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a76caf55 ØE |
1 | /* |
2 | * devfreq_cooling: Thermal cooling device implementation for devices using | |
3 | * devfreq | |
4 | * | |
5 | * Copyright (C) 2014-2015 ARM Limited | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
12 | * kind, whether express or implied; without even the implied warranty | |
13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * TODO: | |
17 | * - If OPPs are added or removed after devfreq cooling has | |
18 | * registered, the devfreq cooling won't react to it. | |
19 | */ | |
20 | ||
21 | #include <linux/devfreq.h> | |
22 | #include <linux/devfreq_cooling.h> | |
23 | #include <linux/export.h> | |
2f96c035 | 24 | #include <linux/idr.h> |
a76caf55 ØE |
25 | #include <linux/slab.h> |
26 | #include <linux/pm_opp.h> | |
27 | #include <linux/thermal.h> | |
28 | ||
9876b1a4 JM |
29 | #include <trace/events/thermal.h> |
30 | ||
2be83da8 LL |
31 | #define SCALE_ERROR_MITIGATION 100 |
32 | ||
2f96c035 | 33 | static DEFINE_IDA(devfreq_ida); |
a76caf55 ØE |
34 | |
35 | /** | |
36 | * struct devfreq_cooling_device - Devfreq cooling device | |
37 | * @id: unique integer value corresponding to each | |
38 | * devfreq_cooling_device registered. | |
39 | * @cdev: Pointer to associated thermal cooling device. | |
40 | * @devfreq: Pointer to associated devfreq device. | |
41 | * @cooling_state: Current cooling state. | |
42 | * @power_table: Pointer to table with maximum power draw for each | |
43 | * cooling state. State is the index into the table, and | |
44 | * the power is in mW. | |
45 | * @freq_table: Pointer to a table with the frequencies sorted in descending | |
46 | * order. You can index the table by cooling device state | |
47 | * @freq_table_size: Size of the @freq_table and @power_table | |
48 | * @power_ops: Pointer to devfreq_cooling_power, used to generate the | |
49 | * @power_table. | |
2be83da8 LL |
50 | * @res_util: Resource utilization scaling factor for the power. |
51 | * It is multiplied by 100 to minimize the error. It is used | |
52 | * for estimation of the power budget instead of using | |
53 | * 'utilization' (which is 'busy_time / 'total_time'). | |
54 | * The 'res_util' range is from 100 to (power_table[state] * 100) | |
55 | * for the corresponding 'state'. | |
a76caf55 ØE |
56 | */ |
57 | struct devfreq_cooling_device { | |
58 | int id; | |
59 | struct thermal_cooling_device *cdev; | |
60 | struct devfreq *devfreq; | |
61 | unsigned long cooling_state; | |
62 | u32 *power_table; | |
63 | u32 *freq_table; | |
64 | size_t freq_table_size; | |
65 | struct devfreq_cooling_power *power_ops; | |
2be83da8 LL |
66 | u32 res_util; |
67 | int capped_state; | |
a76caf55 ØE |
68 | }; |
69 | ||
a76caf55 ØE |
70 | /** |
71 | * partition_enable_opps() - disable all opps above a given state | |
72 | * @dfc: Pointer to devfreq we are operating on | |
73 | * @cdev_state: cooling device state we're setting | |
74 | * | |
75 | * Go through the OPPs of the device, enabling all OPPs until | |
76 | * @cdev_state and disabling those frequencies above it. | |
77 | */ | |
78 | static int partition_enable_opps(struct devfreq_cooling_device *dfc, | |
79 | unsigned long cdev_state) | |
80 | { | |
81 | int i; | |
82 | struct device *dev = dfc->devfreq->dev.parent; | |
83 | ||
84 | for (i = 0; i < dfc->freq_table_size; i++) { | |
85 | struct dev_pm_opp *opp; | |
86 | int ret = 0; | |
87 | unsigned int freq = dfc->freq_table[i]; | |
88 | bool want_enable = i >= cdev_state ? true : false; | |
89 | ||
a76caf55 | 90 | opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable); |
a76caf55 ØE |
91 | |
92 | if (PTR_ERR(opp) == -ERANGE) | |
93 | continue; | |
94 | else if (IS_ERR(opp)) | |
95 | return PTR_ERR(opp); | |
96 | ||
8a31d9d9 VK |
97 | dev_pm_opp_put(opp); |
98 | ||
a76caf55 ØE |
99 | if (want_enable) |
100 | ret = dev_pm_opp_enable(dev, freq); | |
101 | else | |
102 | ret = dev_pm_opp_disable(dev, freq); | |
103 | ||
104 | if (ret) | |
105 | return ret; | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int devfreq_cooling_get_max_state(struct thermal_cooling_device *cdev, | |
112 | unsigned long *state) | |
113 | { | |
114 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
115 | ||
116 | *state = dfc->freq_table_size - 1; | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int devfreq_cooling_get_cur_state(struct thermal_cooling_device *cdev, | |
122 | unsigned long *state) | |
123 | { | |
124 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
125 | ||
126 | *state = dfc->cooling_state; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int devfreq_cooling_set_cur_state(struct thermal_cooling_device *cdev, | |
132 | unsigned long state) | |
133 | { | |
134 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
135 | struct devfreq *df = dfc->devfreq; | |
136 | struct device *dev = df->dev.parent; | |
137 | int ret; | |
138 | ||
139 | if (state == dfc->cooling_state) | |
140 | return 0; | |
141 | ||
142 | dev_dbg(dev, "Setting cooling state %lu\n", state); | |
143 | ||
144 | if (state >= dfc->freq_table_size) | |
145 | return -EINVAL; | |
146 | ||
147 | ret = partition_enable_opps(dfc, state); | |
148 | if (ret) | |
149 | return ret; | |
150 | ||
151 | dfc->cooling_state = state; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | /** | |
157 | * freq_get_state() - get the cooling state corresponding to a frequency | |
158 | * @dfc: Pointer to devfreq cooling device | |
159 | * @freq: frequency in Hz | |
160 | * | |
161 | * Return: the cooling state associated with the @freq, or | |
162 | * THERMAL_CSTATE_INVALID if it wasn't found. | |
163 | */ | |
164 | static unsigned long | |
165 | freq_get_state(struct devfreq_cooling_device *dfc, unsigned long freq) | |
166 | { | |
167 | int i; | |
168 | ||
169 | for (i = 0; i < dfc->freq_table_size; i++) { | |
170 | if (dfc->freq_table[i] == freq) | |
171 | return i; | |
172 | } | |
173 | ||
174 | return THERMAL_CSTATE_INVALID; | |
175 | } | |
176 | ||
e34cab4c | 177 | static unsigned long get_voltage(struct devfreq *df, unsigned long freq) |
a76caf55 | 178 | { |
a76caf55 ØE |
179 | struct device *dev = df->dev.parent; |
180 | unsigned long voltage; | |
181 | struct dev_pm_opp *opp; | |
182 | ||
a76caf55 | 183 | opp = dev_pm_opp_find_freq_exact(dev, freq, true); |
a4e49c9b | 184 | if (PTR_ERR(opp) == -ERANGE) |
a76caf55 ØE |
185 | opp = dev_pm_opp_find_freq_exact(dev, freq, false); |
186 | ||
afd1f4e0 VK |
187 | if (IS_ERR(opp)) { |
188 | dev_err_ratelimited(dev, "Failed to find OPP for frequency %lu: %ld\n", | |
189 | freq, PTR_ERR(opp)); | |
190 | return 0; | |
191 | } | |
192 | ||
a76caf55 | 193 | voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */ |
8a31d9d9 | 194 | dev_pm_opp_put(opp); |
a76caf55 ØE |
195 | |
196 | if (voltage == 0) { | |
8327b830 | 197 | dev_err_ratelimited(dev, |
afd1f4e0 VK |
198 | "Failed to get voltage for frequency %lu\n", |
199 | freq); | |
a76caf55 ØE |
200 | } |
201 | ||
e34cab4c LL |
202 | return voltage; |
203 | } | |
204 | ||
205 | /** | |
206 | * get_static_power() - calculate the static power | |
207 | * @dfc: Pointer to devfreq cooling device | |
208 | * @freq: Frequency in Hz | |
209 | * | |
210 | * Calculate the static power in milliwatts using the supplied | |
211 | * get_static_power(). The current voltage is calculated using the | |
212 | * OPP library. If no get_static_power() was supplied, assume the | |
213 | * static power is negligible. | |
214 | */ | |
215 | static unsigned long | |
216 | get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq) | |
217 | { | |
218 | struct devfreq *df = dfc->devfreq; | |
219 | unsigned long voltage; | |
220 | ||
221 | if (!dfc->power_ops->get_static_power) | |
222 | return 0; | |
223 | ||
224 | voltage = get_voltage(df, freq); | |
225 | ||
226 | if (voltage == 0) | |
227 | return 0; | |
228 | ||
3aa53743 | 229 | return dfc->power_ops->get_static_power(df, voltage); |
a76caf55 ØE |
230 | } |
231 | ||
232 | /** | |
233 | * get_dynamic_power - calculate the dynamic power | |
234 | * @dfc: Pointer to devfreq cooling device | |
235 | * @freq: Frequency in Hz | |
236 | * @voltage: Voltage in millivolts | |
237 | * | |
238 | * Calculate the dynamic power in milliwatts consumed by the device at | |
239 | * frequency @freq and voltage @voltage. If the get_dynamic_power() | |
240 | * was supplied as part of the devfreq_cooling_power struct, then that | |
241 | * function is used. Otherwise, a simple power model (Pdyn = Coeff * | |
242 | * Voltage^2 * Frequency) is used. | |
243 | */ | |
244 | static unsigned long | |
245 | get_dynamic_power(struct devfreq_cooling_device *dfc, unsigned long freq, | |
246 | unsigned long voltage) | |
247 | { | |
61c8e8aa | 248 | u64 power; |
a76caf55 ØE |
249 | u32 freq_mhz; |
250 | struct devfreq_cooling_power *dfc_power = dfc->power_ops; | |
251 | ||
252 | if (dfc_power->get_dynamic_power) | |
3aa53743 JM |
253 | return dfc_power->get_dynamic_power(dfc->devfreq, freq, |
254 | voltage); | |
a76caf55 ØE |
255 | |
256 | freq_mhz = freq / 1000000; | |
257 | power = (u64)dfc_power->dyn_power_coeff * freq_mhz * voltage * voltage; | |
258 | do_div(power, 1000000000); | |
259 | ||
260 | return power; | |
261 | } | |
262 | ||
2be83da8 LL |
263 | |
264 | static inline unsigned long get_total_power(struct devfreq_cooling_device *dfc, | |
265 | unsigned long freq, | |
266 | unsigned long voltage) | |
267 | { | |
268 | return get_static_power(dfc, freq) + get_dynamic_power(dfc, freq, | |
269 | voltage); | |
270 | } | |
271 | ||
272 | ||
a76caf55 ØE |
273 | static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cdev, |
274 | struct thermal_zone_device *tz, | |
275 | u32 *power) | |
276 | { | |
277 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
278 | struct devfreq *df = dfc->devfreq; | |
279 | struct devfreq_dev_status *status = &df->last_status; | |
280 | unsigned long state; | |
281 | unsigned long freq = status->current_frequency; | |
2be83da8 LL |
282 | unsigned long voltage; |
283 | u32 dyn_power = 0; | |
284 | u32 static_power = 0; | |
285 | int res; | |
a76caf55 | 286 | |
a76caf55 | 287 | state = freq_get_state(dfc, freq); |
2be83da8 LL |
288 | if (state == THERMAL_CSTATE_INVALID) { |
289 | res = -EAGAIN; | |
290 | goto fail; | |
291 | } | |
a76caf55 | 292 | |
2be83da8 LL |
293 | if (dfc->power_ops->get_real_power) { |
294 | voltage = get_voltage(df, freq); | |
295 | if (voltage == 0) { | |
296 | res = -EINVAL; | |
297 | goto fail; | |
298 | } | |
a76caf55 | 299 | |
2be83da8 LL |
300 | res = dfc->power_ops->get_real_power(df, power, freq, voltage); |
301 | if (!res) { | |
302 | state = dfc->capped_state; | |
303 | dfc->res_util = dfc->power_table[state]; | |
304 | dfc->res_util *= SCALE_ERROR_MITIGATION; | |
a76caf55 | 305 | |
2be83da8 LL |
306 | if (*power > 1) |
307 | dfc->res_util /= *power; | |
308 | } else { | |
309 | goto fail; | |
310 | } | |
311 | } else { | |
312 | dyn_power = dfc->power_table[state]; | |
313 | ||
314 | /* Scale dynamic power for utilization */ | |
315 | dyn_power *= status->busy_time; | |
316 | dyn_power /= status->total_time; | |
317 | /* Get static power */ | |
318 | static_power = get_static_power(dfc, freq); | |
319 | ||
320 | *power = dyn_power + static_power; | |
321 | } | |
a76caf55 | 322 | |
9876b1a4 | 323 | trace_thermal_power_devfreq_get_power(cdev, status, freq, dyn_power, |
771ffa14 | 324 | static_power, *power); |
9876b1a4 | 325 | |
a76caf55 | 326 | return 0; |
2be83da8 LL |
327 | fail: |
328 | /* It is safe to set max in this case */ | |
329 | dfc->res_util = SCALE_ERROR_MITIGATION; | |
330 | return res; | |
a76caf55 ØE |
331 | } |
332 | ||
333 | static int devfreq_cooling_state2power(struct thermal_cooling_device *cdev, | |
334 | struct thermal_zone_device *tz, | |
335 | unsigned long state, | |
336 | u32 *power) | |
337 | { | |
338 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
339 | unsigned long freq; | |
340 | u32 static_power; | |
341 | ||
e3da1cbe | 342 | if (state >= dfc->freq_table_size) |
a76caf55 ØE |
343 | return -EINVAL; |
344 | ||
345 | freq = dfc->freq_table[state]; | |
346 | static_power = get_static_power(dfc, freq); | |
347 | ||
348 | *power = dfc->power_table[state] + static_power; | |
349 | return 0; | |
350 | } | |
351 | ||
352 | static int devfreq_cooling_power2state(struct thermal_cooling_device *cdev, | |
353 | struct thermal_zone_device *tz, | |
354 | u32 power, unsigned long *state) | |
355 | { | |
356 | struct devfreq_cooling_device *dfc = cdev->devdata; | |
357 | struct devfreq *df = dfc->devfreq; | |
358 | struct devfreq_dev_status *status = &df->last_status; | |
359 | unsigned long freq = status->current_frequency; | |
360 | unsigned long busy_time; | |
361 | s32 dyn_power; | |
362 | u32 static_power; | |
2be83da8 | 363 | s32 est_power; |
a76caf55 ØE |
364 | int i; |
365 | ||
2be83da8 LL |
366 | if (dfc->power_ops->get_real_power) { |
367 | /* Scale for resource utilization */ | |
368 | est_power = power * dfc->res_util; | |
369 | est_power /= SCALE_ERROR_MITIGATION; | |
370 | } else { | |
371 | static_power = get_static_power(dfc, freq); | |
a76caf55 | 372 | |
2be83da8 LL |
373 | dyn_power = power - static_power; |
374 | dyn_power = dyn_power > 0 ? dyn_power : 0; | |
a76caf55 | 375 | |
2be83da8 LL |
376 | /* Scale dynamic power for utilization */ |
377 | busy_time = status->busy_time ?: 1; | |
378 | est_power = (dyn_power * status->total_time) / busy_time; | |
379 | } | |
a76caf55 ØE |
380 | |
381 | /* | |
382 | * Find the first cooling state that is within the power | |
383 | * budget for dynamic power. | |
384 | */ | |
385 | for (i = 0; i < dfc->freq_table_size - 1; i++) | |
2be83da8 | 386 | if (est_power >= dfc->power_table[i]) |
a76caf55 ØE |
387 | break; |
388 | ||
389 | *state = i; | |
2be83da8 | 390 | dfc->capped_state = i; |
9876b1a4 | 391 | trace_thermal_power_devfreq_limit(cdev, freq, *state, power); |
a76caf55 ØE |
392 | return 0; |
393 | } | |
394 | ||
395 | static struct thermal_cooling_device_ops devfreq_cooling_ops = { | |
396 | .get_max_state = devfreq_cooling_get_max_state, | |
397 | .get_cur_state = devfreq_cooling_get_cur_state, | |
398 | .set_cur_state = devfreq_cooling_set_cur_state, | |
399 | }; | |
400 | ||
401 | /** | |
402 | * devfreq_cooling_gen_tables() - Generate power and freq tables. | |
403 | * @dfc: Pointer to devfreq cooling device. | |
404 | * | |
405 | * Generate power and frequency tables: the power table hold the | |
406 | * device's maximum power usage at each cooling state (OPP). The | |
407 | * static and dynamic power using the appropriate voltage and | |
408 | * frequency for the state, is acquired from the struct | |
409 | * devfreq_cooling_power, and summed to make the maximum power draw. | |
410 | * | |
411 | * The frequency table holds the frequencies in descending order. | |
412 | * That way its indexed by cooling device state. | |
413 | * | |
414 | * The tables are malloced, and pointers put in dfc. They must be | |
415 | * freed when unregistering the devfreq cooling device. | |
416 | * | |
417 | * Return: 0 on success, negative error code on failure. | |
418 | */ | |
419 | static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc) | |
420 | { | |
421 | struct devfreq *df = dfc->devfreq; | |
422 | struct device *dev = df->dev.parent; | |
423 | int ret, num_opps; | |
424 | unsigned long freq; | |
425 | u32 *power_table = NULL; | |
426 | u32 *freq_table; | |
427 | int i; | |
428 | ||
429 | num_opps = dev_pm_opp_get_opp_count(dev); | |
430 | ||
431 | if (dfc->power_ops) { | |
432 | power_table = kcalloc(num_opps, sizeof(*power_table), | |
433 | GFP_KERNEL); | |
434 | if (!power_table) | |
ce5ee161 | 435 | return -ENOMEM; |
a76caf55 ØE |
436 | } |
437 | ||
438 | freq_table = kcalloc(num_opps, sizeof(*freq_table), | |
439 | GFP_KERNEL); | |
440 | if (!freq_table) { | |
441 | ret = -ENOMEM; | |
442 | goto free_power_table; | |
443 | } | |
444 | ||
445 | for (i = 0, freq = ULONG_MAX; i < num_opps; i++, freq--) { | |
2be83da8 | 446 | unsigned long power, voltage; |
a76caf55 ØE |
447 | struct dev_pm_opp *opp; |
448 | ||
a76caf55 ØE |
449 | opp = dev_pm_opp_find_freq_floor(dev, &freq); |
450 | if (IS_ERR(opp)) { | |
a76caf55 ØE |
451 | ret = PTR_ERR(opp); |
452 | goto free_tables; | |
453 | } | |
454 | ||
455 | voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */ | |
8a31d9d9 | 456 | dev_pm_opp_put(opp); |
a76caf55 ØE |
457 | |
458 | if (dfc->power_ops) { | |
2be83da8 LL |
459 | if (dfc->power_ops->get_real_power) |
460 | power = get_total_power(dfc, freq, voltage); | |
461 | else | |
462 | power = get_dynamic_power(dfc, freq, voltage); | |
a76caf55 | 463 | |
2be83da8 LL |
464 | dev_dbg(dev, "Power table: %lu MHz @ %lu mV: %lu = %lu mW\n", |
465 | freq / 1000000, voltage, power, power); | |
a76caf55 | 466 | |
2be83da8 | 467 | power_table[i] = power; |
a76caf55 ØE |
468 | } |
469 | ||
470 | freq_table[i] = freq; | |
471 | } | |
472 | ||
473 | if (dfc->power_ops) | |
474 | dfc->power_table = power_table; | |
475 | ||
476 | dfc->freq_table = freq_table; | |
477 | dfc->freq_table_size = num_opps; | |
478 | ||
479 | return 0; | |
480 | ||
481 | free_tables: | |
482 | kfree(freq_table); | |
483 | free_power_table: | |
484 | kfree(power_table); | |
485 | ||
486 | return ret; | |
487 | } | |
488 | ||
489 | /** | |
490 | * of_devfreq_cooling_register_power() - Register devfreq cooling device, | |
491 | * with OF and power information. | |
492 | * @np: Pointer to OF device_node. | |
493 | * @df: Pointer to devfreq device. | |
494 | * @dfc_power: Pointer to devfreq_cooling_power. | |
495 | * | |
496 | * Register a devfreq cooling device. The available OPPs must be | |
497 | * registered on the device. | |
498 | * | |
499 | * If @dfc_power is provided, the cooling device is registered with the | |
500 | * power extensions. For the power extensions to work correctly, | |
501 | * devfreq should use the simple_ondemand governor, other governors | |
502 | * are not currently supported. | |
503 | */ | |
3c99c2ce | 504 | struct thermal_cooling_device * |
a76caf55 ØE |
505 | of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, |
506 | struct devfreq_cooling_power *dfc_power) | |
507 | { | |
508 | struct thermal_cooling_device *cdev; | |
509 | struct devfreq_cooling_device *dfc; | |
510 | char dev_name[THERMAL_NAME_LENGTH]; | |
511 | int err; | |
512 | ||
513 | dfc = kzalloc(sizeof(*dfc), GFP_KERNEL); | |
514 | if (!dfc) | |
515 | return ERR_PTR(-ENOMEM); | |
516 | ||
517 | dfc->devfreq = df; | |
518 | ||
519 | if (dfc_power) { | |
520 | dfc->power_ops = dfc_power; | |
521 | ||
522 | devfreq_cooling_ops.get_requested_power = | |
523 | devfreq_cooling_get_requested_power; | |
524 | devfreq_cooling_ops.state2power = devfreq_cooling_state2power; | |
525 | devfreq_cooling_ops.power2state = devfreq_cooling_power2state; | |
526 | } | |
527 | ||
528 | err = devfreq_cooling_gen_tables(dfc); | |
529 | if (err) | |
530 | goto free_dfc; | |
531 | ||
2f96c035 MW |
532 | err = ida_simple_get(&devfreq_ida, 0, 0, GFP_KERNEL); |
533 | if (err < 0) | |
a76caf55 | 534 | goto free_tables; |
2f96c035 | 535 | dfc->id = err; |
a76caf55 ØE |
536 | |
537 | snprintf(dev_name, sizeof(dev_name), "thermal-devfreq-%d", dfc->id); | |
538 | ||
539 | cdev = thermal_of_cooling_device_register(np, dev_name, dfc, | |
540 | &devfreq_cooling_ops); | |
541 | if (IS_ERR(cdev)) { | |
542 | err = PTR_ERR(cdev); | |
543 | dev_err(df->dev.parent, | |
544 | "Failed to register devfreq cooling device (%d)\n", | |
545 | err); | |
2f96c035 | 546 | goto release_ida; |
a76caf55 ØE |
547 | } |
548 | ||
549 | dfc->cdev = cdev; | |
550 | ||
3c99c2ce | 551 | return cdev; |
a76caf55 | 552 | |
2f96c035 MW |
553 | release_ida: |
554 | ida_simple_remove(&devfreq_ida, dfc->id); | |
a76caf55 ØE |
555 | free_tables: |
556 | kfree(dfc->power_table); | |
557 | kfree(dfc->freq_table); | |
558 | free_dfc: | |
559 | kfree(dfc); | |
560 | ||
561 | return ERR_PTR(err); | |
562 | } | |
563 | EXPORT_SYMBOL_GPL(of_devfreq_cooling_register_power); | |
564 | ||
565 | /** | |
566 | * of_devfreq_cooling_register() - Register devfreq cooling device, | |
567 | * with OF information. | |
568 | * @np: Pointer to OF device_node. | |
569 | * @df: Pointer to devfreq device. | |
570 | */ | |
3c99c2ce | 571 | struct thermal_cooling_device * |
a76caf55 ØE |
572 | of_devfreq_cooling_register(struct device_node *np, struct devfreq *df) |
573 | { | |
574 | return of_devfreq_cooling_register_power(np, df, NULL); | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(of_devfreq_cooling_register); | |
577 | ||
578 | /** | |
579 | * devfreq_cooling_register() - Register devfreq cooling device. | |
580 | * @df: Pointer to devfreq device. | |
581 | */ | |
3c99c2ce | 582 | struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df) |
a76caf55 ØE |
583 | { |
584 | return of_devfreq_cooling_register(NULL, df); | |
585 | } | |
586 | EXPORT_SYMBOL_GPL(devfreq_cooling_register); | |
587 | ||
588 | /** | |
589 | * devfreq_cooling_unregister() - Unregister devfreq cooling device. | |
590 | * @dfc: Pointer to devfreq cooling device to unregister. | |
591 | */ | |
3c99c2ce | 592 | void devfreq_cooling_unregister(struct thermal_cooling_device *cdev) |
a76caf55 | 593 | { |
3c99c2ce JM |
594 | struct devfreq_cooling_device *dfc; |
595 | ||
596 | if (!cdev) | |
a76caf55 ØE |
597 | return; |
598 | ||
3c99c2ce JM |
599 | dfc = cdev->devdata; |
600 | ||
a76caf55 | 601 | thermal_cooling_device_unregister(dfc->cdev); |
2f96c035 | 602 | ida_simple_remove(&devfreq_ida, dfc->id); |
a76caf55 ØE |
603 | kfree(dfc->power_table); |
604 | kfree(dfc->freq_table); | |
605 | ||
606 | kfree(dfc); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(devfreq_cooling_unregister); |