#ifndef _LINUX_TIMEKEEPING_H
  #define _LINUX_TIMEKEEPING_H

  #include <linux/errno.h>

  /* Included from linux/ktime.h */
  
  void timekeeping_init(void);
  extern int timekeeping_suspended;
  
  /*
   * Get and set timeofday
   */
  extern void do_gettimeofday(struct timeval *tv);

  extern int do_settimeofday64(const struct timespec64 *ts);

  extern int do_sys_settimeofday64(const struct timespec64 *tv,
  				 const struct timezone *tz);
  static inline int do_sys_settimeofday(const struct timespec *tv,
  				      const struct timezone *tz)
  {
  	struct timespec64 ts64;
  
  	if (!tv)

  		return do_sys_settimeofday64(NULL, tz);
  
  	if (!timespec_valid(tv))

  		return -EINVAL;
  
  	ts64 = timespec_to_timespec64(*tv);
  	return do_sys_settimeofday64(&ts64, tz);
  }

  
  /*
   * Kernel time accessors
   */
  unsigned long get_seconds(void);

  struct timespec64 current_kernel_time64(void);

  /* does not take xtime_lock */
  struct timespec __current_kernel_time(void);

  static inline struct timespec current_kernel_time(void)
  {
  	struct timespec64 now = current_kernel_time64();
  
  	return timespec64_to_timespec(now);
  }

  /*
   * timespec based interfaces
   */

  struct timespec64 get_monotonic_coarse64(void);

  extern void getrawmonotonic64(struct timespec64 *ts);

  extern void ktime_get_ts64(struct timespec64 *ts);

  extern time64_t ktime_get_seconds(void);

  extern time64_t ktime_get_real_seconds(void);

  
  extern int __getnstimeofday64(struct timespec64 *tv);
  extern void getnstimeofday64(struct timespec64 *tv);

  extern void getboottime64(struct timespec64 *ts);

  
  #if BITS_PER_LONG == 64

  /**
   * Deprecated. Use do_settimeofday64().
   */
  static inline int do_settimeofday(const struct timespec *ts)
  {
  	return do_settimeofday64(ts);
  }

  static inline int __getnstimeofday(struct timespec *ts)
  {
  	return __getnstimeofday64(ts);
  }
  
  static inline void getnstimeofday(struct timespec *ts)
  {
  	getnstimeofday64(ts);
  }
  
  static inline void ktime_get_ts(struct timespec *ts)
  {
  	ktime_get_ts64(ts);
  }
  
  static inline void ktime_get_real_ts(struct timespec *ts)
  {
  	getnstimeofday64(ts);
  }

  static inline void getrawmonotonic(struct timespec *ts)
  {
  	getrawmonotonic64(ts);
  }

  static inline struct timespec get_monotonic_coarse(void)
  {
  	return get_monotonic_coarse64();
  }

  
  static inline void getboottime(struct timespec *ts)
  {
  	return getboottime64(ts);
  }

  #else

  /**
   * Deprecated. Use do_settimeofday64().
   */
  static inline int do_settimeofday(const struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	ts64 = timespec_to_timespec64(*ts);
  	return do_settimeofday64(&ts64);
  }

  static inline int __getnstimeofday(struct timespec *ts)
  {
  	struct timespec64 ts64;
  	int ret = __getnstimeofday64(&ts64);
  
  	*ts = timespec64_to_timespec(ts64);
  	return ret;
  }
  
  static inline void getnstimeofday(struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	getnstimeofday64(&ts64);
  	*ts = timespec64_to_timespec(ts64);
  }
  
  static inline void ktime_get_ts(struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	ktime_get_ts64(&ts64);
  	*ts = timespec64_to_timespec(ts64);
  }
  
  static inline void ktime_get_real_ts(struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	getnstimeofday64(&ts64);
  	*ts = timespec64_to_timespec(ts64);
  }

  
  static inline void getrawmonotonic(struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	getrawmonotonic64(&ts64);
  	*ts = timespec64_to_timespec(ts64);
  }

  
  static inline struct timespec get_monotonic_coarse(void)
  {
  	return timespec64_to_timespec(get_monotonic_coarse64());
  }

  static inline void getboottime(struct timespec *ts)
  {
  	struct timespec64 ts64;
  
  	getboottime64(&ts64);
  	*ts = timespec64_to_timespec(ts64);
  }
  #endif

  #define ktime_get_real_ts64(ts)	getnstimeofday64(ts)

  
  /*
   * ktime_t based interfaces
   */

  
  enum tk_offsets {
  	TK_OFFS_REAL,
  	TK_OFFS_BOOT,
  	TK_OFFS_TAI,
  	TK_OFFS_MAX,
  };

  extern ktime_t ktime_get(void);

  extern ktime_t ktime_get_with_offset(enum tk_offsets offs);

  extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);

  extern ktime_t ktime_get_raw(void);

  extern u32 ktime_get_resolution_ns(void);

  /**
   * ktime_get_real - get the real (wall-) time in ktime_t format
   */
  static inline ktime_t ktime_get_real(void)
  {
  	return ktime_get_with_offset(TK_OFFS_REAL);
  }

  /**
   * ktime_get_boottime - Returns monotonic time since boot in ktime_t format
   *
   * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the
   * time spent in suspend.
   */
  static inline ktime_t ktime_get_boottime(void)
  {
  	return ktime_get_with_offset(TK_OFFS_BOOT);
  }

  /**
   * ktime_get_clocktai - Returns the TAI time of day in ktime_t format
   */
  static inline ktime_t ktime_get_clocktai(void)
  {
  	return ktime_get_with_offset(TK_OFFS_TAI);
  }

  /**
   * ktime_mono_to_real - Convert monotonic time to clock realtime
   */
  static inline ktime_t ktime_mono_to_real(ktime_t mono)
  {
  	return ktime_mono_to_any(mono, TK_OFFS_REAL);
  }

  static inline u64 ktime_get_ns(void)
  {
  	return ktime_to_ns(ktime_get());
  }
  
  static inline u64 ktime_get_real_ns(void)
  {
  	return ktime_to_ns(ktime_get_real());
  }
  
  static inline u64 ktime_get_boot_ns(void)
  {
  	return ktime_to_ns(ktime_get_boottime());
  }

  static inline u64 ktime_get_tai_ns(void)
  {
  	return ktime_to_ns(ktime_get_clocktai());
  }

  static inline u64 ktime_get_raw_ns(void)
  {
  	return ktime_to_ns(ktime_get_raw());
  }

  extern u64 ktime_get_mono_fast_ns(void);

  extern u64 ktime_get_raw_fast_ns(void);

  /*

   * Timespec interfaces utilizing the ktime based ones
   */
  static inline void get_monotonic_boottime(struct timespec *ts)
  {
  	*ts = ktime_to_timespec(ktime_get_boottime());
  }

  static inline void get_monotonic_boottime64(struct timespec64 *ts)
  {
  	*ts = ktime_to_timespec64(ktime_get_boottime());
  }

  static inline void timekeeping_clocktai(struct timespec *ts)
  {
  	*ts = ktime_to_timespec(ktime_get_clocktai());
  }

  /*

   * RTC specific
   */

  extern bool timekeeping_rtc_skipsuspend(void);
  extern bool timekeeping_rtc_skipresume(void);

  extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);

  /*
   * PPS accessor
   */

  extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
  				        struct timespec64 *ts_real);

  
  /*

   * struct system_time_snapshot - simultaneous raw/real time capture with
   *	counter value
   * @cycles:	Clocksource counter value to produce the system times
   * @real:	Realtime system time
   * @raw:	Monotonic raw system time

   * @clock_was_set_seq:	The sequence number of clock was set events
   * @cs_was_changed_seq:	The sequence number of clocksource change events

   */
  struct system_time_snapshot {
  	cycle_t		cycles;
  	ktime_t		real;
  	ktime_t		raw;

  	unsigned int	clock_was_set_seq;
  	u8		cs_was_changed_seq;

  };
  
  /*

   * struct system_device_crosststamp - system/device cross-timestamp
   *	(syncronized capture)
   * @device:		Device time
   * @sys_realtime:	Realtime simultaneous with device time
   * @sys_monoraw:	Monotonic raw simultaneous with device time
   */
  struct system_device_crosststamp {
  	ktime_t device;
  	ktime_t sys_realtime;
  	ktime_t sys_monoraw;
  };
  
  /*
   * struct system_counterval_t - system counter value with the pointer to the
   *	corresponding clocksource
   * @cycles:	System counter value
   * @cs:		Clocksource corresponding to system counter value. Used by
   *	timekeeping code to verify comparibility of two cycle values
   */
  struct system_counterval_t {
  	cycle_t			cycles;
  	struct clocksource	*cs;
  };
  
  /*
   * Get cross timestamp between system clock and device clock
   */
  extern int get_device_system_crosststamp(
  			int (*get_time_fn)(ktime_t *device_time,
  				struct system_counterval_t *system_counterval,
  				void *ctx),
  			void *ctx,

  			struct system_time_snapshot *history,

  			struct system_device_crosststamp *xtstamp);
  
  /*

   * Simultaneously snapshot realtime and monotonic raw clocks
   */
  extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
  
  /*

   * Persistent clock related interfaces
   */

  extern int persistent_clock_is_local;

  extern void read_persistent_clock(struct timespec *ts);

  extern void read_persistent_clock64(struct timespec64 *ts);

  extern void read_boot_clock64(struct timespec64 *ts);

  extern int update_persistent_clock(struct timespec now);

  extern int update_persistent_clock64(struct timespec64 now);

  
  
  #endif