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/*-
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <dev/led/led.h>
#include <sys/gpio.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;
};
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 = priv;
GPIOLED_LOCK(sc);
GPIOBUS_LOCK_BUS(sc->sc_busdev);
GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev);
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
GPIOLED_UNLOCK(sc);
}
static int
gpioled_probe(device_t dev)
{
device_set_desc(dev, "GPIO led");
return (0);
}
static int
gpioled_attach(device_t dev)
{
struct gpioled_softc *sc;
const char *name;
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;
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
GPIO_PIN_OUTPUT);
sc->sc_leddev = led_create(gpioled_control, sc, name ? name :
device_get_nameunit(dev));
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 devclass_t gpioled_devclass;
static device_method_t gpioled_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, gpioled_probe),
DEVMETHOD(device_attach, gpioled_attach),
DEVMETHOD(device_detach, gpioled_detach),
{ 0, 0 }
};
static driver_t gpioled_driver = {
"gpioled",
gpioled_methods,
sizeof(struct gpioled_softc),
};
DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
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