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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
220policy_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 char name[THERMAL_NAME_LENGTH];
225 int ret;
226
227 snprintf(name, sizeof(name), "%s", buf);
228
229 ret = thermal_zone_device_set_policy(tz, name);
230 if (!ret)
231 ret = count;
232
233 return ret;
234}
235
236static ssize_t
237policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
238{
239 struct thermal_zone_device *tz = to_thermal_zone(dev);
240
241 return sprintf(buf, "%s\n", tz->governor->name);
242}
243
244static ssize_t
245available_policies_show(struct device *dev, struct device_attribute *devattr,
246 char *buf)
247{
248 return thermal_build_list_of_policies(buf);
249}
250
251#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
252static ssize_t
253emul_temp_store(struct device *dev, struct device_attribute *attr,
254 const char *buf, size_t count)
255{
256 struct thermal_zone_device *tz = to_thermal_zone(dev);
257 int ret = 0;
258 int temperature;
259
260 if (kstrtoint(buf, 10, &temperature))
261 return -EINVAL;
262
263 if (!tz->ops->set_emul_temp) {
264 mutex_lock(&tz->lock);
265 tz->emul_temperature = temperature;
266 mutex_unlock(&tz->lock);
267 } else {
268 ret = tz->ops->set_emul_temp(tz, temperature);
269 }
270
271 if (!ret)
272 thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
273
274 return ret ? ret : count;
275}
276static DEVICE_ATTR_WO(emul_temp);
277#endif
278
279static ssize_t
280sustainable_power_show(struct device *dev, struct device_attribute *devattr,
281 char *buf)
282{
283 struct thermal_zone_device *tz = to_thermal_zone(dev);
284
285 if (tz->tzp)
286 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
287 else
288 return -EIO;
289}
290
291static ssize_t
292sustainable_power_store(struct device *dev, struct device_attribute *devattr,
293 const char *buf, size_t count)
294{
295 struct thermal_zone_device *tz = to_thermal_zone(dev);
296 u32 sustainable_power;
297
298 if (!tz->tzp)
299 return -EIO;
300
301 if (kstrtou32(buf, 10, &sustainable_power))
302 return -EINVAL;
303
304 tz->tzp->sustainable_power = sustainable_power;
305
306 return count;
307}
308
309#define create_s32_tzp_attr(name) \
310 static ssize_t \
311 name##_show(struct device *dev, struct device_attribute *devattr, \
312 char *buf) \
313 { \
314 struct thermal_zone_device *tz = to_thermal_zone(dev); \
315 \
316 if (tz->tzp) \
317 return sprintf(buf, "%d\n", tz->tzp->name); \
318 else \
319 return -EIO; \
320 } \
321 \
322 static ssize_t \
323 name##_store(struct device *dev, struct device_attribute *devattr, \
324 const char *buf, size_t count) \
325 { \
326 struct thermal_zone_device *tz = to_thermal_zone(dev); \
327 s32 value; \
328 \
329 if (!tz->tzp) \
330 return -EIO; \
331 \
332 if (kstrtos32(buf, 10, &value)) \
333 return -EINVAL; \
334 \
335 tz->tzp->name = value; \
336 \
337 return count; \
338 } \
339 static DEVICE_ATTR_RW(name)
340
341create_s32_tzp_attr(k_po);
342create_s32_tzp_attr(k_pu);
343create_s32_tzp_attr(k_i);
344create_s32_tzp_attr(k_d);
345create_s32_tzp_attr(integral_cutoff);
346create_s32_tzp_attr(slope);
347create_s32_tzp_attr(offset);
348#undef create_s32_tzp_attr
349
350/*
351 * These are thermal zone device attributes that will always be present.
352 * All the attributes created for tzp (create_s32_tzp_attr) also are always
353 * present on the sysfs interface.
354 */
355static DEVICE_ATTR_RO(type);
356static DEVICE_ATTR_RO(temp);
357static DEVICE_ATTR_RW(policy);
358static DEVICE_ATTR_RO(available_policies);
359static DEVICE_ATTR_RW(sustainable_power);
360
361/* These thermal zone device attributes are created based on conditions */
362static DEVICE_ATTR_RW(mode);
363
364/* These attributes are unconditionally added to a thermal zone */
365static struct attribute *thermal_zone_dev_attrs[] = {
366 &dev_attr_type.attr,
367 &dev_attr_temp.attr,
368#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
369 &dev_attr_emul_temp.attr,
370#endif
371 &dev_attr_policy.attr,
372 &dev_attr_available_policies.attr,
373 &dev_attr_sustainable_power.attr,
374 &dev_attr_k_po.attr,
375 &dev_attr_k_pu.attr,
376 &dev_attr_k_i.attr,
377 &dev_attr_k_d.attr,
378 &dev_attr_integral_cutoff.attr,
379 &dev_attr_slope.attr,
380 &dev_attr_offset.attr,
381 NULL,
382};
383
384static const struct attribute_group thermal_zone_attribute_group = {
385 .attrs = thermal_zone_dev_attrs,
386};
387
388static struct attribute *thermal_zone_mode_attrs[] = {
389 &dev_attr_mode.attr,
390 NULL,
391};
392
393static const struct attribute_group thermal_zone_mode_attribute_group = {
394 .attrs = thermal_zone_mode_attrs,
395};
396
397static const struct attribute_group *thermal_zone_attribute_groups[] = {
398 &thermal_zone_attribute_group,
399 &thermal_zone_mode_attribute_group,
400 /* This is not NULL terminated as we create the group dynamically */
401};
402
403/**
404 * create_trip_attrs() - create attributes for trip points
405 * @tz: the thermal zone device
406 * @mask: Writeable trip point bitmap.
407 *
408 * helper function to instantiate sysfs entries for every trip
409 * point and its properties of a struct thermal_zone_device.
410 *
411 * Return: 0 on success, the proper error value otherwise.
412 */
413static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
414{
415 struct attribute **attrs;
416 int indx;
417
418 /* This function works only for zones with at least one trip */
419 if (tz->trips <= 0)
420 return -EINVAL;
421
422 tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
423 GFP_KERNEL);
424 if (!tz->trip_type_attrs)
425 return -ENOMEM;
426
427 tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
428 GFP_KERNEL);
429 if (!tz->trip_temp_attrs) {
430 kfree(tz->trip_type_attrs);
431 return -ENOMEM;
432 }
433
434 if (tz->ops->get_trip_hyst) {
435 tz->trip_hyst_attrs = kcalloc(tz->trips,
436 sizeof(*tz->trip_hyst_attrs),
437 GFP_KERNEL);
438 if (!tz->trip_hyst_attrs) {
439 kfree(tz->trip_type_attrs);
440 kfree(tz->trip_temp_attrs);
441 return -ENOMEM;
442 }
443 }
444
445 attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
446 if (!attrs) {
447 kfree(tz->trip_type_attrs);
448 kfree(tz->trip_temp_attrs);
449 if (tz->ops->get_trip_hyst)
450 kfree(tz->trip_hyst_attrs);
451 return -ENOMEM;
452 }
453
454 for (indx = 0; indx < tz->trips; indx++) {
455 /* create trip type attribute */
456 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
457 "trip_point_%d_type", indx);
458
459 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
460 tz->trip_type_attrs[indx].attr.attr.name =
461 tz->trip_type_attrs[indx].name;
462 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
463 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
464 attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
465
466 /* create trip temp attribute */
467 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
468 "trip_point_%d_temp", indx);
469
470 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
471 tz->trip_temp_attrs[indx].attr.attr.name =
472 tz->trip_temp_attrs[indx].name;
473 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
474 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
475 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
476 mask & (1 << indx)) {
477 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
478 tz->trip_temp_attrs[indx].attr.store =
479 trip_point_temp_store;
480 }
481 attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
482
483 /* create Optional trip hyst attribute */
484 if (!tz->ops->get_trip_hyst)
485 continue;
486 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
487 "trip_point_%d_hyst", indx);
488
489 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
490 tz->trip_hyst_attrs[indx].attr.attr.name =
491 tz->trip_hyst_attrs[indx].name;
492 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
493 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
494 if (tz->ops->set_trip_hyst) {
495 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
496 tz->trip_hyst_attrs[indx].attr.store =
497 trip_point_hyst_store;
498 }
499 attrs[indx + tz->trips * 2] =
500 &tz->trip_hyst_attrs[indx].attr.attr;
501 }
502 attrs[tz->trips * 3] = NULL;
503
504 tz->trips_attribute_group.attrs = attrs;
505
506 return 0;
507}
508
509/**
510 * destroy_trip_attrs() - destroy attributes for trip points
511 * @tz: the thermal zone device
512 *
513 * helper function to free resources allocated by create_trip_attrs()
514 */
515static void destroy_trip_attrs(struct thermal_zone_device *tz)
516{
517 if (!tz)
518 return;
519
520 kfree(tz->trip_type_attrs);
521 kfree(tz->trip_temp_attrs);
522 if (tz->ops->get_trip_hyst)
523 kfree(tz->trip_hyst_attrs);
524 kfree(tz->trips_attribute_group.attrs);
525}
526
527int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
528 int mask)
529{
530 const struct attribute_group **groups;
531 int i, size, result;
532
533 /* we need one extra for trips and the NULL to terminate the array */
534 size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
535 /* This also takes care of API requirement to be NULL terminated */
536 groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
537 if (!groups)
538 return -ENOMEM;
539
540 for (i = 0; i < size - 2; i++)
541 groups[i] = thermal_zone_attribute_groups[i];
542
543 if (tz->trips) {
544 result = create_trip_attrs(tz, mask);
545 if (result) {
546 kfree(groups);
547
548 return result;
549 }
550
551 groups[size - 2] = &tz->trips_attribute_group;
552 }
553
554 tz->device.groups = groups;
555
556 return 0;
557}
558
559void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
560{
561 if (!tz)
562 return;
563
564 if (tz->trips)
565 destroy_trip_attrs(tz);
566
567 kfree(tz->device.groups);
568}
569
570/* sys I/F for cooling device */
571static ssize_t
572cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
573{
574 struct thermal_cooling_device *cdev = to_cooling_device(dev);
575
576 return sprintf(buf, "%s\n", cdev->type);
577}
578
579static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
580 char *buf)
581{
582 struct thermal_cooling_device *cdev = to_cooling_device(dev);
583 unsigned long state;
584 int ret;
585
586 ret = cdev->ops->get_max_state(cdev, &state);
587 if (ret)
588 return ret;
589 return sprintf(buf, "%ld\n", state);
590}
591
592static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
593 char *buf)
594{
595 struct thermal_cooling_device *cdev = to_cooling_device(dev);
596 unsigned long state;
597 int ret;
598
599 ret = cdev->ops->get_cur_state(cdev, &state);
600 if (ret)
601 return ret;
602 return sprintf(buf, "%ld\n", state);
603}
604
605static ssize_t
606cur_state_store(struct device *dev, struct device_attribute *attr,
607 const char *buf, size_t count)
608{
609 struct thermal_cooling_device *cdev = to_cooling_device(dev);
610 unsigned long state;
611 int result;
612
613 if (sscanf(buf, "%ld\n", &state) != 1)
614 return -EINVAL;
615
616 if ((long)state < 0)
617 return -EINVAL;
618
619 mutex_lock(&cdev->lock);
620
621 result = cdev->ops->set_cur_state(cdev, state);
622 if (!result)
623 thermal_cooling_device_stats_update(cdev, state);
624
625 mutex_unlock(&cdev->lock);
626 return result ? result : count;
627}
628
629static struct device_attribute
630dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
631static DEVICE_ATTR_RO(max_state);
632static DEVICE_ATTR_RW(cur_state);
633
634static struct attribute *cooling_device_attrs[] = {
635 &dev_attr_cdev_type.attr,
636 &dev_attr_max_state.attr,
637 &dev_attr_cur_state.attr,
638 NULL,
639};
640
641static const struct attribute_group cooling_device_attr_group = {
642 .attrs = cooling_device_attrs,
643};
644
645static const struct attribute_group *cooling_device_attr_groups[] = {
646 &cooling_device_attr_group,
647 NULL, /* Space allocated for cooling_device_stats_attr_group */
648 NULL,
649};
650
651#ifdef CONFIG_THERMAL_STATISTICS
652struct cooling_dev_stats {
653 spinlock_t lock;
654 unsigned int total_trans;
655 unsigned long state;
656 unsigned long max_states;
657 ktime_t last_time;
658 ktime_t *time_in_state;
659 unsigned int *trans_table;
660};
661
662static void update_time_in_state(struct cooling_dev_stats *stats)
663{
664 ktime_t now = ktime_get(), delta;
665
666 delta = ktime_sub(now, stats->last_time);
667 stats->time_in_state[stats->state] =
668 ktime_add(stats->time_in_state[stats->state], delta);
669 stats->last_time = now;
670}
671
672void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
673 unsigned long new_state)
674{
675 struct cooling_dev_stats *stats = cdev->stats;
676
677 if (!stats)
678 return;
679
680 spin_lock(&stats->lock);
681
682 if (stats->state == new_state)
683 goto unlock;
684
685 update_time_in_state(stats);
686 stats->trans_table[stats->state * stats->max_states + new_state]++;
687 stats->state = new_state;
688 stats->total_trans++;
689
690unlock:
691 spin_unlock(&stats->lock);
692}
693
694static ssize_t total_trans_show(struct device *dev,
695 struct device_attribute *attr, char *buf)
696{
697 struct thermal_cooling_device *cdev = to_cooling_device(dev);
698 struct cooling_dev_stats *stats = cdev->stats;
699 int ret;
700
701 spin_lock(&stats->lock);
702 ret = sprintf(buf, "%u\n", stats->total_trans);
703 spin_unlock(&stats->lock);
704
705 return ret;
706}
707
708static ssize_t
709time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
710 char *buf)
711{
712 struct thermal_cooling_device *cdev = to_cooling_device(dev);
713 struct cooling_dev_stats *stats = cdev->stats;
714 ssize_t len = 0;
715 int i;
716
717 spin_lock(&stats->lock);
718 update_time_in_state(stats);
719
720 for (i = 0; i < stats->max_states; i++) {
721 len += sprintf(buf + len, "state%u\t%llu\n", i,
722 ktime_to_ms(stats->time_in_state[i]));
723 }
724 spin_unlock(&stats->lock);
725
726 return len;
727}
728
729static ssize_t
730reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
731 size_t count)
732{
733 struct thermal_cooling_device *cdev = to_cooling_device(dev);
734 struct cooling_dev_stats *stats = cdev->stats;
735 int i, states = stats->max_states;
736
737 spin_lock(&stats->lock);
738
739 stats->total_trans = 0;
740 stats->last_time = ktime_get();
741 memset(stats->trans_table, 0,
742 states * states * sizeof(*stats->trans_table));
743
744 for (i = 0; i < stats->max_states; i++)
745 stats->time_in_state[i] = ktime_set(0, 0);
746
747 spin_unlock(&stats->lock);
748
749 return count;
750}
751
752static ssize_t trans_table_show(struct device *dev,
753 struct device_attribute *attr, char *buf)
754{
755 struct thermal_cooling_device *cdev = to_cooling_device(dev);
756 struct cooling_dev_stats *stats = cdev->stats;
757 ssize_t len = 0;
758 int i, j;
759
760 len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n");
761 len += snprintf(buf + len, PAGE_SIZE - len, " : ");
762 for (i = 0; i < stats->max_states; i++) {
763 if (len >= PAGE_SIZE)
764 break;
765 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i);
766 }
767 if (len >= PAGE_SIZE)
768 return PAGE_SIZE;
769
770 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
771
772 for (i = 0; i < stats->max_states; i++) {
773 if (len >= PAGE_SIZE)
774 break;
775
776 len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i);
777
778 for (j = 0; j < stats->max_states; j++) {
779 if (len >= PAGE_SIZE)
780 break;
781 len += snprintf(buf + len, PAGE_SIZE - len, "%8u ",
782 stats->trans_table[i * stats->max_states + j]);
783 }
784 if (len >= PAGE_SIZE)
785 break;
786 len += snprintf(buf + len, PAGE_SIZE - len, "\n");
787 }
788
789 if (len >= PAGE_SIZE) {
790 pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
791 return -EFBIG;
792 }
793 return len;
794}
795
796static DEVICE_ATTR_RO(total_trans);
797static DEVICE_ATTR_RO(time_in_state_ms);
798static DEVICE_ATTR_WO(reset);
799static DEVICE_ATTR_RO(trans_table);
800
801static struct attribute *cooling_device_stats_attrs[] = {
802 &dev_attr_total_trans.attr,
803 &dev_attr_time_in_state_ms.attr,
804 &dev_attr_reset.attr,
805 &dev_attr_trans_table.attr,
806 NULL
807};
808
809static const struct attribute_group cooling_device_stats_attr_group = {
810 .attrs = cooling_device_stats_attrs,
811 .name = "stats"
812};
813
814static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
815{
816 struct cooling_dev_stats *stats;
817 unsigned long states;
818 int var;
819
820 if (cdev->ops->get_max_state(cdev, &states))
821 return;
822
823 states++; /* Total number of states is highest state + 1 */
824
825 var = sizeof(*stats);
826 var += sizeof(*stats->time_in_state) * states;
827 var += sizeof(*stats->trans_table) * states * states;
828
829 stats = kzalloc(var, GFP_KERNEL);
830 if (!stats)
831 return;
832
833 stats->time_in_state = (ktime_t *)(stats + 1);
834 stats->trans_table = (unsigned int *)(stats->time_in_state + states);
835 cdev->stats = stats;
836 stats->last_time = ktime_get();
837 stats->max_states = states;
838
839 spin_lock_init(&stats->lock);
840
841 /* Fill the empty slot left in cooling_device_attr_groups */
842 var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
843 cooling_device_attr_groups[var] = &cooling_device_stats_attr_group;
844}
845
846static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
847{
848 kfree(cdev->stats);
849 cdev->stats = NULL;
850}
851
852#else
853
854static inline void
855cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
856static inline void
857cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
858
859#endif /* CONFIG_THERMAL_STATISTICS */
860
861void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
862{
863 cooling_device_stats_setup(cdev);
864 cdev->device.groups = cooling_device_attr_groups;
865}
866
867void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
868{
869 cooling_device_stats_destroy(cdev);
870}
871
872/* these helper will be used only at the time of bindig */
873ssize_t
874trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
875{
876 struct thermal_instance *instance;
877
878 instance =
879 container_of(attr, struct thermal_instance, attr);
880
881 return sprintf(buf, "%d\n", instance->trip);
882}
883
884ssize_t
885weight_show(struct device *dev, struct device_attribute *attr, char *buf)
886{
887 struct thermal_instance *instance;
888
889 instance = container_of(attr, struct thermal_instance, weight_attr);
890
891 return sprintf(buf, "%d\n", instance->weight);
892}
893
894ssize_t weight_store(struct device *dev, struct device_attribute *attr,
895 const char *buf, size_t count)
896{
897 struct thermal_instance *instance;
898 int ret, weight;
899
900 ret = kstrtoint(buf, 0, &weight);
901 if (ret)
902 return ret;
903
904 instance = container_of(attr, struct thermal_instance, weight_attr);
905 instance->weight = weight;
906
907 return count;
908}