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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. | |
02361418 ADK |
42 | * |
43 | * This structure is required for keeping information of each | |
67d0b2a8 | 44 | * cpufreq_cooling_device registered. In order to prevent corruption of this a |
02361418 ADK |
45 | * mutex lock cooling_cpufreq_lock is used. |
46 | */ | |
47 | struct cpufreq_cooling_device { | |
48 | int id; | |
49 | struct thermal_cooling_device *cool_dev; | |
50 | unsigned int cpufreq_state; | |
51 | unsigned int cpufreq_val; | |
52 | struct cpumask allowed_cpus; | |
02361418 | 53 | }; |
02361418 | 54 | static DEFINE_IDR(cpufreq_idr); |
160b7d80 | 55 | static DEFINE_MUTEX(cooling_cpufreq_lock); |
02361418 | 56 | |
160b7d80 | 57 | static unsigned int cpufreq_dev_count; |
02361418 ADK |
58 | |
59 | /* notify_table passes value to the CPUFREQ_ADJUST callback function. */ | |
60 | #define NOTIFY_INVALID NULL | |
a0f846c2 | 61 | static struct cpufreq_cooling_device *notify_device; |
02361418 ADK |
62 | |
63 | /** | |
64 | * get_idr - function to get a unique id. | |
65 | * @idr: struct idr * handle used to create a id. | |
66 | * @id: int * value generated by this function. | |
67 | */ | |
68 | static int get_idr(struct idr *idr, int *id) | |
69 | { | |
6deb69fa | 70 | int ret; |
02361418 ADK |
71 | |
72 | mutex_lock(&cooling_cpufreq_lock); | |
6deb69fa | 73 | ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); |
02361418 | 74 | mutex_unlock(&cooling_cpufreq_lock); |
6deb69fa TH |
75 | if (unlikely(ret < 0)) |
76 | return ret; | |
77 | *id = ret; | |
02361418 ADK |
78 | return 0; |
79 | } | |
80 | ||
81 | /** | |
82 | * release_idr - function to free the unique id. | |
83 | * @idr: struct idr * handle used for creating the id. | |
84 | * @id: int value representing the unique id. | |
85 | */ | |
86 | static void release_idr(struct idr *idr, int id) | |
87 | { | |
88 | mutex_lock(&cooling_cpufreq_lock); | |
89 | idr_remove(idr, id); | |
90 | mutex_unlock(&cooling_cpufreq_lock); | |
91 | } | |
92 | ||
93 | /* Below code defines functions to be used for cpufreq as cooling device */ | |
94 | ||
95 | /** | |
82b9ee40 | 96 | * is_cpufreq_valid - function to check frequency transitioning capability. |
02361418 | 97 | * @cpu: cpu for which check is needed. |
82b9ee40 EV |
98 | * |
99 | * This function will check the current state of the system if | |
100 | * it is capable of changing the frequency for a given @cpu. | |
101 | * | |
102 | * Return: 0 if the system is not currently capable of changing | |
103 | * the frequency of given cpu. !0 in case the frequency is changeable. | |
02361418 ADK |
104 | */ |
105 | static int is_cpufreq_valid(int cpu) | |
106 | { | |
107 | struct cpufreq_policy policy; | |
108 | return !cpufreq_get_policy(&policy, cpu); | |
109 | } | |
110 | ||
fc35b35c ZR |
111 | enum cpufreq_cooling_property { |
112 | GET_LEVEL, | |
113 | GET_FREQ, | |
114 | GET_MAXL, | |
115 | }; | |
116 | ||
2d6f28fe EV |
117 | /** |
118 | * get_property - fetch a property of interest for a give cpu. | |
119 | * @cpu: cpu for which the property is required | |
120 | * @input: query parameter | |
121 | * @output: query return | |
122 | * @property: type of query (frequency, level, max level) | |
123 | * | |
124 | * This is the common function to | |
fc35b35c ZR |
125 | * 1. get maximum cpu cooling states |
126 | * 2. translate frequency to cooling state | |
127 | * 3. translate cooling state to frequency | |
128 | * Note that the code may be not in good shape | |
129 | * but it is written in this way in order to: | |
130 | * a) reduce duplicate code as most of the code can be shared. | |
131 | * b) make sure the logic is consistent when translating between | |
132 | * cooling states and frequencies. | |
2d6f28fe EV |
133 | * |
134 | * Return: 0 on success, -EINVAL when invalid parameters are passed. | |
135 | */ | |
fc35b35c ZR |
136 | static int get_property(unsigned int cpu, unsigned long input, |
137 | unsigned int* output, enum cpufreq_cooling_property property) | |
02361418 | 138 | { |
fc35b35c | 139 | int i, j; |
4469b997 | 140 | unsigned long max_level = 0, level = 0; |
fc35b35c ZR |
141 | unsigned int freq = CPUFREQ_ENTRY_INVALID; |
142 | int descend = -1; | |
02361418 ADK |
143 | struct cpufreq_frequency_table *table = |
144 | cpufreq_frequency_get_table(cpu); | |
fc35b35c ZR |
145 | |
146 | if (!output) | |
147 | return -EINVAL; | |
148 | ||
02361418 | 149 | if (!table) |
fc35b35c | 150 | return -EINVAL; |
02361418 | 151 | |
fc35b35c ZR |
152 | |
153 | for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { | |
154 | /* ignore invalid entries */ | |
02361418 ADK |
155 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
156 | continue; | |
157 | ||
fc35b35c ZR |
158 | /* ignore duplicate entry */ |
159 | if (freq == table[i].frequency) | |
160 | continue; | |
161 | ||
162 | /* get the frequency order */ | |
163 | if (freq != CPUFREQ_ENTRY_INVALID && descend != -1) | |
164 | descend = !!(freq > table[i].frequency); | |
02361418 | 165 | |
fc35b35c ZR |
166 | freq = table[i].frequency; |
167 | max_level++; | |
02361418 | 168 | } |
02361418 | 169 | |
fc35b35c ZR |
170 | /* get max level */ |
171 | if (property == GET_MAXL) { | |
172 | *output = (unsigned int)max_level; | |
173 | return 0; | |
174 | } | |
02361418 | 175 | |
fc35b35c ZR |
176 | if (property == GET_FREQ) |
177 | level = descend ? input : (max_level - input -1); | |
178 | ||
02361418 | 179 | |
fc35b35c ZR |
180 | for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { |
181 | /* ignore invalid entry */ | |
02361418 ADK |
182 | if (table[i].frequency == CPUFREQ_ENTRY_INVALID) |
183 | continue; | |
fc35b35c ZR |
184 | |
185 | /* ignore duplicate entry */ | |
186 | if (freq == table[i].frequency) | |
187 | continue; | |
188 | ||
189 | /* now we have a valid frequency entry */ | |
190 | freq = table[i].frequency; | |
191 | ||
192 | if (property == GET_LEVEL && (unsigned int)input == freq) { | |
193 | /* get level by frequency */ | |
194 | *output = descend ? j : (max_level - j - 1); | |
195 | return 0; | |
196 | } | |
197 | if (property == GET_FREQ && level == j) { | |
198 | /* get frequency by level */ | |
199 | *output = freq; | |
200 | return 0; | |
201 | } | |
202 | j++; | |
02361418 | 203 | } |
fc35b35c ZR |
204 | return -EINVAL; |
205 | } | |
206 | ||
44952d33 EV |
207 | /** |
208 | * cpufreq_cooling_get_level - for a give cpu, return the cooling level. | |
209 | * @cpu: cpu for which the level is required | |
210 | * @freq: the frequency of interest | |
211 | * | |
212 | * This function will match the cooling level corresponding to the | |
213 | * requested @freq and return it. | |
214 | * | |
215 | * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID | |
216 | * otherwise. | |
217 | */ | |
57df8106 ZR |
218 | unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq) |
219 | { | |
220 | unsigned int val; | |
221 | ||
222 | if (get_property(cpu, (unsigned long)freq, &val, GET_LEVEL)) | |
223 | return THERMAL_CSTATE_INVALID; | |
224 | return (unsigned long)val; | |
225 | } | |
243dbd9c | 226 | EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level); |
57df8106 | 227 | |
fc35b35c ZR |
228 | /** |
229 | * get_cpu_frequency - get the absolute value of frequency from level. | |
230 | * @cpu: cpu for which frequency is fetched. | |
41518c41 EV |
231 | * @level: cooling level |
232 | * | |
233 | * This function matches cooling level with frequency. Based on a cooling level | |
234 | * of frequency, equals cooling state of cpu cooling device, it will return | |
235 | * the corresponding frequency. | |
fc35b35c | 236 | * e.g level=0 --> 1st MAX FREQ, level=1 ---> 2nd MAX FREQ, .... etc |
41518c41 EV |
237 | * |
238 | * Return: 0 on error, the corresponding frequency otherwise. | |
fc35b35c ZR |
239 | */ |
240 | static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level) | |
241 | { | |
242 | int ret = 0; | |
243 | unsigned int freq; | |
244 | ||
245 | ret = get_property(cpu, level, &freq, GET_FREQ); | |
246 | if (ret) | |
247 | return 0; | |
248 | return freq; | |
02361418 ADK |
249 | } |
250 | ||
251 | /** | |
252 | * cpufreq_apply_cooling - function to apply frequency clipping. | |
253 | * @cpufreq_device: cpufreq_cooling_device pointer containing frequency | |
254 | * clipping data. | |
255 | * @cooling_state: value of the cooling state. | |
4b33deb5 EV |
256 | * |
257 | * Function used to make sure the cpufreq layer is aware of current thermal | |
258 | * limits. The limits are applied by updating the cpufreq policy. | |
259 | * | |
260 | * Return: 0 on success, an error code otherwise (-EINVAL in case wrong | |
261 | * cooling state). | |
02361418 ADK |
262 | */ |
263 | static int cpufreq_apply_cooling(struct cpufreq_cooling_device *cpufreq_device, | |
264 | unsigned long cooling_state) | |
265 | { | |
266 | unsigned int cpuid, clip_freq; | |
bde00663 LNM |
267 | struct cpumask *mask = &cpufreq_device->allowed_cpus; |
268 | unsigned int cpu = cpumask_any(mask); | |
02361418 ADK |
269 | |
270 | ||
271 | /* Check if the old cooling action is same as new cooling action */ | |
272 | if (cpufreq_device->cpufreq_state == cooling_state) | |
273 | return 0; | |
274 | ||
275 | clip_freq = get_cpu_frequency(cpu, cooling_state); | |
276 | if (!clip_freq) | |
277 | return -EINVAL; | |
278 | ||
279 | cpufreq_device->cpufreq_state = cooling_state; | |
280 | cpufreq_device->cpufreq_val = clip_freq; | |
281 | notify_device = cpufreq_device; | |
282 | ||
bde00663 | 283 | for_each_cpu(cpuid, mask) { |
02361418 ADK |
284 | if (is_cpufreq_valid(cpuid)) |
285 | cpufreq_update_policy(cpuid); | |
286 | } | |
287 | ||
288 | notify_device = NOTIFY_INVALID; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | /** | |
294 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
295 | * @nb: struct notifier_block * with callback info. | |
296 | * @event: value showing cpufreq event for which this function invoked. | |
297 | * @data: callback-specific data | |
bab30554 EV |
298 | * |
299 | * Callback to highjack the notification on cpufreq policy transition. | |
300 | * Every time there is a change in policy, we will intercept and | |
301 | * update the cpufreq policy with thermal constraints. | |
302 | * | |
303 | * Return: 0 (success) | |
02361418 ADK |
304 | */ |
305 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
306 | unsigned long event, void *data) | |
307 | { | |
308 | struct cpufreq_policy *policy = data; | |
309 | unsigned long max_freq = 0; | |
310 | ||
311 | if (event != CPUFREQ_ADJUST || notify_device == NOTIFY_INVALID) | |
312 | return 0; | |
313 | ||
314 | if (cpumask_test_cpu(policy->cpu, ¬ify_device->allowed_cpus)) | |
315 | max_freq = notify_device->cpufreq_val; | |
316 | ||
317 | /* Never exceed user_policy.max*/ | |
318 | if (max_freq > policy->user_policy.max) | |
319 | max_freq = policy->user_policy.max; | |
320 | ||
321 | if (policy->max != max_freq) | |
322 | cpufreq_verify_within_limits(policy, 0, max_freq); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * cpufreq cooling device callback functions are defined below | |
329 | */ | |
330 | ||
331 | /** | |
332 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
333 | * @cdev: thermal cooling device pointer. | |
334 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
335 | * |
336 | * Callback for the thermal cooling device to return the cpufreq | |
337 | * max cooling state. | |
338 | * | |
339 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
340 | */ |
341 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
342 | unsigned long *state) | |
343 | { | |
160b7d80 | 344 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
bde00663 | 345 | struct cpumask *mask = &cpufreq_device->allowed_cpus; |
02361418 | 346 | unsigned int cpu; |
4f89038f | 347 | unsigned int count = 0; |
fc35b35c | 348 | int ret; |
02361418 | 349 | |
bde00663 | 350 | cpu = cpumask_any(mask); |
02361418 | 351 | |
4f89038f | 352 | ret = get_property(cpu, 0, &count, GET_MAXL); |
9c51b05a | 353 | |
fc35b35c ZR |
354 | if (count > 0) |
355 | *state = count; | |
02361418 | 356 | |
fc35b35c | 357 | return ret; |
02361418 ADK |
358 | } |
359 | ||
360 | /** | |
361 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
362 | * @cdev: thermal cooling device pointer. | |
363 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
364 | * |
365 | * Callback for the thermal cooling device to return the cpufreq | |
366 | * current cooling state. | |
367 | * | |
368 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
369 | */ |
370 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
371 | unsigned long *state) | |
372 | { | |
160b7d80 | 373 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 374 | |
160b7d80 | 375 | *state = cpufreq_device->cpufreq_state; |
376 | return 0; | |
02361418 ADK |
377 | } |
378 | ||
379 | /** | |
380 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
381 | * @cdev: thermal cooling device pointer. | |
382 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
383 | * |
384 | * Callback for the thermal cooling device to change the cpufreq | |
385 | * current cooling state. | |
386 | * | |
387 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
388 | */ |
389 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
390 | unsigned long state) | |
391 | { | |
160b7d80 | 392 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 393 | |
160b7d80 | 394 | return cpufreq_apply_cooling(cpufreq_device, state); |
02361418 ADK |
395 | } |
396 | ||
397 | /* Bind cpufreq callbacks to thermal cooling device ops */ | |
398 | static struct thermal_cooling_device_ops const cpufreq_cooling_ops = { | |
399 | .get_max_state = cpufreq_get_max_state, | |
400 | .get_cur_state = cpufreq_get_cur_state, | |
401 | .set_cur_state = cpufreq_set_cur_state, | |
402 | }; | |
403 | ||
404 | /* Notifier for cpufreq policy change */ | |
405 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
406 | .notifier_call = cpufreq_thermal_notifier, | |
407 | }; | |
408 | ||
409 | /** | |
410 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
411 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
12cb08ba EV |
412 | * |
413 | * This interface function registers the cpufreq cooling device with the name | |
414 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
415 | * cooling devices. | |
416 | * | |
417 | * Return: a valid struct thermal_cooling_device pointer on success, | |
418 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 ADK |
419 | */ |
420 | struct thermal_cooling_device *cpufreq_cooling_register( | |
3778ff5c | 421 | const struct cpumask *clip_cpus) |
02361418 ADK |
422 | { |
423 | struct thermal_cooling_device *cool_dev; | |
424 | struct cpufreq_cooling_device *cpufreq_dev = NULL; | |
160b7d80 | 425 | unsigned int min = 0, max = 0; |
02361418 | 426 | char dev_name[THERMAL_NAME_LENGTH]; |
a4b6fec9 | 427 | int ret = 0, i; |
02361418 ADK |
428 | struct cpufreq_policy policy; |
429 | ||
02361418 ADK |
430 | /*Verify that all the clip cpus have same freq_min, freq_max limit*/ |
431 | for_each_cpu(i, clip_cpus) { | |
432 | /*continue if cpufreq policy not found and not return error*/ | |
433 | if (!cpufreq_get_policy(&policy, i)) | |
434 | continue; | |
435 | if (min == 0 && max == 0) { | |
436 | min = policy.cpuinfo.min_freq; | |
437 | max = policy.cpuinfo.max_freq; | |
438 | } else { | |
439 | if (min != policy.cpuinfo.min_freq || | |
440 | max != policy.cpuinfo.max_freq) | |
441 | return ERR_PTR(-EINVAL); | |
6b6519df | 442 | } |
02361418 ADK |
443 | } |
444 | cpufreq_dev = kzalloc(sizeof(struct cpufreq_cooling_device), | |
445 | GFP_KERNEL); | |
446 | if (!cpufreq_dev) | |
447 | return ERR_PTR(-ENOMEM); | |
448 | ||
449 | cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus); | |
450 | ||
02361418 ADK |
451 | ret = get_idr(&cpufreq_idr, &cpufreq_dev->id); |
452 | if (ret) { | |
453 | kfree(cpufreq_dev); | |
454 | return ERR_PTR(-EINVAL); | |
455 | } | |
456 | ||
99871a71 EV |
457 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
458 | cpufreq_dev->id); | |
02361418 ADK |
459 | |
460 | cool_dev = thermal_cooling_device_register(dev_name, cpufreq_dev, | |
461 | &cpufreq_cooling_ops); | |
462 | if (!cool_dev) { | |
463 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
464 | kfree(cpufreq_dev); | |
465 | return ERR_PTR(-EINVAL); | |
466 | } | |
02361418 ADK |
467 | cpufreq_dev->cool_dev = cool_dev; |
468 | cpufreq_dev->cpufreq_state = 0; | |
469 | mutex_lock(&cooling_cpufreq_lock); | |
02361418 ADK |
470 | |
471 | /* Register the notifier for first cpufreq cooling device */ | |
472 | if (cpufreq_dev_count == 0) | |
473 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, | |
474 | CPUFREQ_POLICY_NOTIFIER); | |
160b7d80 | 475 | cpufreq_dev_count++; |
02361418 ADK |
476 | |
477 | mutex_unlock(&cooling_cpufreq_lock); | |
478 | return cool_dev; | |
479 | } | |
243dbd9c | 480 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 ADK |
481 | |
482 | /** | |
483 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
484 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
485 | * |
486 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
487 | */ |
488 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
489 | { | |
160b7d80 | 490 | struct cpufreq_cooling_device *cpufreq_dev = cdev->devdata; |
02361418 ADK |
491 | |
492 | mutex_lock(&cooling_cpufreq_lock); | |
160b7d80 | 493 | cpufreq_dev_count--; |
02361418 ADK |
494 | |
495 | /* Unregister the notifier for the last cpufreq cooling device */ | |
2d9bf71c | 496 | if (cpufreq_dev_count == 0) |
02361418 ADK |
497 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
498 | CPUFREQ_POLICY_NOTIFIER); | |
2d9bf71c | 499 | |
02361418 | 500 | mutex_unlock(&cooling_cpufreq_lock); |
160b7d80 | 501 | |
02361418 ADK |
502 | thermal_cooling_device_unregister(cpufreq_dev->cool_dev); |
503 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
02361418 ADK |
504 | kfree(cpufreq_dev); |
505 | } | |
243dbd9c | 506 | EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister); |