sane-project-website/old-archive/1999-03/0017.html

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<title>sane-devel: off.c (for Mustek 600 II N)</title>
<h1>off.c (for Mustek 600 II N)</h1>
<b>Andreas Czechanowski</b> (<a href="mailto:andreas@inspc44b.ins.uni-stuttgart.de"><i>andreas@inspc44b.ins.uni-stuttgart.de</i></a>)<br>
<i>Tue, 2 Mar 1999 17:08:34 +0100 (MET)</i>
<p>
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Hi !<br>
<p>
This is a utility for the tortured 600 II N user who wants to<br>
switch the scanner off after a program crash or if it gets not<br>
correctly switched off upon program exit.<br>
<p>
Could please somebody integrate this file into the source tree<br>
(with a Makefile if you want, but it is for a somewhat exotic<br>
scanner so only few feople will need it, and they probably will<br>
be able to compile it on their own...) ?<br>
<p>
Regards,<br>
<p>
Andreas.<br>
<p>
------------------------- cut here --------------------------<br>
/*<br>
    off.c - Switch the Mustek 600 II N off<br>
<p>
    This utility accesses the I/O-ports directly and must therefore be<br>
    run with euid root, or must at least have access to /dev/port.<br>
    Compile with:<br>
      gcc -DHAVE_SYS_IO_H -O2 -Wall -s -o off off.c<br>
    The -O2 optimization is needed to allow inline functions !<br>
    Copyright (C) 1997-1999 Andreas Czechanowski, DL4SDC<br>
<p>
    This program is free software; you can redistribute it and/or modify<br>
    it under the terms of the GNU General Public License as published by<br>
    the Free Software Foundation; either version 2 of the License, or<br>
    (at your option) any later version.<br>
<p>
    This program is distributed in the hope that it will be useful,<br>
    but WITHOUT ANY WARRANTY; without even the implied warranty of<br>
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the<br>
    GNU General Public License for more details.<br>
<p>
    You should have received a copy of the GNU General Public License<br>
    along with this program; if not, write to the Free Software Foundation,<br>
    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.<br>
<p>
    <a href="mailto:andreas.czechanowski@ins.uni-stuttgart.de">andreas.czechanowski@ins.uni-stuttgart.de</a><br>
*/<br>
    <br>
#define MUSTEK_CONF	"/usr/local/etc/sane.d/mustek.conf"<br>
#define PORT_DEV	"/dev/port"<br>
<p>
#include &lt;stdio.h&gt;<br>
#include &lt;stdlib.h&gt;<br>
#include &lt;sys/types.h&gt;<br>
#include &lt;sys/stat.h&gt;<br>
#include &lt;fcntl.h&gt;<br>
#include &lt;string.h&gt;<br>
#include &lt;unistd.h&gt;<br>
<p>
#ifdef HAVE_SYS_IO_H<br>
# include &lt;sys/io.h&gt;    /* use where available (glibc 2.x, for example) */<br>
#elif HAVE_ASM_IO_H<br>
# include &lt;asm/io.h&gt;    /* ugly, but backwards compatible */<br>
#elif defined(__i386__)  &amp;&amp; defined (__GNUC__)<br>
<p>
static __inline__ void<br>
outb (u_char value, u_long port)<br>
{<br>
  __asm__ __volatile__ ("outb %0,%1" : : "a" (value), "d" ((u_short) port));<br>
}<br>
<p>
static __inline__ u_char<br>
inb (u_long port)<br>
{<br>
  u_char value;<br>
<p>
  __asm__ __volatile__ ("inb %1,%0" : "=a" (value) : "d" ((u_short)port));<br>
  return value;<br>
}<br>
#endif<br>
<p>
char *Mustek_Conf = MUSTEK_CONF;<br>
<p>
int allowed_ports[] = {<br>
  0x26b, 0x26c,<br>
  0x2ab, 0x2ac,<br>
  0x2eb, 0x2ec,<br>
  0x22b, 0x22c,<br>
  0x32b, 0x32c,<br>
  0x36b, 0x36c,<br>
  0x3ab, 0x3ac,<br>
  0x3eb, 0x3ec,<br>
  -1<br>
};<br>
<p>
void<br>
usage(void)<br>
{<br>
    fprintf(stderr, "Usage: off [port]\n"<br>
	"  switches the Mustek 600 II N off that is connected to\n"<br>
	"  base address &lt;port&gt;. If address is not given, reads it\n"<br>
	"  from SANE config file &lt;%s&gt;.\n", Mustek_Conf);<br>
}<br>
<p>
void<br>
noaccess(int portaddr)<br>
{<br>
    fprintf(stderr, "Access to port 0x%03x not allowed !\n", portaddr);<br>
}<br>
<p>
int<br>
check_port(int portaddr)<br>
{<br>
    int i, j;<br>
<p>
    for (i = 0; (j = allowed_ports[i]) != -1; i++) {<br>
	if (j == portaddr)<br>
	    return j;<br>
    }<br>
    return -1;<br>
}<br>
<p>
int<br>
str2int(char *ch)<br>
{<br>
    int i;<br>
<p>
    i = strtol(ch, NULL, 0);<br>
    return i;<br>
}<br>
<p>
int<br>
main(int argc, char **argv)<br>
{<br>
    char *cp;<br>
    int portaddr = 0;<br>
    FILE *fp;<br>
    int pfd;<br>
<p>
    /* get config file name from environment if variable is set */<br>
    if (NULL != (cp = getenv("MUSTEK_CONF")))<br>
    {<br>
	Mustek_Conf = cp;<br>
    }<br>
<p>
    /* if port is explicitly given, try this one */<br>
    if (argc &gt; 1)<br>
    {<br>
	portaddr = str2int(argv[1]);<br>
    }<br>
    /* else try to look it up from SANE's mustek.conf file */<br>
    else<br>
    if (NULL != (fp = fopen(MUSTEK_CONF, "r")))<br>
    {<br>
	char line[256];<br>
<p>
	while (NULL != fgets(line, 255, fp))<br>
	{<br>
	    if ('#' == *line)<br>
		continue;<br>
	    if (0 != (portaddr = str2int(line)))<br>
		break;<br>
	}<br>
	fclose(fp);<br>
    }<br>
    else<br>
    {<br>
	fprintf(stderr, "Mustek config file &lt;%s&gt; not found\n", Mustek_Conf);<br>
	usage();<br>
	exit(1);<br>
    }<br>
<p>
    if (check_port(portaddr) &lt; 0 || check_port(portaddr + 1) &lt; 0)<br>
    {<br>
	fprintf(stderr, "invalid port address specified !\n");<br>
	usage();<br>
	exit(1);<br>
    }<br>
<p>
    /* we need the control port, not the data port, so... */<br>
    portaddr++;<br>
<p>
    fprintf(stderr, "using control port address 0x%03x\n", portaddr);<br>
    /* try to get I/O permission from the kernel */<br>
    if (ioperm(portaddr, 1, 1) == 0)<br>
    {<br>
	outb(0x00, portaddr);<br>
    }<br>
    /* else try to open /dev/port to access the I/O port */<br>
    else<br>
    if ((pfd = open(PORT_DEV, O_RDWR, 0666)) &gt;= 0)<br>
    {<br>
	char offcmd[] = { 0x00 };<br>
<p>
	if ((lseek(pfd, portaddr, SEEK_SET) != portaddr)<br>
<i>	 || (write(pfd, offcmd, 1) != 1))</i><br>
	{<br>
	    perror("error handling /dev/port");<br>
	    exit(1);<br>
	}<br>
	close(pfd);<br>
    }<br>
    else<br>
    {<br>
	fprintf(stderr, "Could not get port access:\n"<br>
		"Neither via ioperm(), nor via /dev/port.\n"<br>
		"This program must be run setuid root,\n"<br>
		"or the user must have access to /dev/port.\n");<br>
	exit(1);<br>
    }<br>
    printf("successfully sent OFF-command to control port at 0x%03x.\n",<br>
		 portaddr);<br>
<p>
    exit(0);<br>
}<br>
<p>
------------------------- cut here --------------------------<br>
<p>
<pre>
--
Dipl.-Ing. Andreas Czechanowski
<a href="mailto:andreas.czechanowski@ins.uni-stuttgart.de">andreas.czechanowski@ins.uni-stuttgart.de</a>
Institut fuer Netzwerk- und Systemtheorie
Universitaet Stuttgart
<p>
<p>
<pre>
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</pre>
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<p>
<ul>
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<li> <b>Next message:</b> <a href="0018.html">Greg Franks: "Microtek x6el problems"</a>
<li> <b>Previous message:</b> <a href="0016.html">Torsten Evers: "Mustek 600CP"</a>
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