Lines Matching full:devfreq
3 * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework
21 #include <linux/devfreq.h>
32 #include <trace/events/devfreq.h>
40 * devfreq core provides delayed work based load monitoring helper
46 /* The list of all device-devfreq governors */
48 /* The list of all device-devfreq */
58 * find_device_devfreq() - find devfreq struct using device pointer
59 * @dev: device pointer used to lookup device devfreq.
62 * devfreq info. devfreq_list_lock should be held by the caller.
64 static struct devfreq *find_device_devfreq(struct device *dev) in find_device_devfreq()
66 struct devfreq *tmp_devfreq; in find_device_devfreq()
71 pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); in find_device_devfreq()
83 static unsigned long find_available_min_freq(struct devfreq *devfreq) in find_available_min_freq() argument
88 opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); in find_available_min_freq()
97 static unsigned long find_available_max_freq(struct devfreq *devfreq) in find_available_max_freq() argument
102 opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); in find_available_max_freq()
113 * @devfreq: the devfreq instance
119 static void get_freq_range(struct devfreq *devfreq, in get_freq_range() argument
123 unsigned long *freq_table = devfreq->profile->freq_table; in get_freq_range()
126 lockdep_assert_held(&devfreq->lock); in get_freq_range()
130 * The devfreq drivers can initialize this in either ascending or in get_freq_range()
131 * descending order and devfreq core supports both. in get_freq_range()
133 if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { in get_freq_range()
135 *max_freq = freq_table[devfreq->profile->max_state - 1]; in get_freq_range()
137 *min_freq = freq_table[devfreq->profile->max_state - 1]; in get_freq_range()
142 qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent, in get_freq_range()
144 qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent, in get_freq_range()
152 *min_freq = max(*min_freq, devfreq->scaling_min_freq); in get_freq_range()
153 *max_freq = min(*max_freq, devfreq->scaling_max_freq); in get_freq_range()
161 * @devfreq: the devfreq instance
164 static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) in devfreq_get_freq_level() argument
168 for (lev = 0; lev < devfreq->profile->max_state; lev++) in devfreq_get_freq_level()
169 if (freq == devfreq->profile->freq_table[lev]) in devfreq_get_freq_level()
175 static int set_freq_table(struct devfreq *devfreq) in set_freq_table() argument
177 struct devfreq_dev_profile *profile = devfreq->profile; in set_freq_table()
183 count = dev_pm_opp_get_opp_count(devfreq->dev.parent); in set_freq_table()
188 profile->freq_table = devm_kcalloc(devfreq->dev.parent, in set_freq_table()
198 opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); in set_freq_table()
200 devm_kfree(devfreq->dev.parent, profile->freq_table); in set_freq_table()
212 * devfreq_update_status() - Update statistics of devfreq behavior
213 * @devfreq: the devfreq instance
216 int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) in devfreq_update_status() argument
221 lockdep_assert_held(&devfreq->lock); in devfreq_update_status()
225 if (!devfreq->previous_freq) in devfreq_update_status()
228 prev_lev = devfreq_get_freq_level(devfreq, devfreq->previous_freq); in devfreq_update_status()
234 devfreq->stats.time_in_state[prev_lev] += in devfreq_update_status()
235 cur_time - devfreq->stats.last_update; in devfreq_update_status()
237 lev = devfreq_get_freq_level(devfreq, freq); in devfreq_update_status()
244 devfreq->stats.trans_table[ in devfreq_update_status()
245 (prev_lev * devfreq->profile->max_state) + lev]++; in devfreq_update_status()
246 devfreq->stats.total_trans++; in devfreq_update_status()
250 devfreq->stats.last_update = cur_time; in devfreq_update_status()
256 * find_devfreq_governor() - find devfreq governor from name
259 * Search the list of devfreq governors and return the matched
269 pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); in find_devfreq_governor()
286 * Search the list of devfreq governors and request the module and try again
300 pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); in try_then_request_governor()
324 static int devfreq_notify_transition(struct devfreq *devfreq, in devfreq_notify_transition() argument
327 if (!devfreq) in devfreq_notify_transition()
332 srcu_notifier_call_chain(&devfreq->transition_notifier_list, in devfreq_notify_transition()
337 srcu_notifier_call_chain(&devfreq->transition_notifier_list, in devfreq_notify_transition()
347 static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, in devfreq_set_target() argument
354 if (devfreq->profile->get_cur_freq) in devfreq_set_target()
355 devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); in devfreq_set_target()
357 cur_freq = devfreq->previous_freq; in devfreq_set_target()
361 devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); in devfreq_set_target()
363 err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); in devfreq_set_target()
366 devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); in devfreq_set_target()
371 devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); in devfreq_set_target()
373 if (devfreq_update_status(devfreq, new_freq)) in devfreq_set_target()
374 dev_err(&devfreq->dev, in devfreq_set_target()
377 devfreq->previous_freq = new_freq; in devfreq_set_target()
379 if (devfreq->suspend_freq) in devfreq_set_target()
380 devfreq->resume_freq = new_freq; in devfreq_set_target()
389 * @devfreq: the devfreq instance.
391 * Note: Lock devfreq->lock before calling update_devfreq
394 int update_devfreq(struct devfreq *devfreq) in update_devfreq() argument
400 lockdep_assert_held(&devfreq->lock); in update_devfreq()
402 if (!devfreq->governor) in update_devfreq()
406 err = devfreq->governor->get_target_freq(devfreq, &freq); in update_devfreq()
409 get_freq_range(devfreq, &min_freq, &max_freq); in update_devfreq()
420 return devfreq_set_target(devfreq, freq, flags); in update_devfreq()
426 * devfreq_monitor() - Periodically poll devfreq objects.
433 struct devfreq *devfreq = container_of(work, in devfreq_monitor() local
434 struct devfreq, work.work); in devfreq_monitor()
436 mutex_lock(&devfreq->lock); in devfreq_monitor()
437 err = update_devfreq(devfreq); in devfreq_monitor()
439 dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); in devfreq_monitor()
441 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor()
442 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor()
443 mutex_unlock(&devfreq->lock); in devfreq_monitor()
445 trace_devfreq_monitor(devfreq); in devfreq_monitor()
449 * devfreq_monitor_start() - Start load monitoring of devfreq instance
450 * @devfreq: the devfreq instance.
452 * Helper function for starting devfreq device load monitoring. By
455 * event when device is added to devfreq framework.
457 void devfreq_monitor_start(struct devfreq *devfreq) in devfreq_monitor_start() argument
459 if (devfreq->governor->interrupt_driven) in devfreq_monitor_start()
462 switch (devfreq->profile->timer) { in devfreq_monitor_start()
464 INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); in devfreq_monitor_start()
467 INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); in devfreq_monitor_start()
473 if (devfreq->profile->polling_ms) in devfreq_monitor_start()
474 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor_start()
475 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor_start()
480 * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance
481 * @devfreq: the devfreq instance.
483 * Helper function to stop devfreq device load monitoring. Function
485 * event when device is removed from devfreq framework.
487 void devfreq_monitor_stop(struct devfreq *devfreq) in devfreq_monitor_stop() argument
489 if (devfreq->governor->interrupt_driven) in devfreq_monitor_stop()
492 cancel_delayed_work_sync(&devfreq->work); in devfreq_monitor_stop()
497 * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance
498 * @devfreq: the devfreq instance.
500 * Helper function to suspend devfreq device load monitoring. Function
508 void devfreq_monitor_suspend(struct devfreq *devfreq) in devfreq_monitor_suspend() argument
510 mutex_lock(&devfreq->lock); in devfreq_monitor_suspend()
511 if (devfreq->stop_polling) { in devfreq_monitor_suspend()
512 mutex_unlock(&devfreq->lock); in devfreq_monitor_suspend()
516 devfreq_update_status(devfreq, devfreq->previous_freq); in devfreq_monitor_suspend()
517 devfreq->stop_polling = true; in devfreq_monitor_suspend()
518 mutex_unlock(&devfreq->lock); in devfreq_monitor_suspend()
520 if (devfreq->governor->interrupt_driven) in devfreq_monitor_suspend()
523 cancel_delayed_work_sync(&devfreq->work); in devfreq_monitor_suspend()
528 * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance
529 * @devfreq: the devfreq instance.
531 * Helper function to resume devfreq device load monitoring. Function
535 void devfreq_monitor_resume(struct devfreq *devfreq) in devfreq_monitor_resume() argument
539 mutex_lock(&devfreq->lock); in devfreq_monitor_resume()
540 if (!devfreq->stop_polling) in devfreq_monitor_resume()
543 if (devfreq->governor->interrupt_driven) in devfreq_monitor_resume()
546 if (!delayed_work_pending(&devfreq->work) && in devfreq_monitor_resume()
547 devfreq->profile->polling_ms) in devfreq_monitor_resume()
548 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor_resume()
549 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor_resume()
552 devfreq->stats.last_update = get_jiffies_64(); in devfreq_monitor_resume()
553 devfreq->stop_polling = false; in devfreq_monitor_resume()
555 if (devfreq->profile->get_cur_freq && in devfreq_monitor_resume()
556 !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) in devfreq_monitor_resume()
557 devfreq->previous_freq = freq; in devfreq_monitor_resume()
560 mutex_unlock(&devfreq->lock); in devfreq_monitor_resume()
565 * devfreq_update_interval() - Update device devfreq monitoring interval
566 * @devfreq: the devfreq instance.
572 void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) in devfreq_update_interval() argument
574 unsigned int cur_delay = devfreq->profile->polling_ms; in devfreq_update_interval()
577 mutex_lock(&devfreq->lock); in devfreq_update_interval()
578 devfreq->profile->polling_ms = new_delay; in devfreq_update_interval()
580 if (devfreq->stop_polling) in devfreq_update_interval()
583 if (devfreq->governor->interrupt_driven) in devfreq_update_interval()
588 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
589 cancel_delayed_work_sync(&devfreq->work); in devfreq_update_interval()
595 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_update_interval()
596 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_update_interval()
602 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
603 cancel_delayed_work_sync(&devfreq->work); in devfreq_update_interval()
604 mutex_lock(&devfreq->lock); in devfreq_update_interval()
605 if (!devfreq->stop_polling) in devfreq_update_interval()
606 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_update_interval()
607 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_update_interval()
610 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
616 * has been changed out of devfreq framework.
617 * @nb: the notifier_block (supposed to be devfreq->nb)
621 * Called by a notifier that uses devfreq->nb.
626 struct devfreq *devfreq = container_of(nb, struct devfreq, nb); in devfreq_notifier_call() local
629 mutex_lock(&devfreq->lock); in devfreq_notifier_call()
631 devfreq->scaling_min_freq = find_available_min_freq(devfreq); in devfreq_notifier_call()
632 if (!devfreq->scaling_min_freq) in devfreq_notifier_call()
635 devfreq->scaling_max_freq = find_available_max_freq(devfreq); in devfreq_notifier_call()
636 if (!devfreq->scaling_max_freq) { in devfreq_notifier_call()
637 devfreq->scaling_max_freq = ULONG_MAX; in devfreq_notifier_call()
641 err = update_devfreq(devfreq); in devfreq_notifier_call()
644 mutex_unlock(&devfreq->lock); in devfreq_notifier_call()
646 dev_err(devfreq->dev.parent, in devfreq_notifier_call()
655 * @devfreq: the devfreq instance.
657 static int qos_notifier_call(struct devfreq *devfreq) in qos_notifier_call() argument
661 mutex_lock(&devfreq->lock); in qos_notifier_call()
662 err = update_devfreq(devfreq); in qos_notifier_call()
663 mutex_unlock(&devfreq->lock); in qos_notifier_call()
665 dev_err(devfreq->dev.parent, in qos_notifier_call()
674 * @nb: Should be devfreq->nb_min
679 return qos_notifier_call(container_of(nb, struct devfreq, nb_min)); in qos_min_notifier_call()
684 * @nb: Should be devfreq->nb_max
689 return qos_notifier_call(container_of(nb, struct devfreq, nb_max)); in qos_max_notifier_call()
694 * @dev: the devfreq device
696 * Remove devfreq from the list and release its resources.
700 struct devfreq *devfreq = to_devfreq(dev); in devfreq_dev_release() local
704 list_del(&devfreq->node); in devfreq_dev_release()
707 err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max, in devfreq_dev_release()
712 err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min, in devfreq_dev_release()
718 if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) { in devfreq_dev_release()
719 err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); in devfreq_dev_release()
724 if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) { in devfreq_dev_release()
725 err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); in devfreq_dev_release()
731 if (devfreq->profile->exit) in devfreq_dev_release()
732 devfreq->profile->exit(devfreq->dev.parent); in devfreq_dev_release()
734 mutex_destroy(&devfreq->lock); in devfreq_dev_release()
735 kfree(devfreq); in devfreq_dev_release()
739 * devfreq_add_device() - Add devfreq feature to the device
740 * @dev: the device to add devfreq feature.
741 * @profile: device-specific profile to run devfreq.
743 * @data: private data for the governor. The devfreq framework does not
746 struct devfreq *devfreq_add_device(struct device *dev, in devfreq_add_device()
751 struct devfreq *devfreq; in devfreq_add_device() local
761 devfreq = find_device_devfreq(dev); in devfreq_add_device()
763 if (!IS_ERR(devfreq)) { in devfreq_add_device()
764 dev_err(dev, "%s: devfreq device already exists!\n", in devfreq_add_device()
770 devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); in devfreq_add_device()
771 if (!devfreq) { in devfreq_add_device()
776 mutex_init(&devfreq->lock); in devfreq_add_device()
777 mutex_lock(&devfreq->lock); in devfreq_add_device()
778 devfreq->dev.parent = dev; in devfreq_add_device()
779 devfreq->dev.class = devfreq_class; in devfreq_add_device()
780 devfreq->dev.release = devfreq_dev_release; in devfreq_add_device()
781 INIT_LIST_HEAD(&devfreq->node); in devfreq_add_device()
782 devfreq->profile = profile; in devfreq_add_device()
783 strscpy(devfreq->governor_name, governor_name, DEVFREQ_NAME_LEN); in devfreq_add_device()
784 devfreq->previous_freq = profile->initial_freq; in devfreq_add_device()
785 devfreq->last_status.current_frequency = profile->initial_freq; in devfreq_add_device()
786 devfreq->data = data; in devfreq_add_device()
787 devfreq->nb.notifier_call = devfreq_notifier_call; in devfreq_add_device()
789 if (devfreq->profile->timer < 0 in devfreq_add_device()
790 || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { in devfreq_add_device()
791 mutex_unlock(&devfreq->lock); in devfreq_add_device()
796 if (!devfreq->profile->max_state && !devfreq->profile->freq_table) { in devfreq_add_device()
797 mutex_unlock(&devfreq->lock); in devfreq_add_device()
798 err = set_freq_table(devfreq); in devfreq_add_device()
801 mutex_lock(&devfreq->lock); in devfreq_add_device()
804 devfreq->scaling_min_freq = find_available_min_freq(devfreq); in devfreq_add_device()
805 if (!devfreq->scaling_min_freq) { in devfreq_add_device()
806 mutex_unlock(&devfreq->lock); in devfreq_add_device()
811 devfreq->scaling_max_freq = find_available_max_freq(devfreq); in devfreq_add_device()
812 if (!devfreq->scaling_max_freq) { in devfreq_add_device()
813 mutex_unlock(&devfreq->lock); in devfreq_add_device()
818 devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); in devfreq_add_device()
819 atomic_set(&devfreq->suspend_count, 0); in devfreq_add_device()
821 dev_set_name(&devfreq->dev, "%s", dev_name(dev)); in devfreq_add_device()
822 err = device_register(&devfreq->dev); in devfreq_add_device()
824 mutex_unlock(&devfreq->lock); in devfreq_add_device()
825 put_device(&devfreq->dev); in devfreq_add_device()
829 devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, in devfreq_add_device()
831 devfreq->profile->max_state, in devfreq_add_device()
832 devfreq->profile->max_state), in devfreq_add_device()
834 if (!devfreq->stats.trans_table) { in devfreq_add_device()
835 mutex_unlock(&devfreq->lock); in devfreq_add_device()
840 devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, in devfreq_add_device()
841 devfreq->profile->max_state, in devfreq_add_device()
842 sizeof(*devfreq->stats.time_in_state), in devfreq_add_device()
844 if (!devfreq->stats.time_in_state) { in devfreq_add_device()
845 mutex_unlock(&devfreq->lock); in devfreq_add_device()
850 devfreq->stats.total_trans = 0; in devfreq_add_device()
851 devfreq->stats.last_update = get_jiffies_64(); in devfreq_add_device()
853 srcu_init_notifier_head(&devfreq->transition_notifier_list); in devfreq_add_device()
855 mutex_unlock(&devfreq->lock); in devfreq_add_device()
857 err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, in devfreq_add_device()
861 err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, in devfreq_add_device()
867 devfreq->nb_min.notifier_call = qos_min_notifier_call; in devfreq_add_device()
868 err = dev_pm_qos_add_notifier(devfreq->dev.parent, &devfreq->nb_min, in devfreq_add_device()
873 devfreq->nb_max.notifier_call = qos_max_notifier_call; in devfreq_add_device()
874 err = dev_pm_qos_add_notifier(devfreq->dev.parent, &devfreq->nb_max, in devfreq_add_device()
881 governor = try_then_request_governor(devfreq->governor_name); in devfreq_add_device()
889 devfreq->governor = governor; in devfreq_add_device()
890 err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, in devfreq_add_device()
898 list_add(&devfreq->node, &devfreq_list); in devfreq_add_device()
902 return devfreq; in devfreq_add_device()
907 devfreq_remove_device(devfreq); in devfreq_add_device()
908 devfreq = NULL; in devfreq_add_device()
910 kfree(devfreq); in devfreq_add_device()
917 * devfreq_remove_device() - Remove devfreq feature from a device.
918 * @devfreq: the devfreq instance to be removed
922 int devfreq_remove_device(struct devfreq *devfreq) in devfreq_remove_device() argument
924 if (!devfreq) in devfreq_remove_device()
927 if (devfreq->governor) in devfreq_remove_device()
928 devfreq->governor->event_handler(devfreq, in devfreq_remove_device()
930 device_unregister(&devfreq->dev); in devfreq_remove_device()
938 struct devfreq **r = res; in devm_devfreq_dev_match()
948 devfreq_remove_device(*(struct devfreq **)res); in devm_devfreq_dev_release()
953 * @dev: the device to add devfreq feature.
954 * @profile: device-specific profile to run devfreq.
956 * @data: private data for the governor. The devfreq framework does not
959 * This function manages automatically the memory of devfreq device using device
960 * resource management and simplify the free operation for memory of devfreq
963 struct devfreq *devm_devfreq_add_device(struct device *dev, in devm_devfreq_add_device()
968 struct devfreq **ptr, *devfreq; in devm_devfreq_add_device() local
974 devfreq = devfreq_add_device(dev, profile, governor_name, data); in devm_devfreq_add_device()
975 if (IS_ERR(devfreq)) { in devm_devfreq_add_device()
977 return devfreq; in devm_devfreq_add_device()
980 *ptr = devfreq; in devm_devfreq_add_device()
983 return devfreq; in devm_devfreq_add_device()
989 * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree
992 * return the instance of devfreq device
994 struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) in devfreq_get_devfreq_by_node()
996 struct devfreq *devfreq; in devfreq_get_devfreq_by_node() local
1002 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_get_devfreq_by_node()
1003 if (devfreq->dev.parent in devfreq_get_devfreq_by_node()
1004 && devfreq->dev.parent->of_node == node) { in devfreq_get_devfreq_by_node()
1006 return devfreq; in devfreq_get_devfreq_by_node()
1015 * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
1018 * @index - index into list of devfreq
1020 * return the instance of devfreq device
1022 struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, in devfreq_get_devfreq_by_phandle()
1026 struct devfreq *devfreq; in devfreq_get_devfreq_by_phandle() local
1038 devfreq = devfreq_get_devfreq_by_node(node); in devfreq_get_devfreq_by_phandle()
1041 return devfreq; in devfreq_get_devfreq_by_phandle()
1045 struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) in devfreq_get_devfreq_by_node()
1050 struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, in devfreq_get_devfreq_by_phandle()
1061 * @dev: the device from which to remove devfreq feature.
1062 * @devfreq: the devfreq instance to be removed
1064 void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) in devm_devfreq_remove_device() argument
1067 devm_devfreq_dev_match, devfreq)); in devm_devfreq_remove_device()
1072 * devfreq_suspend_device() - Suspend devfreq of a device.
1073 * @devfreq: the devfreq instance to be suspended
1077 * holds the devfreq.
1079 int devfreq_suspend_device(struct devfreq *devfreq) in devfreq_suspend_device() argument
1083 if (!devfreq) in devfreq_suspend_device()
1086 if (atomic_inc_return(&devfreq->suspend_count) > 1) in devfreq_suspend_device()
1089 if (devfreq->governor) { in devfreq_suspend_device()
1090 ret = devfreq->governor->event_handler(devfreq, in devfreq_suspend_device()
1096 if (devfreq->suspend_freq) { in devfreq_suspend_device()
1097 mutex_lock(&devfreq->lock); in devfreq_suspend_device()
1098 ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); in devfreq_suspend_device()
1099 mutex_unlock(&devfreq->lock); in devfreq_suspend_device()
1109 * devfreq_resume_device() - Resume devfreq of a device.
1110 * @devfreq: the devfreq instance to be resumed
1114 * holds the devfreq.
1116 int devfreq_resume_device(struct devfreq *devfreq) in devfreq_resume_device() argument
1120 if (!devfreq) in devfreq_resume_device()
1123 if (atomic_dec_return(&devfreq->suspend_count) >= 1) in devfreq_resume_device()
1126 if (devfreq->resume_freq) { in devfreq_resume_device()
1127 mutex_lock(&devfreq->lock); in devfreq_resume_device()
1128 ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); in devfreq_resume_device()
1129 mutex_unlock(&devfreq->lock); in devfreq_resume_device()
1134 if (devfreq->governor) { in devfreq_resume_device()
1135 ret = devfreq->governor->event_handler(devfreq, in devfreq_resume_device()
1146 * devfreq_suspend() - Suspend devfreq governors and devices
1149 * and devices preserving the state for resume. On some platforms the devfreq
1155 struct devfreq *devfreq; in devfreq_suspend() local
1159 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_suspend()
1160 ret = devfreq_suspend_device(devfreq); in devfreq_suspend()
1162 dev_err(&devfreq->dev, in devfreq_suspend()
1163 "failed to suspend devfreq device\n"); in devfreq_suspend()
1169 * devfreq_resume() - Resume devfreq governors and devices
1176 struct devfreq *devfreq; in devfreq_resume() local
1180 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_resume()
1181 ret = devfreq_resume_device(devfreq); in devfreq_resume()
1183 dev_warn(&devfreq->dev, in devfreq_resume()
1184 "failed to resume devfreq device\n"); in devfreq_resume()
1190 * devfreq_add_governor() - Add devfreq governor
1191 * @governor: the devfreq governor to be added
1196 struct devfreq *devfreq; in devfreq_add_governor() local
1215 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_add_governor()
1217 struct device *dev = devfreq->dev.parent; in devfreq_add_governor()
1219 if (!strncmp(devfreq->governor_name, governor->name, in devfreq_add_governor()
1222 if (devfreq->governor) { in devfreq_add_governor()
1225 __func__, devfreq->governor->name); in devfreq_add_governor()
1226 ret = devfreq->governor->event_handler(devfreq, in devfreq_add_governor()
1232 devfreq->governor->name, ret); in devfreq_add_governor()
1236 devfreq->governor = governor; in devfreq_add_governor()
1237 ret = devfreq->governor->event_handler(devfreq, in devfreq_add_governor()
1241 __func__, devfreq->governor->name, in devfreq_add_governor()
1255 * devfreq_remove_governor() - Remove devfreq feature from a device.
1256 * @governor: the devfreq governor to be removed
1261 struct devfreq *devfreq; in devfreq_remove_governor() local
1277 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_remove_governor()
1279 struct device *dev = devfreq->dev.parent; in devfreq_remove_governor()
1281 if (!strncmp(devfreq->governor_name, governor->name, in devfreq_remove_governor()
1283 /* we should have a devfreq governor! */ in devfreq_remove_governor()
1284 if (!devfreq->governor) { in devfreq_remove_governor()
1290 ret = devfreq->governor->event_handler(devfreq, in devfreq_remove_governor()
1294 __func__, devfreq->governor->name, in devfreq_remove_governor()
1297 devfreq->governor = NULL; in devfreq_remove_governor()
1312 struct devfreq *df = to_devfreq(dev); in name_show()
1320 struct devfreq *df = to_devfreq(dev); in governor_show()
1331 struct devfreq *df = to_devfreq(dev); in governor_store()
1395 struct devfreq *df = to_devfreq(d); in available_governors_show()
1404 * The devfreq with immutable governor (e.g., passive) shows in available_governors_show()
1411 * The devfreq device shows the registered governor except for in available_governors_show()
1441 struct devfreq *df = to_devfreq(dev); in cur_freq_show()
1457 struct devfreq *df = to_devfreq(dev); in target_freq_show()
1466 struct devfreq *df = to_devfreq(dev); in polling_interval_show()
1478 struct devfreq *df = to_devfreq(dev); in polling_interval_store()
1499 struct devfreq *df = to_devfreq(dev); in min_freq_store()
1526 struct devfreq *df = to_devfreq(dev); in min_freq_show()
1540 struct devfreq *df = to_devfreq(dev); in max_freq_store()
1580 struct devfreq *df = to_devfreq(dev); in max_freq_show()
1595 struct devfreq *df = to_devfreq(d); in available_frequencies_show()
1622 struct devfreq *df = to_devfreq(dev); in trans_stat_show()
1676 struct devfreq *df = to_devfreq(dev); in trans_stat_store()
1706 struct devfreq *df = to_devfreq(dev); in timer_show()
1717 struct devfreq *df = to_devfreq(dev); in timer_store()
1780 ATTRIBUTE_GROUPS(devfreq);
1783 * devfreq_summary_show() - Show the summary of the devfreq devices
1784 * @s: seq_file instance to show the summary of devfreq devices
1787 * Show the summary of the devfreq devices via 'devfreq_summary' debugfs file.
1788 * It helps that user can know the detailed information of the devfreq devices.
1794 struct devfreq *devfreq; in devfreq_summary_show() local
1795 struct devfreq *p_devfreq = NULL; in devfreq_summary_show()
1821 list_for_each_entry_reverse(devfreq, &devfreq_list, node) { in devfreq_summary_show()
1823 if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, in devfreq_summary_show()
1825 struct devfreq_passive_data *data = devfreq->data; in devfreq_summary_show()
1834 mutex_lock(&devfreq->lock); in devfreq_summary_show()
1835 cur_freq = devfreq->previous_freq; in devfreq_summary_show()
1836 get_freq_range(devfreq, &min_freq, &max_freq); in devfreq_summary_show()
1837 polling_ms = devfreq->profile->polling_ms; in devfreq_summary_show()
1838 timer = devfreq->profile->timer; in devfreq_summary_show()
1839 mutex_unlock(&devfreq->lock); in devfreq_summary_show()
1843 dev_name(&devfreq->dev), in devfreq_summary_show()
1845 devfreq->governor_name, in devfreq_summary_show()
1861 devfreq_class = class_create(THIS_MODULE, "devfreq"); in devfreq_init()
1875 devfreq_debugfs = debugfs_create_dir("devfreq", NULL); in devfreq_init()
1885 * The following are helper functions for devfreq user device drivers with
1892 * @dev: The devfreq user device. (parent of devfreq)
1894 * @flags: Flags handed from devfreq framework.
1926 * devfreq_register_opp_notifier() - Helper function to get devfreq notified
1929 * @dev: The devfreq user device. (parent of devfreq)
1930 * @devfreq: The devfreq object.
1932 int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) in devfreq_register_opp_notifier() argument
1934 return dev_pm_opp_register_notifier(dev, &devfreq->nb); in devfreq_register_opp_notifier()
1939 * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
1942 * @dev: The devfreq user device. (parent of devfreq)
1943 * @devfreq: The devfreq object.
1948 int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) in devfreq_unregister_opp_notifier() argument
1950 return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); in devfreq_unregister_opp_notifier()
1956 devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); in devm_devfreq_opp_release()
1962 * @dev: The devfreq user device. (parent of devfreq)
1963 * @devfreq: The devfreq object.
1966 struct devfreq *devfreq) in devm_devfreq_register_opp_notifier() argument
1968 struct devfreq **ptr; in devm_devfreq_register_opp_notifier()
1975 ret = devfreq_register_opp_notifier(dev, devfreq); in devm_devfreq_register_opp_notifier()
1981 *ptr = devfreq; in devm_devfreq_register_opp_notifier()
1991 * @dev: The devfreq user device. (parent of devfreq)
1992 * @devfreq: The devfreq object.
1995 struct devfreq *devfreq) in devm_devfreq_unregister_opp_notifier() argument
1998 devm_devfreq_dev_match, devfreq)); in devm_devfreq_unregister_opp_notifier()
2003 * devfreq_register_notifier() - Register a driver with devfreq
2004 * @devfreq: The devfreq object.
2008 int devfreq_register_notifier(struct devfreq *devfreq, in devfreq_register_notifier() argument
2014 if (!devfreq) in devfreq_register_notifier()
2020 &devfreq->transition_notifier_list, nb); in devfreq_register_notifier()
2031 * devfreq_unregister_notifier() - Unregister a driver with devfreq
2032 * @devfreq: The devfreq object.
2036 int devfreq_unregister_notifier(struct devfreq *devfreq, in devfreq_unregister_notifier() argument
2042 if (!devfreq) in devfreq_unregister_notifier()
2048 &devfreq->transition_notifier_list, nb); in devfreq_unregister_notifier()
2059 struct devfreq *devfreq; member
2068 devfreq_unregister_notifier(this->devfreq, this->nb, this->list); in devm_devfreq_notifier_release()
2074 * @dev: The devfreq user device. (parent of devfreq)
2075 * @devfreq: The devfreq object.
2080 struct devfreq *devfreq, in devm_devfreq_register_notifier() argument
2092 ret = devfreq_register_notifier(devfreq, nb, list); in devm_devfreq_register_notifier()
2098 ptr->devfreq = devfreq; in devm_devfreq_register_notifier()
2110 * @dev: The devfreq user device. (parent of devfreq)
2111 * @devfreq: The devfreq object.
2116 struct devfreq *devfreq, in devm_devfreq_unregister_notifier() argument
2121 devm_devfreq_dev_match, devfreq)); in devm_devfreq_unregister_notifier()