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      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 
     60 static int beccbut_attached;	/* there can be only one */
     61 
     62 struct beccbut_softc {
     63 	device_t 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", device_xname(sc->sc_dev), rv);
     86 
     87 	return (1);
     88 }
     89 
     90 static int
     91 beccbut_match(device_t parent, cfdata_t match, void *aux)
     92 {
     93 
     94 	return (beccbut_attached == 0);
     95 }
     96 
     97 static void
     98 beccbut_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 
    126 CFATTACH_DECL_NEW(beccbut, sizeof(struct beccbut_softc),
    127     beccbut_match, beccbut_attach, NULL, NULL);
    128