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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
38MODULE_AUTHOR("Zhang Rui");
39MODULE_DESCRIPTION("Generic thermal management sysfs support");
40MODULE_LICENSE("GPL");
41
42#define PREFIX "Thermal: "
43
44struct 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
55static DEFINE_IDR(thermal_tz_idr);
56static DEFINE_IDR(thermal_cdev_idr);
57static DEFINE_MUTEX(thermal_idr_lock);
58
59static LIST_HEAD(thermal_tz_list);
60static LIST_HEAD(thermal_cdev_list);
61static DEFINE_MUTEX(thermal_list_lock);
62
63static unsigned int thermal_event_seqnum;
64
65static 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
87static 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
101static ssize_t
102type_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
109static ssize_t
110temp_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
127static ssize_t
128mode_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
145static ssize_t
146mode_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
168static ssize_t
169trip_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
200static ssize_t
201trip_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
222static ssize_t
223passive_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
274static ssize_t
275passive_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
283static DEVICE_ATTR(type, 0444, type_show, NULL);
284static DEVICE_ATTR(temp, 0444, temp_show, NULL);
285static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
286static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
287 passive_store);
288
289static 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) \
317do { \
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) \
327do { \
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
336static ssize_t
337thermal_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
345static ssize_t
346thermal_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
359static ssize_t
360thermal_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
373static ssize_t
374thermal_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
394static struct device_attribute dev_attr_cdev_type =
395__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
396static DEVICE_ATTR(max_state, 0444,
397 thermal_cooling_device_max_state_show, NULL);
398static DEVICE_ATTR(cur_state, 0644,
399 thermal_cooling_device_cur_state_show,
400 thermal_cooling_device_cur_state_store);
401
402static ssize_t
403thermal_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
424/* thermal zone devices with the same type share one hwmon device */
425struct thermal_hwmon_device {
426 char type[THERMAL_NAME_LENGTH];
427 struct device *device;
428 int count;
429 struct list_head tz_list;
430 struct list_head node;
431};
432
433struct thermal_hwmon_attr {
434 struct device_attribute attr;
435 char name[16];
436};
437
438/* one temperature input for each thermal zone */
439struct thermal_hwmon_temp {
440 struct list_head hwmon_node;
441 struct thermal_zone_device *tz;
442 struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
443 struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
444};
445
446static LIST_HEAD(thermal_hwmon_list);
447
448static ssize_t
449name_show(struct device *dev, struct device_attribute *attr, char *buf)
450{
451 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
452 return sprintf(buf, "%s\n", hwmon->type);
453}
454static DEVICE_ATTR(name, 0444, name_show, NULL);
455
456static ssize_t
457temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
458{
459 long temperature;
460 int ret;
461 struct thermal_hwmon_attr *hwmon_attr
462 = container_of(attr, struct thermal_hwmon_attr, attr);
463 struct thermal_hwmon_temp *temp
464 = container_of(hwmon_attr, struct thermal_hwmon_temp,
465 temp_input);
466 struct thermal_zone_device *tz = temp->tz;
467
468 ret = tz->ops->get_temp(tz, &temperature);
469
470 if (ret)
471 return ret;
472
473 return sprintf(buf, "%ld\n", temperature);
474}
475
476static ssize_t
477temp_crit_show(struct device *dev, struct device_attribute *attr,
478 char *buf)
479{
480 struct thermal_hwmon_attr *hwmon_attr
481 = container_of(attr, struct thermal_hwmon_attr, attr);
482 struct thermal_hwmon_temp *temp
483 = container_of(hwmon_attr, struct thermal_hwmon_temp,
484 temp_crit);
485 struct thermal_zone_device *tz = temp->tz;
486 long temperature;
487 int ret;
488
489 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
490 if (ret)
491 return ret;
492
493 return sprintf(buf, "%ld\n", temperature);
494}
495
496
497static struct thermal_hwmon_device *
498thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
499{
500 struct thermal_hwmon_device *hwmon;
501
502 mutex_lock(&thermal_list_lock);
503 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
504 if (!strcmp(hwmon->type, tz->type)) {
505 mutex_unlock(&thermal_list_lock);
506 return hwmon;
507 }
508 mutex_unlock(&thermal_list_lock);
509
510 return NULL;
511}
512
513/* Find the temperature input matching a given thermal zone */
514static struct thermal_hwmon_temp *
515thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
516 const struct thermal_zone_device *tz)
517{
518 struct thermal_hwmon_temp *temp;
519
520 mutex_lock(&thermal_list_lock);
521 list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
522 if (temp->tz == tz) {
523 mutex_unlock(&thermal_list_lock);
524 return temp;
525 }
526 mutex_unlock(&thermal_list_lock);
527
528 return NULL;
529}
530
531static int
532thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
533{
534 struct thermal_hwmon_device *hwmon;
535 struct thermal_hwmon_temp *temp;
536 int new_hwmon_device = 1;
537 int result;
538
539 hwmon = thermal_hwmon_lookup_by_type(tz);
540 if (hwmon) {
541 new_hwmon_device = 0;
542 goto register_sys_interface;
543 }
544
545 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
546 if (!hwmon)
547 return -ENOMEM;
548
549 INIT_LIST_HEAD(&hwmon->tz_list);
550 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
551 hwmon->device = hwmon_device_register(NULL);
552 if (IS_ERR(hwmon->device)) {
553 result = PTR_ERR(hwmon->device);
554 goto free_mem;
555 }
556 dev_set_drvdata(hwmon->device, hwmon);
557 result = device_create_file(hwmon->device, &dev_attr_name);
558 if (result)
559 goto free_mem;
560
561 register_sys_interface:
562 temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
563 if (!temp) {
564 result = -ENOMEM;
565 goto unregister_name;
566 }
567
568 temp->tz = tz;
569 hwmon->count++;
570
571 snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
572 "temp%d_input", hwmon->count);
573 temp->temp_input.attr.attr.name = temp->temp_input.name;
574 temp->temp_input.attr.attr.mode = 0444;
575 temp->temp_input.attr.show = temp_input_show;
576 sysfs_attr_init(&temp->temp_input.attr.attr);
577 result = device_create_file(hwmon->device, &temp->temp_input.attr);
578 if (result)
579 goto free_temp_mem;
580
581 if (tz->ops->get_crit_temp) {
582 unsigned long temperature;
583 if (!tz->ops->get_crit_temp(tz, &temperature)) {
584 snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
585 "temp%d_crit", hwmon->count);
586 temp->temp_crit.attr.attr.name = temp->temp_crit.name;
587 temp->temp_crit.attr.attr.mode = 0444;
588 temp->temp_crit.attr.show = temp_crit_show;
589 sysfs_attr_init(&temp->temp_crit.attr.attr);
590 result = device_create_file(hwmon->device,
591 &temp->temp_crit.attr);
592 if (result)
593 goto unregister_input;
594 }
595 }
596
597 mutex_lock(&thermal_list_lock);
598 if (new_hwmon_device)
599 list_add_tail(&hwmon->node, &thermal_hwmon_list);
600 list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
601 mutex_unlock(&thermal_list_lock);
602
603 return 0;
604
605 unregister_input:
606 device_remove_file(hwmon->device, &temp->temp_input.attr);
607 free_temp_mem:
608 kfree(temp);
609 unregister_name:
610 if (new_hwmon_device) {
611 device_remove_file(hwmon->device, &dev_attr_name);
612 hwmon_device_unregister(hwmon->device);
613 }
614 free_mem:
615 if (new_hwmon_device)
616 kfree(hwmon);
617
618 return result;
619}
620
621static void
622thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
623{
624 struct thermal_hwmon_device *hwmon;
625 struct thermal_hwmon_temp *temp;
626
627 hwmon = thermal_hwmon_lookup_by_type(tz);
628 if (unlikely(!hwmon)) {
629 /* Should never happen... */
630 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
631 return;
632 }
633
634 temp = thermal_hwmon_lookup_temp(hwmon, tz);
635 if (unlikely(!temp)) {
636 /* Should never happen... */
637 dev_dbg(&tz->device, "temperature input lookup failed!\n");
638 return;
639 }
640
641 device_remove_file(hwmon->device, &temp->temp_input.attr);
642 if (tz->ops->get_crit_temp)
643 device_remove_file(hwmon->device, &temp->temp_crit.attr);
644
645 mutex_lock(&thermal_list_lock);
646 list_del(&temp->hwmon_node);
647 kfree(temp);
648 if (!list_empty(&hwmon->tz_list)) {
649 mutex_unlock(&thermal_list_lock);
650 return;
651 }
652 list_del(&hwmon->node);
653 mutex_unlock(&thermal_list_lock);
654
655 device_remove_file(hwmon->device, &dev_attr_name);
656 hwmon_device_unregister(hwmon->device);
657 kfree(hwmon);
658}
659#else
660static int
661thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
662{
663 return 0;
664}
665
666static void
667thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
668{
669}
670#endif
671
672static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
673 int delay)
674{
675 cancel_delayed_work(&(tz->poll_queue));
676
677 if (!delay)
678 return;
679
680 if (delay > 1000)
681 schedule_delayed_work(&(tz->poll_queue),
682 round_jiffies(msecs_to_jiffies(delay)));
683 else
684 schedule_delayed_work(&(tz->poll_queue),
685 msecs_to_jiffies(delay));
686}
687
688static void thermal_zone_device_passive(struct thermal_zone_device *tz,
689 int temp, int trip_temp, int trip)
690{
691 int trend = 0;
692 struct thermal_cooling_device_instance *instance;
693 struct thermal_cooling_device *cdev;
694 long state, max_state;
695
696 /*
697 * Above Trip?
698 * -----------
699 * Calculate the thermal trend (using the passive cooling equation)
700 * and modify the performance limit for all passive cooling devices
701 * accordingly. Note that we assume symmetry.
702 */
703 if (temp >= trip_temp) {
704 tz->passive = true;
705
706 trend = (tz->tc1 * (temp - tz->last_temperature)) +
707 (tz->tc2 * (temp - trip_temp));
708
709 /* Heating up? */
710 if (trend > 0) {
711 list_for_each_entry(instance, &tz->cooling_devices,
712 node) {
713 if (instance->trip != trip)
714 continue;
715 cdev = instance->cdev;
716 cdev->ops->get_cur_state(cdev, &state);
717 cdev->ops->get_max_state(cdev, &max_state);
718 if (state++ < max_state)
719 cdev->ops->set_cur_state(cdev, state);
720 }
721 } else if (trend < 0) { /* Cooling off? */
722 list_for_each_entry(instance, &tz->cooling_devices,
723 node) {
724 if (instance->trip != trip)
725 continue;
726 cdev = instance->cdev;
727 cdev->ops->get_cur_state(cdev, &state);
728 cdev->ops->get_max_state(cdev, &max_state);
729 if (state > 0)
730 cdev->ops->set_cur_state(cdev, --state);
731 }
732 }
733 return;
734 }
735
736 /*
737 * Below Trip?
738 * -----------
739 * Implement passive cooling hysteresis to slowly increase performance
740 * and avoid thrashing around the passive trip point. Note that we
741 * assume symmetry.
742 */
743 list_for_each_entry(instance, &tz->cooling_devices, node) {
744 if (instance->trip != trip)
745 continue;
746 cdev = instance->cdev;
747 cdev->ops->get_cur_state(cdev, &state);
748 cdev->ops->get_max_state(cdev, &max_state);
749 if (state > 0)
750 cdev->ops->set_cur_state(cdev, --state);
751 if (state == 0)
752 tz->passive = false;
753 }
754}
755
756static void thermal_zone_device_check(struct work_struct *work)
757{
758 struct thermal_zone_device *tz = container_of(work, struct
759 thermal_zone_device,
760 poll_queue.work);
761 thermal_zone_device_update(tz);
762}
763
764/**
765 * thermal_zone_bind_cooling_device - bind a cooling device to 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 .bind callback.
772 */
773int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
774 int trip,
775 struct thermal_cooling_device *cdev)
776{
777 struct thermal_cooling_device_instance *dev;
778 struct thermal_cooling_device_instance *pos;
779 struct thermal_zone_device *pos1;
780 struct thermal_cooling_device *pos2;
781 int result;
782
783 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
784 return -EINVAL;
785
786 list_for_each_entry(pos1, &thermal_tz_list, node) {
787 if (pos1 == tz)
788 break;
789 }
790 list_for_each_entry(pos2, &thermal_cdev_list, node) {
791 if (pos2 == cdev)
792 break;
793 }
794
795 if (tz != pos1 || cdev != pos2)
796 return -EINVAL;
797
798 dev =
799 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
800 if (!dev)
801 return -ENOMEM;
802 dev->tz = tz;
803 dev->cdev = cdev;
804 dev->trip = trip;
805 result = get_idr(&tz->idr, &tz->lock, &dev->id);
806 if (result)
807 goto free_mem;
808
809 sprintf(dev->name, "cdev%d", dev->id);
810 result =
811 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
812 if (result)
813 goto release_idr;
814
815 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
816 sysfs_attr_init(&dev->attr.attr);
817 dev->attr.attr.name = dev->attr_name;
818 dev->attr.attr.mode = 0444;
819 dev->attr.show = thermal_cooling_device_trip_point_show;
820 result = device_create_file(&tz->device, &dev->attr);
821 if (result)
822 goto remove_symbol_link;
823
824 mutex_lock(&tz->lock);
825 list_for_each_entry(pos, &tz->cooling_devices, node)
826 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
827 result = -EEXIST;
828 break;
829 }
830 if (!result)
831 list_add_tail(&dev->node, &tz->cooling_devices);
832 mutex_unlock(&tz->lock);
833
834 if (!result)
835 return 0;
836
837 device_remove_file(&tz->device, &dev->attr);
838 remove_symbol_link:
839 sysfs_remove_link(&tz->device.kobj, dev->name);
840 release_idr:
841 release_idr(&tz->idr, &tz->lock, dev->id);
842 free_mem:
843 kfree(dev);
844 return result;
845}
846
847EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
848
849/**
850 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
851 * @tz: thermal zone device
852 * @trip: indicates which trip point the cooling devices is
853 * associated with in this thermal zone.
854 * @cdev: thermal cooling device
855 *
856 * This function is usually called in the thermal zone device .unbind callback.
857 */
858int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
859 int trip,
860 struct thermal_cooling_device *cdev)
861{
862 struct thermal_cooling_device_instance *pos, *next;
863
864 mutex_lock(&tz->lock);
865 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
866 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
867 list_del(&pos->node);
868 mutex_unlock(&tz->lock);
869 goto unbind;
870 }
871 }
872 mutex_unlock(&tz->lock);
873
874 return -ENODEV;
875
876 unbind:
877 device_remove_file(&tz->device, &pos->attr);
878 sysfs_remove_link(&tz->device.kobj, pos->name);
879 release_idr(&tz->idr, &tz->lock, pos->id);
880 kfree(pos);
881 return 0;
882}
883
884EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
885
886static void thermal_release(struct device *dev)
887{
888 struct thermal_zone_device *tz;
889 struct thermal_cooling_device *cdev;
890
891 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
892 tz = to_thermal_zone(dev);
893 kfree(tz);
894 } else {
895 cdev = to_cooling_device(dev);
896 kfree(cdev);
897 }
898}
899
900static struct class thermal_class = {
901 .name = "thermal",
902 .dev_release = thermal_release,
903};
904
905/**
906 * thermal_cooling_device_register - register a new thermal cooling device
907 * @type: the thermal cooling device type.
908 * @devdata: device private data.
909 * @ops: standard thermal cooling devices callbacks.
910 */
911struct thermal_cooling_device *thermal_cooling_device_register(
912 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
913{
914 struct thermal_cooling_device *cdev;
915 struct thermal_zone_device *pos;
916 int result;
917
918 if (strlen(type) >= THERMAL_NAME_LENGTH)
919 return ERR_PTR(-EINVAL);
920
921 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
922 !ops->set_cur_state)
923 return ERR_PTR(-EINVAL);
924
925 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
926 if (!cdev)
927 return ERR_PTR(-ENOMEM);
928
929 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
930 if (result) {
931 kfree(cdev);
932 return ERR_PTR(result);
933 }
934
935 strcpy(cdev->type, type);
936 cdev->ops = ops;
937 cdev->device.class = &thermal_class;
938 cdev->devdata = devdata;
939 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
940 result = device_register(&cdev->device);
941 if (result) {
942 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
943 kfree(cdev);
944 return ERR_PTR(result);
945 }
946
947 /* sys I/F */
948 if (type) {
949 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
950 if (result)
951 goto unregister;
952 }
953
954 result = device_create_file(&cdev->device, &dev_attr_max_state);
955 if (result)
956 goto unregister;
957
958 result = device_create_file(&cdev->device, &dev_attr_cur_state);
959 if (result)
960 goto unregister;
961
962 mutex_lock(&thermal_list_lock);
963 list_add(&cdev->node, &thermal_cdev_list);
964 list_for_each_entry(pos, &thermal_tz_list, node) {
965 if (!pos->ops->bind)
966 continue;
967 result = pos->ops->bind(pos, cdev);
968 if (result)
969 break;
970
971 }
972 mutex_unlock(&thermal_list_lock);
973
974 if (!result)
975 return cdev;
976
977 unregister:
978 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
979 device_unregister(&cdev->device);
980 return ERR_PTR(result);
981}
982
983EXPORT_SYMBOL(thermal_cooling_device_register);
984
985/**
986 * thermal_cooling_device_unregister - removes the registered thermal cooling device
987 * @cdev: the thermal cooling device to remove.
988 *
989 * thermal_cooling_device_unregister() must be called when the device is no
990 * longer needed.
991 */
992void thermal_cooling_device_unregister(struct
993 thermal_cooling_device
994 *cdev)
995{
996 struct thermal_zone_device *tz;
997 struct thermal_cooling_device *pos = NULL;
998
999 if (!cdev)
1000 return;
1001
1002 mutex_lock(&thermal_list_lock);
1003 list_for_each_entry(pos, &thermal_cdev_list, node)
1004 if (pos == cdev)
1005 break;
1006 if (pos != cdev) {
1007 /* thermal cooling device not found */
1008 mutex_unlock(&thermal_list_lock);
1009 return;
1010 }
1011 list_del(&cdev->node);
1012 list_for_each_entry(tz, &thermal_tz_list, node) {
1013 if (!tz->ops->unbind)
1014 continue;
1015 tz->ops->unbind(tz, cdev);
1016 }
1017 mutex_unlock(&thermal_list_lock);
1018 if (cdev->type[0])
1019 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1020 device_remove_file(&cdev->device, &dev_attr_max_state);
1021 device_remove_file(&cdev->device, &dev_attr_cur_state);
1022
1023 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1024 device_unregister(&cdev->device);
1025 return;
1026}
1027
1028EXPORT_SYMBOL(thermal_cooling_device_unregister);
1029
1030/**
1031 * thermal_zone_device_update - force an update of a thermal zone's state
1032 * @ttz: the thermal zone to update
1033 */
1034
1035void thermal_zone_device_update(struct thermal_zone_device *tz)
1036{
1037 int count, ret = 0;
1038 long temp, trip_temp;
1039 enum thermal_trip_type trip_type;
1040 struct thermal_cooling_device_instance *instance;
1041 struct thermal_cooling_device *cdev;
1042
1043 mutex_lock(&tz->lock);
1044
1045 if (tz->ops->get_temp(tz, &temp)) {
1046 /* get_temp failed - retry it later */
1047 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
1048 "%d\n", tz->id);
1049 goto leave;
1050 }
1051
1052 for (count = 0; count < tz->trips; count++) {
1053 tz->ops->get_trip_type(tz, count, &trip_type);
1054 tz->ops->get_trip_temp(tz, count, &trip_temp);
1055
1056 switch (trip_type) {
1057 case THERMAL_TRIP_CRITICAL:
1058 if (temp >= trip_temp) {
1059 if (tz->ops->notify)
1060 ret = tz->ops->notify(tz, count,
1061 trip_type);
1062 if (!ret) {
1063 printk(KERN_EMERG
1064 "Critical temperature reached (%ld C), shutting down.\n",
1065 temp/1000);
1066 orderly_poweroff(true);
1067 }
1068 }
1069 break;
1070 case THERMAL_TRIP_HOT:
1071 if (temp >= trip_temp)
1072 if (tz->ops->notify)
1073 tz->ops->notify(tz, count, trip_type);
1074 break;
1075 case THERMAL_TRIP_ACTIVE:
1076 list_for_each_entry(instance, &tz->cooling_devices,
1077 node) {
1078 if (instance->trip != count)
1079 continue;
1080
1081 cdev = instance->cdev;
1082
1083 if (temp >= trip_temp)
1084 cdev->ops->set_cur_state(cdev, 1);
1085 else
1086 cdev->ops->set_cur_state(cdev, 0);
1087 }
1088 break;
1089 case THERMAL_TRIP_PASSIVE:
1090 if (temp >= trip_temp || tz->passive)
1091 thermal_zone_device_passive(tz, temp,
1092 trip_temp, count);
1093 break;
1094 }
1095 }
1096
1097 if (tz->forced_passive)
1098 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1099 THERMAL_TRIPS_NONE);
1100
1101 tz->last_temperature = temp;
1102
1103 leave:
1104 if (tz->passive)
1105 thermal_zone_device_set_polling(tz, tz->passive_delay);
1106 else if (tz->polling_delay)
1107 thermal_zone_device_set_polling(tz, tz->polling_delay);
1108 else
1109 thermal_zone_device_set_polling(tz, 0);
1110 mutex_unlock(&tz->lock);
1111}
1112EXPORT_SYMBOL(thermal_zone_device_update);
1113
1114/**
1115 * thermal_zone_device_register - register a new thermal zone device
1116 * @type: the thermal zone device type
1117 * @trips: the number of trip points the thermal zone support
1118 * @devdata: private device data
1119 * @ops: standard thermal zone device callbacks
1120 * @tc1: thermal coefficient 1 for passive calculations
1121 * @tc2: thermal coefficient 2 for passive calculations
1122 * @passive_delay: number of milliseconds to wait between polls when
1123 * performing passive cooling
1124 * @polling_delay: number of milliseconds to wait between polls when checking
1125 * whether trip points have been crossed (0 for interrupt
1126 * driven systems)
1127 *
1128 * thermal_zone_device_unregister() must be called when the device is no
1129 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1130 * section 11.1.5.1 of the ACPI specification 3.0.
1131 */
1132struct thermal_zone_device *thermal_zone_device_register(char *type,
1133 int trips, void *devdata,
1134 const struct thermal_zone_device_ops *ops,
1135 int tc1, int tc2, int passive_delay, int polling_delay)
1136{
1137 struct thermal_zone_device *tz;
1138 struct thermal_cooling_device *pos;
1139 enum thermal_trip_type trip_type;
1140 int result;
1141 int count;
1142 int passive = 0;
1143
1144 if (strlen(type) >= THERMAL_NAME_LENGTH)
1145 return ERR_PTR(-EINVAL);
1146
1147 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1148 return ERR_PTR(-EINVAL);
1149
1150 if (!ops || !ops->get_temp)
1151 return ERR_PTR(-EINVAL);
1152
1153 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1154 if (!tz)
1155 return ERR_PTR(-ENOMEM);
1156
1157 INIT_LIST_HEAD(&tz->cooling_devices);
1158 idr_init(&tz->idr);
1159 mutex_init(&tz->lock);
1160 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1161 if (result) {
1162 kfree(tz);
1163 return ERR_PTR(result);
1164 }
1165
1166 strcpy(tz->type, type);
1167 tz->ops = ops;
1168 tz->device.class = &thermal_class;
1169 tz->devdata = devdata;
1170 tz->trips = trips;
1171 tz->tc1 = tc1;
1172 tz->tc2 = tc2;
1173 tz->passive_delay = passive_delay;
1174 tz->polling_delay = polling_delay;
1175
1176 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1177 result = device_register(&tz->device);
1178 if (result) {
1179 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1180 kfree(tz);
1181 return ERR_PTR(result);
1182 }
1183
1184 /* sys I/F */
1185 if (type) {
1186 result = device_create_file(&tz->device, &dev_attr_type);
1187 if (result)
1188 goto unregister;
1189 }
1190
1191 result = device_create_file(&tz->device, &dev_attr_temp);
1192 if (result)
1193 goto unregister;
1194
1195 if (ops->get_mode) {
1196 result = device_create_file(&tz->device, &dev_attr_mode);
1197 if (result)
1198 goto unregister;
1199 }
1200
1201 for (count = 0; count < trips; count++) {
1202 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1203 if (result)
1204 goto unregister;
1205 tz->ops->get_trip_type(tz, count, &trip_type);
1206 if (trip_type == THERMAL_TRIP_PASSIVE)
1207 passive = 1;
1208 }
1209
1210 if (!passive)
1211 result = device_create_file(&tz->device,
1212 &dev_attr_passive);
1213
1214 if (result)
1215 goto unregister;
1216
1217 result = thermal_add_hwmon_sysfs(tz);
1218 if (result)
1219 goto unregister;
1220
1221 mutex_lock(&thermal_list_lock);
1222 list_add_tail(&tz->node, &thermal_tz_list);
1223 if (ops->bind)
1224 list_for_each_entry(pos, &thermal_cdev_list, node) {
1225 result = ops->bind(tz, pos);
1226 if (result)
1227 break;
1228 }
1229 mutex_unlock(&thermal_list_lock);
1230
1231 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1232
1233 thermal_zone_device_update(tz);
1234
1235 if (!result)
1236 return tz;
1237
1238 unregister:
1239 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1240 device_unregister(&tz->device);
1241 return ERR_PTR(result);
1242}
1243
1244EXPORT_SYMBOL(thermal_zone_device_register);
1245
1246/**
1247 * thermal_device_unregister - removes the registered thermal zone device
1248 * @tz: the thermal zone device to remove
1249 */
1250void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1251{
1252 struct thermal_cooling_device *cdev;
1253 struct thermal_zone_device *pos = NULL;
1254 int count;
1255
1256 if (!tz)
1257 return;
1258
1259 mutex_lock(&thermal_list_lock);
1260 list_for_each_entry(pos, &thermal_tz_list, node)
1261 if (pos == tz)
1262 break;
1263 if (pos != tz) {
1264 /* thermal zone device not found */
1265 mutex_unlock(&thermal_list_lock);
1266 return;
1267 }
1268 list_del(&tz->node);
1269 if (tz->ops->unbind)
1270 list_for_each_entry(cdev, &thermal_cdev_list, node)
1271 tz->ops->unbind(tz, cdev);
1272 mutex_unlock(&thermal_list_lock);
1273
1274 thermal_zone_device_set_polling(tz, 0);
1275
1276 if (tz->type[0])
1277 device_remove_file(&tz->device, &dev_attr_type);
1278 device_remove_file(&tz->device, &dev_attr_temp);
1279 if (tz->ops->get_mode)
1280 device_remove_file(&tz->device, &dev_attr_mode);
1281
1282 for (count = 0; count < tz->trips; count++)
1283 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1284
1285 thermal_remove_hwmon_sysfs(tz);
1286 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1287 idr_destroy(&tz->idr);
1288 mutex_destroy(&tz->lock);
1289 device_unregister(&tz->device);
1290 return;
1291}
1292
1293EXPORT_SYMBOL(thermal_zone_device_unregister);
1294
1295#ifdef CONFIG_NET
1296static struct genl_family thermal_event_genl_family = {
1297 .id = GENL_ID_GENERATE,
1298 .name = THERMAL_GENL_FAMILY_NAME,
1299 .version = THERMAL_GENL_VERSION,
1300 .maxattr = THERMAL_GENL_ATTR_MAX,
1301};
1302
1303static struct genl_multicast_group thermal_event_mcgrp = {
1304 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1305};
1306
1307int generate_netlink_event(u32 orig, enum events event)
1308{
1309 struct sk_buff *skb;
1310 struct nlattr *attr;
1311 struct thermal_genl_event *thermal_event;
1312 void *msg_header;
1313 int size;
1314 int result;
1315
1316 /* allocate memory */
1317 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1318 nla_total_size(0);
1319
1320 skb = genlmsg_new(size, GFP_ATOMIC);
1321 if (!skb)
1322 return -ENOMEM;
1323
1324 /* add the genetlink message header */
1325 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1326 &thermal_event_genl_family, 0,
1327 THERMAL_GENL_CMD_EVENT);
1328 if (!msg_header) {
1329 nlmsg_free(skb);
1330 return -ENOMEM;
1331 }
1332
1333 /* fill the data */
1334 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1335 sizeof(struct thermal_genl_event));
1336
1337 if (!attr) {
1338 nlmsg_free(skb);
1339 return -EINVAL;
1340 }
1341
1342 thermal_event = nla_data(attr);
1343 if (!thermal_event) {
1344 nlmsg_free(skb);
1345 return -EINVAL;
1346 }
1347
1348 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1349
1350 thermal_event->orig = orig;
1351 thermal_event->event = event;
1352
1353 /* send multicast genetlink message */
1354 result = genlmsg_end(skb, msg_header);
1355 if (result < 0) {
1356 nlmsg_free(skb);
1357 return result;
1358 }
1359
1360 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1361 if (result)
1362 printk(KERN_INFO "failed to send netlink event:%d", result);
1363
1364 return result;
1365}
1366EXPORT_SYMBOL(generate_netlink_event);
1367
1368static int genetlink_init(void)
1369{
1370 int result;
1371
1372 result = genl_register_family(&thermal_event_genl_family);
1373 if (result)
1374 return result;
1375
1376 result = genl_register_mc_group(&thermal_event_genl_family,
1377 &thermal_event_mcgrp);
1378 if (result)
1379 genl_unregister_family(&thermal_event_genl_family);
1380 return result;
1381}
1382
1383static void genetlink_exit(void)
1384{
1385 genl_unregister_family(&thermal_event_genl_family);
1386}
1387#else /* !CONFIG_NET */
1388static inline int genetlink_init(void) { return 0; }
1389static inline void genetlink_exit(void) {}
1390#endif /* !CONFIG_NET */
1391
1392static int __init thermal_init(void)
1393{
1394 int result = 0;
1395
1396 result = class_register(&thermal_class);
1397 if (result) {
1398 idr_destroy(&thermal_tz_idr);
1399 idr_destroy(&thermal_cdev_idr);
1400 mutex_destroy(&thermal_idr_lock);
1401 mutex_destroy(&thermal_list_lock);
1402 }
1403 result = genetlink_init();
1404 return result;
1405}
1406
1407static void __exit thermal_exit(void)
1408{
1409 class_unregister(&thermal_class);
1410 idr_destroy(&thermal_tz_idr);
1411 idr_destroy(&thermal_cdev_idr);
1412 mutex_destroy(&thermal_idr_lock);
1413 mutex_destroy(&thermal_list_lock);
1414 genetlink_exit();
1415}
1416
1417fs_initcall(thermal_init);
1418module_exit(thermal_exit);