編寫Linux下Input裝置的檢測程式

    最近玩了下Android-x86的eclair，主題風格相對之前的1.6好看了很多，而且還加了不少之前沒有的功能。但是觸控螢幕不能用，在終端下用getevent命令查看事件資訊，發現得到的絕對座標有很大出入（4096*4096）。於是想自己試著去解決這個問題。同時在Ubuntu下測試，發現居然沒有getevent命令，當然可以用cat /dev/inpu/eventX查看事件資訊，但是顯示出來的是一堆亂碼，怎麼辦？那就自己編寫個Linux輸入裝置的測試小程式來檢測問題所在吧，最後測試結果發現和在Android下一樣的問題-沒有校正，總算也小有成就。接下來應該再dig觸控螢幕的校正問題：-)

現在把寫的測試程式放上來供大家參考：
代碼中宏定義KEY_DEV、MOU_DEV、TOUS_DEV、TOUP_DEV是Linux下鍵盤，滑鼠，觸控螢幕和觸摸板的裝置檔案路徑，對於不同的系統和機器可能有所不同，大家可以用cat /proc/bus/input/devices查看自己機器的裝置檔案。

用gcc -o outfilename filename編譯產生可執行檔，然後./outfilename運行檔案，注意修改產生的可執行檔許可權，不想修改許可權的用sudo ./outfilename。目前還沒加入測試過程中切換測試裝置的功能，只能用CTRL+Z結束程式，再重新執行檔案。有時間可以再摸索下加個這個功能，呵呵~~

#include
#include
#include
#include
#include
#define KEY_DEV "/dev/input/event5"
#define MOU_DEV "/dev/input/event6"
#define TOUS_DEV "/dev/input/event7"
#define TOUP_DEV "/dev/input/event11"

static int ts_fd = -1;
static struct input_event data;

static int init_device(char *TS_DEV)
{
    if((ts_fd = open(TS_DEV, O_RDONLY)) < 0)
    {
        printf("Error open %s/n/n", TS_DEV);
        return -1;
    }
    return ts_fd;
}

static int test_key()
{
    if(init_device(KEY_DEV) < 0)
        return -1;
    while(1)
    {
        read(ts_fd, &data, sizeof(data));
        if (data.type == EV_KEY)
            printf(" type: EV_KEY, event = %d, value = %d/n",data.code, data.value);
    }
    return 0;
}

static int test_mouse()
{
    if(init_device(MOU_DEV) < 0)
        return -1;
    while(1)
    {
        read(ts_fd, &data, sizeof(data));
        if (data.type == EV_KEY)
        {
            printf(" type = EV_KEY, code = %s, value = %d/n",
                data.code == BTN_LEFT ? "MOUSE_LEFT" :
                data.code == BTN_RIGHT ? "MOUSE_RIGHT" :
                data.code == BTN_MIDDLE ? "MOUSE_MIDDLE" :
                data.code == BTN_SIDE ? "MOUSE_SIDE" :
                "Unkonw", data.value);
        }
        else if(data.type == EV_REL)
        {
            printf(" type = EV_ABS, code = %s, value = %d/n",
                data.code == REL_X ? "ABS_X" :
                data.code == REL_Y ? "ABS_Y" :
                data.code == ABS_WHEEL ? "MOUSE_WHEEL" :
                data.code == ABS_PRESSURE ? "ABS_PRESSURE" :
                "Unkown", data.value);
        }
    }
    return 0;
}

static int test_touch_screen()
{
    if(init_device(TOUS_DEV) < 0)
        return -1;
    while(1)
    {
        read(ts_fd, &data, sizeof(data));
        if (data.type == EV_KEY)
        {
            printf(" type: EV_KEY, event = %s, value = %d/n/n",
                data.code == BTN_TOUCH ? "BTN_TOUCH" : "Unkown", data.value);
        }
        else if(data.type == EV_ABS)
        {
            printf(" type: EV_ABS, event = %s, value = %d/n/n",
                data.code == ABS_X ? "ABS_X" :
                data.code == ABS_Y ? "ABS_Y" :
                data.code == ABS_PRESSURE ? "ABS_PRESSURE" :
                "Unkown", data.value);
        }
    }
    return 0;
}

static int test_touch_pancel()
{
    if(init_device(TOUP_DEV) < 0)
        return -1;
    while(1)
    {
        read(ts_fd, &data, sizeof(data));
        if (data.type == EV_KEY)
        {
            printf(" type = EV_KEY, code = %s, value = %d/n",
                data.code == BTN_LEFT ? "MOUSE_LEFT" :
                data.code == BTN_RIGHT ? "MOUSE_RIGHT" :
                data.code == BTN_MIDDLE ? "MOUSE_MIDDLE" :
                data.code == BTN_SIDE ? "MOUSE_SIDE" :
                "Unkonw", data.value);
        }
        else if(data.type == EV_REL)
        {
            printf(" type = EV_ABS, code = %s, value = %d/n",
                data.code == REL_X ? "ABS_X" :
                data.code == REL_Y ? "ABS_Y" :
                data.code == ABS_WHEEL ? "MOUSE_WHEEL" :
                data.code == ABS_PRESSURE ? "ABS_PRESSURE" :
                "Unkown", data.value);
        }
    }
    return 0;
}

int main()
{
    static int i;
select:    printf("Please select device:/n0.KeyBoard/n1.Mouse/n2.TouchScreen/n3.TouchPancel/n");
    scanf("%d",&i);
    switch(i){
        case 0:
            test_key();
            break;
        case 1:
            test_mouse();
            break;
        case 2:
            test_touch_screen();
            break;
        case 3:
            test_touch_pancel();
            break;
        default:
            printf("Wrong device, Please select again!/n/n");
            break;       
    }
    goto select;
        return 0;
}