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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 | ||
07d888d8 VK |
31 | /* |
32 | * Cooling state <-> CPUFreq frequency | |
33 | * | |
34 | * Cooling states are translated to frequencies throughout this driver and this | |
35 | * is the relation between them. | |
36 | * | |
37 | * Highest cooling state corresponds to lowest possible frequency. | |
38 | * | |
39 | * i.e. | |
40 | * level 0 --> 1st Max Freq | |
41 | * level 1 --> 2nd Max Freq | |
42 | * ... | |
43 | */ | |
44 | ||
02361418 | 45 | /** |
3b3c0748 | 46 | * struct cpufreq_cooling_device - data for cooling device with cpufreq |
02361418 ADK |
47 | * @id: unique integer value corresponding to each cpufreq_cooling_device |
48 | * registered. | |
3b3c0748 EV |
49 | * @cool_dev: thermal_cooling_device pointer to keep track of the |
50 | * registered cooling device. | |
02361418 ADK |
51 | * @cpufreq_state: integer value representing the current state of cpufreq |
52 | * cooling devices. | |
53 | * @cpufreq_val: integer value representing the absolute value of the clipped | |
54 | * frequency. | |
dcc6c7fd VK |
55 | * @max_level: maximum cooling level. One less than total number of valid |
56 | * cpufreq frequencies. | |
02361418 | 57 | * @allowed_cpus: all the cpus involved for this cpufreq_cooling_device. |
02361418 | 58 | * |
beca6053 VK |
59 | * This structure is required for keeping information of each registered |
60 | * cpufreq_cooling_device. | |
02361418 ADK |
61 | */ |
62 | struct cpufreq_cooling_device { | |
63 | int id; | |
64 | struct thermal_cooling_device *cool_dev; | |
65 | unsigned int cpufreq_state; | |
66 | unsigned int cpufreq_val; | |
dcc6c7fd | 67 | unsigned int max_level; |
02361418 | 68 | struct cpumask allowed_cpus; |
2dcd851f | 69 | struct list_head node; |
02361418 | 70 | }; |
02361418 | 71 | static DEFINE_IDR(cpufreq_idr); |
160b7d80 | 72 | static DEFINE_MUTEX(cooling_cpufreq_lock); |
02361418 | 73 | |
2dcd851f | 74 | static LIST_HEAD(cpufreq_dev_list); |
02361418 ADK |
75 | |
76 | /** | |
77 | * get_idr - function to get a unique id. | |
78 | * @idr: struct idr * handle used to create a id. | |
79 | * @id: int * value generated by this function. | |
79491e53 EV |
80 | * |
81 | * This function will populate @id with an unique | |
82 | * id, using the idr API. | |
83 | * | |
84 | * Return: 0 on success, an error code on failure. | |
02361418 ADK |
85 | */ |
86 | static int get_idr(struct idr *idr, int *id) | |
87 | { | |
6deb69fa | 88 | int ret; |
02361418 ADK |
89 | |
90 | mutex_lock(&cooling_cpufreq_lock); | |
6deb69fa | 91 | ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL); |
02361418 | 92 | mutex_unlock(&cooling_cpufreq_lock); |
6deb69fa TH |
93 | if (unlikely(ret < 0)) |
94 | return ret; | |
95 | *id = ret; | |
79491e53 | 96 | |
02361418 ADK |
97 | return 0; |
98 | } | |
99 | ||
100 | /** | |
101 | * release_idr - function to free the unique id. | |
102 | * @idr: struct idr * handle used for creating the id. | |
103 | * @id: int value representing the unique id. | |
104 | */ | |
105 | static void release_idr(struct idr *idr, int id) | |
106 | { | |
107 | mutex_lock(&cooling_cpufreq_lock); | |
108 | idr_remove(idr, id); | |
109 | mutex_unlock(&cooling_cpufreq_lock); | |
110 | } | |
111 | ||
112 | /* Below code defines functions to be used for cpufreq as cooling device */ | |
113 | ||
fc35b35c ZR |
114 | enum cpufreq_cooling_property { |
115 | GET_LEVEL, | |
116 | GET_FREQ, | |
fc35b35c ZR |
117 | }; |
118 | ||
2d6f28fe | 119 | /** |
728c03c9 | 120 | * get_property - fetch a property of interest for a given cpu. |
2d6f28fe EV |
121 | * @cpu: cpu for which the property is required |
122 | * @input: query parameter | |
123 | * @output: query return | |
97afa4aa | 124 | * @property: type of query (frequency, level) |
2d6f28fe EV |
125 | * |
126 | * This is the common function to | |
97afa4aa VK |
127 | * 1. translate frequency to cooling state |
128 | * 2. translate cooling state to frequency | |
728c03c9 | 129 | * |
fc35b35c ZR |
130 | * Note that the code may be not in good shape |
131 | * but it is written in this way in order to: | |
132 | * a) reduce duplicate code as most of the code can be shared. | |
133 | * b) make sure the logic is consistent when translating between | |
134 | * cooling states and frequencies. | |
2d6f28fe EV |
135 | * |
136 | * Return: 0 on success, -EINVAL when invalid parameters are passed. | |
137 | */ | |
fc35b35c | 138 | static int get_property(unsigned int cpu, unsigned long input, |
d8892a01 EV |
139 | unsigned int *output, |
140 | enum cpufreq_cooling_property property) | |
02361418 | 141 | { |
3c84ef3a | 142 | int i; |
4469b997 | 143 | unsigned long max_level = 0, level = 0; |
fc35b35c ZR |
144 | unsigned int freq = CPUFREQ_ENTRY_INVALID; |
145 | int descend = -1; | |
3c84ef3a | 146 | struct cpufreq_frequency_table *pos, *table = |
02361418 | 147 | cpufreq_frequency_get_table(cpu); |
79d26401 | 148 | |
fc35b35c ZR |
149 | if (!output) |
150 | return -EINVAL; | |
151 | ||
02361418 | 152 | if (!table) |
fc35b35c | 153 | return -EINVAL; |
02361418 | 154 | |
3c84ef3a | 155 | cpufreq_for_each_valid_entry(pos, table) { |
fc35b35c | 156 | /* ignore duplicate entry */ |
3c84ef3a | 157 | if (freq == pos->frequency) |
fc35b35c ZR |
158 | continue; |
159 | ||
160 | /* get the frequency order */ | |
24c7a381 | 161 | if (freq != CPUFREQ_ENTRY_INVALID && descend == -1) |
3c84ef3a | 162 | descend = freq > pos->frequency; |
02361418 | 163 | |
3c84ef3a | 164 | freq = pos->frequency; |
fc35b35c | 165 | max_level++; |
02361418 | 166 | } |
a116776f ZR |
167 | |
168 | /* No valid cpu frequency entry */ | |
169 | if (max_level == 0) | |
170 | return -EINVAL; | |
171 | ||
1c9573a4 EV |
172 | /* max_level is an index, not a counter */ |
173 | max_level--; | |
02361418 | 174 | |
fc35b35c | 175 | if (property == GET_FREQ) |
1c9573a4 | 176 | level = descend ? input : (max_level - input); |
fc35b35c | 177 | |
3c84ef3a SK |
178 | i = 0; |
179 | cpufreq_for_each_valid_entry(pos, table) { | |
fc35b35c | 180 | /* ignore duplicate entry */ |
3c84ef3a | 181 | if (freq == pos->frequency) |
fc35b35c ZR |
182 | continue; |
183 | ||
184 | /* now we have a valid frequency entry */ | |
3c84ef3a | 185 | freq = pos->frequency; |
fc35b35c ZR |
186 | |
187 | if (property == GET_LEVEL && (unsigned int)input == freq) { | |
188 | /* get level by frequency */ | |
3c84ef3a | 189 | *output = descend ? i : (max_level - i); |
fc35b35c ZR |
190 | return 0; |
191 | } | |
3c84ef3a | 192 | if (property == GET_FREQ && level == i) { |
fc35b35c ZR |
193 | /* get frequency by level */ |
194 | *output = freq; | |
195 | return 0; | |
196 | } | |
3c84ef3a | 197 | i++; |
02361418 | 198 | } |
79491e53 | 199 | |
fc35b35c ZR |
200 | return -EINVAL; |
201 | } | |
202 | ||
44952d33 | 203 | /** |
728c03c9 | 204 | * cpufreq_cooling_get_level - for a given cpu, return the cooling level. |
44952d33 EV |
205 | * @cpu: cpu for which the level is required |
206 | * @freq: the frequency of interest | |
207 | * | |
208 | * This function will match the cooling level corresponding to the | |
209 | * requested @freq and return it. | |
210 | * | |
211 | * Return: The matched cooling level on success or THERMAL_CSTATE_INVALID | |
212 | * otherwise. | |
213 | */ | |
57df8106 ZR |
214 | unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq) |
215 | { | |
216 | unsigned int val; | |
217 | ||
218 | if (get_property(cpu, (unsigned long)freq, &val, GET_LEVEL)) | |
219 | return THERMAL_CSTATE_INVALID; | |
79491e53 | 220 | |
57df8106 ZR |
221 | return (unsigned long)val; |
222 | } | |
243dbd9c | 223 | EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level); |
57df8106 | 224 | |
02361418 ADK |
225 | /** |
226 | * cpufreq_thermal_notifier - notifier callback for cpufreq policy change. | |
227 | * @nb: struct notifier_block * with callback info. | |
228 | * @event: value showing cpufreq event for which this function invoked. | |
229 | * @data: callback-specific data | |
bab30554 | 230 | * |
9746b6e7 | 231 | * Callback to hijack the notification on cpufreq policy transition. |
bab30554 EV |
232 | * Every time there is a change in policy, we will intercept and |
233 | * update the cpufreq policy with thermal constraints. | |
234 | * | |
235 | * Return: 0 (success) | |
02361418 ADK |
236 | */ |
237 | static int cpufreq_thermal_notifier(struct notifier_block *nb, | |
5fda7f68 | 238 | unsigned long event, void *data) |
02361418 ADK |
239 | { |
240 | struct cpufreq_policy *policy = data; | |
241 | unsigned long max_freq = 0; | |
2dcd851f | 242 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 243 | |
2dcd851f | 244 | if (event != CPUFREQ_ADJUST) |
02361418 ADK |
245 | return 0; |
246 | ||
2dcd851f YSB |
247 | mutex_lock(&cooling_cpufreq_lock); |
248 | list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) { | |
249 | if (!cpumask_test_cpu(policy->cpu, | |
250 | &cpufreq_dev->allowed_cpus)) | |
251 | continue; | |
252 | ||
2dcd851f | 253 | max_freq = cpufreq_dev->cpufreq_val; |
02361418 | 254 | |
2dcd851f YSB |
255 | if (policy->max != max_freq) |
256 | cpufreq_verify_within_limits(policy, 0, max_freq); | |
257 | } | |
258 | mutex_unlock(&cooling_cpufreq_lock); | |
02361418 ADK |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
1b9e3526 | 263 | /* cpufreq cooling device callback functions are defined below */ |
02361418 ADK |
264 | |
265 | /** | |
266 | * cpufreq_get_max_state - callback function to get the max cooling state. | |
267 | * @cdev: thermal cooling device pointer. | |
268 | * @state: fill this variable with the max cooling state. | |
62c00421 EV |
269 | * |
270 | * Callback for the thermal cooling device to return the cpufreq | |
271 | * max cooling state. | |
272 | * | |
273 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
274 | */ |
275 | static int cpufreq_get_max_state(struct thermal_cooling_device *cdev, | |
276 | unsigned long *state) | |
277 | { | |
160b7d80 | 278 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 279 | |
dcc6c7fd VK |
280 | *state = cpufreq_device->max_level; |
281 | return 0; | |
02361418 ADK |
282 | } |
283 | ||
284 | /** | |
285 | * cpufreq_get_cur_state - callback function to get the current cooling state. | |
286 | * @cdev: thermal cooling device pointer. | |
287 | * @state: fill this variable with the current cooling state. | |
3672552d EV |
288 | * |
289 | * Callback for the thermal cooling device to return the cpufreq | |
290 | * current cooling state. | |
291 | * | |
292 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
293 | */ |
294 | static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev, | |
295 | unsigned long *state) | |
296 | { | |
160b7d80 | 297 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
02361418 | 298 | |
160b7d80 | 299 | *state = cpufreq_device->cpufreq_state; |
79491e53 | 300 | |
160b7d80 | 301 | return 0; |
02361418 ADK |
302 | } |
303 | ||
304 | /** | |
305 | * cpufreq_set_cur_state - callback function to set the current cooling state. | |
306 | * @cdev: thermal cooling device pointer. | |
307 | * @state: set this variable to the current cooling state. | |
56e05fdb EV |
308 | * |
309 | * Callback for the thermal cooling device to change the cpufreq | |
310 | * current cooling state. | |
311 | * | |
312 | * Return: 0 on success, an error code otherwise. | |
02361418 ADK |
313 | */ |
314 | static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev, | |
315 | unsigned long state) | |
316 | { | |
160b7d80 | 317 | struct cpufreq_cooling_device *cpufreq_device = cdev->devdata; |
5194fe46 VK |
318 | unsigned int cpu = cpumask_any(&cpufreq_device->allowed_cpus); |
319 | unsigned int clip_freq; | |
521a2e58 | 320 | int ret; |
5194fe46 VK |
321 | |
322 | /* Check if the old cooling action is same as new cooling action */ | |
323 | if (cpufreq_device->cpufreq_state == state) | |
324 | return 0; | |
02361418 | 325 | |
521a2e58 VK |
326 | ret = get_property(cpu, state, &clip_freq, GET_FREQ); |
327 | if (ret) | |
328 | return ret; | |
5194fe46 VK |
329 | |
330 | cpufreq_device->cpufreq_state = state; | |
331 | cpufreq_device->cpufreq_val = clip_freq; | |
332 | ||
333 | cpufreq_update_policy(cpu); | |
334 | ||
335 | return 0; | |
02361418 ADK |
336 | } |
337 | ||
338 | /* Bind cpufreq callbacks to thermal cooling device ops */ | |
339 | static struct thermal_cooling_device_ops const cpufreq_cooling_ops = { | |
340 | .get_max_state = cpufreq_get_max_state, | |
341 | .get_cur_state = cpufreq_get_cur_state, | |
342 | .set_cur_state = cpufreq_set_cur_state, | |
343 | }; | |
344 | ||
345 | /* Notifier for cpufreq policy change */ | |
346 | static struct notifier_block thermal_cpufreq_notifier_block = { | |
347 | .notifier_call = cpufreq_thermal_notifier, | |
348 | }; | |
349 | ||
350 | /** | |
39d99cff EV |
351 | * __cpufreq_cooling_register - helper function to create cpufreq cooling device |
352 | * @np: a valid struct device_node to the cooling device device tree node | |
02361418 | 353 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. |
405fb825 | 354 | * Normally this should be same as cpufreq policy->related_cpus. |
12cb08ba EV |
355 | * |
356 | * This interface function registers the cpufreq cooling device with the name | |
357 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
39d99cff EV |
358 | * cooling devices. It also gives the opportunity to link the cooling device |
359 | * with a device tree node, in order to bind it via the thermal DT code. | |
12cb08ba EV |
360 | * |
361 | * Return: a valid struct thermal_cooling_device pointer on success, | |
362 | * on failure, it returns a corresponding ERR_PTR(). | |
02361418 | 363 | */ |
39d99cff EV |
364 | static struct thermal_cooling_device * |
365 | __cpufreq_cooling_register(struct device_node *np, | |
366 | const struct cpumask *clip_cpus) | |
02361418 ADK |
367 | { |
368 | struct thermal_cooling_device *cool_dev; | |
5d3bdb89 | 369 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 370 | char dev_name[THERMAL_NAME_LENGTH]; |
dcc6c7fd | 371 | struct cpufreq_frequency_table *pos, *table; |
405fb825 | 372 | int ret; |
02361418 | 373 | |
dcc6c7fd VK |
374 | table = cpufreq_frequency_get_table(cpumask_first(clip_cpus)); |
375 | if (!table) { | |
0f1be51c EV |
376 | pr_debug("%s: CPUFreq table not found\n", __func__); |
377 | return ERR_PTR(-EPROBE_DEFER); | |
378 | } | |
379 | ||
98d522f0 | 380 | cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL); |
02361418 ADK |
381 | if (!cpufreq_dev) |
382 | return ERR_PTR(-ENOMEM); | |
383 | ||
521a2e58 VK |
384 | ret = get_property(cpumask_any(clip_cpus), 0, &cpufreq_dev->cpufreq_val, |
385 | GET_FREQ); | |
386 | if (ret) { | |
387 | pr_err("%s: Failed to get frequency: %d", __func__, ret); | |
388 | cool_dev = ERR_PTR(ret); | |
7adb635b VK |
389 | goto free_cdev; |
390 | } | |
391 | ||
dcc6c7fd VK |
392 | /* Find max levels */ |
393 | cpufreq_for_each_valid_entry(pos, table) | |
394 | cpufreq_dev->max_level++; | |
395 | ||
396 | /* max_level is an index, not a counter */ | |
397 | cpufreq_dev->max_level--; | |
398 | ||
02361418 ADK |
399 | cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus); |
400 | ||
02361418 ADK |
401 | ret = get_idr(&cpufreq_idr, &cpufreq_dev->id); |
402 | if (ret) { | |
730abe06 VK |
403 | cool_dev = ERR_PTR(ret); |
404 | goto free_cdev; | |
02361418 ADK |
405 | } |
406 | ||
99871a71 EV |
407 | snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d", |
408 | cpufreq_dev->id); | |
02361418 | 409 | |
39d99cff EV |
410 | cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev, |
411 | &cpufreq_cooling_ops); | |
730abe06 VK |
412 | if (IS_ERR(cool_dev)) |
413 | goto remove_idr; | |
414 | ||
02361418 | 415 | cpufreq_dev->cool_dev = cool_dev; |
92e615ec | 416 | |
02361418 | 417 | mutex_lock(&cooling_cpufreq_lock); |
02361418 ADK |
418 | |
419 | /* Register the notifier for first cpufreq cooling device */ | |
2479bb64 | 420 | if (list_empty(&cpufreq_dev_list)) |
02361418 | 421 | cpufreq_register_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 422 | CPUFREQ_POLICY_NOTIFIER); |
2dcd851f | 423 | list_add(&cpufreq_dev->node, &cpufreq_dev_list); |
02361418 ADK |
424 | |
425 | mutex_unlock(&cooling_cpufreq_lock); | |
79491e53 | 426 | |
730abe06 VK |
427 | return cool_dev; |
428 | ||
429 | remove_idr: | |
430 | release_idr(&cpufreq_idr, cpufreq_dev->id); | |
431 | free_cdev: | |
432 | kfree(cpufreq_dev); | |
433 | ||
02361418 ADK |
434 | return cool_dev; |
435 | } | |
39d99cff EV |
436 | |
437 | /** | |
438 | * cpufreq_cooling_register - function to create cpufreq cooling device. | |
439 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
440 | * | |
441 | * This interface function registers the cpufreq cooling device with the name | |
442 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
443 | * cooling devices. | |
444 | * | |
445 | * Return: a valid struct thermal_cooling_device pointer on success, | |
446 | * on failure, it returns a corresponding ERR_PTR(). | |
447 | */ | |
448 | struct thermal_cooling_device * | |
449 | cpufreq_cooling_register(const struct cpumask *clip_cpus) | |
450 | { | |
451 | return __cpufreq_cooling_register(NULL, clip_cpus); | |
452 | } | |
243dbd9c | 453 | EXPORT_SYMBOL_GPL(cpufreq_cooling_register); |
02361418 | 454 | |
39d99cff EV |
455 | /** |
456 | * of_cpufreq_cooling_register - function to create cpufreq cooling device. | |
457 | * @np: a valid struct device_node to the cooling device device tree node | |
458 | * @clip_cpus: cpumask of cpus where the frequency constraints will happen. | |
459 | * | |
460 | * This interface function registers the cpufreq cooling device with the name | |
461 | * "thermal-cpufreq-%x". This api can support multiple instances of cpufreq | |
462 | * cooling devices. Using this API, the cpufreq cooling device will be | |
463 | * linked to the device tree node provided. | |
464 | * | |
465 | * Return: a valid struct thermal_cooling_device pointer on success, | |
466 | * on failure, it returns a corresponding ERR_PTR(). | |
467 | */ | |
468 | struct thermal_cooling_device * | |
469 | of_cpufreq_cooling_register(struct device_node *np, | |
470 | const struct cpumask *clip_cpus) | |
471 | { | |
472 | if (!np) | |
473 | return ERR_PTR(-EINVAL); | |
474 | ||
475 | return __cpufreq_cooling_register(np, clip_cpus); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register); | |
478 | ||
02361418 ADK |
479 | /** |
480 | * cpufreq_cooling_unregister - function to remove cpufreq cooling device. | |
481 | * @cdev: thermal cooling device pointer. | |
135266b4 EV |
482 | * |
483 | * This interface function unregisters the "thermal-cpufreq-%x" cooling device. | |
02361418 ADK |
484 | */ |
485 | void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev) | |
486 | { | |
50e66c7e | 487 | struct cpufreq_cooling_device *cpufreq_dev; |
02361418 | 488 | |
50e66c7e EV |
489 | if (!cdev) |
490 | return; | |
491 | ||
492 | cpufreq_dev = cdev->devdata; | |
02361418 | 493 | mutex_lock(&cooling_cpufreq_lock); |
2dcd851f | 494 | list_del(&cpufreq_dev->node); |
02361418 ADK |
495 | |
496 | /* Unregister the notifier for the last cpufreq cooling device */ | |
2479bb64 | 497 | if (list_empty(&cpufreq_dev_list)) |
02361418 | 498 | cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block, |
5fda7f68 | 499 | CPUFREQ_POLICY_NOTIFIER); |
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); |