怎样添加一个自定义的LED灯？

1. 修改如下两个文件：
    alps/mediatek/custom/common/kernel/leds/inc/cust_leds.h
    -----------------------------------------------------------
    enum mt65xx_led_type
    {
        MT65XX_LED_TYPE_RED = 0,
        ... ...
        MT65XX_LED_TYPE_LCD,
        MT65XX_LED_TYPE_ABC,        // Add a new LED type
        MT65XX_LED_TYPE_TOTAL,
    };

   alps/mediatek/custom/YOUR_PRJ/kernel/leds/mt65xx/cust_leds.c
    ----------------------------------------------------------------
    static struct cust_mt65xx_led cust_led_list[MT65XX_LED_TYPE_TOTAL] = {
        {"red",               MT65XX_LED_MODE_NONE, -1,{0}},
        ... ...
        {"lcd-backlight",     MT65XX_LED_MODE_CUST, (int)Cust_SetBacklight,{0}},

        // Set LED params, Please refer to <Driver all in One>
        {"abc-backlight", MT65XX_LED_MODE_CUST, (int)Cust_SetBacklight_abc,{0}},
    };
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2. 重新编译后，在Kernel log 里可以看到如下信息:
--------------------------------------------------------------------
    <7>[    1.021967] (0)Registered led device: button-backlight
    <7>[    1.022013] (0)Registered led device: lcd-backlight
    <7>[    1.022072] (0)Registered led device: abc-backlight   // <------- !

3. 用如下命令查看新LED的 sysfs节点
adb shell ls /sys/devices/platform/leds-mt65xx/leds/
------------------------------------------------------------------------
    abc-backlight
    button-backlight
    lcd-backlight

补充：移动开发 , Android ,