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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}
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 enum thermal_device_mode mode;
53 int result;
54
55 if (!tz->ops->get_mode)
56 return -EPERM;
57
58 result = tz->ops->get_mode(tz, &mode);
59 if (result)
60 return result;
61
62 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
63 : "disabled");
64}
65
66static ssize_t
67mode_store(struct device *dev, struct device_attribute *attr,
68 const char *buf, size_t count)
69{
70 struct thermal_zone_device *tz = to_thermal_zone(dev);
71 int result;
72
73 if (!tz->ops->set_mode)
74 return -EPERM;
75
76 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
77 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
78 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
79 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
80 else
81 result = -EINVAL;
82
83 if (result)
84 return result;
85
86 return count;
87}
88
89static ssize_t
90trip_point_type_show(struct device *dev, struct device_attribute *attr,
91 char *buf)
92{
93 struct thermal_zone_device *tz = to_thermal_zone(dev);
94 enum thermal_trip_type type;
95 int trip, result;
96
97 if (!tz->ops->get_trip_type)
98 return -EPERM;
99
100 if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
101 return -EINVAL;
102
103 result = tz->ops->get_trip_type(tz, trip, &type);
104 if (result)
105 return result;
106
107 switch (type) {
108 case THERMAL_TRIP_CRITICAL:
109 return sprintf(buf, "critical\n");
110 case THERMAL_TRIP_HOT:
111 return sprintf(buf, "hot\n");
112 case THERMAL_TRIP_PASSIVE:
113 return sprintf(buf, "passive\n");
114 case THERMAL_TRIP_ACTIVE:
115 return sprintf(buf, "active\n");
116 default:
117 return sprintf(buf, "unknown\n");
118 }
119}
120
121static ssize_t
122trip_point_temp_store(struct device *dev, struct device_attribute *attr,
123 const char *buf, size_t count)
124{
125 struct thermal_zone_device *tz = to_thermal_zone(dev);
126 int trip, ret;
127 int temperature;
128
129 if (!tz->ops->set_trip_temp)
130 return -EPERM;
131
132 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
133 return -EINVAL;
134
135 if (kstrtoint(buf, 10, &temperature))
136 return -EINVAL;
137
138 ret = tz->ops->set_trip_temp(tz, trip, temperature);
139 if (ret)
140 return ret;
141
142 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
143
144 return count;
145}
146
147static ssize_t
148trip_point_temp_show(struct device *dev, struct device_attribute *attr,
149 char *buf)
150{
151 struct thermal_zone_device *tz = to_thermal_zone(dev);
152 int trip, ret;
153 int temperature;
154
155 if (!tz->ops->get_trip_temp)
156 return -EPERM;
157
158 if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
159 return -EINVAL;
160
161 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
162
163 if (ret)
164 return ret;
165
166 return sprintf(buf, "%d\n", temperature);
167}
168
169static ssize_t
170trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
171 const char *buf, size_t count)
172{
173 struct thermal_zone_device *tz = to_thermal_zone(dev);
174 int trip, ret;
175 int temperature;
176
177 if (!tz->ops->set_trip_hyst)
178 return -EPERM;
179
180 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
181 return -EINVAL;
182
183 if (kstrtoint(buf, 10, &temperature))
184 return -EINVAL;
185
186 /*
187 * We are not doing any check on the 'temperature' value
188 * here. The driver implementing 'set_trip_hyst' has to
189 * take care of this.
190 */
191 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
192
193 if (!ret)
194 thermal_zone_set_trips(tz);
195
196 return ret ? ret : count;
197}
198
199static ssize_t
200trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
201 char *buf)
202{
203 struct thermal_zone_device *tz = to_thermal_zone(dev);
204 int trip, ret;
205 int temperature;
206
207 if (!tz->ops->get_trip_hyst)
208 return -EPERM;
209
210 if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
211 return -EINVAL;
212
213 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
214
215 return ret ? ret : sprintf(buf, "%d\n", temperature);
216}
217
218static ssize_t
219passive_store(struct device *dev, struct device_attribute *attr,
220 const char *buf, size_t count)
221{
222 struct thermal_zone_device *tz = to_thermal_zone(dev);
223 int state;
224
225 if (sscanf(buf, "%d\n", &state) != 1)
226 return -EINVAL;
227
228 /* sanity check: values below 1000 millicelcius don't make sense
229 * and can cause the system to go into a thermal heart attack
230 */
231 if (state && state < 1000)
232 return -EINVAL;
233
234 if (state && !tz->forced_passive) {
235 if (!tz->passive_delay)
236 tz->passive_delay = 1000;
237 thermal_zone_device_rebind_exception(tz, "Processor",
238 sizeof("Processor"));
239 } else if (!state && tz->forced_passive) {
240 tz->passive_delay = 0;
241 thermal_zone_device_unbind_exception(tz, "Processor",
242 sizeof("Processor"));
243 }
244
245 tz->forced_passive = state;
246
247 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
248
249 return count;
250}
251
252static ssize_t
253passive_show(struct device *dev, struct device_attribute *attr,
254 char *buf)
255{
256 struct thermal_zone_device *tz = to_thermal_zone(dev);
257
258 return sprintf(buf, "%d\n", tz->forced_passive);
259}
260
261static ssize_t
262policy_store(struct device *dev, struct device_attribute *attr,
263 const char *buf, size_t count)
264{
265 struct thermal_zone_device *tz = to_thermal_zone(dev);
266 char name[THERMAL_NAME_LENGTH];
267 int ret;
268
269 snprintf(name, sizeof(name), "%s", buf);
270
271 ret = thermal_zone_device_set_policy(tz, name);
272 if (!ret)
273 ret = count;
274
275 return ret;
276}
277
278static ssize_t
279policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
280{
281 struct thermal_zone_device *tz = to_thermal_zone(dev);
282
283 return sprintf(buf, "%s\n", tz->governor->name);
284}
285
286static ssize_t
287available_policies_show(struct device *dev, struct device_attribute *devattr,
288 char *buf)
289{
290 return thermal_build_list_of_policies(buf);
291}
292
293#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
294static ssize_t
295emul_temp_store(struct device *dev, struct device_attribute *attr,
296 const char *buf, size_t count)
297{
298 struct thermal_zone_device *tz = to_thermal_zone(dev);
299 int ret = 0;
300 int temperature;
301
302 if (kstrtoint(buf, 10, &temperature))
303 return -EINVAL;
304
305 if (!tz->ops->set_emul_temp) {
306 mutex_lock(&tz->lock);
307 tz->emul_temperature = temperature;
308 mutex_unlock(&tz->lock);
309 } else {
310 ret = tz->ops->set_emul_temp(tz, temperature);
311 }
312
313 if (!ret)
314 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
315
316 return ret ? ret : count;
317}
318static DEVICE_ATTR_WO(emul_temp);
319#endif
320
321static ssize_t
322sustainable_power_show(struct device *dev, struct device_attribute *devattr,
323 char *buf)
324{
325 struct thermal_zone_device *tz = to_thermal_zone(dev);
326
327 if (tz->tzp)
328 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
329 else
330 return -EIO;
331}
332
333static ssize_t
334sustainable_power_store(struct device *dev, struct device_attribute *devattr,
335 const char *buf, size_t count)
336{
337 struct thermal_zone_device *tz = to_thermal_zone(dev);
338 u32 sustainable_power;
339
340 if (!tz->tzp)
341 return -EIO;
342
343 if (kstrtou32(buf, 10, &sustainable_power))
344 return -EINVAL;
345
346 tz->tzp->sustainable_power = sustainable_power;
347
348 return count;
349}
350
351#define create_s32_tzp_attr(name) \
352 static ssize_t \
353 name##_show(struct device *dev, struct device_attribute *devattr, \
354 char *buf) \
355 { \
356 struct thermal_zone_device *tz = to_thermal_zone(dev); \
357 \
358 if (tz->tzp) \
359 return sprintf(buf, "%d\n", tz->tzp->name); \
360 else \
361 return -EIO; \
362 } \
363 \
364 static ssize_t \
365 name##_store(struct device *dev, struct device_attribute *devattr, \
366 const char *buf, size_t count) \
367 { \
368 struct thermal_zone_device *tz = to_thermal_zone(dev); \
369 s32 value; \
370 \
371 if (!tz->tzp) \
372 return -EIO; \
373 \
374 if (kstrtos32(buf, 10, &value)) \
375 return -EINVAL; \
376 \
377 tz->tzp->name = value; \
378 \
379 return count; \
380 } \
381 static DEVICE_ATTR_RW(name)
382
383create_s32_tzp_attr(k_po);
384create_s32_tzp_attr(k_pu);
385create_s32_tzp_attr(k_i);
386create_s32_tzp_attr(k_d);
387create_s32_tzp_attr(integral_cutoff);
388create_s32_tzp_attr(slope);
389create_s32_tzp_attr(offset);
390#undef create_s32_tzp_attr
391
392/*
393 * These are thermal zone device attributes that will always be present.
394 * All the attributes created for tzp (create_s32_tzp_attr) also are always
395 * present on the sysfs interface.
396 */
397static DEVICE_ATTR_RO(type);
398static DEVICE_ATTR_RO(temp);
399static DEVICE_ATTR_RW(policy);
400static DEVICE_ATTR_RO(available_policies);
401static DEVICE_ATTR_RW(sustainable_power);
402
403/* These thermal zone device attributes are created based on conditions */
404static DEVICE_ATTR_RW(mode);
405static DEVICE_ATTR_RW(passive);
406
407/* These attributes are unconditionally added to a thermal zone */
408static struct attribute *thermal_zone_dev_attrs[] = {
409 &dev_attr_type.attr,
410 &dev_attr_temp.attr,
411#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
412 &dev_attr_emul_temp.attr,
413#endif
414 &dev_attr_policy.attr,
415 &dev_attr_available_policies.attr,
416 &dev_attr_sustainable_power.attr,
417 &dev_attr_k_po.attr,
418 &dev_attr_k_pu.attr,
419 &dev_attr_k_i.attr,
420 &dev_attr_k_d.attr,
421 &dev_attr_integral_cutoff.attr,
422 &dev_attr_slope.attr,
423 &dev_attr_offset.attr,
424 NULL,
425};
426
427static struct attribute_group thermal_zone_attribute_group = {
428 .attrs = thermal_zone_dev_attrs,
429};
430
431/* We expose mode only if .get_mode is present */
432static struct attribute *thermal_zone_mode_attrs[] = {
433 &dev_attr_mode.attr,
434 NULL,
435};
436
437static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
438 struct attribute *attr,
439 int attrno)
440{
441 struct device *dev = container_of(kobj, struct device, kobj);
442 struct thermal_zone_device *tz;
443
444 tz = container_of(dev, struct thermal_zone_device, device);
445
446 if (tz->ops->get_mode)
447 return attr->mode;
448
449 return 0;
450}
451
452static struct attribute_group thermal_zone_mode_attribute_group = {
453 .attrs = thermal_zone_mode_attrs,
454 .is_visible = thermal_zone_mode_is_visible,
455};
456
457/* We expose passive only if passive trips are present */
458static struct attribute *thermal_zone_passive_attrs[] = {
459 &dev_attr_passive.attr,
460 NULL,
461};
462
463static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
464 struct attribute *attr,
465 int attrno)
466{
467 struct device *dev = container_of(kobj, struct device, kobj);
468 struct thermal_zone_device *tz;
469 enum thermal_trip_type trip_type;
470 int count, passive = 0;
471
472 tz = container_of(dev, struct thermal_zone_device, device);
473
474 for (count = 0; count < tz->trips && !passive; count++) {
475 tz->ops->get_trip_type(tz, count, &trip_type);
476
477 if (trip_type == THERMAL_TRIP_PASSIVE)
478 passive = 1;
479 }
480
481 if (!passive)
482 return attr->mode;
483
484 return 0;
485}
486
487static struct attribute_group thermal_zone_passive_attribute_group = {
488 .attrs = thermal_zone_passive_attrs,
489 .is_visible = thermal_zone_passive_is_visible,
490};
491
492static const struct attribute_group *thermal_zone_attribute_groups[] = {
493 &thermal_zone_attribute_group,
494 &thermal_zone_mode_attribute_group,
495 &thermal_zone_passive_attribute_group,
496 /* This is not NULL terminated as we create the group dynamically */
497};
498
499/**
500 * create_trip_attrs() - create attributes for trip points
501 * @tz: the thermal zone device
502 * @mask: Writeable trip point bitmap.
503 *
504 * helper function to instantiate sysfs entries for every trip
505 * point and its properties of a struct thermal_zone_device.
506 *
507 * Return: 0 on success, the proper error value otherwise.
508 */
509static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
510{
511 struct attribute **attrs;
512 int indx;
513
514 /* This function works only for zones with at least one trip */
515 if (tz->trips <= 0)
516 return -EINVAL;
517
518 tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
519 GFP_KERNEL);
520 if (!tz->trip_type_attrs)
521 return -ENOMEM;
522
523 tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
524 GFP_KERNEL);
525 if (!tz->trip_temp_attrs) {
526 kfree(tz->trip_type_attrs);
527 return -ENOMEM;
528 }
529
530 if (tz->ops->get_trip_hyst) {
531 tz->trip_hyst_attrs = kcalloc(tz->trips,
532 sizeof(*tz->trip_hyst_attrs),
533 GFP_KERNEL);
534 if (!tz->trip_hyst_attrs) {
535 kfree(tz->trip_type_attrs);
536 kfree(tz->trip_temp_attrs);
537 return -ENOMEM;
538 }
539 }
540
541 attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
542 if (!attrs) {
543 kfree(tz->trip_type_attrs);
544 kfree(tz->trip_temp_attrs);
545 if (tz->ops->get_trip_hyst)
546 kfree(tz->trip_hyst_attrs);
547 return -ENOMEM;
548 }
549
550 for (indx = 0; indx < tz->trips; indx++) {
551 /* create trip type attribute */
552 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
553 "trip_point_%d_type", indx);
554
555 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
556 tz->trip_type_attrs[indx].attr.attr.name =
557 tz->trip_type_attrs[indx].name;
558 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
559 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
560 attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
561
562 /* create trip temp attribute */
563 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
564 "trip_point_%d_temp", indx);
565
566 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
567 tz->trip_temp_attrs[indx].attr.attr.name =
568 tz->trip_temp_attrs[indx].name;
569 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
570 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
571 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
572 mask & (1 << indx)) {
573 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
574 tz->trip_temp_attrs[indx].attr.store =
575 trip_point_temp_store;
576 }
577 attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
578
579 /* create Optional trip hyst attribute */
580 if (!tz->ops->get_trip_hyst)
581 continue;
582 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
583 "trip_point_%d_hyst", indx);
584
585 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
586 tz->trip_hyst_attrs[indx].attr.attr.name =
587 tz->trip_hyst_attrs[indx].name;
588 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
589 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
590 if (tz->ops->set_trip_hyst) {
591 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
592 tz->trip_hyst_attrs[indx].attr.store =
593 trip_point_hyst_store;
594 }
595 attrs[indx + tz->trips * 2] =
596 &tz->trip_hyst_attrs[indx].attr.attr;
597 }
598 attrs[tz->trips * 3] = NULL;
599
600 tz->trips_attribute_group.attrs = attrs;
601
602 return 0;
603}
604
605/**
606 * destroy_trip_attrs() - destroy attributes for trip points
607 * @tz: the thermal zone device
608 *
609 * helper function to free resources allocated by create_trip_attrs()
610 */
611static void destroy_trip_attrs(struct thermal_zone_device *tz)
612{
613 if (!tz)
614 return;
615
616 kfree(tz->trip_type_attrs);
617 kfree(tz->trip_temp_attrs);
618 if (tz->ops->get_trip_hyst)
619 kfree(tz->trip_hyst_attrs);
620 kfree(tz->trips_attribute_group.attrs);
621}
622
623int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
624 int mask)
625{
626 const struct attribute_group **groups;
627 int i, size, result;
628
629 /* we need one extra for trips and the NULL to terminate the array */
630 size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
631 /* This also takes care of API requirement to be NULL terminated */
632 groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
633 if (!groups)
634 return -ENOMEM;
635
636 for (i = 0; i < size - 2; i++)
637 groups[i] = thermal_zone_attribute_groups[i];
638
639 if (tz->trips) {
640 result = create_trip_attrs(tz, mask);
641 if (result) {
642 kfree(groups);
643
644 return result;
645 }
646
647 groups[size - 2] = &tz->trips_attribute_group;
648 }
649
650 tz->device.groups = groups;
651
652 return 0;
653}
654
655void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
656{
657 if (!tz)
658 return;
659
660 if (tz->trips)
661 destroy_trip_attrs(tz);
662
663 kfree(tz->device.groups);
664}
665
666/* sys I/F for cooling device */
667static ssize_t
668cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
669{
670 struct thermal_cooling_device *cdev = to_cooling_device(dev);
671
672 return sprintf(buf, "%s\n", cdev->type);
673}
674
675static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
676 char *buf)
677{
678 struct thermal_cooling_device *cdev = to_cooling_device(dev);
679 unsigned long state;
680 int ret;
681
682 ret = cdev->ops->get_max_state(cdev, &state);
683 if (ret)
684 return ret;
685 return sprintf(buf, "%ld\n", state);
686}
687
688static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
689 char *buf)
690{
691 struct thermal_cooling_device *cdev = to_cooling_device(dev);
692 unsigned long state;
693 int ret;
694
695 ret = cdev->ops->get_cur_state(cdev, &state);
696 if (ret)
697 return ret;
698 return sprintf(buf, "%ld\n", state);
699}
700
701static ssize_t
702cur_state_store(struct device *dev, struct device_attribute *attr,
703 const char *buf, size_t count)
704{
705 struct thermal_cooling_device *cdev = to_cooling_device(dev);
706 unsigned long state;
707 int result;
708
709 if (sscanf(buf, "%ld\n", &state) != 1)
710 return -EINVAL;
711
712 if ((long)state < 0)
713 return -EINVAL;
714
715 mutex_lock(&cdev->lock);
716
717 result = cdev->ops->set_cur_state(cdev, state);
718 if (!result)
719 thermal_cooling_device_stats_update(cdev, state);
720
721 mutex_unlock(&cdev->lock);
722 return result ? result : count;
723}
724
725static struct device_attribute
726dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
727static DEVICE_ATTR_RO(max_state);
728static DEVICE_ATTR_RW(cur_state);
729
730static struct attribute *cooling_device_attrs[] = {
731 &dev_attr_cdev_type.attr,
732 &dev_attr_max_state.attr,
733 &dev_attr_cur_state.attr,
734 NULL,
735};
736
737static const struct attribute_group cooling_device_attr_group = {
738 .attrs = cooling_device_attrs,
739};
740
741static const struct attribute_group *cooling_device_attr_groups[] = {
742 &cooling_device_attr_group,
743 NULL, /* Space allocated for cooling_device_stats_attr_group */
744 NULL,
745};
746
747#ifdef CONFIG_THERMAL_STATISTICS
748struct cooling_dev_stats {
749 spinlock_t lock;
750 unsigned int total_trans;
751 unsigned long state;
752 unsigned long max_states;
753 ktime_t last_time;
754 ktime_t *time_in_state;
755 unsigned int *trans_table;
756};
757
758static void update_time_in_state(struct cooling_dev_stats *stats)
759{
760 ktime_t now = ktime_get(), delta;
761
762 delta = ktime_sub(now, stats->last_time);
763 stats->time_in_state[stats->state] =
764 ktime_add(stats->time_in_state[stats->state], delta);
765 stats->last_time = now;
766}
767
768void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
769 unsigned long new_state)
770{
771 struct cooling_dev_stats *stats = cdev->stats;
772
773 spin_lock(&stats->lock);
774
775 if (stats->state == new_state)
776 goto unlock;
777
778 update_time_in_state(stats);
779 stats->trans_table[stats->state * stats->max_states + new_state]++;
780 stats->state = new_state;
781 stats->total_trans++;
782
783unlock:
784 spin_unlock(&stats->lock);
785}
786
787static ssize_t total_trans_show(struct device *dev,
788 struct device_attribute *attr, char *buf)
789{
790 struct thermal_cooling_device *cdev = to_cooling_device(dev);
791 struct cooling_dev_stats *stats = cdev->stats;
792 int ret;
793
794 spin_lock(&stats->lock);
795 ret = sprintf(buf, "%u\n", stats->total_trans);
796 spin_unlock(&stats->lock);
797
798 return ret;
799}
800
801static ssize_t
802time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
803 char *buf)
804{
805 struct thermal_cooling_device *cdev = to_cooling_device(dev);
806 struct cooling_dev_stats *stats = cdev->stats;
807 ssize_t len = 0;
808 int i;
809
810 spin_lock(&stats->lock);
811 update_time_in_state(stats);
812
813 for (i = 0; i < stats->max_states; i++) {
814 len += sprintf(buf + len, "state%u\t%llu\n", i,
815 ktime_to_ms(stats->time_in_state[i]));
816 }
817 spin_unlock(&stats->lock);
818
819 return len;
820}
821
822static ssize_t
823reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
824 size_t count)
825{
826 struct thermal_cooling_device *cdev = to_cooling_device(dev);
827 struct cooling_dev_stats *stats = cdev->stats;
828 int i, states = stats->max_states;
829
830 spin_lock(&stats->lock);
831
832 stats->total_trans = 0;
833 stats->last_time = ktime_get();
834 memset(stats->trans_table, 0,
835 states * states * sizeof(*stats->trans_table));
836
837 for (i = 0; i < stats->max_states; i++)
838 stats->time_in_state[i] = ktime_set(0, 0);
839
840 spin_unlock(&stats->lock);
841
842 return count;
843}
844
845static ssize_t trans_table_show(struct device *dev,
846 struct device_attribute *attr, char *buf)
847{
848 struct thermal_cooling_device *cdev = to_cooling_device(dev);
849 struct cooling_dev_stats *stats = cdev->stats;
850 ssize_t len = 0;
851 int i, j;
852
853 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
854 len += snprintf(buf + len, PAGE_SIZE - len, " : ");
855 for (i = 0; i < stats->max_states; i++) {
856 if (len >= PAGE_SIZE)
857 break;
858 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
859 }
860 if (len >= PAGE_SIZE)
861 return PAGE_SIZE;
862
863 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
864
865 for (i = 0; i < stats->max_states; i++) {
866 if (len >= PAGE_SIZE)
867 break;
868
869 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
870
871 for (j = 0; j < stats->max_states; j++) {
872 if (len >= PAGE_SIZE)
873 break;
874 len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
875 stats->trans_table[i * stats->max_states + j]);
876 }
877 if (len >= PAGE_SIZE)
878 break;
879 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
880 }
881
882 if (len >= PAGE_SIZE) {
883 pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
884 return -EFBIG;
885 }
886 return len;
887}
888
889static DEVICE_ATTR_RO(total_trans);
890static DEVICE_ATTR_RO(time_in_state_ms);
891static DEVICE_ATTR_WO(reset);
892static DEVICE_ATTR_RO(trans_table);
893
894static struct attribute *cooling_device_stats_attrs[] = {
895 &dev_attr_total_trans.attr,
896 &dev_attr_time_in_state_ms.attr,
897 &dev_attr_reset.attr,
898 &dev_attr_trans_table.attr,
899 NULL
900};
901
902static const struct attribute_group cooling_device_stats_attr_group = {
903 .attrs = cooling_device_stats_attrs,
904 .name = "stats"
905};
906
907static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
908{
909 struct cooling_dev_stats *stats;
910 unsigned long states;
911 int var;
912
913 if (cdev->ops->get_max_state(cdev, &states))
914 return;
915
916 states++; /* Total number of states is highest state + 1 */
917
918 var = sizeof(*stats);
919 var += sizeof(*stats->time_in_state) * states;
920 var += sizeof(*stats->trans_table) * states * states;
921
922 stats = kzalloc(var, GFP_KERNEL);
923 if (!stats)
924 return;
925
926 stats->time_in_state = (ktime_t *)(stats + 1);
927 stats->trans_table = (unsigned int *)(stats->time_in_state + states);
928 cdev->stats = stats;
929 stats->last_time = ktime_get();
930 stats->max_states = states;
931
932 spin_lock_init(&stats->lock);
933
934 /* Fill the empty slot left in cooling_device_attr_groups */
935 var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
936 cooling_device_attr_groups[var] = &cooling_device_stats_attr_group;
937}
938
939static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
940{
941 kfree(cdev->stats);
942 cdev->stats = NULL;
943}
944
945#else
946
947static inline void
948cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
949static inline void
950cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
951
952#endif /* CONFIG_THERMAL_STATISTICS */
953
954void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
955{
956 cooling_device_stats_setup(cdev);
957 cdev->device.groups = cooling_device_attr_groups;
958}
959
960void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
961{
962 cooling_device_stats_destroy(cdev);
963}
964
965/* these helper will be used only at the time of bindig */
966ssize_t
967trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
968{
969 struct thermal_instance *instance;
970
971 instance =
972 container_of(attr, struct thermal_instance, attr);
973
974 if (instance->trip == THERMAL_TRIPS_NONE)
975 return sprintf(buf, "-1\n");
976 else
977 return sprintf(buf, "%d\n", instance->trip);
978}
979
980ssize_t
981weight_show(struct device *dev, struct device_attribute *attr, char *buf)
982{
983 struct thermal_instance *instance;
984
985 instance = container_of(attr, struct thermal_instance, weight_attr);
986
987 return sprintf(buf, "%d\n", instance->weight);
988}
989
990ssize_t weight_store(struct device *dev, struct device_attribute *attr,
991 const char *buf, size_t count)
992{
993 struct thermal_instance *instance;
994 int ret, weight;
995
996 ret = kstrtoint(buf, 0, &weight);
997 if (ret)
998 return ret;
999
1000 instance = container_of(attr, struct thermal_instance, weight_attr);
1001 instance->weight = weight;
1002
1003 return count;
1004}