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/* $OpenBSD: gpiocharger.c,v 1.2 2022/04/06 18:59:28 naddy Exp $ */
/*
* Copyright (c) 2021 Klemens Nanni <kn@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 <sys/gpio.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/gpio/gpiovar.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <sys/sensors.h>
struct gpiocharger_softc {
struct device sc_dev;
int sc_node;
uint32_t *sc_charger_pin;
struct ksensor sc_sensor;
struct ksensordev sc_sensordev;
};
int gpiocharger_match(struct device *, void *, void *);
void gpiocharger_attach(struct device *, struct device *, void *);
const struct cfattach gpiocharger_ca = {
sizeof (struct gpiocharger_softc), gpiocharger_match, gpiocharger_attach
};
struct cfdriver gpiocharger_cd = {
NULL, "gpiocharger", DV_DULL
};
void gpiocharger_update_charger(void *);
int
gpiocharger_match(struct device *parent, void *match, void *aux)
{
const struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "gpio-charger");
}
void
gpiocharger_attach(struct device *parent, struct device *self, void *aux)
{
struct gpiocharger_softc *sc = (struct gpiocharger_softc *)self;
struct fdt_attach_args *faa = aux;
char *charger_type, *gpios_property;
int charger_type_len, gpios_len;
int node = faa->fa_node;
pinctrl_byname(node, "default");
charger_type_len = OF_getproplen(node, "charger-type");
if (charger_type_len <= 0)
goto nocharger;
gpios_property = "gpios";
gpios_len = OF_getproplen(node, gpios_property);
if (gpios_len <= 0) {
gpios_property = "charger-status-gpios";
gpios_len = OF_getproplen(node, gpios_property);
if (gpios_len <= 0)
goto nocharger;
}
charger_type = malloc(charger_type_len, M_TEMP, M_WAITOK);
OF_getprop(node, "charger-type", charger_type, charger_type_len);
sc->sc_charger_pin = malloc(gpios_len, M_DEVBUF, M_WAITOK);
OF_getpropintarray(node, gpios_property, sc->sc_charger_pin, gpios_len);
gpio_controller_config_pin(sc->sc_charger_pin, GPIO_CONFIG_INPUT);
strlcpy(sc->sc_sensor.desc, charger_type, sizeof(sc->sc_sensor.desc));
strlcat(sc->sc_sensor.desc, " power supply",
sizeof(sc->sc_sensor.desc));
sc->sc_sensor.type = SENSOR_INDICATOR;
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sensordev_install(&sc->sc_sensordev);
sensor_task_register(sc, gpiocharger_update_charger, 5);
printf(": \"%s\"\n", charger_type);
free(charger_type, M_TEMP, charger_type_len);
return;
nocharger:
printf(": no charger\n");
}
void
gpiocharger_update_charger(void *arg)
{
struct gpiocharger_softc *sc = arg;
sc->sc_sensor.value = gpio_controller_get_pin(sc->sc_charger_pin);
}
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