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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 | ||
27c766aa JP |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
4c6e63bd WVS |
23 | /* Includes */ |
24 | #include <linux/module.h> /* For module specific items */ | |
25 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
26 | #include <linux/types.h> /* For standard types (like size_t) */ | |
27 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
28 | #include <linux/kernel.h> /* For printk/... */ | |
29 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV | |
30 | (WATCHDOG_MINOR) */ | |
31 | #include <linux/watchdog.h> /* For the watchdog specific items */ | |
32 | #include <linux/init.h> /* For __init/__exit/... */ | |
33 | #include <linux/fs.h> /* For file operations */ | |
34 | #include <linux/platform_device.h> /* For platform_driver framework */ | |
35 | #include <linux/ioport.h> /* For io-port access */ | |
36 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
37 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ | |
38 | #include <linux/io.h> /* For inb/outb/... */ | |
39 | ||
40 | /* Module and version information */ | |
41 | #define DRV_NAME "sch311x_wdt" | |
4c6e63bd WVS |
42 | |
43 | /* Runtime registers */ | |
44 | #define RESGEN 0x1d | |
45 | #define GP60 0x47 | |
46 | #define WDT_TIME_OUT 0x65 | |
47 | #define WDT_VAL 0x66 | |
48 | #define WDT_CFG 0x67 | |
49 | #define WDT_CTRL 0x68 | |
50 | ||
51 | /* internal variables */ | |
52 | static unsigned long sch311x_wdt_is_open; | |
53 | static char sch311x_wdt_expect_close; | |
54 | static struct platform_device *sch311x_wdt_pdev; | |
55 | ||
56 | static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 }; | |
57 | ||
58 | static struct { /* The devices private data */ | |
59 | /* the Runtime Register base address */ | |
60 | unsigned short runtime_reg; | |
61 | /* The card's boot status */ | |
62 | int boot_status; | |
63 | /* the lock for io operations */ | |
64 | spinlock_t io_lock; | |
65 | } sch311x_wdt_data; | |
66 | ||
67 | /* Module load parameters */ | |
68 | static unsigned short force_id; | |
69 | module_param(force_id, ushort, 0); | |
70 | MODULE_PARM_DESC(force_id, "Override the detected device ID"); | |
71 | ||
72 | static unsigned short therm_trip; | |
73 | module_param(therm_trip, ushort, 0); | |
74 | MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator"); | |
75 | ||
76 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ | |
77 | static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ | |
78 | module_param(timeout, int, 0); | |
79 | MODULE_PARM_DESC(timeout, | |
80 | "Watchdog timeout in seconds. 1<= timeout <=15300, default=" | |
81 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); | |
82 | ||
83 | static int nowayout = WATCHDOG_NOWAYOUT; | |
84 | module_param(nowayout, int, 0); | |
85 | MODULE_PARM_DESC(nowayout, | |
86 | "Watchdog cannot be stopped once started (default=" | |
87 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
88 | ||
89 | /* | |
90 | * Super-IO functions | |
91 | */ | |
92 | ||
93 | static inline void sch311x_sio_enter(int sio_config_port) | |
94 | { | |
95 | outb(0x55, sio_config_port); | |
96 | } | |
97 | ||
98 | static inline void sch311x_sio_exit(int sio_config_port) | |
99 | { | |
100 | outb(0xaa, sio_config_port); | |
101 | } | |
102 | ||
103 | static inline int sch311x_sio_inb(int sio_config_port, int reg) | |
104 | { | |
105 | outb(reg, sio_config_port); | |
106 | return inb(sio_config_port + 1); | |
107 | } | |
108 | ||
109 | static inline void sch311x_sio_outb(int sio_config_port, int reg, int val) | |
110 | { | |
111 | outb(reg, sio_config_port); | |
112 | outb(val, sio_config_port + 1); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Watchdog Operations | |
117 | */ | |
118 | ||
119 | static void sch311x_wdt_set_timeout(int t) | |
120 | { | |
121 | unsigned char timeout_unit = 0x80; | |
122 | ||
123 | /* When new timeout is bigger then 255 seconds, we will use minutes */ | |
124 | if (t > 255) { | |
125 | timeout_unit = 0; | |
126 | t /= 60; | |
127 | } | |
128 | ||
129 | /* -- Watchdog Timeout -- | |
130 | * Bit 0-6 (Reserved) | |
131 | * Bit 7 WDT Time-out Value Units Select | |
132 | * (0 = Minutes, 1 = Seconds) | |
133 | */ | |
134 | outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT); | |
135 | ||
136 | /* -- Watchdog Timer Time-out Value -- | |
137 | * Bit 0-7 Binary coded units (0=Disabled, 1..255) | |
138 | */ | |
139 | outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL); | |
140 | } | |
141 | ||
142 | static void sch311x_wdt_start(void) | |
143 | { | |
144 | spin_lock(&sch311x_wdt_data.io_lock); | |
145 | ||
146 | /* set watchdog's timeout */ | |
147 | sch311x_wdt_set_timeout(timeout); | |
148 | /* enable the watchdog */ | |
149 | /* -- General Purpose I/O Bit 6.0 -- | |
150 | * Bit 0, In/Out: 0 = Output, 1 = Input | |
151 | * Bit 1, Polarity: 0 = No Invert, 1 = Invert | |
152 | * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT, | |
153 | * 10 = Either Edge Triggered Intr.4 | |
154 | * Bit 4-6 (Reserved) | |
155 | * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain | |
156 | */ | |
157 | outb(0x0e, sch311x_wdt_data.runtime_reg + GP60); | |
158 | ||
159 | spin_unlock(&sch311x_wdt_data.io_lock); | |
160 | ||
161 | } | |
162 | ||
163 | static void sch311x_wdt_stop(void) | |
164 | { | |
165 | spin_lock(&sch311x_wdt_data.io_lock); | |
166 | ||
167 | /* stop the watchdog */ | |
168 | outb(0x01, sch311x_wdt_data.runtime_reg + GP60); | |
169 | /* disable timeout by setting it to 0 */ | |
170 | sch311x_wdt_set_timeout(0); | |
171 | ||
172 | spin_unlock(&sch311x_wdt_data.io_lock); | |
173 | } | |
174 | ||
175 | static void sch311x_wdt_keepalive(void) | |
176 | { | |
177 | spin_lock(&sch311x_wdt_data.io_lock); | |
178 | sch311x_wdt_set_timeout(timeout); | |
179 | spin_unlock(&sch311x_wdt_data.io_lock); | |
180 | } | |
181 | ||
182 | static int sch311x_wdt_set_heartbeat(int t) | |
183 | { | |
184 | if (t < 1 || t > (255*60)) | |
185 | return -EINVAL; | |
186 | ||
187 | /* When new timeout is bigger then 255 seconds, | |
188 | * we will round up to minutes (with a max of 255) */ | |
189 | if (t > 255) | |
190 | t = (((t - 1) / 60) + 1) * 60; | |
191 | ||
192 | timeout = t; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static void sch311x_wdt_get_status(int *status) | |
197 | { | |
198 | unsigned char new_status; | |
199 | ||
200 | *status = 0; | |
201 | ||
202 | spin_lock(&sch311x_wdt_data.io_lock); | |
203 | ||
204 | /* -- Watchdog timer control -- | |
25985edc | 205 | * Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occurred |
4c6e63bd WVS |
206 | * Bit 1 Reserved |
207 | * Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning) | |
208 | * Bit 3 P20 Force Timeout enabled: | |
209 | * 0 = P20 activity does not generate the WD timeout event | |
210 | * 1 = P20 Allows rising edge of P20, from the keyboard | |
211 | * controller, to force the WD timeout event. | |
212 | * Bit 4-7 Reserved | |
213 | */ | |
214 | new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL); | |
215 | if (new_status & 0x01) | |
216 | *status |= WDIOF_CARDRESET; | |
217 | ||
218 | spin_unlock(&sch311x_wdt_data.io_lock); | |
219 | } | |
220 | ||
221 | /* | |
222 | * /dev/watchdog handling | |
223 | */ | |
224 | ||
225 | static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf, | |
226 | size_t count, loff_t *ppos) | |
227 | { | |
228 | if (count) { | |
229 | if (!nowayout) { | |
230 | size_t i; | |
231 | ||
232 | sch311x_wdt_expect_close = 0; | |
233 | ||
234 | for (i = 0; i != count; i++) { | |
235 | char c; | |
236 | if (get_user(c, buf + i)) | |
237 | return -EFAULT; | |
238 | if (c == 'V') | |
239 | sch311x_wdt_expect_close = 42; | |
240 | } | |
241 | } | |
242 | sch311x_wdt_keepalive(); | |
243 | } | |
244 | return count; | |
245 | } | |
246 | ||
247 | static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd, | |
248 | unsigned long arg) | |
249 | { | |
250 | int status; | |
251 | int new_timeout; | |
252 | void __user *argp = (void __user *)arg; | |
253 | int __user *p = argp; | |
42747d71 | 254 | static const struct watchdog_info ident = { |
4c6e63bd WVS |
255 | .options = WDIOF_KEEPALIVEPING | |
256 | WDIOF_SETTIMEOUT | | |
257 | WDIOF_MAGICCLOSE, | |
258 | .firmware_version = 1, | |
259 | .identity = DRV_NAME, | |
260 | }; | |
261 | ||
262 | switch (cmd) { | |
263 | case WDIOC_GETSUPPORT: | |
264 | if (copy_to_user(argp, &ident, sizeof(ident))) | |
265 | return -EFAULT; | |
266 | break; | |
267 | ||
268 | case WDIOC_GETSTATUS: | |
269 | { | |
270 | sch311x_wdt_get_status(&status); | |
271 | return put_user(status, p); | |
272 | } | |
273 | case WDIOC_GETBOOTSTATUS: | |
274 | return put_user(sch311x_wdt_data.boot_status, p); | |
275 | ||
276 | case WDIOC_SETOPTIONS: | |
277 | { | |
278 | int options, retval = -EINVAL; | |
279 | ||
280 | if (get_user(options, p)) | |
281 | return -EFAULT; | |
282 | if (options & WDIOS_DISABLECARD) { | |
283 | sch311x_wdt_stop(); | |
284 | retval = 0; | |
285 | } | |
286 | if (options & WDIOS_ENABLECARD) { | |
287 | sch311x_wdt_start(); | |
288 | retval = 0; | |
289 | } | |
290 | return retval; | |
291 | } | |
292 | case WDIOC_KEEPALIVE: | |
293 | sch311x_wdt_keepalive(); | |
294 | break; | |
295 | ||
296 | case WDIOC_SETTIMEOUT: | |
297 | if (get_user(new_timeout, p)) | |
298 | return -EFAULT; | |
299 | if (sch311x_wdt_set_heartbeat(new_timeout)) | |
300 | return -EINVAL; | |
301 | sch311x_wdt_keepalive(); | |
302 | /* Fall */ | |
303 | case WDIOC_GETTIMEOUT: | |
304 | return put_user(timeout, p); | |
305 | default: | |
306 | return -ENOTTY; | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int sch311x_wdt_open(struct inode *inode, struct file *file) | |
312 | { | |
313 | if (test_and_set_bit(0, &sch311x_wdt_is_open)) | |
314 | return -EBUSY; | |
315 | /* | |
316 | * Activate | |
317 | */ | |
318 | sch311x_wdt_start(); | |
319 | return nonseekable_open(inode, file); | |
320 | } | |
321 | ||
322 | static int sch311x_wdt_close(struct inode *inode, struct file *file) | |
323 | { | |
324 | if (sch311x_wdt_expect_close == 42) { | |
325 | sch311x_wdt_stop(); | |
326 | } else { | |
27c766aa | 327 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
4c6e63bd WVS |
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 | ||
4c6e63bd WVS |
475 | static struct platform_driver sch311x_wdt_driver = { |
476 | .probe = sch311x_wdt_probe, | |
477 | .remove = __devexit_p(sch311x_wdt_remove), | |
478 | .shutdown = sch311x_wdt_shutdown, | |
4c6e63bd WVS |
479 | .driver = { |
480 | .owner = THIS_MODULE, | |
481 | .name = DRV_NAME, | |
482 | }, | |
483 | }; | |
484 | ||
485 | static int __init sch311x_detect(int sio_config_port, unsigned short *addr) | |
486 | { | |
487 | int err = 0, reg; | |
488 | unsigned short base_addr; | |
489 | unsigned char dev_id; | |
490 | ||
491 | sch311x_sio_enter(sio_config_port); | |
492 | ||
493 | /* Check device ID. We currently know about: | |
494 | * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */ | |
495 | reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20); | |
496 | if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) { | |
497 | err = -ENODEV; | |
498 | goto exit; | |
499 | } | |
500 | dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6; | |
501 | ||
502 | /* Select logical device A (runtime registers) */ | |
503 | sch311x_sio_outb(sio_config_port, 0x07, 0x0a); | |
504 | ||
505 | /* Check if Logical Device Register is currently active */ | |
6899a8e1 | 506 | if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0) |
27c766aa | 507 | pr_info("Seems that LDN 0x0a is not active...\n"); |
4c6e63bd WVS |
508 | |
509 | /* Get the base address of the runtime registers */ | |
510 | base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) | | |
511 | sch311x_sio_inb(sio_config_port, 0x61); | |
512 | if (!base_addr) { | |
27c766aa | 513 | pr_err("Base address not set\n"); |
4c6e63bd WVS |
514 | err = -ENODEV; |
515 | goto exit; | |
516 | } | |
517 | *addr = base_addr; | |
518 | ||
27c766aa | 519 | pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr); |
4c6e63bd WVS |
520 | |
521 | exit: | |
522 | sch311x_sio_exit(sio_config_port); | |
523 | return err; | |
524 | } | |
525 | ||
526 | static int __init sch311x_wdt_init(void) | |
527 | { | |
528 | int err, i, found = 0; | |
529 | unsigned short addr = 0; | |
530 | ||
531 | for (i = 0; !found && sch311x_ioports[i]; i++) | |
532 | if (sch311x_detect(sch311x_ioports[i], &addr) == 0) | |
533 | found++; | |
534 | ||
535 | if (!found) | |
536 | return -ENODEV; | |
537 | ||
538 | sch311x_wdt_data.runtime_reg = addr; | |
539 | ||
540 | err = platform_driver_register(&sch311x_wdt_driver); | |
541 | if (err) | |
542 | return err; | |
543 | ||
544 | sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr, | |
545 | NULL, 0); | |
546 | ||
547 | if (IS_ERR(sch311x_wdt_pdev)) { | |
548 | err = PTR_ERR(sch311x_wdt_pdev); | |
549 | goto unreg_platform_driver; | |
550 | } | |
551 | ||
552 | return 0; | |
553 | ||
554 | unreg_platform_driver: | |
555 | platform_driver_unregister(&sch311x_wdt_driver); | |
556 | return err; | |
557 | } | |
558 | ||
559 | static void __exit sch311x_wdt_exit(void) | |
560 | { | |
561 | platform_device_unregister(sch311x_wdt_pdev); | |
562 | platform_driver_unregister(&sch311x_wdt_driver); | |
563 | } | |
564 | ||
565 | module_init(sch311x_wdt_init); | |
566 | module_exit(sch311x_wdt_exit); | |
567 | ||
568 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); | |
569 | MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver"); | |
570 | MODULE_LICENSE("GPL"); | |
571 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
572 |