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/dev/usb/shared is an internal IOS device which is only used by the WFSI module in IOS59.
Only IOS_OPEN, IOS_CLOSE and IOS_IOCTL are valid commands. The other commands immediately return IPC_EINVAL (-4). Additionally, this device cannot be opened from the PPC (IPC_EACCES).
There is only a single ioctl for this device.
This ioctl checks the size of the resource manager and fails with IPC_EINVAL if there is a mismatch. Also, the output buffer must be in mem2.
/dev/wfsi uses this ioctl for AllocDecryptBufferAddress.