1#ifndef _ASM_GENERIC_IOCTL_H
2#define _ASM_GENERIC_IOCTL_H
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22#define _IOC_NRBITS 8
23#define _IOC_TYPEBITS 8
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29
30#ifndef _IOC_SIZEBITS
31# define _IOC_SIZEBITS 14
32#endif
33
34#ifndef _IOC_DIRBITS
35# define _IOC_DIRBITS 2
36#endif
37
38#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
39#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
40#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
41#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
42
43#define _IOC_NRSHIFT 0
44#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
45#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
46#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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52
53#ifndef _IOC_NONE
54# define _IOC_NONE 0U
55#endif
56
57#ifndef _IOC_WRITE
58# define _IOC_WRITE 1U
59#endif
60
61#ifndef _IOC_READ
62# define _IOC_READ 2U
63#endif
64
65#define _IOC(dir,type,nr,size) \
66 (((dir) << _IOC_DIRSHIFT) | \
67 ((type) << _IOC_TYPESHIFT) | \
68 ((nr) << _IOC_NRSHIFT) | \
69 ((size) << _IOC_SIZESHIFT))
70
71#ifdef __KERNEL__
72
73extern unsigned int __invalid_size_argument_for_IOC;
74#define _IOC_TYPECHECK(t) \
75 ((sizeof(t) == sizeof(t[1]) && \
76 sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
77 sizeof(t) : __invalid_size_argument_for_IOC)
78#else
79#define _IOC_TYPECHECK(t) (sizeof(t))
80#endif
81
82
83#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
84#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
85#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
86#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
87#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
88#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
89#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
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91
92#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
93#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
94#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
95#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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98
99#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
100#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
101#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
102#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
103#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
104
105#endif
106