168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*-
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* Copyright (c) 2015-2016 Oleksandr Tymoshenko <gonzo@freebsd.org>
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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#include "opt_platform.h"
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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/gpio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <dev/fdt/fdt_common.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 gpiobacklight_softc
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{
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gpio_pin_t sc_pin;
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struct sysctl_oid *sc_oid;
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bool sc_brightness;
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};
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static int gpiobacklight_sysctl(SYSCTL_HANDLER_ARGS);
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static void gpiobacklight_update_brightness(struct gpiobacklight_softc *);
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static int gpiobacklight_probe(device_t);
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static int gpiobacklight_attach(device_t);
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static int gpiobacklight_detach(device_t);
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static void
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gpiobacklight_update_brightness(struct gpiobacklight_softc *sc)
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{
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if (sc->sc_pin)
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gpio_pin_set_active(sc->sc_pin, sc->sc_brightness);
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}
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static int
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gpiobacklight_sysctl(SYSCTL_HANDLER_ARGS)
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{
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struct gpiobacklight_softc *sc;
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int error;
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int brightness;
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sc = (struct gpiobacklight_softc*)arg1;
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brightness = sc->sc_brightness;
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error = sysctl_handle_int(oidp, &brightness, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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sc->sc_brightness = (brightness > 0);
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gpiobacklight_update_brightness(sc);
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return (0);
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}
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static int
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gpiobacklight_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "gpio-backlight"))
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return (ENXIO);
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device_set_desc(dev, "GPIO backlight");
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return (0);
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}
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static int
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gpiobacklight_attach(device_t dev)
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{
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struct gpiobacklight_softc *sc;
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struct sysctl_ctx_list *ctx;
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struct sysctl_oid *tree;
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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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if (OF_hasprop(node, "default-on"))
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sc->sc_brightness = true;
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else
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sc->sc_brightness = false;
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gpio_pin_get_by_ofw_idx(dev, node, 0, &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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gpio_pin_setflags(sc->sc_pin, GPIO_PIN_OUTPUT);
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gpiobacklight_update_brightness(sc);
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/* Init backlight interface */
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ctx = device_get_sysctl_ctx(dev);
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tree = device_get_sysctl_tree(dev);
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sc->sc_oid = SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
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"brightness", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, sc, 0,
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gpiobacklight_sysctl, "I", "backlight brightness");
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return (0);
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}
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static int
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gpiobacklight_detach(device_t dev)
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{
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struct gpiobacklight_softc *sc;
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sc = device_get_softc(dev);
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if (sc->sc_pin)
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gpio_pin_release(sc->sc_pin);
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return (0);
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}
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static device_method_t gpiobacklight_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, gpiobacklight_probe),
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DEVMETHOD(device_attach, gpiobacklight_attach),
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DEVMETHOD(device_detach, gpiobacklight_detach),
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DEVMETHOD_END
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};
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static driver_t gpiobacklight_driver = {
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"gpiobacklight",
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gpiobacklight_methods,
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sizeof(struct gpiobacklight_softc),
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};
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DRIVER_MODULE(gpiobacklight, simplebus, gpiobacklight_driver, 0, 0);
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MODULE_DEPEND(gpiobacklight, gpiobus, 1, 1, 1);
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