d442709662
control callback function. This makes gpioled(4) works even if the pin is accidentally set to an input. Approved by: adrian (mentor)
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*-
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* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/led/led.h>
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#include <sys/gpio.h>
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#include "gpiobus_if.h"
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/*
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* Only one pin for led
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*/
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#define GPIOLED_PIN 0
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#define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define GPIOLED_LOCK_INIT(_sc) \
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mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
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"gpioled", MTX_DEF)
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#define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
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struct gpioled_softc
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{
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device_t sc_dev;
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device_t sc_busdev;
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struct mtx sc_mtx;
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struct cdev *sc_leddev;
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};
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static void gpioled_control(void *, int);
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static int gpioled_probe(device_t);
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static int gpioled_attach(device_t);
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static int gpioled_detach(device_t);
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static void
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gpioled_control(void *priv, int onoff)
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{
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struct gpioled_softc *sc = priv;
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GPIOLED_LOCK(sc);
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GPIOBUS_LOCK_BUS(sc->sc_busdev);
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GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev);
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GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
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GPIO_PIN_OUTPUT);
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GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
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onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
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GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
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GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
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GPIOLED_UNLOCK(sc);
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}
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static int
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gpioled_probe(device_t dev)
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{
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device_set_desc(dev, "GPIO led");
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return (0);
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}
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static int
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gpioled_attach(device_t dev)
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{
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struct gpioled_softc *sc;
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const char *name;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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sc->sc_busdev = device_get_parent(dev);
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GPIOLED_LOCK_INIT(sc);
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if (resource_string_value(device_get_name(dev),
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device_get_unit(dev), "name", &name))
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name = NULL;
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sc->sc_leddev = led_create(gpioled_control, sc, name ? name :
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device_get_nameunit(dev));
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return (0);
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}
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static int
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gpioled_detach(device_t dev)
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{
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struct gpioled_softc *sc;
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sc = device_get_softc(dev);
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if (sc->sc_leddev) {
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led_destroy(sc->sc_leddev);
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sc->sc_leddev = NULL;
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}
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GPIOLED_LOCK_DESTROY(sc);
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return (0);
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}
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static devclass_t gpioled_devclass;
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static device_method_t gpioled_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gpioled_probe),
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DEVMETHOD(device_attach, gpioled_attach),
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DEVMETHOD(device_detach, gpioled_detach),
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{ 0, 0 }
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};
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static driver_t gpioled_driver = {
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"gpioled",
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gpioled_methods,
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sizeof(struct gpioled_softc),
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};
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DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
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