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231 lines
6.2 KiB
C
231 lines
6.2 KiB
C
/*-
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* Copyright (c) 2008 Yahoo!, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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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. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 2004 Benjamin Close <Benjamin.Close@clearchain.com>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Support for managing the display via DPMS for suspend/resume.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/module.h>
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#include <compat/x86bios/x86bios.h>
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/*
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* VESA DPMS States
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*/
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#define DPMS_ON 0x00
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#define DPMS_STANDBY 0x01
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#define DPMS_SUSPEND 0x02
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#define DPMS_OFF 0x04
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#define DPMS_REDUCEDON 0x08
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#define VBE_DPMS_FUNCTION 0x4F10
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#define VBE_DPMS_GET_SUPPORTED_STATES 0x00
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#define VBE_DPMS_GET_STATE 0x02
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#define VBE_DPMS_SET_STATE 0x01
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#define VBE_MAJORVERSION_MASK 0x0F
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#define VBE_MINORVERSION_MASK 0xF0
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struct dpms_softc {
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int dpms_supported_states;
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int dpms_initial_state;
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};
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static int dpms_attach(device_t);
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static int dpms_detach(device_t);
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static int dpms_get_supported_states(int *);
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static int dpms_get_current_state(int *);
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static void dpms_identify(driver_t *, device_t);
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static int dpms_probe(device_t);
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static int dpms_resume(device_t);
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static int dpms_set_state(int);
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static int dpms_suspend(device_t);
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static device_method_t dpms_methods[] = {
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DEVMETHOD(device_identify, dpms_identify),
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DEVMETHOD(device_probe, dpms_probe),
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DEVMETHOD(device_attach, dpms_attach),
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DEVMETHOD(device_detach, dpms_detach),
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DEVMETHOD(device_suspend, dpms_suspend),
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DEVMETHOD(device_resume, dpms_resume),
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{ 0, 0 }
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};
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static driver_t dpms_driver = {
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"dpms",
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dpms_methods,
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sizeof(struct dpms_softc),
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};
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static devclass_t dpms_devclass;
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DRIVER_MODULE(dpms, vgapm, dpms_driver, dpms_devclass, NULL, NULL);
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MODULE_DEPEND(dpms, x86bios, 1, 1, 1);
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static void
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dpms_identify(driver_t *driver, device_t parent)
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{
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if (x86bios_match_device(0xc0000, device_get_parent(parent)))
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device_add_child(parent, "dpms", 0);
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}
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static int
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dpms_probe(device_t dev)
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{
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int error, states;
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error = dpms_get_supported_states(&states);
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if (error)
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return (error);
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device_set_desc(dev, "DPMS suspend/resume");
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device_quiet(dev);
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return (BUS_PROBE_DEFAULT);
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}
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static int
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dpms_attach(device_t dev)
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{
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struct dpms_softc *sc;
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int error;
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sc = device_get_softc(dev);
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error = dpms_get_supported_states(&sc->dpms_supported_states);
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if (error)
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return (error);
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error = dpms_get_current_state(&sc->dpms_initial_state);
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return (error);
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}
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static int
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dpms_detach(device_t dev)
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{
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return (0);
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}
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static int
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dpms_suspend(device_t dev)
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{
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struct dpms_softc *sc;
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sc = device_get_softc(dev);
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if ((sc->dpms_supported_states & DPMS_OFF) != 0)
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dpms_set_state(DPMS_OFF);
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return (0);
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}
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static int
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dpms_resume(device_t dev)
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{
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struct dpms_softc *sc;
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sc = device_get_softc(dev);
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dpms_set_state(sc->dpms_initial_state);
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return (0);
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}
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static int
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dpms_call_bios(int subfunction, int *bh)
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{
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x86regs_t regs;
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if (x86bios_get_intr(0x10) == 0)
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return (ENXIO);
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x86bios_init_regs(®s);
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regs.R_AX = VBE_DPMS_FUNCTION;
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regs.R_BL = subfunction;
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regs.R_BH = *bh;
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x86bios_intr(®s, 0x10);
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if (regs.R_AX != 0x004f)
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return (ENXIO);
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*bh = regs.R_BH;
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return (0);
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}
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static int
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dpms_get_supported_states(int *states)
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{
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*states = 0;
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return (dpms_call_bios(VBE_DPMS_GET_SUPPORTED_STATES, states));
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}
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static int
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dpms_get_current_state(int *state)
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{
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*state = 0;
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return (dpms_call_bios(VBE_DPMS_GET_STATE, state));
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}
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static int
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dpms_set_state(int state)
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{
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return (dpms_call_bios(VBE_DPMS_SET_STATE, &state));
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}
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