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4c6e63bd WVS |
1 | /* |
2 | * sch311x_wdt.c - Driver for the SCH311x Super-I/O chips | |
3 | * integrated watchdog. | |
4 | * | |
5 | * (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor | |
13 | * provide warranty for any of this software. This material is | |
14 | * provided "AS-IS" and at no charge. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Includes, defines, variables, module parameters, ... | |
19 | */ | |
20 | ||
21 | /* Includes */ | |
22 | #include <linux/module.h> /* For module specific items */ | |
23 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
24 | #include <linux/types.h> /* For standard types (like size_t) */ | |
25 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
26 | #include <linux/kernel.h> /* For printk/... */ | |
27 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV | |
28 | (WATCHDOG_MINOR) */ | |
29 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
30 | #include <linux/init.h> /* For __init/__exit/... */ | |
31 | #include <linux/fs.h> /* For file operations */ | |
32 | #include <linux/platform_device.h> /* For platform_driver framework */ | |
33 | #include <linux/ioport.h> /* For io-port access */ | |
34 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
35 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ | |
36 | #include <linux/io.h> /* For inb/outb/... */ | |
37 | ||
38 | /* Module and version information */ | |
39 | #define DRV_NAME "sch311x_wdt" | |
40 | #define PFX DRV_NAME ": " | |
41 | ||
42 | /* Runtime registers */ | |
43 | #define RESGEN 0x1d | |
44 | #define GP60 0x47 | |
45 | #define WDT_TIME_OUT 0x65 | |
46 | #define WDT_VAL 0x66 | |
47 | #define WDT_CFG 0x67 | |
48 | #define WDT_CTRL 0x68 | |
49 | ||
50 | /* internal variables */ | |
51 | static unsigned long sch311x_wdt_is_open; | |
52 | static char sch311x_wdt_expect_close; | |
53 | static struct platform_device *sch311x_wdt_pdev; | |
54 | ||
55 | static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 }; | |
56 | ||
57 | static struct { /* The devices private data */ | |
58 | /* the Runtime Register base address */ | |
59 | unsigned short runtime_reg; | |
60 | /* The card's boot status */ | |
61 | int boot_status; | |
62 | /* the lock for io operations */ | |
63 | spinlock_t io_lock; | |
64 | } sch311x_wdt_data; | |
65 | ||
66 | /* Module load parameters */ | |
67 | static unsigned short force_id; | |
68 | module_param(force_id, ushort, 0); | |
69 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); | |
70 | ||
71 | static unsigned short therm_trip; | |
72 | module_param(therm_trip, ushort, 0); | |
73 | MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator"); | |
74 | ||
75 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ | |
76 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ | |
77 | module_param(timeout, int, 0); | |
78 | MODULE_PARM_DESC(timeout, | |
79 | "Watchdog timeout in seconds. 1<= timeout <=15300, default=" | |
80 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); | |
81 | ||
82 | static int nowayout = WATCHDOG_NOWAYOUT; | |
83 | module_param(nowayout, int, 0); | |
84 | MODULE_PARM_DESC(nowayout, | |
85 | "Watchdog cannot be stopped once started (default=" | |
86 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
87 | ||
88 | /* | |
89 | * Super-IO functions | |
90 | */ | |
91 | ||
92 | static inline void sch311x_sio_enter(int sio_config_port) | |
93 | { | |
94 | outb(0x55, sio_config_port); | |
95 | } | |
96 | ||
97 | static inline void sch311x_sio_exit(int sio_config_port) | |
98 | { | |
99 | outb(0xaa, sio_config_port); | |
100 | } | |
101 | ||
102 | static inline int sch311x_sio_inb(int sio_config_port, int reg) | |
103 | { | |
104 | outb(reg, sio_config_port); | |
105 | return inb(sio_config_port + 1); | |
106 | } | |
107 | ||
108 | static inline void sch311x_sio_outb(int sio_config_port, int reg, int val) | |
109 | { | |
110 | outb(reg, sio_config_port); | |
111 | outb(val, sio_config_port + 1); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Watchdog Operations | |
116 | */ | |
117 | ||
118 | static void sch311x_wdt_set_timeout(int t) | |
119 | { | |
120 | unsigned char timeout_unit = 0x80; | |
121 | ||
122 | /* When new timeout is bigger then 255 seconds, we will use minutes */ | |
123 | if (t > 255) { | |
124 | timeout_unit = 0; | |
125 | t /= 60; | |
126 | } | |
127 | ||
128 | /* -- Watchdog Timeout -- | |
129 | * Bit 0-6 (Reserved) | |
130 | * Bit 7 WDT Time-out Value Units Select | |
131 | * (0 = Minutes, 1 = Seconds) | |
132 | */ | |
133 | outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT); | |
134 | ||
135 | /* -- Watchdog Timer Time-out Value -- | |
136 | * Bit 0-7 Binary coded units (0=Disabled, 1..255) | |
137 | */ | |
138 | outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL); | |
139 | } | |
140 | ||
141 | static void sch311x_wdt_start(void) | |
142 | { | |
143 | spin_lock(&sch311x_wdt_data.io_lock); | |
144 | ||
145 | /* set watchdog's timeout */ | |
146 | sch311x_wdt_set_timeout(timeout); | |
147 | /* enable the watchdog */ | |
148 | /* -- General Purpose I/O Bit 6.0 -- | |
149 | * Bit 0, In/Out: 0 = Output, 1 = Input | |
150 | * Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
151 | * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT, | |
152 | * 10 = Either Edge Triggered Intr.4 | |
153 | * Bit 4-6 (Reserved) | |
154 | * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
155 | */ | |
156 | outb(0x0e, sch311x_wdt_data.runtime_reg + GP60); | |
157 | ||
158 | spin_unlock(&sch311x_wdt_data.io_lock); | |
159 | ||
160 | } | |
161 | ||
162 | static void sch311x_wdt_stop(void) | |
163 | { | |
164 | spin_lock(&sch311x_wdt_data.io_lock); | |
165 | ||
166 | /* stop the watchdog */ | |
167 | outb(0x01, sch311x_wdt_data.runtime_reg + GP60); | |
168 | /* disable timeout by setting it to 0 */ | |
169 | sch311x_wdt_set_timeout(0); | |
170 | ||
171 | spin_unlock(&sch311x_wdt_data.io_lock); | |
172 | } | |
173 | ||
174 | static void sch311x_wdt_keepalive(void) | |
175 | { | |
176 | spin_lock(&sch311x_wdt_data.io_lock); | |
177 | sch311x_wdt_set_timeout(timeout); | |
178 | spin_unlock(&sch311x_wdt_data.io_lock); | |
179 | } | |
180 | ||
181 | static int sch311x_wdt_set_heartbeat(int t) | |
182 | { | |
183 | if (t < 1 || t > (255*60)) | |
184 | return -EINVAL; | |
185 | ||
186 | /* When new timeout is bigger then 255 seconds, | |
187 | * we will round up to minutes (with a max of 255) */ | |
188 | if (t > 255) | |
189 | t = (((t - 1) / 60) + 1) * 60; | |
190 | ||
191 | timeout = t; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static void sch311x_wdt_get_status(int *status) | |
196 | { | |
197 | unsigned char new_status; | |
198 | ||
199 | *status = 0; | |
200 | ||
201 | spin_lock(&sch311x_wdt_data.io_lock); | |
202 | ||
203 | /* -- Watchdog timer control -- | |
204 | * Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured | |
205 | * Bit 1 Reserved | |
206 | * Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning) | |
207 | * Bit 3 P20 Force Timeout enabled: | |
208 | * 0 = P20 activity does not generate the WD timeout event | |
209 | * 1 = P20 Allows rising edge of P20, from the keyboard | |
210 | * controller, to force the WD timeout event. | |
211 | * Bit 4-7 Reserved | |
212 | */ | |
213 | new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL); | |
214 | if (new_status & 0x01) | |
215 | *status |= WDIOF_CARDRESET; | |
216 | ||
217 | spin_unlock(&sch311x_wdt_data.io_lock); | |
218 | } | |
219 | ||
220 | /* | |
221 | * /dev/watchdog handling | |
222 | */ | |
223 | ||
224 | static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf, | |
225 | size_t count, loff_t *ppos) | |
226 | { | |
227 | if (count) { | |
228 | if (!nowayout) { | |
229 | size_t i; | |
230 | ||
231 | sch311x_wdt_expect_close = 0; | |
232 | ||
233 | for (i = 0; i != count; i++) { | |
234 | char c; | |
235 | if (get_user(c, buf + i)) | |
236 | return -EFAULT; | |
237 | if (c == 'V') | |
238 | sch311x_wdt_expect_close = 42; | |
239 | } | |
240 | } | |
241 | sch311x_wdt_keepalive(); | |
242 | } | |
243 | return count; | |
244 | } | |
245 | ||
246 | static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd, | |
247 | unsigned long arg) | |
248 | { | |
249 | int status; | |
250 | int new_timeout; | |
251 | void __user *argp = (void __user *)arg; | |
252 | int __user *p = argp; | |
42747d71 | 253 | static const struct watchdog_info ident = { |
4c6e63bd WVS |
254 | .options = WDIOF_KEEPALIVEPING | |
255 | WDIOF_SETTIMEOUT | | |
256 | WDIOF_MAGICCLOSE, | |
257 | .firmware_version = 1, | |
258 | .identity = DRV_NAME, | |
259 | }; | |
260 | ||
261 | switch (cmd) { | |
262 | case WDIOC_GETSUPPORT: | |
263 | if (copy_to_user(argp, &ident, sizeof(ident))) | |
264 | return -EFAULT; | |
265 | break; | |
266 | ||
267 | case WDIOC_GETSTATUS: | |
268 | { | |
269 | sch311x_wdt_get_status(&status); | |
270 | return put_user(status, p); | |
271 | } | |
272 | case WDIOC_GETBOOTSTATUS: | |
273 | return put_user(sch311x_wdt_data.boot_status, p); | |
274 | ||
275 | case WDIOC_SETOPTIONS: | |
276 | { | |
277 | int options, retval = -EINVAL; | |
278 | ||
279 | if (get_user(options, p)) | |
280 | return -EFAULT; | |
281 | if (options & WDIOS_DISABLECARD) { | |
282 | sch311x_wdt_stop(); | |
283 | retval = 0; | |
284 | } | |
285 | if (options & WDIOS_ENABLECARD) { | |
286 | sch311x_wdt_start(); | |
287 | retval = 0; | |
288 | } | |
289 | return retval; | |
290 | } | |
291 | case WDIOC_KEEPALIVE: | |
292 | sch311x_wdt_keepalive(); | |
293 | break; | |
294 | ||
295 | case WDIOC_SETTIMEOUT: | |
296 | if (get_user(new_timeout, p)) | |
297 | return -EFAULT; | |
298 | if (sch311x_wdt_set_heartbeat(new_timeout)) | |
299 | return -EINVAL; | |
300 | sch311x_wdt_keepalive(); | |
301 | /* Fall */ | |
302 | case WDIOC_GETTIMEOUT: | |
303 | return put_user(timeout, p); | |
304 | default: | |
305 | return -ENOTTY; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int sch311x_wdt_open(struct inode *inode, struct file *file) | |
311 | { | |
312 | if (test_and_set_bit(0, &sch311x_wdt_is_open)) | |
313 | return -EBUSY; | |
314 | /* | |
315 | * Activate | |
316 | */ | |
317 | sch311x_wdt_start(); | |
318 | return nonseekable_open(inode, file); | |
319 | } | |
320 | ||
321 | static int sch311x_wdt_close(struct inode *inode, struct file *file) | |
322 | { | |
323 | if (sch311x_wdt_expect_close == 42) { | |
324 | sch311x_wdt_stop(); | |
325 | } else { | |
326 | printk(KERN_CRIT PFX | |
327 | "Unexpected close, not stopping watchdog!\n"); | |
328 | sch311x_wdt_keepalive(); | |
329 | } | |
330 | clear_bit(0, &sch311x_wdt_is_open); | |
331 | sch311x_wdt_expect_close = 0; | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Kernel Interfaces | |
337 | */ | |
338 | ||
339 | static const struct file_operations sch311x_wdt_fops = { | |
340 | .owner = THIS_MODULE, | |
341 | .llseek = no_llseek, | |
342 | .write = sch311x_wdt_write, | |
343 | .unlocked_ioctl = sch311x_wdt_ioctl, | |
344 | .open = sch311x_wdt_open, | |
345 | .release = sch311x_wdt_close, | |
346 | }; | |
347 | ||
348 | static struct miscdevice sch311x_wdt_miscdev = { | |
349 | .minor = WATCHDOG_MINOR, | |
350 | .name = "watchdog", | |
351 | .fops = &sch311x_wdt_fops, | |
352 | }; | |
353 | ||
354 | /* | |
355 | * Init & exit routines | |
356 | */ | |
357 | ||
358 | static int __devinit sch311x_wdt_probe(struct platform_device *pdev) | |
359 | { | |
360 | struct device *dev = &pdev->dev; | |
361 | unsigned char val; | |
362 | int err; | |
363 | ||
364 | spin_lock_init(&sch311x_wdt_data.io_lock); | |
365 | ||
366 | if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1, | |
367 | DRV_NAME)) { | |
368 | dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n", | |
369 | sch311x_wdt_data.runtime_reg + RESGEN, | |
370 | sch311x_wdt_data.runtime_reg + RESGEN); | |
371 | err = -EBUSY; | |
372 | goto exit; | |
373 | } | |
374 | ||
375 | if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) { | |
376 | dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n", | |
377 | sch311x_wdt_data.runtime_reg + GP60, | |
378 | sch311x_wdt_data.runtime_reg + GP60); | |
379 | err = -EBUSY; | |
380 | goto exit_release_region; | |
381 | } | |
382 | ||
383 | if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4, | |
384 | DRV_NAME)) { | |
385 | dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n", | |
386 | sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, | |
387 | sch311x_wdt_data.runtime_reg + WDT_CTRL); | |
388 | err = -EBUSY; | |
389 | goto exit_release_region2; | |
390 | } | |
391 | ||
392 | /* Make sure that the watchdog is not running */ | |
393 | sch311x_wdt_stop(); | |
394 | ||
395 | /* Disable keyboard and mouse interaction and interrupt */ | |
396 | /* -- Watchdog timer configuration -- | |
397 | * Bit 0 Reserved | |
398 | * Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr. | |
399 | * Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr | |
400 | * Bit 3 Reserved | |
401 | * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled, | |
402 | * 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15) | |
403 | */ | |
404 | outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG); | |
405 | ||
406 | /* Check that the heartbeat value is within it's range ; | |
407 | * if not reset to the default */ | |
408 | if (sch311x_wdt_set_heartbeat(timeout)) { | |
409 | sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT); | |
410 | dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n", | |
411 | timeout); | |
412 | } | |
413 | ||
414 | /* Get status at boot */ | |
415 | sch311x_wdt_get_status(&sch311x_wdt_data.boot_status); | |
416 | ||
417 | /* enable watchdog */ | |
418 | /* -- Reset Generator -- | |
419 | * Bit 0 Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled | |
420 | * Bit 1 Thermtrip Source Select: O* = No Source, 1 = Source | |
421 | * Bit 2 WDT2_CTL: WDT input bit | |
422 | * Bit 3-7 Reserved | |
423 | */ | |
424 | outb(0, sch311x_wdt_data.runtime_reg + RESGEN); | |
425 | val = therm_trip ? 0x06 : 0x04; | |
426 | outb(val, sch311x_wdt_data.runtime_reg + RESGEN); | |
427 | ||
4c4b638e WVS |
428 | sch311x_wdt_miscdev.parent = dev; |
429 | ||
4c6e63bd WVS |
430 | err = misc_register(&sch311x_wdt_miscdev); |
431 | if (err != 0) { | |
432 | dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n", | |
433 | WATCHDOG_MINOR, err); | |
434 | goto exit_release_region3; | |
435 | } | |
436 | ||
4c6e63bd WVS |
437 | dev_info(dev, |
438 | "SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n", | |
439 | timeout, nowayout); | |
440 | ||
441 | return 0; | |
442 | ||
443 | exit_release_region3: | |
444 | release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4); | |
445 | exit_release_region2: | |
446 | release_region(sch311x_wdt_data.runtime_reg + GP60, 1); | |
447 | exit_release_region: | |
448 | release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1); | |
449 | sch311x_wdt_data.runtime_reg = 0; | |
450 | exit: | |
451 | return err; | |
452 | } | |
453 | ||
454 | static int __devexit sch311x_wdt_remove(struct platform_device *pdev) | |
455 | { | |
456 | /* Stop the timer before we leave */ | |
457 | if (!nowayout) | |
458 | sch311x_wdt_stop(); | |
459 | ||
460 | /* Deregister */ | |
461 | misc_deregister(&sch311x_wdt_miscdev); | |
462 | release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4); | |
463 | release_region(sch311x_wdt_data.runtime_reg + GP60, 1); | |
464 | release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1); | |
465 | sch311x_wdt_data.runtime_reg = 0; | |
466 | return 0; | |
467 | } | |
468 | ||
469 | static void sch311x_wdt_shutdown(struct platform_device *dev) | |
470 | { | |
471 | /* Turn the WDT off if we have a soft shutdown */ | |
472 | sch311x_wdt_stop(); | |
473 | } | |
474 | ||
475 | #define sch311x_wdt_suspend NULL | |
476 | #define sch311x_wdt_resume NULL | |
477 | ||
478 | static struct platform_driver sch311x_wdt_driver = { | |
479 | .probe = sch311x_wdt_probe, | |
480 | .remove = __devexit_p(sch311x_wdt_remove), | |
481 | .shutdown = sch311x_wdt_shutdown, | |
482 | .suspend = sch311x_wdt_suspend, | |
483 | .resume = sch311x_wdt_resume, | |
484 | .driver = { | |
485 | .owner = THIS_MODULE, | |
486 | .name = DRV_NAME, | |
487 | }, | |
488 | }; | |
489 | ||
490 | static int __init sch311x_detect(int sio_config_port, unsigned short *addr) | |
491 | { | |
492 | int err = 0, reg; | |
493 | unsigned short base_addr; | |
494 | unsigned char dev_id; | |
495 | ||
496 | sch311x_sio_enter(sio_config_port); | |
497 | ||
498 | /* Check device ID. We currently know about: | |
499 | * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */ | |
500 | reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20); | |
501 | if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) { | |
502 | err = -ENODEV; | |
503 | goto exit; | |
504 | } | |
505 | dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6; | |
506 | ||
507 | /* Select logical device A (runtime registers) */ | |
508 | sch311x_sio_outb(sio_config_port, 0x07, 0x0a); | |
509 | ||
510 | /* Check if Logical Device Register is currently active */ | |
511 | if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0) | |
512 | printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n"); | |
513 | ||
514 | /* Get the base address of the runtime registers */ | |
515 | base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) | | |
516 | sch311x_sio_inb(sio_config_port, 0x61); | |
517 | if (!base_addr) { | |
518 | printk(KERN_ERR PFX "Base address not set.\n"); | |
519 | err = -ENODEV; | |
520 | goto exit; | |
521 | } | |
522 | *addr = base_addr; | |
523 | ||
524 | printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n", | |
525 | dev_id, base_addr); | |
526 | ||
527 | exit: | |
528 | sch311x_sio_exit(sio_config_port); | |
529 | return err; | |
530 | } | |
531 | ||
532 | static int __init sch311x_wdt_init(void) | |
533 | { | |
534 | int err, i, found = 0; | |
535 | unsigned short addr = 0; | |
536 | ||
537 | for (i = 0; !found && sch311x_ioports[i]; i++) | |
538 | if (sch311x_detect(sch311x_ioports[i], &addr) == 0) | |
539 | found++; | |
540 | ||
541 | if (!found) | |
542 | return -ENODEV; | |
543 | ||
544 | sch311x_wdt_data.runtime_reg = addr; | |
545 | ||
546 | err = platform_driver_register(&sch311x_wdt_driver); | |
547 | if (err) | |
548 | return err; | |
549 | ||
550 | sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr, | |
551 | NULL, 0); | |
552 | ||
553 | if (IS_ERR(sch311x_wdt_pdev)) { | |
554 | err = PTR_ERR(sch311x_wdt_pdev); | |
555 | goto unreg_platform_driver; | |
556 | } | |
557 | ||
558 | return 0; | |
559 | ||
560 | unreg_platform_driver: | |
561 | platform_driver_unregister(&sch311x_wdt_driver); | |
562 | return err; | |
563 | } | |
564 | ||
565 | static void __exit sch311x_wdt_exit(void) | |
566 | { | |
567 | platform_device_unregister(sch311x_wdt_pdev); | |
568 | platform_driver_unregister(&sch311x_wdt_driver); | |
569 | } | |
570 | ||
571 | module_init(sch311x_wdt_init); | |
572 | module_exit(sch311x_wdt_exit); | |
573 | ||
574 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); | |
575 | MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver"); | |
576 | MODULE_LICENSE("GPL"); | |
577 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
578 |