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