lp.h (2827B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * usr/include/linux/lp.h c.1991-1992 James Wiegand 4 * many modifications copyright (C) 1992 Michael K. Johnson 5 * Interrupt support added 1993 Nigel Gamble 6 * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 7 */ 8#ifndef _LINUX_LP_H 9#define _LINUX_LP_H 10 11 12#include <linux/wait.h> 13#include <linux/mutex.h> 14#include <uapi/linux/lp.h> 15 16/* Magic numbers for defining port-device mappings */ 17#define LP_PARPORT_UNSPEC -4 18#define LP_PARPORT_AUTO -3 19#define LP_PARPORT_OFF -2 20#define LP_PARPORT_NONE -1 21 22#define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ 23#define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ 24#define LP_TIME(minor) lp_table[(minor)].time /* wait time */ 25#define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ 26#define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ 27 /* PARPORT_IRQ_NONE means polled */ 28#ifdef LP_STATS 29#define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ 30#endif 31#define LP_BUFFER_SIZE PAGE_SIZE 32 33#define LP_BASE(x) lp_table[(x)].dev->port->base 34 35#ifdef LP_STATS 36struct lp_stats { 37 unsigned long chars; 38 unsigned long sleeps; 39 unsigned int maxrun; 40 unsigned int maxwait; 41 unsigned int meanwait; 42 unsigned int mdev; 43}; 44#endif 45 46struct lp_struct { 47 struct pardevice *dev; 48 unsigned long flags; 49 unsigned int chars; 50 unsigned int time; 51 unsigned int wait; 52 char *lp_buffer; 53#ifdef LP_STATS 54 unsigned int lastcall; 55 unsigned int runchars; 56 struct lp_stats stats; 57#endif 58 wait_queue_head_t waitq; 59 unsigned int last_error; 60 struct mutex port_mutex; 61 wait_queue_head_t dataq; 62 long timeout; 63 unsigned int best_mode; 64 unsigned int current_mode; 65 unsigned long bits; 66}; 67 68/* 69 * The following constants describe the various signals of the printer port 70 * hardware. Note that the hardware inverts some signals and that some 71 * signals are active low. An example is LP_STROBE, which must be programmed 72 * with 1 for being active and 0 for being inactive, because the strobe signal 73 * gets inverted, but it is also active low. 74 */ 75 76 77/* 78 * defines for 8255 control port 79 * base + 2 80 * accessed with LP_C(minor) 81 */ 82#define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ 83#define LP_PSELECP 0x08 /* inverted output, active low */ 84#define LP_PINITP 0x04 /* unchanged output, active low */ 85#define LP_PAUTOLF 0x02 /* inverted output, active low */ 86#define LP_PSTROBE 0x01 /* short high output on raising edge */ 87 88/* 89 * the value written to ports to test existence. PC-style ports will 90 * return the value written. AT-style ports will return 0. so why not 91 * make them the same ? 92 */ 93#define LP_DUMMY 0x00 94 95/* 96 * This is the port delay time, in microseconds. 97 * It is used only in the lp_init() and lp_reset() routine. 98 */ 99#define LP_DELAY 50 100 101#endif