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
33 struct gpioleds_softc {
34 struct device sc_dev;
35 int sc_node;
36 };
37
38 int gpioleds_match(struct device *, void *, void *);
39 void gpioleds_attach(struct device *, struct device *, void *);
40
41 const struct cfattach gpioleds_ca = {
42 sizeof (struct gpioleds_softc), gpioleds_match, gpioleds_attach
43 };
44
45 struct cfdriver gpioleds_cd = {
46 NULL, "gpioleds", DV_DULL
47 };
48
49 int
gpioleds_match(struct device * parent,void * match,void * aux)50 gpioleds_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
57 void
gpioleds_attach(struct device * parent,struct device * self,void * aux)58 gpioleds_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