On Tue, 14 Jun 2011, Amit Nagal wrote: > Hi , > > > How can a usb host disconnect a usb device without unplug of usb cable ? What exactly do you mean by "disconnect"? > for eg i mean something similar to usb_gadget_disconnect() api > available on gadget side . That API causes the gadget to remove its terminations and pullup resistors from the bus data lines. Nothing the host does can cause that to happen. > can usb host also actually disconnect a usb device at will without > cable unplug ? This is the same as the question you asked above. > is it possible to do entirely in software or support from hardware > also is required ? Again, it depends on what you mean by "disconnect". > what interfaces in userspace or kernel can be used if possible ? There's the /sys/bus/usb/devices/.../remove attribute file. Writing to this file is roughly equivalent to pressing the "Safely remove hardware" button in Windows. But it isn't like physically unplugging the USB cable. 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
