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203d3d4a ZR |
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 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/kdev_t.h> | |
30 | #include <linux/idr.h> | |
31 | #include <linux/thermal.h> | |
32 | #include <linux/spinlock.h> | |
33 | ||
63c4ec90 | 34 | MODULE_AUTHOR("Zhang Rui"); |
203d3d4a ZR |
35 | MODULE_DESCRIPTION("Generic thermal management sysfs support"); |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | #define PREFIX "Thermal: " | |
39 | ||
40 | struct thermal_cooling_device_instance { | |
41 | int id; | |
42 | char name[THERMAL_NAME_LENGTH]; | |
43 | struct thermal_zone_device *tz; | |
44 | struct thermal_cooling_device *cdev; | |
45 | int trip; | |
46 | char attr_name[THERMAL_NAME_LENGTH]; | |
47 | struct device_attribute attr; | |
48 | struct list_head node; | |
49 | }; | |
50 | ||
51 | static DEFINE_IDR(thermal_tz_idr); | |
52 | static DEFINE_IDR(thermal_cdev_idr); | |
53 | static DEFINE_MUTEX(thermal_idr_lock); | |
54 | ||
55 | static LIST_HEAD(thermal_tz_list); | |
56 | static LIST_HEAD(thermal_cdev_list); | |
57 | static DEFINE_MUTEX(thermal_list_lock); | |
58 | ||
59 | static int get_idr(struct idr *idr, struct mutex *lock, int *id) | |
60 | { | |
61 | int err; | |
62 | ||
63 | again: | |
64 | if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0)) | |
65 | return -ENOMEM; | |
66 | ||
67 | if (lock) | |
68 | mutex_lock(lock); | |
69 | err = idr_get_new(idr, NULL, id); | |
70 | if (lock) | |
71 | mutex_unlock(lock); | |
72 | if (unlikely(err == -EAGAIN)) | |
73 | goto again; | |
74 | else if (unlikely(err)) | |
75 | return err; | |
76 | ||
77 | *id = *id & MAX_ID_MASK; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void release_idr(struct idr *idr, struct mutex *lock, int id) | |
82 | { | |
83 | if (lock) | |
84 | mutex_lock(lock); | |
85 | idr_remove(idr, id); | |
86 | if (lock) | |
87 | mutex_unlock(lock); | |
88 | } | |
89 | ||
90 | /* sys I/F for thermal zone */ | |
91 | ||
92 | #define to_thermal_zone(_dev) \ | |
93 | container_of(_dev, struct thermal_zone_device, device) | |
94 | ||
95 | static ssize_t | |
96 | type_show(struct device *dev, struct device_attribute *attr, char *buf) | |
97 | { | |
98 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
99 | ||
100 | return sprintf(buf, "%s\n", tz->type); | |
101 | } | |
102 | ||
103 | static ssize_t | |
104 | temp_show(struct device *dev, struct device_attribute *attr, char *buf) | |
105 | { | |
106 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
107 | ||
108 | if (!tz->ops->get_temp) | |
109 | return -EPERM; | |
110 | ||
111 | return tz->ops->get_temp(tz, buf); | |
112 | } | |
113 | ||
114 | static ssize_t | |
115 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) | |
116 | { | |
117 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
118 | ||
119 | if (!tz->ops->get_mode) | |
120 | return -EPERM; | |
121 | ||
122 | return tz->ops->get_mode(tz, buf); | |
123 | } | |
124 | ||
125 | static ssize_t | |
126 | mode_store(struct device *dev, struct device_attribute *attr, | |
127 | const char *buf, size_t count) | |
128 | { | |
129 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
130 | int result; | |
131 | ||
132 | if (!tz->ops->set_mode) | |
133 | return -EPERM; | |
134 | ||
135 | result = tz->ops->set_mode(tz, buf); | |
136 | if (result) | |
137 | return result; | |
138 | ||
139 | return count; | |
140 | } | |
141 | ||
142 | static ssize_t | |
143 | trip_point_type_show(struct device *dev, struct device_attribute *attr, | |
144 | char *buf) | |
145 | { | |
146 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
147 | int trip; | |
148 | ||
149 | if (!tz->ops->get_trip_type) | |
150 | return -EPERM; | |
151 | ||
152 | if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip)) | |
153 | return -EINVAL; | |
154 | ||
155 | return tz->ops->get_trip_type(tz, trip, buf); | |
156 | } | |
157 | ||
158 | static ssize_t | |
159 | trip_point_temp_show(struct device *dev, struct device_attribute *attr, | |
160 | char *buf) | |
161 | { | |
162 | struct thermal_zone_device *tz = to_thermal_zone(dev); | |
163 | int trip; | |
164 | ||
165 | if (!tz->ops->get_trip_temp) | |
166 | return -EPERM; | |
167 | ||
168 | if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) | |
169 | return -EINVAL; | |
170 | ||
171 | return tz->ops->get_trip_temp(tz, trip, buf); | |
172 | } | |
173 | ||
174 | static DEVICE_ATTR(type, 0444, type_show, NULL); | |
175 | static DEVICE_ATTR(temp, 0444, temp_show, NULL); | |
176 | static DEVICE_ATTR(mode, 0644, mode_show, mode_store); | |
177 | ||
178 | static struct device_attribute trip_point_attrs[] = { | |
179 | __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL), | |
180 | __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL), | |
181 | __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL), | |
182 | __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL), | |
183 | __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL), | |
184 | __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL), | |
185 | __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL), | |
186 | __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL), | |
187 | __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL), | |
188 | __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL), | |
189 | __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL), | |
190 | __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL), | |
191 | __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL), | |
192 | __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL), | |
193 | __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL), | |
194 | __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL), | |
195 | __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL), | |
196 | __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL), | |
197 | __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL), | |
198 | __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL), | |
5f1a3f2a KH |
199 | __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL), |
200 | __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL), | |
201 | __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL), | |
202 | __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL), | |
203d3d4a ZR |
203 | }; |
204 | ||
205 | #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \ | |
206 | do { \ | |
207 | result = device_create_file(_dev, \ | |
208 | &trip_point_attrs[_index * 2]); \ | |
209 | if (result) \ | |
210 | break; \ | |
211 | result = device_create_file(_dev, \ | |
212 | &trip_point_attrs[_index * 2 + 1]); \ | |
213 | } while (0) | |
214 | ||
215 | #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \ | |
216 | do { \ | |
217 | device_remove_file(_dev, &trip_point_attrs[_index * 2]); \ | |
218 | device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \ | |
219 | } while (0) | |
220 | ||
221 | /* sys I/F for cooling device */ | |
222 | #define to_cooling_device(_dev) \ | |
223 | container_of(_dev, struct thermal_cooling_device, device) | |
224 | ||
225 | static ssize_t | |
226 | thermal_cooling_device_type_show(struct device *dev, | |
227 | struct device_attribute *attr, char *buf) | |
228 | { | |
229 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
230 | ||
231 | return sprintf(buf, "%s\n", cdev->type); | |
232 | } | |
233 | ||
234 | static ssize_t | |
235 | thermal_cooling_device_max_state_show(struct device *dev, | |
236 | struct device_attribute *attr, char *buf) | |
237 | { | |
238 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
239 | ||
240 | return cdev->ops->get_max_state(cdev, buf); | |
241 | } | |
242 | ||
243 | static ssize_t | |
244 | thermal_cooling_device_cur_state_show(struct device *dev, | |
245 | struct device_attribute *attr, char *buf) | |
246 | { | |
247 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
248 | ||
249 | return cdev->ops->get_cur_state(cdev, buf); | |
250 | } | |
251 | ||
252 | static ssize_t | |
253 | thermal_cooling_device_cur_state_store(struct device *dev, | |
254 | struct device_attribute *attr, | |
255 | const char *buf, size_t count) | |
256 | { | |
257 | struct thermal_cooling_device *cdev = to_cooling_device(dev); | |
258 | int state; | |
259 | int result; | |
260 | ||
261 | if (!sscanf(buf, "%d\n", &state)) | |
262 | return -EINVAL; | |
263 | ||
264 | if (state < 0) | |
265 | return -EINVAL; | |
266 | ||
267 | result = cdev->ops->set_cur_state(cdev, state); | |
268 | if (result) | |
269 | return result; | |
270 | return count; | |
271 | } | |
272 | ||
273 | static struct device_attribute dev_attr_cdev_type = | |
543a9561 | 274 | __ATTR(type, 0444, thermal_cooling_device_type_show, NULL); |
203d3d4a ZR |
275 | static DEVICE_ATTR(max_state, 0444, |
276 | thermal_cooling_device_max_state_show, NULL); | |
277 | static DEVICE_ATTR(cur_state, 0644, | |
278 | thermal_cooling_device_cur_state_show, | |
279 | thermal_cooling_device_cur_state_store); | |
280 | ||
281 | static ssize_t | |
282 | thermal_cooling_device_trip_point_show(struct device *dev, | |
543a9561 | 283 | struct device_attribute *attr, char *buf) |
203d3d4a ZR |
284 | { |
285 | struct thermal_cooling_device_instance *instance; | |
286 | ||
287 | instance = | |
288 | container_of(attr, struct thermal_cooling_device_instance, attr); | |
289 | ||
290 | if (instance->trip == THERMAL_TRIPS_NONE) | |
291 | return sprintf(buf, "-1\n"); | |
292 | else | |
293 | return sprintf(buf, "%d\n", instance->trip); | |
294 | } | |
295 | ||
296 | /* Device management */ | |
297 | ||
e68b16ab ZR |
298 | #if defined(CONFIG_HWMON) || \ |
299 | (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE)) | |
300 | /* hwmon sys I/F */ | |
301 | #include <linux/hwmon.h> | |
302 | static LIST_HEAD(thermal_hwmon_list); | |
303 | ||
304 | static ssize_t | |
305 | name_show(struct device *dev, struct device_attribute *attr, char *buf) | |
306 | { | |
307 | struct thermal_hwmon_device *hwmon = dev->driver_data; | |
308 | return sprintf(buf, "%s\n", hwmon->type); | |
309 | } | |
310 | static DEVICE_ATTR(name, 0444, name_show, NULL); | |
311 | ||
312 | static ssize_t | |
313 | temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) | |
314 | { | |
315 | struct thermal_hwmon_attr *hwmon_attr | |
316 | = container_of(attr, struct thermal_hwmon_attr, attr); | |
317 | struct thermal_zone_device *tz | |
318 | = container_of(hwmon_attr, struct thermal_zone_device, | |
319 | temp_input); | |
320 | ||
321 | return tz->ops->get_temp(tz, buf); | |
322 | } | |
323 | ||
324 | static ssize_t | |
325 | temp_crit_show(struct device *dev, struct device_attribute *attr, | |
326 | char *buf) | |
327 | { | |
328 | struct thermal_hwmon_attr *hwmon_attr | |
329 | = container_of(attr, struct thermal_hwmon_attr, attr); | |
330 | struct thermal_zone_device *tz | |
331 | = container_of(hwmon_attr, struct thermal_zone_device, | |
332 | temp_crit); | |
333 | ||
334 | return tz->ops->get_trip_temp(tz, 0, buf); | |
335 | } | |
336 | ||
337 | ||
338 | static int | |
339 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) | |
340 | { | |
341 | struct thermal_hwmon_device *hwmon; | |
342 | int new_hwmon_device = 1; | |
343 | int result; | |
344 | ||
345 | mutex_lock(&thermal_list_lock); | |
346 | list_for_each_entry(hwmon, &thermal_hwmon_list, node) | |
347 | if (!strcmp(hwmon->type, tz->type)) { | |
348 | new_hwmon_device = 0; | |
349 | mutex_unlock(&thermal_list_lock); | |
350 | goto register_sys_interface; | |
351 | } | |
352 | mutex_unlock(&thermal_list_lock); | |
353 | ||
354 | hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL); | |
355 | if (!hwmon) | |
356 | return -ENOMEM; | |
357 | ||
358 | INIT_LIST_HEAD(&hwmon->tz_list); | |
359 | strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH); | |
360 | hwmon->device = hwmon_device_register(NULL); | |
361 | if (IS_ERR(hwmon->device)) { | |
362 | result = PTR_ERR(hwmon->device); | |
363 | goto free_mem; | |
364 | } | |
365 | hwmon->device->driver_data = hwmon; | |
366 | result = device_create_file(hwmon->device, &dev_attr_name); | |
367 | if (result) | |
368 | goto unregister_hwmon_device; | |
369 | ||
370 | register_sys_interface: | |
371 | tz->hwmon = hwmon; | |
372 | hwmon->count++; | |
373 | ||
374 | snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH, | |
375 | "temp%d_input", hwmon->count); | |
376 | tz->temp_input.attr.attr.name = tz->temp_input.name; | |
377 | tz->temp_input.attr.attr.mode = 0444; | |
378 | tz->temp_input.attr.show = temp_input_show; | |
379 | result = device_create_file(hwmon->device, &tz->temp_input.attr); | |
380 | if (result) | |
381 | goto unregister_hwmon_device; | |
382 | ||
383 | if (tz->ops->get_crit_temp) { | |
384 | unsigned long temperature; | |
385 | if (!tz->ops->get_crit_temp(tz, &temperature)) { | |
386 | snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH, | |
387 | "temp%d_crit", hwmon->count); | |
388 | tz->temp_crit.attr.attr.name = tz->temp_crit.name; | |
389 | tz->temp_crit.attr.attr.mode = 0444; | |
390 | tz->temp_crit.attr.show = temp_crit_show; | |
391 | result = device_create_file(hwmon->device, | |
392 | &tz->temp_crit.attr); | |
393 | if (result) | |
394 | goto unregister_hwmon_device; | |
395 | } | |
396 | } | |
397 | ||
398 | mutex_lock(&thermal_list_lock); | |
399 | if (new_hwmon_device) | |
400 | list_add_tail(&hwmon->node, &thermal_hwmon_list); | |
401 | list_add_tail(&tz->hwmon_node, &hwmon->tz_list); | |
402 | mutex_unlock(&thermal_list_lock); | |
403 | ||
404 | return 0; | |
405 | ||
406 | unregister_hwmon_device: | |
407 | device_remove_file(hwmon->device, &tz->temp_crit.attr); | |
408 | device_remove_file(hwmon->device, &tz->temp_input.attr); | |
409 | if (new_hwmon_device) { | |
410 | device_remove_file(hwmon->device, &dev_attr_name); | |
411 | hwmon_device_unregister(hwmon->device); | |
412 | } | |
413 | free_mem: | |
414 | if (new_hwmon_device) | |
415 | kfree(hwmon); | |
416 | ||
417 | return result; | |
418 | } | |
419 | ||
420 | static void | |
421 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) | |
422 | { | |
423 | struct thermal_hwmon_device *hwmon = tz->hwmon; | |
424 | ||
425 | tz->hwmon = NULL; | |
426 | device_remove_file(hwmon->device, &tz->temp_input.attr); | |
427 | device_remove_file(hwmon->device, &tz->temp_crit.attr); | |
428 | ||
429 | mutex_lock(&thermal_list_lock); | |
430 | list_del(&tz->hwmon_node); | |
431 | if (!list_empty(&hwmon->tz_list)) { | |
432 | mutex_unlock(&thermal_list_lock); | |
433 | return; | |
434 | } | |
435 | list_del(&hwmon->node); | |
436 | mutex_unlock(&thermal_list_lock); | |
437 | ||
438 | device_remove_file(hwmon->device, &dev_attr_name); | |
439 | hwmon_device_unregister(hwmon->device); | |
440 | kfree(hwmon); | |
441 | } | |
442 | #else | |
443 | static int | |
444 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) | |
445 | { | |
446 | return 0; | |
447 | } | |
448 | ||
449 | static void | |
450 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) | |
451 | { | |
452 | } | |
453 | #endif | |
454 | ||
455 | ||
203d3d4a ZR |
456 | /** |
457 | * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone | |
203d3d4a ZR |
458 | * @tz: thermal zone device |
459 | * @trip: indicates which trip point the cooling devices is | |
460 | * associated with in this thermal zone. | |
461 | * @cdev: thermal cooling device | |
543a9561 LB |
462 | * |
463 | * This function is usually called in the thermal zone device .bind callback. | |
203d3d4a ZR |
464 | */ |
465 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, | |
466 | int trip, | |
467 | struct thermal_cooling_device *cdev) | |
468 | { | |
469 | struct thermal_cooling_device_instance *dev; | |
470 | struct thermal_cooling_device_instance *pos; | |
c7516709 TS |
471 | struct thermal_zone_device *pos1; |
472 | struct thermal_cooling_device *pos2; | |
203d3d4a ZR |
473 | int result; |
474 | ||
543a9561 | 475 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) |
203d3d4a ZR |
476 | return -EINVAL; |
477 | ||
c7516709 TS |
478 | list_for_each_entry(pos1, &thermal_tz_list, node) { |
479 | if (pos1 == tz) | |
480 | break; | |
481 | } | |
482 | list_for_each_entry(pos2, &thermal_cdev_list, node) { | |
483 | if (pos2 == cdev) | |
484 | break; | |
485 | } | |
486 | ||
487 | if (tz != pos1 || cdev != pos2) | |
203d3d4a ZR |
488 | return -EINVAL; |
489 | ||
490 | dev = | |
491 | kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL); | |
492 | if (!dev) | |
493 | return -ENOMEM; | |
494 | dev->tz = tz; | |
495 | dev->cdev = cdev; | |
496 | dev->trip = trip; | |
497 | result = get_idr(&tz->idr, &tz->lock, &dev->id); | |
498 | if (result) | |
499 | goto free_mem; | |
500 | ||
501 | sprintf(dev->name, "cdev%d", dev->id); | |
502 | result = | |
503 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); | |
504 | if (result) | |
505 | goto release_idr; | |
506 | ||
507 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); | |
508 | dev->attr.attr.name = dev->attr_name; | |
509 | dev->attr.attr.mode = 0444; | |
510 | dev->attr.show = thermal_cooling_device_trip_point_show; | |
511 | result = device_create_file(&tz->device, &dev->attr); | |
512 | if (result) | |
513 | goto remove_symbol_link; | |
514 | ||
515 | mutex_lock(&tz->lock); | |
516 | list_for_each_entry(pos, &tz->cooling_devices, node) | |
517 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { | |
518 | result = -EEXIST; | |
519 | break; | |
520 | } | |
521 | if (!result) | |
522 | list_add_tail(&dev->node, &tz->cooling_devices); | |
523 | mutex_unlock(&tz->lock); | |
524 | ||
525 | if (!result) | |
526 | return 0; | |
527 | ||
528 | device_remove_file(&tz->device, &dev->attr); | |
529 | remove_symbol_link: | |
530 | sysfs_remove_link(&tz->device.kobj, dev->name); | |
531 | release_idr: | |
532 | release_idr(&tz->idr, &tz->lock, dev->id); | |
533 | free_mem: | |
534 | kfree(dev); | |
535 | return result; | |
536 | } | |
543a9561 | 537 | |
203d3d4a ZR |
538 | EXPORT_SYMBOL(thermal_zone_bind_cooling_device); |
539 | ||
540 | /** | |
541 | * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone | |
203d3d4a ZR |
542 | * @tz: thermal zone device |
543 | * @trip: indicates which trip point the cooling devices is | |
544 | * associated with in this thermal zone. | |
545 | * @cdev: thermal cooling device | |
543a9561 LB |
546 | * |
547 | * This function is usually called in the thermal zone device .unbind callback. | |
203d3d4a ZR |
548 | */ |
549 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, | |
550 | int trip, | |
551 | struct thermal_cooling_device *cdev) | |
552 | { | |
553 | struct thermal_cooling_device_instance *pos, *next; | |
554 | ||
555 | mutex_lock(&tz->lock); | |
556 | list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) { | |
543a9561 | 557 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
203d3d4a ZR |
558 | list_del(&pos->node); |
559 | mutex_unlock(&tz->lock); | |
560 | goto unbind; | |
561 | } | |
562 | } | |
563 | mutex_unlock(&tz->lock); | |
564 | ||
565 | return -ENODEV; | |
566 | ||
567 | unbind: | |
568 | device_remove_file(&tz->device, &pos->attr); | |
569 | sysfs_remove_link(&tz->device.kobj, pos->name); | |
570 | release_idr(&tz->idr, &tz->lock, pos->id); | |
571 | kfree(pos); | |
572 | return 0; | |
573 | } | |
543a9561 | 574 | |
203d3d4a ZR |
575 | EXPORT_SYMBOL(thermal_zone_unbind_cooling_device); |
576 | ||
577 | static void thermal_release(struct device *dev) | |
578 | { | |
579 | struct thermal_zone_device *tz; | |
580 | struct thermal_cooling_device *cdev; | |
581 | ||
582 | if (!strncmp(dev->bus_id, "thermal_zone", sizeof "thermal_zone" - 1)) { | |
583 | tz = to_thermal_zone(dev); | |
584 | kfree(tz); | |
585 | } else { | |
586 | cdev = to_cooling_device(dev); | |
587 | kfree(cdev); | |
588 | } | |
589 | } | |
590 | ||
591 | static struct class thermal_class = { | |
592 | .name = "thermal", | |
593 | .dev_release = thermal_release, | |
594 | }; | |
595 | ||
596 | /** | |
597 | * thermal_cooling_device_register - register a new thermal cooling device | |
598 | * @type: the thermal cooling device type. | |
599 | * @devdata: device private data. | |
600 | * @ops: standard thermal cooling devices callbacks. | |
601 | */ | |
602 | struct thermal_cooling_device *thermal_cooling_device_register(char *type, | |
543a9561 LB |
603 | void *devdata, |
604 | struct | |
605 | thermal_cooling_device_ops | |
606 | *ops) | |
203d3d4a ZR |
607 | { |
608 | struct thermal_cooling_device *cdev; | |
609 | struct thermal_zone_device *pos; | |
610 | int result; | |
611 | ||
612 | if (strlen(type) >= THERMAL_NAME_LENGTH) | |
3e6fda5c | 613 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
614 | |
615 | if (!ops || !ops->get_max_state || !ops->get_cur_state || | |
543a9561 | 616 | !ops->set_cur_state) |
3e6fda5c | 617 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
618 | |
619 | cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL); | |
620 | if (!cdev) | |
3e6fda5c | 621 | return ERR_PTR(-ENOMEM); |
203d3d4a ZR |
622 | |
623 | result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id); | |
624 | if (result) { | |
625 | kfree(cdev); | |
3e6fda5c | 626 | return ERR_PTR(result); |
203d3d4a ZR |
627 | } |
628 | ||
629 | strcpy(cdev->type, type); | |
630 | cdev->ops = ops; | |
631 | cdev->device.class = &thermal_class; | |
632 | cdev->devdata = devdata; | |
633 | sprintf(cdev->device.bus_id, "cooling_device%d", cdev->id); | |
634 | result = device_register(&cdev->device); | |
635 | if (result) { | |
636 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
637 | kfree(cdev); | |
3e6fda5c | 638 | return ERR_PTR(result); |
203d3d4a ZR |
639 | } |
640 | ||
641 | /* sys I/F */ | |
642 | if (type) { | |
543a9561 | 643 | result = device_create_file(&cdev->device, &dev_attr_cdev_type); |
203d3d4a ZR |
644 | if (result) |
645 | goto unregister; | |
646 | } | |
647 | ||
648 | result = device_create_file(&cdev->device, &dev_attr_max_state); | |
649 | if (result) | |
650 | goto unregister; | |
651 | ||
652 | result = device_create_file(&cdev->device, &dev_attr_cur_state); | |
653 | if (result) | |
654 | goto unregister; | |
655 | ||
656 | mutex_lock(&thermal_list_lock); | |
657 | list_add(&cdev->node, &thermal_cdev_list); | |
658 | list_for_each_entry(pos, &thermal_tz_list, node) { | |
659 | if (!pos->ops->bind) | |
660 | continue; | |
661 | result = pos->ops->bind(pos, cdev); | |
662 | if (result) | |
663 | break; | |
664 | ||
665 | } | |
666 | mutex_unlock(&thermal_list_lock); | |
667 | ||
668 | if (!result) | |
669 | return cdev; | |
670 | ||
671 | unregister: | |
672 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
673 | device_unregister(&cdev->device); | |
3e6fda5c | 674 | return ERR_PTR(result); |
203d3d4a | 675 | } |
543a9561 | 676 | |
203d3d4a ZR |
677 | EXPORT_SYMBOL(thermal_cooling_device_register); |
678 | ||
679 | /** | |
680 | * thermal_cooling_device_unregister - removes the registered thermal cooling device | |
203d3d4a ZR |
681 | * @cdev: the thermal cooling device to remove. |
682 | * | |
683 | * thermal_cooling_device_unregister() must be called when the device is no | |
684 | * longer needed. | |
685 | */ | |
686 | void thermal_cooling_device_unregister(struct | |
687 | thermal_cooling_device | |
688 | *cdev) | |
689 | { | |
690 | struct thermal_zone_device *tz; | |
691 | struct thermal_cooling_device *pos = NULL; | |
692 | ||
693 | if (!cdev) | |
694 | return; | |
695 | ||
696 | mutex_lock(&thermal_list_lock); | |
697 | list_for_each_entry(pos, &thermal_cdev_list, node) | |
698 | if (pos == cdev) | |
699 | break; | |
700 | if (pos != cdev) { | |
701 | /* thermal cooling device not found */ | |
702 | mutex_unlock(&thermal_list_lock); | |
703 | return; | |
704 | } | |
705 | list_del(&cdev->node); | |
706 | list_for_each_entry(tz, &thermal_tz_list, node) { | |
707 | if (!tz->ops->unbind) | |
708 | continue; | |
709 | tz->ops->unbind(tz, cdev); | |
710 | } | |
711 | mutex_unlock(&thermal_list_lock); | |
712 | if (cdev->type[0]) | |
543a9561 | 713 | device_remove_file(&cdev->device, &dev_attr_cdev_type); |
203d3d4a ZR |
714 | device_remove_file(&cdev->device, &dev_attr_max_state); |
715 | device_remove_file(&cdev->device, &dev_attr_cur_state); | |
716 | ||
717 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); | |
718 | device_unregister(&cdev->device); | |
719 | return; | |
720 | } | |
543a9561 | 721 | |
203d3d4a ZR |
722 | EXPORT_SYMBOL(thermal_cooling_device_unregister); |
723 | ||
724 | /** | |
725 | * thermal_zone_device_register - register a new thermal zone device | |
726 | * @type: the thermal zone device type | |
727 | * @trips: the number of trip points the thermal zone support | |
728 | * @devdata: private device data | |
729 | * @ops: standard thermal zone device callbacks | |
730 | * | |
731 | * thermal_zone_device_unregister() must be called when the device is no | |
732 | * longer needed. | |
733 | */ | |
734 | struct thermal_zone_device *thermal_zone_device_register(char *type, | |
543a9561 LB |
735 | int trips, |
736 | void *devdata, struct | |
737 | thermal_zone_device_ops | |
738 | *ops) | |
203d3d4a ZR |
739 | { |
740 | struct thermal_zone_device *tz; | |
741 | struct thermal_cooling_device *pos; | |
742 | int result; | |
743 | int count; | |
744 | ||
745 | if (strlen(type) >= THERMAL_NAME_LENGTH) | |
3e6fda5c | 746 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
747 | |
748 | if (trips > THERMAL_MAX_TRIPS || trips < 0) | |
3e6fda5c | 749 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
750 | |
751 | if (!ops || !ops->get_temp) | |
3e6fda5c | 752 | return ERR_PTR(-EINVAL); |
203d3d4a ZR |
753 | |
754 | tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL); | |
755 | if (!tz) | |
3e6fda5c | 756 | return ERR_PTR(-ENOMEM); |
203d3d4a ZR |
757 | |
758 | INIT_LIST_HEAD(&tz->cooling_devices); | |
759 | idr_init(&tz->idr); | |
760 | mutex_init(&tz->lock); | |
761 | result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id); | |
762 | if (result) { | |
763 | kfree(tz); | |
3e6fda5c | 764 | return ERR_PTR(result); |
203d3d4a ZR |
765 | } |
766 | ||
767 | strcpy(tz->type, type); | |
768 | tz->ops = ops; | |
769 | tz->device.class = &thermal_class; | |
770 | tz->devdata = devdata; | |
771 | tz->trips = trips; | |
772 | sprintf(tz->device.bus_id, "thermal_zone%d", tz->id); | |
773 | result = device_register(&tz->device); | |
774 | if (result) { | |
775 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); | |
776 | kfree(tz); | |
3e6fda5c | 777 | return ERR_PTR(result); |
203d3d4a ZR |
778 | } |
779 | ||
780 | /* sys I/F */ | |
781 | if (type) { | |
782 | result = device_create_file(&tz->device, &dev_attr_type); | |
783 | if (result) | |
784 | goto unregister; | |
785 | } | |
786 | ||
787 | result = device_create_file(&tz->device, &dev_attr_temp); | |
788 | if (result) | |
789 | goto unregister; | |
790 | ||
791 | if (ops->get_mode) { | |
792 | result = device_create_file(&tz->device, &dev_attr_mode); | |
793 | if (result) | |
794 | goto unregister; | |
795 | } | |
796 | ||
797 | for (count = 0; count < trips; count++) { | |
798 | TRIP_POINT_ATTR_ADD(&tz->device, count, result); | |
799 | if (result) | |
800 | goto unregister; | |
801 | } | |
802 | ||
e68b16ab ZR |
803 | result = thermal_add_hwmon_sysfs(tz); |
804 | if (result) | |
805 | goto unregister; | |
806 | ||
203d3d4a ZR |
807 | mutex_lock(&thermal_list_lock); |
808 | list_add_tail(&tz->node, &thermal_tz_list); | |
809 | if (ops->bind) | |
810 | list_for_each_entry(pos, &thermal_cdev_list, node) { | |
543a9561 LB |
811 | result = ops->bind(tz, pos); |
812 | if (result) | |
813 | break; | |
203d3d4a ZR |
814 | } |
815 | mutex_unlock(&thermal_list_lock); | |
816 | ||
817 | if (!result) | |
818 | return tz; | |
819 | ||
820 | unregister: | |
821 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); | |
822 | device_unregister(&tz->device); | |
3e6fda5c | 823 | return ERR_PTR(result); |
203d3d4a | 824 | } |
543a9561 | 825 | |
203d3d4a ZR |
826 | EXPORT_SYMBOL(thermal_zone_device_register); |
827 | ||
828 | /** | |
829 | * thermal_device_unregister - removes the registered thermal zone device | |
203d3d4a ZR |
830 | * @tz: the thermal zone device to remove |
831 | */ | |
832 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) | |
833 | { | |
834 | struct thermal_cooling_device *cdev; | |
835 | struct thermal_zone_device *pos = NULL; | |
836 | int count; | |
837 | ||
838 | if (!tz) | |
839 | return; | |
840 | ||
841 | mutex_lock(&thermal_list_lock); | |
842 | list_for_each_entry(pos, &thermal_tz_list, node) | |
843 | if (pos == tz) | |
844 | break; | |
845 | if (pos != tz) { | |
846 | /* thermal zone device not found */ | |
847 | mutex_unlock(&thermal_list_lock); | |
848 | return; | |
849 | } | |
850 | list_del(&tz->node); | |
851 | if (tz->ops->unbind) | |
852 | list_for_each_entry(cdev, &thermal_cdev_list, node) | |
853 | tz->ops->unbind(tz, cdev); | |
854 | mutex_unlock(&thermal_list_lock); | |
855 | ||
856 | if (tz->type[0]) | |
857 | device_remove_file(&tz->device, &dev_attr_type); | |
858 | device_remove_file(&tz->device, &dev_attr_temp); | |
859 | if (tz->ops->get_mode) | |
860 | device_remove_file(&tz->device, &dev_attr_mode); | |
861 | ||
862 | for (count = 0; count < tz->trips; count++) | |
863 | TRIP_POINT_ATTR_REMOVE(&tz->device, count); | |
864 | ||
e68b16ab | 865 | thermal_remove_hwmon_sysfs(tz); |
203d3d4a ZR |
866 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); |
867 | idr_destroy(&tz->idr); | |
868 | mutex_destroy(&tz->lock); | |
869 | device_unregister(&tz->device); | |
870 | return; | |
871 | } | |
543a9561 | 872 | |
203d3d4a ZR |
873 | EXPORT_SYMBOL(thermal_zone_device_unregister); |
874 | ||
875 | static int __init thermal_init(void) | |
876 | { | |
877 | int result = 0; | |
878 | ||
879 | result = class_register(&thermal_class); | |
880 | if (result) { | |
881 | idr_destroy(&thermal_tz_idr); | |
882 | idr_destroy(&thermal_cdev_idr); | |
883 | mutex_destroy(&thermal_idr_lock); | |
884 | mutex_destroy(&thermal_list_lock); | |
885 | } | |
886 | return result; | |
887 | } | |
888 | ||
889 | static void __exit thermal_exit(void) | |
890 | { | |
891 | class_unregister(&thermal_class); | |
892 | idr_destroy(&thermal_tz_idr); | |
893 | idr_destroy(&thermal_cdev_idr); | |
894 | mutex_destroy(&thermal_idr_lock); | |
895 | mutex_destroy(&thermal_list_lock); | |
896 | } | |
897 | ||
898 | subsys_initcall(thermal_init); | |
899 | module_exit(thermal_exit); |