HP Visualize c360 PA-RISC Visualize Workstation Universal Serial Bus - Page 20

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 implemented 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 topological location).