Hamlib 4.7~git
 
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par_nt.h
1/* NT Parport Access stuff - Matthew Duggan (2002) */
2
3/*
4 * ParallelVdm Device (0x2C) is mostly undocumented, used by VDM for parallel
5 * port compatibility.
6 */
7
8/*
9 * Different from CTL_CODE in DDK, limited to ParallelVdm but makes this
10 * code cleaner.
11 */
12
13#ifndef _PAR_NT_H
14
15#define _PAR_NT_H
16
17#define NT_CTL_CODE( Function ) ( (0x2C<<16) | ((Function) << 2) )
18
19/* IOCTL codes */
20#define NT_IOCTL_DATA NT_CTL_CODE(1) /* Write Only */
21#define NT_IOCTL_CONTROL NT_CTL_CODE(2) /* Read/Write */
22#define NT_IOCTL_STATUS NT_CTL_CODE(3) /* Read Only */
23
24
25/*
26 * Raw port access (PC-style port registers but within inversions)
27 * Functions returning int may fail.
28 */
29
30/* The status pin functions operate in terms of these bits: */
31enum ieee1284_status_bits
32{
33 S1284_NFAULT = 0x08,
34 S1284_SELECT = 0x10,
35 S1284_PERROR = 0x20,
36 S1284_NACK = 0x40,
37 S1284_BUSY = 0x80,
38 /* To convert those values into PC-style register values, use this: */
39 S1284_INVERTED = S1284_BUSY
40};
41
42/* The control pin functions operate in terms of these bits: */
43enum ieee1284_control_bits
44{
45 C1284_NSTROBE = 0x01,
46 C1284_NAUTOFD = 0x02,
47 C1284_NINIT = 0x04,
48 C1284_NSELECTIN = 0x08,
49 /* To convert those values into PC-style register values, use this: */
50 C1284_INVERTED = (C1284_NSTROBE
51 | C1284_NAUTOFD
52 | C1284_NSELECTIN)
53};
54
55#endif /* _PAR_NT_H */