pihwm.c

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#include <stdio.h>
#include <stdlib.h>
#include <linux/types.h>
#include "pihwm.h"

board_t
board_info ()
{
    FILE *info;
    char rev_hex[5];
    unsigned int rev_int = 0;

    board_t board;
    board.model = -1;
    board.rev = -1;
    board.mem = -1;

    char *cmd = "cat /proc/cpuinfo | grep 'Revision' | awk '{print $3}'";

    if( !(info = popen(cmd, "r")) )
    {
        return board;
    }

    fgets(rev_hex, 5, info);
    sscanf(rev_hex, "%x", &rev_int);

    // Data from: http://raspberryalphaomega.org.uk/?p=428 
    switch(rev_int){
        case 2:
        case 3:
            board.model = MODEL_B;
            board.rev = REV_1;
            board.mem = MEM_256;
            break;

        case 4:
        case 5:
        case 6:
            board.model = MODEL_B;
            board.rev = REV_2;
            board.mem = MEM_256;
        break;

        case 7:
        case 8:
        case 9:
            board.model = MODEL_A;
            board.rev = REV_2;
            board.mem = MEM_256;
        break;

        case 13:
        case 14:
        case 15:
            board.model = MODEL_B;
            board.rev = REV_2;
            board.mem = MEM_512;
        break;

    default:
        // Default values (-1) already set.
        break;
    }

    return board;

}

int
board_model ()
{
    board_t b = board_info();
    return b.model;
}

int
board_rev ()
{
    board_t b = board_info();
    return b.rev;
}

int
board_mem ()
{
    board_t b = board_info();
    return b.mem;
}

int
check_kernel_module (char* modulename)
{
    FILE *lsmod;
    char cmd[100];
    char modcount[2];
    unsigned int modcount_int = 0;

    sprintf(cmd, "lsmod | grep %s | wc -l", modulename); 

    if( !(lsmod = popen(cmd, "r")) )
    {
        return -1;
    }

    fgets(modcount, 2, lsmod);
    modcount_int = atoi(modcount);

    if ( modcount_int > 0 )
    {
        return 1;
    }
    else
    {
        return -1;
    }

}