PA-RISC Visualize Workstation Universal Serial Bus



USB Support: HP-UX Kernel (cont.)
• Only OCHI controllers are supported, and all tested to date work (although some
will appear in ioscan as “unsupported”). HP-UX support for UHCI, although not
currently scheduled, will be necessary at or before IA-64.
• USB drivers are implemented as WSIO drivers. Big-little endian conversion is
handled transparently. Code is multi-thread and multi-processor safe.
• Although libraries have been added for USB support, the drivers are imple-
mented such that standard commands required essentially no modification.
• Standard user-space I/O calls: open( ), close( ), ioctl( ), read( ), select( ), but not
write( ) (yet, because Hub and HID Class require no “write”). These calls only
access Class drivers. User-space I/O to the raw bus is not supported.
• USB-specific Class developer calls: pipe management (13), data transfer (8),
device management (13), device enumeration (2)
• Include files: kernel - hid.h, usb.h, usbio.h, user-space - hidio.h
• Minor number format is based on logical device enumeration (and not topologi-
cal location).