usb-pkk-backlight.h v4

#define PKK_BL_DRIVER_NAME "USB PKK-BL Driver: "

#define PKK_BL_MAX_BRIGHTNESS   0xff
#define PKK_BL_DEFAULT_BRIGHTNESS 0xff

#define USB_VENDOR_ID_PKK_BL     0x04d8
#define USB_DEVICE_ID_PKK_BL     0xc002

#define PKK_BL_OUT_ENDPOINT 0x01

#define PKK_BL_OUT_INTERVAL 1

#define PKK_BL_TRANSFER_BUFFER_OUT_SIZE 2

#define PKK_BL_CMD_SET_BRIGHTNESS 0x91

/* Per device data structure */
struct pkk_bl_data {
    /* USB device stuff section */
    struct usb_device_id *udev_id;
    struct usb_device *udev;
    struct usb_interface *intf;
    struct urb *urb;
    //bool is_urb_free;
    unsigned char *transfer_buffer_out;

    /* Backlight device stuff section */
    struct backlight_device *bdev;
    uint8_t brightness; //PicoLCD - u8
};