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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201/* SPDX-License-Identifier: GPL-2.0-only *//* * devfreq-event: a framework to provide raw data and events of devfreq devices * * Copyright (C) 2014 Samsung Electronics * Author: Chanwoo Choi <cw00.choi@samsung.com> */
#ifndef __LINUX_DEVFREQ_EVENT_H__#define __LINUX_DEVFREQ_EVENT_H__
#include <linux/device.h>
/** * struct devfreq_event_dev - the devfreq-event device * * @node : Contain the devfreq-event device that have been registered. * @dev : the device registered by devfreq-event class. dev.parent is * the device using devfreq-event. * @lock : a mutex to protect accessing devfreq-event. * @enable_count: the number of enable function have been called. * @desc : the description for devfreq-event device. * * This structure contains devfreq-event device information. */struct devfreq_event_dev { struct list_head node;
struct device dev; struct mutex lock; u32 enable_count;
const struct devfreq_event_desc *desc;};
/** * struct devfreq_event_data - the devfreq-event data * * @load_count : load count of devfreq-event device for the given period. * @total_count : total count of devfreq-event device for the given period. * each count may represent a clock cycle, a time unit * (ns/us/...), or anything the device driver wants. * Generally, utilization is load_count / total_count. * * This structure contains the data of devfreq-event device for polling period. */struct devfreq_event_data { unsigned long load_count; unsigned long total_count;};
/** * struct devfreq_event_ops - the operations of devfreq-event device * * @enable : Enable the devfreq-event device. * @disable : Disable the devfreq-event device. * @reset : Reset all setting of the devfreq-event device. * @set_event : Set the specific event type for the devfreq-event device. * @get_event : Get the result of the devfreq-event devie with specific * event type. * * This structure contains devfreq-event device operations which can be * implemented by devfreq-event device drivers. */struct devfreq_event_ops { /* Optional functions */ int (*enable)(struct devfreq_event_dev *edev); int (*disable)(struct devfreq_event_dev *edev); int (*reset)(struct devfreq_event_dev *edev);
/* Mandatory functions */ int (*set_event)(struct devfreq_event_dev *edev); int (*get_event)(struct devfreq_event_dev *edev, struct devfreq_event_data *edata);};
/** * struct devfreq_event_desc - the descriptor of devfreq-event device * * @name : the name of devfreq-event device. * @event_type : the type of the event determined and used by driver * @driver_data : the private data for devfreq-event driver. * @ops : the operation to control devfreq-event device. * * Each devfreq-event device is described with a this structure. * This structure contains the various data for devfreq-event device. * The event_type describes what is going to be counted in the register. * It might choose to count e.g. read requests, write data in bytes, etc. * The full supported list of types is present in specyfic header in: * include/dt-bindings/pmu/. */struct devfreq_event_desc { const char *name; u32 event_type; void *driver_data;
const struct devfreq_event_ops *ops;};
#if defined(CONFIG_PM_DEVFREQ_EVENT)extern int devfreq_event_enable_edev(struct devfreq_event_dev *edev);extern int devfreq_event_disable_edev(struct devfreq_event_dev *edev);extern bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);extern int devfreq_event_set_event(struct devfreq_event_dev *edev);extern int devfreq_event_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata);extern int devfreq_event_reset_event(struct devfreq_event_dev *edev);extern struct devfreq_event_dev *devfreq_event_get_edev_by_phandle( struct device *dev, const char *phandle_name, int index);extern int devfreq_event_get_edev_count(struct device *dev, const char *phandle_name);extern struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev, struct devfreq_event_desc *desc);extern int devfreq_event_remove_edev(struct devfreq_event_dev *edev);extern struct devfreq_event_dev *devm_devfreq_event_add_edev(struct device *dev, struct devfreq_event_desc *desc);extern void devm_devfreq_event_remove_edev(struct device *dev, struct devfreq_event_dev *edev);static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev){ return edev->desc->driver_data;}#elsestatic inline int devfreq_event_enable_edev(struct devfreq_event_dev *edev){ return -EINVAL;}
static inline int devfreq_event_disable_edev(struct devfreq_event_dev *edev){ return -EINVAL;}
static inline bool devfreq_event_is_enabled(struct devfreq_event_dev *edev){ return false;}
static inline int devfreq_event_set_event(struct devfreq_event_dev *edev){ return -EINVAL;}
static inline int devfreq_event_get_event(struct devfreq_event_dev *edev, struct devfreq_event_data *edata){ return -EINVAL;}
static inline int devfreq_event_reset_event(struct devfreq_event_dev *edev){ return -EINVAL;}
static inline struct devfreq_event_dev *devfreq_event_get_edev_by_phandle( struct device *dev, const char *phandle_name, int index){ return ERR_PTR(-EINVAL);}
static inline int devfreq_event_get_edev_count(struct device *dev, const char *phandle_name){ return -EINVAL;}
static inline struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev, struct devfreq_event_desc *desc){ return ERR_PTR(-EINVAL);}
static inline int devfreq_event_remove_edev(struct devfreq_event_dev *edev){ return -EINVAL;}
static inline struct devfreq_event_dev *devm_devfreq_event_add_edev( struct device *dev, struct devfreq_event_desc *desc){ return ERR_PTR(-EINVAL);}
static inline void devm_devfreq_event_remove_edev(struct device *dev, struct devfreq_event_dev *edev){}
static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev){ return NULL;}#endif /* CONFIG_PM_DEVFREQ_EVENT */
#endif /* __LINUX_DEVFREQ_EVENT_H__ */