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Kconfig: fix copy/paste-ism for dell-wmi-aio driver
[zen-stable.git] / drivers / thermal / thermal_sys.c
blobfc6f2a5bde01324675424b01da941e8718ccd259
1 /*
2 * thermal.c - Generic Thermal Management Sysfs support.
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/err.h>
29 #include <linux/slab.h>
30 #include <linux/kdev_t.h>
31 #include <linux/idr.h>
32 #include <linux/thermal.h>
33 #include <linux/spinlock.h>
34 #include <linux/reboot.h>
35 #include <net/netlink.h>
36 #include <net/genetlink.h>
37
38 MODULE_AUTHOR("Zhang Rui");
39 MODULE_DESCRIPTION("Generic thermal management sysfs support");
40 MODULE_LICENSE("GPL");
41
42 #define PREFIX "Thermal: "
43
44 struct thermal_cooling_device_instance {
45 int id;
46 char name[THERMAL_NAME_LENGTH];
47 struct thermal_zone_device *tz;
48 struct thermal_cooling_device *cdev;
49 int trip;
50 char attr_name[THERMAL_NAME_LENGTH];
51 struct device_attribute attr;
52 struct list_head node;
53 };
54
55 static DEFINE_IDR(thermal_tz_idr);
56 static DEFINE_IDR(thermal_cdev_idr);
57 static DEFINE_MUTEX(thermal_idr_lock);
58
59 static LIST_HEAD(thermal_tz_list);
60 static LIST_HEAD(thermal_cdev_list);
61 static DEFINE_MUTEX(thermal_list_lock);
62
63 static unsigned int thermal_event_seqnum;
64
65 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
66 {
67 int err;
68
69 again:
70 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
71 return -ENOMEM;
72
73 if (lock)
74 mutex_lock(lock);
75 err = idr_get_new(idr, NULL, id);
76 if (lock)
77 mutex_unlock(lock);
78 if (unlikely(err == -EAGAIN))
79 goto again;
80 else if (unlikely(err))
81 return err;
82
83 *id = *id & MAX_ID_MASK;
84 return 0;
85 }
86
87 static void release_idr(struct idr *idr, struct mutex *lock, int id)
88 {
89 if (lock)
90 mutex_lock(lock);
91 idr_remove(idr, id);
92 if (lock)
93 mutex_unlock(lock);
94 }
95
96 /* sys I/F for thermal zone */
97
98 #define to_thermal_zone(_dev) \
99 container_of(_dev, struct thermal_zone_device, device)
100
101 static ssize_t
102 type_show(struct device *dev, struct device_attribute *attr, char *buf)
103 {
104 struct thermal_zone_device *tz = to_thermal_zone(dev);
105
106 return sprintf(buf, "%s\n", tz->type);
107 }
108
109 static ssize_t
110 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
111 {
112 struct thermal_zone_device *tz = to_thermal_zone(dev);
113 long temperature;
114 int ret;
115
116 if (!tz->ops->get_temp)
117 return -EPERM;
118
119 ret = tz->ops->get_temp(tz, &temperature);
120
121 if (ret)
122 return ret;
123
124 return sprintf(buf, "%ld\n", temperature);
125 }
126
127 static ssize_t
128 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
129 {
130 struct thermal_zone_device *tz = to_thermal_zone(dev);
131 enum thermal_device_mode mode;
132 int result;
133
134 if (!tz->ops->get_mode)
135 return -EPERM;
136
137 result = tz->ops->get_mode(tz, &mode);
138 if (result)
139 return result;
140
141 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
142 : "disabled");
143 }
144
145 static ssize_t
146 mode_store(struct device *dev, struct device_attribute *attr,
147 const char *buf, size_t count)
148 {
149 struct thermal_zone_device *tz = to_thermal_zone(dev);
150 int result;
151
152 if (!tz->ops->set_mode)
153 return -EPERM;
154
155 if (!strncmp(buf, "enabled", sizeof("enabled")))
156 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
157 else if (!strncmp(buf, "disabled", sizeof("disabled")))
158 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
159 else
160 result = -EINVAL;
161
162 if (result)
163 return result;
164
165 return count;
166 }
167
168 static ssize_t
169 trip_point_type_show(struct device *dev, struct device_attribute *attr,
170 char *buf)
171 {
172 struct thermal_zone_device *tz = to_thermal_zone(dev);
173 enum thermal_trip_type type;
174 int trip, result;
175
176 if (!tz->ops->get_trip_type)
177 return -EPERM;
178
179 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
180 return -EINVAL;
181
182 result = tz->ops->get_trip_type(tz, trip, &type);
183 if (result)
184 return result;
185
186 switch (type) {
187 case THERMAL_TRIP_CRITICAL:
188 return sprintf(buf, "critical\n");
189 case THERMAL_TRIP_HOT:
190 return sprintf(buf, "hot\n");
191 case THERMAL_TRIP_PASSIVE:
192 return sprintf(buf, "passive\n");
193 case THERMAL_TRIP_ACTIVE:
194 return sprintf(buf, "active\n");
195 default:
196 return sprintf(buf, "unknown\n");
197 }
198 }
199
200 static ssize_t
201 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
202 char *buf)
203 {
204 struct thermal_zone_device *tz = to_thermal_zone(dev);
205 int trip, ret;
206 long temperature;
207
208 if (!tz->ops->get_trip_temp)
209 return -EPERM;
210
211 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
212 return -EINVAL;
213
214 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
215
216 if (ret)
217 return ret;
218
219 return sprintf(buf, "%ld\n", temperature);
220 }
221
222 static ssize_t
223 passive_store(struct device *dev, struct device_attribute *attr,
224 const char *buf, size_t count)
225 {
226 struct thermal_zone_device *tz = to_thermal_zone(dev);
227 struct thermal_cooling_device *cdev = NULL;
228 int state;
229
230 if (!sscanf(buf, "%d\n", &state))
231 return -EINVAL;
232
233 /* sanity check: values below 1000 millicelcius don't make sense
234 * and can cause the system to go into a thermal heart attack
235 */
236 if (state && state < 1000)
237 return -EINVAL;
238
239 if (state && !tz->forced_passive) {
240 mutex_lock(&thermal_list_lock);
241 list_for_each_entry(cdev, &thermal_cdev_list, node) {
242 if (!strncmp("Processor", cdev->type,
243 sizeof("Processor")))
244 thermal_zone_bind_cooling_device(tz,
245 THERMAL_TRIPS_NONE,
246 cdev);
247 }
248 mutex_unlock(&thermal_list_lock);
249 if (!tz->passive_delay)
250 tz->passive_delay = 1000;
251 } else if (!state && tz->forced_passive) {
252 mutex_lock(&thermal_list_lock);
253 list_for_each_entry(cdev, &thermal_cdev_list, node) {
254 if (!strncmp("Processor", cdev->type,
255 sizeof("Processor")))
256 thermal_zone_unbind_cooling_device(tz,
257 THERMAL_TRIPS_NONE,
258 cdev);
259 }
260 mutex_unlock(&thermal_list_lock);
261 tz->passive_delay = 0;
262 }
263
264 tz->tc1 = 1;
265 tz->tc2 = 1;
266
267 tz->forced_passive = state;
268
269 thermal_zone_device_update(tz);
270
271 return count;
272 }
273
274 static ssize_t
275 passive_show(struct device *dev, struct device_attribute *attr,
276 char *buf)
277 {
278 struct thermal_zone_device *tz = to_thermal_zone(dev);
279
280 return sprintf(buf, "%d\n", tz->forced_passive);
281 }
282
283 static DEVICE_ATTR(type, 0444, type_show, NULL);
284 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
285 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
286 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
287 passive_store);
288
289 static struct device_attribute trip_point_attrs[] = {
290 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
291 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
292 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
293 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
294 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
295 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
296 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
297 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
298 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
299 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
300 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
301 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
302 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
303 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
304 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
305 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
306 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
307 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
308 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
309 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
310 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
311 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
312 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
313 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
314 };
315
316 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
317 do { \
318 result = device_create_file(_dev, \
319 &trip_point_attrs[_index * 2]); \
320 if (result) \
321 break; \
322 result = device_create_file(_dev, \
323 &trip_point_attrs[_index * 2 + 1]); \
324 } while (0)
325
326 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
327 do { \
328 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
329 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
330 } while (0)
331
332 /* sys I/F for cooling device */
333 #define to_cooling_device(_dev) \
334 container_of(_dev, struct thermal_cooling_device, device)
335
336 static ssize_t
337 thermal_cooling_device_type_show(struct device *dev,
338 struct device_attribute *attr, char *buf)
339 {
340 struct thermal_cooling_device *cdev = to_cooling_device(dev);
341
342 return sprintf(buf, "%s\n", cdev->type);
343 }
344
345 static ssize_t
346 thermal_cooling_device_max_state_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348 {
349 struct thermal_cooling_device *cdev = to_cooling_device(dev);
350 unsigned long state;
351 int ret;
352
353 ret = cdev->ops->get_max_state(cdev, &state);
354 if (ret)
355 return ret;
356 return sprintf(buf, "%ld\n", state);
357 }
358
359 static ssize_t
360 thermal_cooling_device_cur_state_show(struct device *dev,
361 struct device_attribute *attr, char *buf)
362 {
363 struct thermal_cooling_device *cdev = to_cooling_device(dev);
364 unsigned long state;
365 int ret;
366
367 ret = cdev->ops->get_cur_state(cdev, &state);
368 if (ret)
369 return ret;
370 return sprintf(buf, "%ld\n", state);
371 }
372
373 static ssize_t
374 thermal_cooling_device_cur_state_store(struct device *dev,
375 struct device_attribute *attr,
376 const char *buf, size_t count)
377 {
378 struct thermal_cooling_device *cdev = to_cooling_device(dev);
379 unsigned long state;
380 int result;
381
382 if (!sscanf(buf, "%ld\n", &state))
383 return -EINVAL;
384
385 if ((long)state < 0)
386 return -EINVAL;
387
388 result = cdev->ops->set_cur_state(cdev, state);
389 if (result)
390 return result;
391 return count;
392 }
393
394 static struct device_attribute dev_attr_cdev_type =
395 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
396 static DEVICE_ATTR(max_state, 0444,
397 thermal_cooling_device_max_state_show, NULL);
398 static DEVICE_ATTR(cur_state, 0644,
399 thermal_cooling_device_cur_state_show,
400 thermal_cooling_device_cur_state_store);
401
402 static ssize_t
403 thermal_cooling_device_trip_point_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405 {
406 struct thermal_cooling_device_instance *instance;
407
408 instance =
409 container_of(attr, struct thermal_cooling_device_instance, attr);
410
411 if (instance->trip == THERMAL_TRIPS_NONE)
412 return sprintf(buf, "-1\n");
413 else
414 return sprintf(buf, "%d\n", instance->trip);
415 }
416
417 /* Device management */
418
419 #if defined(CONFIG_THERMAL_HWMON)
420
421 /* hwmon sys I/F */
422 #include <linux/hwmon.h>
423 static LIST_HEAD(thermal_hwmon_list);
424
425 static ssize_t
426 name_show(struct device *dev, struct device_attribute *attr, char *buf)
427 {
428 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
429 return sprintf(buf, "%s\n", hwmon->type);
430 }
431 static DEVICE_ATTR(name, 0444, name_show, NULL);
432
433 static ssize_t
434 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
435 {
436 long temperature;
437 int ret;
438 struct thermal_hwmon_attr *hwmon_attr
439 = container_of(attr, struct thermal_hwmon_attr, attr);
440 struct thermal_zone_device *tz
441 = container_of(hwmon_attr, struct thermal_zone_device,
442 temp_input);
443
444 ret = tz->ops->get_temp(tz, &temperature);
445
446 if (ret)
447 return ret;
448
449 return sprintf(buf, "%ld\n", temperature);
450 }
451
452 static ssize_t
453 temp_crit_show(struct device *dev, struct device_attribute *attr,
454 char *buf)
455 {
456 struct thermal_hwmon_attr *hwmon_attr
457 = container_of(attr, struct thermal_hwmon_attr, attr);
458 struct thermal_zone_device *tz
459 = container_of(hwmon_attr, struct thermal_zone_device,
460 temp_crit);
461 long temperature;
462 int ret;
463
464 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
465 if (ret)
466 return ret;
467
468 return sprintf(buf, "%ld\n", temperature);
469 }
470
471
472 static int
473 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
474 {
475 struct thermal_hwmon_device *hwmon;
476 int new_hwmon_device = 1;
477 int result;
478
479 mutex_lock(&thermal_list_lock);
480 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
481 if (!strcmp(hwmon->type, tz->type)) {
482 new_hwmon_device = 0;
483 mutex_unlock(&thermal_list_lock);
484 goto register_sys_interface;
485 }
486 mutex_unlock(&thermal_list_lock);
487
488 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
489 if (!hwmon)
490 return -ENOMEM;
491
492 INIT_LIST_HEAD(&hwmon->tz_list);
493 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
494 hwmon->device = hwmon_device_register(NULL);
495 if (IS_ERR(hwmon->device)) {
496 result = PTR_ERR(hwmon->device);
497 goto free_mem;
498 }
499 dev_set_drvdata(hwmon->device, hwmon);
500 result = device_create_file(hwmon->device, &dev_attr_name);
501 if (result)
502 goto unregister_hwmon_device;
503
504 register_sys_interface:
505 tz->hwmon = hwmon;
506 hwmon->count++;
507
508 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
509 "temp%d_input", hwmon->count);
510 tz->temp_input.attr.attr.name = tz->temp_input.name;
511 tz->temp_input.attr.attr.mode = 0444;
512 tz->temp_input.attr.show = temp_input_show;
513 sysfs_attr_init(&tz->temp_input.attr.attr);
514 result = device_create_file(hwmon->device, &tz->temp_input.attr);
515 if (result)
516 goto unregister_hwmon_device;
517
518 if (tz->ops->get_crit_temp) {
519 unsigned long temperature;
520 if (!tz->ops->get_crit_temp(tz, &temperature)) {
521 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
522 "temp%d_crit", hwmon->count);
523 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
524 tz->temp_crit.attr.attr.mode = 0444;
525 tz->temp_crit.attr.show = temp_crit_show;
526 sysfs_attr_init(&tz->temp_crit.attr.attr);
527 result = device_create_file(hwmon->device,
528 &tz->temp_crit.attr);
529 if (result)
530 goto unregister_hwmon_device;
531 }
532 }
533
534 mutex_lock(&thermal_list_lock);
535 if (new_hwmon_device)
536 list_add_tail(&hwmon->node, &thermal_hwmon_list);
537 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
538 mutex_unlock(&thermal_list_lock);
539
540 return 0;
541
542 unregister_hwmon_device:
543 device_remove_file(hwmon->device, &tz->temp_crit.attr);
544 device_remove_file(hwmon->device, &tz->temp_input.attr);
545 if (new_hwmon_device) {
546 device_remove_file(hwmon->device, &dev_attr_name);
547 hwmon_device_unregister(hwmon->device);
548 }
549 free_mem:
550 if (new_hwmon_device)
551 kfree(hwmon);
552
553 return result;
554 }
555
556 static void
557 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
558 {
559 struct thermal_hwmon_device *hwmon = tz->hwmon;
560
561 tz->hwmon = NULL;
562 device_remove_file(hwmon->device, &tz->temp_input.attr);
563 if (tz->ops->get_crit_temp)
564 device_remove_file(hwmon->device, &tz->temp_crit.attr);
565
566 mutex_lock(&thermal_list_lock);
567 list_del(&tz->hwmon_node);
568 if (!list_empty(&hwmon->tz_list)) {
569 mutex_unlock(&thermal_list_lock);
570 return;
571 }
572 list_del(&hwmon->node);
573 mutex_unlock(&thermal_list_lock);
574
575 device_remove_file(hwmon->device, &dev_attr_name);
576 hwmon_device_unregister(hwmon->device);
577 kfree(hwmon);
578 }
579 #else
580 static int
581 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
582 {
583 return 0;
584 }
585
586 static void
587 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
588 {
589 }
590 #endif
591
592 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
593 int delay)
594 {
595 cancel_delayed_work(&(tz->poll_queue));
596
597 if (!delay)
598 return;
599
600 if (delay > 1000)
601 schedule_delayed_work(&(tz->poll_queue),
602 round_jiffies(msecs_to_jiffies(delay)));
603 else
604 schedule_delayed_work(&(tz->poll_queue),
605 msecs_to_jiffies(delay));
606 }
607
608 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
609 int temp, int trip_temp, int trip)
610 {
611 int trend = 0;
612 struct thermal_cooling_device_instance *instance;
613 struct thermal_cooling_device *cdev;
614 long state, max_state;
615
616 /*
617 * Above Trip?
618 * -----------
619 * Calculate the thermal trend (using the passive cooling equation)
620 * and modify the performance limit for all passive cooling devices
621 * accordingly. Note that we assume symmetry.
622 */
623 if (temp >= trip_temp) {
624 tz->passive = true;
625
626 trend = (tz->tc1 * (temp - tz->last_temperature)) +
627 (tz->tc2 * (temp - trip_temp));
628
629 /* Heating up? */
630 if (trend > 0) {
631 list_for_each_entry(instance, &tz->cooling_devices,
632 node) {
633 if (instance->trip != trip)
634 continue;
635 cdev = instance->cdev;
636 cdev->ops->get_cur_state(cdev, &state);
637 cdev->ops->get_max_state(cdev, &max_state);
638 if (state++ < max_state)
639 cdev->ops->set_cur_state(cdev, state);
640 }
641 } else if (trend < 0) { /* Cooling off? */
642 list_for_each_entry(instance, &tz->cooling_devices,
643 node) {
644 if (instance->trip != trip)
645 continue;
646 cdev = instance->cdev;
647 cdev->ops->get_cur_state(cdev, &state);
648 cdev->ops->get_max_state(cdev, &max_state);
649 if (state > 0)
650 cdev->ops->set_cur_state(cdev, --state);
651 }
652 }
653 return;
654 }
655
656 /*
657 * Below Trip?
658 * -----------
659 * Implement passive cooling hysteresis to slowly increase performance
660 * and avoid thrashing around the passive trip point. Note that we
661 * assume symmetry.
662 */
663 list_for_each_entry(instance, &tz->cooling_devices, node) {
664 if (instance->trip != trip)
665 continue;
666 cdev = instance->cdev;
667 cdev->ops->get_cur_state(cdev, &state);
668 cdev->ops->get_max_state(cdev, &max_state);
669 if (state > 0)
670 cdev->ops->set_cur_state(cdev, --state);
671 if (state == 0)
672 tz->passive = false;
673 }
674 }
675
676 static void thermal_zone_device_check(struct work_struct *work)
677 {
678 struct thermal_zone_device *tz = container_of(work, struct
679 thermal_zone_device,
680 poll_queue.work);
681 thermal_zone_device_update(tz);
682 }
683
684 /**
685 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
686 * @tz: thermal zone device
687 * @trip: indicates which trip point the cooling devices is
688 * associated with in this thermal zone.
689 * @cdev: thermal cooling device
690 *
691 * This function is usually called in the thermal zone device .bind callback.
692 */
693 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
694 int trip,
695 struct thermal_cooling_device *cdev)
696 {
697 struct thermal_cooling_device_instance *dev;
698 struct thermal_cooling_device_instance *pos;
699 struct thermal_zone_device *pos1;
700 struct thermal_cooling_device *pos2;
701 int result;
702
703 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
704 return -EINVAL;
705
706 list_for_each_entry(pos1, &thermal_tz_list, node) {
707 if (pos1 == tz)
708 break;
709 }
710 list_for_each_entry(pos2, &thermal_cdev_list, node) {
711 if (pos2 == cdev)
712 break;
713 }
714
715 if (tz != pos1 || cdev != pos2)
716 return -EINVAL;
717
718 dev =
719 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
720 if (!dev)
721 return -ENOMEM;
722 dev->tz = tz;
723 dev->cdev = cdev;
724 dev->trip = trip;
725 result = get_idr(&tz->idr, &tz->lock, &dev->id);
726 if (result)
727 goto free_mem;
728
729 sprintf(dev->name, "cdev%d", dev->id);
730 result =
731 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
732 if (result)
733 goto release_idr;
734
735 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
736 sysfs_attr_init(&dev->attr.attr);
737 dev->attr.attr.name = dev->attr_name;
738 dev->attr.attr.mode = 0444;
739 dev->attr.show = thermal_cooling_device_trip_point_show;
740 result = device_create_file(&tz->device, &dev->attr);
741 if (result)
742 goto remove_symbol_link;
743
744 mutex_lock(&tz->lock);
745 list_for_each_entry(pos, &tz->cooling_devices, node)
746 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
747 result = -EEXIST;
748 break;
749 }
750 if (!result)
751 list_add_tail(&dev->node, &tz->cooling_devices);
752 mutex_unlock(&tz->lock);
753
754 if (!result)
755 return 0;
756
757 device_remove_file(&tz->device, &dev->attr);
758 remove_symbol_link:
759 sysfs_remove_link(&tz->device.kobj, dev->name);
760 release_idr:
761 release_idr(&tz->idr, &tz->lock, dev->id);
762 free_mem:
763 kfree(dev);
764 return result;
765 }
766
767 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
768
769 /**
770 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
771 * @tz: thermal zone device
772 * @trip: indicates which trip point the cooling devices is
773 * associated with in this thermal zone.
774 * @cdev: thermal cooling device
775 *
776 * This function is usually called in the thermal zone device .unbind callback.
777 */
778 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
779 int trip,
780 struct thermal_cooling_device *cdev)
781 {
782 struct thermal_cooling_device_instance *pos, *next;
783
784 mutex_lock(&tz->lock);
785 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
786 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
787 list_del(&pos->node);
788 mutex_unlock(&tz->lock);
789 goto unbind;
790 }
791 }
792 mutex_unlock(&tz->lock);
793
794 return -ENODEV;
795
796 unbind:
797 device_remove_file(&tz->device, &pos->attr);
798 sysfs_remove_link(&tz->device.kobj, pos->name);
799 release_idr(&tz->idr, &tz->lock, pos->id);
800 kfree(pos);
801 return 0;
802 }
803
804 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
805
806 static void thermal_release(struct device *dev)
807 {
808 struct thermal_zone_device *tz;
809 struct thermal_cooling_device *cdev;
810
811 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
812 tz = to_thermal_zone(dev);
813 kfree(tz);
814 } else {
815 cdev = to_cooling_device(dev);
816 kfree(cdev);
817 }
818 }
819
820 static struct class thermal_class = {
821 .name = "thermal",
822 .dev_release = thermal_release,
823 };
824
825 /**
826 * thermal_cooling_device_register - register a new thermal cooling device
827 * @type: the thermal cooling device type.
828 * @devdata: device private data.
829 * @ops: standard thermal cooling devices callbacks.
830 */
831 struct thermal_cooling_device *thermal_cooling_device_register(
832 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
833 {
834 struct thermal_cooling_device *cdev;
835 struct thermal_zone_device *pos;
836 int result;
837
838 if (strlen(type) >= THERMAL_NAME_LENGTH)
839 return ERR_PTR(-EINVAL);
840
841 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
842 !ops->set_cur_state)
843 return ERR_PTR(-EINVAL);
844
845 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
846 if (!cdev)
847 return ERR_PTR(-ENOMEM);
848
849 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
850 if (result) {
851 kfree(cdev);
852 return ERR_PTR(result);
853 }
854
855 strcpy(cdev->type, type);
856 cdev->ops = ops;
857 cdev->device.class = &thermal_class;
858 cdev->devdata = devdata;
859 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
860 result = device_register(&cdev->device);
861 if (result) {
862 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
863 kfree(cdev);
864 return ERR_PTR(result);
865 }
866
867 /* sys I/F */
868 if (type) {
869 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
870 if (result)
871 goto unregister;
872 }
873
874 result = device_create_file(&cdev->device, &dev_attr_max_state);
875 if (result)
876 goto unregister;
877
878 result = device_create_file(&cdev->device, &dev_attr_cur_state);
879 if (result)
880 goto unregister;
881
882 mutex_lock(&thermal_list_lock);
883 list_add(&cdev->node, &thermal_cdev_list);
884 list_for_each_entry(pos, &thermal_tz_list, node) {
885 if (!pos->ops->bind)
886 continue;
887 result = pos->ops->bind(pos, cdev);
888 if (result)
889 break;
890
891 }
892 mutex_unlock(&thermal_list_lock);
893
894 if (!result)
895 return cdev;
896
897 unregister:
898 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
899 device_unregister(&cdev->device);
900 return ERR_PTR(result);
901 }
902
903 EXPORT_SYMBOL(thermal_cooling_device_register);
904
905 /**
906 * thermal_cooling_device_unregister - removes the registered thermal cooling device
907 * @cdev: the thermal cooling device to remove.
908 *
909 * thermal_cooling_device_unregister() must be called when the device is no
910 * longer needed.
911 */
912 void thermal_cooling_device_unregister(struct
913 thermal_cooling_device
914 *cdev)
915 {
916 struct thermal_zone_device *tz;
917 struct thermal_cooling_device *pos = NULL;
918
919 if (!cdev)
920 return;
921
922 mutex_lock(&thermal_list_lock);
923 list_for_each_entry(pos, &thermal_cdev_list, node)
924 if (pos == cdev)
925 break;
926 if (pos != cdev) {
927 /* thermal cooling device not found */
928 mutex_unlock(&thermal_list_lock);
929 return;
930 }
931 list_del(&cdev->node);
932 list_for_each_entry(tz, &thermal_tz_list, node) {
933 if (!tz->ops->unbind)
934 continue;
935 tz->ops->unbind(tz, cdev);
936 }
937 mutex_unlock(&thermal_list_lock);
938 if (cdev->type[0])
939 device_remove_file(&cdev->device, &dev_attr_cdev_type);
940 device_remove_file(&cdev->device, &dev_attr_max_state);
941 device_remove_file(&cdev->device, &dev_attr_cur_state);
942
943 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
944 device_unregister(&cdev->device);
945 return;
946 }
947
948 EXPORT_SYMBOL(thermal_cooling_device_unregister);
949
950 /**
951 * thermal_zone_device_update - force an update of a thermal zone's state
952 * @ttz: the thermal zone to update
953 */
954
955 void thermal_zone_device_update(struct thermal_zone_device *tz)
956 {
957 int count, ret = 0;
958 long temp, trip_temp;
959 enum thermal_trip_type trip_type;
960 struct thermal_cooling_device_instance *instance;
961 struct thermal_cooling_device *cdev;
962
963 mutex_lock(&tz->lock);
964
965 if (tz->ops->get_temp(tz, &temp)) {
966 /* get_temp failed - retry it later */
967 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
968 "%d\n", tz->id);
969 goto leave;
970 }
971
972 for (count = 0; count < tz->trips; count++) {
973 tz->ops->get_trip_type(tz, count, &trip_type);
974 tz->ops->get_trip_temp(tz, count, &trip_temp);
975
976 switch (trip_type) {
977 case THERMAL_TRIP_CRITICAL:
978 if (temp >= trip_temp) {
979 if (tz->ops->notify)
980 ret = tz->ops->notify(tz, count,
981 trip_type);
982 if (!ret) {
983 printk(KERN_EMERG
984 "Critical temperature reached (%ld C), shutting down.\n",
985 temp/1000);
986 orderly_poweroff(true);
987 }
988 }
989 break;
990 case THERMAL_TRIP_HOT:
991 if (temp >= trip_temp)
992 if (tz->ops->notify)
993 tz->ops->notify(tz, count, trip_type);
994 break;
995 case THERMAL_TRIP_ACTIVE:
996 list_for_each_entry(instance, &tz->cooling_devices,
997 node) {
998 if (instance->trip != count)
999 continue;
1000
1001 cdev = instance->cdev;
1002
1003 if (temp >= trip_temp)
1004 cdev->ops->set_cur_state(cdev, 1);
1005 else
1006 cdev->ops->set_cur_state(cdev, 0);
1007 }
1008 break;
1009 case THERMAL_TRIP_PASSIVE:
1010 if (temp >= trip_temp || tz->passive)
1011 thermal_zone_device_passive(tz, temp,
1012 trip_temp, count);
1013 break;
1014 }
1015 }
1016
1017 if (tz->forced_passive)
1018 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1019 THERMAL_TRIPS_NONE);
1020
1021 tz->last_temperature = temp;
1022
1023 leave:
1024 if (tz->passive)
1025 thermal_zone_device_set_polling(tz, tz->passive_delay);
1026 else if (tz->polling_delay)
1027 thermal_zone_device_set_polling(tz, tz->polling_delay);
1028 else
1029 thermal_zone_device_set_polling(tz, 0);
1030 mutex_unlock(&tz->lock);
1031 }
1032 EXPORT_SYMBOL(thermal_zone_device_update);
1033
1034 /**
1035 * thermal_zone_device_register - register a new thermal zone device
1036 * @type: the thermal zone device type
1037 * @trips: the number of trip points the thermal zone support
1038 * @devdata: private device data
1039 * @ops: standard thermal zone device callbacks
1040 * @tc1: thermal coefficient 1 for passive calculations
1041 * @tc2: thermal coefficient 2 for passive calculations
1042 * @passive_delay: number of milliseconds to wait between polls when
1043 * performing passive cooling
1044 * @polling_delay: number of milliseconds to wait between polls when checking
1045 * whether trip points have been crossed (0 for interrupt
1046 * driven systems)
1047 *
1048 * thermal_zone_device_unregister() must be called when the device is no
1049 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1050 * section 11.1.5.1 of the ACPI specification 3.0.
1051 */
1052 struct thermal_zone_device *thermal_zone_device_register(char *type,
1053 int trips, void *devdata,
1054 const struct thermal_zone_device_ops *ops,
1055 int tc1, int tc2, int passive_delay, int polling_delay)
1056 {
1057 struct thermal_zone_device *tz;
1058 struct thermal_cooling_device *pos;
1059 enum thermal_trip_type trip_type;
1060 int result;
1061 int count;
1062 int passive = 0;
1063
1064 if (strlen(type) >= THERMAL_NAME_LENGTH)
1065 return ERR_PTR(-EINVAL);
1066
1067 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1068 return ERR_PTR(-EINVAL);
1069
1070 if (!ops || !ops->get_temp)
1071 return ERR_PTR(-EINVAL);
1072
1073 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1074 if (!tz)
1075 return ERR_PTR(-ENOMEM);
1076
1077 INIT_LIST_HEAD(&tz->cooling_devices);
1078 idr_init(&tz->idr);
1079 mutex_init(&tz->lock);
1080 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1081 if (result) {
1082 kfree(tz);
1083 return ERR_PTR(result);
1084 }
1085
1086 strcpy(tz->type, type);
1087 tz->ops = ops;
1088 tz->device.class = &thermal_class;
1089 tz->devdata = devdata;
1090 tz->trips = trips;
1091 tz->tc1 = tc1;
1092 tz->tc2 = tc2;
1093 tz->passive_delay = passive_delay;
1094 tz->polling_delay = polling_delay;
1095
1096 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1097 result = device_register(&tz->device);
1098 if (result) {
1099 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1100 kfree(tz);
1101 return ERR_PTR(result);
1102 }
1103
1104 /* sys I/F */
1105 if (type) {
1106 result = device_create_file(&tz->device, &dev_attr_type);
1107 if (result)
1108 goto unregister;
1109 }
1110
1111 result = device_create_file(&tz->device, &dev_attr_temp);
1112 if (result)
1113 goto unregister;
1114
1115 if (ops->get_mode) {
1116 result = device_create_file(&tz->device, &dev_attr_mode);
1117 if (result)
1118 goto unregister;
1119 }
1120
1121 for (count = 0; count < trips; count++) {
1122 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1123 if (result)
1124 goto unregister;
1125 tz->ops->get_trip_type(tz, count, &trip_type);
1126 if (trip_type == THERMAL_TRIP_PASSIVE)
1127 passive = 1;
1128 }
1129
1130 if (!passive)
1131 result = device_create_file(&tz->device,
1132 &dev_attr_passive);
1133
1134 if (result)
1135 goto unregister;
1136
1137 result = thermal_add_hwmon_sysfs(tz);
1138 if (result)
1139 goto unregister;
1140
1141 mutex_lock(&thermal_list_lock);
1142 list_add_tail(&tz->node, &thermal_tz_list);
1143 if (ops->bind)
1144 list_for_each_entry(pos, &thermal_cdev_list, node) {
1145 result = ops->bind(tz, pos);
1146 if (result)
1147 break;
1148 }
1149 mutex_unlock(&thermal_list_lock);
1150
1151 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1152
1153 thermal_zone_device_update(tz);
1154
1155 if (!result)
1156 return tz;
1157
1158 unregister:
1159 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1160 device_unregister(&tz->device);
1161 return ERR_PTR(result);
1162 }
1163
1164 EXPORT_SYMBOL(thermal_zone_device_register);
1165
1166 /**
1167 * thermal_device_unregister - removes the registered thermal zone device
1168 * @tz: the thermal zone device to remove
1169 */
1170 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1171 {
1172 struct thermal_cooling_device *cdev;
1173 struct thermal_zone_device *pos = NULL;
1174 int count;
1175
1176 if (!tz)
1177 return;
1178
1179 mutex_lock(&thermal_list_lock);
1180 list_for_each_entry(pos, &thermal_tz_list, node)
1181 if (pos == tz)
1182 break;
1183 if (pos != tz) {
1184 /* thermal zone device not found */
1185 mutex_unlock(&thermal_list_lock);
1186 return;
1187 }
1188 list_del(&tz->node);
1189 if (tz->ops->unbind)
1190 list_for_each_entry(cdev, &thermal_cdev_list, node)
1191 tz->ops->unbind(tz, cdev);
1192 mutex_unlock(&thermal_list_lock);
1193
1194 thermal_zone_device_set_polling(tz, 0);
1195
1196 if (tz->type[0])
1197 device_remove_file(&tz->device, &dev_attr_type);
1198 device_remove_file(&tz->device, &dev_attr_temp);
1199 if (tz->ops->get_mode)
1200 device_remove_file(&tz->device, &dev_attr_mode);
1201
1202 for (count = 0; count < tz->trips; count++)
1203 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1204
1205 thermal_remove_hwmon_sysfs(tz);
1206 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1207 idr_destroy(&tz->idr);
1208 mutex_destroy(&tz->lock);
1209 device_unregister(&tz->device);
1210 return;
1211 }
1212
1213 EXPORT_SYMBOL(thermal_zone_device_unregister);
1214
1215 #ifdef CONFIG_NET
1216 static struct genl_family thermal_event_genl_family = {
1217 .id = GENL_ID_GENERATE,
1218 .name = THERMAL_GENL_FAMILY_NAME,
1219 .version = THERMAL_GENL_VERSION,
1220 .maxattr = THERMAL_GENL_ATTR_MAX,
1221 };
1222
1223 static struct genl_multicast_group thermal_event_mcgrp = {
1224 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1225 };
1226
1227 int generate_netlink_event(u32 orig, enum events event)
1228 {
1229 struct sk_buff *skb;
1230 struct nlattr *attr;
1231 struct thermal_genl_event *thermal_event;
1232 void *msg_header;
1233 int size;
1234 int result;
1235
1236 /* allocate memory */
1237 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1238 nla_total_size(0);
1239
1240 skb = genlmsg_new(size, GFP_ATOMIC);
1241 if (!skb)
1242 return -ENOMEM;
1243
1244 /* add the genetlink message header */
1245 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1246 &thermal_event_genl_family, 0,
1247 THERMAL_GENL_CMD_EVENT);
1248 if (!msg_header) {
1249 nlmsg_free(skb);
1250 return -ENOMEM;
1251 }
1252
1253 /* fill the data */
1254 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1255 sizeof(struct thermal_genl_event));
1256
1257 if (!attr) {
1258 nlmsg_free(skb);
1259 return -EINVAL;
1260 }
1261
1262 thermal_event = nla_data(attr);
1263 if (!thermal_event) {
1264 nlmsg_free(skb);
1265 return -EINVAL;
1266 }
1267
1268 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1269
1270 thermal_event->orig = orig;
1271 thermal_event->event = event;
1272
1273 /* send multicast genetlink message */
1274 result = genlmsg_end(skb, msg_header);
1275 if (result < 0) {
1276 nlmsg_free(skb);
1277 return result;
1278 }
1279
1280 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1281 if (result)
1282 printk(KERN_INFO "failed to send netlink event:%d", result);
1283
1284 return result;
1285 }
1286 EXPORT_SYMBOL(generate_netlink_event);
1287
1288 static int genetlink_init(void)
1289 {
1290 int result;
1291
1292 result = genl_register_family(&thermal_event_genl_family);
1293 if (result)
1294 return result;
1295
1296 result = genl_register_mc_group(&thermal_event_genl_family,
1297 &thermal_event_mcgrp);
1298 if (result)
1299 genl_unregister_family(&thermal_event_genl_family);
1300 return result;
1301 }
1302
1303 static void genetlink_exit(void)
1304 {
1305 genl_unregister_family(&thermal_event_genl_family);
1306 }
1307 #else /* !CONFIG_NET */
1308 static inline int genetlink_init(void) { return 0; }
1309 static inline void genetlink_exit(void) {}
1310 #endif /* !CONFIG_NET */
1311
1312 static int __init thermal_init(void)
1313 {
1314 int result = 0;
1315
1316 result = class_register(&thermal_class);
1317 if (result) {
1318 idr_destroy(&thermal_tz_idr);
1319 idr_destroy(&thermal_cdev_idr);
1320 mutex_destroy(&thermal_idr_lock);
1321 mutex_destroy(&thermal_list_lock);
1322 }
1323 result = genetlink_init();
1324 return result;
1325 }
1326
1327 static void __exit thermal_exit(void)
1328 {
1329 class_unregister(&thermal_class);
1330 idr_destroy(&thermal_tz_idr);
1331 idr_destroy(&thermal_cdev_idr);
1332 mutex_destroy(&thermal_idr_lock);
1333 mutex_destroy(&thermal_list_lock);
1334 genetlink_exit();
1335 }
1336
1337 fs_initcall(thermal_init);
1338 module_exit(thermal_exit);