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Old 12-26-2012, 04:34 PM   #1
KevinShort
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Posts: 348
Karma: 209937
Join Date: Jan 2012
Location: Virginia, US
Device: Kobo Wifi, Kobo Glo
Controlling the Glo's Frontlight

I was looking at a strace of nickel today, and found that the Glo's frontlight is controlled by ioctl calls to /dev/ntx_io. I hacked together some quick C code to control the light:
Code:
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>

int main(int argc, char *argv[])
{
    if ( argc != 2 ) {
        printf("Usage: %s brightness \n", argv[0]);
        return 1;
    }
    
    int light;

    // Open the file for reading and writing
    if ((light = open("/dev/ntx_io", O_RDWR)) == -1) {
        printf("Error opening ntx_io device");	
    }

    int brightness = atoi ( (argv[1]) );
    ioctl(light, 241, brightness);

    return 0;
}
I've attached the source code and the compiled program below.
Attached Files
File Type: zip GloLight.zip (3.2 KB, 870 views)

Last edited by KevinShort; 05-15-2013 at 02:09 PM.
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