Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Berkshire PCI-PC Watchdog Card Driver | |
3 | * | |
b3faed63 | 4 | * (c) Copyright 2003-2005 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/config.h> /* For CONFIG_WATCHDOG_NOWAYOUT/... */ |
35 | #include <linux/module.h> /* For module specific items */ | |
36 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
37 | #include <linux/types.h> /* For standard types (like size_t) */ | |
38 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
39 | #include <linux/kernel.h> /* For printk/panic/... */ | |
40 | #include <linux/delay.h> /* For mdelay function */ | |
41 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ | |
42 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
43 | #include <linux/notifier.h> /* For notifier support */ | |
44 | #include <linux/reboot.h> /* For reboot_notifier stuff */ | |
45 | #include <linux/init.h> /* For __init/__exit/... */ | |
46 | #include <linux/fs.h> /* For file operations */ | |
47 | #include <linux/pci.h> /* For pci functions */ | |
48 | #include <linux/ioport.h> /* For io-port access */ | |
49 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
50 | ||
51 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ | |
52 | #include <asm/io.h> /* For inb/outb/... */ | |
1da177e4 LT |
53 | |
54 | /* Module and version information */ | |
a0800f6d WVS |
55 | #define WATCHDOG_VERSION "1.02" |
56 | #define WATCHDOG_DATE "03 Sep 2005" | |
1da177e4 LT |
57 | #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" |
58 | #define WATCHDOG_NAME "pcwd_pci" | |
59 | #define PFX WATCHDOG_NAME ": " | |
60 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" | |
61 | ||
62 | /* Stuff for the PCI ID's */ | |
63 | #ifndef PCI_VENDOR_ID_QUICKLOGIC | |
64 | #define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 | |
65 | #endif | |
66 | ||
67 | #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD | |
68 | #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 | |
69 | #endif | |
70 | ||
71 | /* | |
72 | * These are the defines that describe the control status bits for the | |
73 | * PCI-PC Watchdog card. | |
74 | */ | |
a0800f6d WVS |
75 | /* Port 1 : Control Status #1 */ |
76 | #define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ | |
77 | #define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ | |
78 | #define WD_PCI_TTRP 0x04 /* Temperature Trip status */ | |
79 | #define WD_PCI_RL2A 0x08 /* Relay 2 Active */ | |
80 | #define WD_PCI_RL1A 0x10 /* Relay 1 Active */ | |
81 | #define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip/reset */ | |
82 | #define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ | |
83 | /* Port 2 : Control Status #2 */ | |
84 | #define WD_PCI_WDIS 0x10 /* Watchdog Disable */ | |
85 | #define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ | |
86 | #define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ | |
87 | #define WD_PCI_PCMD 0x80 /* PC has sent command */ | |
1da177e4 LT |
88 | |
89 | /* according to documentation max. time to process a command for the pci | |
90 | * watchdog card is 100 ms, so we give it 150 ms to do it's job */ | |
91 | #define PCI_COMMAND_TIMEOUT 150 | |
92 | ||
93 | /* Watchdog's internal commands */ | |
a0800f6d WVS |
94 | #define CMD_GET_STATUS 0x04 |
95 | #define CMD_GET_FIRMWARE_VERSION 0x08 | |
96 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 | |
97 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 | |
98 | #define CMD_GET_CLEAR_RESET_COUNT 0x84 | |
1da177e4 LT |
99 | |
100 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
101 | static int cards_found; | |
102 | ||
103 | /* internal variables */ | |
104 | static int temp_panic; | |
105 | static unsigned long is_active; | |
106 | static char expect_release; | |
a0800f6d WVS |
107 | static struct { /* this is private data for each PCI-PC watchdog card */ |
108 | int supports_temp; /* Wether or not the card has a temperature device */ | |
109 | int boot_status; /* The card's boot status */ | |
110 | unsigned long io_addr; /* The cards I/O address */ | |
111 | spinlock_t io_lock; /* the lock for io operations */ | |
112 | struct pci_dev *pdev; /* the PCI-device */ | |
1da177e4 LT |
113 | } pcipcwd_private; |
114 | ||
115 | /* module parameters */ | |
195331d7 WVS |
116 | #define QUIET 0 /* Default */ |
117 | #define VERBOSE 1 /* Verbose */ | |
118 | #define DEBUG 2 /* print fancy stuff too */ | |
119 | static int debug = QUIET; | |
120 | module_param(debug, int, 0); | |
121 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); | |
122 | ||
1da177e4 LT |
123 | #define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */ |
124 | static int heartbeat = WATCHDOG_HEARTBEAT; | |
125 | module_param(heartbeat, int, 0); | |
126 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); | |
127 | ||
4bfdf378 | 128 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 LT |
129 | module_param(nowayout, int, 0); |
130 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
131 | ||
132 | /* | |
133 | * Internal functions | |
134 | */ | |
135 | ||
136 | static int send_command(int cmd, int *msb, int *lsb) | |
137 | { | |
138 | int got_response, count; | |
139 | ||
195331d7 WVS |
140 | if (debug >= DEBUG) |
141 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n", | |
142 | cmd, *msb, *lsb); | |
143 | ||
1da177e4 LT |
144 | spin_lock(&pcipcwd_private.io_lock); |
145 | /* If a command requires data it should be written first. | |
146 | * Data for commands with 8 bits of data should be written to port 4. | |
147 | * Commands with 16 bits of data, should be written as LSB to port 4 | |
148 | * and MSB to port 5. | |
149 | * After the required data has been written then write the command to | |
150 | * port 6. */ | |
151 | outb_p(*lsb, pcipcwd_private.io_addr + 4); | |
152 | outb_p(*msb, pcipcwd_private.io_addr + 5); | |
153 | outb_p(cmd, pcipcwd_private.io_addr + 6); | |
154 | ||
155 | /* wait till the pci card processed the command, signaled by | |
156 | * the WRSP bit in port 2 and give it a max. timeout of | |
157 | * PCI_COMMAND_TIMEOUT to process */ | |
a0800f6d | 158 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
1da177e4 LT |
159 | for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) { |
160 | mdelay(1); | |
a0800f6d | 161 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
1da177e4 LT |
162 | } |
163 | ||
195331d7 WVS |
164 | if (debug >= DEBUG) { |
165 | if (got_response) { | |
166 | printk(KERN_DEBUG PFX "time to process command was: %d ms\n", | |
167 | count); | |
168 | } else { | |
169 | printk(KERN_DEBUG PFX "card did not respond on command!\n"); | |
170 | } | |
171 | } | |
172 | ||
1da177e4 LT |
173 | if (got_response) { |
174 | /* read back response */ | |
175 | *lsb = inb_p(pcipcwd_private.io_addr + 4); | |
176 | *msb = inb_p(pcipcwd_private.io_addr + 5); | |
177 | ||
178 | /* clear WRSP bit */ | |
179 | inb_p(pcipcwd_private.io_addr + 6); | |
195331d7 WVS |
180 | |
181 | if (debug >= DEBUG) | |
182 | printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", | |
183 | cmd, *msb, *lsb); | |
1da177e4 | 184 | } |
195331d7 | 185 | |
1da177e4 LT |
186 | spin_unlock(&pcipcwd_private.io_lock); |
187 | ||
188 | return got_response; | |
189 | } | |
190 | ||
a0800f6d WVS |
191 | static inline void pcipcwd_check_temperature_support(void) |
192 | { | |
193 | if (inb_p(pcipcwd_private.io_addr) != 0xF0) | |
194 | pcipcwd_private.supports_temp = 1; | |
195 | } | |
196 | ||
197 | static int pcipcwd_get_option_switches(void) | |
198 | { | |
199 | int option_switches; | |
200 | ||
201 | option_switches = inb_p(pcipcwd_private.io_addr + 3); | |
202 | return option_switches; | |
203 | } | |
204 | ||
205 | static void pcipcwd_show_card_info(void) | |
206 | { | |
207 | int got_fw_rev, fw_rev_major, fw_rev_minor; | |
208 | char fw_ver_str[20]; /* The cards firmware version */ | |
209 | int option_switches; | |
210 | ||
211 | got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); | |
212 | if (got_fw_rev) { | |
213 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); | |
214 | } else { | |
215 | sprintf(fw_ver_str, "<card no answer>"); | |
216 | } | |
217 | ||
218 | /* Get switch settings */ | |
219 | option_switches = pcipcwd_get_option_switches(); | |
220 | ||
221 | printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n", | |
222 | (int) pcipcwd_private.io_addr, fw_ver_str, | |
223 | (pcipcwd_private.supports_temp ? "with" : "without")); | |
224 | ||
225 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", | |
226 | option_switches, | |
227 | ((option_switches & 0x10) ? "ON" : "OFF"), | |
228 | ((option_switches & 0x08) ? "ON" : "OFF")); | |
229 | ||
230 | if (pcipcwd_private.boot_status & WDIOF_CARDRESET) | |
231 | printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n"); | |
232 | ||
233 | if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) | |
234 | printk(KERN_INFO PFX "Card sensed a CPU Overheat\n"); | |
235 | ||
236 | if (pcipcwd_private.boot_status == 0) | |
237 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); | |
238 | } | |
239 | ||
1da177e4 LT |
240 | static int pcipcwd_start(void) |
241 | { | |
242 | int stat_reg; | |
243 | ||
244 | spin_lock(&pcipcwd_private.io_lock); | |
245 | outb_p(0x00, pcipcwd_private.io_addr + 3); | |
246 | udelay(1000); | |
247 | ||
248 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); | |
249 | spin_unlock(&pcipcwd_private.io_lock); | |
250 | ||
a0800f6d | 251 | if (stat_reg & WD_PCI_WDIS) { |
1da177e4 LT |
252 | printk(KERN_ERR PFX "Card timer not enabled\n"); |
253 | return -1; | |
254 | } | |
255 | ||
195331d7 WVS |
256 | if (debug >= VERBOSE) |
257 | printk(KERN_DEBUG PFX "Watchdog started\n"); | |
258 | ||
1da177e4 LT |
259 | return 0; |
260 | } | |
261 | ||
262 | static int pcipcwd_stop(void) | |
263 | { | |
264 | int stat_reg; | |
265 | ||
266 | spin_lock(&pcipcwd_private.io_lock); | |
267 | outb_p(0xA5, pcipcwd_private.io_addr + 3); | |
268 | udelay(1000); | |
269 | ||
270 | outb_p(0xA5, pcipcwd_private.io_addr + 3); | |
271 | udelay(1000); | |
272 | ||
273 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); | |
274 | spin_unlock(&pcipcwd_private.io_lock); | |
275 | ||
a0800f6d | 276 | if (!(stat_reg & WD_PCI_WDIS)) { |
1da177e4 LT |
277 | printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); |
278 | return -1; | |
279 | } | |
280 | ||
195331d7 WVS |
281 | if (debug >= VERBOSE) |
282 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); | |
283 | ||
1da177e4 LT |
284 | return 0; |
285 | } | |
286 | ||
287 | static int pcipcwd_keepalive(void) | |
288 | { | |
289 | /* Re-trigger watchdog by writing to port 0 */ | |
a0800f6d | 290 | outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ |
195331d7 WVS |
291 | |
292 | if (debug >= DEBUG) | |
293 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); | |
294 | ||
1da177e4 LT |
295 | return 0; |
296 | } | |
297 | ||
298 | static int pcipcwd_set_heartbeat(int t) | |
299 | { | |
300 | int t_msb = t / 256; | |
301 | int t_lsb = t % 256; | |
302 | ||
303 | if ((t < 0x0001) || (t > 0xFFFF)) | |
304 | return -EINVAL; | |
305 | ||
306 | /* Write new heartbeat to watchdog */ | |
307 | send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); | |
308 | ||
309 | heartbeat = t; | |
195331d7 WVS |
310 | if (debug >= VERBOSE) |
311 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", | |
312 | heartbeat); | |
313 | ||
1da177e4 LT |
314 | return 0; |
315 | } | |
316 | ||
317 | static int pcipcwd_get_status(int *status) | |
318 | { | |
a0800f6d | 319 | int control_status; |
1da177e4 LT |
320 | |
321 | *status=0; | |
a0800f6d WVS |
322 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
323 | if (control_status & WD_PCI_WTRP) | |
1da177e4 | 324 | *status |= WDIOF_CARDRESET; |
a0800f6d | 325 | if (control_status & WD_PCI_TTRP) { |
1da177e4 LT |
326 | *status |= WDIOF_OVERHEAT; |
327 | if (temp_panic) | |
328 | panic(PFX "Temperature overheat trip!\n"); | |
329 | } | |
330 | ||
195331d7 WVS |
331 | if (debug >= DEBUG) |
332 | printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n", | |
333 | control_status); | |
334 | ||
1da177e4 LT |
335 | return 0; |
336 | } | |
337 | ||
338 | static int pcipcwd_clear_status(void) | |
339 | { | |
a0800f6d WVS |
340 | int control_status; |
341 | int msb; | |
342 | int reset_counter; | |
343 | ||
195331d7 WVS |
344 | if (debug >= VERBOSE) |
345 | printk(KERN_INFO PFX "clearing watchdog trip status & LED\n"); | |
346 | ||
a0800f6d WVS |
347 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
348 | ||
195331d7 WVS |
349 | if (debug >= DEBUG) { |
350 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); | |
351 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", | |
352 | (control_status & WD_PCI_R2DS) | WD_PCI_WTRP); | |
353 | } | |
354 | ||
a0800f6d WVS |
355 | /* clear trip status & LED and keep mode of relay 2 */ |
356 | outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1); | |
357 | ||
358 | /* clear reset counter */ | |
359 | msb=0; | |
360 | reset_counter=0xff; | |
361 | send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); | |
362 | ||
195331d7 WVS |
363 | if (debug >= DEBUG) { |
364 | printk(KERN_DEBUG PFX "reset count was: 0x%02x\n", | |
365 | reset_counter); | |
366 | } | |
367 | ||
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
371 | static int pcipcwd_get_temperature(int *temperature) | |
372 | { | |
373 | *temperature = 0; | |
374 | if (!pcipcwd_private.supports_temp) | |
375 | return -ENODEV; | |
376 | ||
a0800f6d WVS |
377 | *temperature = inb_p(pcipcwd_private.io_addr); |
378 | ||
1da177e4 LT |
379 | /* |
380 | * Convert celsius to fahrenheit, since this was | |
381 | * the decided 'standard' for this return value. | |
382 | */ | |
a0800f6d | 383 | *temperature = (*temperature * 9 / 5) + 32; |
1da177e4 | 384 | |
195331d7 WVS |
385 | if (debug >= DEBUG) { |
386 | printk(KERN_DEBUG PFX "temperature is: %d F\n", | |
387 | *temperature); | |
388 | } | |
389 | ||
1da177e4 LT |
390 | return 0; |
391 | } | |
392 | ||
58b519f3 WVS |
393 | static int pcipcwd_get_timeleft(int *time_left) |
394 | { | |
395 | int msb; | |
396 | int lsb; | |
397 | ||
398 | /* Read the time that's left before rebooting */ | |
399 | /* Note: if the board is not yet armed then we will read 0xFFFF */ | |
400 | send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); | |
401 | ||
402 | *time_left = (msb << 8) + lsb; | |
403 | ||
404 | if (debug >= VERBOSE) | |
405 | printk(KERN_DEBUG PFX "Time left before next reboot: %d\n", | |
406 | *time_left); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * /dev/watchdog handling | |
413 | */ | |
414 | ||
415 | static ssize_t pcipcwd_write(struct file *file, const char __user *data, | |
a0800f6d | 416 | size_t len, loff_t *ppos) |
1da177e4 LT |
417 | { |
418 | /* See if we got the magic character 'V' and reload the timer */ | |
419 | if (len) { | |
420 | if (!nowayout) { | |
421 | size_t i; | |
422 | ||
423 | /* note: just in case someone wrote the magic character | |
424 | * five months ago... */ | |
425 | expect_release = 0; | |
426 | ||
427 | /* scan to see whether or not we got the magic character */ | |
428 | for (i = 0; i != len; i++) { | |
429 | char c; | |
430 | if(get_user(c, data+i)) | |
431 | return -EFAULT; | |
432 | if (c == 'V') | |
433 | expect_release = 42; | |
434 | } | |
435 | } | |
436 | ||
437 | /* someone wrote to us, we should reload the timer */ | |
438 | pcipcwd_keepalive(); | |
439 | } | |
440 | return len; | |
441 | } | |
442 | ||
443 | static int pcipcwd_ioctl(struct inode *inode, struct file *file, | |
444 | unsigned int cmd, unsigned long arg) | |
445 | { | |
446 | void __user *argp = (void __user *)arg; | |
447 | int __user *p = argp; | |
448 | static struct watchdog_info ident = { | |
449 | .options = WDIOF_OVERHEAT | | |
450 | WDIOF_CARDRESET | | |
451 | WDIOF_KEEPALIVEPING | | |
452 | WDIOF_SETTIMEOUT | | |
453 | WDIOF_MAGICCLOSE, | |
454 | .firmware_version = 1, | |
455 | .identity = WATCHDOG_DRIVER_NAME, | |
456 | }; | |
457 | ||
458 | switch (cmd) { | |
459 | case WDIOC_GETSUPPORT: | |
460 | return copy_to_user(argp, &ident, | |
461 | sizeof (ident)) ? -EFAULT : 0; | |
462 | ||
463 | case WDIOC_GETSTATUS: | |
464 | { | |
465 | int status; | |
466 | ||
467 | pcipcwd_get_status(&status); | |
468 | ||
469 | return put_user(status, p); | |
470 | } | |
471 | ||
472 | case WDIOC_GETBOOTSTATUS: | |
473 | return put_user(pcipcwd_private.boot_status, p); | |
474 | ||
475 | case WDIOC_GETTEMP: | |
476 | { | |
477 | int temperature; | |
478 | ||
479 | if (pcipcwd_get_temperature(&temperature)) | |
480 | return -EFAULT; | |
481 | ||
482 | return put_user(temperature, p); | |
483 | } | |
484 | ||
485 | case WDIOC_KEEPALIVE: | |
486 | pcipcwd_keepalive(); | |
487 | return 0; | |
488 | ||
489 | case WDIOC_SETOPTIONS: | |
490 | { | |
491 | int new_options, retval = -EINVAL; | |
492 | ||
493 | if (get_user (new_options, p)) | |
494 | return -EFAULT; | |
495 | ||
496 | if (new_options & WDIOS_DISABLECARD) { | |
c315b7e8 WVS |
497 | if (pcipcwd_stop()) |
498 | return -EIO; | |
1da177e4 LT |
499 | retval = 0; |
500 | } | |
501 | ||
502 | if (new_options & WDIOS_ENABLECARD) { | |
c315b7e8 WVS |
503 | if (pcipcwd_start()) |
504 | return -EIO; | |
1da177e4 LT |
505 | retval = 0; |
506 | } | |
507 | ||
508 | if (new_options & WDIOS_TEMPPANIC) { | |
509 | temp_panic = 1; | |
510 | retval = 0; | |
511 | } | |
512 | ||
513 | return retval; | |
514 | } | |
515 | ||
516 | case WDIOC_SETTIMEOUT: | |
517 | { | |
518 | int new_heartbeat; | |
519 | ||
520 | if (get_user(new_heartbeat, p)) | |
521 | return -EFAULT; | |
522 | ||
523 | if (pcipcwd_set_heartbeat(new_heartbeat)) | |
524 | return -EINVAL; | |
525 | ||
526 | pcipcwd_keepalive(); | |
527 | /* Fall */ | |
528 | } | |
529 | ||
530 | case WDIOC_GETTIMEOUT: | |
531 | return put_user(heartbeat, p); | |
532 | ||
58b519f3 WVS |
533 | case WDIOC_GETTIMELEFT: |
534 | { | |
535 | int time_left; | |
536 | ||
537 | if (pcipcwd_get_timeleft(&time_left)) | |
538 | return -EFAULT; | |
539 | ||
540 | return put_user(time_left, p); | |
541 | } | |
542 | ||
1da177e4 LT |
543 | default: |
544 | return -ENOIOCTLCMD; | |
545 | } | |
546 | } | |
547 | ||
548 | static int pcipcwd_open(struct inode *inode, struct file *file) | |
549 | { | |
550 | /* /dev/watchdog can only be opened once */ | |
a0800f6d | 551 | if (test_and_set_bit(0, &is_active)) { |
195331d7 WVS |
552 | if (debug >= VERBOSE) |
553 | printk(KERN_ERR PFX "Attempt to open already opened device.\n"); | |
1da177e4 | 554 | return -EBUSY; |
a0800f6d | 555 | } |
1da177e4 LT |
556 | |
557 | /* Activate */ | |
558 | pcipcwd_start(); | |
559 | pcipcwd_keepalive(); | |
560 | return nonseekable_open(inode, file); | |
561 | } | |
562 | ||
563 | static int pcipcwd_release(struct inode *inode, struct file *file) | |
564 | { | |
565 | /* | |
566 | * Shut off the timer. | |
567 | */ | |
568 | if (expect_release == 42) { | |
569 | pcipcwd_stop(); | |
570 | } else { | |
571 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); | |
572 | pcipcwd_keepalive(); | |
573 | } | |
574 | expect_release = 0; | |
575 | clear_bit(0, &is_active); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | /* | |
580 | * /dev/temperature handling | |
581 | */ | |
582 | ||
583 | static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, | |
584 | size_t len, loff_t *ppos) | |
585 | { | |
586 | int temperature; | |
587 | ||
588 | if (pcipcwd_get_temperature(&temperature)) | |
589 | return -EFAULT; | |
590 | ||
591 | if (copy_to_user (data, &temperature, 1)) | |
592 | return -EFAULT; | |
593 | ||
594 | return 1; | |
595 | } | |
596 | ||
597 | static int pcipcwd_temp_open(struct inode *inode, struct file *file) | |
598 | { | |
599 | if (!pcipcwd_private.supports_temp) | |
600 | return -ENODEV; | |
601 | ||
602 | return nonseekable_open(inode, file); | |
603 | } | |
604 | ||
605 | static int pcipcwd_temp_release(struct inode *inode, struct file *file) | |
606 | { | |
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Notify system | |
612 | */ | |
613 | ||
614 | static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) | |
615 | { | |
616 | if (code==SYS_DOWN || code==SYS_HALT) { | |
617 | /* Turn the WDT off */ | |
618 | pcipcwd_stop(); | |
619 | } | |
620 | ||
621 | return NOTIFY_DONE; | |
622 | } | |
623 | ||
624 | /* | |
625 | * Kernel Interfaces | |
626 | */ | |
627 | ||
62322d25 | 628 | static const struct file_operations pcipcwd_fops = { |
1da177e4 LT |
629 | .owner = THIS_MODULE, |
630 | .llseek = no_llseek, | |
631 | .write = pcipcwd_write, | |
632 | .ioctl = pcipcwd_ioctl, | |
633 | .open = pcipcwd_open, | |
634 | .release = pcipcwd_release, | |
635 | }; | |
636 | ||
637 | static struct miscdevice pcipcwd_miscdev = { | |
638 | .minor = WATCHDOG_MINOR, | |
639 | .name = "watchdog", | |
640 | .fops = &pcipcwd_fops, | |
641 | }; | |
642 | ||
62322d25 | 643 | static const struct file_operations pcipcwd_temp_fops = { |
1da177e4 LT |
644 | .owner = THIS_MODULE, |
645 | .llseek = no_llseek, | |
646 | .read = pcipcwd_temp_read, | |
647 | .open = pcipcwd_temp_open, | |
648 | .release = pcipcwd_temp_release, | |
649 | }; | |
650 | ||
651 | static struct miscdevice pcipcwd_temp_miscdev = { | |
652 | .minor = TEMP_MINOR, | |
653 | .name = "temperature", | |
654 | .fops = &pcipcwd_temp_fops, | |
655 | }; | |
656 | ||
657 | static struct notifier_block pcipcwd_notifier = { | |
658 | .notifier_call = pcipcwd_notify_sys, | |
659 | }; | |
660 | ||
661 | /* | |
662 | * Init & exit routines | |
663 | */ | |
664 | ||
1da177e4 LT |
665 | static int __devinit pcipcwd_card_init(struct pci_dev *pdev, |
666 | const struct pci_device_id *ent) | |
667 | { | |
668 | int ret = -EIO; | |
1da177e4 LT |
669 | |
670 | cards_found++; | |
671 | if (cards_found == 1) | |
672 | printk(KERN_INFO PFX DRIVER_VERSION); | |
673 | ||
674 | if (cards_found > 1) { | |
675 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); | |
676 | return -ENODEV; | |
677 | } | |
678 | ||
679 | if (pci_enable_device(pdev)) { | |
680 | printk(KERN_ERR PFX "Not possible to enable PCI Device\n"); | |
681 | return -ENODEV; | |
682 | } | |
683 | ||
684 | if (pci_resource_start(pdev, 0) == 0x0000) { | |
685 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
686 | ret = -ENODEV; | |
687 | goto err_out_disable_device; | |
688 | } | |
689 | ||
690 | pcipcwd_private.pdev = pdev; | |
691 | pcipcwd_private.io_addr = pci_resource_start(pdev, 0); | |
692 | ||
693 | if (pci_request_regions(pdev, WATCHDOG_NAME)) { | |
694 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", | |
695 | (int) pcipcwd_private.io_addr); | |
696 | ret = -EIO; | |
697 | goto err_out_disable_device; | |
698 | } | |
699 | ||
700 | /* get the boot_status */ | |
701 | pcipcwd_get_status(&pcipcwd_private.boot_status); | |
702 | ||
703 | /* clear the "card caused reboot" flag */ | |
704 | pcipcwd_clear_status(); | |
705 | ||
706 | /* disable card */ | |
707 | pcipcwd_stop(); | |
708 | ||
709 | /* Check whether or not the card supports the temperature device */ | |
a0800f6d | 710 | pcipcwd_check_temperature_support(); |
1da177e4 | 711 | |
a0800f6d WVS |
712 | /* Show info about the card itself */ |
713 | pcipcwd_show_card_info(); | |
1da177e4 LT |
714 | |
715 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
716 | if (pcipcwd_set_heartbeat(heartbeat)) { | |
717 | pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); | |
718 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
719 | WATCHDOG_HEARTBEAT); | |
720 | } | |
721 | ||
722 | ret = register_reboot_notifier(&pcipcwd_notifier); | |
723 | if (ret != 0) { | |
724 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", | |
725 | ret); | |
726 | goto err_out_release_region; | |
727 | } | |
728 | ||
729 | if (pcipcwd_private.supports_temp) { | |
730 | ret = misc_register(&pcipcwd_temp_miscdev); | |
731 | if (ret != 0) { | |
732 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
733 | TEMP_MINOR, ret); | |
734 | goto err_out_unregister_reboot; | |
735 | } | |
736 | } | |
737 | ||
738 | ret = misc_register(&pcipcwd_miscdev); | |
739 | if (ret != 0) { | |
740 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
741 | WATCHDOG_MINOR, ret); | |
742 | goto err_out_misc_deregister; | |
743 | } | |
744 | ||
745 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
746 | heartbeat, nowayout); | |
747 | ||
748 | return 0; | |
749 | ||
750 | err_out_misc_deregister: | |
751 | if (pcipcwd_private.supports_temp) | |
752 | misc_deregister(&pcipcwd_temp_miscdev); | |
753 | err_out_unregister_reboot: | |
754 | unregister_reboot_notifier(&pcipcwd_notifier); | |
755 | err_out_release_region: | |
756 | pci_release_regions(pdev); | |
757 | err_out_disable_device: | |
758 | pci_disable_device(pdev); | |
759 | return ret; | |
760 | } | |
761 | ||
762 | static void __devexit pcipcwd_card_exit(struct pci_dev *pdev) | |
763 | { | |
764 | /* Stop the timer before we leave */ | |
765 | if (!nowayout) | |
766 | pcipcwd_stop(); | |
767 | ||
768 | /* Deregister */ | |
769 | misc_deregister(&pcipcwd_miscdev); | |
770 | if (pcipcwd_private.supports_temp) | |
771 | misc_deregister(&pcipcwd_temp_miscdev); | |
772 | unregister_reboot_notifier(&pcipcwd_notifier); | |
773 | pci_release_regions(pdev); | |
774 | pci_disable_device(pdev); | |
775 | cards_found--; | |
776 | } | |
777 | ||
778 | static struct pci_device_id pcipcwd_pci_tbl[] = { | |
779 | { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, | |
780 | PCI_ANY_ID, PCI_ANY_ID, }, | |
781 | { 0 }, /* End of list */ | |
782 | }; | |
783 | MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); | |
784 | ||
785 | static struct pci_driver pcipcwd_driver = { | |
786 | .name = WATCHDOG_NAME, | |
787 | .id_table = pcipcwd_pci_tbl, | |
788 | .probe = pcipcwd_card_init, | |
789 | .remove = __devexit_p(pcipcwd_card_exit), | |
790 | }; | |
791 | ||
792 | static int __init pcipcwd_init_module(void) | |
793 | { | |
a0800f6d | 794 | spin_lock_init(&pcipcwd_private.io_lock); |
1da177e4 LT |
795 | |
796 | return pci_register_driver(&pcipcwd_driver); | |
797 | } | |
798 | ||
799 | static void __exit pcipcwd_cleanup_module(void) | |
800 | { | |
801 | pci_unregister_driver(&pcipcwd_driver); | |
802 | } | |
803 | ||
804 | module_init(pcipcwd_init_module); | |
805 | module_exit(pcipcwd_cleanup_module); | |
806 | ||
807 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); | |
808 | MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); | |
809 | MODULE_LICENSE("GPL"); | |
810 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
811 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |