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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / thermal / thermal_sys.c
blob4e83c297ec9efdc191c084f913637b8aaa0e7d2f
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 #include <linux/reboot.h>
34
35 MODULE_AUTHOR("Zhang Rui");
36 MODULE_DESCRIPTION("Generic thermal management sysfs support");
37 MODULE_LICENSE("GPL");
38
39 #define PREFIX "Thermal: "
40
41 struct 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
52 static DEFINE_IDR(thermal_tz_idr);
53 static DEFINE_IDR(thermal_cdev_idr);
54 static DEFINE_MUTEX(thermal_idr_lock);
55
56 static LIST_HEAD(thermal_tz_list);
57 static LIST_HEAD(thermal_cdev_list);
58 static DEFINE_MUTEX(thermal_list_lock);
59
60 static 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
82 static 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
96 static ssize_t
97 type_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
104 static ssize_t
105 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
106 {
107 struct thermal_zone_device *tz = to_thermal_zone(dev);
108 long temperature;
109 int ret;
110
111 if (!tz->ops->get_temp)
112 return -EPERM;
113
114 ret = tz->ops->get_temp(tz, &temperature);
115
116 if (ret)
117 return ret;
118
119 return sprintf(buf, "%ld\n", temperature);
120 }
121
122 static ssize_t
123 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
124 {
125 struct thermal_zone_device *tz = to_thermal_zone(dev);
126 enum thermal_device_mode mode;
127 int result;
128
129 if (!tz->ops->get_mode)
130 return -EPERM;
131
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");
138 }
139
140 static ssize_t
141 mode_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
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
157 if (result)
158 return result;
159
160 return count;
161 }
162
163 static ssize_t
164 trip_point_type_show(struct device *dev, struct device_attribute *attr,
165 char *buf)
166 {
167 struct thermal_zone_device *tz = to_thermal_zone(dev);
168 enum thermal_trip_type type;
169 int trip, result;
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
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 }
193 }
194
195 static ssize_t
196 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
197 char *buf)
198 {
199 struct thermal_zone_device *tz = to_thermal_zone(dev);
200 int trip, ret;
201 long temperature;
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
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);
215 }
216
217 static ssize_t
218 passive_store(struct device *dev, struct device_attribute *attr,
219 const char *buf, size_t count)
220 {
221 struct thermal_zone_device *tz = to_thermal_zone(dev);
222 struct thermal_cooling_device *cdev = NULL;
223 int state;
224
225 if (!sscanf(buf, "%d\n", &state))
226 return -EINVAL;
227
228 if (state && !tz->forced_passive) {
229 mutex_lock(&thermal_list_lock);
230 list_for_each_entry(cdev, &thermal_cdev_list, node) {
231 if (!strncmp("Processor", cdev->type,
232 sizeof("Processor")))
233 thermal_zone_bind_cooling_device(tz,
234 THERMAL_TRIPS_NONE,
235 cdev);
236 }
237 mutex_unlock(&thermal_list_lock);
238 } else if (!state && tz->forced_passive) {
239 mutex_lock(&thermal_list_lock);
240 list_for_each_entry(cdev, &thermal_cdev_list, node) {
241 if (!strncmp("Processor", cdev->type,
242 sizeof("Processor")))
243 thermal_zone_unbind_cooling_device(tz,
244 THERMAL_TRIPS_NONE,
245 cdev);
246 }
247 mutex_unlock(&thermal_list_lock);
248 }
249
250 tz->tc1 = 1;
251 tz->tc2 = 1;
252
253 if (!tz->passive_delay)
254 tz->passive_delay = 1000;
255
256 if (!tz->polling_delay)
257 tz->polling_delay = 10000;
258
259 tz->forced_passive = state;
260
261 thermal_zone_device_update(tz);
262
263 return count;
264 }
265
266 static ssize_t
267 passive_show(struct device *dev, struct device_attribute *attr,
268 char *buf)
269 {
270 struct thermal_zone_device *tz = to_thermal_zone(dev);
271
272 return sprintf(buf, "%d\n", tz->forced_passive);
273 }
274
275 static DEVICE_ATTR(type, 0444, type_show, NULL);
276 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
277 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
278 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
279 passive_store);
280
281 static struct device_attribute trip_point_attrs[] = {
282 __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
283 __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
284 __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
285 __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
286 __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
287 __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
288 __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
289 __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
290 __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
291 __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
292 __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
293 __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
294 __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
295 __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
296 __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
297 __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
298 __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
299 __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
300 __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
301 __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
302 __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
303 __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
304 __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
305 __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
306 };
307
308 #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
309 do { \
310 result = device_create_file(_dev, \
311 &trip_point_attrs[_index * 2]); \
312 if (result) \
313 break; \
314 result = device_create_file(_dev, \
315 &trip_point_attrs[_index * 2 + 1]); \
316 } while (0)
317
318 #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
319 do { \
320 device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
321 device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
322 } while (0)
323
324 /* sys I/F for cooling device */
325 #define to_cooling_device(_dev) \
326 container_of(_dev, struct thermal_cooling_device, device)
327
328 static ssize_t
329 thermal_cooling_device_type_show(struct device *dev,
330 struct device_attribute *attr, char *buf)
331 {
332 struct thermal_cooling_device *cdev = to_cooling_device(dev);
333
334 return sprintf(buf, "%s\n", cdev->type);
335 }
336
337 static ssize_t
338 thermal_cooling_device_max_state_show(struct device *dev,
339 struct device_attribute *attr, char *buf)
340 {
341 struct thermal_cooling_device *cdev = to_cooling_device(dev);
342 unsigned long state;
343 int ret;
344
345 ret = cdev->ops->get_max_state(cdev, &state);
346 if (ret)
347 return ret;
348 return sprintf(buf, "%ld\n", state);
349 }
350
351 static ssize_t
352 thermal_cooling_device_cur_state_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
354 {
355 struct thermal_cooling_device *cdev = to_cooling_device(dev);
356 unsigned long state;
357 int ret;
358
359 ret = cdev->ops->get_cur_state(cdev, &state);
360 if (ret)
361 return ret;
362 return sprintf(buf, "%ld\n", state);
363 }
364
365 static ssize_t
366 thermal_cooling_device_cur_state_store(struct device *dev,
367 struct device_attribute *attr,
368 const char *buf, size_t count)
369 {
370 struct thermal_cooling_device *cdev = to_cooling_device(dev);
371 unsigned long state;
372 int result;
373
374 if (!sscanf(buf, "%ld\n", &state))
375 return -EINVAL;
376
377 if (state < 0)
378 return -EINVAL;
379
380 result = cdev->ops->set_cur_state(cdev, state);
381 if (result)
382 return result;
383 return count;
384 }
385
386 static struct device_attribute dev_attr_cdev_type =
387 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
388 static DEVICE_ATTR(max_state, 0444,
389 thermal_cooling_device_max_state_show, NULL);
390 static DEVICE_ATTR(cur_state, 0644,
391 thermal_cooling_device_cur_state_show,
392 thermal_cooling_device_cur_state_store);
393
394 static ssize_t
395 thermal_cooling_device_trip_point_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397 {
398 struct thermal_cooling_device_instance *instance;
399
400 instance =
401 container_of(attr, struct thermal_cooling_device_instance, attr);
402
403 if (instance->trip == THERMAL_TRIPS_NONE)
404 return sprintf(buf, "-1\n");
405 else
406 return sprintf(buf, "%d\n", instance->trip);
407 }
408
409 /* Device management */
410
411 #if defined(CONFIG_THERMAL_HWMON)
412
413 /* hwmon sys I/F */
414 #include <linux/hwmon.h>
415 static LIST_HEAD(thermal_hwmon_list);
416
417 static ssize_t
418 name_show(struct device *dev, struct device_attribute *attr, char *buf)
419 {
420 struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
421 return sprintf(buf, "%s\n", hwmon->type);
422 }
423 static DEVICE_ATTR(name, 0444, name_show, NULL);
424
425 static ssize_t
426 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
427 {
428 long temperature;
429 int ret;
430 struct thermal_hwmon_attr *hwmon_attr
431 = container_of(attr, struct thermal_hwmon_attr, attr);
432 struct thermal_zone_device *tz
433 = container_of(hwmon_attr, struct thermal_zone_device,
434 temp_input);
435
436 ret = tz->ops->get_temp(tz, &temperature);
437
438 if (ret)
439 return ret;
440
441 return sprintf(buf, "%ld\n", temperature);
442 }
443
444 static ssize_t
445 temp_crit_show(struct device *dev, struct device_attribute *attr,
446 char *buf)
447 {
448 struct thermal_hwmon_attr *hwmon_attr
449 = container_of(attr, struct thermal_hwmon_attr, attr);
450 struct thermal_zone_device *tz
451 = container_of(hwmon_attr, struct thermal_zone_device,
452 temp_crit);
453 long temperature;
454 int ret;
455
456 ret = tz->ops->get_trip_temp(tz, 0, &temperature);
457 if (ret)
458 return ret;
459
460 return sprintf(buf, "%ld\n", temperature);
461 }
462
463
464 static int
465 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
466 {
467 struct thermal_hwmon_device *hwmon;
468 int new_hwmon_device = 1;
469 int result;
470
471 mutex_lock(&thermal_list_lock);
472 list_for_each_entry(hwmon, &thermal_hwmon_list, node)
473 if (!strcmp(hwmon->type, tz->type)) {
474 new_hwmon_device = 0;
475 mutex_unlock(&thermal_list_lock);
476 goto register_sys_interface;
477 }
478 mutex_unlock(&thermal_list_lock);
479
480 hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
481 if (!hwmon)
482 return -ENOMEM;
483
484 INIT_LIST_HEAD(&hwmon->tz_list);
485 strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
486 hwmon->device = hwmon_device_register(NULL);
487 if (IS_ERR(hwmon->device)) {
488 result = PTR_ERR(hwmon->device);
489 goto free_mem;
490 }
491 dev_set_drvdata(hwmon->device, hwmon);
492 result = device_create_file(hwmon->device, &dev_attr_name);
493 if (result)
494 goto unregister_hwmon_device;
495
496 register_sys_interface:
497 tz->hwmon = hwmon;
498 hwmon->count++;
499
500 snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
501 "temp%d_input", hwmon->count);
502 tz->temp_input.attr.attr.name = tz->temp_input.name;
503 tz->temp_input.attr.attr.mode = 0444;
504 tz->temp_input.attr.show = temp_input_show;
505 result = device_create_file(hwmon->device, &tz->temp_input.attr);
506 if (result)
507 goto unregister_hwmon_device;
508
509 if (tz->ops->get_crit_temp) {
510 unsigned long temperature;
511 if (!tz->ops->get_crit_temp(tz, &temperature)) {
512 snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
513 "temp%d_crit", hwmon->count);
514 tz->temp_crit.attr.attr.name = tz->temp_crit.name;
515 tz->temp_crit.attr.attr.mode = 0444;
516 tz->temp_crit.attr.show = temp_crit_show;
517 result = device_create_file(hwmon->device,
518 &tz->temp_crit.attr);
519 if (result)
520 goto unregister_hwmon_device;
521 }
522 }
523
524 mutex_lock(&thermal_list_lock);
525 if (new_hwmon_device)
526 list_add_tail(&hwmon->node, &thermal_hwmon_list);
527 list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
528 mutex_unlock(&thermal_list_lock);
529
530 return 0;
531
532 unregister_hwmon_device:
533 device_remove_file(hwmon->device, &tz->temp_crit.attr);
534 device_remove_file(hwmon->device, &tz->temp_input.attr);
535 if (new_hwmon_device) {
536 device_remove_file(hwmon->device, &dev_attr_name);
537 hwmon_device_unregister(hwmon->device);
538 }
539 free_mem:
540 if (new_hwmon_device)
541 kfree(hwmon);
542
543 return result;
544 }
545
546 static void
547 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
548 {
549 struct thermal_hwmon_device *hwmon = tz->hwmon;
550
551 tz->hwmon = NULL;
552 device_remove_file(hwmon->device, &tz->temp_input.attr);
553 device_remove_file(hwmon->device, &tz->temp_crit.attr);
554
555 mutex_lock(&thermal_list_lock);
556 list_del(&tz->hwmon_node);
557 if (!list_empty(&hwmon->tz_list)) {
558 mutex_unlock(&thermal_list_lock);
559 return;
560 }
561 list_del(&hwmon->node);
562 mutex_unlock(&thermal_list_lock);
563
564 device_remove_file(hwmon->device, &dev_attr_name);
565 hwmon_device_unregister(hwmon->device);
566 kfree(hwmon);
567 }
568 #else
569 static int
570 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
571 {
572 return 0;
573 }
574
575 static void
576 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
577 {
578 }
579 #endif
580
581 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
582 int delay)
583 {
584 cancel_delayed_work(&(tz->poll_queue));
585
586 if (!delay)
587 return;
588
589 if (delay > 1000)
590 schedule_delayed_work(&(tz->poll_queue),
591 round_jiffies(msecs_to_jiffies(delay)));
592 else
593 schedule_delayed_work(&(tz->poll_queue),
594 msecs_to_jiffies(delay));
595 }
596
597 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
598 int temp, int trip_temp, int trip)
599 {
600 int trend = 0;
601 struct thermal_cooling_device_instance *instance;
602 struct thermal_cooling_device *cdev;
603 long state, max_state;
604
605 /*
606 * Above Trip?
607 * -----------
608 * Calculate the thermal trend (using the passive cooling equation)
609 * and modify the performance limit for all passive cooling devices
610 * accordingly. Note that we assume symmetry.
611 */
612 if (temp >= trip_temp) {
613 tz->passive = true;
614
615 trend = (tz->tc1 * (temp - tz->last_temperature)) +
616 (tz->tc2 * (temp - trip_temp));
617
618 /* Heating up? */
619 if (trend > 0) {
620 list_for_each_entry(instance, &tz->cooling_devices,
621 node) {
622 if (instance->trip != trip)
623 continue;
624 cdev = instance->cdev;
625 cdev->ops->get_cur_state(cdev, &state);
626 cdev->ops->get_max_state(cdev, &max_state);
627 if (state++ < max_state)
628 cdev->ops->set_cur_state(cdev, state);
629 }
630 } else if (trend < 0) { /* Cooling off? */
631 list_for_each_entry(instance, &tz->cooling_devices,
632 node) {
633 if (instance->trip != trip)
634 continue;
635 cdev = instance->cdev;
636 cdev->ops->get_cur_state(cdev, &state);
637 cdev->ops->get_max_state(cdev, &max_state);
638 if (state > 0)
639 cdev->ops->set_cur_state(cdev, --state);
640 }
641 }
642 return;
643 }
644
645 /*
646 * Below Trip?
647 * -----------
648 * Implement passive cooling hysteresis to slowly increase performance
649 * and avoid thrashing around the passive trip point. Note that we
650 * assume symmetry.
651 */
652 list_for_each_entry(instance, &tz->cooling_devices, node) {
653 if (instance->trip != trip)
654 continue;
655 cdev = instance->cdev;
656 cdev->ops->get_cur_state(cdev, &state);
657 cdev->ops->get_max_state(cdev, &max_state);
658 if (state > 0)
659 cdev->ops->set_cur_state(cdev, --state);
660 if (state == 0)
661 tz->passive = false;
662 }
663 }
664
665 static void thermal_zone_device_check(struct work_struct *work)
666 {
667 struct thermal_zone_device *tz = container_of(work, struct
668 thermal_zone_device,
669 poll_queue.work);
670 thermal_zone_device_update(tz);
671 }
672
673 /**
674 * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
675 * @tz: thermal zone device
676 * @trip: indicates which trip point the cooling devices is
677 * associated with in this thermal zone.
678 * @cdev: thermal cooling device
679 *
680 * This function is usually called in the thermal zone device .bind callback.
681 */
682 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
683 int trip,
684 struct thermal_cooling_device *cdev)
685 {
686 struct thermal_cooling_device_instance *dev;
687 struct thermal_cooling_device_instance *pos;
688 struct thermal_zone_device *pos1;
689 struct thermal_cooling_device *pos2;
690 int result;
691
692 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
693 return -EINVAL;
694
695 list_for_each_entry(pos1, &thermal_tz_list, node) {
696 if (pos1 == tz)
697 break;
698 }
699 list_for_each_entry(pos2, &thermal_cdev_list, node) {
700 if (pos2 == cdev)
701 break;
702 }
703
704 if (tz != pos1 || cdev != pos2)
705 return -EINVAL;
706
707 dev =
708 kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
709 if (!dev)
710 return -ENOMEM;
711 dev->tz = tz;
712 dev->cdev = cdev;
713 dev->trip = trip;
714 result = get_idr(&tz->idr, &tz->lock, &dev->id);
715 if (result)
716 goto free_mem;
717
718 sprintf(dev->name, "cdev%d", dev->id);
719 result =
720 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
721 if (result)
722 goto release_idr;
723
724 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
725 dev->attr.attr.name = dev->attr_name;
726 dev->attr.attr.mode = 0444;
727 dev->attr.show = thermal_cooling_device_trip_point_show;
728 result = device_create_file(&tz->device, &dev->attr);
729 if (result)
730 goto remove_symbol_link;
731
732 mutex_lock(&tz->lock);
733 list_for_each_entry(pos, &tz->cooling_devices, node)
734 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
735 result = -EEXIST;
736 break;
737 }
738 if (!result)
739 list_add_tail(&dev->node, &tz->cooling_devices);
740 mutex_unlock(&tz->lock);
741
742 if (!result)
743 return 0;
744
745 device_remove_file(&tz->device, &dev->attr);
746 remove_symbol_link:
747 sysfs_remove_link(&tz->device.kobj, dev->name);
748 release_idr:
749 release_idr(&tz->idr, &tz->lock, dev->id);
750 free_mem:
751 kfree(dev);
752 return result;
753 }
754
755 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
756
757 /**
758 * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
759 * @tz: thermal zone device
760 * @trip: indicates which trip point the cooling devices is
761 * associated with in this thermal zone.
762 * @cdev: thermal cooling device
763 *
764 * This function is usually called in the thermal zone device .unbind callback.
765 */
766 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
767 int trip,
768 struct thermal_cooling_device *cdev)
769 {
770 struct thermal_cooling_device_instance *pos, *next;
771
772 mutex_lock(&tz->lock);
773 list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
774 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
775 list_del(&pos->node);
776 mutex_unlock(&tz->lock);
777 goto unbind;
778 }
779 }
780 mutex_unlock(&tz->lock);
781
782 return -ENODEV;
783
784 unbind:
785 device_remove_file(&tz->device, &pos->attr);
786 sysfs_remove_link(&tz->device.kobj, pos->name);
787 release_idr(&tz->idr, &tz->lock, pos->id);
788 kfree(pos);
789 return 0;
790 }
791
792 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
793
794 static void thermal_release(struct device *dev)
795 {
796 struct thermal_zone_device *tz;
797 struct thermal_cooling_device *cdev;
798
799 if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
800 tz = to_thermal_zone(dev);
801 kfree(tz);
802 } else {
803 cdev = to_cooling_device(dev);
804 kfree(cdev);
805 }
806 }
807
808 static struct class thermal_class = {
809 .name = "thermal",
810 .dev_release = thermal_release,
811 };
812
813 /**
814 * thermal_cooling_device_register - register a new thermal cooling device
815 * @type: the thermal cooling device type.
816 * @devdata: device private data.
817 * @ops: standard thermal cooling devices callbacks.
818 */
819 struct thermal_cooling_device *thermal_cooling_device_register(char *type,
820 void *devdata,
821 struct
822 thermal_cooling_device_ops
823 *ops)
824 {
825 struct thermal_cooling_device *cdev;
826 struct thermal_zone_device *pos;
827 int result;
828
829 if (strlen(type) >= THERMAL_NAME_LENGTH)
830 return ERR_PTR(-EINVAL);
831
832 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
833 !ops->set_cur_state)
834 return ERR_PTR(-EINVAL);
835
836 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
837 if (!cdev)
838 return ERR_PTR(-ENOMEM);
839
840 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
841 if (result) {
842 kfree(cdev);
843 return ERR_PTR(result);
844 }
845
846 strcpy(cdev->type, type);
847 cdev->ops = ops;
848 cdev->device.class = &thermal_class;
849 cdev->devdata = devdata;
850 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
851 result = device_register(&cdev->device);
852 if (result) {
853 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
854 kfree(cdev);
855 return ERR_PTR(result);
856 }
857
858 /* sys I/F */
859 if (type) {
860 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
861 if (result)
862 goto unregister;
863 }
864
865 result = device_create_file(&cdev->device, &dev_attr_max_state);
866 if (result)
867 goto unregister;
868
869 result = device_create_file(&cdev->device, &dev_attr_cur_state);
870 if (result)
871 goto unregister;
872
873 mutex_lock(&thermal_list_lock);
874 list_add(&cdev->node, &thermal_cdev_list);
875 list_for_each_entry(pos, &thermal_tz_list, node) {
876 if (!pos->ops->bind)
877 continue;
878 result = pos->ops->bind(pos, cdev);
879 if (result)
880 break;
881
882 }
883 mutex_unlock(&thermal_list_lock);
884
885 if (!result)
886 return cdev;
887
888 unregister:
889 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
890 device_unregister(&cdev->device);
891 return ERR_PTR(result);
892 }
893
894 EXPORT_SYMBOL(thermal_cooling_device_register);
895
896 /**
897 * thermal_cooling_device_unregister - removes the registered thermal cooling device
898 * @cdev: the thermal cooling device to remove.
899 *
900 * thermal_cooling_device_unregister() must be called when the device is no
901 * longer needed.
902 */
903 void thermal_cooling_device_unregister(struct
904 thermal_cooling_device
905 *cdev)
906 {
907 struct thermal_zone_device *tz;
908 struct thermal_cooling_device *pos = NULL;
909
910 if (!cdev)
911 return;
912
913 mutex_lock(&thermal_list_lock);
914 list_for_each_entry(pos, &thermal_cdev_list, node)
915 if (pos == cdev)
916 break;
917 if (pos != cdev) {
918 /* thermal cooling device not found */
919 mutex_unlock(&thermal_list_lock);
920 return;
921 }
922 list_del(&cdev->node);
923 list_for_each_entry(tz, &thermal_tz_list, node) {
924 if (!tz->ops->unbind)
925 continue;
926 tz->ops->unbind(tz, cdev);
927 }
928 mutex_unlock(&thermal_list_lock);
929 if (cdev->type[0])
930 device_remove_file(&cdev->device, &dev_attr_cdev_type);
931 device_remove_file(&cdev->device, &dev_attr_max_state);
932 device_remove_file(&cdev->device, &dev_attr_cur_state);
933
934 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
935 device_unregister(&cdev->device);
936 return;
937 }
938
939 EXPORT_SYMBOL(thermal_cooling_device_unregister);
940
941 /**
942 * thermal_zone_device_update - force an update of a thermal zone's state
943 * @ttz: the thermal zone to update
944 */
945
946 void thermal_zone_device_update(struct thermal_zone_device *tz)
947 {
948 int count, ret = 0;
949 long temp, trip_temp;
950 enum thermal_trip_type trip_type;
951 struct thermal_cooling_device_instance *instance;
952 struct thermal_cooling_device *cdev;
953
954 mutex_lock(&tz->lock);
955
956 if (tz->ops->get_temp(tz, &temp)) {
957 /* get_temp failed - retry it later */
958 printk(KERN_WARNING PREFIX "failed to read out thermal zone "
959 "%d\n", tz->id);
960 goto leave;
961 }
962
963 for (count = 0; count < tz->trips; count++) {
964 tz->ops->get_trip_type(tz, count, &trip_type);
965 tz->ops->get_trip_temp(tz, count, &trip_temp);
966
967 switch (trip_type) {
968 case THERMAL_TRIP_CRITICAL:
969 if (temp >= trip_temp) {
970 if (tz->ops->notify)
971 ret = tz->ops->notify(tz, count,
972 trip_type);
973 if (!ret) {
974 printk(KERN_EMERG
975 "Critical temperature reached (%ld C), shutting down.\n",
976 temp/1000);
977 orderly_poweroff(true);
978 }
979 }
980 break;
981 case THERMAL_TRIP_HOT:
982 if (temp >= trip_temp)
983 if (tz->ops->notify)
984 tz->ops->notify(tz, count, trip_type);
985 break;
986 case THERMAL_TRIP_ACTIVE:
987 list_for_each_entry(instance, &tz->cooling_devices,
988 node) {
989 if (instance->trip != count)
990 continue;
991
992 cdev = instance->cdev;
993
994 if (temp >= trip_temp)
995 cdev->ops->set_cur_state(cdev, 1);
996 else
997 cdev->ops->set_cur_state(cdev, 0);
998 }
999 break;
1000 case THERMAL_TRIP_PASSIVE:
1001 if (temp >= trip_temp || tz->passive)
1002 thermal_zone_device_passive(tz, temp,
1003 trip_temp, count);
1004 break;
1005 }
1006 }
1007
1008 if (tz->forced_passive)
1009 thermal_zone_device_passive(tz, temp, tz->forced_passive,
1010 THERMAL_TRIPS_NONE);
1011
1012 tz->last_temperature = temp;
1013
1014 leave:
1015 if (tz->passive)
1016 thermal_zone_device_set_polling(tz, tz->passive_delay);
1017 else if (tz->polling_delay)
1018 thermal_zone_device_set_polling(tz, tz->polling_delay);
1019 mutex_unlock(&tz->lock);
1020 }
1021 EXPORT_SYMBOL(thermal_zone_device_update);
1022
1023 /**
1024 * thermal_zone_device_register - register a new thermal zone device
1025 * @type: the thermal zone device type
1026 * @trips: the number of trip points the thermal zone support
1027 * @devdata: private device data
1028 * @ops: standard thermal zone device callbacks
1029 * @tc1: thermal coefficient 1 for passive calculations
1030 * @tc2: thermal coefficient 2 for passive calculations
1031 * @passive_delay: number of milliseconds to wait between polls when
1032 * performing passive cooling
1033 * @polling_delay: number of milliseconds to wait between polls when checking
1034 * whether trip points have been crossed (0 for interrupt
1035 * driven systems)
1036 *
1037 * thermal_zone_device_unregister() must be called when the device is no
1038 * longer needed. The passive cooling formula uses tc1 and tc2 as described in
1039 * section 11.1.5.1 of the ACPI specification 3.0.
1040 */
1041 struct thermal_zone_device *thermal_zone_device_register(char *type,
1042 int trips,
1043 void *devdata, struct
1044 thermal_zone_device_ops
1045 *ops, int tc1, int
1046 tc2,
1047 int passive_delay,
1048 int polling_delay)
1049 {
1050 struct thermal_zone_device *tz;
1051 struct thermal_cooling_device *pos;
1052 enum thermal_trip_type trip_type;
1053 int result;
1054 int count;
1055 int passive = 0;
1056
1057 if (strlen(type) >= THERMAL_NAME_LENGTH)
1058 return ERR_PTR(-EINVAL);
1059
1060 if (trips > THERMAL_MAX_TRIPS || trips < 0)
1061 return ERR_PTR(-EINVAL);
1062
1063 if (!ops || !ops->get_temp)
1064 return ERR_PTR(-EINVAL);
1065
1066 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1067 if (!tz)
1068 return ERR_PTR(-ENOMEM);
1069
1070 INIT_LIST_HEAD(&tz->cooling_devices);
1071 idr_init(&tz->idr);
1072 mutex_init(&tz->lock);
1073 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1074 if (result) {
1075 kfree(tz);
1076 return ERR_PTR(result);
1077 }
1078
1079 strcpy(tz->type, type);
1080 tz->ops = ops;
1081 tz->device.class = &thermal_class;
1082 tz->devdata = devdata;
1083 tz->trips = trips;
1084 tz->tc1 = tc1;
1085 tz->tc2 = tc2;
1086 tz->passive_delay = passive_delay;
1087 tz->polling_delay = polling_delay;
1088
1089 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1090 result = device_register(&tz->device);
1091 if (result) {
1092 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1093 kfree(tz);
1094 return ERR_PTR(result);
1095 }
1096
1097 /* sys I/F */
1098 if (type) {
1099 result = device_create_file(&tz->device, &dev_attr_type);
1100 if (result)
1101 goto unregister;
1102 }
1103
1104 result = device_create_file(&tz->device, &dev_attr_temp);
1105 if (result)
1106 goto unregister;
1107
1108 if (ops->get_mode) {
1109 result = device_create_file(&tz->device, &dev_attr_mode);
1110 if (result)
1111 goto unregister;
1112 }
1113
1114 for (count = 0; count < trips; count++) {
1115 TRIP_POINT_ATTR_ADD(&tz->device, count, result);
1116 if (result)
1117 goto unregister;
1118 tz->ops->get_trip_type(tz, count, &trip_type);
1119 if (trip_type == THERMAL_TRIP_PASSIVE)
1120 passive = 1;
1121 }
1122
1123 if (!passive)
1124 result = device_create_file(&tz->device,
1125 &dev_attr_passive);
1126
1127 if (result)
1128 goto unregister;
1129
1130 result = thermal_add_hwmon_sysfs(tz);
1131 if (result)
1132 goto unregister;
1133
1134 mutex_lock(&thermal_list_lock);
1135 list_add_tail(&tz->node, &thermal_tz_list);
1136 if (ops->bind)
1137 list_for_each_entry(pos, &thermal_cdev_list, node) {
1138 result = ops->bind(tz, pos);
1139 if (result)
1140 break;
1141 }
1142 mutex_unlock(&thermal_list_lock);
1143
1144 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1145
1146 thermal_zone_device_update(tz);
1147
1148 if (!result)
1149 return tz;
1150
1151 unregister:
1152 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1153 device_unregister(&tz->device);
1154 return ERR_PTR(result);
1155 }
1156
1157 EXPORT_SYMBOL(thermal_zone_device_register);
1158
1159 /**
1160 * thermal_device_unregister - removes the registered thermal zone device
1161 * @tz: the thermal zone device to remove
1162 */
1163 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1164 {
1165 struct thermal_cooling_device *cdev;
1166 struct thermal_zone_device *pos = NULL;
1167 int count;
1168
1169 if (!tz)
1170 return;
1171
1172 mutex_lock(&thermal_list_lock);
1173 list_for_each_entry(pos, &thermal_tz_list, node)
1174 if (pos == tz)
1175 break;
1176 if (pos != tz) {
1177 /* thermal zone device not found */
1178 mutex_unlock(&thermal_list_lock);
1179 return;
1180 }
1181 list_del(&tz->node);
1182 if (tz->ops->unbind)
1183 list_for_each_entry(cdev, &thermal_cdev_list, node)
1184 tz->ops->unbind(tz, cdev);
1185 mutex_unlock(&thermal_list_lock);
1186
1187 thermal_zone_device_set_polling(tz, 0);
1188
1189 if (tz->type[0])
1190 device_remove_file(&tz->device, &dev_attr_type);
1191 device_remove_file(&tz->device, &dev_attr_temp);
1192 if (tz->ops->get_mode)
1193 device_remove_file(&tz->device, &dev_attr_mode);
1194
1195 for (count = 0; count < tz->trips; count++)
1196 TRIP_POINT_ATTR_REMOVE(&tz->device, count);
1197
1198 thermal_remove_hwmon_sysfs(tz);
1199 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1200 idr_destroy(&tz->idr);
1201 mutex_destroy(&tz->lock);
1202 device_unregister(&tz->device);
1203 return;
1204 }
1205
1206 EXPORT_SYMBOL(thermal_zone_device_unregister);
1207
1208 static int __init thermal_init(void)
1209 {
1210 int result = 0;
1211
1212 result = class_register(&thermal_class);
1213 if (result) {
1214 idr_destroy(&thermal_tz_idr);
1215 idr_destroy(&thermal_cdev_idr);
1216 mutex_destroy(&thermal_idr_lock);
1217 mutex_destroy(&thermal_list_lock);
1218 }
1219 return result;
1220 }
1221
1222 static void __exit thermal_exit(void)
1223 {
1224 class_unregister(&thermal_class);
1225 idr_destroy(&thermal_tz_idr);
1226 idr_destroy(&thermal_cdev_idr);
1227 mutex_destroy(&thermal_idr_lock);
1228 mutex_destroy(&thermal_list_lock);
1229 }
1230
1231 subsys_initcall(thermal_init);
1232 module_exit(thermal_exit);
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