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ACPI: update thermal for bus_id removal
[linux-2.6-block.git] / drivers / thermal / thermal_sys.c
CommitLineData
203d3d4a
ZR		 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/kdev_t.h>
30#include <linux/idr.h>
31#include <linux/thermal.h>
32#include <linux/spinlock.h>
b1569e99 33#include <linux/reboot.h>
203d3d4a 34
63c4ec90 35MODULE_AUTHOR("Zhang Rui");
203d3d4a
ZR		 36MODULE_DESCRIPTION("Generic thermal management sysfs support");
37MODULE_LICENSE("GPL");
38
39#define PREFIX "Thermal: "
40
41struct thermal_cooling_device_instance {
42 int id;
43 char name[THERMAL_NAME_LENGTH];
44 struct thermal_zone_device *tz;
45 struct thermal_cooling_device *cdev;
46 int trip;
47 char attr_name[THERMAL_NAME_LENGTH];
48 struct device_attribute attr;
49 struct list_head node;
50};
51
52static DEFINE_IDR(thermal_tz_idr);
53static DEFINE_IDR(thermal_cdev_idr);
54static DEFINE_MUTEX(thermal_idr_lock);
55
56static LIST_HEAD(thermal_tz_list);
57static LIST_HEAD(thermal_cdev_list);
58static DEFINE_MUTEX(thermal_list_lock);
59
60static int get_idr(struct idr *idr, struct mutex *lock, int *id)
61{
62 int err;
63
64 again:
65 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
66 return -ENOMEM;
67
68 if (lock)
69 mutex_lock(lock);
70 err = idr_get_new(idr, NULL, id);
71 if (lock)
72 mutex_unlock(lock);
73 if (unlikely(err == -EAGAIN))
74 goto again;
75 else if (unlikely(err))
76 return err;
77
78 *id = *id & MAX_ID_MASK;
79 return 0;
80}
81
82static void release_idr(struct idr *idr, struct mutex *lock, int id)
83{
84 if (lock)
85 mutex_lock(lock);
86 idr_remove(idr, id);
87 if (lock)
88 mutex_unlock(lock);
89}
90
91/* sys I/F for thermal zone */
92
93#define to_thermal_zone(_dev) \
94 container_of(_dev, struct thermal_zone_device, device)
95
96static ssize_t
97type_show(struct device *dev, struct device_attribute *attr, char *buf)
98{
99 struct thermal_zone_device *tz = to_thermal_zone(dev);
100
101 return sprintf(buf, "%s\n", tz->type);
102}
103
104static ssize_t
105temp_show(struct device *dev, struct device_attribute *attr, char *buf)
106{
107 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 108 long temperature;
109 int ret;
203d3d4a
ZR		 110
111 if (!tz->ops->get_temp)
112 return -EPERM;
113
6503e5df
MG		 114 ret = tz->ops->get_temp(tz, &temperature);
115
116 if (ret)
117 return ret;
118
119 return sprintf(buf, "%ld\n", temperature);
203d3d4a
ZR		 120}
121
122static ssize_t
123mode_show(struct device *dev, struct device_attribute *attr, char *buf)
124{
125 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 126 enum thermal_device_mode mode;
127 int result;
203d3d4a
ZR		 128
129 if (!tz->ops->get_mode)
130 return -EPERM;
131
6503e5df
MG		 132 result = tz->ops->get_mode(tz, &mode);
133 if (result)
134 return result;
135
136 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
137 : "disabled");
203d3d4a
ZR		 138}
139
140static ssize_t
141mode_store(struct device *dev, struct device_attribute *attr,
142 const char *buf, size_t count)
143{
144 struct thermal_zone_device *tz = to_thermal_zone(dev);
145 int result;
146
147 if (!tz->ops->set_mode)
148 return -EPERM;
149
6503e5df
MG		 150 if (!strncmp(buf, "enabled", sizeof("enabled")))
151 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
152 else if (!strncmp(buf, "disabled", sizeof("disabled")))
153 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
154 else
155 result = -EINVAL;
156
203d3d4a
ZR		 157 if (result)
158 return result;
159
160 return count;
161}
162
163static ssize_t
164trip_point_type_show(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 168 enum thermal_trip_type type;
169 int trip, result;
203d3d4a
ZR		 170
171 if (!tz->ops->get_trip_type)
172 return -EPERM;
173
174 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
175 return -EINVAL;
176
6503e5df
MG		 177 result = tz->ops->get_trip_type(tz, trip, &type);
178 if (result)
179 return result;
180
181 switch (type) {
182 case THERMAL_TRIP_CRITICAL:
183 return sprintf(buf, "critical");
184 case THERMAL_TRIP_HOT:
185 return sprintf(buf, "hot");
186 case THERMAL_TRIP_PASSIVE:
187 return sprintf(buf, "passive");
188 case THERMAL_TRIP_ACTIVE:
189 return sprintf(buf, "active");
190 default:
191 return sprintf(buf, "unknown");
192 }
203d3d4a
ZR		 193}
194
195static ssize_t
196trip_point_temp_show(struct device *dev, struct device_attribute *attr,
197 char *buf)
198{
199 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 200 int trip, ret;
201 long temperature;
203d3d4a
ZR		 202
203 if (!tz->ops->get_trip_temp)
204 return -EPERM;
205
206 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
207 return -EINVAL;
208
6503e5df
MG		 209 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
210
211 if (ret)
212 return ret;
213
214 return sprintf(buf, "%ld\n", temperature);
203d3d4a
ZR		 215}
216
217static DEVICE_ATTR(type, 0444, type_show, NULL);
218static DEVICE_ATTR(temp, 0444, temp_show, NULL);
219static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
220
221static struct device_attribute trip_point_attrs[] = {
222 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
223 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
224 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
225 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
226 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
227 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
228 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
229 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
230 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
231 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
232 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
233 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
234 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
235 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
236 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
237 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
238 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
239 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
240 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
241 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
5f1a3f2a
KH		 242 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
243 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
244 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
245 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
203d3d4a
ZR		 246};
247
248#define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
249do { \
250 result = device_create_file(_dev, \
251 &trip_point_attrs[_index * 2]); \
252 if (result) \
253 break; \
254 result = device_create_file(_dev, \
255 &trip_point_attrs[_index * 2 + 1]); \
256} while (0)
257
258#define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
259do { \
260 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
261 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
262} while (0)
263
264/* sys I/F for cooling device */
265#define to_cooling_device(_dev) \
266 container_of(_dev, struct thermal_cooling_device, device)
267
268static ssize_t
269thermal_cooling_device_type_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
271{
272 struct thermal_cooling_device *cdev = to_cooling_device(dev);
273
274 return sprintf(buf, "%s\n", cdev->type);
275}
276
277static ssize_t
278thermal_cooling_device_max_state_show(struct device *dev,
279 struct device_attribute *attr, char *buf)
280{
281 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df
MG		 282 unsigned long state;
283 int ret;
203d3d4a 284
6503e5df
MG		 285 ret = cdev->ops->get_max_state(cdev, &state);
286 if (ret)
287 return ret;
288 return sprintf(buf, "%ld\n", state);
203d3d4a
ZR		 289}
290
291static ssize_t
292thermal_cooling_device_cur_state_show(struct device *dev,
293 struct device_attribute *attr, char *buf)
294{
295 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df
MG		 296 unsigned long state;
297 int ret;
203d3d4a 298
6503e5df
MG		 299 ret = cdev->ops->get_cur_state(cdev, &state);
300 if (ret)
301 return ret;
302 return sprintf(buf, "%ld\n", state);
203d3d4a
ZR		 303}
304
305static ssize_t
306thermal_cooling_device_cur_state_store(struct device *dev,
307 struct device_attribute *attr,
308 const char *buf, size_t count)
309{
310 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df 311 unsigned long state;
203d3d4a
ZR		 312 int result;
313
6503e5df 314 if (!sscanf(buf, "%ld\n", &state))
203d3d4a
ZR		 315 return -EINVAL;
316
317 if (state < 0)
318 return -EINVAL;
319
320 result = cdev->ops->set_cur_state(cdev, state);
321 if (result)
322 return result;
323 return count;
324}
325
326static struct device_attribute dev_attr_cdev_type =
543a9561 327__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
203d3d4a
ZR		 328static DEVICE_ATTR(max_state, 0444,
329 thermal_cooling_device_max_state_show, NULL);
330static DEVICE_ATTR(cur_state, 0644,
331 thermal_cooling_device_cur_state_show,
332 thermal_cooling_device_cur_state_store);
333
334static ssize_t
335thermal_cooling_device_trip_point_show(struct device *dev,
543a9561 336 struct device_attribute *attr, char *buf)
203d3d4a
ZR		 337{
338 struct thermal_cooling_device_instance *instance;
339
340 instance =
341 container_of(attr, struct thermal_cooling_device_instance, attr);
342
343 if (instance->trip == THERMAL_TRIPS_NONE)
344 return sprintf(buf, "-1\n");
345 else
346 return sprintf(buf, "%d\n", instance->trip);
347}
348
349/* Device management */
350
16d75239
RH		 351#if defined(CONFIG_THERMAL_HWMON)
352
e68b16ab
ZR		 353/* hwmon sys I/F */
354#include <linux/hwmon.h>
355static LIST_HEAD(thermal_hwmon_list);
356
357static ssize_t
358name_show(struct device *dev, struct device_attribute *attr, char *buf)
359{
360 struct thermal_hwmon_device *hwmon = dev->driver_data;
361 return sprintf(buf, "%s\n", hwmon->type);
362}
363static DEVICE_ATTR(name, 0444, name_show, NULL);
364
365static ssize_t
366temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
367{
6503e5df
MG		 368 long temperature;
369 int ret;
e68b16ab
ZR		 370 struct thermal_hwmon_attr *hwmon_attr
371 = container_of(attr, struct thermal_hwmon_attr, attr);
372 struct thermal_zone_device *tz
373 = container_of(hwmon_attr, struct thermal_zone_device,
374 temp_input);
375
6503e5df
MG		 376 ret = tz->ops->get_temp(tz, &temperature);
377
378 if (ret)
379 return ret;
380
381 return sprintf(buf, "%ld\n", temperature);
e68b16ab
ZR		 382}
383
384static ssize_t
385temp_crit_show(struct device *dev, struct device_attribute *attr,
386 char *buf)
387{
388 struct thermal_hwmon_attr *hwmon_attr
389 = container_of(attr, struct thermal_hwmon_attr, attr);
390 struct thermal_zone_device *tz
391 = container_of(hwmon_attr, struct thermal_zone_device,
392 temp_crit);
6503e5df
MG		 393 long temperature;
394 int ret;
395
396 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
397 if (ret)
398 return ret;
e68b16ab 399
6503e5df 400 return sprintf(buf, "%ld\n", temperature);
e68b16ab
ZR		 401}
402
403
404static int
405thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
406{
407 struct thermal_hwmon_device *hwmon;
408 int new_hwmon_device = 1;
409 int result;
410
411 mutex_lock(&thermal_list_lock);
412 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
413 if (!strcmp(hwmon->type, tz->type)) {
414 new_hwmon_device = 0;
415 mutex_unlock(&thermal_list_lock);
416 goto register_sys_interface;
417 }
418 mutex_unlock(&thermal_list_lock);
419
420 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
421 if (!hwmon)
422 return -ENOMEM;
423
424 INIT_LIST_HEAD(&hwmon->tz_list);
425 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
426 hwmon->device = hwmon_device_register(NULL);
427 if (IS_ERR(hwmon->device)) {
428 result = PTR_ERR(hwmon->device);
429 goto free_mem;
430 }
431 hwmon->device->driver_data = hwmon;
432 result = device_create_file(hwmon->device, &dev_attr_name);
433 if (result)
434 goto unregister_hwmon_device;
435
436 register_sys_interface:
437 tz->hwmon = hwmon;
438 hwmon->count++;
439
440 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
441 "temp%d_input", hwmon->count);
442 tz->temp_input.attr.attr.name = tz->temp_input.name;
443 tz->temp_input.attr.attr.mode = 0444;
444 tz->temp_input.attr.show = temp_input_show;
445 result = device_create_file(hwmon->device, &tz->temp_input.attr);
446 if (result)
447 goto unregister_hwmon_device;
448
449 if (tz->ops->get_crit_temp) {
450 unsigned long temperature;
451 if (!tz->ops->get_crit_temp(tz, &temperature)) {
452 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
453 "temp%d_crit", hwmon->count);
454 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
455 tz->temp_crit.attr.attr.mode = 0444;
456 tz->temp_crit.attr.show = temp_crit_show;
457 result = device_create_file(hwmon->device,
458 &tz->temp_crit.attr);
459 if (result)
460 goto unregister_hwmon_device;
461 }
462 }
463
464 mutex_lock(&thermal_list_lock);
465 if (new_hwmon_device)
466 list_add_tail(&hwmon->node, &thermal_hwmon_list);
467 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
468 mutex_unlock(&thermal_list_lock);
469
470 return 0;
471
472 unregister_hwmon_device:
473 device_remove_file(hwmon->device, &tz->temp_crit.attr);
474 device_remove_file(hwmon->device, &tz->temp_input.attr);
475 if (new_hwmon_device) {
476 device_remove_file(hwmon->device, &dev_attr_name);
477 hwmon_device_unregister(hwmon->device);
478 }
479 free_mem:
480 if (new_hwmon_device)
481 kfree(hwmon);
482
483 return result;
484}
485
486static void
487thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
488{
489 struct thermal_hwmon_device *hwmon = tz->hwmon;
490
491 tz->hwmon = NULL;
492 device_remove_file(hwmon->device, &tz->temp_input.attr);
493 device_remove_file(hwmon->device, &tz->temp_crit.attr);
494
495 mutex_lock(&thermal_list_lock);
496 list_del(&tz->hwmon_node);
497 if (!list_empty(&hwmon->tz_list)) {
498 mutex_unlock(&thermal_list_lock);
499 return;
500 }
501 list_del(&hwmon->node);
502 mutex_unlock(&thermal_list_lock);
503
504 device_remove_file(hwmon->device, &dev_attr_name);
505 hwmon_device_unregister(hwmon->device);
506 kfree(hwmon);
507}
508#else
509static int
510thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
511{
512 return 0;
513}
514
515static void
516thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
517{
518}
519#endif
520
b1569e99
MG		 521static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
522 int delay)
523{
524 cancel_delayed_work(&(tz->poll_queue));
525
526 if (!delay)
527 return;
528
529 if (delay > 1000)
530 schedule_delayed_work(&(tz->poll_queue),
531 round_jiffies(msecs_to_jiffies(delay)));
532 else
533 schedule_delayed_work(&(tz->poll_queue),
534 msecs_to_jiffies(delay));
535}
536
537static void thermal_zone_device_passive(struct thermal_zone_device *tz,
538 int temp, int trip_temp, int trip)
539{
540 int trend = 0;
541 struct thermal_cooling_device_instance *instance;
542 struct thermal_cooling_device *cdev;
543 long state, max_state;
544
545 /*
546 * Above Trip?
547 * -----------
548 * Calculate the thermal trend (using the passive cooling equation)
549 * and modify the performance limit for all passive cooling devices
550 * accordingly. Note that we assume symmetry.
551 */
552 if (temp >= trip_temp) {
553 tz->passive = true;
554
555 trend = (tz->tc1 * (temp - tz->last_temperature)) +
556 (tz->tc2 * (temp - trip_temp));
557
558 /* Heating up? */
559 if (trend > 0) {
560 list_for_each_entry(instance, &tz->cooling_devices,
561 node) {
562 if (instance->trip != trip)
563 continue;
564 cdev = instance->cdev;
565 cdev->ops->get_cur_state(cdev, &state);
566 cdev->ops->get_max_state(cdev, &max_state);
567 if (state++ < max_state)
568 cdev->ops->set_cur_state(cdev, state);
569 }
570 } else if (trend < 0) { /* Cooling off? */
571 list_for_each_entry(instance, &tz->cooling_devices,
572 node) {
573 if (instance->trip != trip)
574 continue;
575 cdev = instance->cdev;
576 cdev->ops->get_cur_state(cdev, &state);
577 cdev->ops->get_max_state(cdev, &max_state);
578 if (state > 0)
579 cdev->ops->set_cur_state(cdev, --state);
580 }
581 }
582 return;
583 }
584
585 /*
586 * Below Trip?
587 * -----------
588 * Implement passive cooling hysteresis to slowly increase performance
589 * and avoid thrashing around the passive trip point. Note that we
590 * assume symmetry.
591 */
592 list_for_each_entry(instance, &tz->cooling_devices, node) {
593 if (instance->trip != trip)
594 continue;
595 cdev = instance->cdev;
596 cdev->ops->get_cur_state(cdev, &state);
597 cdev->ops->get_max_state(cdev, &max_state);
598 if (state > 0)
599 cdev->ops->set_cur_state(cdev, --state);
600 if (state == 0)
601 tz->passive = false;
602 }
603}
604
605static void thermal_zone_device_check(struct work_struct *work)
606{
607 struct thermal_zone_device *tz = container_of(work, struct
608 thermal_zone_device,
609 poll_queue.work);
610 thermal_zone_device_update(tz);
611}
e68b16ab 612
203d3d4a
ZR		 613/**
614 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
203d3d4a
ZR		 615 * @tz: thermal zone device
616 * @trip: indicates which trip point the cooling devices is
617 * associated with in this thermal zone.
618 * @cdev: thermal cooling device
543a9561
LB		 619 *
620 * This function is usually called in the thermal zone device .bind callback.
203d3d4a
ZR		 621 */
622int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
623 int trip,
624 struct thermal_cooling_device *cdev)
625{
626 struct thermal_cooling_device_instance *dev;
627 struct thermal_cooling_device_instance *pos;
c7516709
TS		 628 struct thermal_zone_device *pos1;
629 struct thermal_cooling_device *pos2;
203d3d4a
ZR		 630 int result;
631
543a9561 632 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
203d3d4a
ZR		 633 return -EINVAL;
634
c7516709
TS		 635 list_for_each_entry(pos1, &thermal_tz_list, node) {
636 if (pos1 == tz)
637 break;
638 }
639 list_for_each_entry(pos2, &thermal_cdev_list, node) {
640 if (pos2 == cdev)
641 break;
642 }
643
644 if (tz != pos1 || cdev != pos2)
203d3d4a
ZR		 645 return -EINVAL;
646
647 dev =
648 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
649 if (!dev)
650 return -ENOMEM;
651 dev->tz = tz;
652 dev->cdev = cdev;
653 dev->trip = trip;
654 result = get_idr(&tz->idr, &tz->lock, &dev->id);
655 if (result)
656 goto free_mem;
657
658 sprintf(dev->name, "cdev%d", dev->id);
659 result =
660 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
661 if (result)
662 goto release_idr;
663
664 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
665 dev->attr.attr.name = dev->attr_name;
666 dev->attr.attr.mode = 0444;
667 dev->attr.show = thermal_cooling_device_trip_point_show;
668 result = device_create_file(&tz->device, &dev->attr);
669 if (result)
670 goto remove_symbol_link;
671
672 mutex_lock(&tz->lock);
673 list_for_each_entry(pos, &tz->cooling_devices, node)
674 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
675 result = -EEXIST;
676 break;
677 }
678 if (!result)
679 list_add_tail(&dev->node, &tz->cooling_devices);
680 mutex_unlock(&tz->lock);
681
682 if (!result)
683 return 0;
684
685 device_remove_file(&tz->device, &dev->attr);
686 remove_symbol_link:
687 sysfs_remove_link(&tz->device.kobj, dev->name);
688 release_idr:
689 release_idr(&tz->idr, &tz->lock, dev->id);
690 free_mem:
691 kfree(dev);
692 return result;
693}
543a9561 694
203d3d4a
ZR		 695EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
696
697/**
698 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
203d3d4a
ZR		 699 * @tz: thermal zone device
700 * @trip: indicates which trip point the cooling devices is
701 * associated with in this thermal zone.
702 * @cdev: thermal cooling device
543a9561
LB		 703 *
704 * This function is usually called in the thermal zone device .unbind callback.
203d3d4a
ZR		 705 */
706int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
707 int trip,
708 struct thermal_cooling_device *cdev)
709{
710 struct thermal_cooling_device_instance *pos, *next;
711
712 mutex_lock(&tz->lock);
713 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
543a9561 714 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
203d3d4a
ZR		 715 list_del(&pos->node);
716 mutex_unlock(&tz->lock);
717 goto unbind;
718 }
719 }
720 mutex_unlock(&tz->lock);
721
722 return -ENODEV;
723
724 unbind:
725 device_remove_file(&tz->device, &pos->attr);
726 sysfs_remove_link(&tz->device.kobj, pos->name);
727 release_idr(&tz->idr, &tz->lock, pos->id);
728 kfree(pos);
729 return 0;
730}
543a9561 731
203d3d4a
ZR		 732EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
733
734static void thermal_release(struct device *dev)
735{
736 struct thermal_zone_device *tz;
737 struct thermal_cooling_device *cdev;
738
354655ea 739 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
203d3d4a
ZR		 740 tz = to_thermal_zone(dev);
741 kfree(tz);
742 } else {
743 cdev = to_cooling_device(dev);
744 kfree(cdev);
745 }
746}
747
748static struct class thermal_class = {
749 .name = "thermal",
750 .dev_release = thermal_release,
751};
752
753/**
754 * thermal_cooling_device_register - register a new thermal cooling device
755 * @type: the thermal cooling device type.
756 * @devdata: device private data.
757 * @ops: standard thermal cooling devices callbacks.
758 */
759struct thermal_cooling_device *thermal_cooling_device_register(char *type,
543a9561
LB		 760 void *devdata,
761 struct
762 thermal_cooling_device_ops
763 *ops)
203d3d4a
ZR		 764{
765 struct thermal_cooling_device *cdev;
766 struct thermal_zone_device *pos;
767 int result;
768
769 if (strlen(type) >= THERMAL_NAME_LENGTH)
3e6fda5c 770 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 771
772 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
543a9561 773 !ops->set_cur_state)
3e6fda5c 774 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 775
776 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
777 if (!cdev)
3e6fda5c 778 return ERR_PTR(-ENOMEM);
203d3d4a
ZR		 779
780 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
781 if (result) {
782 kfree(cdev);
3e6fda5c 783 return ERR_PTR(result);
203d3d4a
ZR		 784 }
785
786 strcpy(cdev->type, type);
787 cdev->ops = ops;
788 cdev->device.class = &thermal_class;
789 cdev->devdata = devdata;
354655ea 790 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
203d3d4a
ZR		 791 result = device_register(&cdev->device);
792 if (result) {
793 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
794 kfree(cdev);
3e6fda5c 795 return ERR_PTR(result);
203d3d4a
ZR		 796 }
797
798 /* sys I/F */
799 if (type) {
543a9561 800 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
203d3d4a
ZR		 801 if (result)
802 goto unregister;
803 }
804
805 result = device_create_file(&cdev->device, &dev_attr_max_state);
806 if (result)
807 goto unregister;
808
809 result = device_create_file(&cdev->device, &dev_attr_cur_state);
810 if (result)
811 goto unregister;
812
813 mutex_lock(&thermal_list_lock);
814 list_add(&cdev->node, &thermal_cdev_list);
815 list_for_each_entry(pos, &thermal_tz_list, node) {
816 if (!pos->ops->bind)
817 continue;
818 result = pos->ops->bind(pos, cdev);
819 if (result)
820 break;
821
822 }
823 mutex_unlock(&thermal_list_lock);
824
825 if (!result)
826 return cdev;
827
828 unregister:
829 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
830 device_unregister(&cdev->device);
3e6fda5c 831 return ERR_PTR(result);
203d3d4a 832}
543a9561 833
203d3d4a
ZR		 834EXPORT_SYMBOL(thermal_cooling_device_register);
835
836/**
837 * thermal_cooling_device_unregister - removes the registered thermal cooling device
203d3d4a
ZR		 838 * @cdev: the thermal cooling device to remove.
839 *
840 * thermal_cooling_device_unregister() must be called when the device is no
841 * longer needed.
842 */
843void thermal_cooling_device_unregister(struct
844 thermal_cooling_device
845 *cdev)
846{
847 struct thermal_zone_device *tz;
848 struct thermal_cooling_device *pos = NULL;
849
850 if (!cdev)
851 return;
852
853 mutex_lock(&thermal_list_lock);
854 list_for_each_entry(pos, &thermal_cdev_list, node)
855 if (pos == cdev)
856 break;
857 if (pos != cdev) {
858 /* thermal cooling device not found */
859 mutex_unlock(&thermal_list_lock);
860 return;
861 }
862 list_del(&cdev->node);
863 list_for_each_entry(tz, &thermal_tz_list, node) {
864 if (!tz->ops->unbind)
865 continue;
866 tz->ops->unbind(tz, cdev);
867 }
868 mutex_unlock(&thermal_list_lock);
869 if (cdev->type[0])
543a9561 870 device_remove_file(&cdev->device, &dev_attr_cdev_type);
203d3d4a
ZR		 871 device_remove_file(&cdev->device, &dev_attr_max_state);
872 device_remove_file(&cdev->device, &dev_attr_cur_state);
873
874 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
875 device_unregister(&cdev->device);
876 return;
877}
543a9561 878
203d3d4a
ZR		 879EXPORT_SYMBOL(thermal_cooling_device_unregister);
880
b1569e99
MG		 881/**
882 * thermal_zone_device_update - force an update of a thermal zone's state
883 * @ttz: the thermal zone to update
884 */
885
886void thermal_zone_device_update(struct thermal_zone_device *tz)
887{
888 int count, ret = 0;
889 long temp, trip_temp;
890 enum thermal_trip_type trip_type;
891 struct thermal_cooling_device_instance *instance;
892 struct thermal_cooling_device *cdev;
893
894 mutex_lock(&tz->lock);
895
896 tz->ops->get_temp(tz, &temp);
897
898 for (count = 0; count < tz->trips; count++) {
899 tz->ops->get_trip_type(tz, count, &trip_type);
900 tz->ops->get_trip_temp(tz, count, &trip_temp);
901
902 switch (trip_type) {
903 case THERMAL_TRIP_CRITICAL:
904 if (temp > trip_temp) {
905 if (tz->ops->notify)
906 ret = tz->ops->notify(tz, count,
907 trip_type);
908 if (!ret) {
909 printk(KERN_EMERG
910 "Critical temperature reached (%ld C), shutting down.\n",
911 temp/1000);
912 orderly_poweroff(true);
913 }
914 }
915 break;
916 case THERMAL_TRIP_HOT:
917 if (temp > trip_temp)
918 if (tz->ops->notify)
919 tz->ops->notify(tz, count, trip_type);
920 break;
921 case THERMAL_TRIP_ACTIVE:
922 list_for_each_entry(instance, &tz->cooling_devices,
923 node) {
924 if (instance->trip != count)
925 continue;
926
927 cdev = instance->cdev;
928
929 if (temp > trip_temp)
930 cdev->ops->set_cur_state(cdev, 1);
931 else
932 cdev->ops->set_cur_state(cdev, 0);
933 }
934 break;
935 case THERMAL_TRIP_PASSIVE:
936 if (temp > trip_temp || tz->passive)
937 thermal_zone_device_passive(tz, temp,
938 trip_temp, count);
939 break;
940 }
941 }
942 tz->last_temperature = temp;
943 if (tz->passive)
944 thermal_zone_device_set_polling(tz, tz->passive_delay);
945 else if (tz->polling_delay)
946 thermal_zone_device_set_polling(tz, tz->polling_delay);
947 mutex_unlock(&tz->lock);
948}
949EXPORT_SYMBOL(thermal_zone_device_update);
950
203d3d4a
ZR		 951/**
952 * thermal_zone_device_register - register a new thermal zone device
953 * @type: the thermal zone device type
954 * @trips: the number of trip points the thermal zone support
955 * @devdata: private device data
956 * @ops: standard thermal zone device callbacks
b1569e99
MG		 957 * @tc1: thermal coefficient 1 for passive calculations
958 * @tc2: thermal coefficient 2 for passive calculations
959 * @passive_delay: number of milliseconds to wait between polls when
960 * performing passive cooling
961 * @polling_delay: number of milliseconds to wait between polls when checking
962 * whether trip points have been crossed (0 for interrupt
963 * driven systems)
203d3d4a
ZR		 964 *
965 * thermal_zone_device_unregister() must be called when the device is no
b1569e99
MG		 966 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
967 * section 11.1.5.1 of the ACPI specification 3.0.
203d3d4a
ZR		 968 */
969struct thermal_zone_device *thermal_zone_device_register(char *type,
543a9561
LB		 970 int trips,
971 void *devdata, struct
972 thermal_zone_device_ops
b1569e99
MG		 973 *ops, int tc1, int
974 tc2,
975 int passive_delay,
976 int polling_delay)
203d3d4a
ZR		 977{
978 struct thermal_zone_device *tz;
979 struct thermal_cooling_device *pos;
980 int result;
981 int count;
982
983 if (strlen(type) >= THERMAL_NAME_LENGTH)
3e6fda5c 984 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 985
986 if (trips > THERMAL_MAX_TRIPS || trips < 0)
3e6fda5c 987 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 988
989 if (!ops || !ops->get_temp)
3e6fda5c 990 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 991
992 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
993 if (!tz)
3e6fda5c 994 return ERR_PTR(-ENOMEM);
203d3d4a
ZR		 995
996 INIT_LIST_HEAD(&tz->cooling_devices);
997 idr_init(&tz->idr);
998 mutex_init(&tz->lock);
999 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1000 if (result) {
1001 kfree(tz);
3e6fda5c 1002 return ERR_PTR(result);
203d3d4a
ZR		 1003 }
1004
1005 strcpy(tz->type, type);
1006 tz->ops = ops;
1007 tz->device.class = &thermal_class;
1008 tz->devdata = devdata;
1009 tz->trips = trips;
b1569e99
MG		 1010 tz->tc1 = tc1;
1011 tz->tc2 = tc2;
1012 tz->passive_delay = passive_delay;
1013 tz->polling_delay = polling_delay;
1014
354655ea 1015 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
203d3d4a
ZR		 1016 result = device_register(&tz->device);
1017 if (result) {
1018 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1019 kfree(tz);
3e6fda5c 1020 return ERR_PTR(result);
203d3d4a
ZR		 1021 }
1022
1023 /* sys I/F */
1024 if (type) {
1025 result = device_create_file(&tz->device, &dev_attr_type);
1026 if (result)
1027 goto unregister;
1028 }
1029
1030 result = device_create_file(&tz->device, &dev_attr_temp);
1031 if (result)
1032 goto unregister;
1033
1034 if (ops->get_mode) {
1035 result = device_create_file(&tz->device, &dev_attr_mode);
1036 if (result)
1037 goto unregister;
1038 }
1039
1040 for (count = 0; count < trips; count++) {
1041 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1042 if (result)
1043 goto unregister;
1044 }
1045
e68b16ab
ZR		 1046 result = thermal_add_hwmon_sysfs(tz);
1047 if (result)
1048 goto unregister;
1049
203d3d4a
ZR		 1050 mutex_lock(&thermal_list_lock);
1051 list_add_tail(&tz->node, &thermal_tz_list);
1052 if (ops->bind)
1053 list_for_each_entry(pos, &thermal_cdev_list, node) {
543a9561
LB		 1054 result = ops->bind(tz, pos);
1055 if (result)
1056 break;
203d3d4a
ZR		 1057 }
1058 mutex_unlock(&thermal_list_lock);
1059
b1569e99
MG		 1060 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1061
1062 thermal_zone_device_update(tz);
1063
203d3d4a
ZR		 1064 if (!result)
1065 return tz;
1066
1067 unregister:
1068 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1069 device_unregister(&tz->device);
3e6fda5c 1070 return ERR_PTR(result);
203d3d4a 1071}
543a9561 1072
203d3d4a
ZR		 1073EXPORT_SYMBOL(thermal_zone_device_register);
1074
1075/**
1076 * thermal_device_unregister - removes the registered thermal zone device
203d3d4a
ZR		 1077 * @tz: the thermal zone device to remove
1078 */
1079void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1080{
1081 struct thermal_cooling_device *cdev;
1082 struct thermal_zone_device *pos = NULL;
1083 int count;
1084
1085 if (!tz)
1086 return;
1087
1088 mutex_lock(&thermal_list_lock);
1089 list_for_each_entry(pos, &thermal_tz_list, node)
1090 if (pos == tz)
1091 break;
1092 if (pos != tz) {
1093 /* thermal zone device not found */
1094 mutex_unlock(&thermal_list_lock);
1095 return;
1096 }
1097 list_del(&tz->node);
1098 if (tz->ops->unbind)
1099 list_for_each_entry(cdev, &thermal_cdev_list, node)
1100 tz->ops->unbind(tz, cdev);
1101 mutex_unlock(&thermal_list_lock);
1102
b1569e99
MG		 1103 thermal_zone_device_set_polling(tz, 0);
1104
203d3d4a
ZR		 1105 if (tz->type[0])
1106 device_remove_file(&tz->device, &dev_attr_type);
1107 device_remove_file(&tz->device, &dev_attr_temp);
1108 if (tz->ops->get_mode)
1109 device_remove_file(&tz->device, &dev_attr_mode);
1110
1111 for (count = 0; count < tz->trips; count++)
1112 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1113
e68b16ab 1114 thermal_remove_hwmon_sysfs(tz);
203d3d4a
ZR		 1115 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1116 idr_destroy(&tz->idr);
1117 mutex_destroy(&tz->lock);
1118 device_unregister(&tz->device);
1119 return;
1120}
543a9561 1121
203d3d4a
ZR		 1122EXPORT_SYMBOL(thermal_zone_device_unregister);
1123
1124static int __init thermal_init(void)
1125{
1126 int result = 0;
1127
1128 result = class_register(&thermal_class);
1129 if (result) {
1130 idr_destroy(&thermal_tz_idr);
1131 idr_destroy(&thermal_cdev_idr);
1132 mutex_destroy(&thermal_idr_lock);
1133 mutex_destroy(&thermal_list_lock);
1134 }
1135 return result;
1136}
1137
1138static void __exit thermal_exit(void)
1139{
1140 class_unregister(&thermal_class);
1141 idr_destroy(&thermal_tz_idr);
1142 idr_destroy(&thermal_cdev_idr);
1143 mutex_destroy(&thermal_idr_lock);
1144 mutex_destroy(&thermal_list_lock);
1145}
1146
1147subsys_initcall(thermal_init);
1148module_exit(thermal_exit);
Linux 6.x block layer and io_uring tree(s)