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net: sh_eth: remove almost #ifdef of SH7763
[linux/fpc-iii.git] / drivers / thermal / thermal_sys.c
blob713b7ea4a60709e89e164fd4765e75e5397ed57f
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 device_remove_file(hwmon->device, &tz->temp_crit.attr);
564
565 mutex_lock(&thermal_list_lock);
566 list_del(&tz->hwmon_node);
567 if (!list_empty(&hwmon->tz_list)) {
568 mutex_unlock(&thermal_list_lock);
569 return;
570 }
571 list_del(&hwmon->node);
572 mutex_unlock(&thermal_list_lock);
573
574 device_remove_file(hwmon->device, &dev_attr_name);
575 hwmon_device_unregister(hwmon->device);
576 kfree(hwmon);
577 }
578 #else
579 static int
580 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
581 {
582 return 0;
583 }
584
585 static void
586 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
587 {
588 }
589 #endif
590
591 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
592 int delay)
593 {
594 cancel_delayed_work(&(tz->poll_queue));
595
596 if (!delay)
597 return;
598
599 if (delay > 1000)
600 schedule_delayed_work(&(tz->poll_queue),
601 round_jiffies(msecs_to_jiffies(delay)));
602 else
603 schedule_delayed_work(&(tz->poll_queue),
604 msecs_to_jiffies(delay));
605 }
606
607 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
608 int temp, int trip_temp, int trip)
609 {
610 int trend = 0;
611 struct thermal_cooling_device_instance *instance;
612 struct thermal_cooling_device *cdev;
613 long state, max_state;
614
615 /*
616 * Above Trip?
617 * -----------
618 * Calculate the thermal trend (using the passive cooling equation)
619 * and modify the performance limit for all passive cooling devices
620 * accordingly. Note that we assume symmetry.
621 */
622 if (temp >= trip_temp) {
623 tz->passive = true;
624
625 trend = (tz->tc1 * (temp - tz->last_temperature)) +
626 (tz->tc2 * (temp - trip_temp));
627
628 /* Heating up? */
629 if (trend > 0) {
630 list_for_each_entry(instance, &tz->cooling_devices,
631 node) {
632 if (instance->trip != trip)
633 continue;
634 cdev = instance->cdev;
635 cdev->ops->get_cur_state(cdev, &state);
636 cdev->ops->get_max_state(cdev, &max_state);
637 if (state++ < max_state)
638 cdev->ops->set_cur_state(cdev, state);
639 }
640 } else if (trend < 0) { /* Cooling off? */
641 list_for_each_entry(instance, &tz->cooling_devices,
642 node) {
643 if (instance->trip != trip)
644 continue;
645 cdev = instance->cdev;
646 cdev->ops->get_cur_state(cdev, &state);
647 cdev->ops->get_max_state(cdev, &max_state);
648 if (state > 0)
649 cdev->ops->set_cur_state(cdev, --state);
650 }
651 }
652 return;
653 }
654
655 /*
656 * Below Trip?
657 * -----------
658 * Implement passive cooling hysteresis to slowly increase performance
659 * and avoid thrashing around the passive trip point. Note that we
660 * assume symmetry.
661 */
662 list_for_each_entry(instance, &tz->cooling_devices, node) {
663 if (instance->trip != trip)
664 continue;
665 cdev = instance->cdev;
666 cdev->ops->get_cur_state(cdev, &state);
667 cdev->ops->get_max_state(cdev, &max_state);
668 if (state > 0)
669 cdev->ops->set_cur_state(cdev, --state);
670 if (state == 0)
671 tz->passive = false;
672 }
673 }
674
675 static void thermal_zone_device_check(struct work_struct *work)
676 {
677 struct thermal_zone_device *tz = container_of(work, struct
678 thermal_zone_device,
679 poll_queue.work);
680 thermal_zone_device_update(tz);
681 }
682
683 /**
684 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
685 * @tz: thermal zone device
686 * @trip: indicates which trip point the cooling devices is
687 * associated with in this thermal zone.
688 * @cdev: thermal cooling device
689 *
690 * This function is usually called in the thermal zone device .bind callback.
691 */
692 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
693 int trip,
694 struct thermal_cooling_device *cdev)
695 {
696 struct thermal_cooling_device_instance *dev;
697 struct thermal_cooling_device_instance *pos;
698 struct thermal_zone_device *pos1;
699 struct thermal_cooling_device *pos2;
700 int result;
701
702 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
703 return -EINVAL;
704
705 list_for_each_entry(pos1, &thermal_tz_list, node) {
706 if (pos1 == tz)
707 break;
708 }
709 list_for_each_entry(pos2, &thermal_cdev_list, node) {
710 if (pos2 == cdev)
711 break;
712 }
713
714 if (tz != pos1 || cdev != pos2)
715 return -EINVAL;
716
717 dev =
718 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
719 if (!dev)
720 return -ENOMEM;
721 dev->tz = tz;
722 dev->cdev = cdev;
723 dev->trip = trip;
724 result = get_idr(&tz->idr, &tz->lock, &dev->id);
725 if (result)
726 goto free_mem;
727
728 sprintf(dev->name, "cdev%d", dev->id);
729 result =
730 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
731 if (result)
732 goto release_idr;
733
734 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
735 sysfs_attr_init(&dev->attr.attr);
736 dev->attr.attr.name = dev->attr_name;
737 dev->attr.attr.mode = 0444;
738 dev->attr.show = thermal_cooling_device_trip_point_show;
739 result = device_create_file(&tz->device, &dev->attr);
740 if (result)
741 goto remove_symbol_link;
742
743 mutex_lock(&tz->lock);
744 list_for_each_entry(pos, &tz->cooling_devices, node)
745 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
746 result = -EEXIST;
747 break;
748 }
749 if (!result)
750 list_add_tail(&dev->node, &tz->cooling_devices);
751 mutex_unlock(&tz->lock);
752
753 if (!result)
754 return 0;
755
756 device_remove_file(&tz->device, &dev->attr);
757 remove_symbol_link:
758 sysfs_remove_link(&tz->device.kobj, dev->name);
759 release_idr:
760 release_idr(&tz->idr, &tz->lock, dev->id);
761 free_mem:
762 kfree(dev);
763 return result;
764 }
765
766 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
767
768 /**
769 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
770 * @tz: thermal zone device
771 * @trip: indicates which trip point the cooling devices is
772 * associated with in this thermal zone.
773 * @cdev: thermal cooling device
774 *
775 * This function is usually called in the thermal zone device .unbind callback.
776 */
777 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
778 int trip,
779 struct thermal_cooling_device *cdev)
780 {
781 struct thermal_cooling_device_instance *pos, *next;
782
783 mutex_lock(&tz->lock);
784 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
785 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
786 list_del(&pos->node);
787 mutex_unlock(&tz->lock);
788 goto unbind;
789 }
790 }
791 mutex_unlock(&tz->lock);
792
793 return -ENODEV;
794
795 unbind:
796 device_remove_file(&tz->device, &pos->attr);
797 sysfs_remove_link(&tz->device.kobj, pos->name);
798 release_idr(&tz->idr, &tz->lock, pos->id);
799 kfree(pos);
800 return 0;
801 }
802
803 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
804
805 static void thermal_release(struct device *dev)
806 {
807 struct thermal_zone_device *tz;
808 struct thermal_cooling_device *cdev;
809
810 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
811 tz = to_thermal_zone(dev);
812 kfree(tz);
813 } else {
814 cdev = to_cooling_device(dev);
815 kfree(cdev);
816 }
817 }
818
819 static struct class thermal_class = {
820 .name = "thermal",
821 .dev_release = thermal_release,
822 };
823
824 /**
825 * thermal_cooling_device_register - register a new thermal cooling device
826 * @type: the thermal cooling device type.
827 * @devdata: device private data.
828 * @ops: standard thermal cooling devices callbacks.
829 */
830 struct thermal_cooling_device *thermal_cooling_device_register(
831 char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
832 {
833 struct thermal_cooling_device *cdev;
834 struct thermal_zone_device *pos;
835 int result;
836
837 if (strlen(type) >= THERMAL_NAME_LENGTH)
838 return ERR_PTR(-EINVAL);
839
840 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
841 !ops->set_cur_state)
842 return ERR_PTR(-EINVAL);
843
844 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
845 if (!cdev)
846 return ERR_PTR(-ENOMEM);
847
848 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
849 if (result) {
850 kfree(cdev);
851 return ERR_PTR(result);
852 }
853
854 strcpy(cdev->type, type);
855 cdev->ops = ops;
856 cdev->device.class = &thermal_class;
857 cdev->devdata = devdata;
858 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
859 result = device_register(&cdev->device);
860 if (result) {
861 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
862 kfree(cdev);
863 return ERR_PTR(result);
864 }
865
866 /* sys I/F */
867 if (type) {
868 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
869 if (result)
870 goto unregister;
871 }
872
873 result = device_create_file(&cdev->device, &dev_attr_max_state);
874 if (result)
875 goto unregister;
876
877 result = device_create_file(&cdev->device, &dev_attr_cur_state);
878 if (result)
879 goto unregister;
880
881 mutex_lock(&thermal_list_lock);
882 list_add(&cdev->node, &thermal_cdev_list);
883 list_for_each_entry(pos, &thermal_tz_list, node) {
884 if (!pos->ops->bind)
885 continue;
886 result = pos->ops->bind(pos, cdev);
887 if (result)
888 break;
889
890 }
891 mutex_unlock(&thermal_list_lock);
892
893 if (!result)
894 return cdev;
895
896 unregister:
897 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
898 device_unregister(&cdev->device);
899 return ERR_PTR(result);
900 }
901
902 EXPORT_SYMBOL(thermal_cooling_device_register);
903
904 /**
905 * thermal_cooling_device_unregister - removes the registered thermal cooling device
906 * @cdev: the thermal cooling device to remove.
907 *
908 * thermal_cooling_device_unregister() must be called when the device is no
909 * longer needed.
910 */
911 void thermal_cooling_device_unregister(struct
912 thermal_cooling_device
913 *cdev)
914 {
915 struct thermal_zone_device *tz;
916 struct thermal_cooling_device *pos = NULL;
917
918 if (!cdev)
919 return;
920
921 mutex_lock(&thermal_list_lock);
922 list_for_each_entry(pos, &thermal_cdev_list, node)
923 if (pos == cdev)
924 break;
925 if (pos != cdev) {
926 /* thermal cooling device not found */
927 mutex_unlock(&thermal_list_lock);
928 return;
929 }
930 list_del(&cdev->node);
931 list_for_each_entry(tz, &thermal_tz_list, node) {
932 if (!tz->ops->unbind)
933 continue;
934 tz->ops->unbind(tz, cdev);
935 }
936 mutex_unlock(&thermal_list_lock);
937 if (cdev->type[0])
938 device_remove_file(&cdev->device, &dev_attr_cdev_type);
939 device_remove_file(&cdev->device, &dev_attr_max_state);
940 device_remove_file(&cdev->device, &dev_attr_cur_state);
941
942 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
943 device_unregister(&cdev->device);
944 return;
945 }
946
947 EXPORT_SYMBOL(thermal_cooling_device_unregister);
948
949 /**
950 * thermal_zone_device_update - force an update of a thermal zone's state
951 * @ttz: the thermal zone to update
952 */
953
954 void thermal_zone_device_update(struct thermal_zone_device *tz)
955 {
956 int count, ret = 0;
957 long temp, trip_temp;
958 enum thermal_trip_type trip_type;
959 struct thermal_cooling_device_instance *instance;
960 struct thermal_cooling_device *cdev;
961
962 mutex_lock(&tz->lock);
963
964 if (tz->ops->get_temp(tz, &temp)) {
965 /* get_temp failed - retry it later */
966 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
967 "%d\n", tz->id);
968 goto leave;
969 }
970
971 for (count = 0; count < tz->trips; count++) {
972 tz->ops->get_trip_type(tz, count, &trip_type);
973 tz->ops->get_trip_temp(tz, count, &trip_temp);
974
975 switch (trip_type) {
976 case THERMAL_TRIP_CRITICAL:
977 if (temp >= trip_temp) {
978 if (tz->ops->notify)
979 ret = tz->ops->notify(tz, count,
980 trip_type);
981 if (!ret) {
982 printk(KERN_EMERG
983 "Critical temperature reached (%ld C), shutting down.\n",
984 temp/1000);
985 orderly_poweroff(true);
986 }
987 }
988 break;
989 case THERMAL_TRIP_HOT:
990 if (temp >= trip_temp)
991 if (tz->ops->notify)
992 tz->ops->notify(tz, count, trip_type);
993 break;
994 case THERMAL_TRIP_ACTIVE:
995 list_for_each_entry(instance, &tz->cooling_devices,
996 node) {
997 if (instance->trip != count)
998 continue;
999
1000 cdev = instance->cdev;
1001
1002 if (temp >= trip_temp)
1003 cdev->ops->set_cur_state(cdev, 1);
1004 else
1005 cdev->ops->set_cur_state(cdev, 0);
1006 }
1007 break;
1008 case THERMAL_TRIP_PASSIVE:
1009 if (temp >= trip_temp || tz->passive)
1010 thermal_zone_device_passive(tz, temp,
1011 trip_temp, count);
1012 break;
1013 }
1014 }
1015
1016 if (tz->forced_passive)
1017 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1018 THERMAL_TRIPS_NONE);
1019
1020 tz->last_temperature = temp;
1021
1022 leave:
1023 if (tz->passive)
1024 thermal_zone_device_set_polling(tz, tz->passive_delay);
1025 else if (tz->polling_delay)
1026 thermal_zone_device_set_polling(tz, tz->polling_delay);
1027 else
1028 thermal_zone_device_set_polling(tz, 0);
1029 mutex_unlock(&tz->lock);
1030 }
1031 EXPORT_SYMBOL(thermal_zone_device_update);
1032
1033 /**
1034 * thermal_zone_device_register - register a new thermal zone device
1035 * @type: the thermal zone device type
1036 * @trips: the number of trip points the thermal zone support
1037 * @devdata: private device data
1038 * @ops: standard thermal zone device callbacks
1039 * @tc1: thermal coefficient 1 for passive calculations
1040 * @tc2: thermal coefficient 2 for passive calculations
1041 * @passive_delay: number of milliseconds to wait between polls when
1042 * performing passive cooling
1043 * @polling_delay: number of milliseconds to wait between polls when checking
1044 * whether trip points have been crossed (0 for interrupt
1045 * driven systems)
1046 *
1047 * thermal_zone_device_unregister() must be called when the device is no
1048 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1049 * section 11.1.5.1 of the ACPI specification 3.0.
1050 */
1051 struct thermal_zone_device *thermal_zone_device_register(char *type,
1052 int trips, void *devdata,
1053 const struct thermal_zone_device_ops *ops,
1054 int tc1, int tc2, int passive_delay, int polling_delay)
1055 {
1056 struct thermal_zone_device *tz;
1057 struct thermal_cooling_device *pos;
1058 enum thermal_trip_type trip_type;
1059 int result;
1060 int count;
1061 int passive = 0;
1062
1063 if (strlen(type) >= THERMAL_NAME_LENGTH)
1064 return ERR_PTR(-EINVAL);
1065
1066 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1067 return ERR_PTR(-EINVAL);
1068
1069 if (!ops || !ops->get_temp)
1070 return ERR_PTR(-EINVAL);
1071
1072 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1073 if (!tz)
1074 return ERR_PTR(-ENOMEM);
1075
1076 INIT_LIST_HEAD(&tz->cooling_devices);
1077 idr_init(&tz->idr);
1078 mutex_init(&tz->lock);
1079 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1080 if (result) {
1081 kfree(tz);
1082 return ERR_PTR(result);
1083 }
1084
1085 strcpy(tz->type, type);
1086 tz->ops = ops;
1087 tz->device.class = &thermal_class;
1088 tz->devdata = devdata;
1089 tz->trips = trips;
1090 tz->tc1 = tc1;
1091 tz->tc2 = tc2;
1092 tz->passive_delay = passive_delay;
1093 tz->polling_delay = polling_delay;
1094
1095 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1096 result = device_register(&tz->device);
1097 if (result) {
1098 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1099 kfree(tz);
1100 return ERR_PTR(result);
1101 }
1102
1103 /* sys I/F */
1104 if (type) {
1105 result = device_create_file(&tz->device, &dev_attr_type);
1106 if (result)
1107 goto unregister;
1108 }
1109
1110 result = device_create_file(&tz->device, &dev_attr_temp);
1111 if (result)
1112 goto unregister;
1113
1114 if (ops->get_mode) {
1115 result = device_create_file(&tz->device, &dev_attr_mode);
1116 if (result)
1117 goto unregister;
1118 }
1119
1120 for (count = 0; count < trips; count++) {
1121 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1122 if (result)
1123 goto unregister;
1124 tz->ops->get_trip_type(tz, count, &trip_type);
1125 if (trip_type == THERMAL_TRIP_PASSIVE)
1126 passive = 1;
1127 }
1128
1129 if (!passive)
1130 result = device_create_file(&tz->device,
1131 &dev_attr_passive);
1132
1133 if (result)
1134 goto unregister;
1135
1136 result = thermal_add_hwmon_sysfs(tz);
1137 if (result)
1138 goto unregister;
1139
1140 mutex_lock(&thermal_list_lock);
1141 list_add_tail(&tz->node, &thermal_tz_list);
1142 if (ops->bind)
1143 list_for_each_entry(pos, &thermal_cdev_list, node) {
1144 result = ops->bind(tz, pos);
1145 if (result)
1146 break;
1147 }
1148 mutex_unlock(&thermal_list_lock);
1149
1150 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1151
1152 thermal_zone_device_update(tz);
1153
1154 if (!result)
1155 return tz;
1156
1157 unregister:
1158 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1159 device_unregister(&tz->device);
1160 return ERR_PTR(result);
1161 }
1162
1163 EXPORT_SYMBOL(thermal_zone_device_register);
1164
1165 /**
1166 * thermal_device_unregister - removes the registered thermal zone device
1167 * @tz: the thermal zone device to remove
1168 */
1169 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1170 {
1171 struct thermal_cooling_device *cdev;
1172 struct thermal_zone_device *pos = NULL;
1173 int count;
1174
1175 if (!tz)
1176 return;
1177
1178 mutex_lock(&thermal_list_lock);
1179 list_for_each_entry(pos, &thermal_tz_list, node)
1180 if (pos == tz)
1181 break;
1182 if (pos != tz) {
1183 /* thermal zone device not found */
1184 mutex_unlock(&thermal_list_lock);
1185 return;
1186 }
1187 list_del(&tz->node);
1188 if (tz->ops->unbind)
1189 list_for_each_entry(cdev, &thermal_cdev_list, node)
1190 tz->ops->unbind(tz, cdev);
1191 mutex_unlock(&thermal_list_lock);
1192
1193 thermal_zone_device_set_polling(tz, 0);
1194
1195 if (tz->type[0])
1196 device_remove_file(&tz->device, &dev_attr_type);
1197 device_remove_file(&tz->device, &dev_attr_temp);
1198 if (tz->ops->get_mode)
1199 device_remove_file(&tz->device, &dev_attr_mode);
1200
1201 for (count = 0; count < tz->trips; count++)
1202 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1203
1204 thermal_remove_hwmon_sysfs(tz);
1205 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1206 idr_destroy(&tz->idr);
1207 mutex_destroy(&tz->lock);
1208 device_unregister(&tz->device);
1209 return;
1210 }
1211
1212 EXPORT_SYMBOL(thermal_zone_device_unregister);
1213
1214 #ifdef CONFIG_NET
1215 static struct genl_family thermal_event_genl_family = {
1216 .id = GENL_ID_GENERATE,
1217 .name = THERMAL_GENL_FAMILY_NAME,
1218 .version = THERMAL_GENL_VERSION,
1219 .maxattr = THERMAL_GENL_ATTR_MAX,
1220 };
1221
1222 static struct genl_multicast_group thermal_event_mcgrp = {
1223 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1224 };
1225
1226 int generate_netlink_event(u32 orig, enum events event)
1227 {
1228 struct sk_buff *skb;
1229 struct nlattr *attr;
1230 struct thermal_genl_event *thermal_event;
1231 void *msg_header;
1232 int size;
1233 int result;
1234
1235 /* allocate memory */
1236 size = nla_total_size(sizeof(struct thermal_genl_event)) + \
1237 nla_total_size(0);
1238
1239 skb = genlmsg_new(size, GFP_ATOMIC);
1240 if (!skb)
1241 return -ENOMEM;
1242
1243 /* add the genetlink message header */
1244 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1245 &thermal_event_genl_family, 0,
1246 THERMAL_GENL_CMD_EVENT);
1247 if (!msg_header) {
1248 nlmsg_free(skb);
1249 return -ENOMEM;
1250 }
1251
1252 /* fill the data */
1253 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
1254 sizeof(struct thermal_genl_event));
1255
1256 if (!attr) {
1257 nlmsg_free(skb);
1258 return -EINVAL;
1259 }
1260
1261 thermal_event = nla_data(attr);
1262 if (!thermal_event) {
1263 nlmsg_free(skb);
1264 return -EINVAL;
1265 }
1266
1267 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1268
1269 thermal_event->orig = orig;
1270 thermal_event->event = event;
1271
1272 /* send multicast genetlink message */
1273 result = genlmsg_end(skb, msg_header);
1274 if (result < 0) {
1275 nlmsg_free(skb);
1276 return result;
1277 }
1278
1279 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1280 if (result)
1281 printk(KERN_INFO "failed to send netlink event:%d", result);
1282
1283 return result;
1284 }
1285 EXPORT_SYMBOL(generate_netlink_event);
1286
1287 static int genetlink_init(void)
1288 {
1289 int result;
1290
1291 result = genl_register_family(&thermal_event_genl_family);
1292 if (result)
1293 return result;
1294
1295 result = genl_register_mc_group(&thermal_event_genl_family,
1296 &thermal_event_mcgrp);
1297 if (result)
1298 genl_unregister_family(&thermal_event_genl_family);
1299 return result;
1300 }
1301
1302 static void genetlink_exit(void)
1303 {
1304 genl_unregister_family(&thermal_event_genl_family);
1305 }
1306 #else /* !CONFIG_NET */
1307 static inline int genetlink_init(void) { return 0; }
1308 static inline void genetlink_exit(void) {}
1309 #endif /* !CONFIG_NET */
1310
1311 static int __init thermal_init(void)
1312 {
1313 int result = 0;
1314
1315 result = class_register(&thermal_class);
1316 if (result) {
1317 idr_destroy(&thermal_tz_idr);
1318 idr_destroy(&thermal_cdev_idr);
1319 mutex_destroy(&thermal_idr_lock);
1320 mutex_destroy(&thermal_list_lock);
1321 }
1322 result = genetlink_init();
1323 return result;
1324 }
1325
1326 static void __exit thermal_exit(void)
1327 {
1328 class_unregister(&thermal_class);
1329 idr_destroy(&thermal_tz_idr);
1330 idr_destroy(&thermal_cdev_idr);
1331 mutex_destroy(&thermal_idr_lock);
1332 mutex_destroy(&thermal_list_lock);
1333 genetlink_exit();
1334 }
1335
1336 fs_initcall(thermal_init);
1337 module_exit(thermal_exit);
Linux with added FPC-III support