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/* $OpenBSD: acpials.c,v 1.2 2016/12/23 19:55:02 kettenis Exp $ */
/*
* Ambient Light Sensor device driver
* ACPI 5.0 spec section 9.2
*
* Copyright (c) 2016 joshua stein <jcs@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>
#include <dev/acpi/acpidev.h>
#include <dev/acpi/amltypes.h>
#include <dev/acpi/dsdt.h>
#include <sys/sensors.h>
/* #define ACPIALS_DEBUG */
#ifdef ACPIALS_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
struct acpials_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct acpi_softc *sc_acpi;
struct aml_node *sc_devnode;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
struct sensor_task *sc_sensor_task;
};
int acpials_match(struct device *, void *, void *);
void acpials_attach(struct device *, struct device *, void *);
int acpials_read(struct acpials_softc *);
int acpials_notify(struct aml_node *, int, void *);
void acpials_addtask(void *);
void acpials_update(void *, int);
struct cfattach acpials_ca = {
sizeof(struct acpials_softc),
acpials_match,
acpials_attach,
};
struct cfdriver acpials_cd = {
NULL, "acpials", DV_DULL
};
const char *acpials_hids[] = {
"ACPI0008",
NULL
};
int
acpials_match(struct device *parent, void *match, void *aux)
{
struct acpi_attach_args *aa = aux;
struct cfdata *cf = match;
return (acpi_matchhids(aa, acpials_hids, cf->cf_driver->cd_name));
}
void
acpials_attach(struct device *parent, struct device *self, void *aux)
{
struct acpials_softc *sc = (struct acpials_softc *)self;
struct acpi_attach_args *aa = aux;
int64_t st;
sc->sc_acpi = (struct acpi_softc *)parent;
sc->sc_devnode = aa->aaa_node;
printf(": %s\n", sc->sc_devnode->name);
if (aml_evalinteger(sc->sc_acpi, sc->sc_devnode, "_STA", 0, NULL, &st))
st = STA_PRESENT | STA_ENABLED | STA_DEV_OK;
if ((st & (STA_PRESENT | STA_ENABLED | STA_DEV_OK)) !=
(STA_PRESENT | STA_ENABLED | STA_DEV_OK))
return;
if (acpials_read(sc))
return;
strlcpy(sc->sc_sensordev.xname, DEVNAME(sc),
sizeof(sc->sc_sensordev.xname));
strlcpy(sc->sc_sensor.desc, "ambient light sensor",
sizeof(sc->sc_sensor.desc));
sc->sc_sensor.type = SENSOR_LUX;
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
/*
* aml_register_notify with ACPIDEV_POLL is too slow (10 second
* intervals), so register the task with sensors so we can specify the
* interval, which will then just inject an acpi task and tell it to
* wakeup to handle the task.
*/
if (!(sc->sc_sensor_task = sensor_task_register(sc, acpials_addtask,
1))) {
printf("%s: unable to register task\n", sc->sc_dev.dv_xname);
return;
}
/*
* But also install an event handler in case AML Notify()s us of any
* large changes - 9.2.7
*/
aml_register_notify(sc->sc_devnode, aa->aaa_dev, acpials_notify,
sc, ACPIDEV_NOPOLL);
sensordev_install(&sc->sc_sensordev);
}
int
acpials_read(struct acpials_softc *sc)
{
int64_t ali = 0;
/* 9.2.2 - "Current ambient light illuminance reading in lux" */
if (aml_evalinteger(sc->sc_acpi, sc->sc_devnode, "_ALI", 0, NULL,
&ali))
return 1;
sc->sc_sensor.value = (ali * 1000000);
return 0;
}
int
acpials_notify(struct aml_node *node, int notify_type, void *arg)
{
struct acpials_softc *sc = arg;
DPRINTF(("%s: %s: %d\n", sc->sc_dev.dv_xname, __func__, notify_type));
if (notify_type == 0x80)
acpials_read(sc);
return 0;
}
void
acpials_addtask(void *arg)
{
struct acpials_softc *sc = arg;
acpi_addtask(sc->sc_acpi, acpials_update, sc, 0);
acpi_wakeup(sc->sc_acpi);
}
void
acpials_update(void *arg0, int arg1)
{
struct acpials_softc *sc = arg0;
if (acpials_read(sc) == 0) {
DPRINTF(("%s: %s: %lld\n", sc->sc_dev.dv_xname, __func__,
sc->sc_sensor.value));
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
} else
sc->sc_sensor.flags |= SENSOR_FINVALID;
}
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