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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / drivers / thermal / thermal.c
blob8b86e53ccf7a081586d32d09350dce072f2ef75e
1 /*
2 * thermal.c - Generic Thermal Management Sysfs support.
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
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/module.h>
27 #include <linux/device.h>
28 #include <linux/err.h>
29 #include <linux/kdev_t.h>
30 #include <linux/idr.h>
31 #include <linux/thermal.h>
32 #include <linux/spinlock.h>
33
34 MODULE_AUTHOR("Zhang Rui")
35 MODULE_DESCRIPTION("Generic thermal management sysfs support");
36 MODULE_LICENSE("GPL");
37
38 #define PREFIX "Thermal: "
39
40 struct thermal_cooling_device_instance {
41 int id;
42 char name[THERMAL_NAME_LENGTH];
43 struct thermal_zone_device *tz;
44 struct thermal_cooling_device *cdev;
45 int trip;
46 char attr_name[THERMAL_NAME_LENGTH];
47 struct device_attribute attr;
48 struct list_head node;
49 };
50
51 static DEFINE_IDR(thermal_tz_idr);
52 static DEFINE_IDR(thermal_cdev_idr);
53 static DEFINE_MUTEX(thermal_idr_lock);
54
55 static LIST_HEAD(thermal_tz_list);
56 static LIST_HEAD(thermal_cdev_list);
57 static DEFINE_MUTEX(thermal_list_lock);
58
59 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
60 {
61 int err;
62
63 again:
64 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
65 return -ENOMEM;
66
67 if (lock)
68 mutex_lock(lock);
69 err = idr_get_new(idr, NULL, id);
70 if (lock)
71 mutex_unlock(lock);
72 if (unlikely(err == -EAGAIN))
73 goto again;
74 else if (unlikely(err))
75 return err;
76
77 *id = *id & MAX_ID_MASK;
78 return 0;
79 }
80
81 static void release_idr(struct idr *idr, struct mutex *lock, int id)
82 {
83 if (lock)
84 mutex_lock(lock);
85 idr_remove(idr, id);
86 if (lock)
87 mutex_unlock(lock);
88 }
89
90 /* sys I/F for thermal zone */
91
92 #define to_thermal_zone(_dev) \
93 container_of(_dev, struct thermal_zone_device, device)
94
95 static ssize_t
96 type_show(struct device *dev, struct device_attribute *attr, char *buf)
97 {
98 struct thermal_zone_device *tz = to_thermal_zone(dev);
99
100 return sprintf(buf, "%s\n", tz->type);
101 }
102
103 static ssize_t
104 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
105 {
106 struct thermal_zone_device *tz = to_thermal_zone(dev);
107
108 if (!tz->ops->get_temp)
109 return -EPERM;
110
111 return tz->ops->get_temp(tz, buf);
112 }
113
114 static ssize_t
115 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
116 {
117 struct thermal_zone_device *tz = to_thermal_zone(dev);
118
119 if (!tz->ops->get_mode)
120 return -EPERM;
121
122 return tz->ops->get_mode(tz, buf);
123 }
124
125 static ssize_t
126 mode_store(struct device *dev, struct device_attribute *attr,
127 const char *buf, size_t count)
128 {
129 struct thermal_zone_device *tz = to_thermal_zone(dev);
130 int result;
131
132 if (!tz->ops->set_mode)
133 return -EPERM;
134
135 result = tz->ops->set_mode(tz, buf);
136 if (result)
137 return result;
138
139 return count;
140 }
141
142 static ssize_t
143 trip_point_type_show(struct device *dev, struct device_attribute *attr,
144 char *buf)
145 {
146 struct thermal_zone_device *tz = to_thermal_zone(dev);
147 int trip;
148
149 if (!tz->ops->get_trip_type)
150 return -EPERM;
151
152 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
153 return -EINVAL;
154
155 return tz->ops->get_trip_type(tz, trip, buf);
156 }
157
158 static ssize_t
159 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
160 char *buf)
161 {
162 struct thermal_zone_device *tz = to_thermal_zone(dev);
163 int trip;
164
165 if (!tz->ops->get_trip_temp)
166 return -EPERM;
167
168 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
169 return -EINVAL;
170
171 return tz->ops->get_trip_temp(tz, trip, buf);
172 }
173
174 static DEVICE_ATTR(type, 0444, type_show, NULL);
175 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
176 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
177
178 static struct device_attribute trip_point_attrs[] = {
179 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
180 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
181 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
182 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
183 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
184 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
185 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
186 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
187 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
188 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
189 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
190 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
191 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
192 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
193 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
194 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
195 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
196 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
197 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
198 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
199 };
200
201 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
202 do { \
203 result = device_create_file(_dev, \
204 &trip_point_attrs[_index * 2]); \
205 if (result) \
206 break; \
207 result = device_create_file(_dev, \
208 &trip_point_attrs[_index * 2 + 1]); \
209 } while (0)
210
211 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
212 do { \
213 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
214 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
215 } while (0)
216
217 /* sys I/F for cooling device */
218 #define to_cooling_device(_dev) \
219 container_of(_dev, struct thermal_cooling_device, device)
220
221 static ssize_t
222 thermal_cooling_device_type_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
224 {
225 struct thermal_cooling_device *cdev = to_cooling_device(dev);
226
227 return sprintf(buf, "%s\n", cdev->type);
228 }
229
230 static ssize_t
231 thermal_cooling_device_max_state_show(struct device *dev,
232 struct device_attribute *attr, char *buf)
233 {
234 struct thermal_cooling_device *cdev = to_cooling_device(dev);
235
236 return cdev->ops->get_max_state(cdev, buf);
237 }
238
239 static ssize_t
240 thermal_cooling_device_cur_state_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242 {
243 struct thermal_cooling_device *cdev = to_cooling_device(dev);
244
245 return cdev->ops->get_cur_state(cdev, buf);
246 }
247
248 static ssize_t
249 thermal_cooling_device_cur_state_store(struct device *dev,
250 struct device_attribute *attr,
251 const char *buf, size_t count)
252 {
253 struct thermal_cooling_device *cdev = to_cooling_device(dev);
254 int state;
255 int result;
256
257 if (!sscanf(buf, "%d\n", &state))
258 return -EINVAL;
259
260 if (state < 0)
261 return -EINVAL;
262
263 result = cdev->ops->set_cur_state(cdev, state);
264 if (result)
265 return result;
266 return count;
267 }
268
269 static struct device_attribute dev_attr_cdev_type =
270 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
271 static DEVICE_ATTR(max_state, 0444,
272 thermal_cooling_device_max_state_show, NULL);
273 static DEVICE_ATTR(cur_state, 0644,
274 thermal_cooling_device_cur_state_show,
275 thermal_cooling_device_cur_state_store);
276
277 static ssize_t
278 thermal_cooling_device_trip_point_show(struct device *dev,
279 struct device_attribute *attr, char *buf)
280 {
281 struct thermal_cooling_device_instance *instance;
282
283 instance =
284 container_of(attr, struct thermal_cooling_device_instance, attr);
285
286 if (instance->trip == THERMAL_TRIPS_NONE)
287 return sprintf(buf, "-1\n");
288 else
289 return sprintf(buf, "%d\n", instance->trip);
290 }
291
292 /* Device management */
293
294 /**
295 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
296 * @tz: thermal zone device
297 * @trip: indicates which trip point the cooling devices is
298 * associated with in this thermal zone.
299 * @cdev: thermal cooling device
300 *
301 * This function is usually called in the thermal zone device .bind callback.
302 */
303 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
304 int trip,
305 struct thermal_cooling_device *cdev)
306 {
307 struct thermal_cooling_device_instance *dev;
308 struct thermal_cooling_device_instance *pos;
309 struct thermal_zone_device *pos1;
310 struct thermal_cooling_device *pos2;
311 int result;
312
313 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
314 return -EINVAL;
315
316 list_for_each_entry(pos1, &thermal_tz_list, node) {
317 if (pos1 == tz)
318 break;
319 }
320 list_for_each_entry(pos2, &thermal_cdev_list, node) {
321 if (pos2 == cdev)
322 break;
323 }
324
325 if (tz != pos1 || cdev != pos2)
326 return -EINVAL;
327
328 dev =
329 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
330 if (!dev)
331 return -ENOMEM;
332 dev->tz = tz;
333 dev->cdev = cdev;
334 dev->trip = trip;
335 result = get_idr(&tz->idr, &tz->lock, &dev->id);
336 if (result)
337 goto free_mem;
338
339 sprintf(dev->name, "cdev%d", dev->id);
340 result =
341 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
342 if (result)
343 goto release_idr;
344
345 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
346 dev->attr.attr.name = dev->attr_name;
347 dev->attr.attr.mode = 0444;
348 dev->attr.show = thermal_cooling_device_trip_point_show;
349 result = device_create_file(&tz->device, &dev->attr);
350 if (result)
351 goto remove_symbol_link;
352
353 mutex_lock(&tz->lock);
354 list_for_each_entry(pos, &tz->cooling_devices, node)
355 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
356 result = -EEXIST;
357 break;
358 }
359 if (!result)
360 list_add_tail(&dev->node, &tz->cooling_devices);
361 mutex_unlock(&tz->lock);
362
363 if (!result)
364 return 0;
365
366 device_remove_file(&tz->device, &dev->attr);
367 remove_symbol_link:
368 sysfs_remove_link(&tz->device.kobj, dev->name);
369 release_idr:
370 release_idr(&tz->idr, &tz->lock, dev->id);
371 free_mem:
372 kfree(dev);
373 return result;
374 }
375
376 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
377
378 /**
379 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
380 * @tz: thermal zone device
381 * @trip: indicates which trip point the cooling devices is
382 * associated with in this thermal zone.
383 * @cdev: thermal cooling device
384 *
385 * This function is usually called in the thermal zone device .unbind callback.
386 */
387 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
388 int trip,
389 struct thermal_cooling_device *cdev)
390 {
391 struct thermal_cooling_device_instance *pos, *next;
392
393 mutex_lock(&tz->lock);
394 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
395 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
396 list_del(&pos->node);
397 mutex_unlock(&tz->lock);
398 goto unbind;
399 }
400 }
401 mutex_unlock(&tz->lock);
402
403 return -ENODEV;
404
405 unbind:
406 device_remove_file(&tz->device, &pos->attr);
407 sysfs_remove_link(&tz->device.kobj, pos->name);
408 release_idr(&tz->idr, &tz->lock, pos->id);
409 kfree(pos);
410 return 0;
411 }
412
413 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
414
415 static void thermal_release(struct device *dev)
416 {
417 struct thermal_zone_device *tz;
418 struct thermal_cooling_device *cdev;
419
420 if (!strncmp(dev->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) {
421 tz = to_thermal_zone(dev);
422 kfree(tz);
423 } else {
424 cdev = to_cooling_device(dev);
425 kfree(cdev);
426 }
427 }
428
429 static struct class thermal_class = {
430 .name = "thermal",
431 .dev_release = thermal_release,
432 };
433
434 /**
435 * thermal_cooling_device_register - register a new thermal cooling device
436 * @type: the thermal cooling device type.
437 * @devdata: device private data.
438 * @ops: standard thermal cooling devices callbacks.
439 */
440 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
441 void *devdata,
442 struct
443 thermal_cooling_device_ops
444 *ops)
445 {
446 struct thermal_cooling_device *cdev;
447 struct thermal_zone_device *pos;
448 int result;
449
450 if (strlen(type) >= THERMAL_NAME_LENGTH)
451 return ERR_PTR(-EINVAL);
452
453 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
454 !ops->set_cur_state)
455 return ERR_PTR(-EINVAL);
456
457 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
458 if (!cdev)
459 return ERR_PTR(-ENOMEM);
460
461 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
462 if (result) {
463 kfree(cdev);
464 return ERR_PTR(result);
465 }
466
467 strcpy(cdev->type, type);
468 cdev->ops = ops;
469 cdev->device.class = &thermal_class;
470 cdev->devdata = devdata;
471 sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id);
472 result = device_register(&cdev->device);
473 if (result) {
474 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
475 kfree(cdev);
476 return ERR_PTR(result);
477 }
478
479 /* sys I/F */
480 if (type) {
481 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
482 if (result)
483 goto unregister;
484 }
485
486 result = device_create_file(&cdev->device, &dev_attr_max_state);
487 if (result)
488 goto unregister;
489
490 result = device_create_file(&cdev->device, &dev_attr_cur_state);
491 if (result)
492 goto unregister;
493
494 mutex_lock(&thermal_list_lock);
495 list_add(&cdev->node, &thermal_cdev_list);
496 list_for_each_entry(pos, &thermal_tz_list, node) {
497 if (!pos->ops->bind)
498 continue;
499 result = pos->ops->bind(pos, cdev);
500 if (result)
501 break;
502
503 }
504 mutex_unlock(&thermal_list_lock);
505
506 if (!result)
507 return cdev;
508
509 unregister:
510 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
511 device_unregister(&cdev->device);
512 return ERR_PTR(result);
513 }
514
515 EXPORT_SYMBOL(thermal_cooling_device_register);
516
517 /**
518 * thermal_cooling_device_unregister - removes the registered thermal cooling device
519 * @cdev: the thermal cooling device to remove.
520 *
521 * thermal_cooling_device_unregister() must be called when the device is no
522 * longer needed.
523 */
524 void thermal_cooling_device_unregister(struct
525 thermal_cooling_device
526 *cdev)
527 {
528 struct thermal_zone_device *tz;
529 struct thermal_cooling_device *pos = NULL;
530
531 if (!cdev)
532 return;
533
534 mutex_lock(&thermal_list_lock);
535 list_for_each_entry(pos, &thermal_cdev_list, node)
536 if (pos == cdev)
537 break;
538 if (pos != cdev) {
539 /* thermal cooling device not found */
540 mutex_unlock(&thermal_list_lock);
541 return;
542 }
543 list_del(&cdev->node);
544 list_for_each_entry(tz, &thermal_tz_list, node) {
545 if (!tz->ops->unbind)
546 continue;
547 tz->ops->unbind(tz, cdev);
548 }
549 mutex_unlock(&thermal_list_lock);
550 if (cdev->type[0])
551 device_remove_file(&cdev->device, &dev_attr_cdev_type);
552 device_remove_file(&cdev->device, &dev_attr_max_state);
553 device_remove_file(&cdev->device, &dev_attr_cur_state);
554
555 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
556 device_unregister(&cdev->device);
557 return;
558 }
559
560 EXPORT_SYMBOL(thermal_cooling_device_unregister);
561
562 /**
563 * thermal_zone_device_register - register a new thermal zone device
564 * @type: the thermal zone device type
565 * @trips: the number of trip points the thermal zone support
566 * @devdata: private device data
567 * @ops: standard thermal zone device callbacks
568 *
569 * thermal_zone_device_unregister() must be called when the device is no
570 * longer needed.
571 */
572 struct thermal_zone_device *thermal_zone_device_register(char *type,
573 int trips,
574 void *devdata, struct
575 thermal_zone_device_ops
576 *ops)
577 {
578 struct thermal_zone_device *tz;
579 struct thermal_cooling_device *pos;
580 int result;
581 int count;
582
583 if (strlen(type) >= THERMAL_NAME_LENGTH)
584 return ERR_PTR(-EINVAL);
585
586 if (trips > THERMAL_MAX_TRIPS || trips < 0)
587 return ERR_PTR(-EINVAL);
588
589 if (!ops || !ops->get_temp)
590 return ERR_PTR(-EINVAL);
591
592 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
593 if (!tz)
594 return ERR_PTR(-ENOMEM);
595
596 INIT_LIST_HEAD(&tz->cooling_devices);
597 idr_init(&tz->idr);
598 mutex_init(&tz->lock);
599 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
600 if (result) {
601 kfree(tz);
602 return ERR_PTR(result);
603 }
604
605 strcpy(tz->type, type);
606 tz->ops = ops;
607 tz->device.class = &thermal_class;
608 tz->devdata = devdata;
609 tz->trips = trips;
610 sprintf(tz->device.bus_id, "thermal_zone%d", tz->id);
611 result = device_register(&tz->device);
612 if (result) {
613 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
614 kfree(tz);
615 return ERR_PTR(result);
616 }
617
618 /* sys I/F */
619 if (type) {
620 result = device_create_file(&tz->device, &dev_attr_type);
621 if (result)
622 goto unregister;
623 }
624
625 result = device_create_file(&tz->device, &dev_attr_temp);
626 if (result)
627 goto unregister;
628
629 if (ops->get_mode) {
630 result = device_create_file(&tz->device, &dev_attr_mode);
631 if (result)
632 goto unregister;
633 }
634
635 for (count = 0; count < trips; count++) {
636 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
637 if (result)
638 goto unregister;
639 }
640
641 mutex_lock(&thermal_list_lock);
642 list_add_tail(&tz->node, &thermal_tz_list);
643 if (ops->bind)
644 list_for_each_entry(pos, &thermal_cdev_list, node) {
645 result = ops->bind(tz, pos);
646 if (result)
647 break;
648 }
649 mutex_unlock(&thermal_list_lock);
650
651 if (!result)
652 return tz;
653
654 unregister:
655 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
656 device_unregister(&tz->device);
657 return ERR_PTR(result);
658 }
659
660 EXPORT_SYMBOL(thermal_zone_device_register);
661
662 /**
663 * thermal_device_unregister - removes the registered thermal zone device
664 * @tz: the thermal zone device to remove
665 */
666 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
667 {
668 struct thermal_cooling_device *cdev;
669 struct thermal_zone_device *pos = NULL;
670 int count;
671
672 if (!tz)
673 return;
674
675 mutex_lock(&thermal_list_lock);
676 list_for_each_entry(pos, &thermal_tz_list, node)
677 if (pos == tz)
678 break;
679 if (pos != tz) {
680 /* thermal zone device not found */
681 mutex_unlock(&thermal_list_lock);
682 return;
683 }
684 list_del(&tz->node);
685 if (tz->ops->unbind)
686 list_for_each_entry(cdev, &thermal_cdev_list, node)
687 tz->ops->unbind(tz, cdev);
688 mutex_unlock(&thermal_list_lock);
689
690 if (tz->type[0])
691 device_remove_file(&tz->device, &dev_attr_type);
692 device_remove_file(&tz->device, &dev_attr_temp);
693 if (tz->ops->get_mode)
694 device_remove_file(&tz->device, &dev_attr_mode);
695
696 for (count = 0; count < tz->trips; count++)
697 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
698
699 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
700 idr_destroy(&tz->idr);
701 mutex_destroy(&tz->lock);
702 device_unregister(&tz->device);
703 return;
704 }
705
706 EXPORT_SYMBOL(thermal_zone_device_unregister);
707
708 static int __init thermal_init(void)
709 {
710 int result = 0;
711
712 result = class_register(&thermal_class);
713 if (result) {
714 idr_destroy(&thermal_tz_idr);
715 idr_destroy(&thermal_cdev_idr);
716 mutex_destroy(&thermal_idr_lock);
717 mutex_destroy(&thermal_list_lock);
718 }
719 return result;
720 }
721
722 static void __exit thermal_exit(void)
723 {
724 class_unregister(&thermal_class);
725 idr_destroy(&thermal_tz_idr);
726 idr_destroy(&thermal_cdev_idr);
727 mutex_destroy(&thermal_idr_lock);
728 mutex_destroy(&thermal_list_lock);
729 }
730
731 subsys_initcall(thermal_init);
732 module_exit(thermal_exit);
WRT350N Kernel Patches