/*-
 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include "opt_platform.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>

#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>

#include <dev/gpio/gpiobusvar.h>
#include <dev/led/led.h>

#include "gpiobus_if.h"

struct gpioled
{
        struct gpioleds_softc   *parent_sc;
        gpio_pin_t              pin;
        struct cdev             *leddev;
};

struct gpioleds_softc
{
        device_t        sc_dev;
        device_t        sc_busdev;
        struct gpioled  *sc_leds;
        int             sc_total_leds;
};

static void gpioled_control(void *, int);
static int gpioled_probe(device_t);
static int gpioled_attach(device_t);
static int gpioled_detach(device_t);

static void
gpioled_control(void *priv, int onoff)
{
        struct gpioled *led;

        led = (struct gpioled *)priv;
        if (led->pin)
                gpio_pin_set_active(led->pin, onoff);
}

static void
gpioleds_attach_led(struct gpioleds_softc *sc, phandle_t node,
    struct gpioled *led)
{
        char *name;
        int state, err;
        char *default_state;

        led->parent_sc = sc;

        state = 0;
        if (OF_getprop_alloc(node, "default-state",
            (void **)&default_state) != -1) {
                if (strcasecmp(default_state, "on") == 0)
                        state = 1;
                else if (strcasecmp(default_state, "off") == 0)
                        state = 0;
                else if (strcasecmp(default_state, "keep") == 0)
                        state = -1;
                else {
                        state = -1;
                        device_printf(sc->sc_dev,
                            "unknown value for default-state in FDT\n");
                }
                OF_prop_free(default_state);
        }

        name = NULL;
        if (OF_getprop_alloc(node, "label", (void **)&name) == -1)
                OF_getprop_alloc(node, "name", (void **)&name);

        if (name == NULL) {
                device_printf(sc->sc_dev,
                    "no name provided for gpio LED, skipping\n");
                return;
        }

        err = gpio_pin_get_by_ofw_idx(sc->sc_dev, node, 0, &led->pin);
        if (err) {
                device_printf(sc->sc_dev, "<%s> failed to map pin\n", name);
                if (name)
                        OF_prop_free(name);
                return;
        }
        gpio_pin_setflags(led->pin, GPIO_PIN_OUTPUT);

        led->leddev = led_create_state(gpioled_control, led, name,
            state);

        if (name != NULL)
                OF_prop_free(name);
}

static void
gpioleds_detach_led(struct gpioled *led)
{

        if (led->leddev != NULL)
                led_destroy(led->leddev);

        if (led->pin)
                gpio_pin_release(led->pin);
}

static int
gpioled_probe(device_t dev)
{
        if (!ofw_bus_status_okay(dev))
                return (ENXIO);
        if (!ofw_bus_is_compatible(dev, "gpio-leds"))
                return (ENXIO);

        device_set_desc(dev, "GPIO LEDs");

        return (BUS_PROBE_DEFAULT);
}

static int
gpioled_attach(device_t dev)
{
        struct gpioleds_softc *sc;
        phandle_t child, leds;
        int total_leds;

        if ((leds = ofw_bus_get_node(dev)) == -1)
                return (ENXIO);

        sc = device_get_softc(dev);
        sc->sc_dev = dev;
        sc->sc_busdev = device_get_parent(dev);

        /* Traverse the 'gpio-leds' node and count leds */
        total_leds = 0;
        for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
                if (!OF_hasprop(child, "gpios"))
                        continue;
                total_leds++;
        }

        if (total_leds) {
                sc->sc_leds =  malloc(sizeof(struct gpioled) * total_leds,
                    M_DEVBUF, M_WAITOK | M_ZERO);

                sc->sc_total_leds = 0;
                /* Traverse the 'gpio-leds' node and count leds */
                for (child = OF_child(leds); child != 0; child = OF_peer(child)) {
                        if (!OF_hasprop(child, "gpios"))
                                continue;
                        gpioleds_attach_led(sc, child, &sc->sc_leds[sc->sc_total_leds]);
                        sc->sc_total_leds++;
                }
        }

        return (0);
}

static int
gpioled_detach(device_t dev)
{
        struct gpioleds_softc *sc;
        int i;

        sc = device_get_softc(dev);

        for (i = 0; i < sc->sc_total_leds; i++)
                gpioleds_detach_led(&sc->sc_leds[i]);

        if (sc->sc_leds)
                free(sc->sc_leds, M_DEVBUF);

        return (0);
}

static device_method_t gpioled_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         gpioled_probe),
        DEVMETHOD(device_attach,        gpioled_attach),
        DEVMETHOD(device_detach,        gpioled_detach),

        DEVMETHOD_END
};

static driver_t gpioled_driver = {
        "gpioled",
        gpioled_methods,
        sizeof(struct gpioleds_softc),
};

DRIVER_MODULE(gpioled, ofwbus, gpioled_driver, 0, 0);
DRIVER_MODULE(gpioled, simplebus, gpioled_driver, 0, 0);
MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);