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 */ |
97 | static 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 */ |
109 | static int cards_found; |
110 | |
111 | /* internal variables */ |
112 | static int temp_panic; |
113 | static unsigned long is_active; |
114 | static char expect_release; |
115 | /* this is private data for each PCI-PC watchdog card */ |
116 | static 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 */ |
133 | static int debug = QUIET; |
134 | module_param(debug, int, 0); |
135 | MODULE_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 */ |
139 | static int heartbeat = WATCHDOG_HEARTBEAT; |
140 | module_param(heartbeat, int, 0); |
141 | MODULE_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 | |
145 | static bool nowayout = WATCHDOG_NOWAYOUT; |
146 | module_param(nowayout, bool, 0); |
147 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
148 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")" ); |
149 | |
150 | /* |
151 | * Internal functions |
152 | */ |
153 | |
154 | static 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(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(value: *lsb, port: pcipcwd_private.io_addr + 4); |
170 | outb_p(value: *msb, port: pcipcwd_private.io_addr + 5); |
171 | outb_p(value: cmd, port: 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(port: 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(port: 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(port: pcipcwd_private.io_addr + 4); |
195 | *msb = inb_p(port: pcipcwd_private.io_addr + 5); |
196 | |
197 | /* clear WRSP bit */ |
198 | inb_p(port: 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(lock: &pcipcwd_private.io_lock); |
206 | |
207 | return got_response; |
208 | } |
209 | |
210 | static inline void pcipcwd_check_temperature_support(void) |
211 | { |
212 | if (inb_p(port: pcipcwd_private.io_addr) != 0xF0) |
213 | pcipcwd_private.supports_temp = 1; |
214 | } |
215 | |
216 | static int pcipcwd_get_option_switches(void) |
217 | { |
218 | int option_switches; |
219 | |
220 | option_switches = inb_p(port: pcipcwd_private.io_addr + 3); |
221 | return option_switches; |
222 | } |
223 | |
224 | static 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, msb: &fw_rev_major, |
231 | lsb: &fw_rev_minor); |
232 | if (got_fw_rev) |
233 | sprintf(buf: fw_ver_str, fmt: "%u.%02u" , fw_rev_major, fw_rev_minor); |
234 | else |
235 | sprintf(buf: fw_ver_str, fmt: "<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 | |
259 | static int pcipcwd_start(void) |
260 | { |
261 | int stat_reg; |
262 | |
263 | spin_lock(lock: &pcipcwd_private.io_lock); |
264 | outb_p(value: 0x00, port: pcipcwd_private.io_addr + 3); |
265 | udelay(1000); |
266 | |
267 | stat_reg = inb_p(port: pcipcwd_private.io_addr + 2); |
268 | spin_unlock(lock: &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 | |
281 | static int pcipcwd_stop(void) |
282 | { |
283 | int stat_reg; |
284 | |
285 | spin_lock(lock: &pcipcwd_private.io_lock); |
286 | outb_p(value: 0xA5, port: pcipcwd_private.io_addr + 3); |
287 | udelay(1000); |
288 | |
289 | outb_p(value: 0xA5, port: pcipcwd_private.io_addr + 3); |
290 | udelay(1000); |
291 | |
292 | stat_reg = inb_p(port: pcipcwd_private.io_addr + 2); |
293 | spin_unlock(lock: &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 | |
306 | static int pcipcwd_keepalive(void) |
307 | { |
308 | /* Re-trigger watchdog by writing to port 0 */ |
309 | spin_lock(lock: &pcipcwd_private.io_lock); |
310 | outb_p(value: 0x42, port: pcipcwd_private.io_addr); /* send out any data */ |
311 | spin_unlock(lock: &pcipcwd_private.io_lock); |
312 | |
313 | if (debug >= DEBUG) |
314 | pr_debug("Watchdog keepalive signal send\n" ); |
315 | |
316 | return 0; |
317 | } |
318 | |
319 | static 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, msb: &t_msb, lsb: &t_lsb); |
329 | |
330 | heartbeat = t; |
331 | if (debug >= VERBOSE) |
332 | pr_debug("New heartbeat: %d\n" , heartbeat); |
333 | |
334 | return 0; |
335 | } |
336 | |
337 | static int pcipcwd_get_status(int *status) |
338 | { |
339 | int control_status; |
340 | |
341 | *status = 0; |
342 | control_status = inb_p(port: 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 | |
357 | static 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(port: 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(value: (control_status & WD_PCI_R2DS) | WD_PCI_WTRP, |
376 | port: 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: &msb, lsb: &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 | |
390 | static int pcipcwd_get_temperature(int *temperature) |
391 | { |
392 | *temperature = 0; |
393 | if (!pcipcwd_private.supports_temp) |
394 | return -ENODEV; |
395 | |
396 | spin_lock(lock: &pcipcwd_private.io_lock); |
397 | *temperature = inb_p(port: pcipcwd_private.io_addr); |
398 | spin_unlock(lock: &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 | |
413 | static 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: &msb, lsb: &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 | |
434 | static 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 | |
463 | static 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(to: argp, from: &ident, n: sizeof(ident)) ? -EFAULT : 0; |
481 | |
482 | case WDIOC_GETSTATUS: |
483 | { |
484 | int status; |
485 | pcipcwd_get_status(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: &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(t: 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: &time_left)) |
555 | return -EFAULT; |
556 | |
557 | return put_user(time_left, p); |
558 | } |
559 | |
560 | default: |
561 | return -ENOTTY; |
562 | } |
563 | } |
564 | |
565 | static int pcipcwd_open(struct inode *inode, struct file *file) |
566 | { |
567 | /* /dev/watchdog can only be opened once */ |
568 | if (test_and_set_bit(nr: 0, addr: &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, filp: file); |
578 | } |
579 | |
580 | static 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(nr: 0, addr: &is_active); |
593 | return 0; |
594 | } |
595 | |
596 | /* |
597 | * /dev/temperature handling |
598 | */ |
599 | |
600 | static 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: &temperature)) |
606 | return -EFAULT; |
607 | |
608 | if (copy_to_user(to: data, from: &temperature, n: 1)) |
609 | return -EFAULT; |
610 | |
611 | return 1; |
612 | } |
613 | |
614 | static 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, filp: file); |
620 | } |
621 | |
622 | static int pcipcwd_temp_release(struct inode *inode, struct file *file) |
623 | { |
624 | return 0; |
625 | } |
626 | |
627 | /* |
628 | * Notify system |
629 | */ |
630 | |
631 | static 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 | |
644 | static 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 | |
654 | static struct miscdevice pcipcwd_miscdev = { |
655 | .minor = WATCHDOG_MINOR, |
656 | .name = "watchdog" , |
657 | .fops = &pcipcwd_fops, |
658 | }; |
659 | |
660 | static 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 | |
668 | static struct miscdevice pcipcwd_temp_miscdev = { |
669 | .minor = TEMP_MINOR, |
670 | .name = "temperature" , |
671 | .fops = &pcipcwd_temp_fops, |
672 | }; |
673 | |
674 | static struct notifier_block pcipcwd_notifier = { |
675 | .notifier_call = pcipcwd_notify_sys, |
676 | }; |
677 | |
678 | /* |
679 | * Init & exit routines |
680 | */ |
681 | |
682 | static 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(dev: 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(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(t: 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(misc: &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(misc: &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 | |
773 | err_out_misc_deregister: |
774 | if (pcipcwd_private.supports_temp) |
775 | misc_deregister(misc: &pcipcwd_temp_miscdev); |
776 | err_out_unregister_reboot: |
777 | unregister_reboot_notifier(&pcipcwd_notifier); |
778 | err_out_release_region: |
779 | pci_release_regions(pdev); |
780 | err_out_disable_device: |
781 | pci_disable_device(dev: pdev); |
782 | return ret; |
783 | } |
784 | |
785 | static 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(misc: &pcipcwd_miscdev); |
793 | if (pcipcwd_private.supports_temp) |
794 | misc_deregister(misc: &pcipcwd_temp_miscdev); |
795 | unregister_reboot_notifier(&pcipcwd_notifier); |
796 | pci_release_regions(pdev); |
797 | pci_disable_device(dev: pdev); |
798 | cards_found--; |
799 | } |
800 | |
801 | static 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 | }; |
806 | MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); |
807 | |
808 | static 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 | |
815 | module_pci_driver(pcipcwd_driver); |
816 | |
817 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>" ); |
818 | MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver" ); |
819 | MODULE_LICENSE("GPL" ); |
820 | |