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dpms.c
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Editing: dpms.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * 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 <compat/x86bios/x86bios.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, vgapm, dpms_driver, dpms_devclass, NULL, NULL); MODULE_DEPEND(dpms, x86bios, 1, 1, 1); static void dpms_identify(driver_t *driver, device_t parent) { if (x86bios_match_device(0xc0000, device_get_parent(parent))) 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) { struct dpms_softc *sc; sc = device_get_softc(dev); if ((sc->dpms_supported_states & DPMS_OFF) != 0) 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) { x86regs_t regs; if (x86bios_get_intr(0x10) == 0) return (ENXIO); x86bios_init_regs(®s); regs.R_AX = VBE_DPMS_FUNCTION; regs.R_BL = subfunction; regs.R_BH = *bh; x86bios_intr(®s, 0x10); if (regs.R_AX != 0x004f) return (ENXIO); *bh = regs.R_BH; return (0); } 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)); }
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