/*	$NetBSD: acpi_button.c,v 1.25 2007/12/09 20:27:52 jmcneill Exp $	*/

/*
 * Copyright 2001, 2003 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed for the NetBSD Project by
 *	Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * ACPI Button driver.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_button.c,v 1.25 2007/12/09 20:27:52 jmcneill Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <dev/acpi/acpica.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>

#include <dev/sysmon/sysmonvar.h>

struct acpibut_softc {
	struct acpi_devnode *sc_node;	/* our ACPI devnode */
	struct sysmon_pswitch sc_smpsw;	/* our sysmon glue */
	int sc_flags;			/* see below */
};

static const char * const power_button_hid[] = {
	"PNP0C0C",
	NULL
};

static const char * const sleep_button_hid[] = {
	"PNP0C0E",
	NULL
};

#define	ACPIBUT_F_VERBOSE		0x01	/* verbose events */

static int	acpibut_match(device_t, struct cfdata *, void *);
static void	acpibut_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(acpibut, sizeof(struct acpibut_softc),
    acpibut_match, acpibut_attach, NULL, NULL);

static void	acpibut_pressed_event(void *);
static void	acpibut_notify_handler(ACPI_HANDLE, UINT32, void *);

/*
 * acpibut_match:
 *
 *	Autoconfiguration `match' routine.
 */
static int
acpibut_match(device_t parent, struct cfdata *match, void *aux)
{
	struct acpi_attach_args *aa = aux;

	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
		return 0;

	if (acpi_match_hid(aa->aa_node->ad_devinfo, power_button_hid))
		return 1;

	if (acpi_match_hid(aa->aa_node->ad_devinfo, sleep_button_hid))
		return 1;

	return 0;
}

/*
 * acpibut_attach:
 *
 *	Autoconfiguration `attach' routine.
 */
static void
acpibut_attach(device_t parent, device_t self, void *aux)
{
	struct acpibut_softc *sc = device_private(self);
	struct acpi_attach_args *aa = aux;
	const char *desc;
	ACPI_STATUS rv;

	sc->sc_smpsw.smpsw_name = device_xname(self);

	if (acpi_match_hid(aa->aa_node->ad_devinfo, power_button_hid)) {
		sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_POWER;
		desc = "Power";
	} else if (acpi_match_hid(aa->aa_node->ad_devinfo, sleep_button_hid)) {
		sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_SLEEP;
		desc = "Sleep";
	} else {
		panic("acpibut_attach: impossible");
	}

	aprint_naive(": ACPI %s Button\n", desc);
	aprint_normal(": ACPI %s Button\n", desc);

	sc->sc_node = aa->aa_node;

	if (sysmon_pswitch_register(&sc->sc_smpsw) != 0) {
		aprint_error_dev(self, "unable to register with sysmon\n");
		return;
	}

	rv = AcpiInstallNotifyHandler(sc->sc_node->ad_handle,
	    ACPI_DEVICE_NOTIFY, acpibut_notify_handler, self);
	if (ACPI_FAILURE(rv)) {
		aprint_error_dev(self,
		    "unable to register DEVICE NOTIFY handler: %s\n",
		    AcpiFormatException(rv));
		return;
	}

	acpi_set_wake_gpe(sc->sc_node->ad_handle);

#ifdef ACPI_BUT_DEBUG
	/* Display the current state when it changes. */
	sc->sc_flags = ACPIBUT_F_VERBOSE;
#endif

	if (!pmf_device_register(self, NULL, NULL))
		aprint_error_dev(self, "couldn't establish power handler\n");
}

/*
 * acpibut_pressed_event:
 *
 *	Deal with a button being pressed.
 */
static void
acpibut_pressed_event(void *arg)
{
	device_t dv = arg;
	struct acpibut_softc *sc = device_private(dv);

	if (sc->sc_flags & ACPIBUT_F_VERBOSE)
		aprint_verbose_dev(dv, "button pressed\n");

	sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
}

/*
 * acpibut_notify_handler:
 *
 *	Callback from ACPI interrupt handler to notify us of an event.
 */
static void
acpibut_notify_handler(ACPI_HANDLE handle, UINT32 notify, void *context)
{
	device_t dv = context;
	int rv;

	switch (notify) {
	case ACPI_NOTIFY_S0PowerButtonPressed:
#if 0
	case ACPI_NOTIFY_S0SleepButtonPressed: /* same as above */
#endif
#ifdef ACPI_BUT_DEBUG
		aprint_debug_dev(dv, "received ButtonPressed message\n");
#endif
		rv = AcpiOsExecute(OSL_NOTIFY_HANDLER,
		    acpibut_pressed_event, dv);
		if (ACPI_FAILURE(rv))
			aprint_error_dev(dv,
			    "WARNING: unable to queue button pressed callback: %s\n",
			    AcpiFormatException(rv));
		break;

	/* XXX ACPI_NOTIFY_DeviceWake?? */

	default:
		aprint_error_dev(dv, "received unknown notify message: 0x%x\n",
		    notify);
	}
}