cambria_fled.c revision 186011 
1169695Skan/*-
2169695Skan * Copyright (c) 2008 Sam Leffler.  All rights reserved.
3169695Skan *
4169695Skan * Redistribution and use in source and binary forms, with or without
5169695Skan * modification, are permitted provided that the following conditions
6169695Skan * are met:
7169695Skan * 1. Redistributions of source code must retain the above copyright
8169695Skan *    notice, this list of conditions and the following disclaimer.
9169695Skan * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD: projects/cambria/sys/arm/xscale/ixp425/cambria_fled.c 186011 2008-12-13 01:21:37Z sam $");
27/*
28 * Cambria Front Panel LED sitting on the I2C bus.
29 */
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/bus.h>
35
36#include <machine/bus.h>
37
38#include <dev/iicbus/iiconf.h>
39#include <dev/led/led.h>
40
41#include "iicbus_if.h"
42
43#define	IIC_M_WR	0	/* write operation */
44#define	LED_ADDR	0xae	/* slave address */
45
46struct fled_softc {
47	struct cdev	*sc_led;
48};
49
50static int
51fled_probe(device_t dev)
52{
53	device_set_desc(dev, "Gateworks Cambria Front Panel LED");
54	return 0;
55}
56
57static void
58fled_cb(void *arg, int onoff)
59{
60	uint8_t data[1];
61	struct iic_msg msgs[1] = {
62	     { LED_ADDR, IIC_M_WR, 1, data },
63	};
64	device_t dev = arg;
65
66	data[0] = (onoff == 0);		/* NB: low true */
67	(void) iicbus_transfer(dev, msgs, 1);
68}
69
70static int
71fled_attach(device_t dev)
72{
73	struct fled_softc *sc = device_get_softc(dev);
74
75	sc->sc_led = led_create(fled_cb, dev, "front");
76
77	return 0;
78}
79
80static int
81fled_detach(device_t dev)
82{
83	struct fled_softc *sc = device_get_softc(dev);
84
85	if (sc->sc_led != NULL)
86		led_destroy(sc->sc_led);
87
88	return 0;
89}
90
91static device_method_t fled_methods[] = {
92	DEVMETHOD(device_probe,		fled_probe),
93	DEVMETHOD(device_attach,	fled_attach),
94	DEVMETHOD(device_detach,	fled_detach),
95
96	{0, 0},
97};
98
99static driver_t fled_driver = {
100	"fled",
101	fled_methods,
102	sizeof(struct fled_softc),
103};
104static devclass_t fled_devclass;
105
106DRIVER_MODULE(fled, iicbus, fled_driver, fled_devclass, 0, 0);
107MODULE_VERSION(fled, 1);
108MODULE_DEPEND(fled, iicbus, 1, 1, 1);
109