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Add a very simple dpms(4) driver that uses the VESA BIOS DPMS calls to

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turn off the external display during suspend and restore it to its
original state on resume.

MFC after:	2 weeks
This commit is contained in:
John Baldwin 2008-08-23 21:00:40 +00:00
parent a2a2d95441
commit aa7c1c059f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=182081
7 changed files with 303 additions and 0 deletions
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1
share/man/man4/man4.i386/Makefile
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@ -11,6 +11,7 @@ MAN= aic.4 \
cs.4 \
ct.4 \
ctau.4 \
dpms.4 \
cx.4 \
ep.4 \
ex.4 \

58
share/man/man4/man4.i386/dpms.4 Normal file
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@ -0,0 +1,58 @@
.\" Copyright (c) 2008 Yahoo!, Inc.
.\" All rights reserved.
.\" Written by: John Baldwin <jhb@FreeBSD.org>
.\"
.\" 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. Neither the name of the author nor the names of any co-contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
.\"
.\" $FreeBSD$
.\"
.Dd August 23, 2008
.Dt DPMS 4
.Os
.Sh NAME
.Nm dpms
.Nd VESA BIOS DPMS driver
.Sh SYNOPSIS
.Cd "device dpms"
.Sh DESCRIPTION
The
.Nm
driver uses the VESA BIOS to manage an external display during suspend and
resume.
When the machine suspends,
the
.Nm
driver turns the external display off.
When the machine resumes,
it restores the display to its state when the driver was first loaded.
.Sh SEE ALSO
.Xr acpi_video 4
.Sh BUGS
.Pp
The VESA BIOS DPMS calls do not provide any way to identify a particular
display or adapter to manipulate.
As a result,
this driver may have unexpected results on systems with multiple displays
and/or adapters.

1
sys/conf/files.i386
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@ -329,6 +329,7 @@ i386/isa/atpic.c optional atpic
#i386/isa/atpic_vector.s standard
i386/isa/clock.c optional native
i386/xen/clock.c optional xen
i386/isa/dpms.c optional dpms
i386/isa/elcr.c standard
i386/isa/elink.c optional ep | ie
i386/isa/isa.c optional isa

2
sys/i386/conf/NOTES
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@ -357,6 +357,8 @@ options VESA
# Turn on extra debugging checks and output for VESA support.
options VESA_DEBUG
device dpms # DPMS suspend & resume via VESA BIOS
#
# The Numeric Processing eXtension driver. This is non-optional.
device npx

230
sys/i386/isa/dpms.c Normal file
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@ -0,0 +1,230 @@
/*-
* Copyright (c) 2008 Yahoo!, Inc.
* All rights reserved.
* Written by: John Baldwin <jhb@FreeBSD.org>
*
* 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. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*
* Copyright (c) 2004 Benjamin Close <Benjamin.Close@clearchain.com>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*
* Support for managing the display via DPMS for suspend/resume.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/module.h>
#include <machine/vm86.h>
/*
* VESA DPMS States
*/
#define DPMS_ON 0x00
#define DPMS_STANDBY 0x01
#define DPMS_SUSPEND 0x02
#define DPMS_OFF 0x04
#define DPMS_REDUCEDON 0x08
#define VBE_DPMS_FUNCTION 0x4F10
#define VBE_DPMS_GET_SUPPORTED_STATES 0x00
#define VBE_DPMS_GET_STATE 0x02
#define VBE_DPMS_SET_STATE 0x01
#define VBE_MAJORVERSION_MASK 0x0F
#define VBE_MINORVERSION_MASK 0xF0
struct dpms_softc {
int dpms_supported_states;
int dpms_initial_state;
};
static int dpms_attach(device_t);
static int dpms_detach(device_t);
static int dpms_get_supported_states(int *);
static int dpms_get_current_state(int *);
static void dpms_identify(driver_t *, device_t);
static int dpms_probe(device_t);
static int dpms_resume(device_t);
static int dpms_set_state(int);
static int dpms_suspend(device_t);
static device_method_t dpms_methods[] = {
DEVMETHOD(device_identify, dpms_identify),
DEVMETHOD(device_probe, dpms_probe),
DEVMETHOD(device_attach, dpms_attach),
DEVMETHOD(device_detach, dpms_detach),
DEVMETHOD(device_suspend, dpms_suspend),
DEVMETHOD(device_resume, dpms_resume),
{ 0, 0 }
};
static driver_t dpms_driver = {
"dpms",
dpms_methods,
sizeof(struct dpms_softc),
};
static devclass_t dpms_devclass;
DRIVER_MODULE(dpms, vgapci, dpms_driver, dpms_devclass, NULL, NULL);
static void
dpms_identify(driver_t *driver, device_t parent)
{
/*
* XXX: The DPMS VBE only allows for manipulating a single
* monitor, but we don't know which one. Just attach to the
* first vgapci(4) device we encounter and hope it is the
* right one.
*/
if (devclass_get_device(dpms_devclass, 0) == NULL)
device_add_child(parent, "dpms", 0);
}
static int
dpms_probe(device_t dev)
{
int error, states;
error = dpms_get_supported_states(&states);
if (error)
return (error);
device_set_desc(dev, "DPMS suspend/resume");
device_quiet(dev);
return (BUS_PROBE_DEFAULT);
}
static int
dpms_attach(device_t dev)
{
struct dpms_softc *sc;
int error;
sc = device_get_softc(dev);
error = dpms_get_supported_states(&sc->dpms_supported_states);
if (error)
return (error);
error = dpms_get_current_state(&sc->dpms_initial_state);
return (error);
}
static int
dpms_detach(device_t dev)
{
return (0);
}
static int
dpms_suspend(device_t dev)
{
dpms_set_state(DPMS_OFF);
return (0);
}
static int
dpms_resume(device_t dev)
{
struct dpms_softc *sc;
sc = device_get_softc(dev);
dpms_set_state(sc->dpms_initial_state);
return (0);
}
static int
dpms_call_bios(int subfunction, int *bh)
{
struct vm86frame vmf;
int error;
bzero(&vmf, sizeof(vmf));
vmf.vmf_ax = VBE_DPMS_FUNCTION;
vmf.vmf_bl = subfunction;
vmf.vmf_bh = *bh;
vmf.vmf_es = 0;
vmf.vmf_di = 0;
error = vm86_intcall(0x10, &vmf);
if (error == 0 && (vmf.vmf_eax & 0xffff) != 0x004f)
error = ENXIO;
if (error == 0)
*bh = vmf.vmf_bh;
return (error);
}
static int
dpms_get_supported_states(int *states)
{
*states = 0;
return (dpms_call_bios(VBE_DPMS_GET_SUPPORTED_STATES, states));
}
static int
dpms_get_current_state(int *state)
{
*state = 0;
return (dpms_call_bios(VBE_DPMS_GET_STATE, state));
}
static int
dpms_set_state(int state)
{
return (dpms_call_bios(VBE_DPMS_SET_STATE, &state));
}

2
sys/modules/Makefile
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@ -72,6 +72,7 @@ SUBDIR= ${_3dfx} \
dcons \
dcons_crom \
de \
${_dpms} \
${_dpt} \
${_drm} \
${_dtrace} \
@ -377,6 +378,7 @@ _cs= cs
.if ${MK_CDDL} != "no" || defined(ALL_MODULES)
_cyclic= cyclic
.endif
_dpms= dpms
_drm= drm
.if ${MK_CDDL} != "no" || defined(ALL_MODULES)
_dtrace= dtrace

9
sys/modules/dpms/Makefile Normal file
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@ -0,0 +1,9 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../i386/isa
KMOD= dpms
SRCS= dpms.c
SRCS+= bus_if.h device_if.h
.include <bsd.kmod.mk>