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/*
* $Id: printer.c,v 1.10 2009-10-15 11:47:49 potyra Exp $
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "printer.h"
#include "glue-io.h"
struct cpssp {
/* Config */
/* Ports */
struct sig_parallel *port_par;
/* Signals */
/* State */
/* Processes */
};
#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
static void
printer_recv(void *_cpssp, struct sig_parallel_msg *sc)
{
struct cpssp *cpssp = (struct cpssp *) _cpssp;
unsigned char helper;
struct sig_parallel_msg msg;
/* This acts like an SPP line printer */
/* Unless the printer is out of order, there's this signal active -
* and this printer never is out of order! Dooh! */
helper = PARPORT_STATUS_ERROR;
/* Don't do anything to the data/control signals, as this isn't
* a backchannel-enabled device.
* Send back data/control signals unchanged to match reality */
msg.data = sc->data;
msg.control = sc->control;
/* SPP protocol requirement: Only show being selected
* if being selected! That's just logical, isn't it? */
if (sc->control & PARPORT_CONTROL_SELECT) {
helper |= PARPORT_STATUS_SELECT;
}
/* SPP protocol: Recognize INIT */
if (!(sc->control & PARPORT_CONTROL_INIT)) {
fprintf(stderr,"\n\nPRINTER RESET\n\n");
}
/* SPP protocol: Recognize STROBE */
if (sc->control & PARPORT_CONTROL_STROBE) {
/* On STROBE, "latch" the data lines' signals and print */
io_write(2, &sc->data, 1);
/*
* Historic printers could automatically generate a line feed
* after each carriage return (ask IBM why)
*/
if (sc->control & PARPORT_CONTROL_AUTOFD
&& sc->data == 0x0d) {
io_write(2, "\n", 1);
}
msg.status = helper;
/* Acknowledge the STROBE, wait 1ns */
/* send_packet(&msg); */
sig_parallel_send(cpssp->port_par, cpssp, &msg);
/* Wait a nanosecond...
* though it's senseless, as we have network lag
* magnitudes longer than nanoseconds */
}
/* Tell the controller we're ready again */
helper |= PARPORT_STATUS_ACK;
helper |= PARPORT_STATUS_BUSY;
msg.status = helper;
sig_parallel_send(cpssp->port_par, cpssp, &msg);
}
void *
printer_create(
const char *name,
struct sig_manage *port_manage,
struct sig_parallel *port_par
)
{
static const struct sig_parallel_funcs funcs = {
.recv = printer_recv,
};
struct cpssp *cpssp;
cpssp = malloc(sizeof(*cpssp));
assert(cpssp);
cpssp->port_par = port_par;
sig_parallel_connect(port_par, cpssp, &funcs);
return cpssp;
}
void
printer_destroy(void *_cpssp)
{
struct cpssp *cpssp = _cpssp;
free(cpssp);
}
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