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02361418 ADK |
1 | /* |
2 | * linux/drivers/thermal/cpu_cooling.c | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com) | |
5 | * Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * with this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
20 | * | |
21 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
22 | */ | |
02361418 ADK |
23 | #include <linux/module.h> |
24 | #include <linux/thermal.h> | |
02361418 ADK |
25 | #include <linux/cpufreq.h> |
26 | #include <linux/err.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/cpu.h> | |
29 | #include <linux/cpu_cooling.h> | |
30 | ||
31 | /** | |
3b3c0748 | 32 | * struct cpufreq_cooling_device - data for cooling device with cpufreq |
02361418 ADK |
33 | * @id: unique integer value corresponding to each cpufreq_cooling_device |
34 | * registered. | |
3b3c0748 EV |
35 | * @cool_dev: thermal_cooling_device pointer to keep track of the |
36 | * registered cooling device. | |
02361418 ADK |
37 | * @cpufreq_state: integer value representing the current state of cpufreq |
38 | * cooling devices. | |
39 | * @cpufreq_val: integer value representing the absolute value of the clipped | |
40 | * frequency. | |
41 | * @allowed_cpus: all the cpus involved for this cpufreq_cooling_device. | |
42 | * @node: list_head to link all cpufreq_cooling_device together. | |
43 | * | |
44 | * This structure is required for keeping information of each | |
45 | * cpufreq_cooling_device registered as a list whose head is represented by | |
46 | * cooling_cpufreq_list. In order to prevent corruption of this list a | |
47 | * mutex lock cooling_cpufreq_lock is used. | |
48 | */ | |
49 | struct cpufreq_cooling_device { | |
50 | int id; | |
51 | struct thermal_cooling_device *cool_dev; | |
52 | unsigned int cpufreq_state; | |
53 | unsigned int cpufreq_val; | |
54 | struct cpumask allowed_cpus; | |
55 | struct list_head node; | |
56 | }; | |
57 | static LIST_HEAD(cooling_cpufreq_list); | |
58 | static DEFINE_IDR(cpufreq_idr); | |
160b7d80 | 59 | static DEFINE_MUTEX(cooling_cpufreq_lock); |
02361418 | 60 | |
160b7d80 | 61 | static unsigned int cpufreq_dev_count; |
02361418 ADK |
62 | |
63 | /* notify_table passes value to the CPUFREQ_ADJUST callback function. */ | |
64 | #define NOTIFY_INVALID NULL | |
a0f846c2 | 65 | static struct cpufreq_cooling_device *notify_device; |
02361418 ADK |
66 | |
67 | /** | |
68 | * get_idr - function to get a unique id. | |
69 | * @idr: struct idr * handle used to create a id. | |
70 | * @id: int * value generated by this function. | |
71 | */ | |
72 | static int get_idr(struct idr *idr, int *id) | |
73 | { | |
6deb69fa | 74 | int ret; |
02361418 ADK |
75 | |
76 | mutex_lock(&cooling_cpufreq_lock); | |
6deb69fa | 77 | ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); |
02361418 | 78 | mutex_unlock(&cooling_cpufreq_lock); |
6deb69fa TH |
79 | if (unlikely(ret < 0)) |
80 | return ret; | |
81 | *id = ret; | |
02361418 ADK |
82 | return 0; |
83 | } | |
84 | ||
85 | /** | |
86 | * release_idr - function to free the unique id. | |
87 | * @idr: struct idr * handle used for creating the id. | |
88 | * @id: int value representing the unique id. | |
89 | */ | |
90 | static void release_idr(struct idr *idr, int id) | |
91 | { | |
92 | mutex_lock(&cooling_cpufreq_lock); | |
93 | idr_remove(idr, id); | |
94 | mutex_unlock(&cooling_cpufreq_lock); | |
95 | } | |
96 | ||
97 | /* Below code defines functions to be used for cpufreq as cooling device */ | |
98 | ||
99 | /** | |
82b9ee40 | 100 | * is_cpufreq_valid - function to check frequency transitioning capability. |
02361418 | 101 | * @cpu: cpu for which check is needed. |
82b9ee40 EV |
102 | * |
103 | * This function will check the current state of the system if | |
104 | * it is capable of changing the frequency for a given @cpu. | |
105 | * | |
106 | * Return: 0 if the system is not currently capable of changing | |
107 | * the frequency of given cpu. !0 in case the frequency is changeable. | |
02361418 ADK |
108 | */ |
109 | static int is_cpufreq_valid(int cpu) | |
110 | { | |
111 | struct cpufreq_policy policy; | |
112 | return !cpufreq_get_policy(&policy, cpu); | |
113 | } | |
114 | ||
fc35b35c ZR |
115 | enum cpufreq_cooling_property { |
116 | GET_LEVEL, | |
117 | GET_FREQ, | |
118 | GET_MAXL, | |
119 | }; | |
120 | ||
2d6f28fe EV |
121 | /** |
122 | * get_property - fetch a property of interest for a give cpu. | |
123 | * @cpu: cpu for which the property is required | |
124 | * @input: query parameter | |
125 | * @output: query return | |
126 | * @property: type of query (frequency, level, max level) | |
127 | * | |
128 | * This is the common function to | |
fc35b35c ZR |
129 | * 1. get maximum cpu cooling states |
130 | * 2. translate frequency to cooling state | |
131 | * 3. translate cooling state to frequency | |
132 | * Note that the code may be not in good shape | |
133 | * but it is written in this way in order to: | |
134 | * a) reduce duplicate code as most of the code can be shared. | |
135 | * b) make sure the logic is consistent when translating between | |
136 | * cooling states and frequencies. | |
2d6f28fe EV |
137 | * |
138 | * Return: 0 on success, -EINVAL when invalid parameters are passed. | |
139 | */ | |
fc35b35c ZR |
140 | static int get_property(unsigned int cpu, unsigned long input, |
141 | unsigned int* output, enum cpufreq_cooling_property property) | |
02361418 | 142 | { |
fc35b35c | 143 | int i, j; |
4469b997 | 144 | unsigned long max_level = 0, level = 0; |
fc35b35c ZR |
145 | unsigned int freq = CPUFREQ_ENTRY_INVALID; |
146 | int descend = -1; | |
02361418 ADK |
147 | struct cpufreq_frequency_table *table = |
148 | cpufreq_frequency_get_table(cpu); | |
fc35b35c ZR |
149 | |
150 | if (!output) | |
151 | return -EINVAL; | |
152 | ||
02361418 | 153 | if (!table) |
fc35b35c | 154 | return -EINVAL; |
02361418 | 155 | |
fc35b35c ZR |
156 | |
157 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
158 | /* ignore invalid entries */ | |
02361418 ADK |
159 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
160 | continue; | |
161 | ||
fc35b35c ZR |
162 | /* ignore duplicate entry */ |
163 | if (freq == table[i].frequency) | |
164 | continue; | |
165 | ||
166 | /* get the frequency order */ | |
167 | if (freq != CPUFREQ_ENTRY_INVALID && descend != -1) | |
168 | descend = !!(freq > table[i].frequency); | |
02361418 | 169 | |
fc35b35c ZR |
170 | freq = table[i].frequency; |
171 | max_level++; | |
02361418 | 172 | } |
02361418 | 173 | |
fc35b35c ZR |
174 | /* get max level */ |
175 | if (property == GET_MAXL) { | |
176 | *output = (unsigned int)max_level; | |
177 | return 0; | |
178 | } | |
02361418 | 179 | |
fc35b35c ZR |
180 | if (property == GET_FREQ) |
181 | level = descend ? input : (max_level - input -1); | |
182 | ||
02361418 | 183 | |
fc35b35c ZR |
184 | for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
185 | /* ignore invalid entry */ | |
02361418 ADK |
186 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
187 | continue; | |
fc35b35c ZR |
188 | |
189 | /* ignore duplicate entry */ | |
190 | if (freq == table[i].frequency) | |
191 | continue; | |
192 | ||
193 | /* now we have a valid frequency entry */ | |
194 | freq = table[i].frequency; | |
195 | ||
196 | if (property == GET_LEVEL && (unsigned int)input == freq) { | |
197 | /* get level by frequency */ | |
198 | *output = descend ? j : (max_level - j - 1); | |
199 | return 0; | |
200 | } | |
201 | if (property == GET_FREQ && level == j) { | |
202 | /* get frequency by level */ | |
203 | *output = freq; | |
204 | return 0; | |
205 | } | |
206 | j++; | |
02361418 | 207 | } |
fc35b35c ZR |
208 | return -EINVAL; |
209 | } | |
210 | ||
44952d33 EV |
211 | /** |
212 | * cpufreq_cooling_get_level - for a give cpu, return the cooling level. | |
213 | * @cpu: cpu for which the level is required | |
214 | * @freq: the frequency of interest | |
215 | * | |
216 | * This function will match the cooling level corresponding to the | |
217 | * requested @freq and return it. | |
218 | * | |
219 | * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID | |
220 | * otherwise. | |
221 | */ | |
57df8106 ZR |
222 | unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq) |
223 | { | |
224 | unsigned int val; | |
225 | ||
226 | if (get_property(cpu, (unsigned long)freq, &val, GET_LEVEL)) | |
227 | return THERMAL_CSTATE_INVALID; | |
228 | return (unsigned long)val; | |
229 | } | |
243dbd9c | 230 | EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level); |
57df8106 | 231 | |
fc35b35c ZR |
232 | /** |
233 | * get_cpu_frequency - get the absolute value of frequency from level. | |
234 | * @cpu: cpu for which frequency is fetched. | |
41518c41 EV |
235 | * @level: cooling level |
236 | * | |
237 | * This function matches cooling level with frequency. Based on a cooling level | |
238 | * of frequency, equals cooling state of cpu cooling device, it will return | |
239 | * the corresponding frequency. | |
fc35b35c | 240 | * e.g level=0 --> 1st MAX FREQ, level=1 ---> 2nd MAX FREQ, .... etc |
41518c41 EV |
241 | * |
242 | * Return: 0 on error, the corresponding frequency otherwise. | |
fc35b35c ZR |
243 | */ |
244 | static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level) | |
245 | { | |
246 | int ret = 0; | |
247 | unsigned int freq; | |
248 | ||
249 | ret = get_property(cpu, level, &freq, GET_FREQ); | |
250 | if (ret) | |
251 | return 0; | |
252 | return freq; | |
02361418 ADK |
253 | } |
254 | ||
255 | /** | |
256 | * cpufreq_apply_cooling - function to apply frequency clipping. | |
257 | * @cpufreq_device: cpufreq_cooling_device pointer containing frequency | |
258 | * clipping data. | |
259 | * @cooling_state: value of the cooling state. | |
4b33deb5 EV |
260 | * |
261 | * Function used to make sure the cpufreq layer is aware of current thermal | |
262 | * limits. The limits are applied by updating the cpufreq policy. | |
263 | * | |
264 | * Return: 0 on success, an error code otherwise (-EINVAL in case wrong | |
265 | * cooling state). | |
02361418 ADK |
266 | */ |
267 | static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device, | |
268 | unsigned long cooling_state) | |
269 | { | |
270 | unsigned int cpuid, clip_freq; | |
bde00663 LNM |
271 | struct cpumask *mask = &cpufreq_device->allowed_cpus; |
272 | unsigned int cpu = cpumask_any(mask); | |
02361418 ADK |
273 | |
274 | ||
275 | /* Check if the old cooling action is same as new cooling action */ | |
276 | if (cpufreq_device->cpufreq_state == cooling_state) | |
277 | return 0; | |
278 | ||
279 | clip_freq = get_cpu_frequency(cpu, cooling_state); | |
280 | if (!clip_freq) | |
281 | return -EINVAL; | |
282 | ||
283 | cpufreq_device->cpufreq_state = cooling_state; | |
284 | cpufreq_device->cpufreq_val = clip_freq; | |
285 | notify_device = cpufreq_device; | |
286 | ||
bde00663 | 287 | for_each_cpu(cpuid, mask) { |
02361418 ADK |
288 | if (is_cpufreq_valid(cpuid)) |
289 | cpufreq_update_policy(cpuid); | |
290 | } | |
291 | ||
292 | notify_device = NOTIFY_INVALID; | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | /** | |
298 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
299 | * @nb: struct notifier_block * with callback info. | |
300 | * @event: value showing cpufreq event for which this function invoked. | |
301 | * @data: callback-specific data | |
bab30554 EV |
302 | * |
303 | * Callback to highjack the notification on cpufreq policy transition. | |
304 | * Every time there is a change in policy, we will intercept and | |
305 | * update the cpufreq policy with thermal constraints. | |
306 | * | |
307 | * Return: 0 (success) | |
02361418 ADK |
308 | */ |
309 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
310 | unsigned long event, void *data) | |
311 | { | |
312 | struct cpufreq_policy *policy = data; | |
313 | unsigned long max_freq = 0; | |
314 | ||
315 | if (event != CPUFREQ_ADJUST || notify_device == NOTIFY_INVALID) | |
316 | return 0; | |
317 | ||
318 | if (cpumask_test_cpu(policy->cpu, ¬ify_device->allowed_cpus)) | |
319 | max_freq = notify_device->cpufreq_val; | |
320 | ||
321 | /* Never exceed user_policy.max*/ | |
322 | if (max_freq > policy->user_policy.max) | |
323 | max_freq = policy->user_policy.max; | |
324 | ||
325 | if (policy->max != max_freq) | |
326 | cpufreq_verify_within_limits(policy, 0, max_freq); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | /* | |
332 | * cpufreq cooling device callback functions are defined below | |
333 | */ | |
334 | ||
335 | /** | |
336 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
337 | * @cdev: thermal cooling device pointer. | |
338 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
339 | * |
340 | * Callback for the thermal cooling device to return the cpufreq | |
341 | * max cooling state. | |
342 | * | |
343 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
344 | */ |
345 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
346 | unsigned long *state) | |
347 | { | |
160b7d80 | 348 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
bde00663 | 349 | struct cpumask *mask = &cpufreq_device->allowed_cpus; |
02361418 | 350 | unsigned int cpu; |
4f89038f | 351 | unsigned int count = 0; |
fc35b35c | 352 | int ret; |
02361418 | 353 | |
bde00663 | 354 | cpu = cpumask_any(mask); |
02361418 | 355 | |
4f89038f | 356 | ret = get_property(cpu, 0, &count, GET_MAXL); |
9c51b05a | 357 | |
fc35b35c ZR |
358 | if (count > 0) |
359 | *state = count; | |
02361418 | 360 | |
fc35b35c | 361 | return ret; |
02361418 ADK |
362 | } |
363 | ||
364 | /** | |
365 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
366 | * @cdev: thermal cooling device pointer. | |
367 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
368 | * |
369 | * Callback for the thermal cooling device to return the cpufreq | |
370 | * current cooling state. | |
371 | * | |
372 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
373 | */ |
374 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
375 | unsigned long *state) | |
376 | { | |
160b7d80 | 377 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 378 | |
160b7d80 | 379 | *state = cpufreq_device->cpufreq_state; |
380 | return 0; | |
02361418 ADK |
381 | } |
382 | ||
383 | /** | |
384 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
385 | * @cdev: thermal cooling device pointer. | |
386 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
387 | * |
388 | * Callback for the thermal cooling device to change the cpufreq | |
389 | * current cooling state. | |
390 | * | |
391 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
392 | */ |
393 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
394 | unsigned long state) | |
395 | { | |
160b7d80 | 396 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 397 | |
160b7d80 | 398 | return cpufreq_apply_cooling(cpufreq_device, state); |
02361418 ADK |
399 | } |
400 | ||
401 | /* Bind cpufreq callbacks to thermal cooling device ops */ | |
402 | static struct thermal_cooling_device_ops const cpufreq_cooling_ops = { | |
403 | .get_max_state = cpufreq_get_max_state, | |
404 | .get_cur_state = cpufreq_get_cur_state, | |
405 | .set_cur_state = cpufreq_set_cur_state, | |
406 | }; | |
407 | ||
408 | /* Notifier for cpufreq policy change */ | |
409 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
410 | .notifier_call = cpufreq_thermal_notifier, | |
411 | }; | |
412 | ||
413 | /** | |
414 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
415 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
12cb08ba EV |
416 | * |
417 | * This interface function registers the cpufreq cooling device with the name | |
418 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
419 | * cooling devices. | |
420 | * | |
421 | * Return: a valid struct thermal_cooling_device pointer on success, | |
422 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 ADK |
423 | */ |
424 | struct thermal_cooling_device *cpufreq_cooling_register( | |
3778ff5c | 425 | const struct cpumask *clip_cpus) |
02361418 ADK |
426 | { |
427 | struct thermal_cooling_device *cool_dev; | |
428 | struct cpufreq_cooling_device *cpufreq_dev = NULL; | |
160b7d80 | 429 | unsigned int min = 0, max = 0; |
02361418 | 430 | char dev_name[THERMAL_NAME_LENGTH]; |
a4b6fec9 | 431 | int ret = 0, i; |
02361418 ADK |
432 | struct cpufreq_policy policy; |
433 | ||
02361418 ADK |
434 | /*Verify that all the clip cpus have same freq_min, freq_max limit*/ |
435 | for_each_cpu(i, clip_cpus) { | |
436 | /*continue if cpufreq policy not found and not return error*/ | |
437 | if (!cpufreq_get_policy(&policy, i)) | |
438 | continue; | |
439 | if (min == 0 && max == 0) { | |
440 | min = policy.cpuinfo.min_freq; | |
441 | max = policy.cpuinfo.max_freq; | |
442 | } else { | |
443 | if (min != policy.cpuinfo.min_freq || | |
444 | max != policy.cpuinfo.max_freq) | |
445 | return ERR_PTR(-EINVAL); | |
6b6519df | 446 | } |
02361418 ADK |
447 | } |
448 | cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device), | |
449 | GFP_KERNEL); | |
450 | if (!cpufreq_dev) | |
451 | return ERR_PTR(-ENOMEM); | |
452 | ||
453 | cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus); | |
454 | ||
02361418 ADK |
455 | ret = get_idr(&cpufreq_idr, &cpufreq_dev->id); |
456 | if (ret) { | |
457 | kfree(cpufreq_dev); | |
458 | return ERR_PTR(-EINVAL); | |
459 | } | |
460 | ||
99871a71 EV |
461 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
462 | cpufreq_dev->id); | |
02361418 ADK |
463 | |
464 | cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev, | |
465 | &cpufreq_cooling_ops); | |
466 | if (!cool_dev) { | |
467 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
468 | kfree(cpufreq_dev); | |
469 | return ERR_PTR(-EINVAL); | |
470 | } | |
02361418 ADK |
471 | cpufreq_dev->cool_dev = cool_dev; |
472 | cpufreq_dev->cpufreq_state = 0; | |
473 | mutex_lock(&cooling_cpufreq_lock); | |
02361418 ADK |
474 | |
475 | /* Register the notifier for first cpufreq cooling device */ | |
476 | if (cpufreq_dev_count == 0) | |
477 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, | |
478 | CPUFREQ_POLICY_NOTIFIER); | |
160b7d80 | 479 | cpufreq_dev_count++; |
02361418 ADK |
480 | |
481 | mutex_unlock(&cooling_cpufreq_lock); | |
482 | return cool_dev; | |
483 | } | |
243dbd9c | 484 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 ADK |
485 | |
486 | /** | |
487 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
488 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
489 | * |
490 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
491 | */ |
492 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
493 | { | |
160b7d80 | 494 | struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata; |
02361418 ADK |
495 | |
496 | mutex_lock(&cooling_cpufreq_lock); | |
160b7d80 | 497 | cpufreq_dev_count--; |
02361418 ADK |
498 | |
499 | /* Unregister the notifier for the last cpufreq cooling device */ | |
2d9bf71c | 500 | if (cpufreq_dev_count == 0) |
02361418 ADK |
501 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
502 | CPUFREQ_POLICY_NOTIFIER); | |
2d9bf71c | 503 | |
02361418 | 504 | mutex_unlock(&cooling_cpufreq_lock); |
160b7d80 | 505 | |
02361418 ADK |
506 | thermal_cooling_device_unregister(cpufreq_dev->cool_dev); |
507 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
02361418 ADK |
508 | kfree(cpufreq_dev); |
509 | } | |
243dbd9c | 510 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |