From owner-freebsd-current@FreeBSD.ORG  Fri Oct  9 10:58:28 2009
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1D8B51065672
	for <freebsd-current@freebsd.org>; Fri,  9 Oct 2009 10:58:28 +0000 (UTC)
	(envelope-from syso.fml@ext.no-route.org)
Received: from core.kel1.no-route.org (core.kel1.no-route.org [217.70.192.207])
	by mx1.freebsd.org (Postfix) with ESMTP id C78EB8FC0C
	for <freebsd-current@freebsd.org>; Fri,  9 Oct 2009 10:58:27 +0000 (UTC)
Received: from [0.0.0.0] (isis.kel.no-route.org [217.70.197.44])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by core.kel1.no-route.org (Postfix) with ESMTPSA id EDF9B13F6DC
	for <freebsd-current@freebsd.org>; Fri,  9 Oct 2009 10:38:48 +0000 (UTC)
Message-ID: <4ACF131C.1060201@ext.no-route.org>
Date: Fri, 09 Oct 2009 12:40:28 +0200
From: Sylwester Sosnowski <syso.fml@ext.no-route.org>
User-Agent: some piece of software
MIME-Version: 1.0
To: freebsd-current@freebsd.org
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Subject: Support for PC Engines ALIX2 reset pushbutton.
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 09 Oct 2009 10:58:28 -0000

Hello,

I've just written an user-space utility for handling the PC Enginges ALIX'
reset-pushbutton. It's a quick-and-dirty prototype and does the same what
"shutdown -h now" does. I'll do a clean rewrite later.

Any comments or suggestions appreciated.


Here is the prototype:

----- BEGIN -----

/*
 * User-space reset-button support for PC Engines ALIX boards.
 * This is a prototype.
 *
 * Usage:
 * Use from rc(8).
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/cdefs.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <machine/cpufunc.h>
#include <unistd.h>
#include <signal.h>
#include <sys/time.h>
#include <paths.h>
#include <syslog.h>

// MY_NAME is the process name used in syslog.
#define MY_NAME "resetguard"

// GPIO_RESET
u_int32_t switchAddr = 0x61b0;
int switchBit = 8;

// GPIO_LED3
u_int32_t ledAddr = 0x6180;
int ledBit = 11;


// Blink GPIO_LED3.
void blinkLed(int times)
{
	int i;

	for (i=0; i<times; i++)
	{
		outl(ledAddr, 1 << (ledBit + 16));
		usleep(80000);
		outl(ledAddr, 1 << ledBit);
		usleep(80000);
	}
}

// Return GPIO_RESET state.
char isResetPressed() {
    return ((inl(switchAddr) & (1 << switchBit)) == 0);
}

int main() {
    int fd;				// Define our file descriptor
    char *empty_environ[] = { NULL };	// Environment for halt(8)

    if(geteuid())
    {
	errx(1, "You're not super-user.");  // Show error and exit.
    }


    fd = open("/dev/io", O_RDONLY);	// Read-only file descriptor for /dev/io

    if (fd == -1) {			// On error (e.g. wrong permissions)
        perror("Cannot open /dev/io.");	// Print error message
        exit(1);			// and exit with status 1
    }

    /*
     *  At this point we'll be polling the GPIO-Pin of the Reset-button
     *  at the front of the PC Engines Alix board every 450ms.
     *  If the pin is HIGH, resetBoard() will be called.
     */

    while(1)			// Infinite loop
    {
        usleep(4000000);	// Wait ca. 450ms before probing again
	if(isResetPressed()) {	// If resetPressed() returns 1..
		blinkLed(4);		// Blink GPIO_LED3 4 times

		setlogmask(LOG_UPTO (LOG_NOTICE)); // LOG_NOTICE
		
		// We'll be logging to LOG_LOCAL1
		openlog(MY_NAME, LOG_CONS | LOG_NDELAY, LOG_LOCAL1);

		// Write message to syslog
		syslog(LOG_NOTICE, "Event detected on GPIO_RESET (UID %d)", getuid());

		// Close Log
		closelog();

		// Halt system (like "shutdown -h now" does)
		execle(_PATH_HALT, "halt", "-l", sync, (char *)NULL, empty_environ);

		// Exit with status 0
		exit(0);
	}
    }

    exit(0);			// This should never be reached (exit 0)
}


----- END -----