Hi Amit, How is the USB connected in your system Is it through some USB controller, or directly to some CPU GPIO pins, you can program CPU registers to power down but you need to check the CPU spec, this in effect will bring the power down. If it is connected through some USB controller you can check the Spec, they have such commands to power down the controller. regards Suman On Thu, Jun 16, 2011 at 1:25 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Thu, 16 Jun 2011, Amit Nagal wrote: > >> ok lastly , is it possible to poweroff a usb port from host software >> for eg similar to the case >> where a usb host can turn off port power if too much current is drwan >> by the device ? > > It depends on the port hardware. The hardware normally used in desktop > and laptop USB host controllers does not allow it. The hardware used > in most external hubs does not allow it, although a few types of hub > do. I don't know about the hardware in a typical SOC. > > Alan Stern > > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Rgds Vijayendra Suman -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
