwd_set_heartbeat(int t)
320{
321	int t_msb = t / 256;
322	int t_lsb = t % 256;
323
324	if ((t < 0x0001) || (t > 0xFFFF))
325		return -EINVAL;
326
327	/* Write new heartbeat to watchdog */
328	send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
329
330	heartbeat = t;
331	if (debug >= VERBOSE)
332		pr_debug("New heartbeat: %d\n", heartbeat);
333
334	return 0;
335}
336
337static int pcipcwd_get_status(int *status)
338{
339	int control_status;
340
341	*status = 0;
342	control_status = inb_p(pcipcwd_private.io_addr + 1);
343	if (control_status & WD_PCI_WTRP)
344		*status |= WDIOF_CARDRESET;
345	if (control_status & WD_PCI_TTRP) {
346		*status |= WDIOF_OVERHEAT;
347		if (temp_panic)
348			panic(KBUILD_MODNAME ": Temperature overheat trip!\n");
349	}
350
351	if (debug >= DEBUG)
352		pr_debug("Control Status #1: 0x%02x\n", control_status);
353
354	return 0;
355}
356
357static int pcipcwd_clear_status(void)
358{
359	int control_status;
360	int msb;
361	int reset_counter;
362
363	if (debug >= VERBOSE)
364		pr_info("clearing watchdog trip status & LED\n");
365
366	control_status = inb_p(pcipcwd_private.io_addr + 1);
367
368	if (debug >= DEBUG) {
369		pr_debug("status was: 0x%02x\n", control_status);
370		pr_debug("sending: 0x%02x\n",
371			 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
372	}
373
374	/* clear trip status & LED and keep mode of relay 2 */
375	outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
376						pcipcwd_private.io_addr + 1);
377
378	/* clear reset counter */
379	msb = 0;
380	reset_counter = 0xff;
381	send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
382
383	if (debug >= DEBUG) {
384		pr_debug("reset count was: 0x%02x\n", reset_counter);
385	}
386
387	return 0;
388}
389
390static int pcipcwd_get_temperature(int *temperature)
391{
392	*temperature = 0;
393	if (!pcipcwd_private.supports_temp)
394		return -ENODEV;
395
396	spin_lock(&pcipcwd_private.io_lock);
397	*temperature = inb_p(pcipcwd_private.io_addr);
398	spin_unlock(&pcipcwd_private.io_lock);
399
400	/*
401	 * Convert celsius to fahrenheit, since this was
402	 * the decided 'standard' for this return value.
403	 */
404	*temperature = (*temperature * 9 / 5) + 32;
405
406	if (debug >= DEBUG) {
407		pr_debug("temperature is: %d F\n", *temperature);
408	}
409
410	return 0;
411}
412
413static int pcipcwd_get_timeleft(int *time_left)
414{
415	int msb;
416	int lsb;
417
418	/* Read the time that's left before rebooting */
419	/* Note: if the board is not yet armed then we will read 0xFFFF */
420	send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
421
422	*time_left = (msb << 8) + lsb;
423
424	if (debug >= VERBOSE)
425		pr_debug("Time left before next reboot: %d\n", *time_left);
426
427	return 0;
428}
429
430/*
431 *	/dev/watchdog handling
432 */
433
434static ssize_t pcipcwd_write(struct file *file, const char __user *data,
435			     size_t len, loff_t *ppos)
436{
437	/* See if we got the magic character 'V' and reload the timer */
438	if (len) {
439		if (!nowayout) {
440			size_t i;
441
442			/* note: just in case someone wrote the magic character
443			 * five months ago... */
444			expect_release = 0;
445
446			/* scan to see whether or not we got the
447			 * magic character */
448			for (i = 0; i != len; i++) {
449				char c;
450				if (get_user(c, data + i))
451					return -EFAULT;
452				if (c == 'V')
453					expect_release = 42;
454			}
455		}
456
457		/* someone wrote to us, we should reload the timer */
458		pcipcwd_keepalive();
459	}
460	return len;
461}
462
463static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
464						unsigned long arg)
465{
466	void __user *argp = (void __user *)arg;
467	int __user *p = argp;
468	static const struct watchdog_info ident = {
469		.options =		WDIOF_OVERHEAT |
470					WDIOF_CARDRESET |
471					WDIOF_KEEPALIVEPING |
472					WDIOF_SETTIMEOUT |
473					WDIOF_MAGICCLOSE,
474		.firmware_version =	1,
475		.identity =		WATCHDOG_DRIVER_NAME,
476	};
477
478	switch (cmd) {
479	case WDIOC_GETSUPPORT:
480		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
481
482	case WDIOC_GETSTATUS:
483	{
484		int status;
485		pcipcwd_get_status(&status);
486		return put_user(status, p);
487	}
488
489	case WDIOC_GETBOOTSTATUS:
490		return put_user(pcipcwd_private.boot_status, p);
491
492	case WDIOC_GETTEMP:
493	{
494		int temperature;
495
496		if (pcipcwd_get_temperature(&temperature))
497			return -EFAULT;
498
499		return put_user(temperature, p);
500	}
501
502	case WDIOC_SETOPTIONS:
503	{
504		int new_options, retval = -EINVAL;
505
506		if (get_user(new_options, p))
507			return -EFAULT;
508
509		if (new_options & WDIOS_DISABLECARD) {
510			if (pcipcwd_stop())
511				return -EIO;
512			retval = 0;
513		}
514
515		if (new_options & WDIOS_ENABLECARD) {
516			if (pcipcwd_start())
517				return -EIO;
518			retval = 0;
519		}
520
521		if (new_options & WDIOS_TEMPPANIC) {
522			temp_panic = 1;
523			retval = 0;
524		}
525
526		return retval;
527	}
528
529	case WDIOC_KEEPALIVE:
530		pcipcwd_keepalive();
531		return 0;
532
533	case WDIOC_SETTIMEOUT:
534	{
535		int new_heartbeat;
536
537		if (get_user(new_heartbeat, p))
538			return -EFAULT;
539
540		if (pcipcwd_set_heartbeat(new_heartbeat))
541			return -EINVAL;
542
543		pcipcwd_keepalive();
544	}
545		fallthrough;
546
547	case WDIOC_GETTIMEOUT:
548		return put_user(heartbeat, p);
549
550	case WDIOC_GETTIMELEFT:
551	{
552		int time_left;
553
554		if (pcipcwd_get_timeleft(&time_left))
555			return -EFAULT;
556
557		return put_user(time_left, p);
558	}
559
560	default:
561		return -ENOTTY;
562	}
563}
564
565static int pcipcwd_open(struct inode *inode, struct file *file)
566{
567	/* /dev/watchdog can only be opened once */
568	if (test_and_set_bit(0, &is_active)) {
569		if (debug >= VERBOSE)
570			pr_err("Attempt to open already opened device\n");
571		return -EBUSY;
572	}
573
574	/* Activate */
575	pcipcwd_start();
576	pcipcwd_keepalive();
577	return stream_open(inode, file);
578}
579
580static int pcipcwd_release(struct inode *inode, struct file *file)
581{
582	/*
583	 *      Shut off the timer.
584	 */
585	if (expect_release == 42) {
586		pcipcwd_stop();
587	} else {
588		pr_crit("Unexpected close, not stopping watchdog!\n");
589		pcipcwd_keepalive();
590	}
591	expect_release = 0;
592	clear_bit(0, &is_active);
593	return 0;
594}
595
596/*
597 *	/dev/temperature handling
598 */
599
600static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
601				size_t len, loff_t *ppos)
602{
603	int temperature;
604
605	if (pcipcwd_get_temperature(&temperature))
606		return -EFAULT;
607
608	if (copy_to_user(data, &temperature, 1))
609		return -EFAULT;
610
611	return 1;
612}
613
614static int pcipcwd_temp_open(struct inode *inode, struct file *file)
615{
616	if (!pcipcwd_private.supports_temp)
617		return -ENODEV;
618
619	return stream_open(inode, file);
620}
621
622static int pcipcwd_temp_release(struct inode *inode, struct file *file)
623{
624	return 0;
625}
626
627/*
628 *	Notify system
629 */
630
631static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
632								void *unused)
633{
634	if (code == SYS_DOWN || code == SYS_HALT)
635		pcipcwd_stop();	/* Turn the WDT off */
636
637	return NOTIFY_DONE;
638}
639
640/*
641 *	Kernel Interfaces
642 */
643
644static const struct file_operations pcipcwd_fops = {
645	.owner =	THIS_MODULE,
646	.llseek =	no_llseek,
647	.write =	pcipcwd_write,
648	.unlocked_ioctl = pcipcwd_ioctl,
649	.compat_ioctl = compat_ptr_ioctl,
650	.open =		pcipcwd_open,
651	.release =	pcipcwd_release,
652};
653
654static struct miscdevice pcipcwd_miscdev = {
655	.minor =	WATCHDOG_MINOR,
656	.name =		"watchdog",
657	.fops =		&pcipcwd_fops,
658};
659
660static const struct file_operations pcipcwd_temp_fops = {
661	.owner =	THIS_MODULE,
662	.llseek =	no_llseek,
663	.read =		pcipcwd_temp_read,
664	.open =		pcipcwd_temp_open,
665	.release =	pcipcwd_temp_release,
666};
667
668static struct miscdevice pcipcwd_temp_miscdev = {
669	.minor =	TEMP_MINOR,
670	.name =		"temperature",
671	.fops =		&pcipcwd_temp_fops,
672};
673
674static struct notifier_block pcipcwd_notifier = {
675	.notifier_call =	pcipcwd_notify_sys,
676};
677
678/*
679 *	Init & exit routines
680 */
681
682static int pcipcwd_card_init(struct pci_dev *pdev,
683		const struct pci_device_id *ent)
684{
685	int ret = -EIO;
686
687	cards_found++;
688	if (cards_found == 1)
689		pr_info("%s\n", DRIVER_VERSION);
690
691	if (cards_found > 1) {
692		pr_err("This driver only supports 1 device\n");
693		return -ENODEV;
694	}
695
696	if (pci_enable_device(pdev)) {
697		pr_err("Not possible to enable PCI Device\n");
698		return -ENODEV;
699	}
700
701	if (pci_resource_start(pdev, 0) == 0x0000) {
702		pr_err("No I/O-Address for card detected\n");
703		ret = -ENODEV;
704		goto err_out_disable_device;
705	}
706
707	spin_lock_init(&pcipcwd_private.io_lock);
708	pcipcwd_private.pdev = pdev;
709	pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
710
711	if (pci_request_regions(pdev, WATCHDOG_NAME)) {
712		pr_err("I/O address 0x%04x already in use\n",
713		       (int) pcipcwd_private.io_addr);
714		ret = -EIO;
715		goto err_out_disable_device;
716	}
717
718	/* get the boot_status */
719	pcipcwd_get_status(&pcipcwd_private.boot_status);
720
721	/* clear the "card caused reboot" flag */
722	pcipcwd_clear_status();
723
724	/* disable card */
725	pcipcwd_stop();
726
727	/* Check whether or not the card supports the temperature device */
728	pcipcwd_check_temperature_support();
729
730	/* Show info about the card itself */
731	pcipcwd_show_card_info();
732
733	/* If heartbeat = 0 then we use the heartbeat from the dip-switches */
734	if (heartbeat == 0)
735		heartbeat =
736			heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
737
738	/* Check that the heartbeat value is within it's range ;
739	 * if not reset to the default */
740	if (pcipcwd_set_heartbeat(heartbeat)) {
741		pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
742		pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
743			WATCHDOG_HEARTBEAT);
744	}
745
746	ret = register_reboot_notifier(&pcipcwd_notifier);
747	if (ret != 0) {
748		pr_err("cannot register reboot notifier (err=%d)\n", ret);
749		goto err_out_release_region;
750	}
751
752	if (pcipcwd_private.supports_temp) {
753		ret = misc_register(&pcipcwd_temp_miscdev);
754		if (ret != 0) {
755			pr_err("cannot register miscdev on minor=%d (err=%d)\n",
756			       TEMP_MINOR, ret);
757			goto err_out_unregister_reboot;
758		}
759	}
760
761	ret = misc_register(&pcipcwd_miscdev);
762	if (ret != 0) {
763		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
764		       WATCHDOG_MINOR, ret);
765		goto err_out_misc_deregister;
766	}
767
768	pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
769		heartbeat, nowayout);
770
771	return 0;
772
773err_out_misc_deregister:
774	if (pcipcwd_private.supports_temp)
775		misc_deregister(&pcipcwd_temp_miscdev);
776err_out_unregister_reboot:
777	unregister_reboot_notifier(&pcipcwd_notifier);
778err_out_release_region:
779	pci_release_regions(pdev);
780err_out_disable_device:
781	pci_disable_device(pdev);
782	return ret;
783}
784
785static void pcipcwd_card_exit(struct pci_dev *pdev)
786{
787	/* Stop the timer before we leave */
788	if (!nowayout)
789		pcipcwd_stop();
790
791	/* Deregister */
792	misc_deregister(&pcipcwd_miscdev);
793	if (pcipcwd_private.supports_temp)
794		misc_deregister(&pcipcwd_temp_miscdev);
795	unregister_reboot_notifier(&pcipcwd_notifier);
796	pci_release_regions(pdev);
797	pci_disable_device(pdev);
798	cards_found--;
799}
800
801static const struct pci_device_id pcipcwd_pci_tbl[] = {
802	{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
803		PCI_ANY_ID, PCI_ANY_ID, },
804	{ 0 },			/* End of list */
805};
806MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
807
808static struct pci_driver pcipcwd_driver = {
809	.name		= WATCHDOG_NAME,
810	.id_table	= pcipcwd_pci_tbl,
811	.probe		= pcipcwd_card_init,
812	.remove		= pcipcwd_card_exit,
813};
814
815module_pci_driver(pcipcwd_driver);
816
817MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
818MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
819MODULE_LICENSE("GPL");
820