?? shortprint.h
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/* * Useful info describing the parallel port device. * * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet * Copyright (C) 2001 O'Reilly & Associates * * The source code in this file can be freely used, adapted, * and redistributed in source or binary form, so long as an * acknowledgment appears in derived source files. The citation * should list that the code comes from the book "Linux Device * Drivers" by Alessandro Rubini and Jonathan Corbet, published * by O'Reilly & Associates. No warranty is attached; * we cannot take responsibility for errors or fitness for use. * *//* * Register offsets */#define SP_DATA 0x00#define SP_STATUS 0x01#define SP_CONTROL 0x02#define SP_NPORTS 3/* * Status register bits. */#define SP_SR_BUSY 0x80#define SP_SR_ACK 0x40#define SP_SR_PAPER 0x20#define SP_SR_ONLINE 0x10#define SP_SR_ERR 0x08/* * Control register. */#define SP_CR_IRQ 0x10#define SP_CR_SELECT 0x08#define SP_CR_INIT 0x04#define SP_CR_AUTOLF 0x02#define SP_CR_STROBE 0x01/* * Minimum space before waking up a writer. */#define SP_MIN_SPACE PAGE_SIZE/2
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