Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Berkshire PCI-PC Watchdog Card Driver | |
3 | * | |
39e3a055 | 4 | * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>. |
1da177e4 LT |
5 | * |
6 | * Based on source code of the following authors: | |
7 | * Ken Hollis <kenji@bitgate.com>, | |
8 | * Lindsay Harris <lindsay@bluegum.com>, | |
9 | * Alan Cox <alan@redhat.com>, | |
10 | * Matt Domsch <Matt_Domsch@dell.com>, | |
11 | * Rob Radez <rob@osinvestor.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or | |
14 | * modify it under the terms of the GNU General Public License | |
15 | * as published by the Free Software Foundation; either version | |
16 | * 2 of the License, or (at your option) any later version. | |
17 | * | |
18 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor | |
19 | * provide warranty for any of this software. This material is | |
20 | * provided "AS-IS" and at no charge. | |
21 | */ | |
22 | ||
23 | /* | |
58b519f3 | 24 | * A bells and whistles driver is available from: |
b3faed63 WVS |
25 | * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ |
26 | * | |
1da177e4 LT |
27 | * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
28 | */ | |
29 | ||
30 | /* | |
31 | * Includes, defines, variables, module parameters, ... | |
32 | */ | |
33 | ||
c315b7e8 WVS |
34 | #include <linux/module.h> /* For module specific items */ |
35 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
36 | #include <linux/types.h> /* For standard types (like size_t) */ | |
37 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
38 | #include <linux/kernel.h> /* For printk/panic/... */ | |
39 | #include <linux/delay.h> /* For mdelay function */ | |
40 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
41 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
42 | #include <linux/notifier.h> /* For notifier support */ | |
43 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
44 | #include <linux/init.h> /* For __init/__exit/... */ | |
45 | #include <linux/fs.h> /* For file operations */ | |
46 | #include <linux/pci.h> /* For pci functions */ | |
47 | #include <linux/ioport.h> /* For io-port access */ | |
48 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
49 | ||
50 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ | |
51 | #include <asm/io.h> /* For inb/outb/... */ | |
1da177e4 LT |
52 | |
53 | /* Module and version information */ | |
39e3a055 | 54 | #define WATCHDOG_VERSION "1.03" |
bffda5c8 | 55 | #define WATCHDOG_DATE "21 Jan 2007" |
1da177e4 LT |
56 | #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" |
57 | #define WATCHDOG_NAME "pcwd_pci" | |
58 | #define PFX WATCHDOG_NAME ": " | |
59 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" | |
60 | ||
61 | /* Stuff for the PCI ID's */ | |
62 | #ifndef PCI_VENDOR_ID_QUICKLOGIC | |
63 | #define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 | |
64 | #endif | |
65 | ||
66 | #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD | |
67 | #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 | |
68 | #endif | |
69 | ||
70 | /* | |
71 | * These are the defines that describe the control status bits for the | |
72 | * PCI-PC Watchdog card. | |
73 | */ | |
a0800f6d WVS |
74 | /* Port 1 : Control Status #1 */ |
75 | #define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ | |
76 | #define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ | |
77 | #define WD_PCI_TTRP 0x04 /* Temperature Trip status */ | |
78 | #define WD_PCI_RL2A 0x08 /* Relay 2 Active */ | |
79 | #define WD_PCI_RL1A 0x10 /* Relay 1 Active */ | |
80 | #define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip/reset */ | |
81 | #define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ | |
82 | /* Port 2 : Control Status #2 */ | |
83 | #define WD_PCI_WDIS 0x10 /* Watchdog Disable */ | |
84 | #define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ | |
85 | #define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ | |
86 | #define WD_PCI_PCMD 0x80 /* PC has sent command */ | |
1da177e4 LT |
87 | |
88 | /* according to documentation max. time to process a command for the pci | |
89 | * watchdog card is 100 ms, so we give it 150 ms to do it's job */ | |
90 | #define PCI_COMMAND_TIMEOUT 150 | |
91 | ||
92 | /* Watchdog's internal commands */ | |
a0800f6d WVS |
93 | #define CMD_GET_STATUS 0x04 |
94 | #define CMD_GET_FIRMWARE_VERSION 0x08 | |
95 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 | |
96 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 | |
97 | #define CMD_GET_CLEAR_RESET_COUNT 0x84 | |
1da177e4 | 98 | |
39e3a055 WVS |
99 | /* Watchdog's Dip Switch heartbeat values */ |
100 | static const int heartbeat_tbl [] = { | |
101 | 5, /* OFF-OFF-OFF = 5 Sec */ | |
102 | 10, /* OFF-OFF-ON = 10 Sec */ | |
103 | 30, /* OFF-ON-OFF = 30 Sec */ | |
104 | 60, /* OFF-ON-ON = 1 Min */ | |
105 | 300, /* ON-OFF-OFF = 5 Min */ | |
106 | 600, /* ON-OFF-ON = 10 Min */ | |
107 | 1800, /* ON-ON-OFF = 30 Min */ | |
108 | 3600, /* ON-ON-ON = 1 hour */ | |
109 | }; | |
110 | ||
1da177e4 LT |
111 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
112 | static int cards_found; | |
113 | ||
114 | /* internal variables */ | |
115 | static int temp_panic; | |
116 | static unsigned long is_active; | |
117 | static char expect_release; | |
a0800f6d WVS |
118 | static struct { /* this is private data for each PCI-PC watchdog card */ |
119 | int supports_temp; /* Wether or not the card has a temperature device */ | |
120 | int boot_status; /* The card's boot status */ | |
121 | unsigned long io_addr; /* The cards I/O address */ | |
122 | spinlock_t io_lock; /* the lock for io operations */ | |
123 | struct pci_dev *pdev; /* the PCI-device */ | |
1da177e4 LT |
124 | } pcipcwd_private; |
125 | ||
126 | /* module parameters */ | |
195331d7 WVS |
127 | #define QUIET 0 /* Default */ |
128 | #define VERBOSE 1 /* Verbose */ | |
129 | #define DEBUG 2 /* print fancy stuff too */ | |
130 | static int debug = QUIET; | |
131 | module_param(debug, int, 0); | |
132 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
133 | ||
39e3a055 | 134 | #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ |
1da177e4 LT |
135 | static int heartbeat = WATCHDOG_HEARTBEAT; |
136 | module_param(heartbeat, int, 0); | |
39e3a055 | 137 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
1da177e4 | 138 | |
4bfdf378 | 139 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 140 | module_param(nowayout, int, 0); |
bffda5c8 | 141 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
142 | |
143 | /* | |
144 | * Internal functions | |
145 | */ | |
146 | ||
147 | static int send_command(int cmd, int *msb, int *lsb) | |
148 | { | |
149 | int got_response, count; | |
150 | ||
195331d7 WVS |
151 | if (debug >= DEBUG) |
152 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n", | |
153 | cmd, *msb, *lsb); | |
154 | ||
1da177e4 LT |
155 | spin_lock(&pcipcwd_private.io_lock); |
156 | /* If a command requires data it should be written first. | |
157 | * Data for commands with 8 bits of data should be written to port 4. | |
158 | * Commands with 16 bits of data, should be written as LSB to port 4 | |
159 | * and MSB to port 5. | |
160 | * After the required data has been written then write the command to | |
161 | * port 6. */ | |
162 | outb_p(*lsb, pcipcwd_private.io_addr + 4); | |
163 | outb_p(*msb, pcipcwd_private.io_addr + 5); | |
164 | outb_p(cmd, pcipcwd_private.io_addr + 6); | |
165 | ||
166 | /* wait till the pci card processed the command, signaled by | |
167 | * the WRSP bit in port 2 and give it a max. timeout of | |
168 | * PCI_COMMAND_TIMEOUT to process */ | |
a0800f6d | 169 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
1da177e4 LT |
170 | for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) { |
171 | mdelay(1); | |
a0800f6d | 172 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
1da177e4 LT |
173 | } |
174 | ||
195331d7 WVS |
175 | if (debug >= DEBUG) { |
176 | if (got_response) { | |
177 | printk(KERN_DEBUG PFX "time to process command was: %d ms\n", | |
178 | count); | |
179 | } else { | |
180 | printk(KERN_DEBUG PFX "card did not respond on command!\n"); | |
181 | } | |
182 | } | |
183 | ||
1da177e4 LT |
184 | if (got_response) { |
185 | /* read back response */ | |
186 | *lsb = inb_p(pcipcwd_private.io_addr + 4); | |
187 | *msb = inb_p(pcipcwd_private.io_addr + 5); | |
188 | ||
189 | /* clear WRSP bit */ | |
190 | inb_p(pcipcwd_private.io_addr + 6); | |
195331d7 WVS |
191 | |
192 | if (debug >= DEBUG) | |
193 | printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", | |
194 | cmd, *msb, *lsb); | |
1da177e4 | 195 | } |
195331d7 | 196 | |
1da177e4 LT |
197 | spin_unlock(&pcipcwd_private.io_lock); |
198 | ||
199 | return got_response; | |
200 | } | |
201 | ||
a0800f6d WVS |
202 | static inline void pcipcwd_check_temperature_support(void) |
203 | { | |
204 | if (inb_p(pcipcwd_private.io_addr) != 0xF0) | |
205 | pcipcwd_private.supports_temp = 1; | |
206 | } | |
207 | ||
208 | static int pcipcwd_get_option_switches(void) | |
209 | { | |
210 | int option_switches; | |
211 | ||
212 | option_switches = inb_p(pcipcwd_private.io_addr + 3); | |
213 | return option_switches; | |
214 | } | |
215 | ||
216 | static void pcipcwd_show_card_info(void) | |
217 | { | |
218 | int got_fw_rev, fw_rev_major, fw_rev_minor; | |
219 | char fw_ver_str[20]; /* The cards firmware version */ | |
220 | int option_switches; | |
221 | ||
222 | got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); | |
223 | if (got_fw_rev) { | |
224 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); | |
225 | } else { | |
226 | sprintf(fw_ver_str, "<card no answer>"); | |
227 | } | |
228 | ||
229 | /* Get switch settings */ | |
230 | option_switches = pcipcwd_get_option_switches(); | |
231 | ||
232 | printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n", | |
233 | (int) pcipcwd_private.io_addr, fw_ver_str, | |
234 | (pcipcwd_private.supports_temp ? "with" : "without")); | |
235 | ||
236 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
237 | option_switches, | |
238 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
239 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
240 | ||
241 | if (pcipcwd_private.boot_status & WDIOF_CARDRESET) | |
242 | printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n"); | |
243 | ||
244 | if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) | |
245 | printk(KERN_INFO PFX "Card sensed a CPU Overheat\n"); | |
246 | ||
247 | if (pcipcwd_private.boot_status == 0) | |
248 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
249 | } | |
250 | ||
1da177e4 LT |
251 | static int pcipcwd_start(void) |
252 | { | |
253 | int stat_reg; | |
254 | ||
255 | spin_lock(&pcipcwd_private.io_lock); | |
256 | outb_p(0x00, pcipcwd_private.io_addr + 3); | |
257 | udelay(1000); | |
258 | ||
259 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); | |
260 | spin_unlock(&pcipcwd_private.io_lock); | |
261 | ||
a0800f6d | 262 | if (stat_reg & WD_PCI_WDIS) { |
1da177e4 LT |
263 | printk(KERN_ERR PFX "Card timer not enabled\n"); |
264 | return -1; | |
265 | } | |
266 | ||
195331d7 WVS |
267 | if (debug >= VERBOSE) |
268 | printk(KERN_DEBUG PFX "Watchdog started\n"); | |
269 | ||
1da177e4 LT |
270 | return 0; |
271 | } | |
272 | ||
273 | static int pcipcwd_stop(void) | |
274 | { | |
275 | int stat_reg; | |
276 | ||
277 | spin_lock(&pcipcwd_private.io_lock); | |
278 | outb_p(0xA5, pcipcwd_private.io_addr + 3); | |
279 | udelay(1000); | |
280 | ||
281 | outb_p(0xA5, pcipcwd_private.io_addr + 3); | |
282 | udelay(1000); | |
283 | ||
284 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); | |
285 | spin_unlock(&pcipcwd_private.io_lock); | |
286 | ||
a0800f6d | 287 | if (!(stat_reg & WD_PCI_WDIS)) { |
1da177e4 LT |
288 | printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); |
289 | return -1; | |
290 | } | |
291 | ||
195331d7 WVS |
292 | if (debug >= VERBOSE) |
293 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); | |
294 | ||
1da177e4 LT |
295 | return 0; |
296 | } | |
297 | ||
298 | static int pcipcwd_keepalive(void) | |
299 | { | |
300 | /* Re-trigger watchdog by writing to port 0 */ | |
045798b5 | 301 | spin_lock(&pcipcwd_private.io_lock); |
a0800f6d | 302 | outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ |
045798b5 | 303 | spin_unlock(&pcipcwd_private.io_lock); |
195331d7 WVS |
304 | |
305 | if (debug >= DEBUG) | |
306 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); | |
307 | ||
1da177e4 LT |
308 | return 0; |
309 | } | |
310 | ||
311 | static int pcipcwd_set_heartbeat(int t) | |
312 | { | |
313 | int t_msb = t / 256; | |
314 | int t_lsb = t % 256; | |
315 | ||
316 | if ((t < 0x0001) || (t > 0xFFFF)) | |
317 | return -EINVAL; | |
318 | ||
319 | /* Write new heartbeat to watchdog */ | |
320 | send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); | |
321 | ||
322 | heartbeat = t; | |
195331d7 WVS |
323 | if (debug >= VERBOSE) |
324 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", | |
325 | heartbeat); | |
326 | ||
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | ||
330 | static int pcipcwd_get_status(int *status) | |
331 | { | |
a0800f6d | 332 | int control_status; |
1da177e4 LT |
333 | |
334 | *status=0; | |
a0800f6d WVS |
335 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
336 | if (control_status & WD_PCI_WTRP) | |
1da177e4 | 337 | *status |= WDIOF_CARDRESET; |
a0800f6d | 338 | if (control_status & WD_PCI_TTRP) { |
1da177e4 LT |
339 | *status |= WDIOF_OVERHEAT; |
340 | if (temp_panic) | |
341 | panic(PFX "Temperature overheat trip!\n"); | |
342 | } | |
343 | ||
195331d7 WVS |
344 | if (debug >= DEBUG) |
345 | printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n", | |
346 | control_status); | |
347 | ||
1da177e4 LT |
348 | return 0; |
349 | } | |
350 | ||
351 | static int pcipcwd_clear_status(void) | |
352 | { | |
a0800f6d WVS |
353 | int control_status; |
354 | int msb; | |
355 | int reset_counter; | |
356 | ||
195331d7 WVS |
357 | if (debug >= VERBOSE) |
358 | printk(KERN_INFO PFX "clearing watchdog trip status & LED\n"); | |
359 | ||
a0800f6d WVS |
360 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
361 | ||
195331d7 WVS |
362 | if (debug >= DEBUG) { |
363 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); | |
364 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", | |
365 | (control_status & WD_PCI_R2DS) | WD_PCI_WTRP); | |
366 | } | |
367 | ||
a0800f6d WVS |
368 | /* clear trip status & LED and keep mode of relay 2 */ |
369 | outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1); | |
370 | ||
371 | /* clear reset counter */ | |
372 | msb=0; | |
373 | reset_counter=0xff; | |
374 | send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); | |
375 | ||
195331d7 WVS |
376 | if (debug >= DEBUG) { |
377 | printk(KERN_DEBUG PFX "reset count was: 0x%02x\n", | |
378 | reset_counter); | |
379 | } | |
380 | ||
1da177e4 LT |
381 | return 0; |
382 | } | |
383 | ||
384 | static int pcipcwd_get_temperature(int *temperature) | |
385 | { | |
386 | *temperature = 0; | |
387 | if (!pcipcwd_private.supports_temp) | |
388 | return -ENODEV; | |
389 | ||
045798b5 | 390 | spin_lock(&pcipcwd_private.io_lock); |
a0800f6d | 391 | *temperature = inb_p(pcipcwd_private.io_addr); |
045798b5 | 392 | spin_unlock(&pcipcwd_private.io_lock); |
a0800f6d | 393 | |
1da177e4 LT |
394 | /* |
395 | * Convert celsius to fahrenheit, since this was | |
396 | * the decided 'standard' for this return value. | |
397 | */ | |
a0800f6d | 398 | *temperature = (*temperature * 9 / 5) + 32; |
1da177e4 | 399 | |
195331d7 WVS |
400 | if (debug >= DEBUG) { |
401 | printk(KERN_DEBUG PFX "temperature is: %d F\n", | |
402 | *temperature); | |
403 | } | |
404 | ||
1da177e4 LT |
405 | return 0; |
406 | } | |
407 | ||
58b519f3 WVS |
408 | static int pcipcwd_get_timeleft(int *time_left) |
409 | { | |
410 | int msb; | |
411 | int lsb; | |
412 | ||
413 | /* Read the time that's left before rebooting */ | |
414 | /* Note: if the board is not yet armed then we will read 0xFFFF */ | |
415 | send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); | |
416 | ||
417 | *time_left = (msb << 8) + lsb; | |
418 | ||
419 | if (debug >= VERBOSE) | |
420 | printk(KERN_DEBUG PFX "Time left before next reboot: %d\n", | |
421 | *time_left); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * /dev/watchdog handling | |
428 | */ | |
429 | ||
430 | static ssize_t pcipcwd_write(struct file *file, const char __user *data, | |
a0800f6d | 431 | size_t len, loff_t *ppos) |
1da177e4 LT |
432 | { |
433 | /* See if we got the magic character 'V' and reload the timer */ | |
434 | if (len) { | |
435 | if (!nowayout) { | |
436 | size_t i; | |
437 | ||
438 | /* note: just in case someone wrote the magic character | |
439 | * five months ago... */ | |
440 | expect_release = 0; | |
441 | ||
442 | /* scan to see whether or not we got the magic character */ | |
443 | for (i = 0; i != len; i++) { | |
444 | char c; | |
445 | if(get_user(c, data+i)) | |
446 | return -EFAULT; | |
447 | if (c == 'V') | |
448 | expect_release = 42; | |
449 | } | |
450 | } | |
451 | ||
452 | /* someone wrote to us, we should reload the timer */ | |
453 | pcipcwd_keepalive(); | |
454 | } | |
455 | return len; | |
456 | } | |
457 | ||
458 | static int pcipcwd_ioctl(struct inode *inode, struct file *file, | |
459 | unsigned int cmd, unsigned long arg) | |
460 | { | |
461 | void __user *argp = (void __user *)arg; | |
462 | int __user *p = argp; | |
463 | static struct watchdog_info ident = { | |
464 | .options = WDIOF_OVERHEAT | | |
465 | WDIOF_CARDRESET | | |
466 | WDIOF_KEEPALIVEPING | | |
467 | WDIOF_SETTIMEOUT | | |
468 | WDIOF_MAGICCLOSE, | |
469 | .firmware_version = 1, | |
470 | .identity = WATCHDOG_DRIVER_NAME, | |
471 | }; | |
472 | ||
473 | switch (cmd) { | |
474 | case WDIOC_GETSUPPORT: | |
475 | return copy_to_user(argp, &ident, | |
476 | sizeof (ident)) ? -EFAULT : 0; | |
477 | ||
478 | case WDIOC_GETSTATUS: | |
479 | { | |
480 | int status; | |
481 | ||
482 | pcipcwd_get_status(&status); | |
483 | ||
484 | return put_user(status, p); | |
485 | } | |
486 | ||
487 | case WDIOC_GETBOOTSTATUS: | |
488 | return put_user(pcipcwd_private.boot_status, p); | |
489 | ||
490 | case WDIOC_GETTEMP: | |
491 | { | |
492 | int temperature; | |
493 | ||
494 | if (pcipcwd_get_temperature(&temperature)) | |
495 | return -EFAULT; | |
496 | ||
497 | return put_user(temperature, p); | |
498 | } | |
499 | ||
500 | case WDIOC_KEEPALIVE: | |
501 | pcipcwd_keepalive(); | |
502 | return 0; | |
503 | ||
504 | case WDIOC_SETOPTIONS: | |
505 | { | |
506 | int new_options, retval = -EINVAL; | |
507 | ||
508 | if (get_user (new_options, p)) | |
509 | return -EFAULT; | |
510 | ||
511 | if (new_options & WDIOS_DISABLECARD) { | |
c315b7e8 WVS |
512 | if (pcipcwd_stop()) |
513 | return -EIO; | |
1da177e4 LT |
514 | retval = 0; |
515 | } | |
516 | ||
517 | if (new_options & WDIOS_ENABLECARD) { | |
c315b7e8 WVS |
518 | if (pcipcwd_start()) |
519 | return -EIO; | |
1da177e4 LT |
520 | retval = 0; |
521 | } | |
522 | ||
523 | if (new_options & WDIOS_TEMPPANIC) { | |
524 | temp_panic = 1; | |
525 | retval = 0; | |
526 | } | |
527 | ||
528 | return retval; | |
529 | } | |
530 | ||
531 | case WDIOC_SETTIMEOUT: | |
532 | { | |
533 | int new_heartbeat; | |
534 | ||
535 | if (get_user(new_heartbeat, p)) | |
536 | return -EFAULT; | |
537 | ||
538 | if (pcipcwd_set_heartbeat(new_heartbeat)) | |
539 | return -EINVAL; | |
540 | ||
541 | pcipcwd_keepalive(); | |
542 | /* Fall */ | |
543 | } | |
544 | ||
545 | case WDIOC_GETTIMEOUT: | |
546 | return put_user(heartbeat, p); | |
547 | ||
58b519f3 WVS |
548 | case WDIOC_GETTIMELEFT: |
549 | { | |
550 | int time_left; | |
551 | ||
552 | if (pcipcwd_get_timeleft(&time_left)) | |
553 | return -EFAULT; | |
554 | ||
555 | return put_user(time_left, p); | |
556 | } | |
557 | ||
1da177e4 | 558 | default: |
795b89d2 | 559 | return -ENOTTY; |
1da177e4 LT |
560 | } |
561 | } | |
562 | ||
563 | static int pcipcwd_open(struct inode *inode, struct file *file) | |
564 | { | |
565 | /* /dev/watchdog can only be opened once */ | |
a0800f6d | 566 | if (test_and_set_bit(0, &is_active)) { |
195331d7 WVS |
567 | if (debug >= VERBOSE) |
568 | printk(KERN_ERR PFX "Attempt to open already opened device.\n"); | |
1da177e4 | 569 | return -EBUSY; |
a0800f6d | 570 | } |
1da177e4 LT |
571 | |
572 | /* Activate */ | |
573 | pcipcwd_start(); | |
574 | pcipcwd_keepalive(); | |
575 | return nonseekable_open(inode, file); | |
576 | } | |
577 | ||
578 | static int pcipcwd_release(struct inode *inode, struct file *file) | |
579 | { | |
580 | /* | |
581 | * Shut off the timer. | |
582 | */ | |
583 | if (expect_release == 42) { | |
584 | pcipcwd_stop(); | |
585 | } else { | |
586 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
587 | pcipcwd_keepalive(); | |
588 | } | |
589 | expect_release = 0; | |
590 | clear_bit(0, &is_active); | |
591 | return 0; | |
592 | } | |
593 | ||
594 | /* | |
595 | * /dev/temperature handling | |
596 | */ | |
597 | ||
598 | static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, | |
599 | size_t len, loff_t *ppos) | |
600 | { | |
601 | int temperature; | |
602 | ||
603 | if (pcipcwd_get_temperature(&temperature)) | |
604 | return -EFAULT; | |
605 | ||
606 | if (copy_to_user (data, &temperature, 1)) | |
607 | return -EFAULT; | |
608 | ||
609 | return 1; | |
610 | } | |
611 | ||
612 | static int pcipcwd_temp_open(struct inode *inode, struct file *file) | |
613 | { | |
614 | if (!pcipcwd_private.supports_temp) | |
615 | return -ENODEV; | |
616 | ||
617 | return nonseekable_open(inode, file); | |
618 | } | |
619 | ||
620 | static int pcipcwd_temp_release(struct inode *inode, struct file *file) | |
621 | { | |
622 | return 0; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Notify system | |
627 | */ | |
628 | ||
629 | static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
630 | { | |
631 | if (code==SYS_DOWN || code==SYS_HALT) { | |
632 | /* Turn the WDT off */ | |
633 | pcipcwd_stop(); | |
634 | } | |
635 | ||
636 | return NOTIFY_DONE; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Kernel Interfaces | |
641 | */ | |
642 | ||
62322d25 | 643 | static const struct file_operations pcipcwd_fops = { |
1da177e4 LT |
644 | .owner = THIS_MODULE, |
645 | .llseek = no_llseek, | |
646 | .write = pcipcwd_write, | |
647 | .ioctl = pcipcwd_ioctl, | |
648 | .open = pcipcwd_open, | |
649 | .release = pcipcwd_release, | |
650 | }; | |
651 | ||
652 | static struct miscdevice pcipcwd_miscdev = { | |
653 | .minor = WATCHDOG_MINOR, | |
654 | .name = "watchdog", | |
655 | .fops = &pcipcwd_fops, | |
656 | }; | |
657 | ||
62322d25 | 658 | static const struct file_operations pcipcwd_temp_fops = { |
1da177e4 LT |
659 | .owner = THIS_MODULE, |
660 | .llseek = no_llseek, | |
661 | .read = pcipcwd_temp_read, | |
662 | .open = pcipcwd_temp_open, | |
663 | .release = pcipcwd_temp_release, | |
664 | }; | |
665 | ||
666 | static struct miscdevice pcipcwd_temp_miscdev = { | |
667 | .minor = TEMP_MINOR, | |
668 | .name = "temperature", | |
669 | .fops = &pcipcwd_temp_fops, | |
670 | }; | |
671 | ||
672 | static struct notifier_block pcipcwd_notifier = { | |
673 | .notifier_call = pcipcwd_notify_sys, | |
674 | }; | |
675 | ||
676 | /* | |
677 | * Init & exit routines | |
678 | */ | |
679 | ||
1da177e4 LT |
680 | static int __devinit pcipcwd_card_init(struct pci_dev *pdev, |
681 | const struct pci_device_id *ent) | |
682 | { | |
683 | int ret = -EIO; | |
1da177e4 LT |
684 | |
685 | cards_found++; | |
686 | if (cards_found == 1) | |
687 | printk(KERN_INFO PFX DRIVER_VERSION); | |
688 | ||
689 | if (cards_found > 1) { | |
690 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
691 | return -ENODEV; | |
692 | } | |
693 | ||
694 | if (pci_enable_device(pdev)) { | |
695 | printk(KERN_ERR PFX "Not possible to enable PCI Device\n"); | |
696 | return -ENODEV; | |
697 | } | |
698 | ||
699 | if (pci_resource_start(pdev, 0) == 0x0000) { | |
700 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
701 | ret = -ENODEV; | |
702 | goto err_out_disable_device; | |
703 | } | |
704 | ||
705 | pcipcwd_private.pdev = pdev; | |
706 | pcipcwd_private.io_addr = pci_resource_start(pdev, 0); | |
707 | ||
708 | if (pci_request_regions(pdev, WATCHDOG_NAME)) { | |
709 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", | |
710 | (int) pcipcwd_private.io_addr); | |
711 | ret = -EIO; | |
712 | goto err_out_disable_device; | |
713 | } | |
714 | ||
715 | /* get the boot_status */ | |
716 | pcipcwd_get_status(&pcipcwd_private.boot_status); | |
717 | ||
718 | /* clear the "card caused reboot" flag */ | |
719 | pcipcwd_clear_status(); | |
720 | ||
721 | /* disable card */ | |
722 | pcipcwd_stop(); | |
723 | ||
724 | /* Check whether or not the card supports the temperature device */ | |
a0800f6d | 725 | pcipcwd_check_temperature_support(); |
1da177e4 | 726 | |
a0800f6d WVS |
727 | /* Show info about the card itself */ |
728 | pcipcwd_show_card_info(); | |
1da177e4 | 729 | |
39e3a055 WVS |
730 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
731 | if (heartbeat == 0) | |
732 | heartbeat = heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)]; | |
733 | ||
1da177e4 LT |
734 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ |
735 | if (pcipcwd_set_heartbeat(heartbeat)) { | |
736 | pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
737 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
738 | WATCHDOG_HEARTBEAT); | |
739 | } | |
740 | ||
741 | ret = register_reboot_notifier(&pcipcwd_notifier); | |
742 | if (ret != 0) { | |
743 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
744 | ret); | |
745 | goto err_out_release_region; | |
746 | } | |
747 | ||
748 | if (pcipcwd_private.supports_temp) { | |
749 | ret = misc_register(&pcipcwd_temp_miscdev); | |
750 | if (ret != 0) { | |
751 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
752 | TEMP_MINOR, ret); | |
753 | goto err_out_unregister_reboot; | |
754 | } | |
755 | } | |
756 | ||
757 | ret = misc_register(&pcipcwd_miscdev); | |
758 | if (ret != 0) { | |
759 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
760 | WATCHDOG_MINOR, ret); | |
761 | goto err_out_misc_deregister; | |
762 | } | |
763 | ||
764 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
765 | heartbeat, nowayout); | |
766 | ||
767 | return 0; | |
768 | ||
769 | err_out_misc_deregister: | |
770 | if (pcipcwd_private.supports_temp) | |
771 | misc_deregister(&pcipcwd_temp_miscdev); | |
772 | err_out_unregister_reboot: | |
773 | unregister_reboot_notifier(&pcipcwd_notifier); | |
774 | err_out_release_region: | |
775 | pci_release_regions(pdev); | |
776 | err_out_disable_device: | |
777 | pci_disable_device(pdev); | |
778 | return ret; | |
779 | } | |
780 | ||
781 | static void __devexit pcipcwd_card_exit(struct pci_dev *pdev) | |
782 | { | |
783 | /* Stop the timer before we leave */ | |
784 | if (!nowayout) | |
785 | pcipcwd_stop(); | |
786 | ||
787 | /* Deregister */ | |
788 | misc_deregister(&pcipcwd_miscdev); | |
789 | if (pcipcwd_private.supports_temp) | |
790 | misc_deregister(&pcipcwd_temp_miscdev); | |
791 | unregister_reboot_notifier(&pcipcwd_notifier); | |
792 | pci_release_regions(pdev); | |
793 | pci_disable_device(pdev); | |
794 | cards_found--; | |
795 | } | |
796 | ||
797 | static struct pci_device_id pcipcwd_pci_tbl[] = { | |
798 | { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, | |
799 | PCI_ANY_ID, PCI_ANY_ID, }, | |
800 | { 0 }, /* End of list */ | |
801 | }; | |
802 | MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); | |
803 | ||
804 | static struct pci_driver pcipcwd_driver = { | |
805 | .name = WATCHDOG_NAME, | |
806 | .id_table = pcipcwd_pci_tbl, | |
807 | .probe = pcipcwd_card_init, | |
808 | .remove = __devexit_p(pcipcwd_card_exit), | |
809 | }; | |
810 | ||
811 | static int __init pcipcwd_init_module(void) | |
812 | { | |
a0800f6d | 813 | spin_lock_init(&pcipcwd_private.io_lock); |
1da177e4 LT |
814 | |
815 | return pci_register_driver(&pcipcwd_driver); | |
816 | } | |
817 | ||
818 | static void __exit pcipcwd_cleanup_module(void) | |
819 | { | |
820 | pci_unregister_driver(&pcipcwd_driver); | |
045798b5 WVS |
821 | |
822 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); | |
1da177e4 LT |
823 | } |
824 | ||
825 | module_init(pcipcwd_init_module); | |
826 | module_exit(pcipcwd_cleanup_module); | |
827 | ||
828 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); | |
829 | MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); | |
830 | MODULE_LICENSE("GPL"); | |
831 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
832 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |