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/*-
* 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>
__FBSDID("$FreeBSD$");
#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",
sizeof(char), (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", 1, (void **)&name) == -1)
OF_getprop_alloc(node, "name", 1, (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_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 devclass_t gpioled_devclass;
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, gpioled_devclass, 0, 0);
DRIVER_MODULE(gpioled, simplebus, gpioled_driver, gpioled_devclass, 0, 0);
MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
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