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Commit | Line | Data |
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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> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/init.h> | |
417dc4bb | 18 | #include <linux/export.h> |
a3c98b8b | 19 | #include <linux/slab.h> |
952f6d13 | 20 | #include <linux/stat.h> |
e4db1c74 | 21 | #include <linux/pm_opp.h> |
a3c98b8b MH |
22 | #include <linux/devfreq.h> |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/printk.h> | |
27 | #include <linux/hrtimer.h> | |
8f510aeb | 28 | #include <linux/of.h> |
a3c98b8b MH |
29 | #include "governor.h" |
30 | ||
1a1357ea | 31 | static struct class *devfreq_class; |
a3c98b8b MH |
32 | |
33 | /* | |
7e6fdd4b RV |
34 | * devfreq core provides delayed work based load monitoring helper |
35 | * functions. Governors can use these or can implement their own | |
36 | * monitoring mechanism. | |
a3c98b8b | 37 | */ |
a3c98b8b | 38 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 39 | |
3aa173b8 NM |
40 | /* The list of all device-devfreq governors */ |
41 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
42 | /* The list of all device-devfreq */ |
43 | static LIST_HEAD(devfreq_list); | |
44 | static DEFINE_MUTEX(devfreq_list_lock); | |
45 | ||
46 | /** | |
47 | * find_device_devfreq() - find devfreq struct using device pointer | |
48 | * @dev: device pointer used to lookup device devfreq. | |
49 | * | |
50 | * Search the list of device devfreqs and return the matched device's | |
51 | * devfreq info. devfreq_list_lock should be held by the caller. | |
52 | */ | |
53 | static struct devfreq *find_device_devfreq(struct device *dev) | |
54 | { | |
55 | struct devfreq *tmp_devfreq; | |
56 | ||
9348da2f | 57 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
58 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
59 | return ERR_PTR(-EINVAL); | |
60 | } | |
61 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
62 | "devfreq_list_lock must be locked."); | |
63 | ||
64 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
65 | if (tmp_devfreq->dev.parent == dev) | |
66 | return tmp_devfreq; | |
67 | } | |
68 | ||
69 | return ERR_PTR(-ENODEV); | |
70 | } | |
71 | ||
e552bbaf JL |
72 | /** |
73 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
74 | * @devfreq: the devfreq instance | |
75 | * @freq: the target frequency | |
76 | */ | |
77 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
78 | { | |
79 | int lev; | |
80 | ||
81 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
82 | if (freq == devfreq->profile->freq_table[lev]) | |
83 | return lev; | |
84 | ||
85 | return -EINVAL; | |
86 | } | |
87 | ||
0ec09ac2 CC |
88 | /** |
89 | * devfreq_set_freq_table() - Initialize freq_table for the frequency | |
90 | * @devfreq: the devfreq instance | |
91 | */ | |
92 | static void devfreq_set_freq_table(struct devfreq *devfreq) | |
93 | { | |
94 | struct devfreq_dev_profile *profile = devfreq->profile; | |
95 | struct dev_pm_opp *opp; | |
96 | unsigned long freq; | |
97 | int i, count; | |
98 | ||
99 | /* Initialize the freq_table from OPP table */ | |
100 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
101 | if (count <= 0) | |
102 | return; | |
103 | ||
104 | profile->max_state = count; | |
105 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
106 | profile->max_state, | |
107 | sizeof(*profile->freq_table), | |
108 | GFP_KERNEL); | |
109 | if (!profile->freq_table) { | |
110 | profile->max_state = 0; | |
111 | return; | |
112 | } | |
113 | ||
114 | rcu_read_lock(); | |
115 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { | |
116 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
117 | if (IS_ERR(opp)) { | |
118 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
119 | profile->max_state = 0; | |
120 | rcu_read_unlock(); | |
121 | return; | |
122 | } | |
123 | profile->freq_table[i] = freq; | |
124 | } | |
125 | rcu_read_unlock(); | |
126 | } | |
127 | ||
e552bbaf JL |
128 | /** |
129 | * devfreq_update_status() - Update statistics of devfreq behavior | |
130 | * @devfreq: the devfreq instance | |
131 | * @freq: the update target frequency | |
132 | */ | |
4c86c6f2 | 133 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 134 | { |
e35d35a1 | 135 | int lev, prev_lev, ret = 0; |
e552bbaf JL |
136 | unsigned long cur_time; |
137 | ||
e552bbaf | 138 | cur_time = jiffies; |
e35d35a1 | 139 | |
d0563a03 TJ |
140 | /* Immediately exit if previous_freq is not initialized yet. */ |
141 | if (!devfreq->previous_freq) | |
142 | goto out; | |
143 | ||
e35d35a1 SK |
144 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
145 | if (prev_lev < 0) { | |
146 | ret = prev_lev; | |
147 | goto out; | |
148 | } | |
149 | ||
150 | devfreq->time_in_state[prev_lev] += | |
e552bbaf | 151 | cur_time - devfreq->last_stat_updated; |
e35d35a1 SK |
152 | |
153 | lev = devfreq_get_freq_level(devfreq, freq); | |
154 | if (lev < 0) { | |
155 | ret = lev; | |
156 | goto out; | |
157 | } | |
158 | ||
159 | if (lev != prev_lev) { | |
e552bbaf JL |
160 | devfreq->trans_table[(prev_lev * |
161 | devfreq->profile->max_state) + lev]++; | |
162 | devfreq->total_trans++; | |
163 | } | |
e552bbaf | 164 | |
e35d35a1 SK |
165 | out: |
166 | devfreq->last_stat_updated = cur_time; | |
167 | return ret; | |
e552bbaf | 168 | } |
4c86c6f2 | 169 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 170 | |
3aa173b8 NM |
171 | /** |
172 | * find_devfreq_governor() - find devfreq governor from name | |
173 | * @name: name of the governor | |
174 | * | |
175 | * Search the list of devfreq governors and return the matched | |
176 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
177 | */ | |
178 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
179 | { | |
180 | struct devfreq_governor *tmp_governor; | |
181 | ||
9348da2f | 182 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
183 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
184 | return ERR_PTR(-EINVAL); | |
185 | } | |
186 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
187 | "devfreq_list_lock must be locked."); | |
188 | ||
189 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
190 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
191 | return tmp_governor; | |
192 | } | |
193 | ||
194 | return ERR_PTR(-ENODEV); | |
195 | } | |
196 | ||
0fe3a664 CC |
197 | static int devfreq_notify_transition(struct devfreq *devfreq, |
198 | struct devfreq_freqs *freqs, unsigned int state) | |
199 | { | |
200 | if (!devfreq) | |
201 | return -EINVAL; | |
202 | ||
203 | switch (state) { | |
204 | case DEVFREQ_PRECHANGE: | |
205 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
206 | DEVFREQ_PRECHANGE, freqs); | |
207 | break; | |
208 | ||
209 | case DEVFREQ_POSTCHANGE: | |
210 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
211 | DEVFREQ_POSTCHANGE, freqs); | |
212 | break; | |
213 | default: | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
7e6fdd4b RV |
220 | /* Load monitoring helper functions for governors use */ |
221 | ||
a3c98b8b MH |
222 | /** |
223 | * update_devfreq() - Reevaluate the device and configure frequency. | |
224 | * @devfreq: the devfreq instance. | |
225 | * | |
226 | * Note: Lock devfreq->lock before calling update_devfreq | |
227 | * This function is exported for governors. | |
228 | */ | |
229 | int update_devfreq(struct devfreq *devfreq) | |
230 | { | |
0fe3a664 CC |
231 | struct devfreq_freqs freqs; |
232 | unsigned long freq, cur_freq; | |
a3c98b8b | 233 | int err = 0; |
ab5f299f | 234 | u32 flags = 0; |
a3c98b8b MH |
235 | |
236 | if (!mutex_is_locked(&devfreq->lock)) { | |
237 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
238 | return -EINVAL; | |
239 | } | |
240 | ||
1b5c1be2 NM |
241 | if (!devfreq->governor) |
242 | return -EINVAL; | |
243 | ||
a3c98b8b MH |
244 | /* Reevaluate the proper frequency */ |
245 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
246 | if (err) | |
247 | return err; | |
248 | ||
ab5f299f | 249 | /* |
d3b7e174 | 250 | * Adjust the frequency with user freq and QoS. |
ab5f299f | 251 | * |
d3b7e174 JM |
252 | * List from the highest priority |
253 | * max_freq | |
ab5f299f MH |
254 | * min_freq |
255 | */ | |
256 | ||
257 | if (devfreq->min_freq && freq < devfreq->min_freq) { | |
258 | freq = devfreq->min_freq; | |
259 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ | |
260 | } | |
261 | if (devfreq->max_freq && freq > devfreq->max_freq) { | |
262 | freq = devfreq->max_freq; | |
263 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ | |
264 | } | |
265 | ||
0fe3a664 CC |
266 | if (devfreq->profile->get_cur_freq) |
267 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
268 | else | |
269 | cur_freq = devfreq->previous_freq; | |
270 | ||
271 | freqs.old = cur_freq; | |
272 | freqs.new = freq; | |
273 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
274 | ||
ab5f299f | 275 | err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); |
0d37189e CC |
276 | if (err) { |
277 | freqs.new = cur_freq; | |
278 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
a3c98b8b | 279 | return err; |
0d37189e | 280 | } |
a3c98b8b | 281 | |
0fe3a664 CC |
282 | freqs.new = freq; |
283 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
284 | ||
e552bbaf JL |
285 | if (devfreq->profile->freq_table) |
286 | if (devfreq_update_status(devfreq, freq)) | |
287 | dev_err(&devfreq->dev, | |
288 | "Couldn't update frequency transition information.\n"); | |
289 | ||
a3c98b8b MH |
290 | devfreq->previous_freq = freq; |
291 | return err; | |
292 | } | |
2df5021f | 293 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 294 | |
7e6fdd4b RV |
295 | /** |
296 | * devfreq_monitor() - Periodically poll devfreq objects. | |
297 | * @work: the work struct used to run devfreq_monitor periodically. | |
298 | * | |
299 | */ | |
300 | static void devfreq_monitor(struct work_struct *work) | |
301 | { | |
302 | int err; | |
303 | struct devfreq *devfreq = container_of(work, | |
304 | struct devfreq, work.work); | |
305 | ||
306 | mutex_lock(&devfreq->lock); | |
307 | err = update_devfreq(devfreq); | |
308 | if (err) | |
309 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
310 | ||
311 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
312 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
313 | mutex_unlock(&devfreq->lock); | |
314 | } | |
315 | ||
316 | /** | |
317 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
318 | * @devfreq: the devfreq instance. | |
319 | * | |
320 | * Helper function for starting devfreq device load monitoing. By | |
321 | * default delayed work based monitoring is supported. Function | |
322 | * to be called from governor in response to DEVFREQ_GOV_START | |
323 | * event when device is added to devfreq framework. | |
324 | */ | |
325 | void devfreq_monitor_start(struct devfreq *devfreq) | |
326 | { | |
327 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
328 | if (devfreq->profile->polling_ms) | |
329 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
330 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
331 | } | |
6dcdd8e3 | 332 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
333 | |
334 | /** | |
335 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
336 | * @devfreq: the devfreq instance. | |
337 | * | |
338 | * Helper function to stop devfreq device load monitoing. Function | |
339 | * to be called from governor in response to DEVFREQ_GOV_STOP | |
340 | * event when device is removed from devfreq framework. | |
341 | */ | |
342 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
343 | { | |
344 | cancel_delayed_work_sync(&devfreq->work); | |
345 | } | |
6dcdd8e3 | 346 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
347 | |
348 | /** | |
349 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
350 | * @devfreq: the devfreq instance. | |
351 | * | |
352 | * Helper function to suspend devfreq device load monitoing. Function | |
353 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND | |
354 | * event or when polling interval is set to zero. | |
355 | * | |
356 | * Note: Though this function is same as devfreq_monitor_stop(), | |
357 | * intentionally kept separate to provide hooks for collecting | |
358 | * transition statistics. | |
359 | */ | |
360 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
361 | { | |
362 | mutex_lock(&devfreq->lock); | |
363 | if (devfreq->stop_polling) { | |
364 | mutex_unlock(&devfreq->lock); | |
365 | return; | |
366 | } | |
367 | ||
39688ce6 | 368 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
369 | devfreq->stop_polling = true; |
370 | mutex_unlock(&devfreq->lock); | |
371 | cancel_delayed_work_sync(&devfreq->work); | |
372 | } | |
6dcdd8e3 | 373 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
374 | |
375 | /** | |
376 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
377 | * @devfreq: the devfreq instance. | |
378 | * | |
379 | * Helper function to resume devfreq device load monitoing. Function | |
380 | * to be called from governor in response to DEVFREQ_GOV_RESUME | |
381 | * event or when polling interval is set to non-zero. | |
382 | */ | |
383 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
384 | { | |
39688ce6 RV |
385 | unsigned long freq; |
386 | ||
7e6fdd4b RV |
387 | mutex_lock(&devfreq->lock); |
388 | if (!devfreq->stop_polling) | |
389 | goto out; | |
390 | ||
391 | if (!delayed_work_pending(&devfreq->work) && | |
392 | devfreq->profile->polling_ms) | |
393 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
394 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
395 | |
396 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
397 | devfreq->stop_polling = false; |
398 | ||
39688ce6 RV |
399 | if (devfreq->profile->get_cur_freq && |
400 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
401 | devfreq->previous_freq = freq; | |
402 | ||
7e6fdd4b RV |
403 | out: |
404 | mutex_unlock(&devfreq->lock); | |
405 | } | |
6dcdd8e3 | 406 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
407 | |
408 | /** | |
409 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
410 | * @devfreq: the devfreq instance. | |
411 | * @delay: new polling interval to be set. | |
412 | * | |
413 | * Helper function to set new load monitoring polling interval. Function | |
414 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
415 | */ | |
416 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
417 | { | |
418 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
419 | unsigned int new_delay = *delay; | |
420 | ||
421 | mutex_lock(&devfreq->lock); | |
422 | devfreq->profile->polling_ms = new_delay; | |
423 | ||
424 | if (devfreq->stop_polling) | |
425 | goto out; | |
426 | ||
427 | /* if new delay is zero, stop polling */ | |
428 | if (!new_delay) { | |
429 | mutex_unlock(&devfreq->lock); | |
430 | cancel_delayed_work_sync(&devfreq->work); | |
431 | return; | |
432 | } | |
433 | ||
434 | /* if current delay is zero, start polling with new delay */ | |
435 | if (!cur_delay) { | |
436 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
437 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
438 | goto out; | |
439 | } | |
440 | ||
441 | /* if current delay is greater than new delay, restart polling */ | |
442 | if (cur_delay > new_delay) { | |
443 | mutex_unlock(&devfreq->lock); | |
444 | cancel_delayed_work_sync(&devfreq->work); | |
445 | mutex_lock(&devfreq->lock); | |
446 | if (!devfreq->stop_polling) | |
447 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
448 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
449 | } | |
450 | out: | |
451 | mutex_unlock(&devfreq->lock); | |
452 | } | |
6dcdd8e3 | 453 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
454 | |
455 | /** | |
456 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
457 | * has been changed out of devfreq framework. | |
c5b4a1c1 NM |
458 | * @nb: the notifier_block (supposed to be devfreq->nb) |
459 | * @type: not used | |
460 | * @devp: not used | |
a3c98b8b MH |
461 | * |
462 | * Called by a notifier that uses devfreq->nb. | |
463 | */ | |
464 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
465 | void *devp) | |
466 | { | |
467 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
468 | int ret; | |
469 | ||
470 | mutex_lock(&devfreq->lock); | |
471 | ret = update_devfreq(devfreq); | |
472 | mutex_unlock(&devfreq->lock); | |
473 | ||
474 | return ret; | |
475 | } | |
476 | ||
477 | /** | |
7e6fdd4b | 478 | * _remove_devfreq() - Remove devfreq from the list and release its resources. |
a3c98b8b | 479 | * @devfreq: the devfreq struct |
a3c98b8b | 480 | */ |
585fc83e | 481 | static void _remove_devfreq(struct devfreq *devfreq) |
a3c98b8b | 482 | { |
7e6fdd4b RV |
483 | mutex_lock(&devfreq_list_lock); |
484 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
485 | mutex_unlock(&devfreq_list_lock); | |
486 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
487 | return; |
488 | } | |
7e6fdd4b RV |
489 | list_del(&devfreq->node); |
490 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 491 | |
1b5c1be2 NM |
492 | if (devfreq->governor) |
493 | devfreq->governor->event_handler(devfreq, | |
494 | DEVFREQ_GOV_STOP, NULL); | |
a3c98b8b MH |
495 | |
496 | if (devfreq->profile->exit) | |
497 | devfreq->profile->exit(devfreq->dev.parent); | |
498 | ||
a3c98b8b | 499 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
500 | kfree(devfreq); |
501 | } | |
502 | ||
503 | /** | |
504 | * devfreq_dev_release() - Callback for struct device to release the device. | |
505 | * @dev: the devfreq device | |
506 | * | |
507 | * This calls _remove_devfreq() if _remove_devfreq() is not called. | |
a3c98b8b MH |
508 | */ |
509 | static void devfreq_dev_release(struct device *dev) | |
510 | { | |
511 | struct devfreq *devfreq = to_devfreq(dev); | |
a3c98b8b | 512 | |
585fc83e | 513 | _remove_devfreq(devfreq); |
a3c98b8b MH |
514 | } |
515 | ||
516 | /** | |
517 | * devfreq_add_device() - Add devfreq feature to the device | |
518 | * @dev: the device to add devfreq feature. | |
519 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 520 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
521 | * @data: private data for the governor. The devfreq framework does not |
522 | * touch this value. | |
523 | */ | |
524 | struct devfreq *devfreq_add_device(struct device *dev, | |
525 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 526 | const char *governor_name, |
a3c98b8b MH |
527 | void *data) |
528 | { | |
529 | struct devfreq *devfreq; | |
1b5c1be2 | 530 | struct devfreq_governor *governor; |
a3c98b8b MH |
531 | int err = 0; |
532 | ||
1b5c1be2 | 533 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
534 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
535 | return ERR_PTR(-EINVAL); | |
536 | } | |
537 | ||
7e6fdd4b RV |
538 | mutex_lock(&devfreq_list_lock); |
539 | devfreq = find_device_devfreq(dev); | |
540 | mutex_unlock(&devfreq_list_lock); | |
541 | if (!IS_ERR(devfreq)) { | |
542 | dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__); | |
543 | err = -EINVAL; | |
544 | goto err_out; | |
a3c98b8b MH |
545 | } |
546 | ||
547 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
548 | if (!devfreq) { | |
549 | dev_err(dev, "%s: Unable to create devfreq for the device\n", | |
550 | __func__); | |
551 | err = -ENOMEM; | |
3f19f08a | 552 | goto err_out; |
a3c98b8b MH |
553 | } |
554 | ||
555 | mutex_init(&devfreq->lock); | |
556 | mutex_lock(&devfreq->lock); | |
557 | devfreq->dev.parent = dev; | |
558 | devfreq->dev.class = devfreq_class; | |
559 | devfreq->dev.release = devfreq_dev_release; | |
560 | devfreq->profile = profile; | |
1b5c1be2 | 561 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 562 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 563 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 564 | devfreq->data = data; |
a3c98b8b MH |
565 | devfreq->nb.notifier_call = devfreq_notifier_call; |
566 | ||
0ec09ac2 CC |
567 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
568 | mutex_unlock(&devfreq->lock); | |
569 | devfreq_set_freq_table(devfreq); | |
570 | mutex_lock(&devfreq->lock); | |
571 | } | |
572 | ||
02aa2a37 | 573 | dev_set_name(&devfreq->dev, "%s", dev_name(dev)); |
a3c98b8b MH |
574 | err = device_register(&devfreq->dev); |
575 | if (err) { | |
7e6fdd4b | 576 | mutex_unlock(&devfreq->lock); |
6d3cbfa7 | 577 | goto err_out; |
a3c98b8b MH |
578 | } |
579 | ||
3e1d7fb0 MH |
580 | devfreq->trans_table = devm_kzalloc(&devfreq->dev, sizeof(unsigned int) * |
581 | devfreq->profile->max_state * | |
582 | devfreq->profile->max_state, | |
583 | GFP_KERNEL); | |
584 | devfreq->time_in_state = devm_kzalloc(&devfreq->dev, sizeof(unsigned long) * | |
585 | devfreq->profile->max_state, | |
586 | GFP_KERNEL); | |
587 | devfreq->last_stat_updated = jiffies; | |
588 | ||
0fe3a664 CC |
589 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
590 | ||
a3c98b8b MH |
591 | mutex_unlock(&devfreq->lock); |
592 | ||
a3c98b8b | 593 | mutex_lock(&devfreq_list_lock); |
a3c98b8b MH |
594 | list_add(&devfreq->node, &devfreq_list); |
595 | ||
1b5c1be2 | 596 | governor = find_devfreq_governor(devfreq->governor_name); |
73613b16 CC |
597 | if (IS_ERR(governor)) { |
598 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
599 | __func__); | |
600 | err = PTR_ERR(governor); | |
601 | goto err_init; | |
602 | } | |
603 | ||
604 | devfreq->governor = governor; | |
605 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
606 | NULL); | |
7e6fdd4b RV |
607 | if (err) { |
608 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
609 | __func__); | |
610 | goto err_init; | |
a3c98b8b | 611 | } |
0f376c9c | 612 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 613 | |
3f19f08a AL |
614 | return devfreq; |
615 | ||
a3c98b8b | 616 | err_init: |
7e6fdd4b | 617 | list_del(&devfreq->node); |
0f376c9c AL |
618 | mutex_unlock(&devfreq_list_lock); |
619 | ||
a3c98b8b | 620 | device_unregister(&devfreq->dev); |
3f19f08a AL |
621 | err_out: |
622 | return ERR_PTR(err); | |
a3c98b8b | 623 | } |
7e6fdd4b | 624 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
625 | |
626 | /** | |
627 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 628 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
629 | * |
630 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
631 | */ |
632 | int devfreq_remove_device(struct devfreq *devfreq) | |
633 | { | |
634 | if (!devfreq) | |
635 | return -EINVAL; | |
636 | ||
585fc83e | 637 | device_unregister(&devfreq->dev); |
9f3bdd4f | 638 | |
a3c98b8b MH |
639 | return 0; |
640 | } | |
7e6fdd4b | 641 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 642 | |
8cd84092 CC |
643 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
644 | { | |
645 | struct devfreq **r = res; | |
646 | ||
647 | if (WARN_ON(!r || !*r)) | |
648 | return 0; | |
649 | ||
650 | return *r == data; | |
651 | } | |
652 | ||
653 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
654 | { | |
655 | devfreq_remove_device(*(struct devfreq **)res); | |
656 | } | |
657 | ||
658 | /** | |
659 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
660 | * @dev: the device to add devfreq feature. | |
661 | * @profile: device-specific profile to run devfreq. | |
662 | * @governor_name: name of the policy to choose frequency. | |
663 | * @data: private data for the governor. The devfreq framework does not | |
664 | * touch this value. | |
665 | * | |
666 | * This function manages automatically the memory of devfreq device using device | |
667 | * resource management and simplify the free operation for memory of devfreq | |
668 | * device. | |
669 | */ | |
670 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
671 | struct devfreq_dev_profile *profile, | |
672 | const char *governor_name, | |
673 | void *data) | |
674 | { | |
675 | struct devfreq **ptr, *devfreq; | |
676 | ||
677 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
678 | if (!ptr) | |
679 | return ERR_PTR(-ENOMEM); | |
680 | ||
681 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
682 | if (IS_ERR(devfreq)) { | |
683 | devres_free(ptr); | |
684 | return ERR_PTR(-ENOMEM); | |
685 | } | |
686 | ||
687 | *ptr = devfreq; | |
688 | devres_add(dev, ptr); | |
689 | ||
690 | return devfreq; | |
691 | } | |
692 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
693 | ||
8f510aeb CC |
694 | #ifdef CONFIG_OF |
695 | /* | |
696 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
697 | * @dev - instance to the given device | |
698 | * @index - index into list of devfreq | |
699 | * | |
700 | * return the instance of devfreq device | |
701 | */ | |
702 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
703 | { | |
704 | struct device_node *node; | |
705 | struct devfreq *devfreq; | |
706 | ||
707 | if (!dev) | |
708 | return ERR_PTR(-EINVAL); | |
709 | ||
710 | if (!dev->of_node) | |
711 | return ERR_PTR(-EINVAL); | |
712 | ||
713 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
714 | if (!node) | |
715 | return ERR_PTR(-ENODEV); | |
716 | ||
717 | mutex_lock(&devfreq_list_lock); | |
718 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
719 | if (devfreq->dev.parent | |
720 | && devfreq->dev.parent->of_node == node) { | |
721 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 722 | of_node_put(node); |
8f510aeb CC |
723 | return devfreq; |
724 | } | |
725 | } | |
726 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 727 | of_node_put(node); |
8f510aeb CC |
728 | |
729 | return ERR_PTR(-EPROBE_DEFER); | |
730 | } | |
731 | #else | |
732 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
733 | { | |
734 | return ERR_PTR(-ENODEV); | |
735 | } | |
736 | #endif /* CONFIG_OF */ | |
737 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
738 | ||
8cd84092 CC |
739 | /** |
740 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
741 | * @dev: the device to add devfreq feature. | |
742 | * @devfreq: the devfreq instance to be removed | |
743 | */ | |
744 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
745 | { | |
746 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
747 | devm_devfreq_dev_match, devfreq)); | |
748 | } | |
749 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
750 | ||
206c30cf RV |
751 | /** |
752 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
753 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
754 | * |
755 | * This function is intended to be called by the pm callbacks | |
756 | * (e.g., runtime_suspend, suspend) of the device driver that | |
757 | * holds the devfreq. | |
206c30cf RV |
758 | */ |
759 | int devfreq_suspend_device(struct devfreq *devfreq) | |
760 | { | |
a3c98b8b MH |
761 | if (!devfreq) |
762 | return -EINVAL; | |
763 | ||
1b5c1be2 NM |
764 | if (!devfreq->governor) |
765 | return 0; | |
766 | ||
206c30cf RV |
767 | return devfreq->governor->event_handler(devfreq, |
768 | DEVFREQ_GOV_SUSPEND, NULL); | |
769 | } | |
770 | EXPORT_SYMBOL(devfreq_suspend_device); | |
771 | ||
772 | /** | |
773 | * devfreq_resume_device() - Resume devfreq of a device. | |
774 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
775 | * |
776 | * This function is intended to be called by the pm callbacks | |
777 | * (e.g., runtime_resume, resume) of the device driver that | |
778 | * holds the devfreq. | |
206c30cf RV |
779 | */ |
780 | int devfreq_resume_device(struct devfreq *devfreq) | |
781 | { | |
782 | if (!devfreq) | |
783 | return -EINVAL; | |
784 | ||
1b5c1be2 NM |
785 | if (!devfreq->governor) |
786 | return 0; | |
787 | ||
206c30cf RV |
788 | return devfreq->governor->event_handler(devfreq, |
789 | DEVFREQ_GOV_RESUME, NULL); | |
790 | } | |
791 | EXPORT_SYMBOL(devfreq_resume_device); | |
792 | ||
3aa173b8 NM |
793 | /** |
794 | * devfreq_add_governor() - Add devfreq governor | |
795 | * @governor: the devfreq governor to be added | |
796 | */ | |
797 | int devfreq_add_governor(struct devfreq_governor *governor) | |
798 | { | |
799 | struct devfreq_governor *g; | |
1b5c1be2 | 800 | struct devfreq *devfreq; |
3aa173b8 NM |
801 | int err = 0; |
802 | ||
803 | if (!governor) { | |
804 | pr_err("%s: Invalid parameters.\n", __func__); | |
805 | return -EINVAL; | |
806 | } | |
807 | ||
808 | mutex_lock(&devfreq_list_lock); | |
809 | g = find_devfreq_governor(governor->name); | |
810 | if (!IS_ERR(g)) { | |
811 | pr_err("%s: governor %s already registered\n", __func__, | |
812 | g->name); | |
813 | err = -EINVAL; | |
814 | goto err_out; | |
815 | } | |
9f3bdd4f | 816 | |
3aa173b8 NM |
817 | list_add(&governor->node, &devfreq_governor_list); |
818 | ||
1b5c1be2 NM |
819 | list_for_each_entry(devfreq, &devfreq_list, node) { |
820 | int ret = 0; | |
821 | struct device *dev = devfreq->dev.parent; | |
822 | ||
823 | if (!strncmp(devfreq->governor_name, governor->name, | |
824 | DEVFREQ_NAME_LEN)) { | |
825 | /* The following should never occur */ | |
826 | if (devfreq->governor) { | |
827 | dev_warn(dev, | |
828 | "%s: Governor %s already present\n", | |
829 | __func__, devfreq->governor->name); | |
830 | ret = devfreq->governor->event_handler(devfreq, | |
831 | DEVFREQ_GOV_STOP, NULL); | |
832 | if (ret) { | |
833 | dev_warn(dev, | |
834 | "%s: Governor %s stop = %d\n", | |
835 | __func__, | |
836 | devfreq->governor->name, ret); | |
837 | } | |
838 | /* Fall through */ | |
839 | } | |
840 | devfreq->governor = governor; | |
841 | ret = devfreq->governor->event_handler(devfreq, | |
842 | DEVFREQ_GOV_START, NULL); | |
843 | if (ret) { | |
844 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
845 | __func__, devfreq->governor->name, | |
846 | ret); | |
847 | } | |
a3c98b8b MH |
848 | } |
849 | } | |
850 | ||
3aa173b8 NM |
851 | err_out: |
852 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 853 | |
3aa173b8 NM |
854 | return err; |
855 | } | |
856 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 857 | |
3aa173b8 | 858 | /** |
bafeb42b | 859 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
860 | * @governor: the devfreq governor to be removed |
861 | */ | |
862 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
863 | { | |
864 | struct devfreq_governor *g; | |
1b5c1be2 | 865 | struct devfreq *devfreq; |
3aa173b8 NM |
866 | int err = 0; |
867 | ||
868 | if (!governor) { | |
869 | pr_err("%s: Invalid parameters.\n", __func__); | |
870 | return -EINVAL; | |
871 | } | |
872 | ||
873 | mutex_lock(&devfreq_list_lock); | |
874 | g = find_devfreq_governor(governor->name); | |
875 | if (IS_ERR(g)) { | |
876 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 877 | governor->name); |
f9c08e2a | 878 | err = PTR_ERR(g); |
3aa173b8 NM |
879 | goto err_out; |
880 | } | |
1b5c1be2 NM |
881 | list_for_each_entry(devfreq, &devfreq_list, node) { |
882 | int ret; | |
883 | struct device *dev = devfreq->dev.parent; | |
884 | ||
885 | if (!strncmp(devfreq->governor_name, governor->name, | |
886 | DEVFREQ_NAME_LEN)) { | |
887 | /* we should have a devfreq governor! */ | |
888 | if (!devfreq->governor) { | |
889 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
890 | __func__, governor->name); | |
891 | continue; | |
892 | /* Fall through */ | |
893 | } | |
894 | ret = devfreq->governor->event_handler(devfreq, | |
895 | DEVFREQ_GOV_STOP, NULL); | |
896 | if (ret) { | |
897 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
898 | __func__, devfreq->governor->name, | |
899 | ret); | |
900 | } | |
901 | devfreq->governor = NULL; | |
902 | } | |
903 | } | |
3aa173b8 NM |
904 | |
905 | list_del(&governor->node); | |
906 | err_out: | |
907 | mutex_unlock(&devfreq_list_lock); | |
908 | ||
909 | return err; | |
a3c98b8b | 910 | } |
3aa173b8 | 911 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 912 | |
a93d6b0a | 913 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
914 | struct device_attribute *attr, char *buf) |
915 | { | |
1b5c1be2 NM |
916 | if (!to_devfreq(dev)->governor) |
917 | return -EINVAL; | |
918 | ||
9005b650 MH |
919 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
920 | } | |
921 | ||
a93d6b0a | 922 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
923 | const char *buf, size_t count) |
924 | { | |
925 | struct devfreq *df = to_devfreq(dev); | |
926 | int ret; | |
927 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
928 | struct devfreq_governor *governor; | |
929 | ||
930 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
931 | if (ret != 1) | |
932 | return -EINVAL; | |
933 | ||
934 | mutex_lock(&devfreq_list_lock); | |
935 | governor = find_devfreq_governor(str_governor); | |
936 | if (IS_ERR(governor)) { | |
937 | ret = PTR_ERR(governor); | |
938 | goto out; | |
939 | } | |
14a21e7b TJ |
940 | if (df->governor == governor) { |
941 | ret = 0; | |
0359d1af | 942 | goto out; |
71ff24f5 CC |
943 | } else if (df->governor->immutable || governor->immutable) { |
944 | ret = -EINVAL; | |
945 | goto out; | |
14a21e7b | 946 | } |
0359d1af NM |
947 | |
948 | if (df->governor) { | |
949 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
950 | if (ret) { | |
951 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
952 | __func__, df->governor->name, ret); | |
953 | goto out; | |
954 | } | |
955 | } | |
956 | df->governor = governor; | |
957 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
958 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
959 | if (ret) | |
960 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
961 | __func__, df->governor->name, ret); | |
962 | out: | |
963 | mutex_unlock(&devfreq_list_lock); | |
964 | ||
965 | if (!ret) | |
966 | ret = count; | |
967 | return ret; | |
968 | } | |
a93d6b0a GKH |
969 | static DEVICE_ATTR_RW(governor); |
970 | ||
971 | static ssize_t available_governors_show(struct device *d, | |
972 | struct device_attribute *attr, | |
973 | char *buf) | |
50a5b33e | 974 | { |
71ff24f5 | 975 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
976 | ssize_t count = 0; |
977 | ||
978 | mutex_lock(&devfreq_list_lock); | |
71ff24f5 CC |
979 | |
980 | /* | |
981 | * The devfreq with immutable governor (e.g., passive) shows | |
982 | * only own governor. | |
983 | */ | |
984 | if (df->governor->immutable) { | |
985 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, | |
986 | "%s ", df->governor_name); | |
987 | /* | |
988 | * The devfreq device shows the registered governor except for | |
989 | * immutable governors such as passive governor . | |
990 | */ | |
991 | } else { | |
992 | struct devfreq_governor *governor; | |
993 | ||
994 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
995 | if (governor->immutable) | |
996 | continue; | |
997 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
998 | "%s ", governor->name); | |
999 | } | |
1000 | } | |
1001 | ||
50a5b33e NM |
1002 | mutex_unlock(&devfreq_list_lock); |
1003 | ||
1004 | /* Truncate the trailing space */ | |
1005 | if (count) | |
1006 | count--; | |
1007 | ||
1008 | count += sprintf(&buf[count], "\n"); | |
1009 | ||
1010 | return count; | |
1011 | } | |
a93d6b0a | 1012 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1013 | |
a93d6b0a GKH |
1014 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1015 | char *buf) | |
7f98a905 RV |
1016 | { |
1017 | unsigned long freq; | |
1018 | struct devfreq *devfreq = to_devfreq(dev); | |
1019 | ||
1020 | if (devfreq->profile->get_cur_freq && | |
1021 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
1022 | return sprintf(buf, "%lu\n", freq); | |
1023 | ||
1024 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1025 | } | |
a93d6b0a | 1026 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1027 | |
a93d6b0a GKH |
1028 | static ssize_t target_freq_show(struct device *dev, |
1029 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1030 | { |
1031 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1032 | } | |
a93d6b0a | 1033 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1034 | |
a93d6b0a | 1035 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1036 | struct device_attribute *attr, char *buf) |
1037 | { | |
1038 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1039 | } | |
1040 | ||
a93d6b0a | 1041 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1042 | struct device_attribute *attr, |
1043 | const char *buf, size_t count) | |
1044 | { | |
1045 | struct devfreq *df = to_devfreq(dev); | |
1046 | unsigned int value; | |
1047 | int ret; | |
1048 | ||
1b5c1be2 NM |
1049 | if (!df->governor) |
1050 | return -EINVAL; | |
1051 | ||
9005b650 MH |
1052 | ret = sscanf(buf, "%u", &value); |
1053 | if (ret != 1) | |
12e26265 | 1054 | return -EINVAL; |
9005b650 | 1055 | |
7e6fdd4b | 1056 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
1057 | ret = count; |
1058 | ||
9005b650 MH |
1059 | return ret; |
1060 | } | |
a93d6b0a | 1061 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1062 | |
a93d6b0a | 1063 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1064 | const char *buf, size_t count) |
1065 | { | |
1066 | struct devfreq *df = to_devfreq(dev); | |
1067 | unsigned long value; | |
1068 | int ret; | |
1069 | unsigned long max; | |
1070 | ||
1071 | ret = sscanf(buf, "%lu", &value); | |
1072 | if (ret != 1) | |
12e26265 | 1073 | return -EINVAL; |
6530b9de MH |
1074 | |
1075 | mutex_lock(&df->lock); | |
1076 | max = df->max_freq; | |
1077 | if (value && max && value > max) { | |
1078 | ret = -EINVAL; | |
1079 | goto unlock; | |
1080 | } | |
1081 | ||
1082 | df->min_freq = value; | |
1083 | update_devfreq(df); | |
1084 | ret = count; | |
1085 | unlock: | |
1086 | mutex_unlock(&df->lock); | |
6530b9de MH |
1087 | return ret; |
1088 | } | |
1089 | ||
a93d6b0a | 1090 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1091 | const char *buf, size_t count) |
1092 | { | |
1093 | struct devfreq *df = to_devfreq(dev); | |
1094 | unsigned long value; | |
1095 | int ret; | |
1096 | unsigned long min; | |
1097 | ||
1098 | ret = sscanf(buf, "%lu", &value); | |
1099 | if (ret != 1) | |
12e26265 | 1100 | return -EINVAL; |
6530b9de MH |
1101 | |
1102 | mutex_lock(&df->lock); | |
1103 | min = df->min_freq; | |
1104 | if (value && min && value < min) { | |
1105 | ret = -EINVAL; | |
1106 | goto unlock; | |
1107 | } | |
1108 | ||
1109 | df->max_freq = value; | |
1110 | update_devfreq(df); | |
1111 | ret = count; | |
1112 | unlock: | |
1113 | mutex_unlock(&df->lock); | |
6530b9de MH |
1114 | return ret; |
1115 | } | |
1116 | ||
3104fa30 CC |
1117 | #define show_one(name) \ |
1118 | static ssize_t name##_show \ | |
1119 | (struct device *dev, struct device_attribute *attr, char *buf) \ | |
1120 | { \ | |
1121 | return sprintf(buf, "%lu\n", to_devfreq(dev)->name); \ | |
6530b9de | 1122 | } |
3104fa30 CC |
1123 | show_one(min_freq); |
1124 | show_one(max_freq); | |
1125 | ||
1126 | static DEVICE_ATTR_RW(min_freq); | |
a93d6b0a | 1127 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1128 | |
a93d6b0a GKH |
1129 | static ssize_t available_frequencies_show(struct device *d, |
1130 | struct device_attribute *attr, | |
1131 | char *buf) | |
d287de85 NM |
1132 | { |
1133 | struct devfreq *df = to_devfreq(d); | |
1134 | struct device *dev = df->dev.parent; | |
47d43ba7 | 1135 | struct dev_pm_opp *opp; |
d287de85 NM |
1136 | ssize_t count = 0; |
1137 | unsigned long freq = 0; | |
1138 | ||
1139 | rcu_read_lock(); | |
1140 | do { | |
5d4879cd | 1141 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); |
d287de85 NM |
1142 | if (IS_ERR(opp)) |
1143 | break; | |
1144 | ||
1145 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1146 | "%lu ", freq); | |
1147 | freq++; | |
1148 | } while (1); | |
1149 | rcu_read_unlock(); | |
1150 | ||
1151 | /* Truncate the trailing space */ | |
1152 | if (count) | |
1153 | count--; | |
1154 | ||
1155 | count += sprintf(&buf[count], "\n"); | |
1156 | ||
1157 | return count; | |
1158 | } | |
a93d6b0a | 1159 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1160 | |
a93d6b0a GKH |
1161 | static ssize_t trans_stat_show(struct device *dev, |
1162 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1163 | { |
1164 | struct devfreq *devfreq = to_devfreq(dev); | |
1165 | ssize_t len; | |
39688ce6 | 1166 | int i, j; |
e552bbaf JL |
1167 | unsigned int max_state = devfreq->profile->max_state; |
1168 | ||
39688ce6 RV |
1169 | if (!devfreq->stop_polling && |
1170 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1171 | return 0; |
34bd3220 MH |
1172 | if (max_state == 0) |
1173 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1174 | |
d7df1e46 CC |
1175 | len = sprintf(buf, " From : To\n"); |
1176 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1177 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1178 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1179 | devfreq->profile->freq_table[i]); |
1180 | ||
1181 | len += sprintf(buf + len, " time(ms)\n"); | |
1182 | ||
1183 | for (i = 0; i < max_state; i++) { | |
1184 | if (devfreq->profile->freq_table[i] | |
1185 | == devfreq->previous_freq) { | |
1186 | len += sprintf(buf + len, "*"); | |
1187 | } else { | |
1188 | len += sprintf(buf + len, " "); | |
1189 | } | |
d7df1e46 | 1190 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1191 | devfreq->profile->freq_table[i]); |
1192 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1193 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1194 | devfreq->trans_table[(i * max_state) + j]); |
1195 | len += sprintf(buf + len, "%10u\n", | |
1196 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1197 | } | |
1198 | ||
1199 | len += sprintf(buf + len, "Total transition : %u\n", | |
1200 | devfreq->total_trans); | |
1201 | return len; | |
1202 | } | |
a93d6b0a GKH |
1203 | static DEVICE_ATTR_RO(trans_stat); |
1204 | ||
1205 | static struct attribute *devfreq_attrs[] = { | |
1206 | &dev_attr_governor.attr, | |
1207 | &dev_attr_available_governors.attr, | |
1208 | &dev_attr_cur_freq.attr, | |
1209 | &dev_attr_available_frequencies.attr, | |
1210 | &dev_attr_target_freq.attr, | |
1211 | &dev_attr_polling_interval.attr, | |
1212 | &dev_attr_min_freq.attr, | |
1213 | &dev_attr_max_freq.attr, | |
1214 | &dev_attr_trans_stat.attr, | |
1215 | NULL, | |
9005b650 | 1216 | }; |
a93d6b0a | 1217 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1218 | |
a3c98b8b MH |
1219 | static int __init devfreq_init(void) |
1220 | { | |
1221 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1222 | if (IS_ERR(devfreq_class)) { | |
1223 | pr_err("%s: couldn't create class\n", __FILE__); | |
1224 | return PTR_ERR(devfreq_class); | |
1225 | } | |
7e6fdd4b RV |
1226 | |
1227 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1228 | if (!devfreq_wq) { |
7e6fdd4b RV |
1229 | class_destroy(devfreq_class); |
1230 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1231 | return -ENOMEM; |
7e6fdd4b | 1232 | } |
a93d6b0a | 1233 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1234 | |
a3c98b8b MH |
1235 | return 0; |
1236 | } | |
1237 | subsys_initcall(devfreq_init); | |
1238 | ||
a3c98b8b MH |
1239 | /* |
1240 | * The followings are helper functions for devfreq user device drivers with | |
1241 | * OPP framework. | |
1242 | */ | |
1243 | ||
1244 | /** | |
1245 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1246 | * freq value given to target callback. | |
c5b4a1c1 NM |
1247 | * @dev: The devfreq user device. (parent of devfreq) |
1248 | * @freq: The frequency given to target function | |
1249 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1250 | * |
bcb27549 NM |
1251 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu |
1252 | * protected pointer. The reason for the same is that the opp pointer which is | |
1253 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
1254 | * under the locked area. The pointer returned must be used prior to unlocking | |
1255 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
a3c98b8b | 1256 | */ |
47d43ba7 NM |
1257 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1258 | unsigned long *freq, | |
1259 | u32 flags) | |
a3c98b8b | 1260 | { |
47d43ba7 | 1261 | struct dev_pm_opp *opp; |
a3c98b8b | 1262 | |
ab5f299f MH |
1263 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1264 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1265 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1266 | |
1267 | /* If not available, use the closest opp */ | |
0779726c | 1268 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1269 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1270 | } else { |
1271 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1272 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1273 | |
1274 | /* If not available, use the closest opp */ | |
0779726c | 1275 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1276 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1277 | } |
1278 | ||
a3c98b8b MH |
1279 | return opp; |
1280 | } | |
bd7e9277 | 1281 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1282 | |
1283 | /** | |
1284 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
1285 | * for any changes in the OPP availability | |
1286 | * changes | |
c5b4a1c1 NM |
1287 | * @dev: The devfreq user device. (parent of devfreq) |
1288 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1289 | */ |
1290 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1291 | { | |
389baed0 MH |
1292 | struct srcu_notifier_head *nh; |
1293 | int ret = 0; | |
a3c98b8b | 1294 | |
389baed0 | 1295 | rcu_read_lock(); |
5d4879cd | 1296 | nh = dev_pm_opp_get_notifier(dev); |
a3c98b8b | 1297 | if (IS_ERR(nh)) |
389baed0 MH |
1298 | ret = PTR_ERR(nh); |
1299 | rcu_read_unlock(); | |
1300 | if (!ret) | |
1301 | ret = srcu_notifier_chain_register(nh, &devfreq->nb); | |
1302 | ||
1303 | return ret; | |
a3c98b8b | 1304 | } |
bd7e9277 | 1305 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1306 | |
1307 | /** | |
1308 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
1309 | * notified for any changes in the OPP | |
1310 | * availability changes anymore. | |
c5b4a1c1 NM |
1311 | * @dev: The devfreq user device. (parent of devfreq) |
1312 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1313 | * |
1314 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1315 | * devfreq_recommended_opp is used. | |
1316 | */ | |
1317 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1318 | { | |
389baed0 MH |
1319 | struct srcu_notifier_head *nh; |
1320 | int ret = 0; | |
a3c98b8b | 1321 | |
389baed0 | 1322 | rcu_read_lock(); |
5d4879cd | 1323 | nh = dev_pm_opp_get_notifier(dev); |
a3c98b8b | 1324 | if (IS_ERR(nh)) |
389baed0 MH |
1325 | ret = PTR_ERR(nh); |
1326 | rcu_read_unlock(); | |
1327 | if (!ret) | |
1328 | ret = srcu_notifier_chain_unregister(nh, &devfreq->nb); | |
1329 | ||
1330 | return ret; | |
a3c98b8b | 1331 | } |
bd7e9277 | 1332 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1333 | |
d5b040d0 CC |
1334 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1335 | { | |
1336 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1337 | } | |
1338 | ||
1339 | /** | |
1340 | * devm_ devfreq_register_opp_notifier() | |
1341 | * - Resource-managed devfreq_register_opp_notifier() | |
1342 | * @dev: The devfreq user device. (parent of devfreq) | |
1343 | * @devfreq: The devfreq object. | |
1344 | */ | |
1345 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1346 | struct devfreq *devfreq) | |
1347 | { | |
1348 | struct devfreq **ptr; | |
1349 | int ret; | |
1350 | ||
1351 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1352 | if (!ptr) | |
1353 | return -ENOMEM; | |
1354 | ||
1355 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1356 | if (ret) { | |
1357 | devres_free(ptr); | |
1358 | return ret; | |
1359 | } | |
1360 | ||
1361 | *ptr = devfreq; | |
1362 | devres_add(dev, ptr); | |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1367 | ||
1368 | /** | |
1369 | * devm_devfreq_unregister_opp_notifier() | |
1370 | * - Resource-managed devfreq_unregister_opp_notifier() | |
1371 | * @dev: The devfreq user device. (parent of devfreq) | |
1372 | * @devfreq: The devfreq object. | |
1373 | */ | |
1374 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1375 | struct devfreq *devfreq) | |
1376 | { | |
1377 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1378 | devm_devfreq_dev_match, devfreq)); | |
1379 | } | |
1380 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1381 | ||
0fe3a664 CC |
1382 | /** |
1383 | * devfreq_register_notifier() - Register a driver with devfreq | |
1384 | * @devfreq: The devfreq object. | |
1385 | * @nb: The notifier block to register. | |
1386 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1387 | */ | |
1388 | int devfreq_register_notifier(struct devfreq *devfreq, | |
1389 | struct notifier_block *nb, | |
1390 | unsigned int list) | |
1391 | { | |
1392 | int ret = 0; | |
1393 | ||
1394 | if (!devfreq) | |
1395 | return -EINVAL; | |
1396 | ||
1397 | switch (list) { | |
1398 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1399 | ret = srcu_notifier_chain_register( | |
1400 | &devfreq->transition_notifier_list, nb); | |
1401 | break; | |
1402 | default: | |
1403 | ret = -EINVAL; | |
1404 | } | |
1405 | ||
1406 | return ret; | |
1407 | } | |
1408 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1409 | ||
1410 | /* | |
1411 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1412 | * @devfreq: The devfreq object. | |
1413 | * @nb: The notifier block to be unregistered. | |
1414 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1415 | */ | |
1416 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1417 | struct notifier_block *nb, | |
1418 | unsigned int list) | |
1419 | { | |
1420 | int ret = 0; | |
1421 | ||
1422 | if (!devfreq) | |
1423 | return -EINVAL; | |
1424 | ||
1425 | switch (list) { | |
1426 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1427 | ret = srcu_notifier_chain_unregister( | |
1428 | &devfreq->transition_notifier_list, nb); | |
1429 | break; | |
1430 | default: | |
1431 | ret = -EINVAL; | |
1432 | } | |
1433 | ||
1434 | return ret; | |
1435 | } | |
1436 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1437 | ||
1438 | struct devfreq_notifier_devres { | |
1439 | struct devfreq *devfreq; | |
1440 | struct notifier_block *nb; | |
1441 | unsigned int list; | |
1442 | }; | |
1443 | ||
1444 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1445 | { | |
1446 | struct devfreq_notifier_devres *this = res; | |
1447 | ||
1448 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1449 | } | |
1450 | ||
1451 | /** | |
1452 | * devm_devfreq_register_notifier() | |
1453 | - Resource-managed devfreq_register_notifier() | |
1454 | * @dev: The devfreq user device. (parent of devfreq) | |
1455 | * @devfreq: The devfreq object. | |
1456 | * @nb: The notifier block to be unregistered. | |
1457 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1458 | */ | |
1459 | int devm_devfreq_register_notifier(struct device *dev, | |
1460 | struct devfreq *devfreq, | |
1461 | struct notifier_block *nb, | |
1462 | unsigned int list) | |
1463 | { | |
1464 | struct devfreq_notifier_devres *ptr; | |
1465 | int ret; | |
1466 | ||
1467 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1468 | GFP_KERNEL); | |
1469 | if (!ptr) | |
1470 | return -ENOMEM; | |
1471 | ||
1472 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1473 | if (ret) { | |
1474 | devres_free(ptr); | |
1475 | return ret; | |
1476 | } | |
1477 | ||
1478 | ptr->devfreq = devfreq; | |
1479 | ptr->nb = nb; | |
1480 | ptr->list = list; | |
1481 | devres_add(dev, ptr); | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1486 | ||
1487 | /** | |
1488 | * devm_devfreq_unregister_notifier() | |
1489 | - Resource-managed devfreq_unregister_notifier() | |
1490 | * @dev: The devfreq user device. (parent of devfreq) | |
1491 | * @devfreq: The devfreq object. | |
1492 | * @nb: The notifier block to be unregistered. | |
1493 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1494 | */ | |
1495 | void devm_devfreq_unregister_notifier(struct device *dev, | |
1496 | struct devfreq *devfreq, | |
1497 | struct notifier_block *nb, | |
1498 | unsigned int list) | |
1499 | { | |
1500 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1501 | devm_devfreq_dev_match, devfreq)); | |
1502 | } | |
1503 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |