FreeBSD/Linux Kernel Cross Reference
sys/dev/gpio/gpioled.c

     /*-
      * 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: releng/9.0/sys/dev/gpio/gpioled.c 214971 2010-11-08 03:08:01Z thompsa $");
    
    #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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