开始啃硬骨头~ 这里我打算一步步给出USB device driver 的demo，希望有心能能够共同交流学习. 希望认识更多对Linux有兴趣的geek.
目前由于环境和自身能力方面原因还没能做实物的测试，篇章的最后打算给出一个在x86上模拟USB读写的driver，以后能够做实物测试之后再更新this blog
我的联系方式：
jasonleaster@gmail.com（由于偶不能登QQ，所以thunder bird的邮件只要电脑开着就一直在线~）
测试环境：
Ubuntu 14.0
kernel: 3.13.0
下面我比较详细的对代码进行了注释，要点都在代码中啦~
这段代码仅仅是个例子，相当于第一个驱动设备hello world一样，力求最简单化概括性的给出USB设备插入，拔出相关的处理过程，后面慢慢的写的更深入的时候，代码也就越来越”复杂“
我整理了USB device driver 代码相关的结构体，做了目录便于查阅
/**************************************************************
code writer : EOF
code date : 2014.08.18
code file : ./USB_1/usb_1.c
e-mail : jasonleaster@gmail.com
code purpose:
This is a demo for how to code for a USB device driver.
If there is something wrong with my code, please touch
me by e-mail. Thank you.
*************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
/*
** This two Macro used to create a structure --
** 'usb_device_id' by 'USB_DEVICE'
*/
#define VENDOR_ID 0x08f7
#define PRODUCT_ID 0x0002
#define DEVICE_NAME "usb_1"
MODULE_AUTHOR("EOF");
MODULE_LICENSE("Dual BSD/GPL");
/*
** id_table stored many USB device's 'usb_device_id' structure
*/
static struct usb_device_id id_table[] =
{
{ USB_DEVICE(VENDOR_ID, PRODUCT_ID)},
{ },
};
/*
** The 'MODULE_DEVICE_TABLE' Macro marks device in the
** module image so that the module can be loaded on demand if
** the device is hotplugged.
*/
MODULE_DEVICE_TABLE(usb,id_table);
/*
** The probe() method is invoked by khubd after device enumeration.
**
** @interface :contains information gleaned during the
** enumeration process.
**
** @id : the entry in the driver's 'usb_device_id' table
** that matches the values read from the USB-device.
**
*/
static int usb_probe(struct usb_interface * interface,
const struct usb_device_id *id)
{
dev_info(&interface->dev,"USB device now attached\n");
return 0;
}
/*
** disconnect() method is called when the device is unplugged or
** when the module is unloaded.
*/
static void usb_disconnect(struct usb_interface* interface)
{
dev_info(&interface->dev,"USB device now disconnect\n");
}
/*
** Each USB device has a 'usb_driver' data structure.
*/
static struct usb_driver usb_driver =
{
.name = DEVICE_NAME,
.probe = usb_probe,
.disconnect = usb_disconnect,
.id_table = id_table,
};
static int usb_init(void)
{
return usb_register(&usb_driver);
}
static void usb_exit(void)
{
usb_deregister(&usb_driver);
}
module_init(usb_init);
module_exit(usb_exit);
衡山日出
Program for Linux USB-devices driver step by step (ONE),布布扣,bubuko.com
Program for Linux USB-devices driver step by step (ONE)
原文地址：http://blog.csdn.net/cinmyheart/article/details/38651019
