The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/xscale/ixp425/avila_led.c

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    1 /*-
    2  * Copyright (c) 2006 Kevin Lo.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   15  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   16  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   17  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   18  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   19  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   20  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   22  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   23  */
   24 
   25 #include <sys/cdefs.h>
   26 __FBSDID("$FreeBSD: releng/8.2/sys/arm/xscale/ixp425/avila_led.c 194015 2009-06-11 17:05:13Z avg $");
   27 
   28 #include <sys/param.h>
   29 #include <sys/systm.h>
   30 #include <sys/kernel.h>
   31 #include <sys/module.h>
   32 #include <sys/bus.h>
   33 
   34 #include <arm/xscale/ixp425/ixp425reg.h>
   35 #include <arm/xscale/ixp425/ixp425var.h>
   36 
   37 #include <dev/led/led.h>
   38 
   39 #define GPIO_LED_STATUS 3
   40 #define GPIO_LED_STATUS_BIT     (1U << GPIO_LED_STATUS)
   41 
   42 struct led_avila_softc {
   43         device_t                sc_dev;
   44         bus_space_tag_t         sc_iot;
   45         bus_space_handle_t      sc_gpio_ioh;
   46         struct cdev             *sc_led;
   47 };
   48 
   49 static void
   50 led_func(void *arg, int onoff)
   51 {
   52         struct led_avila_softc *sc = arg;
   53         uint32_t reg;
   54 
   55         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPOUTR);
   56         if (onoff)
   57                 reg &= ~GPIO_LED_STATUS_BIT;
   58         else
   59                 reg |= GPIO_LED_STATUS_BIT;
   60         GPIO_CONF_WRITE_4(sc, IXP425_GPIO_GPOUTR, reg);
   61 }
   62 
   63 static int
   64 led_avila_probe(device_t dev)
   65 {
   66         device_set_desc(dev, "Gateworks Avila Front Panel LED");
   67         return (0);
   68 }
   69 
   70 static int
   71 led_avila_attach(device_t dev)
   72 {
   73         struct led_avila_softc *sc = device_get_softc(dev);
   74         struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
   75 
   76         sc->sc_dev = dev;
   77         sc->sc_iot = sa->sc_iot;
   78         sc->sc_gpio_ioh = sa->sc_gpio_ioh;
   79 
   80         /* Configure LED GPIO pin as output */
   81         GPIO_CONF_WRITE_4(sc, IXP425_GPIO_GPOER,
   82             GPIO_CONF_READ_4(sc, IXP425_GPIO_GPOER) &~ GPIO_LED_STATUS_BIT);
   83 
   84         sc->sc_led = led_create(led_func, sc, "gpioled");
   85 
   86         led_func(sc, 1);                /* Turn on LED */
   87 
   88         return (0);
   89 }
   90 
   91 static int
   92 led_avila_detach(device_t dev)
   93 {
   94         struct led_avila_softc *sc = device_get_softc(dev);
   95 
   96         if (sc->sc_led != NULL)
   97                 led_destroy(sc->sc_led);
   98         return (0);
   99 }
  100 
  101 static device_method_t led_avila_methods[] = {
  102         DEVMETHOD(device_probe,         led_avila_probe),
  103         DEVMETHOD(device_attach,        led_avila_attach),
  104         DEVMETHOD(device_detach,        led_avila_detach),
  105 
  106         {0, 0},
  107 };
  108 
  109 static driver_t led_avila_driver = {
  110         "led_avila",
  111         led_avila_methods,
  112         sizeof(struct led_avila_softc),
  113 };
  114 static devclass_t led_avila_devclass;
  115 
  116 DRIVER_MODULE(led_avila, ixp, led_avila_driver, led_avila_devclass, 0, 0);

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