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