/* $NetBSD: acpi_wakedev.c,v 1.12.2.2 2010/04/21 00:27:33 matt Exp $ */

/*-
 * Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca>
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_wakedev.c,v 1.12.2.2 2010/04/21 00:27:33 matt Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/device.h>
#include <sys/queue.h>
#include <sys/sysctl.h>

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

struct acpi_wakedev;

static TAILQ_HEAD(, acpi_wakedev) acpi_wakedevlist =
    TAILQ_HEAD_INITIALIZER(acpi_wakedevlist);;
static int acpi_wakedev_node = -1;

struct acpi_wakedev {
	struct acpi_devnode	*aw_node;
	int			aw_enabled;
	struct sysctllog	*aw_sysctllog;
	TAILQ_ENTRY(acpi_wakedev) aw_list;
};

static const char * const acpi_wakedev_default[] = {
	"PNP0C0C",	/* power button */
	"PNP0C0E",	/* sleep button */
	"PNP0C0D",	/* lid switch */
	"PNP03??",	/* PC KBD port */
	NULL,
};

SYSCTL_SETUP(sysctl_acpi_wakedev_setup, "sysctl hw.wake subtree setup")
{
	const struct sysctlnode *rnode;
	int err;

	err = sysctl_createv(NULL, 0, NULL, NULL,
	    CTLFLAG_PERMANENT,
	    CTLTYPE_NODE, "hw", NULL,
	    NULL, 0, NULL, 0, CTL_HW, CTL_EOL);
	if (err)
		return;
	err = sysctl_createv(NULL, 0, NULL, &rnode,
	    CTLFLAG_PERMANENT,
	    CTLTYPE_NODE, "wake", NULL,
	    NULL, 0, NULL, 0,
	    CTL_HW, CTL_CREATE, CTL_EOL);
	if (err)
		return;
	acpi_wakedev_node = rnode->sysctl_num;
}

static void
acpi_wakedev_sysctl_add(struct acpi_wakedev *aw)
{
	int err;

	if (acpi_wakedev_node == -1)
		return;

	err = sysctl_createv(&aw->aw_sysctllog, 0, NULL, NULL,
	    CTLFLAG_READWRITE, CTLTYPE_INT, aw->aw_node->ad_name,
	    NULL, NULL, 0, &aw->aw_enabled, 0,
	    CTL_HW, acpi_wakedev_node, CTL_CREATE, CTL_EOL);
	if (err)
		printf("acpi_wakedev_sysctl_add: "
		    "sysctl_createv(hw.wake.%s) failed. (%d)\n",
		    aw->aw_node->ad_name, err);
}

static bool
acpi_wakedev_add(struct acpi_softc *sc, struct acpi_devnode *ad)
{
	struct acpi_wakedev *aw;
	ACPI_HANDLE hdl;

	if (ACPI_FAILURE(AcpiGetHandle(ad->ad_handle, "_PRW", &hdl)))
		return false;

	aw = kmem_alloc(sizeof(*aw), KM_SLEEP);
	if (aw == NULL) {
		aprint_error("acpi_wakedev_add: kmem_alloc failed\n");
		return false;
	}
	aw->aw_node = ad;
	aw->aw_sysctllog = NULL;
	if (acpi_match_hid(ad->ad_devinfo, acpi_wakedev_default))
		aw->aw_enabled = 1;
	else
		aw->aw_enabled = 0;

	TAILQ_INSERT_TAIL(&acpi_wakedevlist, aw, aw_list);

	acpi_wakedev_sysctl_add(aw);

	return true;
}

static void
acpi_wakedev_print(struct acpi_wakedev *aw)
{
	aprint_debug(" %s", aw->aw_node->ad_name);
}

int
acpi_wakedev_scan(struct acpi_softc *sc)
{
	struct acpi_scope *as;
	struct acpi_devnode *ad;
	struct acpi_wakedev *aw;
	ACPI_DEVICE_INFO *di;
	int count = 0;

#define ACPI_STA_DEV_VALID	\
	(ACPI_STA_DEV_PRESENT|ACPI_STA_DEV_ENABLED|ACPI_STA_DEV_OK)

	TAILQ_FOREACH(as, &sc->sc_scopes, as_list)
		TAILQ_FOREACH(ad, &as->as_devnodes, ad_list) {
			di = ad->ad_devinfo;
			if (di->Type != ACPI_TYPE_DEVICE)
				continue;
			if ((di->Valid & ACPI_VALID_STA) != 0 &&
			    (di->CurrentStatus & ACPI_STA_DEV_VALID) !=
			     ACPI_STA_DEV_VALID)
				continue;
			if (acpi_wakedev_add(sc, ad) == true)
				++count;
		}

#undef ACPI_STA_DEV_VALID

	if (count == 0)
		return 0;

	aprint_debug_dev(sc->sc_dev, "wakeup devices:");
	TAILQ_FOREACH(aw, &acpi_wakedevlist, aw_list)
		acpi_wakedev_print(aw);
	aprint_debug("\n");

	return count;
}

void
acpi_wakedev_commit(struct acpi_softc *sc)
{
	struct acpi_wakedev *aw;

	TAILQ_FOREACH(aw, &acpi_wakedevlist, aw_list) {
		if (aw->aw_enabled) {
			aprint_debug_dev(sc->sc_dev, "set wake GPE (%s)\n",
			    aw->aw_node->ad_name);
			acpi_set_wake_gpe(aw->aw_node->ad_handle);
		} else
			acpi_clear_wake_gpe(aw->aw_node->ad_handle);
	}
}