1 /*-
2 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, 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 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_platform.h"
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/bus.h>
35 #include <sys/gpio.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41
42 #include <dev/gpio/gpiobusvar.h>
43 #include <dev/led/led.h>
44
45 #include "gpiobus_if.h"
46
47 /*
48 * Only one pin for led
49 */
50 #define GPIOLED_PIN 0
51
52 #define GPIOLED_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
53 #define GPIOLED_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
54 #define GPIOLED_LOCK_INIT(_sc) mtx_init(&(_sc)->sc_mtx, \
55 device_get_nameunit((_sc)->sc_dev), "gpioled", MTX_DEF)
56 #define GPIOLED_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
57
58 struct gpioled_softc
59 {
60 device_t sc_dev;
61 device_t sc_busdev;
62 struct mtx sc_mtx;
63 struct cdev *sc_leddev;
64 };
65
66 static void gpioled_control(void *, int);
67 static int gpioled_probe(device_t);
68 static int gpioled_attach(device_t);
69 static int gpioled_detach(device_t);
70
71 static void
gpioled_control(void * priv,int onoff)72 gpioled_control(void *priv, int onoff)
73 {
74 struct gpioled_softc *sc;
75
76 sc = (struct gpioled_softc *)priv;
77 GPIOLED_LOCK(sc);
78 if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
79 GPIO_PIN_OUTPUT) == 0) {
80 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
81 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
82 }
83 GPIOLED_UNLOCK(sc);
84 }
85
86 static int
gpioled_probe(device_t dev)87 gpioled_probe(device_t dev)
88 {
89 device_set_desc(dev, "GPIO led");
90
91 return (BUS_PROBE_DEFAULT);
92 }
93
94 static int
gpioled_attach(device_t dev)95 gpioled_attach(device_t dev)
96 {
97 struct gpioled_softc *sc;
98 int state;
99 const char *name;
100
101 sc = device_get_softc(dev);
102 sc->sc_dev = dev;
103 sc->sc_busdev = device_get_parent(dev);
104 GPIOLED_LOCK_INIT(sc);
105
106 state = 0;
107
108 if (resource_string_value(device_get_name(dev),
109 device_get_unit(dev), "name", &name))
110 name = NULL;
111 resource_int_value(device_get_name(dev),
112 device_get_unit(dev), "state", &state);
113
114 sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
115 device_get_nameunit(dev), state);
116
117 return (0);
118 }
119
120 static int
gpioled_detach(device_t dev)121 gpioled_detach(device_t dev)
122 {
123 struct gpioled_softc *sc;
124
125 sc = device_get_softc(dev);
126 if (sc->sc_leddev) {
127 led_destroy(sc->sc_leddev);
128 sc->sc_leddev = NULL;
129 }
130 GPIOLED_LOCK_DESTROY(sc);
131 return (0);
132 }
133
134 static devclass_t gpioled_devclass;
135
136 static device_method_t gpioled_methods[] = {
137 /* Device interface */
138 DEVMETHOD(device_probe, gpioled_probe),
139 DEVMETHOD(device_attach, gpioled_attach),
140 DEVMETHOD(device_detach, gpioled_detach),
141
142 DEVMETHOD_END
143 };
144
145 static driver_t gpioled_driver = {
146 "gpioled",
147 gpioled_methods,
148 sizeof(struct gpioled_softc),
149 };
150
151 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
152 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
153 MODULE_VERSION(gpioled, 1);
154