thermal: make THERMAL_HWMON implementation fully internal
[linux-2.6.git] / drivers / thermal / thermal_sys.c
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/slab.h>
30 #include <linux/kdev_t.h>
31 #include <linux/idr.h>
32 #include <linux/thermal.h>
33 #include <linux/spinlock.h>
34 #include <linux/reboot.h>
35 #include <net/netlink.h>
36 #include <net/genetlink.h>
37
38 MODULE_AUTHOR("Zhang Rui");
39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
40 MODULE_LICENSE("GPL");
41
42 #define PREFIX "Thermal: "
43
44 struct thermal_cooling_device_instance {
45         int id;
46         char name[THERMAL_NAME_LENGTH];
47         struct thermal_zone_device *tz;
48         struct thermal_cooling_device *cdev;
49         int trip;
50         char attr_name[THERMAL_NAME_LENGTH];
51         struct device_attribute attr;
52         struct list_head node;
53 };
54
55 static DEFINE_IDR(thermal_tz_idr);
56 static DEFINE_IDR(thermal_cdev_idr);
57 static DEFINE_MUTEX(thermal_idr_lock);
58
59 static LIST_HEAD(thermal_tz_list);
60 static LIST_HEAD(thermal_cdev_list);
61 static DEFINE_MUTEX(thermal_list_lock);
62
63 static unsigned int thermal_event_seqnum;
64
65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
66 {
67         int err;
68
69       again:
70         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
71                 return -ENOMEM;
72
73         if (lock)
74                 mutex_lock(lock);
75         err = idr_get_new(idr, NULL, id);
76         if (lock)
77                 mutex_unlock(lock);
78         if (unlikely(err == -EAGAIN))
79                 goto again;
80         else if (unlikely(err))
81                 return err;
82
83         *id = *id & MAX_ID_MASK;
84         return 0;
85 }
86
87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
88 {
89         if (lock)
90                 mutex_lock(lock);
91         idr_remove(idr, id);
92         if (lock)
93                 mutex_unlock(lock);
94 }
95
96 /* sys I/F for thermal zone */
97
98 #define to_thermal_zone(_dev) \
99         container_of(_dev, struct thermal_zone_device, device)
100
101 static ssize_t
102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
103 {
104         struct thermal_zone_device *tz = to_thermal_zone(dev);
105
106         return sprintf(buf, "%s\n", tz->type);
107 }
108
109 static ssize_t
110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
111 {
112         struct thermal_zone_device *tz = to_thermal_zone(dev);
113         long temperature;
114         int ret;
115
116         if (!tz->ops->get_temp)
117                 return -EPERM;
118
119         ret = tz->ops->get_temp(tz, &temperature);
120
121         if (ret)
122                 return ret;
123
124         return sprintf(buf, "%ld\n", temperature);
125 }
126
127 static ssize_t
128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
129 {
130         struct thermal_zone_device *tz = to_thermal_zone(dev);
131         enum thermal_device_mode mode;
132         int result;
133
134         if (!tz->ops->get_mode)
135                 return -EPERM;
136
137         result = tz->ops->get_mode(tz, &mode);
138         if (result)
139                 return result;
140
141         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
142                        : "disabled");
143 }
144
145 static ssize_t
146 mode_store(struct device *dev, struct device_attribute *attr,
147            const char *buf, size_t count)
148 {
149         struct thermal_zone_device *tz = to_thermal_zone(dev);
150         int result;
151
152         if (!tz->ops->set_mode)
153                 return -EPERM;
154
155         if (!strncmp(buf, "enabled", sizeof("enabled")))
156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
157         else if (!strncmp(buf, "disabled", sizeof("disabled")))
158                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
159         else
160                 result = -EINVAL;
161
162         if (result)
163                 return result;
164
165         return count;
166 }
167
168 static ssize_t
169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
170                      char *buf)
171 {
172         struct thermal_zone_device *tz = to_thermal_zone(dev);
173         enum thermal_trip_type type;
174         int trip, result;
175
176         if (!tz->ops->get_trip_type)
177                 return -EPERM;
178
179         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
180                 return -EINVAL;
181
182         result = tz->ops->get_trip_type(tz, trip, &type);
183         if (result)
184                 return result;
185
186         switch (type) {
187         case THERMAL_TRIP_CRITICAL:
188                 return sprintf(buf, "critical\n");
189         case THERMAL_TRIP_HOT:
190                 return sprintf(buf, "hot\n");
191         case THERMAL_TRIP_PASSIVE:
192                 return sprintf(buf, "passive\n");
193         case THERMAL_TRIP_ACTIVE:
194                 return sprintf(buf, "active\n");
195         default:
196                 return sprintf(buf, "unknown\n");
197         }
198 }
199
200 static ssize_t
201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
202                      char *buf)
203 {
204         struct thermal_zone_device *tz = to_thermal_zone(dev);
205         int trip, ret;
206         long temperature;
207
208         if (!tz->ops->get_trip_temp)
209                 return -EPERM;
210
211         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
212                 return -EINVAL;
213
214         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
215
216         if (ret)
217                 return ret;
218
219         return sprintf(buf, "%ld\n", temperature);
220 }
221
222 static ssize_t
223 passive_store(struct device *dev, struct device_attribute *attr,
224                     const char *buf, size_t count)
225 {
226         struct thermal_zone_device *tz = to_thermal_zone(dev);
227         struct thermal_cooling_device *cdev = NULL;
228         int state;
229
230         if (!sscanf(buf, "%d\n", &state))
231                 return -EINVAL;
232
233         /* sanity check: values below 1000 millicelcius don't make sense
234          * and can cause the system to go into a thermal heart attack
235          */
236         if (state && state < 1000)
237                 return -EINVAL;
238
239         if (state && !tz->forced_passive) {
240                 mutex_lock(&thermal_list_lock);
241                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
242                         if (!strncmp("Processor", cdev->type,
243                                      sizeof("Processor")))
244                                 thermal_zone_bind_cooling_device(tz,
245                                                                  THERMAL_TRIPS_NONE,
246                                                                  cdev);
247                 }
248                 mutex_unlock(&thermal_list_lock);
249                 if (!tz->passive_delay)
250                         tz->passive_delay = 1000;
251         } else if (!state && tz->forced_passive) {
252                 mutex_lock(&thermal_list_lock);
253                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
254                         if (!strncmp("Processor", cdev->type,
255                                      sizeof("Processor")))
256                                 thermal_zone_unbind_cooling_device(tz,
257                                                                    THERMAL_TRIPS_NONE,
258                                                                    cdev);
259                 }
260                 mutex_unlock(&thermal_list_lock);
261                 tz->passive_delay = 0;
262         }
263
264         tz->tc1 = 1;
265         tz->tc2 = 1;
266
267         tz->forced_passive = state;
268
269         thermal_zone_device_update(tz);
270
271         return count;
272 }
273
274 static ssize_t
275 passive_show(struct device *dev, struct device_attribute *attr,
276                    char *buf)
277 {
278         struct thermal_zone_device *tz = to_thermal_zone(dev);
279
280         return sprintf(buf, "%d\n", tz->forced_passive);
281 }
282
283 static DEVICE_ATTR(type, 0444, type_show, NULL);
284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
287                    passive_store);
288
289 static struct device_attribute trip_point_attrs[] = {
290         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
291         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
292         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
293         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
294         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
295         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
296         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
297         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
298         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
299         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
300         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
301         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
302         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
303         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
304         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
305         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
306         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
307         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
308         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
309         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
310         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
311         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
312         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
313         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
314 };
315
316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
317 do {    \
318         result = device_create_file(_dev,       \
319                                 &trip_point_attrs[_index * 2]); \
320         if (result)     \
321                 break;  \
322         result = device_create_file(_dev,       \
323                         &trip_point_attrs[_index * 2 + 1]);     \
324 } while (0)
325
326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
327 do {    \
328         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
329         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
330 } while (0)
331
332 /* sys I/F for cooling device */
333 #define to_cooling_device(_dev) \
334         container_of(_dev, struct thermal_cooling_device, device)
335
336 static ssize_t
337 thermal_cooling_device_type_show(struct device *dev,
338                                  struct device_attribute *attr, char *buf)
339 {
340         struct thermal_cooling_device *cdev = to_cooling_device(dev);
341
342         return sprintf(buf, "%s\n", cdev->type);
343 }
344
345 static ssize_t
346 thermal_cooling_device_max_state_show(struct device *dev,
347                                       struct device_attribute *attr, char *buf)
348 {
349         struct thermal_cooling_device *cdev = to_cooling_device(dev);
350         unsigned long state;
351         int ret;
352
353         ret = cdev->ops->get_max_state(cdev, &state);
354         if (ret)
355                 return ret;
356         return sprintf(buf, "%ld\n", state);
357 }
358
359 static ssize_t
360 thermal_cooling_device_cur_state_show(struct device *dev,
361                                       struct device_attribute *attr, char *buf)
362 {
363         struct thermal_cooling_device *cdev = to_cooling_device(dev);
364         unsigned long state;
365         int ret;
366
367         ret = cdev->ops->get_cur_state(cdev, &state);
368         if (ret)
369                 return ret;
370         return sprintf(buf, "%ld\n", state);
371 }
372
373 static ssize_t
374 thermal_cooling_device_cur_state_store(struct device *dev,
375                                        struct device_attribute *attr,
376                                        const char *buf, size_t count)
377 {
378         struct thermal_cooling_device *cdev = to_cooling_device(dev);
379         unsigned long state;
380         int result;
381
382         if (!sscanf(buf, "%ld\n", &state))
383                 return -EINVAL;
384
385         if ((long)state < 0)
386                 return -EINVAL;
387
388         result = cdev->ops->set_cur_state(cdev, state);
389         if (result)
390                 return result;
391         return count;
392 }
393
394 static struct device_attribute dev_attr_cdev_type =
395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
396 static DEVICE_ATTR(max_state, 0444,
397                    thermal_cooling_device_max_state_show, NULL);
398 static DEVICE_ATTR(cur_state, 0644,
399                    thermal_cooling_device_cur_state_show,
400                    thermal_cooling_device_cur_state_store);
401
402 static ssize_t
403 thermal_cooling_device_trip_point_show(struct device *dev,
404                                        struct device_attribute *attr, char *buf)
405 {
406         struct thermal_cooling_device_instance *instance;
407
408         instance =
409             container_of(attr, struct thermal_cooling_device_instance, attr);
410
411         if (instance->trip == THERMAL_TRIPS_NONE)
412                 return sprintf(buf, "-1\n");
413         else
414                 return sprintf(buf, "%d\n", instance->trip);
415 }
416
417 /* Device management */
418
419 #if defined(CONFIG_THERMAL_HWMON)
420
421 /* hwmon sys I/F */
422 #include <linux/hwmon.h>
423
424 /* thermal zone devices with the same type share one hwmon device */
425 struct thermal_hwmon_device {
426         char type[THERMAL_NAME_LENGTH];
427         struct device *device;
428         int count;
429         struct list_head tz_list;
430         struct list_head node;
431 };
432
433 struct thermal_hwmon_attr {
434         struct device_attribute attr;
435         char name[16];
436 };
437
438 /* one temperature input for each thermal zone */
439 struct thermal_hwmon_temp {
440         struct list_head hwmon_node;
441         struct thermal_zone_device *tz;
442         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
443         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
444 };
445
446 static LIST_HEAD(thermal_hwmon_list);
447
448 static ssize_t
449 name_show(struct device *dev, struct device_attribute *attr, char *buf)
450 {
451         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
452         return sprintf(buf, "%s\n", hwmon->type);
453 }
454 static DEVICE_ATTR(name, 0444, name_show, NULL);
455
456 static ssize_t
457 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
458 {
459         long temperature;
460         int ret;
461         struct thermal_hwmon_attr *hwmon_attr
462                         = container_of(attr, struct thermal_hwmon_attr, attr);
463         struct thermal_hwmon_temp *temp
464                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
465                                        temp_input);
466         struct thermal_zone_device *tz = temp->tz;
467
468         ret = tz->ops->get_temp(tz, &temperature);
469
470         if (ret)
471                 return ret;
472
473         return sprintf(buf, "%ld\n", temperature);
474 }
475
476 static ssize_t
477 temp_crit_show(struct device *dev, struct device_attribute *attr,
478                 char *buf)
479 {
480         struct thermal_hwmon_attr *hwmon_attr
481                         = container_of(attr, struct thermal_hwmon_attr, attr);
482         struct thermal_hwmon_temp *temp
483                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
484                                        temp_crit);
485         struct thermal_zone_device *tz = temp->tz;
486         long temperature;
487         int ret;
488
489         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
490         if (ret)
491                 return ret;
492
493         return sprintf(buf, "%ld\n", temperature);
494 }
495
496
497 static struct thermal_hwmon_device *
498 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
499 {
500         struct thermal_hwmon_device *hwmon;
501
502         mutex_lock(&thermal_list_lock);
503         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
504                 if (!strcmp(hwmon->type, tz->type)) {
505                         mutex_unlock(&thermal_list_lock);
506                         return hwmon;
507                 }
508         mutex_unlock(&thermal_list_lock);
509
510         return NULL;
511 }
512
513 /* Find the temperature input matching a given thermal zone */
514 static struct thermal_hwmon_temp *
515 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
516                           const struct thermal_zone_device *tz)
517 {
518         struct thermal_hwmon_temp *temp;
519
520         mutex_lock(&thermal_list_lock);
521         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
522                 if (temp->tz == tz) {
523                         mutex_unlock(&thermal_list_lock);
524                         return temp;
525                 }
526         mutex_unlock(&thermal_list_lock);
527
528         return NULL;
529 }
530
531 static int
532 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
533 {
534         struct thermal_hwmon_device *hwmon;
535         struct thermal_hwmon_temp *temp;
536         int new_hwmon_device = 1;
537         int result;
538
539         hwmon = thermal_hwmon_lookup_by_type(tz);
540         if (hwmon) {
541                 new_hwmon_device = 0;
542                 goto register_sys_interface;
543         }
544
545         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
546         if (!hwmon)
547                 return -ENOMEM;
548
549         INIT_LIST_HEAD(&hwmon->tz_list);
550         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
551         hwmon->device = hwmon_device_register(NULL);
552         if (IS_ERR(hwmon->device)) {
553                 result = PTR_ERR(hwmon->device);
554                 goto free_mem;
555         }
556         dev_set_drvdata(hwmon->device, hwmon);
557         result = device_create_file(hwmon->device, &dev_attr_name);
558         if (result)
559                 goto free_mem;
560
561  register_sys_interface:
562         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
563         if (!temp) {
564                 result = -ENOMEM;
565                 goto unregister_name;
566         }
567
568         temp->tz = tz;
569         hwmon->count++;
570
571         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
572                  "temp%d_input", hwmon->count);
573         temp->temp_input.attr.attr.name = temp->temp_input.name;
574         temp->temp_input.attr.attr.mode = 0444;
575         temp->temp_input.attr.show = temp_input_show;
576         sysfs_attr_init(&temp->temp_input.attr.attr);
577         result = device_create_file(hwmon->device, &temp->temp_input.attr);
578         if (result)
579                 goto free_temp_mem;
580
581         if (tz->ops->get_crit_temp) {
582                 unsigned long temperature;
583                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
584                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
585                                 "temp%d_crit", hwmon->count);
586                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
587                         temp->temp_crit.attr.attr.mode = 0444;
588                         temp->temp_crit.attr.show = temp_crit_show;
589                         sysfs_attr_init(&temp->temp_crit.attr.attr);
590                         result = device_create_file(hwmon->device,
591                                                     &temp->temp_crit.attr);
592                         if (result)
593                                 goto unregister_input;
594                 }
595         }
596
597         mutex_lock(&thermal_list_lock);
598         if (new_hwmon_device)
599                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
600         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
601         mutex_unlock(&thermal_list_lock);
602
603         return 0;
604
605  unregister_input:
606         device_remove_file(hwmon->device, &temp->temp_input.attr);
607  free_temp_mem:
608         kfree(temp);
609  unregister_name:
610         if (new_hwmon_device) {
611                 device_remove_file(hwmon->device, &dev_attr_name);
612                 hwmon_device_unregister(hwmon->device);
613         }
614  free_mem:
615         if (new_hwmon_device)
616                 kfree(hwmon);
617
618         return result;
619 }
620
621 static void
622 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
623 {
624         struct thermal_hwmon_device *hwmon;
625         struct thermal_hwmon_temp *temp;
626
627         hwmon = thermal_hwmon_lookup_by_type(tz);
628         if (unlikely(!hwmon)) {
629                 /* Should never happen... */
630                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
631                 return;
632         }
633
634         temp = thermal_hwmon_lookup_temp(hwmon, tz);
635         if (unlikely(!temp)) {
636                 /* Should never happen... */
637                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
638                 return;
639         }
640
641         device_remove_file(hwmon->device, &temp->temp_input.attr);
642         if (tz->ops->get_crit_temp)
643                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
644
645         mutex_lock(&thermal_list_lock);
646         list_del(&temp->hwmon_node);
647         kfree(temp);
648         if (!list_empty(&hwmon->tz_list)) {
649                 mutex_unlock(&thermal_list_lock);
650                 return;
651         }
652         list_del(&hwmon->node);
653         mutex_unlock(&thermal_list_lock);
654
655         device_remove_file(hwmon->device, &dev_attr_name);
656         hwmon_device_unregister(hwmon->device);
657         kfree(hwmon);
658 }
659 #else
660 static int
661 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
662 {
663         return 0;
664 }
665
666 static void
667 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
668 {
669 }
670 #endif
671
672 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
673                                             int delay)
674 {
675         cancel_delayed_work(&(tz->poll_queue));
676
677         if (!delay)
678                 return;
679
680         if (delay > 1000)
681                 schedule_delayed_work(&(tz->poll_queue),
682                                       round_jiffies(msecs_to_jiffies(delay)));
683         else
684                 schedule_delayed_work(&(tz->poll_queue),
685                                       msecs_to_jiffies(delay));
686 }
687
688 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
689                                         int temp, int trip_temp, int trip)
690 {
691         int trend = 0;
692         struct thermal_cooling_device_instance *instance;
693         struct thermal_cooling_device *cdev;
694         long state, max_state;
695
696         /*
697          * Above Trip?
698          * -----------
699          * Calculate the thermal trend (using the passive cooling equation)
700          * and modify the performance limit for all passive cooling devices
701          * accordingly.  Note that we assume symmetry.
702          */
703         if (temp >= trip_temp) {
704                 tz->passive = true;
705
706                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
707                         (tz->tc2 * (temp - trip_temp));
708
709                 /* Heating up? */
710                 if (trend > 0) {
711                         list_for_each_entry(instance, &tz->cooling_devices,
712                                             node) {
713                                 if (instance->trip != trip)
714                                         continue;
715                                 cdev = instance->cdev;
716                                 cdev->ops->get_cur_state(cdev, &state);
717                                 cdev->ops->get_max_state(cdev, &max_state);
718                                 if (state++ < max_state)
719                                         cdev->ops->set_cur_state(cdev, state);
720                         }
721                 } else if (trend < 0) { /* Cooling off? */
722                         list_for_each_entry(instance, &tz->cooling_devices,
723                                             node) {
724                                 if (instance->trip != trip)
725                                         continue;
726                                 cdev = instance->cdev;
727                                 cdev->ops->get_cur_state(cdev, &state);
728                                 cdev->ops->get_max_state(cdev, &max_state);
729                                 if (state > 0)
730                                         cdev->ops->set_cur_state(cdev, --state);
731                         }
732                 }
733                 return;
734         }
735
736         /*
737          * Below Trip?
738          * -----------
739          * Implement passive cooling hysteresis to slowly increase performance
740          * and avoid thrashing around the passive trip point.  Note that we
741          * assume symmetry.
742          */
743         list_for_each_entry(instance, &tz->cooling_devices, node) {
744                 if (instance->trip != trip)
745                         continue;
746                 cdev = instance->cdev;
747                 cdev->ops->get_cur_state(cdev, &state);
748                 cdev->ops->get_max_state(cdev, &max_state);
749                 if (state > 0)
750                         cdev->ops->set_cur_state(cdev, --state);
751                 if (state == 0)
752                         tz->passive = false;
753         }
754 }
755
756 static void thermal_zone_device_check(struct work_struct *work)
757 {
758         struct thermal_zone_device *tz = container_of(work, struct
759                                                       thermal_zone_device,
760                                                       poll_queue.work);
761         thermal_zone_device_update(tz);
762 }
763
764 /**
765  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
766  * @tz:         thermal zone device
767  * @trip:       indicates which trip point the cooling devices is
768  *              associated with in this thermal zone.
769  * @cdev:       thermal cooling device
770  *
771  * This function is usually called in the thermal zone device .bind callback.
772  */
773 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
774                                      int trip,
775                                      struct thermal_cooling_device *cdev)
776 {
777         struct thermal_cooling_device_instance *dev;
778         struct thermal_cooling_device_instance *pos;
779         struct thermal_zone_device *pos1;
780         struct thermal_cooling_device *pos2;
781         int result;
782
783         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
784                 return -EINVAL;
785
786         list_for_each_entry(pos1, &thermal_tz_list, node) {
787                 if (pos1 == tz)
788                         break;
789         }
790         list_for_each_entry(pos2, &thermal_cdev_list, node) {
791                 if (pos2 == cdev)
792                         break;
793         }
794
795         if (tz != pos1 || cdev != pos2)
796                 return -EINVAL;
797
798         dev =
799             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
800         if (!dev)
801                 return -ENOMEM;
802         dev->tz = tz;
803         dev->cdev = cdev;
804         dev->trip = trip;
805         result = get_idr(&tz->idr, &tz->lock, &dev->id);
806         if (result)
807                 goto free_mem;
808
809         sprintf(dev->name, "cdev%d", dev->id);
810         result =
811             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
812         if (result)
813                 goto release_idr;
814
815         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
816         sysfs_attr_init(&dev->attr.attr);
817         dev->attr.attr.name = dev->attr_name;
818         dev->attr.attr.mode = 0444;
819         dev->attr.show = thermal_cooling_device_trip_point_show;
820         result = device_create_file(&tz->device, &dev->attr);
821         if (result)
822                 goto remove_symbol_link;
823
824         mutex_lock(&tz->lock);
825         list_for_each_entry(pos, &tz->cooling_devices, node)
826             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
827                 result = -EEXIST;
828                 break;
829         }
830         if (!result)
831                 list_add_tail(&dev->node, &tz->cooling_devices);
832         mutex_unlock(&tz->lock);
833
834         if (!result)
835                 return 0;
836
837         device_remove_file(&tz->device, &dev->attr);
838       remove_symbol_link:
839         sysfs_remove_link(&tz->device.kobj, dev->name);
840       release_idr:
841         release_idr(&tz->idr, &tz->lock, dev->id);
842       free_mem:
843         kfree(dev);
844         return result;
845 }
846
847 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
848
849 /**
850  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
851  * @tz:         thermal zone device
852  * @trip:       indicates which trip point the cooling devices is
853  *              associated with in this thermal zone.
854  * @cdev:       thermal cooling device
855  *
856  * This function is usually called in the thermal zone device .unbind callback.
857  */
858 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
859                                        int trip,
860                                        struct thermal_cooling_device *cdev)
861 {
862         struct thermal_cooling_device_instance *pos, *next;
863
864         mutex_lock(&tz->lock);
865         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
866                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
867                         list_del(&pos->node);
868                         mutex_unlock(&tz->lock);
869                         goto unbind;
870                 }
871         }
872         mutex_unlock(&tz->lock);
873
874         return -ENODEV;
875
876       unbind:
877         device_remove_file(&tz->device, &pos->attr);
878         sysfs_remove_link(&tz->device.kobj, pos->name);
879         release_idr(&tz->idr, &tz->lock, pos->id);
880         kfree(pos);
881         return 0;
882 }
883
884 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
885
886 static void thermal_release(struct device *dev)
887 {
888         struct thermal_zone_device *tz;
889         struct thermal_cooling_device *cdev;
890
891         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
892                 tz = to_thermal_zone(dev);
893                 kfree(tz);
894         } else {
895                 cdev = to_cooling_device(dev);
896                 kfree(cdev);
897         }
898 }
899
900 static struct class thermal_class = {
901         .name = "thermal",
902         .dev_release = thermal_release,
903 };
904
905 /**
906  * thermal_cooling_device_register - register a new thermal cooling device
907  * @type:       the thermal cooling device type.
908  * @devdata:    device private data.
909  * @ops:                standard thermal cooling devices callbacks.
910  */
911 struct thermal_cooling_device *thermal_cooling_device_register(
912      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
913 {
914         struct thermal_cooling_device *cdev;
915         struct thermal_zone_device *pos;
916         int result;
917
918         if (strlen(type) >= THERMAL_NAME_LENGTH)
919                 return ERR_PTR(-EINVAL);
920
921         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
922             !ops->set_cur_state)
923                 return ERR_PTR(-EINVAL);
924
925         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
926         if (!cdev)
927                 return ERR_PTR(-ENOMEM);
928
929         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
930         if (result) {
931                 kfree(cdev);
932                 return ERR_PTR(result);
933         }
934
935         strcpy(cdev->type, type);
936         cdev->ops = ops;
937         cdev->device.class = &thermal_class;
938         cdev->devdata = devdata;
939         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
940         result = device_register(&cdev->device);
941         if (result) {
942                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
943                 kfree(cdev);
944                 return ERR_PTR(result);
945         }
946
947         /* sys I/F */
948         if (type) {
949                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
950                 if (result)
951                         goto unregister;
952         }
953
954         result = device_create_file(&cdev->device, &dev_attr_max_state);
955         if (result)
956                 goto unregister;
957
958         result = device_create_file(&cdev->device, &dev_attr_cur_state);
959         if (result)
960                 goto unregister;
961
962         mutex_lock(&thermal_list_lock);
963         list_add(&cdev->node, &thermal_cdev_list);
964         list_for_each_entry(pos, &thermal_tz_list, node) {
965                 if (!pos->ops->bind)
966                         continue;
967                 result = pos->ops->bind(pos, cdev);
968                 if (result)
969                         break;
970
971         }
972         mutex_unlock(&thermal_list_lock);
973
974         if (!result)
975                 return cdev;
976
977       unregister:
978         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
979         device_unregister(&cdev->device);
980         return ERR_PTR(result);
981 }
982
983 EXPORT_SYMBOL(thermal_cooling_device_register);
984
985 /**
986  * thermal_cooling_device_unregister - removes the registered thermal cooling device
987  * @cdev:       the thermal cooling device to remove.
988  *
989  * thermal_cooling_device_unregister() must be called when the device is no
990  * longer needed.
991  */
992 void thermal_cooling_device_unregister(struct
993                                        thermal_cooling_device
994                                        *cdev)
995 {
996         struct thermal_zone_device *tz;
997         struct thermal_cooling_device *pos = NULL;
998
999         if (!cdev)
1000                 return;
1001
1002         mutex_lock(&thermal_list_lock);
1003         list_for_each_entry(pos, &thermal_cdev_list, node)
1004             if (pos == cdev)
1005                 break;
1006         if (pos != cdev) {
1007                 /* thermal cooling device not found */
1008                 mutex_unlock(&thermal_list_lock);
1009                 return;
1010         }
1011         list_del(&cdev->node);
1012         list_for_each_entry(tz, &thermal_tz_list, node) {
1013                 if (!tz->ops->unbind)
1014                         continue;
1015                 tz->ops->unbind(tz, cdev);
1016         }
1017         mutex_unlock(&thermal_list_lock);
1018         if (cdev->type[0])
1019                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1020         device_remove_file(&cdev->device, &dev_attr_max_state);
1021         device_remove_file(&cdev->device, &dev_attr_cur_state);
1022
1023         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1024         device_unregister(&cdev->device);
1025         return;
1026 }
1027
1028 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1029
1030 /**
1031  * thermal_zone_device_update - force an update of a thermal zone's state
1032  * @ttz:        the thermal zone to update
1033  */
1034
1035 void thermal_zone_device_update(struct thermal_zone_device *tz)
1036 {
1037         int count, ret = 0;
1038         long temp, trip_temp;
1039         enum thermal_trip_type trip_type;
1040         struct thermal_cooling_device_instance *instance;
1041         struct thermal_cooling_device *cdev;
1042
1043         mutex_lock(&tz->lock);
1044
1045         if (tz->ops->get_temp(tz, &temp)) {
1046                 /* get_temp failed - retry it later */
1047                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
1048                        "%d\n", tz->id);
1049                 goto leave;
1050         }
1051
1052         for (count = 0; count < tz->trips; count++) {
1053                 tz->ops->get_trip_type(tz, count, &trip_type);
1054                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1055
1056                 switch (trip_type) {
1057                 case THERMAL_TRIP_CRITICAL:
1058                         if (temp >= trip_temp) {
1059                                 if (tz->ops->notify)
1060                                         ret = tz->ops->notify(tz, count,
1061                                                               trip_type);
1062                                 if (!ret) {
1063                                         printk(KERN_EMERG
1064                                                "Critical temperature reached (%ld C), shutting down.\n",
1065                                                temp/1000);
1066                                         orderly_poweroff(true);
1067                                 }
1068                         }
1069                         break;
1070                 case THERMAL_TRIP_HOT:
1071                         if (temp >= trip_temp)
1072                                 if (tz->ops->notify)
1073                                         tz->ops->notify(tz, count, trip_type);
1074                         break;
1075                 case THERMAL_TRIP_ACTIVE:
1076                         list_for_each_entry(instance, &tz->cooling_devices,
1077                                             node) {
1078                                 if (instance->trip != count)
1079                                         continue;
1080
1081                                 cdev = instance->cdev;
1082
1083                                 if (temp >= trip_temp)
1084                                         cdev->ops->set_cur_state(cdev, 1);
1085                                 else
1086                                         cdev->ops->set_cur_state(cdev, 0);
1087                         }
1088                         break;
1089                 case THERMAL_TRIP_PASSIVE:
1090                         if (temp >= trip_temp || tz->passive)
1091                                 thermal_zone_device_passive(tz, temp,
1092                                                             trip_temp, count);
1093                         break;
1094                 }
1095         }
1096
1097         if (tz->forced_passive)
1098                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1099                                             THERMAL_TRIPS_NONE);
1100
1101         tz->last_temperature = temp;
1102
1103       leave:
1104         if (tz->passive)
1105                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1106         else if (tz->polling_delay)
1107                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1108         else
1109                 thermal_zone_device_set_polling(tz, 0);
1110         mutex_unlock(&tz->lock);
1111 }
1112 EXPORT_SYMBOL(thermal_zone_device_update);
1113
1114 /**
1115  * thermal_zone_device_register - register a new thermal zone device
1116  * @type:       the thermal zone device type
1117  * @trips:      the number of trip points the thermal zone support
1118  * @devdata:    private device data
1119  * @ops:        standard thermal zone device callbacks
1120  * @tc1:        thermal coefficient 1 for passive calculations
1121  * @tc2:        thermal coefficient 2 for passive calculations
1122  * @passive_delay: number of milliseconds to wait between polls when
1123  *                 performing passive cooling
1124  * @polling_delay: number of milliseconds to wait between polls when checking
1125  *                 whether trip points have been crossed (0 for interrupt
1126  *                 driven systems)
1127  *
1128  * thermal_zone_device_unregister() must be called when the device is no
1129  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1130  * section 11.1.5.1 of the ACPI specification 3.0.
1131  */
1132 struct thermal_zone_device *thermal_zone_device_register(char *type,
1133         int trips, void *devdata,
1134         const struct thermal_zone_device_ops *ops,
1135         int tc1, int tc2, int passive_delay, int polling_delay)
1136 {
1137         struct thermal_zone_device *tz;
1138         struct thermal_cooling_device *pos;
1139         enum thermal_trip_type trip_type;
1140         int result;
1141         int count;
1142         int passive = 0;
1143
1144         if (strlen(type) >= THERMAL_NAME_LENGTH)
1145                 return ERR_PTR(-EINVAL);
1146
1147         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1148                 return ERR_PTR(-EINVAL);
1149
1150         if (!ops || !ops->get_temp)
1151                 return ERR_PTR(-EINVAL);
1152
1153         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1154         if (!tz)
1155                 return ERR_PTR(-ENOMEM);
1156
1157         INIT_LIST_HEAD(&tz->cooling_devices);
1158         idr_init(&tz->idr);
1159         mutex_init(&tz->lock);
1160         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1161         if (result) {
1162                 kfree(tz);
1163                 return ERR_PTR(result);
1164         }
1165
1166         strcpy(tz->type, type);
1167         tz->ops = ops;
1168         tz->device.class = &thermal_class;
1169         tz->devdata = devdata;
1170         tz->trips = trips;
1171         tz->tc1 = tc1;
1172         tz->tc2 = tc2;
1173         tz->passive_delay = passive_delay;
1174         tz->polling_delay = polling_delay;
1175
1176         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1177         result = device_register(&tz->device);
1178         if (result) {
1179                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1180                 kfree(tz);
1181                 return ERR_PTR(result);
1182         }
1183
1184         /* sys I/F */
1185         if (type) {
1186                 result = device_create_file(&tz->device, &dev_attr_type);
1187                 if (result)
1188                         goto unregister;
1189         }
1190
1191         result = device_create_file(&tz->device, &dev_attr_temp);
1192         if (result)
1193                 goto unregister;
1194
1195         if (ops->get_mode) {
1196                 result = device_create_file(&tz->device, &dev_attr_mode);
1197                 if (result)
1198                         goto unregister;
1199         }
1200
1201         for (count = 0; count < trips; count++) {
1202                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1203                 if (result)
1204                         goto unregister;
1205                 tz->ops->get_trip_type(tz, count, &trip_type);
1206                 if (trip_type == THERMAL_TRIP_PASSIVE)
1207                         passive = 1;
1208         }
1209
1210         if (!passive)
1211                 result = device_create_file(&tz->device,
1212                                             &dev_attr_passive);
1213
1214         if (result)
1215                 goto unregister;
1216
1217         result = thermal_add_hwmon_sysfs(tz);
1218         if (result)
1219                 goto unregister;
1220
1221         mutex_lock(&thermal_list_lock);
1222         list_add_tail(&tz->node, &thermal_tz_list);
1223         if (ops->bind)
1224                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1225                 result = ops->bind(tz, pos);
1226                 if (result)
1227                         break;
1228                 }
1229         mutex_unlock(&thermal_list_lock);
1230
1231         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1232
1233         thermal_zone_device_update(tz);
1234
1235         if (!result)
1236                 return tz;
1237
1238       unregister:
1239         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1240         device_unregister(&tz->device);
1241         return ERR_PTR(result);
1242 }
1243
1244 EXPORT_SYMBOL(thermal_zone_device_register);
1245
1246 /**
1247  * thermal_device_unregister - removes the registered thermal zone device
1248  * @tz: the thermal zone device to remove
1249  */
1250 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1251 {
1252         struct thermal_cooling_device *cdev;
1253         struct thermal_zone_device *pos = NULL;
1254         int count;
1255
1256         if (!tz)
1257                 return;
1258
1259         mutex_lock(&thermal_list_lock);
1260         list_for_each_entry(pos, &thermal_tz_list, node)
1261             if (pos == tz)
1262                 break;
1263         if (pos != tz) {
1264                 /* thermal zone device not found */
1265                 mutex_unlock(&thermal_list_lock);
1266                 return;
1267         }
1268         list_del(&tz->node);
1269         if (tz->ops->unbind)
1270                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1271                     tz->ops->unbind(tz, cdev);
1272         mutex_unlock(&thermal_list_lock);
1273
1274         thermal_zone_device_set_polling(tz, 0);
1275
1276         if (tz->type[0])
1277                 device_remove_file(&tz->device, &dev_attr_type);
1278         device_remove_file(&tz->device, &dev_attr_temp);
1279         if (tz->ops->get_mode)
1280                 device_remove_file(&tz->device, &dev_attr_mode);
1281
1282         for (count = 0; count < tz->trips; count++)
1283                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1284
1285         thermal_remove_hwmon_sysfs(tz);
1286         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1287         idr_destroy(&tz->idr);
1288         mutex_destroy(&tz->lock);
1289         device_unregister(&tz->device);
1290         return;
1291 }
1292
1293 EXPORT_SYMBOL(thermal_zone_device_unregister);
1294
1295 #ifdef CONFIG_NET
1296 static struct genl_family thermal_event_genl_family = {
1297         .id = GENL_ID_GENERATE,
1298         .name = THERMAL_GENL_FAMILY_NAME,
1299         .version = THERMAL_GENL_VERSION,
1300         .maxattr = THERMAL_GENL_ATTR_MAX,
1301 };
1302
1303 static struct genl_multicast_group thermal_event_mcgrp = {
1304         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1305 };
1306
1307 int generate_netlink_event(u32 orig, enum events event)
1308 {
1309         struct sk_buff *skb;
1310         struct nlattr *attr;
1311         struct thermal_genl_event *thermal_event;
1312         void *msg_header;
1313         int size;
1314         int result;
1315
1316         /* allocate memory */
1317         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1318                                 nla_total_size(0);
1319
1320         skb = genlmsg_new(size, GFP_ATOMIC);
1321         if (!skb)
1322                 return -ENOMEM;
1323
1324         /* add the genetlink message header */
1325         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1326                                  &thermal_event_genl_family, 0,
1327                                  THERMAL_GENL_CMD_EVENT);
1328         if (!msg_header) {
1329                 nlmsg_free(skb);
1330                 return -ENOMEM;
1331         }
1332
1333         /* fill the data */
1334         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1335                         sizeof(struct thermal_genl_event));
1336
1337         if (!attr) {
1338                 nlmsg_free(skb);
1339                 return -EINVAL;
1340         }
1341
1342         thermal_event = nla_data(attr);
1343         if (!thermal_event) {
1344                 nlmsg_free(skb);
1345                 return -EINVAL;
1346         }
1347
1348         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1349
1350         thermal_event->orig = orig;
1351         thermal_event->event = event;
1352
1353         /* send multicast genetlink message */
1354         result = genlmsg_end(skb, msg_header);
1355         if (result < 0) {
1356                 nlmsg_free(skb);
1357                 return result;
1358         }
1359
1360         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1361         if (result)
1362                 printk(KERN_INFO "failed to send netlink event:%d", result);
1363
1364         return result;
1365 }
1366 EXPORT_SYMBOL(generate_netlink_event);
1367
1368 static int genetlink_init(void)
1369 {
1370         int result;
1371
1372         result = genl_register_family(&thermal_event_genl_family);
1373         if (result)
1374                 return result;
1375
1376         result = genl_register_mc_group(&thermal_event_genl_family,
1377                                         &thermal_event_mcgrp);
1378         if (result)
1379                 genl_unregister_family(&thermal_event_genl_family);
1380         return result;
1381 }
1382
1383 static void genetlink_exit(void)
1384 {
1385         genl_unregister_family(&thermal_event_genl_family);
1386 }
1387 #else /* !CONFIG_NET */
1388 static inline int genetlink_init(void) { return 0; }
1389 static inline void genetlink_exit(void) {}
1390 #endif /* !CONFIG_NET */
1391
1392 static int __init thermal_init(void)
1393 {
1394         int result = 0;
1395
1396         result = class_register(&thermal_class);
1397         if (result) {
1398                 idr_destroy(&thermal_tz_idr);
1399                 idr_destroy(&thermal_cdev_idr);
1400                 mutex_destroy(&thermal_idr_lock);
1401                 mutex_destroy(&thermal_list_lock);
1402         }
1403         result = genetlink_init();
1404         return result;
1405 }
1406
1407 static void __exit thermal_exit(void)
1408 {
1409         class_unregister(&thermal_class);
1410         idr_destroy(&thermal_tz_idr);
1411         idr_destroy(&thermal_cdev_idr);
1412         mutex_destroy(&thermal_idr_lock);
1413         mutex_destroy(&thermal_list_lock);
1414         genetlink_exit();
1415 }
1416
1417 fs_initcall(thermal_init);
1418 module_exit(thermal_exit);