Commit | Line | Data |
---|---|---|
a3c98b8b MH |
1 | /* |
2 | * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework | |
3 | * for Non-CPU Devices. | |
4 | * | |
5 | * Copyright (C) 2011 Samsung Electronics | |
6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
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 | ||
0ec09ac2 CC |
114 | for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { |
115 | opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); | |
116 | if (IS_ERR(opp)) { | |
117 | devm_kfree(devfreq->dev.parent, profile->freq_table); | |
118 | profile->max_state = 0; | |
0ec09ac2 CC |
119 | return; |
120 | } | |
8a31d9d9 | 121 | dev_pm_opp_put(opp); |
0ec09ac2 CC |
122 | profile->freq_table[i] = freq; |
123 | } | |
0ec09ac2 CC |
124 | } |
125 | ||
e552bbaf JL |
126 | /** |
127 | * devfreq_update_status() - Update statistics of devfreq behavior | |
128 | * @devfreq: the devfreq instance | |
129 | * @freq: the update target frequency | |
130 | */ | |
30582c25 | 131 | int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) |
e552bbaf | 132 | { |
e35d35a1 | 133 | int lev, prev_lev, ret = 0; |
e552bbaf JL |
134 | unsigned long cur_time; |
135 | ||
e552bbaf | 136 | cur_time = jiffies; |
e35d35a1 | 137 | |
d0563a03 TJ |
138 | /* Immediately exit if previous_freq is not initialized yet. */ |
139 | if (!devfreq->previous_freq) | |
140 | goto out; | |
141 | ||
e35d35a1 SK |
142 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); |
143 | if (prev_lev < 0) { | |
144 | ret = prev_lev; | |
145 | goto out; | |
146 | } | |
147 | ||
148 | devfreq->time_in_state[prev_lev] += | |
e552bbaf | 149 | cur_time - devfreq->last_stat_updated; |
e35d35a1 SK |
150 | |
151 | lev = devfreq_get_freq_level(devfreq, freq); | |
152 | if (lev < 0) { | |
153 | ret = lev; | |
154 | goto out; | |
155 | } | |
156 | ||
157 | if (lev != prev_lev) { | |
e552bbaf JL |
158 | devfreq->trans_table[(prev_lev * |
159 | devfreq->profile->max_state) + lev]++; | |
160 | devfreq->total_trans++; | |
161 | } | |
e552bbaf | 162 | |
e35d35a1 SK |
163 | out: |
164 | devfreq->last_stat_updated = cur_time; | |
165 | return ret; | |
e552bbaf | 166 | } |
30582c25 | 167 | EXPORT_SYMBOL(devfreq_update_status); |
e552bbaf | 168 | |
3aa173b8 NM |
169 | /** |
170 | * find_devfreq_governor() - find devfreq governor from name | |
171 | * @name: name of the governor | |
172 | * | |
173 | * Search the list of devfreq governors and return the matched | |
174 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
175 | */ | |
176 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
177 | { | |
178 | struct devfreq_governor *tmp_governor; | |
179 | ||
9348da2f | 180 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
181 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
182 | return ERR_PTR(-EINVAL); | |
183 | } | |
184 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
185 | "devfreq_list_lock must be locked."); | |
186 | ||
187 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
188 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
189 | return tmp_governor; | |
190 | } | |
191 | ||
192 | return ERR_PTR(-ENODEV); | |
193 | } | |
194 | ||
0fe3a664 CC |
195 | static int devfreq_notify_transition(struct devfreq *devfreq, |
196 | struct devfreq_freqs *freqs, unsigned int state) | |
197 | { | |
198 | if (!devfreq) | |
199 | return -EINVAL; | |
200 | ||
201 | switch (state) { | |
202 | case DEVFREQ_PRECHANGE: | |
203 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
204 | DEVFREQ_PRECHANGE, freqs); | |
205 | break; | |
206 | ||
207 | case DEVFREQ_POSTCHANGE: | |
208 | srcu_notifier_call_chain(&devfreq->transition_notifier_list, | |
209 | DEVFREQ_POSTCHANGE, freqs); | |
210 | break; | |
211 | default: | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
7e6fdd4b RV |
218 | /* Load monitoring helper functions for governors use */ |
219 | ||
a3c98b8b MH |
220 | /** |
221 | * update_devfreq() - Reevaluate the device and configure frequency. | |
222 | * @devfreq: the devfreq instance. | |
223 | * | |
224 | * Note: Lock devfreq->lock before calling update_devfreq | |
225 | * This function is exported for governors. | |
226 | */ | |
227 | int update_devfreq(struct devfreq *devfreq) | |
228 | { | |
0fe3a664 CC |
229 | struct devfreq_freqs freqs; |
230 | unsigned long freq, cur_freq; | |
a3c98b8b | 231 | int err = 0; |
ab5f299f | 232 | u32 flags = 0; |
a3c98b8b MH |
233 | |
234 | if (!mutex_is_locked(&devfreq->lock)) { | |
235 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
236 | return -EINVAL; | |
237 | } | |
238 | ||
1b5c1be2 NM |
239 | if (!devfreq->governor) |
240 | return -EINVAL; | |
241 | ||
a3c98b8b MH |
242 | /* Reevaluate the proper frequency */ |
243 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
244 | if (err) | |
245 | return err; | |
246 | ||
ab5f299f | 247 | /* |
d3b7e174 | 248 | * Adjust the frequency with user freq and QoS. |
ab5f299f | 249 | * |
d3b7e174 JM |
250 | * List from the highest priority |
251 | * max_freq | |
ab5f299f MH |
252 | * min_freq |
253 | */ | |
254 | ||
255 | if (devfreq->min_freq && freq < devfreq->min_freq) { | |
256 | freq = devfreq->min_freq; | |
257 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ | |
258 | } | |
259 | if (devfreq->max_freq && freq > devfreq->max_freq) { | |
260 | freq = devfreq->max_freq; | |
261 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ | |
262 | } | |
263 | ||
0fe3a664 CC |
264 | if (devfreq->profile->get_cur_freq) |
265 | devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); | |
266 | else | |
267 | cur_freq = devfreq->previous_freq; | |
268 | ||
269 | freqs.old = cur_freq; | |
270 | freqs.new = freq; | |
271 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); | |
272 | ||
ab5f299f | 273 | err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); |
0d37189e CC |
274 | if (err) { |
275 | freqs.new = cur_freq; | |
276 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
a3c98b8b | 277 | return err; |
0d37189e | 278 | } |
a3c98b8b | 279 | |
0fe3a664 CC |
280 | freqs.new = freq; |
281 | devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); | |
282 | ||
e552bbaf JL |
283 | if (devfreq->profile->freq_table) |
284 | if (devfreq_update_status(devfreq, freq)) | |
285 | dev_err(&devfreq->dev, | |
286 | "Couldn't update frequency transition information.\n"); | |
287 | ||
a3c98b8b MH |
288 | devfreq->previous_freq = freq; |
289 | return err; | |
290 | } | |
2df5021f | 291 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 292 | |
7e6fdd4b RV |
293 | /** |
294 | * devfreq_monitor() - Periodically poll devfreq objects. | |
295 | * @work: the work struct used to run devfreq_monitor periodically. | |
296 | * | |
297 | */ | |
298 | static void devfreq_monitor(struct work_struct *work) | |
299 | { | |
300 | int err; | |
301 | struct devfreq *devfreq = container_of(work, | |
302 | struct devfreq, work.work); | |
303 | ||
304 | mutex_lock(&devfreq->lock); | |
305 | err = update_devfreq(devfreq); | |
306 | if (err) | |
307 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
308 | ||
309 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
310 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
311 | mutex_unlock(&devfreq->lock); | |
312 | } | |
313 | ||
314 | /** | |
315 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
316 | * @devfreq: the devfreq instance. | |
317 | * | |
318 | * Helper function for starting devfreq device load monitoing. By | |
319 | * default delayed work based monitoring is supported. Function | |
320 | * to be called from governor in response to DEVFREQ_GOV_START | |
321 | * event when device is added to devfreq framework. | |
322 | */ | |
323 | void devfreq_monitor_start(struct devfreq *devfreq) | |
324 | { | |
325 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
326 | if (devfreq->profile->polling_ms) | |
327 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
328 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
329 | } | |
6dcdd8e3 | 330 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
331 | |
332 | /** | |
333 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
334 | * @devfreq: the devfreq instance. | |
335 | * | |
336 | * Helper function to stop devfreq device load monitoing. Function | |
337 | * to be called from governor in response to DEVFREQ_GOV_STOP | |
338 | * event when device is removed from devfreq framework. | |
339 | */ | |
340 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
341 | { | |
342 | cancel_delayed_work_sync(&devfreq->work); | |
343 | } | |
6dcdd8e3 | 344 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
345 | |
346 | /** | |
347 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
348 | * @devfreq: the devfreq instance. | |
349 | * | |
350 | * Helper function to suspend devfreq device load monitoing. Function | |
351 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND | |
352 | * event or when polling interval is set to zero. | |
353 | * | |
354 | * Note: Though this function is same as devfreq_monitor_stop(), | |
355 | * intentionally kept separate to provide hooks for collecting | |
356 | * transition statistics. | |
357 | */ | |
358 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
359 | { | |
360 | mutex_lock(&devfreq->lock); | |
361 | if (devfreq->stop_polling) { | |
362 | mutex_unlock(&devfreq->lock); | |
363 | return; | |
364 | } | |
365 | ||
39688ce6 | 366 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
367 | devfreq->stop_polling = true; |
368 | mutex_unlock(&devfreq->lock); | |
369 | cancel_delayed_work_sync(&devfreq->work); | |
370 | } | |
6dcdd8e3 | 371 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
372 | |
373 | /** | |
374 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
375 | * @devfreq: the devfreq instance. | |
376 | * | |
377 | * Helper function to resume devfreq device load monitoing. Function | |
378 | * to be called from governor in response to DEVFREQ_GOV_RESUME | |
379 | * event or when polling interval is set to non-zero. | |
380 | */ | |
381 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
382 | { | |
39688ce6 RV |
383 | unsigned long freq; |
384 | ||
7e6fdd4b RV |
385 | mutex_lock(&devfreq->lock); |
386 | if (!devfreq->stop_polling) | |
387 | goto out; | |
388 | ||
389 | if (!delayed_work_pending(&devfreq->work) && | |
390 | devfreq->profile->polling_ms) | |
391 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
392 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
393 | |
394 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
395 | devfreq->stop_polling = false; |
396 | ||
39688ce6 RV |
397 | if (devfreq->profile->get_cur_freq && |
398 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
399 | devfreq->previous_freq = freq; | |
400 | ||
7e6fdd4b RV |
401 | out: |
402 | mutex_unlock(&devfreq->lock); | |
403 | } | |
6dcdd8e3 | 404 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
405 | |
406 | /** | |
407 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
408 | * @devfreq: the devfreq instance. | |
409 | * @delay: new polling interval to be set. | |
410 | * | |
411 | * Helper function to set new load monitoring polling interval. Function | |
412 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
413 | */ | |
414 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
415 | { | |
416 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
417 | unsigned int new_delay = *delay; | |
418 | ||
419 | mutex_lock(&devfreq->lock); | |
420 | devfreq->profile->polling_ms = new_delay; | |
421 | ||
422 | if (devfreq->stop_polling) | |
423 | goto out; | |
424 | ||
425 | /* if new delay is zero, stop polling */ | |
426 | if (!new_delay) { | |
427 | mutex_unlock(&devfreq->lock); | |
428 | cancel_delayed_work_sync(&devfreq->work); | |
429 | return; | |
430 | } | |
431 | ||
432 | /* if current delay is zero, start polling with new delay */ | |
433 | if (!cur_delay) { | |
434 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
435 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
436 | goto out; | |
437 | } | |
438 | ||
439 | /* if current delay is greater than new delay, restart polling */ | |
440 | if (cur_delay > new_delay) { | |
441 | mutex_unlock(&devfreq->lock); | |
442 | cancel_delayed_work_sync(&devfreq->work); | |
443 | mutex_lock(&devfreq->lock); | |
444 | if (!devfreq->stop_polling) | |
445 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
446 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
447 | } | |
448 | out: | |
449 | mutex_unlock(&devfreq->lock); | |
450 | } | |
6dcdd8e3 | 451 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
452 | |
453 | /** | |
454 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
455 | * has been changed out of devfreq framework. | |
c5b4a1c1 NM |
456 | * @nb: the notifier_block (supposed to be devfreq->nb) |
457 | * @type: not used | |
458 | * @devp: not used | |
a3c98b8b MH |
459 | * |
460 | * Called by a notifier that uses devfreq->nb. | |
461 | */ | |
462 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
463 | void *devp) | |
464 | { | |
465 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
466 | int ret; | |
467 | ||
468 | mutex_lock(&devfreq->lock); | |
469 | ret = update_devfreq(devfreq); | |
470 | mutex_unlock(&devfreq->lock); | |
471 | ||
472 | return ret; | |
473 | } | |
474 | ||
475 | /** | |
29b6968b CC |
476 | * devfreq_dev_release() - Callback for struct device to release the device. |
477 | * @dev: the devfreq device | |
478 | * | |
479 | * Remove devfreq from the list and release its resources. | |
a3c98b8b | 480 | */ |
29b6968b | 481 | static void devfreq_dev_release(struct device *dev) |
a3c98b8b | 482 | { |
29b6968b CC |
483 | struct devfreq *devfreq = to_devfreq(dev); |
484 | ||
7e6fdd4b RV |
485 | mutex_lock(&devfreq_list_lock); |
486 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
487 | mutex_unlock(&devfreq_list_lock); | |
488 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
489 | return; |
490 | } | |
7e6fdd4b RV |
491 | list_del(&devfreq->node); |
492 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 493 | |
1b5c1be2 NM |
494 | if (devfreq->governor) |
495 | devfreq->governor->event_handler(devfreq, | |
496 | DEVFREQ_GOV_STOP, NULL); | |
a3c98b8b MH |
497 | |
498 | if (devfreq->profile->exit) | |
499 | devfreq->profile->exit(devfreq->dev.parent); | |
500 | ||
a3c98b8b | 501 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
502 | kfree(devfreq); |
503 | } | |
504 | ||
a3c98b8b MH |
505 | /** |
506 | * devfreq_add_device() - Add devfreq feature to the device | |
507 | * @dev: the device to add devfreq feature. | |
508 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 509 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
510 | * @data: private data for the governor. The devfreq framework does not |
511 | * touch this value. | |
512 | */ | |
513 | struct devfreq *devfreq_add_device(struct device *dev, | |
514 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 515 | const char *governor_name, |
a3c98b8b MH |
516 | void *data) |
517 | { | |
518 | struct devfreq *devfreq; | |
1b5c1be2 | 519 | struct devfreq_governor *governor; |
4585fbcb | 520 | static atomic_t devfreq_no = ATOMIC_INIT(-1); |
a3c98b8b MH |
521 | int err = 0; |
522 | ||
1b5c1be2 | 523 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
524 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
525 | return ERR_PTR(-EINVAL); | |
526 | } | |
527 | ||
7e6fdd4b RV |
528 | mutex_lock(&devfreq_list_lock); |
529 | devfreq = find_device_devfreq(dev); | |
530 | mutex_unlock(&devfreq_list_lock); | |
531 | if (!IS_ERR(devfreq)) { | |
9d0109be CC |
532 | dev_err(dev, "%s: Unable to create devfreq for the device.\n", |
533 | __func__); | |
7e6fdd4b RV |
534 | err = -EINVAL; |
535 | goto err_out; | |
a3c98b8b MH |
536 | } |
537 | ||
538 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
539 | if (!devfreq) { | |
a3c98b8b | 540 | err = -ENOMEM; |
3f19f08a | 541 | goto err_out; |
a3c98b8b MH |
542 | } |
543 | ||
544 | mutex_init(&devfreq->lock); | |
545 | mutex_lock(&devfreq->lock); | |
546 | devfreq->dev.parent = dev; | |
547 | devfreq->dev.class = devfreq_class; | |
548 | devfreq->dev.release = devfreq_dev_release; | |
549 | devfreq->profile = profile; | |
1b5c1be2 | 550 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b | 551 | devfreq->previous_freq = profile->initial_freq; |
8d39fc08 | 552 | devfreq->last_status.current_frequency = profile->initial_freq; |
a3c98b8b | 553 | devfreq->data = data; |
a3c98b8b MH |
554 | devfreq->nb.notifier_call = devfreq_notifier_call; |
555 | ||
0ec09ac2 CC |
556 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
557 | mutex_unlock(&devfreq->lock); | |
558 | devfreq_set_freq_table(devfreq); | |
559 | mutex_lock(&devfreq->lock); | |
560 | } | |
561 | ||
4585fbcb CC |
562 | dev_set_name(&devfreq->dev, "devfreq%d", |
563 | atomic_inc_return(&devfreq_no)); | |
a3c98b8b MH |
564 | err = device_register(&devfreq->dev); |
565 | if (err) { | |
7e6fdd4b | 566 | mutex_unlock(&devfreq->lock); |
6d3cbfa7 | 567 | goto err_out; |
a3c98b8b MH |
568 | } |
569 | ||
9d0109be CC |
570 | devfreq->trans_table = devm_kzalloc(&devfreq->dev, |
571 | sizeof(unsigned int) * | |
3e1d7fb0 MH |
572 | devfreq->profile->max_state * |
573 | devfreq->profile->max_state, | |
574 | GFP_KERNEL); | |
9d0109be CC |
575 | devfreq->time_in_state = devm_kzalloc(&devfreq->dev, |
576 | sizeof(unsigned long) * | |
3e1d7fb0 MH |
577 | devfreq->profile->max_state, |
578 | GFP_KERNEL); | |
579 | devfreq->last_stat_updated = jiffies; | |
580 | ||
0fe3a664 CC |
581 | srcu_init_notifier_head(&devfreq->transition_notifier_list); |
582 | ||
a3c98b8b MH |
583 | mutex_unlock(&devfreq->lock); |
584 | ||
a3c98b8b | 585 | mutex_lock(&devfreq_list_lock); |
a3c98b8b MH |
586 | list_add(&devfreq->node, &devfreq_list); |
587 | ||
1b5c1be2 | 588 | governor = find_devfreq_governor(devfreq->governor_name); |
73613b16 CC |
589 | if (IS_ERR(governor)) { |
590 | dev_err(dev, "%s: Unable to find governor for the device\n", | |
591 | __func__); | |
592 | err = PTR_ERR(governor); | |
593 | goto err_init; | |
594 | } | |
595 | ||
596 | devfreq->governor = governor; | |
597 | err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, | |
598 | NULL); | |
7e6fdd4b RV |
599 | if (err) { |
600 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
601 | __func__); | |
602 | goto err_init; | |
a3c98b8b | 603 | } |
0f376c9c | 604 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b | 605 | |
3f19f08a AL |
606 | return devfreq; |
607 | ||
a3c98b8b | 608 | err_init: |
7e6fdd4b | 609 | list_del(&devfreq->node); |
0f376c9c AL |
610 | mutex_unlock(&devfreq_list_lock); |
611 | ||
a3c98b8b | 612 | device_unregister(&devfreq->dev); |
3f19f08a AL |
613 | err_out: |
614 | return ERR_PTR(err); | |
a3c98b8b | 615 | } |
7e6fdd4b | 616 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
617 | |
618 | /** | |
619 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 620 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
621 | * |
622 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
623 | */ |
624 | int devfreq_remove_device(struct devfreq *devfreq) | |
625 | { | |
626 | if (!devfreq) | |
627 | return -EINVAL; | |
628 | ||
585fc83e | 629 | device_unregister(&devfreq->dev); |
9f3bdd4f | 630 | |
a3c98b8b MH |
631 | return 0; |
632 | } | |
7e6fdd4b | 633 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 634 | |
8cd84092 CC |
635 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
636 | { | |
637 | struct devfreq **r = res; | |
638 | ||
639 | if (WARN_ON(!r || !*r)) | |
640 | return 0; | |
641 | ||
642 | return *r == data; | |
643 | } | |
644 | ||
645 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
646 | { | |
647 | devfreq_remove_device(*(struct devfreq **)res); | |
648 | } | |
649 | ||
650 | /** | |
651 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
652 | * @dev: the device to add devfreq feature. | |
653 | * @profile: device-specific profile to run devfreq. | |
654 | * @governor_name: name of the policy to choose frequency. | |
655 | * @data: private data for the governor. The devfreq framework does not | |
656 | * touch this value. | |
657 | * | |
658 | * This function manages automatically the memory of devfreq device using device | |
659 | * resource management and simplify the free operation for memory of devfreq | |
660 | * device. | |
661 | */ | |
662 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
663 | struct devfreq_dev_profile *profile, | |
664 | const char *governor_name, | |
665 | void *data) | |
666 | { | |
667 | struct devfreq **ptr, *devfreq; | |
668 | ||
669 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
670 | if (!ptr) | |
671 | return ERR_PTR(-ENOMEM); | |
672 | ||
673 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
674 | if (IS_ERR(devfreq)) { | |
675 | devres_free(ptr); | |
676 | return ERR_PTR(-ENOMEM); | |
677 | } | |
678 | ||
679 | *ptr = devfreq; | |
680 | devres_add(dev, ptr); | |
681 | ||
682 | return devfreq; | |
683 | } | |
684 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
685 | ||
8f510aeb CC |
686 | #ifdef CONFIG_OF |
687 | /* | |
688 | * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree | |
689 | * @dev - instance to the given device | |
690 | * @index - index into list of devfreq | |
691 | * | |
692 | * return the instance of devfreq device | |
693 | */ | |
694 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
695 | { | |
696 | struct device_node *node; | |
697 | struct devfreq *devfreq; | |
698 | ||
699 | if (!dev) | |
700 | return ERR_PTR(-EINVAL); | |
701 | ||
702 | if (!dev->of_node) | |
703 | return ERR_PTR(-EINVAL); | |
704 | ||
705 | node = of_parse_phandle(dev->of_node, "devfreq", index); | |
706 | if (!node) | |
707 | return ERR_PTR(-ENODEV); | |
708 | ||
709 | mutex_lock(&devfreq_list_lock); | |
710 | list_for_each_entry(devfreq, &devfreq_list, node) { | |
711 | if (devfreq->dev.parent | |
712 | && devfreq->dev.parent->of_node == node) { | |
713 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 714 | of_node_put(node); |
8f510aeb CC |
715 | return devfreq; |
716 | } | |
717 | } | |
718 | mutex_unlock(&devfreq_list_lock); | |
3427c6f0 | 719 | of_node_put(node); |
8f510aeb CC |
720 | |
721 | return ERR_PTR(-EPROBE_DEFER); | |
722 | } | |
723 | #else | |
724 | struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index) | |
725 | { | |
726 | return ERR_PTR(-ENODEV); | |
727 | } | |
728 | #endif /* CONFIG_OF */ | |
729 | EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle); | |
730 | ||
8cd84092 CC |
731 | /** |
732 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
733 | * @dev: the device to add devfreq feature. | |
734 | * @devfreq: the devfreq instance to be removed | |
735 | */ | |
736 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
737 | { | |
738 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
739 | devm_devfreq_dev_match, devfreq)); | |
740 | } | |
741 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
742 | ||
206c30cf RV |
743 | /** |
744 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
745 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
746 | * |
747 | * This function is intended to be called by the pm callbacks | |
748 | * (e.g., runtime_suspend, suspend) of the device driver that | |
749 | * holds the devfreq. | |
206c30cf RV |
750 | */ |
751 | int devfreq_suspend_device(struct devfreq *devfreq) | |
752 | { | |
a3c98b8b MH |
753 | if (!devfreq) |
754 | return -EINVAL; | |
755 | ||
1b5c1be2 NM |
756 | if (!devfreq->governor) |
757 | return 0; | |
758 | ||
206c30cf RV |
759 | return devfreq->governor->event_handler(devfreq, |
760 | DEVFREQ_GOV_SUSPEND, NULL); | |
761 | } | |
762 | EXPORT_SYMBOL(devfreq_suspend_device); | |
763 | ||
764 | /** | |
765 | * devfreq_resume_device() - Resume devfreq of a device. | |
766 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
767 | * |
768 | * This function is intended to be called by the pm callbacks | |
769 | * (e.g., runtime_resume, resume) of the device driver that | |
770 | * holds the devfreq. | |
206c30cf RV |
771 | */ |
772 | int devfreq_resume_device(struct devfreq *devfreq) | |
773 | { | |
774 | if (!devfreq) | |
775 | return -EINVAL; | |
776 | ||
1b5c1be2 NM |
777 | if (!devfreq->governor) |
778 | return 0; | |
779 | ||
206c30cf RV |
780 | return devfreq->governor->event_handler(devfreq, |
781 | DEVFREQ_GOV_RESUME, NULL); | |
782 | } | |
783 | EXPORT_SYMBOL(devfreq_resume_device); | |
784 | ||
3aa173b8 NM |
785 | /** |
786 | * devfreq_add_governor() - Add devfreq governor | |
787 | * @governor: the devfreq governor to be added | |
788 | */ | |
789 | int devfreq_add_governor(struct devfreq_governor *governor) | |
790 | { | |
791 | struct devfreq_governor *g; | |
1b5c1be2 | 792 | struct devfreq *devfreq; |
3aa173b8 NM |
793 | int err = 0; |
794 | ||
795 | if (!governor) { | |
796 | pr_err("%s: Invalid parameters.\n", __func__); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | mutex_lock(&devfreq_list_lock); | |
801 | g = find_devfreq_governor(governor->name); | |
802 | if (!IS_ERR(g)) { | |
803 | pr_err("%s: governor %s already registered\n", __func__, | |
804 | g->name); | |
805 | err = -EINVAL; | |
806 | goto err_out; | |
807 | } | |
9f3bdd4f | 808 | |
3aa173b8 NM |
809 | list_add(&governor->node, &devfreq_governor_list); |
810 | ||
1b5c1be2 NM |
811 | list_for_each_entry(devfreq, &devfreq_list, node) { |
812 | int ret = 0; | |
813 | struct device *dev = devfreq->dev.parent; | |
814 | ||
815 | if (!strncmp(devfreq->governor_name, governor->name, | |
816 | DEVFREQ_NAME_LEN)) { | |
817 | /* The following should never occur */ | |
818 | if (devfreq->governor) { | |
819 | dev_warn(dev, | |
820 | "%s: Governor %s already present\n", | |
821 | __func__, devfreq->governor->name); | |
822 | ret = devfreq->governor->event_handler(devfreq, | |
823 | DEVFREQ_GOV_STOP, NULL); | |
824 | if (ret) { | |
825 | dev_warn(dev, | |
826 | "%s: Governor %s stop = %d\n", | |
827 | __func__, | |
828 | devfreq->governor->name, ret); | |
829 | } | |
830 | /* Fall through */ | |
831 | } | |
832 | devfreq->governor = governor; | |
833 | ret = devfreq->governor->event_handler(devfreq, | |
834 | DEVFREQ_GOV_START, NULL); | |
835 | if (ret) { | |
836 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
837 | __func__, devfreq->governor->name, | |
838 | ret); | |
839 | } | |
a3c98b8b MH |
840 | } |
841 | } | |
842 | ||
3aa173b8 NM |
843 | err_out: |
844 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 845 | |
3aa173b8 NM |
846 | return err; |
847 | } | |
848 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 849 | |
3aa173b8 | 850 | /** |
bafeb42b | 851 | * devfreq_remove_governor() - Remove devfreq feature from a device. |
3aa173b8 NM |
852 | * @governor: the devfreq governor to be removed |
853 | */ | |
854 | int devfreq_remove_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 not registered\n", __func__, | |
b9e1c8e8 | 869 | governor->name); |
f9c08e2a | 870 | err = PTR_ERR(g); |
3aa173b8 NM |
871 | goto err_out; |
872 | } | |
1b5c1be2 NM |
873 | list_for_each_entry(devfreq, &devfreq_list, node) { |
874 | int ret; | |
875 | struct device *dev = devfreq->dev.parent; | |
876 | ||
877 | if (!strncmp(devfreq->governor_name, governor->name, | |
878 | DEVFREQ_NAME_LEN)) { | |
879 | /* we should have a devfreq governor! */ | |
880 | if (!devfreq->governor) { | |
881 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
882 | __func__, governor->name); | |
883 | continue; | |
884 | /* Fall through */ | |
885 | } | |
886 | ret = devfreq->governor->event_handler(devfreq, | |
887 | DEVFREQ_GOV_STOP, NULL); | |
888 | if (ret) { | |
889 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
890 | __func__, devfreq->governor->name, | |
891 | ret); | |
892 | } | |
893 | devfreq->governor = NULL; | |
894 | } | |
895 | } | |
3aa173b8 NM |
896 | |
897 | list_del(&governor->node); | |
898 | err_out: | |
899 | mutex_unlock(&devfreq_list_lock); | |
900 | ||
901 | return err; | |
a3c98b8b | 902 | } |
3aa173b8 | 903 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 904 | |
a93d6b0a | 905 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
906 | struct device_attribute *attr, char *buf) |
907 | { | |
1b5c1be2 NM |
908 | if (!to_devfreq(dev)->governor) |
909 | return -EINVAL; | |
910 | ||
9005b650 MH |
911 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
912 | } | |
913 | ||
a93d6b0a | 914 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
915 | const char *buf, size_t count) |
916 | { | |
917 | struct devfreq *df = to_devfreq(dev); | |
918 | int ret; | |
919 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
920 | struct devfreq_governor *governor; | |
921 | ||
922 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
923 | if (ret != 1) | |
924 | return -EINVAL; | |
925 | ||
926 | mutex_lock(&devfreq_list_lock); | |
927 | governor = find_devfreq_governor(str_governor); | |
928 | if (IS_ERR(governor)) { | |
929 | ret = PTR_ERR(governor); | |
930 | goto out; | |
931 | } | |
14a21e7b TJ |
932 | if (df->governor == governor) { |
933 | ret = 0; | |
0359d1af | 934 | goto out; |
bcf23c79 CC |
935 | } else if (df->governor->immutable || governor->immutable) { |
936 | ret = -EINVAL; | |
937 | goto out; | |
14a21e7b | 938 | } |
0359d1af NM |
939 | |
940 | if (df->governor) { | |
941 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
942 | if (ret) { | |
943 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
944 | __func__, df->governor->name, ret); | |
945 | goto out; | |
946 | } | |
947 | } | |
948 | df->governor = governor; | |
949 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
950 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
951 | if (ret) | |
952 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
953 | __func__, df->governor->name, ret); | |
954 | out: | |
955 | mutex_unlock(&devfreq_list_lock); | |
956 | ||
957 | if (!ret) | |
958 | ret = count; | |
959 | return ret; | |
960 | } | |
a93d6b0a GKH |
961 | static DEVICE_ATTR_RW(governor); |
962 | ||
963 | static ssize_t available_governors_show(struct device *d, | |
964 | struct device_attribute *attr, | |
965 | char *buf) | |
50a5b33e | 966 | { |
bcf23c79 | 967 | struct devfreq *df = to_devfreq(d); |
50a5b33e NM |
968 | ssize_t count = 0; |
969 | ||
970 | mutex_lock(&devfreq_list_lock); | |
bcf23c79 CC |
971 | |
972 | /* | |
973 | * The devfreq with immutable governor (e.g., passive) shows | |
974 | * only own governor. | |
975 | */ | |
976 | if (df->governor->immutable) { | |
977 | count = scnprintf(&buf[count], DEVFREQ_NAME_LEN, | |
978 | "%s ", df->governor_name); | |
979 | /* | |
980 | * The devfreq device shows the registered governor except for | |
981 | * immutable governors such as passive governor . | |
982 | */ | |
983 | } else { | |
984 | struct devfreq_governor *governor; | |
985 | ||
986 | list_for_each_entry(governor, &devfreq_governor_list, node) { | |
987 | if (governor->immutable) | |
988 | continue; | |
989 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
990 | "%s ", governor->name); | |
991 | } | |
992 | } | |
993 | ||
50a5b33e NM |
994 | mutex_unlock(&devfreq_list_lock); |
995 | ||
996 | /* Truncate the trailing space */ | |
997 | if (count) | |
998 | count--; | |
999 | ||
1000 | count += sprintf(&buf[count], "\n"); | |
1001 | ||
1002 | return count; | |
1003 | } | |
a93d6b0a | 1004 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 1005 | |
a93d6b0a GKH |
1006 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
1007 | char *buf) | |
7f98a905 RV |
1008 | { |
1009 | unsigned long freq; | |
1010 | struct devfreq *devfreq = to_devfreq(dev); | |
1011 | ||
1012 | if (devfreq->profile->get_cur_freq && | |
1013 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
9d0109be | 1014 | return sprintf(buf, "%lu\n", freq); |
7f98a905 RV |
1015 | |
1016 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
1017 | } | |
a93d6b0a | 1018 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 1019 | |
a93d6b0a GKH |
1020 | static ssize_t target_freq_show(struct device *dev, |
1021 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
1022 | { |
1023 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
1024 | } | |
a93d6b0a | 1025 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 1026 | |
a93d6b0a | 1027 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
1028 | struct device_attribute *attr, char *buf) |
1029 | { | |
1030 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
1031 | } | |
1032 | ||
a93d6b0a | 1033 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
1034 | struct device_attribute *attr, |
1035 | const char *buf, size_t count) | |
1036 | { | |
1037 | struct devfreq *df = to_devfreq(dev); | |
1038 | unsigned int value; | |
1039 | int ret; | |
1040 | ||
1b5c1be2 NM |
1041 | if (!df->governor) |
1042 | return -EINVAL; | |
1043 | ||
9005b650 MH |
1044 | ret = sscanf(buf, "%u", &value); |
1045 | if (ret != 1) | |
12e26265 | 1046 | return -EINVAL; |
9005b650 | 1047 | |
7e6fdd4b | 1048 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
1049 | ret = count; |
1050 | ||
9005b650 MH |
1051 | return ret; |
1052 | } | |
a93d6b0a | 1053 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 1054 | |
a93d6b0a | 1055 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1056 | const char *buf, size_t count) |
1057 | { | |
1058 | struct devfreq *df = to_devfreq(dev); | |
1059 | unsigned long value; | |
1060 | int ret; | |
1061 | unsigned long max; | |
1062 | ||
1063 | ret = sscanf(buf, "%lu", &value); | |
1064 | if (ret != 1) | |
12e26265 | 1065 | return -EINVAL; |
6530b9de MH |
1066 | |
1067 | mutex_lock(&df->lock); | |
1068 | max = df->max_freq; | |
1069 | if (value && max && value > max) { | |
1070 | ret = -EINVAL; | |
1071 | goto unlock; | |
1072 | } | |
1073 | ||
1074 | df->min_freq = value; | |
1075 | update_devfreq(df); | |
1076 | ret = count; | |
1077 | unlock: | |
1078 | mutex_unlock(&df->lock); | |
6530b9de MH |
1079 | return ret; |
1080 | } | |
1081 | ||
a93d6b0a | 1082 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
1083 | const char *buf, size_t count) |
1084 | { | |
1085 | struct devfreq *df = to_devfreq(dev); | |
1086 | unsigned long value; | |
1087 | int ret; | |
1088 | unsigned long min; | |
1089 | ||
1090 | ret = sscanf(buf, "%lu", &value); | |
1091 | if (ret != 1) | |
12e26265 | 1092 | return -EINVAL; |
6530b9de MH |
1093 | |
1094 | mutex_lock(&df->lock); | |
1095 | min = df->min_freq; | |
1096 | if (value && min && value < min) { | |
1097 | ret = -EINVAL; | |
1098 | goto unlock; | |
1099 | } | |
1100 | ||
1101 | df->max_freq = value; | |
1102 | update_devfreq(df); | |
1103 | ret = count; | |
1104 | unlock: | |
1105 | mutex_unlock(&df->lock); | |
6530b9de MH |
1106 | return ret; |
1107 | } | |
1108 | ||
3104fa30 CC |
1109 | #define show_one(name) \ |
1110 | static ssize_t name##_show \ | |
1111 | (struct device *dev, struct device_attribute *attr, char *buf) \ | |
1112 | { \ | |
1113 | return sprintf(buf, "%lu\n", to_devfreq(dev)->name); \ | |
6530b9de | 1114 | } |
3104fa30 CC |
1115 | show_one(min_freq); |
1116 | show_one(max_freq); | |
1117 | ||
1118 | static DEVICE_ATTR_RW(min_freq); | |
a93d6b0a | 1119 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1120 | |
a93d6b0a GKH |
1121 | static ssize_t available_frequencies_show(struct device *d, |
1122 | struct device_attribute *attr, | |
1123 | char *buf) | |
d287de85 NM |
1124 | { |
1125 | struct devfreq *df = to_devfreq(d); | |
1126 | struct device *dev = df->dev.parent; | |
47d43ba7 | 1127 | struct dev_pm_opp *opp; |
d287de85 NM |
1128 | ssize_t count = 0; |
1129 | unsigned long freq = 0; | |
1130 | ||
d287de85 | 1131 | do { |
5d4879cd | 1132 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); |
d287de85 NM |
1133 | if (IS_ERR(opp)) |
1134 | break; | |
1135 | ||
8a31d9d9 | 1136 | dev_pm_opp_put(opp); |
d287de85 NM |
1137 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), |
1138 | "%lu ", freq); | |
1139 | freq++; | |
1140 | } while (1); | |
d287de85 NM |
1141 | |
1142 | /* Truncate the trailing space */ | |
1143 | if (count) | |
1144 | count--; | |
1145 | ||
1146 | count += sprintf(&buf[count], "\n"); | |
1147 | ||
1148 | return count; | |
1149 | } | |
a93d6b0a | 1150 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1151 | |
a93d6b0a GKH |
1152 | static ssize_t trans_stat_show(struct device *dev, |
1153 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1154 | { |
1155 | struct devfreq *devfreq = to_devfreq(dev); | |
1156 | ssize_t len; | |
39688ce6 | 1157 | int i, j; |
e552bbaf JL |
1158 | unsigned int max_state = devfreq->profile->max_state; |
1159 | ||
39688ce6 RV |
1160 | if (!devfreq->stop_polling && |
1161 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1162 | return 0; |
34bd3220 MH |
1163 | if (max_state == 0) |
1164 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1165 | |
d7df1e46 CC |
1166 | len = sprintf(buf, " From : To\n"); |
1167 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1168 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1169 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1170 | devfreq->profile->freq_table[i]); |
1171 | ||
1172 | len += sprintf(buf + len, " time(ms)\n"); | |
1173 | ||
1174 | for (i = 0; i < max_state; i++) { | |
1175 | if (devfreq->profile->freq_table[i] | |
1176 | == devfreq->previous_freq) { | |
1177 | len += sprintf(buf + len, "*"); | |
1178 | } else { | |
1179 | len += sprintf(buf + len, " "); | |
1180 | } | |
d7df1e46 | 1181 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1182 | devfreq->profile->freq_table[i]); |
1183 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1184 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1185 | devfreq->trans_table[(i * max_state) + j]); |
1186 | len += sprintf(buf + len, "%10u\n", | |
1187 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1188 | } | |
1189 | ||
1190 | len += sprintf(buf + len, "Total transition : %u\n", | |
1191 | devfreq->total_trans); | |
1192 | return len; | |
1193 | } | |
a93d6b0a GKH |
1194 | static DEVICE_ATTR_RO(trans_stat); |
1195 | ||
1196 | static struct attribute *devfreq_attrs[] = { | |
1197 | &dev_attr_governor.attr, | |
1198 | &dev_attr_available_governors.attr, | |
1199 | &dev_attr_cur_freq.attr, | |
1200 | &dev_attr_available_frequencies.attr, | |
1201 | &dev_attr_target_freq.attr, | |
1202 | &dev_attr_polling_interval.attr, | |
1203 | &dev_attr_min_freq.attr, | |
1204 | &dev_attr_max_freq.attr, | |
1205 | &dev_attr_trans_stat.attr, | |
1206 | NULL, | |
9005b650 | 1207 | }; |
a93d6b0a | 1208 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1209 | |
a3c98b8b MH |
1210 | static int __init devfreq_init(void) |
1211 | { | |
1212 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1213 | if (IS_ERR(devfreq_class)) { | |
1214 | pr_err("%s: couldn't create class\n", __FILE__); | |
1215 | return PTR_ERR(devfreq_class); | |
1216 | } | |
7e6fdd4b RV |
1217 | |
1218 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1219 | if (!devfreq_wq) { |
7e6fdd4b RV |
1220 | class_destroy(devfreq_class); |
1221 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1222 | return -ENOMEM; |
7e6fdd4b | 1223 | } |
a93d6b0a | 1224 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1225 | |
a3c98b8b MH |
1226 | return 0; |
1227 | } | |
1228 | subsys_initcall(devfreq_init); | |
1229 | ||
a3c98b8b | 1230 | /* |
4091fb95 | 1231 | * The following are helper functions for devfreq user device drivers with |
a3c98b8b MH |
1232 | * OPP framework. |
1233 | */ | |
1234 | ||
1235 | /** | |
1236 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1237 | * freq value given to target callback. | |
c5b4a1c1 NM |
1238 | * @dev: The devfreq user device. (parent of devfreq) |
1239 | * @freq: The frequency given to target function | |
1240 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1241 | * |
8a31d9d9 VK |
1242 | * The callers are required to call dev_pm_opp_put() for the returned OPP after |
1243 | * use. | |
a3c98b8b | 1244 | */ |
47d43ba7 NM |
1245 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1246 | unsigned long *freq, | |
1247 | u32 flags) | |
a3c98b8b | 1248 | { |
47d43ba7 | 1249 | struct dev_pm_opp *opp; |
a3c98b8b | 1250 | |
ab5f299f MH |
1251 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1252 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1253 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1254 | |
1255 | /* If not available, use the closest opp */ | |
0779726c | 1256 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1257 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1258 | } else { |
1259 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1260 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1261 | |
1262 | /* If not available, use the closest opp */ | |
0779726c | 1263 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1264 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1265 | } |
1266 | ||
a3c98b8b MH |
1267 | return opp; |
1268 | } | |
bd7e9277 | 1269 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1270 | |
1271 | /** | |
1272 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
1273 | * for any changes in the OPP availability | |
1274 | * changes | |
c5b4a1c1 NM |
1275 | * @dev: The devfreq user device. (parent of devfreq) |
1276 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1277 | */ |
1278 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1279 | { | |
dc2c9ad5 | 1280 | return dev_pm_opp_register_notifier(dev, &devfreq->nb); |
a3c98b8b | 1281 | } |
bd7e9277 | 1282 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1283 | |
1284 | /** | |
1285 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
1286 | * notified for any changes in the OPP | |
1287 | * availability changes anymore. | |
c5b4a1c1 NM |
1288 | * @dev: The devfreq user device. (parent of devfreq) |
1289 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1290 | * |
1291 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1292 | * devfreq_recommended_opp is used. | |
1293 | */ | |
1294 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1295 | { | |
dc2c9ad5 | 1296 | return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); |
a3c98b8b | 1297 | } |
bd7e9277 | 1298 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1299 | |
d5b040d0 CC |
1300 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1301 | { | |
1302 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1303 | } | |
1304 | ||
1305 | /** | |
1306 | * devm_ devfreq_register_opp_notifier() | |
1307 | * - Resource-managed devfreq_register_opp_notifier() | |
1308 | * @dev: The devfreq user device. (parent of devfreq) | |
1309 | * @devfreq: The devfreq object. | |
1310 | */ | |
1311 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1312 | struct devfreq *devfreq) | |
1313 | { | |
1314 | struct devfreq **ptr; | |
1315 | int ret; | |
1316 | ||
1317 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1318 | if (!ptr) | |
1319 | return -ENOMEM; | |
1320 | ||
1321 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1322 | if (ret) { | |
1323 | devres_free(ptr); | |
1324 | return ret; | |
1325 | } | |
1326 | ||
1327 | *ptr = devfreq; | |
1328 | devres_add(dev, ptr); | |
1329 | ||
1330 | return 0; | |
1331 | } | |
1332 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1333 | ||
1334 | /** | |
1335 | * devm_devfreq_unregister_opp_notifier() | |
1336 | * - Resource-managed devfreq_unregister_opp_notifier() | |
1337 | * @dev: The devfreq user device. (parent of devfreq) | |
1338 | * @devfreq: The devfreq object. | |
1339 | */ | |
1340 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1341 | struct devfreq *devfreq) | |
1342 | { | |
1343 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1344 | devm_devfreq_dev_match, devfreq)); | |
1345 | } | |
1346 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1347 | ||
0fe3a664 CC |
1348 | /** |
1349 | * devfreq_register_notifier() - Register a driver with devfreq | |
1350 | * @devfreq: The devfreq object. | |
1351 | * @nb: The notifier block to register. | |
1352 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1353 | */ | |
1354 | int devfreq_register_notifier(struct devfreq *devfreq, | |
1355 | struct notifier_block *nb, | |
1356 | unsigned int list) | |
1357 | { | |
1358 | int ret = 0; | |
1359 | ||
1360 | if (!devfreq) | |
1361 | return -EINVAL; | |
1362 | ||
1363 | switch (list) { | |
1364 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1365 | ret = srcu_notifier_chain_register( | |
1366 | &devfreq->transition_notifier_list, nb); | |
1367 | break; | |
1368 | default: | |
1369 | ret = -EINVAL; | |
1370 | } | |
1371 | ||
1372 | return ret; | |
1373 | } | |
1374 | EXPORT_SYMBOL(devfreq_register_notifier); | |
1375 | ||
1376 | /* | |
1377 | * devfreq_unregister_notifier() - Unregister a driver with devfreq | |
1378 | * @devfreq: The devfreq object. | |
1379 | * @nb: The notifier block to be unregistered. | |
1380 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1381 | */ | |
1382 | int devfreq_unregister_notifier(struct devfreq *devfreq, | |
1383 | struct notifier_block *nb, | |
1384 | unsigned int list) | |
1385 | { | |
1386 | int ret = 0; | |
1387 | ||
1388 | if (!devfreq) | |
1389 | return -EINVAL; | |
1390 | ||
1391 | switch (list) { | |
1392 | case DEVFREQ_TRANSITION_NOTIFIER: | |
1393 | ret = srcu_notifier_chain_unregister( | |
1394 | &devfreq->transition_notifier_list, nb); | |
1395 | break; | |
1396 | default: | |
1397 | ret = -EINVAL; | |
1398 | } | |
1399 | ||
1400 | return ret; | |
1401 | } | |
1402 | EXPORT_SYMBOL(devfreq_unregister_notifier); | |
1403 | ||
1404 | struct devfreq_notifier_devres { | |
1405 | struct devfreq *devfreq; | |
1406 | struct notifier_block *nb; | |
1407 | unsigned int list; | |
1408 | }; | |
1409 | ||
1410 | static void devm_devfreq_notifier_release(struct device *dev, void *res) | |
1411 | { | |
1412 | struct devfreq_notifier_devres *this = res; | |
1413 | ||
1414 | devfreq_unregister_notifier(this->devfreq, this->nb, this->list); | |
1415 | } | |
1416 | ||
1417 | /** | |
1418 | * devm_devfreq_register_notifier() | |
1419 | - Resource-managed devfreq_register_notifier() | |
1420 | * @dev: The devfreq user device. (parent of devfreq) | |
1421 | * @devfreq: The devfreq object. | |
1422 | * @nb: The notifier block to be unregistered. | |
1423 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1424 | */ | |
1425 | int devm_devfreq_register_notifier(struct device *dev, | |
1426 | struct devfreq *devfreq, | |
1427 | struct notifier_block *nb, | |
1428 | unsigned int list) | |
1429 | { | |
1430 | struct devfreq_notifier_devres *ptr; | |
1431 | int ret; | |
1432 | ||
1433 | ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr), | |
1434 | GFP_KERNEL); | |
1435 | if (!ptr) | |
1436 | return -ENOMEM; | |
1437 | ||
1438 | ret = devfreq_register_notifier(devfreq, nb, list); | |
1439 | if (ret) { | |
1440 | devres_free(ptr); | |
1441 | return ret; | |
1442 | } | |
1443 | ||
1444 | ptr->devfreq = devfreq; | |
1445 | ptr->nb = nb; | |
1446 | ptr->list = list; | |
1447 | devres_add(dev, ptr); | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | EXPORT_SYMBOL(devm_devfreq_register_notifier); | |
1452 | ||
1453 | /** | |
1454 | * devm_devfreq_unregister_notifier() | |
1455 | - Resource-managed devfreq_unregister_notifier() | |
1456 | * @dev: The devfreq user device. (parent of devfreq) | |
1457 | * @devfreq: The devfreq object. | |
1458 | * @nb: The notifier block to be unregistered. | |
1459 | * @list: DEVFREQ_TRANSITION_NOTIFIER. | |
1460 | */ | |
1461 | void devm_devfreq_unregister_notifier(struct device *dev, | |
1462 | struct devfreq *devfreq, | |
1463 | struct notifier_block *nb, | |
1464 | unsigned int list) | |
1465 | { | |
1466 | WARN_ON(devres_release(dev, devm_devfreq_notifier_release, | |
1467 | devm_devfreq_dev_match, devfreq)); | |
1468 | } | |
1469 | EXPORT_SYMBOL(devm_devfreq_unregister_notifier); |