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par_nt.h
/* NT Parport Access stuff - Matthew Duggan (2002) */
/*
* ParallelVdm Device (0x2C) is mostly undocumented, used by VDM for parallel
* port compatibility.
*/
/*
* Different from CTL_CODE in DDK, limited to ParallelVdm but makes this
* code cleaner.
*/
#ifndef _PAR_NT_H
#define _PAR_NT_H
#define NT_CTL_CODE( Function ) ( (0x2C<<16) | ((Function) << 2) )
/* IOCTL codes */
#define NT_IOCTL_DATA NT_CTL_CODE(1) /* Write Only */
#define NT_IOCTL_CONTROL NT_CTL_CODE(2) /* Read/Write */
#define NT_IOCTL_STATUS NT_CTL_CODE(3) /* Read Only */
/*
* Raw port access (PC-style port registers but within inversions)
* Functions returning int may fail.
*/
/* The status pin functions operate in terms of these bits: */
enum ieee1284_status_bits
{
S1284_NFAULT = 0x08,
S1284_SELECT = 0x10,
S1284_PERROR = 0x20,
S1284_NACK = 0x40,
S1284_BUSY = 0x80,
/* To convert those values into PC-style register values, use this: */
S1284_INVERTED = S1284_BUSY
};
/* The control pin functions operate in terms of these bits: */
enum ieee1284_control_bits
{
C1284_NSTROBE = 0x01,
C1284_NAUTOFD = 0x02,
C1284_NINIT = 0x04,
C1284_NSELECTIN = 0x08,
/* To convert those values into PC-style register values, use this: */
C1284_INVERTED = (C1284_NSTROBE
| C1284_NAUTOFD
| C1284_NSELECTIN)
};
#endif /* _PAR_NT_H */