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/* $Id: drv_generic_parport.c 905 2008-12-23 13:37:07Z michael $
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* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_generic_parport.c $
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* generic driver helper for serial and parport access
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* Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
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* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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* This file is part of LCD4Linux.
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H)
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#include <linux/parport.h>
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#include <linux/ppdev.h>
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#define PARPORT_CONTROL_STROBE 0x1
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#define PARPORT_CONTROL_AUTOFD 0x2
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#define PARPORT_CONTROL_INIT 0x4
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#define PARPORT_CONTROL_SELECT 0x8
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#define PARPORT_STATUS_ERROR 0x8
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#define PARPORT_STATUS_SELECT 0x10
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#define PARPORT_STATUS_PAPEROUT 0x20
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#define PARPORT_STATUS_ACK 0x40
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#define PARPORT_STATUS_BUSY 0x80
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/* these signals are inverted by hardware on the parallel port */
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#define PARPORT_CONTROL_INVERTED (PARPORT_CONTROL_STROBE | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_AUTOFD)
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#if !defined(WITH_OUTB) && !defined(WITH_PPDEV)
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#error neither outb() nor ppdev() possible
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#error cannot compile parallel port driver
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#include "drv_generic_parport.h"
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static char *Driver = "";
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static char *Section = "";
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static unsigned short Port = 0;
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static char *PPdev = NULL;
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/* Any bits set here will have their logic inverted at the parallel port */
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static unsigned char inverted_control_bits = 0;
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/* initial value taken from linux/parport_pc.c */
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static unsigned char ctr = 0xc;
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int drv_generic_parport_open(const char *section, const char *driver)
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Section = (char *) section;
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Driver = (char *) driver;
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error("The files include/linux/parport.h and/or include/linux/ppdev.h");
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error("were missing at compile time. Even if your system supports");
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error("ppdev, it will not be used.");
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error("You *really* should install these files and recompile LCD4linux!");
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s = cfg_get(Section, "Port", NULL);
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if (s == NULL || *s == '\0') {
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error("%s: no '%s.Port' entry from %s", Driver, Section, cfg_source());
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if ((Port = strtol(s, &e, 0)) == 0 || *e != '\0') {
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error("%s: bad %s.Port '%s' from %s", Driver, Section, s, cfg_source());
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info("%s: using ppdev %s", Driver, PPdev);
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PPfd = open(PPdev, O_RDWR);
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error("%s: open(%s) failed: %s", Driver, PPdev, strerror(errno));
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/* PPEXCL fails if someone else uses the port (e.g. lp.ko) */
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if (ioctl(PPfd, PPEXCL)) {
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info("%s: ioctl(%s, PPEXCL) failed: %s", PPdev, Driver, strerror(errno));
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info("%s: could not get exclusive access to %s.", Driver, PPdev);
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info("%s: got exclusive access to %s.", Driver, PPdev);
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if (ioctl(PPfd, PPCLAIM)) {
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error("%s: ioctl(%s, PPCLAIM) failed: %d %s", Driver, PPdev, errno, strerror(errno));
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error("using raw port 0x%x (deprecated!)", Port);
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error("You *really* should change your setup and use ppdev!");
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if ((Port + 3) <= 0x3ff) {
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if (ioperm(Port, 3, 1) != 0) {
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error("%s: ioperm(0x%x) failed: %s", Driver, Port, strerror(errno));
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error("%s: iopl(1) failed: %s", Driver, strerror(errno));
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int drv_generic_parport_close(void)
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debug("closing ppdev %s", PPdev);
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if (ioctl(PPfd, PPRELEASE)) {
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error("%s: ioctl(%s, PPRELEASE) failed: %s", Driver, PPdev, strerror(errno));
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if (close(PPfd) == -1) {
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error("%s: close(%s) failed: %s", Driver, PPdev, strerror(errno));
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debug("closing raw port 0x%x", Port);
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if ((Port + 3) <= 0x3ff) {
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if (ioperm(Port, 3, 0) != 0) {
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error("%s: ioperm(0x%x) failed: %s", Driver, Port, strerror(errno));
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error("%s: iopl(0) failed: %s", Driver, strerror(errno));
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static unsigned char drv_generic_parport_signal_ctrl(const char *name, const char *signal)
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/* Prefixing a signal name with '-' inverts the logic */
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if (signal[0] == '-') {
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if (strcasecmp(signal, "STROBE") == 0) {
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wire = PARPORT_CONTROL_STROBE;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:STROBE (Pin 1)%s", Driver, name, invert ? " [inverted]" : "");
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} else if (strcasecmp(signal, "AUTOFD") == 0) {
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wire = PARPORT_CONTROL_AUTOFD;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:AUTOFD (Pin 14)%s", Driver, name, invert ? " [inverted]" : "");
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} else if (strcasecmp(signal, "INIT") == 0) {
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wire = PARPORT_CONTROL_INIT;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:INIT (Pin 16)%s", Driver, name, invert ? " [inverted]" : "");
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} else if (strcasecmp(signal, "SLCTIN") == 0) {
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wire = PARPORT_CONTROL_SELECT;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:SLCTIN (Pin 17)%s", Driver, name, invert ? " [inverted]" : "");
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} else if (strcasecmp(signal, "SELECT") == 0) {
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wire = PARPORT_CONTROL_SELECT;
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error("%s: SELECT is deprecated. Please use SLCTIN instead!", Driver);
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info("%s: wiring: DISPLAY:%-9s - PARPORT:SLCTIN (Pin 17)%s", Driver, name, invert ? " [inverted]" : "");
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} else if (strcasecmp(signal, "GND") == 0) {
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info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
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error("%s: unknown signal <%s> for control line <%s>", Driver, signal, name);
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error("%s: should be STROBE, AUTOFD, INIT, SLCTIN or GND", Driver);
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inverted_control_bits |= wire;
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unsigned char drv_generic_parport_wire_ctrl(const char *name, const char *deflt)
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qprintf(key, sizeof(key), "Wire.%s", name);
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val = cfg_get(Section, key, deflt);
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wire = drv_generic_parport_signal_ctrl(name, val);
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unsigned char drv_generic_parport_hardwire_ctrl(const char *name, const char *signal)
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qprintf(key, sizeof(key), "Wire.%s", name);
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val = cfg_get(Section, key, "");
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/* maybe warn the user */
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if (*val != '\0' && strcasecmp(signal, val) != 0) {
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error("%s: ignoring configured signal <%s> for control line <%s>", Driver, val, name);
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wire = drv_generic_parport_signal_ctrl(name, signal);
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static unsigned char drv_generic_parport_signal_status(const char *name, const char *signal)
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if (strcasecmp(signal, "ERROR") == 0) {
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wire = PARPORT_STATUS_ERROR;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:ERROR (Pin 15)", Driver, name);
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} else if (strcasecmp(signal, "SELECT") == 0) {
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wire = PARPORT_STATUS_SELECT;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:SELECT (Pin 13)", Driver, name);
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} else if (strcasecmp(signal, "PAPEROUT") == 0) {
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wire = PARPORT_STATUS_PAPEROUT;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:PAPEROUT (Pin 12)", Driver, name);
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} else if (strcasecmp(signal, "ACK") == 0) {
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wire = PARPORT_STATUS_ACK;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:ACK (Pin 10)", Driver, name);
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} else if (strcasecmp(signal, "BUSY") == 0) {
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wire = PARPORT_STATUS_BUSY;
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info("%s: wiring: DISPLAY:%-9s - PARPORT:BUSY (Pin 11)", Driver, name);
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} else if (strcasecmp(signal, "GND") == 0) {
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info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
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error("%s: unknown signal <%s> for status line <%s>", Driver, signal, name);
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error("%s: should be ERROR, SELECT, PAPEROUT, ACK, BUSY or GND", Driver);
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unsigned char drv_generic_parport_wire_status(const char *name, const char *deflt)
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qprintf(key, sizeof(key), "Wire.%s", name);
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val = cfg_get(Section, key, deflt);
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wire = drv_generic_parport_signal_status(name, val);
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unsigned char drv_generic_parport_wire_data(const char *name, const char *deflt)
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qprintf(wire, sizeof(wire), "Wire.%s", name);
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s = cfg_get(Section, wire, deflt);
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if (strlen(s) == 3 && strncasecmp(s, "DB", 2) == 0 && s[2] >= '0' && s[2] <= '7') {
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} else if (strcasecmp(s, "GND") == 0) {
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error("%s: unknown signal <%s> for data line <%s>", Driver, s, name);
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error("%s: should be DB0..7 or GND", Driver);
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info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
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info("%s: wiring: DISPLAY:%-9s - PARPORT:DB%d (Pin %2d)", Driver, name, w, w + 2);
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void drv_generic_parport_direction(const int direction)
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ioctl(PPfd, PPDATADIR, &direction);
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/* code stolen from linux/parport_pc.h */
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ctr = (ctr & ~0x20) ^ (direction ? 0x20 : 0x00);
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unsigned char drv_generic_parport_status(void)
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PARPORT_STATUS_ERROR | PARPORT_STATUS_SELECT | PARPORT_STATUS_PAPEROUT | PARPORT_STATUS_ACK |
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ioctl(PPfd, PPRSTATUS, &data);
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data = inb(Port + 1);
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/* clear unused bits */
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void drv_generic_parport_control(const unsigned char mask, const unsigned char value)
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/* any signal affected? */
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/* Note: this may happen in case a signal is hardwired to GND */
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/* Strobe, Select and AutoFeed are inverted! */
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val = mask & (value ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
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struct ppdev_frob_struct frob;
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ioctl(PPfd, PPFCONTROL, &frob);
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/* code stolen from linux/parport_pc.h */
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ctr = (ctr & ~mask) ^ val;
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void drv_generic_parport_toggle(const unsigned char bits, const int level, const unsigned long delay)
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unsigned char value1, value2;
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/* any signal affected? */
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/* Note: this may happen in case a signal is hardwired to GND */
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value1 = level ? bits : 0;
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value2 = level ? 0 : bits;
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/* Strobe, Select and AutoFeed are inverted! */
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value1 = bits & (value1 ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
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value2 = bits & (value2 ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
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struct ppdev_frob_struct frob;
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ioctl(PPfd, PPFCONTROL, &frob);
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ioctl(PPfd, PPFCONTROL, &frob);
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ctr = (ctr & ~bits) ^ value1;
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ctr = (ctr & ~bits) ^ value2;
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void drv_generic_parport_data(const unsigned char data)
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ioctl(PPfd, PPWDATA, &data);
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unsigned char drv_generic_parport_read(void)
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ioctl(PPfd, PPRDATA, &data);
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void drv_generic_parport_debug(void)
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unsigned char control;
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ioctl(PPfd, PPRCONTROL, &control);
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debug("%cSTROBE %cAUTOFD %cINIT %cSLCTIN",
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control & PARPORT_CONTROL_STROBE ? '-' : '+',
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control & PARPORT_CONTROL_AUTOFD ? '-' : '+', control & PARPORT_CONTROL_INIT ? '+' : '-',
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control & PARPORT_CONTROL_SELECT ? '-' : '+');
added
removed
drv_generic_parport.c
