cambria_led.c revision 302408 
1/*-
2 * Copyright (c) 2008 Sam Leffler.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 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: stable/11/sys/arm/xscale/ixp425/cambria_led.c 194015 2009-06-11 17:05:13Z avg $");
27
28/*
29 * Gateworks Cambria Octal LED Latch driver.
30 */
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/bus.h>
36
37#include <machine/armreg.h>
38
39#include <arm/xscale/ixp425/ixp425reg.h>
40#include <arm/xscale/ixp425/ixp425var.h>
41
42#include <dev/led/led.h>
43
44struct led_softc {
45	device_t		sc_dev;
46	bus_space_tag_t		sc_iot;
47	bus_space_handle_t	sc_ioh;
48	struct cdev		*sc_leds[8];
49	uint8_t			sc_latch;
50};
51
52static void
53update_latch(struct led_softc *sc, int bit, int onoff)
54{
55	if (onoff)
56		sc->sc_latch &= ~bit;
57	else
58		sc->sc_latch |= bit;
59	bus_space_write_1(sc->sc_iot, sc->sc_ioh, 0, sc->sc_latch);
60}
61static void led_A(void *arg, int onoff) { update_latch(arg, 1<<0, onoff); }
62static void led_B(void *arg, int onoff) { update_latch(arg, 1<<1, onoff); }
63static void led_C(void *arg, int onoff) { update_latch(arg, 1<<2, onoff); }
64static void led_D(void *arg, int onoff) { update_latch(arg, 1<<3, onoff); }
65static void led_E(void *arg, int onoff) { update_latch(arg, 1<<4, onoff); }
66static void led_F(void *arg, int onoff) { update_latch(arg, 1<<5, onoff); }
67static void led_G(void *arg, int onoff) { update_latch(arg, 1<<6, onoff); }
68static void led_H(void *arg, int onoff) { update_latch(arg, 1<<7, onoff); }
69
70static int
71led_probe(device_t dev)
72{
73	device_set_desc(dev, "Gateworks Octal LED Latch");
74	return (0);
75}
76
77static int
78led_attach(device_t dev)
79{
80	struct led_softc *sc = device_get_softc(dev);
81	struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
82
83	sc->sc_dev = dev;
84	sc->sc_iot = sa->sc_iot;
85	/* NB: write anywhere works, use first location */
86	if (bus_space_map(sc->sc_iot, CAMBRIA_OCTAL_LED_HWBASE, sizeof(uint8_t),
87	    0, &sc->sc_ioh)) {
88		device_printf(dev, "cannot map LED latch (0x%lx)",
89		    CAMBRIA_OCTAL_LED_HWBASE);
90		return ENXIO;
91	}
92
93	sc->sc_leds[0] = led_create(led_A, sc, "A");
94	sc->sc_leds[1] = led_create(led_B, sc, "B");
95	sc->sc_leds[2] = led_create(led_C, sc, "C");
96	sc->sc_leds[3] = led_create(led_D, sc, "D");
97	sc->sc_leds[4] = led_create(led_E, sc, "E");
98	sc->sc_leds[5] = led_create(led_F, sc, "F");
99	sc->sc_leds[6] = led_create(led_G, sc, "G");
100	sc->sc_leds[7] = led_create(led_H, sc, "H");
101
102	return 0;
103}
104
105static int
106led_detach(device_t dev)
107{
108	struct led_softc *sc = device_get_softc(dev);
109	int i;
110
111	for (i = 0; i < 8; i++) {
112		struct cdev *led = sc->sc_leds[i];
113		if (led != NULL)
114			led_destroy(led);
115	}
116	return (0);
117}
118
119static device_method_t led_methods[] = {
120	DEVMETHOD(device_probe,		led_probe),
121	DEVMETHOD(device_attach,	led_attach),
122	DEVMETHOD(device_detach,	led_detach),
123
124	{0, 0},
125};
126
127static driver_t led_driver = {
128	"led_cambria",
129	led_methods,
130	sizeof(struct led_softc),
131};
132static devclass_t led_devclass;
133DRIVER_MODULE(led_cambria, ixp, led_driver, led_devclass, 0, 0);
134