1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
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 int sc_invert;
65 };
66
67 static void gpioled_control(void *, int);
68 static int gpioled_probe(device_t);
69 static int gpioled_attach(device_t);
70 static int gpioled_detach(device_t);
71
72 static void
gpioled_control(void * priv,int onoff)73 gpioled_control(void *priv, int onoff)
74 {
75 struct gpioled_softc *sc;
76
77 sc = (struct gpioled_softc *)priv;
78 GPIOLED_LOCK(sc);
79 if (GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
80 GPIO_PIN_OUTPUT) == 0) {
81 if (sc->sc_invert)
82 onoff = !onoff;
83 GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
84 onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
85 }
86 GPIOLED_UNLOCK(sc);
87 }
88
89 static int
gpioled_probe(device_t dev)90 gpioled_probe(device_t dev)
91 {
92 device_set_desc(dev, "GPIO led");
93
94 return (BUS_PROBE_DEFAULT);
95 }
96
97 static int
gpioled_attach(device_t dev)98 gpioled_attach(device_t dev)
99 {
100 struct gpioled_softc *sc;
101 int state;
102 const char *name;
103
104 sc = device_get_softc(dev);
105 sc->sc_dev = dev;
106 sc->sc_busdev = device_get_parent(dev);
107 GPIOLED_LOCK_INIT(sc);
108
109 state = 0;
110
111 if (resource_string_value(device_get_name(dev),
112 device_get_unit(dev), "name", &name))
113 name = NULL;
114 resource_int_value(device_get_name(dev),
115 device_get_unit(dev), "invert", &sc->sc_invert);
116 resource_int_value(device_get_name(dev),
117 device_get_unit(dev), "state", &state);
118
119 sc->sc_leddev = led_create_state(gpioled_control, sc, name ? name :
120 device_get_nameunit(dev), state);
121
122 return (0);
123 }
124
125 static int
gpioled_detach(device_t dev)126 gpioled_detach(device_t dev)
127 {
128 struct gpioled_softc *sc;
129
130 sc = device_get_softc(dev);
131 if (sc->sc_leddev) {
132 led_destroy(sc->sc_leddev);
133 sc->sc_leddev = NULL;
134 }
135 GPIOLED_LOCK_DESTROY(sc);
136 return (0);
137 }
138
139 static device_method_t gpioled_methods[] = {
140 /* Device interface */
141 DEVMETHOD(device_probe, gpioled_probe),
142 DEVMETHOD(device_attach, gpioled_attach),
143 DEVMETHOD(device_detach, gpioled_detach),
144
145 DEVMETHOD_END
146 };
147
148 static driver_t gpioled_driver = {
149 "gpioled",
150 gpioled_methods,
151 sizeof(struct gpioled_softc),
152 };
153
154 DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, 0, 0);
155 MODULE_DEPEND(gpioled, gpiobus, 1, 1, 1);
156 MODULE_VERSION(gpioled, 1);
157