usb驱动代码

这是一个比较广泛的话题，因为USB驱动代码可以应用于各种不同类型的设备。下面是一个简单的示例代码，可以用于Linux系统中的USB HID设备：

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

static struct usb_device_id usb_hid_id_table[] = {
    { USB_INTERFACE_INFO(
        USB_INTERFACE_CLASS_HID, 
        USB_INTERFACE_SUBCLASS_BOOT, 
        USB_INTERFACE_PROTOCOL_KEYBOARD) },
    { },
};
MODULE_DEVICE_TABLE(usb, usb_hid_id_table);

static int usb_hid_probe(struct usb_interface *interface, 
                         const struct usb_device_id *id)
{
    struct usb_device *udev = interface_to_usbdev(interface);
    struct hid_device *hid;
    int ret;

    hid = hid_allocate_device();
    if (!hid) {
        dev_err(&interface->dev, "failed to allocate HID device\n");
        return -ENOMEM;
    }

    hid->dev.parent = &interface->dev;
    hid->dev.bus = &usb_bus_type;
    hid->dev.type = &hid_input;
    hid->dev.release = hid_input_release;
    hid->ll_driver = &hid_usb_driver;
    hid->hiddev_rsize = 64;
    hid->hiddev_rdesc_size = 1024;

    hid->dev.platform_data = udev;

    ret = hid_parse(udev, hid);
    if (ret) {
        dev_err(&interface->dev, "failed to parse HID descriptor\n");
        hid_destroy_device(hid);
        return ret;
    }

    ret = hid_hw_start(hid, HID_CONNECT_HIDRAW);
    if (ret) {
        dev_err(&interface->dev, "failed to start HID hardware\n");
        hid_destroy_device(hid);
        return ret;
    }

    usb_set_intfdata(interface, hid);

    dev_info(&interface->dev, "USB HID device detected\n");

    return 0;
}

static void usb_hid_disconnect(struct usb_interface *interface)
{
    struct hid_device *hid = usb_get_intfdata(interface);

    usb_set_intfdata(interface, NULL);

    hid_hw_stop(hid);
    hid_destroy_device(hid);

    dev_info(&interface->dev, "USB HID device disconnected\n");
}

static struct usb_driver usb_hid_driver = {
    .name = "usb_hid",
    .probe = usb_hid_probe,
    .disconnect = usb_hid_disconnect,
    .id_table = usb_hid_id_table,
};

static int __init usb_hid_init(void)
{
    return usb_register(&usb_hid_driver);
}

static void __exit usb_hid_exit(void)
{
    usb_deregister(&usb_hid_driver);
}

module_init(usb_hid_init);
module_exit(usb_hid_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("USB HID driver for Linux");

该示例代码使用了Linux内核中的HID子系统，它可以处理各种类型的USB HID设备。在probe函数中，它分配了一个HID设备对象，并进行了一系列的初始化操作。然后，它使用hid_parse函数解析设备的HID描述符，并启动HID硬件设备。在disconnect函数中，它停止了HID硬件设备，并释放了HID对象。整个驱动程序都是基于Linux内核模块，可以通过insmod和rmmod命令进行加载和卸载。