]>
Commit | Line | Data |
---|---|---|
a3c98b8b MH |
1 | /* |
2 | * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework | |
3 | * for Non-CPU Devices. | |
4 | * | |
5 | * Copyright (C) 2011 Samsung Electronics | |
6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
23c7b54c | 14 | #include <linux/kmod.h> |
a3c98b8b MH |
15 | #include <linux/sched.h> |
16 | #include <linux/errno.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/init.h> | |
417dc4bb | 19 | #include <linux/export.h> |
a3c98b8b | 20 | #include <linux/slab.h> |
952f6d13 | 21 | #include <linux/stat.h> |
e4db1c74 | 22 | #include <linux/pm_opp.h> |
a3c98b8b MH |
23 | #include <linux/devfreq.h> |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/printk.h> | |
28 | #include <linux/hrtimer.h> | |
8f510aeb | 29 | #include <linux/of.h> |
a3c98b8b MH |
30 | #include "governor.h" |
31 | ||
1a1357ea | 32 | static struct class *devfreq_class; |
a3c98b8b MH |
33 | |
34 | /* | |
7e6fdd4b RV |
35 | * devfreq core provides delayed work based load monitoring helper |
36 | * functions. Governors can use these or can implement their own | |
37 | * monitoring mechanism. | |
a3c98b8b | 38 | */ |
a3c98b8b | 39 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 40 | |
3aa173b8 NM |
41 | /* The list of all device-devfreq governors */ |
42 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
43 | /* The list of all device-devfreq */ |
44 | static LIST_HEAD(devfreq_list); | |
45 | static DEFINE_MUTEX(devfreq_list_lock); | |
46 | ||
47 | /** | |
48 | * find_device_devfreq() - find devfreq struct using device pointer | |
49 | * @dev: device pointer used to lookup device devfreq. | |
50 | * | |
51 | * Search the list of device devfreqs and return the matched device's | |
52 | * devfreq info. devfreq_list_lock should be held by the caller. | |
53 | */ | |
54 | static struct devfreq *find_device_devfreq(struct device *dev) | |
55 | { | |
56 | struct devfreq *tmp_devfreq; | |
57 | ||
9348da2f | 58 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
59 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
60 | return ERR_PTR(-EINVAL); | |
61 | } | |
62 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
63 | "devfreq_list_lock must be locked."); | |
64 | ||
65 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
66 | if (tmp_devfreq->dev.parent == dev) | |
67 | return tmp_devfreq; | |
68 | } | |
69 | ||
70 | return ERR_PTR(-ENODEV); | |
71 | } | |
72 | ||
ab8f58ad CC |
73 | static unsigned long find_available_min_freq(struct devfreq *devfreq) |
74 | { | |
75 | struct dev_pm_opp *opp; | |
76 | unsigned long min_freq = 0; | |
77 | ||
78 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); | |
79 | if (IS_ERR(opp)) | |
80 | min_freq = 0; | |
81 | else | |
82 | dev_pm_opp_put(opp); | |
83 | ||
84 | return min_freq; | |
85 | } | |
86 | ||
87 | static unsigned long find_available_max_freq(struct devfreq *devfreq) | |
88 | { | |
89 | struct dev_pm_opp *opp; | |
90 | unsigned long max_freq = ULONG_MAX; | |
91 | ||
92 | opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); | |
93 | if (IS_ERR(opp)) | |
94 | max_freq = 0; | |
95 | else | |
96 | dev_pm_opp_put(opp); | |
97 | ||
98 | return max_freq; | |
99 | } | |
100 | ||
e552bbaf JL |
101 | /** |
102 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
103 | * @devfreq: the devfreq instance | |
104 | * @freq: the target frequency | |
105 | */ | |
106 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
107 | { | |
108 | int lev; | |
109 | ||
110 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
111 | if (freq == devfreq->profile->freq_table[lev]) | |
112 | return lev; | |
113 | ||
114 | return -EINVAL; | |
115 | } | |
116 | ||
ea572f81 | 117 | static int set_freq_table(struct devfreq *devfreq) |
0ec09ac2 CC |
118 | { |
119 | struct devfreq_dev_profile *profile = devfreq->profile; | |
120 | struct dev_pm_opp *opp; | |
121 | unsigned long freq; | |
122 | int i, count; | |
123 | ||
124 | /* Initialize the freq_table from OPP table */ | |
125 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
126 | if (count <= 0) | |
ea572f81 | 127 | return -EINVAL; |
0ec09ac2 CC |
128 | |
129 | profile->max_state = count; | |
130 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
131 | profile->max_state, | |
132 | sizeof(*profile->freq_table), | |
133 | GFP_KERNEL); | |
134 | if (!profile->freq_table) { | |
135 | profile->max_state = 0; | |
ea572f81 | 136 | return -ENOMEM; |
0ec09ac2 CC |
137 | } |
138 | ||
0ec09ac2 CC |
139 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { |
140 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
141 | if (IS_ERR(opp)) { | |
142 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
143 | profile->max_state = 0; | |
ea572f81 | 144 | return PTR_ERR(opp); |
0ec09ac2 | 145 | } |
8a31d9d9 | 146 | dev_pm_opp_put(opp); |
0ec09ac2 CC |
147 | profile->freq_table[i] = freq; |
148 | } | |
ea572f81 CC |
149 | |
150 | return 0; | |
0ec09ac2 CC |
151 | } |
152 | ||
e552bbaf JL |
153 | /** |
154 | * devfreq_update_status() - Update statistics of devfreq behavior | |
155 | * @devfreq: the devfreq instance | |
156 | * @freq: the update target frequency | |
157 | */ | |
30582c25 | 158 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 159 | { |
e35d35a1 | 160 | int lev, prev_lev, ret = 0; |
e552bbaf JL |
161 | unsigned long cur_time; |
162 | ||
e552bbaf | 163 | cur_time = jiffies; |
e35d35a1 | 164 | |
d0563a03 TJ |
165 | /* Immediately exit if previous_freq is not initialized yet. */ |
166 | if (!devfreq->previous_freq) | |
167 | goto out; | |
168 | ||
e35d35a1 SK |
169 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
170 | if (prev_lev < 0) { | |
171 | ret = prev_lev; | |
172 | goto out; | |
173 | } | |
174 | ||
175 | devfreq->time_in_state[prev_lev] += | |
e552bbaf | 176 | cur_time - devfreq->last_stat_updated; |
e35d35a1 SK |
177 | |
178 | lev = devfreq_get_freq_level(devfreq, freq); | |
179 | if (lev < 0) { | |
180 | ret = lev; | |
181 | goto out; | |
182 | } | |
183 | ||
184 | if (lev != prev_lev) { | |
e552bbaf JL |
185 | devfreq->trans_table[(prev_lev * |
186 | devfreq->profile->max_state) + lev]++; | |
187 | devfreq->total_trans++; | |
188 | } | |
e552bbaf | 189 | |
e35d35a1 SK |
190 | out: |
191 | devfreq->last_stat_updated = cur_time; | |
192 | return ret; | |
e552bbaf | 193 | } |
30582c25 | 194 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 195 | |
3aa173b8 NM |
196 | /** |
197 | * find_devfreq_governor() - find devfreq governor from name | |
198 | * @name: name of the governor | |
199 | * | |
200 | * Search the list of devfreq governors and return the matched | |
201 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
202 | */ | |
203 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
204 | { | |
205 | struct devfreq_governor *tmp_governor; | |
206 | ||
9348da2f | 207 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
208 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
209 | return ERR_PTR(-EINVAL); | |
210 | } | |
211 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
212 | "devfreq_list_lock must be locked."); | |
213 | ||
214 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
215 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
216 | return tmp_governor; | |
217 | } | |
218 | ||
219 | return ERR_PTR(-ENODEV); | |
220 | } | |
221 | ||
23c7b54c EBS |
222 | /** |
223 | * try_then_request_governor() - Try to find the governor and request the | |
224 | * module if is not found. | |
225 | * @name: name of the governor | |
226 | * | |
227 | * Search the list of devfreq governors and request the module and try again | |
228 | * if is not found. This can happen when both drivers (the governor driver | |
229 | * and the driver that call devfreq_add_device) are built as modules. | |
230 | * devfreq_list_lock should be held by the caller. Returns the matched | |
231 | * governor's pointer. | |
232 | */ | |
233 | static struct devfreq_governor *try_then_request_governor(const char *name) | |
234 | { | |
235 | struct devfreq_governor *governor; | |
236 | int err = 0; | |
237 | ||
238 | if (IS_ERR_OR_NULL(name)) { | |
239 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); | |
240 | return ERR_PTR(-EINVAL); | |
241 | } | |
242 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
243 | "devfreq_list_lock must be locked."); | |
244 | ||
245 | governor = find_devfreq_governor(name); | |
246 | if (IS_ERR(governor)) { | |
247 | mutex_unlock(&devfreq_list_lock); | |
248 | ||
249 | if (!strncmp(name, DEVFREQ_GOV_SIMPLE_ONDEMAND, | |
250 | DEVFREQ_NAME_LEN)) | |
251 | err = request_module("governor_%s", "simpleondemand"); | |
252 | else | |
253 | err = request_module("governor_%s", name); | |
254 | /* Restore previous state before return */ | |
255 | mutex_lock(&devfreq_list_lock); | |
256 | if (err) | |
257 | return NULL; | |
258 | ||
259 | governor = find_devfreq_governor(name); | |
260 | } | |
261 | ||
262 | return governor; | |
263 | } | |
264 | ||
0fe3a664 CC |
265 | static int devfreq_notify_transition(struct devfreq *devfreq, |
266 | struct devfreq_freqs *freqs, unsigned int state) | |
267 | { | |
268 | if (!devfreq) | |
269 | return -EINVAL; | |
270 | ||
271 | switch (state) { | |
272 | case DEVFREQ_PRECHANGE: | |
273 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
274 | DEVFREQ_PRECHANGE, freqs); | |
275 | break; | |
276 | ||
277 | case DEVFREQ_POSTCHANGE: | |
278 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
279 | DEVFREQ_POSTCHANGE, freqs); | |
280 | break; | |
281 | default: | |
282 | return -EINVAL; | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
63314172 LL |
288 | static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, |
289 | u32 flags) | |
290 | { | |
291 | struct devfreq_freqs freqs; | |
292 | unsigned long cur_freq; | |
293 | int err = 0; | |
294 | ||
295 | if (devfreq->profile->get_cur_freq) | |
296 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
297 | else | |
298 | cur_freq = devfreq->previous_freq; | |
299 | ||
300 | freqs.old = cur_freq; | |
301 | freqs.new = new_freq; | |
302 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
303 | ||
304 | err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); | |
305 | if (err) { | |
306 | freqs.new = cur_freq; | |
307 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
308 | return err; | |
309 | } | |
310 | ||
311 | freqs.new = new_freq; | |
312 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
313 | ||
314 | if (devfreq_update_status(devfreq, new_freq)) | |
315 | dev_err(&devfreq->dev, | |
316 | "Couldn't update frequency transition information.\n"); | |
317 | ||
318 | devfreq->previous_freq = new_freq; | |
83f8ca45 LL |
319 | |
320 | if (devfreq->suspend_freq) | |
321 | devfreq->resume_freq = cur_freq; | |
322 | ||
63314172 LL |
323 | return err; |
324 | } | |
325 | ||
7e6fdd4b RV |
326 | /* Load monitoring helper functions for governors use */ |
327 | ||
a3c98b8b MH |
328 | /** |
329 | * update_devfreq() - Reevaluate the device and configure frequency. | |
330 | * @devfreq: the devfreq instance. | |
331 | * | |
332 | * Note: Lock devfreq->lock before calling update_devfreq | |
333 | * This function is exported for governors. | |
334 | */ | |
335 | int update_devfreq(struct devfreq *devfreq) | |
336 | { | |
63314172 | 337 | unsigned long freq, min_freq, max_freq; |
a3c98b8b | 338 | int err = 0; |
ab5f299f | 339 | u32 flags = 0; |
a3c98b8b MH |
340 | |
341 | if (!mutex_is_locked(&devfreq->lock)) { | |
342 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
1b5c1be2 NM |
346 | if (!devfreq->governor) |
347 | return -EINVAL; | |
348 | ||
a3c98b8b MH |
349 | /* Reevaluate the proper frequency */ |
350 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
351 | if (err) | |
352 | return err; | |
353 | ||
ab5f299f | 354 | /* |
f1d981ea | 355 | * Adjust the frequency with user freq, QoS and available freq. |
ab5f299f | 356 | * |
d3b7e174 JM |
357 | * List from the highest priority |
358 | * max_freq | |
ab5f299f MH |
359 | * min_freq |
360 | */ | |
d0e46420 BA |
361 | max_freq = min(devfreq->scaling_max_freq, devfreq->max_freq); |
362 | min_freq = max(devfreq->scaling_min_freq, devfreq->min_freq); | |
ab5f299f | 363 | |
df5cf4a3 | 364 | if (freq < min_freq) { |
f1d981ea | 365 | freq = min_freq; |
ab5f299f MH |
366 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ |
367 | } | |
df5cf4a3 | 368 | if (freq > max_freq) { |
f1d981ea | 369 | freq = max_freq; |
ab5f299f MH |
370 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ |
371 | } | |
372 | ||
63314172 | 373 | return devfreq_set_target(devfreq, freq, flags); |
0fe3a664 | 374 | |
a3c98b8b | 375 | } |
2df5021f | 376 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 377 | |
7e6fdd4b RV |
378 | /** |
379 | * devfreq_monitor() - Periodically poll devfreq objects. | |
380 | * @work: the work struct used to run devfreq_monitor periodically. | |
381 | * | |
382 | */ | |
383 | static void devfreq_monitor(struct work_struct *work) | |
384 | { | |
385 | int err; | |
386 | struct devfreq *devfreq = container_of(work, | |
387 | struct devfreq, work.work); | |
388 | ||
389 | mutex_lock(&devfreq->lock); | |
390 | err = update_devfreq(devfreq); | |
391 | if (err) | |
392 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
393 | ||
394 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
395 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
396 | mutex_unlock(&devfreq->lock); | |
397 | } | |
398 | ||
399 | /** | |
400 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
401 | * @devfreq: the devfreq instance. | |
402 | * | |
403 | * Helper function for starting devfreq device load monitoing. By | |
404 | * default delayed work based monitoring is supported. Function | |
405 | * to be called from governor in response to DEVFREQ_GOV_START | |
406 | * event when device is added to devfreq framework. | |
407 | */ | |
408 | void devfreq_monitor_start(struct devfreq *devfreq) | |
409 | { | |
410 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
411 | if (devfreq->profile->polling_ms) | |
412 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
413 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
414 | } | |
6dcdd8e3 | 415 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
416 | |
417 | /** | |
418 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
419 | * @devfreq: the devfreq instance. | |
420 | * | |
421 | * Helper function to stop devfreq device load monitoing. Function | |
422 | * to be called from governor in response to DEVFREQ_GOV_STOP | |
423 | * event when device is removed from devfreq framework. | |
424 | */ | |
425 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
426 | { | |
427 | cancel_delayed_work_sync(&devfreq->work); | |
428 | } | |
6dcdd8e3 | 429 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
430 | |
431 | /** | |
432 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
433 | * @devfreq: the devfreq instance. | |
434 | * | |
435 | * Helper function to suspend devfreq device load monitoing. Function | |
436 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND | |
437 | * event or when polling interval is set to zero. | |
438 | * | |
439 | * Note: Though this function is same as devfreq_monitor_stop(), | |
440 | * intentionally kept separate to provide hooks for collecting | |
441 | * transition statistics. | |
442 | */ | |
443 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
444 | { | |
445 | mutex_lock(&devfreq->lock); | |
446 | if (devfreq->stop_polling) { | |
447 | mutex_unlock(&devfreq->lock); | |
448 | return; | |
449 | } | |
450 | ||
39688ce6 | 451 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
452 | devfreq->stop_polling = true; |
453 | mutex_unlock(&devfreq->lock); | |
454 | cancel_delayed_work_sync(&devfreq->work); | |
455 | } | |
6dcdd8e3 | 456 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
457 | |
458 | /** | |
459 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
460 | * @devfreq: the devfreq instance. | |
461 | * | |
462 | * Helper function to resume devfreq device load monitoing. Function | |
463 | * to be called from governor in response to DEVFREQ_GOV_RESUME | |
464 | * event or when polling interval is set to non-zero. | |
465 | */ | |
466 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
467 | { | |
39688ce6 RV |
468 | unsigned long freq; |
469 | ||
7e6fdd4b RV |
470 | mutex_lock(&devfreq->lock); |
471 | if (!devfreq->stop_polling) | |
472 | goto out; | |
473 | ||
474 | if (!delayed_work_pending(&devfreq->work) && | |
475 | devfreq->profile->polling_ms) | |
476 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
477 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
478 | |
479 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
480 | devfreq->stop_polling = false; |
481 | ||
39688ce6 RV |
482 | if (devfreq->profile->get_cur_freq && |
483 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
484 | devfreq->previous_freq = freq; | |
485 | ||
7e6fdd4b RV |
486 | out: |
487 | mutex_unlock(&devfreq->lock); | |
488 | } | |
6dcdd8e3 | 489 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
490 | |
491 | /** | |
492 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
493 | * @devfreq: the devfreq instance. | |
494 | * @delay: new polling interval to be set. | |
495 | * | |
496 | * Helper function to set new load monitoring polling interval. Function | |
497 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
498 | */ | |
499 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
500 | { | |
501 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
502 | unsigned int new_delay = *delay; | |
503 | ||
504 | mutex_lock(&devfreq->lock); | |
505 | devfreq->profile->polling_ms = new_delay; | |
506 | ||
507 | if (devfreq->stop_polling) | |
508 | goto out; | |
509 | ||
510 | /* if new delay is zero, stop polling */ | |
511 | if (!new_delay) { | |
512 | mutex_unlock(&devfreq->lock); | |
513 | cancel_delayed_work_sync(&devfreq->work); | |
514 | return; | |
515 | } | |
516 | ||
517 | /* if current delay is zero, start polling with new delay */ | |
518 | if (!cur_delay) { | |
519 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
520 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
521 | goto out; | |
522 | } | |
523 | ||
524 | /* if current delay is greater than new delay, restart polling */ | |
525 | if (cur_delay > new_delay) { | |
526 | mutex_unlock(&devfreq->lock); | |
527 | cancel_delayed_work_sync(&devfreq->work); | |
528 | mutex_lock(&devfreq->lock); | |
529 | if (!devfreq->stop_polling) | |
530 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
531 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
532 | } | |
533 | out: | |
534 | mutex_unlock(&devfreq->lock); | |
535 | } | |
6dcdd8e3 | 536 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
537 | |
538 | /** | |
539 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
540 | * has been changed out of devfreq framework. | |
c5b4a1c1 NM |
541 | * @nb: the notifier_block (supposed to be devfreq->nb) |
542 | * @type: not used | |
543 | * @devp: not used | |
a3c98b8b MH |
544 | * |
545 | * Called by a notifier that uses devfreq->nb. | |
546 | */ | |
547 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
548 | void *devp) | |
549 | { | |
550 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
551 | int ret; | |
552 | ||
553 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
554 | |
555 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
556 | if (!devfreq->scaling_min_freq) { | |
557 | mutex_unlock(&devfreq->lock); | |
558 | return -EINVAL; | |
559 | } | |
560 | ||
561 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
562 | if (!devfreq->scaling_max_freq) { | |
563 | mutex_unlock(&devfreq->lock); | |
564 | return -EINVAL; | |
565 | } | |
566 | ||
a3c98b8b MH |
567 | ret = update_devfreq(devfreq); |
568 | mutex_unlock(&devfreq->lock); | |
569 | ||
570 | return ret; | |
571 | } | |
572 | ||
573 | /** | |
29b6968b CC |
574 | * devfreq_dev_release() - Callback for struct device to release the device. |
575 | * @dev: the devfreq device | |
576 | * | |
577 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 578 | */ |
29b6968b | 579 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 580 | { |
29b6968b CC |
581 | struct devfreq *devfreq = to_devfreq(dev); |
582 | ||
7e6fdd4b RV |
583 | mutex_lock(&devfreq_list_lock); |
584 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
585 | mutex_unlock(&devfreq_list_lock); | |
586 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
587 | return; |
588 | } | |
7e6fdd4b RV |
589 | list_del(&devfreq->node); |
590 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 591 | |
a3c98b8b MH |
592 | if (devfreq->profile->exit) |
593 | devfreq->profile->exit(devfreq->dev.parent); | |
594 | ||
a3c98b8b | 595 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
596 | kfree(devfreq); |
597 | } | |
598 | ||
a3c98b8b MH |
599 | /** |
600 | * devfreq_add_device() - Add devfreq feature to the device | |
601 | * @dev: the device to add devfreq feature. | |
602 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 603 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
604 | * @data: private data for the governor. The devfreq framework does not |
605 | * touch this value. | |
606 | */ | |
607 | struct devfreq *devfreq_add_device(struct device *dev, | |
608 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 609 | const char *governor_name, |
a3c98b8b MH |
610 | void *data) |
611 | { | |
612 | struct devfreq *devfreq; | |
1b5c1be2 | 613 | struct devfreq_governor *governor; |
4585fbcb | 614 | static atomic_t devfreq_no = ATOMIC_INIT(-1); |
a3c98b8b MH |
615 | int err = 0; |
616 | ||
1b5c1be2 | 617 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
618 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
619 | return ERR_PTR(-EINVAL); | |
620 | } | |
621 | ||
7e6fdd4b RV |
622 | mutex_lock(&devfreq_list_lock); |
623 | devfreq = find_device_devfreq(dev); | |
624 | mutex_unlock(&devfreq_list_lock); | |
625 | if (!IS_ERR(devfreq)) { | |
9d0109be CC |
626 | dev_err(dev, "%s: Unable to create devfreq for the device.\n", |
627 | __func__); | |
7e6fdd4b RV |
628 | err = -EINVAL; |
629 | goto err_out; | |
a3c98b8b MH |
630 | } |
631 | ||
632 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
633 | if (!devfreq) { | |
a3c98b8b | 634 | err = -ENOMEM; |
3f19f08a | 635 | goto err_out; |
a3c98b8b MH |
636 | } |
637 | ||
638 | mutex_init(&devfreq->lock); | |
639 | mutex_lock(&devfreq->lock); | |
640 | devfreq->dev.parent = dev; | |
641 | devfreq->dev.class = devfreq_class; | |
642 | devfreq->dev.release = devfreq_dev_release; | |
643 | devfreq->profile = profile; | |
1b5c1be2 | 644 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 645 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 646 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 647 | devfreq->data = data; |
a3c98b8b MH |
648 | devfreq->nb.notifier_call = devfreq_notifier_call; |
649 | ||
0ec09ac2 CC |
650 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
651 | mutex_unlock(&devfreq->lock); | |
ea572f81 CC |
652 | err = set_freq_table(devfreq); |
653 | if (err < 0) | |
654 | goto err_out; | |
0ec09ac2 CC |
655 | mutex_lock(&devfreq->lock); |
656 | } | |
657 | ||
2c2cb1e6 MK |
658 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); |
659 | if (!devfreq->scaling_min_freq) { | |
ab8f58ad CC |
660 | mutex_unlock(&devfreq->lock); |
661 | err = -EINVAL; | |
662 | goto err_dev; | |
663 | } | |
2c2cb1e6 | 664 | devfreq->min_freq = devfreq->scaling_min_freq; |
ab8f58ad | 665 | |
2c2cb1e6 MK |
666 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); |
667 | if (!devfreq->scaling_max_freq) { | |
ab8f58ad CC |
668 | mutex_unlock(&devfreq->lock); |
669 | err = -EINVAL; | |
670 | goto err_dev; | |
671 | } | |
2c2cb1e6 | 672 | devfreq->max_freq = devfreq->scaling_max_freq; |
ab8f58ad | 673 | |
83f8ca45 LL |
674 | devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); |
675 | atomic_set(&devfreq->suspend_count, 0); | |
676 | ||
4585fbcb CC |
677 | dev_set_name(&devfreq->dev, "devfreq%d", |
678 | atomic_inc_return(&devfreq_no)); | |
a3c98b8b MH |
679 | err = device_register(&devfreq->dev); |
680 | if (err) { | |
7e6fdd4b | 681 | mutex_unlock(&devfreq->lock); |
2d803dc8 AY |
682 | put_device(&devfreq->dev); |
683 | goto err_out; | |
a3c98b8b MH |
684 | } |
685 | ||
a86854d0 KC |
686 | devfreq->trans_table = |
687 | devm_kzalloc(&devfreq->dev, | |
688 | array3_size(sizeof(unsigned int), | |
689 | devfreq->profile->max_state, | |
690 | devfreq->profile->max_state), | |
691 | GFP_KERNEL); | |
692 | devfreq->time_in_state = devm_kcalloc(&devfreq->dev, | |
3e1d7fb0 | 693 | devfreq->profile->max_state, |
a86854d0 | 694 | sizeof(unsigned long), |
3e1d7fb0 MH |
695 | GFP_KERNEL); |
696 | devfreq->last_stat_updated = jiffies; | |
697 | ||
0fe3a664 CC |
698 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
699 | ||
a3c98b8b MH |
700 | mutex_unlock(&devfreq->lock); |
701 | ||
a3c98b8b | 702 | mutex_lock(&devfreq_list_lock); |
a3c98b8b | 703 | |
23c7b54c | 704 | governor = try_then_request_governor(devfreq->governor_name); |
73613b16 CC |
705 | if (IS_ERR(governor)) { |
706 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
707 | __func__); | |
708 | err = PTR_ERR(governor); | |
709 | goto err_init; | |
710 | } | |
711 | ||
712 | devfreq->governor = governor; | |
713 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
714 | NULL); | |
7e6fdd4b RV |
715 | if (err) { |
716 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
717 | __func__); | |
718 | goto err_init; | |
a3c98b8b | 719 | } |
23c7b54c EBS |
720 | |
721 | list_add(&devfreq->node, &devfreq_list); | |
722 | ||
0f376c9c | 723 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 724 | |
3f19f08a AL |
725 | return devfreq; |
726 | ||
a3c98b8b | 727 | err_init: |
0f376c9c AL |
728 | mutex_unlock(&devfreq_list_lock); |
729 | ||
2f061fd0 | 730 | devfreq_remove_device(devfreq); |
2d803dc8 | 731 | devfreq = NULL; |
9e14de10 | 732 | err_dev: |
8188b154 | 733 | kfree(devfreq); |
3f19f08a AL |
734 | err_out: |
735 | return ERR_PTR(err); | |
a3c98b8b | 736 | } |
7e6fdd4b | 737 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
738 | |
739 | /** | |
740 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 741 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
742 | * |
743 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
744 | */ |
745 | int devfreq_remove_device(struct devfreq *devfreq) | |
746 | { | |
747 | if (!devfreq) | |
748 | return -EINVAL; | |
749 | ||
2f061fd0 VD |
750 | if (devfreq->governor) |
751 | devfreq->governor->event_handler(devfreq, | |
752 | DEVFREQ_GOV_STOP, NULL); | |
585fc83e | 753 | device_unregister(&devfreq->dev); |
9f3bdd4f | 754 | |
a3c98b8b MH |
755 | return 0; |
756 | } | |
7e6fdd4b | 757 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 758 | |
8cd84092 CC |
759 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
760 | { | |
761 | struct devfreq **r = res; | |
762 | ||
763 | if (WARN_ON(!r || !*r)) | |
764 | return 0; | |
765 | ||
766 | return *r == data; | |
767 | } | |
768 | ||
769 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
770 | { | |
771 | devfreq_remove_device(*(struct devfreq **)res); | |
772 | } | |
773 | ||
774 | /** | |
775 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
776 | * @dev: the device to add devfreq feature. | |
777 | * @profile: device-specific profile to run devfreq. | |
778 | * @governor_name: name of the policy to choose frequency. | |
779 | * @data: private data for the governor. The devfreq framework does not | |
780 | * touch this value. | |
781 | * | |
782 | * This function manages automatically the memory of devfreq device using device | |
783 | * resource management and simplify the free operation for memory of devfreq | |
784 | * device. | |
785 | */ | |
786 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
787 | struct devfreq_dev_profile *profile, | |
788 | const char *governor_name, | |
789 | void *data) | |
790 | { | |
791 | struct devfreq **ptr, *devfreq; | |
792 | ||
793 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
794 | if (!ptr) | |
795 | return ERR_PTR(-ENOMEM); | |
796 | ||
797 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
798 | if (IS_ERR(devfreq)) { | |
799 | devres_free(ptr); | |
d1bf2d30 | 800 | return devfreq; |
8cd84092 CC |
801 | } |
802 | ||
803 | *ptr = devfreq; | |
804 | devres_add(dev, ptr); | |
805 | ||
806 | return devfreq; | |
807 | } | |
808 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
809 | ||
8f510aeb CC |
810 | #ifdef CONFIG_OF |
811 | /* | |
812 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
813 | * @dev - instance to the given device | |
814 | * @index - index into list of devfreq | |
815 | * | |
816 | * return the instance of devfreq device | |
817 | */ | |
818 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
819 | { | |
820 | struct device_node *node; | |
821 | struct devfreq *devfreq; | |
822 | ||
823 | if (!dev) | |
824 | return ERR_PTR(-EINVAL); | |
825 | ||
826 | if (!dev->of_node) | |
827 | return ERR_PTR(-EINVAL); | |
828 | ||
829 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
830 | if (!node) | |
831 | return ERR_PTR(-ENODEV); | |
832 | ||
833 | mutex_lock(&devfreq_list_lock); | |
834 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
835 | if (devfreq->dev.parent | |
836 | && devfreq->dev.parent->of_node == node) { | |
837 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 838 | of_node_put(node); |
8f510aeb CC |
839 | return devfreq; |
840 | } | |
841 | } | |
842 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 843 | of_node_put(node); |
8f510aeb CC |
844 | |
845 | return ERR_PTR(-EPROBE_DEFER); | |
846 | } | |
847 | #else | |
848 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
849 | { | |
850 | return ERR_PTR(-ENODEV); | |
851 | } | |
852 | #endif /* CONFIG_OF */ | |
853 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
854 | ||
8cd84092 CC |
855 | /** |
856 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
857 | * @dev: the device to add devfreq feature. | |
858 | * @devfreq: the devfreq instance to be removed | |
859 | */ | |
860 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
861 | { | |
862 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
863 | devm_devfreq_dev_match, devfreq)); | |
864 | } | |
865 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
866 | ||
206c30cf RV |
867 | /** |
868 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
869 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
870 | * |
871 | * This function is intended to be called by the pm callbacks | |
872 | * (e.g., runtime_suspend, suspend) of the device driver that | |
873 | * holds the devfreq. | |
206c30cf RV |
874 | */ |
875 | int devfreq_suspend_device(struct devfreq *devfreq) | |
876 | { | |
83f8ca45 LL |
877 | int ret; |
878 | ||
a3c98b8b MH |
879 | if (!devfreq) |
880 | return -EINVAL; | |
881 | ||
83f8ca45 | 882 | if (atomic_inc_return(&devfreq->suspend_count) > 1) |
1b5c1be2 NM |
883 | return 0; |
884 | ||
83f8ca45 LL |
885 | if (devfreq->governor) { |
886 | ret = devfreq->governor->event_handler(devfreq, | |
887 | DEVFREQ_GOV_SUSPEND, NULL); | |
888 | if (ret) | |
889 | return ret; | |
890 | } | |
891 | ||
892 | if (devfreq->suspend_freq) { | |
893 | ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); | |
894 | if (ret) | |
895 | return ret; | |
896 | } | |
897 | ||
898 | return 0; | |
206c30cf RV |
899 | } |
900 | EXPORT_SYMBOL(devfreq_suspend_device); | |
901 | ||
902 | /** | |
903 | * devfreq_resume_device() - Resume devfreq of a device. | |
904 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
905 | * |
906 | * This function is intended to be called by the pm callbacks | |
907 | * (e.g., runtime_resume, resume) of the device driver that | |
908 | * holds the devfreq. | |
206c30cf RV |
909 | */ |
910 | int devfreq_resume_device(struct devfreq *devfreq) | |
911 | { | |
83f8ca45 LL |
912 | int ret; |
913 | ||
206c30cf RV |
914 | if (!devfreq) |
915 | return -EINVAL; | |
916 | ||
83f8ca45 | 917 | if (atomic_dec_return(&devfreq->suspend_count) >= 1) |
1b5c1be2 NM |
918 | return 0; |
919 | ||
83f8ca45 LL |
920 | if (devfreq->resume_freq) { |
921 | ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); | |
922 | if (ret) | |
923 | return ret; | |
924 | } | |
925 | ||
926 | if (devfreq->governor) { | |
927 | ret = devfreq->governor->event_handler(devfreq, | |
928 | DEVFREQ_GOV_RESUME, NULL); | |
929 | if (ret) | |
930 | return ret; | |
931 | } | |
932 | ||
933 | return 0; | |
206c30cf RV |
934 | } |
935 | EXPORT_SYMBOL(devfreq_resume_device); | |
936 | ||
59031956 LL |
937 | /** |
938 | * devfreq_suspend() - Suspend devfreq governors and devices | |
939 | * | |
940 | * Called during system wide Suspend/Hibernate cycles for suspending governors | |
941 | * and devices preserving the state for resume. On some platforms the devfreq | |
942 | * device must have precise state (frequency) after resume in order to provide | |
943 | * fully operating setup. | |
944 | */ | |
945 | void devfreq_suspend(void) | |
946 | { | |
947 | struct devfreq *devfreq; | |
948 | int ret; | |
949 | ||
950 | mutex_lock(&devfreq_list_lock); | |
951 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
952 | ret = devfreq_suspend_device(devfreq); | |
953 | if (ret) | |
954 | dev_err(&devfreq->dev, | |
955 | "failed to suspend devfreq device\n"); | |
956 | } | |
957 | mutex_unlock(&devfreq_list_lock); | |
958 | } | |
959 | ||
960 | /** | |
961 | * devfreq_resume() - Resume devfreq governors and devices | |
962 | * | |
963 | * Called during system wide Suspend/Hibernate cycle for resuming governors and | |
964 | * devices that are suspended with devfreq_suspend(). | |
965 | */ | |
966 | void devfreq_resume(void) | |
967 | { | |
968 | struct devfreq *devfreq; | |
969 | int ret; | |
970 | ||
971 | mutex_lock(&devfreq_list_lock); | |
972 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
973 | ret = devfreq_resume_device(devfreq); | |
974 | if (ret) | |
975 | dev_warn(&devfreq->dev, | |
976 | "failed to resume devfreq device\n"); | |
977 | } | |
978 | mutex_unlock(&devfreq_list_lock); | |
979 | } | |
980 | ||
3aa173b8 NM |
981 | /** |
982 | * devfreq_add_governor() - Add devfreq governor | |
983 | * @governor: the devfreq governor to be added | |
984 | */ | |
985 | int devfreq_add_governor(struct devfreq_governor *governor) | |
986 | { | |
987 | struct devfreq_governor *g; | |
1b5c1be2 | 988 | struct devfreq *devfreq; |
3aa173b8 NM |
989 | int err = 0; |
990 | ||
991 | if (!governor) { | |
992 | pr_err("%s: Invalid parameters.\n", __func__); | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
996 | mutex_lock(&devfreq_list_lock); | |
997 | g = find_devfreq_governor(governor->name); | |
998 | if (!IS_ERR(g)) { | |
999 | pr_err("%s: governor %s already registered\n", __func__, | |
1000 | g->name); | |
1001 | err = -EINVAL; | |
1002 | goto err_out; | |
1003 | } | |
9f3bdd4f | 1004 | |
3aa173b8 NM |
1005 | list_add(&governor->node, &devfreq_governor_list); |
1006 | ||
1b5c1be2 NM |
1007 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1008 | int ret = 0; | |
1009 | struct device *dev = devfreq->dev.parent; | |
1010 | ||
1011 | if (!strncmp(devfreq->governor_name, governor->name, | |
1012 | DEVFREQ_NAME_LEN)) { | |
1013 | /* The following should never occur */ | |
1014 | if (devfreq->governor) { | |
1015 | dev_warn(dev, | |
1016 | "%s: Governor %s already present\n", | |
1017 | __func__, devfreq->governor->name); | |
1018 | ret = devfreq->governor->event_handler(devfreq, | |
1019 | DEVFREQ_GOV_STOP, NULL); | |
1020 | if (ret) { | |
1021 | dev_warn(dev, | |
1022 | "%s: Governor %s stop = %d\n", | |
1023 | __func__, | |
1024 | devfreq->governor->name, ret); | |
1025 | } | |
1026 | /* Fall through */ | |
1027 | } | |
1028 | devfreq->governor = governor; | |
1029 | ret = devfreq->governor->event_handler(devfreq, | |
1030 | DEVFREQ_GOV_START, NULL); | |
1031 | if (ret) { | |
1032 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
1033 | __func__, devfreq->governor->name, | |
1034 | ret); | |
1035 | } | |
a3c98b8b MH |
1036 | } |
1037 | } | |
1038 | ||
3aa173b8 NM |
1039 | err_out: |
1040 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 1041 | |
3aa173b8 NM |
1042 | return err; |
1043 | } | |
1044 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 1045 | |
3aa173b8 | 1046 | /** |
bafeb42b | 1047 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
1048 | * @governor: the devfreq governor to be removed |
1049 | */ | |
1050 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
1051 | { | |
1052 | struct devfreq_governor *g; | |
1b5c1be2 | 1053 | struct devfreq *devfreq; |
3aa173b8 NM |
1054 | int err = 0; |
1055 | ||
1056 | if (!governor) { | |
1057 | pr_err("%s: Invalid parameters.\n", __func__); | |
1058 | return -EINVAL; | |
1059 | } | |
1060 | ||
1061 | mutex_lock(&devfreq_list_lock); | |
1062 | g = find_devfreq_governor(governor->name); | |
1063 | if (IS_ERR(g)) { | |
1064 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 1065 | governor->name); |
f9c08e2a | 1066 | err = PTR_ERR(g); |
3aa173b8 NM |
1067 | goto err_out; |
1068 | } | |
1b5c1be2 NM |
1069 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1070 | int ret; | |
1071 | struct device *dev = devfreq->dev.parent; | |
1072 | ||
1073 | if (!strncmp(devfreq->governor_name, governor->name, | |
1074 | DEVFREQ_NAME_LEN)) { | |
1075 | /* we should have a devfreq governor! */ | |
1076 | if (!devfreq->governor) { | |
1077 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
1078 | __func__, governor->name); | |
1079 | continue; | |
1080 | /* Fall through */ | |
1081 | } | |
1082 | ret = devfreq->governor->event_handler(devfreq, | |
1083 | DEVFREQ_GOV_STOP, NULL); | |
1084 | if (ret) { | |
1085 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
1086 | __func__, devfreq->governor->name, | |
1087 | ret); | |
1088 | } | |
1089 | devfreq->governor = NULL; | |
1090 | } | |
1091 | } | |
3aa173b8 NM |
1092 | |
1093 | list_del(&governor->node); | |
1094 | err_out: | |
1095 | mutex_unlock(&devfreq_list_lock); | |
1096 | ||
1097 | return err; | |
a3c98b8b | 1098 | } |
3aa173b8 | 1099 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 1100 | |
a93d6b0a | 1101 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
1102 | struct device_attribute *attr, char *buf) |
1103 | { | |
1b5c1be2 NM |
1104 | if (!to_devfreq(dev)->governor) |
1105 | return -EINVAL; | |
1106 | ||
9005b650 MH |
1107 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
1108 | } | |
1109 | ||
a93d6b0a | 1110 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
1111 | const char *buf, size_t count) |
1112 | { | |
1113 | struct devfreq *df = to_devfreq(dev); | |
1114 | int ret; | |
1115 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
1116 | struct devfreq_governor *governor; | |
1117 | ||
1118 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
1119 | if (ret != 1) | |
1120 | return -EINVAL; | |
1121 | ||
1122 | mutex_lock(&devfreq_list_lock); | |
23c7b54c | 1123 | governor = try_then_request_governor(str_governor); |
0359d1af NM |
1124 | if (IS_ERR(governor)) { |
1125 | ret = PTR_ERR(governor); | |
1126 | goto out; | |
1127 | } | |
14a21e7b TJ |
1128 | if (df->governor == governor) { |
1129 | ret = 0; | |
0359d1af | 1130 | goto out; |
63f1e05f GS |
1131 | } else if ((df->governor && df->governor->immutable) || |
1132 | governor->immutable) { | |
bcf23c79 CC |
1133 | ret = -EINVAL; |
1134 | goto out; | |
14a21e7b | 1135 | } |
0359d1af NM |
1136 | |
1137 | if (df->governor) { | |
1138 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1139 | if (ret) { | |
1140 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1141 | __func__, df->governor->name, ret); | |
1142 | goto out; | |
1143 | } | |
1144 | } | |
1145 | df->governor = governor; | |
1146 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
1147 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1148 | if (ret) | |
1149 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
1150 | __func__, df->governor->name, ret); | |
1151 | out: | |
1152 | mutex_unlock(&devfreq_list_lock); | |
1153 | ||
1154 | if (!ret) | |
1155 | ret = count; | |
1156 | return ret; | |
1157 | } | |
a93d6b0a GKH |
1158 | static DEVICE_ATTR_RW(governor); |
1159 | ||
1160 | static ssize_t available_governors_show(struct device *d, | |
1161 | struct device_attribute *attr, | |
1162 | char *buf) | |
50a5b33e | 1163 | { |
bcf23c79 | 1164 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1165 | ssize_t count = 0; |
1166 | ||
1167 | mutex_lock(&devfreq_list_lock); | |
bcf23c79 CC |
1168 | |
1169 | /* | |
1170 | * The devfreq with immutable governor (e.g., passive) shows | |
1171 | * only own governor. | |
1172 | */ | |
1173 | if (df->governor->immutable) { | |
1174 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, | |
1175 | "%s ", df->governor_name); | |
1176 | /* | |
1177 | * The devfreq device shows the registered governor except for | |
1178 | * immutable governors such as passive governor . | |
1179 | */ | |
1180 | } else { | |
1181 | struct devfreq_governor *governor; | |
1182 | ||
1183 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
1184 | if (governor->immutable) | |
1185 | continue; | |
1186 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1187 | "%s ", governor->name); | |
1188 | } | |
1189 | } | |
1190 | ||
50a5b33e NM |
1191 | mutex_unlock(&devfreq_list_lock); |
1192 | ||
1193 | /* Truncate the trailing space */ | |
1194 | if (count) | |
1195 | count--; | |
1196 | ||
1197 | count += sprintf(&buf[count], "\n"); | |
1198 | ||
1199 | return count; | |
1200 | } | |
a93d6b0a | 1201 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1202 | |
a93d6b0a GKH |
1203 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1204 | char *buf) | |
7f98a905 RV |
1205 | { |
1206 | unsigned long freq; | |
1207 | struct devfreq *devfreq = to_devfreq(dev); | |
1208 | ||
1209 | if (devfreq->profile->get_cur_freq && | |
1210 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
9d0109be | 1211 | return sprintf(buf, "%lu\n", freq); |
7f98a905 RV |
1212 | |
1213 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1214 | } | |
a93d6b0a | 1215 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1216 | |
a93d6b0a GKH |
1217 | static ssize_t target_freq_show(struct device *dev, |
1218 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1219 | { |
1220 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1221 | } | |
a93d6b0a | 1222 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1223 | |
a93d6b0a | 1224 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1225 | struct device_attribute *attr, char *buf) |
1226 | { | |
1227 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1228 | } | |
1229 | ||
a93d6b0a | 1230 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1231 | struct device_attribute *attr, |
1232 | const char *buf, size_t count) | |
1233 | { | |
1234 | struct devfreq *df = to_devfreq(dev); | |
1235 | unsigned int value; | |
1236 | int ret; | |
1237 | ||
1b5c1be2 NM |
1238 | if (!df->governor) |
1239 | return -EINVAL; | |
1240 | ||
9005b650 MH |
1241 | ret = sscanf(buf, "%u", &value); |
1242 | if (ret != 1) | |
12e26265 | 1243 | return -EINVAL; |
9005b650 | 1244 | |
7e6fdd4b | 1245 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
1246 | ret = count; |
1247 | ||
9005b650 MH |
1248 | return ret; |
1249 | } | |
a93d6b0a | 1250 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1251 | |
a93d6b0a | 1252 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1253 | const char *buf, size_t count) |
1254 | { | |
1255 | struct devfreq *df = to_devfreq(dev); | |
1256 | unsigned long value; | |
1257 | int ret; | |
6530b9de MH |
1258 | |
1259 | ret = sscanf(buf, "%lu", &value); | |
1260 | if (ret != 1) | |
12e26265 | 1261 | return -EINVAL; |
6530b9de MH |
1262 | |
1263 | mutex_lock(&df->lock); | |
df5cf4a3 MK |
1264 | |
1265 | if (value) { | |
1266 | if (value > df->max_freq) { | |
1267 | ret = -EINVAL; | |
1268 | goto unlock; | |
1269 | } | |
1270 | } else { | |
1271 | unsigned long *freq_table = df->profile->freq_table; | |
1272 | ||
1273 | /* Get minimum frequency according to sorting order */ | |
1274 | if (freq_table[0] < freq_table[df->profile->max_state - 1]) | |
1275 | value = freq_table[0]; | |
1276 | else | |
1277 | value = freq_table[df->profile->max_state - 1]; | |
6530b9de MH |
1278 | } |
1279 | ||
1280 | df->min_freq = value; | |
1281 | update_devfreq(df); | |
1282 | ret = count; | |
1283 | unlock: | |
1284 | mutex_unlock(&df->lock); | |
6530b9de MH |
1285 | return ret; |
1286 | } | |
1287 | ||
1051e2c3 CC |
1288 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1289 | char *buf) | |
1290 | { | |
f1d981ea CC |
1291 | struct devfreq *df = to_devfreq(dev); |
1292 | ||
d0e46420 | 1293 | return sprintf(buf, "%lu\n", max(df->scaling_min_freq, df->min_freq)); |
1051e2c3 CC |
1294 | } |
1295 | ||
a93d6b0a | 1296 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1297 | const char *buf, size_t count) |
1298 | { | |
1299 | struct devfreq *df = to_devfreq(dev); | |
1300 | unsigned long value; | |
1301 | int ret; | |
6530b9de MH |
1302 | |
1303 | ret = sscanf(buf, "%lu", &value); | |
1304 | if (ret != 1) | |
12e26265 | 1305 | return -EINVAL; |
6530b9de MH |
1306 | |
1307 | mutex_lock(&df->lock); | |
df5cf4a3 MK |
1308 | |
1309 | if (value) { | |
1310 | if (value < df->min_freq) { | |
1311 | ret = -EINVAL; | |
1312 | goto unlock; | |
1313 | } | |
1314 | } else { | |
1315 | unsigned long *freq_table = df->profile->freq_table; | |
1316 | ||
1317 | /* Get maximum frequency according to sorting order */ | |
1318 | if (freq_table[0] < freq_table[df->profile->max_state - 1]) | |
1319 | value = freq_table[df->profile->max_state - 1]; | |
1320 | else | |
1321 | value = freq_table[0]; | |
6530b9de MH |
1322 | } |
1323 | ||
1324 | df->max_freq = value; | |
1325 | update_devfreq(df); | |
1326 | ret = count; | |
1327 | unlock: | |
1328 | mutex_unlock(&df->lock); | |
6530b9de MH |
1329 | return ret; |
1330 | } | |
1051e2c3 | 1331 | static DEVICE_ATTR_RW(min_freq); |
6530b9de | 1332 | |
1051e2c3 CC |
1333 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1334 | char *buf) | |
1335 | { | |
f1d981ea CC |
1336 | struct devfreq *df = to_devfreq(dev); |
1337 | ||
d0e46420 | 1338 | return sprintf(buf, "%lu\n", min(df->scaling_max_freq, df->max_freq)); |
6530b9de | 1339 | } |
a93d6b0a | 1340 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1341 | |
a93d6b0a GKH |
1342 | static ssize_t available_frequencies_show(struct device *d, |
1343 | struct device_attribute *attr, | |
1344 | char *buf) | |
d287de85 NM |
1345 | { |
1346 | struct devfreq *df = to_devfreq(d); | |
d287de85 | 1347 | ssize_t count = 0; |
416b46a2 | 1348 | int i; |
d287de85 | 1349 | |
416b46a2 | 1350 | mutex_lock(&df->lock); |
d287de85 | 1351 | |
416b46a2 | 1352 | for (i = 0; i < df->profile->max_state; i++) |
d287de85 | 1353 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
416b46a2 | 1354 | "%lu ", df->profile->freq_table[i]); |
d287de85 | 1355 | |
416b46a2 | 1356 | mutex_unlock(&df->lock); |
d287de85 NM |
1357 | /* Truncate the trailing space */ |
1358 | if (count) | |
1359 | count--; | |
1360 | ||
1361 | count += sprintf(&buf[count], "\n"); | |
1362 | ||
1363 | return count; | |
1364 | } | |
a93d6b0a | 1365 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1366 | |
a93d6b0a GKH |
1367 | static ssize_t trans_stat_show(struct device *dev, |
1368 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1369 | { |
1370 | struct devfreq *devfreq = to_devfreq(dev); | |
1371 | ssize_t len; | |
39688ce6 | 1372 | int i, j; |
e552bbaf JL |
1373 | unsigned int max_state = devfreq->profile->max_state; |
1374 | ||
39688ce6 RV |
1375 | if (!devfreq->stop_polling && |
1376 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1377 | return 0; |
34bd3220 MH |
1378 | if (max_state == 0) |
1379 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1380 | |
d7df1e46 CC |
1381 | len = sprintf(buf, " From : To\n"); |
1382 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1383 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1384 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1385 | devfreq->profile->freq_table[i]); |
1386 | ||
1387 | len += sprintf(buf + len, " time(ms)\n"); | |
1388 | ||
1389 | for (i = 0; i < max_state; i++) { | |
1390 | if (devfreq->profile->freq_table[i] | |
1391 | == devfreq->previous_freq) { | |
1392 | len += sprintf(buf + len, "*"); | |
1393 | } else { | |
1394 | len += sprintf(buf + len, " "); | |
1395 | } | |
d7df1e46 | 1396 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1397 | devfreq->profile->freq_table[i]); |
1398 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1399 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1400 | devfreq->trans_table[(i * max_state) + j]); |
1401 | len += sprintf(buf + len, "%10u\n", | |
1402 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1403 | } | |
1404 | ||
1405 | len += sprintf(buf + len, "Total transition : %u\n", | |
1406 | devfreq->total_trans); | |
1407 | return len; | |
1408 | } | |
a93d6b0a GKH |
1409 | static DEVICE_ATTR_RO(trans_stat); |
1410 | ||
1411 | static struct attribute *devfreq_attrs[] = { | |
1412 | &dev_attr_governor.attr, | |
1413 | &dev_attr_available_governors.attr, | |
1414 | &dev_attr_cur_freq.attr, | |
1415 | &dev_attr_available_frequencies.attr, | |
1416 | &dev_attr_target_freq.attr, | |
1417 | &dev_attr_polling_interval.attr, | |
1418 | &dev_attr_min_freq.attr, | |
1419 | &dev_attr_max_freq.attr, | |
1420 | &dev_attr_trans_stat.attr, | |
1421 | NULL, | |
9005b650 | 1422 | }; |
a93d6b0a | 1423 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1424 | |
a3c98b8b MH |
1425 | static int __init devfreq_init(void) |
1426 | { | |
1427 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1428 | if (IS_ERR(devfreq_class)) { | |
1429 | pr_err("%s: couldn't create class\n", __FILE__); | |
1430 | return PTR_ERR(devfreq_class); | |
1431 | } | |
7e6fdd4b RV |
1432 | |
1433 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1434 | if (!devfreq_wq) { |
7e6fdd4b RV |
1435 | class_destroy(devfreq_class); |
1436 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1437 | return -ENOMEM; |
7e6fdd4b | 1438 | } |
a93d6b0a | 1439 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1440 | |
a3c98b8b MH |
1441 | return 0; |
1442 | } | |
1443 | subsys_initcall(devfreq_init); | |
1444 | ||
a3c98b8b | 1445 | /* |
4091fb95 | 1446 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1447 | * OPP framework. |
1448 | */ | |
1449 | ||
1450 | /** | |
1451 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1452 | * freq value given to target callback. | |
c5b4a1c1 NM |
1453 | * @dev: The devfreq user device. (parent of devfreq) |
1454 | * @freq: The frequency given to target function | |
1455 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1456 | * |
8a31d9d9 VK |
1457 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1458 | * use. | |
a3c98b8b | 1459 | */ |
47d43ba7 NM |
1460 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1461 | unsigned long *freq, | |
1462 | u32 flags) | |
a3c98b8b | 1463 | { |
47d43ba7 | 1464 | struct dev_pm_opp *opp; |
a3c98b8b | 1465 | |
ab5f299f MH |
1466 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1467 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1468 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1469 | |
1470 | /* If not available, use the closest opp */ | |
0779726c | 1471 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1472 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1473 | } else { |
1474 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1475 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1476 | |
1477 | /* If not available, use the closest opp */ | |
0779726c | 1478 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1479 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1480 | } |
1481 | ||
a3c98b8b MH |
1482 | return opp; |
1483 | } | |
bd7e9277 | 1484 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1485 | |
1486 | /** | |
1487 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
1488 | * for any changes in the OPP availability | |
1489 | * changes | |
c5b4a1c1 NM |
1490 | * @dev: The devfreq user device. (parent of devfreq) |
1491 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1492 | */ |
1493 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1494 | { | |
dc2c9ad5 | 1495 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 1496 | } |
bd7e9277 | 1497 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1498 | |
1499 | /** | |
1500 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
1501 | * notified for any changes in the OPP | |
1502 | * availability changes anymore. | |
c5b4a1c1 NM |
1503 | * @dev: The devfreq user device. (parent of devfreq) |
1504 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1505 | * |
1506 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1507 | * devfreq_recommended_opp is used. | |
1508 | */ | |
1509 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1510 | { | |
dc2c9ad5 | 1511 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 1512 | } |
bd7e9277 | 1513 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1514 | |
d5b040d0 CC |
1515 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1516 | { | |
1517 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1518 | } | |
1519 | ||
1520 | /** | |
1521 | * devm_ devfreq_register_opp_notifier() | |
1522 | * - Resource-managed devfreq_register_opp_notifier() | |
1523 | * @dev: The devfreq user device. (parent of devfreq) | |
1524 | * @devfreq: The devfreq object. | |
1525 | */ | |
1526 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1527 | struct devfreq *devfreq) | |
1528 | { | |
1529 | struct devfreq **ptr; | |
1530 | int ret; | |
1531 | ||
1532 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1533 | if (!ptr) | |
1534 | return -ENOMEM; | |
1535 | ||
1536 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1537 | if (ret) { | |
1538 | devres_free(ptr); | |
1539 | return ret; | |
1540 | } | |
1541 | ||
1542 | *ptr = devfreq; | |
1543 | devres_add(dev, ptr); | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1548 | ||
1549 | /** | |
1550 | * devm_devfreq_unregister_opp_notifier() | |
1551 | * - Resource-managed devfreq_unregister_opp_notifier() | |
1552 | * @dev: The devfreq user device. (parent of devfreq) | |
1553 | * @devfreq: The devfreq object. | |
1554 | */ | |
1555 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1556 | struct devfreq *devfreq) | |
1557 | { | |
1558 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1559 | devm_devfreq_dev_match, devfreq)); | |
1560 | } | |
1561 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1562 | ||
0fe3a664 CC |
1563 | /** |
1564 | * devfreq_register_notifier() - Register a driver with devfreq | |
1565 | * @devfreq: The devfreq object. | |
1566 | * @nb: The notifier block to register. | |
1567 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1568 | */ | |
1569 | int devfreq_register_notifier(struct devfreq *devfreq, | |
1570 | struct notifier_block *nb, | |
1571 | unsigned int list) | |
1572 | { | |
1573 | int ret = 0; | |
1574 | ||
1575 | if (!devfreq) | |
1576 | return -EINVAL; | |
1577 | ||
1578 | switch (list) { | |
1579 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1580 | ret = srcu_notifier_chain_register( | |
1581 | &devfreq->transition_notifier_list, nb); | |
1582 | break; | |
1583 | default: | |
1584 | ret = -EINVAL; | |
1585 | } | |
1586 | ||
1587 | return ret; | |
1588 | } | |
1589 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1590 | ||
1591 | /* | |
1592 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1593 | * @devfreq: The devfreq object. | |
1594 | * @nb: The notifier block to be unregistered. | |
1595 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1596 | */ | |
1597 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1598 | struct notifier_block *nb, | |
1599 | unsigned int list) | |
1600 | { | |
1601 | int ret = 0; | |
1602 | ||
1603 | if (!devfreq) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | switch (list) { | |
1607 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1608 | ret = srcu_notifier_chain_unregister( | |
1609 | &devfreq->transition_notifier_list, nb); | |
1610 | break; | |
1611 | default: | |
1612 | ret = -EINVAL; | |
1613 | } | |
1614 | ||
1615 | return ret; | |
1616 | } | |
1617 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1618 | ||
1619 | struct devfreq_notifier_devres { | |
1620 | struct devfreq *devfreq; | |
1621 | struct notifier_block *nb; | |
1622 | unsigned int list; | |
1623 | }; | |
1624 | ||
1625 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1626 | { | |
1627 | struct devfreq_notifier_devres *this = res; | |
1628 | ||
1629 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1630 | } | |
1631 | ||
1632 | /** | |
1633 | * devm_devfreq_register_notifier() | |
1634 | - Resource-managed devfreq_register_notifier() | |
1635 | * @dev: The devfreq user device. (parent of devfreq) | |
1636 | * @devfreq: The devfreq object. | |
1637 | * @nb: The notifier block to be unregistered. | |
1638 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1639 | */ | |
1640 | int devm_devfreq_register_notifier(struct device *dev, | |
1641 | struct devfreq *devfreq, | |
1642 | struct notifier_block *nb, | |
1643 | unsigned int list) | |
1644 | { | |
1645 | struct devfreq_notifier_devres *ptr; | |
1646 | int ret; | |
1647 | ||
1648 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1649 | GFP_KERNEL); | |
1650 | if (!ptr) | |
1651 | return -ENOMEM; | |
1652 | ||
1653 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1654 | if (ret) { | |
1655 | devres_free(ptr); | |
1656 | return ret; | |
1657 | } | |
1658 | ||
1659 | ptr->devfreq = devfreq; | |
1660 | ptr->nb = nb; | |
1661 | ptr->list = list; | |
1662 | devres_add(dev, ptr); | |
1663 | ||
1664 | return 0; | |
1665 | } | |
1666 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1667 | ||
1668 | /** | |
1669 | * devm_devfreq_unregister_notifier() | |
1670 | - Resource-managed devfreq_unregister_notifier() | |
1671 | * @dev: The devfreq user device. (parent of devfreq) | |
1672 | * @devfreq: The devfreq object. | |
1673 | * @nb: The notifier block to be unregistered. | |
1674 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1675 | */ | |
1676 | void devm_devfreq_unregister_notifier(struct device *dev, | |
1677 | struct devfreq *devfreq, | |
1678 | struct notifier_block *nb, | |
1679 | unsigned int list) | |
1680 | { | |
1681 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1682 | devm_devfreq_dev_match, devfreq)); | |
1683 | } | |
1684 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |