gpioled.c revision 259036 
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: head/sys/dev/gpio/gpioled.c 259036 2013-12-06 17:56:20Z loos $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bio.h>
33#include <sys/bus.h>
34#include <sys/conf.h>
35#include <sys/kernel.h>
36#include <sys/kthread.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/led/led.h>
43#include <sys/gpio.h>
44#include "gpiobus_if.h"
45
46/*
47 * Only one pin for led
48 */
49#define	GPIOLED_PIN	0
50
51#define GPIOLED_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
52#define	GPIOLED_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
53#define GPIOLED_LOCK_INIT(_sc) \
54	mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
55	    "gpioled", MTX_DEF)
56#define GPIOLED_LOCK_DESTROY(_sc)	mtx_destroy(&_sc->sc_mtx);
57
58struct 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
66static void gpioled_control(void *, int);
67static int gpioled_probe(device_t);
68static int gpioled_attach(device_t);
69static int gpioled_detach(device_t);
70
71static void
72gpioled_control(void *priv, int onoff)
73{
74	struct gpioled_softc *sc = priv;
75	GPIOLED_LOCK(sc);
76	GPIOBUS_LOCK_BUS(sc->sc_busdev);
77	GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev);
78	GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
79	    GPIO_PIN_OUTPUT);
80	GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, GPIOLED_PIN,
81	    onoff ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
82	GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
83	GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
84	GPIOLED_UNLOCK(sc);
85}
86
87static int
88gpioled_probe(device_t dev)
89{
90	device_set_desc(dev, "GPIO led");
91	return (0);
92}
93
94static int
95gpioled_attach(device_t dev)
96{
97	struct gpioled_softc *sc;
98	const char *name;
99
100	sc = device_get_softc(dev);
101	sc->sc_dev = dev;
102	sc->sc_busdev = device_get_parent(dev);
103	GPIOLED_LOCK_INIT(sc);
104	if (resource_string_value(device_get_name(dev),
105	    device_get_unit(dev), "name", &name))
106		name = NULL;
107
108	sc->sc_leddev = led_create(gpioled_control, sc, name ? name :
109	    device_get_nameunit(dev));
110
111	return (0);
112}
113
114static int
115gpioled_detach(device_t dev)
116{
117	struct gpioled_softc *sc;
118
119	sc = device_get_softc(dev);
120	if (sc->sc_leddev) {
121		led_destroy(sc->sc_leddev);
122		sc->sc_leddev = NULL;
123	}
124	GPIOLED_LOCK_DESTROY(sc);
125	return (0);
126}
127
128static devclass_t gpioled_devclass;
129
130static device_method_t gpioled_methods[] = {
131	/* Device interface */
132	DEVMETHOD(device_probe,		gpioled_probe),
133	DEVMETHOD(device_attach,	gpioled_attach),
134	DEVMETHOD(device_detach,	gpioled_detach),
135
136	{ 0, 0 }
137};
138
139static driver_t gpioled_driver = {
140	"gpioled",
141	gpioled_methods,
142	sizeof(struct gpioled_softc),
143};
144
145DRIVER_MODULE(gpioled, gpiobus, gpioled_driver, gpioled_devclass, 0, 0);
146