V4L/DVB (11649): gspca - m5602: Probe the ov7660 sensor
[linux-2.6] / drivers / watchdog / hpwdt.c
1 /*
2  *      HP WatchDog Driver
3  *      based on
4  *
5  *      SoftDog 0.05:   A Software Watchdog Device
6  *
7  *      (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
8  *      Thomas Mingarelli <thomas.mingarelli@hp.com>
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      version 2 as published by the Free Software Foundation
13  *
14  */
15
16 #include <linux/device.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/irq.h>
22 #include <linux/kernel.h>
23 #include <linux/miscdevice.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/kdebug.h>
27 #include <linux/moduleparam.h>
28 #include <linux/notifier.h>
29 #include <linux/pci.h>
30 #include <linux/pci_ids.h>
31 #include <linux/reboot.h>
32 #include <linux/sched.h>
33 #include <linux/timer.h>
34 #include <linux/types.h>
35 #include <linux/uaccess.h>
36 #include <linux/watchdog.h>
37 #include <linux/dmi.h>
38 #include <linux/efi.h>
39 #include <linux/string.h>
40 #include <linux/bootmem.h>
41 #include <linux/slab.h>
42 #include <asm/desc.h>
43 #include <asm/cacheflush.h>
44
45 #define PCI_BIOS32_SD_VALUE             0x5F32335F      /* "_32_" */
46 #define CRU_BIOS_SIGNATURE_VALUE        0x55524324
47 #define PCI_BIOS32_PARAGRAPH_LEN        16
48 #define PCI_ROM_BASE1                   0x000F0000
49 #define ROM_SIZE                        0x10000
50 #define HPWDT_VERSION                   "1.01"
51
52 struct bios32_service_dir {
53         u32 signature;
54         u32 entry_point;
55         u8 revision;
56         u8 length;
57         u8 checksum;
58         u8 reserved[5];
59 };
60
61 /* type 212 */
62 struct smbios_cru64_info {
63         u8 type;
64         u8 byte_length;
65         u16 handle;
66         u32 signature;
67         u64 physical_address;
68         u32 double_length;
69         u32 double_offset;
70 };
71 #define SMBIOS_CRU64_INFORMATION        212
72
73 struct cmn_registers {
74         union {
75                 struct {
76                         u8 ral;
77                         u8 rah;
78                         u16 rea2;
79                 };
80                 u32 reax;
81         } u1;
82         union {
83                 struct {
84                         u8 rbl;
85                         u8 rbh;
86                         u8 reb2l;
87                         u8 reb2h;
88                 };
89                 u32 rebx;
90         } u2;
91         union {
92                 struct {
93                         u8 rcl;
94                         u8 rch;
95                         u16 rec2;
96                 };
97                 u32 recx;
98         } u3;
99         union {
100                 struct {
101                         u8 rdl;
102                         u8 rdh;
103                         u16 red2;
104                 };
105                 u32 redx;
106         } u4;
107
108         u32 resi;
109         u32 redi;
110         u16 rds;
111         u16 res;
112         u32 reflags;
113 }  __attribute__((packed));
114
115 #define DEFAULT_MARGIN  30
116 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
117 static unsigned int reload;                     /* the computed soft_margin */
118 static int nowayout = WATCHDOG_NOWAYOUT;
119 static char expect_release;
120 static unsigned long hpwdt_is_open;
121 static unsigned int allow_kdump;
122
123 static void __iomem *pci_mem_addr;              /* the PCI-memory address */
124 static unsigned long __iomem *hpwdt_timer_reg;
125 static unsigned long __iomem *hpwdt_timer_con;
126
127 static DEFINE_SPINLOCK(rom_lock);
128
129 static void *cru_rom_addr;
130
131 static struct cmn_registers cmn_regs;
132
133 static struct pci_device_id hpwdt_devices[] = {
134         { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
135         { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
136         {0},                    /* terminate list */
137 };
138 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
139
140 extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
141                                                 unsigned long *pRomEntry);
142
143 #ifndef CONFIG_X86_64
144 /* --32 Bit Bios------------------------------------------------------------ */
145
146 #define HPWDT_ARCH      32
147
148 asm(".text                          \n\t"
149     ".align 4                       \n"
150     "asminline_call:                \n\t"
151     "pushl       %ebp               \n\t"
152     "movl        %esp, %ebp         \n\t"
153     "pusha                          \n\t"
154     "pushf                          \n\t"
155     "push        %es                \n\t"
156     "push        %ds                \n\t"
157     "pop         %es                \n\t"
158     "movl        8(%ebp),%eax       \n\t"
159     "movl        4(%eax),%ebx       \n\t"
160     "movl        8(%eax),%ecx       \n\t"
161     "movl        12(%eax),%edx      \n\t"
162     "movl        16(%eax),%esi      \n\t"
163     "movl        20(%eax),%edi      \n\t"
164     "movl        (%eax),%eax        \n\t"
165     "push        %cs                \n\t"
166     "call        *12(%ebp)          \n\t"
167     "pushf                          \n\t"
168     "pushl       %eax               \n\t"
169     "movl        8(%ebp),%eax       \n\t"
170     "movl        %ebx,4(%eax)       \n\t"
171     "movl        %ecx,8(%eax)       \n\t"
172     "movl        %edx,12(%eax)      \n\t"
173     "movl        %esi,16(%eax)      \n\t"
174     "movl        %edi,20(%eax)      \n\t"
175     "movw        %ds,24(%eax)       \n\t"
176     "movw        %es,26(%eax)       \n\t"
177     "popl        %ebx               \n\t"
178     "movl        %ebx,(%eax)        \n\t"
179     "popl        %ebx               \n\t"
180     "movl        %ebx,28(%eax)      \n\t"
181     "pop         %es                \n\t"
182     "popf                           \n\t"
183     "popa                           \n\t"
184     "leave                          \n\t"
185     "ret                            \n\t"
186     ".previous");
187
188
189 /*
190  *      cru_detect
191  *
192  *      Routine Description:
193  *      This function uses the 32-bit BIOS Service Directory record to
194  *      search for a $CRU record.
195  *
196  *      Return Value:
197  *      0        :  SUCCESS
198  *      <0       :  FAILURE
199  */
200 static int __devinit cru_detect(unsigned long map_entry,
201         unsigned long map_offset)
202 {
203         void *bios32_map;
204         unsigned long *bios32_entrypoint;
205         unsigned long cru_physical_address;
206         unsigned long cru_length;
207         unsigned long physical_bios_base = 0;
208         unsigned long physical_bios_offset = 0;
209         int retval = -ENODEV;
210
211         bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
212
213         if (bios32_map == NULL)
214                 return -ENODEV;
215
216         bios32_entrypoint = bios32_map + map_offset;
217
218         cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
219
220         asminline_call(&cmn_regs, bios32_entrypoint);
221
222         if (cmn_regs.u1.ral != 0) {
223                 printk(KERN_WARNING
224                         "hpwdt: Call succeeded but with an error: 0x%x\n",
225                         cmn_regs.u1.ral);
226         } else {
227                 physical_bios_base = cmn_regs.u2.rebx;
228                 physical_bios_offset = cmn_regs.u4.redx;
229                 cru_length = cmn_regs.u3.recx;
230                 cru_physical_address =
231                         physical_bios_base + physical_bios_offset;
232
233                 /* If the values look OK, then map it in. */
234                 if ((physical_bios_base + physical_bios_offset)) {
235                         cru_rom_addr =
236                                 ioremap(cru_physical_address, cru_length);
237                         if (cru_rom_addr)
238                                 retval = 0;
239                 }
240
241                 printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
242                         physical_bios_base);
243                 printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
244                         physical_bios_offset);
245                 printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
246                         cru_length);
247                 printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
248                         (unsigned int)&cru_rom_addr);
249         }
250         iounmap(bios32_map);
251         return retval;
252 }
253
254 /*
255  *      bios_checksum
256  */
257 static int __devinit bios_checksum(const char __iomem *ptr, int len)
258 {
259         char sum = 0;
260         int i;
261
262         /*
263          * calculate checksum of size bytes. This should add up
264          * to zero if we have a valid header.
265          */
266         for (i = 0; i < len; i++)
267                 sum += ptr[i];
268
269         return ((sum == 0) && (len > 0));
270 }
271
272 /*
273  *      bios32_present
274  *
275  *      Routine Description:
276  *      This function finds the 32-bit BIOS Service Directory
277  *
278  *      Return Value:
279  *      0        :  SUCCESS
280  *      <0       :  FAILURE
281  */
282 static int __devinit bios32_present(const char __iomem *p)
283 {
284         struct bios32_service_dir *bios_32_ptr;
285         int length;
286         unsigned long map_entry, map_offset;
287
288         bios_32_ptr = (struct bios32_service_dir *) p;
289
290         /*
291          * Search for signature by checking equal to the swizzled value
292          * instead of calling another routine to perform a strcmp.
293          */
294         if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
295                 length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
296                 if (bios_checksum(p, length)) {
297                         /*
298                          * According to the spec, we're looking for the
299                          * first 4KB-aligned address below the entrypoint
300                          * listed in the header. The Service Directory code
301                          * is guaranteed to occupy no more than 2 4KB pages.
302                          */
303                         map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
304                         map_offset = bios_32_ptr->entry_point - map_entry;
305
306                         return cru_detect(map_entry, map_offset);
307                 }
308         }
309         return -ENODEV;
310 }
311
312 static int __devinit detect_cru_service(void)
313 {
314         char __iomem *p, *q;
315         int rc = -1;
316
317         /*
318          * Search from 0x0f0000 through 0x0fffff, inclusive.
319          */
320         p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
321         if (p == NULL)
322                 return -ENOMEM;
323
324         for (q = p; q < p + ROM_SIZE; q += 16) {
325                 rc = bios32_present(q);
326                 if (!rc)
327                         break;
328         }
329         iounmap(p);
330         return rc;
331 }
332
333 #else
334 /* --64 Bit Bios------------------------------------------------------------ */
335
336 #define HPWDT_ARCH      64
337
338 asm(".text                      \n\t"
339     ".align 4                   \n"
340     "asminline_call:            \n\t"
341     "pushq      %rbp            \n\t"
342     "movq       %rsp, %rbp      \n\t"
343     "pushq      %rax            \n\t"
344     "pushq      %rbx            \n\t"
345     "pushq      %rdx            \n\t"
346     "pushq      %r12            \n\t"
347     "pushq      %r9             \n\t"
348     "movq       %rsi, %r12      \n\t"
349     "movq       %rdi, %r9       \n\t"
350     "movl       4(%r9),%ebx     \n\t"
351     "movl       8(%r9),%ecx     \n\t"
352     "movl       12(%r9),%edx    \n\t"
353     "movl       16(%r9),%esi    \n\t"
354     "movl       20(%r9),%edi    \n\t"
355     "movl       (%r9),%eax      \n\t"
356     "call       *%r12           \n\t"
357     "pushfq                     \n\t"
358     "popq        %r12           \n\t"
359     "movl       %eax, (%r9)     \n\t"
360     "movl       %ebx, 4(%r9)    \n\t"
361     "movl       %ecx, 8(%r9)    \n\t"
362     "movl       %edx, 12(%r9)   \n\t"
363     "movl       %esi, 16(%r9)   \n\t"
364     "movl       %edi, 20(%r9)   \n\t"
365     "movq       %r12, %rax      \n\t"
366     "movl       %eax, 28(%r9)   \n\t"
367     "popq       %r9             \n\t"
368     "popq       %r12            \n\t"
369     "popq       %rdx            \n\t"
370     "popq       %rbx            \n\t"
371     "popq       %rax            \n\t"
372     "leave                      \n\t"
373     "ret                        \n\t"
374     ".previous");
375
376 /*
377  *      dmi_find_cru
378  *
379  *      Routine Description:
380  *      This function checks whether or not a SMBIOS/DMI record is
381  *      the 64bit CRU info or not
382  */
383 static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
384 {
385         struct smbios_cru64_info *smbios_cru64_ptr;
386         unsigned long cru_physical_address;
387
388         if (dm->type == SMBIOS_CRU64_INFORMATION) {
389                 smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
390                 if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
391                         cru_physical_address =
392                                 smbios_cru64_ptr->physical_address +
393                                 smbios_cru64_ptr->double_offset;
394                         cru_rom_addr = ioremap(cru_physical_address,
395                                 smbios_cru64_ptr->double_length);
396                         set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
397                                 smbios_cru64_ptr->double_length >> PAGE_SHIFT);
398                 }
399         }
400 }
401
402 static int __devinit detect_cru_service(void)
403 {
404         cru_rom_addr = NULL;
405
406         dmi_walk(dmi_find_cru, NULL);
407
408         /* if cru_rom_addr has been set then we found a CRU service */
409         return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
410 }
411
412 /* ------------------------------------------------------------------------- */
413
414 #endif
415
416 /*
417  *      Watchdog operations
418  */
419 static void hpwdt_start(void)
420 {
421         reload = (soft_margin * 1000) / 128;
422         iowrite16(reload, hpwdt_timer_reg);
423         iowrite16(0x85, hpwdt_timer_con);
424 }
425
426 static void hpwdt_stop(void)
427 {
428         unsigned long data;
429
430         data = ioread16(hpwdt_timer_con);
431         data &= 0xFE;
432         iowrite16(data, hpwdt_timer_con);
433 }
434
435 static void hpwdt_ping(void)
436 {
437         iowrite16(reload, hpwdt_timer_reg);
438 }
439
440 static int hpwdt_change_timer(int new_margin)
441 {
442         /* Arbitrary, can't find the card's limits */
443         if (new_margin < 30 || new_margin > 600) {
444                 printk(KERN_WARNING
445                         "hpwdt: New value passed in is invalid: %d seconds.\n",
446                         new_margin);
447                 return -EINVAL;
448         }
449
450         soft_margin = new_margin;
451         printk(KERN_DEBUG
452                 "hpwdt: New timer passed in is %d seconds.\n",
453                 new_margin);
454         reload = (soft_margin * 1000) / 128;
455
456         return 0;
457 }
458
459 /*
460  *      NMI Handler
461  */
462 static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
463                                 void *data)
464 {
465         unsigned long rom_pl;
466         static int die_nmi_called;
467
468         if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
469                 return NOTIFY_OK;
470
471         spin_lock_irqsave(&rom_lock, rom_pl);
472         if (!die_nmi_called)
473                 asminline_call(&cmn_regs, cru_rom_addr);
474         die_nmi_called = 1;
475         spin_unlock_irqrestore(&rom_lock, rom_pl);
476         if (cmn_regs.u1.ral == 0) {
477                 printk(KERN_WARNING "hpwdt: An NMI occurred, "
478                         "but unable to determine source.\n");
479         } else {
480                 if (allow_kdump)
481                         hpwdt_stop();
482                 panic("An NMI occurred, please see the Integrated "
483                         "Management Log for details.\n");
484         }
485
486         return NOTIFY_OK;
487 }
488
489 /*
490  *      /dev/watchdog handling
491  */
492 static int hpwdt_open(struct inode *inode, struct file *file)
493 {
494         /* /dev/watchdog can only be opened once */
495         if (test_and_set_bit(0, &hpwdt_is_open))
496                 return -EBUSY;
497
498         /* Start the watchdog */
499         hpwdt_start();
500         hpwdt_ping();
501
502         return nonseekable_open(inode, file);
503 }
504
505 static int hpwdt_release(struct inode *inode, struct file *file)
506 {
507         /* Stop the watchdog */
508         if (expect_release == 42) {
509                 hpwdt_stop();
510         } else {
511                 printk(KERN_CRIT
512                         "hpwdt: Unexpected close, not stopping watchdog!\n");
513                 hpwdt_ping();
514         }
515
516         expect_release = 0;
517
518         /* /dev/watchdog is being closed, make sure it can be re-opened */
519         clear_bit(0, &hpwdt_is_open);
520
521         return 0;
522 }
523
524 static ssize_t hpwdt_write(struct file *file, const char __user *data,
525         size_t len, loff_t *ppos)
526 {
527         /* See if we got the magic character 'V' and reload the timer */
528         if (len) {
529                 if (!nowayout) {
530                         size_t i;
531
532                         /* note: just in case someone wrote the magic character
533                          * five months ago... */
534                         expect_release = 0;
535
536                         /* scan to see whether or not we got the magic char. */
537                         for (i = 0; i != len; i++) {
538                                 char c;
539                                 if (get_user(c, data + i))
540                                         return -EFAULT;
541                                 if (c == 'V')
542                                         expect_release = 42;
543                         }
544                 }
545
546                 /* someone wrote to us, we should reload the timer */
547                 hpwdt_ping();
548         }
549
550         return len;
551 }
552
553 static struct watchdog_info ident = {
554         .options = WDIOF_SETTIMEOUT |
555                    WDIOF_KEEPALIVEPING |
556                    WDIOF_MAGICCLOSE,
557         .identity = "HP iLO2 HW Watchdog Timer",
558 };
559
560 static long hpwdt_ioctl(struct file *file, unsigned int cmd,
561         unsigned long arg)
562 {
563         void __user *argp = (void __user *)arg;
564         int __user *p = argp;
565         int new_margin;
566         int ret = -ENOTTY;
567
568         switch (cmd) {
569         case WDIOC_GETSUPPORT:
570                 ret = 0;
571                 if (copy_to_user(argp, &ident, sizeof(ident)))
572                         ret = -EFAULT;
573                 break;
574
575         case WDIOC_GETSTATUS:
576         case WDIOC_GETBOOTSTATUS:
577                 ret = put_user(0, p);
578                 break;
579
580         case WDIOC_KEEPALIVE:
581                 hpwdt_ping();
582                 ret = 0;
583                 break;
584
585         case WDIOC_SETTIMEOUT:
586                 ret = get_user(new_margin, p);
587                 if (ret)
588                         break;
589
590                 ret = hpwdt_change_timer(new_margin);
591                 if (ret)
592                         break;
593
594                 hpwdt_ping();
595                 /* Fall */
596         case WDIOC_GETTIMEOUT:
597                 ret = put_user(soft_margin, p);
598                 break;
599         }
600         return ret;
601 }
602
603 /*
604  *      Kernel interfaces
605  */
606 static const struct file_operations hpwdt_fops = {
607         .owner = THIS_MODULE,
608         .llseek = no_llseek,
609         .write = hpwdt_write,
610         .unlocked_ioctl = hpwdt_ioctl,
611         .open = hpwdt_open,
612         .release = hpwdt_release,
613 };
614
615 static struct miscdevice hpwdt_miscdev = {
616         .minor = WATCHDOG_MINOR,
617         .name = "watchdog",
618         .fops = &hpwdt_fops,
619 };
620
621 static struct notifier_block die_notifier = {
622         .notifier_call = hpwdt_pretimeout,
623         .priority = 0x7FFFFFFF,
624 };
625
626 /*
627  *      Init & Exit
628  */
629
630 static int __devinit hpwdt_init_one(struct pci_dev *dev,
631                                         const struct pci_device_id *ent)
632 {
633         int retval;
634
635         /*
636          * First let's find out if we are on an iLO2 server. We will
637          * not run on a legacy ASM box.
638          * So we only support the G5 ProLiant servers and higher.
639          */
640         if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
641                 dev_warn(&dev->dev,
642                         "This server does not have an iLO2 ASIC.\n");
643                 return -ENODEV;
644         }
645
646         if (pci_enable_device(dev)) {
647                 dev_warn(&dev->dev,
648                         "Not possible to enable PCI Device: 0x%x:0x%x.\n",
649                         ent->vendor, ent->device);
650                 return -ENODEV;
651         }
652
653         pci_mem_addr = pci_iomap(dev, 1, 0x80);
654         if (!pci_mem_addr) {
655                 dev_warn(&dev->dev,
656                         "Unable to detect the iLO2 server memory.\n");
657                 retval = -ENOMEM;
658                 goto error_pci_iomap;
659         }
660         hpwdt_timer_reg = pci_mem_addr + 0x70;
661         hpwdt_timer_con = pci_mem_addr + 0x72;
662
663         /* Make sure that we have a valid soft_margin */
664         if (hpwdt_change_timer(soft_margin))
665                 hpwdt_change_timer(DEFAULT_MARGIN);
666
667         /*
668          * We need to map the ROM to get the CRU service.
669          * For 32 bit Operating Systems we need to go through the 32 Bit
670          * BIOS Service Directory
671          * For 64 bit Operating Systems we get that service through SMBIOS.
672          */
673         retval = detect_cru_service();
674         if (retval < 0) {
675                 dev_warn(&dev->dev,
676                         "Unable to detect the %d Bit CRU Service.\n",
677                         HPWDT_ARCH);
678                 goto error_get_cru;
679         }
680
681         /*
682          * We know this is the only CRU call we need to make so lets keep as
683          * few instructions as possible once the NMI comes in.
684          */
685         cmn_regs.u1.rah = 0x0D;
686         cmn_regs.u1.ral = 0x02;
687
688         retval = register_die_notifier(&die_notifier);
689         if (retval != 0) {
690                 dev_warn(&dev->dev,
691                         "Unable to register a die notifier (err=%d).\n",
692                         retval);
693                 goto error_die_notifier;
694         }
695
696         retval = misc_register(&hpwdt_miscdev);
697         if (retval < 0) {
698                 dev_warn(&dev->dev,
699                         "Unable to register miscdev on minor=%d (err=%d).\n",
700                         WATCHDOG_MINOR, retval);
701                 goto error_misc_register;
702         }
703
704         printk(KERN_INFO
705                 "hp Watchdog Timer Driver: %s"
706                 ", timer margin: %d seconds (nowayout=%d)"
707                 ", allow kernel dump: %s (default = 0/OFF).\n",
708                 HPWDT_VERSION, soft_margin, nowayout,
709                 (allow_kdump == 0) ? "OFF" : "ON");
710
711         return 0;
712
713 error_misc_register:
714         unregister_die_notifier(&die_notifier);
715 error_die_notifier:
716         if (cru_rom_addr)
717                 iounmap(cru_rom_addr);
718 error_get_cru:
719         pci_iounmap(dev, pci_mem_addr);
720 error_pci_iomap:
721         pci_disable_device(dev);
722         return retval;
723 }
724
725 static void __devexit hpwdt_exit(struct pci_dev *dev)
726 {
727         if (!nowayout)
728                 hpwdt_stop();
729
730         misc_deregister(&hpwdt_miscdev);
731         unregister_die_notifier(&die_notifier);
732
733         if (cru_rom_addr)
734                 iounmap(cru_rom_addr);
735         pci_iounmap(dev, pci_mem_addr);
736         pci_disable_device(dev);
737 }
738
739 static struct pci_driver hpwdt_driver = {
740         .name = "hpwdt",
741         .id_table = hpwdt_devices,
742         .probe = hpwdt_init_one,
743         .remove = __devexit_p(hpwdt_exit),
744 };
745
746 static void __exit hpwdt_cleanup(void)
747 {
748         pci_unregister_driver(&hpwdt_driver);
749 }
750
751 static int __init hpwdt_init(void)
752 {
753         return pci_register_driver(&hpwdt_driver);
754 }
755
756 MODULE_AUTHOR("Tom Mingarelli");
757 MODULE_DESCRIPTION("hp watchdog driver");
758 MODULE_LICENSE("GPL");
759 MODULE_VERSION(HPWDT_VERSION);
760 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
761
762 module_param(soft_margin, int, 0);
763 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
764
765 module_param(allow_kdump, int, 0);
766 MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
767
768 module_param(nowayout, int, 0);
769 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
770                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
771
772 module_init(hpwdt_init);
773 module_exit(hpwdt_cleanup);