becc_button.c revision 1.4 
1/*	$NetBSD: becc_button.c,v 1.4 2012/02/12 16:31:01 matt Exp $	*/
2
3/*
4 * Copyright (c) 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed for the NetBSD Project by
20 *	Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 *    or promote products derived from this software without specific prior
23 *    written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * Driver for the reset button on the ADI Engineering, Inc. Big Endian
40 * Companion Chip.
41 *
42 * When pressed for two seconds, the reset button performs a hard reset
43 * of the system.  Shorter presses result in an interrupt being generated,
44 * which the operating system can use to trigger a graceful reboot.
45 */
46
47#include <sys/cdefs.h>
48__KERNEL_RCSID(0, "$NetBSD: becc_button.c,v 1.4 2012/02/12 16:31:01 matt Exp $");
49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/device.h>
53
54#include <arm/xscale/beccreg.h>
55#include <arm/xscale/beccvar.h>
56
57#include <dev/sysmon/sysmonvar.h>
58#include <dev/sysmon/sysmon_taskq.h>
59
60static int beccbut_attached;	/* there can be only one */
61
62struct beccbut_softc {
63	device_t sc_dev;
64	struct sysmon_pswitch sc_smpsw;
65	void *sc_ih;
66};
67
68static void
69beccbut_pressed_event(void *arg)
70{
71	struct beccbut_softc *sc = arg;
72
73	sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
74}
75
76static int
77beccbut_intr(void *arg)
78{
79	struct beccbut_softc *sc = arg;
80	int rv;
81
82	rv = sysmon_task_queue_sched(0, beccbut_pressed_event, sc);
83	if (rv != 0)
84		printf("%s: WARNING: unable to queue button pressed "
85		    "callback: %d\n", device_xname(sc->sc_dev), rv);
86
87	return (1);
88}
89
90static int
91beccbut_match(device_t parent, cfdata_t match, void *aux)
92{
93
94	return (beccbut_attached == 0);
95}
96
97static void
98beccbut_attach(device_t parent, device_t self, void *aux)
99{
100	struct beccbut_softc *sc = device_private(self);
101
102	aprint_normal(": Reset button\n");
103	aprint_naive(": Reset button\n");
104
105	beccbut_attached = 1;
106	sc->sc_dev = self;
107
108	sysmon_task_queue_init();
109
110	sc->sc_smpsw.smpsw_name = device_xname(sc->sc_dev);
111	sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_RESET;
112
113	if (sysmon_pswitch_register(&sc->sc_smpsw) != 0) {
114		aprint_error_dev(sc->sc_dev,
115		    "unable to register with sysmon\n");
116		return;
117	}
118
119	sc->sc_ih = becc_intr_establish(ICU_PUSHBUTTON, IPL_TTY,
120	    beccbut_intr, sc);
121	if (sc->sc_ih == NULL)
122		aprint_error_dev(sc->sc_dev,
123		    "unable to establish interrupt handler\n");
124}
125
126CFATTACH_DECL_NEW(beccbut, sizeof(struct beccbut_softc),
127    beccbut_match, beccbut_attach, NULL, NULL);
128