freebsd/sys/dev/acpica/acpi_lid.c

/*-
 * Copyright (c) 2000 Takanori Watanabe <takawata@jp.freebsd.org>
 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
 * Copyright (c) 2000 Michael Smith <msmith@freebd.org>
 * Copyright (c) 2000 BSDi
 * 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.
 *
 *	$FreeBSD$
 */

#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>

#include "acpi.h"

#include <dev/acpica/acpivar.h>

struct acpi_lid_softc {
    device_t	lid_dev;
    ACPI_HANDLE	lid_handle;
    int		lid_status;	/* open or closed */
};

static int	acpi_lid_probe(device_t dev);
static int	acpi_lid_attach(device_t dev);
static void	acpi_lid_notify_status_changed(void *arg);
static void 	acpi_lid_notify_handler(ACPI_HANDLE h,UINT32 notify, void *context);

static device_method_t acpi_lid_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,	acpi_lid_probe),
    DEVMETHOD(device_attach,	acpi_lid_attach),

    {0, 0}
};

static driver_t acpi_lid_driver = {
    "acpi_lid",
    acpi_lid_methods,
    sizeof(struct acpi_lid_softc),
};

devclass_t acpi_lid_devclass;
DRIVER_MODULE(acpi_lid, acpi, acpi_lid_driver, acpi_lid_devclass, 0, 0);

static int
acpi_lid_probe(device_t dev)
{
    if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && 
	acpi_MatchHid(dev, "PNP0C0D")) {
	device_set_desc(dev, "Control Method Lid Switch");
	return(0);
    }
    return(ENXIO);
}

static int
acpi_lid_attach(device_t dev)
{
    struct acpi_lid_softc	*sc;

    sc = device_get_softc(dev);
    sc->lid_dev = dev;
    sc->lid_handle = acpi_get_handle(dev);

    /*
     * Install notification handler
     */
    AcpiInstallNotifyHandler(sc->lid_handle, ACPI_DEVICE_NOTIFY, acpi_lid_notify_handler, sc);
    return(0);
}

static void
acpi_lid_notify_status_changed(void *arg)
{
    struct acpi_lid_softc	*sc;
    struct acpi_softc		*acpi_sc;
    ACPI_BUFFER			Buffer;
    ACPI_OBJECT			Object;

    sc = (struct acpi_lid_softc *)arg;

    /*
     * Evaluate _LID and check the return value
     *	Zero:		The lid is closed
     *	Non-zero:	The lid is open
     */
    Buffer.Length = sizeof(Object);
    Buffer.Pointer = &Object;
    if (AcpiEvaluateObject(sc->lid_handle, "_LID", NULL, &Buffer) != AE_OK)
	return;
    if (Object.Type != ACPI_TYPE_NUMBER) 
	return;

    /*
     * Update lid status
    */
    sc->lid_status = Object.Number.Value;
    device_printf(sc->lid_dev, "Lid %s\n", sc->lid_status ? "opened" : "closed");

    acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
    if (acpi_sc == NULL) {
        return;
    }

    if (sc->lid_status == 0) {
	EVENTHANDLER_INVOKE(acpi_sleep_event, acpi_sc->acpi_lid_switch_sx);
    } else {
	EVENTHANDLER_INVOKE(acpi_wakeup_event, acpi_sc->acpi_lid_switch_sx);
    }
}

/* XXX maybe not here */
#define	ACPI_NOTIFY_STATUS_CHANGED	0x80

static void 
acpi_lid_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
{
    struct acpi_lid_softc	*sc = (struct acpi_lid_softc *)context;

    switch (notify) {
    case ACPI_NOTIFY_STATUS_CHANGED:
	AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_lid_notify_status_changed, sc);
	break;
    default:
	return;		/* unknown notification value */
    }
}