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|
/* $Id$
* $URL$
*
* generic driver helper for serial and parport access
*
* Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_IO_H
#include <sys/io.h>
#define WITH_OUTB
#else
#ifdef HAVE_ASM_IO_H
#include <asm/io.h>
#define WITH_OUTB
#endif
#endif
#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H)
#define WITH_PPDEV
#include <linux/parport.h>
#include <linux/ppdev.h>
#else
#define PARPORT_CONTROL_STROBE 0x1
#define PARPORT_CONTROL_AUTOFD 0x2
#define PARPORT_CONTROL_INIT 0x4
#define PARPORT_CONTROL_SELECT 0x8
#define PARPORT_STATUS_ERROR 0x8
#define PARPORT_STATUS_SELECT 0x10
#define PARPORT_STATUS_PAPEROUT 0x20
#define PARPORT_STATUS_ACK 0x40
#define PARPORT_STATUS_BUSY 0x80
#endif
/* these signals are inverted by hardware on the parallel port */
#define PARPORT_CONTROL_INVERTED (PARPORT_CONTROL_STROBE | PARPORT_CONTROL_SELECT | PARPORT_CONTROL_AUTOFD)
#if !defined(WITH_OUTB) && !defined(WITH_PPDEV)
#error neither outb() nor ppdev() possible
#error cannot compile parallel port driver
#endif
#include "debug.h"
#include "qprintf.h"
#include "cfg.h"
#include "udelay.h"
#include "drv_generic_parport.h"
static char *Driver = "";
static char *Section = "";
static unsigned short Port = 0;
static char *PPdev = NULL;
/* Any bits set here will have their logic inverted at the parallel port */
static unsigned char inverted_control_bits = 0;
/* initial value taken from linux/parport_pc.c */
static unsigned char ctr = 0xc;
#ifdef WITH_PPDEV
static int PPfd = -1;
#endif
int drv_generic_parport_open(const char *section, const char *driver)
{
char *s, *e;
Section = (char *) section;
Driver = (char *) driver;
udelay_init();
#ifndef WITH_PPDEV
error("The files include/linux/parport.h and/or include/linux/ppdev.h");
error("were missing at compile time. Even if your system supports");
error("ppdev, it will not be used.");
error("You *really* should install these files and recompile LCD4linux!");
#endif
s = cfg_get(Section, "Port", NULL);
if (s == NULL || *s == '\0') {
error("%s: no '%s.Port' entry from %s", Driver, Section, cfg_source());
return -1;
}
PPdev = NULL;
if ((Port = strtol(s, &e, 0)) == 0 || *e != '\0') {
#ifdef WITH_PPDEV
Port = 0;
PPdev = s;
#else
error("%s: bad %s.Port '%s' from %s", Driver, Section, s, cfg_source());
free(s);
return -1;
#endif
}
#ifdef WITH_PPDEV
if (PPdev) {
info("%s: using ppdev %s", Driver, PPdev);
PPfd = open(PPdev, O_RDWR);
if (PPfd == -1) {
error("%s: open(%s) failed: %s", Driver, PPdev, strerror(errno));
return -1;
}
#if 0
/* PPEXCL fails if someone else uses the port (e.g. lp.ko) */
if (ioctl(PPfd, PPEXCL)) {
info("%s: ioctl(%s, PPEXCL) failed: %s", PPdev, Driver, strerror(errno));
info("%s: could not get exclusive access to %s.", Driver, PPdev);
} else {
info("%s: got exclusive access to %s.", Driver, PPdev);
}
#endif
if (ioctl(PPfd, PPCLAIM)) {
error("%s: ioctl(%s, PPCLAIM) failed: %d %s", Driver, PPdev, errno, strerror(errno));
return -1;
}
} else
#endif
{
error("using raw port 0x%x (deprecated!)", Port);
error("You *really* should change your setup and use ppdev!");
if ((Port + 3) <= 0x3ff) {
if (ioperm(Port, 3, 1) != 0) {
error("%s: ioperm(0x%x) failed: %s", Driver, Port, strerror(errno));
return -1;
}
} else {
if (iopl(3) != 0) {
error("%s: iopl(1) failed: %s", Driver, strerror(errno));
return -1;
}
}
}
return 0;
}
int drv_generic_parport_close(void)
{
#ifdef WITH_PPDEV
if (PPdev) {
debug("closing ppdev %s", PPdev);
if (ioctl(PPfd, PPRELEASE)) {
error("%s: ioctl(%s, PPRELEASE) failed: %s", Driver, PPdev, strerror(errno));
}
if (close(PPfd) == -1) {
error("%s: close(%s) failed: %s", Driver, PPdev, strerror(errno));
return -1;
}
free(PPdev);
} else
#endif
{
debug("closing raw port 0x%x", Port);
if ((Port + 3) <= 0x3ff) {
if (ioperm(Port, 3, 0) != 0) {
error("%s: ioperm(0x%x) failed: %s", Driver, Port, strerror(errno));
return -1;
}
} else {
if (iopl(0) != 0) {
error("%s: iopl(0) failed: %s", Driver, strerror(errno));
return -1;
}
}
}
return 0;
}
static unsigned char drv_generic_parport_signal_ctrl(const char *name, const char *signal)
{
unsigned char wire;
int invert = 0;
/* Prefixing a signal name with '-' inverts the logic */
if (signal[0] == '-') {
invert = 1;
signal++;
}
if (strcasecmp(signal, "STROBE") == 0) {
wire = PARPORT_CONTROL_STROBE;
info("%s: wiring: DISPLAY:%-9s - PARPORT:STROBE (Pin 1)%s", Driver, name, invert ? " [inverted]" : "");
} else if (strcasecmp(signal, "AUTOFD") == 0) {
wire = PARPORT_CONTROL_AUTOFD;
info("%s: wiring: DISPLAY:%-9s - PARPORT:AUTOFD (Pin 14)%s", Driver, name, invert ? " [inverted]" : "");
} else if (strcasecmp(signal, "INIT") == 0) {
wire = PARPORT_CONTROL_INIT;
info("%s: wiring: DISPLAY:%-9s - PARPORT:INIT (Pin 16)%s", Driver, name, invert ? " [inverted]" : "");
} else if (strcasecmp(signal, "SLCTIN") == 0) {
wire = PARPORT_CONTROL_SELECT;
info("%s: wiring: DISPLAY:%-9s - PARPORT:SLCTIN (Pin 17)%s", Driver, name, invert ? " [inverted]" : "");
} else if (strcasecmp(signal, "SELECT") == 0) {
wire = PARPORT_CONTROL_SELECT;
error("%s: SELECT is deprecated. Please use SLCTIN instead!", Driver);
info("%s: wiring: DISPLAY:%-9s - PARPORT:SLCTIN (Pin 17)%s", Driver, name, invert ? " [inverted]" : "");
} else if (strcasecmp(signal, "GND") == 0) {
wire = 0;
info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
} else {
error("%s: unknown signal <%s> for control line <%s>", Driver, signal, name);
error("%s: should be STROBE, AUTOFD, INIT, SLCTIN or GND", Driver);
return 0xff;
}
if (invert) {
inverted_control_bits |= wire;
}
return wire;
}
unsigned char drv_generic_parport_wire_ctrl(const char *name, const char *deflt)
{
unsigned char wire;
char key[256];
char *val;
qprintf(key, sizeof(key), "Wire.%s", name);
val = cfg_get(Section, key, deflt);
wire = drv_generic_parport_signal_ctrl(name, val);
free(val);
return wire;
}
unsigned char drv_generic_parport_hardwire_ctrl(const char *name, const char *signal)
{
unsigned char wire;
char key[256];
char *val;
qprintf(key, sizeof(key), "Wire.%s", name);
val = cfg_get(Section, key, "");
/* maybe warn the user */
if (*val != '\0' && strcasecmp(signal, val) != 0) {
error("%s: ignoring configured signal <%s> for control line <%s>", Driver, val, name);
}
free(val);
wire = drv_generic_parport_signal_ctrl(name, signal);
return wire;
}
static unsigned char drv_generic_parport_signal_status(const char *name, const char *signal)
{
unsigned char wire;
if (strcasecmp(signal, "ERROR") == 0) {
wire = PARPORT_STATUS_ERROR;
info("%s: wiring: DISPLAY:%-9s - PARPORT:ERROR (Pin 15)", Driver, name);
} else if (strcasecmp(signal, "SELECT") == 0) {
wire = PARPORT_STATUS_SELECT;
info("%s: wiring: DISPLAY:%-9s - PARPORT:SELECT (Pin 13)", Driver, name);
} else if (strcasecmp(signal, "PAPEROUT") == 0) {
wire = PARPORT_STATUS_PAPEROUT;
info("%s: wiring: DISPLAY:%-9s - PARPORT:PAPEROUT (Pin 12)", Driver, name);
} else if (strcasecmp(signal, "ACK") == 0) {
wire = PARPORT_STATUS_ACK;
info("%s: wiring: DISPLAY:%-9s - PARPORT:ACK (Pin 10)", Driver, name);
} else if (strcasecmp(signal, "BUSY") == 0) {
wire = PARPORT_STATUS_BUSY;
info("%s: wiring: DISPLAY:%-9s - PARPORT:BUSY (Pin 11)", Driver, name);
} else if (strcasecmp(signal, "GND") == 0) {
wire = 0;
info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
} else {
error("%s: unknown signal <%s> for status line <%s>", Driver, signal, name);
error("%s: should be ERROR, SELECT, PAPEROUT, ACK, BUSY or GND", Driver);
return 0xff;
}
return wire;
}
unsigned char drv_generic_parport_wire_status(const char *name, const char *deflt)
{
unsigned char wire;
char key[256];
char *val;
qprintf(key, sizeof(key), "Wire.%s", name);
val = cfg_get(Section, key, deflt);
wire = drv_generic_parport_signal_status(name, val);
free(val);
return wire;
}
unsigned char drv_generic_parport_wire_data(const char *name, const char *deflt)
{
unsigned char w;
char wire[256];
char *s;
qprintf(wire, sizeof(wire), "Wire.%s", name);
s = cfg_get(Section, wire, deflt);
if (strlen(s) == 3 && strncasecmp(s, "DB", 2) == 0 && s[2] >= '0' && s[2] <= '7') {
w = s[2] - '0';
} else if (strcasecmp(s, "GND") == 0) {
w = 0;
} else {
error("%s: unknown signal <%s> for data line <%s>", Driver, s, name);
error("%s: should be DB0..7 or GND", Driver);
return 0xff;
}
free(s);
if (w == 0) {
info("%s: wiring: DISPLAY:%-9s - PARPORT:GND", Driver, name);
} else {
info("%s: wiring: DISPLAY:%-9s - PARPORT:DB%d (Pin %2d)", Driver, name, w, w + 2);
}
w = 1 << w;
return w;
}
void drv_generic_parport_direction(const int direction)
{
#ifdef WITH_PPDEV
if (PPdev) {
ioctl(PPfd, PPDATADIR, &direction);
} else
#endif
{
/* code stolen from linux/parport_pc.h */
ctr = (ctr & ~0x20) ^ (direction ? 0x20 : 0x00);
outb(ctr, Port + 2);
}
}
unsigned char drv_generic_parport_status(void)
{
unsigned char mask =
PARPORT_STATUS_ERROR | PARPORT_STATUS_SELECT | PARPORT_STATUS_PAPEROUT | PARPORT_STATUS_ACK |
PARPORT_STATUS_BUSY;
unsigned char data;
#ifdef WITH_PPDEV
if (PPdev) {
ioctl(PPfd, PPRSTATUS, &data);
} else
#endif
{
data = inb(Port + 1);
}
/* clear unused bits */
data &= mask;
return data;
}
void drv_generic_parport_control(const unsigned char mask, const unsigned char value)
{
unsigned char val;
/* any signal affected? */
/* Note: this may happen in case a signal is hardwired to GND */
if (mask == 0)
return;
/* Strobe, Select and AutoFeed are inverted! */
val = mask & (value ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
#ifdef WITH_PPDEV
if (PPdev) {
struct ppdev_frob_struct frob;
frob.mask = mask;
frob.val = val;
ioctl(PPfd, PPFCONTROL, &frob);
} else
#endif
{
/* code stolen from linux/parport_pc.h */
ctr = (ctr & ~mask) ^ val;
outb(ctr, Port + 2);
}
}
void drv_generic_parport_toggle(const unsigned char bits, const int level, const unsigned long delay)
{
unsigned char value1, value2;
/* any signal affected? */
/* Note: this may happen in case a signal is hardwired to GND */
if (bits == 0)
return;
/* prepare value */
value1 = level ? bits : 0;
value2 = level ? 0 : bits;
/* Strobe, Select and AutoFeed are inverted! */
value1 = bits & (value1 ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
value2 = bits & (value2 ^ PARPORT_CONTROL_INVERTED ^ inverted_control_bits);
#ifdef WITH_PPDEV
if (PPdev) {
struct ppdev_frob_struct frob;
frob.mask = bits;
/* rise */
frob.val = value1;
ioctl(PPfd, PPFCONTROL, &frob);
/* pulse width */
ndelay(delay);
/* lower */
frob.val = value2;
ioctl(PPfd, PPFCONTROL, &frob);
} else
#endif
{
/* rise */
ctr = (ctr & ~bits) ^ value1;
outb(ctr, Port + 2);
/* pulse width */
ndelay(delay);
/* lower */
ctr = (ctr & ~bits) ^ value2;
outb(ctr, Port + 2);
}
}
void drv_generic_parport_data(const unsigned char data)
{
#ifdef WITH_PPDEV
if (PPdev) {
ioctl(PPfd, PPWDATA, &data);
} else
#endif
{
outb(data, Port);
}
}
unsigned char drv_generic_parport_read(void)
{
unsigned char data;
#ifdef WITH_PPDEV
if (PPdev) {
ioctl(PPfd, PPRDATA, &data);
} else
#endif
{
data = inb(Port);
}
return data;
}
void drv_generic_parport_debug(void)
{
unsigned char control;
#ifdef WITH_PPDEV
if (PPdev) {
ioctl(PPfd, PPRCONTROL, &control);
} else
#endif
{
control = ctr;
}
debug("%cSTROBE %cAUTOFD %cINIT %cSLCTIN",
control & PARPORT_CONTROL_STROBE ? '-' : '+',
control & PARPORT_CONTROL_AUTOFD ? '-' : '+', control & PARPORT_CONTROL_INIT ? '+' : '-',
control & PARPORT_CONTROL_SELECT ? '-' : '+');
}
|
