1/* $OpenBSD: gpioleds.c,v 1.4 2022/04/06 18:59:28 naddy Exp $ */ 2/* 3 * Copyright (c) 2021 Klemens Nanni <kn@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#include <sys/param.h> 19#include <sys/systm.h> 20#include <sys/device.h> 21#include <sys/gpio.h> 22#include <sys/malloc.h> 23 24#include <machine/bus.h> 25#include <machine/fdt.h> 26 27#include <dev/gpio/gpiovar.h> 28#include <dev/ofw/ofw_gpio.h> 29#include <dev/ofw/ofw_pinctrl.h> 30#include <dev/ofw/openfirm.h> 31#include <dev/ofw/fdt.h> 32 33struct gpioleds_softc { 34 struct device sc_dev; 35 int sc_node; 36}; 37 38int gpioleds_match(struct device *, void *, void *); 39void gpioleds_attach(struct device *, struct device *, void *); 40 41const struct cfattach gpioleds_ca = { 42 sizeof (struct gpioleds_softc), gpioleds_match, gpioleds_attach 43}; 44 45struct cfdriver gpioleds_cd = { 46 NULL, "gpioleds", DV_DULL 47}; 48 49int 50gpioleds_match(struct device *parent, void *match, void *aux) 51{ 52 const struct fdt_attach_args *faa = aux; 53 54 return OF_is_compatible(faa->fa_node, "gpio-leds"); 55} 56 57void 58gpioleds_attach(struct device *parent, struct device *self, void *aux) 59{ 60 struct fdt_attach_args *faa = aux; 61 uint32_t *led_pin; 62 char *function, *default_state; 63 char *function_prop = "function"; 64 int function_len, default_state_len, gpios_len; 65 int node, leds = 0; 66 67 pinctrl_byname(faa->fa_node, "default"); 68 69 for (node = OF_child(faa->fa_node); node; node = OF_peer(node)) { 70 function_len = OF_getproplen(node, function_prop); 71 if (function_len <= 0) { 72 function_prop = "label"; 73 function_len = OF_getproplen(node, function_prop); 74 if (function_len <= 0) 75 continue; 76 } 77 default_state_len = OF_getproplen(node, "default-state"); 78 if (default_state_len <= 0) 79 continue; 80 gpios_len = OF_getproplen(node, "gpios"); 81 if (gpios_len <= 0) 82 continue; 83 84 function = malloc(function_len, M_TEMP, M_WAITOK); 85 OF_getprop(node, function_prop, function, function_len); 86 default_state = malloc(default_state_len, M_TEMP, M_WAITOK); 87 OF_getprop(node, "default-state", default_state, default_state_len); 88 led_pin = malloc(gpios_len, M_TEMP, M_WAITOK); 89 OF_getpropintarray(node, "gpios", led_pin, gpios_len); 90 gpio_controller_config_pin(led_pin, GPIO_CONFIG_OUTPUT); 91 if (strcmp(default_state, "on") == 0) 92 gpio_controller_set_pin(led_pin, 1); 93 else if (strcmp(default_state, "off") == 0) 94 gpio_controller_set_pin(led_pin, 0); 95 96 printf("%s \"%s\"", leds++ ? "," : ":", function); 97 free(function, M_TEMP, function_len); 98 free(default_state, M_TEMP, default_state_len); 99 free(led_pin, M_TEMP, gpios_len); 100 } 101 102 if (leds == 0) 103 printf(": no LEDs"); 104 printf("\n"); 105} 106