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a369ee88 EV |
1 | /* |
2 | * thermal.c - sysfs interface of thermal devices | |
3 | * | |
4 | * Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com> | |
5 | * | |
6 | * Highly based on original thermal_core.c | |
7 | * Copyright (C) 2008 Intel Corp | |
8 | * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> | |
9 | * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; version 2 of the License. | |
14 | */ | |
15 | ||
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
17 | ||
18 | #include <linux/sysfs.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/string.h> | |
23 | ||
24 | #include "thermal_core.h" | |
25 | ||
26 | /* sys I/F for thermal zone */ | |
27 | ||
28 | static ssize_t | |
29 | type_show(struct device *dev, struct device_attribute *attr, char *buf) | |
30 | { | |
31 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
32 | ||
33 | return sprintf(buf, "%s\n", tz->type); | |
34 | } | |
35 | ||
36 | static ssize_t | |
37 | temp_show(struct device *dev, struct device_attribute *attr, char *buf) | |
38 | { | |
39 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
40 | int temperature, ret; | |
41 | ||
42 | ret = thermal_zone_get_temp(tz, &temperature); | |
43 | ||
44 | if (ret) | |
45 | return ret; | |
46 | ||
47 | return sprintf(buf, "%d\n", temperature); | |
48 | } | |
49 | ||
50 | static ssize_t | |
51 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) | |
52 | { | |
53 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
54 | enum thermal_device_mode mode; | |
55 | int result; | |
56 | ||
57 | if (!tz->ops->get_mode) | |
58 | return -EPERM; | |
59 | ||
60 | result = tz->ops->get_mode(tz, &mode); | |
61 | if (result) | |
62 | return result; | |
63 | ||
64 | return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled" | |
65 | : "disabled"); | |
66 | } | |
67 | ||
68 | static ssize_t | |
69 | mode_store(struct device *dev, struct device_attribute *attr, | |
70 | const char *buf, size_t count) | |
71 | { | |
72 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
73 | int result; | |
74 | ||
75 | if (!tz->ops->set_mode) | |
76 | return -EPERM; | |
77 | ||
78 | if (!strncmp(buf, "enabled", sizeof("enabled") - 1)) | |
79 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); | |
80 | else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) | |
81 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED); | |
82 | else | |
83 | result = -EINVAL; | |
84 | ||
85 | if (result) | |
86 | return result; | |
87 | ||
88 | return count; | |
89 | } | |
90 | ||
91 | static ssize_t | |
92 | trip_point_type_show(struct device *dev, struct device_attribute *attr, | |
93 | char *buf) | |
94 | { | |
95 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
96 | enum thermal_trip_type type; | |
97 | int trip, result; | |
98 | ||
99 | if (!tz->ops->get_trip_type) | |
100 | return -EPERM; | |
101 | ||
102 | if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1) | |
103 | return -EINVAL; | |
104 | ||
105 | result = tz->ops->get_trip_type(tz, trip, &type); | |
106 | if (result) | |
107 | return result; | |
108 | ||
109 | switch (type) { | |
110 | case THERMAL_TRIP_CRITICAL: | |
111 | return sprintf(buf, "critical\n"); | |
112 | case THERMAL_TRIP_HOT: | |
113 | return sprintf(buf, "hot\n"); | |
114 | case THERMAL_TRIP_PASSIVE: | |
115 | return sprintf(buf, "passive\n"); | |
116 | case THERMAL_TRIP_ACTIVE: | |
117 | return sprintf(buf, "active\n"); | |
118 | default: | |
119 | return sprintf(buf, "unknown\n"); | |
120 | } | |
121 | } | |
122 | ||
123 | static ssize_t | |
124 | trip_point_temp_store(struct device *dev, struct device_attribute *attr, | |
125 | const char *buf, size_t count) | |
126 | { | |
127 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
128 | int trip, ret; | |
129 | int temperature; | |
130 | ||
131 | if (!tz->ops->set_trip_temp) | |
132 | return -EPERM; | |
133 | ||
134 | if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1) | |
135 | return -EINVAL; | |
136 | ||
137 | if (kstrtoint(buf, 10, &temperature)) | |
138 | return -EINVAL; | |
139 | ||
140 | ret = tz->ops->set_trip_temp(tz, trip, temperature); | |
141 | if (ret) | |
142 | return ret; | |
143 | ||
144 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
145 | ||
146 | return count; | |
147 | } | |
148 | ||
149 | static ssize_t | |
150 | trip_point_temp_show(struct device *dev, struct device_attribute *attr, | |
151 | char *buf) | |
152 | { | |
153 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
154 | int trip, ret; | |
155 | int temperature; | |
156 | ||
157 | if (!tz->ops->get_trip_temp) | |
158 | return -EPERM; | |
159 | ||
160 | if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1) | |
161 | return -EINVAL; | |
162 | ||
163 | ret = tz->ops->get_trip_temp(tz, trip, &temperature); | |
164 | ||
165 | if (ret) | |
166 | return ret; | |
167 | ||
168 | return sprintf(buf, "%d\n", temperature); | |
169 | } | |
170 | ||
171 | static ssize_t | |
172 | trip_point_hyst_store(struct device *dev, struct device_attribute *attr, | |
173 | const char *buf, size_t count) | |
174 | { | |
175 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
176 | int trip, ret; | |
177 | int temperature; | |
178 | ||
179 | if (!tz->ops->set_trip_hyst) | |
180 | return -EPERM; | |
181 | ||
182 | if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1) | |
183 | return -EINVAL; | |
184 | ||
185 | if (kstrtoint(buf, 10, &temperature)) | |
186 | return -EINVAL; | |
187 | ||
188 | /* | |
189 | * We are not doing any check on the 'temperature' value | |
190 | * here. The driver implementing 'set_trip_hyst' has to | |
191 | * take care of this. | |
192 | */ | |
193 | ret = tz->ops->set_trip_hyst(tz, trip, temperature); | |
194 | ||
195 | if (!ret) | |
196 | thermal_zone_set_trips(tz); | |
197 | ||
198 | return ret ? ret : count; | |
199 | } | |
200 | ||
201 | static ssize_t | |
202 | trip_point_hyst_show(struct device *dev, struct device_attribute *attr, | |
203 | char *buf) | |
204 | { | |
205 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
206 | int trip, ret; | |
207 | int temperature; | |
208 | ||
209 | if (!tz->ops->get_trip_hyst) | |
210 | return -EPERM; | |
211 | ||
212 | if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1) | |
213 | return -EINVAL; | |
214 | ||
215 | ret = tz->ops->get_trip_hyst(tz, trip, &temperature); | |
216 | ||
217 | return ret ? ret : sprintf(buf, "%d\n", temperature); | |
218 | } | |
219 | ||
220 | static ssize_t | |
221 | passive_store(struct device *dev, struct device_attribute *attr, | |
222 | const char *buf, size_t count) | |
223 | { | |
224 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
225 | int state; | |
226 | ||
227 | if (sscanf(buf, "%d\n", &state) != 1) | |
228 | return -EINVAL; | |
229 | ||
230 | /* sanity check: values below 1000 millicelcius don't make sense | |
231 | * and can cause the system to go into a thermal heart attack | |
232 | */ | |
233 | if (state && state < 1000) | |
234 | return -EINVAL; | |
235 | ||
236 | if (state && !tz->forced_passive) { | |
237 | if (!tz->passive_delay) | |
238 | tz->passive_delay = 1000; | |
239 | thermal_zone_device_rebind_exception(tz, "Processor", | |
240 | sizeof("Processor")); | |
241 | } else if (!state && tz->forced_passive) { | |
242 | tz->passive_delay = 0; | |
243 | thermal_zone_device_unbind_exception(tz, "Processor", | |
244 | sizeof("Processor")); | |
245 | } | |
246 | ||
247 | tz->forced_passive = state; | |
248 | ||
249 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
250 | ||
251 | return count; | |
252 | } | |
253 | ||
254 | static ssize_t | |
255 | passive_show(struct device *dev, struct device_attribute *attr, | |
256 | char *buf) | |
257 | { | |
258 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
259 | ||
260 | return sprintf(buf, "%d\n", tz->forced_passive); | |
261 | } | |
262 | ||
263 | static ssize_t | |
264 | policy_store(struct device *dev, struct device_attribute *attr, | |
265 | const char *buf, size_t count) | |
266 | { | |
267 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
268 | char name[THERMAL_NAME_LENGTH]; | |
269 | int ret; | |
270 | ||
271 | snprintf(name, sizeof(name), "%s", buf); | |
272 | ||
273 | ret = thermal_zone_device_set_policy(tz, name); | |
274 | if (!ret) | |
275 | ret = count; | |
276 | ||
277 | return ret; | |
278 | } | |
279 | ||
280 | static ssize_t | |
281 | policy_show(struct device *dev, struct device_attribute *devattr, char *buf) | |
282 | { | |
283 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
284 | ||
285 | return sprintf(buf, "%s\n", tz->governor->name); | |
286 | } | |
287 | ||
288 | static ssize_t | |
289 | available_policies_show(struct device *dev, struct device_attribute *devattr, | |
290 | char *buf) | |
291 | { | |
292 | return thermal_build_list_of_policies(buf); | |
293 | } | |
294 | ||
698db4fd | 295 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) |
a369ee88 EV |
296 | static ssize_t |
297 | emul_temp_store(struct device *dev, struct device_attribute *attr, | |
298 | const char *buf, size_t count) | |
299 | { | |
300 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
301 | int ret = 0; | |
302 | int temperature; | |
303 | ||
304 | if (kstrtoint(buf, 10, &temperature)) | |
305 | return -EINVAL; | |
306 | ||
307 | if (!tz->ops->set_emul_temp) { | |
308 | mutex_lock(&tz->lock); | |
309 | tz->emul_temperature = temperature; | |
310 | mutex_unlock(&tz->lock); | |
311 | } else { | |
312 | ret = tz->ops->set_emul_temp(tz, temperature); | |
313 | } | |
314 | ||
315 | if (!ret) | |
316 | thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); | |
317 | ||
318 | return ret ? ret : count; | |
319 | } | |
698db4fd EV |
320 | static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store); |
321 | #endif | |
a369ee88 EV |
322 | |
323 | static ssize_t | |
324 | sustainable_power_show(struct device *dev, struct device_attribute *devattr, | |
325 | char *buf) | |
326 | { | |
327 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
328 | ||
329 | if (tz->tzp) | |
330 | return sprintf(buf, "%u\n", tz->tzp->sustainable_power); | |
331 | else | |
332 | return -EIO; | |
333 | } | |
334 | ||
335 | static ssize_t | |
336 | sustainable_power_store(struct device *dev, struct device_attribute *devattr, | |
337 | const char *buf, size_t count) | |
338 | { | |
339 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
340 | u32 sustainable_power; | |
341 | ||
342 | if (!tz->tzp) | |
343 | return -EIO; | |
344 | ||
345 | if (kstrtou32(buf, 10, &sustainable_power)) | |
346 | return -EINVAL; | |
347 | ||
348 | tz->tzp->sustainable_power = sustainable_power; | |
349 | ||
350 | return count; | |
351 | } | |
352 | ||
353 | #define create_s32_tzp_attr(name) \ | |
354 | static ssize_t \ | |
355 | name##_show(struct device *dev, struct device_attribute *devattr, \ | |
356 | char *buf) \ | |
357 | { \ | |
358 | struct thermal_zone_device *tz = to_thermal_zone(dev); \ | |
359 | \ | |
360 | if (tz->tzp) \ | |
361 | return sprintf(buf, "%d\n", tz->tzp->name); \ | |
362 | else \ | |
363 | return -EIO; \ | |
364 | } \ | |
365 | \ | |
366 | static ssize_t \ | |
367 | name##_store(struct device *dev, struct device_attribute *devattr, \ | |
368 | const char *buf, size_t count) \ | |
369 | { \ | |
370 | struct thermal_zone_device *tz = to_thermal_zone(dev); \ | |
371 | s32 value; \ | |
372 | \ | |
373 | if (!tz->tzp) \ | |
374 | return -EIO; \ | |
375 | \ | |
376 | if (kstrtos32(buf, 10, &value)) \ | |
377 | return -EINVAL; \ | |
378 | \ | |
379 | tz->tzp->name = value; \ | |
380 | \ | |
381 | return count; \ | |
382 | } \ | |
383 | static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store) | |
384 | ||
385 | create_s32_tzp_attr(k_po); | |
386 | create_s32_tzp_attr(k_pu); | |
387 | create_s32_tzp_attr(k_i); | |
388 | create_s32_tzp_attr(k_d); | |
389 | create_s32_tzp_attr(integral_cutoff); | |
390 | create_s32_tzp_attr(slope); | |
391 | create_s32_tzp_attr(offset); | |
392 | #undef create_s32_tzp_attr | |
393 | ||
394 | /* | |
395 | * These are thermal zone device attributes that will always be present. | |
396 | * All the attributes created for tzp (create_s32_tzp_attr) also are always | |
397 | * present on the sysfs interface. | |
398 | */ | |
399 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
400 | static DEVICE_ATTR(temp, 0444, temp_show, NULL); | |
a369ee88 EV |
401 | static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); |
402 | static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL); | |
403 | static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show, | |
404 | sustainable_power_store); | |
405 | ||
406 | /* These thermal zone device attributes are created based on conditions */ | |
407 | static DEVICE_ATTR(mode, 0644, mode_show, mode_store); | |
408 | static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); | |
409 | ||
410 | /* These attributes are unconditionally added to a thermal zone */ | |
411 | static struct attribute *thermal_zone_dev_attrs[] = { | |
412 | &dev_attr_type.attr, | |
413 | &dev_attr_temp.attr, | |
414 | #if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) | |
415 | &dev_attr_emul_temp.attr, | |
416 | #endif | |
417 | &dev_attr_policy.attr, | |
418 | &dev_attr_available_policies.attr, | |
419 | &dev_attr_sustainable_power.attr, | |
420 | &dev_attr_k_po.attr, | |
421 | &dev_attr_k_pu.attr, | |
422 | &dev_attr_k_i.attr, | |
423 | &dev_attr_k_d.attr, | |
424 | &dev_attr_integral_cutoff.attr, | |
425 | &dev_attr_slope.attr, | |
426 | &dev_attr_offset.attr, | |
427 | NULL, | |
428 | }; | |
429 | ||
430 | static struct attribute_group thermal_zone_attribute_group = { | |
431 | .attrs = thermal_zone_dev_attrs, | |
432 | }; | |
433 | ||
434 | /* We expose mode only if .get_mode is present */ | |
435 | static struct attribute *thermal_zone_mode_attrs[] = { | |
436 | &dev_attr_mode.attr, | |
437 | NULL, | |
438 | }; | |
439 | ||
440 | static umode_t thermal_zone_mode_is_visible(struct kobject *kobj, | |
441 | struct attribute *attr, | |
442 | int attrno) | |
443 | { | |
444 | struct device *dev = container_of(kobj, struct device, kobj); | |
445 | struct thermal_zone_device *tz; | |
446 | ||
447 | tz = container_of(dev, struct thermal_zone_device, device); | |
448 | ||
449 | if (tz->ops->get_mode) | |
450 | return attr->mode; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static struct attribute_group thermal_zone_mode_attribute_group = { | |
456 | .attrs = thermal_zone_mode_attrs, | |
457 | .is_visible = thermal_zone_mode_is_visible, | |
458 | }; | |
459 | ||
460 | /* We expose passive only if passive trips are present */ | |
461 | static struct attribute *thermal_zone_passive_attrs[] = { | |
462 | &dev_attr_passive.attr, | |
463 | NULL, | |
464 | }; | |
465 | ||
466 | static umode_t thermal_zone_passive_is_visible(struct kobject *kobj, | |
467 | struct attribute *attr, | |
468 | int attrno) | |
469 | { | |
470 | struct device *dev = container_of(kobj, struct device, kobj); | |
471 | struct thermal_zone_device *tz; | |
472 | enum thermal_trip_type trip_type; | |
473 | int count, passive = 0; | |
474 | ||
475 | tz = container_of(dev, struct thermal_zone_device, device); | |
476 | ||
477 | for (count = 0; count < tz->trips && !passive; count++) { | |
478 | tz->ops->get_trip_type(tz, count, &trip_type); | |
479 | ||
480 | if (trip_type == THERMAL_TRIP_PASSIVE) | |
481 | passive = 1; | |
482 | } | |
483 | ||
484 | if (!passive) | |
485 | return attr->mode; | |
486 | ||
487 | return 0; | |
488 | } | |
489 | ||
490 | static struct attribute_group thermal_zone_passive_attribute_group = { | |
491 | .attrs = thermal_zone_passive_attrs, | |
492 | .is_visible = thermal_zone_passive_is_visible, | |
493 | }; | |
494 | ||
495 | static const struct attribute_group *thermal_zone_attribute_groups[] = { | |
496 | &thermal_zone_attribute_group, | |
497 | &thermal_zone_mode_attribute_group, | |
498 | &thermal_zone_passive_attribute_group, | |
499 | /* This is not NULL terminated as we create the group dynamically */ | |
500 | }; | |
501 | ||
502 | /** | |
503 | * create_trip_attrs() - create attributes for trip points | |
504 | * @tz: the thermal zone device | |
505 | * @mask: Writeable trip point bitmap. | |
506 | * | |
507 | * helper function to instantiate sysfs entries for every trip | |
508 | * point and its properties of a struct thermal_zone_device. | |
509 | * | |
510 | * Return: 0 on success, the proper error value otherwise. | |
511 | */ | |
512 | static int create_trip_attrs(struct thermal_zone_device *tz, int mask) | |
513 | { | |
a369ee88 EV |
514 | struct attribute **attrs; |
515 | int indx; | |
516 | ||
517 | /* This function works only for zones with at least one trip */ | |
518 | if (tz->trips <= 0) | |
519 | return -EINVAL; | |
520 | ||
b819dc9e EV |
521 | tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs), |
522 | GFP_KERNEL); | |
a369ee88 EV |
523 | if (!tz->trip_type_attrs) |
524 | return -ENOMEM; | |
525 | ||
b819dc9e EV |
526 | tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs), |
527 | GFP_KERNEL); | |
a369ee88 EV |
528 | if (!tz->trip_temp_attrs) { |
529 | kfree(tz->trip_type_attrs); | |
530 | return -ENOMEM; | |
531 | } | |
532 | ||
533 | if (tz->ops->get_trip_hyst) { | |
b819dc9e EV |
534 | tz->trip_hyst_attrs = kcalloc(tz->trips, |
535 | sizeof(*tz->trip_hyst_attrs), | |
536 | GFP_KERNEL); | |
a369ee88 EV |
537 | if (!tz->trip_hyst_attrs) { |
538 | kfree(tz->trip_type_attrs); | |
539 | kfree(tz->trip_temp_attrs); | |
540 | return -ENOMEM; | |
541 | } | |
542 | } | |
543 | ||
b819dc9e | 544 | attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL); |
a369ee88 EV |
545 | if (!attrs) { |
546 | kfree(tz->trip_type_attrs); | |
547 | kfree(tz->trip_temp_attrs); | |
548 | if (tz->ops->get_trip_hyst) | |
549 | kfree(tz->trip_hyst_attrs); | |
550 | return -ENOMEM; | |
551 | } | |
552 | ||
553 | for (indx = 0; indx < tz->trips; indx++) { | |
554 | /* create trip type attribute */ | |
555 | snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, | |
556 | "trip_point_%d_type", indx); | |
557 | ||
558 | sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); | |
559 | tz->trip_type_attrs[indx].attr.attr.name = | |
560 | tz->trip_type_attrs[indx].name; | |
561 | tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; | |
562 | tz->trip_type_attrs[indx].attr.show = trip_point_type_show; | |
563 | attrs[indx] = &tz->trip_type_attrs[indx].attr.attr; | |
564 | ||
565 | /* create trip temp attribute */ | |
566 | snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH, | |
567 | "trip_point_%d_temp", indx); | |
568 | ||
569 | sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr); | |
570 | tz->trip_temp_attrs[indx].attr.attr.name = | |
571 | tz->trip_temp_attrs[indx].name; | |
572 | tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO; | |
573 | tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show; | |
574 | if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) && | |
575 | mask & (1 << indx)) { | |
576 | tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; | |
577 | tz->trip_temp_attrs[indx].attr.store = | |
578 | trip_point_temp_store; | |
579 | } | |
580 | attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr; | |
581 | ||
582 | /* create Optional trip hyst attribute */ | |
583 | if (!tz->ops->get_trip_hyst) | |
584 | continue; | |
585 | snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH, | |
586 | "trip_point_%d_hyst", indx); | |
587 | ||
588 | sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr); | |
589 | tz->trip_hyst_attrs[indx].attr.attr.name = | |
590 | tz->trip_hyst_attrs[indx].name; | |
591 | tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO; | |
592 | tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show; | |
593 | if (tz->ops->set_trip_hyst) { | |
594 | tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR; | |
595 | tz->trip_hyst_attrs[indx].attr.store = | |
596 | trip_point_hyst_store; | |
597 | } | |
598 | attrs[indx + tz->trips * 2] = | |
599 | &tz->trip_hyst_attrs[indx].attr.attr; | |
600 | } | |
601 | attrs[tz->trips * 3] = NULL; | |
602 | ||
603 | tz->trips_attribute_group.attrs = attrs; | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
32fa5ba3 CJ |
608 | /** |
609 | * destroy_trip_attrs() - destroy attributes for trip points | |
610 | * @tz: the thermal zone device | |
611 | * | |
612 | * helper function to free resources allocated by create_trip_attrs() | |
613 | */ | |
614 | static void destroy_trip_attrs(struct thermal_zone_device *tz) | |
615 | { | |
616 | if (!tz) | |
617 | return; | |
618 | ||
619 | kfree(tz->trip_type_attrs); | |
620 | kfree(tz->trip_temp_attrs); | |
621 | if (tz->ops->get_trip_hyst) | |
622 | kfree(tz->trip_hyst_attrs); | |
623 | kfree(tz->trips_attribute_group.attrs); | |
624 | } | |
625 | ||
a369ee88 EV |
626 | int thermal_zone_create_device_groups(struct thermal_zone_device *tz, |
627 | int mask) | |
628 | { | |
629 | const struct attribute_group **groups; | |
630 | int i, size, result; | |
631 | ||
632 | /* we need one extra for trips and the NULL to terminate the array */ | |
633 | size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2; | |
634 | /* This also takes care of API requirement to be NULL terminated */ | |
635 | groups = kcalloc(size, sizeof(*groups), GFP_KERNEL); | |
636 | if (!groups) | |
637 | return -ENOMEM; | |
638 | ||
639 | for (i = 0; i < size - 2; i++) | |
640 | groups[i] = thermal_zone_attribute_groups[i]; | |
641 | ||
642 | if (tz->trips) { | |
643 | result = create_trip_attrs(tz, mask); | |
644 | if (result) { | |
645 | kfree(groups); | |
646 | ||
647 | return result; | |
648 | } | |
649 | ||
650 | groups[size - 2] = &tz->trips_attribute_group; | |
651 | } | |
652 | ||
653 | tz->device.groups = groups; | |
654 | ||
655 | return 0; | |
656 | } | |
45cf2ec9 | 657 | |
32fa5ba3 CJ |
658 | void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz) |
659 | { | |
660 | if (!tz) | |
661 | return; | |
662 | ||
663 | if (tz->trips) | |
664 | destroy_trip_attrs(tz); | |
665 | ||
666 | kfree(tz->device.groups); | |
667 | } | |
668 | ||
45cf2ec9 EV |
669 | /* sys I/F for cooling device */ |
670 | static ssize_t | |
671 | thermal_cooling_device_type_show(struct device *dev, | |
672 | struct device_attribute *attr, char *buf) | |
673 | { | |
674 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
675 | ||
676 | return sprintf(buf, "%s\n", cdev->type); | |
677 | } | |
678 | ||
679 | static ssize_t | |
680 | thermal_cooling_device_max_state_show(struct device *dev, | |
681 | struct device_attribute *attr, char *buf) | |
682 | { | |
683 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
684 | unsigned long state; | |
685 | int ret; | |
686 | ||
687 | ret = cdev->ops->get_max_state(cdev, &state); | |
688 | if (ret) | |
689 | return ret; | |
690 | return sprintf(buf, "%ld\n", state); | |
691 | } | |
692 | ||
693 | static ssize_t | |
694 | thermal_cooling_device_cur_state_show(struct device *dev, | |
695 | struct device_attribute *attr, char *buf) | |
696 | { | |
697 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
698 | unsigned long state; | |
699 | int ret; | |
700 | ||
701 | ret = cdev->ops->get_cur_state(cdev, &state); | |
702 | if (ret) | |
703 | return ret; | |
704 | return sprintf(buf, "%ld\n", state); | |
705 | } | |
706 | ||
707 | static ssize_t | |
708 | thermal_cooling_device_cur_state_store(struct device *dev, | |
709 | struct device_attribute *attr, | |
710 | const char *buf, size_t count) | |
711 | { | |
712 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
713 | unsigned long state; | |
714 | int result; | |
715 | ||
716 | if (sscanf(buf, "%ld\n", &state) != 1) | |
717 | return -EINVAL; | |
718 | ||
719 | if ((long)state < 0) | |
720 | return -EINVAL; | |
721 | ||
722 | result = cdev->ops->set_cur_state(cdev, state); | |
723 | if (result) | |
724 | return result; | |
725 | return count; | |
726 | } | |
727 | ||
728 | static struct device_attribute dev_attr_cdev_type = | |
729 | __ATTR(type, 0444, thermal_cooling_device_type_show, NULL); | |
730 | static DEVICE_ATTR(max_state, 0444, | |
731 | thermal_cooling_device_max_state_show, NULL); | |
732 | static DEVICE_ATTR(cur_state, 0644, | |
733 | thermal_cooling_device_cur_state_show, | |
734 | thermal_cooling_device_cur_state_store); | |
735 | ||
736 | static struct attribute *cooling_device_attrs[] = { | |
737 | &dev_attr_cdev_type.attr, | |
738 | &dev_attr_max_state.attr, | |
739 | &dev_attr_cur_state.attr, | |
740 | NULL, | |
741 | }; | |
742 | ||
743 | static const struct attribute_group cooling_device_attr_group = { | |
744 | .attrs = cooling_device_attrs, | |
745 | }; | |
746 | ||
747 | static const struct attribute_group *cooling_device_attr_groups[] = { | |
748 | &cooling_device_attr_group, | |
749 | NULL, | |
750 | }; | |
751 | ||
752 | void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev) | |
753 | { | |
754 | cdev->device.groups = cooling_device_attr_groups; | |
755 | } | |
756 | ||
757 | /* these helper will be used only at the time of bindig */ | |
758 | ssize_t | |
759 | thermal_cooling_device_trip_point_show(struct device *dev, | |
760 | struct device_attribute *attr, char *buf) | |
761 | { | |
762 | struct thermal_instance *instance; | |
763 | ||
764 | instance = | |
765 | container_of(attr, struct thermal_instance, attr); | |
766 | ||
767 | if (instance->trip == THERMAL_TRIPS_NONE) | |
768 | return sprintf(buf, "-1\n"); | |
769 | else | |
770 | return sprintf(buf, "%d\n", instance->trip); | |
771 | } | |
772 | ||
773 | ssize_t | |
774 | thermal_cooling_device_weight_show(struct device *dev, | |
775 | struct device_attribute *attr, char *buf) | |
776 | { | |
777 | struct thermal_instance *instance; | |
778 | ||
779 | instance = container_of(attr, struct thermal_instance, weight_attr); | |
780 | ||
781 | return sprintf(buf, "%d\n", instance->weight); | |
782 | } | |
783 | ||
784 | ssize_t | |
785 | thermal_cooling_device_weight_store(struct device *dev, | |
786 | struct device_attribute *attr, | |
787 | const char *buf, size_t count) | |
788 | { | |
789 | struct thermal_instance *instance; | |
790 | int ret, weight; | |
791 | ||
792 | ret = kstrtoint(buf, 0, &weight); | |
793 | if (ret) | |
794 | return ret; | |
795 | ||
796 | instance = container_of(attr, struct thermal_instance, weight_attr); | |
797 | instance->weight = weight; | |
798 | ||
799 | return count; | |
800 | } |