.\"
.\" Copyright (c) 1997 Colin Wood              
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"      This product includes software developed by Colin Wood
.\"      for the NetBSD Project.              
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	$NetBSD: adb.4,v 1.2 1999/03/16 01:19:21 garbled Exp $
.\"
.Dd July 17, 1997
.Os
.Dt ADB 4 mac68k
.Sh NAME
.Nm adb
.Nd Apple Desktop Bus event interface
.Sh SYNOPSIS
.Cd "adb0 at obio?"
.Cd "options MRG_ADB"
.Cd "#include <machine/adbsys.h>"
.Sh DESCRIPTION
The Apple Desktop Bus
.Pq Tn ADB
is the single-master, multiple-slave, low-speed serial bus
interface used by Macintosh computers to connect input devices
such as keyboards, mice, trackballs, and graphics tablets
to the machine.
.Pp
The
.Nm
device is the sole interface to user input.
It combines both keyboard and mouse drivers into one event driver.
All user input is obtained by doing a
.Xr read 2
on the
.Nm
device.
Since most Macintosh mice have only one button, the
.Nm
driver will emulate a second and third mouse button with
the keyboard.
The
.Nm
device only supports being opened by one process at a time.
.Pp
There are two interfaces to the
.Tn ADB
hardware supported by the
.Nm
driver.
The older of the two relies on information in the Macintosh
.Tn ROM
to interface with the hardware.
This method is only available if the
.Dv MRG_ADB
option is defined in the kernel configuration file.
The newer method interfaces directly with the
.Tn VIA
hardware and with the Power Manager hardware if it is
present
.Pq i.e. on the PowerBooks .
The default configuration currently uses the
Macintosh
.Tn ROM
Glue
.Pq Tn MRG
method.
.Pp
The
.Xr ioctl 2
call is used to control the
.Tn ADB
event device.
The following is a list of available 
.Xr ioctl
commands:
.Bl -tag -width ADBIOC_GETREPEAT
.It Dv ADBIOC_DEVSINFO
Get
.Tn ADB
Device Info
.Pp
The
.Nm 
event device will return an array of information containing an entry
for each device connected to the bus.  Each entry contains the
current address, default address, and handler ID for the corresponding
.Tn ADB
device.
.It Dv ADBIOC_GETREPEAT
Get Keyboard Repeat Info
.Pp
Returns a structure containing the current keyboard repeat delay
and keyboard repeat interval.
.It Dv ADBIOC_SETREPEAT
Set Keyboard Repeat Rate
.Pp
Sets the keyboard repeat delay and interval to the values specified
by
.Ar argp .
.It Dv ADBIOC_RESET
.Tn ADB
Reset
.Pp
Perform a reset of the
.Tn ADB
which will reinitialize all of the devices attached to the bus.
.It Dv ADBIOC_LISTENCMD
ADB Listen Command
.Pp
Send data to the register of the
.Tn ADB
device specified by
.Ar argp .
This command is not fully implemented at this time.
.El
.Sh HARDWARE
The
.Nm
device supports the ADB hardware of most m68k-based
Macintosh models,
including the II-series, Centris- and Quadra-series, PowerBook-
and Duo-series, LC-series, and Performa-series models.
.Pp
Most standard
.Tn ADB
devices are supported by the
.Nm
driver, including mice which follow Apple's
Extended Mouse Protocol.
Many multi-button mice which follow a proprietary protocol are
not currently supported in multi-button mode.
The following is a partial list of supported
.Tn ADB
devices:
.Bd -filled -offset indent
.Bl -item -compact
.It
Apple Standard Keyboard
.It
Apple Extended Keyboard
.It
Apple Adjustable Keyboard
.It
Apple Desktop Bus Mouse
.It
Logitech TrackMan
.It
Logitech MouseMan
.It
Microspeed Mouse Deluxe
.It
Mouse Systems A3 Mouse
.El
.Ed
.Sh DIAGNOSTICS
.Bl -diag -compact
.It adb0 at obio0 (ADB event device).
This is a normal autoconfiguration message noting the presence of the
.Nm
event device.
.It adb: bus subsystem.
A standard autoconfiguration message indicating the initialization
of the
.Tn ADB
subsystem.
.It adb: no devices found.
No
.Tn ADB
devices were found to be connected to the bus during autoconfiguration.
.It adb: using %s series hardware support.
Indicates the class of
.Tn ADB
hardware support the machine uses.
.It adb: hardware type unknown for this machine.
The
.Tn ADB
hardware in this machine is currently unsupported.
.It "adb: no ROM ADB driver in this kernel for this machine."
The kernel lacks the necessary Macintosh ROM Glue
.Pq Tn MRG
support for accessing the
.Tn ADB
hardware on this machine.
.It adb: using serial console.
A serial console will be used for user input rather than the
.Tn ADB
event device.
.It adb: %s at %d.
An
.Tn ADB
device of the type specified by
.Em %s
has been found at location
.Em %d .
.El
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENXIO
No such
.Tn ADB
event device.
.It Bq Er EBUSY
Another process has the device open.
.It Bq Er EINVAL
Invalid
.Xr ioctl
specification.
.It Bq Er EMSGSIZE
The size of the
.Tn ADB
event being read is too large to fit into the buffer
allocated to it.
.El
.Sh FILES
.Bl -tag -width /dev/adb -compact
.It Pa /dev/adb
The
.Tn ADB
event device.
.El
.Sh HISTORY
The
.Nm
interface first appeared in
.Nx 0.9 .
It has been under development ever since.
.Sh AUTHORS
Bradley A. Grantham wrote the original
.Nm
driver, including the
.Tn MRG
support.
The hardware direct interface was written by
John P. Wittkowski.
The PowerManager interface was written by Takashi Hamada.
.Sh BUGS
.Bl -bullet
.It
Not every class of
.Tn ADB
hardware is supported yet.
.It
The talk command is currently unimplemented.
.It
The listen command is not implemented yet.
.It
Not all multi-button mice are currently supported.
.It
Only mapped and relative-position
.Tn ADB
devices
.Pq i.e. keyboards and mice
are supported.
Thus absolute-position and other exotic devices will not work.
.El