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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * thermal.c - sysfs interface of thermal devices
4 *
5 * Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
6 *
7 * Highly based on original thermal_core.c
8 * Copyright (C) 2008 Intel Corp
9 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
10 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/sysfs.h>
16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20#include <linux/jiffies.h>
21
22#include "thermal_core.h"
23
24/* sys I/F for thermal zone */
25
26static ssize_t
27type_show(struct device *dev, struct device_attribute *attr, char *buf)
28{
29 struct thermal_zone_device *tz = to_thermal_zone(dev);
30
31 return sprintf(buf, "%s\n", tz->type);
32}
33
34static ssize_t
35temp_show(struct device *dev, struct device_attribute *attr, char *buf)
36{
37 struct thermal_zone_device *tz = to_thermal_zone(dev);
38 int temperature, ret;
39
40 ret = thermal_zone_get_temp(tz, &temperature);
41
42 if (ret)
43 return ret;
44
45 return sprintf(buf, "%d\n", temperature);
46}
47
48static ssize_t
49mode_show(struct device *dev, struct device_attribute *attr, char *buf)
50{
51 struct thermal_zone_device *tz = to_thermal_zone(dev);
52 int enabled = thermal_zone_device_is_enabled(tz);
53
54 return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled");
55}
56
57static ssize_t
58mode_store(struct device *dev, struct device_attribute *attr,
59 const char *buf, size_t count)
60{
61 struct thermal_zone_device *tz = to_thermal_zone(dev);
62 int result;
63
64 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
65 result = thermal_zone_device_enable(tz);
66 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
67 result = thermal_zone_device_disable(tz);
68 else
69 result = -EINVAL;
70
71 if (result)
72 return result;
73
74 return count;
75}
76
77static ssize_t
78trip_point_type_show(struct device *dev, struct device_attribute *attr,
79 char *buf)
80{
81 struct thermal_zone_device *tz = to_thermal_zone(dev);
82 enum thermal_trip_type type;
83 int trip, result;
84
85 if (!tz->ops->get_trip_type)
86 return -EPERM;
87
88 if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
89 return -EINVAL;
90
91 result = tz->ops->get_trip_type(tz, trip, &type);
92 if (result)
93 return result;
94
95 switch (type) {
96 case THERMAL_TRIP_CRITICAL:
97 return sprintf(buf, "critical\n");
98 case THERMAL_TRIP_HOT:
99 return sprintf(buf, "hot\n");
100 case THERMAL_TRIP_PASSIVE:
101 return sprintf(buf, "passive\n");
102 case THERMAL_TRIP_ACTIVE:
103 return sprintf(buf, "active\n");
104 default:
105 return sprintf(buf, "unknown\n");
106 }
107}
108
109static ssize_t
110trip_point_temp_store(struct device *dev, struct device_attribute *attr,
111 const char *buf, size_t count)
112{
113 struct thermal_zone_device *tz = to_thermal_zone(dev);
114 int trip, ret;
115 int temperature, hyst = 0;
116 enum thermal_trip_type type;
117
118 if (!tz->ops->set_trip_temp)
119 return -EPERM;
120
121 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
122 return -EINVAL;
123
124 if (kstrtoint(buf, 10, &temperature))
125 return -EINVAL;
126
127 ret = tz->ops->set_trip_temp(tz, trip, temperature);
128 if (ret)
129 return ret;
130
131 if (tz->ops->get_trip_hyst) {
132 ret = tz->ops->get_trip_hyst(tz, trip, &hyst);
133 if (ret)
134 return ret;
135 }
136
137 ret = tz->ops->get_trip_type(tz, trip, &type);
138 if (ret)
139 return ret;
140
141 thermal_notify_tz_trip_change(tz->id, trip, type, temperature, hyst);
142
143 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
144
145 return count;
146}
147
148static ssize_t
149trip_point_temp_show(struct device *dev, struct device_attribute *attr,
150 char *buf)
151{
152 struct thermal_zone_device *tz = to_thermal_zone(dev);
153 int trip, ret;
154 int temperature;
155
156 if (!tz->ops->get_trip_temp)
157 return -EPERM;
158
159 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
160 return -EINVAL;
161
162 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
163
164 if (ret)
165 return ret;
166
167 return sprintf(buf, "%d\n", temperature);
168}
169
170static ssize_t
171trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
172 const char *buf, size_t count)
173{
174 struct thermal_zone_device *tz = to_thermal_zone(dev);
175 int trip, ret;
176 int temperature;
177
178 if (!tz->ops->set_trip_hyst)
179 return -EPERM;
180
181 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
182 return -EINVAL;
183
184 if (kstrtoint(buf, 10, &temperature))
185 return -EINVAL;
186
187 /*
188 * We are not doing any check on the 'temperature' value
189 * here. The driver implementing 'set_trip_hyst' has to
190 * take care of this.
191 */
192 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
193
194 if (!ret)
195 thermal_zone_set_trips(tz);
196
197 return ret ? ret : count;
198}
199
200static ssize_t
201trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
202 char *buf)
203{
204 struct thermal_zone_device *tz = to_thermal_zone(dev);
205 int trip, ret;
206 int temperature;
207
208 if (!tz->ops->get_trip_hyst)
209 return -EPERM;
210
211 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
212 return -EINVAL;
213
214 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
215
216 return ret ? ret : sprintf(buf, "%d\n", temperature);
217}
218
219static ssize_t
220passive_store(struct device *dev, struct device_attribute *attr,
221 const char *buf, size_t count)
222{
223 struct thermal_zone_device *tz = to_thermal_zone(dev);
224 int state;
225
226 if (sscanf(buf, "%d\n", &state) != 1)
227 return -EINVAL;
228
229 /* sanity check: values below 1000 millicelcius don't make sense
230 * and can cause the system to go into a thermal heart attack
231 */
232 if (state && state < 1000)
233 return -EINVAL;
234
235 if (state && !tz->forced_passive) {
236 if (!tz->passive_delay)
237 tz->passive_delay = 1000;
238 thermal_zone_device_rebind_exception(tz, "Processor",
239 sizeof("Processor"));
240 } else if (!state && tz->forced_passive) {
241 tz->passive_delay = 0;
242 thermal_zone_device_unbind_exception(tz, "Processor",
243 sizeof("Processor"));
244 }
245
246 tz->forced_passive = state;
247
248 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
249
250 return count;
251}
252
253static ssize_t
254passive_show(struct device *dev, struct device_attribute *attr,
255 char *buf)
256{
257 struct thermal_zone_device *tz = to_thermal_zone(dev);
258
259 return sprintf(buf, "%d\n", tz->forced_passive);
260}
261
262static ssize_t
263policy_store(struct device *dev, struct device_attribute *attr,
264 const char *buf, size_t count)
265{
266 struct thermal_zone_device *tz = to_thermal_zone(dev);
267 char name[THERMAL_NAME_LENGTH];
268 int ret;
269
270 snprintf(name, sizeof(name), "%s", buf);
271
272 ret = thermal_zone_device_set_policy(tz, name);
273 if (!ret)
274 ret = count;
275
276 return ret;
277}
278
279static ssize_t
280policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
281{
282 struct thermal_zone_device *tz = to_thermal_zone(dev);
283
284 return sprintf(buf, "%s\n", tz->governor->name);
285}
286
287static ssize_t
288available_policies_show(struct device *dev, struct device_attribute *devattr,
289 char *buf)
290{
291 return thermal_build_list_of_policies(buf);
292}
293
294#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
295static ssize_t
296emul_temp_store(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298{
299 struct thermal_zone_device *tz = to_thermal_zone(dev);
300 int ret = 0;
301 int temperature;
302
303 if (kstrtoint(buf, 10, &temperature))
304 return -EINVAL;
305
306 if (!tz->ops->set_emul_temp) {
307 mutex_lock(&tz->lock);
308 tz->emul_temperature = temperature;
309 mutex_unlock(&tz->lock);
310 } else {
311 ret = tz->ops->set_emul_temp(tz, temperature);
312 }
313
314 if (!ret)
315 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
316
317 return ret ? ret : count;
318}
319static DEVICE_ATTR_WO(emul_temp);
320#endif
321
322static ssize_t
323sustainable_power_show(struct device *dev, struct device_attribute *devattr,
324 char *buf)
325{
326 struct thermal_zone_device *tz = to_thermal_zone(dev);
327
328 if (tz->tzp)
329 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
330 else
331 return -EIO;
332}
333
334static ssize_t
335sustainable_power_store(struct device *dev, struct device_attribute *devattr,
336 const char *buf, size_t count)
337{
338 struct thermal_zone_device *tz = to_thermal_zone(dev);
339 u32 sustainable_power;
340
341 if (!tz->tzp)
342 return -EIO;
343
344 if (kstrtou32(buf, 10, &sustainable_power))
345 return -EINVAL;
346
347 tz->tzp->sustainable_power = sustainable_power;
348
349 return count;
350}
351
352#define create_s32_tzp_attr(name) \
353 static ssize_t \
354 name##_show(struct device *dev, struct device_attribute *devattr, \
355 char *buf) \
356 { \
357 struct thermal_zone_device *tz = to_thermal_zone(dev); \
358 \
359 if (tz->tzp) \
360 return sprintf(buf, "%d\n", tz->tzp->name); \
361 else \
362 return -EIO; \
363 } \
364 \
365 static ssize_t \
366 name##_store(struct device *dev, struct device_attribute *devattr, \
367 const char *buf, size_t count) \
368 { \
369 struct thermal_zone_device *tz = to_thermal_zone(dev); \
370 s32 value; \
371 \
372 if (!tz->tzp) \
373 return -EIO; \
374 \
375 if (kstrtos32(buf, 10, &value)) \
376 return -EINVAL; \
377 \
378 tz->tzp->name = value; \
379 \
380 return count; \
381 } \
382 static DEVICE_ATTR_RW(name)
383
384create_s32_tzp_attr(k_po);
385create_s32_tzp_attr(k_pu);
386create_s32_tzp_attr(k_i);
387create_s32_tzp_attr(k_d);
388create_s32_tzp_attr(integral_cutoff);
389create_s32_tzp_attr(slope);
390create_s32_tzp_attr(offset);
391#undef create_s32_tzp_attr
392
393/*
394 * These are thermal zone device attributes that will always be present.
395 * All the attributes created for tzp (create_s32_tzp_attr) also are always
396 * present on the sysfs interface.
397 */
398static DEVICE_ATTR_RO(type);
399static DEVICE_ATTR_RO(temp);
400static DEVICE_ATTR_RW(policy);
401static DEVICE_ATTR_RO(available_policies);
402static DEVICE_ATTR_RW(sustainable_power);
403
404/* These thermal zone device attributes are created based on conditions */
405static DEVICE_ATTR_RW(mode);
406static DEVICE_ATTR_RW(passive);
407
408/* These attributes are unconditionally added to a thermal zone */
409static struct attribute *thermal_zone_dev_attrs[] = {
410 &dev_attr_type.attr,
411 &dev_attr_temp.attr,
412#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
413 &dev_attr_emul_temp.attr,
414#endif
415 &dev_attr_policy.attr,
416 &dev_attr_available_policies.attr,
417 &dev_attr_sustainable_power.attr,
418 &dev_attr_k_po.attr,
419 &dev_attr_k_pu.attr,
420 &dev_attr_k_i.attr,
421 &dev_attr_k_d.attr,
422 &dev_attr_integral_cutoff.attr,
423 &dev_attr_slope.attr,
424 &dev_attr_offset.attr,
425 NULL,
426};
427
428static struct attribute_group thermal_zone_attribute_group = {
429 .attrs = thermal_zone_dev_attrs,
430};
431
432static struct attribute *thermal_zone_mode_attrs[] = {
433 &dev_attr_mode.attr,
434 NULL,
435};
436
437static struct attribute_group thermal_zone_mode_attribute_group = {
438 .attrs = thermal_zone_mode_attrs,
439};
440
441/* We expose passive only if passive trips are present */
442static struct attribute *thermal_zone_passive_attrs[] = {
443 &dev_attr_passive.attr,
444 NULL,
445};
446
447static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
448 struct attribute *attr,
449 int attrno)
450{
451 struct device *dev = container_of(kobj, struct device, kobj);
452 struct thermal_zone_device *tz;
453 enum thermal_trip_type trip_type;
454 int count, passive = 0;
455
456 tz = container_of(dev, struct thermal_zone_device, device);
457
458 for (count = 0; count < tz->trips && !passive; count++) {
459 tz->ops->get_trip_type(tz, count, &trip_type);
460
461 if (trip_type == THERMAL_TRIP_PASSIVE)
462 passive = 1;
463 }
464
465 if (!passive)
466 return attr->mode;
467
468 return 0;
469}
470
471static struct attribute_group thermal_zone_passive_attribute_group = {
472 .attrs = thermal_zone_passive_attrs,
473 .is_visible = thermal_zone_passive_is_visible,
474};
475
476static const struct attribute_group *thermal_zone_attribute_groups[] = {
477 &thermal_zone_attribute_group,
478 &thermal_zone_mode_attribute_group,
479 &thermal_zone_passive_attribute_group,
480 /* This is not NULL terminated as we create the group dynamically */
481};
482
483/**
484 * create_trip_attrs() - create attributes for trip points
485 * @tz: the thermal zone device
486 * @mask: Writeable trip point bitmap.
487 *
488 * helper function to instantiate sysfs entries for every trip
489 * point and its properties of a struct thermal_zone_device.
490 *
491 * Return: 0 on success, the proper error value otherwise.
492 */
493static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
494{
495 struct attribute **attrs;
496 int indx;
497
498 /* This function works only for zones with at least one trip */
499 if (tz->trips <= 0)
500 return -EINVAL;
501
502 tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
503 GFP_KERNEL);
504 if (!tz->trip_type_attrs)
505 return -ENOMEM;
506
507 tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
508 GFP_KERNEL);
509 if (!tz->trip_temp_attrs) {
510 kfree(tz->trip_type_attrs);
511 return -ENOMEM;
512 }
513
514 if (tz->ops->get_trip_hyst) {
515 tz->trip_hyst_attrs = kcalloc(tz->trips,
516 sizeof(*tz->trip_hyst_attrs),
517 GFP_KERNEL);
518 if (!tz->trip_hyst_attrs) {
519 kfree(tz->trip_type_attrs);
520 kfree(tz->trip_temp_attrs);
521 return -ENOMEM;
522 }
523 }
524
525 attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
526 if (!attrs) {
527 kfree(tz->trip_type_attrs);
528 kfree(tz->trip_temp_attrs);
529 if (tz->ops->get_trip_hyst)
530 kfree(tz->trip_hyst_attrs);
531 return -ENOMEM;
532 }
533
534 for (indx = 0; indx < tz->trips; indx++) {
535 /* create trip type attribute */
536 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
537 "trip_point_%d_type", indx);
538
539 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
540 tz->trip_type_attrs[indx].attr.attr.name =
541 tz->trip_type_attrs[indx].name;
542 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
543 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
544 attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
545
546 /* create trip temp attribute */
547 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
548 "trip_point_%d_temp", indx);
549
550 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
551 tz->trip_temp_attrs[indx].attr.attr.name =
552 tz->trip_temp_attrs[indx].name;
553 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
554 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
555 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
556 mask & (1 << indx)) {
557 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
558 tz->trip_temp_attrs[indx].attr.store =
559 trip_point_temp_store;
560 }
561 attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
562
563 /* create Optional trip hyst attribute */
564 if (!tz->ops->get_trip_hyst)
565 continue;
566 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
567 "trip_point_%d_hyst", indx);
568
569 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
570 tz->trip_hyst_attrs[indx].attr.attr.name =
571 tz->trip_hyst_attrs[indx].name;
572 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
573 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
574 if (tz->ops->set_trip_hyst) {
575 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
576 tz->trip_hyst_attrs[indx].attr.store =
577 trip_point_hyst_store;
578 }
579 attrs[indx + tz->trips * 2] =
580 &tz->trip_hyst_attrs[indx].attr.attr;
581 }
582 attrs[tz->trips * 3] = NULL;
583
584 tz->trips_attribute_group.attrs = attrs;
585
586 return 0;
587}
588
589/**
590 * destroy_trip_attrs() - destroy attributes for trip points
591 * @tz: the thermal zone device
592 *
593 * helper function to free resources allocated by create_trip_attrs()
594 */
595static void destroy_trip_attrs(struct thermal_zone_device *tz)
596{
597 if (!tz)
598 return;
599
600 kfree(tz->trip_type_attrs);
601 kfree(tz->trip_temp_attrs);
602 if (tz->ops->get_trip_hyst)
603 kfree(tz->trip_hyst_attrs);
604 kfree(tz->trips_attribute_group.attrs);
605}
606
607int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
608 int mask)
609{
610 const struct attribute_group **groups;
611 int i, size, result;
612
613 /* we need one extra for trips and the NULL to terminate the array */
614 size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
615 /* This also takes care of API requirement to be NULL terminated */
616 groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
617 if (!groups)
618 return -ENOMEM;
619
620 for (i = 0; i < size - 2; i++)
621 groups[i] = thermal_zone_attribute_groups[i];
622
623 if (tz->trips) {
624 result = create_trip_attrs(tz, mask);
625 if (result) {
626 kfree(groups);
627
628 return result;
629 }
630
631 groups[size - 2] = &tz->trips_attribute_group;
632 }
633
634 tz->device.groups = groups;
635
636 return 0;
637}
638
639void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
640{
641 if (!tz)
642 return;
643
644 if (tz->trips)
645 destroy_trip_attrs(tz);
646
647 kfree(tz->device.groups);
648}
649
650/* sys I/F for cooling device */
651static ssize_t
652cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
653{
654 struct thermal_cooling_device *cdev = to_cooling_device(dev);
655
656 return sprintf(buf, "%s\n", cdev->type);
657}
658
659static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
660 char *buf)
661{
662 struct thermal_cooling_device *cdev = to_cooling_device(dev);
663 unsigned long state;
664 int ret;
665
666 ret = cdev->ops->get_max_state(cdev, &state);
667 if (ret)
668 return ret;
669 return sprintf(buf, "%ld\n", state);
670}
671
672static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
673 char *buf)
674{
675 struct thermal_cooling_device *cdev = to_cooling_device(dev);
676 unsigned long state;
677 int ret;
678
679 ret = cdev->ops->get_cur_state(cdev, &state);
680 if (ret)
681 return ret;
682 return sprintf(buf, "%ld\n", state);
683}
684
685static ssize_t
686cur_state_store(struct device *dev, struct device_attribute *attr,
687 const char *buf, size_t count)
688{
689 struct thermal_cooling_device *cdev = to_cooling_device(dev);
690 unsigned long state;
691 int result;
692
693 if (sscanf(buf, "%ld\n", &state) != 1)
694 return -EINVAL;
695
696 if ((long)state < 0)
697 return -EINVAL;
698
699 mutex_lock(&cdev->lock);
700
701 result = cdev->ops->set_cur_state(cdev, state);
702 if (!result)
703 thermal_cooling_device_stats_update(cdev, state);
704
705 mutex_unlock(&cdev->lock);
706 return result ? result : count;
707}
708
709static struct device_attribute
710dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
711static DEVICE_ATTR_RO(max_state);
712static DEVICE_ATTR_RW(cur_state);
713
714static struct attribute *cooling_device_attrs[] = {
715 &dev_attr_cdev_type.attr,
716 &dev_attr_max_state.attr,
717 &dev_attr_cur_state.attr,
718 NULL,
719};
720
721static const struct attribute_group cooling_device_attr_group = {
722 .attrs = cooling_device_attrs,
723};
724
725static const struct attribute_group *cooling_device_attr_groups[] = {
726 &cooling_device_attr_group,
727 NULL, /* Space allocated for cooling_device_stats_attr_group */
728 NULL,
729};
730
731#ifdef CONFIG_THERMAL_STATISTICS
732struct cooling_dev_stats {
733 spinlock_t lock;
734 unsigned int total_trans;
735 unsigned long state;
736 unsigned long max_states;
737 ktime_t last_time;
738 ktime_t *time_in_state;
739 unsigned int *trans_table;
740};
741
742static void update_time_in_state(struct cooling_dev_stats *stats)
743{
744 ktime_t now = ktime_get(), delta;
745
746 delta = ktime_sub(now, stats->last_time);
747 stats->time_in_state[stats->state] =
748 ktime_add(stats->time_in_state[stats->state], delta);
749 stats->last_time = now;
750}
751
752void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
753 unsigned long new_state)
754{
755 struct cooling_dev_stats *stats = cdev->stats;
756
757 spin_lock(&stats->lock);
758
759 if (stats->state == new_state)
760 goto unlock;
761
762 update_time_in_state(stats);
763 stats->trans_table[stats->state * stats->max_states + new_state]++;
764 stats->state = new_state;
765 stats->total_trans++;
766
767unlock:
768 spin_unlock(&stats->lock);
769}
770
771static ssize_t total_trans_show(struct device *dev,
772 struct device_attribute *attr, char *buf)
773{
774 struct thermal_cooling_device *cdev = to_cooling_device(dev);
775 struct cooling_dev_stats *stats = cdev->stats;
776 int ret;
777
778 spin_lock(&stats->lock);
779 ret = sprintf(buf, "%u\n", stats->total_trans);
780 spin_unlock(&stats->lock);
781
782 return ret;
783}
784
785static ssize_t
786time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
787 char *buf)
788{
789 struct thermal_cooling_device *cdev = to_cooling_device(dev);
790 struct cooling_dev_stats *stats = cdev->stats;
791 ssize_t len = 0;
792 int i;
793
794 spin_lock(&stats->lock);
795 update_time_in_state(stats);
796
797 for (i = 0; i < stats->max_states; i++) {
798 len += sprintf(buf + len, "state%u\t%llu\n", i,
799 ktime_to_ms(stats->time_in_state[i]));
800 }
801 spin_unlock(&stats->lock);
802
803 return len;
804}
805
806static ssize_t
807reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
808 size_t count)
809{
810 struct thermal_cooling_device *cdev = to_cooling_device(dev);
811 struct cooling_dev_stats *stats = cdev->stats;
812 int i, states = stats->max_states;
813
814 spin_lock(&stats->lock);
815
816 stats->total_trans = 0;
817 stats->last_time = ktime_get();
818 memset(stats->trans_table, 0,
819 states * states * sizeof(*stats->trans_table));
820
821 for (i = 0; i < stats->max_states; i++)
822 stats->time_in_state[i] = ktime_set(0, 0);
823
824 spin_unlock(&stats->lock);
825
826 return count;
827}
828
829static ssize_t trans_table_show(struct device *dev,
830 struct device_attribute *attr, char *buf)
831{
832 struct thermal_cooling_device *cdev = to_cooling_device(dev);
833 struct cooling_dev_stats *stats = cdev->stats;
834 ssize_t len = 0;
835 int i, j;
836
837 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
838 len += snprintf(buf + len, PAGE_SIZE - len, " : ");
839 for (i = 0; i < stats->max_states; i++) {
840 if (len >= PAGE_SIZE)
841 break;
842 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
843 }
844 if (len >= PAGE_SIZE)
845 return PAGE_SIZE;
846
847 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
848
849 for (i = 0; i < stats->max_states; i++) {
850 if (len >= PAGE_SIZE)
851 break;
852
853 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
854
855 for (j = 0; j < stats->max_states; j++) {
856 if (len >= PAGE_SIZE)
857 break;
858 len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
859 stats->trans_table[i * stats->max_states + j]);
860 }
861 if (len >= PAGE_SIZE)
862 break;
863 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
864 }
865
866 if (len >= PAGE_SIZE) {
867 pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
868 return -EFBIG;
869 }
870 return len;
871}
872
873static DEVICE_ATTR_RO(total_trans);
874static DEVICE_ATTR_RO(time_in_state_ms);
875static DEVICE_ATTR_WO(reset);
876static DEVICE_ATTR_RO(trans_table);
877
878static struct attribute *cooling_device_stats_attrs[] = {
879 &dev_attr_total_trans.attr,
880 &dev_attr_time_in_state_ms.attr,
881 &dev_attr_reset.attr,
882 &dev_attr_trans_table.attr,
883 NULL
884};
885
886static const struct attribute_group cooling_device_stats_attr_group = {
887 .attrs = cooling_device_stats_attrs,
888 .name = "stats"
889};
890
891static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
892{
893 struct cooling_dev_stats *stats;
894 unsigned long states;
895 int var;
896
897 if (cdev->ops->get_max_state(cdev, &states))
898 return;
899
900 states++; /* Total number of states is highest state + 1 */
901
902 var = sizeof(*stats);
903 var += sizeof(*stats->time_in_state) * states;
904 var += sizeof(*stats->trans_table) * states * states;
905
906 stats = kzalloc(var, GFP_KERNEL);
907 if (!stats)
908 return;
909
910 stats->time_in_state = (ktime_t *)(stats + 1);
911 stats->trans_table = (unsigned int *)(stats->time_in_state + states);
912 cdev->stats = stats;
913 stats->last_time = ktime_get();
914 stats->max_states = states;
915
916 spin_lock_init(&stats->lock);
917
918 /* Fill the empty slot left in cooling_device_attr_groups */
919 var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
920 cooling_device_attr_groups[var] = &cooling_device_stats_attr_group;
921}
922
923static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
924{
925 kfree(cdev->stats);
926 cdev->stats = NULL;
927}
928
929#else
930
931static inline void
932cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
933static inline void
934cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
935
936#endif /* CONFIG_THERMAL_STATISTICS */
937
938void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
939{
940 cooling_device_stats_setup(cdev);
941 cdev->device.groups = cooling_device_attr_groups;
942}
943
944void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
945{
946 cooling_device_stats_destroy(cdev);
947}
948
949/* these helper will be used only at the time of bindig */
950ssize_t
951trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
952{
953 struct thermal_instance *instance;
954
955 instance =
956 container_of(attr, struct thermal_instance, attr);
957
958 if (instance->trip == THERMAL_TRIPS_NONE)
959 return sprintf(buf, "-1\n");
960 else
961 return sprintf(buf, "%d\n", instance->trip);
962}
963
964ssize_t
965weight_show(struct device *dev, struct device_attribute *attr, char *buf)
966{
967 struct thermal_instance *instance;
968
969 instance = container_of(attr, struct thermal_instance, weight_attr);
970
971 return sprintf(buf, "%d\n", instance->weight);
972}
973
974ssize_t weight_store(struct device *dev, struct device_attribute *attr,
975 const char *buf, size_t count)
976{
977 struct thermal_instance *instance;
978 int ret, weight;
979
980 ret = kstrtoint(buf, 0, &weight);
981 if (ret)
982 return ret;
983
984 instance = container_of(attr, struct thermal_instance, weight_attr);
985 instance->weight = weight;
986
987 return count;
988}