hilkbd(7) hilkbd(7)
NAME [Toc] [Back]
hilkbd - HP-HIL mapped keyboard driver
DESCRIPTION [Toc] [Back]
HP-HIL, the Hewlett-Packard Human Interface Link, is the HewlettPackard
standard for interfacing a personal computer, terminal, or
workstation to its input devices. hilkbd supplies input from all
mapped keyboards on a specified HP-HIL link.
hilkbd returns mapped keycodes, not ASCII characters. ``Raw''
keycodes are the individual key downstrokes and upstrokes, and are
different for each type of keyboard. hilkbd maps the raw input into
the keycodes and protocol expected by the HP-UX, Pascal Workstation,
and BASIC/UX operating systems. The hil(7) driver can usurp a
keyboard from hilkbd by changing it from mapped mode to raw mode.
System Calls [Toc] [Back]
open(2) gives exclusive access to the keyboard. If there is an ITE
(internal terminal emulator) associated with the keyboard, the ITE
loses input from the keyboard until the keyboard device is closed.
Any previous queued input for the keyboard device is flushed from the
input queue.
close(2) returns control of the keyboard to the ITE, if present. Any
unread input is discarded at that time.
read(2) returns data from the keyboard in time-stamped packets:
unsigned char time_stamp[4];
unsigned char status;
unsigned char data;
time_stamp, when repacked into an integer data type of four or more
bytes, specifies the time since an arbitrary point in the past (e.g.,
system start-up time). This point does not change between packets,
but time during a power failure may or may not be counted. The time
is in units of tens of milliseconds.
The status byte encodes the state of the keyboard Shift and Ctrl keys:
0x8X shift and control
0x9X control only
0xAX shift only
0xBX no shift or control
The data byte contains the actual keystroke.
If the file status flag O_NDELAY is set, read(2) returns 0 instead of
blocking, when no data is available. The read(2) system call on an
HP-HIL keyboard is considered "slow"; that is, it can be interrupted
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hilkbd(7) hilkbd(7)
by caught signals (see signal(2)).
write(2) is not supported by hilkbd.
select(2) can be used to poll for input to read from hilkbd devices.
select(2) for write or for exceptional conditions always returns a
false indication in the bit masks.
ioctl(2) is used to perform special operations on the device.
ioctl(2) system calls have the form:
int ioctl(int fildes, int request, char *arg);
The following hilkbd request codes are defined in <sys/hilioctl.h>:
KBD_READ_CONFIG
Read the configuration code.
This request returns a one-byte configuration code in
the char variable to which arg points. This contains a
field, defined by KBD_IDCODE_MASK, which specifies the
keyboard identification code. The possible values of
this field are defined in the header file, and this
identification code affects interpretation of the
language code. All other fields in the configuration
code are currently undefined.
KBD_READ_LANGUAGE
Read the language code.
This request returns a one-byte language code, as read
from the keyboard, in the char variable to which arg
points. If there is more than one keyboard, the
language is taken from the first keyboard on the link.
Interpretation of the language code is affected by the
keyboard identification field within the configuration
code.
KBD_STATUS Read the keyboard status register.
This request returns a one-byte value containing bit
flags specifying the state of the shift and control
keys in the char variable to which arg points:
KBD_STAT_LEFTSHIFT The left shift key is up
KBD_STAT_RIGHTSHIFT The right shift key is up
KBD_STAT_SHIFT Both shift keys are up
KBD_STAT_CTRL The control key is up
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hilkbd(7) hilkbd(7)
Other bits are undefined.
KBD_REPEAT_RATE
Set the keyboard auto-repeat rate.
The one-byte value to which arg points is the negative
of the repeat period, in tens of milliseconds. The
repeat rate is the reciprocal of the repeat period. A
parameter of zero disables auto-repeat.
KBD_REPEAT_DELAY
Set the keyboard auto-repeat delay.
The one-byte value to which arg points is the negative
of the repeat delay, in tens of milliseconds.
KBD_BEEP Cause an audible beep.
The one-byte value to which arg points specifies the
volume of the beep, within the range 0 through
KBD_MAXVOLUME. Implementations with fewer than
KBD_MAXVOLUME discrete levels of volume will scale the
parameter into the smaller range.
ERRORS [Toc] [Back]
[EINVAL] An invalid parameter was detected by ioctl(2).
[EINTR] A signal was caught during a read(2) system call.
[ENXIO] No keyboard is present on the HP-HIL link specified by
the minor number.
[ENODEV] An attempt was made to use write(2) using hilkbd.
[EBUSY] The device is already open.
AUTHOR [Toc] [Back]
hilkbd was developed by the Hewlett-Packard Company.
FILES [Toc] [Back]
/dev/hilkbd*
SEE ALSO [Toc] [Back]
termio(7), hil(7), mknod(1M), select(2), signal(2).
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