sys/arch/arm/xscale/becc_button.c

   1 /*      $NetBSD: becc_button.c,v 1.1.2.3 2004/09/21 13:13:42 skrll 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 1.1.2.3 2004/09/21 13:13:42 skrll 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
  60 static int beccbut_attached;    /* there can be only one */
  61
  62 struct beccbut_softc {
  63         struct device sc_dev;
  64         struct sysmon_pswitch sc_smpsw;
  65         void *sc_ih;
  66 };
  67
  68 static void
  69 beccbut_pressed_event(void *arg)
  70 {
  71         struct beccbut_softc *sc = arg;
  72
  73         sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
  74 }
  75
  76 static int
  77 beccbut_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", sc->sc_dev.dv_xname, rv);
  86
  87         return (1);
  88 }
  89
  90 static int
  91 beccbut_match(struct device *parent, struct cfdata *match, void *aux)
  92 {
  93
  94         return (beccbut_attached == 0);
  95 }
  96
  97 static void
  98 beccbut_attach(struct device *parent, struct device *self, void *aux)
  99 {
 100         struct beccbut_softc *sc = (void *) self;
 101
 102         printf(": Reset button\n");
 103
 104         beccbut_attached = 1;
 105
 106         sysmon_task_queue_init();
 107
 108         sc->sc_smpsw.smpsw_name = sc->sc_dev.dv_xname;
 109         sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_RESET;
 110
 111         if (sysmon_pswitch_register(&sc->sc_smpsw) != 0) {
 112                 printf("%s: unable to register with sysmon\n",
 113                     sc->sc_dev.dv_xname);
 114                 return;
 115         }
 116
 117         sc->sc_ih = becc_intr_establish(ICU_PUSHBUTTON, IPL_TTY,
 118             beccbut_intr, sc);
 119         if (sc->sc_ih == NULL)
 120                 printf("%s: unable to establish interrupt handler\n",
 121                     sc->sc_dev.dv_xname);
 122 }
 123
 124 CFATTACH_DECL(beccbut, sizeof(struct beccbut_softc),
 125     beccbut_match, beccbut_attach, NULL, NULL);