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kernel/linux-imx6_3.14.28/include/uapi/linux/hpet.h 722 Bytes
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  #ifndef _UAPI__HPET__
  #define _UAPI__HPET__
  
  #include <linux/compiler.h>
  
  
  struct hpet_info {
  	unsigned long hi_ireqfreq;	/* Hz */
  	unsigned long hi_flags;	/* information */
  	unsigned short hi_hpet;
  	unsigned short hi_timer;
  };
  
  #define HPET_INFO_PERIODIC	0x0010	/* periodic-capable comparator */
  
  #define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
  #define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
  #define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
  #define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
  #define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
  #define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */
  
  #define MAX_HPET_TBS	8		/* maximum hpet timer blocks */
  
  #endif /* _UAPI__HPET__ */