8663029018
Summary: This implements part of the gpio-poweroff and gpio-restart device tree bindings. Optional properties are not handled currently. It also currently only supports level-triggered reset. Reviewed By: gonzo Differential Revision: https://reviews.freebsd.org/D8521
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/*-
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* Copyright (c) 2016 Justin Hibbits
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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/bus.h>
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#include <sys/eventhandler.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/reboot.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/gpio/gpiobusvar.h>
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struct gpiopower_softc {
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gpio_pin_t sc_pin;
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int sc_rbmask;
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};
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static void gpiopower_assert(device_t dev, int howto);
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static int
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gpiopower_probe(device_t dev)
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{
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if (ofw_bus_is_compatible(dev, "gpio-poweroff")) {
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device_set_desc(dev, "GPIO poweroff control");
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return (0);
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} else if (ofw_bus_is_compatible(dev, "gpio-restart")) {
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device_set_desc(dev, "GPIO restart control");
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return (0);
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}
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return (ENXIO);
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}
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static int
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gpiopower_attach(device_t dev)
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{
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struct gpiopower_softc *sc;
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phandle_t node;
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sc = device_get_softc(dev);
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if ((node = ofw_bus_get_node(dev)) == -1)
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return (ENXIO);
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ofw_gpiobus_parse_gpios(dev, "gpios", &sc->sc_pin);
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if (sc->sc_pin == NULL) {
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device_printf(dev, "failed to map GPIO pin\n");
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return (ENXIO);
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}
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if (ofw_bus_is_compatible(dev, "gpio-poweroff"))
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sc->sc_rbmask = RB_HALT | RB_POWEROFF;
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else
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sc->sc_rbmask = 0;
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EVENTHANDLER_REGISTER(shutdown_final, gpiopower_assert, dev,
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SHUTDOWN_PRI_LAST);
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gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
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return (0);
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}
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static void
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gpiopower_assert(device_t dev, int howto)
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{
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struct gpiopower_softc *sc;
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int do_assert;
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sc = device_get_softc(dev);
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do_assert = sc->sc_rbmask ? (sc->sc_rbmask & howto) :
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((howto & RB_HALT) == 0);
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if (!do_assert)
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return;
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if (howto & RB_POWEROFF)
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device_printf(dev, "powering system off\n");
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else if ((howto & RB_HALT) == 0)
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device_printf(dev, "resetting system\n");
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else
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return;
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gpio_pin_set_active(sc->sc_pin, true);
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/* Wait a second for it to trip */
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DELAY(10000000);
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}
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static devclass_t gpiopower_devclass;
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static device_method_t gpiopower_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gpiopower_probe),
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DEVMETHOD(device_attach, gpiopower_attach),
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DEVMETHOD_END
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};
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static driver_t gpiopower_driver = {
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"gpiopower",
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gpiopower_methods,
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sizeof(struct gpiopower_softc)
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};
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DRIVER_MODULE(gpiopower, simplebus, gpiopower_driver, gpiopower_devclass, 0, 0);
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MODULE_DEPEND(gpiopower, gpiobus, 1, 1, 1);
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