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/arch/alpha/include/asm/ioctl.h

https://gitlab.com/VilleSensePortingTeam/android_kernel_htc_ville-lp
C Header | 66 lines | 37 code | 11 blank | 18 comment | 0 complexity | ca6531c8fe03bc8ff219f0844655c97b MD5 | raw file
 1#ifndef _ALPHA_IOCTL_H
 2#define _ALPHA_IOCTL_H
 3
 4/*
 5 * The original linux ioctl numbering scheme was just a general
 6 * "anything goes" setup, where more or less random numbers were
 7 * assigned.  Sorry, I was clueless when I started out on this.
 8 *
 9 * On the alpha, we'll try to clean it up a bit, using a more sane
10 * ioctl numbering, and also trying to be compatible with OSF/1 in
11 * the process. I'd like to clean it up for the i386 as well, but
12 * it's so painful recognizing both the new and the old numbers..
13 */
14
15#define _IOC_NRBITS	8
16#define _IOC_TYPEBITS	8
17#define _IOC_SIZEBITS	13
18#define _IOC_DIRBITS	3
19
20#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
21#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
22#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
23#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)
24
25#define _IOC_NRSHIFT	0
26#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
27#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
28#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
29
30/*
31 * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
32 * And this turns out useful to catch old ioctl numbers in header
33 * files for us.
34 */
35#define _IOC_NONE	1U
36#define _IOC_READ	2U
37#define _IOC_WRITE	4U
38
39#define _IOC(dir,type,nr,size)			\
40	((unsigned int)				\
41	 (((dir)  << _IOC_DIRSHIFT) |		\
42	  ((type) << _IOC_TYPESHIFT) |		\
43	  ((nr)   << _IOC_NRSHIFT) |		\
44	  ((size) << _IOC_SIZESHIFT)))
45
46/* used to create numbers */
47#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
48#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
49#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
50#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
51
52/* used to decode them.. */
53#define _IOC_DIR(nr)		(((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
54#define _IOC_TYPE(nr)		(((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
55#define _IOC_NR(nr)		(((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
56#define _IOC_SIZE(nr)		(((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
57
58/* ...and for the drivers/sound files... */
59
60#define IOC_IN		(_IOC_WRITE << _IOC_DIRSHIFT)
61#define IOC_OUT		(_IOC_READ << _IOC_DIRSHIFT)
62#define IOC_INOUT	((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
63#define IOCSIZE_MASK	(_IOC_SIZEMASK << _IOC_SIZESHIFT)
64#define IOCSIZE_SHIFT	(_IOC_SIZESHIFT)
65
66#endif /* _ALPHA_IOCTL_H */