Re: Support for PC Engines ALIX2 reset pushbutton.

Hi Sylwester,

This is interesting, what boards should be supported? (I have a couple 
of 2d3's)

I will be needing something like this for my current project as well.

Thanks

TJ
Sylwester Sosnowski wrote:
> 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 -----
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