1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * usr/include/linux/lp.h c.1991-1992 James Wiegand 4*4882a593Smuzhiyun * many modifications copyright (C) 1992 Michael K. Johnson 5*4882a593Smuzhiyun * Interrupt support added 1993 Nigel Gamble 6*4882a593Smuzhiyun * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun #ifndef _LINUX_LP_H 9*4882a593Smuzhiyun #define _LINUX_LP_H 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #include <linux/wait.h> 13*4882a593Smuzhiyun #include <linux/mutex.h> 14*4882a593Smuzhiyun #include <uapi/linux/lp.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* Magic numbers for defining port-device mappings */ 17*4882a593Smuzhiyun #define LP_PARPORT_UNSPEC -4 18*4882a593Smuzhiyun #define LP_PARPORT_AUTO -3 19*4882a593Smuzhiyun #define LP_PARPORT_OFF -2 20*4882a593Smuzhiyun #define LP_PARPORT_NONE -1 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */ 23*4882a593Smuzhiyun #define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */ 24*4882a593Smuzhiyun #define LP_TIME(minor) lp_table[(minor)].time /* wait time */ 25*4882a593Smuzhiyun #define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */ 26*4882a593Smuzhiyun #define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ 27*4882a593Smuzhiyun /* PARPORT_IRQ_NONE means polled */ 28*4882a593Smuzhiyun #ifdef LP_STATS 29*4882a593Smuzhiyun #define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */ 30*4882a593Smuzhiyun #endif 31*4882a593Smuzhiyun #define LP_BUFFER_SIZE PAGE_SIZE 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun #define LP_BASE(x) lp_table[(x)].dev->port->base 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun #ifdef LP_STATS 36*4882a593Smuzhiyun struct lp_stats { 37*4882a593Smuzhiyun unsigned long chars; 38*4882a593Smuzhiyun unsigned long sleeps; 39*4882a593Smuzhiyun unsigned int maxrun; 40*4882a593Smuzhiyun unsigned int maxwait; 41*4882a593Smuzhiyun unsigned int meanwait; 42*4882a593Smuzhiyun unsigned int mdev; 43*4882a593Smuzhiyun }; 44*4882a593Smuzhiyun #endif 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun struct lp_struct { 47*4882a593Smuzhiyun struct pardevice *dev; 48*4882a593Smuzhiyun unsigned long flags; 49*4882a593Smuzhiyun unsigned int chars; 50*4882a593Smuzhiyun unsigned int time; 51*4882a593Smuzhiyun unsigned int wait; 52*4882a593Smuzhiyun char *lp_buffer; 53*4882a593Smuzhiyun #ifdef LP_STATS 54*4882a593Smuzhiyun unsigned int lastcall; 55*4882a593Smuzhiyun unsigned int runchars; 56*4882a593Smuzhiyun struct lp_stats stats; 57*4882a593Smuzhiyun #endif 58*4882a593Smuzhiyun wait_queue_head_t waitq; 59*4882a593Smuzhiyun unsigned int last_error; 60*4882a593Smuzhiyun struct mutex port_mutex; 61*4882a593Smuzhiyun wait_queue_head_t dataq; 62*4882a593Smuzhiyun long timeout; 63*4882a593Smuzhiyun unsigned int best_mode; 64*4882a593Smuzhiyun unsigned int current_mode; 65*4882a593Smuzhiyun unsigned long bits; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun /* 69*4882a593Smuzhiyun * The following constants describe the various signals of the printer port 70*4882a593Smuzhiyun * hardware. Note that the hardware inverts some signals and that some 71*4882a593Smuzhiyun * signals are active low. An example is LP_STROBE, which must be programmed 72*4882a593Smuzhiyun * with 1 for being active and 0 for being inactive, because the strobe signal 73*4882a593Smuzhiyun * gets inverted, but it is also active low. 74*4882a593Smuzhiyun */ 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun 77*4882a593Smuzhiyun /* 78*4882a593Smuzhiyun * defines for 8255 control port 79*4882a593Smuzhiyun * base + 2 80*4882a593Smuzhiyun * accessed with LP_C(minor) 81*4882a593Smuzhiyun */ 82*4882a593Smuzhiyun #define LP_PINTEN 0x10 /* high to read data in or-ed with data out */ 83*4882a593Smuzhiyun #define LP_PSELECP 0x08 /* inverted output, active low */ 84*4882a593Smuzhiyun #define LP_PINITP 0x04 /* unchanged output, active low */ 85*4882a593Smuzhiyun #define LP_PAUTOLF 0x02 /* inverted output, active low */ 86*4882a593Smuzhiyun #define LP_PSTROBE 0x01 /* short high output on raising edge */ 87*4882a593Smuzhiyun 88*4882a593Smuzhiyun /* 89*4882a593Smuzhiyun * the value written to ports to test existence. PC-style ports will 90*4882a593Smuzhiyun * return the value written. AT-style ports will return 0. so why not 91*4882a593Smuzhiyun * make them the same ? 92*4882a593Smuzhiyun */ 93*4882a593Smuzhiyun #define LP_DUMMY 0x00 94*4882a593Smuzhiyun 95*4882a593Smuzhiyun /* 96*4882a593Smuzhiyun * This is the port delay time, in microseconds. 97*4882a593Smuzhiyun * It is used only in the lp_init() and lp_reset() routine. 98*4882a593Smuzhiyun */ 99*4882a593Smuzhiyun #define LP_DELAY 50 100*4882a593Smuzhiyun 101*4882a593Smuzhiyun #endif 102