linux usb role switch

we can switch usb role in user space by this module.

cdsn3 has used usb role switch module.

1. kernel config

Device Drivers  --->

    [*] USB support  --->

          -*-   USB Role Switch Support

CONFIG_USB_ROLE_SWITCH: 

USB Role Switch is a device that can select the USB role - host or        

device - for a USB port (connector). In most cases dual-role capable    

USB controller will also represent the switch, but on some platforms   

multiplexer/demultiplexer switch is used to route the data lines on    

the USB connector between separate USB host and device controllers.

2. code

drivers/usb/roles/

class.c  intel-xhci-usb-role-switch.c  Kconfig  Makefile

3. user space(sysfs)

switch usb role mode, base on cdns3 usb.

first, we need to confi

最后

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