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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 | ||
f1d981ea CC |
31 | #define MAX(a,b) ((a > b) ? a : b) |
32 | #define MIN(a,b) ((a < b) ? a : b) | |
33 | ||
1a1357ea | 34 | static struct class *devfreq_class; |
a3c98b8b MH |
35 | |
36 | /* | |
7e6fdd4b RV |
37 | * devfreq core provides delayed work based load monitoring helper |
38 | * functions. Governors can use these or can implement their own | |
39 | * monitoring mechanism. | |
a3c98b8b | 40 | */ |
a3c98b8b | 41 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 42 | |
3aa173b8 NM |
43 | /* The list of all device-devfreq governors */ |
44 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
45 | /* The list of all device-devfreq */ |
46 | static LIST_HEAD(devfreq_list); | |
47 | static DEFINE_MUTEX(devfreq_list_lock); | |
48 | ||
49 | /** | |
50 | * find_device_devfreq() - find devfreq struct using device pointer | |
51 | * @dev: device pointer used to lookup device devfreq. | |
52 | * | |
53 | * Search the list of device devfreqs and return the matched device's | |
54 | * devfreq info. devfreq_list_lock should be held by the caller. | |
55 | */ | |
56 | static struct devfreq *find_device_devfreq(struct device *dev) | |
57 | { | |
58 | struct devfreq *tmp_devfreq; | |
59 | ||
9348da2f | 60 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
61 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
62 | return ERR_PTR(-EINVAL); | |
63 | } | |
64 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
65 | "devfreq_list_lock must be locked."); | |
66 | ||
67 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
68 | if (tmp_devfreq->dev.parent == dev) | |
69 | return tmp_devfreq; | |
70 | } | |
71 | ||
72 | return ERR_PTR(-ENODEV); | |
73 | } | |
74 | ||
ab8f58ad CC |
75 | static unsigned long find_available_min_freq(struct devfreq *devfreq) |
76 | { | |
77 | struct dev_pm_opp *opp; | |
78 | unsigned long min_freq = 0; | |
79 | ||
80 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); | |
81 | if (IS_ERR(opp)) | |
82 | min_freq = 0; | |
83 | else | |
84 | dev_pm_opp_put(opp); | |
85 | ||
86 | return min_freq; | |
87 | } | |
88 | ||
89 | static unsigned long find_available_max_freq(struct devfreq *devfreq) | |
90 | { | |
91 | struct dev_pm_opp *opp; | |
92 | unsigned long max_freq = ULONG_MAX; | |
93 | ||
94 | opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); | |
95 | if (IS_ERR(opp)) | |
96 | max_freq = 0; | |
97 | else | |
98 | dev_pm_opp_put(opp); | |
99 | ||
100 | return max_freq; | |
101 | } | |
102 | ||
e552bbaf JL |
103 | /** |
104 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
105 | * @devfreq: the devfreq instance | |
106 | * @freq: the target frequency | |
107 | */ | |
108 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
109 | { | |
110 | int lev; | |
111 | ||
112 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
113 | if (freq == devfreq->profile->freq_table[lev]) | |
114 | return lev; | |
115 | ||
116 | return -EINVAL; | |
117 | } | |
118 | ||
0ec09ac2 CC |
119 | /** |
120 | * devfreq_set_freq_table() - Initialize freq_table for the frequency | |
121 | * @devfreq: the devfreq instance | |
122 | */ | |
123 | static void devfreq_set_freq_table(struct devfreq *devfreq) | |
124 | { | |
125 | struct devfreq_dev_profile *profile = devfreq->profile; | |
126 | struct dev_pm_opp *opp; | |
127 | unsigned long freq; | |
128 | int i, count; | |
129 | ||
130 | /* Initialize the freq_table from OPP table */ | |
131 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
132 | if (count <= 0) | |
133 | return; | |
134 | ||
135 | profile->max_state = count; | |
136 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
137 | profile->max_state, | |
138 | sizeof(*profile->freq_table), | |
139 | GFP_KERNEL); | |
140 | if (!profile->freq_table) { | |
141 | profile->max_state = 0; | |
142 | return; | |
143 | } | |
144 | ||
0ec09ac2 CC |
145 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { |
146 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
147 | if (IS_ERR(opp)) { | |
148 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
149 | profile->max_state = 0; | |
0ec09ac2 CC |
150 | return; |
151 | } | |
8a31d9d9 | 152 | dev_pm_opp_put(opp); |
0ec09ac2 CC |
153 | profile->freq_table[i] = freq; |
154 | } | |
0ec09ac2 CC |
155 | } |
156 | ||
e552bbaf JL |
157 | /** |
158 | * devfreq_update_status() - Update statistics of devfreq behavior | |
159 | * @devfreq: the devfreq instance | |
160 | * @freq: the update target frequency | |
161 | */ | |
30582c25 | 162 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 163 | { |
e35d35a1 | 164 | int lev, prev_lev, ret = 0; |
e552bbaf JL |
165 | unsigned long cur_time; |
166 | ||
e552bbaf | 167 | cur_time = jiffies; |
e35d35a1 | 168 | |
d0563a03 TJ |
169 | /* Immediately exit if previous_freq is not initialized yet. */ |
170 | if (!devfreq->previous_freq) | |
171 | goto out; | |
172 | ||
e35d35a1 SK |
173 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
174 | if (prev_lev < 0) { | |
175 | ret = prev_lev; | |
176 | goto out; | |
177 | } | |
178 | ||
179 | devfreq->time_in_state[prev_lev] += | |
e552bbaf | 180 | cur_time - devfreq->last_stat_updated; |
e35d35a1 SK |
181 | |
182 | lev = devfreq_get_freq_level(devfreq, freq); | |
183 | if (lev < 0) { | |
184 | ret = lev; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | if (lev != prev_lev) { | |
e552bbaf JL |
189 | devfreq->trans_table[(prev_lev * |
190 | devfreq->profile->max_state) + lev]++; | |
191 | devfreq->total_trans++; | |
192 | } | |
e552bbaf | 193 | |
e35d35a1 SK |
194 | out: |
195 | devfreq->last_stat_updated = cur_time; | |
196 | return ret; | |
e552bbaf | 197 | } |
30582c25 | 198 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 199 | |
3aa173b8 NM |
200 | /** |
201 | * find_devfreq_governor() - find devfreq governor from name | |
202 | * @name: name of the governor | |
203 | * | |
204 | * Search the list of devfreq governors and return the matched | |
205 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
206 | */ | |
207 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
208 | { | |
209 | struct devfreq_governor *tmp_governor; | |
210 | ||
9348da2f | 211 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
212 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
213 | return ERR_PTR(-EINVAL); | |
214 | } | |
215 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
216 | "devfreq_list_lock must be locked."); | |
217 | ||
218 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
219 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
220 | return tmp_governor; | |
221 | } | |
222 | ||
223 | return ERR_PTR(-ENODEV); | |
224 | } | |
225 | ||
0fe3a664 CC |
226 | static int devfreq_notify_transition(struct devfreq *devfreq, |
227 | struct devfreq_freqs *freqs, unsigned int state) | |
228 | { | |
229 | if (!devfreq) | |
230 | return -EINVAL; | |
231 | ||
232 | switch (state) { | |
233 | case DEVFREQ_PRECHANGE: | |
234 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
235 | DEVFREQ_PRECHANGE, freqs); | |
236 | break; | |
237 | ||
238 | case DEVFREQ_POSTCHANGE: | |
239 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
240 | DEVFREQ_POSTCHANGE, freqs); | |
241 | break; | |
242 | default: | |
243 | return -EINVAL; | |
244 | } | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
7e6fdd4b RV |
249 | /* Load monitoring helper functions for governors use */ |
250 | ||
a3c98b8b MH |
251 | /** |
252 | * update_devfreq() - Reevaluate the device and configure frequency. | |
253 | * @devfreq: the devfreq instance. | |
254 | * | |
255 | * Note: Lock devfreq->lock before calling update_devfreq | |
256 | * This function is exported for governors. | |
257 | */ | |
258 | int update_devfreq(struct devfreq *devfreq) | |
259 | { | |
0fe3a664 | 260 | struct devfreq_freqs freqs; |
f1d981ea | 261 | unsigned long freq, cur_freq, min_freq, max_freq; |
a3c98b8b | 262 | int err = 0; |
ab5f299f | 263 | u32 flags = 0; |
a3c98b8b MH |
264 | |
265 | if (!mutex_is_locked(&devfreq->lock)) { | |
266 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
1b5c1be2 NM |
270 | if (!devfreq->governor) |
271 | return -EINVAL; | |
272 | ||
a3c98b8b MH |
273 | /* Reevaluate the proper frequency */ |
274 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
275 | if (err) | |
276 | return err; | |
277 | ||
ab5f299f | 278 | /* |
f1d981ea | 279 | * Adjust the frequency with user freq, QoS and available freq. |
ab5f299f | 280 | * |
d3b7e174 JM |
281 | * List from the highest priority |
282 | * max_freq | |
ab5f299f MH |
283 | * min_freq |
284 | */ | |
f1d981ea CC |
285 | max_freq = MIN(devfreq->scaling_max_freq, devfreq->max_freq); |
286 | min_freq = MAX(devfreq->scaling_min_freq, devfreq->min_freq); | |
ab5f299f | 287 | |
f1d981ea CC |
288 | if (min_freq && freq < min_freq) { |
289 | freq = min_freq; | |
ab5f299f MH |
290 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ |
291 | } | |
f1d981ea CC |
292 | if (max_freq && freq > max_freq) { |
293 | freq = max_freq; | |
ab5f299f MH |
294 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ |
295 | } | |
296 | ||
0fe3a664 CC |
297 | if (devfreq->profile->get_cur_freq) |
298 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
299 | else | |
300 | cur_freq = devfreq->previous_freq; | |
301 | ||
302 | freqs.old = cur_freq; | |
303 | freqs.new = freq; | |
304 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
305 | ||
ab5f299f | 306 | err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); |
0d37189e CC |
307 | if (err) { |
308 | freqs.new = cur_freq; | |
309 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
a3c98b8b | 310 | return err; |
0d37189e | 311 | } |
a3c98b8b | 312 | |
0fe3a664 CC |
313 | freqs.new = freq; |
314 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
315 | ||
e552bbaf JL |
316 | if (devfreq->profile->freq_table) |
317 | if (devfreq_update_status(devfreq, freq)) | |
318 | dev_err(&devfreq->dev, | |
319 | "Couldn't update frequency transition information.\n"); | |
320 | ||
a3c98b8b MH |
321 | devfreq->previous_freq = freq; |
322 | return err; | |
323 | } | |
2df5021f | 324 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 325 | |
7e6fdd4b RV |
326 | /** |
327 | * devfreq_monitor() - Periodically poll devfreq objects. | |
328 | * @work: the work struct used to run devfreq_monitor periodically. | |
329 | * | |
330 | */ | |
331 | static void devfreq_monitor(struct work_struct *work) | |
332 | { | |
333 | int err; | |
334 | struct devfreq *devfreq = container_of(work, | |
335 | struct devfreq, work.work); | |
336 | ||
337 | mutex_lock(&devfreq->lock); | |
338 | err = update_devfreq(devfreq); | |
339 | if (err) | |
340 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
341 | ||
342 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
343 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
344 | mutex_unlock(&devfreq->lock); | |
345 | } | |
346 | ||
347 | /** | |
348 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
349 | * @devfreq: the devfreq instance. | |
350 | * | |
351 | * Helper function for starting devfreq device load monitoing. By | |
352 | * default delayed work based monitoring is supported. Function | |
353 | * to be called from governor in response to DEVFREQ_GOV_START | |
354 | * event when device is added to devfreq framework. | |
355 | */ | |
356 | void devfreq_monitor_start(struct devfreq *devfreq) | |
357 | { | |
358 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
359 | if (devfreq->profile->polling_ms) | |
360 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
361 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
362 | } | |
6dcdd8e3 | 363 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
364 | |
365 | /** | |
366 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
367 | * @devfreq: the devfreq instance. | |
368 | * | |
369 | * Helper function to stop devfreq device load monitoing. Function | |
370 | * to be called from governor in response to DEVFREQ_GOV_STOP | |
371 | * event when device is removed from devfreq framework. | |
372 | */ | |
373 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
374 | { | |
375 | cancel_delayed_work_sync(&devfreq->work); | |
376 | } | |
6dcdd8e3 | 377 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
378 | |
379 | /** | |
380 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
381 | * @devfreq: the devfreq instance. | |
382 | * | |
383 | * Helper function to suspend devfreq device load monitoing. Function | |
384 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND | |
385 | * event or when polling interval is set to zero. | |
386 | * | |
387 | * Note: Though this function is same as devfreq_monitor_stop(), | |
388 | * intentionally kept separate to provide hooks for collecting | |
389 | * transition statistics. | |
390 | */ | |
391 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
392 | { | |
393 | mutex_lock(&devfreq->lock); | |
394 | if (devfreq->stop_polling) { | |
395 | mutex_unlock(&devfreq->lock); | |
396 | return; | |
397 | } | |
398 | ||
39688ce6 | 399 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
400 | devfreq->stop_polling = true; |
401 | mutex_unlock(&devfreq->lock); | |
402 | cancel_delayed_work_sync(&devfreq->work); | |
403 | } | |
6dcdd8e3 | 404 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
405 | |
406 | /** | |
407 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
408 | * @devfreq: the devfreq instance. | |
409 | * | |
410 | * Helper function to resume devfreq device load monitoing. Function | |
411 | * to be called from governor in response to DEVFREQ_GOV_RESUME | |
412 | * event or when polling interval is set to non-zero. | |
413 | */ | |
414 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
415 | { | |
39688ce6 RV |
416 | unsigned long freq; |
417 | ||
7e6fdd4b RV |
418 | mutex_lock(&devfreq->lock); |
419 | if (!devfreq->stop_polling) | |
420 | goto out; | |
421 | ||
422 | if (!delayed_work_pending(&devfreq->work) && | |
423 | devfreq->profile->polling_ms) | |
424 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
425 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
426 | |
427 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
428 | devfreq->stop_polling = false; |
429 | ||
39688ce6 RV |
430 | if (devfreq->profile->get_cur_freq && |
431 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
432 | devfreq->previous_freq = freq; | |
433 | ||
7e6fdd4b RV |
434 | out: |
435 | mutex_unlock(&devfreq->lock); | |
436 | } | |
6dcdd8e3 | 437 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
438 | |
439 | /** | |
440 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
441 | * @devfreq: the devfreq instance. | |
442 | * @delay: new polling interval to be set. | |
443 | * | |
444 | * Helper function to set new load monitoring polling interval. Function | |
445 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
446 | */ | |
447 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
448 | { | |
449 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
450 | unsigned int new_delay = *delay; | |
451 | ||
452 | mutex_lock(&devfreq->lock); | |
453 | devfreq->profile->polling_ms = new_delay; | |
454 | ||
455 | if (devfreq->stop_polling) | |
456 | goto out; | |
457 | ||
458 | /* if new delay is zero, stop polling */ | |
459 | if (!new_delay) { | |
460 | mutex_unlock(&devfreq->lock); | |
461 | cancel_delayed_work_sync(&devfreq->work); | |
462 | return; | |
463 | } | |
464 | ||
465 | /* if current delay is zero, start polling with new delay */ | |
466 | if (!cur_delay) { | |
467 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
468 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
469 | goto out; | |
470 | } | |
471 | ||
472 | /* if current delay is greater than new delay, restart polling */ | |
473 | if (cur_delay > new_delay) { | |
474 | mutex_unlock(&devfreq->lock); | |
475 | cancel_delayed_work_sync(&devfreq->work); | |
476 | mutex_lock(&devfreq->lock); | |
477 | if (!devfreq->stop_polling) | |
478 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
479 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
480 | } | |
481 | out: | |
482 | mutex_unlock(&devfreq->lock); | |
483 | } | |
6dcdd8e3 | 484 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
485 | |
486 | /** | |
487 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
488 | * has been changed out of devfreq framework. | |
c5b4a1c1 NM |
489 | * @nb: the notifier_block (supposed to be devfreq->nb) |
490 | * @type: not used | |
491 | * @devp: not used | |
a3c98b8b MH |
492 | * |
493 | * Called by a notifier that uses devfreq->nb. | |
494 | */ | |
495 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
496 | void *devp) | |
497 | { | |
498 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
499 | int ret; | |
500 | ||
501 | mutex_lock(&devfreq->lock); | |
f1d981ea CC |
502 | |
503 | devfreq->scaling_min_freq = find_available_min_freq(devfreq); | |
504 | if (!devfreq->scaling_min_freq) { | |
505 | mutex_unlock(&devfreq->lock); | |
506 | return -EINVAL; | |
507 | } | |
508 | ||
509 | devfreq->scaling_max_freq = find_available_max_freq(devfreq); | |
510 | if (!devfreq->scaling_max_freq) { | |
511 | mutex_unlock(&devfreq->lock); | |
512 | return -EINVAL; | |
513 | } | |
514 | ||
a3c98b8b MH |
515 | ret = update_devfreq(devfreq); |
516 | mutex_unlock(&devfreq->lock); | |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
521 | /** | |
29b6968b CC |
522 | * devfreq_dev_release() - Callback for struct device to release the device. |
523 | * @dev: the devfreq device | |
524 | * | |
525 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 526 | */ |
29b6968b | 527 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 528 | { |
29b6968b CC |
529 | struct devfreq *devfreq = to_devfreq(dev); |
530 | ||
7e6fdd4b RV |
531 | mutex_lock(&devfreq_list_lock); |
532 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
533 | mutex_unlock(&devfreq_list_lock); | |
534 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
535 | return; |
536 | } | |
7e6fdd4b RV |
537 | list_del(&devfreq->node); |
538 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 539 | |
1b5c1be2 NM |
540 | if (devfreq->governor) |
541 | devfreq->governor->event_handler(devfreq, | |
542 | DEVFREQ_GOV_STOP, NULL); | |
a3c98b8b MH |
543 | |
544 | if (devfreq->profile->exit) | |
545 | devfreq->profile->exit(devfreq->dev.parent); | |
546 | ||
a3c98b8b | 547 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
548 | kfree(devfreq); |
549 | } | |
550 | ||
a3c98b8b MH |
551 | /** |
552 | * devfreq_add_device() - Add devfreq feature to the device | |
553 | * @dev: the device to add devfreq feature. | |
554 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 555 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
556 | * @data: private data for the governor. The devfreq framework does not |
557 | * touch this value. | |
558 | */ | |
559 | struct devfreq *devfreq_add_device(struct device *dev, | |
560 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 561 | const char *governor_name, |
a3c98b8b MH |
562 | void *data) |
563 | { | |
564 | struct devfreq *devfreq; | |
1b5c1be2 | 565 | struct devfreq_governor *governor; |
4585fbcb | 566 | static atomic_t devfreq_no = ATOMIC_INIT(-1); |
a3c98b8b MH |
567 | int err = 0; |
568 | ||
1b5c1be2 | 569 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
570 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
571 | return ERR_PTR(-EINVAL); | |
572 | } | |
573 | ||
7e6fdd4b RV |
574 | mutex_lock(&devfreq_list_lock); |
575 | devfreq = find_device_devfreq(dev); | |
576 | mutex_unlock(&devfreq_list_lock); | |
577 | if (!IS_ERR(devfreq)) { | |
9d0109be CC |
578 | dev_err(dev, "%s: Unable to create devfreq for the device.\n", |
579 | __func__); | |
7e6fdd4b RV |
580 | err = -EINVAL; |
581 | goto err_out; | |
a3c98b8b MH |
582 | } |
583 | ||
584 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
585 | if (!devfreq) { | |
a3c98b8b | 586 | err = -ENOMEM; |
3f19f08a | 587 | goto err_out; |
a3c98b8b MH |
588 | } |
589 | ||
590 | mutex_init(&devfreq->lock); | |
591 | mutex_lock(&devfreq->lock); | |
592 | devfreq->dev.parent = dev; | |
593 | devfreq->dev.class = devfreq_class; | |
594 | devfreq->dev.release = devfreq_dev_release; | |
595 | devfreq->profile = profile; | |
1b5c1be2 | 596 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 597 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 598 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 599 | devfreq->data = data; |
a3c98b8b MH |
600 | devfreq->nb.notifier_call = devfreq_notifier_call; |
601 | ||
0ec09ac2 CC |
602 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
603 | mutex_unlock(&devfreq->lock); | |
604 | devfreq_set_freq_table(devfreq); | |
605 | mutex_lock(&devfreq->lock); | |
606 | } | |
607 | ||
ab8f58ad CC |
608 | devfreq->min_freq = find_available_min_freq(devfreq); |
609 | if (!devfreq->min_freq) { | |
610 | mutex_unlock(&devfreq->lock); | |
611 | err = -EINVAL; | |
612 | goto err_dev; | |
613 | } | |
f1d981ea | 614 | devfreq->scaling_min_freq = devfreq->min_freq; |
ab8f58ad CC |
615 | |
616 | devfreq->max_freq = find_available_max_freq(devfreq); | |
617 | if (!devfreq->max_freq) { | |
618 | mutex_unlock(&devfreq->lock); | |
619 | err = -EINVAL; | |
620 | goto err_dev; | |
621 | } | |
f1d981ea | 622 | devfreq->scaling_max_freq = devfreq->max_freq; |
ab8f58ad | 623 | |
4585fbcb CC |
624 | dev_set_name(&devfreq->dev, "devfreq%d", |
625 | atomic_inc_return(&devfreq_no)); | |
a3c98b8b MH |
626 | err = device_register(&devfreq->dev); |
627 | if (err) { | |
7e6fdd4b | 628 | mutex_unlock(&devfreq->lock); |
9e14de10 | 629 | goto err_dev; |
a3c98b8b MH |
630 | } |
631 | ||
9d0109be CC |
632 | devfreq->trans_table = devm_kzalloc(&devfreq->dev, |
633 | sizeof(unsigned int) * | |
3e1d7fb0 MH |
634 | devfreq->profile->max_state * |
635 | devfreq->profile->max_state, | |
636 | GFP_KERNEL); | |
9d0109be CC |
637 | devfreq->time_in_state = devm_kzalloc(&devfreq->dev, |
638 | sizeof(unsigned long) * | |
3e1d7fb0 MH |
639 | devfreq->profile->max_state, |
640 | GFP_KERNEL); | |
641 | devfreq->last_stat_updated = jiffies; | |
642 | ||
0fe3a664 CC |
643 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
644 | ||
a3c98b8b MH |
645 | mutex_unlock(&devfreq->lock); |
646 | ||
a3c98b8b | 647 | mutex_lock(&devfreq_list_lock); |
a3c98b8b MH |
648 | list_add(&devfreq->node, &devfreq_list); |
649 | ||
1b5c1be2 | 650 | governor = find_devfreq_governor(devfreq->governor_name); |
73613b16 CC |
651 | if (IS_ERR(governor)) { |
652 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
653 | __func__); | |
654 | err = PTR_ERR(governor); | |
655 | goto err_init; | |
656 | } | |
657 | ||
658 | devfreq->governor = governor; | |
659 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
660 | NULL); | |
7e6fdd4b RV |
661 | if (err) { |
662 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
663 | __func__); | |
664 | goto err_init; | |
a3c98b8b | 665 | } |
0f376c9c | 666 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 667 | |
3f19f08a AL |
668 | return devfreq; |
669 | ||
a3c98b8b | 670 | err_init: |
7e6fdd4b | 671 | list_del(&devfreq->node); |
0f376c9c AL |
672 | mutex_unlock(&devfreq_list_lock); |
673 | ||
a3c98b8b | 674 | device_unregister(&devfreq->dev); |
9e14de10 CC |
675 | err_dev: |
676 | if (devfreq) | |
677 | kfree(devfreq); | |
3f19f08a AL |
678 | err_out: |
679 | return ERR_PTR(err); | |
a3c98b8b | 680 | } |
7e6fdd4b | 681 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
682 | |
683 | /** | |
684 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 685 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
686 | * |
687 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
688 | */ |
689 | int devfreq_remove_device(struct devfreq *devfreq) | |
690 | { | |
691 | if (!devfreq) | |
692 | return -EINVAL; | |
693 | ||
585fc83e | 694 | device_unregister(&devfreq->dev); |
9f3bdd4f | 695 | |
a3c98b8b MH |
696 | return 0; |
697 | } | |
7e6fdd4b | 698 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 699 | |
8cd84092 CC |
700 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
701 | { | |
702 | struct devfreq **r = res; | |
703 | ||
704 | if (WARN_ON(!r || !*r)) | |
705 | return 0; | |
706 | ||
707 | return *r == data; | |
708 | } | |
709 | ||
710 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
711 | { | |
712 | devfreq_remove_device(*(struct devfreq **)res); | |
713 | } | |
714 | ||
715 | /** | |
716 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
717 | * @dev: the device to add devfreq feature. | |
718 | * @profile: device-specific profile to run devfreq. | |
719 | * @governor_name: name of the policy to choose frequency. | |
720 | * @data: private data for the governor. The devfreq framework does not | |
721 | * touch this value. | |
722 | * | |
723 | * This function manages automatically the memory of devfreq device using device | |
724 | * resource management and simplify the free operation for memory of devfreq | |
725 | * device. | |
726 | */ | |
727 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
728 | struct devfreq_dev_profile *profile, | |
729 | const char *governor_name, | |
730 | void *data) | |
731 | { | |
732 | struct devfreq **ptr, *devfreq; | |
733 | ||
734 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
735 | if (!ptr) | |
736 | return ERR_PTR(-ENOMEM); | |
737 | ||
738 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
739 | if (IS_ERR(devfreq)) { | |
740 | devres_free(ptr); | |
741 | return ERR_PTR(-ENOMEM); | |
742 | } | |
743 | ||
744 | *ptr = devfreq; | |
745 | devres_add(dev, ptr); | |
746 | ||
747 | return devfreq; | |
748 | } | |
749 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
750 | ||
8f510aeb CC |
751 | #ifdef CONFIG_OF |
752 | /* | |
753 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
754 | * @dev - instance to the given device | |
755 | * @index - index into list of devfreq | |
756 | * | |
757 | * return the instance of devfreq device | |
758 | */ | |
759 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
760 | { | |
761 | struct device_node *node; | |
762 | struct devfreq *devfreq; | |
763 | ||
764 | if (!dev) | |
765 | return ERR_PTR(-EINVAL); | |
766 | ||
767 | if (!dev->of_node) | |
768 | return ERR_PTR(-EINVAL); | |
769 | ||
770 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
771 | if (!node) | |
772 | return ERR_PTR(-ENODEV); | |
773 | ||
774 | mutex_lock(&devfreq_list_lock); | |
775 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
776 | if (devfreq->dev.parent | |
777 | && devfreq->dev.parent->of_node == node) { | |
778 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 779 | of_node_put(node); |
8f510aeb CC |
780 | return devfreq; |
781 | } | |
782 | } | |
783 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 784 | of_node_put(node); |
8f510aeb CC |
785 | |
786 | return ERR_PTR(-EPROBE_DEFER); | |
787 | } | |
788 | #else | |
789 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
790 | { | |
791 | return ERR_PTR(-ENODEV); | |
792 | } | |
793 | #endif /* CONFIG_OF */ | |
794 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
795 | ||
8cd84092 CC |
796 | /** |
797 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
798 | * @dev: the device to add devfreq feature. | |
799 | * @devfreq: the devfreq instance to be removed | |
800 | */ | |
801 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
802 | { | |
803 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
804 | devm_devfreq_dev_match, devfreq)); | |
805 | } | |
806 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
807 | ||
206c30cf RV |
808 | /** |
809 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
810 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
811 | * |
812 | * This function is intended to be called by the pm callbacks | |
813 | * (e.g., runtime_suspend, suspend) of the device driver that | |
814 | * holds the devfreq. | |
206c30cf RV |
815 | */ |
816 | int devfreq_suspend_device(struct devfreq *devfreq) | |
817 | { | |
a3c98b8b MH |
818 | if (!devfreq) |
819 | return -EINVAL; | |
820 | ||
1b5c1be2 NM |
821 | if (!devfreq->governor) |
822 | return 0; | |
823 | ||
206c30cf RV |
824 | return devfreq->governor->event_handler(devfreq, |
825 | DEVFREQ_GOV_SUSPEND, NULL); | |
826 | } | |
827 | EXPORT_SYMBOL(devfreq_suspend_device); | |
828 | ||
829 | /** | |
830 | * devfreq_resume_device() - Resume devfreq of a device. | |
831 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
832 | * |
833 | * This function is intended to be called by the pm callbacks | |
834 | * (e.g., runtime_resume, resume) of the device driver that | |
835 | * holds the devfreq. | |
206c30cf RV |
836 | */ |
837 | int devfreq_resume_device(struct devfreq *devfreq) | |
838 | { | |
839 | if (!devfreq) | |
840 | return -EINVAL; | |
841 | ||
1b5c1be2 NM |
842 | if (!devfreq->governor) |
843 | return 0; | |
844 | ||
206c30cf RV |
845 | return devfreq->governor->event_handler(devfreq, |
846 | DEVFREQ_GOV_RESUME, NULL); | |
847 | } | |
848 | EXPORT_SYMBOL(devfreq_resume_device); | |
849 | ||
3aa173b8 NM |
850 | /** |
851 | * devfreq_add_governor() - Add devfreq governor | |
852 | * @governor: the devfreq governor to be added | |
853 | */ | |
854 | int devfreq_add_governor(struct devfreq_governor *governor) | |
855 | { | |
856 | struct devfreq_governor *g; | |
1b5c1be2 | 857 | struct devfreq *devfreq; |
3aa173b8 NM |
858 | int err = 0; |
859 | ||
860 | if (!governor) { | |
861 | pr_err("%s: Invalid parameters.\n", __func__); | |
862 | return -EINVAL; | |
863 | } | |
864 | ||
865 | mutex_lock(&devfreq_list_lock); | |
866 | g = find_devfreq_governor(governor->name); | |
867 | if (!IS_ERR(g)) { | |
868 | pr_err("%s: governor %s already registered\n", __func__, | |
869 | g->name); | |
870 | err = -EINVAL; | |
871 | goto err_out; | |
872 | } | |
9f3bdd4f | 873 | |
3aa173b8 NM |
874 | list_add(&governor->node, &devfreq_governor_list); |
875 | ||
1b5c1be2 NM |
876 | list_for_each_entry(devfreq, &devfreq_list, node) { |
877 | int ret = 0; | |
878 | struct device *dev = devfreq->dev.parent; | |
879 | ||
880 | if (!strncmp(devfreq->governor_name, governor->name, | |
881 | DEVFREQ_NAME_LEN)) { | |
882 | /* The following should never occur */ | |
883 | if (devfreq->governor) { | |
884 | dev_warn(dev, | |
885 | "%s: Governor %s already present\n", | |
886 | __func__, devfreq->governor->name); | |
887 | ret = devfreq->governor->event_handler(devfreq, | |
888 | DEVFREQ_GOV_STOP, NULL); | |
889 | if (ret) { | |
890 | dev_warn(dev, | |
891 | "%s: Governor %s stop = %d\n", | |
892 | __func__, | |
893 | devfreq->governor->name, ret); | |
894 | } | |
895 | /* Fall through */ | |
896 | } | |
897 | devfreq->governor = governor; | |
898 | ret = devfreq->governor->event_handler(devfreq, | |
899 | DEVFREQ_GOV_START, NULL); | |
900 | if (ret) { | |
901 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
902 | __func__, devfreq->governor->name, | |
903 | ret); | |
904 | } | |
a3c98b8b MH |
905 | } |
906 | } | |
907 | ||
3aa173b8 NM |
908 | err_out: |
909 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 910 | |
3aa173b8 NM |
911 | return err; |
912 | } | |
913 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 914 | |
3aa173b8 | 915 | /** |
bafeb42b | 916 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
917 | * @governor: the devfreq governor to be removed |
918 | */ | |
919 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
920 | { | |
921 | struct devfreq_governor *g; | |
1b5c1be2 | 922 | struct devfreq *devfreq; |
3aa173b8 NM |
923 | int err = 0; |
924 | ||
925 | if (!governor) { | |
926 | pr_err("%s: Invalid parameters.\n", __func__); | |
927 | return -EINVAL; | |
928 | } | |
929 | ||
930 | mutex_lock(&devfreq_list_lock); | |
931 | g = find_devfreq_governor(governor->name); | |
932 | if (IS_ERR(g)) { | |
933 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 934 | governor->name); |
f9c08e2a | 935 | err = PTR_ERR(g); |
3aa173b8 NM |
936 | goto err_out; |
937 | } | |
1b5c1be2 NM |
938 | list_for_each_entry(devfreq, &devfreq_list, node) { |
939 | int ret; | |
940 | struct device *dev = devfreq->dev.parent; | |
941 | ||
942 | if (!strncmp(devfreq->governor_name, governor->name, | |
943 | DEVFREQ_NAME_LEN)) { | |
944 | /* we should have a devfreq governor! */ | |
945 | if (!devfreq->governor) { | |
946 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
947 | __func__, governor->name); | |
948 | continue; | |
949 | /* Fall through */ | |
950 | } | |
951 | ret = devfreq->governor->event_handler(devfreq, | |
952 | DEVFREQ_GOV_STOP, NULL); | |
953 | if (ret) { | |
954 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
955 | __func__, devfreq->governor->name, | |
956 | ret); | |
957 | } | |
958 | devfreq->governor = NULL; | |
959 | } | |
960 | } | |
3aa173b8 NM |
961 | |
962 | list_del(&governor->node); | |
963 | err_out: | |
964 | mutex_unlock(&devfreq_list_lock); | |
965 | ||
966 | return err; | |
a3c98b8b | 967 | } |
3aa173b8 | 968 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 969 | |
a93d6b0a | 970 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
971 | struct device_attribute *attr, char *buf) |
972 | { | |
1b5c1be2 NM |
973 | if (!to_devfreq(dev)->governor) |
974 | return -EINVAL; | |
975 | ||
9005b650 MH |
976 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
977 | } | |
978 | ||
a93d6b0a | 979 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
980 | const char *buf, size_t count) |
981 | { | |
982 | struct devfreq *df = to_devfreq(dev); | |
983 | int ret; | |
984 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
985 | struct devfreq_governor *governor; | |
986 | ||
987 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
988 | if (ret != 1) | |
989 | return -EINVAL; | |
990 | ||
991 | mutex_lock(&devfreq_list_lock); | |
992 | governor = find_devfreq_governor(str_governor); | |
993 | if (IS_ERR(governor)) { | |
994 | ret = PTR_ERR(governor); | |
995 | goto out; | |
996 | } | |
14a21e7b TJ |
997 | if (df->governor == governor) { |
998 | ret = 0; | |
0359d1af | 999 | goto out; |
bcf23c79 CC |
1000 | } else if (df->governor->immutable || governor->immutable) { |
1001 | ret = -EINVAL; | |
1002 | goto out; | |
14a21e7b | 1003 | } |
0359d1af NM |
1004 | |
1005 | if (df->governor) { | |
1006 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
1007 | if (ret) { | |
1008 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
1009 | __func__, df->governor->name, ret); | |
1010 | goto out; | |
1011 | } | |
1012 | } | |
1013 | df->governor = governor; | |
1014 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
1015 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
1016 | if (ret) | |
1017 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
1018 | __func__, df->governor->name, ret); | |
1019 | out: | |
1020 | mutex_unlock(&devfreq_list_lock); | |
1021 | ||
1022 | if (!ret) | |
1023 | ret = count; | |
1024 | return ret; | |
1025 | } | |
a93d6b0a GKH |
1026 | static DEVICE_ATTR_RW(governor); |
1027 | ||
1028 | static ssize_t available_governors_show(struct device *d, | |
1029 | struct device_attribute *attr, | |
1030 | char *buf) | |
50a5b33e | 1031 | { |
bcf23c79 | 1032 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
1033 | ssize_t count = 0; |
1034 | ||
1035 | mutex_lock(&devfreq_list_lock); | |
bcf23c79 CC |
1036 | |
1037 | /* | |
1038 | * The devfreq with immutable governor (e.g., passive) shows | |
1039 | * only own governor. | |
1040 | */ | |
1041 | if (df->governor->immutable) { | |
1042 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, | |
1043 | "%s ", df->governor_name); | |
1044 | /* | |
1045 | * The devfreq device shows the registered governor except for | |
1046 | * immutable governors such as passive governor . | |
1047 | */ | |
1048 | } else { | |
1049 | struct devfreq_governor *governor; | |
1050 | ||
1051 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
1052 | if (governor->immutable) | |
1053 | continue; | |
1054 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1055 | "%s ", governor->name); | |
1056 | } | |
1057 | } | |
1058 | ||
50a5b33e NM |
1059 | mutex_unlock(&devfreq_list_lock); |
1060 | ||
1061 | /* Truncate the trailing space */ | |
1062 | if (count) | |
1063 | count--; | |
1064 | ||
1065 | count += sprintf(&buf[count], "\n"); | |
1066 | ||
1067 | return count; | |
1068 | } | |
a93d6b0a | 1069 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1070 | |
a93d6b0a GKH |
1071 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1072 | char *buf) | |
7f98a905 RV |
1073 | { |
1074 | unsigned long freq; | |
1075 | struct devfreq *devfreq = to_devfreq(dev); | |
1076 | ||
1077 | if (devfreq->profile->get_cur_freq && | |
1078 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
9d0109be | 1079 | return sprintf(buf, "%lu\n", freq); |
7f98a905 RV |
1080 | |
1081 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1082 | } | |
a93d6b0a | 1083 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1084 | |
a93d6b0a GKH |
1085 | static ssize_t target_freq_show(struct device *dev, |
1086 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1087 | { |
1088 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1089 | } | |
a93d6b0a | 1090 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1091 | |
a93d6b0a | 1092 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1093 | struct device_attribute *attr, char *buf) |
1094 | { | |
1095 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1096 | } | |
1097 | ||
a93d6b0a | 1098 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1099 | struct device_attribute *attr, |
1100 | const char *buf, size_t count) | |
1101 | { | |
1102 | struct devfreq *df = to_devfreq(dev); | |
1103 | unsigned int value; | |
1104 | int ret; | |
1105 | ||
1b5c1be2 NM |
1106 | if (!df->governor) |
1107 | return -EINVAL; | |
1108 | ||
9005b650 MH |
1109 | ret = sscanf(buf, "%u", &value); |
1110 | if (ret != 1) | |
12e26265 | 1111 | return -EINVAL; |
9005b650 | 1112 | |
7e6fdd4b | 1113 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
1114 | ret = count; |
1115 | ||
9005b650 MH |
1116 | return ret; |
1117 | } | |
a93d6b0a | 1118 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1119 | |
a93d6b0a | 1120 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1121 | const char *buf, size_t count) |
1122 | { | |
1123 | struct devfreq *df = to_devfreq(dev); | |
1124 | unsigned long value; | |
1125 | int ret; | |
1126 | unsigned long max; | |
1127 | ||
1128 | ret = sscanf(buf, "%lu", &value); | |
1129 | if (ret != 1) | |
12e26265 | 1130 | return -EINVAL; |
6530b9de MH |
1131 | |
1132 | mutex_lock(&df->lock); | |
1133 | max = df->max_freq; | |
1134 | if (value && max && value > max) { | |
1135 | ret = -EINVAL; | |
1136 | goto unlock; | |
1137 | } | |
1138 | ||
1139 | df->min_freq = value; | |
1140 | update_devfreq(df); | |
1141 | ret = count; | |
1142 | unlock: | |
1143 | mutex_unlock(&df->lock); | |
6530b9de MH |
1144 | return ret; |
1145 | } | |
1146 | ||
1051e2c3 CC |
1147 | static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr, |
1148 | char *buf) | |
1149 | { | |
f1d981ea CC |
1150 | struct devfreq *df = to_devfreq(dev); |
1151 | ||
1152 | return sprintf(buf, "%lu\n", MAX(df->scaling_min_freq, df->min_freq)); | |
1051e2c3 CC |
1153 | } |
1154 | ||
a93d6b0a | 1155 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1156 | const char *buf, size_t count) |
1157 | { | |
1158 | struct devfreq *df = to_devfreq(dev); | |
1159 | unsigned long value; | |
1160 | int ret; | |
1161 | unsigned long min; | |
1162 | ||
1163 | ret = sscanf(buf, "%lu", &value); | |
1164 | if (ret != 1) | |
12e26265 | 1165 | return -EINVAL; |
6530b9de MH |
1166 | |
1167 | mutex_lock(&df->lock); | |
1168 | min = df->min_freq; | |
1169 | if (value && min && value < min) { | |
1170 | ret = -EINVAL; | |
1171 | goto unlock; | |
1172 | } | |
1173 | ||
1174 | df->max_freq = value; | |
1175 | update_devfreq(df); | |
1176 | ret = count; | |
1177 | unlock: | |
1178 | mutex_unlock(&df->lock); | |
6530b9de MH |
1179 | return ret; |
1180 | } | |
1051e2c3 | 1181 | static DEVICE_ATTR_RW(min_freq); |
6530b9de | 1182 | |
1051e2c3 CC |
1183 | static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr, |
1184 | char *buf) | |
1185 | { | |
f1d981ea CC |
1186 | struct devfreq *df = to_devfreq(dev); |
1187 | ||
1188 | return sprintf(buf, "%lu\n", MIN(df->scaling_max_freq, df->max_freq)); | |
6530b9de | 1189 | } |
a93d6b0a | 1190 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1191 | |
a93d6b0a GKH |
1192 | static ssize_t available_frequencies_show(struct device *d, |
1193 | struct device_attribute *attr, | |
1194 | char *buf) | |
d287de85 NM |
1195 | { |
1196 | struct devfreq *df = to_devfreq(d); | |
1197 | struct device *dev = df->dev.parent; | |
47d43ba7 | 1198 | struct dev_pm_opp *opp; |
d287de85 NM |
1199 | ssize_t count = 0; |
1200 | unsigned long freq = 0; | |
1201 | ||
d287de85 | 1202 | do { |
5d4879cd | 1203 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); |
d287de85 NM |
1204 | if (IS_ERR(opp)) |
1205 | break; | |
1206 | ||
8a31d9d9 | 1207 | dev_pm_opp_put(opp); |
d287de85 NM |
1208 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
1209 | "%lu ", freq); | |
1210 | freq++; | |
1211 | } while (1); | |
d287de85 NM |
1212 | |
1213 | /* Truncate the trailing space */ | |
1214 | if (count) | |
1215 | count--; | |
1216 | ||
1217 | count += sprintf(&buf[count], "\n"); | |
1218 | ||
1219 | return count; | |
1220 | } | |
a93d6b0a | 1221 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1222 | |
a93d6b0a GKH |
1223 | static ssize_t trans_stat_show(struct device *dev, |
1224 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1225 | { |
1226 | struct devfreq *devfreq = to_devfreq(dev); | |
1227 | ssize_t len; | |
39688ce6 | 1228 | int i, j; |
e552bbaf JL |
1229 | unsigned int max_state = devfreq->profile->max_state; |
1230 | ||
39688ce6 RV |
1231 | if (!devfreq->stop_polling && |
1232 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1233 | return 0; |
34bd3220 MH |
1234 | if (max_state == 0) |
1235 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1236 | |
d7df1e46 CC |
1237 | len = sprintf(buf, " From : To\n"); |
1238 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1239 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1240 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1241 | devfreq->profile->freq_table[i]); |
1242 | ||
1243 | len += sprintf(buf + len, " time(ms)\n"); | |
1244 | ||
1245 | for (i = 0; i < max_state; i++) { | |
1246 | if (devfreq->profile->freq_table[i] | |
1247 | == devfreq->previous_freq) { | |
1248 | len += sprintf(buf + len, "*"); | |
1249 | } else { | |
1250 | len += sprintf(buf + len, " "); | |
1251 | } | |
d7df1e46 | 1252 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1253 | devfreq->profile->freq_table[i]); |
1254 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1255 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1256 | devfreq->trans_table[(i * max_state) + j]); |
1257 | len += sprintf(buf + len, "%10u\n", | |
1258 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1259 | } | |
1260 | ||
1261 | len += sprintf(buf + len, "Total transition : %u\n", | |
1262 | devfreq->total_trans); | |
1263 | return len; | |
1264 | } | |
a93d6b0a GKH |
1265 | static DEVICE_ATTR_RO(trans_stat); |
1266 | ||
1267 | static struct attribute *devfreq_attrs[] = { | |
1268 | &dev_attr_governor.attr, | |
1269 | &dev_attr_available_governors.attr, | |
1270 | &dev_attr_cur_freq.attr, | |
1271 | &dev_attr_available_frequencies.attr, | |
1272 | &dev_attr_target_freq.attr, | |
1273 | &dev_attr_polling_interval.attr, | |
1274 | &dev_attr_min_freq.attr, | |
1275 | &dev_attr_max_freq.attr, | |
1276 | &dev_attr_trans_stat.attr, | |
1277 | NULL, | |
9005b650 | 1278 | }; |
a93d6b0a | 1279 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1280 | |
a3c98b8b MH |
1281 | static int __init devfreq_init(void) |
1282 | { | |
1283 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1284 | if (IS_ERR(devfreq_class)) { | |
1285 | pr_err("%s: couldn't create class\n", __FILE__); | |
1286 | return PTR_ERR(devfreq_class); | |
1287 | } | |
7e6fdd4b RV |
1288 | |
1289 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1290 | if (!devfreq_wq) { |
7e6fdd4b RV |
1291 | class_destroy(devfreq_class); |
1292 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1293 | return -ENOMEM; |
7e6fdd4b | 1294 | } |
a93d6b0a | 1295 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1296 | |
a3c98b8b MH |
1297 | return 0; |
1298 | } | |
1299 | subsys_initcall(devfreq_init); | |
1300 | ||
a3c98b8b | 1301 | /* |
4091fb95 | 1302 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1303 | * OPP framework. |
1304 | */ | |
1305 | ||
1306 | /** | |
1307 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1308 | * freq value given to target callback. | |
c5b4a1c1 NM |
1309 | * @dev: The devfreq user device. (parent of devfreq) |
1310 | * @freq: The frequency given to target function | |
1311 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1312 | * |
8a31d9d9 VK |
1313 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1314 | * use. | |
a3c98b8b | 1315 | */ |
47d43ba7 NM |
1316 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1317 | unsigned long *freq, | |
1318 | u32 flags) | |
a3c98b8b | 1319 | { |
47d43ba7 | 1320 | struct dev_pm_opp *opp; |
a3c98b8b | 1321 | |
ab5f299f MH |
1322 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1323 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1324 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1325 | |
1326 | /* If not available, use the closest opp */ | |
0779726c | 1327 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1328 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1329 | } else { |
1330 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1331 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1332 | |
1333 | /* If not available, use the closest opp */ | |
0779726c | 1334 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1335 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1336 | } |
1337 | ||
a3c98b8b MH |
1338 | return opp; |
1339 | } | |
bd7e9277 | 1340 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1341 | |
1342 | /** | |
1343 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
1344 | * for any changes in the OPP availability | |
1345 | * changes | |
c5b4a1c1 NM |
1346 | * @dev: The devfreq user device. (parent of devfreq) |
1347 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1348 | */ |
1349 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1350 | { | |
dc2c9ad5 | 1351 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 1352 | } |
bd7e9277 | 1353 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1354 | |
1355 | /** | |
1356 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
1357 | * notified for any changes in the OPP | |
1358 | * availability changes anymore. | |
c5b4a1c1 NM |
1359 | * @dev: The devfreq user device. (parent of devfreq) |
1360 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1361 | * |
1362 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1363 | * devfreq_recommended_opp is used. | |
1364 | */ | |
1365 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1366 | { | |
dc2c9ad5 | 1367 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 1368 | } |
bd7e9277 | 1369 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1370 | |
d5b040d0 CC |
1371 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1372 | { | |
1373 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * devm_ devfreq_register_opp_notifier() | |
1378 | * - Resource-managed devfreq_register_opp_notifier() | |
1379 | * @dev: The devfreq user device. (parent of devfreq) | |
1380 | * @devfreq: The devfreq object. | |
1381 | */ | |
1382 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1383 | struct devfreq *devfreq) | |
1384 | { | |
1385 | struct devfreq **ptr; | |
1386 | int ret; | |
1387 | ||
1388 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1389 | if (!ptr) | |
1390 | return -ENOMEM; | |
1391 | ||
1392 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1393 | if (ret) { | |
1394 | devres_free(ptr); | |
1395 | return ret; | |
1396 | } | |
1397 | ||
1398 | *ptr = devfreq; | |
1399 | devres_add(dev, ptr); | |
1400 | ||
1401 | return 0; | |
1402 | } | |
1403 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1404 | ||
1405 | /** | |
1406 | * devm_devfreq_unregister_opp_notifier() | |
1407 | * - Resource-managed devfreq_unregister_opp_notifier() | |
1408 | * @dev: The devfreq user device. (parent of devfreq) | |
1409 | * @devfreq: The devfreq object. | |
1410 | */ | |
1411 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1412 | struct devfreq *devfreq) | |
1413 | { | |
1414 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1415 | devm_devfreq_dev_match, devfreq)); | |
1416 | } | |
1417 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1418 | ||
0fe3a664 CC |
1419 | /** |
1420 | * devfreq_register_notifier() - Register a driver with devfreq | |
1421 | * @devfreq: The devfreq object. | |
1422 | * @nb: The notifier block to register. | |
1423 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1424 | */ | |
1425 | int devfreq_register_notifier(struct devfreq *devfreq, | |
1426 | struct notifier_block *nb, | |
1427 | unsigned int list) | |
1428 | { | |
1429 | int ret = 0; | |
1430 | ||
1431 | if (!devfreq) | |
1432 | return -EINVAL; | |
1433 | ||
1434 | switch (list) { | |
1435 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1436 | ret = srcu_notifier_chain_register( | |
1437 | &devfreq->transition_notifier_list, nb); | |
1438 | break; | |
1439 | default: | |
1440 | ret = -EINVAL; | |
1441 | } | |
1442 | ||
1443 | return ret; | |
1444 | } | |
1445 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1446 | ||
1447 | /* | |
1448 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1449 | * @devfreq: The devfreq object. | |
1450 | * @nb: The notifier block to be unregistered. | |
1451 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1452 | */ | |
1453 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1454 | struct notifier_block *nb, | |
1455 | unsigned int list) | |
1456 | { | |
1457 | int ret = 0; | |
1458 | ||
1459 | if (!devfreq) | |
1460 | return -EINVAL; | |
1461 | ||
1462 | switch (list) { | |
1463 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1464 | ret = srcu_notifier_chain_unregister( | |
1465 | &devfreq->transition_notifier_list, nb); | |
1466 | break; | |
1467 | default: | |
1468 | ret = -EINVAL; | |
1469 | } | |
1470 | ||
1471 | return ret; | |
1472 | } | |
1473 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1474 | ||
1475 | struct devfreq_notifier_devres { | |
1476 | struct devfreq *devfreq; | |
1477 | struct notifier_block *nb; | |
1478 | unsigned int list; | |
1479 | }; | |
1480 | ||
1481 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1482 | { | |
1483 | struct devfreq_notifier_devres *this = res; | |
1484 | ||
1485 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * devm_devfreq_register_notifier() | |
1490 | - Resource-managed devfreq_register_notifier() | |
1491 | * @dev: The devfreq user device. (parent of devfreq) | |
1492 | * @devfreq: The devfreq object. | |
1493 | * @nb: The notifier block to be unregistered. | |
1494 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1495 | */ | |
1496 | int devm_devfreq_register_notifier(struct device *dev, | |
1497 | struct devfreq *devfreq, | |
1498 | struct notifier_block *nb, | |
1499 | unsigned int list) | |
1500 | { | |
1501 | struct devfreq_notifier_devres *ptr; | |
1502 | int ret; | |
1503 | ||
1504 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1505 | GFP_KERNEL); | |
1506 | if (!ptr) | |
1507 | return -ENOMEM; | |
1508 | ||
1509 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1510 | if (ret) { | |
1511 | devres_free(ptr); | |
1512 | return ret; | |
1513 | } | |
1514 | ||
1515 | ptr->devfreq = devfreq; | |
1516 | ptr->nb = nb; | |
1517 | ptr->list = list; | |
1518 | devres_add(dev, ptr); | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1523 | ||
1524 | /** | |
1525 | * devm_devfreq_unregister_notifier() | |
1526 | - Resource-managed devfreq_unregister_notifier() | |
1527 | * @dev: The devfreq user device. (parent of devfreq) | |
1528 | * @devfreq: The devfreq object. | |
1529 | * @nb: The notifier block to be unregistered. | |
1530 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1531 | */ | |
1532 | void devm_devfreq_unregister_notifier(struct device *dev, | |
1533 | struct devfreq *devfreq, | |
1534 | struct notifier_block *nb, | |
1535 | unsigned int list) | |
1536 | { | |
1537 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1538 | devm_devfreq_dev_match, devfreq)); | |
1539 | } | |
1540 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |