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The C and C++ Include Header Files

/usr/include/linux/hpet.h


$ cat -n /usr/include/linux/hpet.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef __HPET__
     3	#define __HPET__
     4	
     5	
     6	
     7	
     8	struct hpet_info {
     9		unsigned long hi_ireqfreq;	/* Hz */
    10		unsigned long hi_flags;	/* information */
    11		unsigned short hi_hpet;
    12		unsigned short hi_timer;
    13	};
    14	
    15	#define HPET_INFO_PERIODIC	0x0010	/* periodic-capable comparator */
    16	
    17	#define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
    18	#define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
    19	#define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
    20	#define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
    21	#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
    22	#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */
    23	
    24	#define MAX_HPET_TBS	8		/* maximum hpet timer blocks */
    25	
    26	#endif /* __HPET__ */