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/param.h>
29 #include <sys/systm.h>
30 #include <sys/module.h>
31 #include <sys/bus.h>
32 #include <sys/conf.h>
33 #include <sys/kernel.h>
34
35 #include <dev/ofw/ofw_bus.h>
36 #include <dev/ofw/openfirm.h>
37 #include <dev/led/led.h>
38
39 #include "gpio_if.h"
40
41 struct rbled_softc {
42 struct cdev *sc_led;
43 device_t sc_gpio;
44 uint32_t sc_ledpin;
45 };
46
47 static int rbled_probe(device_t);
48 static int rbled_attach(device_t);
49 static int rbled_detach(device_t);
50 static void rbled_toggle(void *, int);
51
52 static device_method_t rbled_methods[] = {
53 /* Device interface */
54 DEVMETHOD(device_probe, rbled_probe),
55 DEVMETHOD(device_attach, rbled_attach),
56 DEVMETHOD(device_detach, rbled_detach),
57
58 DEVMETHOD_END
59 };
60
61 static driver_t rbled_driver = {
62 "rbled",
63 rbled_methods,
64 sizeof(struct rbled_softc),
65 };
66
67 DRIVER_MODULE(rbled, simplebus, rbled_driver, 0, 0);
68
69 static int
rbled_probe(device_t dev)70 rbled_probe(device_t dev)
71 {
72 phandle_t node;
73 const char *name;
74 cell_t gp[2];
75 char model[6];
76
77 node = ofw_bus_get_node(dev);
78
79 name = ofw_bus_get_name(dev);
80 if (name == NULL)
81 return (ENXIO);
82 if (strcmp(name, "led") != 0)
83 return (ENXIO);
84
85 if (OF_getprop(node, "user_led", gp, sizeof(gp)) <= 0)
86 return (ENXIO);
87
88 /* Check root model. */
89 node = OF_peer(0);
90 if (OF_getprop(node, "model", model, sizeof(model)) <= 0)
91 return (ENXIO);
92 if (strcmp(model, "RB800") != 0)
93 return (ENXIO);
94
95 device_set_desc(dev, "RouterBoard LED");
96 return (0);
97 }
98
99 static int
rbled_attach(device_t dev)100 rbled_attach(device_t dev)
101 {
102 struct rbled_softc *sc;
103 phandle_t node;
104 cell_t gp[2];
105
106 sc = device_get_softc(dev);
107 node = ofw_bus_get_node(dev);
108
109 if (OF_getprop(node, "user_led", gp, sizeof(gp)) <= 0)
110 return (ENXIO);
111
112 sc->sc_gpio = OF_device_from_xref(gp[0]);
113 if (sc->sc_gpio == NULL) {
114 device_printf(dev, "No GPIO resource found!\n");
115 return (ENXIO);
116 }
117 sc->sc_ledpin = gp[1];
118
119 sc->sc_led = led_create(rbled_toggle, sc, "user_led");
120
121 if (sc->sc_led == NULL)
122 return (ENXIO);
123
124 return (0);
125 }
126
127 static int
rbled_detach(device_t dev)128 rbled_detach(device_t dev)
129 {
130 struct rbled_softc *sc;
131
132 sc = device_get_softc(dev);
133 led_destroy(sc->sc_led);
134
135 return (0);
136 }
137
138 static void
rbled_toggle(void * priv,int onoff)139 rbled_toggle(void *priv, int onoff)
140 {
141 struct rbled_softc *sc = priv;
142
143 GPIO_PIN_SET(sc->sc_gpio, sc->sc_ledpin, onoff);
144 }
145