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