331 lines
10 KiB
Groff
331 lines
10 KiB
Groff
.\" $NetBSD: pckbport.9,v 1.5 2009/03/09 19:24:32 joerg Exp $
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.\"
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.\" Copyright (c) 2004 Ben Harris
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 5, 2004
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.Dt PCKBPORT 9
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.Os
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.Sh NAME
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.Nm pckbport ,
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.Nm pckbport_attach ,
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.Nm pckbport_attach_slot ,
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.Nm pckbport_cnattach ,
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.Nm pckbportintr ,
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.Nm pckbport_set_inputhandler ,
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.Nm pckbport_flush ,
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.Nm pckbport_poll_cmd ,
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.Nm pckbport_enqueue_cmd ,
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.Nm pckbport_poll_data ,
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.Nm pckbport_set_poll ,
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.Nm pckbport_xt_translation ,
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.Nm pckbport_slot_enable
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.Nd PC keyboard port interface
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.Sh SYNOPSIS
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.In dev/pckbport/pckbportvar.h
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.Ft pckbport_tag_t
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.Fn pckbport_attach "void *" "struct pckbport_accessops const *"
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.Ft "struct device *"
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.Fn pckbport_attach_slot "struct device *" pckbport_tag_t pckbport_slot_t
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.Ft int
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.Fn pckbport_cnattach "void *" "struct pckbport_accessops const *" \
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pckbport_slot_t
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.Ft void
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.Fn pckbportintr pckbport_tag_t pckbport_slot_t int
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.Ft void
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.Fn pckbport_set_inputhandler pckbport_tag_t pckbport_slot_t \
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pckbport_inputfcn "void *" "char *"
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.Ft void
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.Fn pckbport_flush pckbport_tag_t pckbport_slot_t
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.Ft int
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.Fn pckbport_poll_cmd pckbport_tag_t pckbport_slot_t "u_char *" int int \
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"u_char *" int
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.Ft int
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.Fn pckbport_enqueue_cmd pckbport_tag_t pckbport_slot_t "u_char *" int int \
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int "u_char *"
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.Ft int
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.Fn pckbport_poll_data pckbport_tag_t pckbport_slot_t
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.Ft void
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.Fn pckbport_set_poll pckbport_tag_t pckbport_slot_t int
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.Ft int
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.Fn pckbport_xt_translation pckbport_tag_t pckbport_slot_t int
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.Ft void
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.Fn pckbport_slot_enable pckbport_tag_t pckbport_slot_t int
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.Sh DESCRIPTION
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The machine-independent
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.Nm
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subsystem provides an interface layer corresponding to the serial
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keyboard and mouse interface used on the
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.Tn IBM PS/2
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and many other machines.
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It interfaces a controller driver such as
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.Xr pckbc 4
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to device drivers such as
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.Xr pckbd 4
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and
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.Xr pms 4 .
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.Pp
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A single controller can have up to two ports (known as
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.Dq slots ) ,
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and these are identified by values of type
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.Fa pckbport_slot_t .
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The values
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.Dv PCKBPORT_KBD_SLOT
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and
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.Dv PCKBPORT_AUX_SLOT
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should be used for keyboard and mouse ports respectively.
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Each controller is identified by an opaque value of type
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.Fa pckbport_tag_t .
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.Ss Controller interface
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A PC keyboard controller registers itself by calling
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.Fn pckbport_attach cookie ops ,
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with
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.Fa ops
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being a pointer to a
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.Fa struct pckbport_accessops
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containing pointers to functions for driving the controller, which will
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all be called with
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.Fa cookie
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as their first argument.
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.Fn pckbport_attach
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returns the
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.Fa pckbport_tag_t
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assigned to the controller.
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The controller is then expected to call
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.Fn pckbport_attach_slot
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for each slot with which it is equipped, passing the
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.Fa "struct device *"
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corresponding to the controller.
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This function returns a pointer to the child device attached to the slot,
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or
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.Dv NULL
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if no such device was attached.
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.Pp
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The elements of
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.Fa "struct pckbport_accessops"
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each take as their first two arguments the
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.Fa cookie
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passed to
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.Fn pckbport_attach
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and the slot in question.
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The elements are:
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.Bl -tag -width Fn
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.It Fa int Fn (*t_xt_translation) "void *cookie" "pckbport_slot_t slot" \
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"int on"
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If
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.Fa on
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is non-zero, enable, otherwise disable, AT-to-XT keycode translation
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on the slot specified.
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Returns 1 on success, 0 on failure (or if the controller does not support such
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translation).
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.It Fa int Fn (*t_send_devcmd) "void *cookie" "pckbport_slot_t slot" \
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"u_char byte"
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Send a single
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.Fa byte
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to the device without waiting for completion.
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Returns 1 on success, 0 on failure.
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.It Fa int Fn (*t_poll_data1) "void *cookie" "pckbport_slot_t slot"
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Wait for and return one byte of data from the device, without using interrupts.
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This function will only be called after
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.Fn "(*t_set_poll)"
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has been used to put the slot in polling mode.
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If no data are forthcoming from the device after about 100ms, return \-1.
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.It Fa void Fn (*t_slot_enable) "void *cookie" "pckbport_slot_t slot" "int on"
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If
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.Fa on
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is non-zero, enable, otherwise disable, the slot.
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If a slot is disabled, it can be powered down, and is not expected to
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generate any interrupts.
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When first attached, ports should be disabled.
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.It Fa void Fn (*t_intr_establish) "void *cookie" "pckbport_slot_t slot"
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Set up an interrupt handler for the slot.
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Called when a device gets attached to it.
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.It Fa void Fn (*t_set_poll) "void *cookie" "pckbport_slot_t slot" "int on"
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If
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.Fa on
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is non-zero, enable, otherwise disable, polling mode on the slot.
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In polling mode, data received from the device are provided to
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.Fn (*t_poll_data1)
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and not passed to
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.Fn pckbportintr ,
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whether or not interrupts are enabled.
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In non-polling mode,
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data from the device are expected to cause interrupts.
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The controller interrupt handler should call
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.Fn pckbportintr tag slot byte
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once for each
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.Va byte
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received from the device.
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When first attached, a port should be in non-polling mode.
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.El
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.Ss Device interface
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Devices that attach to
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.Nm
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controllers do so using the normal
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.Xr autoconf 9
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mechanism.
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Their
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.Fn (*ca_match)
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and
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.Fn (*ca_attach)
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functions get passed a
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.Fa "struct pckbport_attach_args"
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which contains the controller and slot number where the device was found.
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Device drivers can use the following functions to communicate with the
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controller.
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Each takes
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.Fa tag
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and
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.Fa slot
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arguments to specify the slot to be acted on.
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.Bl -tag -width Fn
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.It Fn pckbport_set_inputhandler tag slot fn arg name
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Arrange for
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.Fa fn
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to be called with argument
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.Fa arg
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whenever an unsolicited byte is received from the slot.
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The function will be called at
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.Fn spltty .
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.It Fn pckbport_flush tag slot
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Ensure that there is no pending input from the slot.
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.It Fn pckbport_poll_cmd tag slot cmd len responselen respbuf slow
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Issue a complete device command,
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.Fa cmd ,
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.Fa len
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bytes long, expecting a response
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.Fa responselen
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bytes long, which will be placed in
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.Fa respbuf .
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If
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.Fa slow
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is true, the command is expected to take over a second to execute.
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.Fn pckbport_poll_cmd
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handles getting an acknowledgement from the device and retrying the command
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if necessary.
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Returns 0 on success, and an error value on failure.
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This function should only be called during autoconfiguration or when the
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slot has been placed into polling mode by
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.Fn pckbport_set_poll .
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.It Fn pckbport_enqueue_cmd tag slot cmd len responselen sync respbuf
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Issue a complete device command,
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.Fa cmd ,
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.Fa len
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bytes long, expecting a response
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.Fa responselen
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bytes long, which will be places in
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.Fa respbuf .
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If
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.Fa sync
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is true,
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.Fn pckbport_enqueue_cmd
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waits for the command to complete before returning, otherwise it returns
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immediately.
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It is not safe to set
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.Fa sync
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when calling from an interrupt context.
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The
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.Nm pckbport
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layer handles getting an acknowledgement from the device and retrying
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the command if necessary.
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Returns 0 on success, and an error value on failure.
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.It Fn pckbport_poll_data tag slot
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Low-level command to poll for a single byte of data from the device, but
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ignoring bytes that are part of the response to a command issued through
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.Fn pckbport_enqueue_command .
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.It Fn pckbport_set_poll tag slot on
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If
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.Fa on
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is true, enable polling on the slot, otherwise disable it.
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In polling mode,
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.Fn pckbport_poll_cmd
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can be used to issue commands and
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.Fn pckbport_poll_data
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to read unsolicited data, without enabling interrupts.
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In non-polling mode, commands should be issued using
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.Fn pckbport_enqueue_cmd ,
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unsolicited data are handled by the input function, and disabling interrupts
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will suspend
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.Nm
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operation.
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.It Fn pckbport_xt_translation tag slot on
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Passthrough of
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.Fn (*t_xt_translation)
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(see above).
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.It Fn pckbport_slot enable tag slot on
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Passthrough of
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.Fn (*t_slot_enable)
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(see above).
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.El
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.Ss Console interface
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On systems that can attach consoles through
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.Nm ,
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the controller's console attachment function (called very early in
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autoconfiguration) calls
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.Fn pckbport_cnattach cookie ops slot .
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The first two arguments are the same as for
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.Fn pckbport_attach ,
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while the third indicates which slot the console keyboard is attached to.
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.Fn pckbport_cnattach
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either calls
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.Fn pckbd_cnattach ,
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if it is available, or
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.Fn pckbport_machdep_cnattach .
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The latter allows machine-dependent keyboard drivers to attach themselves,
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but it is only called if a device with the
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.Ql pckbport_machdep_cnattach
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attribute is configured into the system.
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.Fn pckbport_cnattach
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returns 0 on success and an error value on failure.
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.Fn pckbport_machdep_cnattach
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is expected to do the same.
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.Sh CODE REFERENCES
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The
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.Nm
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code, and the
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.Xr pckbd 4
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and
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.Xr pms 4
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device drivers are in
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.Pa sys/dev/pckbport .
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.Sh SEE ALSO
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.Xr pckbc 4 ,
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.Xr pckbd 4 ,
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.Xr pms 4 ,
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.Xr autoconf 9 ,
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.Xr spl 9
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.Sh HISTORY
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The
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.Nm
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system appeared in
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.Nx 2.0 .
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Before that,
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.Xr pckbd 4
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and
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.Xr pms 4
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attached directly to
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.Xr pckbc 4
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without any sensible way of using a different controller.
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