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 hilkbd(7)							   hilkbd(7)

      hilkbd - HP-HIL mapped keyboard driver

      HP-HIL, the Hewlett-Packard Human Interface Link, is the Hewlett-
      Packard 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
      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

 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000

 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>:

		     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.

		     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

      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

 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000

 hilkbd(7)							   hilkbd(7)

		     Other bits are undefined.

		     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.

		     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.

      [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.

      hilkbd was developed by the Hewlett-Packard Company.


      termio(7), hil(7), mknod(1M), select(2), signal(2).

 Hewlett-Packard Company	    - 3 -   HP-UX Release 11i: November 2000