pen_info.c

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

static struct usb_device *device;

static int pen_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
    struct usb_host_interface *iface_desc;
    struct usb_endpoint_descriptor *endpoint;
    int i;

    iface_desc = interface->cur_altsetting;
    printk(KERN_INFO "Pen i/f %d now probed: (%04X:%04X)\n",
           iface_desc->desc.bInterfaceNumber,
           id->idVendor, id->idProduct);
    printk(KERN_INFO "ID->bNumEndpoints: %02X\n",
           iface_desc->desc.bNumEndpoints);
    printk(KERN_INFO "ID->bInterfaceClass: %02X\n",
           iface_desc->desc.bInterfaceClass);

    for (i = 0; i < iface_desc->desc.bNumEndpoints; i++)
    {
        endpoint = &iface_desc->endpoint[i].desc;

        printk(KERN_INFO "ED[%d]->bEndpointAddress: 0x%02X\n",
               i, endpoint->bEndpointAddress);
        printk(KERN_INFO "ED[%d]->bmAttributes: 0x%02X\n",
               i, endpoint->bmAttributes);
        printk(KERN_INFO "ED[%d]->wMaxPacketSize: 0x%04X (%d)\n",
               i, endpoint->wMaxPacketSize,
               endpoint->wMaxPacketSize);
    }

    device = interface_to_usbdev(interface);
    return 0;
}

static void pen_disconnect(struct usb_interface *interface)
{
    printk(KERN_INFO "Pen i/f %d now disconnected\n",
           interface->cur_altsetting->desc.bInterfaceNumber);
}

static struct usb_device_id pen_table[] =
    {
        {USB_DEVICE(0x0781, 0x5567)},
        {} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, pen_table);

static struct usb_driver pen_driver =
    {
        .name = "pen_info",
        .probe = pen_probe,
        .disconnect = pen_disconnect,
        .id_table = pen_table,
};

static int __init pen_init(void)
{
    return usb_register(&pen_driver);
}

static void __exit pen_exit(void)
{
    usb_deregister(&pen_driver);
}

module_init(pen_init);
module_exit(pen_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harsha Priya");
MODULE_DESCRIPTION("USB Pen Info Driver");