>> 1) In one of my embedded targets , host and device are hardwired over usb . >> so i want to have programtic equivalent of unplug/plug cycle in usb >> host to check connect / disconnect >> functionality and without using rmmod usb modules on host side . Also >> i donot have control over gadget side . > > You could turn off power to the host. That would have pretty much the > effect you want. But there's no other way to do it. > turn off power to the host ? sorry i didn't get it . is it meant to be "turn off power to the device" ? probably using some specifc /sys/bus/usb/devices/.../power/xxx file , i can turn off power to device ? or i need to use any other kernel api() or userspace interface to achieve this ? >> 2) i want usb host to reenumerate the device . > > If you call usb_reset_device(), the host will read the device > descriptors. But it won't go through a complete re-enumeration unless > the descriptors have changed from their original values. > > If you unbind the host controller from its driver and then rebind it, > every device attached to that host controller will be re-enumerated. > But the devices won't be disconnected from the host. > > Alan Stern > Thanx for the information . Regards Amit Nagal -- 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
