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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[GitHub/mt8127/android_kernel_alcatel_ttab.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
c5a01dd5
JP		 26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
203d3d4a
ZR		 28#include <linux/module.h>
29#include <linux/device.h>
30#include <linux/err.h>
5a0e3ad6 31#include <linux/slab.h>
203d3d4a
ZR		 32#include <linux/kdev_t.h>
33#include <linux/idr.h>
34#include <linux/thermal.h>
35#include <linux/spinlock.h>
b1569e99 36#include <linux/reboot.h>
4cb18728
D		 37#include <net/netlink.h>
38#include <net/genetlink.h>
203d3d4a 39
63c4ec90 40MODULE_AUTHOR("Zhang Rui");
203d3d4a
ZR		 41MODULE_DESCRIPTION("Generic thermal management sysfs support");
42MODULE_LICENSE("GPL");
43
203d3d4a
ZR		 44struct 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
55static DEFINE_IDR(thermal_tz_idr);
56static DEFINE_IDR(thermal_cdev_idr);
57static DEFINE_MUTEX(thermal_idr_lock);
58
59static LIST_HEAD(thermal_tz_list);
60static LIST_HEAD(thermal_cdev_list);
61static DEFINE_MUTEX(thermal_list_lock);
62
63static int get_idr(struct idr *idr, struct mutex *lock, int *id)
64{
65 int err;
66
caca8b80 67again:
203d3d4a
ZR		 68 if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
69 return -ENOMEM;
70
71 if (lock)
72 mutex_lock(lock);
73 err = idr_get_new(idr, NULL, id);
74 if (lock)
75 mutex_unlock(lock);
76 if (unlikely(err == -EAGAIN))
77 goto again;
78 else if (unlikely(err))
79 return err;
80
81 *id = *id & MAX_ID_MASK;
82 return 0;
83}
84
85static void release_idr(struct idr *idr, struct mutex *lock, int id)
86{
87 if (lock)
88 mutex_lock(lock);
89 idr_remove(idr, id);
90 if (lock)
91 mutex_unlock(lock);
92}
93
94/* sys I/F for thermal zone */
95
96#define to_thermal_zone(_dev) \
97 container_of(_dev, struct thermal_zone_device, device)
98
99static ssize_t
100type_show(struct device *dev, struct device_attribute *attr, char *buf)
101{
102 struct thermal_zone_device *tz = to_thermal_zone(dev);
103
104 return sprintf(buf, "%s\n", tz->type);
105}
106
107static ssize_t
108temp_show(struct device *dev, struct device_attribute *attr, char *buf)
109{
110 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 111 long temperature;
112 int ret;
203d3d4a
ZR		 113
114 if (!tz->ops->get_temp)
115 return -EPERM;
116
6503e5df
MG		 117 ret = tz->ops->get_temp(tz, &temperature);
118
119 if (ret)
120 return ret;
121
122 return sprintf(buf, "%ld\n", temperature);
203d3d4a
ZR		 123}
124
125static ssize_t
126mode_show(struct device *dev, struct device_attribute *attr, char *buf)
127{
128 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 129 enum thermal_device_mode mode;
130 int result;
203d3d4a
ZR		 131
132 if (!tz->ops->get_mode)
133 return -EPERM;
134
6503e5df
MG		 135 result = tz->ops->get_mode(tz, &mode);
136 if (result)
137 return result;
138
139 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
140 : "disabled");
203d3d4a
ZR		 141}
142
143static ssize_t
144mode_store(struct device *dev, struct device_attribute *attr,
145 const char *buf, size_t count)
146{
147 struct thermal_zone_device *tz = to_thermal_zone(dev);
148 int result;
149
150 if (!tz->ops->set_mode)
151 return -EPERM;
152
f1f0e2ac 153 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
6503e5df 154 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
f1f0e2ac 155 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
6503e5df
MG		 156 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
157 else
158 result = -EINVAL;
159
203d3d4a
ZR		 160 if (result)
161 return result;
162
163 return count;
164}
165
166static ssize_t
167trip_point_type_show(struct device *dev, struct device_attribute *attr,
168 char *buf)
169{
170 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 171 enum thermal_trip_type type;
172 int trip, result;
203d3d4a
ZR		 173
174 if (!tz->ops->get_trip_type)
175 return -EPERM;
176
177 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
178 return -EINVAL;
179
6503e5df
MG		 180 result = tz->ops->get_trip_type(tz, trip, &type);
181 if (result)
182 return result;
183
184 switch (type) {
185 case THERMAL_TRIP_CRITICAL:
625120a4 186 return sprintf(buf, "critical\n");
6503e5df 187 case THERMAL_TRIP_HOT:
625120a4 188 return sprintf(buf, "hot\n");
6503e5df 189 case THERMAL_TRIP_PASSIVE:
625120a4 190 return sprintf(buf, "passive\n");
6503e5df 191 case THERMAL_TRIP_ACTIVE:
625120a4 192 return sprintf(buf, "active\n");
6503e5df 193 default:
625120a4 194 return sprintf(buf, "unknown\n");
6503e5df 195 }
203d3d4a
ZR		 196}
197
c56f5c03
D		 198static ssize_t
199trip_point_temp_store(struct device *dev, struct device_attribute *attr,
200 const char *buf, size_t count)
201{
202 struct thermal_zone_device *tz = to_thermal_zone(dev);
203 int trip, ret;
204 unsigned long temperature;
205
206 if (!tz->ops->set_trip_temp)
207 return -EPERM;
208
209 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
210 return -EINVAL;
211
212 if (kstrtoul(buf, 10, &temperature))
213 return -EINVAL;
214
215 ret = tz->ops->set_trip_temp(tz, trip, temperature);
216
217 return ret ? ret : count;
218}
219
203d3d4a
ZR		 220static ssize_t
221trip_point_temp_show(struct device *dev, struct device_attribute *attr,
222 char *buf)
223{
224 struct thermal_zone_device *tz = to_thermal_zone(dev);
6503e5df
MG		 225 int trip, ret;
226 long temperature;
203d3d4a
ZR		 227
228 if (!tz->ops->get_trip_temp)
229 return -EPERM;
230
231 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
232 return -EINVAL;
233
6503e5df
MG		 234 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
235
236 if (ret)
237 return ret;
238
239 return sprintf(buf, "%ld\n", temperature);
203d3d4a
ZR		 240}
241
27365a6c
D		 242static ssize_t
243trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
244 const char *buf, size_t count)
245{
246 struct thermal_zone_device *tz = to_thermal_zone(dev);
247 int trip, ret;
248 unsigned long temperature;
249
250 if (!tz->ops->set_trip_hyst)
251 return -EPERM;
252
253 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
254 return -EINVAL;
255
256 if (kstrtoul(buf, 10, &temperature))
257 return -EINVAL;
258
259 /*
260 * We are not doing any check on the 'temperature' value
261 * here. The driver implementing 'set_trip_hyst' has to
262 * take care of this.
263 */
264 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
265
266 return ret ? ret : count;
267}
268
269static ssize_t
270trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
271 char *buf)
272{
273 struct thermal_zone_device *tz = to_thermal_zone(dev);
274 int trip, ret;
275 unsigned long temperature;
276
277 if (!tz->ops->get_trip_hyst)
278 return -EPERM;
279
280 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
281 return -EINVAL;
282
283 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
284
285 return ret ? ret : sprintf(buf, "%ld\n", temperature);
286}
287
03a971a2
MG		 288static ssize_t
289passive_store(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
291{
292 struct thermal_zone_device *tz = to_thermal_zone(dev);
293 struct thermal_cooling_device *cdev = NULL;
294 int state;
295
296 if (!sscanf(buf, "%d\n", &state))
297 return -EINVAL;
298
3d8e3ad8
FP		 299 /* sanity check: values below 1000 millicelcius don't make sense
300 * and can cause the system to go into a thermal heart attack
301 */
302 if (state && state < 1000)
303 return -EINVAL;
304
03a971a2
MG		 305 if (state && !tz->forced_passive) {
306 mutex_lock(&thermal_list_lock);
307 list_for_each_entry(cdev, &thermal_cdev_list, node) {
308 if (!strncmp("Processor", cdev->type,
309 sizeof("Processor")))
310 thermal_zone_bind_cooling_device(tz,
311 THERMAL_TRIPS_NONE,
312 cdev);
313 }
314 mutex_unlock(&thermal_list_lock);
e4143b03
FP		 315 if (!tz->passive_delay)
316 tz->passive_delay = 1000;
03a971a2
MG		 317 } else if (!state && tz->forced_passive) {
318 mutex_lock(&thermal_list_lock);
319 list_for_each_entry(cdev, &thermal_cdev_list, node) {
320 if (!strncmp("Processor", cdev->type,
321 sizeof("Processor")))
322 thermal_zone_unbind_cooling_device(tz,
323 THERMAL_TRIPS_NONE,
324 cdev);
325 }
326 mutex_unlock(&thermal_list_lock);
e4143b03 327 tz->passive_delay = 0;
03a971a2
MG		 328 }
329
330 tz->tc1 = 1;
331 tz->tc2 = 1;
332
03a971a2
MG		 333 tz->forced_passive = state;
334
335 thermal_zone_device_update(tz);
336
337 return count;
338}
339
340static ssize_t
341passive_show(struct device *dev, struct device_attribute *attr,
342 char *buf)
343{
344 struct thermal_zone_device *tz = to_thermal_zone(dev);
345
346 return sprintf(buf, "%d\n", tz->forced_passive);
347}
348
203d3d4a
ZR		 349static DEVICE_ATTR(type, 0444, type_show, NULL);
350static DEVICE_ATTR(temp, 0444, temp_show, NULL);
351static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
886ee546 352static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
203d3d4a 353
203d3d4a
ZR		 354/* sys I/F for cooling device */
355#define to_cooling_device(_dev) \
356 container_of(_dev, struct thermal_cooling_device, device)
357
358static ssize_t
359thermal_cooling_device_type_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
361{
362 struct thermal_cooling_device *cdev = to_cooling_device(dev);
363
364 return sprintf(buf, "%s\n", cdev->type);
365}
366
367static ssize_t
368thermal_cooling_device_max_state_show(struct device *dev,
369 struct device_attribute *attr, char *buf)
370{
371 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df
MG		 372 unsigned long state;
373 int ret;
203d3d4a 374
6503e5df
MG		 375 ret = cdev->ops->get_max_state(cdev, &state);
376 if (ret)
377 return ret;
378 return sprintf(buf, "%ld\n", state);
203d3d4a
ZR		 379}
380
381static ssize_t
382thermal_cooling_device_cur_state_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
384{
385 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df
MG		 386 unsigned long state;
387 int ret;
203d3d4a 388
6503e5df
MG		 389 ret = cdev->ops->get_cur_state(cdev, &state);
390 if (ret)
391 return ret;
392 return sprintf(buf, "%ld\n", state);
203d3d4a
ZR		 393}
394
395static ssize_t
396thermal_cooling_device_cur_state_store(struct device *dev,
397 struct device_attribute *attr,
398 const char *buf, size_t count)
399{
400 struct thermal_cooling_device *cdev = to_cooling_device(dev);
6503e5df 401 unsigned long state;
203d3d4a
ZR		 402 int result;
403
6503e5df 404 if (!sscanf(buf, "%ld\n", &state))
203d3d4a
ZR		 405 return -EINVAL;
406
edb94918 407 if ((long)state < 0)
203d3d4a
ZR		 408 return -EINVAL;
409
410 result = cdev->ops->set_cur_state(cdev, state);
411 if (result)
412 return result;
413 return count;
414}
415
416static struct device_attribute dev_attr_cdev_type =
543a9561 417__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
203d3d4a
ZR		 418static DEVICE_ATTR(max_state, 0444,
419 thermal_cooling_device_max_state_show, NULL);
420static DEVICE_ATTR(cur_state, 0644,
421 thermal_cooling_device_cur_state_show,
422 thermal_cooling_device_cur_state_store);
423
424static ssize_t
425thermal_cooling_device_trip_point_show(struct device *dev,
543a9561 426 struct device_attribute *attr, char *buf)
203d3d4a
ZR		 427{
428 struct thermal_cooling_device_instance *instance;
429
430 instance =
431 container_of(attr, struct thermal_cooling_device_instance, attr);
432
433 if (instance->trip == THERMAL_TRIPS_NONE)
434 return sprintf(buf, "-1\n");
435 else
436 return sprintf(buf, "%d\n", instance->trip);
437}
438
439/* Device management */
440
16d75239
RH		 441#if defined(CONFIG_THERMAL_HWMON)
442
e68b16ab
ZR		 443/* hwmon sys I/F */
444#include <linux/hwmon.h>
31f5396a
JD		 445
446/* thermal zone devices with the same type share one hwmon device */
447struct thermal_hwmon_device {
448 char type[THERMAL_NAME_LENGTH];
449 struct device *device;
450 int count;
451 struct list_head tz_list;
452 struct list_head node;
453};
454
455struct thermal_hwmon_attr {
456 struct device_attribute attr;
457 char name[16];
458};
459
460/* one temperature input for each thermal zone */
461struct thermal_hwmon_temp {
462 struct list_head hwmon_node;
463 struct thermal_zone_device *tz;
464 struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
465 struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
466};
467
e68b16ab
ZR		 468static LIST_HEAD(thermal_hwmon_list);
469
470static ssize_t
471name_show(struct device *dev, struct device_attribute *attr, char *buf)
472{
0e968a3b 473 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
e68b16ab
ZR		 474 return sprintf(buf, "%s\n", hwmon->type);
475}
476static DEVICE_ATTR(name, 0444, name_show, NULL);
477
478static ssize_t
479temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
480{
6503e5df
MG		 481 long temperature;
482 int ret;
e68b16ab
ZR		 483 struct thermal_hwmon_attr *hwmon_attr
484 = container_of(attr, struct thermal_hwmon_attr, attr);
31f5396a
JD		 485 struct thermal_hwmon_temp *temp
486 = container_of(hwmon_attr, struct thermal_hwmon_temp,
e68b16ab 487 temp_input);
31f5396a 488 struct thermal_zone_device *tz = temp->tz;
e68b16ab 489
6503e5df
MG		 490 ret = tz->ops->get_temp(tz, &temperature);
491
492 if (ret)
493 return ret;
494
495 return sprintf(buf, "%ld\n", temperature);
e68b16ab
ZR		 496}
497
498static ssize_t
499temp_crit_show(struct device *dev, struct device_attribute *attr,
500 char *buf)
501{
502 struct thermal_hwmon_attr *hwmon_attr
503 = container_of(attr, struct thermal_hwmon_attr, attr);
31f5396a
JD		 504 struct thermal_hwmon_temp *temp
505 = container_of(hwmon_attr, struct thermal_hwmon_temp,
e68b16ab 506 temp_crit);
31f5396a 507 struct thermal_zone_device *tz = temp->tz;
6503e5df
MG		 508 long temperature;
509 int ret;
510
511 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
512 if (ret)
513 return ret;
e68b16ab 514
6503e5df 515 return sprintf(buf, "%ld\n", temperature);
e68b16ab
ZR		 516}
517
518
0d97d7a4
JD		 519static struct thermal_hwmon_device *
520thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
e68b16ab
ZR		 521{
522 struct thermal_hwmon_device *hwmon;
e68b16ab
ZR		 523
524 mutex_lock(&thermal_list_lock);
525 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
526 if (!strcmp(hwmon->type, tz->type)) {
e68b16ab 527 mutex_unlock(&thermal_list_lock);
0d97d7a4 528 return hwmon;
e68b16ab
ZR		 529 }
530 mutex_unlock(&thermal_list_lock);
531
0d97d7a4
JD		 532 return NULL;
533}
534
31f5396a
JD		 535/* Find the temperature input matching a given thermal zone */
536static struct thermal_hwmon_temp *
537thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
538 const struct thermal_zone_device *tz)
539{
540 struct thermal_hwmon_temp *temp;
541
542 mutex_lock(&thermal_list_lock);
543 list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
544 if (temp->tz == tz) {
545 mutex_unlock(&thermal_list_lock);
546 return temp;
547 }
548 mutex_unlock(&thermal_list_lock);
549
550 return NULL;
551}
552
0d97d7a4
JD		 553static int
554thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
555{
556 struct thermal_hwmon_device *hwmon;
31f5396a 557 struct thermal_hwmon_temp *temp;
0d97d7a4
JD		 558 int new_hwmon_device = 1;
559 int result;
560
561 hwmon = thermal_hwmon_lookup_by_type(tz);
562 if (hwmon) {
563 new_hwmon_device = 0;
564 goto register_sys_interface;
565 }
566
e68b16ab
ZR		 567 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
568 if (!hwmon)
569 return -ENOMEM;
570
571 INIT_LIST_HEAD(&hwmon->tz_list);
572 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
573 hwmon->device = hwmon_device_register(NULL);
574 if (IS_ERR(hwmon->device)) {
575 result = PTR_ERR(hwmon->device);
576 goto free_mem;
577 }
0e968a3b 578 dev_set_drvdata(hwmon->device, hwmon);
e68b16ab
ZR		 579 result = device_create_file(hwmon->device, &dev_attr_name);
580 if (result)
b299eb5c 581 goto free_mem;
e68b16ab
ZR		 582
583 register_sys_interface:
31f5396a
JD		 584 temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
585 if (!temp) {
586 result = -ENOMEM;
587 goto unregister_name;
588 }
589
590 temp->tz = tz;
e68b16ab
ZR		 591 hwmon->count++;
592
31f5396a 593 snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
e68b16ab 594 "temp%d_input", hwmon->count);
31f5396a
JD		 595 temp->temp_input.attr.attr.name = temp->temp_input.name;
596 temp->temp_input.attr.attr.mode = 0444;
597 temp->temp_input.attr.show = temp_input_show;
598 sysfs_attr_init(&temp->temp_input.attr.attr);
599 result = device_create_file(hwmon->device, &temp->temp_input.attr);
e68b16ab 600 if (result)
31f5396a 601 goto free_temp_mem;
e68b16ab
ZR		 602
603 if (tz->ops->get_crit_temp) {
604 unsigned long temperature;
605 if (!tz->ops->get_crit_temp(tz, &temperature)) {
31f5396a 606 snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
e68b16ab 607 "temp%d_crit", hwmon->count);
31f5396a
JD		 608 temp->temp_crit.attr.attr.name = temp->temp_crit.name;
609 temp->temp_crit.attr.attr.mode = 0444;
610 temp->temp_crit.attr.show = temp_crit_show;
611 sysfs_attr_init(&temp->temp_crit.attr.attr);
e68b16ab 612 result = device_create_file(hwmon->device,
31f5396a 613 &temp->temp_crit.attr);
e68b16ab 614 if (result)
b299eb5c 615 goto unregister_input;
e68b16ab
ZR		 616 }
617 }
618
619 mutex_lock(&thermal_list_lock);
620 if (new_hwmon_device)
621 list_add_tail(&hwmon->node, &thermal_hwmon_list);
31f5396a 622 list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
e68b16ab
ZR		 623 mutex_unlock(&thermal_list_lock);
624
625 return 0;
626
b299eb5c 627 unregister_input:
31f5396a
JD		 628 device_remove_file(hwmon->device, &temp->temp_input.attr);
629 free_temp_mem:
630 kfree(temp);
b299eb5c 631 unregister_name:
e68b16ab
ZR		 632 if (new_hwmon_device) {
633 device_remove_file(hwmon->device, &dev_attr_name);
634 hwmon_device_unregister(hwmon->device);
635 }
636 free_mem:
637 if (new_hwmon_device)
638 kfree(hwmon);
639
640 return result;
641}
642
643static void
644thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
645{
31f5396a
JD		 646 struct thermal_hwmon_device *hwmon;
647 struct thermal_hwmon_temp *temp;
648
649 hwmon = thermal_hwmon_lookup_by_type(tz);
650 if (unlikely(!hwmon)) {
651 /* Should never happen... */
652 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
653 return;
654 }
655
656 temp = thermal_hwmon_lookup_temp(hwmon, tz);
657 if (unlikely(!temp)) {
658 /* Should never happen... */
659 dev_dbg(&tz->device, "temperature input lookup failed!\n");
660 return;
661 }
e68b16ab 662
31f5396a 663 device_remove_file(hwmon->device, &temp->temp_input.attr);
b299eb5c 664 if (tz->ops->get_crit_temp)
31f5396a 665 device_remove_file(hwmon->device, &temp->temp_crit.attr);
e68b16ab
ZR		 666
667 mutex_lock(&thermal_list_lock);
31f5396a
JD		 668 list_del(&temp->hwmon_node);
669 kfree(temp);
e68b16ab
ZR		 670 if (!list_empty(&hwmon->tz_list)) {
671 mutex_unlock(&thermal_list_lock);
672 return;
673 }
674 list_del(&hwmon->node);
675 mutex_unlock(&thermal_list_lock);
676
677 device_remove_file(hwmon->device, &dev_attr_name);
678 hwmon_device_unregister(hwmon->device);
679 kfree(hwmon);
680}
681#else
682static int
683thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
684{
685 return 0;
686}
687
688static void
689thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
690{
691}
692#endif
693
b1569e99
MG		 694static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
695 int delay)
696{
b1569e99 697 if (delay > 1000)
41f63c53
TH		 698 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
699 round_jiffies(msecs_to_jiffies(delay)));
700 else if (delay)
701 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
702 msecs_to_jiffies(delay));
b1569e99 703 else
41f63c53 704 cancel_delayed_work(&tz->poll_queue);
b1569e99
MG		 705}
706
707static void thermal_zone_device_passive(struct thermal_zone_device *tz,
708 int temp, int trip_temp, int trip)
709{
710 int trend = 0;
711 struct thermal_cooling_device_instance *instance;
712 struct thermal_cooling_device *cdev;
713 long state, max_state;
714
715 /*
716 * Above Trip?
717 * -----------
718 * Calculate the thermal trend (using the passive cooling equation)
719 * and modify the performance limit for all passive cooling devices
720 * accordingly. Note that we assume symmetry.
721 */
722 if (temp >= trip_temp) {
723 tz->passive = true;
724
725 trend = (tz->tc1 * (temp - tz->last_temperature)) +
726 (tz->tc2 * (temp - trip_temp));
727
728 /* Heating up? */
729 if (trend > 0) {
730 list_for_each_entry(instance, &tz->cooling_devices,
731 node) {
732 if (instance->trip != trip)
733 continue;
734 cdev = instance->cdev;
735 cdev->ops->get_cur_state(cdev, &state);
736 cdev->ops->get_max_state(cdev, &max_state);
737 if (state++ < max_state)
738 cdev->ops->set_cur_state(cdev, state);
739 }
740 } else if (trend < 0) { /* Cooling off? */
741 list_for_each_entry(instance, &tz->cooling_devices,
742 node) {
743 if (instance->trip != trip)
744 continue;
745 cdev = instance->cdev;
746 cdev->ops->get_cur_state(cdev, &state);
747 cdev->ops->get_max_state(cdev, &max_state);
748 if (state > 0)
749 cdev->ops->set_cur_state(cdev, --state);
750 }
751 }
752 return;
753 }
754
755 /*
756 * Below Trip?
757 * -----------
758 * Implement passive cooling hysteresis to slowly increase performance
759 * and avoid thrashing around the passive trip point. Note that we
760 * assume symmetry.
761 */
762 list_for_each_entry(instance, &tz->cooling_devices, node) {
763 if (instance->trip != trip)
764 continue;
765 cdev = instance->cdev;
766 cdev->ops->get_cur_state(cdev, &state);
767 cdev->ops->get_max_state(cdev, &max_state);
768 if (state > 0)
769 cdev->ops->set_cur_state(cdev, --state);
770 if (state == 0)
771 tz->passive = false;
772 }
773}
774
775static void thermal_zone_device_check(struct work_struct *work)
776{
777 struct thermal_zone_device *tz = container_of(work, struct
778 thermal_zone_device,
779 poll_queue.work);
780 thermal_zone_device_update(tz);
781}
e68b16ab 782
203d3d4a
ZR		 783/**
784 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
203d3d4a
ZR		 785 * @tz: thermal zone device
786 * @trip: indicates which trip point the cooling devices is
787 * associated with in this thermal zone.
788 * @cdev: thermal cooling device
543a9561
LB		 789 *
790 * This function is usually called in the thermal zone device .bind callback.
203d3d4a
ZR		 791 */
792int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
793 int trip,
794 struct thermal_cooling_device *cdev)
795{
796 struct thermal_cooling_device_instance *dev;
797 struct thermal_cooling_device_instance *pos;
c7516709
TS		 798 struct thermal_zone_device *pos1;
799 struct thermal_cooling_device *pos2;
203d3d4a
ZR		 800 int result;
801
543a9561 802 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
203d3d4a
ZR		 803 return -EINVAL;
804
c7516709
TS		 805 list_for_each_entry(pos1, &thermal_tz_list, node) {
806 if (pos1 == tz)
807 break;
808 }
809 list_for_each_entry(pos2, &thermal_cdev_list, node) {
810 if (pos2 == cdev)
811 break;
812 }
813
814 if (tz != pos1 || cdev != pos2)
203d3d4a
ZR		 815 return -EINVAL;
816
817 dev =
818 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
819 if (!dev)
820 return -ENOMEM;
821 dev->tz = tz;
822 dev->cdev = cdev;
823 dev->trip = trip;
824 result = get_idr(&tz->idr, &tz->lock, &dev->id);
825 if (result)
826 goto free_mem;
827
828 sprintf(dev->name, "cdev%d", dev->id);
829 result =
830 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
831 if (result)
832 goto release_idr;
833
834 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
975f8c56 835 sysfs_attr_init(&dev->attr.attr);
203d3d4a
ZR		 836 dev->attr.attr.name = dev->attr_name;
837 dev->attr.attr.mode = 0444;
838 dev->attr.show = thermal_cooling_device_trip_point_show;
839 result = device_create_file(&tz->device, &dev->attr);
840 if (result)
841 goto remove_symbol_link;
842
843 mutex_lock(&tz->lock);
844 list_for_each_entry(pos, &tz->cooling_devices, node)
845 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
846 result = -EEXIST;
847 break;
848 }
849 if (!result)
850 list_add_tail(&dev->node, &tz->cooling_devices);
851 mutex_unlock(&tz->lock);
852
853 if (!result)
854 return 0;
855
856 device_remove_file(&tz->device, &dev->attr);
caca8b80 857remove_symbol_link:
203d3d4a 858 sysfs_remove_link(&tz->device.kobj, dev->name);
caca8b80 859release_idr:
203d3d4a 860 release_idr(&tz->idr, &tz->lock, dev->id);
caca8b80 861free_mem:
203d3d4a
ZR		 862 kfree(dev);
863 return result;
864}
865EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
866
867/**
868 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
203d3d4a
ZR		 869 * @tz: thermal zone device
870 * @trip: indicates which trip point the cooling devices is
871 * associated with in this thermal zone.
872 * @cdev: thermal cooling device
543a9561
LB		 873 *
874 * This function is usually called in the thermal zone device .unbind callback.
203d3d4a
ZR		 875 */
876int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
877 int trip,
878 struct thermal_cooling_device *cdev)
879{
880 struct thermal_cooling_device_instance *pos, *next;
881
882 mutex_lock(&tz->lock);
883 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
543a9561 884 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
203d3d4a
ZR		 885 list_del(&pos->node);
886 mutex_unlock(&tz->lock);
887 goto unbind;
888 }
889 }
890 mutex_unlock(&tz->lock);
891
892 return -ENODEV;
893
caca8b80 894unbind:
203d3d4a
ZR		 895 device_remove_file(&tz->device, &pos->attr);
896 sysfs_remove_link(&tz->device.kobj, pos->name);
897 release_idr(&tz->idr, &tz->lock, pos->id);
898 kfree(pos);
899 return 0;
900}
901EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
902
903static void thermal_release(struct device *dev)
904{
905 struct thermal_zone_device *tz;
906 struct thermal_cooling_device *cdev;
907
caca8b80
JP		 908 if (!strncmp(dev_name(dev), "thermal_zone",
909 sizeof("thermal_zone") - 1)) {
203d3d4a
ZR		 910 tz = to_thermal_zone(dev);
911 kfree(tz);
912 } else {
913 cdev = to_cooling_device(dev);
914 kfree(cdev);
915 }
916}
917
918static struct class thermal_class = {
919 .name = "thermal",
920 .dev_release = thermal_release,
921};
922
923/**
924 * thermal_cooling_device_register - register a new thermal cooling device
925 * @type: the thermal cooling device type.
926 * @devdata: device private data.
927 * @ops: standard thermal cooling devices callbacks.
928 */
caca8b80
JP		 929struct thermal_cooling_device *
930thermal_cooling_device_register(char *type, void *devdata,
931 const struct thermal_cooling_device_ops *ops)
203d3d4a
ZR		 932{
933 struct thermal_cooling_device *cdev;
934 struct thermal_zone_device *pos;
935 int result;
936
937 if (strlen(type) >= THERMAL_NAME_LENGTH)
3e6fda5c 938 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 939
940 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
543a9561 941 !ops->set_cur_state)
3e6fda5c 942 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 943
944 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
945 if (!cdev)
3e6fda5c 946 return ERR_PTR(-ENOMEM);
203d3d4a
ZR		 947
948 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
949 if (result) {
950 kfree(cdev);
3e6fda5c 951 return ERR_PTR(result);
203d3d4a
ZR		 952 }
953
954 strcpy(cdev->type, type);
955 cdev->ops = ops;
956 cdev->device.class = &thermal_class;
957 cdev->devdata = devdata;
354655ea 958 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
203d3d4a
ZR		 959 result = device_register(&cdev->device);
960 if (result) {
961 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
962 kfree(cdev);
3e6fda5c 963 return ERR_PTR(result);
203d3d4a
ZR		 964 }
965
966 /* sys I/F */
967 if (type) {
543a9561 968 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
203d3d4a
ZR		 969 if (result)
970 goto unregister;
971 }
972
973 result = device_create_file(&cdev->device, &dev_attr_max_state);
974 if (result)
975 goto unregister;
976
977 result = device_create_file(&cdev->device, &dev_attr_cur_state);
978 if (result)
979 goto unregister;
980
981 mutex_lock(&thermal_list_lock);
982 list_add(&cdev->node, &thermal_cdev_list);
983 list_for_each_entry(pos, &thermal_tz_list, node) {
984 if (!pos->ops->bind)
985 continue;
986 result = pos->ops->bind(pos, cdev);
987 if (result)
988 break;
989
990 }
991 mutex_unlock(&thermal_list_lock);
992
993 if (!result)
994 return cdev;
995
caca8b80 996unregister:
203d3d4a
ZR		 997 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
998 device_unregister(&cdev->device);
3e6fda5c 999 return ERR_PTR(result);
203d3d4a
ZR		 1000}
1001EXPORT_SYMBOL(thermal_cooling_device_register);
1002
1003/**
1004 * thermal_cooling_device_unregister - removes the registered thermal cooling device
203d3d4a
ZR		 1005 * @cdev: the thermal cooling device to remove.
1006 *
1007 * thermal_cooling_device_unregister() must be called when the device is no
1008 * longer needed.
1009 */
1010void thermal_cooling_device_unregister(struct
1011 thermal_cooling_device
1012 *cdev)
1013{
1014 struct thermal_zone_device *tz;
1015 struct thermal_cooling_device *pos = NULL;
1016
1017 if (!cdev)
1018 return;
1019
1020 mutex_lock(&thermal_list_lock);
1021 list_for_each_entry(pos, &thermal_cdev_list, node)
1022 if (pos == cdev)
1023 break;
1024 if (pos != cdev) {
1025 /* thermal cooling device not found */
1026 mutex_unlock(&thermal_list_lock);
1027 return;
1028 }
1029 list_del(&cdev->node);
1030 list_for_each_entry(tz, &thermal_tz_list, node) {
1031 if (!tz->ops->unbind)
1032 continue;
1033 tz->ops->unbind(tz, cdev);
1034 }
1035 mutex_unlock(&thermal_list_lock);
1036 if (cdev->type[0])
543a9561 1037 device_remove_file(&cdev->device, &dev_attr_cdev_type);
203d3d4a
ZR		 1038 device_remove_file(&cdev->device, &dev_attr_max_state);
1039 device_remove_file(&cdev->device, &dev_attr_cur_state);
1040
1041 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1042 device_unregister(&cdev->device);
1043 return;
1044}
1045EXPORT_SYMBOL(thermal_cooling_device_unregister);
1046
b1569e99
MG		 1047/**
1048 * thermal_zone_device_update - force an update of a thermal zone's state
1049 * @ttz: the thermal zone to update
1050 */
1051
1052void thermal_zone_device_update(struct thermal_zone_device *tz)
1053{
1054 int count, ret = 0;
1055 long temp, trip_temp;
1056 enum thermal_trip_type trip_type;
1057 struct thermal_cooling_device_instance *instance;
1058 struct thermal_cooling_device *cdev;
1059
1060 mutex_lock(&tz->lock);
1061
0d288162
MB		 1062 if (tz->ops->get_temp(tz, &temp)) {
1063 /* get_temp failed - retry it later */
c5a01dd5 1064 pr_warn("failed to read out thermal zone %d\n", tz->id);
0d288162
MB		 1065 goto leave;
1066 }
b1569e99
MG		 1067
1068 for (count = 0; count < tz->trips; count++) {
1069 tz->ops->get_trip_type(tz, count, &trip_type);
1070 tz->ops->get_trip_temp(tz, count, &trip_temp);
1071
1072 switch (trip_type) {
1073 case THERMAL_TRIP_CRITICAL:
29321357 1074 if (temp >= trip_temp) {
b1569e99
MG		 1075 if (tz->ops->notify)
1076 ret = tz->ops->notify(tz, count,
1077 trip_type);
1078 if (!ret) {
c5a01dd5
JP		 1079 pr_emerg("Critical temperature reached (%ld C), shutting down\n",
1080 temp/1000);
b1569e99
MG		 1081 orderly_poweroff(true);
1082 }
1083 }
1084 break;
1085 case THERMAL_TRIP_HOT:
29321357 1086 if (temp >= trip_temp)
b1569e99
MG		 1087 if (tz->ops->notify)
1088 tz->ops->notify(tz, count, trip_type);
1089 break;
1090 case THERMAL_TRIP_ACTIVE:
1091 list_for_each_entry(instance, &tz->cooling_devices,
1092 node) {
1093 if (instance->trip != count)
1094 continue;
1095
1096 cdev = instance->cdev;
1097
29321357 1098 if (temp >= trip_temp)
b1569e99
MG		 1099 cdev->ops->set_cur_state(cdev, 1);
1100 else
1101 cdev->ops->set_cur_state(cdev, 0);
1102 }
1103 break;
1104 case THERMAL_TRIP_PASSIVE:
29321357 1105 if (temp >= trip_temp || tz->passive)
b1569e99
MG		 1106 thermal_zone_device_passive(tz, temp,
1107 trip_temp, count);
1108 break;
1109 }
1110 }
03a971a2
MG		 1111
1112 if (tz->forced_passive)
1113 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1114 THERMAL_TRIPS_NONE);
1115
b1569e99 1116 tz->last_temperature = temp;
0d288162 1117
caca8b80 1118leave:
b1569e99
MG		 1119 if (tz->passive)
1120 thermal_zone_device_set_polling(tz, tz->passive_delay);
1121 else if (tz->polling_delay)
1122 thermal_zone_device_set_polling(tz, tz->polling_delay);
3767cb54
FP		 1123 else
1124 thermal_zone_device_set_polling(tz, 0);
b1569e99
MG		 1125 mutex_unlock(&tz->lock);
1126}
1127EXPORT_SYMBOL(thermal_zone_device_update);
1128
c56f5c03
D		 1129/**
1130 * create_trip_attrs - create attributes for trip points
1131 * @tz: the thermal zone device
1132 * @mask: Writeable trip point bitmap.
1133 */
1134static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1135{
1136 int indx;
27365a6c 1137 int size = sizeof(struct thermal_attr) * tz->trips;
c56f5c03 1138
27365a6c 1139 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
c56f5c03
D		 1140 if (!tz->trip_type_attrs)
1141 return -ENOMEM;
1142
27365a6c 1143 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
c56f5c03
D		 1144 if (!tz->trip_temp_attrs) {
1145 kfree(tz->trip_type_attrs);
1146 return -ENOMEM;
1147 }
1148
27365a6c
D		 1149 if (tz->ops->get_trip_hyst) {
1150 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1151 if (!tz->trip_hyst_attrs) {
1152 kfree(tz->trip_type_attrs);
1153 kfree(tz->trip_temp_attrs);
1154 return -ENOMEM;
1155 }
1156 }
c56f5c03 1157
27365a6c
D		 1158
1159 for (indx = 0; indx < tz->trips; indx++) {
c56f5c03
D		 1160 /* create trip type attribute */
1161 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1162 "trip_point_%d_type", indx);
1163
1164 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1165 tz->trip_type_attrs[indx].attr.attr.name =
1166 tz->trip_type_attrs[indx].name;
1167 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1168 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1169
1170 device_create_file(&tz->device,
1171 &tz->trip_type_attrs[indx].attr);
1172
1173 /* create trip temp attribute */
1174 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1175 "trip_point_%d_temp", indx);
1176
1177 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1178 tz->trip_temp_attrs[indx].attr.attr.name =
1179 tz->trip_temp_attrs[indx].name;
1180 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1181 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1182 if (mask & (1 << indx)) {
1183 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1184 tz->trip_temp_attrs[indx].attr.store =
1185 trip_point_temp_store;
1186 }
1187
1188 device_create_file(&tz->device,
1189 &tz->trip_temp_attrs[indx].attr);
27365a6c
D		 1190
1191 /* create Optional trip hyst attribute */
1192 if (!tz->ops->get_trip_hyst)
1193 continue;
1194 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1195 "trip_point_%d_hyst", indx);
1196
1197 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1198 tz->trip_hyst_attrs[indx].attr.attr.name =
1199 tz->trip_hyst_attrs[indx].name;
1200 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1201 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1202 if (tz->ops->set_trip_hyst) {
1203 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1204 tz->trip_hyst_attrs[indx].attr.store =
1205 trip_point_hyst_store;
1206 }
1207
1208 device_create_file(&tz->device,
1209 &tz->trip_hyst_attrs[indx].attr);
c56f5c03
D		 1210 }
1211 return 0;
1212}
1213
1214static void remove_trip_attrs(struct thermal_zone_device *tz)
1215{
1216 int indx;
1217
1218 for (indx = 0; indx < tz->trips; indx++) {
1219 device_remove_file(&tz->device,
1220 &tz->trip_type_attrs[indx].attr);
1221 device_remove_file(&tz->device,
1222 &tz->trip_temp_attrs[indx].attr);
27365a6c
D		 1223 if (tz->ops->get_trip_hyst)
1224 device_remove_file(&tz->device,
1225 &tz->trip_hyst_attrs[indx].attr);
c56f5c03
D		 1226 }
1227 kfree(tz->trip_type_attrs);
1228 kfree(tz->trip_temp_attrs);
27365a6c 1229 kfree(tz->trip_hyst_attrs);
c56f5c03
D		 1230}
1231
203d3d4a
ZR		 1232/**
1233 * thermal_zone_device_register - register a new thermal zone device
1234 * @type: the thermal zone device type
1235 * @trips: the number of trip points the thermal zone support
c56f5c03 1236 * @mask: a bit string indicating the writeablility of trip points
203d3d4a
ZR		 1237 * @devdata: private device data
1238 * @ops: standard thermal zone device callbacks
b1569e99
MG		 1239 * @tc1: thermal coefficient 1 for passive calculations
1240 * @tc2: thermal coefficient 2 for passive calculations
1241 * @passive_delay: number of milliseconds to wait between polls when
1242 * performing passive cooling
1243 * @polling_delay: number of milliseconds to wait between polls when checking
1244 * whether trip points have been crossed (0 for interrupt
1245 * driven systems)
203d3d4a
ZR		 1246 *
1247 * thermal_zone_device_unregister() must be called when the device is no
b1569e99
MG		 1248 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1249 * section 11.1.5.1 of the ACPI specification 3.0.
203d3d4a 1250 */
4b1bf587 1251struct thermal_zone_device *thermal_zone_device_register(const char *type,
c56f5c03 1252 int trips, int mask, void *devdata,
5b275ce2
AC		 1253 const struct thermal_zone_device_ops *ops,
1254 int tc1, int tc2, int passive_delay, int polling_delay)
203d3d4a
ZR		 1255{
1256 struct thermal_zone_device *tz;
1257 struct thermal_cooling_device *pos;
03a971a2 1258 enum thermal_trip_type trip_type;
203d3d4a
ZR		 1259 int result;
1260 int count;
03a971a2 1261 int passive = 0;
203d3d4a
ZR		 1262
1263 if (strlen(type) >= THERMAL_NAME_LENGTH)
3e6fda5c 1264 return ERR_PTR(-EINVAL);
203d3d4a 1265
c56f5c03 1266 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
3e6fda5c 1267 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 1268
1269 if (!ops || !ops->get_temp)
3e6fda5c 1270 return ERR_PTR(-EINVAL);
203d3d4a
ZR		 1271
1272 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1273 if (!tz)
3e6fda5c 1274 return ERR_PTR(-ENOMEM);
203d3d4a
ZR		 1275
1276 INIT_LIST_HEAD(&tz->cooling_devices);
1277 idr_init(&tz->idr);
1278 mutex_init(&tz->lock);
1279 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1280 if (result) {
1281 kfree(tz);
3e6fda5c 1282 return ERR_PTR(result);
203d3d4a
ZR		 1283 }
1284
1285 strcpy(tz->type, type);
1286 tz->ops = ops;
1287 tz->device.class = &thermal_class;
1288 tz->devdata = devdata;
1289 tz->trips = trips;
b1569e99
MG		 1290 tz->tc1 = tc1;
1291 tz->tc2 = tc2;
1292 tz->passive_delay = passive_delay;
1293 tz->polling_delay = polling_delay;
1294
354655ea 1295 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
203d3d4a
ZR		 1296 result = device_register(&tz->device);
1297 if (result) {
1298 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1299 kfree(tz);
3e6fda5c 1300 return ERR_PTR(result);
203d3d4a
ZR		 1301 }
1302
1303 /* sys I/F */
1304 if (type) {
1305 result = device_create_file(&tz->device, &dev_attr_type);
1306 if (result)
1307 goto unregister;
1308 }
1309
1310 result = device_create_file(&tz->device, &dev_attr_temp);
1311 if (result)
1312 goto unregister;
1313
1314 if (ops->get_mode) {
1315 result = device_create_file(&tz->device, &dev_attr_mode);
1316 if (result)
1317 goto unregister;
1318 }
1319
c56f5c03
D		 1320 result = create_trip_attrs(tz, mask);
1321 if (result)
1322 goto unregister;
1323
203d3d4a 1324 for (count = 0; count < trips; count++) {
03a971a2
MG		 1325 tz->ops->get_trip_type(tz, count, &trip_type);
1326 if (trip_type == THERMAL_TRIP_PASSIVE)
1327 passive = 1;
203d3d4a
ZR		 1328 }
1329
03a971a2
MG		 1330 if (!passive)
1331 result = device_create_file(&tz->device,
1332 &dev_attr_passive);
1333
1334 if (result)
1335 goto unregister;
1336
e68b16ab
ZR		 1337 result = thermal_add_hwmon_sysfs(tz);
1338 if (result)
1339 goto unregister;
1340
203d3d4a
ZR		 1341 mutex_lock(&thermal_list_lock);
1342 list_add_tail(&tz->node, &thermal_tz_list);
1343 if (ops->bind)
1344 list_for_each_entry(pos, &thermal_cdev_list, node) {
543a9561
LB		 1345 result = ops->bind(tz, pos);
1346 if (result)
1347 break;
203d3d4a
ZR		 1348 }
1349 mutex_unlock(&thermal_list_lock);
1350
b1569e99
MG		 1351 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1352
1353 thermal_zone_device_update(tz);
1354
203d3d4a
ZR		 1355 if (!result)
1356 return tz;
1357
caca8b80 1358unregister:
203d3d4a
ZR		 1359 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1360 device_unregister(&tz->device);
3e6fda5c 1361 return ERR_PTR(result);
203d3d4a
ZR		 1362}
1363EXPORT_SYMBOL(thermal_zone_device_register);
1364
1365/**
1366 * thermal_device_unregister - removes the registered thermal zone device
203d3d4a
ZR		 1367 * @tz: the thermal zone device to remove
1368 */
1369void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1370{
1371 struct thermal_cooling_device *cdev;
1372 struct thermal_zone_device *pos = NULL;
203d3d4a
ZR		 1373
1374 if (!tz)
1375 return;
1376
1377 mutex_lock(&thermal_list_lock);
1378 list_for_each_entry(pos, &thermal_tz_list, node)
1379 if (pos == tz)
1380 break;
1381 if (pos != tz) {
1382 /* thermal zone device not found */
1383 mutex_unlock(&thermal_list_lock);
1384 return;
1385 }
1386 list_del(&tz->node);
1387 if (tz->ops->unbind)
1388 list_for_each_entry(cdev, &thermal_cdev_list, node)
1389 tz->ops->unbind(tz, cdev);
1390 mutex_unlock(&thermal_list_lock);
1391
b1569e99
MG		 1392 thermal_zone_device_set_polling(tz, 0);
1393
203d3d4a
ZR		 1394 if (tz->type[0])
1395 device_remove_file(&tz->device, &dev_attr_type);
1396 device_remove_file(&tz->device, &dev_attr_temp);
1397 if (tz->ops->get_mode)
1398 device_remove_file(&tz->device, &dev_attr_mode);
c56f5c03 1399 remove_trip_attrs(tz);
203d3d4a 1400
e68b16ab 1401 thermal_remove_hwmon_sysfs(tz);
203d3d4a
ZR		 1402 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1403 idr_destroy(&tz->idr);
1404 mutex_destroy(&tz->lock);
1405 device_unregister(&tz->device);
1406 return;
1407}
1408EXPORT_SYMBOL(thermal_zone_device_unregister);
1409
af06216a
RW		 1410#ifdef CONFIG_NET
1411static struct genl_family thermal_event_genl_family = {
1412 .id = GENL_ID_GENERATE,
1413 .name = THERMAL_GENL_FAMILY_NAME,
1414 .version = THERMAL_GENL_VERSION,
1415 .maxattr = THERMAL_GENL_ATTR_MAX,
1416};
1417
1418static struct genl_multicast_group thermal_event_mcgrp = {
1419 .name = THERMAL_GENL_MCAST_GROUP_NAME,
1420};
1421
2d58d7ea 1422int thermal_generate_netlink_event(u32 orig, enum events event)
4cb18728
D		 1423{
1424 struct sk_buff *skb;
1425 struct nlattr *attr;
1426 struct thermal_genl_event *thermal_event;
1427 void *msg_header;
1428 int size;
1429 int result;
b11de07c 1430 static unsigned int thermal_event_seqnum;
4cb18728
D		 1431
1432 /* allocate memory */
886ee546
JP		 1433 size = nla_total_size(sizeof(struct thermal_genl_event)) +
1434 nla_total_size(0);
4cb18728
D		 1435
1436 skb = genlmsg_new(size, GFP_ATOMIC);
1437 if (!skb)
1438 return -ENOMEM;
1439
1440 /* add the genetlink message header */
1441 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1442 &thermal_event_genl_family, 0,
1443 THERMAL_GENL_CMD_EVENT);
1444 if (!msg_header) {
1445 nlmsg_free(skb);
1446 return -ENOMEM;
1447 }
1448
1449 /* fill the data */
886ee546
JP		 1450 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1451 sizeof(struct thermal_genl_event));
4cb18728
D		 1452
1453 if (!attr) {
1454 nlmsg_free(skb);
1455 return -EINVAL;
1456 }
1457
1458 thermal_event = nla_data(attr);
1459 if (!thermal_event) {
1460 nlmsg_free(skb);
1461 return -EINVAL;
1462 }
1463
1464 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1465
1466 thermal_event->orig = orig;
1467 thermal_event->event = event;
1468
1469 /* send multicast genetlink message */
1470 result = genlmsg_end(skb, msg_header);
1471 if (result < 0) {
1472 nlmsg_free(skb);
1473 return result;
1474 }
1475
1476 result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1477 if (result)
c5a01dd5 1478 pr_info("failed to send netlink event:%d\n", result);
4cb18728
D		 1479
1480 return result;
1481}
2d58d7ea 1482EXPORT_SYMBOL(thermal_generate_netlink_event);
4cb18728
D		 1483
1484static int genetlink_init(void)
1485{
1486 int result;
1487
1488 result = genl_register_family(&thermal_event_genl_family);
1489 if (result)
1490 return result;
1491
1492 result = genl_register_mc_group(&thermal_event_genl_family,
1493 &thermal_event_mcgrp);
1494 if (result)
1495 genl_unregister_family(&thermal_event_genl_family);
1496 return result;
1497}
1498
af06216a
RW		 1499static void genetlink_exit(void)
1500{
1501 genl_unregister_family(&thermal_event_genl_family);
1502}
1503#else /* !CONFIG_NET */
1504static inline int genetlink_init(void) { return 0; }
1505static inline void genetlink_exit(void) {}
1506#endif /* !CONFIG_NET */
1507
203d3d4a
ZR		 1508static int __init thermal_init(void)
1509{
1510 int result = 0;
1511
1512 result = class_register(&thermal_class);
1513 if (result) {
1514 idr_destroy(&thermal_tz_idr);
1515 idr_destroy(&thermal_cdev_idr);
1516 mutex_destroy(&thermal_idr_lock);
1517 mutex_destroy(&thermal_list_lock);
1518 }
4cb18728 1519 result = genetlink_init();
203d3d4a
ZR		 1520 return result;
1521}
1522
1523static void __exit thermal_exit(void)
1524{
1525 class_unregister(&thermal_class);
1526 idr_destroy(&thermal_tz_idr);
1527 idr_destroy(&thermal_cdev_idr);
1528 mutex_destroy(&thermal_idr_lock);
1529 mutex_destroy(&thermal_list_lock);
4cb18728 1530 genetlink_exit();
203d3d4a
ZR		 1531}
1532
4cb18728 1533fs_initcall(thermal_init);
203d3d4a 1534module_exit(thermal_exit);
kernel source for telekom puls (alcatel/mediatek)