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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
* 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>
#include "opt_platform.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/led/led.h>
#include "gpiobus_if.h"
/*
* Only one pin for led
*/
#define GPIOLED_PIN 0
#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define GPIOLED_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
device_get_nameunit((_sc)->sc_dev), "gpioled", MTX_DEF)
#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
struct gpioled_softc
{
device_t sc_dev;
device_t sc_busdev;
struct mtx sc_mtx;
struct cdev *sc_leddev;
int sc_softinvert;
};
static void gpioled_control(void *, int);
static int gpioled_probe(device_t);
static int gpioled_attach(device_t);
static int gpioled_detach(device_t);
static void
gpioled_control(void *priv, int onoff)
{
struct gpioled_softc *sc;
sc = (struct gpioled_softc *)priv;
if (sc->sc_softinvert)
onoff = !onoff;
GPIOLED_LOCK(sc);
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
GPIOLED_UNLOCK(sc);
}
static int
gpioled_probe(device_t dev)
{
device_set_desc(dev, "GPIO led");
return (BUS_PROBE_DEFAULT);
}
static int
gpioled_inv(device_t dev, uint32_t *pin_flags)
{
struct gpioled_softc *sc;
int invert;
uint32_t pin_caps;
sc = device_get_softc(dev);
if (resource_int_value(device_get_name(dev),
device_get_unit(dev), "invert", &invert))
invert = 0;
if (GPIOBUS_PIN_GETCAPS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
&pin_caps) != 0) {
if (bootverbose)
device_printf(sc->sc_dev, "unable to get pin caps\n");
return (-1);
}
if (pin_caps & GPIO_PIN_INVOUT)
*pin_flags &= ~GPIO_PIN_INVOUT;
sc->sc_softinvert = 0;
if (invert) {
const char *invmode;
if (resource_string_value(device_get_name(dev),
device_get_unit(dev), "invmode", &invmode))
invmode = NULL;
if (invmode) {
if (!strcmp(invmode, "sw"))
sc->sc_softinvert = 1;
else if (!strcmp(invmode, "hw")) {
if (pin_caps & GPIO_PIN_INVOUT)
*pin_flags |= GPIO_PIN_INVOUT;
else {
device_printf(sc->sc_dev, "hardware pin inversion not supported\n");
return (-1);
}
} else {
if (strcmp(invmode, "auto") != 0)
device_printf(sc->sc_dev, "invalid pin inversion mode\n");
invmode = NULL;
}
}
/*
* auto inversion mode: use hardware support if available, else fallback to
* software emulation.
*/
if (invmode == NULL) {
if (pin_caps & GPIO_PIN_INVOUT)
*pin_flags |= GPIO_PIN_INVOUT;
else
sc->sc_softinvert = 1;
}
}
MPASS(!invert ||
(((*pin_flags & GPIO_PIN_INVOUT) != 0) && !sc->sc_softinvert) ||
(((*pin_flags & GPIO_PIN_INVOUT) == 0) && sc->sc_softinvert));
return (invert);
}
static int
gpioled_attach(device_t dev)
{
struct gpioled_softc *sc;
int state;
const char *name;
uint32_t pin_flags;
int invert;
sc = device_get_softc(dev);
sc->sc_dev = dev;
sc->sc_busdev = device_get_parent(dev);
GPIOLED_LOCK_INIT(sc);
if (resource_string_value(device_get_name(dev),
device_get_unit(dev), "name", &name))
name = NULL;
if (resource_int_value(device_get_name(dev),
device_get_unit(dev), "state", &state))
state = 0;
pin_flags = GPIO_PIN_OUTPUT;
invert = gpioled_inv(dev, &pin_flags);
if (invert < 0)
return (ENXIO);
device_printf(sc->sc_dev, "state %d invert %s\n",
state, (invert ? (sc->sc_softinvert ? "sw" : "hw") : "no"));
if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
pin_flags) != 0) {
if (bootverbose)
device_printf(sc->sc_dev, "unable to set pin flags, %#x\n", pin_flags);
return (ENXIO);
}
sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
device_get_nameunit(dev), state);
return (0);
}
static int
gpioled_detach(device_t dev)
{
struct gpioled_softc *sc;
sc = device_get_softc(dev);
if (sc->sc_leddev) {
led_destroy(sc->sc_leddev);
sc->sc_leddev = NULL;
}
GPIOLED_LOCK_DESTROY(sc);
return (0);
}
static device_method_t gpioled_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, gpioled_probe),
DEVMETHOD(device_attach, gpioled_attach),
DEVMETHOD(device_detach, gpioled_detach),
DEVMETHOD_END
};
static driver_t gpioled_driver = {
"gpioled",
gpioled_methods,
sizeof(struct gpioled_softc),
};
DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, 0, 0);
MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
MODULE_VERSION(gpioled, 1);
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