usb 设备驱动程序简介

来源：互联网发布：windows 远程桌面软件编辑：程序博客网时间：2024/05/16 01:11

驱动程序描述

struct usb_driver

{

   const char *name;驱动程序名字

   int (*probe) (struct usb_interface *intf,
              const struct usb_device_id *id);当usb核心发现该驱动能够处理的usb接口时，调用该函数

   void (*disconnect) (struct usb_interface *intf);相应usb接口移除时调用该函数

   int (*ioctl) (struct usb_interface *intf, unsigned int code,
           void *buf);

   int (*suspend) (struct usb_interface *intf, pm_message_t message);
   int (*resume) (struct usb_interface *intf);
   int (*reset_resume)(struct usb_interface *intf);

   int (*pre_reset)(struct usb_interface *intf);
   int (*post_reset)(struct usb_interface *intf);

   const struct usb_device_id *id_table;usb驱动能够处理的设备列表

   struct usb_dynids dynids;
   struct usbdrv_wrap drvwrap;
   unsigned int no_dynamic_id:1;
   unsigned int supports_autosuspend:1;
   unsigned int soft_unbind:1;

};

usb设备列表

struct usb_device_id {
   /* which fields to match against? */
   __u16       match_flags;

   /* Used for product specific matches; range is inclusive */
   __u16       idVendor;制造商id
   __u16       idProduct;产品id
   __u16       bcdDevice_lo;
   __u16       bcdDevice_hi;

   /* Used for device class matches */
   __u8       bDeviceClass;
   __u8       bDeviceSubClass;
   __u8       bDeviceProtocol;

   /* Used for interface class matches */
   __u8       bInterfaceClass;
   __u8       bInterfaceSubClass;
   __u8       bInterfaceProtocol;

   /* not matched against */
   kernel_ulong_t   driver_info;

};

构造一个usb_device_id

USB_DEVICE(vend,prod)

构造一类usb_device_id

USB_INTERFACE_INFO(cl,sc,pr)

cl:blnterfaceclass value

sc:blnterfacesubclass value

pr:blnterfaceprotocol value

注册驱动

static inline int sub_register(struct usb_driver *driver)