Commit | Line | Data |
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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 | ||
a369ee88 EV |
219 | static ssize_t |
220 | policy_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 | ||
236 | static ssize_t | |
237 | policy_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 | ||
244 | static ssize_t | |
245 | available_policies_show(struct device *dev, struct device_attribute *devattr, | |
246 | char *buf) | |
247 | { | |
248 | return thermal_build_list_of_policies(buf); | |
249 | } | |
250 | ||
698db4fd | 251 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) |
a369ee88 EV |
252 | static ssize_t |
253 | emul_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 | } | |
6cbaefb4 | 276 | static DEVICE_ATTR_WO(emul_temp); |
698db4fd | 277 | #endif |
a369ee88 EV |
278 | |
279 | static ssize_t | |
280 | sustainable_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 | ||
291 | static ssize_t | |
292 | sustainable_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 | } \ | |
e76a4386 | 339 | static DEVICE_ATTR_RW(name) |
a369ee88 EV |
340 | |
341 | create_s32_tzp_attr(k_po); | |
342 | create_s32_tzp_attr(k_pu); | |
343 | create_s32_tzp_attr(k_i); | |
344 | create_s32_tzp_attr(k_d); | |
345 | create_s32_tzp_attr(integral_cutoff); | |
346 | create_s32_tzp_attr(slope); | |
347 | create_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 | */ | |
c828a892 JP |
355 | static DEVICE_ATTR_RO(type); |
356 | static DEVICE_ATTR_RO(temp); | |
b6b996b6 | 357 | static DEVICE_ATTR_RW(policy); |
c828a892 | 358 | static DEVICE_ATTR_RO(available_policies); |
b6b996b6 | 359 | static DEVICE_ATTR_RW(sustainable_power); |
a369ee88 EV |
360 | |
361 | /* These thermal zone device attributes are created based on conditions */ | |
b6b996b6 | 362 | static DEVICE_ATTR_RW(mode); |
a369ee88 EV |
363 | |
364 | /* These attributes are unconditionally added to a thermal zone */ | |
365 | static 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 | ||
f74bed6a | 384 | static const struct attribute_group thermal_zone_attribute_group = { |
a369ee88 EV |
385 | .attrs = thermal_zone_dev_attrs, |
386 | }; | |
387 | ||
a369ee88 EV |
388 | static struct attribute *thermal_zone_mode_attrs[] = { |
389 | &dev_attr_mode.attr, | |
390 | NULL, | |
391 | }; | |
392 | ||
f74bed6a | 393 | static const struct attribute_group thermal_zone_mode_attribute_group = { |
a369ee88 | 394 | .attrs = thermal_zone_mode_attrs, |
a369ee88 EV |
395 | }; |
396 | ||
a369ee88 EV |
397 | static const struct attribute_group *thermal_zone_attribute_groups[] = { |
398 | &thermal_zone_attribute_group, | |
399 | &thermal_zone_mode_attribute_group, | |
a369ee88 EV |
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 | */ | |
413 | static int create_trip_attrs(struct thermal_zone_device *tz, int mask) | |
414 | { | |
a369ee88 EV |
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 | ||
b819dc9e EV |
422 | tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs), |
423 | GFP_KERNEL); | |
a369ee88 EV |
424 | if (!tz->trip_type_attrs) |
425 | return -ENOMEM; | |
426 | ||
b819dc9e EV |
427 | tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs), |
428 | GFP_KERNEL); | |
a369ee88 EV |
429 | if (!tz->trip_temp_attrs) { |
430 | kfree(tz->trip_type_attrs); | |
431 | return -ENOMEM; | |
432 | } | |
433 | ||
434 | if (tz->ops->get_trip_hyst) { | |
b819dc9e EV |
435 | tz->trip_hyst_attrs = kcalloc(tz->trips, |
436 | sizeof(*tz->trip_hyst_attrs), | |
437 | GFP_KERNEL); | |
a369ee88 EV |
438 | if (!tz->trip_hyst_attrs) { |
439 | kfree(tz->trip_type_attrs); | |
440 | kfree(tz->trip_temp_attrs); | |
441 | return -ENOMEM; | |
442 | } | |
443 | } | |
444 | ||
b819dc9e | 445 | attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL); |
a369ee88 EV |
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 | ||
32fa5ba3 CJ |
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 | */ | |
515 | static 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 | ||
a369ee88 EV |
527 | int 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 | } | |
45cf2ec9 | 558 | |
32fa5ba3 CJ |
559 | void 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 | ||
45cf2ec9 EV |
570 | /* sys I/F for cooling device */ |
571 | static ssize_t | |
33e678d4 | 572 | cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
573 | { |
574 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
575 | ||
576 | return sprintf(buf, "%s\n", cdev->type); | |
577 | } | |
578 | ||
33e678d4 VK |
579 | static ssize_t max_state_show(struct device *dev, struct device_attribute *attr, |
580 | char *buf) | |
45cf2ec9 EV |
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 | ||
33e678d4 VK |
592 | static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr, |
593 | char *buf) | |
45cf2ec9 EV |
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 | ||
605 | static ssize_t | |
33e678d4 VK |
606 | cur_state_store(struct device *dev, struct device_attribute *attr, |
607 | const char *buf, size_t count) | |
45cf2ec9 EV |
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 | ||
68000a0d TG |
619 | mutex_lock(&cdev->lock); |
620 | ||
45cf2ec9 | 621 | result = cdev->ops->set_cur_state(cdev, state); |
68000a0d TG |
622 | if (!result) |
623 | thermal_cooling_device_stats_update(cdev, state); | |
624 | ||
625 | mutex_unlock(&cdev->lock); | |
626 | return result ? result : count; | |
45cf2ec9 EV |
627 | } |
628 | ||
33e678d4 VK |
629 | static struct device_attribute |
630 | dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL); | |
e76a4386 VK |
631 | static DEVICE_ATTR_RO(max_state); |
632 | static DEVICE_ATTR_RW(cur_state); | |
45cf2ec9 EV |
633 | |
634 | static 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 | ||
641 | static const struct attribute_group cooling_device_attr_group = { | |
642 | .attrs = cooling_device_attrs, | |
643 | }; | |
644 | ||
645 | static const struct attribute_group *cooling_device_attr_groups[] = { | |
646 | &cooling_device_attr_group, | |
8ea22951 | 647 | NULL, /* Space allocated for cooling_device_stats_attr_group */ |
45cf2ec9 EV |
648 | NULL, |
649 | }; | |
650 | ||
8ea22951 VK |
651 | #ifdef CONFIG_THERMAL_STATISTICS |
652 | struct 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 | ||
662 | static 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 | ||
672 | void 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 | ||
2046a24a MMP |
677 | if (!stats) |
678 | return; | |
679 | ||
8ea22951 VK |
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 | ||
690 | unlock: | |
691 | spin_unlock(&stats->lock); | |
692 | } | |
693 | ||
33e678d4 VK |
694 | static ssize_t total_trans_show(struct device *dev, |
695 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
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 | ||
708 | static ssize_t | |
33e678d4 VK |
709 | time_in_state_ms_show(struct device *dev, struct device_attribute *attr, |
710 | char *buf) | |
8ea22951 VK |
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 | ||
729 | static ssize_t | |
33e678d4 VK |
730 | reset_store(struct device *dev, struct device_attribute *attr, const char *buf, |
731 | size_t count) | |
8ea22951 VK |
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 | ||
33e678d4 VK |
752 | static ssize_t trans_table_show(struct device *dev, |
753 | struct device_attribute *attr, char *buf) | |
8ea22951 VK |
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 | ||
e76a4386 VK |
796 | static DEVICE_ATTR_RO(total_trans); |
797 | static DEVICE_ATTR_RO(time_in_state_ms); | |
798 | static DEVICE_ATTR_WO(reset); | |
799 | static DEVICE_ATTR_RO(trans_table); | |
8ea22951 VK |
800 | |
801 | static 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 | ||
809 | static const struct attribute_group cooling_device_stats_attr_group = { | |
810 | .attrs = cooling_device_stats_attrs, | |
811 | .name = "stats" | |
812 | }; | |
813 | ||
814 | static 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 | ||
846 | static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev) | |
847 | { | |
848 | kfree(cdev->stats); | |
849 | cdev->stats = NULL; | |
850 | } | |
851 | ||
852 | #else | |
853 | ||
854 | static inline void | |
855 | cooling_device_stats_setup(struct thermal_cooling_device *cdev) {} | |
856 | static inline void | |
857 | cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {} | |
858 | ||
859 | #endif /* CONFIG_THERMAL_STATISTICS */ | |
860 | ||
45cf2ec9 EV |
861 | void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev) |
862 | { | |
8ea22951 | 863 | cooling_device_stats_setup(cdev); |
45cf2ec9 EV |
864 | cdev->device.groups = cooling_device_attr_groups; |
865 | } | |
866 | ||
8ea22951 VK |
867 | void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev) |
868 | { | |
869 | cooling_device_stats_destroy(cdev); | |
870 | } | |
871 | ||
45cf2ec9 EV |
872 | /* these helper will be used only at the time of bindig */ |
873 | ssize_t | |
33e678d4 | 874 | trip_point_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
875 | { |
876 | struct thermal_instance *instance; | |
877 | ||
878 | instance = | |
879 | container_of(attr, struct thermal_instance, attr); | |
880 | ||
53f04ca8 | 881 | return sprintf(buf, "%d\n", instance->trip); |
45cf2ec9 EV |
882 | } |
883 | ||
884 | ssize_t | |
33e678d4 | 885 | weight_show(struct device *dev, struct device_attribute *attr, char *buf) |
45cf2ec9 EV |
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 | ||
33e678d4 VK |
894 | ssize_t weight_store(struct device *dev, struct device_attribute *attr, |
895 | const char *buf, size_t count) | |
45cf2ec9 EV |
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 | } |