[36078.726962] usb 1-2: USB disconnect, device number 24
[36080.925619] usb 1-2: new full-speed USB device number 25 using xhci_hcd
[36081.067062] usb 1-2: New USB device found, idVendor=0483, idProduct=5750
[36081.067067] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[36081.067071] usb 1-2: Product: CHW20160112 HID
[36081.067075] usb 1-2: Manufacturer: Chuanghongweitech1
[36081.068695] input: Chuanghongweitech1 CHW20160112 HID as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:0483:5750.0018/input/input40
[36081.069072] hid-generic 0003:0483:5750.0018: input,hidraw2: USB HID v1.10 Device [Chuanghongweitech1 CHW20160112 HID] on usb-0000:00:14.0-2/input0

[36216.554620] ledbadge:, Unloading module. Handler: ledbadge_exit
[36216.554620] ledbadge:, Attempting to deregister USB device.
[36216.554621] usbcore: deregistering interface driver ledbadge
[36216.554647] ledbadge:, Leaving module!
[36217.632615] ledbadge:, Loading module. Handler: ledbadge_init
[36217.632616] ledbadge:, Attempting to register USB device.
[36217.632636] usbcore: registered new interface driver ledbadge

#include <linux/init.h>
#include <linux/module.h>
#include <linux/usb.h>



#define LEDBADGE_VENDOR_ID  0x0483
#define LEDBADGE_PRODUCT_ID 0x5750
#define LEDBADGE_MOD_NAME   "ledbadge"
#define LEDBADGE_DRV_NAME   "ledbadge"


/************* usb operations *************/

/*
    ledbadge_probe

        called when plugging the USB device */


static int ledbadge_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
    printk(KERN_NOTICE "Led Badge driver (%04X: %04X) plugged n", id->idVendor, id->idProduct);
    return 0;
}


/*
    ledbadge_disconnect

        called when unplugging the USB device */

static void ledbadge_disconnect(struct usb_interface *interface)
{
    printk(KERN_NOTICE "%s:, ledbage USB device removed", LEDBADGE_DRV_NAME);
}




/************* usb driver *************/

// information required to recognize the device

static struct usb_device_id ledbadge_table [] = {
    {USB_DEVICE(LEDBADGE_VENDOR_ID, LEDBADGE_PRODUCT_ID)},
    { }, // terminating entry
};
MODULE_DEVICE_TABLE(usb, ledbadge_table);


static struct usb_driver ledbadge_driver = {
    .name = LEDBADGE_DRV_NAME,
    .id_table = ledbadge_table,
    .probe = ledbadge_probe,
    .disconnect = ledbadge_disconnect,
};








/************** module definition **************/

/* ledbadge_init

        caled on module loading */

static int __init ledbadge_init(void)
{
    int ret = -1;

    printk(KERN_NOTICE "%s:, Loading module. Handler: %s",
             LEDBADGE_MOD_NAME, __FUNCTION__);

    printk(KERN_NOTICE "%s:, Attempting to register USB device.", LEDBADGE_MOD_NAME);

    // attempt to register usb device
    ret = usb_register(&ledbadge_driver);

    // log dmesg of status
    if(ret == 0) printk(KERN_NOTICE "%s:, Device registered!", LEDBADGE_MOD_NAME);
    else         printk(KERN_ERR    "%s:, Device registration failed > %d", LEDBADGE_MOD_NAME, ret);

    return ret;
}

/* ledbadge_exit

        caled on module unloading */

static void __exit ledbadge_exit(void)
{
    printk(KERN_NOTICE "%s:, Unloading module. Handler: %s",
             LEDBADGE_MOD_NAME, __FUNCTION__);

    printk(KERN_NOTICE "%s:, Attempting to deregister USB device.", LEDBADGE_MOD_NAME);

    // attempt to deregister usb device
    usb_deregister(&ledbadge_driver);

    // log dmesg of status
    printk(KERN_NOTICE "%s:, Leaving module!", LEDBADGE_MOD_NAME);
}

module_init(ledbadge_init);
module_exit(ledbadge_exit);

MODULE_LICENSE("GPL");