]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * thermal.c - Generic Thermal Management Sysfs support. | |
3 | * | |
4 | * Copyright (C) 2008 Intel Corp | |
5 | * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> | |
6 | * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> | |
7 | * | |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/kdev_t.h> | |
33 | #include <linux/idr.h> | |
34 | #include <linux/thermal.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/reboot.h> | |
37 | #include <net/netlink.h> | |
38 | #include <net/genetlink.h> | |
39 | ||
40 | MODULE_AUTHOR("Zhang Rui"); | |
41 | MODULE_DESCRIPTION("Generic thermal management sysfs support"); | |
42 | MODULE_LICENSE("GPL"); | |
43 | ||
44 | struct thermal_cooling_device_instance { | |
45 | int id; | |
46 | char name[THERMAL_NAME_LENGTH]; | |
47 | struct thermal_zone_device *tz; | |
48 | struct thermal_cooling_device *cdev; | |
49 | int trip; | |
50 | char attr_name[THERMAL_NAME_LENGTH]; | |
51 | struct device_attribute attr; | |
52 | struct list_head node; | |
53 | }; | |
54 | ||
55 | static DEFINE_IDR(thermal_tz_idr); | |
56 | static DEFINE_IDR(thermal_cdev_idr); | |
57 | static DEFINE_MUTEX(thermal_idr_lock); | |
58 | ||
59 | static LIST_HEAD(thermal_tz_list); | |
60 | static LIST_HEAD(thermal_cdev_list); | |
61 | static DEFINE_MUTEX(thermal_list_lock); | |
62 | ||
63 | static int get_idr(struct idr *idr, struct mutex *lock, int *id) | |
64 | { | |
65 | int err; | |
66 | ||
67 | again: | |
68 | if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0)) | |
69 | return -ENOMEM; | |
70 | ||
71 | if (lock) | |
72 | mutex_lock(lock); | |
73 | err = idr_get_new(idr, NULL, id); | |
74 | if (lock) | |
75 | mutex_unlock(lock); | |
76 | if (unlikely(err == -EAGAIN)) | |
77 | goto again; | |
78 | else if (unlikely(err)) | |
79 | return err; | |
80 | ||
81 | *id = *id & MAX_ID_MASK; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static void release_idr(struct idr *idr, struct mutex *lock, int id) | |
86 | { | |
87 | if (lock) | |
88 | mutex_lock(lock); | |
89 | idr_remove(idr, id); | |
90 | if (lock) | |
91 | mutex_unlock(lock); | |
92 | } | |
93 | ||
94 | /* sys I/F for thermal zone */ | |
95 | ||
96 | #define to_thermal_zone(_dev) \ | |
97 | container_of(_dev, struct thermal_zone_device, device) | |
98 | ||
99 | static ssize_t | |
100 | type_show(struct device *dev, struct device_attribute *attr, char *buf) | |
101 | { | |
102 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
103 | ||
104 | return sprintf(buf, "%s\n", tz->type); | |
105 | } | |
106 | ||
107 | static ssize_t | |
108 | temp_show(struct device *dev, struct device_attribute *attr, char *buf) | |
109 | { | |
110 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
111 | long temperature; | |
112 | int ret; | |
113 | ||
114 | if (!tz->ops->get_temp) | |
115 | return -EPERM; | |
116 | ||
117 | ret = tz->ops->get_temp(tz, &temperature); | |
118 | ||
119 | if (ret) | |
120 | return ret; | |
121 | ||
122 | return sprintf(buf, "%ld\n", temperature); | |
123 | } | |
124 | ||
125 | static ssize_t | |
126 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) | |
127 | { | |
128 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
129 | enum thermal_device_mode mode; | |
130 | int result; | |
131 | ||
132 | if (!tz->ops->get_mode) | |
133 | return -EPERM; | |
134 | ||
135 | result = tz->ops->get_mode(tz, &mode); | |
136 | if (result) | |
137 | return result; | |
138 | ||
139 | return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled" | |
140 | : "disabled"); | |
141 | } | |
142 | ||
143 | static ssize_t | |
144 | mode_store(struct device *dev, struct device_attribute *attr, | |
145 | const char *buf, size_t count) | |
146 | { | |
147 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
148 | int result; | |
149 | ||
150 | if (!tz->ops->set_mode) | |
151 | return -EPERM; | |
152 | ||
153 | if (!strncmp(buf, "enabled", sizeof("enabled") - 1)) | |
154 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); | |
155 | else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) | |
156 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED); | |
157 | else | |
158 | result = -EINVAL; | |
159 | ||
160 | if (result) | |
161 | return result; | |
162 | ||
163 | return count; | |
164 | } | |
165 | ||
166 | static ssize_t | |
167 | trip_point_type_show(struct device *dev, struct device_attribute *attr, | |
168 | char *buf) | |
169 | { | |
170 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
171 | enum thermal_trip_type type; | |
172 | int trip, result; | |
173 | ||
174 | if (!tz->ops->get_trip_type) | |
175 | return -EPERM; | |
176 | ||
177 | if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip)) | |
178 | return -EINVAL; | |
179 | ||
180 | result = tz->ops->get_trip_type(tz, trip, &type); | |
181 | if (result) | |
182 | return result; | |
183 | ||
184 | switch (type) { | |
185 | case THERMAL_TRIP_CRITICAL: | |
186 | return sprintf(buf, "critical\n"); | |
187 | case THERMAL_TRIP_HOT: | |
188 | return sprintf(buf, "hot\n"); | |
189 | case THERMAL_TRIP_PASSIVE: | |
190 | return sprintf(buf, "passive\n"); | |
191 | case THERMAL_TRIP_ACTIVE: | |
192 | return sprintf(buf, "active\n"); | |
193 | default: | |
194 | return sprintf(buf, "unknown\n"); | |
195 | } | |
196 | } | |
197 | ||
198 | static ssize_t | |
199 | trip_point_temp_store(struct device *dev, struct device_attribute *attr, | |
200 | const char *buf, size_t count) | |
201 | { | |
202 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
203 | int trip, ret; | |
204 | unsigned long temperature; | |
205 | ||
206 | if (!tz->ops->set_trip_temp) | |
207 | return -EPERM; | |
208 | ||
209 | if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) | |
210 | return -EINVAL; | |
211 | ||
212 | if (kstrtoul(buf, 10, &temperature)) | |
213 | return -EINVAL; | |
214 | ||
215 | ret = tz->ops->set_trip_temp(tz, trip, temperature); | |
216 | ||
217 | return ret ? ret : count; | |
218 | } | |
219 | ||
220 | static ssize_t | |
221 | trip_point_temp_show(struct device *dev, struct device_attribute *attr, | |
222 | char *buf) | |
223 | { | |
224 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
225 | int trip, ret; | |
226 | long temperature; | |
227 | ||
228 | if (!tz->ops->get_trip_temp) | |
229 | return -EPERM; | |
230 | ||
231 | if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) | |
232 | return -EINVAL; | |
233 | ||
234 | ret = tz->ops->get_trip_temp(tz, trip, &temperature); | |
235 | ||
236 | if (ret) | |
237 | return ret; | |
238 | ||
239 | return sprintf(buf, "%ld\n", temperature); | |
240 | } | |
241 | ||
242 | static ssize_t | |
243 | passive_store(struct device *dev, struct device_attribute *attr, | |
244 | const char *buf, size_t count) | |
245 | { | |
246 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
247 | struct thermal_cooling_device *cdev = NULL; | |
248 | int state; | |
249 | ||
250 | if (!sscanf(buf, "%d\n", &state)) | |
251 | return -EINVAL; | |
252 | ||
253 | /* sanity check: values below 1000 millicelcius don't make sense | |
254 | * and can cause the system to go into a thermal heart attack | |
255 | */ | |
256 | if (state && state < 1000) | |
257 | return -EINVAL; | |
258 | ||
259 | if (state && !tz->forced_passive) { | |
260 | mutex_lock(&thermal_list_lock); | |
261 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
262 | if (!strncmp("Processor", cdev->type, | |
263 | sizeof("Processor"))) | |
264 | thermal_zone_bind_cooling_device(tz, | |
265 | THERMAL_TRIPS_NONE, | |
266 | cdev); | |
267 | } | |
268 | mutex_unlock(&thermal_list_lock); | |
269 | if (!tz->passive_delay) | |
270 | tz->passive_delay = 1000; | |
271 | } else if (!state && tz->forced_passive) { | |
272 | mutex_lock(&thermal_list_lock); | |
273 | list_for_each_entry(cdev, &thermal_cdev_list, node) { | |
274 | if (!strncmp("Processor", cdev->type, | |
275 | sizeof("Processor"))) | |
276 | thermal_zone_unbind_cooling_device(tz, | |
277 | THERMAL_TRIPS_NONE, | |
278 | cdev); | |
279 | } | |
280 | mutex_unlock(&thermal_list_lock); | |
281 | tz->passive_delay = 0; | |
282 | } | |
283 | ||
284 | tz->tc1 = 1; | |
285 | tz->tc2 = 1; | |
286 | ||
287 | tz->forced_passive = state; | |
288 | ||
289 | thermal_zone_device_update(tz); | |
290 | ||
291 | return count; | |
292 | } | |
293 | ||
294 | static ssize_t | |
295 | passive_show(struct device *dev, struct device_attribute *attr, | |
296 | char *buf) | |
297 | { | |
298 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
299 | ||
300 | return sprintf(buf, "%d\n", tz->forced_passive); | |
301 | } | |
302 | ||
303 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
304 | static DEVICE_ATTR(temp, 0444, temp_show, NULL); | |
305 | static DEVICE_ATTR(mode, 0644, mode_show, mode_store); | |
306 | static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); | |
307 | ||
308 | /* sys I/F for cooling device */ | |
309 | #define to_cooling_device(_dev) \ | |
310 | container_of(_dev, struct thermal_cooling_device, device) | |
311 | ||
312 | static ssize_t | |
313 | thermal_cooling_device_type_show(struct device *dev, | |
314 | struct device_attribute *attr, char *buf) | |
315 | { | |
316 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
317 | ||
318 | return sprintf(buf, "%s\n", cdev->type); | |
319 | } | |
320 | ||
321 | static ssize_t | |
322 | thermal_cooling_device_max_state_show(struct device *dev, | |
323 | struct device_attribute *attr, char *buf) | |
324 | { | |
325 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
326 | unsigned long state; | |
327 | int ret; | |
328 | ||
329 | ret = cdev->ops->get_max_state(cdev, &state); | |
330 | if (ret) | |
331 | return ret; | |
332 | return sprintf(buf, "%ld\n", state); | |
333 | } | |
334 | ||
335 | static ssize_t | |
336 | thermal_cooling_device_cur_state_show(struct device *dev, | |
337 | struct device_attribute *attr, char *buf) | |
338 | { | |
339 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
340 | unsigned long state; | |
341 | int ret; | |
342 | ||
343 | ret = cdev->ops->get_cur_state(cdev, &state); | |
344 | if (ret) | |
345 | return ret; | |
346 | return sprintf(buf, "%ld\n", state); | |
347 | } | |
348 | ||
349 | static ssize_t | |
350 | thermal_cooling_device_cur_state_store(struct device *dev, | |
351 | struct device_attribute *attr, | |
352 | const char *buf, size_t count) | |
353 | { | |
354 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
355 | unsigned long state; | |
356 | int result; | |
357 | ||
358 | if (!sscanf(buf, "%ld\n", &state)) | |
359 | return -EINVAL; | |
360 | ||
361 | if ((long)state < 0) | |
362 | return -EINVAL; | |
363 | ||
364 | result = cdev->ops->set_cur_state(cdev, state); | |
365 | if (result) | |
366 | return result; | |
367 | return count; | |
368 | } | |
369 | ||
370 | static struct device_attribute dev_attr_cdev_type = | |
371 | __ATTR(type, 0444, thermal_cooling_device_type_show, NULL); | |
372 | static DEVICE_ATTR(max_state, 0444, | |
373 | thermal_cooling_device_max_state_show, NULL); | |
374 | static DEVICE_ATTR(cur_state, 0644, | |
375 | thermal_cooling_device_cur_state_show, | |
376 | thermal_cooling_device_cur_state_store); | |
377 | ||
378 | static ssize_t | |
379 | thermal_cooling_device_trip_point_show(struct device *dev, | |
380 | struct device_attribute *attr, char *buf) | |
381 | { | |
382 | struct thermal_cooling_device_instance *instance; | |
383 | ||
384 | instance = | |
385 | container_of(attr, struct thermal_cooling_device_instance, attr); | |
386 | ||
387 | if (instance->trip == THERMAL_TRIPS_NONE) | |
388 | return sprintf(buf, "-1\n"); | |
389 | else | |
390 | return sprintf(buf, "%d\n", instance->trip); | |
391 | } | |
392 | ||
393 | /* Device management */ | |
394 | ||
395 | #if defined(CONFIG_THERMAL_HWMON) | |
396 | ||
397 | /* hwmon sys I/F */ | |
398 | #include <linux/hwmon.h> | |
399 | ||
400 | /* thermal zone devices with the same type share one hwmon device */ | |
401 | struct thermal_hwmon_device { | |
402 | char type[THERMAL_NAME_LENGTH]; | |
403 | struct device *device; | |
404 | int count; | |
405 | struct list_head tz_list; | |
406 | struct list_head node; | |
407 | }; | |
408 | ||
409 | struct thermal_hwmon_attr { | |
410 | struct device_attribute attr; | |
411 | char name[16]; | |
412 | }; | |
413 | ||
414 | /* one temperature input for each thermal zone */ | |
415 | struct thermal_hwmon_temp { | |
416 | struct list_head hwmon_node; | |
417 | struct thermal_zone_device *tz; | |
418 | struct thermal_hwmon_attr temp_input; /* hwmon sys attr */ | |
419 | struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */ | |
420 | }; | |
421 | ||
422 | static LIST_HEAD(thermal_hwmon_list); | |
423 | ||
424 | static ssize_t | |
425 | name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
426 | { | |
427 | struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev); | |
428 | return sprintf(buf, "%s\n", hwmon->type); | |
429 | } | |
430 | static DEVICE_ATTR(name, 0444, name_show, NULL); | |
431 | ||
432 | static ssize_t | |
433 | temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) | |
434 | { | |
435 | long temperature; | |
436 | int ret; | |
437 | struct thermal_hwmon_attr *hwmon_attr | |
438 | = container_of(attr, struct thermal_hwmon_attr, attr); | |
439 | struct thermal_hwmon_temp *temp | |
440 | = container_of(hwmon_attr, struct thermal_hwmon_temp, | |
441 | temp_input); | |
442 | struct thermal_zone_device *tz = temp->tz; | |
443 | ||
444 | ret = tz->ops->get_temp(tz, &temperature); | |
445 | ||
446 | if (ret) | |
447 | return ret; | |
448 | ||
449 | return sprintf(buf, "%ld\n", temperature); | |
450 | } | |
451 | ||
452 | static ssize_t | |
453 | temp_crit_show(struct device *dev, struct device_attribute *attr, | |
454 | char *buf) | |
455 | { | |
456 | struct thermal_hwmon_attr *hwmon_attr | |
457 | = container_of(attr, struct thermal_hwmon_attr, attr); | |
458 | struct thermal_hwmon_temp *temp | |
459 | = container_of(hwmon_attr, struct thermal_hwmon_temp, | |
460 | temp_crit); | |
461 | struct thermal_zone_device *tz = temp->tz; | |
462 | long temperature; | |
463 | int ret; | |
464 | ||
465 | ret = tz->ops->get_trip_temp(tz, 0, &temperature); | |
466 | if (ret) | |
467 | return ret; | |
468 | ||
469 | return sprintf(buf, "%ld\n", temperature); | |
470 | } | |
471 | ||
472 | ||
473 | static struct thermal_hwmon_device * | |
474 | thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz) | |
475 | { | |
476 | struct thermal_hwmon_device *hwmon; | |
477 | ||
478 | mutex_lock(&thermal_list_lock); | |
479 | list_for_each_entry(hwmon, &thermal_hwmon_list, node) | |
480 | if (!strcmp(hwmon->type, tz->type)) { | |
481 | mutex_unlock(&thermal_list_lock); | |
482 | return hwmon; | |
483 | } | |
484 | mutex_unlock(&thermal_list_lock); | |
485 | ||
486 | return NULL; | |
487 | } | |
488 | ||
489 | /* Find the temperature input matching a given thermal zone */ | |
490 | static struct thermal_hwmon_temp * | |
491 | thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon, | |
492 | const struct thermal_zone_device *tz) | |
493 | { | |
494 | struct thermal_hwmon_temp *temp; | |
495 | ||
496 | mutex_lock(&thermal_list_lock); | |
497 | list_for_each_entry(temp, &hwmon->tz_list, hwmon_node) | |
498 | if (temp->tz == tz) { | |
499 | mutex_unlock(&thermal_list_lock); | |
500 | return temp; | |
501 | } | |
502 | mutex_unlock(&thermal_list_lock); | |
503 | ||
504 | return NULL; | |
505 | } | |
506 | ||
507 | static int | |
508 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) | |
509 | { | |
510 | struct thermal_hwmon_device *hwmon; | |
511 | struct thermal_hwmon_temp *temp; | |
512 | int new_hwmon_device = 1; | |
513 | int result; | |
514 | ||
515 | hwmon = thermal_hwmon_lookup_by_type(tz); | |
516 | if (hwmon) { | |
517 | new_hwmon_device = 0; | |
518 | goto register_sys_interface; | |
519 | } | |
520 | ||
521 | hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL); | |
522 | if (!hwmon) | |
523 | return -ENOMEM; | |
524 | ||
525 | INIT_LIST_HEAD(&hwmon->tz_list); | |
526 | strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH); | |
527 | hwmon->device = hwmon_device_register(NULL); | |
528 | if (IS_ERR(hwmon->device)) { | |
529 | result = PTR_ERR(hwmon->device); | |
530 | goto free_mem; | |
531 | } | |
532 | dev_set_drvdata(hwmon->device, hwmon); | |
533 | result = device_create_file(hwmon->device, &dev_attr_name); | |
534 | if (result) | |
535 | goto free_mem; | |
536 | ||
537 | register_sys_interface: | |
538 | temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL); | |
539 | if (!temp) { | |
540 | result = -ENOMEM; | |
541 | goto unregister_name; | |
542 | } | |
543 | ||
544 | temp->tz = tz; | |
545 | hwmon->count++; | |
546 | ||
547 | snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH, | |
548 | "temp%d_input", hwmon->count); | |
549 | temp->temp_input.attr.attr.name = temp->temp_input.name; | |
550 | temp->temp_input.attr.attr.mode = 0444; | |
551 | temp->temp_input.attr.show = temp_input_show; | |
552 | sysfs_attr_init(&temp->temp_input.attr.attr); | |
553 | result = device_create_file(hwmon->device, &temp->temp_input.attr); | |
554 | if (result) | |
555 | goto free_temp_mem; | |
556 | ||
557 | if (tz->ops->get_crit_temp) { | |
558 | unsigned long temperature; | |
559 | if (!tz->ops->get_crit_temp(tz, &temperature)) { | |
560 | snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH, | |
561 | "temp%d_crit", hwmon->count); | |
562 | temp->temp_crit.attr.attr.name = temp->temp_crit.name; | |
563 | temp->temp_crit.attr.attr.mode = 0444; | |
564 | temp->temp_crit.attr.show = temp_crit_show; | |
565 | sysfs_attr_init(&temp->temp_crit.attr.attr); | |
566 | result = device_create_file(hwmon->device, | |
567 | &temp->temp_crit.attr); | |
568 | if (result) | |
569 | goto unregister_input; | |
570 | } | |
571 | } | |
572 | ||
573 | mutex_lock(&thermal_list_lock); | |
574 | if (new_hwmon_device) | |
575 | list_add_tail(&hwmon->node, &thermal_hwmon_list); | |
576 | list_add_tail(&temp->hwmon_node, &hwmon->tz_list); | |
577 | mutex_unlock(&thermal_list_lock); | |
578 | ||
579 | return 0; | |
580 | ||
581 | unregister_input: | |
582 | device_remove_file(hwmon->device, &temp->temp_input.attr); | |
583 | free_temp_mem: | |
584 | kfree(temp); | |
585 | unregister_name: | |
586 | if (new_hwmon_device) { | |
587 | device_remove_file(hwmon->device, &dev_attr_name); | |
588 | hwmon_device_unregister(hwmon->device); | |
589 | } | |
590 | free_mem: | |
591 | if (new_hwmon_device) | |
592 | kfree(hwmon); | |
593 | ||
594 | return result; | |
595 | } | |
596 | ||
597 | static void | |
598 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) | |
599 | { | |
600 | struct thermal_hwmon_device *hwmon; | |
601 | struct thermal_hwmon_temp *temp; | |
602 | ||
603 | hwmon = thermal_hwmon_lookup_by_type(tz); | |
604 | if (unlikely(!hwmon)) { | |
605 | /* Should never happen... */ | |
606 | dev_dbg(&tz->device, "hwmon device lookup failed!\n"); | |
607 | return; | |
608 | } | |
609 | ||
610 | temp = thermal_hwmon_lookup_temp(hwmon, tz); | |
611 | if (unlikely(!temp)) { | |
612 | /* Should never happen... */ | |
613 | dev_dbg(&tz->device, "temperature input lookup failed!\n"); | |
614 | return; | |
615 | } | |
616 | ||
617 | device_remove_file(hwmon->device, &temp->temp_input.attr); | |
618 | if (tz->ops->get_crit_temp) | |
619 | device_remove_file(hwmon->device, &temp->temp_crit.attr); | |
620 | ||
621 | mutex_lock(&thermal_list_lock); | |
622 | list_del(&temp->hwmon_node); | |
623 | kfree(temp); | |
624 | if (!list_empty(&hwmon->tz_list)) { | |
625 | mutex_unlock(&thermal_list_lock); | |
626 | return; | |
627 | } | |
628 | list_del(&hwmon->node); | |
629 | mutex_unlock(&thermal_list_lock); | |
630 | ||
631 | device_remove_file(hwmon->device, &dev_attr_name); | |
632 | hwmon_device_unregister(hwmon->device); | |
633 | kfree(hwmon); | |
634 | } | |
635 | #else | |
636 | static int | |
637 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) | |
638 | { | |
639 | return 0; | |
640 | } | |
641 | ||
642 | static void | |
643 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) | |
644 | { | |
645 | } | |
646 | #endif | |
647 | ||
648 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, | |
649 | int delay) | |
650 | { | |
651 | cancel_delayed_work(&(tz->poll_queue)); | |
652 | ||
653 | if (!delay) | |
654 | return; | |
655 | ||
656 | if (delay > 1000) | |
657 | queue_delayed_work(system_freezable_wq, &(tz->poll_queue), | |
658 | round_jiffies(msecs_to_jiffies(delay))); | |
659 | else | |
660 | queue_delayed_work(system_freezable_wq, &(tz->poll_queue), | |
661 | msecs_to_jiffies(delay)); | |
662 | } | |
663 | ||
664 | static void thermal_zone_device_passive(struct thermal_zone_device *tz, | |
665 | int temp, int trip_temp, int trip) | |
666 | { | |
667 | int trend = 0; | |
668 | struct thermal_cooling_device_instance *instance; | |
669 | struct thermal_cooling_device *cdev; | |
670 | long state, max_state; | |
671 | ||
672 | /* | |
673 | * Above Trip? | |
674 | * ----------- | |
675 | * Calculate the thermal trend (using the passive cooling equation) | |
676 | * and modify the performance limit for all passive cooling devices | |
677 | * accordingly. Note that we assume symmetry. | |
678 | */ | |
679 | if (temp >= trip_temp) { | |
680 | tz->passive = true; | |
681 | ||
682 | trend = (tz->tc1 * (temp - tz->last_temperature)) + | |
683 | (tz->tc2 * (temp - trip_temp)); | |
684 | ||
685 | /* Heating up? */ | |
686 | if (trend > 0) { | |
687 | list_for_each_entry(instance, &tz->cooling_devices, | |
688 | node) { | |
689 | if (instance->trip != trip) | |
690 | continue; | |
691 | cdev = instance->cdev; | |
692 | cdev->ops->get_cur_state(cdev, &state); | |
693 | cdev->ops->get_max_state(cdev, &max_state); | |
694 | if (state++ < max_state) | |
695 | cdev->ops->set_cur_state(cdev, state); | |
696 | } | |
697 | } else if (trend < 0) { /* Cooling off? */ | |
698 | list_for_each_entry(instance, &tz->cooling_devices, | |
699 | node) { | |
700 | if (instance->trip != trip) | |
701 | continue; | |
702 | cdev = instance->cdev; | |
703 | cdev->ops->get_cur_state(cdev, &state); | |
704 | cdev->ops->get_max_state(cdev, &max_state); | |
705 | if (state > 0) | |
706 | cdev->ops->set_cur_state(cdev, --state); | |
707 | } | |
708 | } | |
709 | return; | |
710 | } | |
711 | ||
712 | /* | |
713 | * Below Trip? | |
714 | * ----------- | |
715 | * Implement passive cooling hysteresis to slowly increase performance | |
716 | * and avoid thrashing around the passive trip point. Note that we | |
717 | * assume symmetry. | |
718 | */ | |
719 | list_for_each_entry(instance, &tz->cooling_devices, node) { | |
720 | if (instance->trip != trip) | |
721 | continue; | |
722 | cdev = instance->cdev; | |
723 | cdev->ops->get_cur_state(cdev, &state); | |
724 | cdev->ops->get_max_state(cdev, &max_state); | |
725 | if (state > 0) | |
726 | cdev->ops->set_cur_state(cdev, --state); | |
727 | if (state == 0) | |
728 | tz->passive = false; | |
729 | } | |
730 | } | |
731 | ||
732 | static void thermal_zone_device_check(struct work_struct *work) | |
733 | { | |
734 | struct thermal_zone_device *tz = container_of(work, struct | |
735 | thermal_zone_device, | |
736 | poll_queue.work); | |
737 | thermal_zone_device_update(tz); | |
738 | } | |
739 | ||
740 | /** | |
741 | * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone | |
742 | * @tz: thermal zone device | |
743 | * @trip: indicates which trip point the cooling devices is | |
744 | * associated with in this thermal zone. | |
745 | * @cdev: thermal cooling device | |
746 | * | |
747 | * This function is usually called in the thermal zone device .bind callback. | |
748 | */ | |
749 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, | |
750 | int trip, | |
751 | struct thermal_cooling_device *cdev) | |
752 | { | |
753 | struct thermal_cooling_device_instance *dev; | |
754 | struct thermal_cooling_device_instance *pos; | |
755 | struct thermal_zone_device *pos1; | |
756 | struct thermal_cooling_device *pos2; | |
757 | int result; | |
758 | ||
759 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) | |
760 | return -EINVAL; | |
761 | ||
762 | list_for_each_entry(pos1, &thermal_tz_list, node) { | |
763 | if (pos1 == tz) | |
764 | break; | |
765 | } | |
766 | list_for_each_entry(pos2, &thermal_cdev_list, node) { | |
767 | if (pos2 == cdev) | |
768 | break; | |
769 | } | |
770 | ||
771 | if (tz != pos1 || cdev != pos2) | |
772 | return -EINVAL; | |
773 | ||
774 | dev = | |
775 | kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL); | |
776 | if (!dev) | |
777 | return -ENOMEM; | |
778 | dev->tz = tz; | |
779 | dev->cdev = cdev; | |
780 | dev->trip = trip; | |
781 | result = get_idr(&tz->idr, &tz->lock, &dev->id); | |
782 | if (result) | |
783 | goto free_mem; | |
784 | ||
785 | sprintf(dev->name, "cdev%d", dev->id); | |
786 | result = | |
787 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); | |
788 | if (result) | |
789 | goto release_idr; | |
790 | ||
791 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); | |
792 | sysfs_attr_init(&dev->attr.attr); | |
793 | dev->attr.attr.name = dev->attr_name; | |
794 | dev->attr.attr.mode = 0444; | |
795 | dev->attr.show = thermal_cooling_device_trip_point_show; | |
796 | result = device_create_file(&tz->device, &dev->attr); | |
797 | if (result) | |
798 | goto remove_symbol_link; | |
799 | ||
800 | mutex_lock(&tz->lock); | |
801 | list_for_each_entry(pos, &tz->cooling_devices, node) | |
802 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { | |
803 | result = -EEXIST; | |
804 | break; | |
805 | } | |
806 | if (!result) | |
807 | list_add_tail(&dev->node, &tz->cooling_devices); | |
808 | mutex_unlock(&tz->lock); | |
809 | ||
810 | if (!result) | |
811 | return 0; | |
812 | ||
813 | device_remove_file(&tz->device, &dev->attr); | |
814 | remove_symbol_link: | |
815 | sysfs_remove_link(&tz->device.kobj, dev->name); | |
816 | release_idr: | |
817 | release_idr(&tz->idr, &tz->lock, dev->id); | |
818 | free_mem: | |
819 | kfree(dev); | |
820 | return result; | |
821 | } | |
822 | EXPORT_SYMBOL(thermal_zone_bind_cooling_device); | |
823 | ||
824 | /** | |
825 | * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone | |
826 | * @tz: thermal zone device | |
827 | * @trip: indicates which trip point the cooling devices is | |
828 | * associated with in this thermal zone. | |
829 | * @cdev: thermal cooling device | |
830 | * | |
831 | * This function is usually called in the thermal zone device .unbind callback. | |
832 | */ | |
833 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, | |
834 | int trip, | |
835 | struct thermal_cooling_device *cdev) | |
836 | { | |
837 | struct thermal_cooling_device_instance *pos, *next; | |
838 | ||
839 | mutex_lock(&tz->lock); | |
840 | list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) { | |
841 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { | |
842 | list_del(&pos->node); | |
843 | mutex_unlock(&tz->lock); | |
844 | goto unbind; | |
845 | } | |
846 | } | |
847 | mutex_unlock(&tz->lock); | |
848 | ||
849 | return -ENODEV; | |
850 | ||
851 | unbind: | |
852 | device_remove_file(&tz->device, &pos->attr); | |
853 | sysfs_remove_link(&tz->device.kobj, pos->name); | |
854 | release_idr(&tz->idr, &tz->lock, pos->id); | |
855 | kfree(pos); | |
856 | return 0; | |
857 | } | |
858 | EXPORT_SYMBOL(thermal_zone_unbind_cooling_device); | |
859 | ||
860 | static void thermal_release(struct device *dev) | |
861 | { | |
862 | struct thermal_zone_device *tz; | |
863 | struct thermal_cooling_device *cdev; | |
864 | ||
865 | if (!strncmp(dev_name(dev), "thermal_zone", | |
866 | sizeof("thermal_zone") - 1)) { | |
867 | tz = to_thermal_zone(dev); | |
868 | kfree(tz); | |
869 | } else { | |
870 | cdev = to_cooling_device(dev); | |
871 | kfree(cdev); | |
872 | } | |
873 | } | |
874 | ||
875 | static struct class thermal_class = { | |
876 | .name = "thermal", | |
877 | .dev_release = thermal_release, | |
878 | }; | |
879 | ||
880 | /** | |
881 | * thermal_cooling_device_register - register a new thermal cooling device | |
882 | * @type: the thermal cooling device type. | |
883 | * @devdata: device private data. | |
884 | * @ops: standard thermal cooling devices callbacks. | |
885 | */ | |
886 | struct thermal_cooling_device * | |
887 | thermal_cooling_device_register(char *type, void *devdata, | |
888 | const struct thermal_cooling_device_ops *ops) | |
889 | { | |
890 | struct thermal_cooling_device *cdev; | |
891 | struct thermal_zone_device *pos; | |
892 | int result; | |
893 | ||
894 | if (strlen(type) >= THERMAL_NAME_LENGTH) | |
895 | return ERR_PTR(-EINVAL); | |
896 | ||
897 | if (!ops || !ops->get_max_state || !ops->get_cur_state || | |
898 | !ops->set_cur_state) | |
899 | return ERR_PTR(-EINVAL); | |
900 | ||
901 | cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL); | |
902 | if (!cdev) | |
903 | return ERR_PTR(-ENOMEM); | |
904 | ||
905 | result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id); | |
906 | if (result) { | |
907 | kfree(cdev); | |
908 | return ERR_PTR(result); | |
909 | } | |
910 | ||
911 | strcpy(cdev->type, type); | |
912 | cdev->ops = ops; | |
913 | cdev->device.class = &thermal_class; | |
914 | cdev->devdata = devdata; | |
915 | dev_set_name(&cdev->device, "cooling_device%d", cdev->id); | |
916 | result = device_register(&cdev->device); | |
917 | if (result) { | |
918 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
919 | kfree(cdev); | |
920 | return ERR_PTR(result); | |
921 | } | |
922 | ||
923 | /* sys I/F */ | |
924 | if (type) { | |
925 | result = device_create_file(&cdev->device, &dev_attr_cdev_type); | |
926 | if (result) | |
927 | goto unregister; | |
928 | } | |
929 | ||
930 | result = device_create_file(&cdev->device, &dev_attr_max_state); | |
931 | if (result) | |
932 | goto unregister; | |
933 | ||
934 | result = device_create_file(&cdev->device, &dev_attr_cur_state); | |
935 | if (result) | |
936 | goto unregister; | |
937 | ||
938 | mutex_lock(&thermal_list_lock); | |
939 | list_add(&cdev->node, &thermal_cdev_list); | |
940 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
941 | if (!pos->ops->bind) | |
942 | continue; | |
943 | result = pos->ops->bind(pos, cdev); | |
944 | if (result) | |
945 | break; | |
946 | ||
947 | } | |
948 | mutex_unlock(&thermal_list_lock); | |
949 | ||
950 | if (!result) | |
951 | return cdev; | |
952 | ||
953 | unregister: | |
954 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
955 | device_unregister(&cdev->device); | |
956 | return ERR_PTR(result); | |
957 | } | |
958 | EXPORT_SYMBOL(thermal_cooling_device_register); | |
959 | ||
960 | /** | |
961 | * thermal_cooling_device_unregister - removes the registered thermal cooling device | |
962 | * @cdev: the thermal cooling device to remove. | |
963 | * | |
964 | * thermal_cooling_device_unregister() must be called when the device is no | |
965 | * longer needed. | |
966 | */ | |
967 | void thermal_cooling_device_unregister(struct | |
968 | thermal_cooling_device | |
969 | *cdev) | |
970 | { | |
971 | struct thermal_zone_device *tz; | |
972 | struct thermal_cooling_device *pos = NULL; | |
973 | ||
974 | if (!cdev) | |
975 | return; | |
976 | ||
977 | mutex_lock(&thermal_list_lock); | |
978 | list_for_each_entry(pos, &thermal_cdev_list, node) | |
979 | if (pos == cdev) | |
980 | break; | |
981 | if (pos != cdev) { | |
982 | /* thermal cooling device not found */ | |
983 | mutex_unlock(&thermal_list_lock); | |
984 | return; | |
985 | } | |
986 | list_del(&cdev->node); | |
987 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
988 | if (!tz->ops->unbind) | |
989 | continue; | |
990 | tz->ops->unbind(tz, cdev); | |
991 | } | |
992 | mutex_unlock(&thermal_list_lock); | |
993 | if (cdev->type[0]) | |
994 | device_remove_file(&cdev->device, &dev_attr_cdev_type); | |
995 | device_remove_file(&cdev->device, &dev_attr_max_state); | |
996 | device_remove_file(&cdev->device, &dev_attr_cur_state); | |
997 | ||
998 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
999 | device_unregister(&cdev->device); | |
1000 | return; | |
1001 | } | |
1002 | EXPORT_SYMBOL(thermal_cooling_device_unregister); | |
1003 | ||
1004 | /** | |
1005 | * thermal_zone_device_update - force an update of a thermal zone's state | |
1006 | * @ttz: the thermal zone to update | |
1007 | */ | |
1008 | ||
1009 | void thermal_zone_device_update(struct thermal_zone_device *tz) | |
1010 | { | |
1011 | int count, ret = 0; | |
1012 | long temp, trip_temp; | |
1013 | enum thermal_trip_type trip_type; | |
1014 | struct thermal_cooling_device_instance *instance; | |
1015 | struct thermal_cooling_device *cdev; | |
1016 | ||
1017 | mutex_lock(&tz->lock); | |
1018 | ||
1019 | if (tz->ops->get_temp(tz, &temp)) { | |
1020 | /* get_temp failed - retry it later */ | |
1021 | pr_warn("failed to read out thermal zone %d\n", tz->id); | |
1022 | goto leave; | |
1023 | } | |
1024 | ||
1025 | for (count = 0; count < tz->trips; count++) { | |
1026 | tz->ops->get_trip_type(tz, count, &trip_type); | |
1027 | tz->ops->get_trip_temp(tz, count, &trip_temp); | |
1028 | ||
1029 | switch (trip_type) { | |
1030 | case THERMAL_TRIP_CRITICAL: | |
1031 | if (temp >= trip_temp) { | |
1032 | if (tz->ops->notify) | |
1033 | ret = tz->ops->notify(tz, count, | |
1034 | trip_type); | |
1035 | if (!ret) { | |
1036 | pr_emerg("Critical temperature reached (%ld C), shutting down\n", | |
1037 | temp/1000); | |
1038 | orderly_poweroff(true); | |
1039 | } | |
1040 | } | |
1041 | break; | |
1042 | case THERMAL_TRIP_HOT: | |
1043 | if (temp >= trip_temp) | |
1044 | if (tz->ops->notify) | |
1045 | tz->ops->notify(tz, count, trip_type); | |
1046 | break; | |
1047 | case THERMAL_TRIP_ACTIVE: | |
1048 | list_for_each_entry(instance, &tz->cooling_devices, | |
1049 | node) { | |
1050 | if (instance->trip != count) | |
1051 | continue; | |
1052 | ||
1053 | cdev = instance->cdev; | |
1054 | ||
1055 | if (temp >= trip_temp) | |
1056 | cdev->ops->set_cur_state(cdev, 1); | |
1057 | else | |
1058 | cdev->ops->set_cur_state(cdev, 0); | |
1059 | } | |
1060 | break; | |
1061 | case THERMAL_TRIP_PASSIVE: | |
1062 | if (temp >= trip_temp || tz->passive) | |
1063 | thermal_zone_device_passive(tz, temp, | |
1064 | trip_temp, count); | |
1065 | break; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | if (tz->forced_passive) | |
1070 | thermal_zone_device_passive(tz, temp, tz->forced_passive, | |
1071 | THERMAL_TRIPS_NONE); | |
1072 | ||
1073 | tz->last_temperature = temp; | |
1074 | ||
1075 | leave: | |
1076 | if (tz->passive) | |
1077 | thermal_zone_device_set_polling(tz, tz->passive_delay); | |
1078 | else if (tz->polling_delay) | |
1079 | thermal_zone_device_set_polling(tz, tz->polling_delay); | |
1080 | else | |
1081 | thermal_zone_device_set_polling(tz, 0); | |
1082 | mutex_unlock(&tz->lock); | |
1083 | } | |
1084 | EXPORT_SYMBOL(thermal_zone_device_update); | |
1085 | ||
1086 | /** | |
1087 | * create_trip_attrs - create attributes for trip points | |
1088 | * @tz: the thermal zone device | |
1089 | * @mask: Writeable trip point bitmap. | |
1090 | */ | |
1091 | static int create_trip_attrs(struct thermal_zone_device *tz, int mask) | |
1092 | { | |
1093 | int indx; | |
1094 | ||
1095 | tz->trip_type_attrs = | |
1096 | kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL); | |
1097 | if (!tz->trip_type_attrs) | |
1098 | return -ENOMEM; | |
1099 | ||
1100 | tz->trip_temp_attrs = | |
1101 | kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL); | |
1102 | if (!tz->trip_temp_attrs) { | |
1103 | kfree(tz->trip_type_attrs); | |
1104 | return -ENOMEM; | |
1105 | } | |
1106 | ||
1107 | for (indx = 0; indx < tz->trips; indx++) { | |
1108 | ||
1109 | /* create trip type attribute */ | |
1110 | snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, | |
1111 | "trip_point_%d_type", indx); | |
1112 | ||
1113 | sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); | |
1114 | tz->trip_type_attrs[indx].attr.attr.name = | |
1115 | tz->trip_type_attrs[indx].name; | |
1116 | tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; | |
1117 | tz->trip_type_attrs[indx].attr.show = trip_point_type_show; | |
1118 | ||
1119 | device_create_file(&tz->device, | |
1120 | &tz->trip_type_attrs[indx].attr); | |
1121 | ||
1122 | /* create trip temp attribute */ | |
1123 | snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH, | |
1124 | "trip_point_%d_temp", indx); | |
1125 | ||
1126 | sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr); | |
1127 | tz->trip_temp_attrs[indx].attr.attr.name = | |
1128 | tz->trip_temp_attrs[indx].name; | |
1129 | tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO; | |
1130 | tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show; | |
1131 | if (mask & (1 << indx)) { | |
1132 | tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; | |
1133 | tz->trip_temp_attrs[indx].attr.store = | |
1134 | trip_point_temp_store; | |
1135 | } | |
1136 | ||
1137 | device_create_file(&tz->device, | |
1138 | &tz->trip_temp_attrs[indx].attr); | |
1139 | } | |
1140 | return 0; | |
1141 | } | |
1142 | ||
1143 | static void remove_trip_attrs(struct thermal_zone_device *tz) | |
1144 | { | |
1145 | int indx; | |
1146 | ||
1147 | for (indx = 0; indx < tz->trips; indx++) { | |
1148 | device_remove_file(&tz->device, | |
1149 | &tz->trip_type_attrs[indx].attr); | |
1150 | device_remove_file(&tz->device, | |
1151 | &tz->trip_temp_attrs[indx].attr); | |
1152 | } | |
1153 | kfree(tz->trip_type_attrs); | |
1154 | kfree(tz->trip_temp_attrs); | |
1155 | } | |
1156 | ||
1157 | /** | |
1158 | * thermal_zone_device_register - register a new thermal zone device | |
1159 | * @type: the thermal zone device type | |
1160 | * @trips: the number of trip points the thermal zone support | |
1161 | * @mask: a bit string indicating the writeablility of trip points | |
1162 | * @devdata: private device data | |
1163 | * @ops: standard thermal zone device callbacks | |
1164 | * @tc1: thermal coefficient 1 for passive calculations | |
1165 | * @tc2: thermal coefficient 2 for passive calculations | |
1166 | * @passive_delay: number of milliseconds to wait between polls when | |
1167 | * performing passive cooling | |
1168 | * @polling_delay: number of milliseconds to wait between polls when checking | |
1169 | * whether trip points have been crossed (0 for interrupt | |
1170 | * driven systems) | |
1171 | * | |
1172 | * thermal_zone_device_unregister() must be called when the device is no | |
1173 | * longer needed. The passive cooling formula uses tc1 and tc2 as described in | |
1174 | * section 11.1.5.1 of the ACPI specification 3.0. | |
1175 | */ | |
1176 | struct thermal_zone_device *thermal_zone_device_register(char *type, | |
1177 | int trips, int mask, void *devdata, | |
1178 | const struct thermal_zone_device_ops *ops, | |
1179 | int tc1, int tc2, int passive_delay, int polling_delay) | |
1180 | { | |
1181 | struct thermal_zone_device *tz; | |
1182 | struct thermal_cooling_device *pos; | |
1183 | enum thermal_trip_type trip_type; | |
1184 | int result; | |
1185 | int count; | |
1186 | int passive = 0; | |
1187 | ||
1188 | if (strlen(type) >= THERMAL_NAME_LENGTH) | |
1189 | return ERR_PTR(-EINVAL); | |
1190 | ||
1191 | if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) | |
1192 | return ERR_PTR(-EINVAL); | |
1193 | ||
1194 | if (!ops || !ops->get_temp) | |
1195 | return ERR_PTR(-EINVAL); | |
1196 | ||
1197 | tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL); | |
1198 | if (!tz) | |
1199 | return ERR_PTR(-ENOMEM); | |
1200 | ||
1201 | INIT_LIST_HEAD(&tz->cooling_devices); | |
1202 | idr_init(&tz->idr); | |
1203 | mutex_init(&tz->lock); | |
1204 | result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id); | |
1205 | if (result) { | |
1206 | kfree(tz); | |
1207 | return ERR_PTR(result); | |
1208 | } | |
1209 | ||
1210 | strcpy(tz->type, type); | |
1211 | tz->ops = ops; | |
1212 | tz->device.class = &thermal_class; | |
1213 | tz->devdata = devdata; | |
1214 | tz->trips = trips; | |
1215 | tz->tc1 = tc1; | |
1216 | tz->tc2 = tc2; | |
1217 | tz->passive_delay = passive_delay; | |
1218 | tz->polling_delay = polling_delay; | |
1219 | ||
1220 | dev_set_name(&tz->device, "thermal_zone%d", tz->id); | |
1221 | result = device_register(&tz->device); | |
1222 | if (result) { | |
1223 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); | |
1224 | kfree(tz); | |
1225 | return ERR_PTR(result); | |
1226 | } | |
1227 | ||
1228 | /* sys I/F */ | |
1229 | if (type) { | |
1230 | result = device_create_file(&tz->device, &dev_attr_type); | |
1231 | if (result) | |
1232 | goto unregister; | |
1233 | } | |
1234 | ||
1235 | result = device_create_file(&tz->device, &dev_attr_temp); | |
1236 | if (result) | |
1237 | goto unregister; | |
1238 | ||
1239 | if (ops->get_mode) { | |
1240 | result = device_create_file(&tz->device, &dev_attr_mode); | |
1241 | if (result) | |
1242 | goto unregister; | |
1243 | } | |
1244 | ||
1245 | result = create_trip_attrs(tz, mask); | |
1246 | if (result) | |
1247 | goto unregister; | |
1248 | ||
1249 | for (count = 0; count < trips; count++) { | |
1250 | tz->ops->get_trip_type(tz, count, &trip_type); | |
1251 | if (trip_type == THERMAL_TRIP_PASSIVE) | |
1252 | passive = 1; | |
1253 | } | |
1254 | ||
1255 | if (!passive) | |
1256 | result = device_create_file(&tz->device, | |
1257 | &dev_attr_passive); | |
1258 | ||
1259 | if (result) | |
1260 | goto unregister; | |
1261 | ||
1262 | result = thermal_add_hwmon_sysfs(tz); | |
1263 | if (result) | |
1264 | goto unregister; | |
1265 | ||
1266 | mutex_lock(&thermal_list_lock); | |
1267 | list_add_tail(&tz->node, &thermal_tz_list); | |
1268 | if (ops->bind) | |
1269 | list_for_each_entry(pos, &thermal_cdev_list, node) { | |
1270 | result = ops->bind(tz, pos); | |
1271 | if (result) | |
1272 | break; | |
1273 | } | |
1274 | mutex_unlock(&thermal_list_lock); | |
1275 | ||
1276 | INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check); | |
1277 | ||
1278 | thermal_zone_device_update(tz); | |
1279 | ||
1280 | if (!result) | |
1281 | return tz; | |
1282 | ||
1283 | unregister: | |
1284 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); | |
1285 | device_unregister(&tz->device); | |
1286 | return ERR_PTR(result); | |
1287 | } | |
1288 | EXPORT_SYMBOL(thermal_zone_device_register); | |
1289 | ||
1290 | /** | |
1291 | * thermal_device_unregister - removes the registered thermal zone device | |
1292 | * @tz: the thermal zone device to remove | |
1293 | */ | |
1294 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) | |
1295 | { | |
1296 | struct thermal_cooling_device *cdev; | |
1297 | struct thermal_zone_device *pos = NULL; | |
1298 | ||
1299 | if (!tz) | |
1300 | return; | |
1301 | ||
1302 | mutex_lock(&thermal_list_lock); | |
1303 | list_for_each_entry(pos, &thermal_tz_list, node) | |
1304 | if (pos == tz) | |
1305 | break; | |
1306 | if (pos != tz) { | |
1307 | /* thermal zone device not found */ | |
1308 | mutex_unlock(&thermal_list_lock); | |
1309 | return; | |
1310 | } | |
1311 | list_del(&tz->node); | |
1312 | if (tz->ops->unbind) | |
1313 | list_for_each_entry(cdev, &thermal_cdev_list, node) | |
1314 | tz->ops->unbind(tz, cdev); | |
1315 | mutex_unlock(&thermal_list_lock); | |
1316 | ||
1317 | thermal_zone_device_set_polling(tz, 0); | |
1318 | ||
1319 | if (tz->type[0]) | |
1320 | device_remove_file(&tz->device, &dev_attr_type); | |
1321 | device_remove_file(&tz->device, &dev_attr_temp); | |
1322 | if (tz->ops->get_mode) | |
1323 | device_remove_file(&tz->device, &dev_attr_mode); | |
1324 | remove_trip_attrs(tz); | |
1325 | ||
1326 | thermal_remove_hwmon_sysfs(tz); | |
1327 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); | |
1328 | idr_destroy(&tz->idr); | |
1329 | mutex_destroy(&tz->lock); | |
1330 | device_unregister(&tz->device); | |
1331 | return; | |
1332 | } | |
1333 | EXPORT_SYMBOL(thermal_zone_device_unregister); | |
1334 | ||
1335 | #ifdef CONFIG_NET | |
1336 | static struct genl_family thermal_event_genl_family = { | |
1337 | .id = GENL_ID_GENERATE, | |
1338 | .name = THERMAL_GENL_FAMILY_NAME, | |
1339 | .version = THERMAL_GENL_VERSION, | |
1340 | .maxattr = THERMAL_GENL_ATTR_MAX, | |
1341 | }; | |
1342 | ||
1343 | static struct genl_multicast_group thermal_event_mcgrp = { | |
1344 | .name = THERMAL_GENL_MCAST_GROUP_NAME, | |
1345 | }; | |
1346 | ||
1347 | int thermal_generate_netlink_event(u32 orig, enum events event) | |
1348 | { | |
1349 | struct sk_buff *skb; | |
1350 | struct nlattr *attr; | |
1351 | struct thermal_genl_event *thermal_event; | |
1352 | void *msg_header; | |
1353 | int size; | |
1354 | int result; | |
1355 | static unsigned int thermal_event_seqnum; | |
1356 | ||
1357 | /* allocate memory */ | |
1358 | size = nla_total_size(sizeof(struct thermal_genl_event)) + | |
1359 | nla_total_size(0); | |
1360 | ||
1361 | skb = genlmsg_new(size, GFP_ATOMIC); | |
1362 | if (!skb) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | /* add the genetlink message header */ | |
1366 | msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++, | |
1367 | &thermal_event_genl_family, 0, | |
1368 | THERMAL_GENL_CMD_EVENT); | |
1369 | if (!msg_header) { | |
1370 | nlmsg_free(skb); | |
1371 | return -ENOMEM; | |
1372 | } | |
1373 | ||
1374 | /* fill the data */ | |
1375 | attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, | |
1376 | sizeof(struct thermal_genl_event)); | |
1377 | ||
1378 | if (!attr) { | |
1379 | nlmsg_free(skb); | |
1380 | return -EINVAL; | |
1381 | } | |
1382 | ||
1383 | thermal_event = nla_data(attr); | |
1384 | if (!thermal_event) { | |
1385 | nlmsg_free(skb); | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | ||
1389 | memset(thermal_event, 0, sizeof(struct thermal_genl_event)); | |
1390 | ||
1391 | thermal_event->orig = orig; | |
1392 | thermal_event->event = event; | |
1393 | ||
1394 | /* send multicast genetlink message */ | |
1395 | result = genlmsg_end(skb, msg_header); | |
1396 | if (result < 0) { | |
1397 | nlmsg_free(skb); | |
1398 | return result; | |
1399 | } | |
1400 | ||
1401 | result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC); | |
1402 | if (result) | |
1403 | pr_info("failed to send netlink event:%d\n", result); | |
1404 | ||
1405 | return result; | |
1406 | } | |
1407 | EXPORT_SYMBOL(thermal_generate_netlink_event); | |
1408 | ||
1409 | static int genetlink_init(void) | |
1410 | { | |
1411 | int result; | |
1412 | ||
1413 | result = genl_register_family(&thermal_event_genl_family); | |
1414 | if (result) | |
1415 | return result; | |
1416 | ||
1417 | result = genl_register_mc_group(&thermal_event_genl_family, | |
1418 | &thermal_event_mcgrp); | |
1419 | if (result) | |
1420 | genl_unregister_family(&thermal_event_genl_family); | |
1421 | return result; | |
1422 | } | |
1423 | ||
1424 | static void genetlink_exit(void) | |
1425 | { | |
1426 | genl_unregister_family(&thermal_event_genl_family); | |
1427 | } | |
1428 | #else /* !CONFIG_NET */ | |
1429 | static inline int genetlink_init(void) { return 0; } | |
1430 | static inline void genetlink_exit(void) {} | |
1431 | #endif /* !CONFIG_NET */ | |
1432 | ||
1433 | static int __init thermal_init(void) | |
1434 | { | |
1435 | int result = 0; | |
1436 | ||
1437 | result = class_register(&thermal_class); | |
1438 | if (result) { | |
1439 | idr_destroy(&thermal_tz_idr); | |
1440 | idr_destroy(&thermal_cdev_idr); | |
1441 | mutex_destroy(&thermal_idr_lock); | |
1442 | mutex_destroy(&thermal_list_lock); | |
1443 | } | |
1444 | result = genetlink_init(); | |
1445 | return result; | |
1446 | } | |
1447 | ||
1448 | static void __exit thermal_exit(void) | |
1449 | { | |
1450 | class_unregister(&thermal_class); | |
1451 | idr_destroy(&thermal_tz_idr); | |
1452 | idr_destroy(&thermal_cdev_idr); | |
1453 | mutex_destroy(&thermal_idr_lock); | |
1454 | mutex_destroy(&thermal_list_lock); | |
1455 | genetlink_exit(); | |
1456 | } | |
1457 | ||
1458 | fs_initcall(thermal_init); | |
1459 | module_exit(thermal_exit); |