gpiopower.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * Copyright (c) 2016 Justin Hibbits
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   19  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   21  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   22  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/gpio.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/reboot.h>
   39 
   40 #include <dev/ofw/ofw_bus.h>
   41 
   42 #include <dev/gpio/gpiobusvar.h>
   43 
   44 struct gpiopower_softc {
   45         gpio_pin_t      sc_pin;
   46         int             sc_rbmask;
   47 };
   48 
   49 static void gpiopower_assert(device_t dev, int howto);
   50 
   51 static int
   52 gpiopower_probe(device_t dev)
   53 {
   54 
   55         if (ofw_bus_is_compatible(dev, "gpio-poweroff")) {
   56                 device_set_desc(dev, "GPIO poweroff control");
   57                 return (0);
   58         } else if (ofw_bus_is_compatible(dev, "gpio-restart")) {
   59                 device_set_desc(dev, "GPIO restart control");
   60                 return (0);
   61         }
   62 
   63         return (ENXIO);
   64 }
   65 
   66 static int
   67 gpiopower_attach(device_t dev)
   68 {
   69         struct gpiopower_softc *sc;
   70         phandle_t node;
   71 
   72         sc = device_get_softc(dev);
   73 
   74         if ((node = ofw_bus_get_node(dev)) == -1)
   75                 return (ENXIO);
   76 
   77         if (ofw_gpiobus_parse_gpios(dev, "gpios", &sc->sc_pin) <= 0) {
   78                 device_printf(dev, "failed to map GPIO pin\n");
   79                 return (ENXIO);
   80         }
   81 
   82         if (ofw_bus_is_compatible(dev, "gpio-poweroff"))
   83                 sc->sc_rbmask = RB_HALT | RB_POWEROFF;
   84         else
   85                 sc->sc_rbmask = 0;
   86         EVENTHANDLER_REGISTER(shutdown_final, gpiopower_assert, dev,
   87             SHUTDOWN_PRI_LAST);
   88         gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
   89 
   90         return (0);
   91 }
   92 
   93 static void
   94 gpiopower_assert(device_t dev, int howto)
   95 {
   96         struct gpiopower_softc *sc;
   97         int do_assert;
   98 
   99         sc = device_get_softc(dev);
  100         do_assert = sc->sc_rbmask ? (sc->sc_rbmask & howto) :
  101             ((howto & RB_HALT) == 0);
  102 
  103         if (!do_assert)
  104                 return;
  105 
  106         if (howto & RB_POWEROFF)
  107                 device_printf(dev, "powering system off\n");
  108         else if ((howto & RB_HALT) == 0)
  109                 device_printf(dev, "resetting system\n");
  110         else
  111                 return;
  112 
  113         gpio_pin_set_active(sc->sc_pin, true);
  114 
  115         /* Wait a second for it to trip */
  116         DELAY(10000000);
  117 }
  118 
  119 static device_method_t gpiopower_methods[] = {
  120         /* Device interface */
  121         DEVMETHOD(device_probe,         gpiopower_probe),
  122         DEVMETHOD(device_attach,        gpiopower_attach),
  123 
  124         DEVMETHOD_END
  125 };
  126 
  127 static driver_t gpiopower_driver = {
  128         "gpiopower",
  129         gpiopower_methods,
  130         sizeof(struct gpiopower_softc)
  131 };
  132 
  133 DRIVER_MODULE(gpiopower, simplebus, gpiopower_driver, 0, 0);
  134 MODULE_DEPEND(gpiopower, gpiobus, 1, 1, 1);

Cache object: c84d8e540187b5b116707fd558f1d43a

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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