The usbkbm STREAMS module processes byte streams generated by a keyboard attached to a USB port. USB keyboard is a member of Human Interface Device (HID) Class, and usbkbm only supports the keyboard protocol defined in the specification. Definitions for altering keyboard translation and reading events from the keyboard are in <sys/kbio.h> and <sys/kbd.h>.
The usbkbm STREAMS module adheres to the interfaces exported by kb(7M). Refer to the DESCRIPTION section of kb(7M) for a discussion of the keyboard translation modes and the IOCTL section for the supported ioctl(2) requests.
USB Keyboard usbkbm returns different values for the following ioctls than kb(7M):
This ioctl() returns a new keyboard type defined for the USB keyboard. All types are listed below:
KB_SUN3 Sun Type 3 keyboard KB_SUN4 Sun Type 4 keyboard KB_ASCII ASCII terminal masquerading as keyboard KB_PC Type 101 PC keyboard KB_USB USB keyboardThe USB keyboard type is KB_USB; usbkbm will return KB_USB in response to the KIOCTYPE ioctl.
The argument is a pointer to an int. The layout code specified by the bCountryCode value returned in the HID descriptor is returned in the int pointed to by the argument. The countrycodes are defined in 6.2.1 of the HID 1.0 specifications.
The kb(7M) indicates that inappropriate commands for particular keyboards are ignored. Because clicking is not supported on the USB keyboard, usbkbm ignores this command
Set keyboard LEDs. Same as kb(7M).
The country codes defined in 6.2.1 of the HID 1.0 specification are returned.
This command is supported although the USB keyboard does not have a buzzer. The request for the bell is rerouted.
There is no notion of resetting the keyboard as there is for the type4 keyboard. usbkbm ignores this command and does not return an error.
See attributes(5) for a description of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
STREAMS Programming Guide
System Administration Guide: Basic Administration