74 строки
2.2 KiB
C
74 строки
2.2 KiB
C
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#ifndef _SPARC_BPP_H
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#define _SPARC_BPP_H
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/*
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* Copyright (c) 1995 Picture Elements
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* Stephen Williams
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* Gus Baldauf
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*
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* Linux/SPARC port by Peter Zaitcev.
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* Integration into SPARC tree by Tom Dyas.
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*/
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#include <linux/ioctl.h>
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/*
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* This is a driver that supports IEEE Std 1284-1994 communications
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* with compliant or compatible devices. It will use whatever features
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* the device supports, prefering those that are typically faster.
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*
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* When the device is opened, it is left in COMPATABILITY mode, and
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* writes work like any printer device. The driver only attempt to
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* negotiate 1284 modes when needed so that plugs can be pulled,
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* switch boxes switched, etc., without disrupting things. It will
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* also leave the device in compatibility mode when closed.
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*/
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/*
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* This driver also supplies ioctls to manually manipulate the
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* pins. This is great for testing devices, or writing code to deal
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* with bizzarro-mode of the ACME Special TurboThingy Plus.
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*
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* NOTE: These ioctl currently do not interact well with
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* read/write. Caveat emptor.
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*
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* PUT_PINS allows us to assign the sense of all the pins, including
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* the data pins if being driven by the host. The GET_PINS returns the
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* pins that the peripheral drives, including data if appropriate.
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*/
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# define BPP_PUT_PINS _IOW('B', 1, int)
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# define BPP_GET_PINS _IOR('B', 2, char) /* that's bogus - should've been _IO */
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# define BPP_PUT_DATA _IOW('B', 3, int)
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# define BPP_GET_DATA _IOR('B', 4, char) /* ditto */
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/*
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* Set the data bus to input mode. Disengage the data bin driver and
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* be prepared to read values from the peripheral. If the arg is 0,
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* then revert the bus to output mode.
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*/
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# define BPP_SET_INPUT _IOW('B', 5, int)
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/*
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* These bits apply to the PUT operation...
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*/
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# define BPP_PP_nStrobe 0x0001
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# define BPP_PP_nAutoFd 0x0002
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# define BPP_PP_nInit 0x0004
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# define BPP_PP_nSelectIn 0x0008
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/*
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* These apply to the GET operation, which also reads the current value
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* of the previously put values. A bit mask of these will be returned
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* as a bit mask in the return code of the ioctl().
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*/
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# define BPP_GP_nAck 0x0100
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# define BPP_GP_Busy 0x0200
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# define BPP_GP_PError 0x0400
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# define BPP_GP_Select 0x0800
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# define BPP_GP_nFault 0x1000
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#endif
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