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7e3c0381 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a369ee88 EV |
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> | |
a369ee88 EV |
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> | |
8ea22951 | 20 | #include <linux/jiffies.h> |
a369ee88 EV |
21 | |
22 | #include "thermal_core.h" | |
23 | ||
24 | /* sys I/F for thermal zone */ | |
25 | ||
26 | static ssize_t | |
27 | type_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 | ||
34 | static ssize_t | |
35 | temp_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 | ||
48 | static ssize_t | |
49 | mode_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 | ||
66 | static ssize_t | |
67 | mode_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 | ||
89 | static ssize_t | |
90 | trip_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 | ||
121 | static ssize_t | |
122 | trip_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 | ||
147 | static ssize_t | |
148 | trip_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 | ||
169 | static ssize_t | |
170 | trip_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 | ||
199 | static ssize_t | |
200 | trip_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 | ||
218 | static ssize_t | |
219 | passive_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 | ||
252 | static ssize_t | |
253 | passive_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 | ||
261 | static ssize_t | |
262 | policy_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 | ||
278 | static ssize_t | |
279 | policy_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 | ||
286 | static ssize_t | |
287 | available_policies_show(struct device *dev, struct device_attribute *devattr, | |
288 | char *buf) | |
289 | { | |
290 | return thermal_build_list_of_policies(buf); | |
291 | } | |
292 | ||
698db4fd | 293 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) |
a369ee88 EV |
294 | static ssize_t |
295 | emul_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 | } | |
6cbaefb4 | 318 | static DEVICE_ATTR_WO(emul_temp); |
698db4fd | 319 | #endif |
a369ee88 EV |
320 | |
321 | static ssize_t | |
322 | sustainable_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 | ||
333 | static ssize_t | |
334 | sustainable_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 | } \ | |
e76a4386 | 381 | static DEVICE_ATTR_RW(name) |
a369ee88 EV |
382 | |
383 | create_s32_tzp_attr(k_po); | |
384 | create_s32_tzp_attr(k_pu); | |
385 | create_s32_tzp_attr(k_i); | |
386 | create_s32_tzp_attr(k_d); | |
387 | create_s32_tzp_attr(integral_cutoff); | |
388 | create_s32_tzp_attr(slope); | |
389 | create_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 | */ | |
c828a892 JP |
397 | static DEVICE_ATTR_RO(type); |
398 | static DEVICE_ATTR_RO(temp); | |
b6b996b6 | 399 | static DEVICE_ATTR_RW(policy); |
c828a892 | 400 | static DEVICE_ATTR_RO(available_policies); |
b6b996b6 | 401 | static DEVICE_ATTR_RW(sustainable_power); |
a369ee88 EV |
402 | |
403 | /* These thermal zone device attributes are created based on conditions */ | |
b6b996b6 JP |
404 | static DEVICE_ATTR_RW(mode); |
405 | static DEVICE_ATTR_RW(passive); | |
a369ee88 EV |
406 | |
407 | /* These attributes are unconditionally added to a thermal zone */ | |
408 | static 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 | ||
427 | static 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 */ | |
432 | static struct attribute *thermal_zone_mode_attrs[] = { | |
433 | &dev_attr_mode.attr, | |
434 | NULL, | |
435 | }; | |
436 | ||
437 | static 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 | ||
452 | static 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 */ | |
458 | static struct attribute *thermal_zone_passive_attrs[] = { | |
459 | &dev_attr_passive.attr, | |
460 | NULL, | |
461 | }; | |
462 | ||
463 | static 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 | ||
487 | static struct attribute_group thermal_zone_passive_attribute_group = { | |
488 | .attrs = thermal_zone_passive_attrs, | |
489 | .is_visible = thermal_zone_passive_is_visible, | |
490 | }; | |
491 | ||
492 | static 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 | */ | |
509 | static int create_trip_attrs(struct thermal_zone_device *tz, int mask) | |
510 | { | |
a369ee88 EV |
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 | ||
b819dc9e EV |
518 | tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs), |
519 | GFP_KERNEL); | |
a369ee88 EV |
520 | if (!tz->trip_type_attrs) |
521 | return -ENOMEM; | |
522 | ||
b819dc9e EV |
523 | tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs), |
524 | GFP_KERNEL); | |
a369ee88 EV |
525 | if (!tz->trip_temp_attrs) { |
526 | kfree(tz->trip_type_attrs); | |
527 | return -ENOMEM; | |
528 | } | |
529 | ||
530 | if (tz->ops->get_trip_hyst) { | |
b819dc9e EV |
531 | tz->trip_hyst_attrs = kcalloc(tz->trips, |
532 | sizeof(*tz->trip_hyst_attrs), | |
533 | GFP_KERNEL); | |
a369ee88 EV |
534 | if (!tz->trip_hyst_attrs) { |
535 | kfree(tz->trip_type_attrs); | |
536 | kfree(tz->trip_temp_attrs); | |
537 | return -ENOMEM; | |
538 | } | |
539 | } | |
540 | ||
b819dc9e | 541 | attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL); |
a369ee88 EV |
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 | ||
32fa5ba3 CJ |
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 | */ | |
611 | static 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 | ||
a369ee88 EV |
623 | int 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 | } | |
45cf2ec9 | 654 | |
32fa5ba3 CJ |
655 | void 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 | ||
45cf2ec9 EV |
666 | /* sys I/F for cooling device */ |
667 | static ssize_t | |
33e678d4 | 668 | cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
669 | { |
670 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
671 | ||
672 | return sprintf(buf, "%s\n", cdev->type); | |
673 | } | |
674 | ||
33e678d4 VK |
675 | static ssize_t max_state_show(struct device *dev, struct device_attribute *attr, |
676 | char *buf) | |
45cf2ec9 EV |
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 | ||
33e678d4 VK |
688 | static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr, |
689 | char *buf) | |
45cf2ec9 EV |
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 | ||
701 | static ssize_t | |
33e678d4 VK |
702 | cur_state_store(struct device *dev, struct device_attribute *attr, |
703 | const char *buf, size_t count) | |
45cf2ec9 EV |
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 | ||
68000a0d TG |
715 | mutex_lock(&cdev->lock); |
716 | ||
45cf2ec9 | 717 | result = cdev->ops->set_cur_state(cdev, state); |
68000a0d TG |
718 | if (!result) |
719 | thermal_cooling_device_stats_update(cdev, state); | |
720 | ||
721 | mutex_unlock(&cdev->lock); | |
722 | return result ? result : count; | |
45cf2ec9 EV |
723 | } |
724 | ||
33e678d4 VK |
725 | static struct device_attribute |
726 | dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL); | |
e76a4386 VK |
727 | static DEVICE_ATTR_RO(max_state); |
728 | static DEVICE_ATTR_RW(cur_state); | |
45cf2ec9 EV |
729 | |
730 | static 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 | ||
737 | static const struct attribute_group cooling_device_attr_group = { | |
738 | .attrs = cooling_device_attrs, | |
739 | }; | |
740 | ||
741 | static const struct attribute_group *cooling_device_attr_groups[] = { | |
742 | &cooling_device_attr_group, | |
8ea22951 | 743 | NULL, /* Space allocated for cooling_device_stats_attr_group */ |
45cf2ec9 EV |
744 | NULL, |
745 | }; | |
746 | ||
8ea22951 VK |
747 | #ifdef CONFIG_THERMAL_STATISTICS |
748 | struct 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 | ||
758 | static 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 | ||
768 | void 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 | ||
783 | unlock: | |
784 | spin_unlock(&stats->lock); | |
785 | } | |
786 | ||
33e678d4 VK |
787 | static ssize_t total_trans_show(struct device *dev, |
788 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
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 | ||
801 | static ssize_t | |
33e678d4 VK |
802 | time_in_state_ms_show(struct device *dev, struct device_attribute *attr, |
803 | char *buf) | |
8ea22951 VK |
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 | ||
822 | static ssize_t | |
33e678d4 VK |
823 | reset_store(struct device *dev, struct device_attribute *attr, const char *buf, |
824 | size_t count) | |
8ea22951 VK |
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 | ||
33e678d4 VK |
845 | static ssize_t trans_table_show(struct device *dev, |
846 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
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 | ||
e76a4386 VK |
889 | static DEVICE_ATTR_RO(total_trans); |
890 | static DEVICE_ATTR_RO(time_in_state_ms); | |
891 | static DEVICE_ATTR_WO(reset); | |
892 | static DEVICE_ATTR_RO(trans_table); | |
8ea22951 VK |
893 | |
894 | static 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 | ||
902 | static const struct attribute_group cooling_device_stats_attr_group = { | |
903 | .attrs = cooling_device_stats_attrs, | |
904 | .name = "stats" | |
905 | }; | |
906 | ||
907 | static 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 | ||
939 | static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev) | |
940 | { | |
941 | kfree(cdev->stats); | |
942 | cdev->stats = NULL; | |
943 | } | |
944 | ||
945 | #else | |
946 | ||
947 | static inline void | |
948 | cooling_device_stats_setup(struct thermal_cooling_device *cdev) {} | |
949 | static inline void | |
950 | cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {} | |
951 | ||
952 | #endif /* CONFIG_THERMAL_STATISTICS */ | |
953 | ||
45cf2ec9 EV |
954 | void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev) |
955 | { | |
8ea22951 | 956 | cooling_device_stats_setup(cdev); |
45cf2ec9 EV |
957 | cdev->device.groups = cooling_device_attr_groups; |
958 | } | |
959 | ||
8ea22951 VK |
960 | void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev) |
961 | { | |
962 | cooling_device_stats_destroy(cdev); | |
963 | } | |
964 | ||
45cf2ec9 EV |
965 | /* these helper will be used only at the time of bindig */ |
966 | ssize_t | |
33e678d4 | 967 | trip_point_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
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 | ||
980 | ssize_t | |
33e678d4 | 981 | weight_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
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 | ||
33e678d4 VK |
990 | ssize_t weight_store(struct device *dev, struct device_attribute *attr, |
991 | const char *buf, size_t count) | |
45cf2ec9 EV |
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 | } |