#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
//传输变量
#define BULKOUT_BUFFER_SIZE 512
char *bulkout_buffer;
//usb设备定义
struct usb_device *udev;
//保存端点
__u8 bulk_out_endaddr；
static struct usb_device_id dnw_id_table[] = {
//获取USB设备ID
{ USB_DEVICE(,) },//通过lsusb获取
{}
};
static int dnw_open(struct inode* inode, struct file *file)
{
//申请拷贝空间
bulkout_buffer = kmalloc(BULKOUT_BUFFER_SIZE,GFP_KERNEL);
return 0;
}
static int dnw_release(struct inode* inode, struct file *file)
{
//释放拷贝空间
kfree(bulkout_buffer);
return 0;
}
static ssize_t dnw_write(struct file *file, const char __user *buf, size_t len, loff_t *pos)
{
size_t to_write;
size_t total_write = 0;
size_t act_len;
while(len>0)
{
to_write = min((size_t)len,BULKOUT_BUFFER_SIZE);
copy_from_user(bulkout_buffer+total_write,buf);
usb_bulk_msg(udev,usb_sndbulkpipe(udev,bulk_out_endaddr),bulkout_buffer,to_write,&act_len,3*HZ);//（2）获取端点信息
len -= to_write;
total_write += to_write;
}
return total_write;
}
static struct file_operations dnw_ops =
{
.owner = THIS_MODULE,
.write = dnw_write,
.open = dnw_open,
.release = dnw_release,
};
static struct usb_class_driver dnw_class = {
.name = "dnw%d";
.fops = &dnw_ops;
.minor_base = 100;
};
static int usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
int i = 0;
//接口设置描述
struct usb_host_interface *interface;
/* 端点描述符 */
struct usb_endpoint_descriptor *endpoint;
interface = intf->cur_altsetting;
// interface->desc.bNumEndpoints;
/* 获取端点0描述符 */
// endpoint = &interface->endpoint[0].desc;
for(i=0;i<interface->desc.bNumEndpoints;i++)
{
endpoint = &interface->endpoint[i].desc;
//判断bulk_out端点
if(usb_endpoint_is_bulk_out(endpoint))
{
bulk_out_endaddr = endpoint->bEndpointAddress;
break;
}
}
usb_register_dev(intf,&dnw_class);
usb_get_dev( interface_to_usbdev(intf) );
}
static void dnw_disconnect(struct usb_interface *intf)
{
usb_deregister_dev(intf,&dnw_class);
}
//usb结构体初始化
static struct usb_driver dnw_driver = {
.name = "dnw", /* 驱动名 */
.probe = dnw_probe, /* 捕获函数 */
.disconnect = dnw_disconnect, /* 卸载函数 */
.id_table = dnw_id_table, /* 设备列表 */
};
int dnw_init()
{
//usb注册
usb_register(&dnw_driver);
return 0;
}
void dnw_exit()
{
usb_deregister(&dnw_driver);
}
module_init(dnw_init);
module_exit(dnw_exit);
//支持协议
MODULE_LICENSE("GPL");
