/*      $NetBSD: dalb_acpi.c,v 1.19 2021/01/29 15:49:55 thorpej Exp $   */

/*-
 * Copyright (c) 2008 Christoph Egger <cegger@netbsd.org>
 * Copyright (c) 2008 Jared D. McNeill <jmcneill@netbsd.org>
 * 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: dalb_acpi.c,v 1.19 2021/01/29 15:49:55 thorpej Exp $");

/*
 * Direct Application Launch Button:
 * http://www.microsoft.com/whdc/system/vista/DirAppLaunch.mspx
 */

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

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

#define _COMPONENT          ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME            ("dalb_acpi")

#define DALB_ID_INVALID         -1

struct acpi_dalb_softc {
        device_t sc_dev;
        struct acpi_devnode *sc_node;

        ACPI_INTEGER sc_usageid;

        /* There's one PNP0C32 ACPI device for each button.
         * Therefore, one instance is enough. */
        struct sysmon_pswitch sc_smpsw;
        bool sc_smpsw_valid;
};

static int      acpi_dalb_match(device_t, cfdata_t, void *);
static void     acpi_dalb_attach(device_t, device_t, void *);
static int      acpi_dalb_detach(device_t, int);
static void     acpi_dalb_notify_handler(ACPI_HANDLE, uint32_t, void *);
static bool     acpi_dalb_resume(device_t, const pmf_qual_t *);

static void     acpi_dalb_get_wakeup_hotkeys(void *opaque);
static void     acpi_dalb_get_runtime_hotkeys(void *opaque);

CFATTACH_DECL_NEW(acpidalb, sizeof(struct acpi_dalb_softc),
    acpi_dalb_match, acpi_dalb_attach, acpi_dalb_detach, NULL);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "PNP0C32" }, /* Direct Application Launch Button */
        DEVICE_COMPAT_EOL
};

#define DALB_SYSTEM_WAKEUP      0x02
#define DALB_SYSTEM_RUNTIME     0x80

static int
acpi_dalb_match(device_t parent, cfdata_t match, void *aux)
{
        struct acpi_attach_args *aa = aux;

        return acpi_compatible_match(aa, compat_data);
}

static void
acpi_dalb_sysmon_init(struct acpi_dalb_softc *sc)
{
        sc->sc_smpsw_valid = true;
        sc->sc_smpsw.smpsw_name = device_xname(sc->sc_dev);
        sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_HOTKEY;
        if (sysmon_pswitch_register(&sc->sc_smpsw)) {
                aprint_error_dev(sc->sc_dev,
                        "couldn't register sleep with sysmon\n");
                sc->sc_smpsw_valid = false;
        }
}


static void
acpi_dalb_init(device_t dev)
{
        struct acpi_dalb_softc *sc = device_private(dev);
        ACPI_OBJECT *obj;
        ACPI_STATUS rv;
        ACPI_BUFFER ret;

        rv = acpi_eval_struct(sc->sc_node->ad_handle, "GHID", &ret);

        if (ACPI_FAILURE(rv) || ret.Pointer == NULL) {
                aprint_error_dev(dev,
                        "couldn't enable notify handler: (%s)\n",
                        AcpiFormatException(rv));
                return;
        }

        obj = ret.Pointer;

        if (obj->Type != ACPI_TYPE_BUFFER) {
                sc->sc_usageid = DALB_ID_INVALID;
                aprint_debug_dev(dev, "invalid ACPI type: %u\n", obj->Type);
                goto out;
        }

        switch (obj->Buffer.Length) {
        case 1:
                sc->sc_usageid = *(uint8_t *)obj->Buffer.Pointer;
                break;
        case 2:
                sc->sc_usageid = le16toh(*(uint16_t *)obj->Buffer.Pointer);
                break;
        case 4:
                sc->sc_usageid = le32toh(*(uint32_t *)obj->Buffer.Pointer);
                break;
        default:
                aprint_debug_dev(dev, "unhandled ret.Length: 0x%lx\n",
                        (unsigned long)obj->Buffer.Length);
                sc->sc_usageid = DALB_ID_INVALID;
                break;
        }

out:
        ACPI_FREE(ret.Pointer);
}

static void
acpi_dalb_attach(device_t parent, device_t self, void *aux)
{
        struct acpi_dalb_softc *sc = device_private(self);
        struct acpi_attach_args *aa = aux;

        aprint_naive("\n");
        aprint_normal(": Direct Application Launch Button\n");

        sc->sc_dev = self;
        sc->sc_node = aa->aa_node;

        config_interrupts(self, acpi_dalb_init);

        (void)pmf_device_register(self, NULL, acpi_dalb_resume);
        (void)acpi_register_notify(sc->sc_node, acpi_dalb_notify_handler);

        sc->sc_smpsw_valid = false;
        acpi_dalb_sysmon_init(sc);
}

static int
acpi_dalb_detach(device_t self, int flags)
{
        struct acpi_dalb_softc *sc = device_private(self);

        pmf_device_deregister(self);
        acpi_deregister_notify(sc->sc_node);
        sysmon_pswitch_unregister(&sc->sc_smpsw);

        return 0;
}

static void
acpi_dalb_notify_handler(ACPI_HANDLE hdl, uint32_t notify, void *opaque)
{
        device_t dev = opaque;
        struct acpi_dalb_softc *sc = device_private(dev);
        ACPI_STATUS rv;

        switch (notify) {
        case DALB_SYSTEM_WAKEUP:
                rv = AcpiOsExecute(OSL_NOTIFY_HANDLER,
                        acpi_dalb_get_wakeup_hotkeys, dev);
                break;
        case DALB_SYSTEM_RUNTIME:
                rv = AcpiOsExecute(OSL_NOTIFY_HANDLER,
                        acpi_dalb_get_runtime_hotkeys, dev);
                break;

        default:
                aprint_error_dev(dev,
                        "unknown notification event 0x%x from button 0x%x\n",
                        notify, (uint32_t)sc->sc_usageid);
                return;
        }

        if (ACPI_FAILURE(rv))
                aprint_error_dev(dev, "couldn't queue hotkey handler: %s\n",
                        AcpiFormatException(rv));
}

static void
acpi_dalb_get_wakeup_hotkeys(void *opaque)
{
        device_t dev = opaque;
        struct acpi_dalb_softc *sc = device_private(dev);

        if (!sc->sc_smpsw_valid)
                return;

        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                "invoking %s (wakeup)\n", sc->sc_smpsw.smpsw_name));

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

static void
acpi_dalb_get_runtime_hotkeys(void *opaque)
{
        device_t dev = opaque;
        struct acpi_dalb_softc *sc = device_private(dev);

        if (!sc->sc_smpsw_valid)
                return;

        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                "invoking %s (runtime)\n", sc->sc_smpsw.smpsw_name));

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

static bool
acpi_dalb_resume(device_t dev, const pmf_qual_t *qual)
{
        struct acpi_dalb_softc *sc = device_private(dev);
        ACPI_STATUS rv;
        ACPI_BUFFER ret;

        rv = acpi_eval_struct(sc->sc_node->ad_handle, "GHID", &ret);
        if (ACPI_FAILURE(rv)) {
                aprint_error_dev(dev, "couldn't evaluate GHID: %s\n",
                    AcpiFormatException(rv));
                return false;
        }
        if (ret.Pointer)
                ACPI_FREE(ret.Pointer);

        return true;
}

MODULE(MODULE_CLASS_DRIVER, acpidalb, "sysmon_power");

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
acpidalb_modcmd(modcmd_t cmd, void *aux)
{
        int rv = 0;

        switch (cmd) {

        case MODULE_CMD_INIT:

#ifdef _MODULE
                rv = config_init_component(cfdriver_ioconf_acpidalb,
                    cfattach_ioconf_acpidalb, cfdata_ioconf_acpidalb);
#endif
                break;

        case MODULE_CMD_FINI:

#ifdef _MODULE
                rv = config_fini_component(cfdriver_ioconf_acpidalb,
                    cfattach_ioconf_acpidalb, cfdata_ioconf_acpidalb);
#endif
                break;

        default:
                rv = ENOTTY;
        }

        return rv;
}