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Linux(CentOS) - USB device driver - MODULE_DEVICE_TABLE - probe function

Posted by Mohit Gupta 
I am new to writing USB driver. My current goal is to create usb driver for which probe function is called. I am running linux on windows using VirtualBox. probe function to not called after module is installed.

Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

#include <linux/init.h>             // Macros used to mark up functions e.g., __init __exit
#include <linux/module.h>           // Core header for loading LKMs into the kernel
#include <linux/kernel.h>           // Contains types, macros, functions for the kernel

// Includes for Major/Minor
#include <linux/types.h>
#include <linux/kdev_t.h>
#include <linux/fs.h>     // For registering devices, blocking/non-blocking
#include <asm/uaccess.h>
#include <linux/slab.h>   //Used when kmalloc or kzalloc is called
#include <linux/usb.h>

#define SUCCESS 0
#define DEVICE_NAME "hello_world"
#define BUF_LEN 80

MODULE_LICENSE("GPL"winking smiley;              ///The license type -- this affects runtime behavior
MODULE_AUTHOR("Mohit Gupta"winking smiley;      ///The author -- visible when you use modinfo
MODULE_DESCRIPTION("A simple Hello World USB driver"winking smiley;  ///The description -- see modinfo
MODULE_VERSION("0.1"winking smiley;              ///< The version of the module

static int usb_probe(struct usb_interface* interface, const struct usb_device_id* id)
   printk(KERN_INFO "USBHelloWorld: (%04X:%04X) plugged\n", id->idVendor, id->idProduct);

   return 0;

static void usb_disconnect(struct usb_interface* interface)
   printk(KERN_INFO "USBHelloWorld: USB device removed\n"winking smiley;

/* Table of devices that work with this driver */
static struct usb_device_id usb_table[] = {
  { USB_DEVICE(0x058F, 0x6387) },
  { USB_DEVICE(0x80ee, 0x0021) },  /*VirtualBox USB Tablet*/
  { USB_DEVICE(0x1d6b, 0x0001) },  /*Linux Foundation 1.1 root hub*/
  { 0 }   /* Terminating Entry*/
MODULE_DEVICE_TABLE(usb, usb_table);

static struct usb_driver skel_driver =  {
  .name = "custom_usb_driver",
  .probe = usb_probe,
  .disconnect = usb_disconnect,
  //.fops = &usb_fops,
  // .minor = USB_MINOR_BASE,
  .id_table = usb_table

   __init = After loading this function will be removed as it is not needed any more.
static int __init __usb_init(void)
   int result = 0;
   printk(KERN_ALERT "USBHelloWorld: __usb_init\n"winking smiley;

   result = usb_register(&skel_driver);
   if(result < 0)
     printk(KERN_ALERT "USBHelloWorld: register failed for the driver. Error No\n"winking smiley;
     return -1;

   printk(KERN_ALERT "USBHelloWorld: __usb_init done\n"winking smiley;

   return 0;

   __exit = If module is built directly into kernel or kernel is configured to disallow unloading of modules, functions marked with __exit are simply discarded.
static void __exit  __usb_exit(void)
   printk(KERN_ALERT "USBHelloWorld: Exiting\n"winking smiley;

   /* deregister this driver with the USB subsystem */

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It could an issue with your table, try to catch all USB devices first. This way you'll be sure problem isn't here
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