/*      $NetBSD: wmi_msi.c,v 1.5 2011/02/16 13:15:49 jruoho Exp $ */

/*-
* Copyright (c) 2010 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_msi.c,v 1.5 2011/02/16 13:15:49 jruoho 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>

#define _COMPONENT                      ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME                        ("wmi_msi")

#define WMI_MSI_HOTKEY_BRIGHTNESS_UP    0xD0
#define WMI_MSI_HOTKEY_BRIGHTNESS_DOWN  0xD1
#define WMI_MSI_HOTKEY_VOLUME_UP        0xD2
#define WMI_MSI_HOTKEY_VOLUME_DOWN      0xD3
/*      WMI_MSI_HOTKEY_UNKNOWN          0xXXXX */

#define WMI_MSI_GUID_EVENT              "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"

struct wmi_msi_softc {
       device_t                sc_dev;
       device_t                sc_parent;
};

static int      wmi_msi_match(device_t, cfdata_t, void *);
static void     wmi_msi_attach(device_t, device_t, void *);
static int      wmi_msi_detach(device_t, int);
static void     wmi_msi_notify_handler(ACPI_HANDLE, uint32_t, void *);
static bool     wmi_msi_suspend(device_t, const pmf_qual_t *);
static bool     wmi_msi_resume(device_t, const pmf_qual_t *);

CFATTACH_DECL_NEW(wmimsi, sizeof(struct wmi_msi_softc),
   wmi_msi_match, wmi_msi_attach, wmi_msi_detach, NULL);

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

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

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

       rv = acpi_wmi_event_register(parent, wmi_msi_notify_handler);

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

       aprint_naive("\n");
       aprint_normal(": MSI WMI mappings\n");

       (void)pmf_device_register(self, wmi_msi_suspend, wmi_msi_resume);
}

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

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

       return 0;
}

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

       (void)acpi_wmi_event_deregister(parent);

       return true;
}

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

       (void)acpi_wmi_event_register(parent, wmi_msi_notify_handler);

       return true;
}

static void
wmi_msi_notify_handler(ACPI_HANDLE hdl, uint32_t evt, void *aux)
{
       struct wmi_msi_softc *sc;
       device_t self = aux;
       ACPI_OBJECT *obj;
       ACPI_BUFFER buf;
       ACPI_STATUS rv;
       uint32_t val;

       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_AML_NUMERIC_OVERFLOW;
               goto out;
       }

       val = obj->Integer.Value;

       switch (val) {

       case WMI_MSI_HOTKEY_BRIGHTNESS_DOWN:
               pmf_event_inject(NULL, PMFE_DISPLAY_BRIGHTNESS_DOWN);
               break;

       case WMI_MSI_HOTKEY_BRIGHTNESS_UP:
               pmf_event_inject(NULL, PMFE_DISPLAY_BRIGHTNESS_UP);
               break;

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

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

       default:
               aprint_normal_dev(sc->sc_dev,
                   "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))
               aprint_error_dev(sc->sc_dev, "failed to get data for "
                   "event 0x%02X: %s\n", evt, AcpiFormatException(rv));
}

MODULE(MODULE_CLASS_DRIVER, wmimsi, "acpiwmi");

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

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

       switch (cmd) {

       case MODULE_CMD_INIT:

#ifdef _MODULE
               rv = config_init_component(cfdriver_ioconf_wmimsi,
                   cfattach_ioconf_wmimsi, cfdata_ioconf_wmimsi);
#endif
               break;

       case MODULE_CMD_FINI:

#ifdef _MODULE
               rv = config_fini_component(cfdriver_ioconf_wmimsi,
                   cfattach_ioconf_wmimsi, cfdata_ioconf_wmimsi);
#endif
               break;

       default:
               rv = ENOTTY;
       }

       return rv;
}

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