]>
Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a3c98b8b MH |
2 | /* |
3 | * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework | |
4 | * for Non-CPU Devices. | |
5 | * | |
6 | * Copyright (C) 2011 Samsung Electronics | |
7 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
a3c98b8b MH |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
23c7b54c | 11 | #include <linux/kmod.h> |
a3c98b8b MH |
12 | #include <linux/sched.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
417dc4bb | 16 | #include <linux/export.h> |
a3c98b8b | 17 | #include <linux/slab.h> |
952f6d13 | 18 | #include <linux/stat.h> |
e4db1c74 | 19 | #include <linux/pm_opp.h> |
a3c98b8b MH |
20 | #include <linux/devfreq.h> |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/printk.h> | |
25 | #include <linux/hrtimer.h> | |
8f510aeb | 26 | #include <linux/of.h> |
a3c98b8b MH |
27 | #include "governor.h" |
28 | ||
cf451adf LL |
29 | #define CREATE_TRACE_POINTS |
30 | #include <trace/events/devfreq.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 | |
b53b0128 | 231 | * governor's pointer or an error pointer. |
23c7b54c EBS |
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) | |
7544fd7f | 257 | return (err < 0) ? ERR_PTR(err) : ERR_PTR(-EINVAL); |
23c7b54c EBS |
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); | |
cf451adf LL |
397 | |
398 | trace_devfreq_monitor(devfreq); | |
7e6fdd4b RV |
399 | } |
400 | ||
401 | /** | |
402 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
403 | * @devfreq: the devfreq instance. | |
404 | * | |
2c090832 | 405 | * Helper function for starting devfreq device load monitoring. By |
7e6fdd4b RV |
406 | * default delayed work based monitoring is supported. Function |
407 | * to be called from governor in response to DEVFREQ_GOV_START | |
408 | * event when device is added to devfreq framework. | |
409 | */ | |
410 | void devfreq_monitor_start(struct devfreq *devfreq) | |
411 | { | |
412 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
413 | if (devfreq->profile->polling_ms) | |
414 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
415 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
416 | } | |
6dcdd8e3 | 417 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
418 | |
419 | /** | |
420 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
421 | * @devfreq: the devfreq instance. | |
422 | * | |
2c090832 | 423 | * Helper function to stop devfreq device load monitoring. Function |
7e6fdd4b RV |
424 | * to be called from governor in response to DEVFREQ_GOV_STOP |
425 | * event when device is removed from devfreq framework. | |
426 | */ | |
427 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
428 | { | |
429 | cancel_delayed_work_sync(&devfreq->work); | |
430 | } | |
6dcdd8e3 | 431 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
432 | |
433 | /** | |
434 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
435 | * @devfreq: the devfreq instance. | |
436 | * | |
2c090832 | 437 | * Helper function to suspend devfreq device load monitoring. Function |
7e6fdd4b RV |
438 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND |
439 | * event or when polling interval is set to zero. | |
440 | * | |
441 | * Note: Though this function is same as devfreq_monitor_stop(), | |
442 | * intentionally kept separate to provide hooks for collecting | |
443 | * transition statistics. | |
444 | */ | |
445 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
446 | { | |
447 | mutex_lock(&devfreq->lock); | |
448 | if (devfreq->stop_polling) { | |
449 | mutex_unlock(&devfreq->lock); | |
450 | return; | |
451 | } | |
452 | ||
39688ce6 | 453 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
454 | devfreq->stop_polling = true; |
455 | mutex_unlock(&devfreq->lock); | |
456 | cancel_delayed_work_sync(&devfreq->work); | |
457 | } | |
6dcdd8e3 | 458 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
459 | |
460 | /** | |
461 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
462 | * @devfreq: the devfreq instance. | |
463 | * | |
2c090832 | 464 | * Helper function to resume devfreq device load monitoring. Function |
7e6fdd4b RV |
465 | * to be called from governor in response to DEVFREQ_GOV_RESUME |
466 | * event or when polling interval is set to non-zero. | |
467 | */ | |
468 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
469 | { | |
39688ce6 RV |
470 | unsigned long freq; |
471 | ||
7e6fdd4b RV |
472 | mutex_lock(&devfreq->lock); |
473 | if (!devfreq->stop_polling) | |
474 | goto out; | |
475 | ||
476 | if (!delayed_work_pending(&devfreq->work) && | |
477 | devfreq->profile->polling_ms) | |
478 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
479 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
480 | |
481 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
482 | devfreq->stop_polling = false; |
483 | ||
39688ce6 RV |
484 | if (devfreq->profile->get_cur_freq && |
485 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
486 | devfreq->previous_freq = freq; | |
487 | ||
7e6fdd4b RV |
488 | out: |
489 | mutex_unlock(&devfreq->lock); | |
490 | } | |
6dcdd8e3 | 491 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
492 | |
493 | /** | |
494 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
495 | * @devfreq: the devfreq instance. | |
496 | * @delay: new polling interval to be set. | |
497 | * | |
498 | * Helper function to set new load monitoring polling interval. Function | |
499 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
500 | */ | |
501 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
502 | { | |
503 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
504 | unsigned int new_delay = *delay; | |
505 | ||
506 | mutex_lock(&devfreq->lock); | |
507 | devfreq->profile->polling_ms = new_delay; | |
508 | ||
509 | if (devfreq->stop_polling) | |
510 | goto out; | |
511 | ||
512 | /* if new delay is zero, stop polling */ | |
513 | if (!new_delay) { | |
514 | mutex_unlock(&devfreq->lock); | |
515 | cancel_delayed_work_sync(&devfreq->work); | |
516 | return; | |
517 | } | |
518 | ||
519 | /* if current delay is zero, start polling with new delay */ | |
520 | if (!cur_delay) { | |
521 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
522 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
523 | goto out; | |
524 | } | |
525 | ||
526 | /* if current delay is greater than new delay, restart polling */ | |
527 | if (cur_delay > new_delay) { | |
528 | mutex_unlock(&devfreq->lock); | |
529 | cancel_delayed_work_sync(&devfreq->work); | |
530 | mutex_lock(&devfreq->lock); | |
531 | if (!devfreq->stop_polling) | |
532 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
6d690f77 | 533 | msecs_to_jiffies(devfreq->profile->polling_ms)); |
7e6fdd4b RV |
534 | } |
535 | out: | |
536 | mutex_unlock(&devfreq->lock); | |
537 | } | |
6dcdd8e3 | 538 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
539 | |
540 | /** | |
541 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
6d690f77 | 542 | * has been changed out of devfreq framework. |
c5b4a1c1 NM |
543 | * @nb: the notifier_block (supposed to be devfreq->nb) |
544 | * @type: not used | |
545 | * @devp: not used | |
a3c98b8b MH |
546 | * |
547 | * Called by a notifier that uses devfreq->nb. | |
548 | */ | |
549 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
550 | void *devp) | |
551 | { | |
552 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
553 | int ret; | |
554 | ||
555 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
556 | |
557 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
558 | if (!devfreq->scaling_min_freq) { | |
559 | mutex_unlock(&devfreq->lock); | |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
564 | if (!devfreq->scaling_max_freq) { | |
565 | mutex_unlock(&devfreq->lock); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
a3c98b8b MH |
569 | ret = update_devfreq(devfreq); |
570 | mutex_unlock(&devfreq->lock); | |
571 | ||
572 | return ret; | |
573 | } | |
574 | ||
575 | /** | |
29b6968b CC |
576 | * devfreq_dev_release() - Callback for struct device to release the device. |
577 | * @dev: the devfreq device | |
578 | * | |
579 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 580 | */ |
29b6968b | 581 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 582 | { |
29b6968b CC |
583 | struct devfreq *devfreq = to_devfreq(dev); |
584 | ||
7e6fdd4b RV |
585 | mutex_lock(&devfreq_list_lock); |
586 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
587 | mutex_unlock(&devfreq_list_lock); | |
588 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
589 | return; |
590 | } | |
7e6fdd4b RV |
591 | list_del(&devfreq->node); |
592 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 593 | |
a3c98b8b MH |
594 | if (devfreq->profile->exit) |
595 | devfreq->profile->exit(devfreq->dev.parent); | |
596 | ||
a3c98b8b | 597 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
598 | kfree(devfreq); |
599 | } | |
600 | ||
a3c98b8b MH |
601 | /** |
602 | * devfreq_add_device() - Add devfreq feature to the device | |
603 | * @dev: the device to add devfreq feature. | |
604 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 605 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
606 | * @data: private data for the governor. The devfreq framework does not |
607 | * touch this value. | |
608 | */ | |
609 | struct devfreq *devfreq_add_device(struct device *dev, | |
610 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 611 | const char *governor_name, |
a3c98b8b MH |
612 | void *data) |
613 | { | |
614 | struct devfreq *devfreq; | |
1b5c1be2 | 615 | struct devfreq_governor *governor; |
4585fbcb | 616 | static atomic_t devfreq_no = ATOMIC_INIT(-1); |
a3c98b8b MH |
617 | int err = 0; |
618 | ||
1b5c1be2 | 619 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
620 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
621 | return ERR_PTR(-EINVAL); | |
622 | } | |
623 | ||
7e6fdd4b RV |
624 | mutex_lock(&devfreq_list_lock); |
625 | devfreq = find_device_devfreq(dev); | |
626 | mutex_unlock(&devfreq_list_lock); | |
627 | if (!IS_ERR(devfreq)) { | |
df4d7b14 | 628 | dev_err(dev, "%s: devfreq device already exists!\n", |
9d0109be | 629 | __func__); |
7e6fdd4b RV |
630 | err = -EINVAL; |
631 | goto err_out; | |
a3c98b8b MH |
632 | } |
633 | ||
634 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
635 | if (!devfreq) { | |
a3c98b8b | 636 | err = -ENOMEM; |
3f19f08a | 637 | goto err_out; |
a3c98b8b MH |
638 | } |
639 | ||
640 | mutex_init(&devfreq->lock); | |
641 | mutex_lock(&devfreq->lock); | |
642 | devfreq->dev.parent = dev; | |
643 | devfreq->dev.class = devfreq_class; | |
644 | devfreq->dev.release = devfreq_dev_release; | |
645 | devfreq->profile = profile; | |
1b5c1be2 | 646 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 647 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 648 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 649 | devfreq->data = data; |
a3c98b8b MH |
650 | devfreq->nb.notifier_call = devfreq_notifier_call; |
651 | ||
0ec09ac2 CC |
652 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
653 | mutex_unlock(&devfreq->lock); | |
ea572f81 CC |
654 | err = set_freq_table(devfreq); |
655 | if (err < 0) | |
a9487917 | 656 | goto err_dev; |
0ec09ac2 CC |
657 | mutex_lock(&devfreq->lock); |
658 | } | |
659 | ||
2c2cb1e6 MK |
660 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); |
661 | if (!devfreq->scaling_min_freq) { | |
ab8f58ad CC |
662 | mutex_unlock(&devfreq->lock); |
663 | err = -EINVAL; | |
664 | goto err_dev; | |
665 | } | |
2c2cb1e6 | 666 | devfreq->min_freq = devfreq->scaling_min_freq; |
ab8f58ad | 667 | |
2c2cb1e6 MK |
668 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); |
669 | if (!devfreq->scaling_max_freq) { | |
ab8f58ad CC |
670 | mutex_unlock(&devfreq->lock); |
671 | err = -EINVAL; | |
672 | goto err_dev; | |
673 | } | |
2c2cb1e6 | 674 | devfreq->max_freq = devfreq->scaling_max_freq; |
ab8f58ad | 675 | |
83f8ca45 LL |
676 | devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); |
677 | atomic_set(&devfreq->suspend_count, 0); | |
678 | ||
4585fbcb CC |
679 | dev_set_name(&devfreq->dev, "devfreq%d", |
680 | atomic_inc_return(&devfreq_no)); | |
a3c98b8b MH |
681 | err = device_register(&devfreq->dev); |
682 | if (err) { | |
7e6fdd4b | 683 | mutex_unlock(&devfreq->lock); |
2d803dc8 AY |
684 | put_device(&devfreq->dev); |
685 | goto err_out; | |
a3c98b8b MH |
686 | } |
687 | ||
6d690f77 MH |
688 | devfreq->trans_table = devm_kzalloc(&devfreq->dev, |
689 | array3_size(sizeof(unsigned int), | |
690 | devfreq->profile->max_state, | |
691 | devfreq->profile->max_state), | |
692 | GFP_KERNEL); | |
25846fa1 YL |
693 | if (!devfreq->trans_table) { |
694 | mutex_unlock(&devfreq->lock); | |
695 | err = -ENOMEM; | |
696 | goto err_devfreq; | |
697 | } | |
698 | ||
a86854d0 | 699 | devfreq->time_in_state = devm_kcalloc(&devfreq->dev, |
6d690f77 MH |
700 | devfreq->profile->max_state, |
701 | sizeof(unsigned long), | |
702 | GFP_KERNEL); | |
25846fa1 YL |
703 | if (!devfreq->time_in_state) { |
704 | mutex_unlock(&devfreq->lock); | |
705 | err = -ENOMEM; | |
706 | goto err_devfreq; | |
707 | } | |
708 | ||
3e1d7fb0 MH |
709 | devfreq->last_stat_updated = jiffies; |
710 | ||
0fe3a664 CC |
711 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
712 | ||
a3c98b8b MH |
713 | mutex_unlock(&devfreq->lock); |
714 | ||
a3c98b8b | 715 | mutex_lock(&devfreq_list_lock); |
a3c98b8b | 716 | |
23c7b54c | 717 | governor = try_then_request_governor(devfreq->governor_name); |
73613b16 CC |
718 | if (IS_ERR(governor)) { |
719 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
720 | __func__); | |
721 | err = PTR_ERR(governor); | |
722 | goto err_init; | |
723 | } | |
724 | ||
725 | devfreq->governor = governor; | |
726 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
727 | NULL); | |
7e6fdd4b RV |
728 | if (err) { |
729 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
730 | __func__); | |
731 | goto err_init; | |
a3c98b8b | 732 | } |
23c7b54c EBS |
733 | |
734 | list_add(&devfreq->node, &devfreq_list); | |
735 | ||
0f376c9c | 736 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 737 | |
3f19f08a AL |
738 | return devfreq; |
739 | ||
a3c98b8b | 740 | err_init: |
0f376c9c | 741 | mutex_unlock(&devfreq_list_lock); |
25846fa1 | 742 | err_devfreq: |
2f061fd0 | 743 | devfreq_remove_device(devfreq); |
2d803dc8 | 744 | devfreq = NULL; |
9e14de10 | 745 | err_dev: |
8188b154 | 746 | kfree(devfreq); |
3f19f08a AL |
747 | err_out: |
748 | return ERR_PTR(err); | |
a3c98b8b | 749 | } |
7e6fdd4b | 750 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
751 | |
752 | /** | |
753 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 754 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
755 | * |
756 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
757 | */ |
758 | int devfreq_remove_device(struct devfreq *devfreq) | |
759 | { | |
760 | if (!devfreq) | |
761 | return -EINVAL; | |
762 | ||
2f061fd0 VD |
763 | if (devfreq->governor) |
764 | devfreq->governor->event_handler(devfreq, | |
765 | DEVFREQ_GOV_STOP, NULL); | |
585fc83e | 766 | device_unregister(&devfreq->dev); |
9f3bdd4f | 767 | |
a3c98b8b MH |
768 | return 0; |
769 | } | |
7e6fdd4b | 770 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 771 | |
8cd84092 CC |
772 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
773 | { | |
774 | struct devfreq **r = res; | |
775 | ||
776 | if (WARN_ON(!r || !*r)) | |
777 | return 0; | |
778 | ||
779 | return *r == data; | |
780 | } | |
781 | ||
782 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
783 | { | |
784 | devfreq_remove_device(*(struct devfreq **)res); | |
785 | } | |
786 | ||
787 | /** | |
788 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
789 | * @dev: the device to add devfreq feature. | |
790 | * @profile: device-specific profile to run devfreq. | |
791 | * @governor_name: name of the policy to choose frequency. | |
792 | * @data: private data for the governor. The devfreq framework does not | |
793 | * touch this value. | |
794 | * | |
795 | * This function manages automatically the memory of devfreq device using device | |
796 | * resource management and simplify the free operation for memory of devfreq | |
797 | * device. | |
798 | */ | |
799 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
800 | struct devfreq_dev_profile *profile, | |
801 | const char *governor_name, | |
802 | void *data) | |
803 | { | |
804 | struct devfreq **ptr, *devfreq; | |
805 | ||
806 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
807 | if (!ptr) | |
808 | return ERR_PTR(-ENOMEM); | |
809 | ||
810 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
811 | if (IS_ERR(devfreq)) { | |
812 | devres_free(ptr); | |
d1bf2d30 | 813 | return devfreq; |
8cd84092 CC |
814 | } |
815 | ||
816 | *ptr = devfreq; | |
817 | devres_add(dev, ptr); | |
818 | ||
819 | return devfreq; | |
820 | } | |
821 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
822 | ||
8f510aeb CC |
823 | #ifdef CONFIG_OF |
824 | /* | |
825 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
826 | * @dev - instance to the given device | |
827 | * @index - index into list of devfreq | |
828 | * | |
829 | * return the instance of devfreq device | |
830 | */ | |
831 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
832 | { | |
833 | struct device_node *node; | |
834 | struct devfreq *devfreq; | |
835 | ||
836 | if (!dev) | |
837 | return ERR_PTR(-EINVAL); | |
838 | ||
839 | if (!dev->of_node) | |
840 | return ERR_PTR(-EINVAL); | |
841 | ||
842 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
843 | if (!node) | |
844 | return ERR_PTR(-ENODEV); | |
845 | ||
846 | mutex_lock(&devfreq_list_lock); | |
847 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
848 | if (devfreq->dev.parent | |
849 | && devfreq->dev.parent->of_node == node) { | |
850 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 851 | of_node_put(node); |
8f510aeb CC |
852 | return devfreq; |
853 | } | |
854 | } | |
855 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 856 | of_node_put(node); |
8f510aeb CC |
857 | |
858 | return ERR_PTR(-EPROBE_DEFER); | |
859 | } | |
860 | #else | |
861 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
862 | { | |
863 | return ERR_PTR(-ENODEV); | |
864 | } | |
865 | #endif /* CONFIG_OF */ | |
866 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
867 | ||
8cd84092 CC |
868 | /** |
869 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
e2fc1677 | 870 | * @dev: the device from which to remove devfreq feature. |
8cd84092 CC |
871 | * @devfreq: the devfreq instance to be removed |
872 | */ | |
873 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
874 | { | |
875 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
876 | devm_devfreq_dev_match, devfreq)); | |
877 | } | |
878 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
879 | ||
206c30cf RV |
880 | /** |
881 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
882 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
883 | * |
884 | * This function is intended to be called by the pm callbacks | |
885 | * (e.g., runtime_suspend, suspend) of the device driver that | |
886 | * holds the devfreq. | |
206c30cf RV |
887 | */ |
888 | int devfreq_suspend_device(struct devfreq *devfreq) | |
889 | { | |
83f8ca45 LL |
890 | int ret; |
891 | ||
a3c98b8b MH |
892 | if (!devfreq) |
893 | return -EINVAL; | |
894 | ||
83f8ca45 | 895 | if (atomic_inc_return(&devfreq->suspend_count) > 1) |
1b5c1be2 NM |
896 | return 0; |
897 | ||
83f8ca45 LL |
898 | if (devfreq->governor) { |
899 | ret = devfreq->governor->event_handler(devfreq, | |
900 | DEVFREQ_GOV_SUSPEND, NULL); | |
901 | if (ret) | |
902 | return ret; | |
903 | } | |
904 | ||
905 | if (devfreq->suspend_freq) { | |
906 | ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); | |
907 | if (ret) | |
908 | return ret; | |
909 | } | |
910 | ||
911 | return 0; | |
206c30cf RV |
912 | } |
913 | EXPORT_SYMBOL(devfreq_suspend_device); | |
914 | ||
915 | /** | |
916 | * devfreq_resume_device() - Resume devfreq of a device. | |
917 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
918 | * |
919 | * This function is intended to be called by the pm callbacks | |
920 | * (e.g., runtime_resume, resume) of the device driver that | |
921 | * holds the devfreq. | |
206c30cf RV |
922 | */ |
923 | int devfreq_resume_device(struct devfreq *devfreq) | |
924 | { | |
83f8ca45 LL |
925 | int ret; |
926 | ||
206c30cf RV |
927 | if (!devfreq) |
928 | return -EINVAL; | |
929 | ||
83f8ca45 | 930 | if (atomic_dec_return(&devfreq->suspend_count) >= 1) |
1b5c1be2 NM |
931 | return 0; |
932 | ||
83f8ca45 LL |
933 | if (devfreq->resume_freq) { |
934 | ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); | |
935 | if (ret) | |
936 | return ret; | |
937 | } | |
938 | ||
939 | if (devfreq->governor) { | |
940 | ret = devfreq->governor->event_handler(devfreq, | |
941 | DEVFREQ_GOV_RESUME, NULL); | |
942 | if (ret) | |
943 | return ret; | |
944 | } | |
945 | ||
946 | return 0; | |
206c30cf RV |
947 | } |
948 | EXPORT_SYMBOL(devfreq_resume_device); | |
949 | ||
59031956 LL |
950 | /** |
951 | * devfreq_suspend() - Suspend devfreq governors and devices | |
952 | * | |
953 | * Called during system wide Suspend/Hibernate cycles for suspending governors | |
954 | * and devices preserving the state for resume. On some platforms the devfreq | |
955 | * device must have precise state (frequency) after resume in order to provide | |
956 | * fully operating setup. | |
957 | */ | |
958 | void devfreq_suspend(void) | |
959 | { | |
960 | struct devfreq *devfreq; | |
961 | int ret; | |
962 | ||
963 | mutex_lock(&devfreq_list_lock); | |
964 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
965 | ret = devfreq_suspend_device(devfreq); | |
966 | if (ret) | |
967 | dev_err(&devfreq->dev, | |
968 | "failed to suspend devfreq device\n"); | |
969 | } | |
970 | mutex_unlock(&devfreq_list_lock); | |
971 | } | |
972 | ||
973 | /** | |
974 | * devfreq_resume() - Resume devfreq governors and devices | |
975 | * | |
976 | * Called during system wide Suspend/Hibernate cycle for resuming governors and | |
977 | * devices that are suspended with devfreq_suspend(). | |
978 | */ | |
979 | void devfreq_resume(void) | |
980 | { | |
981 | struct devfreq *devfreq; | |
982 | int ret; | |
983 | ||
984 | mutex_lock(&devfreq_list_lock); | |
985 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
986 | ret = devfreq_resume_device(devfreq); | |
987 | if (ret) | |
988 | dev_warn(&devfreq->dev, | |
989 | "failed to resume devfreq device\n"); | |
990 | } | |
991 | mutex_unlock(&devfreq_list_lock); | |
992 | } | |
993 | ||
3aa173b8 NM |
994 | /** |
995 | * devfreq_add_governor() - Add devfreq governor | |
996 | * @governor: the devfreq governor to be added | |
997 | */ | |
998 | int devfreq_add_governor(struct devfreq_governor *governor) | |
999 | { | |
1000 | struct devfreq_governor *g; | |
1b5c1be2 | 1001 | struct devfreq *devfreq; |
3aa173b8 NM |
1002 | int err = 0; |
1003 | ||
1004 | if (!governor) { | |
1005 | pr_err("%s: Invalid parameters.\n", __func__); | |
1006 | return -EINVAL; | |
1007 | } | |
1008 | ||
1009 | mutex_lock(&devfreq_list_lock); | |
1010 | g = find_devfreq_governor(governor->name); | |
1011 | if (!IS_ERR(g)) { | |
1012 | pr_err("%s: governor %s already registered\n", __func__, | |
1013 | g->name); | |
1014 | err = -EINVAL; | |
1015 | goto err_out; | |
1016 | } | |
9f3bdd4f | 1017 | |
3aa173b8 NM |
1018 | list_add(&governor->node, &devfreq_governor_list); |
1019 | ||
1b5c1be2 NM |
1020 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1021 | int ret = 0; | |
1022 | struct device *dev = devfreq->dev.parent; | |
1023 | ||
1024 | if (!strncmp(devfreq->governor_name, governor->name, | |
1025 | DEVFREQ_NAME_LEN)) { | |
1026 | /* The following should never occur */ | |
1027 | if (devfreq->governor) { | |
1028 | dev_warn(dev, | |
1029 | "%s: Governor %s already present\n", | |
1030 | __func__, devfreq->governor->name); | |
1031 | ret = devfreq->governor->event_handler(devfreq, | |
1032 | DEVFREQ_GOV_STOP, NULL); | |
1033 | if (ret) { | |
1034 | dev_warn(dev, | |
1035 | "%s: Governor %s stop = %d\n", | |
1036 | __func__, | |
1037 | devfreq->governor->name, ret); | |
1038 | } | |
1039 | /* Fall through */ | |
1040 | } | |
1041 | devfreq->governor = governor; | |
1042 | ret = devfreq->governor->event_handler(devfreq, | |
1043 | DEVFREQ_GOV_START, NULL); | |
1044 | if (ret) { | |
1045 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
1046 | __func__, devfreq->governor->name, | |
1047 | ret); | |
1048 | } | |
a3c98b8b MH |
1049 | } |
1050 | } | |
1051 | ||
3aa173b8 NM |
1052 | err_out: |
1053 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 1054 | |
3aa173b8 NM |
1055 | return err; |
1056 | } | |
1057 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 1058 | |
3aa173b8 | 1059 | /** |
bafeb42b | 1060 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
1061 | * @governor: the devfreq governor to be removed |
1062 | */ | |
1063 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
1064 | { | |
1065 | struct devfreq_governor *g; | |
1b5c1be2 | 1066 | struct devfreq *devfreq; |
3aa173b8 NM |
1067 | int err = 0; |
1068 | ||
1069 | if (!governor) { | |
1070 | pr_err("%s: Invalid parameters.\n", __func__); | |
1071 | return -EINVAL; | |
1072 | } | |
1073 | ||
1074 | mutex_lock(&devfreq_list_lock); | |
1075 | g = find_devfreq_governor(governor->name); | |
1076 | if (IS_ERR(g)) { | |
1077 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 1078 | governor->name); |
f9c08e2a | 1079 | err = PTR_ERR(g); |
3aa173b8 NM |
1080 | goto err_out; |
1081 | } | |
1b5c1be2 NM |
1082 | list_for_each_entry(devfreq, &devfreq_list, node) { |
1083 | int ret; | |
1084 | struct device *dev = devfreq->dev.parent; | |
1085 | ||
1086 | if (!strncmp(devfreq->governor_name, governor->name, | |
1087 | DEVFREQ_NAME_LEN)) { | |
1088 | /* we should have a devfreq governor! */ | |
1089 | if (!devfreq->governor) { | |
1090 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
1091 | __func__, governor->name); | |
1092 | continue; | |
1093 | /* Fall through */ | |
1094 | } | |
1095 | ret = devfreq->governor->event_handler(devfreq, | |
1096 | DEVFREQ_GOV_STOP, NULL); | |
1097 | if (ret) { | |
1098 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
1099 | __func__, devfreq->governor->name, | |
1100 | ret); | |
1101 | } | |
1102 | devfreq->governor = NULL; | |
1103 | } | |
1104 | } | |
3aa173b8 NM |
1105 | |
1106 | list_del(&governor->node); | |
1107 | err_out: | |
1108 | mutex_unlock(&devfreq_list_lock); | |
1109 | ||
1110 | return err; | |
a3c98b8b | 1111 | } |
3aa173b8 | 1112 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 1113 | |
a93d6b0a | 1114 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
1115 | struct device_attribute *attr, char *buf) |
1116 | { | |
1b5c1be2 NM |
1117 | if (!to_devfreq(dev)->governor) |
1118 | return -EINVAL; | |
1119 | ||
9005b650 MH |
1120 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
1121 | } | |
1122 | ||
a93d6b0a | 1123 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
1124 | const char *buf, size_t count) |
1125 | { | |
1126 | struct devfreq *df = to_devfreq(dev); | |
1127 | int ret; | |
1128 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
bc658bef | 1129 | const struct devfreq_governor *governor, *prev_governor; |
0359d1af NM |
1130 | |
1131 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
1132 | if (ret != 1) | |
1133 | return -EINVAL; | |
1134 | ||
1135 | mutex_lock(&devfreq_list_lock); | |
23c7b54c | 1136 | governor = try_then_request_governor(str_governor); |
0359d1af NM |
1137 | if (IS_ERR(governor)) { |
1138 | ret = PTR_ERR(governor); | |
1139 | goto out; | |
1140 | } | |
14a21e7b TJ |
1141 | if (df->governor == governor) { |
1142 | ret = 0; | |
0359d1af | 1143 | goto out; |
63f1e05f GS |
1144 | } else if ((df->governor && df->governor->immutable) || |
1145 | governor->immutable) { | |
bcf23c79 CC |
1146 | ret = -EINVAL; |
1147 | goto out; | |
14a21e7b | 1148 | } |
0359d1af NM |
1149 | |
1150 | if (df->governor) { | |
1151 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1152 | if (ret) { | |
1153 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1154 | __func__, df->governor->name, ret); | |
1155 | goto out; | |
1156 | } | |
1157 | } | |
bc658bef | 1158 | prev_governor = df->governor; |
0359d1af NM |
1159 | df->governor = governor; |
1160 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
1161 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
bc658bef | 1162 | if (ret) { |
0359d1af NM |
1163 | dev_warn(dev, "%s: Governor %s not started(%d)\n", |
1164 | __func__, df->governor->name, ret); | |
bc658bef SK |
1165 | df->governor = prev_governor; |
1166 | strncpy(df->governor_name, prev_governor->name, | |
1167 | DEVFREQ_NAME_LEN); | |
1168 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1169 | if (ret) { | |
1170 | dev_err(dev, | |
1171 | "%s: reverting to Governor %s failed (%d)\n", | |
1172 | __func__, df->governor_name, ret); | |
1173 | df->governor = NULL; | |
1174 | } | |
1175 | } | |
0359d1af NM |
1176 | out: |
1177 | mutex_unlock(&devfreq_list_lock); | |
1178 | ||
1179 | if (!ret) | |
1180 | ret = count; | |
1181 | return ret; | |
1182 | } | |
a93d6b0a GKH |
1183 | static DEVICE_ATTR_RW(governor); |
1184 | ||
1185 | static ssize_t available_governors_show(struct device *d, | |
1186 | struct device_attribute *attr, | |
1187 | char *buf) | |
50a5b33e | 1188 | { |
bcf23c79 | 1189 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1190 | ssize_t count = 0; |
1191 | ||
1192 | mutex_lock(&devfreq_list_lock); | |
bcf23c79 CC |
1193 | |
1194 | /* | |
1195 | * The devfreq with immutable governor (e.g., passive) shows | |
1196 | * only own governor. | |
1197 | */ | |
1198 | if (df->governor->immutable) { | |
1199 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, | |
6d690f77 | 1200 | "%s ", df->governor_name); |
bcf23c79 CC |
1201 | /* |
1202 | * The devfreq device shows the registered governor except for | |
1203 | * immutable governors such as passive governor . | |
1204 | */ | |
1205 | } else { | |
1206 | struct devfreq_governor *governor; | |
1207 | ||
1208 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
1209 | if (governor->immutable) | |
1210 | continue; | |
1211 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1212 | "%s ", governor->name); | |
1213 | } | |
1214 | } | |
1215 | ||
50a5b33e NM |
1216 | mutex_unlock(&devfreq_list_lock); |
1217 | ||
1218 | /* Truncate the trailing space */ | |
1219 | if (count) | |
1220 | count--; | |
1221 | ||
1222 | count += sprintf(&buf[count], "\n"); | |
1223 | ||
1224 | return count; | |
1225 | } | |
a93d6b0a | 1226 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1227 | |
a93d6b0a GKH |
1228 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1229 | char *buf) | |
7f98a905 RV |
1230 | { |
1231 | unsigned long freq; | |
1232 | struct devfreq *devfreq = to_devfreq(dev); | |
1233 | ||
1234 | if (devfreq->profile->get_cur_freq && | |
1235 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
9d0109be | 1236 | return sprintf(buf, "%lu\n", freq); |
7f98a905 RV |
1237 | |
1238 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1239 | } | |
a93d6b0a | 1240 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1241 | |
a93d6b0a GKH |
1242 | static ssize_t target_freq_show(struct device *dev, |
1243 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1244 | { |
1245 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1246 | } | |
a93d6b0a | 1247 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1248 | |
a93d6b0a | 1249 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1250 | struct device_attribute *attr, char *buf) |
1251 | { | |
1252 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1253 | } | |
1254 | ||
a93d6b0a | 1255 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1256 | struct device_attribute *attr, |
1257 | const char *buf, size_t count) | |
1258 | { | |
1259 | struct devfreq *df = to_devfreq(dev); | |
1260 | unsigned int value; | |
1261 | int ret; | |
1262 | ||
1b5c1be2 NM |
1263 | if (!df->governor) |
1264 | return -EINVAL; | |
1265 | ||
9005b650 MH |
1266 | ret = sscanf(buf, "%u", &value); |
1267 | if (ret != 1) | |
12e26265 | 1268 | return -EINVAL; |
9005b650 | 1269 | |
7e6fdd4b | 1270 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
1271 | ret = count; |
1272 | ||
9005b650 MH |
1273 | return ret; |
1274 | } | |
a93d6b0a | 1275 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1276 | |
a93d6b0a | 1277 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1278 | const char *buf, size_t count) |
1279 | { | |
1280 | struct devfreq *df = to_devfreq(dev); | |
1281 | unsigned long value; | |
1282 | int ret; | |
6530b9de MH |
1283 | |
1284 | ret = sscanf(buf, "%lu", &value); | |
1285 | if (ret != 1) | |
12e26265 | 1286 | return -EINVAL; |
6530b9de MH |
1287 | |
1288 | mutex_lock(&df->lock); | |
df5cf4a3 MK |
1289 | |
1290 | if (value) { | |
1291 | if (value > df->max_freq) { | |
1292 | ret = -EINVAL; | |
1293 | goto unlock; | |
1294 | } | |
1295 | } else { | |
1296 | unsigned long *freq_table = df->profile->freq_table; | |
1297 | ||
1298 | /* Get minimum frequency according to sorting order */ | |
1299 | if (freq_table[0] < freq_table[df->profile->max_state - 1]) | |
1300 | value = freq_table[0]; | |
1301 | else | |
1302 | value = freq_table[df->profile->max_state - 1]; | |
6530b9de MH |
1303 | } |
1304 | ||
1305 | df->min_freq = value; | |
1306 | update_devfreq(df); | |
1307 | ret = count; | |
1308 | unlock: | |
1309 | mutex_unlock(&df->lock); | |
6530b9de MH |
1310 | return ret; |
1311 | } | |
1312 | ||
1051e2c3 CC |
1313 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1314 | char *buf) | |
1315 | { | |
f1d981ea CC |
1316 | struct devfreq *df = to_devfreq(dev); |
1317 | ||
d0e46420 | 1318 | return sprintf(buf, "%lu\n", max(df->scaling_min_freq, df->min_freq)); |
1051e2c3 CC |
1319 | } |
1320 | ||
a93d6b0a | 1321 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1322 | const char *buf, size_t count) |
1323 | { | |
1324 | struct devfreq *df = to_devfreq(dev); | |
1325 | unsigned long value; | |
1326 | int ret; | |
6530b9de MH |
1327 | |
1328 | ret = sscanf(buf, "%lu", &value); | |
1329 | if (ret != 1) | |
12e26265 | 1330 | return -EINVAL; |
6530b9de MH |
1331 | |
1332 | mutex_lock(&df->lock); | |
df5cf4a3 MK |
1333 | |
1334 | if (value) { | |
1335 | if (value < df->min_freq) { | |
1336 | ret = -EINVAL; | |
1337 | goto unlock; | |
1338 | } | |
1339 | } else { | |
1340 | unsigned long *freq_table = df->profile->freq_table; | |
1341 | ||
1342 | /* Get maximum frequency according to sorting order */ | |
1343 | if (freq_table[0] < freq_table[df->profile->max_state - 1]) | |
1344 | value = freq_table[df->profile->max_state - 1]; | |
1345 | else | |
1346 | value = freq_table[0]; | |
6530b9de MH |
1347 | } |
1348 | ||
1349 | df->max_freq = value; | |
1350 | update_devfreq(df); | |
1351 | ret = count; | |
1352 | unlock: | |
1353 | mutex_unlock(&df->lock); | |
6530b9de MH |
1354 | return ret; |
1355 | } | |
1051e2c3 | 1356 | static DEVICE_ATTR_RW(min_freq); |
6530b9de | 1357 | |
1051e2c3 CC |
1358 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1359 | char *buf) | |
1360 | { | |
f1d981ea CC |
1361 | struct devfreq *df = to_devfreq(dev); |
1362 | ||
d0e46420 | 1363 | return sprintf(buf, "%lu\n", min(df->scaling_max_freq, df->max_freq)); |
6530b9de | 1364 | } |
a93d6b0a | 1365 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1366 | |
a93d6b0a GKH |
1367 | static ssize_t available_frequencies_show(struct device *d, |
1368 | struct device_attribute *attr, | |
1369 | char *buf) | |
d287de85 NM |
1370 | { |
1371 | struct devfreq *df = to_devfreq(d); | |
d287de85 | 1372 | ssize_t count = 0; |
416b46a2 | 1373 | int i; |
d287de85 | 1374 | |
416b46a2 | 1375 | mutex_lock(&df->lock); |
d287de85 | 1376 | |
416b46a2 | 1377 | for (i = 0; i < df->profile->max_state; i++) |
d287de85 | 1378 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
416b46a2 | 1379 | "%lu ", df->profile->freq_table[i]); |
d287de85 | 1380 | |
416b46a2 | 1381 | mutex_unlock(&df->lock); |
d287de85 NM |
1382 | /* Truncate the trailing space */ |
1383 | if (count) | |
1384 | count--; | |
1385 | ||
1386 | count += sprintf(&buf[count], "\n"); | |
1387 | ||
1388 | return count; | |
1389 | } | |
a93d6b0a | 1390 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1391 | |
a93d6b0a GKH |
1392 | static ssize_t trans_stat_show(struct device *dev, |
1393 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1394 | { |
1395 | struct devfreq *devfreq = to_devfreq(dev); | |
1396 | ssize_t len; | |
39688ce6 | 1397 | int i, j; |
e552bbaf JL |
1398 | unsigned int max_state = devfreq->profile->max_state; |
1399 | ||
39688ce6 RV |
1400 | if (!devfreq->stop_polling && |
1401 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1402 | return 0; |
34bd3220 MH |
1403 | if (max_state == 0) |
1404 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1405 | |
d7df1e46 CC |
1406 | len = sprintf(buf, " From : To\n"); |
1407 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1408 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1409 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1410 | devfreq->profile->freq_table[i]); |
1411 | ||
1412 | len += sprintf(buf + len, " time(ms)\n"); | |
1413 | ||
1414 | for (i = 0; i < max_state; i++) { | |
1415 | if (devfreq->profile->freq_table[i] | |
1416 | == devfreq->previous_freq) { | |
1417 | len += sprintf(buf + len, "*"); | |
1418 | } else { | |
1419 | len += sprintf(buf + len, " "); | |
1420 | } | |
d7df1e46 | 1421 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1422 | devfreq->profile->freq_table[i]); |
1423 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1424 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1425 | devfreq->trans_table[(i * max_state) + j]); |
1426 | len += sprintf(buf + len, "%10u\n", | |
1427 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1428 | } | |
1429 | ||
1430 | len += sprintf(buf + len, "Total transition : %u\n", | |
1431 | devfreq->total_trans); | |
1432 | return len; | |
1433 | } | |
a93d6b0a GKH |
1434 | static DEVICE_ATTR_RO(trans_stat); |
1435 | ||
1436 | static struct attribute *devfreq_attrs[] = { | |
1437 | &dev_attr_governor.attr, | |
1438 | &dev_attr_available_governors.attr, | |
1439 | &dev_attr_cur_freq.attr, | |
1440 | &dev_attr_available_frequencies.attr, | |
1441 | &dev_attr_target_freq.attr, | |
1442 | &dev_attr_polling_interval.attr, | |
1443 | &dev_attr_min_freq.attr, | |
1444 | &dev_attr_max_freq.attr, | |
1445 | &dev_attr_trans_stat.attr, | |
1446 | NULL, | |
9005b650 | 1447 | }; |
a93d6b0a | 1448 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1449 | |
a3c98b8b MH |
1450 | static int __init devfreq_init(void) |
1451 | { | |
1452 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1453 | if (IS_ERR(devfreq_class)) { | |
1454 | pr_err("%s: couldn't create class\n", __FILE__); | |
1455 | return PTR_ERR(devfreq_class); | |
1456 | } | |
7e6fdd4b RV |
1457 | |
1458 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1459 | if (!devfreq_wq) { |
7e6fdd4b RV |
1460 | class_destroy(devfreq_class); |
1461 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1462 | return -ENOMEM; |
7e6fdd4b | 1463 | } |
a93d6b0a | 1464 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1465 | |
a3c98b8b MH |
1466 | return 0; |
1467 | } | |
1468 | subsys_initcall(devfreq_init); | |
1469 | ||
a3c98b8b | 1470 | /* |
4091fb95 | 1471 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1472 | * OPP framework. |
1473 | */ | |
1474 | ||
1475 | /** | |
1476 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1477 | * freq value given to target callback. | |
c5b4a1c1 NM |
1478 | * @dev: The devfreq user device. (parent of devfreq) |
1479 | * @freq: The frequency given to target function | |
1480 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1481 | * |
8a31d9d9 VK |
1482 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1483 | * use. | |
a3c98b8b | 1484 | */ |
47d43ba7 NM |
1485 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1486 | unsigned long *freq, | |
1487 | u32 flags) | |
a3c98b8b | 1488 | { |
47d43ba7 | 1489 | struct dev_pm_opp *opp; |
a3c98b8b | 1490 | |
ab5f299f MH |
1491 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1492 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1493 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1494 | |
1495 | /* If not available, use the closest opp */ | |
0779726c | 1496 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1497 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1498 | } else { |
1499 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1500 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1501 | |
1502 | /* If not available, use the closest opp */ | |
0779726c | 1503 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1504 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1505 | } |
1506 | ||
a3c98b8b MH |
1507 | return opp; |
1508 | } | |
bd7e9277 | 1509 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1510 | |
1511 | /** | |
1512 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
6d690f77 MH |
1513 | * for any changes in the OPP availability |
1514 | * changes | |
c5b4a1c1 NM |
1515 | * @dev: The devfreq user device. (parent of devfreq) |
1516 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1517 | */ |
1518 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1519 | { | |
dc2c9ad5 | 1520 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 1521 | } |
bd7e9277 | 1522 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1523 | |
1524 | /** | |
1525 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
6d690f77 MH |
1526 | * notified for any changes in the OPP |
1527 | * availability changes anymore. | |
c5b4a1c1 NM |
1528 | * @dev: The devfreq user device. (parent of devfreq) |
1529 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1530 | * |
1531 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1532 | * devfreq_recommended_opp is used. | |
1533 | */ | |
1534 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1535 | { | |
dc2c9ad5 | 1536 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 1537 | } |
bd7e9277 | 1538 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1539 | |
d5b040d0 CC |
1540 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1541 | { | |
1542 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1543 | } | |
1544 | ||
1545 | /** | |
6d690f77 MH |
1546 | * devm_devfreq_register_opp_notifier() - Resource-managed |
1547 | * devfreq_register_opp_notifier() | |
d5b040d0 CC |
1548 | * @dev: The devfreq user device. (parent of devfreq) |
1549 | * @devfreq: The devfreq object. | |
1550 | */ | |
1551 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1552 | struct devfreq *devfreq) | |
1553 | { | |
1554 | struct devfreq **ptr; | |
1555 | int ret; | |
1556 | ||
1557 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1558 | if (!ptr) | |
1559 | return -ENOMEM; | |
1560 | ||
1561 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1562 | if (ret) { | |
1563 | devres_free(ptr); | |
1564 | return ret; | |
1565 | } | |
1566 | ||
1567 | *ptr = devfreq; | |
1568 | devres_add(dev, ptr); | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1573 | ||
1574 | /** | |
6d690f77 MH |
1575 | * devm_devfreq_unregister_opp_notifier() - Resource-managed |
1576 | * devfreq_unregister_opp_notifier() | |
d5b040d0 CC |
1577 | * @dev: The devfreq user device. (parent of devfreq) |
1578 | * @devfreq: The devfreq object. | |
1579 | */ | |
1580 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1581 | struct devfreq *devfreq) | |
1582 | { | |
1583 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1584 | devm_devfreq_dev_match, devfreq)); | |
1585 | } | |
1586 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1587 | ||
0fe3a664 CC |
1588 | /** |
1589 | * devfreq_register_notifier() - Register a driver with devfreq | |
1590 | * @devfreq: The devfreq object. | |
1591 | * @nb: The notifier block to register. | |
1592 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1593 | */ | |
1594 | int devfreq_register_notifier(struct devfreq *devfreq, | |
6d690f77 MH |
1595 | struct notifier_block *nb, |
1596 | unsigned int list) | |
0fe3a664 CC |
1597 | { |
1598 | int ret = 0; | |
1599 | ||
1600 | if (!devfreq) | |
1601 | return -EINVAL; | |
1602 | ||
1603 | switch (list) { | |
1604 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1605 | ret = srcu_notifier_chain_register( | |
1606 | &devfreq->transition_notifier_list, nb); | |
1607 | break; | |
1608 | default: | |
1609 | ret = -EINVAL; | |
1610 | } | |
1611 | ||
1612 | return ret; | |
1613 | } | |
1614 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1615 | ||
1616 | /* | |
1617 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1618 | * @devfreq: The devfreq object. | |
1619 | * @nb: The notifier block to be unregistered. | |
1620 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1621 | */ | |
1622 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1623 | struct notifier_block *nb, | |
1624 | unsigned int list) | |
1625 | { | |
1626 | int ret = 0; | |
1627 | ||
1628 | if (!devfreq) | |
1629 | return -EINVAL; | |
1630 | ||
1631 | switch (list) { | |
1632 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1633 | ret = srcu_notifier_chain_unregister( | |
1634 | &devfreq->transition_notifier_list, nb); | |
1635 | break; | |
1636 | default: | |
1637 | ret = -EINVAL; | |
1638 | } | |
1639 | ||
1640 | return ret; | |
1641 | } | |
1642 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1643 | ||
1644 | struct devfreq_notifier_devres { | |
1645 | struct devfreq *devfreq; | |
1646 | struct notifier_block *nb; | |
1647 | unsigned int list; | |
1648 | }; | |
1649 | ||
1650 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1651 | { | |
1652 | struct devfreq_notifier_devres *this = res; | |
1653 | ||
1654 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1655 | } | |
1656 | ||
1657 | /** | |
1658 | * devm_devfreq_register_notifier() | |
1659 | - Resource-managed devfreq_register_notifier() | |
1660 | * @dev: The devfreq user device. (parent of devfreq) | |
1661 | * @devfreq: The devfreq object. | |
1662 | * @nb: The notifier block to be unregistered. | |
1663 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1664 | */ | |
1665 | int devm_devfreq_register_notifier(struct device *dev, | |
1666 | struct devfreq *devfreq, | |
1667 | struct notifier_block *nb, | |
1668 | unsigned int list) | |
1669 | { | |
1670 | struct devfreq_notifier_devres *ptr; | |
1671 | int ret; | |
1672 | ||
1673 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1674 | GFP_KERNEL); | |
1675 | if (!ptr) | |
1676 | return -ENOMEM; | |
1677 | ||
1678 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1679 | if (ret) { | |
1680 | devres_free(ptr); | |
1681 | return ret; | |
1682 | } | |
1683 | ||
1684 | ptr->devfreq = devfreq; | |
1685 | ptr->nb = nb; | |
1686 | ptr->list = list; | |
1687 | devres_add(dev, ptr); | |
1688 | ||
1689 | return 0; | |
1690 | } | |
1691 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1692 | ||
1693 | /** | |
1694 | * devm_devfreq_unregister_notifier() | |
1695 | - Resource-managed devfreq_unregister_notifier() | |
1696 | * @dev: The devfreq user device. (parent of devfreq) | |
1697 | * @devfreq: The devfreq object. | |
1698 | * @nb: The notifier block to be unregistered. | |
1699 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1700 | */ | |
1701 | void devm_devfreq_unregister_notifier(struct device *dev, | |
6d690f77 MH |
1702 | struct devfreq *devfreq, |
1703 | struct notifier_block *nb, | |
1704 | unsigned int list) | |
0fe3a664 CC |
1705 | { |
1706 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1707 | devm_devfreq_dev_match, devfreq)); | |
1708 | } | |
1709 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |