/*      $NetBSD: acpi_fan.c,v 1.9 2021/01/29 15:49:55 thorpej Exp $ */

/*-
* Copyright (c) 2011 Jukka Ruohonen <[email protected]>
* 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 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: acpi_fan.c,v 1.9 2021/01/29 15:49:55 thorpej Exp $");

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

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

#include <dev/sysmon/sysmonvar.h>

#define _COMPONENT              ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME                ("acpi_fan")

struct acpifan_softc {
       device_t                 sc_dev;
       struct acpi_devnode     *sc_node;
       struct sysmon_envsys    *sc_sme;
       envsys_data_t            sc_sensor;
};

static const struct device_compatible_entry compat_data[] = {
       { .compat = "PNP0C0B" },
       DEVICE_COMPAT_EOL
};

static int      acpifan_match(device_t, cfdata_t, void *);
static void     acpifan_attach(device_t, device_t, void *);
static int      acpifan_detach(device_t, int);
static bool     acpifan_suspend(device_t, const pmf_qual_t *);
static bool     acpifan_resume(device_t, const pmf_qual_t *);
static bool     acpifan_shutdown(device_t, int);
static bool     acpifan_sensor_init(device_t);
static void     acpifan_sensor_state(void *);
static void     acpifan_sensor_refresh(struct sysmon_envsys *,envsys_data_t *);

CFATTACH_DECL_NEW(acpifan, sizeof(struct acpifan_softc),
   acpifan_match, acpifan_attach, acpifan_detach, NULL);

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

       return acpi_compatible_match(aa, compat_data);
}

static void
acpifan_attach(device_t parent, device_t self, void *aux)
{
       struct acpifan_softc *sc = device_private(self);
       struct acpi_attach_args *aa = aux;
       ACPI_HANDLE tmp;
       ACPI_STATUS rv;

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

       aprint_naive("\n");
       aprint_normal(": ACPI Fan\n");

       if (acpifan_sensor_init(self) != true)
               aprint_error_dev(self, "failed to initialize\n");

       (void)acpi_power_register(sc->sc_node->ad_handle);
       (void)pmf_device_register1(self, acpifan_suspend,
           acpifan_resume, acpifan_shutdown);

       rv = AcpiGetHandle(sc->sc_node->ad_handle, "_FIF", &tmp);

       if (ACPI_SUCCESS(rv))
               aprint_verbose_dev(self, "ACPI 4.0 functionality present\n");
}

static int
acpifan_detach(device_t self, int flags)
{
       struct acpifan_softc *sc = device_private(self);

       (void)acpi_power_set(sc->sc_node->ad_handle, ACPI_STATE_D0);

       pmf_device_deregister(self);
       acpi_power_deregister(sc->sc_node->ad_handle);

       if (sc->sc_sme != NULL)
               sysmon_envsys_unregister(sc->sc_sme);

       return 0;
}

static bool
acpifan_suspend(device_t self, const pmf_qual_t *qual)
{
       struct acpifan_softc *sc = device_private(self);

       (void)acpi_power_set(sc->sc_node->ad_handle, ACPI_STATE_D0);

       return true;
}

static bool
acpifan_resume(device_t self, const pmf_qual_t *qual)
{
       struct acpifan_softc *sc = device_private(self);

       (void)acpi_power_set(sc->sc_node->ad_handle, ACPI_STATE_D3);

       return true;
}

static bool
acpifan_shutdown(device_t self, int how)
{
       struct acpifan_softc *sc = device_private(self);

       (void)acpi_power_set(sc->sc_node->ad_handle, ACPI_STATE_D0);

       return true;
}

static bool
acpifan_sensor_init(device_t self)
{
       struct acpifan_softc *sc = device_private(self);
       int state;

       if (acpi_power_get(sc->sc_node->ad_handle, &state) != true)
               return false;

       sc->sc_sme = sysmon_envsys_create();

       acpifan_sensor_state(self);
       sc->sc_sensor.units = ENVSYS_INDICATOR;

       (void)strlcpy(sc->sc_sensor.desc, "state", sizeof(sc->sc_sensor.desc));

       sc->sc_sme->sme_cookie = self;
       sc->sc_sme->sme_flags = SME_POLL_ONLY;
       sc->sc_sme->sme_name = device_xname(self);
       sc->sc_sme->sme_refresh = acpifan_sensor_refresh;

       if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor) != 0)
               goto fail;

       if (sysmon_envsys_register(sc->sc_sme) != 0)
               goto fail;

       return true;

fail:
       sysmon_envsys_destroy(sc->sc_sme);
       sc->sc_sme = NULL;

       return false;
}

static void
acpifan_sensor_state(void *arg)
{
       struct acpifan_softc *sc;
       device_t self;
       int state;

       self = arg;
       sc = device_private(self);
       state = ACPI_STATE_ERROR;

       (void)acpi_power_get(sc->sc_node->ad_handle, &state);

       switch (state) {

       case ACPI_STATE_D0:
       case ACPI_STATE_D1:
       case ACPI_STATE_D2:
               sc->sc_sensor.value_cur = 1;
               sc->sc_sensor.state = ENVSYS_SVALID;
               break;

       case ACPI_STATE_D3:
               sc->sc_sensor.value_cur = 0;
               sc->sc_sensor.state = ENVSYS_SVALID;
               break;

       default:
               sc->sc_sensor.state = ENVSYS_SINVALID;
               break;
       }
}

static void
acpifan_sensor_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
{
       device_t self = sme->sme_cookie;

       (void)AcpiOsExecute(OSL_NOTIFY_HANDLER, acpifan_sensor_state, self);
}

MODULE(MODULE_CLASS_DRIVER, acpifan, "sysmon_envsys");

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

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

       switch (cmd) {

       case MODULE_CMD_INIT:

#ifdef _MODULE
               rv = config_init_component(cfdriver_ioconf_acpifan,
                   cfattach_ioconf_acpifan, cfdata_ioconf_acpifan);
#endif
               break;

       case MODULE_CMD_FINI:

#ifdef _MODULE
               rv = config_fini_component(cfdriver_ioconf_acpifan,
                   cfattach_ioconf_acpifan, cfdata_ioconf_acpifan);
#endif
               break;

       default:
               rv = ENOTTY;
       }

       return rv;
}

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