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Linux 3.4.102
[linux/fpc-iii.git] / drivers / thermal / thermal_sys.c
blob5c26dda144af45f8dd8597438555e9f7f5b32fb2
1 /*
2 * thermal.c - Generic Thermal Management Sysfs support.
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/device.h>
30 #include <linux/err.h>
31 #include <linux/slab.h>
32 #include <linux/kdev_t.h>
33 #include <linux/idr.h>
34 #include <linux/thermal.h>
35 #include <linux/spinlock.h>
36 #include <linux/reboot.h>
37 #include <net/netlink.h>
38 #include <net/genetlink.h>
39
40 MODULE_AUTHOR("Zhang Rui");
41 MODULE_DESCRIPTION("Generic thermal management sysfs support");
42 MODULE_LICENSE("GPL");
43
44 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 int get_idr(struct idr *idr, struct mutex *lock, int *id)
64 {
65 int err;
66
67 again:
68 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
69 return -ENOMEM;
70
71 if (lock)
72 mutex_lock(lock);
73 err = idr_get_new(idr, NULL, id);
74 if (lock)
75 mutex_unlock(lock);
76 if (unlikely(err == -EAGAIN))
77 goto again;
78 else if (unlikely(err))
79 return err;
80
81 *id = *id & MAX_ID_MASK;
82 return 0;
83 }
84
85 static void release_idr(struct idr *idr, struct mutex *lock, int id)
86 {
87 if (lock)
88 mutex_lock(lock);
89 idr_remove(idr, id);
90 if (lock)
91 mutex_unlock(lock);
92 }
93
94 /* sys I/F for thermal zone */
95
96 #define to_thermal_zone(_dev) \
97 container_of(_dev, struct thermal_zone_device, device)
98
99 static ssize_t
100 type_show(struct device *dev, struct device_attribute *attr, char *buf)
101 {
102 struct thermal_zone_device *tz = to_thermal_zone(dev);
103
104 return sprintf(buf, "%s\n", tz->type);
105 }
106
107 static ssize_t
108 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
109 {
110 struct thermal_zone_device *tz = to_thermal_zone(dev);
111 long temperature;
112 int ret;
113
114 if (!tz->ops->get_temp)
115 return -EPERM;
116
117 ret = tz->ops->get_temp(tz, &temperature);
118
119 if (ret)
120 return ret;
121
122 return sprintf(buf, "%ld\n", temperature);
123 }
124
125 static ssize_t
126 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
127 {
128 struct thermal_zone_device *tz = to_thermal_zone(dev);
129 enum thermal_device_mode mode;
130 int result;
131
132 if (!tz->ops->get_mode)
133 return -EPERM;
134
135 result = tz->ops->get_mode(tz, &mode);
136 if (result)
137 return result;
138
139 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
140 : "disabled");
141 }
142
143 static ssize_t
144 mode_store(struct device *dev, struct device_attribute *attr,
145 const char *buf, size_t count)
146 {
147 struct thermal_zone_device *tz = to_thermal_zone(dev);
148 int result;
149
150 if (!tz->ops->set_mode)
151 return -EPERM;
152
153 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
154 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
155 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
156 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
157 else
158 result = -EINVAL;
159
160 if (result)
161 return result;
162
163 return count;
164 }
165
166 static ssize_t
167 trip_point_type_show(struct device *dev, struct device_attribute *attr,
168 char *buf)
169 {
170 struct thermal_zone_device *tz = to_thermal_zone(dev);
171 enum thermal_trip_type type;
172 int trip, result;
173
174 if (!tz->ops->get_trip_type)
175 return -EPERM;
176
177 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
178 return -EINVAL;
179
180 result = tz->ops->get_trip_type(tz, trip, &type);
181 if (result)
182 return result;
183
184 switch (type) {
185 case THERMAL_TRIP_CRITICAL:
186 return sprintf(buf, "critical\n");
187 case THERMAL_TRIP_HOT:
188 return sprintf(buf, "hot\n");
189 case THERMAL_TRIP_PASSIVE:
190 return sprintf(buf, "passive\n");
191 case THERMAL_TRIP_ACTIVE:
192 return sprintf(buf, "active\n");
193 default:
194 return sprintf(buf, "unknown\n");
195 }
196 }
197
198 static ssize_t
199 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
200 char *buf)
201 {
202 struct thermal_zone_device *tz = to_thermal_zone(dev);
203 int trip, ret;
204 long temperature;
205
206 if (!tz->ops->get_trip_temp)
207 return -EPERM;
208
209 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
210 return -EINVAL;
211
212 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
213
214 if (ret)
215 return ret;
216
217 return sprintf(buf, "%ld\n", temperature);
218 }
219
220 static ssize_t
221 passive_store(struct device *dev, struct device_attribute *attr,
222 const char *buf, size_t count)
223 {
224 struct thermal_zone_device *tz = to_thermal_zone(dev);
225 struct thermal_cooling_device *cdev = NULL;
226 int state;
227
228 if (!sscanf(buf, "%d\n", &state))
229 return -EINVAL;
230
231 /* sanity check: values below 1000 millicelcius don't make sense
232 * and can cause the system to go into a thermal heart attack
233 */
234 if (state && state < 1000)
235 return -EINVAL;
236
237 if (state && !tz->forced_passive) {
238 mutex_lock(&thermal_list_lock);
239 list_for_each_entry(cdev, &thermal_cdev_list, node) {
240 if (!strncmp("Processor", cdev->type,
241 sizeof("Processor")))
242 thermal_zone_bind_cooling_device(tz,
243 THERMAL_TRIPS_NONE,
244 cdev);
245 }
246 mutex_unlock(&thermal_list_lock);
247 if (!tz->passive_delay)
248 tz->passive_delay = 1000;
249 } else if (!state && tz->forced_passive) {
250 mutex_lock(&thermal_list_lock);
251 list_for_each_entry(cdev, &thermal_cdev_list, node) {
252 if (!strncmp("Processor", cdev->type,
253 sizeof("Processor")))
254 thermal_zone_unbind_cooling_device(tz,
255 THERMAL_TRIPS_NONE,
256 cdev);
257 }
258 mutex_unlock(&thermal_list_lock);
259 tz->passive_delay = 0;
260 }
261
262 tz->tc1 = 1;
263 tz->tc2 = 1;
264
265 tz->forced_passive = state;
266
267 thermal_zone_device_update(tz);
268
269 return count;
270 }
271
272 static ssize_t
273 passive_show(struct device *dev, struct device_attribute *attr,
274 char *buf)
275 {
276 struct thermal_zone_device *tz = to_thermal_zone(dev);
277
278 return sprintf(buf, "%d\n", tz->forced_passive);
279 }
280
281 static DEVICE_ATTR(type, 0444, type_show, NULL);
282 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
283 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
284 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
285
286 static struct device_attribute trip_point_attrs[] = {
287 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
288 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
289 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
290 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
291 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
292 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
293 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
294 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
295 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
296 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
297 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
298 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
299 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
300 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
301 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
302 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
303 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
304 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
305 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
306 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
307 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
308 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
309 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
310 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
311 };
312
313 /* sys I/F for cooling device */
314 #define to_cooling_device(_dev) \
315 container_of(_dev, struct thermal_cooling_device, device)
316
317 static ssize_t
318 thermal_cooling_device_type_show(struct device *dev,
319 struct device_attribute *attr, char *buf)
320 {
321 struct thermal_cooling_device *cdev = to_cooling_device(dev);
322
323 return sprintf(buf, "%s\n", cdev->type);
324 }
325
326 static ssize_t
327 thermal_cooling_device_max_state_show(struct device *dev,
328 struct device_attribute *attr, char *buf)
329 {
330 struct thermal_cooling_device *cdev = to_cooling_device(dev);
331 unsigned long state;
332 int ret;
333
334 ret = cdev->ops->get_max_state(cdev, &state);
335 if (ret)
336 return ret;
337 return sprintf(buf, "%ld\n", state);
338 }
339
340 static ssize_t
341 thermal_cooling_device_cur_state_show(struct device *dev,
342 struct device_attribute *attr, char *buf)
343 {
344 struct thermal_cooling_device *cdev = to_cooling_device(dev);
345 unsigned long state;
346 int ret;
347
348 ret = cdev->ops->get_cur_state(cdev, &state);
349 if (ret)
350 return ret;
351 return sprintf(buf, "%ld\n", state);
352 }
353
354 static ssize_t
355 thermal_cooling_device_cur_state_store(struct device *dev,
356 struct device_attribute *attr,
357 const char *buf, size_t count)
358 {
359 struct thermal_cooling_device *cdev = to_cooling_device(dev);
360 unsigned long state;
361 int result;
362
363 if (!sscanf(buf, "%ld\n", &state))
364 return -EINVAL;
365
366 if ((long)state < 0)
367 return -EINVAL;
368
369 result = cdev->ops->set_cur_state(cdev, state);
370 if (result)
371 return result;
372 return count;
373 }
374
375 static struct device_attribute dev_attr_cdev_type =
376 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
377 static DEVICE_ATTR(max_state, 0444,
378 thermal_cooling_device_max_state_show, NULL);
379 static DEVICE_ATTR(cur_state, 0644,
380 thermal_cooling_device_cur_state_show,
381 thermal_cooling_device_cur_state_store);
382
383 static ssize_t
384 thermal_cooling_device_trip_point_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386 {
387 struct thermal_cooling_device_instance *instance;
388
389 instance =
390 container_of(attr, struct thermal_cooling_device_instance, attr);
391
392 if (instance->trip == THERMAL_TRIPS_NONE)
393 return sprintf(buf, "-1\n");
394 else
395 return sprintf(buf, "%d\n", instance->trip);
396 }
397
398 /* Device management */
399
400 #if defined(CONFIG_THERMAL_HWMON)
401
402 /* hwmon sys I/F */
403 #include <linux/hwmon.h>
404
405 /* thermal zone devices with the same type share one hwmon device */
406 struct thermal_hwmon_device {
407 char type[THERMAL_NAME_LENGTH];
408 struct device *device;
409 int count;
410 struct list_head tz_list;
411 struct list_head node;
412 };
413
414 struct thermal_hwmon_attr {
415 struct device_attribute attr;
416 char name[16];
417 };
418
419 /* one temperature input for each thermal zone */
420 struct thermal_hwmon_temp {
421 struct list_head hwmon_node;
422 struct thermal_zone_device *tz;
423 struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
424 struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
425 };
426
427 static LIST_HEAD(thermal_hwmon_list);
428
429 static ssize_t
430 name_show(struct device *dev, struct device_attribute *attr, char *buf)
431 {
432 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
433 return sprintf(buf, "%s\n", hwmon->type);
434 }
435 static DEVICE_ATTR(name, 0444, name_show, NULL);
436
437 static ssize_t
438 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
439 {
440 long temperature;
441 int ret;
442 struct thermal_hwmon_attr *hwmon_attr
443 = container_of(attr, struct thermal_hwmon_attr, attr);
444 struct thermal_hwmon_temp *temp
445 = container_of(hwmon_attr, struct thermal_hwmon_temp,
446 temp_input);
447 struct thermal_zone_device *tz = temp->tz;
448
449 ret = tz->ops->get_temp(tz, &temperature);
450
451 if (ret)
452 return ret;
453
454 return sprintf(buf, "%ld\n", temperature);
455 }
456
457 static ssize_t
458 temp_crit_show(struct device *dev, struct device_attribute *attr,
459 char *buf)
460 {
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_crit);
466 struct thermal_zone_device *tz = temp->tz;
467 long temperature;
468 int ret;
469
470 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
471 if (ret)
472 return ret;
473
474 return sprintf(buf, "%ld\n", temperature);
475 }
476
477
478 static struct thermal_hwmon_device *
479 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
480 {
481 struct thermal_hwmon_device *hwmon;
482
483 mutex_lock(&thermal_list_lock);
484 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
485 if (!strcmp(hwmon->type, tz->type)) {
486 mutex_unlock(&thermal_list_lock);
487 return hwmon;
488 }
489 mutex_unlock(&thermal_list_lock);
490
491 return NULL;
492 }
493
494 /* Find the temperature input matching a given thermal zone */
495 static struct thermal_hwmon_temp *
496 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
497 const struct thermal_zone_device *tz)
498 {
499 struct thermal_hwmon_temp *temp;
500
501 mutex_lock(&thermal_list_lock);
502 list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
503 if (temp->tz == tz) {
504 mutex_unlock(&thermal_list_lock);
505 return temp;
506 }
507 mutex_unlock(&thermal_list_lock);
508
509 return NULL;
510 }
511
512 static int
513 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
514 {
515 struct thermal_hwmon_device *hwmon;
516 struct thermal_hwmon_temp *temp;
517 int new_hwmon_device = 1;
518 int result;
519
520 hwmon = thermal_hwmon_lookup_by_type(tz);
521 if (hwmon) {
522 new_hwmon_device = 0;
523 goto register_sys_interface;
524 }
525
526 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
527 if (!hwmon)
528 return -ENOMEM;
529
530 INIT_LIST_HEAD(&hwmon->tz_list);
531 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
532 hwmon->device = hwmon_device_register(NULL);
533 if (IS_ERR(hwmon->device)) {
534 result = PTR_ERR(hwmon->device);
535 goto free_mem;
536 }
537 dev_set_drvdata(hwmon->device, hwmon);
538 result = device_create_file(hwmon->device, &dev_attr_name);
539 if (result)
540 goto free_mem;
541
542 register_sys_interface:
543 temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
544 if (!temp) {
545 result = -ENOMEM;
546 goto unregister_name;
547 }
548
549 temp->tz = tz;
550 hwmon->count++;
551
552 snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
553 "temp%d_input", hwmon->count);
554 temp->temp_input.attr.attr.name = temp->temp_input.name;
555 temp->temp_input.attr.attr.mode = 0444;
556 temp->temp_input.attr.show = temp_input_show;
557 sysfs_attr_init(&temp->temp_input.attr.attr);
558 result = device_create_file(hwmon->device, &temp->temp_input.attr);
559 if (result)
560 goto free_temp_mem;
561
562 if (tz->ops->get_crit_temp) {
563 unsigned long temperature;
564 if (!tz->ops->get_crit_temp(tz, &temperature)) {
565 snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
566 "temp%d_crit", hwmon->count);
567 temp->temp_crit.attr.attr.name = temp->temp_crit.name;
568 temp->temp_crit.attr.attr.mode = 0444;
569 temp->temp_crit.attr.show = temp_crit_show;
570 sysfs_attr_init(&temp->temp_crit.attr.attr);
571 result = device_create_file(hwmon->device,
572 &temp->temp_crit.attr);
573 if (result)
574 goto unregister_input;
575 }
576 }
577
578 mutex_lock(&thermal_list_lock);
579 if (new_hwmon_device)
580 list_add_tail(&hwmon->node, &thermal_hwmon_list);
581 list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
582 mutex_unlock(&thermal_list_lock);
583
584 return 0;
585
586 unregister_input:
587 device_remove_file(hwmon->device, &temp->temp_input.attr);
588 free_temp_mem:
589 kfree(temp);
590 unregister_name:
591 if (new_hwmon_device) {
592 device_remove_file(hwmon->device, &dev_attr_name);
593 hwmon_device_unregister(hwmon->device);
594 }
595 free_mem:
596 if (new_hwmon_device)
597 kfree(hwmon);
598
599 return result;
600 }
601
602 static void
603 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
604 {
605 struct thermal_hwmon_device *hwmon;
606 struct thermal_hwmon_temp *temp;
607
608 hwmon = thermal_hwmon_lookup_by_type(tz);
609 if (unlikely(!hwmon)) {
610 /* Should never happen... */
611 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
612 return;
613 }
614
615 temp = thermal_hwmon_lookup_temp(hwmon, tz);
616 if (unlikely(!temp)) {
617 /* Should never happen... */
618 dev_dbg(&tz->device, "temperature input lookup failed!\n");
619 return;
620 }
621
622 device_remove_file(hwmon->device, &temp->temp_input.attr);
623 if (tz->ops->get_crit_temp)
624 device_remove_file(hwmon->device, &temp->temp_crit.attr);
625
626 mutex_lock(&thermal_list_lock);
627 list_del(&temp->hwmon_node);
628 kfree(temp);
629 if (!list_empty(&hwmon->tz_list)) {
630 mutex_unlock(&thermal_list_lock);
631 return;
632 }
633 list_del(&hwmon->node);
634 mutex_unlock(&thermal_list_lock);
635
636 device_remove_file(hwmon->device, &dev_attr_name);
637 hwmon_device_unregister(hwmon->device);
638 kfree(hwmon);
639 }
640 #else
641 static int
642 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
643 {
644 return 0;
645 }
646
647 static void
648 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
649 {
650 }
651 #endif
652
653 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
654 int delay)
655 {
656 cancel_delayed_work(&(tz->poll_queue));
657
658 if (!delay)
659 return;
660
661 if (delay > 1000)
662 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
663 round_jiffies(msecs_to_jiffies(delay)));
664 else
665 queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
666 msecs_to_jiffies(delay));
667 }
668
669 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
670 int temp, int trip_temp, int trip)
671 {
672 int trend = 0;
673 struct thermal_cooling_device_instance *instance;
674 struct thermal_cooling_device *cdev;
675 long state, max_state;
676
677 /*
678 * Above Trip?
679 * -----------
680 * Calculate the thermal trend (using the passive cooling equation)
681 * and modify the performance limit for all passive cooling devices
682 * accordingly. Note that we assume symmetry.
683 */
684 if (temp >= trip_temp) {
685 tz->passive = true;
686
687 trend = (tz->tc1 * (temp - tz->last_temperature)) +
688 (tz->tc2 * (temp - trip_temp));
689
690 /* Heating up? */
691 if (trend > 0) {
692 list_for_each_entry(instance, &tz->cooling_devices,
693 node) {
694 if (instance->trip != trip)
695 continue;
696 cdev = instance->cdev;
697 cdev->ops->get_cur_state(cdev, &state);
698 cdev->ops->get_max_state(cdev, &max_state);
699 if (state++ < max_state)
700 cdev->ops->set_cur_state(cdev, state);
701 }
702 } else if (trend < 0) { /* Cooling off? */
703 list_for_each_entry(instance, &tz->cooling_devices,
704 node) {
705 if (instance->trip != trip)
706 continue;
707 cdev = instance->cdev;
708 cdev->ops->get_cur_state(cdev, &state);
709 cdev->ops->get_max_state(cdev, &max_state);
710 if (state > 0)
711 cdev->ops->set_cur_state(cdev, --state);
712 }
713 }
714 return;
715 }
716
717 /*
718 * Below Trip?
719 * -----------
720 * Implement passive cooling hysteresis to slowly increase performance
721 * and avoid thrashing around the passive trip point. Note that we
722 * assume symmetry.
723 */
724 list_for_each_entry(instance, &tz->cooling_devices, node) {
725 if (instance->trip != trip)
726 continue;
727 cdev = instance->cdev;
728 cdev->ops->get_cur_state(cdev, &state);
729 cdev->ops->get_max_state(cdev, &max_state);
730 if (state > 0)
731 cdev->ops->set_cur_state(cdev, --state);
732 if (state == 0)
733 tz->passive = false;
734 }
735 }
736
737 static void thermal_zone_device_check(struct work_struct *work)
738 {
739 struct thermal_zone_device *tz = container_of(work, struct
740 thermal_zone_device,
741 poll_queue.work);
742 thermal_zone_device_update(tz);
743 }
744
745 /**
746 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
747 * @tz: thermal zone device
748 * @trip: indicates which trip point the cooling devices is
749 * associated with in this thermal zone.
750 * @cdev: thermal cooling device
751 *
752 * This function is usually called in the thermal zone device .bind callback.
753 */
754 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
755 int trip,
756 struct thermal_cooling_device *cdev)
757 {
758 struct thermal_cooling_device_instance *dev;
759 struct thermal_cooling_device_instance *pos;
760 struct thermal_zone_device *pos1;
761 struct thermal_cooling_device *pos2;
762 int result;
763
764 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
765 return -EINVAL;
766
767 list_for_each_entry(pos1, &thermal_tz_list, node) {
768 if (pos1 == tz)
769 break;
770 }
771 list_for_each_entry(pos2, &thermal_cdev_list, node) {
772 if (pos2 == cdev)
773 break;
774 }
775
776 if (tz != pos1 || cdev != pos2)
777 return -EINVAL;
778
779 dev =
780 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
781 if (!dev)
782 return -ENOMEM;
783 dev->tz = tz;
784 dev->cdev = cdev;
785 dev->trip = trip;
786 result = get_idr(&tz->idr, &tz->lock, &dev->id);
787 if (result)
788 goto free_mem;
789
790 sprintf(dev->name, "cdev%d", dev->id);
791 result =
792 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
793 if (result)
794 goto release_idr;
795
796 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
797 sysfs_attr_init(&dev->attr.attr);
798 dev->attr.attr.name = dev->attr_name;
799 dev->attr.attr.mode = 0444;
800 dev->attr.show = thermal_cooling_device_trip_point_show;
801 result = device_create_file(&tz->device, &dev->attr);
802 if (result)
803 goto remove_symbol_link;
804
805 mutex_lock(&tz->lock);
806 list_for_each_entry(pos, &tz->cooling_devices, node)
807 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
808 result = -EEXIST;
809 break;
810 }
811 if (!result)
812 list_add_tail(&dev->node, &tz->cooling_devices);
813 mutex_unlock(&tz->lock);
814
815 if (!result)
816 return 0;
817
818 device_remove_file(&tz->device, &dev->attr);
819 remove_symbol_link:
820 sysfs_remove_link(&tz->device.kobj, dev->name);
821 release_idr:
822 release_idr(&tz->idr, &tz->lock, dev->id);
823 free_mem:
824 kfree(dev);
825 return result;
826 }
827 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
828
829 /**
830 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
831 * @tz: thermal zone device
832 * @trip: indicates which trip point the cooling devices is
833 * associated with in this thermal zone.
834 * @cdev: thermal cooling device
835 *
836 * This function is usually called in the thermal zone device .unbind callback.
837 */
838 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
839 int trip,
840 struct thermal_cooling_device *cdev)
841 {
842 struct thermal_cooling_device_instance *pos, *next;
843
844 mutex_lock(&tz->lock);
845 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
846 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
847 list_del(&pos->node);
848 mutex_unlock(&tz->lock);
849 goto unbind;
850 }
851 }
852 mutex_unlock(&tz->lock);
853
854 return -ENODEV;
855
856 unbind:
857 device_remove_file(&tz->device, &pos->attr);
858 sysfs_remove_link(&tz->device.kobj, pos->name);
859 release_idr(&tz->idr, &tz->lock, pos->id);
860 kfree(pos);
861 return 0;
862 }
863 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
864
865 static void thermal_release(struct device *dev)
866 {
867 struct thermal_zone_device *tz;
868 struct thermal_cooling_device *cdev;
869
870 if (!strncmp(dev_name(dev), "thermal_zone",
871 sizeof("thermal_zone") - 1)) {
872 tz = to_thermal_zone(dev);
873 kfree(tz);
874 } else {
875 cdev = to_cooling_device(dev);
876 kfree(cdev);
877 }
878 }
879
880 static struct class thermal_class = {
881 .name = "thermal",
882 .dev_release = thermal_release,
883 };
884
885 /**
886 * thermal_cooling_device_register - register a new thermal cooling device
887 * @type: the thermal cooling device type.
888 * @devdata: device private data.
889 * @ops: standard thermal cooling devices callbacks.
890 */
891 struct thermal_cooling_device *
892 thermal_cooling_device_register(char *type, void *devdata,
893 const struct thermal_cooling_device_ops *ops)
894 {
895 struct thermal_cooling_device *cdev;
896 struct thermal_zone_device *pos;
897 int result;
898
899 if (strlen(type) >= THERMAL_NAME_LENGTH)
900 return ERR_PTR(-EINVAL);
901
902 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
903 !ops->set_cur_state)
904 return ERR_PTR(-EINVAL);
905
906 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
907 if (!cdev)
908 return ERR_PTR(-ENOMEM);
909
910 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
911 if (result) {
912 kfree(cdev);
913 return ERR_PTR(result);
914 }
915
916 strcpy(cdev->type, type);
917 cdev->ops = ops;
918 cdev->device.class = &thermal_class;
919 cdev->devdata = devdata;
920 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
921 result = device_register(&cdev->device);
922 if (result) {
923 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
924 kfree(cdev);
925 return ERR_PTR(result);
926 }
927
928 /* sys I/F */
929 if (type) {
930 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
931 if (result)
932 goto unregister;
933 }
934
935 result = device_create_file(&cdev->device, &dev_attr_max_state);
936 if (result)
937 goto unregister;
938
939 result = device_create_file(&cdev->device, &dev_attr_cur_state);
940 if (result)
941 goto unregister;
942
943 mutex_lock(&thermal_list_lock);
944 list_add(&cdev->node, &thermal_cdev_list);
945 list_for_each_entry(pos, &thermal_tz_list, node) {
946 if (!pos->ops->bind)
947 continue;
948 result = pos->ops->bind(pos, cdev);
949 if (result)
950 break;
951
952 }
953 mutex_unlock(&thermal_list_lock);
954
955 if (!result)
956 return cdev;
957
958 unregister:
959 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
960 device_unregister(&cdev->device);
961 return ERR_PTR(result);
962 }
963 EXPORT_SYMBOL(thermal_cooling_device_register);
964
965 /**
966 * thermal_cooling_device_unregister - removes the registered thermal cooling device
967 * @cdev: the thermal cooling device to remove.
968 *
969 * thermal_cooling_device_unregister() must be called when the device is no
970 * longer needed.
971 */
972 void thermal_cooling_device_unregister(struct
973 thermal_cooling_device
974 *cdev)
975 {
976 struct thermal_zone_device *tz;
977 struct thermal_cooling_device *pos = NULL;
978
979 if (!cdev)
980 return;
981
982 mutex_lock(&thermal_list_lock);
983 list_for_each_entry(pos, &thermal_cdev_list, node)
984 if (pos == cdev)
985 break;
986 if (pos != cdev) {
987 /* thermal cooling device not found */
988 mutex_unlock(&thermal_list_lock);
989 return;
990 }
991 list_del(&cdev->node);
992 list_for_each_entry(tz, &thermal_tz_list, node) {
993 if (!tz->ops->unbind)
994 continue;
995 tz->ops->unbind(tz, cdev);
996 }
997 mutex_unlock(&thermal_list_lock);
998 if (cdev->type[0])
999 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1000 device_remove_file(&cdev->device, &dev_attr_max_state);
1001 device_remove_file(&cdev->device, &dev_attr_cur_state);
1002
1003 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1004 device_unregister(&cdev->device);
1005 return;
1006 }
1007 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1008
1009 /**
1010 * thermal_zone_device_update - force an update of a thermal zone's state
1011 * @ttz: the thermal zone to update
1012 */
1013
1014 void thermal_zone_device_update(struct thermal_zone_device *tz)
1015 {
1016 int count, ret = 0;
1017 long temp, trip_temp;
1018 enum thermal_trip_type trip_type;
1019 struct thermal_cooling_device_instance *instance;
1020 struct thermal_cooling_device *cdev;
1021
1022 mutex_lock(&tz->lock);
1023
1024 if (tz->ops->get_temp(tz, &temp)) {
1025 /* get_temp failed - retry it later */
1026 pr_warn("failed to read out thermal zone %d\n", tz->id);
1027 goto leave;
1028 }
1029
1030 for (count = 0; count < tz->trips; count++) {
1031 tz->ops->get_trip_type(tz, count, &trip_type);
1032 tz->ops->get_trip_temp(tz, count, &trip_temp);
1033
1034 switch (trip_type) {
1035 case THERMAL_TRIP_CRITICAL:
1036 if (temp >= trip_temp) {
1037 if (tz->ops->notify)
1038 ret = tz->ops->notify(tz, count,
1039 trip_type);
1040 if (!ret) {
1041 pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1042 temp/1000);
1043 orderly_poweroff(true);
1044 }
1045 }
1046 break;
1047 case THERMAL_TRIP_HOT:
1048 if (temp >= trip_temp)
1049 if (tz->ops->notify)
1050 tz->ops->notify(tz, count, trip_type);
1051 break;
1052 case THERMAL_TRIP_ACTIVE:
1053 list_for_each_entry(instance, &tz->cooling_devices,
1054 node) {
1055 if (instance->trip != count)
1056 continue;
1057
1058 cdev = instance->cdev;
1059
1060 if (temp >= trip_temp)
1061 cdev->ops->set_cur_state(cdev, 1);
1062 else
1063 cdev->ops->set_cur_state(cdev, 0);
1064 }
1065 break;
1066 case THERMAL_TRIP_PASSIVE:
1067 if (temp >= trip_temp || tz->passive)
1068 thermal_zone_device_passive(tz, temp,
1069 trip_temp, count);
1070 break;
1071 }
1072 }
1073
1074 if (tz->forced_passive)
1075 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1076 THERMAL_TRIPS_NONE);
1077
1078 tz->last_temperature = temp;
1079
1080 leave:
1081 if (tz->passive)
1082 thermal_zone_device_set_polling(tz, tz->passive_delay);
1083 else if (tz->polling_delay)
1084 thermal_zone_device_set_polling(tz, tz->polling_delay);
1085 else
1086 thermal_zone_device_set_polling(tz, 0);
1087 mutex_unlock(&tz->lock);
1088 }
1089 EXPORT_SYMBOL(thermal_zone_device_update);
1090
1091 /**
1092 * thermal_zone_device_register - register a new thermal zone device
1093 * @type: the thermal zone device type
1094 * @trips: the number of trip points the thermal zone support
1095 * @devdata: private device data
1096 * @ops: standard thermal zone device callbacks
1097 * @tc1: thermal coefficient 1 for passive calculations
1098 * @tc2: thermal coefficient 2 for passive calculations
1099 * @passive_delay: number of milliseconds to wait between polls when
1100 * performing passive cooling
1101 * @polling_delay: number of milliseconds to wait between polls when checking
1102 * whether trip points have been crossed (0 for interrupt
1103 * driven systems)
1104 *
1105 * thermal_zone_device_unregister() must be called when the device is no
1106 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1107 * section 11.1.5.1 of the ACPI specification 3.0.
1108 */
1109 struct thermal_zone_device *thermal_zone_device_register(char *type,
1110 int trips, void *devdata,
1111 const struct thermal_zone_device_ops *ops,
1112 int tc1, int tc2, int passive_delay, int polling_delay)
1113 {
1114 struct thermal_zone_device *tz;
1115 struct thermal_cooling_device *pos;
1116 enum thermal_trip_type trip_type;
1117 int result;
1118 int count;
1119 int passive = 0;
1120
1121 if (strlen(type) >= THERMAL_NAME_LENGTH)
1122 return ERR_PTR(-EINVAL);
1123
1124 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1125 return ERR_PTR(-EINVAL);
1126
1127 if (!ops || !ops->get_temp)
1128 return ERR_PTR(-EINVAL);
1129
1130 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1131 if (!tz)
1132 return ERR_PTR(-ENOMEM);
1133
1134 INIT_LIST_HEAD(&tz->cooling_devices);
1135 idr_init(&tz->idr);
1136 mutex_init(&tz->lock);
1137 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1138 if (result) {
1139 kfree(tz);
1140 return ERR_PTR(result);
1141 }
1142
1143 strcpy(tz->type, type);
1144 tz->ops = ops;
1145 tz->device.class = &thermal_class;
1146 tz->devdata = devdata;
1147 tz->trips = trips;
1148 tz->tc1 = tc1;
1149 tz->tc2 = tc2;
1150 tz->passive_delay = passive_delay;
1151 tz->polling_delay = polling_delay;
1152
1153 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1154 result = device_register(&tz->device);
1155 if (result) {
1156 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1157 kfree(tz);
1158 return ERR_PTR(result);
1159 }
1160
1161 /* sys I/F */
1162 if (type) {
1163 result = device_create_file(&tz->device, &dev_attr_type);
1164 if (result)
1165 goto unregister;
1166 }
1167
1168 result = device_create_file(&tz->device, &dev_attr_temp);
1169 if (result)
1170 goto unregister;
1171
1172 if (ops->get_mode) {
1173 result = device_create_file(&tz->device, &dev_attr_mode);
1174 if (result)
1175 goto unregister;
1176 }
1177
1178 for (count = 0; count < trips; count++) {
1179 result = device_create_file(&tz->device,
1180 &trip_point_attrs[count * 2]);
1181 if (result)
1182 break;
1183 result = device_create_file(&tz->device,
1184 &trip_point_attrs[count * 2 + 1]);
1185 if (result)
1186 goto unregister;
1187 tz->ops->get_trip_type(tz, count, &trip_type);
1188 if (trip_type == THERMAL_TRIP_PASSIVE)
1189 passive = 1;
1190 }
1191
1192 if (!passive)
1193 result = device_create_file(&tz->device,
1194 &dev_attr_passive);
1195
1196 if (result)
1197 goto unregister;
1198
1199 result = thermal_add_hwmon_sysfs(tz);
1200 if (result)
1201 goto unregister;
1202
1203 mutex_lock(&thermal_list_lock);
1204 list_add_tail(&tz->node, &thermal_tz_list);
1205 if (ops->bind)
1206 list_for_each_entry(pos, &thermal_cdev_list, node) {
1207 result = ops->bind(tz, pos);
1208 if (result)
1209 break;
1210 }
1211 mutex_unlock(&thermal_list_lock);
1212
1213 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1214
1215 thermal_zone_device_update(tz);
1216
1217 if (!result)
1218 return tz;
1219
1220 unregister:
1221 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1222 device_unregister(&tz->device);
1223 return ERR_PTR(result);
1224 }
1225 EXPORT_SYMBOL(thermal_zone_device_register);
1226
1227 /**
1228 * thermal_device_unregister - removes the registered thermal zone device
1229 * @tz: the thermal zone device to remove
1230 */
1231 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1232 {
1233 struct thermal_cooling_device *cdev;
1234 struct thermal_zone_device *pos = NULL;
1235 int count;
1236
1237 if (!tz)
1238 return;
1239
1240 mutex_lock(&thermal_list_lock);
1241 list_for_each_entry(pos, &thermal_tz_list, node)
1242 if (pos == tz)
1243 break;
1244 if (pos != tz) {
1245 /* thermal zone device not found */
1246 mutex_unlock(&thermal_list_lock);
1247 return;
1248 }
1249 list_del(&tz->node);
1250 if (tz->ops->unbind)
1251 list_for_each_entry(cdev, &thermal_cdev_list, node)
1252 tz->ops->unbind(tz, cdev);
1253 mutex_unlock(&thermal_list_lock);
1254
1255 thermal_zone_device_set_polling(tz, 0);
1256
1257 if (tz->type[0])
1258 device_remove_file(&tz->device, &dev_attr_type);
1259 device_remove_file(&tz->device, &dev_attr_temp);
1260 if (tz->ops->get_mode)
1261 device_remove_file(&tz->device, &dev_attr_mode);
1262
1263 for (count = 0; count < tz->trips; count++) {
1264 device_remove_file(&tz->device,
1265 &trip_point_attrs[count * 2]);
1266 device_remove_file(&tz->device,
1267 &trip_point_attrs[count * 2 + 1]);
1268 }
1269 thermal_remove_hwmon_sysfs(tz);
1270 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1271 idr_destroy(&tz->idr);
1272 mutex_destroy(&tz->lock);
1273 device_unregister(&tz->device);
1274 return;
1275 }
1276 EXPORT_SYMBOL(thermal_zone_device_unregister);
1277
1278 #ifdef CONFIG_NET
1279 static struct genl_family thermal_event_genl_family = {
1280 .id = GENL_ID_GENERATE,
1281 .name = THERMAL_GENL_FAMILY_NAME,
1282 .version = THERMAL_GENL_VERSION,
1283 .maxattr = THERMAL_GENL_ATTR_MAX,
1284 };
1285
1286 static struct genl_multicast_group thermal_event_mcgrp = {
1287 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1288 };
1289
1290 int thermal_generate_netlink_event(u32 orig, enum events event)
1291 {
1292 struct sk_buff *skb;
1293 struct nlattr *attr;
1294 struct thermal_genl_event *thermal_event;
1295 void *msg_header;
1296 int size;
1297 int result;
1298 static unsigned int thermal_event_seqnum;
1299
1300 /* allocate memory */
1301 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1302 nla_total_size(0);
1303
1304 skb = genlmsg_new(size, GFP_ATOMIC);
1305 if (!skb)
1306 return -ENOMEM;
1307
1308 /* add the genetlink message header */
1309 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1310 &thermal_event_genl_family, 0,
1311 THERMAL_GENL_CMD_EVENT);
1312 if (!msg_header) {
1313 nlmsg_free(skb);
1314 return -ENOMEM;
1315 }
1316
1317 /* fill the data */
1318 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1319 sizeof(struct thermal_genl_event));
1320
1321 if (!attr) {
1322 nlmsg_free(skb);
1323 return -EINVAL;
1324 }
1325
1326 thermal_event = nla_data(attr);
1327 if (!thermal_event) {
1328 nlmsg_free(skb);
1329 return -EINVAL;
1330 }
1331
1332 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1333
1334 thermal_event->orig = orig;
1335 thermal_event->event = event;
1336
1337 /* send multicast genetlink message */
1338 result = genlmsg_end(skb, msg_header);
1339 if (result < 0) {
1340 nlmsg_free(skb);
1341 return result;
1342 }
1343
1344 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1345 if (result)
1346 pr_info("failed to send netlink event:%d\n", result);
1347
1348 return result;
1349 }
1350 EXPORT_SYMBOL(thermal_generate_netlink_event);
1351
1352 static int genetlink_init(void)
1353 {
1354 int result;
1355
1356 result = genl_register_family(&thermal_event_genl_family);
1357 if (result)
1358 return result;
1359
1360 result = genl_register_mc_group(&thermal_event_genl_family,
1361 &thermal_event_mcgrp);
1362 if (result)
1363 genl_unregister_family(&thermal_event_genl_family);
1364 return result;
1365 }
1366
1367 static void genetlink_exit(void)
1368 {
1369 genl_unregister_family(&thermal_event_genl_family);
1370 }
1371 #else /* !CONFIG_NET */
1372 static inline int genetlink_init(void) { return 0; }
1373 static inline void genetlink_exit(void) {}
1374 #endif /* !CONFIG_NET */
1375
1376 static int __init thermal_init(void)
1377 {
1378 int result = 0;
1379
1380 result = class_register(&thermal_class);
1381 if (result) {
1382 idr_destroy(&thermal_tz_idr);
1383 idr_destroy(&thermal_cdev_idr);
1384 mutex_destroy(&thermal_idr_lock);
1385 mutex_destroy(&thermal_list_lock);
1386 return result;
1387 }
1388 result = genetlink_init();
1389 return result;
1390 }
1391
1392 static void __exit thermal_exit(void)
1393 {
1394 class_unregister(&thermal_class);
1395 idr_destroy(&thermal_tz_idr);
1396 idr_destroy(&thermal_cdev_idr);
1397 mutex_destroy(&thermal_idr_lock);
1398 mutex_destroy(&thermal_list_lock);
1399 genetlink_exit();
1400 }
1401
1402 fs_initcall(thermal_init);
1403 module_exit(thermal_exit);
Linux with added FPC-III support