Lines Matching full:devfreq
3 * devfreq: Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework
22 #include <linux/devfreq.h>
34 #include <trace/events/devfreq.h>
43 * devfreq core provides delayed work based load monitoring helper
49 /* The list of all device-devfreq governors */
51 /* The list of all device-devfreq */
61 * find_device_devfreq() - find devfreq struct using device pointer
62 * @dev: device pointer used to lookup device devfreq.
65 * devfreq info. devfreq_list_lock should be held by the caller.
67 static struct devfreq *find_device_devfreq(struct device *dev) in find_device_devfreq()
69 struct devfreq *tmp_devfreq; in find_device_devfreq()
74 pr_err("DEVFREQ: %s: Invalid parameters\n", __func__); in find_device_devfreq()
86 static unsigned long find_available_min_freq(struct devfreq *devfreq) in find_available_min_freq() argument
91 opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); in find_available_min_freq()
100 static unsigned long find_available_max_freq(struct devfreq *devfreq) in find_available_max_freq() argument
105 opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); in find_available_max_freq()
116 * @devfreq: the devfreq instance
122 void devfreq_get_freq_range(struct devfreq *devfreq, in devfreq_get_freq_range() argument
126 unsigned long *freq_table = devfreq->freq_table; in devfreq_get_freq_range()
129 lockdep_assert_held(&devfreq->lock); in devfreq_get_freq_range()
133 * The devfreq drivers can initialize this in either ascending or in devfreq_get_freq_range()
134 * descending order and devfreq core supports both. in devfreq_get_freq_range()
136 if (freq_table[0] < freq_table[devfreq->max_state - 1]) { in devfreq_get_freq_range()
138 *max_freq = freq_table[devfreq->max_state - 1]; in devfreq_get_freq_range()
140 *min_freq = freq_table[devfreq->max_state - 1]; in devfreq_get_freq_range()
145 qos_min_freq = dev_pm_qos_read_value(devfreq->dev.parent, in devfreq_get_freq_range()
147 qos_max_freq = dev_pm_qos_read_value(devfreq->dev.parent, in devfreq_get_freq_range()
155 *min_freq = max(*min_freq, devfreq->scaling_min_freq); in devfreq_get_freq_range()
156 *max_freq = min(*max_freq, devfreq->scaling_max_freq); in devfreq_get_freq_range()
165 * @devfreq: the devfreq instance
168 static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) in devfreq_get_freq_level() argument
172 for (lev = 0; lev < devfreq->max_state; lev++) in devfreq_get_freq_level()
173 if (freq == devfreq->freq_table[lev]) in devfreq_get_freq_level()
179 static int set_freq_table(struct devfreq *devfreq) in set_freq_table() argument
186 count = dev_pm_opp_get_opp_count(devfreq->dev.parent); in set_freq_table()
190 devfreq->max_state = count; in set_freq_table()
191 devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, in set_freq_table()
192 devfreq->max_state, in set_freq_table()
193 sizeof(*devfreq->freq_table), in set_freq_table()
195 if (!devfreq->freq_table) in set_freq_table()
198 for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { in set_freq_table()
199 opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); in set_freq_table()
201 devm_kfree(devfreq->dev.parent, devfreq->freq_table); in set_freq_table()
205 devfreq->freq_table[i] = freq; 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->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()
373 * change order of between devfreq device and passive devfreq device. in devfreq_set_target()
376 trace_devfreq_frequency(devfreq, new_freq, cur_freq); in devfreq_set_target()
379 devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); in devfreq_set_target()
381 if (devfreq_update_status(devfreq, new_freq)) in devfreq_set_target()
382 dev_warn(&devfreq->dev, in devfreq_set_target()
385 devfreq->previous_freq = new_freq; in devfreq_set_target()
387 if (devfreq->suspend_freq) in devfreq_set_target()
388 devfreq->resume_freq = new_freq; in devfreq_set_target()
396 * @devfreq: the devfreq instance.
398 * is only used for devfreq device using passive governor.
400 * Note: Lock devfreq->lock before calling devfreq_update_target. This function
401 * should be only used by both update_devfreq() and devfreq governors.
403 int devfreq_update_target(struct devfreq *devfreq, unsigned long freq) in devfreq_update_target() argument
409 lockdep_assert_held(&devfreq->lock); in devfreq_update_target()
411 if (!devfreq->governor) in devfreq_update_target()
415 err = devfreq->governor->get_target_freq(devfreq, &freq); in devfreq_update_target()
418 devfreq_get_freq_range(devfreq, &min_freq, &max_freq); in devfreq_update_target()
429 return devfreq_set_target(devfreq, freq, flags); in devfreq_update_target()
437 * @devfreq: the devfreq instance.
439 * Note: Lock devfreq->lock before calling update_devfreq
442 int update_devfreq(struct devfreq *devfreq) in update_devfreq() argument
444 return devfreq_update_target(devfreq, 0L); in update_devfreq()
449 * devfreq_monitor() - Periodically poll devfreq objects.
456 struct devfreq *devfreq = container_of(work, in devfreq_monitor() local
457 struct devfreq, work.work); in devfreq_monitor()
459 mutex_lock(&devfreq->lock); in devfreq_monitor()
460 err = update_devfreq(devfreq); in devfreq_monitor()
462 dev_err(&devfreq->dev, "dvfs failed with (%d) error\n", err); in devfreq_monitor()
464 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor()
465 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor()
466 mutex_unlock(&devfreq->lock); in devfreq_monitor()
468 trace_devfreq_monitor(devfreq); in devfreq_monitor()
472 * devfreq_monitor_start() - Start load monitoring of devfreq instance
473 * @devfreq: the devfreq instance.
475 * Helper function for starting devfreq device load monitoring. By
478 * event when device is added to devfreq framework.
480 void devfreq_monitor_start(struct devfreq *devfreq) in devfreq_monitor_start() argument
482 if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) in devfreq_monitor_start()
485 switch (devfreq->profile->timer) { in devfreq_monitor_start()
487 INIT_DEFERRABLE_WORK(&devfreq->work, devfreq_monitor); in devfreq_monitor_start()
490 INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); in devfreq_monitor_start()
496 if (devfreq->profile->polling_ms) in devfreq_monitor_start()
497 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor_start()
498 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor_start()
503 * devfreq_monitor_stop() - Stop load monitoring of a devfreq instance
504 * @devfreq: the devfreq instance.
506 * Helper function to stop devfreq device load monitoring. Function
508 * event when device is removed from devfreq framework.
510 void devfreq_monitor_stop(struct devfreq *devfreq) in devfreq_monitor_stop() argument
512 if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) in devfreq_monitor_stop()
515 cancel_delayed_work_sync(&devfreq->work); in devfreq_monitor_stop()
520 * devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance
521 * @devfreq: the devfreq instance.
523 * Helper function to suspend devfreq device load monitoring. Function
531 void devfreq_monitor_suspend(struct devfreq *devfreq) in devfreq_monitor_suspend() argument
533 mutex_lock(&devfreq->lock); in devfreq_monitor_suspend()
534 if (devfreq->stop_polling) { in devfreq_monitor_suspend()
535 mutex_unlock(&devfreq->lock); in devfreq_monitor_suspend()
539 devfreq_update_status(devfreq, devfreq->previous_freq); in devfreq_monitor_suspend()
540 devfreq->stop_polling = true; in devfreq_monitor_suspend()
541 mutex_unlock(&devfreq->lock); in devfreq_monitor_suspend()
543 if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) in devfreq_monitor_suspend()
546 cancel_delayed_work_sync(&devfreq->work); in devfreq_monitor_suspend()
551 * devfreq_monitor_resume() - Resume load monitoring of a devfreq instance
552 * @devfreq: the devfreq instance.
554 * Helper function to resume devfreq device load monitoring. Function
558 void devfreq_monitor_resume(struct devfreq *devfreq) in devfreq_monitor_resume() argument
562 mutex_lock(&devfreq->lock); in devfreq_monitor_resume()
564 if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) in devfreq_monitor_resume()
567 if (!devfreq->stop_polling) in devfreq_monitor_resume()
570 if (!delayed_work_pending(&devfreq->work) && in devfreq_monitor_resume()
571 devfreq->profile->polling_ms) in devfreq_monitor_resume()
572 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_monitor_resume()
573 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_monitor_resume()
576 devfreq->stats.last_update = get_jiffies_64(); in devfreq_monitor_resume()
577 devfreq->stop_polling = false; in devfreq_monitor_resume()
579 if (devfreq->profile->get_cur_freq && in devfreq_monitor_resume()
580 !devfreq->profile->get_cur_freq(devfreq->dev.parent, &freq)) in devfreq_monitor_resume()
581 devfreq->previous_freq = freq; in devfreq_monitor_resume()
584 mutex_unlock(&devfreq->lock); in devfreq_monitor_resume()
589 * devfreq_update_interval() - Update device devfreq monitoring interval
590 * @devfreq: the devfreq instance.
596 void devfreq_update_interval(struct devfreq *devfreq, unsigned int *delay) in devfreq_update_interval() argument
598 unsigned int cur_delay = devfreq->profile->polling_ms; in devfreq_update_interval()
601 mutex_lock(&devfreq->lock); in devfreq_update_interval()
602 devfreq->profile->polling_ms = new_delay; in devfreq_update_interval()
604 if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) in devfreq_update_interval()
607 if (devfreq->stop_polling) in devfreq_update_interval()
612 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
613 cancel_delayed_work_sync(&devfreq->work); in devfreq_update_interval()
619 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_update_interval()
620 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_update_interval()
626 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
627 cancel_delayed_work_sync(&devfreq->work); in devfreq_update_interval()
628 mutex_lock(&devfreq->lock); in devfreq_update_interval()
629 if (!devfreq->stop_polling) in devfreq_update_interval()
630 queue_delayed_work(devfreq_wq, &devfreq->work, in devfreq_update_interval()
631 msecs_to_jiffies(devfreq->profile->polling_ms)); in devfreq_update_interval()
634 mutex_unlock(&devfreq->lock); in devfreq_update_interval()
640 * has been changed out of devfreq framework.
641 * @nb: the notifier_block (supposed to be devfreq->nb)
645 * Called by a notifier that uses devfreq->nb.
650 struct devfreq *devfreq = container_of(nb, struct devfreq, nb); in devfreq_notifier_call() local
653 mutex_lock(&devfreq->lock); in devfreq_notifier_call()
655 devfreq->scaling_min_freq = find_available_min_freq(devfreq); in devfreq_notifier_call()
656 if (!devfreq->scaling_min_freq) in devfreq_notifier_call()
659 devfreq->scaling_max_freq = find_available_max_freq(devfreq); in devfreq_notifier_call()
660 if (!devfreq->scaling_max_freq) { in devfreq_notifier_call()
661 devfreq->scaling_max_freq = ULONG_MAX; in devfreq_notifier_call()
665 err = update_devfreq(devfreq); in devfreq_notifier_call()
668 mutex_unlock(&devfreq->lock); in devfreq_notifier_call()
670 dev_err(devfreq->dev.parent, in devfreq_notifier_call()
679 * @devfreq: the devfreq instance.
681 static int qos_notifier_call(struct devfreq *devfreq) in qos_notifier_call() argument
685 mutex_lock(&devfreq->lock); in qos_notifier_call()
686 err = update_devfreq(devfreq); in qos_notifier_call()
687 mutex_unlock(&devfreq->lock); in qos_notifier_call()
689 dev_err(devfreq->dev.parent, in qos_notifier_call()
698 * @nb: Should be devfreq->nb_min
705 return qos_notifier_call(container_of(nb, struct devfreq, nb_min)); in qos_min_notifier_call()
710 * @nb: Should be devfreq->nb_max
717 return qos_notifier_call(container_of(nb, struct devfreq, nb_max)); in qos_max_notifier_call()
722 * @dev: the devfreq device
724 * Remove devfreq from the list and release its resources.
728 struct devfreq *devfreq = to_devfreq(dev); in devfreq_dev_release() local
732 list_del(&devfreq->node); in devfreq_dev_release()
735 err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_max, in devfreq_dev_release()
740 err = dev_pm_qos_remove_notifier(devfreq->dev.parent, &devfreq->nb_min, in devfreq_dev_release()
746 if (dev_pm_qos_request_active(&devfreq->user_max_freq_req)) { in devfreq_dev_release()
747 err = dev_pm_qos_remove_request(&devfreq->user_max_freq_req); in devfreq_dev_release()
752 if (dev_pm_qos_request_active(&devfreq->user_min_freq_req)) { in devfreq_dev_release()
753 err = dev_pm_qos_remove_request(&devfreq->user_min_freq_req); in devfreq_dev_release()
759 if (devfreq->profile->exit) in devfreq_dev_release()
760 devfreq->profile->exit(devfreq->dev.parent); in devfreq_dev_release()
762 if (devfreq->opp_table) in devfreq_dev_release()
763 dev_pm_opp_put_opp_table(devfreq->opp_table); in devfreq_dev_release()
765 mutex_destroy(&devfreq->lock); in devfreq_dev_release()
766 kfree(devfreq); in devfreq_dev_release()
769 static void create_sysfs_files(struct devfreq *devfreq,
771 static void remove_sysfs_files(struct devfreq *devfreq,
775 * devfreq_add_device() - Add devfreq feature to the device
776 * @dev: the device to add devfreq feature.
777 * @profile: device-specific profile to run devfreq.
779 * @data: private data for the governor. The devfreq framework does not
782 struct devfreq *devfreq_add_device(struct device *dev, in devfreq_add_device()
787 struct devfreq *devfreq; in devfreq_add_device() local
798 devfreq = find_device_devfreq(dev); in devfreq_add_device()
800 if (!IS_ERR(devfreq)) { in devfreq_add_device()
801 dev_err(dev, "%s: devfreq device already exists!\n", in devfreq_add_device()
807 devfreq = kzalloc(sizeof(struct devfreq), GFP_KERNEL); in devfreq_add_device()
808 if (!devfreq) { in devfreq_add_device()
813 mutex_init(&devfreq->lock); in devfreq_add_device()
814 mutex_lock(&devfreq->lock); in devfreq_add_device()
815 devfreq->dev.parent = dev; in devfreq_add_device()
816 devfreq->dev.class = devfreq_class; in devfreq_add_device()
817 devfreq->dev.release = devfreq_dev_release; in devfreq_add_device()
818 INIT_LIST_HEAD(&devfreq->node); in devfreq_add_device()
819 devfreq->profile = profile; in devfreq_add_device()
820 devfreq->previous_freq = profile->initial_freq; in devfreq_add_device()
821 devfreq->last_status.current_frequency = profile->initial_freq; in devfreq_add_device()
822 devfreq->data = data; in devfreq_add_device()
823 devfreq->nb.notifier_call = devfreq_notifier_call; in devfreq_add_device()
825 if (devfreq->profile->timer < 0 in devfreq_add_device()
826 || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { in devfreq_add_device()
827 mutex_unlock(&devfreq->lock); in devfreq_add_device()
832 if (!devfreq->profile->max_state || !devfreq->profile->freq_table) { in devfreq_add_device()
833 mutex_unlock(&devfreq->lock); in devfreq_add_device()
834 err = set_freq_table(devfreq); in devfreq_add_device()
837 mutex_lock(&devfreq->lock); in devfreq_add_device()
839 devfreq->freq_table = devfreq->profile->freq_table; in devfreq_add_device()
840 devfreq->max_state = devfreq->profile->max_state; in devfreq_add_device()
843 devfreq->scaling_min_freq = find_available_min_freq(devfreq); in devfreq_add_device()
844 if (!devfreq->scaling_min_freq) { in devfreq_add_device()
845 mutex_unlock(&devfreq->lock); in devfreq_add_device()
850 devfreq->scaling_max_freq = find_available_max_freq(devfreq); in devfreq_add_device()
851 if (!devfreq->scaling_max_freq) { in devfreq_add_device()
852 mutex_unlock(&devfreq->lock); in devfreq_add_device()
857 devfreq_get_freq_range(devfreq, &min_freq, &max_freq); in devfreq_add_device()
859 devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); in devfreq_add_device()
860 devfreq->opp_table = dev_pm_opp_get_opp_table(dev); in devfreq_add_device()
861 if (IS_ERR(devfreq->opp_table)) in devfreq_add_device()
862 devfreq->opp_table = NULL; in devfreq_add_device()
864 atomic_set(&devfreq->suspend_count, 0); in devfreq_add_device()
866 dev_set_name(&devfreq->dev, "%s", dev_name(dev)); in devfreq_add_device()
867 err = device_register(&devfreq->dev); in devfreq_add_device()
869 mutex_unlock(&devfreq->lock); in devfreq_add_device()
870 put_device(&devfreq->dev); in devfreq_add_device()
874 devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, in devfreq_add_device()
876 devfreq->max_state, in devfreq_add_device()
877 devfreq->max_state), in devfreq_add_device()
879 if (!devfreq->stats.trans_table) { in devfreq_add_device()
880 mutex_unlock(&devfreq->lock); in devfreq_add_device()
885 devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, in devfreq_add_device()
886 devfreq->max_state, in devfreq_add_device()
887 sizeof(*devfreq->stats.time_in_state), in devfreq_add_device()
889 if (!devfreq->stats.time_in_state) { in devfreq_add_device()
890 mutex_unlock(&devfreq->lock); in devfreq_add_device()
895 devfreq->stats.total_trans = 0; in devfreq_add_device()
896 devfreq->stats.last_update = get_jiffies_64(); in devfreq_add_device()
898 srcu_init_notifier_head(&devfreq->transition_notifier_list); in devfreq_add_device()
900 mutex_unlock(&devfreq->lock); in devfreq_add_device()
902 err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, in devfreq_add_device()
906 err = dev_pm_qos_add_request(dev, &devfreq->user_max_freq_req, in devfreq_add_device()
912 devfreq->nb_min.notifier_call = qos_min_notifier_call; in devfreq_add_device()
913 err = dev_pm_qos_add_notifier(dev, &devfreq->nb_min, in devfreq_add_device()
918 devfreq->nb_max.notifier_call = qos_max_notifier_call; in devfreq_add_device()
919 err = dev_pm_qos_add_notifier(dev, &devfreq->nb_max, in devfreq_add_device()
934 devfreq->governor = governor; in devfreq_add_device()
935 err = devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_START, in devfreq_add_device()
943 create_sysfs_files(devfreq, devfreq->governor); in devfreq_add_device()
945 list_add(&devfreq->node, &devfreq_list); in devfreq_add_device()
949 if (devfreq->profile->is_cooling_device) { in devfreq_add_device()
950 devfreq->cdev = devfreq_cooling_em_register(devfreq, NULL); in devfreq_add_device()
951 if (IS_ERR(devfreq->cdev)) in devfreq_add_device()
952 devfreq->cdev = NULL; in devfreq_add_device()
955 return devfreq; in devfreq_add_device()
960 devfreq_remove_device(devfreq); in devfreq_add_device()
961 devfreq = NULL; in devfreq_add_device()
963 kfree(devfreq); in devfreq_add_device()
970 * devfreq_remove_device() - Remove devfreq feature from a device.
971 * @devfreq: the devfreq instance to be removed
975 int devfreq_remove_device(struct devfreq *devfreq) in devfreq_remove_device() argument
977 if (!devfreq) in devfreq_remove_device()
980 devfreq_cooling_unregister(devfreq->cdev); in devfreq_remove_device()
982 if (devfreq->governor) { in devfreq_remove_device()
983 devfreq->governor->event_handler(devfreq, in devfreq_remove_device()
985 remove_sysfs_files(devfreq, devfreq->governor); in devfreq_remove_device()
988 device_unregister(&devfreq->dev); in devfreq_remove_device()
996 struct devfreq **r = res; in devm_devfreq_dev_match()
1006 devfreq_remove_device(*(struct devfreq **)res); in devm_devfreq_dev_release()
1011 * @dev: the device to add devfreq feature.
1012 * @profile: device-specific profile to run devfreq.
1014 * @data: private data for the governor. The devfreq framework does not
1017 * This function manages automatically the memory of devfreq device using device
1018 * resource management and simplify the free operation for memory of devfreq
1021 struct devfreq *devm_devfreq_add_device(struct device *dev, in devm_devfreq_add_device()
1026 struct devfreq **ptr, *devfreq; in devm_devfreq_add_device() local
1032 devfreq = devfreq_add_device(dev, profile, governor_name, data); in devm_devfreq_add_device()
1033 if (IS_ERR(devfreq)) { in devm_devfreq_add_device()
1035 return devfreq; in devm_devfreq_add_device()
1038 *ptr = devfreq; in devm_devfreq_add_device()
1041 return devfreq; in devm_devfreq_add_device()
1047 * devfreq_get_devfreq_by_node - Get the devfreq device from devicetree
1050 * return the instance of devfreq device
1052 struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) in devfreq_get_devfreq_by_node()
1054 struct devfreq *devfreq; in devfreq_get_devfreq_by_node() local
1060 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_get_devfreq_by_node()
1061 if (devfreq->dev.parent in devfreq_get_devfreq_by_node()
1062 && devfreq->dev.parent->of_node == node) { in devfreq_get_devfreq_by_node()
1064 return devfreq; in devfreq_get_devfreq_by_node()
1073 * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
1076 * @index - index into list of devfreq
1078 * return the instance of devfreq device
1080 struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, in devfreq_get_devfreq_by_phandle()
1084 struct devfreq *devfreq; in devfreq_get_devfreq_by_phandle() local
1096 devfreq = devfreq_get_devfreq_by_node(node); in devfreq_get_devfreq_by_phandle()
1099 return devfreq; in devfreq_get_devfreq_by_phandle()
1103 struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node) in devfreq_get_devfreq_by_node()
1108 struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, in devfreq_get_devfreq_by_phandle()
1119 * @dev: the device from which to remove devfreq feature.
1120 * @devfreq: the devfreq instance to be removed
1122 void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq) in devm_devfreq_remove_device() argument
1125 devm_devfreq_dev_match, devfreq)); in devm_devfreq_remove_device()
1130 * devfreq_suspend_device() - Suspend devfreq of a device.
1131 * @devfreq: the devfreq instance to be suspended
1135 * holds the devfreq.
1137 int devfreq_suspend_device(struct devfreq *devfreq) in devfreq_suspend_device() argument
1141 if (!devfreq) in devfreq_suspend_device()
1144 if (atomic_inc_return(&devfreq->suspend_count) > 1) in devfreq_suspend_device()
1147 if (devfreq->governor) { in devfreq_suspend_device()
1148 ret = devfreq->governor->event_handler(devfreq, in devfreq_suspend_device()
1154 if (devfreq->suspend_freq) { in devfreq_suspend_device()
1155 mutex_lock(&devfreq->lock); in devfreq_suspend_device()
1156 ret = devfreq_set_target(devfreq, devfreq->suspend_freq, 0); in devfreq_suspend_device()
1157 mutex_unlock(&devfreq->lock); in devfreq_suspend_device()
1167 * devfreq_resume_device() - Resume devfreq of a device.
1168 * @devfreq: the devfreq instance to be resumed
1172 * holds the devfreq.
1174 int devfreq_resume_device(struct devfreq *devfreq) in devfreq_resume_device() argument
1178 if (!devfreq) in devfreq_resume_device()
1181 if (atomic_dec_return(&devfreq->suspend_count) >= 1) in devfreq_resume_device()
1184 if (devfreq->resume_freq) { in devfreq_resume_device()
1185 mutex_lock(&devfreq->lock); in devfreq_resume_device()
1186 ret = devfreq_set_target(devfreq, devfreq->resume_freq, 0); in devfreq_resume_device()
1187 mutex_unlock(&devfreq->lock); in devfreq_resume_device()
1192 if (devfreq->governor) { in devfreq_resume_device()
1193 ret = devfreq->governor->event_handler(devfreq, in devfreq_resume_device()
1204 * devfreq_suspend() - Suspend devfreq governors and devices
1207 * and devices preserving the state for resume. On some platforms the devfreq
1213 struct devfreq *devfreq; in devfreq_suspend() local
1217 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_suspend()
1218 ret = devfreq_suspend_device(devfreq); in devfreq_suspend()
1220 dev_err(&devfreq->dev, in devfreq_suspend()
1221 "failed to suspend devfreq device\n"); in devfreq_suspend()
1227 * devfreq_resume() - Resume devfreq governors and devices
1234 struct devfreq *devfreq; in devfreq_resume() local
1238 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_resume()
1239 ret = devfreq_resume_device(devfreq); in devfreq_resume()
1241 dev_warn(&devfreq->dev, in devfreq_resume()
1242 "failed to resume devfreq device\n"); in devfreq_resume()
1248 * devfreq_add_governor() - Add devfreq governor
1249 * @governor: the devfreq governor to be added
1254 struct devfreq *devfreq; in devfreq_add_governor() local
1273 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_add_governor()
1275 struct device *dev = devfreq->dev.parent; in devfreq_add_governor()
1277 if (!strncmp(devfreq->governor->name, governor->name, in devfreq_add_governor()
1280 if (devfreq->governor) { in devfreq_add_governor()
1283 __func__, devfreq->governor->name); in devfreq_add_governor()
1284 ret = devfreq->governor->event_handler(devfreq, in devfreq_add_governor()
1290 devfreq->governor->name, ret); in devfreq_add_governor()
1294 devfreq->governor = governor; in devfreq_add_governor()
1295 ret = devfreq->governor->event_handler(devfreq, in devfreq_add_governor()
1299 __func__, devfreq->governor->name, in devfreq_add_governor()
1318 * devm_devfreq_add_governor() - Add devfreq governor
1319 * @dev: device which adds devfreq governor
1320 * @governor: the devfreq governor to be added
1339 * devfreq_remove_governor() - Remove devfreq feature from a device.
1340 * @governor: the devfreq governor to be removed
1345 struct devfreq *devfreq; in devfreq_remove_governor() local
1361 list_for_each_entry(devfreq, &devfreq_list, node) { in devfreq_remove_governor()
1363 struct device *dev = devfreq->dev.parent; in devfreq_remove_governor()
1365 if (!strncmp(devfreq->governor->name, governor->name, in devfreq_remove_governor()
1367 /* we should have a devfreq governor! */ in devfreq_remove_governor()
1368 if (!devfreq->governor) { in devfreq_remove_governor()
1374 ret = devfreq->governor->event_handler(devfreq, in devfreq_remove_governor()
1378 __func__, devfreq->governor->name, in devfreq_remove_governor()
1381 devfreq->governor = NULL; in devfreq_remove_governor()
1396 struct devfreq *df = to_devfreq(dev); in name_show()
1404 struct devfreq *df = to_devfreq(dev); in governor_show()
1415 struct devfreq *df = to_devfreq(dev); in governor_store()
1496 struct devfreq *df = to_devfreq(d); in available_governors_show()
1505 * The devfreq with immutable governor (e.g., passive) shows in available_governors_show()
1512 * The devfreq device shows the registered governor except for in available_governors_show()
1542 struct devfreq *df = to_devfreq(dev); in cur_freq_show()
1558 struct devfreq *df = to_devfreq(dev); in target_freq_show()
1567 struct devfreq *df = to_devfreq(dev); in min_freq_store()
1594 struct devfreq *df = to_devfreq(dev); in min_freq_show()
1608 struct devfreq *df = to_devfreq(dev); in max_freq_store()
1648 struct devfreq *df = to_devfreq(dev); in max_freq_show()
1663 struct devfreq *df = to_devfreq(d); in available_frequencies_show()
1690 struct devfreq *df = to_devfreq(dev); in trans_stat_show()
1742 struct devfreq *df = to_devfreq(dev); in trans_stat_store()
1781 ATTRIBUTE_GROUPS(devfreq);
1786 struct devfreq *df = to_devfreq(dev); in polling_interval_show()
1798 struct devfreq *df = to_devfreq(dev); in polling_interval_store()
1819 struct devfreq *df = to_devfreq(dev); in timer_show()
1830 struct devfreq *df = to_devfreq(dev); in timer_store()
1890 static void create_sysfs_files(struct devfreq *devfreq, in create_sysfs_files() argument
1894 CREATE_SYSFS_FILE(devfreq, polling_interval); in create_sysfs_files()
1896 CREATE_SYSFS_FILE(devfreq, timer); in create_sysfs_files()
1900 static void remove_sysfs_files(struct devfreq *devfreq, in remove_sysfs_files() argument
1904 sysfs_remove_file(&devfreq->dev.kobj, in remove_sysfs_files()
1907 sysfs_remove_file(&devfreq->dev.kobj, &dev_attr_timer.attr); in remove_sysfs_files()
1911 * devfreq_summary_show() - Show the summary of the devfreq devices
1912 * @s: seq_file instance to show the summary of devfreq devices
1915 * Show the summary of the devfreq devices via 'devfreq_summary' debugfs file.
1916 * It helps that user can know the detailed information of the devfreq devices.
1922 struct devfreq *devfreq; in devfreq_summary_show() local
1923 struct devfreq *p_devfreq = NULL; in devfreq_summary_show()
1949 list_for_each_entry_reverse(devfreq, &devfreq_list, node) { in devfreq_summary_show()
1951 if (!strncmp(devfreq->governor->name, DEVFREQ_GOV_PASSIVE, in devfreq_summary_show()
1953 struct devfreq_passive_data *data = devfreq->data; in devfreq_summary_show()
1962 mutex_lock(&devfreq->lock); in devfreq_summary_show()
1963 cur_freq = devfreq->previous_freq; in devfreq_summary_show()
1964 devfreq_get_freq_range(devfreq, &min_freq, &max_freq); in devfreq_summary_show()
1965 timer = devfreq->profile->timer; in devfreq_summary_show()
1967 if (IS_SUPPORTED_ATTR(devfreq->governor->attrs, POLLING_INTERVAL)) in devfreq_summary_show()
1968 polling_ms = devfreq->profile->polling_ms; in devfreq_summary_show()
1971 mutex_unlock(&devfreq->lock); in devfreq_summary_show()
1975 dev_name(&devfreq->dev), in devfreq_summary_show()
1977 devfreq->governor->name, in devfreq_summary_show()
1993 devfreq_class = class_create(THIS_MODULE, "devfreq"); in devfreq_init()
2007 devfreq_debugfs = debugfs_create_dir("devfreq", NULL); in devfreq_init()
2017 * The following are helper functions for devfreq user device drivers with
2024 * @dev: The devfreq user device. (parent of devfreq)
2026 * @flags: Flags handed from devfreq framework.
2058 * devfreq_register_opp_notifier() - Helper function to get devfreq notified
2061 * @dev: The devfreq user device. (parent of devfreq)
2062 * @devfreq: The devfreq object.
2064 int devfreq_register_opp_notifier(struct device *dev, struct devfreq *devfreq) in devfreq_register_opp_notifier() argument
2066 return dev_pm_opp_register_notifier(dev, &devfreq->nb); in devfreq_register_opp_notifier()
2071 * devfreq_unregister_opp_notifier() - Helper function to stop getting devfreq
2074 * @dev: The devfreq user device. (parent of devfreq)
2075 * @devfreq: The devfreq object.
2080 int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) in devfreq_unregister_opp_notifier() argument
2082 return dev_pm_opp_unregister_notifier(dev, &devfreq->nb); in devfreq_unregister_opp_notifier()
2088 devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res); in devm_devfreq_opp_release()
2094 * @dev: The devfreq user device. (parent of devfreq)
2095 * @devfreq: The devfreq object.
2098 struct devfreq *devfreq) in devm_devfreq_register_opp_notifier() argument
2100 struct devfreq **ptr; in devm_devfreq_register_opp_notifier()
2107 ret = devfreq_register_opp_notifier(dev, devfreq); in devm_devfreq_register_opp_notifier()
2113 *ptr = devfreq; in devm_devfreq_register_opp_notifier()
2123 * @dev: The devfreq user device. (parent of devfreq)
2124 * @devfreq: The devfreq object.
2127 struct devfreq *devfreq) in devm_devfreq_unregister_opp_notifier() argument
2130 devm_devfreq_dev_match, devfreq)); in devm_devfreq_unregister_opp_notifier()
2135 * devfreq_register_notifier() - Register a driver with devfreq
2136 * @devfreq: The devfreq object.
2140 int devfreq_register_notifier(struct devfreq *devfreq, in devfreq_register_notifier() argument
2146 if (!devfreq) in devfreq_register_notifier()
2152 &devfreq->transition_notifier_list, nb); in devfreq_register_notifier()
2163 * devfreq_unregister_notifier() - Unregister a driver with devfreq
2164 * @devfreq: The devfreq object.
2168 int devfreq_unregister_notifier(struct devfreq *devfreq, in devfreq_unregister_notifier() argument
2174 if (!devfreq) in devfreq_unregister_notifier()
2180 &devfreq->transition_notifier_list, nb); in devfreq_unregister_notifier()
2191 struct devfreq *devfreq; member
2200 devfreq_unregister_notifier(this->devfreq, this->nb, this->list); in devm_devfreq_notifier_release()
2206 * @dev: The devfreq user device. (parent of devfreq)
2207 * @devfreq: The devfreq object.
2212 struct devfreq *devfreq, in devm_devfreq_register_notifier() argument
2224 ret = devfreq_register_notifier(devfreq, nb, list); in devm_devfreq_register_notifier()
2230 ptr->devfreq = devfreq; in devm_devfreq_register_notifier()
2242 * @dev: The devfreq user device. (parent of devfreq)
2243 * @devfreq: The devfreq object.
2248 struct devfreq *devfreq, in devm_devfreq_unregister_notifier() argument
2253 devm_devfreq_dev_match, devfreq)); in devm_devfreq_unregister_notifier()