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