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/* $OpenBSD: gpioleds.c,v 1.3 2021/11/07 16:43:12 kn Exp $ */
/*
* Copyright (c) 2021 Klemens Nanni <kn@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/gpio/gpiovar.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
struct gpioleds_softc {
struct device sc_dev;
int sc_node;
};
int gpioleds_match(struct device *, void *, void *);
void gpioleds_attach(struct device *, struct device *, void *);
struct cfattach gpioleds_ca = {
sizeof (struct gpioleds_softc), gpioleds_match, gpioleds_attach
};
struct cfdriver gpioleds_cd = {
NULL, "gpioleds", DV_DULL
};
int
gpioleds_match(struct device *parent, void *match, void *aux)
{
const struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "gpio-leds");
}
void
gpioleds_attach(struct device *parent, struct device *self, void *aux)
{
struct fdt_attach_args *faa = aux;
uint32_t *led_pin;
char *function, *default_state;
char *function_prop = "function";
int function_len, default_state_len, gpios_len;
int node, leds = 0;
pinctrl_byname(faa->fa_node, "default");
for (node = OF_child(faa->fa_node); node; node = OF_peer(node)) {
function_len = OF_getproplen(node, function_prop);
if (function_len <= 0) {
function_prop = "label";
function_len = OF_getproplen(node, function_prop);
if (function_len <= 0)
continue;
}
default_state_len = OF_getproplen(node, "default-state");
if (default_state_len <= 0)
continue;
gpios_len = OF_getproplen(node, "gpios");
if (gpios_len <= 0)
continue;
function = malloc(function_len, M_TEMP, M_WAITOK);
OF_getprop(node, function_prop, function, function_len);
default_state = malloc(default_state_len, M_TEMP, M_WAITOK);
OF_getprop(node, "default-state", default_state, default_state_len);
led_pin = malloc(gpios_len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "gpios", led_pin, gpios_len);
gpio_controller_config_pin(led_pin, GPIO_CONFIG_OUTPUT);
if (strcmp(default_state, "on") == 0)
gpio_controller_set_pin(led_pin, 1);
else if (strcmp(default_state, "off") == 0)
gpio_controller_set_pin(led_pin, 0);
printf("%s \"%s\"", leds++ ? "," : ":", function);
free(function, M_TEMP, function_len);
free(default_state, M_TEMP, default_state_len);
free(led_pin, M_TEMP, gpios_len);
}
if (leds == 0)
printf(": no LEDs");
printf("\n");
}
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