b6353d61fac5944bc25cb4044c183fbab80027c7
[linux-2.6.git] / drivers / thermal / thermal_sys.c
1 /*
2  *  thermal.c - Generic Thermal Management Sysfs support.
3  *
4  *  Copyright (C) 2008 Intel Corp
5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7  *
8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License as published by
12  *  the Free Software Foundation; version 2 of the License.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/err.h>
29 #include <linux/slab.h>
30 #include <linux/kdev_t.h>
31 #include <linux/idr.h>
32 #include <linux/thermal.h>
33 #include <linux/spinlock.h>
34 #include <linux/reboot.h>
35 #include <net/netlink.h>
36 #include <net/genetlink.h>
37
38 MODULE_AUTHOR("Zhang Rui");
39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
40 MODULE_LICENSE("GPL");
41
42 #define PREFIX "Thermal: "
43
44 struct thermal_cooling_device_instance {
45         int id;
46         char name[THERMAL_NAME_LENGTH];
47         struct thermal_zone_device *tz;
48         struct thermal_cooling_device *cdev;
49         int trip;
50         char attr_name[THERMAL_NAME_LENGTH];
51         struct device_attribute attr;
52         struct list_head node;
53 };
54
55 static DEFINE_IDR(thermal_tz_idr);
56 static DEFINE_IDR(thermal_cdev_idr);
57 static DEFINE_MUTEX(thermal_idr_lock);
58
59 static LIST_HEAD(thermal_tz_list);
60 static LIST_HEAD(thermal_cdev_list);
61 static DEFINE_MUTEX(thermal_list_lock);
62
63 static unsigned int thermal_event_seqnum;
64
65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
66 {
67         int err;
68
69       again:
70         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
71                 return -ENOMEM;
72
73         if (lock)
74                 mutex_lock(lock);
75         err = idr_get_new(idr, NULL, id);
76         if (lock)
77                 mutex_unlock(lock);
78         if (unlikely(err == -EAGAIN))
79                 goto again;
80         else if (unlikely(err))
81                 return err;
82
83         *id = *id & MAX_ID_MASK;
84         return 0;
85 }
86
87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
88 {
89         if (lock)
90                 mutex_lock(lock);
91         idr_remove(idr, id);
92         if (lock)
93                 mutex_unlock(lock);
94 }
95
96 /* sys I/F for thermal zone */
97
98 #define to_thermal_zone(_dev) \
99         container_of(_dev, struct thermal_zone_device, device)
100
101 static ssize_t
102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
103 {
104         struct thermal_zone_device *tz = to_thermal_zone(dev);
105
106         return sprintf(buf, "%s\n", tz->type);
107 }
108
109 static ssize_t
110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
111 {
112         struct thermal_zone_device *tz = to_thermal_zone(dev);
113         long temperature;
114         int ret;
115
116         if (!tz->ops->get_temp)
117                 return -EPERM;
118
119         ret = tz->ops->get_temp(tz, &temperature);
120
121         if (ret)
122                 return ret;
123
124         return sprintf(buf, "%ld\n", temperature);
125 }
126
127 static ssize_t
128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
129 {
130         struct thermal_zone_device *tz = to_thermal_zone(dev);
131         enum thermal_device_mode mode;
132         int result;
133
134         if (!tz->ops->get_mode)
135                 return -EPERM;
136
137         result = tz->ops->get_mode(tz, &mode);
138         if (result)
139                 return result;
140
141         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
142                        : "disabled");
143 }
144
145 static ssize_t
146 mode_store(struct device *dev, struct device_attribute *attr,
147            const char *buf, size_t count)
148 {
149         struct thermal_zone_device *tz = to_thermal_zone(dev);
150         int result;
151
152         if (!tz->ops->set_mode)
153                 return -EPERM;
154
155         if (!strncmp(buf, "enabled", sizeof("enabled")))
156                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
157         else if (!strncmp(buf, "disabled", sizeof("disabled")))
158                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
159         else
160                 result = -EINVAL;
161
162         if (result)
163                 return result;
164
165         return count;
166 }
167
168 static ssize_t
169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
170                      char *buf)
171 {
172         struct thermal_zone_device *tz = to_thermal_zone(dev);
173         enum thermal_trip_type type;
174         int trip, result;
175
176         if (!tz->ops->get_trip_type)
177                 return -EPERM;
178
179         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
180                 return -EINVAL;
181
182         result = tz->ops->get_trip_type(tz, trip, &type);
183         if (result)
184                 return result;
185
186         switch (type) {
187         case THERMAL_TRIP_CRITICAL:
188                 return sprintf(buf, "critical\n");
189         case THERMAL_TRIP_HOT:
190                 return sprintf(buf, "hot\n");
191         case THERMAL_TRIP_PASSIVE:
192                 return sprintf(buf, "passive\n");
193         case THERMAL_TRIP_ACTIVE:
194                 return sprintf(buf, "active\n");
195         default:
196                 return sprintf(buf, "unknown\n");
197         }
198 }
199
200 static ssize_t
201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
202                      char *buf)
203 {
204         struct thermal_zone_device *tz = to_thermal_zone(dev);
205         int trip, ret;
206         long temperature;
207
208         if (!tz->ops->get_trip_temp)
209                 return -EPERM;
210
211         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
212                 return -EINVAL;
213
214         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
215
216         if (ret)
217                 return ret;
218
219         return sprintf(buf, "%ld\n", temperature);
220 }
221
222 static ssize_t
223 passive_store(struct device *dev, struct device_attribute *attr,
224                     const char *buf, size_t count)
225 {
226         struct thermal_zone_device *tz = to_thermal_zone(dev);
227         struct thermal_cooling_device *cdev = NULL;
228         int state;
229
230         if (!sscanf(buf, "%d\n", &state))
231                 return -EINVAL;
232
233         /* sanity check: values below 1000 millicelcius don't make sense
234          * and can cause the system to go into a thermal heart attack
235          */
236         if (state && state < 1000)
237                 return -EINVAL;
238
239         if (state && !tz->forced_passive) {
240                 mutex_lock(&thermal_list_lock);
241                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
242                         if (!strncmp("Processor", cdev->type,
243                                      sizeof("Processor")))
244                                 thermal_zone_bind_cooling_device(tz,
245                                                                  THERMAL_TRIPS_NONE,
246                                                                  cdev);
247                 }
248                 mutex_unlock(&thermal_list_lock);
249                 if (!tz->passive_delay)
250                         tz->passive_delay = 1000;
251         } else if (!state && tz->forced_passive) {
252                 mutex_lock(&thermal_list_lock);
253                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
254                         if (!strncmp("Processor", cdev->type,
255                                      sizeof("Processor")))
256                                 thermal_zone_unbind_cooling_device(tz,
257                                                                    THERMAL_TRIPS_NONE,
258                                                                    cdev);
259                 }
260                 mutex_unlock(&thermal_list_lock);
261                 tz->passive_delay = 0;
262         }
263
264         tz->tc1 = 1;
265         tz->tc2 = 1;
266
267         tz->forced_passive = state;
268
269         thermal_zone_device_update(tz);
270
271         return count;
272 }
273
274 static ssize_t
275 passive_show(struct device *dev, struct device_attribute *attr,
276                    char *buf)
277 {
278         struct thermal_zone_device *tz = to_thermal_zone(dev);
279
280         return sprintf(buf, "%d\n", tz->forced_passive);
281 }
282
283 static DEVICE_ATTR(type, 0444, type_show, NULL);
284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
287                    passive_store);
288
289 static struct device_attribute trip_point_attrs[] = {
290         __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
291         __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
292         __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
293         __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
294         __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
295         __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
296         __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
297         __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
298         __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
299         __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
300         __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
301         __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
302         __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
303         __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
304         __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
305         __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
306         __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
307         __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
308         __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
309         __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
310         __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
311         __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
312         __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
313         __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
314 };
315
316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result)     \
317 do {    \
318         result = device_create_file(_dev,       \
319                                 &trip_point_attrs[_index * 2]); \
320         if (result)     \
321                 break;  \
322         result = device_create_file(_dev,       \
323                         &trip_point_attrs[_index * 2 + 1]);     \
324 } while (0)
325
326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index)    \
327 do {    \
328         device_remove_file(_dev, &trip_point_attrs[_index * 2]);        \
329         device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);    \
330 } while (0)
331
332 /* sys I/F for cooling device */
333 #define to_cooling_device(_dev) \
334         container_of(_dev, struct thermal_cooling_device, device)
335
336 static ssize_t
337 thermal_cooling_device_type_show(struct device *dev,
338                                  struct device_attribute *attr, char *buf)
339 {
340         struct thermal_cooling_device *cdev = to_cooling_device(dev);
341
342         return sprintf(buf, "%s\n", cdev->type);
343 }
344
345 static ssize_t
346 thermal_cooling_device_max_state_show(struct device *dev,
347                                       struct device_attribute *attr, char *buf)
348 {
349         struct thermal_cooling_device *cdev = to_cooling_device(dev);
350         unsigned long state;
351         int ret;
352
353         ret = cdev->ops->get_max_state(cdev, &state);
354         if (ret)
355                 return ret;
356         return sprintf(buf, "%ld\n", state);
357 }
358
359 static ssize_t
360 thermal_cooling_device_cur_state_show(struct device *dev,
361                                       struct device_attribute *attr, char *buf)
362 {
363         struct thermal_cooling_device *cdev = to_cooling_device(dev);
364         unsigned long state;
365         int ret;
366
367         ret = cdev->ops->get_cur_state(cdev, &state);
368         if (ret)
369                 return ret;
370         return sprintf(buf, "%ld\n", state);
371 }
372
373 static ssize_t
374 thermal_cooling_device_cur_state_store(struct device *dev,
375                                        struct device_attribute *attr,
376                                        const char *buf, size_t count)
377 {
378         struct thermal_cooling_device *cdev = to_cooling_device(dev);
379         unsigned long state;
380         int result;
381
382         if (!sscanf(buf, "%ld\n", &state))
383                 return -EINVAL;
384
385         if ((long)state < 0)
386                 return -EINVAL;
387
388         result = cdev->ops->set_cur_state(cdev, state);
389         if (result)
390                 return result;
391         return count;
392 }
393
394 static struct device_attribute dev_attr_cdev_type =
395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
396 static DEVICE_ATTR(max_state, 0444,
397                    thermal_cooling_device_max_state_show, NULL);
398 static DEVICE_ATTR(cur_state, 0644,
399                    thermal_cooling_device_cur_state_show,
400                    thermal_cooling_device_cur_state_store);
401
402 static ssize_t
403 thermal_cooling_device_trip_point_show(struct device *dev,
404                                        struct device_attribute *attr, char *buf)
405 {
406         struct thermal_cooling_device_instance *instance;
407
408         instance =
409             container_of(attr, struct thermal_cooling_device_instance, attr);
410
411         if (instance->trip == THERMAL_TRIPS_NONE)
412                 return sprintf(buf, "-1\n");
413         else
414                 return sprintf(buf, "%d\n", instance->trip);
415 }
416
417 /* Device management */
418
419 #if defined(CONFIG_THERMAL_HWMON)
420
421 /* hwmon sys I/F */
422 #include <linux/hwmon.h>
423 static LIST_HEAD(thermal_hwmon_list);
424
425 static ssize_t
426 name_show(struct device *dev, struct device_attribute *attr, char *buf)
427 {
428         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
429         return sprintf(buf, "%s\n", hwmon->type);
430 }
431 static DEVICE_ATTR(name, 0444, name_show, NULL);
432
433 static ssize_t
434 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
435 {
436         long temperature;
437         int ret;
438         struct thermal_hwmon_attr *hwmon_attr
439                         = container_of(attr, struct thermal_hwmon_attr, attr);
440         struct thermal_zone_device *tz
441                         = container_of(hwmon_attr, struct thermal_zone_device,
442                                        temp_input);
443
444         ret = tz->ops->get_temp(tz, &temperature);
445
446         if (ret)
447                 return ret;
448
449         return sprintf(buf, "%ld\n", temperature);
450 }
451
452 static ssize_t
453 temp_crit_show(struct device *dev, struct device_attribute *attr,
454                 char *buf)
455 {
456         struct thermal_hwmon_attr *hwmon_attr
457                         = container_of(attr, struct thermal_hwmon_attr, attr);
458         struct thermal_zone_device *tz
459                         = container_of(hwmon_attr, struct thermal_zone_device,
460                                        temp_crit);
461         long temperature;
462         int ret;
463
464         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
465         if (ret)
466                 return ret;
467
468         return sprintf(buf, "%ld\n", temperature);
469 }
470
471
472 static struct thermal_hwmon_device *
473 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
474 {
475         struct thermal_hwmon_device *hwmon;
476
477         mutex_lock(&thermal_list_lock);
478         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
479                 if (!strcmp(hwmon->type, tz->type)) {
480                         mutex_unlock(&thermal_list_lock);
481                         return hwmon;
482                 }
483         mutex_unlock(&thermal_list_lock);
484
485         return NULL;
486 }
487
488 static int
489 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
490 {
491         struct thermal_hwmon_device *hwmon;
492         int new_hwmon_device = 1;
493         int result;
494
495         hwmon = thermal_hwmon_lookup_by_type(tz);
496         if (hwmon) {
497                 new_hwmon_device = 0;
498                 goto register_sys_interface;
499         }
500
501         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
502         if (!hwmon)
503                 return -ENOMEM;
504
505         INIT_LIST_HEAD(&hwmon->tz_list);
506         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
507         hwmon->device = hwmon_device_register(NULL);
508         if (IS_ERR(hwmon->device)) {
509                 result = PTR_ERR(hwmon->device);
510                 goto free_mem;
511         }
512         dev_set_drvdata(hwmon->device, hwmon);
513         result = device_create_file(hwmon->device, &dev_attr_name);
514         if (result)
515                 goto free_mem;
516
517  register_sys_interface:
518         tz->hwmon = hwmon;
519         hwmon->count++;
520
521         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
522                  "temp%d_input", hwmon->count);
523         tz->temp_input.attr.attr.name = tz->temp_input.name;
524         tz->temp_input.attr.attr.mode = 0444;
525         tz->temp_input.attr.show = temp_input_show;
526         sysfs_attr_init(&tz->temp_input.attr.attr);
527         result = device_create_file(hwmon->device, &tz->temp_input.attr);
528         if (result)
529                 goto unregister_name;
530
531         if (tz->ops->get_crit_temp) {
532                 unsigned long temperature;
533                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
534                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
535                                 "temp%d_crit", hwmon->count);
536                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
537                         tz->temp_crit.attr.attr.mode = 0444;
538                         tz->temp_crit.attr.show = temp_crit_show;
539                         sysfs_attr_init(&tz->temp_crit.attr.attr);
540                         result = device_create_file(hwmon->device,
541                                                     &tz->temp_crit.attr);
542                         if (result)
543                                 goto unregister_input;
544                 }
545         }
546
547         mutex_lock(&thermal_list_lock);
548         if (new_hwmon_device)
549                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
550         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
551         mutex_unlock(&thermal_list_lock);
552
553         return 0;
554
555  unregister_input:
556         device_remove_file(hwmon->device, &tz->temp_input.attr);
557  unregister_name:
558         if (new_hwmon_device) {
559                 device_remove_file(hwmon->device, &dev_attr_name);
560                 hwmon_device_unregister(hwmon->device);
561         }
562  free_mem:
563         if (new_hwmon_device)
564                 kfree(hwmon);
565
566         return result;
567 }
568
569 static void
570 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
571 {
572         struct thermal_hwmon_device *hwmon = tz->hwmon;
573
574         tz->hwmon = NULL;
575         device_remove_file(hwmon->device, &tz->temp_input.attr);
576         if (tz->ops->get_crit_temp)
577                 device_remove_file(hwmon->device, &tz->temp_crit.attr);
578
579         mutex_lock(&thermal_list_lock);
580         list_del(&tz->hwmon_node);
581         if (!list_empty(&hwmon->tz_list)) {
582                 mutex_unlock(&thermal_list_lock);
583                 return;
584         }
585         list_del(&hwmon->node);
586         mutex_unlock(&thermal_list_lock);
587
588         device_remove_file(hwmon->device, &dev_attr_name);
589         hwmon_device_unregister(hwmon->device);
590         kfree(hwmon);
591 }
592 #else
593 static int
594 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
595 {
596         return 0;
597 }
598
599 static void
600 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
601 {
602 }
603 #endif
604
605 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
606                                             int delay)
607 {
608         cancel_delayed_work(&(tz->poll_queue));
609
610         if (!delay)
611                 return;
612
613         if (delay > 1000)
614                 schedule_delayed_work(&(tz->poll_queue),
615                                       round_jiffies(msecs_to_jiffies(delay)));
616         else
617                 schedule_delayed_work(&(tz->poll_queue),
618                                       msecs_to_jiffies(delay));
619 }
620
621 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
622                                         int temp, int trip_temp, int trip)
623 {
624         int trend = 0;
625         struct thermal_cooling_device_instance *instance;
626         struct thermal_cooling_device *cdev;
627         long state, max_state;
628
629         /*
630          * Above Trip?
631          * -----------
632          * Calculate the thermal trend (using the passive cooling equation)
633          * and modify the performance limit for all passive cooling devices
634          * accordingly.  Note that we assume symmetry.
635          */
636         if (temp >= trip_temp) {
637                 tz->passive = true;
638
639                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
640                         (tz->tc2 * (temp - trip_temp));
641
642                 /* Heating up? */
643                 if (trend > 0) {
644                         list_for_each_entry(instance, &tz->cooling_devices,
645                                             node) {
646                                 if (instance->trip != trip)
647                                         continue;
648                                 cdev = instance->cdev;
649                                 cdev->ops->get_cur_state(cdev, &state);
650                                 cdev->ops->get_max_state(cdev, &max_state);
651                                 if (state++ < max_state)
652                                         cdev->ops->set_cur_state(cdev, state);
653                         }
654                 } else if (trend < 0) { /* Cooling off? */
655                         list_for_each_entry(instance, &tz->cooling_devices,
656                                             node) {
657                                 if (instance->trip != trip)
658                                         continue;
659                                 cdev = instance->cdev;
660                                 cdev->ops->get_cur_state(cdev, &state);
661                                 cdev->ops->get_max_state(cdev, &max_state);
662                                 if (state > 0)
663                                         cdev->ops->set_cur_state(cdev, --state);
664                         }
665                 }
666                 return;
667         }
668
669         /*
670          * Below Trip?
671          * -----------
672          * Implement passive cooling hysteresis to slowly increase performance
673          * and avoid thrashing around the passive trip point.  Note that we
674          * assume symmetry.
675          */
676         list_for_each_entry(instance, &tz->cooling_devices, node) {
677                 if (instance->trip != trip)
678                         continue;
679                 cdev = instance->cdev;
680                 cdev->ops->get_cur_state(cdev, &state);
681                 cdev->ops->get_max_state(cdev, &max_state);
682                 if (state > 0)
683                         cdev->ops->set_cur_state(cdev, --state);
684                 if (state == 0)
685                         tz->passive = false;
686         }
687 }
688
689 static void thermal_zone_device_check(struct work_struct *work)
690 {
691         struct thermal_zone_device *tz = container_of(work, struct
692                                                       thermal_zone_device,
693                                                       poll_queue.work);
694         thermal_zone_device_update(tz);
695 }
696
697 /**
698  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
699  * @tz:         thermal zone device
700  * @trip:       indicates which trip point the cooling devices is
701  *              associated with in this thermal zone.
702  * @cdev:       thermal cooling device
703  *
704  * This function is usually called in the thermal zone device .bind callback.
705  */
706 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
707                                      int trip,
708                                      struct thermal_cooling_device *cdev)
709 {
710         struct thermal_cooling_device_instance *dev;
711         struct thermal_cooling_device_instance *pos;
712         struct thermal_zone_device *pos1;
713         struct thermal_cooling_device *pos2;
714         int result;
715
716         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
717                 return -EINVAL;
718
719         list_for_each_entry(pos1, &thermal_tz_list, node) {
720                 if (pos1 == tz)
721                         break;
722         }
723         list_for_each_entry(pos2, &thermal_cdev_list, node) {
724                 if (pos2 == cdev)
725                         break;
726         }
727
728         if (tz != pos1 || cdev != pos2)
729                 return -EINVAL;
730
731         dev =
732             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
733         if (!dev)
734                 return -ENOMEM;
735         dev->tz = tz;
736         dev->cdev = cdev;
737         dev->trip = trip;
738         result = get_idr(&tz->idr, &tz->lock, &dev->id);
739         if (result)
740                 goto free_mem;
741
742         sprintf(dev->name, "cdev%d", dev->id);
743         result =
744             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
745         if (result)
746                 goto release_idr;
747
748         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
749         sysfs_attr_init(&dev->attr.attr);
750         dev->attr.attr.name = dev->attr_name;
751         dev->attr.attr.mode = 0444;
752         dev->attr.show = thermal_cooling_device_trip_point_show;
753         result = device_create_file(&tz->device, &dev->attr);
754         if (result)
755                 goto remove_symbol_link;
756
757         mutex_lock(&tz->lock);
758         list_for_each_entry(pos, &tz->cooling_devices, node)
759             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
760                 result = -EEXIST;
761                 break;
762         }
763         if (!result)
764                 list_add_tail(&dev->node, &tz->cooling_devices);
765         mutex_unlock(&tz->lock);
766
767         if (!result)
768                 return 0;
769
770         device_remove_file(&tz->device, &dev->attr);
771       remove_symbol_link:
772         sysfs_remove_link(&tz->device.kobj, dev->name);
773       release_idr:
774         release_idr(&tz->idr, &tz->lock, dev->id);
775       free_mem:
776         kfree(dev);
777         return result;
778 }
779
780 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
781
782 /**
783  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
784  * @tz:         thermal zone device
785  * @trip:       indicates which trip point the cooling devices is
786  *              associated with in this thermal zone.
787  * @cdev:       thermal cooling device
788  *
789  * This function is usually called in the thermal zone device .unbind callback.
790  */
791 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
792                                        int trip,
793                                        struct thermal_cooling_device *cdev)
794 {
795         struct thermal_cooling_device_instance *pos, *next;
796
797         mutex_lock(&tz->lock);
798         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
799                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
800                         list_del(&pos->node);
801                         mutex_unlock(&tz->lock);
802                         goto unbind;
803                 }
804         }
805         mutex_unlock(&tz->lock);
806
807         return -ENODEV;
808
809       unbind:
810         device_remove_file(&tz->device, &pos->attr);
811         sysfs_remove_link(&tz->device.kobj, pos->name);
812         release_idr(&tz->idr, &tz->lock, pos->id);
813         kfree(pos);
814         return 0;
815 }
816
817 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
818
819 static void thermal_release(struct device *dev)
820 {
821         struct thermal_zone_device *tz;
822         struct thermal_cooling_device *cdev;
823
824         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
825                 tz = to_thermal_zone(dev);
826                 kfree(tz);
827         } else {
828                 cdev = to_cooling_device(dev);
829                 kfree(cdev);
830         }
831 }
832
833 static struct class thermal_class = {
834         .name = "thermal",
835         .dev_release = thermal_release,
836 };
837
838 /**
839  * thermal_cooling_device_register - register a new thermal cooling device
840  * @type:       the thermal cooling device type.
841  * @devdata:    device private data.
842  * @ops:                standard thermal cooling devices callbacks.
843  */
844 struct thermal_cooling_device *thermal_cooling_device_register(
845      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
846 {
847         struct thermal_cooling_device *cdev;
848         struct thermal_zone_device *pos;
849         int result;
850
851         if (strlen(type) >= THERMAL_NAME_LENGTH)
852                 return ERR_PTR(-EINVAL);
853
854         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
855             !ops->set_cur_state)
856                 return ERR_PTR(-EINVAL);
857
858         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
859         if (!cdev)
860                 return ERR_PTR(-ENOMEM);
861
862         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
863         if (result) {
864                 kfree(cdev);
865                 return ERR_PTR(result);
866         }
867
868         strcpy(cdev->type, type);
869         cdev->ops = ops;
870         cdev->device.class = &thermal_class;
871         cdev->devdata = devdata;
872         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
873         result = device_register(&cdev->device);
874         if (result) {
875                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
876                 kfree(cdev);
877                 return ERR_PTR(result);
878         }
879
880         /* sys I/F */
881         if (type) {
882                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
883                 if (result)
884                         goto unregister;
885         }
886
887         result = device_create_file(&cdev->device, &dev_attr_max_state);
888         if (result)
889                 goto unregister;
890
891         result = device_create_file(&cdev->device, &dev_attr_cur_state);
892         if (result)
893                 goto unregister;
894
895         mutex_lock(&thermal_list_lock);
896         list_add(&cdev->node, &thermal_cdev_list);
897         list_for_each_entry(pos, &thermal_tz_list, node) {
898                 if (!pos->ops->bind)
899                         continue;
900                 result = pos->ops->bind(pos, cdev);
901                 if (result)
902                         break;
903
904         }
905         mutex_unlock(&thermal_list_lock);
906
907         if (!result)
908                 return cdev;
909
910       unregister:
911         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
912         device_unregister(&cdev->device);
913         return ERR_PTR(result);
914 }
915
916 EXPORT_SYMBOL(thermal_cooling_device_register);
917
918 /**
919  * thermal_cooling_device_unregister - removes the registered thermal cooling device
920  * @cdev:       the thermal cooling device to remove.
921  *
922  * thermal_cooling_device_unregister() must be called when the device is no
923  * longer needed.
924  */
925 void thermal_cooling_device_unregister(struct
926                                        thermal_cooling_device
927                                        *cdev)
928 {
929         struct thermal_zone_device *tz;
930         struct thermal_cooling_device *pos = NULL;
931
932         if (!cdev)
933                 return;
934
935         mutex_lock(&thermal_list_lock);
936         list_for_each_entry(pos, &thermal_cdev_list, node)
937             if (pos == cdev)
938                 break;
939         if (pos != cdev) {
940                 /* thermal cooling device not found */
941                 mutex_unlock(&thermal_list_lock);
942                 return;
943         }
944         list_del(&cdev->node);
945         list_for_each_entry(tz, &thermal_tz_list, node) {
946                 if (!tz->ops->unbind)
947                         continue;
948                 tz->ops->unbind(tz, cdev);
949         }
950         mutex_unlock(&thermal_list_lock);
951         if (cdev->type[0])
952                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
953         device_remove_file(&cdev->device, &dev_attr_max_state);
954         device_remove_file(&cdev->device, &dev_attr_cur_state);
955
956         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
957         device_unregister(&cdev->device);
958         return;
959 }
960
961 EXPORT_SYMBOL(thermal_cooling_device_unregister);
962
963 /**
964  * thermal_zone_device_update - force an update of a thermal zone's state
965  * @ttz:        the thermal zone to update
966  */
967
968 void thermal_zone_device_update(struct thermal_zone_device *tz)
969 {
970         int count, ret = 0;
971         long temp, trip_temp;
972         enum thermal_trip_type trip_type;
973         struct thermal_cooling_device_instance *instance;
974         struct thermal_cooling_device *cdev;
975
976         mutex_lock(&tz->lock);
977
978         if (tz->ops->get_temp(tz, &temp)) {
979                 /* get_temp failed - retry it later */
980                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
981                        "%d\n", tz->id);
982                 goto leave;
983         }
984
985         for (count = 0; count < tz->trips; count++) {
986                 tz->ops->get_trip_type(tz, count, &trip_type);
987                 tz->ops->get_trip_temp(tz, count, &trip_temp);
988
989                 switch (trip_type) {
990                 case THERMAL_TRIP_CRITICAL:
991                         if (temp >= trip_temp) {
992                                 if (tz->ops->notify)
993                                         ret = tz->ops->notify(tz, count,
994                                                               trip_type);
995                                 if (!ret) {
996                                         printk(KERN_EMERG
997                                                "Critical temperature reached (%ld C), shutting down.\n",
998                                                temp/1000);
999                                         orderly_poweroff(true);
1000                                 }
1001                         }
1002                         break;
1003                 case THERMAL_TRIP_HOT:
1004                         if (temp >= trip_temp)
1005                                 if (tz->ops->notify)
1006                                         tz->ops->notify(tz, count, trip_type);
1007                         break;
1008                 case THERMAL_TRIP_ACTIVE:
1009                         list_for_each_entry(instance, &tz->cooling_devices,
1010                                             node) {
1011                                 if (instance->trip != count)
1012                                         continue;
1013
1014                                 cdev = instance->cdev;
1015
1016                                 if (temp >= trip_temp)
1017                                         cdev->ops->set_cur_state(cdev, 1);
1018                                 else
1019                                         cdev->ops->set_cur_state(cdev, 0);
1020                         }
1021                         break;
1022                 case THERMAL_TRIP_PASSIVE:
1023                         if (temp >= trip_temp || tz->passive)
1024                                 thermal_zone_device_passive(tz, temp,
1025                                                             trip_temp, count);
1026                         break;
1027                 }
1028         }
1029
1030         if (tz->forced_passive)
1031                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1032                                             THERMAL_TRIPS_NONE);
1033
1034         tz->last_temperature = temp;
1035
1036       leave:
1037         if (tz->passive)
1038                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1039         else if (tz->polling_delay)
1040                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1041         else
1042                 thermal_zone_device_set_polling(tz, 0);
1043         mutex_unlock(&tz->lock);
1044 }
1045 EXPORT_SYMBOL(thermal_zone_device_update);
1046
1047 /**
1048  * thermal_zone_device_register - register a new thermal zone device
1049  * @type:       the thermal zone device type
1050  * @trips:      the number of trip points the thermal zone support
1051  * @devdata:    private device data
1052  * @ops:        standard thermal zone device callbacks
1053  * @tc1:        thermal coefficient 1 for passive calculations
1054  * @tc2:        thermal coefficient 2 for passive calculations
1055  * @passive_delay: number of milliseconds to wait between polls when
1056  *                 performing passive cooling
1057  * @polling_delay: number of milliseconds to wait between polls when checking
1058  *                 whether trip points have been crossed (0 for interrupt
1059  *                 driven systems)
1060  *
1061  * thermal_zone_device_unregister() must be called when the device is no
1062  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1063  * section 11.1.5.1 of the ACPI specification 3.0.
1064  */
1065 struct thermal_zone_device *thermal_zone_device_register(char *type,
1066         int trips, void *devdata,
1067         const struct thermal_zone_device_ops *ops,
1068         int tc1, int tc2, int passive_delay, int polling_delay)
1069 {
1070         struct thermal_zone_device *tz;
1071         struct thermal_cooling_device *pos;
1072         enum thermal_trip_type trip_type;
1073         int result;
1074         int count;
1075         int passive = 0;
1076
1077         if (strlen(type) >= THERMAL_NAME_LENGTH)
1078                 return ERR_PTR(-EINVAL);
1079
1080         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1081                 return ERR_PTR(-EINVAL);
1082
1083         if (!ops || !ops->get_temp)
1084                 return ERR_PTR(-EINVAL);
1085
1086         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1087         if (!tz)
1088                 return ERR_PTR(-ENOMEM);
1089
1090         INIT_LIST_HEAD(&tz->cooling_devices);
1091         idr_init(&tz->idr);
1092         mutex_init(&tz->lock);
1093         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1094         if (result) {
1095                 kfree(tz);
1096                 return ERR_PTR(result);
1097         }
1098
1099         strcpy(tz->type, type);
1100         tz->ops = ops;
1101         tz->device.class = &thermal_class;
1102         tz->devdata = devdata;
1103         tz->trips = trips;
1104         tz->tc1 = tc1;
1105         tz->tc2 = tc2;
1106         tz->passive_delay = passive_delay;
1107         tz->polling_delay = polling_delay;
1108
1109         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1110         result = device_register(&tz->device);
1111         if (result) {
1112                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1113                 kfree(tz);
1114                 return ERR_PTR(result);
1115         }
1116
1117         /* sys I/F */
1118         if (type) {
1119                 result = device_create_file(&tz->device, &dev_attr_type);
1120                 if (result)
1121                         goto unregister;
1122         }
1123
1124         result = device_create_file(&tz->device, &dev_attr_temp);
1125         if (result)
1126                 goto unregister;
1127
1128         if (ops->get_mode) {
1129                 result = device_create_file(&tz->device, &dev_attr_mode);
1130                 if (result)
1131                         goto unregister;
1132         }
1133
1134         for (count = 0; count < trips; count++) {
1135                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1136                 if (result)
1137                         goto unregister;
1138                 tz->ops->get_trip_type(tz, count, &trip_type);
1139                 if (trip_type == THERMAL_TRIP_PASSIVE)
1140                         passive = 1;
1141         }
1142
1143         if (!passive)
1144                 result = device_create_file(&tz->device,
1145                                             &dev_attr_passive);
1146
1147         if (result)
1148                 goto unregister;
1149
1150         result = thermal_add_hwmon_sysfs(tz);
1151         if (result)
1152                 goto unregister;
1153
1154         mutex_lock(&thermal_list_lock);
1155         list_add_tail(&tz->node, &thermal_tz_list);
1156         if (ops->bind)
1157                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1158                 result = ops->bind(tz, pos);
1159                 if (result)
1160                         break;
1161                 }
1162         mutex_unlock(&thermal_list_lock);
1163
1164         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1165
1166         thermal_zone_device_update(tz);
1167
1168         if (!result)
1169                 return tz;
1170
1171       unregister:
1172         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1173         device_unregister(&tz->device);
1174         return ERR_PTR(result);
1175 }
1176
1177 EXPORT_SYMBOL(thermal_zone_device_register);
1178
1179 /**
1180  * thermal_device_unregister - removes the registered thermal zone device
1181  * @tz: the thermal zone device to remove
1182  */
1183 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1184 {
1185         struct thermal_cooling_device *cdev;
1186         struct thermal_zone_device *pos = NULL;
1187         int count;
1188
1189         if (!tz)
1190                 return;
1191
1192         mutex_lock(&thermal_list_lock);
1193         list_for_each_entry(pos, &thermal_tz_list, node)
1194             if (pos == tz)
1195                 break;
1196         if (pos != tz) {
1197                 /* thermal zone device not found */
1198                 mutex_unlock(&thermal_list_lock);
1199                 return;
1200         }
1201         list_del(&tz->node);
1202         if (tz->ops->unbind)
1203                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1204                     tz->ops->unbind(tz, cdev);
1205         mutex_unlock(&thermal_list_lock);
1206
1207         thermal_zone_device_set_polling(tz, 0);
1208
1209         if (tz->type[0])
1210                 device_remove_file(&tz->device, &dev_attr_type);
1211         device_remove_file(&tz->device, &dev_attr_temp);
1212         if (tz->ops->get_mode)
1213                 device_remove_file(&tz->device, &dev_attr_mode);
1214
1215         for (count = 0; count < tz->trips; count++)
1216                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1217
1218         thermal_remove_hwmon_sysfs(tz);
1219         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1220         idr_destroy(&tz->idr);
1221         mutex_destroy(&tz->lock);
1222         device_unregister(&tz->device);
1223         return;
1224 }
1225
1226 EXPORT_SYMBOL(thermal_zone_device_unregister);
1227
1228 #ifdef CONFIG_NET
1229 static struct genl_family thermal_event_genl_family = {
1230         .id = GENL_ID_GENERATE,
1231         .name = THERMAL_GENL_FAMILY_NAME,
1232         .version = THERMAL_GENL_VERSION,
1233         .maxattr = THERMAL_GENL_ATTR_MAX,
1234 };
1235
1236 static struct genl_multicast_group thermal_event_mcgrp = {
1237         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1238 };
1239
1240 int generate_netlink_event(u32 orig, enum events event)
1241 {
1242         struct sk_buff *skb;
1243         struct nlattr *attr;
1244         struct thermal_genl_event *thermal_event;
1245         void *msg_header;
1246         int size;
1247         int result;
1248
1249         /* allocate memory */
1250         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1251                                 nla_total_size(0);
1252
1253         skb = genlmsg_new(size, GFP_ATOMIC);
1254         if (!skb)
1255                 return -ENOMEM;
1256
1257         /* add the genetlink message header */
1258         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1259                                  &thermal_event_genl_family, 0,
1260                                  THERMAL_GENL_CMD_EVENT);
1261         if (!msg_header) {
1262                 nlmsg_free(skb);
1263                 return -ENOMEM;
1264         }
1265
1266         /* fill the data */
1267         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1268                         sizeof(struct thermal_genl_event));
1269
1270         if (!attr) {
1271                 nlmsg_free(skb);
1272                 return -EINVAL;
1273         }
1274
1275         thermal_event = nla_data(attr);
1276         if (!thermal_event) {
1277                 nlmsg_free(skb);
1278                 return -EINVAL;
1279         }
1280
1281         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1282
1283         thermal_event->orig = orig;
1284         thermal_event->event = event;
1285
1286         /* send multicast genetlink message */
1287         result = genlmsg_end(skb, msg_header);
1288         if (result < 0) {
1289                 nlmsg_free(skb);
1290                 return result;
1291         }
1292
1293         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1294         if (result)
1295                 printk(KERN_INFO "failed to send netlink event:%d", result);
1296
1297         return result;
1298 }
1299 EXPORT_SYMBOL(generate_netlink_event);
1300
1301 static int genetlink_init(void)
1302 {
1303         int result;
1304
1305         result = genl_register_family(&thermal_event_genl_family);
1306         if (result)
1307                 return result;
1308
1309         result = genl_register_mc_group(&thermal_event_genl_family,
1310                                         &thermal_event_mcgrp);
1311         if (result)
1312                 genl_unregister_family(&thermal_event_genl_family);
1313         return result;
1314 }
1315
1316 static void genetlink_exit(void)
1317 {
1318         genl_unregister_family(&thermal_event_genl_family);
1319 }
1320 #else /* !CONFIG_NET */
1321 static inline int genetlink_init(void) { return 0; }
1322 static inline void genetlink_exit(void) {}
1323 #endif /* !CONFIG_NET */
1324
1325 static int __init thermal_init(void)
1326 {
1327         int result = 0;
1328
1329         result = class_register(&thermal_class);
1330         if (result) {
1331                 idr_destroy(&thermal_tz_idr);
1332                 idr_destroy(&thermal_cdev_idr);
1333                 mutex_destroy(&thermal_idr_lock);
1334                 mutex_destroy(&thermal_list_lock);
1335         }
1336         result = genetlink_init();
1337         return result;
1338 }
1339
1340 static void __exit thermal_exit(void)
1341 {
1342         class_unregister(&thermal_class);
1343         idr_destroy(&thermal_tz_idr);
1344         idr_destroy(&thermal_cdev_idr);
1345         mutex_destroy(&thermal_idr_lock);
1346         mutex_destroy(&thermal_list_lock);
1347         genetlink_exit();
1348 }
1349
1350 fs_initcall(thermal_init);
1351 module_exit(thermal_exit);