1/*-
2 * Copyright (c) 2017 Justin Hibbits
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35#include <sys/conf.h>
36#include <sys/kernel.h>
37
38#include <dev/ofw/ofw_bus.h>
39#include <dev/ofw/openfirm.h>
40#include <dev/led/led.h>
41
42#include "gpio_if.h"
43
44struct rbled_softc {
45	struct cdev	*sc_led;
46	device_t	 sc_gpio;
47	uint32_t	 sc_ledpin;
48};
49
50static int	rbled_probe(device_t);
51static int	rbled_attach(device_t);
52static int	rbled_detach(device_t);
53static void	rbled_toggle(void *, int);
54
55static device_method_t  rbled_methods[] = {
56	/* Device interface */
57	DEVMETHOD(device_probe,		rbled_probe),
58	DEVMETHOD(device_attach,	rbled_attach),
59        DEVMETHOD(device_detach,        rbled_detach),
60
61	DEVMETHOD_END
62};
63
64static driver_t rbled_driver = {
65	"rbled",
66	rbled_methods,
67	sizeof(struct rbled_softc),
68};
69
70static devclass_t rbled_devclass;
71
72DRIVER_MODULE(rbled, simplebus, rbled_driver, rbled_devclass, 0, 0);
73
74static int
75rbled_probe(device_t dev)
76{
77	phandle_t node;
78	const char *name;
79	cell_t gp[2];
80	char model[6];
81
82	node = ofw_bus_get_node(dev);
83
84	name = ofw_bus_get_name(dev);
85	if (name == NULL)
86		return (ENXIO);
87	if (strcmp(name, "led") != 0)
88		return (ENXIO);
89
90	if (OF_getprop(node, "user_led", gp, sizeof(gp)) <= 0)
91		return (ENXIO);
92
93	/* Check root model. */
94	node = OF_peer(0);
95	if (OF_getprop(node, "model", model, sizeof(model)) <= 0)
96		return (ENXIO);
97	if (strcmp(model, "RB800") != 0)
98		return (ENXIO);
99
100	device_set_desc(dev, "RouterBoard LED");
101	return (0);
102}
103
104static int
105rbled_attach(device_t dev)
106{
107	struct rbled_softc *sc;
108	phandle_t node;
109	cell_t gp[2];
110
111	sc = device_get_softc(dev);
112	node = ofw_bus_get_node(dev);
113
114	if (OF_getprop(node, "user_led", gp, sizeof(gp)) <= 0)
115		return (ENXIO);
116
117	sc->sc_gpio = OF_device_from_xref(gp[0]);
118	if (sc->sc_gpio == NULL) {
119		device_printf(dev, "No GPIO resource found!\n");
120		return (ENXIO);
121	}
122	sc->sc_ledpin = gp[1];
123
124	sc->sc_led = led_create(rbled_toggle, sc, "user_led");
125
126	if (sc->sc_led == NULL)
127		return (ENXIO);
128
129	return (0);
130}
131
132static int
133rbled_detach(device_t dev)
134{
135	struct rbled_softc *sc;
136
137	sc = device_get_softc(dev);
138	led_destroy(sc->sc_led);
139
140	return (0);
141}
142
143static void
144rbled_toggle(void *priv, int onoff)
145{
146	struct rbled_softc *sc = priv;
147
148	GPIO_PIN_SET(sc->sc_gpio, sc->sc_ledpin, onoff);
149}
150