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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); | |
7f4957be | 52 | int enabled = thermal_zone_device_is_enabled(tz); |
a369ee88 | 53 | |
7f4957be | 54 | return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled"); |
a369ee88 EV |
55 | } |
56 | ||
57 | static ssize_t | |
58 | mode_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 | ||
a369ee88 | 64 | if (!strncmp(buf, "enabled", sizeof("enabled") - 1)) |
7f4957be | 65 | result = thermal_zone_device_enable(tz); |
a369ee88 | 66 | else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) |
7f4957be | 67 | result = thermal_zone_device_disable(tz); |
a369ee88 EV |
68 | else |
69 | result = -EINVAL; | |
70 | ||
71 | if (result) | |
72 | return result; | |
73 | ||
74 | return count; | |
75 | } | |
76 | ||
77 | static ssize_t | |
78 | trip_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 | ||
109 | static ssize_t | |
110 | trip_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; | |
55cdf0a2 DL |
115 | int temperature, hyst = 0; |
116 | enum thermal_trip_type type; | |
a369ee88 EV |
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 | ||
55cdf0a2 DL |
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 | ||
a369ee88 EV |
143 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
144 | ||
145 | return count; | |
146 | } | |
147 | ||
148 | static ssize_t | |
149 | trip_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 | ||
170 | static ssize_t | |
171 | trip_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 | ||
200 | static ssize_t | |
201 | trip_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 | ||
219 | static ssize_t | |
220 | passive_store(struct device *dev, struct device_attribute *attr, | |
221 | const char *buf, size_t count) | |
222 | { | |
223 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
224 | int state; | |
225 | ||
226 | if (sscanf(buf, "%d\n", &state) != 1) | |
227 | return -EINVAL; | |
228 | ||
229 | /* sanity check: values below 1000 millicelcius don't make sense | |
230 | * and can cause the system to go into a thermal heart attack | |
231 | */ | |
232 | if (state && state < 1000) | |
233 | return -EINVAL; | |
234 | ||
235 | if (state && !tz->forced_passive) { | |
236 | if (!tz->passive_delay) | |
237 | tz->passive_delay = 1000; | |
238 | thermal_zone_device_rebind_exception(tz, "Processor", | |
239 | sizeof("Processor")); | |
240 | } else if (!state && tz->forced_passive) { | |
241 | tz->passive_delay = 0; | |
242 | thermal_zone_device_unbind_exception(tz, "Processor", | |
243 | sizeof("Processor")); | |
244 | } | |
245 | ||
246 | tz->forced_passive = state; | |
247 | ||
248 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
249 | ||
250 | return count; | |
251 | } | |
252 | ||
253 | static ssize_t | |
254 | passive_show(struct device *dev, struct device_attribute *attr, | |
255 | char *buf) | |
256 | { | |
257 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
258 | ||
259 | return sprintf(buf, "%d\n", tz->forced_passive); | |
260 | } | |
261 | ||
262 | static ssize_t | |
263 | policy_store(struct device *dev, struct device_attribute *attr, | |
264 | const char *buf, size_t count) | |
265 | { | |
266 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
267 | char name[THERMAL_NAME_LENGTH]; | |
268 | int ret; | |
269 | ||
270 | snprintf(name, sizeof(name), "%s", buf); | |
271 | ||
272 | ret = thermal_zone_device_set_policy(tz, name); | |
273 | if (!ret) | |
274 | ret = count; | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | static ssize_t | |
280 | policy_show(struct device *dev, struct device_attribute *devattr, char *buf) | |
281 | { | |
282 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
283 | ||
284 | return sprintf(buf, "%s\n", tz->governor->name); | |
285 | } | |
286 | ||
287 | static ssize_t | |
288 | available_policies_show(struct device *dev, struct device_attribute *devattr, | |
289 | char *buf) | |
290 | { | |
291 | return thermal_build_list_of_policies(buf); | |
292 | } | |
293 | ||
698db4fd | 294 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) |
a369ee88 EV |
295 | static ssize_t |
296 | emul_temp_store(struct device *dev, struct device_attribute *attr, | |
297 | const char *buf, size_t count) | |
298 | { | |
299 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
300 | int ret = 0; | |
301 | int temperature; | |
302 | ||
303 | if (kstrtoint(buf, 10, &temperature)) | |
304 | return -EINVAL; | |
305 | ||
306 | if (!tz->ops->set_emul_temp) { | |
307 | mutex_lock(&tz->lock); | |
308 | tz->emul_temperature = temperature; | |
309 | mutex_unlock(&tz->lock); | |
310 | } else { | |
311 | ret = tz->ops->set_emul_temp(tz, temperature); | |
312 | } | |
313 | ||
314 | if (!ret) | |
315 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
316 | ||
317 | return ret ? ret : count; | |
318 | } | |
6cbaefb4 | 319 | static DEVICE_ATTR_WO(emul_temp); |
698db4fd | 320 | #endif |
a369ee88 EV |
321 | |
322 | static ssize_t | |
323 | sustainable_power_show(struct device *dev, struct device_attribute *devattr, | |
324 | char *buf) | |
325 | { | |
326 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
327 | ||
328 | if (tz->tzp) | |
329 | return sprintf(buf, "%u\n", tz->tzp->sustainable_power); | |
330 | else | |
331 | return -EIO; | |
332 | } | |
333 | ||
334 | static ssize_t | |
335 | sustainable_power_store(struct device *dev, struct device_attribute *devattr, | |
336 | const char *buf, size_t count) | |
337 | { | |
338 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
339 | u32 sustainable_power; | |
340 | ||
341 | if (!tz->tzp) | |
342 | return -EIO; | |
343 | ||
344 | if (kstrtou32(buf, 10, &sustainable_power)) | |
345 | return -EINVAL; | |
346 | ||
347 | tz->tzp->sustainable_power = sustainable_power; | |
348 | ||
349 | return count; | |
350 | } | |
351 | ||
352 | #define create_s32_tzp_attr(name) \ | |
353 | static ssize_t \ | |
354 | name##_show(struct device *dev, struct device_attribute *devattr, \ | |
355 | char *buf) \ | |
356 | { \ | |
357 | struct thermal_zone_device *tz = to_thermal_zone(dev); \ | |
358 | \ | |
359 | if (tz->tzp) \ | |
360 | return sprintf(buf, "%d\n", tz->tzp->name); \ | |
361 | else \ | |
362 | return -EIO; \ | |
363 | } \ | |
364 | \ | |
365 | static ssize_t \ | |
366 | name##_store(struct device *dev, struct device_attribute *devattr, \ | |
367 | const char *buf, size_t count) \ | |
368 | { \ | |
369 | struct thermal_zone_device *tz = to_thermal_zone(dev); \ | |
370 | s32 value; \ | |
371 | \ | |
372 | if (!tz->tzp) \ | |
373 | return -EIO; \ | |
374 | \ | |
375 | if (kstrtos32(buf, 10, &value)) \ | |
376 | return -EINVAL; \ | |
377 | \ | |
378 | tz->tzp->name = value; \ | |
379 | \ | |
380 | return count; \ | |
381 | } \ | |
e76a4386 | 382 | static DEVICE_ATTR_RW(name) |
a369ee88 EV |
383 | |
384 | create_s32_tzp_attr(k_po); | |
385 | create_s32_tzp_attr(k_pu); | |
386 | create_s32_tzp_attr(k_i); | |
387 | create_s32_tzp_attr(k_d); | |
388 | create_s32_tzp_attr(integral_cutoff); | |
389 | create_s32_tzp_attr(slope); | |
390 | create_s32_tzp_attr(offset); | |
391 | #undef create_s32_tzp_attr | |
392 | ||
393 | /* | |
394 | * These are thermal zone device attributes that will always be present. | |
395 | * All the attributes created for tzp (create_s32_tzp_attr) also are always | |
396 | * present on the sysfs interface. | |
397 | */ | |
c828a892 JP |
398 | static DEVICE_ATTR_RO(type); |
399 | static DEVICE_ATTR_RO(temp); | |
b6b996b6 | 400 | static DEVICE_ATTR_RW(policy); |
c828a892 | 401 | static DEVICE_ATTR_RO(available_policies); |
b6b996b6 | 402 | static DEVICE_ATTR_RW(sustainable_power); |
a369ee88 EV |
403 | |
404 | /* These thermal zone device attributes are created based on conditions */ | |
b6b996b6 JP |
405 | static DEVICE_ATTR_RW(mode); |
406 | static DEVICE_ATTR_RW(passive); | |
a369ee88 EV |
407 | |
408 | /* These attributes are unconditionally added to a thermal zone */ | |
409 | static struct attribute *thermal_zone_dev_attrs[] = { | |
410 | &dev_attr_type.attr, | |
411 | &dev_attr_temp.attr, | |
412 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) | |
413 | &dev_attr_emul_temp.attr, | |
414 | #endif | |
415 | &dev_attr_policy.attr, | |
416 | &dev_attr_available_policies.attr, | |
417 | &dev_attr_sustainable_power.attr, | |
418 | &dev_attr_k_po.attr, | |
419 | &dev_attr_k_pu.attr, | |
420 | &dev_attr_k_i.attr, | |
421 | &dev_attr_k_d.attr, | |
422 | &dev_attr_integral_cutoff.attr, | |
423 | &dev_attr_slope.attr, | |
424 | &dev_attr_offset.attr, | |
425 | NULL, | |
426 | }; | |
427 | ||
f74bed6a | 428 | static const struct attribute_group thermal_zone_attribute_group = { |
a369ee88 EV |
429 | .attrs = thermal_zone_dev_attrs, |
430 | }; | |
431 | ||
a369ee88 EV |
432 | static struct attribute *thermal_zone_mode_attrs[] = { |
433 | &dev_attr_mode.attr, | |
434 | NULL, | |
435 | }; | |
436 | ||
f74bed6a | 437 | static const struct attribute_group thermal_zone_mode_attribute_group = { |
a369ee88 | 438 | .attrs = thermal_zone_mode_attrs, |
a369ee88 EV |
439 | }; |
440 | ||
441 | /* We expose passive only if passive trips are present */ | |
442 | static struct attribute *thermal_zone_passive_attrs[] = { | |
443 | &dev_attr_passive.attr, | |
444 | NULL, | |
445 | }; | |
446 | ||
447 | static umode_t thermal_zone_passive_is_visible(struct kobject *kobj, | |
448 | struct attribute *attr, | |
449 | int attrno) | |
450 | { | |
6ad1c515 | 451 | struct device *dev = kobj_to_dev(kobj); |
a369ee88 EV |
452 | struct thermal_zone_device *tz; |
453 | enum thermal_trip_type trip_type; | |
454 | int count, passive = 0; | |
455 | ||
456 | tz = container_of(dev, struct thermal_zone_device, device); | |
457 | ||
458 | for (count = 0; count < tz->trips && !passive; count++) { | |
459 | tz->ops->get_trip_type(tz, count, &trip_type); | |
460 | ||
461 | if (trip_type == THERMAL_TRIP_PASSIVE) | |
462 | passive = 1; | |
463 | } | |
464 | ||
465 | if (!passive) | |
466 | return attr->mode; | |
467 | ||
468 | return 0; | |
469 | } | |
470 | ||
f74bed6a | 471 | static const struct attribute_group thermal_zone_passive_attribute_group = { |
a369ee88 EV |
472 | .attrs = thermal_zone_passive_attrs, |
473 | .is_visible = thermal_zone_passive_is_visible, | |
474 | }; | |
475 | ||
476 | static const struct attribute_group *thermal_zone_attribute_groups[] = { | |
477 | &thermal_zone_attribute_group, | |
478 | &thermal_zone_mode_attribute_group, | |
479 | &thermal_zone_passive_attribute_group, | |
480 | /* This is not NULL terminated as we create the group dynamically */ | |
481 | }; | |
482 | ||
483 | /** | |
484 | * create_trip_attrs() - create attributes for trip points | |
485 | * @tz: the thermal zone device | |
486 | * @mask: Writeable trip point bitmap. | |
487 | * | |
488 | * helper function to instantiate sysfs entries for every trip | |
489 | * point and its properties of a struct thermal_zone_device. | |
490 | * | |
491 | * Return: 0 on success, the proper error value otherwise. | |
492 | */ | |
493 | static int create_trip_attrs(struct thermal_zone_device *tz, int mask) | |
494 | { | |
a369ee88 EV |
495 | struct attribute **attrs; |
496 | int indx; | |
497 | ||
498 | /* This function works only for zones with at least one trip */ | |
499 | if (tz->trips <= 0) | |
500 | return -EINVAL; | |
501 | ||
b819dc9e EV |
502 | tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs), |
503 | GFP_KERNEL); | |
a369ee88 EV |
504 | if (!tz->trip_type_attrs) |
505 | return -ENOMEM; | |
506 | ||
b819dc9e EV |
507 | tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs), |
508 | GFP_KERNEL); | |
a369ee88 EV |
509 | if (!tz->trip_temp_attrs) { |
510 | kfree(tz->trip_type_attrs); | |
511 | return -ENOMEM; | |
512 | } | |
513 | ||
514 | if (tz->ops->get_trip_hyst) { | |
b819dc9e EV |
515 | tz->trip_hyst_attrs = kcalloc(tz->trips, |
516 | sizeof(*tz->trip_hyst_attrs), | |
517 | GFP_KERNEL); | |
a369ee88 EV |
518 | if (!tz->trip_hyst_attrs) { |
519 | kfree(tz->trip_type_attrs); | |
520 | kfree(tz->trip_temp_attrs); | |
521 | return -ENOMEM; | |
522 | } | |
523 | } | |
524 | ||
b819dc9e | 525 | attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL); |
a369ee88 EV |
526 | if (!attrs) { |
527 | kfree(tz->trip_type_attrs); | |
528 | kfree(tz->trip_temp_attrs); | |
529 | if (tz->ops->get_trip_hyst) | |
530 | kfree(tz->trip_hyst_attrs); | |
531 | return -ENOMEM; | |
532 | } | |
533 | ||
534 | for (indx = 0; indx < tz->trips; indx++) { | |
535 | /* create trip type attribute */ | |
536 | snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, | |
537 | "trip_point_%d_type", indx); | |
538 | ||
539 | sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); | |
540 | tz->trip_type_attrs[indx].attr.attr.name = | |
541 | tz->trip_type_attrs[indx].name; | |
542 | tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; | |
543 | tz->trip_type_attrs[indx].attr.show = trip_point_type_show; | |
544 | attrs[indx] = &tz->trip_type_attrs[indx].attr.attr; | |
545 | ||
546 | /* create trip temp attribute */ | |
547 | snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH, | |
548 | "trip_point_%d_temp", indx); | |
549 | ||
550 | sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr); | |
551 | tz->trip_temp_attrs[indx].attr.attr.name = | |
552 | tz->trip_temp_attrs[indx].name; | |
553 | tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO; | |
554 | tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show; | |
555 | if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) && | |
556 | mask & (1 << indx)) { | |
557 | tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; | |
558 | tz->trip_temp_attrs[indx].attr.store = | |
559 | trip_point_temp_store; | |
560 | } | |
561 | attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr; | |
562 | ||
563 | /* create Optional trip hyst attribute */ | |
564 | if (!tz->ops->get_trip_hyst) | |
565 | continue; | |
566 | snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH, | |
567 | "trip_point_%d_hyst", indx); | |
568 | ||
569 | sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr); | |
570 | tz->trip_hyst_attrs[indx].attr.attr.name = | |
571 | tz->trip_hyst_attrs[indx].name; | |
572 | tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO; | |
573 | tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show; | |
574 | if (tz->ops->set_trip_hyst) { | |
575 | tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR; | |
576 | tz->trip_hyst_attrs[indx].attr.store = | |
577 | trip_point_hyst_store; | |
578 | } | |
579 | attrs[indx + tz->trips * 2] = | |
580 | &tz->trip_hyst_attrs[indx].attr.attr; | |
581 | } | |
582 | attrs[tz->trips * 3] = NULL; | |
583 | ||
584 | tz->trips_attribute_group.attrs = attrs; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | ||
32fa5ba3 CJ |
589 | /** |
590 | * destroy_trip_attrs() - destroy attributes for trip points | |
591 | * @tz: the thermal zone device | |
592 | * | |
593 | * helper function to free resources allocated by create_trip_attrs() | |
594 | */ | |
595 | static void destroy_trip_attrs(struct thermal_zone_device *tz) | |
596 | { | |
597 | if (!tz) | |
598 | return; | |
599 | ||
600 | kfree(tz->trip_type_attrs); | |
601 | kfree(tz->trip_temp_attrs); | |
602 | if (tz->ops->get_trip_hyst) | |
603 | kfree(tz->trip_hyst_attrs); | |
604 | kfree(tz->trips_attribute_group.attrs); | |
605 | } | |
606 | ||
a369ee88 EV |
607 | int thermal_zone_create_device_groups(struct thermal_zone_device *tz, |
608 | int mask) | |
609 | { | |
610 | const struct attribute_group **groups; | |
611 | int i, size, result; | |
612 | ||
613 | /* we need one extra for trips and the NULL to terminate the array */ | |
614 | size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2; | |
615 | /* This also takes care of API requirement to be NULL terminated */ | |
616 | groups = kcalloc(size, sizeof(*groups), GFP_KERNEL); | |
617 | if (!groups) | |
618 | return -ENOMEM; | |
619 | ||
620 | for (i = 0; i < size - 2; i++) | |
621 | groups[i] = thermal_zone_attribute_groups[i]; | |
622 | ||
623 | if (tz->trips) { | |
624 | result = create_trip_attrs(tz, mask); | |
625 | if (result) { | |
626 | kfree(groups); | |
627 | ||
628 | return result; | |
629 | } | |
630 | ||
631 | groups[size - 2] = &tz->trips_attribute_group; | |
632 | } | |
633 | ||
634 | tz->device.groups = groups; | |
635 | ||
636 | return 0; | |
637 | } | |
45cf2ec9 | 638 | |
32fa5ba3 CJ |
639 | void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz) |
640 | { | |
641 | if (!tz) | |
642 | return; | |
643 | ||
644 | if (tz->trips) | |
645 | destroy_trip_attrs(tz); | |
646 | ||
647 | kfree(tz->device.groups); | |
648 | } | |
649 | ||
45cf2ec9 EV |
650 | /* sys I/F for cooling device */ |
651 | static ssize_t | |
33e678d4 | 652 | cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
653 | { |
654 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
655 | ||
656 | return sprintf(buf, "%s\n", cdev->type); | |
657 | } | |
658 | ||
33e678d4 VK |
659 | static ssize_t max_state_show(struct device *dev, struct device_attribute *attr, |
660 | char *buf) | |
45cf2ec9 EV |
661 | { |
662 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
663 | unsigned long state; | |
664 | int ret; | |
665 | ||
666 | ret = cdev->ops->get_max_state(cdev, &state); | |
667 | if (ret) | |
668 | return ret; | |
669 | return sprintf(buf, "%ld\n", state); | |
670 | } | |
671 | ||
33e678d4 VK |
672 | static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr, |
673 | char *buf) | |
45cf2ec9 EV |
674 | { |
675 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
676 | unsigned long state; | |
677 | int ret; | |
678 | ||
679 | ret = cdev->ops->get_cur_state(cdev, &state); | |
680 | if (ret) | |
681 | return ret; | |
682 | return sprintf(buf, "%ld\n", state); | |
683 | } | |
684 | ||
685 | static ssize_t | |
33e678d4 VK |
686 | cur_state_store(struct device *dev, struct device_attribute *attr, |
687 | const char *buf, size_t count) | |
45cf2ec9 EV |
688 | { |
689 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
690 | unsigned long state; | |
691 | int result; | |
692 | ||
693 | if (sscanf(buf, "%ld\n", &state) != 1) | |
694 | return -EINVAL; | |
695 | ||
696 | if ((long)state < 0) | |
697 | return -EINVAL; | |
698 | ||
68000a0d TG |
699 | mutex_lock(&cdev->lock); |
700 | ||
45cf2ec9 | 701 | result = cdev->ops->set_cur_state(cdev, state); |
68000a0d TG |
702 | if (!result) |
703 | thermal_cooling_device_stats_update(cdev, state); | |
704 | ||
705 | mutex_unlock(&cdev->lock); | |
706 | return result ? result : count; | |
45cf2ec9 EV |
707 | } |
708 | ||
33e678d4 VK |
709 | static struct device_attribute |
710 | dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL); | |
e76a4386 VK |
711 | static DEVICE_ATTR_RO(max_state); |
712 | static DEVICE_ATTR_RW(cur_state); | |
45cf2ec9 EV |
713 | |
714 | static struct attribute *cooling_device_attrs[] = { | |
715 | &dev_attr_cdev_type.attr, | |
716 | &dev_attr_max_state.attr, | |
717 | &dev_attr_cur_state.attr, | |
718 | NULL, | |
719 | }; | |
720 | ||
721 | static const struct attribute_group cooling_device_attr_group = { | |
722 | .attrs = cooling_device_attrs, | |
723 | }; | |
724 | ||
725 | static const struct attribute_group *cooling_device_attr_groups[] = { | |
726 | &cooling_device_attr_group, | |
8ea22951 | 727 | NULL, /* Space allocated for cooling_device_stats_attr_group */ |
45cf2ec9 EV |
728 | NULL, |
729 | }; | |
730 | ||
8ea22951 VK |
731 | #ifdef CONFIG_THERMAL_STATISTICS |
732 | struct cooling_dev_stats { | |
733 | spinlock_t lock; | |
734 | unsigned int total_trans; | |
735 | unsigned long state; | |
736 | unsigned long max_states; | |
737 | ktime_t last_time; | |
738 | ktime_t *time_in_state; | |
739 | unsigned int *trans_table; | |
740 | }; | |
741 | ||
742 | static void update_time_in_state(struct cooling_dev_stats *stats) | |
743 | { | |
744 | ktime_t now = ktime_get(), delta; | |
745 | ||
746 | delta = ktime_sub(now, stats->last_time); | |
747 | stats->time_in_state[stats->state] = | |
748 | ktime_add(stats->time_in_state[stats->state], delta); | |
749 | stats->last_time = now; | |
750 | } | |
751 | ||
752 | void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev, | |
753 | unsigned long new_state) | |
754 | { | |
755 | struct cooling_dev_stats *stats = cdev->stats; | |
756 | ||
6952728d MMP |
757 | if (!stats) |
758 | return; | |
759 | ||
8ea22951 VK |
760 | spin_lock(&stats->lock); |
761 | ||
762 | if (stats->state == new_state) | |
763 | goto unlock; | |
764 | ||
765 | update_time_in_state(stats); | |
766 | stats->trans_table[stats->state * stats->max_states + new_state]++; | |
767 | stats->state = new_state; | |
768 | stats->total_trans++; | |
769 | ||
770 | unlock: | |
771 | spin_unlock(&stats->lock); | |
772 | } | |
773 | ||
33e678d4 VK |
774 | static ssize_t total_trans_show(struct device *dev, |
775 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
776 | { |
777 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
778 | struct cooling_dev_stats *stats = cdev->stats; | |
779 | int ret; | |
780 | ||
781 | spin_lock(&stats->lock); | |
782 | ret = sprintf(buf, "%u\n", stats->total_trans); | |
783 | spin_unlock(&stats->lock); | |
784 | ||
785 | return ret; | |
786 | } | |
787 | ||
788 | static ssize_t | |
33e678d4 VK |
789 | time_in_state_ms_show(struct device *dev, struct device_attribute *attr, |
790 | char *buf) | |
8ea22951 VK |
791 | { |
792 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
793 | struct cooling_dev_stats *stats = cdev->stats; | |
794 | ssize_t len = 0; | |
795 | int i; | |
796 | ||
797 | spin_lock(&stats->lock); | |
798 | update_time_in_state(stats); | |
799 | ||
800 | for (i = 0; i < stats->max_states; i++) { | |
801 | len += sprintf(buf + len, "state%u\t%llu\n", i, | |
802 | ktime_to_ms(stats->time_in_state[i])); | |
803 | } | |
804 | spin_unlock(&stats->lock); | |
805 | ||
806 | return len; | |
807 | } | |
808 | ||
809 | static ssize_t | |
33e678d4 VK |
810 | reset_store(struct device *dev, struct device_attribute *attr, const char *buf, |
811 | size_t count) | |
8ea22951 VK |
812 | { |
813 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
814 | struct cooling_dev_stats *stats = cdev->stats; | |
815 | int i, states = stats->max_states; | |
816 | ||
817 | spin_lock(&stats->lock); | |
818 | ||
819 | stats->total_trans = 0; | |
820 | stats->last_time = ktime_get(); | |
821 | memset(stats->trans_table, 0, | |
822 | states * states * sizeof(*stats->trans_table)); | |
823 | ||
824 | for (i = 0; i < stats->max_states; i++) | |
825 | stats->time_in_state[i] = ktime_set(0, 0); | |
826 | ||
827 | spin_unlock(&stats->lock); | |
828 | ||
829 | return count; | |
830 | } | |
831 | ||
33e678d4 VK |
832 | static ssize_t trans_table_show(struct device *dev, |
833 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
834 | { |
835 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
836 | struct cooling_dev_stats *stats = cdev->stats; | |
837 | ssize_t len = 0; | |
838 | int i, j; | |
839 | ||
840 | len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); | |
841 | len += snprintf(buf + len, PAGE_SIZE - len, " : "); | |
842 | for (i = 0; i < stats->max_states; i++) { | |
843 | if (len >= PAGE_SIZE) | |
844 | break; | |
845 | len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i); | |
846 | } | |
847 | if (len >= PAGE_SIZE) | |
848 | return PAGE_SIZE; | |
849 | ||
850 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
851 | ||
852 | for (i = 0; i < stats->max_states; i++) { | |
853 | if (len >= PAGE_SIZE) | |
854 | break; | |
855 | ||
856 | len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i); | |
857 | ||
858 | for (j = 0; j < stats->max_states; j++) { | |
859 | if (len >= PAGE_SIZE) | |
860 | break; | |
861 | len += snprintf(buf + len, PAGE_SIZE - len, "%8u ", | |
862 | stats->trans_table[i * stats->max_states + j]); | |
863 | } | |
864 | if (len >= PAGE_SIZE) | |
865 | break; | |
866 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
867 | } | |
868 | ||
869 | if (len >= PAGE_SIZE) { | |
870 | pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n"); | |
871 | return -EFBIG; | |
872 | } | |
873 | return len; | |
874 | } | |
875 | ||
e76a4386 VK |
876 | static DEVICE_ATTR_RO(total_trans); |
877 | static DEVICE_ATTR_RO(time_in_state_ms); | |
878 | static DEVICE_ATTR_WO(reset); | |
879 | static DEVICE_ATTR_RO(trans_table); | |
8ea22951 VK |
880 | |
881 | static struct attribute *cooling_device_stats_attrs[] = { | |
882 | &dev_attr_total_trans.attr, | |
883 | &dev_attr_time_in_state_ms.attr, | |
884 | &dev_attr_reset.attr, | |
885 | &dev_attr_trans_table.attr, | |
886 | NULL | |
887 | }; | |
888 | ||
889 | static const struct attribute_group cooling_device_stats_attr_group = { | |
890 | .attrs = cooling_device_stats_attrs, | |
891 | .name = "stats" | |
892 | }; | |
893 | ||
894 | static void cooling_device_stats_setup(struct thermal_cooling_device *cdev) | |
895 | { | |
896 | struct cooling_dev_stats *stats; | |
897 | unsigned long states; | |
898 | int var; | |
899 | ||
900 | if (cdev->ops->get_max_state(cdev, &states)) | |
901 | return; | |
902 | ||
903 | states++; /* Total number of states is highest state + 1 */ | |
904 | ||
905 | var = sizeof(*stats); | |
906 | var += sizeof(*stats->time_in_state) * states; | |
907 | var += sizeof(*stats->trans_table) * states * states; | |
908 | ||
909 | stats = kzalloc(var, GFP_KERNEL); | |
910 | if (!stats) | |
911 | return; | |
912 | ||
913 | stats->time_in_state = (ktime_t *)(stats + 1); | |
914 | stats->trans_table = (unsigned int *)(stats->time_in_state + states); | |
915 | cdev->stats = stats; | |
916 | stats->last_time = ktime_get(); | |
917 | stats->max_states = states; | |
918 | ||
919 | spin_lock_init(&stats->lock); | |
920 | ||
921 | /* Fill the empty slot left in cooling_device_attr_groups */ | |
922 | var = ARRAY_SIZE(cooling_device_attr_groups) - 2; | |
923 | cooling_device_attr_groups[var] = &cooling_device_stats_attr_group; | |
924 | } | |
925 | ||
926 | static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev) | |
927 | { | |
928 | kfree(cdev->stats); | |
929 | cdev->stats = NULL; | |
930 | } | |
931 | ||
932 | #else | |
933 | ||
934 | static inline void | |
935 | cooling_device_stats_setup(struct thermal_cooling_device *cdev) {} | |
936 | static inline void | |
937 | cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {} | |
938 | ||
939 | #endif /* CONFIG_THERMAL_STATISTICS */ | |
940 | ||
45cf2ec9 EV |
941 | void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev) |
942 | { | |
8ea22951 | 943 | cooling_device_stats_setup(cdev); |
45cf2ec9 EV |
944 | cdev->device.groups = cooling_device_attr_groups; |
945 | } | |
946 | ||
8ea22951 VK |
947 | void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev) |
948 | { | |
949 | cooling_device_stats_destroy(cdev); | |
950 | } | |
951 | ||
45cf2ec9 EV |
952 | /* these helper will be used only at the time of bindig */ |
953 | ssize_t | |
33e678d4 | 954 | trip_point_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
955 | { |
956 | struct thermal_instance *instance; | |
957 | ||
958 | instance = | |
959 | container_of(attr, struct thermal_instance, attr); | |
960 | ||
961 | if (instance->trip == THERMAL_TRIPS_NONE) | |
962 | return sprintf(buf, "-1\n"); | |
963 | else | |
964 | return sprintf(buf, "%d\n", instance->trip); | |
965 | } | |
966 | ||
967 | ssize_t | |
33e678d4 | 968 | weight_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
969 | { |
970 | struct thermal_instance *instance; | |
971 | ||
972 | instance = container_of(attr, struct thermal_instance, weight_attr); | |
973 | ||
974 | return sprintf(buf, "%d\n", instance->weight); | |
975 | } | |
976 | ||
33e678d4 VK |
977 | ssize_t weight_store(struct device *dev, struct device_attribute *attr, |
978 | const char *buf, size_t count) | |
45cf2ec9 EV |
979 | { |
980 | struct thermal_instance *instance; | |
981 | int ret, weight; | |
982 | ||
983 | ret = kstrtoint(buf, 0, &weight); | |
984 | if (ret) | |
985 | return ret; | |
986 | ||
987 | instance = container_of(attr, struct thermal_instance, weight_attr); | |
988 | instance->weight = weight; | |
989 | ||
990 | return count; | |
991 | } |