How to reset a USB device

For example, I have a device connected to a hub on port 1.  I want to reset the device (make the device reenumerate).  I know the hub\'s symbolic name.  Is there a IOCTL I can use to send to hub to reset the device on port 1?

thanks a lot

哪一端是你做的?HOST OR CLIENT?如果是HOST,向HUB发送一个PORT RESET命令就可以了,具体的命令格式见协议的11章(或是12章)的HUB类命令.这是标准命令.

thanks metalwing.  Sorry I need input english.  No chinese input installed on my computer.

What I really want to do is from the user mode, I can get the handle of a USB hub, and I know the port number also.

I want reset any device on that port.

I noticed that wxp ddk has IOCTL_USB_HUB_CYCLE_PORT.  But no documents.  Any suggestions?

没关系.只要你看的懂中文就行了,我的E文我自己都看不懂.
USB的对HUB的STANDARD REQ有一个命令:23 03 00 04 XX XX XX XX
这个命令表示设置HUB的某个PORT的RESET FEATURE.当这个PORT的
RESET FEATURE设置了后,该PORT复位,连接到该PORT的设备也就复位.
具体的你可以看USB协议的11.24,关于SETFEATURE命令在11.24.2.13.

How to send \"STANDARD REQ有一个命令:23 03 00 04 XX XX XX XX
\" from the user mode?

你说的这个USER MODE(用户模式)是个什么模式?CLIENT OR HOST?
你做的是设备(DEVICE)还是接口(HUB OR HOST)?

回家了可以发中文了.

我说的user mode 是指windows应用程序. 我想写个应用程序来reset device (任意设备).  我可以拿到hub的symbolic name,我createfile 得到handle,我想用deviceIOControl send 一个IOCTL 来reset port.

我的问提是,这样作可行么?  如果不行,我是不是要从写hubhub.sys?