/*      $NetBSD: wmi_eeepc.c,v 1.4 2015/04/23 23:23:00 pgoyette Exp $ */

/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jukka Ruohonen.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: wmi_eeepc.c,v 1.4 2015/04/23 23:23:00 pgoyette Exp $");

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

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

#include <dev/sysmon/sysmonvar.h>

#define _COMPONENT                      ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME                        ("wmi_eeepc")


/*
* Current brightness is reported by events in the range of 0x10 to 0x2f.
* The low nibble containing a value from 0x0 to 0xA proportionate to
* brightness, 0x0 indicates minimum illumination, not backlight off.
*/
#define WMI_EEEPC_HK_BACKLIGHT_STATUS_BRIGHTNESS_MASK 0x0f /* 0x0 to 0xA */
#define WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_MASK (~WMI_EEEPC_HK_BACKLIGHT_STATUS_BRIGHTNESS_MASK)
#define WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_INC 0x10
#define WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_DEC 0x20

#define WMI_EEEPC_HK_VOLUME_UP          0x30
#define WMI_EEEPC_HK_VOLUME_DOWN        0x31
#define WMI_EEEPC_HK_VOLUME_MUTE        0x32
#define WMI_EEEPC_HK_EXPRESSGATE        0x5C    /* Also, "SuperHybrid" */
#define WMI_EEEPC_HK_TOUCHPAD           0x6B
#define WMI_EEEPC_HK_WIRELESS           0x88
#define WMI_EEEPC_HK_WEBCAM             0xBD
#define WMI_EEEPC_HK_DISPLAY_CYCLE      0xCC
#define WMI_EEEPC_HK_DISPLAY_SAVER      0xE8
#define WMI_EEEPC_HK_DISPLAY_OFF        0xE9
                                               /* Unlabeled keys on 1215T */
#define WMI_EEEPC_HK_UNKNOWN_xEC        0xEC    /* Fn+E */
#define WMI_EEEPC_HK_UNKNOWN_xED        0xED    /* Fn+D */
#define WMI_EEEPC_HK_UNKNOWN_xEE        0xEE    /* Fn+S */
#define WMI_EEEPC_HK_UNKNOWN_xEF        0xEF    /* Fn+F */

#define WMI_EEEPC_IS_BACKLIGHT_STATUS(x) (((x & WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_MASK) == WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_INC) || ((x & WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_MASK) == WMI_EEEPC_HK_BACKLIGHT_STATUS_DIRECTION_DEC))

enum eeepc_smpsw {
       WMI_EEEPC_PSW_EXPRESSGATE = 0,
       WMI_EEEPC_PSW_TOUCHPAD,
       WMI_EEEPC_PSW_WIRELESS,
       WMI_EEEPC_PSW_WEBCAM,
       WMI_EEEPC_PSW_DISPLAY_CYCLE,
       WMI_EEEPC_PSW_DISPLAY_SAVER,
       WMI_EEEPC_PSW_DISPLAY_OFF,
       WMI_EEEPC_PSW_UNKNOWN_xEC,
       WMI_EEEPC_PSW_UNKNOWN_xED,
       WMI_EEEPC_PSW_UNKNOWN_xEE,
       WMI_EEEPC_PSW_UNKNOWN_xEF,
       WMI_EEEPC_PSW_COUNT     /* Must be last. */
};

#define WMI_EEEPC_GUID_EVENT            "ABBC0F72-8EA1-11D1-00A0-C90629100000"

struct wmi_eeepc_softc {
       device_t                sc_dev;
       device_t                sc_parent;
       struct sysmon_pswitch   sc_psw[WMI_EEEPC_PSW_COUNT];
       bool                    sc_psw_valid[WMI_EEEPC_PSW_COUNT];
};

static int      wmi_eeepc_match(device_t, cfdata_t, void *);
static void     wmi_eeepc_attach(device_t, device_t, void *);
static int      wmi_eeepc_detach(device_t, int);
static void     wmi_eeepc_notify_handler(ACPI_HANDLE, uint32_t, void *);
static bool     wmi_eeepc_suspend(device_t, const pmf_qual_t *);
static bool     wmi_eeepc_resume(device_t, const pmf_qual_t *);

CFATTACH_DECL_NEW(wmieeepc, sizeof(struct wmi_eeepc_softc),
   wmi_eeepc_match, wmi_eeepc_attach, wmi_eeepc_detach, NULL);

static int
wmi_eeepc_match(device_t parent, cfdata_t match, void *aux)
{
       return acpi_wmi_guid_match(parent, WMI_EEEPC_GUID_EVENT);
}

static void
wmi_eeepc_attach(device_t parent, device_t self, void *aux)
{
       struct wmi_eeepc_softc *sc = device_private(self);
       ACPI_STATUS rv;

       sc->sc_dev = self;
       sc->sc_parent = parent;

       rv = acpi_wmi_event_register(parent, wmi_eeepc_notify_handler);

       if (ACPI_FAILURE(rv)) {
               aprint_error(": failed to install WMI notify handler\n");
               return;
       }

       aprint_naive("\n");
       aprint_normal(": Asus Eee PC WMI mappings\n");

       memset(sc->sc_psw, 0, sizeof(sc->sc_psw));
       sc->sc_psw[WMI_EEEPC_PSW_EXPRESSGATE].smpsw_name = "expressgate";
       sc->sc_psw[WMI_EEEPC_PSW_TOUCHPAD].smpsw_name = "touchpad-toggle";
       sc->sc_psw[WMI_EEEPC_PSW_WIRELESS].smpsw_name = "wireless-toggle";
       sc->sc_psw[WMI_EEEPC_PSW_WEBCAM].smpsw_name = "camera-button";
       sc->sc_psw[WMI_EEEPC_PSW_DISPLAY_CYCLE].smpsw_name = PSWITCH_HK_DISPLAY_CYCLE;
       sc->sc_psw[WMI_EEEPC_PSW_DISPLAY_SAVER].smpsw_name = PSWITCH_HK_LOCK_SCREEN;
       sc->sc_psw[WMI_EEEPC_PSW_DISPLAY_OFF].smpsw_name = "display-off";
       sc->sc_psw[WMI_EEEPC_PSW_UNKNOWN_xEC].smpsw_name = "unlabeled-xEC";
       sc->sc_psw[WMI_EEEPC_PSW_UNKNOWN_xED].smpsw_name = "unlabeled-xED";
       sc->sc_psw[WMI_EEEPC_PSW_UNKNOWN_xEE].smpsw_name = "unlabeled-xEE";
       sc->sc_psw[WMI_EEEPC_PSW_UNKNOWN_xEF].smpsw_name = "unlabeled-xEF";

       for (int i = 0; i < WMI_EEEPC_PSW_COUNT; i++) {
               KASSERT(sc->sc_psw[i].smpsw_name != NULL);
               sc->sc_psw[i].smpsw_type = PSWITCH_TYPE_HOTKEY;
               if (sysmon_pswitch_register(&sc->sc_psw[i]) == 0) {
                       sc->sc_psw_valid[i] = true;
               } else {
                       sc->sc_psw_valid[i] = false;
                       aprint_error_dev(self,
                           "hotkey[%d] registration failed\n", i);
               }
       }

       (void)pmf_device_register(self, wmi_eeepc_suspend, wmi_eeepc_resume);
}

static int
wmi_eeepc_detach(device_t self, int flags)
{
       struct wmi_eeepc_softc *sc = device_private(self);
       device_t parent = sc->sc_parent;


       for (int i = 0; i < WMI_EEEPC_PSW_COUNT; i++) {
               if (sc->sc_psw_valid[i] == true) {
                       sysmon_pswitch_unregister(&sc->sc_psw[i]);
                       sc->sc_psw_valid[i] = false;
               }
       }

       (void)pmf_device_deregister(self);
       (void)acpi_wmi_event_deregister(parent);

       return 0;
}

static bool
wmi_eeepc_suspend(device_t self, const pmf_qual_t *qual)
{
       struct wmi_eeepc_softc *sc = device_private(self);
       device_t parent = sc->sc_parent;

       (void)acpi_wmi_event_deregister(parent);

       return true;
}

static bool
wmi_eeepc_resume(device_t self, const pmf_qual_t *qual)
{
       struct wmi_eeepc_softc *sc = device_private(self);
       device_t parent = sc->sc_parent;

       (void)acpi_wmi_event_register(parent, wmi_eeepc_notify_handler);

       return true;
}

static void
wmi_eeepc_pswitch_event(struct wmi_eeepc_softc *sc, enum eeepc_smpsw key)
{
       if (sc->sc_psw_valid[key] != true) {
               device_printf(sc->sc_dev, "hotkey[%d] not registered\n", key);
               return;
       }

       /*
        * This function is called upon key release,
        * but the default powerd scripts expect presses.
        *
        * Anyway, we may as well send the make and the break event.
        */

       sysmon_pswitch_event(&sc->sc_psw[key], PSWITCH_EVENT_PRESSED);
       sysmon_pswitch_event(&sc->sc_psw[key], PSWITCH_EVENT_RELEASED);
}

static void
wmi_eeepc_notify_handler(ACPI_HANDLE hdl, uint32_t evt, void *aux)
{
       struct wmi_eeepc_softc *sc;
       device_t self = aux;
       ACPI_OBJECT *obj;
       ACPI_BUFFER buf;
       ACPI_STATUS rv;
       uint32_t val = 0; /* XXX GCC */

       buf.Pointer = NULL;

       sc = device_private(self);
       rv = acpi_wmi_event_get(sc->sc_parent, evt, &buf);

       if (ACPI_FAILURE(rv))
               goto out;

       obj = buf.Pointer;

       if (obj->Type != ACPI_TYPE_INTEGER) {
               rv = AE_TYPE;
               goto out;
       }

       if (obj->Integer.Value > UINT32_MAX) {
               rv = AE_LIMIT;
               goto out;
       }

       val = obj->Integer.Value;

       if (WMI_EEEPC_IS_BACKLIGHT_STATUS(val)) {
               /* We'll silently ignore these for now. */
               goto out;
       }

       switch (val) {

       case WMI_EEEPC_HK_VOLUME_UP:
               pmf_event_inject(NULL, PMFE_AUDIO_VOLUME_UP);
               break;

       case WMI_EEEPC_HK_VOLUME_DOWN:
               pmf_event_inject(NULL, PMFE_AUDIO_VOLUME_DOWN);
               break;

       case WMI_EEEPC_HK_VOLUME_MUTE:
               pmf_event_inject(NULL, PMFE_AUDIO_VOLUME_TOGGLE);
               break;

       case WMI_EEEPC_HK_EXPRESSGATE:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_EXPRESSGATE);
               break;

       case WMI_EEEPC_HK_TOUCHPAD:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_TOUCHPAD);
               break;

       case WMI_EEEPC_HK_WIRELESS:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_WIRELESS);
               break;

       case WMI_EEEPC_HK_WEBCAM:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_WEBCAM);
               break;

       case WMI_EEEPC_HK_DISPLAY_CYCLE:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_DISPLAY_CYCLE);
               break;

       case WMI_EEEPC_HK_DISPLAY_SAVER:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_DISPLAY_SAVER);
               break;

       case WMI_EEEPC_HK_DISPLAY_OFF:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_DISPLAY_OFF);
               break;

       case WMI_EEEPC_HK_UNKNOWN_xEC:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_UNKNOWN_xEC);
               break;

       case WMI_EEEPC_HK_UNKNOWN_xED:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_UNKNOWN_xED);
               break;

       case WMI_EEEPC_HK_UNKNOWN_xEE:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_UNKNOWN_xEE);
               break;

       case WMI_EEEPC_HK_UNKNOWN_xEF:
               wmi_eeepc_pswitch_event(sc, WMI_EEEPC_PSW_UNKNOWN_xEF);
               break;

       default:
               device_printf(self, "unknown key 0x%02X for event 0x%02X\n",
                   val, evt);
               break;
       }

out:
       if (buf.Pointer != NULL)
               ACPI_FREE(buf.Pointer);

       if (ACPI_FAILURE(rv))
               device_printf(self, "failed to get data for "
                   "event 0x%02X: %s\n", evt, AcpiFormatException(rv));
}

MODULE(MODULE_CLASS_DRIVER, wmieeepc, "acpiwmi,sysmon_power");

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

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

       switch (cmd) {

       case MODULE_CMD_INIT:

#ifdef _MODULE
               rv = config_init_component(cfdriver_ioconf_wmieeepc,
                   cfattach_ioconf_wmieeepc, cfdata_ioconf_wmieeepc);
#endif
               break;

       case MODULE_CMD_FINI:

#ifdef _MODULE
               rv = config_fini_component(cfdriver_ioconf_wmieeepc,
                   cfattach_ioconf_wmieeepc, cfdata_ioconf_wmieeepc);
#endif
               break;

       default:
               rv = ENOTTY;
       }

       return rv;
}

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