demo_brightness.c

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/****************************************************************************
* Copyright (c) Advantech Co., Ltd. All Rights Reserved
*
* File Name:
*       demo_brightness.c
*
* Programmers:
*       Neo Lo
*
****************************************************************************/

#include <stdio.h>
#include <stdlib.h>

#include "REL_Linux_SUSI.H"

// Return 0 if platform infomation is correctly obtained.
// Otherwise, return 1.
int show_platform_info(void)
{
        int result;
        DWORD major, minor, year, month, date;
        const int BUF_LENGTH = 128;
        TCHAR buf[BUF_LENGTH];  // Buffer length includes the null character.

        SusiDllGetVersion(&major, &minor);
    year    = minor/10000;
    month   = minor%10000/100;
    date    = minor%100;
        printf("Version: %li (20%02li/%02li/%02li)\n", major, year, month, date);

        // Get platform name.
        result = SusiGetPlatformName(buf, BUF_LENGTH);
        if (result < 0) {
                printf("SusiGetPlatformName() failed\n");
                return 1;
        }
        else if (result > 0) {
                printf("SusiGetPlatformName(): buffer is too short\n");
                return 1;
        }
        else
                printf("Platform name: %s\n", buf);

        // Get BIOS version.
        result = SusiGetBIOSVersion(buf, BUF_LENGTH);
        if (result < 0) {
                return 1;
        }
        else if (result > 0) {
                printf("SusiGetBIOSVersion(): buffer is too short\n");
                return 1;
        }
        else
                printf("BIOS version: %s\n", buf);

        return 0;
}

void show_menu(void)
{
        printf("\n");
        printf("0) Terminate this program\n");
        printf("1) Get brightness range\n");
        printf("2) Get brightness value\n");
        printf("3) Set brightness value\n");
        printf("Enter your choice: ");
}

// Return 0 on success and 1 on failure.
int get_bright_rang(void)
{
        int result;
        BYTE minimum, maximum, stepping;

    minimum = maximum = stepping = 0;
        result = SusiVCGetBrightRange(&minimum, &maximum, &stepping);
        if (result == FALSE) {
                printf("SusiVCGetBrightRange() failed\n");
                return 1;
        }
        else
        {
                printf("(minimum, maximum, stepping) = (%i, %i, %i)\n", minimum, maximum, stepping);
        }
    
        return 0;
}

// Return 0 on success and 1 on failure.
int get_bright(void)
{
        int result;
    BYTE brightness = 0;

        result = SusiVCGetBright(&brightness);
        if (result == FALSE) {
                printf("SusiVCGetBright() failed\n");
                return 1;
        }
        else
                printf("Value: %i\n", brightness);
        return 0;
}

// Return 0 on success and 1 on failure.
int set_bright(void)
{
        int result;
        int brightness = 0;

        printf("Brightness Value: ");
        if (scanf("%i", &brightness) <= 0)
                return 1;
        result = SusiVCSetBright(brightness);
        if (result == FALSE) {
                printf("SusiVCSetBright() failed\n");
                return 1;
        }
        return 0;
}

int main(void)
{
        int result, done, op;

        result = SusiDllInit();
        if (result == FALSE) {
                printf("SusiDllInit() failed\n");
                return 1;
        }

        result = SusiVCAvailable();
        if ((result & VC_BRIGHT_CTL_SUPPORT) == 0) {
                printf("SusiVCAvailable() = %d failed\n", result);
                SusiDllUnInit();
                return 1;
        }

        result = show_platform_info();

        done = 0;
        while (! done) {
                show_menu();
                if (scanf("%i", &op) <= 0)
                        op = -1;

                switch (op) {
                case 0:
                        done = 1;
                        continue;
                case 1:
                        result = get_bright_rang();
                        break;
                case 2:
                        result = get_bright();
                        break;
                case 3:
                        result = set_bright();
                        break;
                default:
                        printf("\nUnknown choice!\n\n");
                        continue;
                }
                if (done != 1 && result < 0) {
                        SusiDllUnInit();
                        return 1;
                }
        }

        result = SusiDllUnInit();
        if (result == FALSE) {
                printf("SusiDllUnInit() failed\n");
                return 1;
        }

        return 0;
}