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1da177e4 LT |
1 | /* |
2 | * acpi_button.c - ACPI Button Driver ($Revision: 30 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/seq_file.h> | |
32 | #include <acpi/acpi_bus.h> | |
33 | #include <acpi/acpi_drivers.h> | |
34 | ||
35 | ||
36 | #define ACPI_BUTTON_COMPONENT 0x00080000 | |
37 | #define ACPI_BUTTON_DRIVER_NAME "ACPI Button Driver" | |
38 | #define ACPI_BUTTON_CLASS "button" | |
39 | #define ACPI_BUTTON_FILE_INFO "info" | |
40 | #define ACPI_BUTTON_FILE_STATE "state" | |
41 | #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 | |
42 | #define ACPI_BUTTON_NOTIFY_STATUS 0x80 | |
43 | ||
44 | #define ACPI_BUTTON_SUBCLASS_POWER "power" | |
45 | #define ACPI_BUTTON_HID_POWER "PNP0C0C" | |
46 | #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button (CM)" | |
47 | #define ACPI_BUTTON_DEVICE_NAME_POWERF "Power Button (FF)" | |
48 | #define ACPI_BUTTON_TYPE_POWER 0x01 | |
49 | #define ACPI_BUTTON_TYPE_POWERF 0x02 | |
50 | ||
51 | #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" | |
52 | #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" | |
53 | #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button (CM)" | |
54 | #define ACPI_BUTTON_DEVICE_NAME_SLEEPF "Sleep Button (FF)" | |
55 | #define ACPI_BUTTON_TYPE_SLEEP 0x03 | |
56 | #define ACPI_BUTTON_TYPE_SLEEPF 0x04 | |
57 | ||
58 | #define ACPI_BUTTON_SUBCLASS_LID "lid" | |
59 | #define ACPI_BUTTON_HID_LID "PNP0C0D" | |
60 | #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" | |
61 | #define ACPI_BUTTON_TYPE_LID 0x05 | |
62 | ||
63 | #define _COMPONENT ACPI_BUTTON_COMPONENT | |
64 | ACPI_MODULE_NAME ("acpi_button") | |
65 | ||
66 | MODULE_AUTHOR("Paul Diefenbaugh"); | |
67 | MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME); | |
68 | MODULE_LICENSE("GPL"); | |
69 | ||
70 | ||
71 | static int acpi_button_add (struct acpi_device *device); | |
72 | static int acpi_button_remove (struct acpi_device *device, int type); | |
73 | static int acpi_button_info_open_fs(struct inode *inode, struct file *file); | |
74 | static int acpi_button_state_open_fs(struct inode *inode, struct file *file); | |
75 | ||
76 | static struct acpi_driver acpi_button_driver = { | |
77 | .name = ACPI_BUTTON_DRIVER_NAME, | |
78 | .class = ACPI_BUTTON_CLASS, | |
79 | .ids = "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E", | |
80 | .ops = { | |
81 | .add = acpi_button_add, | |
82 | .remove = acpi_button_remove, | |
83 | }, | |
84 | }; | |
85 | ||
86 | struct acpi_button { | |
87 | acpi_handle handle; | |
88 | struct acpi_device *device; /* Fixed button kludge */ | |
89 | u8 type; | |
90 | unsigned long pushed; | |
91 | }; | |
92 | ||
93 | static struct file_operations acpi_button_info_fops = { | |
94 | .open = acpi_button_info_open_fs, | |
95 | .read = seq_read, | |
96 | .llseek = seq_lseek, | |
97 | .release = single_release, | |
98 | }; | |
99 | ||
100 | static struct file_operations acpi_button_state_fops = { | |
101 | .open = acpi_button_state_open_fs, | |
102 | .read = seq_read, | |
103 | .llseek = seq_lseek, | |
104 | .release = single_release, | |
105 | }; | |
106 | /* -------------------------------------------------------------------------- | |
107 | FS Interface (/proc) | |
108 | -------------------------------------------------------------------------- */ | |
109 | ||
110 | static struct proc_dir_entry *acpi_button_dir; | |
111 | ||
112 | static int acpi_button_info_seq_show(struct seq_file *seq, void *offset) | |
113 | { | |
114 | struct acpi_button *button = (struct acpi_button *) seq->private; | |
115 | ||
116 | ACPI_FUNCTION_TRACE("acpi_button_info_seq_show"); | |
117 | ||
118 | if (!button || !button->device) | |
119 | return_VALUE(0); | |
120 | ||
121 | seq_printf(seq, "type: %s\n", | |
122 | acpi_device_name(button->device)); | |
123 | ||
124 | return_VALUE(0); | |
125 | } | |
126 | ||
127 | static int acpi_button_info_open_fs(struct inode *inode, struct file *file) | |
128 | { | |
129 | return single_open(file, acpi_button_info_seq_show, PDE(inode)->data); | |
130 | } | |
131 | ||
132 | static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) | |
133 | { | |
134 | struct acpi_button *button = (struct acpi_button *) seq->private; | |
135 | acpi_status status; | |
136 | unsigned long state; | |
137 | ||
138 | ACPI_FUNCTION_TRACE("acpi_button_state_seq_show"); | |
139 | ||
140 | if (!button || !button->device) | |
141 | return_VALUE(0); | |
142 | ||
143 | status = acpi_evaluate_integer(button->handle,"_LID",NULL,&state); | |
144 | if (ACPI_FAILURE(status)) { | |
145 | seq_printf(seq, "state: unsupported\n"); | |
146 | } | |
147 | else{ | |
148 | seq_printf(seq, "state: %s\n", (state ? "open" : "closed")); | |
149 | } | |
150 | ||
151 | return_VALUE(0); | |
152 | } | |
153 | ||
154 | static int acpi_button_state_open_fs(struct inode *inode, struct file *file) | |
155 | { | |
156 | return single_open(file, acpi_button_state_seq_show, PDE(inode)->data); | |
157 | } | |
158 | ||
159 | static int | |
160 | acpi_button_add_fs ( | |
161 | struct acpi_device *device) | |
162 | { | |
163 | struct proc_dir_entry *entry = NULL; | |
164 | struct acpi_button *button = NULL; | |
165 | ||
166 | ACPI_FUNCTION_TRACE("acpi_button_add_fs"); | |
167 | ||
168 | if (!device || !acpi_driver_data(device)) | |
169 | return_VALUE(-EINVAL); | |
170 | ||
171 | button = acpi_driver_data(device); | |
172 | ||
173 | switch (button->type) { | |
174 | case ACPI_BUTTON_TYPE_POWER: | |
175 | case ACPI_BUTTON_TYPE_POWERF: | |
176 | entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER, | |
177 | acpi_button_dir); | |
178 | break; | |
179 | case ACPI_BUTTON_TYPE_SLEEP: | |
180 | case ACPI_BUTTON_TYPE_SLEEPF: | |
181 | entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP, | |
182 | acpi_button_dir); | |
183 | break; | |
184 | case ACPI_BUTTON_TYPE_LID: | |
185 | entry = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, | |
186 | acpi_button_dir); | |
187 | break; | |
188 | } | |
189 | ||
190 | if (!entry) | |
191 | return_VALUE(-ENODEV); | |
192 | entry->owner = THIS_MODULE; | |
193 | ||
194 | acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry); | |
195 | if (!acpi_device_dir(device)) | |
196 | return_VALUE(-ENODEV); | |
197 | acpi_device_dir(device)->owner = THIS_MODULE; | |
198 | ||
199 | /* 'info' [R] */ | |
200 | entry = create_proc_entry(ACPI_BUTTON_FILE_INFO, | |
201 | S_IRUGO, acpi_device_dir(device)); | |
202 | if (!entry) | |
203 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
204 | "Unable to create '%s' fs entry\n", | |
205 | ACPI_BUTTON_FILE_INFO)); | |
206 | else { | |
207 | entry->proc_fops = &acpi_button_info_fops; | |
208 | entry->data = acpi_driver_data(device); | |
209 | entry->owner = THIS_MODULE; | |
210 | } | |
211 | ||
212 | /* show lid state [R] */ | |
213 | if (button->type == ACPI_BUTTON_TYPE_LID) { | |
214 | entry = create_proc_entry(ACPI_BUTTON_FILE_STATE, | |
215 | S_IRUGO, acpi_device_dir(device)); | |
216 | if (!entry) | |
217 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
218 | "Unable to create '%s' fs entry\n", | |
219 | ACPI_BUTTON_FILE_INFO)); | |
220 | else { | |
221 | entry->proc_fops = &acpi_button_state_fops; | |
222 | entry->data = acpi_driver_data(device); | |
223 | entry->owner = THIS_MODULE; | |
224 | } | |
225 | } | |
226 | ||
227 | return_VALUE(0); | |
228 | } | |
229 | ||
230 | ||
231 | static int | |
232 | acpi_button_remove_fs ( | |
233 | struct acpi_device *device) | |
234 | { | |
235 | struct acpi_button *button = NULL; | |
236 | ||
237 | ACPI_FUNCTION_TRACE("acpi_button_remove_fs"); | |
238 | ||
239 | button = acpi_driver_data(device); | |
240 | if (acpi_device_dir(device)) { | |
241 | if (button->type == ACPI_BUTTON_TYPE_LID) | |
242 | remove_proc_entry(ACPI_BUTTON_FILE_STATE, | |
243 | acpi_device_dir(device)); | |
244 | remove_proc_entry(ACPI_BUTTON_FILE_INFO, | |
245 | acpi_device_dir(device)); | |
246 | ||
247 | remove_proc_entry(acpi_device_bid(device), | |
248 | acpi_device_dir(device)->parent); | |
249 | ||
250 | ||
251 | switch (button->type) { | |
252 | case ACPI_BUTTON_TYPE_POWER: | |
253 | case ACPI_BUTTON_TYPE_POWERF: | |
254 | remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, | |
255 | acpi_button_dir); | |
256 | break; | |
257 | case ACPI_BUTTON_TYPE_SLEEP: | |
258 | case ACPI_BUTTON_TYPE_SLEEPF: | |
259 | remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, | |
260 | acpi_button_dir); | |
261 | break; | |
262 | case ACPI_BUTTON_TYPE_LID: | |
263 | remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, | |
264 | acpi_button_dir); | |
265 | break; | |
266 | } | |
267 | acpi_device_dir(device) = NULL; | |
268 | } | |
269 | ||
270 | return_VALUE(0); | |
271 | } | |
272 | ||
273 | ||
274 | /* -------------------------------------------------------------------------- | |
275 | Driver Interface | |
276 | -------------------------------------------------------------------------- */ | |
277 | ||
278 | static void | |
279 | acpi_button_notify ( | |
280 | acpi_handle handle, | |
281 | u32 event, | |
282 | void *data) | |
283 | { | |
284 | struct acpi_button *button = (struct acpi_button *) data; | |
285 | ||
286 | ACPI_FUNCTION_TRACE("acpi_button_notify"); | |
287 | ||
288 | if (!button || !button->device) | |
289 | return_VOID; | |
290 | ||
291 | switch (event) { | |
292 | case ACPI_BUTTON_NOTIFY_STATUS: | |
293 | acpi_bus_generate_event(button->device, event, ++button->pushed); | |
294 | break; | |
295 | default: | |
296 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
297 | "Unsupported event [0x%x]\n", event)); | |
298 | break; | |
299 | } | |
300 | ||
301 | return_VOID; | |
302 | } | |
303 | ||
304 | ||
305 | static acpi_status | |
306 | acpi_button_notify_fixed ( | |
307 | void *data) | |
308 | { | |
309 | struct acpi_button *button = (struct acpi_button *) data; | |
310 | ||
311 | ACPI_FUNCTION_TRACE("acpi_button_notify_fixed"); | |
312 | ||
313 | if (!button) | |
314 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
315 | ||
316 | acpi_button_notify(button->handle, ACPI_BUTTON_NOTIFY_STATUS, button); | |
317 | ||
318 | return_ACPI_STATUS(AE_OK); | |
319 | } | |
320 | ||
321 | ||
322 | static int | |
323 | acpi_button_add ( | |
324 | struct acpi_device *device) | |
325 | { | |
326 | int result = 0; | |
327 | acpi_status status = AE_OK; | |
328 | struct acpi_button *button = NULL; | |
329 | ||
330 | static struct acpi_device *power_button; | |
331 | static struct acpi_device *sleep_button; | |
332 | static struct acpi_device *lid_button; | |
333 | ||
334 | ACPI_FUNCTION_TRACE("acpi_button_add"); | |
335 | ||
336 | if (!device) | |
337 | return_VALUE(-EINVAL); | |
338 | ||
339 | button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL); | |
340 | if (!button) | |
341 | return_VALUE(-ENOMEM); | |
342 | memset(button, 0, sizeof(struct acpi_button)); | |
343 | ||
344 | button->device = device; | |
345 | button->handle = device->handle; | |
346 | acpi_driver_data(device) = button; | |
347 | ||
348 | /* | |
349 | * Determine the button type (via hid), as fixed-feature buttons | |
350 | * need to be handled a bit differently than generic-space. | |
351 | */ | |
352 | if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) { | |
353 | button->type = ACPI_BUTTON_TYPE_POWER; | |
354 | strcpy(acpi_device_name(device), | |
355 | ACPI_BUTTON_DEVICE_NAME_POWER); | |
356 | sprintf(acpi_device_class(device), "%s/%s", | |
357 | ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); | |
358 | } | |
359 | else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) { | |
360 | button->type = ACPI_BUTTON_TYPE_POWERF; | |
361 | strcpy(acpi_device_name(device), | |
362 | ACPI_BUTTON_DEVICE_NAME_POWERF); | |
363 | sprintf(acpi_device_class(device), "%s/%s", | |
364 | ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); | |
365 | } | |
366 | else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) { | |
367 | button->type = ACPI_BUTTON_TYPE_SLEEP; | |
368 | strcpy(acpi_device_name(device), | |
369 | ACPI_BUTTON_DEVICE_NAME_SLEEP); | |
370 | sprintf(acpi_device_class(device), "%s/%s", | |
371 | ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); | |
372 | } | |
373 | else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) { | |
374 | button->type = ACPI_BUTTON_TYPE_SLEEPF; | |
375 | strcpy(acpi_device_name(device), | |
376 | ACPI_BUTTON_DEVICE_NAME_SLEEPF); | |
377 | sprintf(acpi_device_class(device), "%s/%s", | |
378 | ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); | |
379 | } | |
380 | else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) { | |
381 | button->type = ACPI_BUTTON_TYPE_LID; | |
382 | strcpy(acpi_device_name(device), | |
383 | ACPI_BUTTON_DEVICE_NAME_LID); | |
384 | sprintf(acpi_device_class(device), "%s/%s", | |
385 | ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); | |
386 | } | |
387 | else { | |
388 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported hid [%s]\n", | |
389 | acpi_device_hid(device))); | |
390 | result = -ENODEV; | |
391 | goto end; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Ensure only one button of each type is used. | |
396 | */ | |
397 | switch (button->type) { | |
398 | case ACPI_BUTTON_TYPE_POWER: | |
399 | case ACPI_BUTTON_TYPE_POWERF: | |
400 | if (!power_button) | |
401 | power_button = device; | |
402 | else { | |
403 | kfree(button); | |
404 | return_VALUE(-ENODEV); | |
405 | } | |
406 | break; | |
407 | case ACPI_BUTTON_TYPE_SLEEP: | |
408 | case ACPI_BUTTON_TYPE_SLEEPF: | |
409 | if (!sleep_button) | |
410 | sleep_button = device; | |
411 | else { | |
412 | kfree(button); | |
413 | return_VALUE(-ENODEV); | |
414 | } | |
415 | break; | |
416 | case ACPI_BUTTON_TYPE_LID: | |
417 | if (!lid_button) | |
418 | lid_button = device; | |
419 | else { | |
420 | kfree(button); | |
421 | return_VALUE(-ENODEV); | |
422 | } | |
423 | break; | |
424 | } | |
425 | ||
426 | result = acpi_button_add_fs(device); | |
427 | if (result) | |
428 | goto end; | |
429 | ||
430 | switch (button->type) { | |
431 | case ACPI_BUTTON_TYPE_POWERF: | |
432 | status = acpi_install_fixed_event_handler ( | |
433 | ACPI_EVENT_POWER_BUTTON, | |
434 | acpi_button_notify_fixed, | |
435 | button); | |
436 | break; | |
437 | case ACPI_BUTTON_TYPE_SLEEPF: | |
438 | status = acpi_install_fixed_event_handler ( | |
439 | ACPI_EVENT_SLEEP_BUTTON, | |
440 | acpi_button_notify_fixed, | |
441 | button); | |
442 | break; | |
443 | default: | |
444 | status = acpi_install_notify_handler ( | |
445 | button->handle, | |
446 | ACPI_DEVICE_NOTIFY, | |
447 | acpi_button_notify, | |
448 | button); | |
449 | break; | |
450 | } | |
451 | ||
452 | if (ACPI_FAILURE(status)) { | |
453 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
454 | "Error installing notify handler\n")); | |
455 | result = -ENODEV; | |
456 | goto end; | |
457 | } | |
458 | ||
459 | if (device->wakeup.flags.valid) { | |
460 | /* Button's GPE is run-wake GPE */ | |
461 | acpi_set_gpe_type(device->wakeup.gpe_device, | |
462 | device->wakeup.gpe_number, ACPI_GPE_TYPE_WAKE_RUN); | |
463 | acpi_enable_gpe(device->wakeup.gpe_device, | |
464 | device->wakeup.gpe_number, ACPI_NOT_ISR); | |
465 | device->wakeup.state.enabled = 1; | |
466 | } | |
467 | ||
468 | printk(KERN_INFO PREFIX "%s [%s]\n", | |
469 | acpi_device_name(device), acpi_device_bid(device)); | |
470 | ||
471 | end: | |
472 | if (result) { | |
473 | acpi_button_remove_fs(device); | |
474 | kfree(button); | |
475 | } | |
476 | ||
477 | return_VALUE(result); | |
478 | } | |
479 | ||
480 | ||
481 | static int | |
482 | acpi_button_remove (struct acpi_device *device, int type) | |
483 | { | |
484 | acpi_status status = 0; | |
485 | struct acpi_button *button = NULL; | |
486 | ||
487 | ACPI_FUNCTION_TRACE("acpi_button_remove"); | |
488 | ||
489 | if (!device || !acpi_driver_data(device)) | |
490 | return_VALUE(-EINVAL); | |
491 | ||
492 | button = acpi_driver_data(device); | |
493 | ||
494 | /* Unregister for device notifications. */ | |
495 | switch (button->type) { | |
496 | case ACPI_BUTTON_TYPE_POWERF: | |
497 | status = acpi_remove_fixed_event_handler( | |
498 | ACPI_EVENT_POWER_BUTTON, acpi_button_notify_fixed); | |
499 | break; | |
500 | case ACPI_BUTTON_TYPE_SLEEPF: | |
501 | status = acpi_remove_fixed_event_handler( | |
502 | ACPI_EVENT_SLEEP_BUTTON, acpi_button_notify_fixed); | |
503 | break; | |
504 | default: | |
505 | status = acpi_remove_notify_handler(button->handle, | |
506 | ACPI_DEVICE_NOTIFY, acpi_button_notify); | |
507 | break; | |
508 | } | |
509 | ||
510 | if (ACPI_FAILURE(status)) | |
511 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, | |
512 | "Error removing notify handler\n")); | |
513 | ||
514 | acpi_button_remove_fs(device); | |
515 | ||
516 | kfree(button); | |
517 | ||
518 | return_VALUE(0); | |
519 | } | |
520 | ||
521 | ||
522 | static int __init | |
523 | acpi_button_init (void) | |
524 | { | |
525 | int result = 0; | |
526 | ||
527 | ACPI_FUNCTION_TRACE("acpi_button_init"); | |
528 | ||
529 | acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); | |
530 | if (!acpi_button_dir) | |
531 | return_VALUE(-ENODEV); | |
532 | acpi_button_dir->owner = THIS_MODULE; | |
533 | ||
534 | result = acpi_bus_register_driver(&acpi_button_driver); | |
535 | if (result < 0) { | |
536 | remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); | |
537 | return_VALUE(-ENODEV); | |
538 | } | |
539 | ||
540 | return_VALUE(0); | |
541 | } | |
542 | ||
543 | ||
544 | static void __exit | |
545 | acpi_button_exit (void) | |
546 | { | |
547 | ACPI_FUNCTION_TRACE("acpi_button_exit"); | |
548 | ||
549 | acpi_bus_unregister_driver(&acpi_button_driver); | |
550 | ||
551 | remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); | |
552 | ||
553 | return_VOID; | |
554 | } | |
555 | ||
556 | ||
557 | module_init(acpi_button_init); | |
558 | module_exit(acpi_button_exit); |