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drivers/devfreq/devfreq.c devfreq_list devfreq_list_lock find_device_devfreq() - find devfreq struct using device pointer. devfreq_get_freq_level() - Lookup freq_table for the frequency. struct devfreq: time_in_state: statistics for how many time spent on the specific state. last_stat_updated: record in which time the state being updated. total_trans: total number of devfreq transitions. trans_table: it is more like a two-dimensional array, which record devfreq transitions of from which old state to which target state. something like: 0...maxstate,0...maxstate ... 0...maxstate 0 1 maxstate min_freq:minimum frequency max_freq:maximum frequency work:the delayed work struct variable used for polling stop_polling:devfreq polling status of a device, which will be used for function devfreq_monitor_suspend/resume function to indicate if the devfreq have been stop polling, if being suspend then stop_polling is true which means that polling have been stoped and if stop_polling is false which means that polling have been resumed and it can be stopped again. the default value should be false. data: private data for governors governor_name: the name of governor used with this devfreq governor: method how to choose frequency based on the usage, which is the devfreq using governor. profile: device-specific devfreq profile, which the devfreq using profile node: used as a node in devfreq_list lock: a mutex dev: device register by devfreq class. dev.parent is the device using devfreq previous_freq: previously configured frequency value, which is configure as the profile' initial_freq defaultly. nb: assign nb.notifier_call as devfreq_notifier_call update_devfreq() - Reevaluate the device and configure frequency. devfreq_governor: get_target_freq: return desired operating frequency for the device. event_handler: callback for devfreq core framework to notify events to governors. Events include per device governor init and exit, opp changes out of devfreq, suspend and resume. devfreq_monitor() - Periodically poll devfreq objects. devfreq_monitor_start() - Start load monitoring of devfreq instance. devfreq_monitor_stop() - Stop load monitoring of a devfreq instance. devfreq_monitor_suspend() - Suspend load monitoring of a devfreq instance devfreq_monitor_resume() - Resume load monitoring of a devfreq instance devfreq_interval_update() - Update device devfreq monitoring interval devfreq_notifier_call() - Notify that the device frequency requirements devfreq_notifier_call() - Notify that the device frequency requirements has been changed out of devfreq framework. _remove_devfreq() - Remove devfreq from the list and release its resources. devfreq_dev_release() - Callback for struct device to release the device. devfreq_add_device() - Add devfreq feature to the device struct devfreq *devfreq_add_device(struct device *dev, struct devfreq_dev_profile *profile, const char *governor_name, void *data) devfreq_remove_device() - Remove devfreq feature from a device. devm_devfreq_add_device() - Resource-managed devfreq_add_device() devm_devfreq_remove_device() - Resource-managed devfreq_remove_device() devfreq_suspend_device() - Suspend devfreq of a device. devfreq_resume_device() - Resume devfreq of a device. devfreq_add_governor() - Add devfreq governor devfreq_remove_device() - Remove devfreq feature from a device. governor_show/governor_store/available_governors_show/cur_freq_show/target_freq_show/polling_interval_show/polling_interval_store/min_freq_store/min_freq_show/ max_freq_show/max_freq_store/available_frequencies_show/trans_stat_show转载地址：http://lkuun.baihongyu.com/