include/linux/idle_stats_device.h

#ifndef __ARCH_ARM_MACH_MSM_IDLE_STATS_DEVICE_H
#define __ARCH_ARM_MACH_MSM_IDLE_STATS_DEVICE_H

#include <linux/types.h>
#include <linux/ioctl.h>

#define MSM_IDLE_STATS_EVENT_NONE                     0
#define MSM_IDLE_STATS_EVENT_BUSY_TIMER_EXPIRED       1
#define MSM_IDLE_STATS_EVENT_BUSY_TIMER_EXPIRED_RESET 2
#define MSM_IDLE_STATS_EVENT_COLLECTION_NEARLY_FULL   4
#define MSM_IDLE_STATS_EVENT_COLLECTION_FULL          8
#define MSM_IDLE_STATS_EVENT_IDLE_TIMER_EXPIRED      16

/*
 * All time, timer, and time interval values are in units of
 * microseconds unless stated otherwise.
 */
#define MSM_IDLE_STATS_NR_MAX_INTERVALS 200

struct msm_idle_pulse {
	__s64 busy_start_time;
	__u32 busy_interval;
	__u32 wait_interval;
};

struct msm_idle_read_stats {
	__u32 event;
	__s64 return_timestamp;
	__u32 busy_timer_remaining;
	__u32 nr_collected;
	struct msm_idle_pulse pulse_chain[MSM_IDLE_STATS_NR_MAX_INTERVALS];
};

struct msm_idle_write_stats {
	__u32 busy_timer;
	__u32 next_busy_timer;
	__u32 max_samples;
};

#define MSM_IDLE_STATS_IOC_MAGIC  0xD8
#define MSM_IDLE_STATS_IOC_READ_STATS  \
		_IOWR(MSM_IDLE_STATS_IOC_MAGIC, 1, struct msm_idle_read_stats)
#define MSM_IDLE_STATS_IOC_WRITE_STATS  \
		_IOWR(MSM_IDLE_STATS_IOC_MAGIC, 2, struct msm_idle_write_stats)

#ifdef __KERNEL__
#include <linux/hrtimer.h>
#include <linux/mutex.h>
#include <linux/miscdevice.h>

struct msm_idle_stats_device {
	const char *name;
	void (*get_sample)(struct msm_idle_stats_device *device,
		struct msm_idle_pulse *pulse);

	struct miscdevice miscdev;
	spinlock_t lock;
	wait_queue_head_t wait;
	struct list_head list;
	struct hrtimer busy_timer;
	ktime_t busy_timer_interval;
	ktime_t idle_start;
	ktime_t remaining_time;
	__u32 max_samples;

	struct msm_idle_read_stats *stats;
	struct msm_idle_read_stats stats_vector[2];
};

int msm_idle_stats_register_device(struct msm_idle_stats_device *device);
int msm_idle_stats_deregister_device(struct msm_idle_stats_device *device);
void msm_idle_stats_prepare_idle_start(struct msm_idle_stats_device *device);
void msm_idle_stats_abort_idle_start(struct msm_idle_stats_device *device);
void msm_idle_stats_idle_start(struct msm_idle_stats_device *device);
void msm_idle_stats_idle_end(struct msm_idle_stats_device *device,
				struct msm_idle_pulse *pulse);
void msm_idle_stats_update_event(struct msm_idle_stats_device *device,
				__u32 event);
#endif

#endif  /* __ARCH_ARM_MACH_MSM_IDLE_STATS_DEVICE_H */