07b1add0930e38a1f5cad2fed1d388260a3145dd
[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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/slab.h>
32 #include <linux/kdev_t.h>
33 #include <linux/idr.h>
34 #include <linux/thermal.h>
35 #include <linux/spinlock.h>
36 #include <linux/reboot.h>
37 #include <net/netlink.h>
38 #include <net/genetlink.h>
39
40 MODULE_AUTHOR("Zhang Rui");
41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
42 MODULE_LICENSE("GPL");
43
44 /*
45  * This structure is used to describe the behavior of
46  * a certain cooling device on a certain trip point
47  * in a certain thermal zone
48  */
49 struct thermal_cooling_device_instance {
50         int id;
51         char name[THERMAL_NAME_LENGTH];
52         struct thermal_zone_device *tz;
53         struct thermal_cooling_device *cdev;
54         int trip;
55         unsigned long upper;    /* Highest cooling state for this trip point */
56         unsigned long lower;    /* Lowest cooling state for this trip point */
57         char attr_name[THERMAL_NAME_LENGTH];
58         struct device_attribute attr;
59         struct list_head node;
60 };
61
62 static DEFINE_IDR(thermal_tz_idr);
63 static DEFINE_IDR(thermal_cdev_idr);
64 static DEFINE_MUTEX(thermal_idr_lock);
65
66 static LIST_HEAD(thermal_tz_list);
67 static LIST_HEAD(thermal_cdev_list);
68 static DEFINE_MUTEX(thermal_list_lock);
69
70 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
71 {
72         int err;
73
74 again:
75         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
76                 return -ENOMEM;
77
78         if (lock)
79                 mutex_lock(lock);
80         err = idr_get_new(idr, NULL, id);
81         if (lock)
82                 mutex_unlock(lock);
83         if (unlikely(err == -EAGAIN))
84                 goto again;
85         else if (unlikely(err))
86                 return err;
87
88         *id = *id & MAX_ID_MASK;
89         return 0;
90 }
91
92 static void release_idr(struct idr *idr, struct mutex *lock, int id)
93 {
94         if (lock)
95                 mutex_lock(lock);
96         idr_remove(idr, id);
97         if (lock)
98                 mutex_unlock(lock);
99 }
100
101 /* sys I/F for thermal zone */
102
103 #define to_thermal_zone(_dev) \
104         container_of(_dev, struct thermal_zone_device, device)
105
106 static ssize_t
107 type_show(struct device *dev, struct device_attribute *attr, char *buf)
108 {
109         struct thermal_zone_device *tz = to_thermal_zone(dev);
110
111         return sprintf(buf, "%s\n", tz->type);
112 }
113
114 static ssize_t
115 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
116 {
117         struct thermal_zone_device *tz = to_thermal_zone(dev);
118         long temperature;
119         int ret;
120
121         if (!tz->ops->get_temp)
122                 return -EPERM;
123
124         ret = tz->ops->get_temp(tz, &temperature);
125
126         if (ret)
127                 return ret;
128
129         return sprintf(buf, "%ld\n", temperature);
130 }
131
132 static ssize_t
133 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
134 {
135         struct thermal_zone_device *tz = to_thermal_zone(dev);
136         enum thermal_device_mode mode;
137         int result;
138
139         if (!tz->ops->get_mode)
140                 return -EPERM;
141
142         result = tz->ops->get_mode(tz, &mode);
143         if (result)
144                 return result;
145
146         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
147                        : "disabled");
148 }
149
150 static ssize_t
151 mode_store(struct device *dev, struct device_attribute *attr,
152            const char *buf, size_t count)
153 {
154         struct thermal_zone_device *tz = to_thermal_zone(dev);
155         int result;
156
157         if (!tz->ops->set_mode)
158                 return -EPERM;
159
160         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
161                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
162         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
163                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
164         else
165                 result = -EINVAL;
166
167         if (result)
168                 return result;
169
170         return count;
171 }
172
173 static ssize_t
174 trip_point_type_show(struct device *dev, struct device_attribute *attr,
175                      char *buf)
176 {
177         struct thermal_zone_device *tz = to_thermal_zone(dev);
178         enum thermal_trip_type type;
179         int trip, result;
180
181         if (!tz->ops->get_trip_type)
182                 return -EPERM;
183
184         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
185                 return -EINVAL;
186
187         result = tz->ops->get_trip_type(tz, trip, &type);
188         if (result)
189                 return result;
190
191         switch (type) {
192         case THERMAL_TRIP_CRITICAL:
193                 return sprintf(buf, "critical\n");
194         case THERMAL_TRIP_HOT:
195                 return sprintf(buf, "hot\n");
196         case THERMAL_TRIP_PASSIVE:
197                 return sprintf(buf, "passive\n");
198         case THERMAL_TRIP_ACTIVE:
199                 return sprintf(buf, "active\n");
200         default:
201                 return sprintf(buf, "unknown\n");
202         }
203 }
204
205 static ssize_t
206 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
207                      const char *buf, size_t count)
208 {
209         struct thermal_zone_device *tz = to_thermal_zone(dev);
210         int trip, ret;
211         unsigned long temperature;
212
213         if (!tz->ops->set_trip_temp)
214                 return -EPERM;
215
216         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
217                 return -EINVAL;
218
219         if (kstrtoul(buf, 10, &temperature))
220                 return -EINVAL;
221
222         ret = tz->ops->set_trip_temp(tz, trip, temperature);
223
224         return ret ? ret : count;
225 }
226
227 static ssize_t
228 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
229                      char *buf)
230 {
231         struct thermal_zone_device *tz = to_thermal_zone(dev);
232         int trip, ret;
233         long temperature;
234
235         if (!tz->ops->get_trip_temp)
236                 return -EPERM;
237
238         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
239                 return -EINVAL;
240
241         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
242
243         if (ret)
244                 return ret;
245
246         return sprintf(buf, "%ld\n", temperature);
247 }
248
249 static ssize_t
250 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
251                         const char *buf, size_t count)
252 {
253         struct thermal_zone_device *tz = to_thermal_zone(dev);
254         int trip, ret;
255         unsigned long temperature;
256
257         if (!tz->ops->set_trip_hyst)
258                 return -EPERM;
259
260         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
261                 return -EINVAL;
262
263         if (kstrtoul(buf, 10, &temperature))
264                 return -EINVAL;
265
266         /*
267          * We are not doing any check on the 'temperature' value
268          * here. The driver implementing 'set_trip_hyst' has to
269          * take care of this.
270          */
271         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
272
273         return ret ? ret : count;
274 }
275
276 static ssize_t
277 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
278                         char *buf)
279 {
280         struct thermal_zone_device *tz = to_thermal_zone(dev);
281         int trip, ret;
282         unsigned long temperature;
283
284         if (!tz->ops->get_trip_hyst)
285                 return -EPERM;
286
287         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
288                 return -EINVAL;
289
290         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
291
292         return ret ? ret : sprintf(buf, "%ld\n", temperature);
293 }
294
295 static ssize_t
296 passive_store(struct device *dev, struct device_attribute *attr,
297                     const char *buf, size_t count)
298 {
299         struct thermal_zone_device *tz = to_thermal_zone(dev);
300         struct thermal_cooling_device *cdev = NULL;
301         int state;
302
303         if (!sscanf(buf, "%d\n", &state))
304                 return -EINVAL;
305
306         /* sanity check: values below 1000 millicelcius don't make sense
307          * and can cause the system to go into a thermal heart attack
308          */
309         if (state && state < 1000)
310                 return -EINVAL;
311
312         if (state && !tz->forced_passive) {
313                 mutex_lock(&thermal_list_lock);
314                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
315                         if (!strncmp("Processor", cdev->type,
316                                      sizeof("Processor")))
317                                 thermal_zone_bind_cooling_device(tz,
318                                                 THERMAL_TRIPS_NONE, cdev,
319                                                 THERMAL_NO_LIMIT,
320                                                 THERMAL_NO_LIMIT);
321                 }
322                 mutex_unlock(&thermal_list_lock);
323                 if (!tz->passive_delay)
324                         tz->passive_delay = 1000;
325         } else if (!state && tz->forced_passive) {
326                 mutex_lock(&thermal_list_lock);
327                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
328                         if (!strncmp("Processor", cdev->type,
329                                      sizeof("Processor")))
330                                 thermal_zone_unbind_cooling_device(tz,
331                                                                    THERMAL_TRIPS_NONE,
332                                                                    cdev);
333                 }
334                 mutex_unlock(&thermal_list_lock);
335                 tz->passive_delay = 0;
336         }
337
338         tz->tc1 = 1;
339         tz->tc2 = 1;
340
341         tz->forced_passive = state;
342
343         thermal_zone_device_update(tz);
344
345         return count;
346 }
347
348 static ssize_t
349 passive_show(struct device *dev, struct device_attribute *attr,
350                    char *buf)
351 {
352         struct thermal_zone_device *tz = to_thermal_zone(dev);
353
354         return sprintf(buf, "%d\n", tz->forced_passive);
355 }
356
357 static DEVICE_ATTR(type, 0444, type_show, NULL);
358 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
359 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
360 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
361
362 /* sys I/F for cooling device */
363 #define to_cooling_device(_dev) \
364         container_of(_dev, struct thermal_cooling_device, device)
365
366 static ssize_t
367 thermal_cooling_device_type_show(struct device *dev,
368                                  struct device_attribute *attr, char *buf)
369 {
370         struct thermal_cooling_device *cdev = to_cooling_device(dev);
371
372         return sprintf(buf, "%s\n", cdev->type);
373 }
374
375 static ssize_t
376 thermal_cooling_device_max_state_show(struct device *dev,
377                                       struct device_attribute *attr, char *buf)
378 {
379         struct thermal_cooling_device *cdev = to_cooling_device(dev);
380         unsigned long state;
381         int ret;
382
383         ret = cdev->ops->get_max_state(cdev, &state);
384         if (ret)
385                 return ret;
386         return sprintf(buf, "%ld\n", state);
387 }
388
389 static ssize_t
390 thermal_cooling_device_cur_state_show(struct device *dev,
391                                       struct device_attribute *attr, char *buf)
392 {
393         struct thermal_cooling_device *cdev = to_cooling_device(dev);
394         unsigned long state;
395         int ret;
396
397         ret = cdev->ops->get_cur_state(cdev, &state);
398         if (ret)
399                 return ret;
400         return sprintf(buf, "%ld\n", state);
401 }
402
403 static ssize_t
404 thermal_cooling_device_cur_state_store(struct device *dev,
405                                        struct device_attribute *attr,
406                                        const char *buf, size_t count)
407 {
408         struct thermal_cooling_device *cdev = to_cooling_device(dev);
409         unsigned long state;
410         int result;
411
412         if (!sscanf(buf, "%ld\n", &state))
413                 return -EINVAL;
414
415         if ((long)state < 0)
416                 return -EINVAL;
417
418         result = cdev->ops->set_cur_state(cdev, state);
419         if (result)
420                 return result;
421         return count;
422 }
423
424 static struct device_attribute dev_attr_cdev_type =
425 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
426 static DEVICE_ATTR(max_state, 0444,
427                    thermal_cooling_device_max_state_show, NULL);
428 static DEVICE_ATTR(cur_state, 0644,
429                    thermal_cooling_device_cur_state_show,
430                    thermal_cooling_device_cur_state_store);
431
432 static ssize_t
433 thermal_cooling_device_trip_point_show(struct device *dev,
434                                        struct device_attribute *attr, char *buf)
435 {
436         struct thermal_cooling_device_instance *instance;
437
438         instance =
439             container_of(attr, struct thermal_cooling_device_instance, attr);
440
441         if (instance->trip == THERMAL_TRIPS_NONE)
442                 return sprintf(buf, "-1\n");
443         else
444                 return sprintf(buf, "%d\n", instance->trip);
445 }
446
447 /* Device management */
448
449 #if defined(CONFIG_THERMAL_HWMON)
450
451 /* hwmon sys I/F */
452 #include <linux/hwmon.h>
453
454 /* thermal zone devices with the same type share one hwmon device */
455 struct thermal_hwmon_device {
456         char type[THERMAL_NAME_LENGTH];
457         struct device *device;
458         int count;
459         struct list_head tz_list;
460         struct list_head node;
461 };
462
463 struct thermal_hwmon_attr {
464         struct device_attribute attr;
465         char name[16];
466 };
467
468 /* one temperature input for each thermal zone */
469 struct thermal_hwmon_temp {
470         struct list_head hwmon_node;
471         struct thermal_zone_device *tz;
472         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
473         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
474 };
475
476 static LIST_HEAD(thermal_hwmon_list);
477
478 static ssize_t
479 name_show(struct device *dev, struct device_attribute *attr, char *buf)
480 {
481         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
482         return sprintf(buf, "%s\n", hwmon->type);
483 }
484 static DEVICE_ATTR(name, 0444, name_show, NULL);
485
486 static ssize_t
487 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
488 {
489         long temperature;
490         int ret;
491         struct thermal_hwmon_attr *hwmon_attr
492                         = container_of(attr, struct thermal_hwmon_attr, attr);
493         struct thermal_hwmon_temp *temp
494                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
495                                        temp_input);
496         struct thermal_zone_device *tz = temp->tz;
497
498         ret = tz->ops->get_temp(tz, &temperature);
499
500         if (ret)
501                 return ret;
502
503         return sprintf(buf, "%ld\n", temperature);
504 }
505
506 static ssize_t
507 temp_crit_show(struct device *dev, struct device_attribute *attr,
508                 char *buf)
509 {
510         struct thermal_hwmon_attr *hwmon_attr
511                         = container_of(attr, struct thermal_hwmon_attr, attr);
512         struct thermal_hwmon_temp *temp
513                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
514                                        temp_crit);
515         struct thermal_zone_device *tz = temp->tz;
516         long temperature;
517         int ret;
518
519         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
520         if (ret)
521                 return ret;
522
523         return sprintf(buf, "%ld\n", temperature);
524 }
525
526
527 static struct thermal_hwmon_device *
528 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
529 {
530         struct thermal_hwmon_device *hwmon;
531
532         mutex_lock(&thermal_list_lock);
533         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
534                 if (!strcmp(hwmon->type, tz->type)) {
535                         mutex_unlock(&thermal_list_lock);
536                         return hwmon;
537                 }
538         mutex_unlock(&thermal_list_lock);
539
540         return NULL;
541 }
542
543 /* Find the temperature input matching a given thermal zone */
544 static struct thermal_hwmon_temp *
545 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
546                           const struct thermal_zone_device *tz)
547 {
548         struct thermal_hwmon_temp *temp;
549
550         mutex_lock(&thermal_list_lock);
551         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
552                 if (temp->tz == tz) {
553                         mutex_unlock(&thermal_list_lock);
554                         return temp;
555                 }
556         mutex_unlock(&thermal_list_lock);
557
558         return NULL;
559 }
560
561 static int
562 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
563 {
564         struct thermal_hwmon_device *hwmon;
565         struct thermal_hwmon_temp *temp;
566         int new_hwmon_device = 1;
567         int result;
568
569         hwmon = thermal_hwmon_lookup_by_type(tz);
570         if (hwmon) {
571                 new_hwmon_device = 0;
572                 goto register_sys_interface;
573         }
574
575         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
576         if (!hwmon)
577                 return -ENOMEM;
578
579         INIT_LIST_HEAD(&hwmon->tz_list);
580         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
581         hwmon->device = hwmon_device_register(NULL);
582         if (IS_ERR(hwmon->device)) {
583                 result = PTR_ERR(hwmon->device);
584                 goto free_mem;
585         }
586         dev_set_drvdata(hwmon->device, hwmon);
587         result = device_create_file(hwmon->device, &dev_attr_name);
588         if (result)
589                 goto free_mem;
590
591  register_sys_interface:
592         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
593         if (!temp) {
594                 result = -ENOMEM;
595                 goto unregister_name;
596         }
597
598         temp->tz = tz;
599         hwmon->count++;
600
601         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
602                  "temp%d_input", hwmon->count);
603         temp->temp_input.attr.attr.name = temp->temp_input.name;
604         temp->temp_input.attr.attr.mode = 0444;
605         temp->temp_input.attr.show = temp_input_show;
606         sysfs_attr_init(&temp->temp_input.attr.attr);
607         result = device_create_file(hwmon->device, &temp->temp_input.attr);
608         if (result)
609                 goto free_temp_mem;
610
611         if (tz->ops->get_crit_temp) {
612                 unsigned long temperature;
613                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
614                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
615                                 "temp%d_crit", hwmon->count);
616                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
617                         temp->temp_crit.attr.attr.mode = 0444;
618                         temp->temp_crit.attr.show = temp_crit_show;
619                         sysfs_attr_init(&temp->temp_crit.attr.attr);
620                         result = device_create_file(hwmon->device,
621                                                     &temp->temp_crit.attr);
622                         if (result)
623                                 goto unregister_input;
624                 }
625         }
626
627         mutex_lock(&thermal_list_lock);
628         if (new_hwmon_device)
629                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
630         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
631         mutex_unlock(&thermal_list_lock);
632
633         return 0;
634
635  unregister_input:
636         device_remove_file(hwmon->device, &temp->temp_input.attr);
637  free_temp_mem:
638         kfree(temp);
639  unregister_name:
640         if (new_hwmon_device) {
641                 device_remove_file(hwmon->device, &dev_attr_name);
642                 hwmon_device_unregister(hwmon->device);
643         }
644  free_mem:
645         if (new_hwmon_device)
646                 kfree(hwmon);
647
648         return result;
649 }
650
651 static void
652 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
653 {
654         struct thermal_hwmon_device *hwmon;
655         struct thermal_hwmon_temp *temp;
656
657         hwmon = thermal_hwmon_lookup_by_type(tz);
658         if (unlikely(!hwmon)) {
659                 /* Should never happen... */
660                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
661                 return;
662         }
663
664         temp = thermal_hwmon_lookup_temp(hwmon, tz);
665         if (unlikely(!temp)) {
666                 /* Should never happen... */
667                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
668                 return;
669         }
670
671         device_remove_file(hwmon->device, &temp->temp_input.attr);
672         if (tz->ops->get_crit_temp)
673                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
674
675         mutex_lock(&thermal_list_lock);
676         list_del(&temp->hwmon_node);
677         kfree(temp);
678         if (!list_empty(&hwmon->tz_list)) {
679                 mutex_unlock(&thermal_list_lock);
680                 return;
681         }
682         list_del(&hwmon->node);
683         mutex_unlock(&thermal_list_lock);
684
685         device_remove_file(hwmon->device, &dev_attr_name);
686         hwmon_device_unregister(hwmon->device);
687         kfree(hwmon);
688 }
689 #else
690 static int
691 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
692 {
693         return 0;
694 }
695
696 static void
697 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
698 {
699 }
700 #endif
701
702 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
703                                             int delay)
704 {
705         cancel_delayed_work(&(tz->poll_queue));
706
707         if (!delay)
708                 return;
709
710         if (delay > 1000)
711                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
712                                       round_jiffies(msecs_to_jiffies(delay)));
713         else
714                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
715                                       msecs_to_jiffies(delay));
716 }
717
718 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
719                                         int temp, int trip_temp, int trip)
720 {
721         int trend = 0;
722         struct thermal_cooling_device_instance *instance;
723         struct thermal_cooling_device *cdev;
724         long state, max_state;
725
726         if (!tz->ops->get_trend ||
727             tz->ops->get_trend(tz, trip, (enum thermal_trend *)&trend)) {
728                 /*
729                  * compare the current temperature and previous temperature
730                  * to get the thermal trend, if no special requirement
731                  */
732                 if (tz->temperature > tz->last_temperature)
733                         trend = THERMAL_TREND_RAISING;
734                 else if (tz->temperature < tz->last_temperature)
735                         trend = THERMAL_TREND_DROPPING;
736                 else
737                         trend = THERMAL_TREND_STABLE;
738         }
739
740         /*
741          * Above Trip?
742          * -----------
743          * Calculate the thermal trend (using the passive cooling equation)
744          * and modify the performance limit for all passive cooling devices
745          * accordingly.  Note that we assume symmetry.
746          */
747         if (temp >= trip_temp) {
748                 tz->passive = true;
749
750                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
751                         (tz->tc2 * (temp - trip_temp));
752
753                 /* Heating up? */
754                 if (trend > 0) {
755                         list_for_each_entry(instance, &tz->cooling_devices,
756                                             node) {
757                                 if (instance->trip != trip)
758                                         continue;
759                                 cdev = instance->cdev;
760                                 cdev->ops->get_cur_state(cdev, &state);
761                                 cdev->ops->get_max_state(cdev, &max_state);
762                                 if (state++ < max_state)
763                                         cdev->ops->set_cur_state(cdev, state);
764                         }
765                 } else if (trend < 0) { /* Cooling off? */
766                         list_for_each_entry(instance, &tz->cooling_devices,
767                                             node) {
768                                 if (instance->trip != trip)
769                                         continue;
770                                 cdev = instance->cdev;
771                                 cdev->ops->get_cur_state(cdev, &state);
772                                 cdev->ops->get_max_state(cdev, &max_state);
773                                 if (state > 0)
774                                         cdev->ops->set_cur_state(cdev, --state);
775                         }
776                 }
777                 return;
778         }
779
780         /*
781          * Below Trip?
782          * -----------
783          * Implement passive cooling hysteresis to slowly increase performance
784          * and avoid thrashing around the passive trip point.  Note that we
785          * assume symmetry.
786          */
787         list_for_each_entry(instance, &tz->cooling_devices, node) {
788                 if (instance->trip != trip)
789                         continue;
790                 cdev = instance->cdev;
791                 cdev->ops->get_cur_state(cdev, &state);
792                 cdev->ops->get_max_state(cdev, &max_state);
793                 if (state > 0)
794                         cdev->ops->set_cur_state(cdev, --state);
795                 if (state == 0)
796                         tz->passive = false;
797         }
798 }
799
800 static void thermal_zone_device_check(struct work_struct *work)
801 {
802         struct thermal_zone_device *tz = container_of(work, struct
803                                                       thermal_zone_device,
804                                                       poll_queue.work);
805         thermal_zone_device_update(tz);
806 }
807
808 /**
809  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
810  * @tz:         thermal zone device
811  * @trip:       indicates which trip point the cooling devices is
812  *              associated with in this thermal zone.
813  * @cdev:       thermal cooling device
814  *
815  * This function is usually called in the thermal zone device .bind callback.
816  */
817 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
818                                      int trip,
819                                      struct thermal_cooling_device *cdev,
820                                      unsigned long upper, unsigned long lower)
821 {
822         struct thermal_cooling_device_instance *dev;
823         struct thermal_cooling_device_instance *pos;
824         struct thermal_zone_device *pos1;
825         struct thermal_cooling_device *pos2;
826         unsigned long max_state;
827         int result;
828
829         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
830                 return -EINVAL;
831
832         list_for_each_entry(pos1, &thermal_tz_list, node) {
833                 if (pos1 == tz)
834                         break;
835         }
836         list_for_each_entry(pos2, &thermal_cdev_list, node) {
837                 if (pos2 == cdev)
838                         break;
839         }
840
841         if (tz != pos1 || cdev != pos2)
842                 return -EINVAL;
843
844         cdev->ops->get_max_state(cdev, &max_state);
845
846         /* lower default 0, upper default max_state */
847         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
848         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
849
850         if (lower > upper || upper > max_state)
851                 return -EINVAL;
852
853         dev =
854             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
855         if (!dev)
856                 return -ENOMEM;
857         dev->tz = tz;
858         dev->cdev = cdev;
859         dev->trip = trip;
860         dev->upper = upper;
861         dev->lower = lower;
862
863         result = get_idr(&tz->idr, &tz->lock, &dev->id);
864         if (result)
865                 goto free_mem;
866
867         sprintf(dev->name, "cdev%d", dev->id);
868         result =
869             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
870         if (result)
871                 goto release_idr;
872
873         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
874         sysfs_attr_init(&dev->attr.attr);
875         dev->attr.attr.name = dev->attr_name;
876         dev->attr.attr.mode = 0444;
877         dev->attr.show = thermal_cooling_device_trip_point_show;
878         result = device_create_file(&tz->device, &dev->attr);
879         if (result)
880                 goto remove_symbol_link;
881
882         mutex_lock(&tz->lock);
883         list_for_each_entry(pos, &tz->cooling_devices, node)
884             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
885                 result = -EEXIST;
886                 break;
887         }
888         if (!result)
889                 list_add_tail(&dev->node, &tz->cooling_devices);
890         mutex_unlock(&tz->lock);
891
892         if (!result)
893                 return 0;
894
895         device_remove_file(&tz->device, &dev->attr);
896 remove_symbol_link:
897         sysfs_remove_link(&tz->device.kobj, dev->name);
898 release_idr:
899         release_idr(&tz->idr, &tz->lock, dev->id);
900 free_mem:
901         kfree(dev);
902         return result;
903 }
904 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
905
906 /**
907  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
908  * @tz:         thermal zone device
909  * @trip:       indicates which trip point the cooling devices is
910  *              associated with in this thermal zone.
911  * @cdev:       thermal cooling device
912  *
913  * This function is usually called in the thermal zone device .unbind callback.
914  */
915 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
916                                        int trip,
917                                        struct thermal_cooling_device *cdev)
918 {
919         struct thermal_cooling_device_instance *pos, *next;
920
921         mutex_lock(&tz->lock);
922         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
923                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
924                         list_del(&pos->node);
925                         mutex_unlock(&tz->lock);
926                         goto unbind;
927                 }
928         }
929         mutex_unlock(&tz->lock);
930
931         return -ENODEV;
932
933 unbind:
934         device_remove_file(&tz->device, &pos->attr);
935         sysfs_remove_link(&tz->device.kobj, pos->name);
936         release_idr(&tz->idr, &tz->lock, pos->id);
937         kfree(pos);
938         return 0;
939 }
940 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
941
942 static void thermal_release(struct device *dev)
943 {
944         struct thermal_zone_device *tz;
945         struct thermal_cooling_device *cdev;
946
947         if (!strncmp(dev_name(dev), "thermal_zone",
948                      sizeof("thermal_zone") - 1)) {
949                 tz = to_thermal_zone(dev);
950                 kfree(tz);
951         } else {
952                 cdev = to_cooling_device(dev);
953                 kfree(cdev);
954         }
955 }
956
957 static struct class thermal_class = {
958         .name = "thermal",
959         .dev_release = thermal_release,
960 };
961
962 /**
963  * thermal_cooling_device_register - register a new thermal cooling device
964  * @type:       the thermal cooling device type.
965  * @devdata:    device private data.
966  * @ops:                standard thermal cooling devices callbacks.
967  */
968 struct thermal_cooling_device *
969 thermal_cooling_device_register(char *type, void *devdata,
970                                 const struct thermal_cooling_device_ops *ops)
971 {
972         struct thermal_cooling_device *cdev;
973         struct thermal_zone_device *pos;
974         int result;
975
976         if (strlen(type) >= THERMAL_NAME_LENGTH)
977                 return ERR_PTR(-EINVAL);
978
979         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
980             !ops->set_cur_state)
981                 return ERR_PTR(-EINVAL);
982
983         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
984         if (!cdev)
985                 return ERR_PTR(-ENOMEM);
986
987         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
988         if (result) {
989                 kfree(cdev);
990                 return ERR_PTR(result);
991         }
992
993         strcpy(cdev->type, type);
994         cdev->ops = ops;
995         cdev->device.class = &thermal_class;
996         cdev->devdata = devdata;
997         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
998         result = device_register(&cdev->device);
999         if (result) {
1000                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1001                 kfree(cdev);
1002                 return ERR_PTR(result);
1003         }
1004
1005         /* sys I/F */
1006         if (type) {
1007                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1008                 if (result)
1009                         goto unregister;
1010         }
1011
1012         result = device_create_file(&cdev->device, &dev_attr_max_state);
1013         if (result)
1014                 goto unregister;
1015
1016         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1017         if (result)
1018                 goto unregister;
1019
1020         mutex_lock(&thermal_list_lock);
1021         list_add(&cdev->node, &thermal_cdev_list);
1022         list_for_each_entry(pos, &thermal_tz_list, node) {
1023                 if (!pos->ops->bind)
1024                         continue;
1025                 result = pos->ops->bind(pos, cdev);
1026                 if (result)
1027                         break;
1028
1029         }
1030         mutex_unlock(&thermal_list_lock);
1031
1032         if (!result)
1033                 return cdev;
1034
1035 unregister:
1036         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1037         device_unregister(&cdev->device);
1038         return ERR_PTR(result);
1039 }
1040 EXPORT_SYMBOL(thermal_cooling_device_register);
1041
1042 /**
1043  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1044  * @cdev:       the thermal cooling device to remove.
1045  *
1046  * thermal_cooling_device_unregister() must be called when the device is no
1047  * longer needed.
1048  */
1049 void thermal_cooling_device_unregister(struct
1050                                        thermal_cooling_device
1051                                        *cdev)
1052 {
1053         struct thermal_zone_device *tz;
1054         struct thermal_cooling_device *pos = NULL;
1055
1056         if (!cdev)
1057                 return;
1058
1059         mutex_lock(&thermal_list_lock);
1060         list_for_each_entry(pos, &thermal_cdev_list, node)
1061             if (pos == cdev)
1062                 break;
1063         if (pos != cdev) {
1064                 /* thermal cooling device not found */
1065                 mutex_unlock(&thermal_list_lock);
1066                 return;
1067         }
1068         list_del(&cdev->node);
1069         list_for_each_entry(tz, &thermal_tz_list, node) {
1070                 if (!tz->ops->unbind)
1071                         continue;
1072                 tz->ops->unbind(tz, cdev);
1073         }
1074         mutex_unlock(&thermal_list_lock);
1075         if (cdev->type[0])
1076                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1077         device_remove_file(&cdev->device, &dev_attr_max_state);
1078         device_remove_file(&cdev->device, &dev_attr_cur_state);
1079
1080         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1081         device_unregister(&cdev->device);
1082         return;
1083 }
1084 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1085
1086 /**
1087  * thermal_zone_device_update - force an update of a thermal zone's state
1088  * @ttz:        the thermal zone to update
1089  */
1090
1091 void thermal_zone_device_update(struct thermal_zone_device *tz)
1092 {
1093         int count, ret = 0;
1094         long temp, trip_temp;
1095         enum thermal_trip_type trip_type;
1096         struct thermal_cooling_device_instance *instance;
1097         struct thermal_cooling_device *cdev;
1098         unsigned long cur_state, max_state;
1099
1100         mutex_lock(&tz->lock);
1101
1102         if (tz->ops->get_temp(tz, &temp)) {
1103                 /* get_temp failed - retry it later */
1104                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1105                 goto leave;
1106         }
1107
1108         tz->last_temperature = tz->temperature;
1109         tz->temperature = temp;
1110
1111         for (count = 0; count < tz->trips; count++) {
1112                 tz->ops->get_trip_type(tz, count, &trip_type);
1113                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1114
1115                 switch (trip_type) {
1116                 case THERMAL_TRIP_CRITICAL:
1117                         if (temp >= trip_temp) {
1118                                 if (tz->ops->notify)
1119                                         ret = tz->ops->notify(tz, count,
1120                                                               trip_type);
1121                                 if (!ret) {
1122                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1123                                                  temp/1000);
1124                                         orderly_poweroff(true);
1125                                 }
1126                         }
1127                         break;
1128                 case THERMAL_TRIP_HOT:
1129                         if (temp >= trip_temp)
1130                                 if (tz->ops->notify)
1131                                         tz->ops->notify(tz, count, trip_type);
1132                         break;
1133                 case THERMAL_TRIP_ACTIVE:
1134                         list_for_each_entry(instance, &tz->cooling_devices,
1135                                             node) {
1136                                 if (instance->trip != count)
1137                                         continue;
1138
1139                                 cdev = instance->cdev;
1140
1141                                 cdev->ops->get_cur_state(cdev, &cur_state);
1142                                 cdev->ops->get_max_state(cdev, &max_state);
1143
1144                                 if (temp >= trip_temp)
1145                                         cur_state =
1146                                                 cur_state < instance->upper ?
1147                                                 (cur_state + 1) :
1148                                                 instance->upper;
1149                                 else
1150                                         cur_state =
1151                                                 cur_state > instance->lower ?
1152                                                 (cur_state - 1) :
1153                                                 instance->lower;
1154
1155                                 cdev->ops->set_cur_state(cdev, cur_state);
1156                         }
1157                         break;
1158                 case THERMAL_TRIP_PASSIVE:
1159                         if (temp >= trip_temp || tz->passive)
1160                                 thermal_zone_device_passive(tz, temp,
1161                                                             trip_temp, count);
1162                         break;
1163                 }
1164         }
1165
1166         if (tz->forced_passive)
1167                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1168                                             THERMAL_TRIPS_NONE);
1169
1170 leave:
1171         if (tz->passive)
1172                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1173         else if (tz->polling_delay)
1174                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1175         else
1176                 thermal_zone_device_set_polling(tz, 0);
1177         mutex_unlock(&tz->lock);
1178 }
1179 EXPORT_SYMBOL(thermal_zone_device_update);
1180
1181 struct thermal_zone_device *thermal_zone_device_find(void *data,
1182         int (*match)(struct thermal_zone_device *, void *))
1183 {
1184         struct thermal_zone_device *thz;
1185
1186         mutex_lock(&thermal_list_lock);
1187         list_for_each_entry(thz, &thermal_tz_list, node)
1188                 if (match(thz, data)) {
1189                         mutex_unlock(&thermal_list_lock);
1190                         return thz;
1191                 }
1192
1193         mutex_unlock(&thermal_list_lock);
1194         return NULL;
1195 }
1196 EXPORT_SYMBOL(thermal_zone_device_find);
1197
1198 /**
1199  * create_trip_attrs - create attributes for trip points
1200  * @tz:         the thermal zone device
1201  * @mask:       Writeable trip point bitmap.
1202  */
1203 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1204 {
1205         int indx;
1206         int size = sizeof(struct thermal_attr) * tz->trips;
1207
1208         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1209         if (!tz->trip_type_attrs)
1210                 return -ENOMEM;
1211
1212         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1213         if (!tz->trip_temp_attrs) {
1214                 kfree(tz->trip_type_attrs);
1215                 return -ENOMEM;
1216         }
1217
1218         if (tz->ops->get_trip_hyst) {
1219                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1220                 if (!tz->trip_hyst_attrs) {
1221                         kfree(tz->trip_type_attrs);
1222                         kfree(tz->trip_temp_attrs);
1223                         return -ENOMEM;
1224                 }
1225         }
1226
1227
1228         for (indx = 0; indx < tz->trips; indx++) {
1229                 /* create trip type attribute */
1230                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1231                          "trip_point_%d_type", indx);
1232
1233                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1234                 tz->trip_type_attrs[indx].attr.attr.name =
1235                                                 tz->trip_type_attrs[indx].name;
1236                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1237                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1238
1239                 device_create_file(&tz->device,
1240                                    &tz->trip_type_attrs[indx].attr);
1241
1242                 /* create trip temp attribute */
1243                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1244                          "trip_point_%d_temp", indx);
1245
1246                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1247                 tz->trip_temp_attrs[indx].attr.attr.name =
1248                                                 tz->trip_temp_attrs[indx].name;
1249                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1250                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1251                 if (mask & (1 << indx)) {
1252                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1253                         tz->trip_temp_attrs[indx].attr.store =
1254                                                         trip_point_temp_store;
1255                 }
1256
1257                 device_create_file(&tz->device,
1258                                    &tz->trip_temp_attrs[indx].attr);
1259
1260                 /* create Optional trip hyst attribute */
1261                 if (!tz->ops->get_trip_hyst)
1262                         continue;
1263                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1264                          "trip_point_%d_hyst", indx);
1265
1266                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1267                 tz->trip_hyst_attrs[indx].attr.attr.name =
1268                                         tz->trip_hyst_attrs[indx].name;
1269                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1270                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1271                 if (tz->ops->set_trip_hyst) {
1272                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1273                         tz->trip_hyst_attrs[indx].attr.store =
1274                                         trip_point_hyst_store;
1275                 }
1276
1277                 device_create_file(&tz->device,
1278                                    &tz->trip_hyst_attrs[indx].attr);
1279         }
1280         return 0;
1281 }
1282
1283 static void remove_trip_attrs(struct thermal_zone_device *tz)
1284 {
1285         int indx;
1286
1287         for (indx = 0; indx < tz->trips; indx++) {
1288                 device_remove_file(&tz->device,
1289                                    &tz->trip_type_attrs[indx].attr);
1290                 device_remove_file(&tz->device,
1291                                    &tz->trip_temp_attrs[indx].attr);
1292                 if (tz->ops->get_trip_hyst)
1293                         device_remove_file(&tz->device,
1294                                   &tz->trip_hyst_attrs[indx].attr);
1295         }
1296         kfree(tz->trip_type_attrs);
1297         kfree(tz->trip_temp_attrs);
1298         kfree(tz->trip_hyst_attrs);
1299 }
1300
1301 /**
1302  * thermal_zone_device_register - register a new thermal zone device
1303  * @type:       the thermal zone device type
1304  * @trips:      the number of trip points the thermal zone support
1305  * @mask:       a bit string indicating the writeablility of trip points
1306  * @devdata:    private device data
1307  * @ops:        standard thermal zone device callbacks
1308  * @tc1:        thermal coefficient 1 for passive calculations
1309  * @tc2:        thermal coefficient 2 for passive calculations
1310  * @passive_delay: number of milliseconds to wait between polls when
1311  *                 performing passive cooling
1312  * @polling_delay: number of milliseconds to wait between polls when checking
1313  *                 whether trip points have been crossed (0 for interrupt
1314  *                 driven systems)
1315  *
1316  * thermal_zone_device_unregister() must be called when the device is no
1317  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1318  * section 11.1.5.1 of the ACPI specification 3.0.
1319  */
1320 struct thermal_zone_device *thermal_zone_device_register(char *type,
1321         int trips, int mask, void *devdata,
1322         const struct thermal_zone_device_ops *ops,
1323         int tc1, int tc2, int passive_delay, int polling_delay)
1324 {
1325         struct thermal_zone_device *tz;
1326         struct thermal_cooling_device *pos;
1327         enum thermal_trip_type trip_type;
1328         int result;
1329         int count;
1330         int passive = 0;
1331
1332         if (strlen(type) >= THERMAL_NAME_LENGTH)
1333                 return ERR_PTR(-EINVAL);
1334
1335         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1336                 return ERR_PTR(-EINVAL);
1337
1338         if (!ops || !ops->get_temp)
1339                 return ERR_PTR(-EINVAL);
1340
1341         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1342         if (!tz)
1343                 return ERR_PTR(-ENOMEM);
1344
1345         INIT_LIST_HEAD(&tz->cooling_devices);
1346         idr_init(&tz->idr);
1347         mutex_init(&tz->lock);
1348         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1349         if (result) {
1350                 kfree(tz);
1351                 return ERR_PTR(result);
1352         }
1353
1354         strcpy(tz->type, type);
1355         tz->ops = ops;
1356         tz->device.class = &thermal_class;
1357         tz->devdata = devdata;
1358         tz->trips = trips;
1359         tz->tc1 = tc1;
1360         tz->tc2 = tc2;
1361         tz->passive_delay = passive_delay;
1362         tz->polling_delay = polling_delay;
1363
1364         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1365         result = device_register(&tz->device);
1366         if (result) {
1367                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1368                 kfree(tz);
1369                 return ERR_PTR(result);
1370         }
1371
1372         /* sys I/F */
1373         if (type) {
1374                 result = device_create_file(&tz->device, &dev_attr_type);
1375                 if (result)
1376                         goto unregister;
1377         }
1378
1379         result = device_create_file(&tz->device, &dev_attr_temp);
1380         if (result)
1381                 goto unregister;
1382
1383         if (ops->get_mode) {
1384                 result = device_create_file(&tz->device, &dev_attr_mode);
1385                 if (result)
1386                         goto unregister;
1387         }
1388
1389         result = create_trip_attrs(tz, mask);
1390         if (result)
1391                 goto unregister;
1392
1393         for (count = 0; count < trips; count++) {
1394                 tz->ops->get_trip_type(tz, count, &trip_type);
1395                 if (trip_type == THERMAL_TRIP_PASSIVE)
1396                         passive = 1;
1397         }
1398
1399         if (!passive)
1400                 result = device_create_file(&tz->device,
1401                                             &dev_attr_passive);
1402
1403         if (result)
1404                 goto unregister;
1405
1406         result = thermal_add_hwmon_sysfs(tz);
1407         if (result)
1408                 goto unregister;
1409
1410         mutex_lock(&thermal_list_lock);
1411         list_add_tail(&tz->node, &thermal_tz_list);
1412         if (ops->bind)
1413                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1414                 result = ops->bind(tz, pos);
1415                 if (result)
1416                         break;
1417                 }
1418         mutex_unlock(&thermal_list_lock);
1419
1420         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1421
1422         thermal_zone_device_update(tz);
1423
1424         if (!result)
1425                 return tz;
1426
1427 unregister:
1428         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1429         device_unregister(&tz->device);
1430         return ERR_PTR(result);
1431 }
1432 EXPORT_SYMBOL(thermal_zone_device_register);
1433
1434 /**
1435  * thermal_device_unregister - removes the registered thermal zone device
1436  * @tz: the thermal zone device to remove
1437  */
1438 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1439 {
1440         struct thermal_cooling_device *cdev;
1441         struct thermal_zone_device *pos = NULL;
1442
1443         if (!tz)
1444                 return;
1445
1446         mutex_lock(&thermal_list_lock);
1447         list_for_each_entry(pos, &thermal_tz_list, node)
1448             if (pos == tz)
1449                 break;
1450         if (pos != tz) {
1451                 /* thermal zone device not found */
1452                 mutex_unlock(&thermal_list_lock);
1453                 return;
1454         }
1455         list_del(&tz->node);
1456         if (tz->ops->unbind)
1457                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1458                     tz->ops->unbind(tz, cdev);
1459         mutex_unlock(&thermal_list_lock);
1460
1461         thermal_zone_device_set_polling(tz, 0);
1462
1463         if (tz->type[0])
1464                 device_remove_file(&tz->device, &dev_attr_type);
1465         device_remove_file(&tz->device, &dev_attr_temp);
1466         if (tz->ops->get_mode)
1467                 device_remove_file(&tz->device, &dev_attr_mode);
1468         remove_trip_attrs(tz);
1469
1470         thermal_remove_hwmon_sysfs(tz);
1471         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1472         idr_destroy(&tz->idr);
1473         mutex_destroy(&tz->lock);
1474         device_unregister(&tz->device);
1475         return;
1476 }
1477 EXPORT_SYMBOL(thermal_zone_device_unregister);
1478
1479 #ifdef CONFIG_NET
1480 static struct genl_family thermal_event_genl_family = {
1481         .id = GENL_ID_GENERATE,
1482         .name = THERMAL_GENL_FAMILY_NAME,
1483         .version = THERMAL_GENL_VERSION,
1484         .maxattr = THERMAL_GENL_ATTR_MAX,
1485 };
1486
1487 static struct genl_multicast_group thermal_event_mcgrp = {
1488         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1489 };
1490
1491 int thermal_generate_netlink_event(u32 orig, enum events event)
1492 {
1493         struct sk_buff *skb;
1494         struct nlattr *attr;
1495         struct thermal_genl_event *thermal_event;
1496         void *msg_header;
1497         int size;
1498         int result;
1499         static unsigned int thermal_event_seqnum;
1500
1501         /* allocate memory */
1502         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1503                nla_total_size(0);
1504
1505         skb = genlmsg_new(size, GFP_ATOMIC);
1506         if (!skb)
1507                 return -ENOMEM;
1508
1509         /* add the genetlink message header */
1510         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1511                                  &thermal_event_genl_family, 0,
1512                                  THERMAL_GENL_CMD_EVENT);
1513         if (!msg_header) {
1514                 nlmsg_free(skb);
1515                 return -ENOMEM;
1516         }
1517
1518         /* fill the data */
1519         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1520                            sizeof(struct thermal_genl_event));
1521
1522         if (!attr) {
1523                 nlmsg_free(skb);
1524                 return -EINVAL;
1525         }
1526
1527         thermal_event = nla_data(attr);
1528         if (!thermal_event) {
1529                 nlmsg_free(skb);
1530                 return -EINVAL;
1531         }
1532
1533         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1534
1535         thermal_event->orig = orig;
1536         thermal_event->event = event;
1537
1538         /* send multicast genetlink message */
1539         result = genlmsg_end(skb, msg_header);
1540         if (result < 0) {
1541                 nlmsg_free(skb);
1542                 return result;
1543         }
1544
1545         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1546         if (result)
1547                 pr_info("failed to send netlink event:%d\n", result);
1548
1549         return result;
1550 }
1551 EXPORT_SYMBOL(thermal_generate_netlink_event);
1552
1553 static int genetlink_init(void)
1554 {
1555         int result;
1556
1557         result = genl_register_family(&thermal_event_genl_family);
1558         if (result)
1559                 return result;
1560
1561         result = genl_register_mc_group(&thermal_event_genl_family,
1562                                         &thermal_event_mcgrp);
1563         if (result)
1564                 genl_unregister_family(&thermal_event_genl_family);
1565         return result;
1566 }
1567
1568 static void genetlink_exit(void)
1569 {
1570         genl_unregister_family(&thermal_event_genl_family);
1571 }
1572 #else /* !CONFIG_NET */
1573 static inline int genetlink_init(void) { return 0; }
1574 static inline void genetlink_exit(void) {}
1575 #endif /* !CONFIG_NET */
1576
1577 static int __init thermal_init(void)
1578 {
1579         int result = 0;
1580
1581         result = class_register(&thermal_class);
1582         if (result) {
1583                 idr_destroy(&thermal_tz_idr);
1584                 idr_destroy(&thermal_cdev_idr);
1585                 mutex_destroy(&thermal_idr_lock);
1586                 mutex_destroy(&thermal_list_lock);
1587         }
1588         result = genetlink_init();
1589         return result;
1590 }
1591
1592 static void __exit thermal_exit(void)
1593 {
1594         class_unregister(&thermal_class);
1595         idr_destroy(&thermal_tz_idr);
1596         idr_destroy(&thermal_cdev_idr);
1597         mutex_destroy(&thermal_idr_lock);
1598         mutex_destroy(&thermal_list_lock);
1599         genetlink_exit();
1600 }
1601
1602 fs_initcall(thermal_init);
1603 module_exit(thermal_exit);