Thermal_Framework-Fix_crash_during_hwmon_unregister
[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 int
473 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
474 {
475         struct thermal_hwmon_device *hwmon;
476         int new_hwmon_device = 1;
477         int result;
478
479         mutex_lock(&thermal_list_lock);
480         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
481                 if (!strcmp(hwmon->type, tz->type)) {
482                         new_hwmon_device = 0;
483                         mutex_unlock(&thermal_list_lock);
484                         goto register_sys_interface;
485                 }
486         mutex_unlock(&thermal_list_lock);
487
488         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
489         if (!hwmon)
490                 return -ENOMEM;
491
492         INIT_LIST_HEAD(&hwmon->tz_list);
493         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
494         hwmon->device = hwmon_device_register(NULL);
495         if (IS_ERR(hwmon->device)) {
496                 result = PTR_ERR(hwmon->device);
497                 goto free_mem;
498         }
499         dev_set_drvdata(hwmon->device, hwmon);
500         result = device_create_file(hwmon->device, &dev_attr_name);
501         if (result)
502                 goto unregister_hwmon_device;
503
504  register_sys_interface:
505         tz->hwmon = hwmon;
506         hwmon->count++;
507
508         snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
509                  "temp%d_input", hwmon->count);
510         tz->temp_input.attr.attr.name = tz->temp_input.name;
511         tz->temp_input.attr.attr.mode = 0444;
512         tz->temp_input.attr.show = temp_input_show;
513         sysfs_attr_init(&tz->temp_input.attr.attr);
514         result = device_create_file(hwmon->device, &tz->temp_input.attr);
515         if (result)
516                 goto unregister_hwmon_device;
517
518         if (tz->ops->get_crit_temp) {
519                 unsigned long temperature;
520                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
521                         snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
522                                 "temp%d_crit", hwmon->count);
523                         tz->temp_crit.attr.attr.name = tz->temp_crit.name;
524                         tz->temp_crit.attr.attr.mode = 0444;
525                         tz->temp_crit.attr.show = temp_crit_show;
526                         sysfs_attr_init(&tz->temp_crit.attr.attr);
527                         result = device_create_file(hwmon->device,
528                                                     &tz->temp_crit.attr);
529                         if (result)
530                                 goto unregister_hwmon_device;
531                 }
532         }
533
534         mutex_lock(&thermal_list_lock);
535         if (new_hwmon_device)
536                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
537         list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
538         mutex_unlock(&thermal_list_lock);
539
540         return 0;
541
542  unregister_hwmon_device:
543         device_remove_file(hwmon->device, &tz->temp_crit.attr);
544         device_remove_file(hwmon->device, &tz->temp_input.attr);
545         if (new_hwmon_device) {
546                 device_remove_file(hwmon->device, &dev_attr_name);
547                 hwmon_device_unregister(hwmon->device);
548         }
549  free_mem:
550         if (new_hwmon_device)
551                 kfree(hwmon);
552
553         return result;
554 }
555
556 static void
557 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
558 {
559         struct thermal_hwmon_device *hwmon = tz->hwmon;
560
561         tz->hwmon = NULL;
562         device_remove_file(hwmon->device, &tz->temp_input.attr);
563         if (tz->ops->get_crit_temp)
564                 device_remove_file(hwmon->device, &tz->temp_crit.attr);
565
566         mutex_lock(&thermal_list_lock);
567         list_del(&tz->hwmon_node);
568         if (!list_empty(&hwmon->tz_list)) {
569                 mutex_unlock(&thermal_list_lock);
570                 return;
571         }
572         list_del(&hwmon->node);
573         mutex_unlock(&thermal_list_lock);
574
575         device_remove_file(hwmon->device, &dev_attr_name);
576         hwmon_device_unregister(hwmon->device);
577         kfree(hwmon);
578 }
579 #else
580 static int
581 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
582 {
583         return 0;
584 }
585
586 static void
587 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
588 {
589 }
590 #endif
591
592 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
593                                             int delay)
594 {
595         cancel_delayed_work(&(tz->poll_queue));
596
597         if (!delay)
598                 return;
599
600         if (delay > 1000)
601                 schedule_delayed_work(&(tz->poll_queue),
602                                       round_jiffies(msecs_to_jiffies(delay)));
603         else
604                 schedule_delayed_work(&(tz->poll_queue),
605                                       msecs_to_jiffies(delay));
606 }
607
608 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
609                                         int temp, int trip_temp, int trip)
610 {
611         int trend = 0;
612         struct thermal_cooling_device_instance *instance;
613         struct thermal_cooling_device *cdev;
614         long state, max_state;
615
616         /*
617          * Above Trip?
618          * -----------
619          * Calculate the thermal trend (using the passive cooling equation)
620          * and modify the performance limit for all passive cooling devices
621          * accordingly.  Note that we assume symmetry.
622          */
623         if (temp >= trip_temp) {
624                 tz->passive = true;
625
626                 trend = (tz->tc1 * (temp - tz->last_temperature)) +
627                         (tz->tc2 * (temp - trip_temp));
628
629                 /* Heating up? */
630                 if (trend > 0) {
631                         list_for_each_entry(instance, &tz->cooling_devices,
632                                             node) {
633                                 if (instance->trip != trip)
634                                         continue;
635                                 cdev = instance->cdev;
636                                 cdev->ops->get_cur_state(cdev, &state);
637                                 cdev->ops->get_max_state(cdev, &max_state);
638                                 if (state++ < max_state)
639                                         cdev->ops->set_cur_state(cdev, state);
640                         }
641                 } else if (trend < 0) { /* Cooling off? */
642                         list_for_each_entry(instance, &tz->cooling_devices,
643                                             node) {
644                                 if (instance->trip != trip)
645                                         continue;
646                                 cdev = instance->cdev;
647                                 cdev->ops->get_cur_state(cdev, &state);
648                                 cdev->ops->get_max_state(cdev, &max_state);
649                                 if (state > 0)
650                                         cdev->ops->set_cur_state(cdev, --state);
651                         }
652                 }
653                 return;
654         }
655
656         /*
657          * Below Trip?
658          * -----------
659          * Implement passive cooling hysteresis to slowly increase performance
660          * and avoid thrashing around the passive trip point.  Note that we
661          * assume symmetry.
662          */
663         list_for_each_entry(instance, &tz->cooling_devices, node) {
664                 if (instance->trip != trip)
665                         continue;
666                 cdev = instance->cdev;
667                 cdev->ops->get_cur_state(cdev, &state);
668                 cdev->ops->get_max_state(cdev, &max_state);
669                 if (state > 0)
670                         cdev->ops->set_cur_state(cdev, --state);
671                 if (state == 0)
672                         tz->passive = false;
673         }
674 }
675
676 static void thermal_zone_device_check(struct work_struct *work)
677 {
678         struct thermal_zone_device *tz = container_of(work, struct
679                                                       thermal_zone_device,
680                                                       poll_queue.work);
681         thermal_zone_device_update(tz);
682 }
683
684 /**
685  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
686  * @tz:         thermal zone device
687  * @trip:       indicates which trip point the cooling devices is
688  *              associated with in this thermal zone.
689  * @cdev:       thermal cooling device
690  *
691  * This function is usually called in the thermal zone device .bind callback.
692  */
693 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
694                                      int trip,
695                                      struct thermal_cooling_device *cdev)
696 {
697         struct thermal_cooling_device_instance *dev;
698         struct thermal_cooling_device_instance *pos;
699         struct thermal_zone_device *pos1;
700         struct thermal_cooling_device *pos2;
701         int result;
702
703         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
704                 return -EINVAL;
705
706         list_for_each_entry(pos1, &thermal_tz_list, node) {
707                 if (pos1 == tz)
708                         break;
709         }
710         list_for_each_entry(pos2, &thermal_cdev_list, node) {
711                 if (pos2 == cdev)
712                         break;
713         }
714
715         if (tz != pos1 || cdev != pos2)
716                 return -EINVAL;
717
718         dev =
719             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
720         if (!dev)
721                 return -ENOMEM;
722         dev->tz = tz;
723         dev->cdev = cdev;
724         dev->trip = trip;
725         result = get_idr(&tz->idr, &tz->lock, &dev->id);
726         if (result)
727                 goto free_mem;
728
729         sprintf(dev->name, "cdev%d", dev->id);
730         result =
731             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
732         if (result)
733                 goto release_idr;
734
735         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
736         sysfs_attr_init(&dev->attr.attr);
737         dev->attr.attr.name = dev->attr_name;
738         dev->attr.attr.mode = 0444;
739         dev->attr.show = thermal_cooling_device_trip_point_show;
740         result = device_create_file(&tz->device, &dev->attr);
741         if (result)
742                 goto remove_symbol_link;
743
744         mutex_lock(&tz->lock);
745         list_for_each_entry(pos, &tz->cooling_devices, node)
746             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
747                 result = -EEXIST;
748                 break;
749         }
750         if (!result)
751                 list_add_tail(&dev->node, &tz->cooling_devices);
752         mutex_unlock(&tz->lock);
753
754         if (!result)
755                 return 0;
756
757         device_remove_file(&tz->device, &dev->attr);
758       remove_symbol_link:
759         sysfs_remove_link(&tz->device.kobj, dev->name);
760       release_idr:
761         release_idr(&tz->idr, &tz->lock, dev->id);
762       free_mem:
763         kfree(dev);
764         return result;
765 }
766
767 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
768
769 /**
770  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
771  * @tz:         thermal zone device
772  * @trip:       indicates which trip point the cooling devices is
773  *              associated with in this thermal zone.
774  * @cdev:       thermal cooling device
775  *
776  * This function is usually called in the thermal zone device .unbind callback.
777  */
778 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
779                                        int trip,
780                                        struct thermal_cooling_device *cdev)
781 {
782         struct thermal_cooling_device_instance *pos, *next;
783
784         mutex_lock(&tz->lock);
785         list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
786                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
787                         list_del(&pos->node);
788                         mutex_unlock(&tz->lock);
789                         goto unbind;
790                 }
791         }
792         mutex_unlock(&tz->lock);
793
794         return -ENODEV;
795
796       unbind:
797         device_remove_file(&tz->device, &pos->attr);
798         sysfs_remove_link(&tz->device.kobj, pos->name);
799         release_idr(&tz->idr, &tz->lock, pos->id);
800         kfree(pos);
801         return 0;
802 }
803
804 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
805
806 static void thermal_release(struct device *dev)
807 {
808         struct thermal_zone_device *tz;
809         struct thermal_cooling_device *cdev;
810
811         if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
812                 tz = to_thermal_zone(dev);
813                 kfree(tz);
814         } else {
815                 cdev = to_cooling_device(dev);
816                 kfree(cdev);
817         }
818 }
819
820 static struct class thermal_class = {
821         .name = "thermal",
822         .dev_release = thermal_release,
823 };
824
825 /**
826  * thermal_cooling_device_register - register a new thermal cooling device
827  * @type:       the thermal cooling device type.
828  * @devdata:    device private data.
829  * @ops:                standard thermal cooling devices callbacks.
830  */
831 struct thermal_cooling_device *thermal_cooling_device_register(
832      char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
833 {
834         struct thermal_cooling_device *cdev;
835         struct thermal_zone_device *pos;
836         int result;
837
838         if (strlen(type) >= THERMAL_NAME_LENGTH)
839                 return ERR_PTR(-EINVAL);
840
841         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
842             !ops->set_cur_state)
843                 return ERR_PTR(-EINVAL);
844
845         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
846         if (!cdev)
847                 return ERR_PTR(-ENOMEM);
848
849         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
850         if (result) {
851                 kfree(cdev);
852                 return ERR_PTR(result);
853         }
854
855         strcpy(cdev->type, type);
856         cdev->ops = ops;
857         cdev->device.class = &thermal_class;
858         cdev->devdata = devdata;
859         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
860         result = device_register(&cdev->device);
861         if (result) {
862                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
863                 kfree(cdev);
864                 return ERR_PTR(result);
865         }
866
867         /* sys I/F */
868         if (type) {
869                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
870                 if (result)
871                         goto unregister;
872         }
873
874         result = device_create_file(&cdev->device, &dev_attr_max_state);
875         if (result)
876                 goto unregister;
877
878         result = device_create_file(&cdev->device, &dev_attr_cur_state);
879         if (result)
880                 goto unregister;
881
882         mutex_lock(&thermal_list_lock);
883         list_add(&cdev->node, &thermal_cdev_list);
884         list_for_each_entry(pos, &thermal_tz_list, node) {
885                 if (!pos->ops->bind)
886                         continue;
887                 result = pos->ops->bind(pos, cdev);
888                 if (result)
889                         break;
890
891         }
892         mutex_unlock(&thermal_list_lock);
893
894         if (!result)
895                 return cdev;
896
897       unregister:
898         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
899         device_unregister(&cdev->device);
900         return ERR_PTR(result);
901 }
902
903 EXPORT_SYMBOL(thermal_cooling_device_register);
904
905 /**
906  * thermal_cooling_device_unregister - removes the registered thermal cooling device
907  * @cdev:       the thermal cooling device to remove.
908  *
909  * thermal_cooling_device_unregister() must be called when the device is no
910  * longer needed.
911  */
912 void thermal_cooling_device_unregister(struct
913                                        thermal_cooling_device
914                                        *cdev)
915 {
916         struct thermal_zone_device *tz;
917         struct thermal_cooling_device *pos = NULL;
918
919         if (!cdev)
920                 return;
921
922         mutex_lock(&thermal_list_lock);
923         list_for_each_entry(pos, &thermal_cdev_list, node)
924             if (pos == cdev)
925                 break;
926         if (pos != cdev) {
927                 /* thermal cooling device not found */
928                 mutex_unlock(&thermal_list_lock);
929                 return;
930         }
931         list_del(&cdev->node);
932         list_for_each_entry(tz, &thermal_tz_list, node) {
933                 if (!tz->ops->unbind)
934                         continue;
935                 tz->ops->unbind(tz, cdev);
936         }
937         mutex_unlock(&thermal_list_lock);
938         if (cdev->type[0])
939                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
940         device_remove_file(&cdev->device, &dev_attr_max_state);
941         device_remove_file(&cdev->device, &dev_attr_cur_state);
942
943         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
944         device_unregister(&cdev->device);
945         return;
946 }
947
948 EXPORT_SYMBOL(thermal_cooling_device_unregister);
949
950 /**
951  * thermal_zone_device_update - force an update of a thermal zone's state
952  * @ttz:        the thermal zone to update
953  */
954
955 void thermal_zone_device_update(struct thermal_zone_device *tz)
956 {
957         int count, ret = 0;
958         long temp, trip_temp;
959         enum thermal_trip_type trip_type;
960         struct thermal_cooling_device_instance *instance;
961         struct thermal_cooling_device *cdev;
962
963         mutex_lock(&tz->lock);
964
965         if (tz->ops->get_temp(tz, &temp)) {
966                 /* get_temp failed - retry it later */
967                 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
968                        "%d\n", tz->id);
969                 goto leave;
970         }
971
972         for (count = 0; count < tz->trips; count++) {
973                 tz->ops->get_trip_type(tz, count, &trip_type);
974                 tz->ops->get_trip_temp(tz, count, &trip_temp);
975
976                 switch (trip_type) {
977                 case THERMAL_TRIP_CRITICAL:
978                         if (temp >= trip_temp) {
979                                 if (tz->ops->notify)
980                                         ret = tz->ops->notify(tz, count,
981                                                               trip_type);
982                                 if (!ret) {
983                                         printk(KERN_EMERG
984                                                "Critical temperature reached (%ld C), shutting down.\n",
985                                                temp/1000);
986                                         orderly_poweroff(true);
987                                 }
988                         }
989                         break;
990                 case THERMAL_TRIP_HOT:
991                         if (temp >= trip_temp)
992                                 if (tz->ops->notify)
993                                         tz->ops->notify(tz, count, trip_type);
994                         break;
995                 case THERMAL_TRIP_ACTIVE:
996                         list_for_each_entry(instance, &tz->cooling_devices,
997                                             node) {
998                                 if (instance->trip != count)
999                                         continue;
1000
1001                                 cdev = instance->cdev;
1002
1003                                 if (temp >= trip_temp)
1004                                         cdev->ops->set_cur_state(cdev, 1);
1005                                 else
1006                                         cdev->ops->set_cur_state(cdev, 0);
1007                         }
1008                         break;
1009                 case THERMAL_TRIP_PASSIVE:
1010                         if (temp >= trip_temp || tz->passive)
1011                                 thermal_zone_device_passive(tz, temp,
1012                                                             trip_temp, count);
1013                         break;
1014                 }
1015         }
1016
1017         if (tz->forced_passive)
1018                 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1019                                             THERMAL_TRIPS_NONE);
1020
1021         tz->last_temperature = temp;
1022
1023       leave:
1024         if (tz->passive)
1025                 thermal_zone_device_set_polling(tz, tz->passive_delay);
1026         else if (tz->polling_delay)
1027                 thermal_zone_device_set_polling(tz, tz->polling_delay);
1028         else
1029                 thermal_zone_device_set_polling(tz, 0);
1030         mutex_unlock(&tz->lock);
1031 }
1032 EXPORT_SYMBOL(thermal_zone_device_update);
1033
1034 /**
1035  * thermal_zone_device_register - register a new thermal zone device
1036  * @type:       the thermal zone device type
1037  * @trips:      the number of trip points the thermal zone support
1038  * @devdata:    private device data
1039  * @ops:        standard thermal zone device callbacks
1040  * @tc1:        thermal coefficient 1 for passive calculations
1041  * @tc2:        thermal coefficient 2 for passive calculations
1042  * @passive_delay: number of milliseconds to wait between polls when
1043  *                 performing passive cooling
1044  * @polling_delay: number of milliseconds to wait between polls when checking
1045  *                 whether trip points have been crossed (0 for interrupt
1046  *                 driven systems)
1047  *
1048  * thermal_zone_device_unregister() must be called when the device is no
1049  * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1050  * section 11.1.5.1 of the ACPI specification 3.0.
1051  */
1052 struct thermal_zone_device *thermal_zone_device_register(char *type,
1053         int trips, void *devdata,
1054         const struct thermal_zone_device_ops *ops,
1055         int tc1, int tc2, int passive_delay, int polling_delay)
1056 {
1057         struct thermal_zone_device *tz;
1058         struct thermal_cooling_device *pos;
1059         enum thermal_trip_type trip_type;
1060         int result;
1061         int count;
1062         int passive = 0;
1063
1064         if (strlen(type) >= THERMAL_NAME_LENGTH)
1065                 return ERR_PTR(-EINVAL);
1066
1067         if (trips > THERMAL_MAX_TRIPS || trips < 0)
1068                 return ERR_PTR(-EINVAL);
1069
1070         if (!ops || !ops->get_temp)
1071                 return ERR_PTR(-EINVAL);
1072
1073         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1074         if (!tz)
1075                 return ERR_PTR(-ENOMEM);
1076
1077         INIT_LIST_HEAD(&tz->cooling_devices);
1078         idr_init(&tz->idr);
1079         mutex_init(&tz->lock);
1080         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1081         if (result) {
1082                 kfree(tz);
1083                 return ERR_PTR(result);
1084         }
1085
1086         strcpy(tz->type, type);
1087         tz->ops = ops;
1088         tz->device.class = &thermal_class;
1089         tz->devdata = devdata;
1090         tz->trips = trips;
1091         tz->tc1 = tc1;
1092         tz->tc2 = tc2;
1093         tz->passive_delay = passive_delay;
1094         tz->polling_delay = polling_delay;
1095
1096         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1097         result = device_register(&tz->device);
1098         if (result) {
1099                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1100                 kfree(tz);
1101                 return ERR_PTR(result);
1102         }
1103
1104         /* sys I/F */
1105         if (type) {
1106                 result = device_create_file(&tz->device, &dev_attr_type);
1107                 if (result)
1108                         goto unregister;
1109         }
1110
1111         result = device_create_file(&tz->device, &dev_attr_temp);
1112         if (result)
1113                 goto unregister;
1114
1115         if (ops->get_mode) {
1116                 result = device_create_file(&tz->device, &dev_attr_mode);
1117                 if (result)
1118                         goto unregister;
1119         }
1120
1121         for (count = 0; count < trips; count++) {
1122                 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1123                 if (result)
1124                         goto unregister;
1125                 tz->ops->get_trip_type(tz, count, &trip_type);
1126                 if (trip_type == THERMAL_TRIP_PASSIVE)
1127                         passive = 1;
1128         }
1129
1130         if (!passive)
1131                 result = device_create_file(&tz->device,
1132                                             &dev_attr_passive);
1133
1134         if (result)
1135                 goto unregister;
1136
1137         result = thermal_add_hwmon_sysfs(tz);
1138         if (result)
1139                 goto unregister;
1140
1141         mutex_lock(&thermal_list_lock);
1142         list_add_tail(&tz->node, &thermal_tz_list);
1143         if (ops->bind)
1144                 list_for_each_entry(pos, &thermal_cdev_list, node) {
1145                 result = ops->bind(tz, pos);
1146                 if (result)
1147                         break;
1148                 }
1149         mutex_unlock(&thermal_list_lock);
1150
1151         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1152
1153         thermal_zone_device_update(tz);
1154
1155         if (!result)
1156                 return tz;
1157
1158       unregister:
1159         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1160         device_unregister(&tz->device);
1161         return ERR_PTR(result);
1162 }
1163
1164 EXPORT_SYMBOL(thermal_zone_device_register);
1165
1166 /**
1167  * thermal_device_unregister - removes the registered thermal zone device
1168  * @tz: the thermal zone device to remove
1169  */
1170 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1171 {
1172         struct thermal_cooling_device *cdev;
1173         struct thermal_zone_device *pos = NULL;
1174         int count;
1175
1176         if (!tz)
1177                 return;
1178
1179         mutex_lock(&thermal_list_lock);
1180         list_for_each_entry(pos, &thermal_tz_list, node)
1181             if (pos == tz)
1182                 break;
1183         if (pos != tz) {
1184                 /* thermal zone device not found */
1185                 mutex_unlock(&thermal_list_lock);
1186                 return;
1187         }
1188         list_del(&tz->node);
1189         if (tz->ops->unbind)
1190                 list_for_each_entry(cdev, &thermal_cdev_list, node)
1191                     tz->ops->unbind(tz, cdev);
1192         mutex_unlock(&thermal_list_lock);
1193
1194         thermal_zone_device_set_polling(tz, 0);
1195
1196         if (tz->type[0])
1197                 device_remove_file(&tz->device, &dev_attr_type);
1198         device_remove_file(&tz->device, &dev_attr_temp);
1199         if (tz->ops->get_mode)
1200                 device_remove_file(&tz->device, &dev_attr_mode);
1201
1202         for (count = 0; count < tz->trips; count++)
1203                 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1204
1205         thermal_remove_hwmon_sysfs(tz);
1206         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1207         idr_destroy(&tz->idr);
1208         mutex_destroy(&tz->lock);
1209         device_unregister(&tz->device);
1210         return;
1211 }
1212
1213 EXPORT_SYMBOL(thermal_zone_device_unregister);
1214
1215 #ifdef CONFIG_NET
1216 static struct genl_family thermal_event_genl_family = {
1217         .id = GENL_ID_GENERATE,
1218         .name = THERMAL_GENL_FAMILY_NAME,
1219         .version = THERMAL_GENL_VERSION,
1220         .maxattr = THERMAL_GENL_ATTR_MAX,
1221 };
1222
1223 static struct genl_multicast_group thermal_event_mcgrp = {
1224         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1225 };
1226
1227 int generate_netlink_event(u32 orig, enum events event)
1228 {
1229         struct sk_buff *skb;
1230         struct nlattr *attr;
1231         struct thermal_genl_event *thermal_event;
1232         void *msg_header;
1233         int size;
1234         int result;
1235
1236         /* allocate memory */
1237         size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1238                                 nla_total_size(0);
1239
1240         skb = genlmsg_new(size, GFP_ATOMIC);
1241         if (!skb)
1242                 return -ENOMEM;
1243
1244         /* add the genetlink message header */
1245         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1246                                  &thermal_event_genl_family, 0,
1247                                  THERMAL_GENL_CMD_EVENT);
1248         if (!msg_header) {
1249                 nlmsg_free(skb);
1250                 return -ENOMEM;
1251         }
1252
1253         /* fill the data */
1254         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1255                         sizeof(struct thermal_genl_event));
1256
1257         if (!attr) {
1258                 nlmsg_free(skb);
1259                 return -EINVAL;
1260         }
1261
1262         thermal_event = nla_data(attr);
1263         if (!thermal_event) {
1264                 nlmsg_free(skb);
1265                 return -EINVAL;
1266         }
1267
1268         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1269
1270         thermal_event->orig = orig;
1271         thermal_event->event = event;
1272
1273         /* send multicast genetlink message */
1274         result = genlmsg_end(skb, msg_header);
1275         if (result < 0) {
1276                 nlmsg_free(skb);
1277                 return result;
1278         }
1279
1280         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1281         if (result)
1282                 printk(KERN_INFO "failed to send netlink event:%d", result);
1283
1284         return result;
1285 }
1286 EXPORT_SYMBOL(generate_netlink_event);
1287
1288 static int genetlink_init(void)
1289 {
1290         int result;
1291
1292         result = genl_register_family(&thermal_event_genl_family);
1293         if (result)
1294                 return result;
1295
1296         result = genl_register_mc_group(&thermal_event_genl_family,
1297                                         &thermal_event_mcgrp);
1298         if (result)
1299                 genl_unregister_family(&thermal_event_genl_family);
1300         return result;
1301 }
1302
1303 static void genetlink_exit(void)
1304 {
1305         genl_unregister_family(&thermal_event_genl_family);
1306 }
1307 #else /* !CONFIG_NET */
1308 static inline int genetlink_init(void) { return 0; }
1309 static inline void genetlink_exit(void) {}
1310 #endif /* !CONFIG_NET */
1311
1312 static int __init thermal_init(void)
1313 {
1314         int result = 0;
1315
1316         result = class_register(&thermal_class);
1317         if (result) {
1318                 idr_destroy(&thermal_tz_idr);
1319                 idr_destroy(&thermal_cdev_idr);
1320                 mutex_destroy(&thermal_idr_lock);
1321                 mutex_destroy(&thermal_list_lock);
1322         }
1323         result = genetlink_init();
1324         return result;
1325 }
1326
1327 static void __exit thermal_exit(void)
1328 {
1329         class_unregister(&thermal_class);
1330         idr_destroy(&thermal_tz_idr);
1331         idr_destroy(&thermal_cdev_idr);
1332         mutex_destroy(&thermal_idr_lock);
1333         mutex_destroy(&thermal_list_lock);
1334         genetlink_exit();
1335 }
1336
1337 fs_initcall(thermal_init);
1338 module_exit(thermal_exit);