#ifndef _SYS_IOCCOM_H
#define _SYS_IOCCOM_H

#define _IOC_NRBITS     8
#define _IOC_TYPEBITS   8
#define _IOC_SIZEBITS   14
#define _IOC_DIRBITS    2

#define _IOC_NRMASK     ((1 << _IOC_NRBITS) - 1)
#define _IOC_TYPEMASK   ((1 << _IOC_TYPEBITS) - 1)
#define _IOC_SIZEMASK   ((1 << _IOC_SIZEBITS) - 1)
#define _IOC_DIRMASK    ((1 << _IOC_DIRBITS) - 1)

#define _IOC_NRSHIFT    0
#define _IOC_TYPESHIFT  (_IOC_NRSHIFT + _IOC_NRBITS)
#define _IOC_SIZESHIFT  (_IOC_TYPESHIFT + _IOC_TYPEBITS)
#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT + _IOC_SIZEBITS)

#define _IOC_NONE   0U
#define _IOC_WRITE  1U
#define _IOC_READ   2U

#define _IOC(dir, type, nr, size) \
    (((dir)  << _IOC_DIRSHIFT)  | \
     ((type) << _IOC_TYPESHIFT) | \
     ((nr)   << _IOC_NRSHIFT)   | \
     ((size) << _IOC_SIZESHIFT))

#define _IOC_TYPECHECK(t) (sizeof(t))

#define _IO(type, nr)            _IOC(_IOC_NONE,              (type), (nr), 0)
#define _IOR(type, nr, argtype)  _IOC(_IOC_READ,              (type), (nr), (_IOC_TYPECHECK(argtype)))
#define _IOW(type, nr, argtype)  _IOC(_IOC_WRITE,             (type), (nr), (_IOC_TYPECHECK(argtype)))
#define _IOWR(type, nr, argtype) _IOC(_IOC_READ | _IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(argtype)))

#define _IOC_DIR(nr)   (((nr) >> _IOC_DIRSHIFT)  & _IOC_DIRMASK)
#define _IOC_TYPE(nr)  (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
#define _IOC_NR(nr)    (((nr) >> _IOC_NRSHIFT)   & _IOC_NRMASK)
#define _IOC_SIZE(nr)  (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)

#define IOC_IN     (_IOC_WRITE  << _IOC_DIRSHIFT)
#define IOC_OUT    (_IOC_READ   << _IOC_DIRSHIFT)
#define IOC_INOUT  ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT)
#define IOCSIZE_MASK    (_IOC_SIZEMASK << _IOC_SIZESHIFT)
#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)

#endif