ab9ea13ed5e39ed5aeaf3079c550bdb7c9121782
[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->forced_passive = state;
339
340         thermal_zone_device_update(tz);
341
342         return count;
343 }
344
345 static ssize_t
346 passive_show(struct device *dev, struct device_attribute *attr,
347                    char *buf)
348 {
349         struct thermal_zone_device *tz = to_thermal_zone(dev);
350
351         return sprintf(buf, "%d\n", tz->forced_passive);
352 }
353
354 static DEVICE_ATTR(type, 0444, type_show, NULL);
355 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
356 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
357 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
358
359 /* sys I/F for cooling device */
360 #define to_cooling_device(_dev) \
361         container_of(_dev, struct thermal_cooling_device, device)
362
363 static ssize_t
364 thermal_cooling_device_type_show(struct device *dev,
365                                  struct device_attribute *attr, char *buf)
366 {
367         struct thermal_cooling_device *cdev = to_cooling_device(dev);
368
369         return sprintf(buf, "%s\n", cdev->type);
370 }
371
372 static ssize_t
373 thermal_cooling_device_max_state_show(struct device *dev,
374                                       struct device_attribute *attr, char *buf)
375 {
376         struct thermal_cooling_device *cdev = to_cooling_device(dev);
377         unsigned long state;
378         int ret;
379
380         ret = cdev->ops->get_max_state(cdev, &state);
381         if (ret)
382                 return ret;
383         return sprintf(buf, "%ld\n", state);
384 }
385
386 static ssize_t
387 thermal_cooling_device_cur_state_show(struct device *dev,
388                                       struct device_attribute *attr, char *buf)
389 {
390         struct thermal_cooling_device *cdev = to_cooling_device(dev);
391         unsigned long state;
392         int ret;
393
394         ret = cdev->ops->get_cur_state(cdev, &state);
395         if (ret)
396                 return ret;
397         return sprintf(buf, "%ld\n", state);
398 }
399
400 static ssize_t
401 thermal_cooling_device_cur_state_store(struct device *dev,
402                                        struct device_attribute *attr,
403                                        const char *buf, size_t count)
404 {
405         struct thermal_cooling_device *cdev = to_cooling_device(dev);
406         unsigned long state;
407         int result;
408
409         if (!sscanf(buf, "%ld\n", &state))
410                 return -EINVAL;
411
412         if ((long)state < 0)
413                 return -EINVAL;
414
415         result = cdev->ops->set_cur_state(cdev, state);
416         if (result)
417                 return result;
418         return count;
419 }
420
421 static struct device_attribute dev_attr_cdev_type =
422 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
423 static DEVICE_ATTR(max_state, 0444,
424                    thermal_cooling_device_max_state_show, NULL);
425 static DEVICE_ATTR(cur_state, 0644,
426                    thermal_cooling_device_cur_state_show,
427                    thermal_cooling_device_cur_state_store);
428
429 static ssize_t
430 thermal_cooling_device_trip_point_show(struct device *dev,
431                                        struct device_attribute *attr, char *buf)
432 {
433         struct thermal_cooling_device_instance *instance;
434
435         instance =
436             container_of(attr, struct thermal_cooling_device_instance, attr);
437
438         if (instance->trip == THERMAL_TRIPS_NONE)
439                 return sprintf(buf, "-1\n");
440         else
441                 return sprintf(buf, "%d\n", instance->trip);
442 }
443
444 /* Device management */
445
446 #if defined(CONFIG_THERMAL_HWMON)
447
448 /* hwmon sys I/F */
449 #include <linux/hwmon.h>
450
451 /* thermal zone devices with the same type share one hwmon device */
452 struct thermal_hwmon_device {
453         char type[THERMAL_NAME_LENGTH];
454         struct device *device;
455         int count;
456         struct list_head tz_list;
457         struct list_head node;
458 };
459
460 struct thermal_hwmon_attr {
461         struct device_attribute attr;
462         char name[16];
463 };
464
465 /* one temperature input for each thermal zone */
466 struct thermal_hwmon_temp {
467         struct list_head hwmon_node;
468         struct thermal_zone_device *tz;
469         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
470         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
471 };
472
473 static LIST_HEAD(thermal_hwmon_list);
474
475 static ssize_t
476 name_show(struct device *dev, struct device_attribute *attr, char *buf)
477 {
478         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
479         return sprintf(buf, "%s\n", hwmon->type);
480 }
481 static DEVICE_ATTR(name, 0444, name_show, NULL);
482
483 static ssize_t
484 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
485 {
486         long temperature;
487         int ret;
488         struct thermal_hwmon_attr *hwmon_attr
489                         = container_of(attr, struct thermal_hwmon_attr, attr);
490         struct thermal_hwmon_temp *temp
491                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
492                                        temp_input);
493         struct thermal_zone_device *tz = temp->tz;
494
495         ret = tz->ops->get_temp(tz, &temperature);
496
497         if (ret)
498                 return ret;
499
500         return sprintf(buf, "%ld\n", temperature);
501 }
502
503 static ssize_t
504 temp_crit_show(struct device *dev, struct device_attribute *attr,
505                 char *buf)
506 {
507         struct thermal_hwmon_attr *hwmon_attr
508                         = container_of(attr, struct thermal_hwmon_attr, attr);
509         struct thermal_hwmon_temp *temp
510                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
511                                        temp_crit);
512         struct thermal_zone_device *tz = temp->tz;
513         long temperature;
514         int ret;
515
516         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
517         if (ret)
518                 return ret;
519
520         return sprintf(buf, "%ld\n", temperature);
521 }
522
523
524 static struct thermal_hwmon_device *
525 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
526 {
527         struct thermal_hwmon_device *hwmon;
528
529         mutex_lock(&thermal_list_lock);
530         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
531                 if (!strcmp(hwmon->type, tz->type)) {
532                         mutex_unlock(&thermal_list_lock);
533                         return hwmon;
534                 }
535         mutex_unlock(&thermal_list_lock);
536
537         return NULL;
538 }
539
540 /* Find the temperature input matching a given thermal zone */
541 static struct thermal_hwmon_temp *
542 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
543                           const struct thermal_zone_device *tz)
544 {
545         struct thermal_hwmon_temp *temp;
546
547         mutex_lock(&thermal_list_lock);
548         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
549                 if (temp->tz == tz) {
550                         mutex_unlock(&thermal_list_lock);
551                         return temp;
552                 }
553         mutex_unlock(&thermal_list_lock);
554
555         return NULL;
556 }
557
558 static int
559 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
560 {
561         struct thermal_hwmon_device *hwmon;
562         struct thermal_hwmon_temp *temp;
563         int new_hwmon_device = 1;
564         int result;
565
566         hwmon = thermal_hwmon_lookup_by_type(tz);
567         if (hwmon) {
568                 new_hwmon_device = 0;
569                 goto register_sys_interface;
570         }
571
572         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
573         if (!hwmon)
574                 return -ENOMEM;
575
576         INIT_LIST_HEAD(&hwmon->tz_list);
577         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
578         hwmon->device = hwmon_device_register(NULL);
579         if (IS_ERR(hwmon->device)) {
580                 result = PTR_ERR(hwmon->device);
581                 goto free_mem;
582         }
583         dev_set_drvdata(hwmon->device, hwmon);
584         result = device_create_file(hwmon->device, &dev_attr_name);
585         if (result)
586                 goto free_mem;
587
588  register_sys_interface:
589         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
590         if (!temp) {
591                 result = -ENOMEM;
592                 goto unregister_name;
593         }
594
595         temp->tz = tz;
596         hwmon->count++;
597
598         snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
599                  "temp%d_input", hwmon->count);
600         temp->temp_input.attr.attr.name = temp->temp_input.name;
601         temp->temp_input.attr.attr.mode = 0444;
602         temp->temp_input.attr.show = temp_input_show;
603         sysfs_attr_init(&temp->temp_input.attr.attr);
604         result = device_create_file(hwmon->device, &temp->temp_input.attr);
605         if (result)
606                 goto free_temp_mem;
607
608         if (tz->ops->get_crit_temp) {
609                 unsigned long temperature;
610                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
611                         snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
612                                 "temp%d_crit", hwmon->count);
613                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
614                         temp->temp_crit.attr.attr.mode = 0444;
615                         temp->temp_crit.attr.show = temp_crit_show;
616                         sysfs_attr_init(&temp->temp_crit.attr.attr);
617                         result = device_create_file(hwmon->device,
618                                                     &temp->temp_crit.attr);
619                         if (result)
620                                 goto unregister_input;
621                 }
622         }
623
624         mutex_lock(&thermal_list_lock);
625         if (new_hwmon_device)
626                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
627         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
628         mutex_unlock(&thermal_list_lock);
629
630         return 0;
631
632  unregister_input:
633         device_remove_file(hwmon->device, &temp->temp_input.attr);
634  free_temp_mem:
635         kfree(temp);
636  unregister_name:
637         if (new_hwmon_device) {
638                 device_remove_file(hwmon->device, &dev_attr_name);
639                 hwmon_device_unregister(hwmon->device);
640         }
641  free_mem:
642         if (new_hwmon_device)
643                 kfree(hwmon);
644
645         return result;
646 }
647
648 static void
649 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
650 {
651         struct thermal_hwmon_device *hwmon;
652         struct thermal_hwmon_temp *temp;
653
654         hwmon = thermal_hwmon_lookup_by_type(tz);
655         if (unlikely(!hwmon)) {
656                 /* Should never happen... */
657                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
658                 return;
659         }
660
661         temp = thermal_hwmon_lookup_temp(hwmon, tz);
662         if (unlikely(!temp)) {
663                 /* Should never happen... */
664                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
665                 return;
666         }
667
668         device_remove_file(hwmon->device, &temp->temp_input.attr);
669         if (tz->ops->get_crit_temp)
670                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
671
672         mutex_lock(&thermal_list_lock);
673         list_del(&temp->hwmon_node);
674         kfree(temp);
675         if (!list_empty(&hwmon->tz_list)) {
676                 mutex_unlock(&thermal_list_lock);
677                 return;
678         }
679         list_del(&hwmon->node);
680         mutex_unlock(&thermal_list_lock);
681
682         device_remove_file(hwmon->device, &dev_attr_name);
683         hwmon_device_unregister(hwmon->device);
684         kfree(hwmon);
685 }
686 #else
687 static int
688 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
689 {
690         return 0;
691 }
692
693 static void
694 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
695 {
696 }
697 #endif
698
699 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
700                                             int delay)
701 {
702         cancel_delayed_work(&(tz->poll_queue));
703
704         if (!delay)
705                 return;
706
707         if (delay > 1000)
708                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
709                                       round_jiffies(msecs_to_jiffies(delay)));
710         else
711                 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
712                                       msecs_to_jiffies(delay));
713 }
714
715 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
716                                         int temp, int trip_temp, int trip)
717 {
718         enum thermal_trend trend;
719         struct thermal_cooling_device_instance *instance;
720         struct thermal_cooling_device *cdev;
721         long state, max_state;
722
723         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
724                 /*
725                  * compare the current temperature and previous temperature
726                  * to get the thermal trend, if no special requirement
727                  */
728                 if (tz->temperature > tz->last_temperature)
729                         trend = THERMAL_TREND_RAISING;
730                 else if (tz->temperature < tz->last_temperature)
731                         trend = THERMAL_TREND_DROPPING;
732                 else
733                         trend = THERMAL_TREND_STABLE;
734         }
735
736         /*
737          * Above Trip?
738          * -----------
739          * Calculate the thermal trend (using the passive cooling equation)
740          * and modify the performance limit for all passive cooling devices
741          * accordingly.  Note that we assume symmetry.
742          */
743         if (temp >= trip_temp) {
744                 tz->passive = true;
745
746                 /* Heating up? */
747                 if (trend == THERMAL_TREND_RAISING) {
748                         list_for_each_entry(instance, &tz->cooling_devices,
749                                             node) {
750                                 if (instance->trip != trip)
751                                         continue;
752                                 cdev = instance->cdev;
753                                 cdev->ops->get_cur_state(cdev, &state);
754                                 cdev->ops->get_max_state(cdev, &max_state);
755                                 if (state++ < max_state)
756                                         cdev->ops->set_cur_state(cdev, state);
757                         }
758                 } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
759                         list_for_each_entry(instance, &tz->cooling_devices,
760                                             node) {
761                                 if (instance->trip != trip)
762                                         continue;
763                                 cdev = instance->cdev;
764                                 cdev->ops->get_cur_state(cdev, &state);
765                                 cdev->ops->get_max_state(cdev, &max_state);
766                                 if (state > 0)
767                                         cdev->ops->set_cur_state(cdev, --state);
768                         }
769                 }
770                 return;
771         }
772
773         /*
774          * Below Trip?
775          * -----------
776          * Implement passive cooling hysteresis to slowly increase performance
777          * and avoid thrashing around the passive trip point.  Note that we
778          * assume symmetry.
779          */
780         list_for_each_entry(instance, &tz->cooling_devices, node) {
781                 if (instance->trip != trip)
782                         continue;
783                 cdev = instance->cdev;
784                 cdev->ops->get_cur_state(cdev, &state);
785                 cdev->ops->get_max_state(cdev, &max_state);
786                 if (state > 0)
787                         cdev->ops->set_cur_state(cdev, --state);
788                 if (state == 0)
789                         tz->passive = false;
790         }
791 }
792
793 static void thermal_zone_device_check(struct work_struct *work)
794 {
795         struct thermal_zone_device *tz = container_of(work, struct
796                                                       thermal_zone_device,
797                                                       poll_queue.work);
798         thermal_zone_device_update(tz);
799 }
800
801 /**
802  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
803  * @tz:         thermal zone device
804  * @trip:       indicates which trip point the cooling devices is
805  *              associated with in this thermal zone.
806  * @cdev:       thermal cooling device
807  *
808  * This function is usually called in the thermal zone device .bind callback.
809  */
810 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
811                                      int trip,
812                                      struct thermal_cooling_device *cdev,
813                                      unsigned long upper, unsigned long lower)
814 {
815         struct thermal_cooling_device_instance *dev;
816         struct thermal_cooling_device_instance *pos;
817         struct thermal_zone_device *pos1;
818         struct thermal_cooling_device *pos2;
819         unsigned long max_state;
820         int result;
821
822         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
823                 return -EINVAL;
824
825         list_for_each_entry(pos1, &thermal_tz_list, node) {
826                 if (pos1 == tz)
827                         break;
828         }
829         list_for_each_entry(pos2, &thermal_cdev_list, node) {
830                 if (pos2 == cdev)
831                         break;
832         }
833
834         if (tz != pos1 || cdev != pos2)
835                 return -EINVAL;
836
837         cdev->ops->get_max_state(cdev, &max_state);
838
839         /* lower default 0, upper default max_state */
840         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
841         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
842
843         if (lower > upper || upper > max_state)
844                 return -EINVAL;
845
846         dev =
847             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
848         if (!dev)
849                 return -ENOMEM;
850         dev->tz = tz;
851         dev->cdev = cdev;
852         dev->trip = trip;
853         dev->upper = upper;
854         dev->lower = lower;
855
856         result = get_idr(&tz->idr, &tz->lock, &dev->id);
857         if (result)
858                 goto free_mem;
859
860         sprintf(dev->name, "cdev%d", dev->id);
861         result =
862             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
863         if (result)
864                 goto release_idr;
865
866         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
867         sysfs_attr_init(&dev->attr.attr);
868         dev->attr.attr.name = dev->attr_name;
869         dev->attr.attr.mode = 0444;
870         dev->attr.show = thermal_cooling_device_trip_point_show;
871         result = device_create_file(&tz->device, &dev->attr);
872         if (result)
873                 goto remove_symbol_link;
874
875         mutex_lock(&tz->lock);
876         list_for_each_entry(pos, &tz->cooling_devices, node)
877             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
878                 result = -EEXIST;
879                 break;
880         }
881         if (!result)
882                 list_add_tail(&dev->node, &tz->cooling_devices);
883         mutex_unlock(&tz->lock);
884
885         if (!result)
886                 return 0;
887
888         device_remove_file(&tz->device, &dev->attr);
889 remove_symbol_link:
890         sysfs_remove_link(&tz->device.kobj, dev->name);
891 release_idr:
892         release_idr(&tz->idr, &tz->lock, dev->id);
893 free_mem:
894         kfree(dev);
895         return result;
896 }
897 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
898
899 /**
900  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
901  * @tz:         thermal zone device
902  * @trip:       indicates which trip point the cooling devices is
903  *              associated with in this thermal zone.
904  * @cdev:       thermal cooling device
905  *
906  * This function is usually called in the thermal zone device .unbind callback.
907  */
908 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
909                                        int trip,
910                                        struct thermal_cooling_device *cdev)
911 {
912         struct thermal_cooling_device_instance *pos, *next;
913
914         mutex_lock(&tz->lock);
915         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
916                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
917                         list_del(&pos->node);
918                         mutex_unlock(&tz->lock);
919                         goto unbind;
920                 }
921         }
922         mutex_unlock(&tz->lock);
923
924         return -ENODEV;
925
926 unbind:
927         device_remove_file(&tz->device, &pos->attr);
928         sysfs_remove_link(&tz->device.kobj, pos->name);
929         release_idr(&tz->idr, &tz->lock, pos->id);
930         kfree(pos);
931         return 0;
932 }
933 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
934
935 static void thermal_release(struct device *dev)
936 {
937         struct thermal_zone_device *tz;
938         struct thermal_cooling_device *cdev;
939
940         if (!strncmp(dev_name(dev), "thermal_zone",
941                      sizeof("thermal_zone") - 1)) {
942                 tz = to_thermal_zone(dev);
943                 kfree(tz);
944         } else {
945                 cdev = to_cooling_device(dev);
946                 kfree(cdev);
947         }
948 }
949
950 static struct class thermal_class = {
951         .name = "thermal",
952         .dev_release = thermal_release,
953 };
954
955 /**
956  * thermal_cooling_device_register - register a new thermal cooling device
957  * @type:       the thermal cooling device type.
958  * @devdata:    device private data.
959  * @ops:                standard thermal cooling devices callbacks.
960  */
961 struct thermal_cooling_device *
962 thermal_cooling_device_register(char *type, void *devdata,
963                                 const struct thermal_cooling_device_ops *ops)
964 {
965         struct thermal_cooling_device *cdev;
966         struct thermal_zone_device *pos;
967         int result;
968
969         if (strlen(type) >= THERMAL_NAME_LENGTH)
970                 return ERR_PTR(-EINVAL);
971
972         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
973             !ops->set_cur_state)
974                 return ERR_PTR(-EINVAL);
975
976         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
977         if (!cdev)
978                 return ERR_PTR(-ENOMEM);
979
980         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
981         if (result) {
982                 kfree(cdev);
983                 return ERR_PTR(result);
984         }
985
986         strcpy(cdev->type, type);
987         cdev->ops = ops;
988         cdev->device.class = &thermal_class;
989         cdev->devdata = devdata;
990         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
991         result = device_register(&cdev->device);
992         if (result) {
993                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
994                 kfree(cdev);
995                 return ERR_PTR(result);
996         }
997
998         /* sys I/F */
999         if (type) {
1000                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1001                 if (result)
1002                         goto unregister;
1003         }
1004
1005         result = device_create_file(&cdev->device, &dev_attr_max_state);
1006         if (result)
1007                 goto unregister;
1008
1009         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1010         if (result)
1011                 goto unregister;
1012
1013         mutex_lock(&thermal_list_lock);
1014         list_add(&cdev->node, &thermal_cdev_list);
1015         list_for_each_entry(pos, &thermal_tz_list, node) {
1016                 if (!pos->ops->bind)
1017                         continue;
1018                 result = pos->ops->bind(pos, cdev);
1019                 if (result)
1020                         break;
1021
1022         }
1023         mutex_unlock(&thermal_list_lock);
1024
1025         if (!result)
1026                 return cdev;
1027
1028 unregister:
1029         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1030         device_unregister(&cdev->device);
1031         return ERR_PTR(result);
1032 }
1033 EXPORT_SYMBOL(thermal_cooling_device_register);
1034
1035 /**
1036  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1037  * @cdev:       the thermal cooling device to remove.
1038  *
1039  * thermal_cooling_device_unregister() must be called when the device is no
1040  * longer needed.
1041  */
1042 void thermal_cooling_device_unregister(struct
1043                                        thermal_cooling_device
1044                                        *cdev)
1045 {
1046         struct thermal_zone_device *tz;
1047         struct thermal_cooling_device *pos = NULL;
1048
1049         if (!cdev)
1050                 return;
1051
1052         mutex_lock(&thermal_list_lock);
1053         list_for_each_entry(pos, &thermal_cdev_list, node)
1054             if (pos == cdev)
1055                 break;
1056         if (pos != cdev) {
1057                 /* thermal cooling device not found */
1058                 mutex_unlock(&thermal_list_lock);
1059                 return;
1060         }
1061         list_del(&cdev->node);
1062         list_for_each_entry(tz, &thermal_tz_list, node) {
1063                 if (!tz->ops->unbind)
1064                         continue;
1065                 tz->ops->unbind(tz, cdev);
1066         }
1067         mutex_unlock(&thermal_list_lock);
1068         if (cdev->type[0])
1069                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1070         device_remove_file(&cdev->device, &dev_attr_max_state);
1071         device_remove_file(&cdev->device, &dev_attr_cur_state);
1072
1073         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1074         device_unregister(&cdev->device);
1075         return;
1076 }
1077 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1078
1079 /*
1080  * Cooling algorithm for active trip points
1081  *
1082  * 1. if the temperature is higher than a trip point,
1083  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
1084  *       state for this trip point
1085  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
1086  *       state for this trip point
1087  *
1088  * 2. if the temperature is lower than a trip point, use lower
1089  *    cooling state for this trip point
1090  *
1091  * Note that this behaves the same as the previous passive cooling
1092  * algorithm.
1093  */
1094
1095 static void thermal_zone_trip_update(struct thermal_zone_device *tz,
1096                                      int trip, long temp)
1097 {
1098         struct thermal_cooling_device_instance *instance;
1099         struct thermal_cooling_device *cdev = NULL;
1100         unsigned long cur_state, max_state;
1101         long trip_temp;
1102         enum thermal_trend trend;
1103
1104         tz->ops->get_trip_temp(tz, trip, &trip_temp);
1105
1106         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
1107                 /*
1108                  * compare the current temperature and previous temperature
1109                  * to get the thermal trend, if no special requirement
1110                  */
1111                 if (tz->temperature > tz->last_temperature)
1112                         trend = THERMAL_TREND_RAISING;
1113                 else if (tz->temperature < tz->last_temperature)
1114                         trend = THERMAL_TREND_DROPPING;
1115                 else
1116                         trend = THERMAL_TREND_STABLE;
1117         }
1118
1119         if (temp >= trip_temp) {
1120                 list_for_each_entry(instance, &tz->cooling_devices, node) {
1121                         if (instance->trip != trip)
1122                                 continue;
1123
1124                         cdev = instance->cdev;
1125
1126                         cdev->ops->get_cur_state(cdev, &cur_state);
1127                         cdev->ops->get_max_state(cdev, &max_state);
1128
1129                         if (trend == THERMAL_TREND_RAISING) {
1130                                 cur_state = cur_state < instance->upper ?
1131                                             (cur_state + 1) : instance->upper;
1132                         } else if (trend == THERMAL_TREND_DROPPING) {
1133                                 cur_state = cur_state > instance->lower ?
1134                                     (cur_state - 1) : instance->lower;
1135                         }
1136                         cdev->ops->set_cur_state(cdev, cur_state);
1137                 }
1138         } else {        /* below trip */
1139                 list_for_each_entry(instance, &tz->cooling_devices, node) {
1140                         if (instance->trip != trip)
1141                                 continue;
1142
1143                         cdev = instance->cdev;
1144                         cdev->ops->get_cur_state(cdev, &cur_state);
1145
1146                         cur_state = cur_state > instance->lower ?
1147                                     (cur_state - 1) : instance->lower;
1148                         cdev->ops->set_cur_state(cdev, cur_state);
1149                 }
1150         }
1151
1152         return;
1153 }
1154 /**
1155  * thermal_zone_device_update - force an update of a thermal zone's state
1156  * @ttz:        the thermal zone to update
1157  */
1158
1159 void thermal_zone_device_update(struct thermal_zone_device *tz)
1160 {
1161         int count, ret = 0;
1162         long temp, trip_temp;
1163         enum thermal_trip_type trip_type;
1164
1165         mutex_lock(&tz->lock);
1166
1167         if (tz->ops->get_temp(tz, &temp)) {
1168                 /* get_temp failed - retry it later */
1169                 pr_warn("failed to read out thermal zone %d\n", tz->id);
1170                 goto leave;
1171         }
1172
1173         tz->last_temperature = tz->temperature;
1174         tz->temperature = temp;
1175
1176         for (count = 0; count < tz->trips; count++) {
1177                 tz->ops->get_trip_type(tz, count, &trip_type);
1178                 tz->ops->get_trip_temp(tz, count, &trip_temp);
1179
1180                 switch (trip_type) {
1181                 case THERMAL_TRIP_CRITICAL:
1182                         if (temp >= trip_temp) {
1183                                 if (tz->ops->notify)
1184                                         ret = tz->ops->notify(tz, count,
1185                                                               trip_type);
1186                                 if (!ret) {
1187                                         pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1188                                                  temp/1000);
1189                                         orderly_poweroff(true);
1190                                 }
1191                         }
1192                         break;
1193                 case THERMAL_TRIP_HOT:
1194                         if (temp >= trip_temp)
1195                                 if (tz->ops->notify)
1196                                         tz->ops->notify(tz, count, trip_type);
1197                         break;
1198                 case THERMAL_TRIP_ACTIVE:
1199                         thermal_zone_trip_update(tz, count, temp);
1200                         break;
1201                 case THERMAL_TRIP_PASSIVE:
1202                         if (temp >= trip_temp || tz->passive)
1203                                 thermal_zone_device_passive(tz, temp,
1204                                                             trip_temp, count);
1205                         break;
1206                 }
1207         }
1208
1209         if (tz->forced_passive)
1210                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1211                                             THERMAL_TRIPS_NONE);
1212
1213 leave:
1214         if (tz->passive)
1215                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1216         else if (tz->polling_delay)
1217                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1218         else
1219                 thermal_zone_device_set_polling(tz, 0);
1220         mutex_unlock(&tz->lock);
1221 }
1222 EXPORT_SYMBOL(thermal_zone_device_update);
1223
1224 struct thermal_zone_device *thermal_zone_device_find(void *data,
1225         int (*match)(struct thermal_zone_device *, void *))
1226 {
1227         struct thermal_zone_device *thz;
1228
1229         mutex_lock(&thermal_list_lock);
1230         list_for_each_entry(thz, &thermal_tz_list, node)
1231                 if (match(thz, data)) {
1232                         mutex_unlock(&thermal_list_lock);
1233                         return thz;
1234                 }
1235
1236         mutex_unlock(&thermal_list_lock);
1237         return NULL;
1238 }
1239 EXPORT_SYMBOL(thermal_zone_device_find);
1240
1241 /**
1242  * create_trip_attrs - create attributes for trip points
1243  * @tz:         the thermal zone device
1244  * @mask:       Writeable trip point bitmap.
1245  */
1246 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1247 {
1248         int indx;
1249         int size = sizeof(struct thermal_attr) * tz->trips;
1250
1251         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1252         if (!tz->trip_type_attrs)
1253                 return -ENOMEM;
1254
1255         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1256         if (!tz->trip_temp_attrs) {
1257                 kfree(tz->trip_type_attrs);
1258                 return -ENOMEM;
1259         }
1260
1261         if (tz->ops->get_trip_hyst) {
1262                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1263                 if (!tz->trip_hyst_attrs) {
1264                         kfree(tz->trip_type_attrs);
1265                         kfree(tz->trip_temp_attrs);
1266                         return -ENOMEM;
1267                 }
1268         }
1269
1270
1271         for (indx = 0; indx < tz->trips; indx++) {
1272                 /* create trip type attribute */
1273                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1274                          "trip_point_%d_type", indx);
1275
1276                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1277                 tz->trip_type_attrs[indx].attr.attr.name =
1278                                                 tz->trip_type_attrs[indx].name;
1279                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1280                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1281
1282                 device_create_file(&tz->device,
1283                                    &tz->trip_type_attrs[indx].attr);
1284
1285                 /* create trip temp attribute */
1286                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1287                          "trip_point_%d_temp", indx);
1288
1289                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1290                 tz->trip_temp_attrs[indx].attr.attr.name =
1291                                                 tz->trip_temp_attrs[indx].name;
1292                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1293                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1294                 if (mask & (1 << indx)) {
1295                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1296                         tz->trip_temp_attrs[indx].attr.store =
1297                                                         trip_point_temp_store;
1298                 }
1299
1300                 device_create_file(&tz->device,
1301                                    &tz->trip_temp_attrs[indx].attr);
1302
1303                 /* create Optional trip hyst attribute */
1304                 if (!tz->ops->get_trip_hyst)
1305                         continue;
1306                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1307                          "trip_point_%d_hyst", indx);
1308
1309                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1310                 tz->trip_hyst_attrs[indx].attr.attr.name =
1311                                         tz->trip_hyst_attrs[indx].name;
1312                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1313                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1314                 if (tz->ops->set_trip_hyst) {
1315                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1316                         tz->trip_hyst_attrs[indx].attr.store =
1317                                         trip_point_hyst_store;
1318                 }
1319
1320                 device_create_file(&tz->device,
1321                                    &tz->trip_hyst_attrs[indx].attr);
1322         }
1323         return 0;
1324 }
1325
1326 static void remove_trip_attrs(struct thermal_zone_device *tz)
1327 {
1328         int indx;
1329
1330         for (indx = 0; indx < tz->trips; indx++) {
1331                 device_remove_file(&tz->device,
1332                                    &tz->trip_type_attrs[indx].attr);
1333                 device_remove_file(&tz->device,
1334                                    &tz->trip_temp_attrs[indx].attr);
1335                 if (tz->ops->get_trip_hyst)
1336                         device_remove_file(&tz->device,
1337                                   &tz->trip_hyst_attrs[indx].attr);
1338         }
1339         kfree(tz->trip_type_attrs);
1340         kfree(tz->trip_temp_attrs);
1341         kfree(tz->trip_hyst_attrs);
1342 }
1343
1344 /**
1345  * thermal_zone_device_register - register a new thermal zone device
1346  * @type:       the thermal zone device type
1347  * @trips:      the number of trip points the thermal zone support
1348  * @mask:       a bit string indicating the writeablility of trip points
1349  * @devdata:    private device data
1350  * @ops:        standard thermal zone device callbacks
1351  * @passive_delay: number of milliseconds to wait between polls when
1352  *                 performing passive cooling
1353  * @polling_delay: number of milliseconds to wait between polls when checking
1354  *                 whether trip points have been crossed (0 for interrupt
1355  *                 driven systems)
1356  *
1357  * thermal_zone_device_unregister() must be called when the device is no
1358  * longer needed. The passive cooling depends on the .get_trend() return value.
1359  */
1360 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1361         int trips, int mask, void *devdata,
1362         const struct thermal_zone_device_ops *ops,
1363         int passive_delay, int polling_delay)
1364 {
1365         struct thermal_zone_device *tz;
1366         struct thermal_cooling_device *pos;
1367         enum thermal_trip_type trip_type;
1368         int result;
1369         int count;
1370         int passive = 0;
1371
1372         if (strlen(type) >= THERMAL_NAME_LENGTH)
1373                 return ERR_PTR(-EINVAL);
1374
1375         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1376                 return ERR_PTR(-EINVAL);
1377
1378         if (!ops || !ops->get_temp)
1379                 return ERR_PTR(-EINVAL);
1380
1381         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1382         if (!tz)
1383                 return ERR_PTR(-ENOMEM);
1384
1385         INIT_LIST_HEAD(&tz->cooling_devices);
1386         idr_init(&tz->idr);
1387         mutex_init(&tz->lock);
1388         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1389         if (result) {
1390                 kfree(tz);
1391                 return ERR_PTR(result);
1392         }
1393
1394         strcpy(tz->type, type);
1395         tz->ops = ops;
1396         tz->device.class = &thermal_class;
1397         tz->devdata = devdata;
1398         tz->trips = trips;
1399         tz->passive_delay = passive_delay;
1400         tz->polling_delay = polling_delay;
1401
1402         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1403         result = device_register(&tz->device);
1404         if (result) {
1405                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1406                 kfree(tz);
1407                 return ERR_PTR(result);
1408         }
1409
1410         /* sys I/F */
1411         if (type) {
1412                 result = device_create_file(&tz->device, &dev_attr_type);
1413                 if (result)
1414                         goto unregister;
1415         }
1416
1417         result = device_create_file(&tz->device, &dev_attr_temp);
1418         if (result)
1419                 goto unregister;
1420
1421         if (ops->get_mode) {
1422                 result = device_create_file(&tz->device, &dev_attr_mode);
1423                 if (result)
1424                         goto unregister;
1425         }
1426
1427         result = create_trip_attrs(tz, mask);
1428         if (result)
1429                 goto unregister;
1430
1431         for (count = 0; count < trips; count++) {
1432                 tz->ops->get_trip_type(tz, count, &trip_type);
1433                 if (trip_type == THERMAL_TRIP_PASSIVE)
1434                         passive = 1;
1435         }
1436
1437         if (!passive)
1438                 result = device_create_file(&tz->device,
1439                                             &dev_attr_passive);
1440
1441         if (result)
1442                 goto unregister;
1443
1444         result = thermal_add_hwmon_sysfs(tz);
1445         if (result)
1446                 goto unregister;
1447
1448         mutex_lock(&thermal_list_lock);
1449         list_add_tail(&tz->node, &thermal_tz_list);
1450         if (ops->bind)
1451                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1452                 result = ops->bind(tz, pos);
1453                 if (result)
1454                         break;
1455                 }
1456         mutex_unlock(&thermal_list_lock);
1457
1458         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1459
1460         thermal_zone_device_update(tz);
1461
1462         if (!result)
1463                 return tz;
1464
1465 unregister:
1466         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1467         device_unregister(&tz->device);
1468         return ERR_PTR(result);
1469 }
1470 EXPORT_SYMBOL(thermal_zone_device_register);
1471
1472 /**
1473  * thermal_device_unregister - removes the registered thermal zone device
1474  * @tz: the thermal zone device to remove
1475  */
1476 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1477 {
1478         struct thermal_cooling_device *cdev;
1479         struct thermal_zone_device *pos = NULL;
1480
1481         if (!tz)
1482                 return;
1483
1484         mutex_lock(&thermal_list_lock);
1485         list_for_each_entry(pos, &thermal_tz_list, node)
1486             if (pos == tz)
1487                 break;
1488         if (pos != tz) {
1489                 /* thermal zone device not found */
1490                 mutex_unlock(&thermal_list_lock);
1491                 return;
1492         }
1493         list_del(&tz->node);
1494         if (tz->ops->unbind)
1495                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1496                     tz->ops->unbind(tz, cdev);
1497         mutex_unlock(&thermal_list_lock);
1498
1499         thermal_zone_device_set_polling(tz, 0);
1500
1501         if (tz->type[0])
1502                 device_remove_file(&tz->device, &dev_attr_type);
1503         device_remove_file(&tz->device, &dev_attr_temp);
1504         if (tz->ops->get_mode)
1505                 device_remove_file(&tz->device, &dev_attr_mode);
1506         remove_trip_attrs(tz);
1507
1508         thermal_remove_hwmon_sysfs(tz);
1509         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1510         idr_destroy(&tz->idr);
1511         mutex_destroy(&tz->lock);
1512         device_unregister(&tz->device);
1513         return;
1514 }
1515 EXPORT_SYMBOL(thermal_zone_device_unregister);
1516
1517 #ifdef CONFIG_NET
1518 static struct genl_family thermal_event_genl_family = {
1519         .id = GENL_ID_GENERATE,
1520         .name = THERMAL_GENL_FAMILY_NAME,
1521         .version = THERMAL_GENL_VERSION,
1522         .maxattr = THERMAL_GENL_ATTR_MAX,
1523 };
1524
1525 static struct genl_multicast_group thermal_event_mcgrp = {
1526         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1527 };
1528
1529 int thermal_generate_netlink_event(u32 orig, enum events event)
1530 {
1531         struct sk_buff *skb;
1532         struct nlattr *attr;
1533         struct thermal_genl_event *thermal_event;
1534         void *msg_header;
1535         int size;
1536         int result;
1537         static unsigned int thermal_event_seqnum;
1538
1539         /* allocate memory */
1540         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1541                nla_total_size(0);
1542
1543         skb = genlmsg_new(size, GFP_ATOMIC);
1544         if (!skb)
1545                 return -ENOMEM;
1546
1547         /* add the genetlink message header */
1548         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1549                                  &thermal_event_genl_family, 0,
1550                                  THERMAL_GENL_CMD_EVENT);
1551         if (!msg_header) {
1552                 nlmsg_free(skb);
1553                 return -ENOMEM;
1554         }
1555
1556         /* fill the data */
1557         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1558                            sizeof(struct thermal_genl_event));
1559
1560         if (!attr) {
1561                 nlmsg_free(skb);
1562                 return -EINVAL;
1563         }
1564
1565         thermal_event = nla_data(attr);
1566         if (!thermal_event) {
1567                 nlmsg_free(skb);
1568                 return -EINVAL;
1569         }
1570
1571         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1572
1573         thermal_event->orig = orig;
1574         thermal_event->event = event;
1575
1576         /* send multicast genetlink message */
1577         result = genlmsg_end(skb, msg_header);
1578         if (result < 0) {
1579                 nlmsg_free(skb);
1580                 return result;
1581         }
1582
1583         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1584         if (result)
1585                 pr_info("failed to send netlink event:%d\n", result);
1586
1587         return result;
1588 }
1589 EXPORT_SYMBOL(thermal_generate_netlink_event);
1590
1591 static int genetlink_init(void)
1592 {
1593         int result;
1594
1595         result = genl_register_family(&thermal_event_genl_family);
1596         if (result)
1597                 return result;
1598
1599         result = genl_register_mc_group(&thermal_event_genl_family,
1600                                         &thermal_event_mcgrp);
1601         if (result)
1602                 genl_unregister_family(&thermal_event_genl_family);
1603         return result;
1604 }
1605
1606 static void genetlink_exit(void)
1607 {
1608         genl_unregister_family(&thermal_event_genl_family);
1609 }
1610 #else /* !CONFIG_NET */
1611 static inline int genetlink_init(void) { return 0; }
1612 static inline void genetlink_exit(void) {}
1613 #endif /* !CONFIG_NET */
1614
1615 static int __init thermal_init(void)
1616 {
1617         int result = 0;
1618
1619         result = class_register(&thermal_class);
1620         if (result) {
1621                 idr_destroy(&thermal_tz_idr);
1622                 idr_destroy(&thermal_cdev_idr);
1623                 mutex_destroy(&thermal_idr_lock);
1624                 mutex_destroy(&thermal_list_lock);
1625         }
1626         result = genetlink_init();
1627         return result;
1628 }
1629
1630 static void __exit thermal_exit(void)
1631 {
1632         class_unregister(&thermal_class);
1633         idr_destroy(&thermal_tz_idr);
1634         idr_destroy(&thermal_cdev_idr);
1635         mutex_destroy(&thermal_idr_lock);
1636         mutex_destroy(&thermal_list_lock);
1637         genetlink_exit();
1638 }
1639
1640 fs_initcall(thermal_init);
1641 module_exit(thermal_exit);