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/dev/uhs is the IOSU device node for the USB Host Stack (UHS). It provides an interface for low-level USB device access, which [[nsysuhs.rpl]] exposes to the [[Cafe OS]] userspace. The interface is opened through /dev/uhs/%d, where %d is an integer representing something (controller number?). Only 0 can be opened, as 1 returns access denied and further values do not exist as device nodes. Once opened, ioctl() requests can be issued to the interface, which are documented below.

/dev/uhs is the IOSU device node for the USB Host Stack (UHS). It provides an interface for low-level USB device access, which [[nsysuhs.rpl]] exposes to the [[Cafe OS]] userspace. The interface is opened through /dev/uhs/%d, where %d is an integer representing controller number. 0 is the controller for the external USB ports, and 1 is for internal USB devices (USB Ethernet, Bluetooth module, and DRH) only usable inside IOSU. Once opened, ioctl() requests can be issued to the interface, which are documented below.

==ioctl() interface==

==ioctl() interface==