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("$FreeBSD$");
   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         IXP4XX_GPIO_LOCK();
   56         reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPOUTR);
   57         if (onoff)
   58                 reg &= ~GPIO_LED_STATUS_BIT;
   59         else
   60                 reg |= GPIO_LED_STATUS_BIT;
   61         GPIO_CONF_WRITE_4(sc, IXP425_GPIO_GPOUTR, reg);
   62         IXP4XX_GPIO_UNLOCK();
   63 }
   64 
   65 static int
   66 led_avila_probe(device_t dev)
   67 {
   68         device_set_desc(dev, "Gateworks Avila Front Panel LED");
   69         return (0);
   70 }
   71 
   72 static int
   73 led_avila_attach(device_t dev)
   74 {
   75         struct led_avila_softc *sc = device_get_softc(dev);
   76         struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
   77 
   78         sc->sc_dev = dev;
   79         sc->sc_iot = sa->sc_iot;
   80         sc->sc_gpio_ioh = sa->sc_gpio_ioh;
   81 
   82         /* Configure LED GPIO pin as output */
   83         GPIO_CONF_WRITE_4(sc, IXP425_GPIO_GPOER,
   84             GPIO_CONF_READ_4(sc, IXP425_GPIO_GPOER) &~ GPIO_LED_STATUS_BIT);
   85 
   86         sc->sc_led = led_create(led_func, sc, "gpioled");
   87 
   88         led_func(sc, 1);                /* Turn on LED */
   89 
   90         return (0);
   91 }
   92 
   93 static int
   94 led_avila_detach(device_t dev)
   95 {
   96         struct led_avila_softc *sc = device_get_softc(dev);
   97 
   98         if (sc->sc_led != NULL)
   99                 led_destroy(sc->sc_led);
  100         return (0);
  101 }
  102 
  103 static device_method_t led_avila_methods[] = {
  104         DEVMETHOD(device_probe,         led_avila_probe),
  105         DEVMETHOD(device_attach,        led_avila_attach),
  106         DEVMETHOD(device_detach,        led_avila_detach),
  107 
  108         {0, 0},
  109 };
  110 
  111 static driver_t led_avila_driver = {
  112         "led_avila",
  113         led_avila_methods,
  114         sizeof(struct led_avila_softc),
  115 };
  116 static devclass_t led_avila_devclass;
  117 
  118 DRIVER_MODULE(led_avila, ixp, led_avila_driver, led_avila_devclass, 0, 0);

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

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