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> | |
952f6d13 | 18 | #include <linux/module.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> | |
28 | #include "governor.h" | |
29 | ||
1a1357ea | 30 | static struct class *devfreq_class; |
a3c98b8b MH |
31 | |
32 | /* | |
7e6fdd4b RV |
33 | * devfreq core provides delayed work based load monitoring helper |
34 | * functions. Governors can use these or can implement their own | |
35 | * monitoring mechanism. | |
a3c98b8b | 36 | */ |
a3c98b8b | 37 | static struct workqueue_struct *devfreq_wq; |
a3c98b8b | 38 | |
3aa173b8 NM |
39 | /* The list of all device-devfreq governors */ |
40 | static LIST_HEAD(devfreq_governor_list); | |
a3c98b8b MH |
41 | /* The list of all device-devfreq */ |
42 | static LIST_HEAD(devfreq_list); | |
43 | static DEFINE_MUTEX(devfreq_list_lock); | |
44 | ||
45 | /** | |
46 | * find_device_devfreq() - find devfreq struct using device pointer | |
47 | * @dev: device pointer used to lookup device devfreq. | |
48 | * | |
49 | * Search the list of device devfreqs and return the matched device's | |
50 | * devfreq info. devfreq_list_lock should be held by the caller. | |
51 | */ | |
52 | static struct devfreq *find_device_devfreq(struct device *dev) | |
53 | { | |
54 | struct devfreq *tmp_devfreq; | |
55 | ||
9348da2f | 56 | if (IS_ERR_OR_NULL(dev)) { |
a3c98b8b MH |
57 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
58 | return ERR_PTR(-EINVAL); | |
59 | } | |
60 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
61 | "devfreq_list_lock must be locked."); | |
62 | ||
63 | list_for_each_entry(tmp_devfreq, &devfreq_list, node) { | |
64 | if (tmp_devfreq->dev.parent == dev) | |
65 | return tmp_devfreq; | |
66 | } | |
67 | ||
68 | return ERR_PTR(-ENODEV); | |
69 | } | |
70 | ||
e552bbaf JL |
71 | /** |
72 | * devfreq_get_freq_level() - Lookup freq_table for the frequency | |
73 | * @devfreq: the devfreq instance | |
74 | * @freq: the target frequency | |
75 | */ | |
76 | static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) | |
77 | { | |
78 | int lev; | |
79 | ||
80 | for (lev = 0; lev < devfreq->profile->max_state; lev++) | |
81 | if (freq == devfreq->profile->freq_table[lev]) | |
82 | return lev; | |
83 | ||
84 | return -EINVAL; | |
85 | } | |
86 | ||
0ec09ac2 CC |
87 | /** |
88 | * devfreq_set_freq_table() - Initialize freq_table for the frequency | |
89 | * @devfreq: the devfreq instance | |
90 | */ | |
91 | static void devfreq_set_freq_table(struct devfreq *devfreq) | |
92 | { | |
93 | struct devfreq_dev_profile *profile = devfreq->profile; | |
94 | struct dev_pm_opp *opp; | |
95 | unsigned long freq; | |
96 | int i, count; | |
97 | ||
98 | /* Initialize the freq_table from OPP table */ | |
99 | count = dev_pm_opp_get_opp_count(devfreq->dev.parent); | |
100 | if (count <= 0) | |
101 | return; | |
102 | ||
103 | profile->max_state = count; | |
104 | profile->freq_table = devm_kcalloc(devfreq->dev.parent, | |
105 | profile->max_state, | |
106 | sizeof(*profile->freq_table), | |
107 | GFP_KERNEL); | |
108 | if (!profile->freq_table) { | |
109 | profile->max_state = 0; | |
110 | return; | |
111 | } | |
112 | ||
113 | rcu_read_lock(); | |
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; | |
119 | rcu_read_unlock(); | |
120 | return; | |
121 | } | |
122 | profile->freq_table[i] = freq; | |
123 | } | |
124 | rcu_read_unlock(); | |
125 | } | |
126 | ||
e552bbaf JL |
127 | /** |
128 | * devfreq_update_status() - Update statistics of devfreq behavior | |
129 | * @devfreq: the devfreq instance | |
130 | * @freq: the update target frequency | |
131 | */ | |
132 | static int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) | |
133 | { | |
e35d35a1 | 134 | int lev, prev_lev, ret = 0; |
e552bbaf JL |
135 | unsigned long cur_time; |
136 | ||
e552bbaf | 137 | cur_time = jiffies; |
e35d35a1 SK |
138 | |
139 | prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); | |
140 | if (prev_lev < 0) { | |
141 | ret = prev_lev; | |
142 | goto out; | |
143 | } | |
144 | ||
145 | devfreq->time_in_state[prev_lev] += | |
e552bbaf | 146 | cur_time - devfreq->last_stat_updated; |
e35d35a1 SK |
147 | |
148 | lev = devfreq_get_freq_level(devfreq, freq); | |
149 | if (lev < 0) { | |
150 | ret = lev; | |
151 | goto out; | |
152 | } | |
153 | ||
154 | if (lev != prev_lev) { | |
e552bbaf JL |
155 | devfreq->trans_table[(prev_lev * |
156 | devfreq->profile->max_state) + lev]++; | |
157 | devfreq->total_trans++; | |
158 | } | |
e552bbaf | 159 | |
e35d35a1 SK |
160 | out: |
161 | devfreq->last_stat_updated = cur_time; | |
162 | return ret; | |
e552bbaf JL |
163 | } |
164 | ||
3aa173b8 NM |
165 | /** |
166 | * find_devfreq_governor() - find devfreq governor from name | |
167 | * @name: name of the governor | |
168 | * | |
169 | * Search the list of devfreq governors and return the matched | |
170 | * governor's pointer. devfreq_list_lock should be held by the caller. | |
171 | */ | |
172 | static struct devfreq_governor *find_devfreq_governor(const char *name) | |
173 | { | |
174 | struct devfreq_governor *tmp_governor; | |
175 | ||
9348da2f | 176 | if (IS_ERR_OR_NULL(name)) { |
3aa173b8 NM |
177 | pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); |
178 | return ERR_PTR(-EINVAL); | |
179 | } | |
180 | WARN(!mutex_is_locked(&devfreq_list_lock), | |
181 | "devfreq_list_lock must be locked."); | |
182 | ||
183 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) { | |
184 | if (!strncmp(tmp_governor->name, name, DEVFREQ_NAME_LEN)) | |
185 | return tmp_governor; | |
186 | } | |
187 | ||
188 | return ERR_PTR(-ENODEV); | |
189 | } | |
190 | ||
7e6fdd4b RV |
191 | /* Load monitoring helper functions for governors use */ |
192 | ||
a3c98b8b MH |
193 | /** |
194 | * update_devfreq() - Reevaluate the device and configure frequency. | |
195 | * @devfreq: the devfreq instance. | |
196 | * | |
197 | * Note: Lock devfreq->lock before calling update_devfreq | |
198 | * This function is exported for governors. | |
199 | */ | |
200 | int update_devfreq(struct devfreq *devfreq) | |
201 | { | |
202 | unsigned long freq; | |
203 | int err = 0; | |
ab5f299f | 204 | u32 flags = 0; |
a3c98b8b MH |
205 | |
206 | if (!mutex_is_locked(&devfreq->lock)) { | |
207 | WARN(true, "devfreq->lock must be locked by the caller.\n"); | |
208 | return -EINVAL; | |
209 | } | |
210 | ||
1b5c1be2 NM |
211 | if (!devfreq->governor) |
212 | return -EINVAL; | |
213 | ||
a3c98b8b MH |
214 | /* Reevaluate the proper frequency */ |
215 | err = devfreq->governor->get_target_freq(devfreq, &freq); | |
216 | if (err) | |
217 | return err; | |
218 | ||
ab5f299f | 219 | /* |
d3b7e174 | 220 | * Adjust the frequency with user freq and QoS. |
ab5f299f | 221 | * |
d3b7e174 JM |
222 | * List from the highest priority |
223 | * max_freq | |
ab5f299f MH |
224 | * min_freq |
225 | */ | |
226 | ||
227 | if (devfreq->min_freq && freq < devfreq->min_freq) { | |
228 | freq = devfreq->min_freq; | |
229 | flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */ | |
230 | } | |
231 | if (devfreq->max_freq && freq > devfreq->max_freq) { | |
232 | freq = devfreq->max_freq; | |
233 | flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ | |
234 | } | |
235 | ||
236 | err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); | |
a3c98b8b MH |
237 | if (err) |
238 | return err; | |
239 | ||
e552bbaf JL |
240 | if (devfreq->profile->freq_table) |
241 | if (devfreq_update_status(devfreq, freq)) | |
242 | dev_err(&devfreq->dev, | |
243 | "Couldn't update frequency transition information.\n"); | |
244 | ||
a3c98b8b MH |
245 | devfreq->previous_freq = freq; |
246 | return err; | |
247 | } | |
2df5021f | 248 | EXPORT_SYMBOL(update_devfreq); |
a3c98b8b | 249 | |
7e6fdd4b RV |
250 | /** |
251 | * devfreq_monitor() - Periodically poll devfreq objects. | |
252 | * @work: the work struct used to run devfreq_monitor periodically. | |
253 | * | |
254 | */ | |
255 | static void devfreq_monitor(struct work_struct *work) | |
256 | { | |
257 | int err; | |
258 | struct devfreq *devfreq = container_of(work, | |
259 | struct devfreq, work.work); | |
260 | ||
261 | mutex_lock(&devfreq->lock); | |
262 | err = update_devfreq(devfreq); | |
263 | if (err) | |
264 | dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); | |
265 | ||
266 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
267 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
268 | mutex_unlock(&devfreq->lock); | |
269 | } | |
270 | ||
271 | /** | |
272 | * devfreq_monitor_start() - Start load monitoring of devfreq instance | |
273 | * @devfreq: the devfreq instance. | |
274 | * | |
275 | * Helper function for starting devfreq device load monitoing. By | |
276 | * default delayed work based monitoring is supported. Function | |
277 | * to be called from governor in response to DEVFREQ_GOV_START | |
278 | * event when device is added to devfreq framework. | |
279 | */ | |
280 | void devfreq_monitor_start(struct devfreq *devfreq) | |
281 | { | |
282 | INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); | |
283 | if (devfreq->profile->polling_ms) | |
284 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
285 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
286 | } | |
6dcdd8e3 | 287 | EXPORT_SYMBOL(devfreq_monitor_start); |
7e6fdd4b RV |
288 | |
289 | /** | |
290 | * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance | |
291 | * @devfreq: the devfreq instance. | |
292 | * | |
293 | * Helper function to stop devfreq device load monitoing. Function | |
294 | * to be called from governor in response to DEVFREQ_GOV_STOP | |
295 | * event when device is removed from devfreq framework. | |
296 | */ | |
297 | void devfreq_monitor_stop(struct devfreq *devfreq) | |
298 | { | |
299 | cancel_delayed_work_sync(&devfreq->work); | |
300 | } | |
6dcdd8e3 | 301 | EXPORT_SYMBOL(devfreq_monitor_stop); |
7e6fdd4b RV |
302 | |
303 | /** | |
304 | * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance | |
305 | * @devfreq: the devfreq instance. | |
306 | * | |
307 | * Helper function to suspend devfreq device load monitoing. Function | |
308 | * to be called from governor in response to DEVFREQ_GOV_SUSPEND | |
309 | * event or when polling interval is set to zero. | |
310 | * | |
311 | * Note: Though this function is same as devfreq_monitor_stop(), | |
312 | * intentionally kept separate to provide hooks for collecting | |
313 | * transition statistics. | |
314 | */ | |
315 | void devfreq_monitor_suspend(struct devfreq *devfreq) | |
316 | { | |
317 | mutex_lock(&devfreq->lock); | |
318 | if (devfreq->stop_polling) { | |
319 | mutex_unlock(&devfreq->lock); | |
320 | return; | |
321 | } | |
322 | ||
39688ce6 | 323 | devfreq_update_status(devfreq, devfreq->previous_freq); |
7e6fdd4b RV |
324 | devfreq->stop_polling = true; |
325 | mutex_unlock(&devfreq->lock); | |
326 | cancel_delayed_work_sync(&devfreq->work); | |
327 | } | |
6dcdd8e3 | 328 | EXPORT_SYMBOL(devfreq_monitor_suspend); |
7e6fdd4b RV |
329 | |
330 | /** | |
331 | * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance | |
332 | * @devfreq: the devfreq instance. | |
333 | * | |
334 | * Helper function to resume devfreq device load monitoing. Function | |
335 | * to be called from governor in response to DEVFREQ_GOV_RESUME | |
336 | * event or when polling interval is set to non-zero. | |
337 | */ | |
338 | void devfreq_monitor_resume(struct devfreq *devfreq) | |
339 | { | |
39688ce6 RV |
340 | unsigned long freq; |
341 | ||
7e6fdd4b RV |
342 | mutex_lock(&devfreq->lock); |
343 | if (!devfreq->stop_polling) | |
344 | goto out; | |
345 | ||
346 | if (!delayed_work_pending(&devfreq->work) && | |
347 | devfreq->profile->polling_ms) | |
348 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
349 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
39688ce6 RV |
350 | |
351 | devfreq->last_stat_updated = jiffies; | |
7e6fdd4b RV |
352 | devfreq->stop_polling = false; |
353 | ||
39688ce6 RV |
354 | if (devfreq->profile->get_cur_freq && |
355 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
356 | devfreq->previous_freq = freq; | |
357 | ||
7e6fdd4b RV |
358 | out: |
359 | mutex_unlock(&devfreq->lock); | |
360 | } | |
6dcdd8e3 | 361 | EXPORT_SYMBOL(devfreq_monitor_resume); |
7e6fdd4b RV |
362 | |
363 | /** | |
364 | * devfreq_interval_update() - Update device devfreq monitoring interval | |
365 | * @devfreq: the devfreq instance. | |
366 | * @delay: new polling interval to be set. | |
367 | * | |
368 | * Helper function to set new load monitoring polling interval. Function | |
369 | * to be called from governor in response to DEVFREQ_GOV_INTERVAL event. | |
370 | */ | |
371 | void devfreq_interval_update(struct devfreq *devfreq, unsigned int *delay) | |
372 | { | |
373 | unsigned int cur_delay = devfreq->profile->polling_ms; | |
374 | unsigned int new_delay = *delay; | |
375 | ||
376 | mutex_lock(&devfreq->lock); | |
377 | devfreq->profile->polling_ms = new_delay; | |
378 | ||
379 | if (devfreq->stop_polling) | |
380 | goto out; | |
381 | ||
382 | /* if new delay is zero, stop polling */ | |
383 | if (!new_delay) { | |
384 | mutex_unlock(&devfreq->lock); | |
385 | cancel_delayed_work_sync(&devfreq->work); | |
386 | return; | |
387 | } | |
388 | ||
389 | /* if current delay is zero, start polling with new delay */ | |
390 | if (!cur_delay) { | |
391 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
392 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
393 | goto out; | |
394 | } | |
395 | ||
396 | /* if current delay is greater than new delay, restart polling */ | |
397 | if (cur_delay > new_delay) { | |
398 | mutex_unlock(&devfreq->lock); | |
399 | cancel_delayed_work_sync(&devfreq->work); | |
400 | mutex_lock(&devfreq->lock); | |
401 | if (!devfreq->stop_polling) | |
402 | queue_delayed_work(devfreq_wq, &devfreq->work, | |
403 | msecs_to_jiffies(devfreq->profile->polling_ms)); | |
404 | } | |
405 | out: | |
406 | mutex_unlock(&devfreq->lock); | |
407 | } | |
6dcdd8e3 | 408 | EXPORT_SYMBOL(devfreq_interval_update); |
a3c98b8b MH |
409 | |
410 | /** | |
411 | * devfreq_notifier_call() - Notify that the device frequency requirements | |
412 | * has been changed out of devfreq framework. | |
c5b4a1c1 NM |
413 | * @nb: the notifier_block (supposed to be devfreq->nb) |
414 | * @type: not used | |
415 | * @devp: not used | |
a3c98b8b MH |
416 | * |
417 | * Called by a notifier that uses devfreq->nb. | |
418 | */ | |
419 | static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type, | |
420 | void *devp) | |
421 | { | |
422 | struct devfreq *devfreq = container_of(nb, struct devfreq, nb); | |
423 | int ret; | |
424 | ||
425 | mutex_lock(&devfreq->lock); | |
426 | ret = update_devfreq(devfreq); | |
427 | mutex_unlock(&devfreq->lock); | |
428 | ||
429 | return ret; | |
430 | } | |
431 | ||
432 | /** | |
7e6fdd4b | 433 | * _remove_devfreq() - Remove devfreq from the list and release its resources. |
a3c98b8b | 434 | * @devfreq: the devfreq struct |
a3c98b8b | 435 | */ |
585fc83e | 436 | static void _remove_devfreq(struct devfreq *devfreq) |
a3c98b8b | 437 | { |
7e6fdd4b RV |
438 | mutex_lock(&devfreq_list_lock); |
439 | if (IS_ERR(find_device_devfreq(devfreq->dev.parent))) { | |
440 | mutex_unlock(&devfreq_list_lock); | |
441 | dev_warn(&devfreq->dev, "releasing devfreq which doesn't exist\n"); | |
a3c98b8b MH |
442 | return; |
443 | } | |
7e6fdd4b RV |
444 | list_del(&devfreq->node); |
445 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 446 | |
1b5c1be2 NM |
447 | if (devfreq->governor) |
448 | devfreq->governor->event_handler(devfreq, | |
449 | DEVFREQ_GOV_STOP, NULL); | |
a3c98b8b MH |
450 | |
451 | if (devfreq->profile->exit) | |
452 | devfreq->profile->exit(devfreq->dev.parent); | |
453 | ||
a3c98b8b | 454 | mutex_destroy(&devfreq->lock); |
a3c98b8b MH |
455 | kfree(devfreq); |
456 | } | |
457 | ||
458 | /** | |
459 | * devfreq_dev_release() - Callback for struct device to release the device. | |
460 | * @dev: the devfreq device | |
461 | * | |
462 | * This calls _remove_devfreq() if _remove_devfreq() is not called. | |
a3c98b8b MH |
463 | */ |
464 | static void devfreq_dev_release(struct device *dev) | |
465 | { | |
466 | struct devfreq *devfreq = to_devfreq(dev); | |
a3c98b8b | 467 | |
585fc83e | 468 | _remove_devfreq(devfreq); |
a3c98b8b MH |
469 | } |
470 | ||
471 | /** | |
472 | * devfreq_add_device() - Add devfreq feature to the device | |
473 | * @dev: the device to add devfreq feature. | |
474 | * @profile: device-specific profile to run devfreq. | |
1b5c1be2 | 475 | * @governor_name: name of the policy to choose frequency. |
a3c98b8b MH |
476 | * @data: private data for the governor. The devfreq framework does not |
477 | * touch this value. | |
478 | */ | |
479 | struct devfreq *devfreq_add_device(struct device *dev, | |
480 | struct devfreq_dev_profile *profile, | |
1b5c1be2 | 481 | const char *governor_name, |
a3c98b8b MH |
482 | void *data) |
483 | { | |
484 | struct devfreq *devfreq; | |
1b5c1be2 | 485 | struct devfreq_governor *governor; |
a3c98b8b MH |
486 | int err = 0; |
487 | ||
1b5c1be2 | 488 | if (!dev || !profile || !governor_name) { |
a3c98b8b MH |
489 | dev_err(dev, "%s: Invalid parameters.\n", __func__); |
490 | return ERR_PTR(-EINVAL); | |
491 | } | |
492 | ||
7e6fdd4b RV |
493 | mutex_lock(&devfreq_list_lock); |
494 | devfreq = find_device_devfreq(dev); | |
495 | mutex_unlock(&devfreq_list_lock); | |
496 | if (!IS_ERR(devfreq)) { | |
497 | dev_err(dev, "%s: Unable to create devfreq for the device. It already has one.\n", __func__); | |
498 | err = -EINVAL; | |
499 | goto err_out; | |
a3c98b8b MH |
500 | } |
501 | ||
502 | devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); | |
503 | if (!devfreq) { | |
504 | dev_err(dev, "%s: Unable to create devfreq for the device\n", | |
505 | __func__); | |
506 | err = -ENOMEM; | |
3f19f08a | 507 | goto err_out; |
a3c98b8b MH |
508 | } |
509 | ||
510 | mutex_init(&devfreq->lock); | |
511 | mutex_lock(&devfreq->lock); | |
512 | devfreq->dev.parent = dev; | |
513 | devfreq->dev.class = devfreq_class; | |
514 | devfreq->dev.release = devfreq_dev_release; | |
515 | devfreq->profile = profile; | |
1b5c1be2 | 516 | strncpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); |
a3c98b8b MH |
517 | devfreq->previous_freq = profile->initial_freq; |
518 | devfreq->data = data; | |
a3c98b8b MH |
519 | devfreq->nb.notifier_call = devfreq_notifier_call; |
520 | ||
0ec09ac2 CC |
521 | if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { |
522 | mutex_unlock(&devfreq->lock); | |
523 | devfreq_set_freq_table(devfreq); | |
524 | mutex_lock(&devfreq->lock); | |
525 | } | |
526 | ||
e552bbaf JL |
527 | devfreq->trans_table = devm_kzalloc(dev, sizeof(unsigned int) * |
528 | devfreq->profile->max_state * | |
529 | devfreq->profile->max_state, | |
530 | GFP_KERNEL); | |
5f25f066 | 531 | devfreq->time_in_state = devm_kzalloc(dev, sizeof(unsigned long) * |
e552bbaf JL |
532 | devfreq->profile->max_state, |
533 | GFP_KERNEL); | |
534 | devfreq->last_stat_updated = jiffies; | |
535 | ||
02aa2a37 | 536 | dev_set_name(&devfreq->dev, "%s", dev_name(dev)); |
a3c98b8b MH |
537 | err = device_register(&devfreq->dev); |
538 | if (err) { | |
539 | put_device(&devfreq->dev); | |
7e6fdd4b | 540 | mutex_unlock(&devfreq->lock); |
6d3cbfa7 | 541 | goto err_out; |
a3c98b8b MH |
542 | } |
543 | ||
a3c98b8b MH |
544 | mutex_unlock(&devfreq->lock); |
545 | ||
a3c98b8b | 546 | mutex_lock(&devfreq_list_lock); |
a3c98b8b MH |
547 | list_add(&devfreq->node, &devfreq_list); |
548 | ||
1b5c1be2 NM |
549 | governor = find_devfreq_governor(devfreq->governor_name); |
550 | if (!IS_ERR(governor)) | |
551 | devfreq->governor = governor; | |
552 | if (devfreq->governor) | |
553 | err = devfreq->governor->event_handler(devfreq, | |
554 | DEVFREQ_GOV_START, NULL); | |
a3c98b8b | 555 | mutex_unlock(&devfreq_list_lock); |
7e6fdd4b RV |
556 | if (err) { |
557 | dev_err(dev, "%s: Unable to start governor for the device\n", | |
558 | __func__); | |
559 | goto err_init; | |
a3c98b8b | 560 | } |
7e6fdd4b | 561 | |
3f19f08a AL |
562 | return devfreq; |
563 | ||
a3c98b8b | 564 | err_init: |
7e6fdd4b | 565 | list_del(&devfreq->node); |
a3c98b8b | 566 | device_unregister(&devfreq->dev); |
a3c98b8b | 567 | kfree(devfreq); |
3f19f08a AL |
568 | err_out: |
569 | return ERR_PTR(err); | |
a3c98b8b | 570 | } |
7e6fdd4b | 571 | EXPORT_SYMBOL(devfreq_add_device); |
a3c98b8b MH |
572 | |
573 | /** | |
574 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
c5b4a1c1 | 575 | * @devfreq: the devfreq instance to be removed |
de9c7394 MH |
576 | * |
577 | * The opposite of devfreq_add_device(). | |
a3c98b8b MH |
578 | */ |
579 | int devfreq_remove_device(struct devfreq *devfreq) | |
580 | { | |
581 | if (!devfreq) | |
582 | return -EINVAL; | |
583 | ||
585fc83e CC |
584 | device_unregister(&devfreq->dev); |
585 | put_device(&devfreq->dev); | |
9f3bdd4f | 586 | |
a3c98b8b MH |
587 | return 0; |
588 | } | |
7e6fdd4b | 589 | EXPORT_SYMBOL(devfreq_remove_device); |
a3c98b8b | 590 | |
8cd84092 CC |
591 | static int devm_devfreq_dev_match(struct device *dev, void *res, void *data) |
592 | { | |
593 | struct devfreq **r = res; | |
594 | ||
595 | if (WARN_ON(!r || !*r)) | |
596 | return 0; | |
597 | ||
598 | return *r == data; | |
599 | } | |
600 | ||
601 | static void devm_devfreq_dev_release(struct device *dev, void *res) | |
602 | { | |
603 | devfreq_remove_device(*(struct devfreq **)res); | |
604 | } | |
605 | ||
606 | /** | |
607 | * devm_devfreq_add_device() - Resource-managed devfreq_add_device() | |
608 | * @dev: the device to add devfreq feature. | |
609 | * @profile: device-specific profile to run devfreq. | |
610 | * @governor_name: name of the policy to choose frequency. | |
611 | * @data: private data for the governor. The devfreq framework does not | |
612 | * touch this value. | |
613 | * | |
614 | * This function manages automatically the memory of devfreq device using device | |
615 | * resource management and simplify the free operation for memory of devfreq | |
616 | * device. | |
617 | */ | |
618 | struct devfreq *devm_devfreq_add_device(struct device *dev, | |
619 | struct devfreq_dev_profile *profile, | |
620 | const char *governor_name, | |
621 | void *data) | |
622 | { | |
623 | struct devfreq **ptr, *devfreq; | |
624 | ||
625 | ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL); | |
626 | if (!ptr) | |
627 | return ERR_PTR(-ENOMEM); | |
628 | ||
629 | devfreq = devfreq_add_device(dev, profile, governor_name, data); | |
630 | if (IS_ERR(devfreq)) { | |
631 | devres_free(ptr); | |
632 | return ERR_PTR(-ENOMEM); | |
633 | } | |
634 | ||
635 | *ptr = devfreq; | |
636 | devres_add(dev, ptr); | |
637 | ||
638 | return devfreq; | |
639 | } | |
640 | EXPORT_SYMBOL(devm_devfreq_add_device); | |
641 | ||
642 | /** | |
643 | * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() | |
644 | * @dev: the device to add devfreq feature. | |
645 | * @devfreq: the devfreq instance to be removed | |
646 | */ | |
647 | void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) | |
648 | { | |
649 | WARN_ON(devres_release(dev, devm_devfreq_dev_release, | |
650 | devm_devfreq_dev_match, devfreq)); | |
651 | } | |
652 | EXPORT_SYMBOL(devm_devfreq_remove_device); | |
653 | ||
206c30cf RV |
654 | /** |
655 | * devfreq_suspend_device() - Suspend devfreq of a device. | |
656 | * @devfreq: the devfreq instance to be suspended | |
de9c7394 MH |
657 | * |
658 | * This function is intended to be called by the pm callbacks | |
659 | * (e.g., runtime_suspend, suspend) of the device driver that | |
660 | * holds the devfreq. | |
206c30cf RV |
661 | */ |
662 | int devfreq_suspend_device(struct devfreq *devfreq) | |
663 | { | |
a3c98b8b MH |
664 | if (!devfreq) |
665 | return -EINVAL; | |
666 | ||
1b5c1be2 NM |
667 | if (!devfreq->governor) |
668 | return 0; | |
669 | ||
206c30cf RV |
670 | return devfreq->governor->event_handler(devfreq, |
671 | DEVFREQ_GOV_SUSPEND, NULL); | |
672 | } | |
673 | EXPORT_SYMBOL(devfreq_suspend_device); | |
674 | ||
675 | /** | |
676 | * devfreq_resume_device() - Resume devfreq of a device. | |
677 | * @devfreq: the devfreq instance to be resumed | |
de9c7394 MH |
678 | * |
679 | * This function is intended to be called by the pm callbacks | |
680 | * (e.g., runtime_resume, resume) of the device driver that | |
681 | * holds the devfreq. | |
206c30cf RV |
682 | */ |
683 | int devfreq_resume_device(struct devfreq *devfreq) | |
684 | { | |
685 | if (!devfreq) | |
686 | return -EINVAL; | |
687 | ||
1b5c1be2 NM |
688 | if (!devfreq->governor) |
689 | return 0; | |
690 | ||
206c30cf RV |
691 | return devfreq->governor->event_handler(devfreq, |
692 | DEVFREQ_GOV_RESUME, NULL); | |
693 | } | |
694 | EXPORT_SYMBOL(devfreq_resume_device); | |
695 | ||
3aa173b8 NM |
696 | /** |
697 | * devfreq_add_governor() - Add devfreq governor | |
698 | * @governor: the devfreq governor to be added | |
699 | */ | |
700 | int devfreq_add_governor(struct devfreq_governor *governor) | |
701 | { | |
702 | struct devfreq_governor *g; | |
1b5c1be2 | 703 | struct devfreq *devfreq; |
3aa173b8 NM |
704 | int err = 0; |
705 | ||
706 | if (!governor) { | |
707 | pr_err("%s: Invalid parameters.\n", __func__); | |
708 | return -EINVAL; | |
709 | } | |
710 | ||
711 | mutex_lock(&devfreq_list_lock); | |
712 | g = find_devfreq_governor(governor->name); | |
713 | if (!IS_ERR(g)) { | |
714 | pr_err("%s: governor %s already registered\n", __func__, | |
715 | g->name); | |
716 | err = -EINVAL; | |
717 | goto err_out; | |
718 | } | |
9f3bdd4f | 719 | |
3aa173b8 NM |
720 | list_add(&governor->node, &devfreq_governor_list); |
721 | ||
1b5c1be2 NM |
722 | list_for_each_entry(devfreq, &devfreq_list, node) { |
723 | int ret = 0; | |
724 | struct device *dev = devfreq->dev.parent; | |
725 | ||
726 | if (!strncmp(devfreq->governor_name, governor->name, | |
727 | DEVFREQ_NAME_LEN)) { | |
728 | /* The following should never occur */ | |
729 | if (devfreq->governor) { | |
730 | dev_warn(dev, | |
731 | "%s: Governor %s already present\n", | |
732 | __func__, devfreq->governor->name); | |
733 | ret = devfreq->governor->event_handler(devfreq, | |
734 | DEVFREQ_GOV_STOP, NULL); | |
735 | if (ret) { | |
736 | dev_warn(dev, | |
737 | "%s: Governor %s stop = %d\n", | |
738 | __func__, | |
739 | devfreq->governor->name, ret); | |
740 | } | |
741 | /* Fall through */ | |
742 | } | |
743 | devfreq->governor = governor; | |
744 | ret = devfreq->governor->event_handler(devfreq, | |
745 | DEVFREQ_GOV_START, NULL); | |
746 | if (ret) { | |
747 | dev_warn(dev, "%s: Governor %s start=%d\n", | |
748 | __func__, devfreq->governor->name, | |
749 | ret); | |
750 | } | |
a3c98b8b MH |
751 | } |
752 | } | |
753 | ||
3aa173b8 NM |
754 | err_out: |
755 | mutex_unlock(&devfreq_list_lock); | |
a3c98b8b | 756 | |
3aa173b8 NM |
757 | return err; |
758 | } | |
759 | EXPORT_SYMBOL(devfreq_add_governor); | |
a3c98b8b | 760 | |
3aa173b8 NM |
761 | /** |
762 | * devfreq_remove_device() - Remove devfreq feature from a device. | |
763 | * @governor: the devfreq governor to be removed | |
764 | */ | |
765 | int devfreq_remove_governor(struct devfreq_governor *governor) | |
766 | { | |
767 | struct devfreq_governor *g; | |
1b5c1be2 | 768 | struct devfreq *devfreq; |
3aa173b8 NM |
769 | int err = 0; |
770 | ||
771 | if (!governor) { | |
772 | pr_err("%s: Invalid parameters.\n", __func__); | |
773 | return -EINVAL; | |
774 | } | |
775 | ||
776 | mutex_lock(&devfreq_list_lock); | |
777 | g = find_devfreq_governor(governor->name); | |
778 | if (IS_ERR(g)) { | |
779 | pr_err("%s: governor %s not registered\n", __func__, | |
b9e1c8e8 | 780 | governor->name); |
f9c08e2a | 781 | err = PTR_ERR(g); |
3aa173b8 NM |
782 | goto err_out; |
783 | } | |
1b5c1be2 NM |
784 | list_for_each_entry(devfreq, &devfreq_list, node) { |
785 | int ret; | |
786 | struct device *dev = devfreq->dev.parent; | |
787 | ||
788 | if (!strncmp(devfreq->governor_name, governor->name, | |
789 | DEVFREQ_NAME_LEN)) { | |
790 | /* we should have a devfreq governor! */ | |
791 | if (!devfreq->governor) { | |
792 | dev_warn(dev, "%s: Governor %s NOT present\n", | |
793 | __func__, governor->name); | |
794 | continue; | |
795 | /* Fall through */ | |
796 | } | |
797 | ret = devfreq->governor->event_handler(devfreq, | |
798 | DEVFREQ_GOV_STOP, NULL); | |
799 | if (ret) { | |
800 | dev_warn(dev, "%s: Governor %s stop=%d\n", | |
801 | __func__, devfreq->governor->name, | |
802 | ret); | |
803 | } | |
804 | devfreq->governor = NULL; | |
805 | } | |
806 | } | |
3aa173b8 NM |
807 | |
808 | list_del(&governor->node); | |
809 | err_out: | |
810 | mutex_unlock(&devfreq_list_lock); | |
811 | ||
812 | return err; | |
a3c98b8b | 813 | } |
3aa173b8 | 814 | EXPORT_SYMBOL(devfreq_remove_governor); |
a3c98b8b | 815 | |
a93d6b0a | 816 | static ssize_t governor_show(struct device *dev, |
9005b650 MH |
817 | struct device_attribute *attr, char *buf) |
818 | { | |
1b5c1be2 NM |
819 | if (!to_devfreq(dev)->governor) |
820 | return -EINVAL; | |
821 | ||
9005b650 MH |
822 | return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name); |
823 | } | |
824 | ||
a93d6b0a | 825 | static ssize_t governor_store(struct device *dev, struct device_attribute *attr, |
0359d1af NM |
826 | const char *buf, size_t count) |
827 | { | |
828 | struct devfreq *df = to_devfreq(dev); | |
829 | int ret; | |
830 | char str_governor[DEVFREQ_NAME_LEN + 1]; | |
831 | struct devfreq_governor *governor; | |
832 | ||
833 | ret = sscanf(buf, "%" __stringify(DEVFREQ_NAME_LEN) "s", str_governor); | |
834 | if (ret != 1) | |
835 | return -EINVAL; | |
836 | ||
837 | mutex_lock(&devfreq_list_lock); | |
838 | governor = find_devfreq_governor(str_governor); | |
839 | if (IS_ERR(governor)) { | |
840 | ret = PTR_ERR(governor); | |
841 | goto out; | |
842 | } | |
14a21e7b TJ |
843 | if (df->governor == governor) { |
844 | ret = 0; | |
0359d1af | 845 | goto out; |
14a21e7b | 846 | } |
0359d1af NM |
847 | |
848 | if (df->governor) { | |
849 | ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL); | |
850 | if (ret) { | |
851 | dev_warn(dev, "%s: Governor %s not stopped(%d)\n", | |
852 | __func__, df->governor->name, ret); | |
853 | goto out; | |
854 | } | |
855 | } | |
856 | df->governor = governor; | |
857 | strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN); | |
858 | ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL); | |
859 | if (ret) | |
860 | dev_warn(dev, "%s: Governor %s not started(%d)\n", | |
861 | __func__, df->governor->name, ret); | |
862 | out: | |
863 | mutex_unlock(&devfreq_list_lock); | |
864 | ||
865 | if (!ret) | |
866 | ret = count; | |
867 | return ret; | |
868 | } | |
a93d6b0a GKH |
869 | static DEVICE_ATTR_RW(governor); |
870 | ||
871 | static ssize_t available_governors_show(struct device *d, | |
872 | struct device_attribute *attr, | |
873 | char *buf) | |
50a5b33e NM |
874 | { |
875 | struct devfreq_governor *tmp_governor; | |
876 | ssize_t count = 0; | |
877 | ||
878 | mutex_lock(&devfreq_list_lock); | |
879 | list_for_each_entry(tmp_governor, &devfreq_governor_list, node) | |
880 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
881 | "%s ", tmp_governor->name); | |
882 | mutex_unlock(&devfreq_list_lock); | |
883 | ||
884 | /* Truncate the trailing space */ | |
885 | if (count) | |
886 | count--; | |
887 | ||
888 | count += sprintf(&buf[count], "\n"); | |
889 | ||
890 | return count; | |
891 | } | |
a93d6b0a | 892 | static DEVICE_ATTR_RO(available_governors); |
0359d1af | 893 | |
a93d6b0a GKH |
894 | static ssize_t cur_freq_show(struct device *dev, struct device_attribute *attr, |
895 | char *buf) | |
7f98a905 RV |
896 | { |
897 | unsigned long freq; | |
898 | struct devfreq *devfreq = to_devfreq(dev); | |
899 | ||
900 | if (devfreq->profile->get_cur_freq && | |
901 | !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) | |
902 | return sprintf(buf, "%lu\n", freq); | |
903 | ||
904 | return sprintf(buf, "%lu\n", devfreq->previous_freq); | |
905 | } | |
a93d6b0a | 906 | static DEVICE_ATTR_RO(cur_freq); |
7f98a905 | 907 | |
a93d6b0a GKH |
908 | static ssize_t target_freq_show(struct device *dev, |
909 | struct device_attribute *attr, char *buf) | |
9005b650 MH |
910 | { |
911 | return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq); | |
912 | } | |
a93d6b0a | 913 | static DEVICE_ATTR_RO(target_freq); |
9005b650 | 914 | |
a93d6b0a | 915 | static ssize_t polling_interval_show(struct device *dev, |
9005b650 MH |
916 | struct device_attribute *attr, char *buf) |
917 | { | |
918 | return sprintf(buf, "%d\n", to_devfreq(dev)->profile->polling_ms); | |
919 | } | |
920 | ||
a93d6b0a | 921 | static ssize_t polling_interval_store(struct device *dev, |
9005b650 MH |
922 | struct device_attribute *attr, |
923 | const char *buf, size_t count) | |
924 | { | |
925 | struct devfreq *df = to_devfreq(dev); | |
926 | unsigned int value; | |
927 | int ret; | |
928 | ||
1b5c1be2 NM |
929 | if (!df->governor) |
930 | return -EINVAL; | |
931 | ||
9005b650 MH |
932 | ret = sscanf(buf, "%u", &value); |
933 | if (ret != 1) | |
12e26265 | 934 | return -EINVAL; |
9005b650 | 935 | |
7e6fdd4b | 936 | df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value); |
9005b650 MH |
937 | ret = count; |
938 | ||
9005b650 MH |
939 | return ret; |
940 | } | |
a93d6b0a | 941 | static DEVICE_ATTR_RW(polling_interval); |
9005b650 | 942 | |
a93d6b0a | 943 | static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
944 | const char *buf, size_t count) |
945 | { | |
946 | struct devfreq *df = to_devfreq(dev); | |
947 | unsigned long value; | |
948 | int ret; | |
949 | unsigned long max; | |
950 | ||
951 | ret = sscanf(buf, "%lu", &value); | |
952 | if (ret != 1) | |
12e26265 | 953 | return -EINVAL; |
6530b9de MH |
954 | |
955 | mutex_lock(&df->lock); | |
956 | max = df->max_freq; | |
957 | if (value && max && value > max) { | |
958 | ret = -EINVAL; | |
959 | goto unlock; | |
960 | } | |
961 | ||
962 | df->min_freq = value; | |
963 | update_devfreq(df); | |
964 | ret = count; | |
965 | unlock: | |
966 | mutex_unlock(&df->lock); | |
6530b9de MH |
967 | return ret; |
968 | } | |
969 | ||
a93d6b0a | 970 | static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr, |
6530b9de MH |
971 | const char *buf, size_t count) |
972 | { | |
973 | struct devfreq *df = to_devfreq(dev); | |
974 | unsigned long value; | |
975 | int ret; | |
976 | unsigned long min; | |
977 | ||
978 | ret = sscanf(buf, "%lu", &value); | |
979 | if (ret != 1) | |
12e26265 | 980 | return -EINVAL; |
6530b9de MH |
981 | |
982 | mutex_lock(&df->lock); | |
983 | min = df->min_freq; | |
984 | if (value && min && value < min) { | |
985 | ret = -EINVAL; | |
986 | goto unlock; | |
987 | } | |
988 | ||
989 | df->max_freq = value; | |
990 | update_devfreq(df); | |
991 | ret = count; | |
992 | unlock: | |
993 | mutex_unlock(&df->lock); | |
6530b9de MH |
994 | return ret; |
995 | } | |
996 | ||
3104fa30 CC |
997 | #define show_one(name) \ |
998 | static ssize_t name##_show \ | |
999 | (struct device *dev, struct device_attribute *attr, char *buf) \ | |
1000 | { \ | |
1001 | return sprintf(buf, "%lu\n", to_devfreq(dev)->name); \ | |
6530b9de | 1002 | } |
3104fa30 CC |
1003 | show_one(min_freq); |
1004 | show_one(max_freq); | |
1005 | ||
1006 | static DEVICE_ATTR_RW(min_freq); | |
a93d6b0a | 1007 | static DEVICE_ATTR_RW(max_freq); |
6530b9de | 1008 | |
a93d6b0a GKH |
1009 | static ssize_t available_frequencies_show(struct device *d, |
1010 | struct device_attribute *attr, | |
1011 | char *buf) | |
d287de85 NM |
1012 | { |
1013 | struct devfreq *df = to_devfreq(d); | |
1014 | struct device *dev = df->dev.parent; | |
47d43ba7 | 1015 | struct dev_pm_opp *opp; |
d287de85 NM |
1016 | ssize_t count = 0; |
1017 | unsigned long freq = 0; | |
1018 | ||
1019 | rcu_read_lock(); | |
1020 | do { | |
5d4879cd | 1021 | opp = dev_pm_opp_find_freq_ceil(dev, &freq); |
d287de85 NM |
1022 | if (IS_ERR(opp)) |
1023 | break; | |
1024 | ||
1025 | count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), | |
1026 | "%lu ", freq); | |
1027 | freq++; | |
1028 | } while (1); | |
1029 | rcu_read_unlock(); | |
1030 | ||
1031 | /* Truncate the trailing space */ | |
1032 | if (count) | |
1033 | count--; | |
1034 | ||
1035 | count += sprintf(&buf[count], "\n"); | |
1036 | ||
1037 | return count; | |
1038 | } | |
a93d6b0a | 1039 | static DEVICE_ATTR_RO(available_frequencies); |
d287de85 | 1040 | |
a93d6b0a GKH |
1041 | static ssize_t trans_stat_show(struct device *dev, |
1042 | struct device_attribute *attr, char *buf) | |
e552bbaf JL |
1043 | { |
1044 | struct devfreq *devfreq = to_devfreq(dev); | |
1045 | ssize_t len; | |
39688ce6 | 1046 | int i, j; |
e552bbaf JL |
1047 | unsigned int max_state = devfreq->profile->max_state; |
1048 | ||
39688ce6 RV |
1049 | if (!devfreq->stop_polling && |
1050 | devfreq_update_status(devfreq, devfreq->previous_freq)) | |
e552bbaf | 1051 | return 0; |
34bd3220 MH |
1052 | if (max_state == 0) |
1053 | return sprintf(buf, "Not Supported.\n"); | |
e552bbaf | 1054 | |
d7df1e46 CC |
1055 | len = sprintf(buf, " From : To\n"); |
1056 | len += sprintf(buf + len, " :"); | |
e552bbaf | 1057 | for (i = 0; i < max_state; i++) |
d7df1e46 | 1058 | len += sprintf(buf + len, "%10lu", |
e552bbaf JL |
1059 | devfreq->profile->freq_table[i]); |
1060 | ||
1061 | len += sprintf(buf + len, " time(ms)\n"); | |
1062 | ||
1063 | for (i = 0; i < max_state; i++) { | |
1064 | if (devfreq->profile->freq_table[i] | |
1065 | == devfreq->previous_freq) { | |
1066 | len += sprintf(buf + len, "*"); | |
1067 | } else { | |
1068 | len += sprintf(buf + len, " "); | |
1069 | } | |
d7df1e46 | 1070 | len += sprintf(buf + len, "%10lu:", |
e552bbaf JL |
1071 | devfreq->profile->freq_table[i]); |
1072 | for (j = 0; j < max_state; j++) | |
d7df1e46 | 1073 | len += sprintf(buf + len, "%10u", |
e552bbaf JL |
1074 | devfreq->trans_table[(i * max_state) + j]); |
1075 | len += sprintf(buf + len, "%10u\n", | |
1076 | jiffies_to_msecs(devfreq->time_in_state[i])); | |
1077 | } | |
1078 | ||
1079 | len += sprintf(buf + len, "Total transition : %u\n", | |
1080 | devfreq->total_trans); | |
1081 | return len; | |
1082 | } | |
a93d6b0a GKH |
1083 | static DEVICE_ATTR_RO(trans_stat); |
1084 | ||
1085 | static struct attribute *devfreq_attrs[] = { | |
1086 | &dev_attr_governor.attr, | |
1087 | &dev_attr_available_governors.attr, | |
1088 | &dev_attr_cur_freq.attr, | |
1089 | &dev_attr_available_frequencies.attr, | |
1090 | &dev_attr_target_freq.attr, | |
1091 | &dev_attr_polling_interval.attr, | |
1092 | &dev_attr_min_freq.attr, | |
1093 | &dev_attr_max_freq.attr, | |
1094 | &dev_attr_trans_stat.attr, | |
1095 | NULL, | |
9005b650 | 1096 | }; |
a93d6b0a | 1097 | ATTRIBUTE_GROUPS(devfreq); |
9005b650 | 1098 | |
a3c98b8b MH |
1099 | static int __init devfreq_init(void) |
1100 | { | |
1101 | devfreq_class = class_create(THIS_MODULE, "devfreq"); | |
1102 | if (IS_ERR(devfreq_class)) { | |
1103 | pr_err("%s: couldn't create class\n", __FILE__); | |
1104 | return PTR_ERR(devfreq_class); | |
1105 | } | |
7e6fdd4b RV |
1106 | |
1107 | devfreq_wq = create_freezable_workqueue("devfreq_wq"); | |
ea7f4548 | 1108 | if (!devfreq_wq) { |
7e6fdd4b RV |
1109 | class_destroy(devfreq_class); |
1110 | pr_err("%s: couldn't create workqueue\n", __FILE__); | |
ea7f4548 | 1111 | return -ENOMEM; |
7e6fdd4b | 1112 | } |
a93d6b0a | 1113 | devfreq_class->dev_groups = devfreq_groups; |
7e6fdd4b | 1114 | |
a3c98b8b MH |
1115 | return 0; |
1116 | } | |
1117 | subsys_initcall(devfreq_init); | |
1118 | ||
1119 | static void __exit devfreq_exit(void) | |
1120 | { | |
1121 | class_destroy(devfreq_class); | |
7e6fdd4b | 1122 | destroy_workqueue(devfreq_wq); |
a3c98b8b MH |
1123 | } |
1124 | module_exit(devfreq_exit); | |
1125 | ||
1126 | /* | |
1127 | * The followings are helper functions for devfreq user device drivers with | |
1128 | * OPP framework. | |
1129 | */ | |
1130 | ||
1131 | /** | |
1132 | * devfreq_recommended_opp() - Helper function to get proper OPP for the | |
1133 | * freq value given to target callback. | |
c5b4a1c1 NM |
1134 | * @dev: The devfreq user device. (parent of devfreq) |
1135 | * @freq: The frequency given to target function | |
1136 | * @flags: Flags handed from devfreq framework. | |
a3c98b8b | 1137 | * |
bcb27549 NM |
1138 | * Locking: This function must be called under rcu_read_lock(). opp is a rcu |
1139 | * protected pointer. The reason for the same is that the opp pointer which is | |
1140 | * returned will remain valid for use with opp_get_{voltage, freq} only while | |
1141 | * under the locked area. The pointer returned must be used prior to unlocking | |
1142 | * with rcu_read_unlock() to maintain the integrity of the pointer. | |
a3c98b8b | 1143 | */ |
47d43ba7 NM |
1144 | struct dev_pm_opp *devfreq_recommended_opp(struct device *dev, |
1145 | unsigned long *freq, | |
1146 | u32 flags) | |
a3c98b8b | 1147 | { |
47d43ba7 | 1148 | struct dev_pm_opp *opp; |
a3c98b8b | 1149 | |
ab5f299f MH |
1150 | if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) { |
1151 | /* The freq is an upper bound. opp should be lower */ | |
5d4879cd | 1152 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1153 | |
1154 | /* If not available, use the closest opp */ | |
0779726c | 1155 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1156 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1157 | } else { |
1158 | /* The freq is an lower bound. opp should be higher */ | |
5d4879cd | 1159 | opp = dev_pm_opp_find_freq_ceil(dev, freq); |
ab5f299f MH |
1160 | |
1161 | /* If not available, use the closest opp */ | |
0779726c | 1162 | if (opp == ERR_PTR(-ERANGE)) |
5d4879cd | 1163 | opp = dev_pm_opp_find_freq_floor(dev, freq); |
ab5f299f MH |
1164 | } |
1165 | ||
a3c98b8b MH |
1166 | return opp; |
1167 | } | |
bd7e9277 | 1168 | EXPORT_SYMBOL(devfreq_recommended_opp); |
a3c98b8b MH |
1169 | |
1170 | /** | |
1171 | * devfreq_register_opp_notifier() - Helper function to get devfreq notified | |
1172 | * for any changes in the OPP availability | |
1173 | * changes | |
c5b4a1c1 NM |
1174 | * @dev: The devfreq user device. (parent of devfreq) |
1175 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1176 | */ |
1177 | int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1178 | { | |
389baed0 MH |
1179 | struct srcu_notifier_head *nh; |
1180 | int ret = 0; | |
a3c98b8b | 1181 | |
389baed0 | 1182 | rcu_read_lock(); |
5d4879cd | 1183 | nh = dev_pm_opp_get_notifier(dev); |
a3c98b8b | 1184 | if (IS_ERR(nh)) |
389baed0 MH |
1185 | ret = PTR_ERR(nh); |
1186 | rcu_read_unlock(); | |
1187 | if (!ret) | |
1188 | ret = srcu_notifier_chain_register(nh, &devfreq->nb); | |
1189 | ||
1190 | return ret; | |
a3c98b8b | 1191 | } |
bd7e9277 | 1192 | EXPORT_SYMBOL(devfreq_register_opp_notifier); |
a3c98b8b MH |
1193 | |
1194 | /** | |
1195 | * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq | |
1196 | * notified for any changes in the OPP | |
1197 | * availability changes anymore. | |
c5b4a1c1 NM |
1198 | * @dev: The devfreq user device. (parent of devfreq) |
1199 | * @devfreq: The devfreq object. | |
a3c98b8b MH |
1200 | * |
1201 | * At exit() callback of devfreq_dev_profile, this must be included if | |
1202 | * devfreq_recommended_opp is used. | |
1203 | */ | |
1204 | int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) | |
1205 | { | |
389baed0 MH |
1206 | struct srcu_notifier_head *nh; |
1207 | int ret = 0; | |
a3c98b8b | 1208 | |
389baed0 | 1209 | rcu_read_lock(); |
5d4879cd | 1210 | nh = dev_pm_opp_get_notifier(dev); |
a3c98b8b | 1211 | if (IS_ERR(nh)) |
389baed0 MH |
1212 | ret = PTR_ERR(nh); |
1213 | rcu_read_unlock(); | |
1214 | if (!ret) | |
1215 | ret = srcu_notifier_chain_unregister(nh, &devfreq->nb); | |
1216 | ||
1217 | return ret; | |
a3c98b8b | 1218 | } |
bd7e9277 | 1219 | EXPORT_SYMBOL(devfreq_unregister_opp_notifier); |
a3c98b8b | 1220 | |
d5b040d0 CC |
1221 | static void devm_devfreq_opp_release(struct device *dev, void *res) |
1222 | { | |
1223 | devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * devm_ devfreq_register_opp_notifier() | |
1228 | * - Resource-managed devfreq_register_opp_notifier() | |
1229 | * @dev: The devfreq user device. (parent of devfreq) | |
1230 | * @devfreq: The devfreq object. | |
1231 | */ | |
1232 | int devm_devfreq_register_opp_notifier(struct device *dev, | |
1233 | struct devfreq *devfreq) | |
1234 | { | |
1235 | struct devfreq **ptr; | |
1236 | int ret; | |
1237 | ||
1238 | ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL); | |
1239 | if (!ptr) | |
1240 | return -ENOMEM; | |
1241 | ||
1242 | ret = devfreq_register_opp_notifier(dev, devfreq); | |
1243 | if (ret) { | |
1244 | devres_free(ptr); | |
1245 | return ret; | |
1246 | } | |
1247 | ||
1248 | *ptr = devfreq; | |
1249 | devres_add(dev, ptr); | |
1250 | ||
1251 | return 0; | |
1252 | } | |
1253 | EXPORT_SYMBOL(devm_devfreq_register_opp_notifier); | |
1254 | ||
1255 | /** | |
1256 | * devm_devfreq_unregister_opp_notifier() | |
1257 | * - Resource-managed devfreq_unregister_opp_notifier() | |
1258 | * @dev: The devfreq user device. (parent of devfreq) | |
1259 | * @devfreq: The devfreq object. | |
1260 | */ | |
1261 | void devm_devfreq_unregister_opp_notifier(struct device *dev, | |
1262 | struct devfreq *devfreq) | |
1263 | { | |
1264 | WARN_ON(devres_release(dev, devm_devfreq_opp_release, | |
1265 | devm_devfreq_dev_match, devfreq)); | |
1266 | } | |
1267 | EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier); | |
1268 | ||
a3c98b8b MH |
1269 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
1270 | MODULE_DESCRIPTION("devfreq class support"); | |
1271 | MODULE_LICENSE("GPL"); |