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Start documenting UHS (USB Host Stack)
/dev/uhs is the IOSU device node for USB. 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.
==ioctl() interface==
===0x11 - UhsQueryInterfaces()===
This function appears to be used to determine which USB device interfaces are plugged in and available. IOS_Ioctl() with this code returns the number of USB devices plugged in.
==ioctl() interface==
===0x11 - UhsQueryInterfaces()===
This function appears to be used to determine which USB device interfaces are plugged in and available. IOS_Ioctl() with this code returns the number of USB devices plugged in.