path: root/sys/isa/psm.c

/*-
 * Copyright (c) 1992, 1993 Erik Forsberg.
 * Copyright (c) 1996, 1997 Kazutaka YOKOTA.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL I BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 *  Ported to 386bsd Oct 17, 1992
 *  Sandi Donno, Computer Science, University of Cape Town, South Africa
 *  Please send bug reports to sandi@cs.uct.ac.za
 *
 *  Thanks are also due to Rick Macklem, rick@snowhite.cis.uoguelph.ca -
 *  although I was only partially successful in getting the alpha release
 *  of his "driver for the Logitech and ATI Inport Bus mice for use with
 *  386bsd and the X386 port" to work with my Microsoft mouse, I nevertheless
 *  found his code to be an invaluable reference when porting this driver
 *  to 386bsd.
 *
 *  Further modifications for latest 386BSD+patchkit and port to NetBSD,
 *  Andrew Herbert <andrew@werple.apana.org.au> - 8 June 1993
 *
 *  Cloned from the Microsoft Bus Mouse driver, also by Erik Forsberg, by
 *  Andrew Herbert - 12 June 1993
 *
 *  Modified for PS/2 mouse by Charles Hannum <mycroft@ai.mit.edu>
 *  - 13 June 1993
 *
 *  Modified for PS/2 AUX mouse by Shoji Yuen <yuen@nuie.nagoya-u.ac.jp>
 *  - 24 October 1993
 *
 *  Hardware access routines and probe logic rewritten by
 *  Kazutaka Yokota <yokota@zodiac.mech.utsunomiya-u.ac.jp>
 *  - 3, 14, 22 October 1996.
 *  - 12 November 1996. IOCTLs and rearranging `psmread', `psmioctl'...
 *  - 14, 30 November 1996. Uses `kbdio.c'.
 *  - 13 December 1996. Uses queuing version of `kbdio.c'.
 *  - January/February 1997. Tweaked probe logic for 
 *    HiNote UltraII/Latitude/Armada laptops.
 *  - 30 July 1997. Added APM support.
 *  - 5 March 1997. Defined driver configuration flags (PSM_CONFIG_XXX). 
 *    Improved sync check logic.
 *    Vendor specific support routines.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_psm.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/poll.h>
#include <sys/syslog.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/uio.h>

#include <sys/limits.h>
#include <sys/mouse.h>
#include <machine/resource.h>

#include <isa/isavar.h>
#include <dev/kbd/atkbdcreg.h>

/*
 * Driver specific options: the following options may be set by
 * `options' statements in the kernel configuration file.
 */

/* debugging */
#ifndef PSM_DEBUG
#define PSM_DEBUG	0	/*
				 * logging: 0: none, 1: brief, 2: verbose
				 *          3: sync errors, 4: all packets
				 */
#endif
#define VLOG(level, args) 	\
do {				\
	if (verbose >= level)	\
		log args;	\
} while (0)

#ifndef PSM_INPUT_TIMEOUT
#define PSM_INPUT_TIMEOUT	2000000	/* 2 sec */
#endif

#ifndef PSM_TAP_TIMEOUT
#define PSM_TAP_TIMEOUT		125000
#endif

#ifndef PSM_TAP_THRESHOLD
#define PSM_TAP_THRESHOLD	25
#endif

/* end of driver specific options */

#define PSM_DRIVER_NAME		"psm"
#define PSMCPNP_DRIVER_NAME	"psmcpnp"

/* input queue */
#define PSM_BUFSIZE		960
#define PSM_SMALLBUFSIZE	240

/* operation levels */
#define PSM_LEVEL_BASE		0
#define PSM_LEVEL_STANDARD	1
#define PSM_LEVEL_NATIVE	2
#define PSM_LEVEL_MIN		PSM_LEVEL_BASE
#define PSM_LEVEL_MAX		PSM_LEVEL_NATIVE

/* Logitech PS2++ protocol */
#define MOUSE_PS2PLUS_CHECKBITS(b)	\
				((((b[2] & 0x03) << 2) | 0x02) == (b[1] & 0x0f))
#define MOUSE_PS2PLUS_PACKET_TYPE(b)	\
				(((b[0] & 0x30) >> 2) | ((b[1] & 0x30) >> 4))

/* some macros */
#define PSM_UNIT(dev)		(minor(dev) >> 1)
#define PSM_NBLOCKIO(dev)	(minor(dev) & 1)
#define PSM_MKMINOR(unit,block)	(((unit) << 1) | ((block) ? 0:1))

/* ring buffer */
typedef struct ringbuf {
    int           count;	/* # of valid elements in the buffer */
    int           head;		/* head pointer */
    int           tail;		/* tail poiner */
    unsigned char buf[PSM_BUFSIZE];
} ringbuf_t;

/* data buffer */
typedef struct packetbuf {
    unsigned char ipacket[16];	/* interim input buffer */
    int           inputbytes;	/* # of bytes in the input buffer */
} packetbuf_t;

#ifndef PSM_PACKETQUEUE
#define PSM_PACKETQUEUE	128
#endif

typedef struct synapticsinfo {
    struct sysctl_ctx_list	sysctl_ctx;
    struct sysctl_oid		*sysctl_tree;
    int				directional_scrolls; 
    int				low_speed_threshold; 
    int				min_movement; 
    int				squelch_level; 
} synapticsinfo_t;

/* driver control block */
struct psm_softc {		/* Driver status information */
    int		  unit;
    struct selinfo rsel;	/* Process selecting for Input */
    unsigned char state;	/* Mouse driver state */
    int           config;	/* driver configuration flags */
    int           flags;	/* other flags */
    KBDC          kbdc;		/* handle to access the keyboard controller */
    struct resource *intr;	/* IRQ resource */
    void	  *ih;		/* interrupt handle */
    mousehw_t     hw;		/* hardware information */
    synapticshw_t synhw;	/* Synaptics-specific hardware information */
    synapticsinfo_t syninfo;	/* Synaptics-specific configuration */
    mousemode_t   mode;		/* operation mode */
    mousemode_t   dflt_mode;	/* default operation mode */
    mousestatus_t status;	/* accumulated mouse movement */
    ringbuf_t     queue;	/* mouse status queue */
    packetbuf_t   pqueue[PSM_PACKETQUEUE];	/* mouse data queue */
    int           pqueue_start; /* start of data in queue */
    int           pqueue_end;   /* end of data in queue */
    int           button;	/* the latest button state */
    int		  xold;		/* previous absolute X position */
    int		  yold;		/* previous absolute Y position */
    int		  xaverage;	/* average X position */
    int		  yaverage;	/* average Y position */
    int		  squelch;	/* level to filter movement data at low speed */
    int		  zmax;		/* maximum pressure value for touchpads */
    int		  syncerrors;	/* # of bytes discarded searching for sync */
    int		  pkterrors;	/* # of packets failed during quaranteen. */
    struct timeval inputtimeout;
    struct timeval lastsoftintr;	/* time of last soft interrupt */
    struct timeval lastinputerr;	/* time last sync error happened */
    struct timeval taptimeout;		/* tap timeout for touchpads */
    int		  watchdog;		/* watchdog timer flag */
    struct callout_handle callout;	/* watchdog timer call out */
    struct callout_handle softcallout;	/* buffer timer call out */
    struct cdev *dev;
    struct cdev *bdev;
    int           lasterr;
    int           cmdcount;
};
static devclass_t psm_devclass;
#define PSM_SOFTC(unit)	((struct psm_softc*)devclass_get_softc(psm_devclass, unit))

/* driver state flags (state) */
#define PSM_VALID		0x80
#define PSM_OPEN		1	/* Device is open */
#define PSM_ASLP		2	/* Waiting for mouse data */
#define PSM_SOFTARMED		4	/* Software interrupt armed */
#define PSM_NEED_SYNCBITS	8	/* Set syncbits using next data pkt */

/* driver configuration flags (config) */
#define PSM_CONFIG_RESOLUTION	0x000f	/* resolution */
#define PSM_CONFIG_ACCEL	0x00f0  /* acceleration factor */
#define PSM_CONFIG_NOCHECKSYNC	0x0100  /* disable sync. test */
#define PSM_CONFIG_NOIDPROBE	0x0200  /* disable mouse model probe */
#define PSM_CONFIG_NORESET	0x0400  /* don't reset the mouse */
#define PSM_CONFIG_FORCETAP	0x0800  /* assume `tap' action exists */
#define PSM_CONFIG_IGNPORTERROR	0x1000  /* ignore error in aux port test */
#define PSM_CONFIG_HOOKRESUME	0x2000	/* hook the system resume event */
#define PSM_CONFIG_INITAFTERSUSPEND 0x4000 /* init the device at the resume event */
#define PSM_CONFIG_SYNCHACK	0x8000 /* enable `out-of-sync' hack */

#define PSM_CONFIG_FLAGS	(PSM_CONFIG_RESOLUTION 		\
				    | PSM_CONFIG_ACCEL		\
				    | PSM_CONFIG_NOCHECKSYNC	\
				    | PSM_CONFIG_SYNCHACK	\
				    | PSM_CONFIG_NOIDPROBE	\
				    | PSM_CONFIG_NORESET	\
				    | PSM_CONFIG_FORCETAP	\
				    | PSM_CONFIG_IGNPORTERROR	\
				    | PSM_CONFIG_HOOKRESUME	\
				    | PSM_CONFIG_INITAFTERSUSPEND)

/* other flags (flags) */
#define PSM_FLAGS_FINGERDOWN	0x0001 /* VersaPad finger down */

/* Tunables */
static int synaptics_support = 0;
TUNABLE_INT("hw.psm.synaptics_support", &synaptics_support);

static int verbose = PSM_DEBUG;
TUNABLE_INT("debug.psm.loglevel", &verbose);

/* for backward compatibility */
#define OLD_MOUSE_GETHWINFO	_IOR('M', 1, old_mousehw_t)
#define OLD_MOUSE_GETMODE	_IOR('M', 2, old_mousemode_t)
#define OLD_MOUSE_SETMODE	_IOW('M', 3, old_mousemode_t)

typedef struct old_mousehw {
    int buttons;
    int iftype;
    int type;
    int hwid;
} old_mousehw_t;

typedef struct old_mousemode {
    int protocol;
    int rate;
    int resolution;
    int accelfactor;
} old_mousemode_t;

/* packet formatting function */
typedef int packetfunc_t(struct psm_softc *, unsigned char *,
			      int *, int, mousestatus_t *);

/* function prototypes */
static void psmidentify(driver_t *, device_t);
static int psmprobe(device_t);
static int psmattach(device_t);
static int psmdetach(device_t);
static int psmresume(device_t);

static d_open_t psmopen;
static d_close_t psmclose;
static d_read_t psmread;
static d_ioctl_t psmioctl;
static d_poll_t psmpoll;

static int enable_aux_dev(KBDC);
static int disable_aux_dev(KBDC);
static int get_mouse_status(KBDC, int *, int, int);
static int get_aux_id(KBDC);
static int set_mouse_sampling_rate(KBDC, int);
static int set_mouse_scaling(KBDC, int);
static int set_mouse_resolution(KBDC, int);
static int set_mouse_mode(KBDC);
static int get_mouse_buttons(KBDC);
static int is_a_mouse(int);
static void recover_from_error(KBDC);
static int restore_controller(KBDC, int);
static int doinitialize(struct psm_softc *, mousemode_t *);
static int doopen(struct psm_softc *, int);
static int reinitialize(struct psm_softc *, int);
static char *model_name(int);
static void psmsoftintr(void *);
static void psmintr(void *);
static void psmtimeout(void *);
static int timeelapsed(const struct timeval *,
    int, int, const struct timeval *);
static void dropqueue(struct psm_softc *);
static void flushpackets(struct psm_softc *);

/* vendor specific features */
typedef int probefunc_t(struct psm_softc *);

static int mouse_id_proc1(KBDC, int, int, int *);
static int mouse_ext_command(KBDC, int);
static probefunc_t enable_groller;
static probefunc_t enable_gmouse;
static probefunc_t enable_aglide; 
static probefunc_t enable_kmouse;
static probefunc_t enable_msexplorer;
static probefunc_t enable_msintelli;
static probefunc_t enable_4dmouse;
static probefunc_t enable_4dplus;
static probefunc_t enable_mmanplus;
static probefunc_t enable_synaptics;
static probefunc_t enable_versapad;
static int tame_mouse(struct psm_softc *, packetbuf_t *, mousestatus_t *, unsigned char *);

static struct {
    int                 model;
    unsigned char	syncmask;
    int 		packetsize;
    probefunc_t 	*probefunc;
} vendortype[] = {
    /*
     * WARNING: the order of probe is very important.  Don't mess it
     * unless you know what you are doing.
     */
    { MOUSE_MODEL_NET,			/* Genius NetMouse */
      0x08, MOUSE_PS2INTELLI_PACKETSIZE, enable_gmouse, },
    { MOUSE_MODEL_NETSCROLL,		/* Genius NetScroll */
      0xc8, 6, enable_groller, },
    { MOUSE_MODEL_MOUSEMANPLUS,		/* Logitech MouseMan+ */
      0x08, MOUSE_PS2_PACKETSIZE, enable_mmanplus, },
    { MOUSE_MODEL_EXPLORER,		/* Microsoft IntelliMouse Explorer */
      0x08, MOUSE_PS2INTELLI_PACKETSIZE, enable_msexplorer, },
    { MOUSE_MODEL_4D,			/* A4 Tech 4D Mouse */
      0x08, MOUSE_4D_PACKETSIZE, enable_4dmouse, },
    { MOUSE_MODEL_4DPLUS,		/* A4 Tech 4D+ Mouse */
      0xc8, MOUSE_4DPLUS_PACKETSIZE, enable_4dplus, },
    { MOUSE_MODEL_INTELLI,		/* Microsoft IntelliMouse */
      0x08, MOUSE_PS2INTELLI_PACKETSIZE, enable_msintelli, },
    { MOUSE_MODEL_GLIDEPOINT,		/* ALPS GlidePoint */
      0xc0, MOUSE_PS2_PACKETSIZE, enable_aglide, },
    { MOUSE_MODEL_THINK,		/* Kensignton ThinkingMouse */
      0x80, MOUSE_PS2_PACKETSIZE, enable_kmouse, },
    { MOUSE_MODEL_VERSAPAD,		/* Interlink electronics VersaPad */
      0xe8, MOUSE_PS2VERSA_PACKETSIZE, enable_versapad, },
    { MOUSE_MODEL_SYNAPTICS,		/* Synaptics Touchpad */
      0xc0, MOUSE_SYNAPTICS_PACKETSIZE, enable_synaptics, },
    { MOUSE_MODEL_GENERIC,
      0xc0, MOUSE_PS2_PACKETSIZE, NULL, },
};
#define GENERIC_MOUSE_ENTRY	((sizeof(vendortype) / sizeof(*vendortype)) - 1)

/* device driver declarateion */
static device_method_t psm_methods[] = {
	/* Device interface */
	DEVMETHOD(device_identify,	psmidentify),
	DEVMETHOD(device_probe,		psmprobe),
	DEVMETHOD(device_attach,	psmattach),
	DEVMETHOD(device_detach,	psmdetach),
	DEVMETHOD(device_resume,	psmresume),

	{ 0, 0 }
};

static driver_t psm_driver = {
    PSM_DRIVER_NAME,
    psm_methods,
    sizeof(struct psm_softc),
};


static struct cdevsw psm_cdevsw = {
	.d_version =	D_VERSION,
	.d_flags =	D_NEEDGIANT,
	.d_open =	psmopen,
	.d_close =	psmclose,
	.d_read =	psmread,
	.d_ioctl =	psmioctl,
	.d_poll =	psmpoll,
	.d_name =	PSM_DRIVER_NAME,
};

/* device I/O routines */
static int
enable_aux_dev(KBDC kbdc)
{
    int res;

    res = send_aux_command(kbdc, PSMC_ENABLE_DEV);
    VLOG(2, (LOG_DEBUG, "psm: ENABLE_DEV return code:%04x\n", res));

    return (res == PSM_ACK);
}

static int
disable_aux_dev(KBDC kbdc)
{
    int res;

    res = send_aux_command(kbdc, PSMC_DISABLE_DEV);
    VLOG(2, (LOG_DEBUG, "psm: DISABLE_DEV return code:%04x\n", res));

    return (res == PSM_ACK);
}

static int
get_mouse_status(KBDC kbdc, int *status, int flag, int len)
{
    int cmd;
    int res;
    int i;

    switch (flag) {
    case 0:
    default:
	cmd = PSMC_SEND_DEV_STATUS;
	break;
    case 1:
	cmd = PSMC_SEND_DEV_DATA;
	break;
    }
    empty_aux_buffer(kbdc, 5);
    res = send_aux_command(kbdc, cmd);
    VLOG(2, (LOG_DEBUG, "psm: SEND_AUX_DEV_%s return code:%04x\n", 
	 (flag == 1) ? "DATA" : "STATUS", res));
    if (res != PSM_ACK)
        return 0;

    for (i = 0; i < len; ++i) {
        status[i] = read_aux_data(kbdc);
	if (status[i] < 0)
	    break;
    }

    VLOG(1, (LOG_DEBUG, "psm: %s %02x %02x %02x\n",
         (flag == 1) ? "data" : "status", status[0], status[1], status[2]));

    return i;
}

static int
get_aux_id(KBDC kbdc)
{
    int res;
    int id;

    empty_aux_buffer(kbdc, 5);
    res = send_aux_command(kbdc, PSMC_SEND_DEV_ID);
    VLOG(2, (LOG_DEBUG, "psm: SEND_DEV_ID return code:%04x\n", res));
    if (res != PSM_ACK)
	return (-1);

    /* 10ms delay */
    DELAY(10000);

    id = read_aux_data(kbdc);
    VLOG(2, (LOG_DEBUG, "psm: device ID: %04x\n", id));

    return id;
}

static int
set_mouse_sampling_rate(KBDC kbdc, int rate)
{
    int res;

    res = send_aux_command_and_data(kbdc, PSMC_SET_SAMPLING_RATE, rate);
    VLOG(2, (LOG_DEBUG, "psm: SET_SAMPLING_RATE (%d) %04x\n", rate, res));

    return ((res == PSM_ACK) ? rate : -1);
}

static int
set_mouse_scaling(KBDC kbdc, int scale)
{
    int res;

    switch (scale) {
    case 1:
    default:
	scale = PSMC_SET_SCALING11;
	break;
    case 2:
	scale = PSMC_SET_SCALING21;
	break;
    }
    res = send_aux_command(kbdc, scale);
    VLOG(2, (LOG_DEBUG, "psm: SET_SCALING%s return code:%04x\n", 
	 (scale == PSMC_SET_SCALING21) ? "21" : "11", res));

    return (res == PSM_ACK);
}

/* `val' must be 0 through PSMD_MAX_RESOLUTION */
static int
set_mouse_resolution(KBDC kbdc, int val)
{
    int res;

    res = send_aux_command_and_data(kbdc, PSMC_SET_RESOLUTION, val);
    VLOG(2, (LOG_DEBUG, "psm: SET_RESOLUTION (%d) %04x\n", val, res));

    return ((res == PSM_ACK) ? val : -1);
}

/*
 * NOTE: once `set_mouse_mode()' is called, the mouse device must be
 * re-enabled by calling `enable_aux_dev()'
 */
static int
set_mouse_mode(KBDC kbdc)
{
    int res;

    res = send_aux_command(kbdc, PSMC_SET_STREAM_MODE);
    VLOG(2, (LOG_DEBUG, "psm: SET_STREAM_MODE return code:%04x\n", res));

    return (res == PSM_ACK);
}

static int
get_mouse_buttons(KBDC kbdc)
{
    int c = 2;		/* assume two buttons by default */
    int status[3];

    /*
     * NOTE: a special sequence to obtain Logitech Mouse specific
     * information: set resolution to 25 ppi, set scaling to 1:1, set
     * scaling to 1:1, set scaling to 1:1. Then the second byte of the
     * mouse status bytes is the number of available buttons.
     * Some manufactures also support this sequence.
     */
    if (set_mouse_resolution(kbdc, PSMD_RES_LOW) != PSMD_RES_LOW)
        return c;
    if (set_mouse_scaling(kbdc, 1) && set_mouse_scaling(kbdc, 1)
        && set_mouse_scaling(kbdc, 1) 
	&& (get_mouse_status(kbdc, status, 0, 3) >= 3)) {
        if (status[1] != 0)
            return status[1];
    }
    return c;
}

/* misc subroutines */
/*
 * Someday, I will get the complete list of valid pointing devices and
 * their IDs... XXX
 */
static int
is_a_mouse(int id)
{
#if 0
    static int valid_ids[] = {
        PSM_MOUSE_ID,		/* mouse */
        PSM_BALLPOINT_ID,	/* ballpoint device */
        PSM_INTELLI_ID,		/* Intellimouse */
        PSM_EXPLORER_ID,	/* Intellimouse Explorer */
        -1			/* end of table */
    };
    int i;

    for (i = 0; valid_ids[i] >= 0; ++i)
        if (valid_ids[i] == id)
            return TRUE;
    return FALSE;
#else
    return TRUE;
#endif
}

static char *
model_name(int model)
{
    static struct {
	int model_code;
	char *model_name;
    } models[] = {
        { MOUSE_MODEL_NETSCROLL,	"NetScroll" },
        { MOUSE_MODEL_NET,		"NetMouse/NetScroll Optical" },
        { MOUSE_MODEL_GLIDEPOINT,	"GlidePoint" },
        { MOUSE_MODEL_THINK,		"ThinkingMouse" },
        { MOUSE_MODEL_INTELLI,		"IntelliMouse" },
        { MOUSE_MODEL_MOUSEMANPLUS,	"MouseMan+" },
        { MOUSE_MODEL_VERSAPAD,		"VersaPad" },
        { MOUSE_MODEL_EXPLORER,		"IntelliMouse Explorer" },
        { MOUSE_MODEL_4D,		"4D Mouse" },
        { MOUSE_MODEL_4DPLUS,		"4D+ Mouse" },
        { MOUSE_MODEL_SYNAPTICS,	"Synaptics Touchpad" },
        { MOUSE_MODEL_GENERIC,		"Generic PS/2 mouse" },
        { MOUSE_MODEL_UNKNOWN,		NULL },
    };
    int i;

    for (i = 0; models[i].model_code != MOUSE_MODEL_UNKNOWN; ++i) {
	if (models[i].model_code == model)
	    return models[i].model_name;
    }
    return "Unknown";
}

static void
recover_from_error(KBDC kbdc)
{
    /* discard anything left in the output buffer */
    empty_both_buffers(kbdc, 10);

#if 0
    /*
     * NOTE: KBDC_RESET_KBD may not restore the communication between the
     * keyboard and the controller.
     */
    reset_kbd(kbdc);
#else
    /*
     * NOTE: somehow diagnostic and keyboard port test commands bring the
     * keyboard back.
     */
    if (!test_controller(kbdc)) 
        log(LOG_ERR, "psm: keyboard controller failed.\n");
    /* if there isn't a keyboard in the system, the following error is OK */
    if (test_kbd_port(kbdc) != 0)
	VLOG(1, (LOG_ERR, "psm: keyboard port failed.\n"));
#endif
}

static int
restore_controller(KBDC kbdc, int command_byte)
{
    empty_both_buffers(kbdc, 10);

    if (!set_controller_command_byte(kbdc, 0xff, command_byte)) {
	log(LOG_ERR, "psm: failed to restore the keyboard controller "
		     "command byte.\n");
	empty_both_buffers(kbdc, 10);
	return FALSE;
    } else {
	empty_both_buffers(kbdc, 10);
	return TRUE;
    }
}

/* 
 * Re-initialize the aux port and device. The aux port must be enabled
 * and its interrupt must be disabled before calling this routine. 
 * The aux device will be disabled before returning.
 * The keyboard controller must be locked via `kbdc_lock()' before
 * calling this routine.
 */
static int
doinitialize(struct psm_softc *sc, mousemode_t *mode)
{
    KBDC kbdc = sc->kbdc;
    int stat[3];
    int i;

    switch((i = test_aux_port(kbdc))) {
    case 1:	/* ignore these errors */
    case 2:
    case 3:
    case PSM_ACK:
	if (verbose)
	    log(LOG_DEBUG, "psm%d: strange result for test aux port (%d).\n",
	        sc->unit, i);
	/* FALLTHROUGH */
    case 0:	/* no error */
    	break;
    case -1: 	/* time out */
    default: 	/* error */
    	recover_from_error(kbdc);
	if (sc->config & PSM_CONFIG_IGNPORTERROR)
	    break;
    	log(LOG_ERR, "psm%d: the aux port is not functioning (%d).\n",
    	    sc->unit, i);
    	return FALSE;
    }

    if (sc->config & PSM_CONFIG_NORESET) {
	/* 
	 * Don't try to reset the pointing device.  It may possibly be
	 * left in the unknown state, though...
	 */
    } else {
	/* 
	 * NOTE: some controllers appears to hang the `keyboard' when
	 * the aux port doesn't exist and `PSMC_RESET_DEV' is issued. 
	 */
	if (!reset_aux_dev(kbdc)) {
            recover_from_error(kbdc);
            log(LOG_ERR, "psm%d: failed to reset the aux device.\n", sc->unit);
            return FALSE;
	}
    }

    /* 
     * both the aux port and the aux device is functioning, see
     * if the device can be enabled. 
     */
    if (!enable_aux_dev(kbdc) || !disable_aux_dev(kbdc)) {
        log(LOG_ERR, "psm%d: failed to enable the aux device.\n", sc->unit);
        return FALSE;
    }
    empty_both_buffers(kbdc, 10);	/* remove stray data if any */

    if (sc->config & PSM_CONFIG_NOIDPROBE) {
	i = GENERIC_MOUSE_ENTRY;
    } else {
	/* FIXME: hardware ID, mouse buttons? */

	/* other parameters */
	for (i = 0; vendortype[i].probefunc != NULL; ++i) {
	    if ((*vendortype[i].probefunc)(sc)) {
		if (verbose >= 2)
		    log(LOG_ERR, "psm%d: found %s\n", 
			sc->unit, model_name(vendortype[i].model));
		break;
	    }
	}
    }

    sc->hw.model = vendortype[i].model;
    sc->mode.packetsize = vendortype[i].packetsize;

    /* set mouse parameters */
    if (mode != (mousemode_t *)NULL) {
	if (mode->rate > 0)
            mode->rate = set_mouse_sampling_rate(kbdc, mode->rate);
	if (mode->resolution >= 0)
            mode->resolution = set_mouse_resolution(kbdc, mode->resolution);
        set_mouse_scaling(kbdc, 1);
        set_mouse_mode(kbdc);	
    }

    /* Record sync on the next data packet we see. */
    sc->flags |= PSM_NEED_SYNCBITS;

    /* just check the status of the mouse */
    if (get_mouse_status(kbdc, stat, 0, 3) < 3)
        log(LOG_DEBUG, "psm%d: failed to get status (doinitialize).\n",
	    sc->unit);

    return TRUE;
}

static int
doopen(struct psm_softc *sc, int command_byte)
{
    int stat[3];

    /* enable the mouse device */
    if (!enable_aux_dev(sc->kbdc)) {
	/* MOUSE ERROR: failed to enable the mouse because:
	 * 1) the mouse is faulty,
	 * 2) the mouse has been removed(!?)
	 * In the latter case, the keyboard may have hung, and need 
	 * recovery procedure...
	 */
	recover_from_error(sc->kbdc);
#if 0
	/* FIXME: we could reset the mouse here and try to enable
	 * it again. But it will take long time and it's not a good
	 * idea to disable the keyboard that long...
	 */
	if (!doinitialize(sc, &sc->mode) || !enable_aux_dev(sc->kbdc)) {
	    recover_from_error(sc->kbdc);
#else
        {
#endif
            restore_controller(sc->kbdc, command_byte);
	    /* mark this device is no longer available */
	    sc->state &= ~PSM_VALID;	
	    log(LOG_ERR, "psm%d: failed to enable the device (doopen).\n",
		sc->unit);
	    return (EIO);
	}
    }

    if (get_mouse_status(sc->kbdc, stat, 0, 3) < 3) 
        log(LOG_DEBUG, "psm%d: failed to get status (doopen).\n", sc->unit);

    /* enable the aux port and interrupt */
    if (!set_controller_command_byte(sc->kbdc, 
	    kbdc_get_device_mask(sc->kbdc),
	    (command_byte & KBD_KBD_CONTROL_BITS)
		| KBD_ENABLE_AUX_PORT | KBD_ENABLE_AUX_INT)) {
	/* CONTROLLER ERROR */
	disable_aux_dev(sc->kbdc);
        restore_controller(sc->kbdc, command_byte);
	log(LOG_ERR, "psm%d: failed to enable the aux interrupt (doopen).\n",
	    sc->unit);
	return (EIO);
    }

    /* start the watchdog timer */
    sc->watchdog = FALSE;
    sc->callout = timeout(psmtimeout, (void *)(uintptr_t)sc, hz*2);

    return (0);
}

static int
reinitialize(struct psm_softc *sc, int doinit)
{
    int err;
    int c;
    int s;

    /* don't let anybody mess with the aux device */
    if (!kbdc_lock(sc->kbdc, TRUE))
	return (EIO);
    s = spltty();

    /* block our watchdog timer */
    sc->watchdog = FALSE;
    untimeout(psmtimeout, (void *)(uintptr_t)sc, sc->callout);
    callout_handle_init(&sc->callout);

    /* save the current controller command byte */
    empty_both_buffers(sc->kbdc, 10);
    c = get_controller_command_byte(sc->kbdc);
    VLOG(2, (LOG_DEBUG, "psm%d: current command byte: %04x (reinitialize).\n", 
	 sc->unit, c));

    /* enable the aux port but disable the aux interrupt and the keyboard */
    if ((c == -1) || !set_controller_command_byte(sc->kbdc,
	    kbdc_get_device_mask(sc->kbdc),
  	    KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
	        | KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
        /* CONTROLLER ERROR */
	splx(s);
        kbdc_lock(sc->kbdc, FALSE);
	log(LOG_ERR, "psm%d: unable to set the command byte (reinitialize).\n",
	    sc->unit);
	return (EIO);
    }

    /* flush any data */
    if (sc->state & PSM_VALID) {
	disable_aux_dev(sc->kbdc);	/* this may fail; but never mind... */
	empty_aux_buffer(sc->kbdc, 10);
    }
    flushpackets(sc);
    sc->syncerrors = 0;
    sc->pkterrors = 0;
    memset(&sc->lastinputerr, 0, sizeof(sc->lastinputerr));

    /* try to detect the aux device; are you still there? */
    err = 0;
    if (doinit) {
	if (doinitialize(sc, &sc->mode)) {
	    /* yes */
	    sc->state |= PSM_VALID;
	} else {
	    /* the device has gone! */
	    restore_controller(sc->kbdc, c);
	    sc->state &= ~PSM_VALID;
	    log(LOG_ERR, "psm%d: the aux device has gone! (reinitialize).\n",
		sc->unit);
	    err = ENXIO;
	}
    }
    splx(s);

    /* restore the driver state */
    if ((sc->state & PSM_OPEN) && (err == 0)) {
        /* enable the aux device and the port again */
	err = doopen(sc, c);
	if (err != 0) 
	    log(LOG_ERR, "psm%d: failed to enable the device (reinitialize).\n",
		sc->unit);
    } else {
        /* restore the keyboard port and disable the aux port */
        if (!set_controller_command_byte(sc->kbdc, 
                kbdc_get_device_mask(sc->kbdc),
                (c & KBD_KBD_CONTROL_BITS)
                    | KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
            /* CONTROLLER ERROR */
            log(LOG_ERR,
                "psm%d: failed to disable the aux port (reinitialize).\n",
                sc->unit);
            err = EIO;
	}
    }

    kbdc_lock(sc->kbdc, FALSE);
    return (err);
}

/* psm driver entry points */

static void
psmidentify(driver_t *driver, device_t parent)
{
    device_t psmc;
    device_t psm;
    u_long irq;
    int unit;

    unit = device_get_unit(parent);

    /* always add at least one child */
    psm = BUS_ADD_CHILD(parent, KBDC_RID_AUX, driver->name, unit);
    if (psm == NULL)
	return;

    irq = bus_get_resource_start(psm, SYS_RES_IRQ, KBDC_RID_AUX);
    if (irq > 0)
	return;

    /*
     * If the PS/2 mouse device has already been reported by ACPI or
     * PnP BIOS, obtain the IRQ resource from it.
     * (See psmcpnp_attach() below.)
     */
    psmc = device_find_child(device_get_parent(parent),
			     PSMCPNP_DRIVER_NAME, unit);
    if (psmc == NULL)
	return;
    irq = bus_get_resource_start(psmc, SYS_RES_IRQ, 0);
    if (irq <= 0)
	return;
    bus_set_resource(psm, SYS_RES_IRQ, KBDC_RID_AUX, irq, 1);
}

#define endprobe(v)	do {   if (bootverbose)				\
				--verbose;   				\
                            kbdc_set_device_mask(sc->kbdc, mask);	\
			    kbdc_lock(sc->kbdc, FALSE);			\
			    return (v);	     				\
			} while (0)

static int
psmprobe(device_t dev)
{
    int unit = device_get_unit(dev);
    struct psm_softc *sc = device_get_softc(dev);
    int stat[3];
    int command_byte;
    int mask;
    int rid;
    int i;

#if 0
    kbdc_debug(TRUE);
#endif

    /* see if IRQ is available */
    rid = KBDC_RID_AUX;
    sc->intr = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
				      RF_SHAREABLE | RF_ACTIVE);
    if (sc->intr == NULL) {
	if (bootverbose)
            device_printf(dev, "unable to allocate IRQ\n");
        return (ENXIO);
    }
    bus_release_resource(dev, SYS_RES_IRQ, rid, sc->intr);

    sc->unit = unit;
    sc->kbdc = atkbdc_open(device_get_unit(device_get_parent(dev)));
    sc->config = device_get_flags(dev) & PSM_CONFIG_FLAGS;
    /* XXX: for backward compatibility */
#if defined(PSM_HOOKRESUME) || defined(PSM_HOOKAPM)
    sc->config |= 
#ifdef PSM_RESETAFTERSUSPEND
	PSM_CONFIG_HOOKRESUME | PSM_CONFIG_INITAFTERSUSPEND;
#else
	PSM_CONFIG_HOOKRESUME;
#endif
#endif /* PSM_HOOKRESUME | PSM_HOOKAPM */
    sc->flags = 0;
    if (bootverbose)
        ++verbose;

    device_set_desc(dev, "PS/2 Mouse");

    if (!kbdc_lock(sc->kbdc, TRUE)) {
        printf("psm%d: unable to lock the controller.\n", unit);
        if (bootverbose)
            --verbose;
	return (ENXIO);
    }

    /*
     * NOTE: two bits in the command byte controls the operation of the
     * aux port (mouse port): the aux port disable bit (bit 5) and the aux
     * port interrupt (IRQ 12) enable bit (bit 2).
     */

    /* discard anything left after the keyboard initialization */
    empty_both_buffers(sc->kbdc, 10);

    /* save the current command byte; it will be used later */
    mask = kbdc_get_device_mask(sc->kbdc) & ~KBD_AUX_CONTROL_BITS;
    command_byte = get_controller_command_byte(sc->kbdc);
    if (verbose) 
        printf("psm%d: current command byte:%04x\n", unit, command_byte);
    if (command_byte == -1) {
        /* CONTROLLER ERROR */
        printf("psm%d: unable to get the current command byte value.\n",
            unit);
        endprobe(ENXIO);
    }

    /*
     * disable the keyboard port while probing the aux port, which must be
     * enabled during this routine
     */
    if (!set_controller_command_byte(sc->kbdc,
	    KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS,
  	    KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
                | KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
        /* 
	 * this is CONTROLLER ERROR; I don't know how to recover 
         * from this error... 
	 */
        restore_controller(sc->kbdc, command_byte);
        printf("psm%d: unable to set the command byte.\n", unit);
        endprobe(ENXIO);
    }
    write_controller_command(sc->kbdc, KBDC_ENABLE_AUX_PORT);

    /*
     * NOTE: `test_aux_port()' is designed to return with zero if the aux
     * port exists and is functioning. However, some controllers appears
     * to respond with zero even when the aux port doesn't exist. (It may
     * be that this is only the case when the controller DOES have the aux
     * port but the port is not wired on the motherboard.) The keyboard
     * controllers without the port, such as the original AT, are
     * supporsed to return with an error code or simply time out. In any
     * case, we have to continue probing the port even when the controller
     * passes this test.
     *
     * XXX: some controllers erroneously return the error code 1, 2 or 3
     * when it has the perfectly functional aux port. We have to ignore
     * this error code. Even if the controller HAS error with the aux
     * port, it will be detected later...
     * XXX: another incompatible controller returns PSM_ACK (0xfa)...
     */
    switch ((i = test_aux_port(sc->kbdc))) {
    case 1:	   /* ignore these errors */
    case 2:
    case 3:
    case PSM_ACK:
        if (verbose)
	    printf("psm%d: strange result for test aux port (%d).\n",
	        unit, i);
	/* FALLTHROUGH */
    case 0:        /* no error */
        break;
    case -1:        /* time out */
    default:        /* error */
        recover_from_error(sc->kbdc);
	if (sc->config & PSM_CONFIG_IGNPORTERROR)
	    break;
        restore_controller(sc->kbdc, command_byte);
        if (verbose)
            printf("psm%d: the aux port is not functioning (%d).\n",
                unit, i);
        endprobe(ENXIO);
    }

    if (sc->config & PSM_CONFIG_NORESET) {
	/* 
	 * Don't try to reset the pointing device.  It may possibly be
	 * left in the unknown state, though...
	 */
    } else {
	/*
	 * NOTE: some controllers appears to hang the `keyboard' when the aux
	 * port doesn't exist and `PSMC_RESET_DEV' is issued.
	 *
	 * Attempt to reset the controller twice -- this helps
	 * pierce through some KVM switches. The second reset
	 * is non-fatal.
	 */
	if (!reset_aux_dev(sc->kbdc)) {
            recover_from_error(sc->kbdc);
            restore_controller(sc->kbdc, command_byte);
            if (verbose)
        	printf("psm%d: failed to reset the aux device.\n", unit);
            endprobe(ENXIO);
	} else if (!reset_aux_dev(sc->kbdc)) {
	    recover_from_error(sc->kbdc);
	    if (verbose >= 2)
        	printf("psm%d: failed to reset the aux device (2).\n",
        	    unit);
	}
    }

    /*
     * both the aux port and the aux device is functioning, see if the
     * device can be enabled. NOTE: when enabled, the device will start
     * sending data; we shall immediately disable the device once we know
     * the device can be enabled.
     */
    if (!enable_aux_dev(sc->kbdc) || !disable_aux_dev(sc->kbdc)) {
        /* MOUSE ERROR */
	recover_from_error(sc->kbdc);
	restore_controller(sc->kbdc, command_byte);
	if (verbose)
	    printf("psm%d: failed to enable the aux device.\n", unit);
        endprobe(ENXIO);
    }

    /* save the default values after reset */
    if (get_mouse_status(sc->kbdc, stat, 0, 3) >= 3) {
	sc->dflt_mode.rate = sc->mode.rate = stat[2];
	sc->dflt_mode.resolution = sc->mode.resolution = stat[1];
    } else {
	sc->dflt_mode.rate = sc->mode.rate = -1;
	sc->dflt_mode.resolution = sc->mode.resolution = -1;
    }

    /* hardware information */
    sc->hw.iftype = MOUSE_IF_PS2;

    /* verify the device is a mouse */
    sc->hw.hwid = get_aux_id(sc->kbdc);
    if (!is_a_mouse(sc->hw.hwid)) {
        restore_controller(sc->kbdc, command_byte);
        if (verbose)
            printf("psm%d: unknown device type (%d).\n", unit, sc->hw.hwid);
        endprobe(ENXIO);
    }
    switch (sc->hw.hwid) {
    case PSM_BALLPOINT_ID:
        sc->hw.type = MOUSE_TRACKBALL;
        break;
    case PSM_MOUSE_ID:
    case PSM_INTELLI_ID:
    case PSM_EXPLORER_ID:
    case PSM_4DMOUSE_ID:
    case PSM_4DPLUS_ID:
        sc->hw.type = MOUSE_MOUSE;
        break;
    default:
        sc->hw.type = MOUSE_UNKNOWN;
        break;
    }

    if (sc->config & PSM_CONFIG_NOIDPROBE) {
	sc->hw.buttons = 2;
	i = GENERIC_MOUSE_ENTRY;
    } else {
	/* # of buttons */
	sc->hw.buttons = get_mouse_buttons(sc->kbdc);

	/* other parameters */
	for (i = 0; vendortype[i].probefunc != NULL; ++i) {
	    if ((*vendortype[i].probefunc)(sc)) {
		if (verbose >= 2)
		    printf("psm%d: found %s\n",
			   unit, model_name(vendortype[i].model));
		break;
	    }
	}
    }

    sc->hw.model = vendortype[i].model;

    sc->dflt_mode.level = PSM_LEVEL_BASE;
    sc->dflt_mode.packetsize = MOUSE_PS2_PACKETSIZE;
    sc->dflt_mode.accelfactor = (sc->config & PSM_CONFIG_ACCEL) >> 4;
    if (sc->config & PSM_CONFIG_NOCHECKSYNC)
        sc->dflt_mode.syncmask[0] = 0;
    else
        sc->dflt_mode.syncmask[0] = vendortype[i].syncmask;
    if (sc->config & PSM_CONFIG_FORCETAP)
        sc->dflt_mode.syncmask[0] &= ~MOUSE_PS2_TAP;
    sc->dflt_mode.syncmask[1] = 0;	/* syncbits */
    sc->mode = sc->dflt_mode;
    sc->mode.packetsize = vendortype[i].packetsize;

    /* set mouse parameters */
#if 0
    /* 
     * A version of Logitech FirstMouse+ won't report wheel movement,
     * if SET_DEFAULTS is sent...  Don't use this command.
     * This fix was found by Takashi Nishida.
     */
    i = send_aux_command(sc->kbdc, PSMC_SET_DEFAULTS);
    if (verbose >= 2)
	printf("psm%d: SET_DEFAULTS return code:%04x\n", unit, i);
#endif
    if (sc->config & PSM_CONFIG_RESOLUTION) {
        sc->mode.resolution
	    = set_mouse_resolution(sc->kbdc, 
				   (sc->config & PSM_CONFIG_RESOLUTION) - 1);
    } else if (sc->mode.resolution >= 0) {
	sc->mode.resolution
	    = set_mouse_resolution(sc->kbdc, sc->dflt_mode.resolution);
    }
    if (sc->mode.rate > 0) {
	sc->mode.rate = set_mouse_sampling_rate(sc->kbdc, sc->dflt_mode.rate);
    }
    set_mouse_scaling(sc->kbdc, 1);

    /* Record sync on the next data packet we see. */
    sc->flags |= PSM_NEED_SYNCBITS;

    /* just check the status of the mouse */
    /* 
     * NOTE: XXX there are some arcane controller/mouse combinations out 
     * there, which hung the controller unless there is data transmission 
     * after ACK from the mouse.
     */
    if (get_mouse_status(sc->kbdc, stat, 0, 3) < 3) {
        printf("psm%d: failed to get status.\n", unit);
    } else {
	/* 
	 * When in its native mode, some mice operate with different 
	 * default parameters than in the PS/2 compatible mode.
	 */
        sc->dflt_mode.rate = sc->mode.rate = stat[2];
        sc->dflt_mode.resolution = sc->mode.resolution = stat[1];
     }

    /* disable the aux port for now... */
    if (!set_controller_command_byte(sc->kbdc, 
	    KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS,
            (command_byte & KBD_KBD_CONTROL_BITS)
                | KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
        /* 
	 * this is CONTROLLER ERROR; I don't know the proper way to 
         * recover from this error... 
	 */
        restore_controller(sc->kbdc, command_byte);
        printf("psm%d: unable to set the command byte.\n", unit);
        endprobe(ENXIO);
    }

    /* done */
    kbdc_set_device_mask(sc->kbdc, mask | KBD_AUX_CONTROL_BITS);
    kbdc_lock(sc->kbdc, FALSE);
    return (0);
}

static int
psmattach(device_t dev)
{
    int unit = device_get_unit(dev);
    struct psm_softc *sc = device_get_softc(dev);
    int error;
    int rid;

    /* Setup initial state */
    sc->state = PSM_VALID;
    callout_handle_init(&sc->callout);

    /* Setup our interrupt handler */
    rid = KBDC_RID_AUX;
    sc->intr = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
				      RF_SHAREABLE | RF_ACTIVE);
    if (sc->intr == NULL)
	return (ENXIO);
    error = bus_setup_intr(dev, sc->intr, INTR_TYPE_TTY, psmintr, sc, &sc->ih);
    if (error) {
	bus_release_resource(dev, SYS_RES_IRQ, rid, sc->intr);
	return (error);
    }

    /* Done */
    sc->dev = make_dev(&psm_cdevsw, PSM_MKMINOR(unit, FALSE), 0, 0, 0666,
		       "psm%d", unit);
    sc->bdev = make_dev(&psm_cdevsw, PSM_MKMINOR(unit, TRUE), 0, 0, 0666,
			"bpsm%d", unit);

    if (!verbose) {
        printf("psm%d: model %s, device ID %d\n", 
	    unit, model_name(sc->hw.model), sc->hw.hwid & 0x00ff);
    } else {
        printf("psm%d: model %s, device ID %d-%02x, %d buttons\n",
	    unit, model_name(sc->hw.model),
	    sc->hw.hwid & 0x00ff, sc->hw.hwid >> 8, sc->hw.buttons);
	printf("psm%d: config:%08x, flags:%08x, packet size:%d\n",
	    unit, sc->config, sc->flags, sc->mode.packetsize);
	printf("psm%d: syncmask:%02x, syncbits:%02x\n",
	    unit, sc->mode.syncmask[0], sc->mode.syncmask[1]);
    }

    if (bootverbose)
        --verbose;

    return (0);
}

static int
psmdetach(device_t dev)
{
    struct psm_softc *sc;
    int rid;

    sc = device_get_softc(dev);
    if (sc->state & PSM_OPEN)
	return EBUSY;

    rid = KBDC_RID_AUX;
    bus_teardown_intr(dev, sc->intr, sc->ih);
    bus_release_resource(dev, SYS_RES_IRQ, rid, sc->intr);

    destroy_dev(sc->dev);
    destroy_dev(sc->bdev);

    return 0;
}

static int
psmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
{
    int unit = PSM_UNIT(dev);
    struct psm_softc *sc;
    int command_byte;
    int err;
    int s;

    /* Get device data */
    sc = PSM_SOFTC(unit);
    if ((sc == NULL) || (sc->state & PSM_VALID) == 0)
	/* the device is no longer valid/functioning */
        return (ENXIO);

    /* Disallow multiple opens */
    if (sc->state & PSM_OPEN)
        return (EBUSY);

    device_busy(devclass_get_device(psm_devclass, unit));

    /* Initialize state */
    sc->mode.level = sc->dflt_mode.level;
    sc->mode.protocol = sc->dflt_mode.protocol;
    sc->watchdog = FALSE;

    /* flush the event queue */
    sc->queue.count = 0;
    sc->queue.head = 0;
    sc->queue.tail = 0;
    sc->status.flags = 0;
    sc->status.button = 0;
    sc->status.obutton = 0;
    sc->status.dx = 0;
    sc->status.dy = 0;
    sc->status.dz = 0;
    sc->button = 0;
    sc->pqueue_start = 0;
    sc->pqueue_end = 0;

    /* empty input buffer */
    flushpackets(sc);
    sc->syncerrors = 0;
    sc->pkterrors = 0;

    /* don't let timeout routines in the keyboard driver to poll the kbdc */
    if (!kbdc_lock(sc->kbdc, TRUE))
	return (EIO);

    /* save the current controller command byte */
    s = spltty();
    command_byte = get_controller_command_byte(sc->kbdc);

    /* enable the aux port and temporalily disable the keyboard */
    if ((command_byte == -1) 
        || !set_controller_command_byte(sc->kbdc,
	    kbdc_get_device_mask(sc->kbdc),
  	    KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
	        | KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
        /* CONTROLLER ERROR; do you know how to get out of this? */
        kbdc_lock(sc->kbdc, FALSE);
	splx(s);
	log(LOG_ERR, "psm%d: unable to set the command byte (psmopen).\n",
	    unit);
	return (EIO);
    }
    /* 
     * Now that the keyboard controller is told not to generate 
     * the keyboard and mouse interrupts, call `splx()' to allow 
     * the other tty interrupts. The clock interrupt may also occur, 
     * but timeout routines will be blocked by the poll flag set 
     * via `kbdc_lock()'
     */
    splx(s);
  
    /* enable the mouse device */
    err = doopen(sc, command_byte);

    /* done */
    if (err == 0) 
        sc->state |= PSM_OPEN;
    kbdc_lock(sc->kbdc, FALSE);
    return (err);
}

static int
psmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
{
    int unit = PSM_UNIT(dev);
    struct psm_softc *sc = PSM_SOFTC(unit);
    int stat[3];
    int command_byte;
    int s;

    /* don't let timeout routines in the keyboard driver to poll the kbdc */
    if (!kbdc_lock(sc->kbdc, TRUE))
	return (EIO);

    /* save the current controller command byte */
    s = spltty();
    command_byte = get_controller_command_byte(sc->kbdc);
    if (command_byte == -1) {
        kbdc_lock(sc->kbdc, FALSE);
	splx(s);
	return (EIO);
    }

    /* disable the aux interrupt and temporalily disable the keyboard */
    if (!set_controller_command_byte(sc->kbdc, 
	    kbdc_get_device_mask(sc->kbdc),
  	    KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
	        | KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
	log(LOG_ERR, "psm%d: failed to disable the aux int (psmclose).\n",
	    unit);
	/* CONTROLLER ERROR;
	 * NOTE: we shall force our way through. Because the only
	 * ill effect we shall see is that we may not be able
	 * to read ACK from the mouse, and it doesn't matter much 
	 * so long as the mouse will accept the DISABLE command.
	 */
    }
    splx(s);

    /* stop the watchdog timer */
    untimeout(psmtimeout, (void *)(uintptr_t)sc, sc->callout);
    callout_handle_init(&sc->callout);

    /* remove anything left in the output buffer */
    empty_aux_buffer(sc->kbdc, 10);

    /* disable the aux device, port and interrupt */
    if (sc->state & PSM_VALID) {
        if (!disable_aux_dev(sc->kbdc)) {
	    /* MOUSE ERROR; 
	     * NOTE: we don't return error and continue, pretending 
	     * we have successfully disabled the device. It's OK because 
	     * the interrupt routine will discard any data from the mouse
	     * hereafter. 
	     */
	    log(LOG_ERR, "psm%d: failed to disable the device (psmclose).\n",
		unit);
        }

        if (get_mouse_status(sc->kbdc, stat, 0, 3) < 3)
            log(LOG_DEBUG, "psm%d: failed to get status (psmclose).\n", unit);
    }

    if (!set_controller_command_byte(sc->kbdc, 
	    kbdc_get_device_mask(sc->kbdc),
	    (command_byte & KBD_KBD_CONTROL_BITS)
	        | KBD_DISABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
	/* CONTROLLER ERROR; 
	 * we shall ignore this error; see the above comment.
	 */
	log(LOG_ERR, "psm%d: failed to disable the aux port (psmclose).\n",
	    unit);
    }

    /* remove anything left in the output buffer */
    empty_aux_buffer(sc->kbdc, 10);

    /* close is almost always successful */
    sc->state &= ~PSM_OPEN;
    kbdc_lock(sc->kbdc, FALSE);
    device_unbusy(devclass_get_device(psm_devclass, unit));
    return (0);
}

static int
tame_mouse(struct psm_softc *sc, packetbuf_t *pb, mousestatus_t *status, unsigned char *buf)
{
    static unsigned char butmapps2[8] = {
        0,
        MOUSE_PS2_BUTTON1DOWN, 
        MOUSE_PS2_BUTTON2DOWN,
        MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON2DOWN,
        MOUSE_PS2_BUTTON3DOWN,
        MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON3DOWN,
        MOUSE_PS2_BUTTON2DOWN | MOUSE_PS2_BUTTON3DOWN,
        MOUSE_PS2_BUTTON1DOWN | MOUSE_PS2_BUTTON2DOWN | MOUSE_PS2_BUTTON3DOWN,
    };
    static unsigned char butmapmsc[8] = {
        MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON2UP | MOUSE_MSC_BUTTON3UP,
        MOUSE_MSC_BUTTON2UP | MOUSE_MSC_BUTTON3UP,
        MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON3UP,
        MOUSE_MSC_BUTTON3UP,
        MOUSE_MSC_BUTTON1UP | MOUSE_MSC_BUTTON2UP,
        MOUSE_MSC_BUTTON2UP,
        MOUSE_MSC_BUTTON1UP, 
        0,
    };
    int mapped;
    int i;

    if (sc->mode.level == PSM_LEVEL_BASE) {
        mapped = status->button & ~MOUSE_BUTTON4DOWN;
        if (status->button & MOUSE_BUTTON4DOWN) 
	    mapped |= MOUSE_BUTTON1DOWN;
        status->button = mapped;
        buf[0] = MOUSE_PS2_SYNC | butmapps2[mapped & MOUSE_STDBUTTONS];
        i = imax(imin(status->dx, 255), -256);
	if (i < 0)
	    buf[0] |= MOUSE_PS2_XNEG;
        buf[1] = i;
        i = imax(imin(status->dy, 255), -256);
	if (i < 0)
	    buf[0] |= MOUSE_PS2_YNEG;
        buf[2] = i;
	return MOUSE_PS2_PACKETSIZE;
    } else if (sc->mode.level == PSM_LEVEL_STANDARD) {
        buf[0] = MOUSE_MSC_SYNC | butmapmsc[status->button & MOUSE_STDBUTTONS];
        i = imax(imin(status->dx, 255), -256);
        buf[1] = i >> 1;
        buf[3] = i - buf[1];
        i = imax(imin(status->dy, 255), -256);
        buf[2] = i >> 1;
        buf[4] = i - buf[2];
        i = imax(imin(status->dz, 127), -128);
        buf[5] = (i >> 1) & 0x7f;
        buf[6] = (i - (i >> 1)) & 0x7f;
        buf[7] = (~status->button >> 3) & 0x7f;
	return MOUSE_SYS_PACKETSIZE;
    }
    return pb->inputbytes;
}

static int
psmread(struct cdev *dev, struct uio *uio, int flag)
{
    register struct psm_softc *sc = PSM_SOFTC(PSM_UNIT(dev));
    unsigned char buf[PSM_SMALLBUFSIZE];
    int error = 0;
    int s;
    int l;

    if ((sc->state & PSM_VALID) == 0)
	return EIO;

    /* block until mouse activity occured */
    s = spltty();
    while (sc->queue.count <= 0) {
        if (PSM_NBLOCKIO(dev)) {
            splx(s);
            return EWOULDBLOCK;
        }
        sc->state |= PSM_ASLP;
        error = tsleep( sc, PZERO | PCATCH, "psmrea", 0);
        sc->state &= ~PSM_ASLP;
        if (error) {
            splx(s);
            return error;
        } else if ((sc->state & PSM_VALID) == 0) {
            /* the device disappeared! */
            splx(s);
            return EIO;
	}
    }
    splx(s);

    /* copy data to the user land */
    while ((sc->queue.count > 0) && (uio->uio_resid > 0)) {
        s = spltty();
	l = imin(sc->queue.count, uio->uio_resid);
	if (l > sizeof(buf))
	    l = sizeof(buf);
	if (l > sizeof(sc->queue.buf) - sc->queue.head) {
	    bcopy(&sc->queue.buf[sc->queue.head], &buf[0], 
		sizeof(sc->queue.buf) - sc->queue.head);
	    bcopy(&sc->queue.buf[0], 
		&buf[sizeof(sc->queue.buf) - sc->queue.head],
		l - (sizeof(sc->queue.buf) - sc->queue.head));
	} else {
	    bcopy(&sc->queue.buf[sc->queue.head], &buf[0], l);
	}
	sc->queue.count -= l;
	sc->queue.head = (sc->queue.head + l) % sizeof(sc->queue.buf);
        splx(s);
        error = uiomove(buf, l, uio);
        if (error)
	    break;
    }

    return error;
}

static int
block_mouse_data(struct psm_softc *sc, int *c)
{
    int s;

    if (!kbdc_lock(sc->kbdc, TRUE)) 
	return EIO;

    s = spltty();
    *c = get_controller_command_byte(sc->kbdc);
    if ((*c == -1) 
	|| !set_controller_command_byte(sc->kbdc, 
	    kbdc_get_device_mask(sc->kbdc),
            KBD_DISABLE_KBD_PORT | KBD_DISABLE_KBD_INT
                | KBD_ENABLE_AUX_PORT | KBD_DISABLE_AUX_INT)) {
        /* this is CONTROLLER ERROR */
	splx(s);
        kbdc_lock(sc->kbdc, FALSE);
	return EIO;
    }

    /* 
     * The device may be in the middle of status data transmission.
     * The transmission will be interrupted, thus, incomplete status 
     * data must be discarded. Although the aux interrupt is disabled 
     * at the keyboard controller level, at most one aux interrupt 
     * may have already been pending and a data byte is in the 
     * output buffer; throw it away. Note that the second argument 
     * to `empty_aux_buffer()' is zero, so that the call will just 
     * flush the internal queue.
     * `psmintr()' will be invoked after `splx()' if an interrupt is
     * pending; it will see no data and returns immediately.
     */
    empty_aux_buffer(sc->kbdc, 0);	/* flush the queue */
    read_aux_data_no_wait(sc->kbdc);	/* throw away data if any */
    flushpackets(sc);
    splx(s);

    return 0;
}

static void
dropqueue(struct psm_softc *sc)
{

    	sc->queue.count = 0;
   	sc->queue.head = 0;
    	sc->queue.tail = 0;
	if ((sc->state & PSM_SOFTARMED) != 0) {
		sc->state &= ~PSM_SOFTARMED;
		untimeout(psmsoftintr, (void *)(uintptr_t)sc, sc->softcallout);
	}
	sc->pqueue_start = sc->pqueue_end;
}

static void
flushpackets(struct psm_softc *sc)
{

	dropqueue(sc);
	bzero(&sc->pqueue, sizeof(sc->pqueue));
}

static int
unblock_mouse_data(struct psm_softc *sc, int c)
{
    int error = 0;

    /* 
     * We may have seen a part of status data during `set_mouse_XXX()'.
     * they have been queued; flush it.
     */
    empty_aux_buffer(sc->kbdc, 0);

    /* restore ports and interrupt */
    if (!set_controller_command_byte(sc->kbdc, 
            kbdc_get_device_mask(sc->kbdc),
	    c & (KBD_KBD_CONTROL_BITS | KBD_AUX_CONTROL_BITS))) {
        /* CONTROLLER ERROR; this is serious, we may have
         * been left with the inaccessible keyboard and
         * the disabled mouse interrupt. 
         */
        error = EIO;
    }

    kbdc_lock(sc->kbdc, FALSE);
    return error;
}

static int
psmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
    struct psm_softc *sc = PSM_SOFTC(PSM_UNIT(dev));
    mousemode_t mode;
    mousestatus_t status;
#if (defined(MOUSE_GETVARS))
    mousevar_t *var;
#endif
    mousedata_t *data;
    int stat[3];
    int command_byte;
    int error = 0;
    int s;

    /* Perform IOCTL command */
    switch (cmd) {

    case OLD_MOUSE_GETHWINFO:
	s = spltty();
        ((old_mousehw_t *)addr)->buttons = sc->hw.buttons;
        ((old_mousehw_t *)addr)->iftype = sc->hw.iftype;
        ((old_mousehw_t *)addr)->type = sc->hw.type;
        ((old_mousehw_t *)addr)->hwid = sc->hw.hwid & 0x00ff;
	splx(s);
        break;

    case MOUSE_GETHWINFO:
	s = spltty();
        *(mousehw_t *)addr = sc->hw;
	if (sc->mode.level == PSM_LEVEL_BASE)
	    ((mousehw_t *)addr)->model = MOUSE_MODEL_GENERIC;
	splx(s);
        break;

    case MOUSE_SYN_GETHWINFO:
	s = spltty();
	if (synaptics_support && sc->hw.model == MOUSE_MODEL_SYNAPTICS)
	    *(synapticshw_t *)addr = sc->synhw;
	else
	    error = EINVAL;
	splx(s);
	break;

    case OLD_MOUSE_GETMODE:
	s = spltty();
	switch (sc->mode.level) {
	case PSM_LEVEL_BASE:
	    ((old_mousemode_t *)addr)->protocol = MOUSE_PROTO_PS2;
	    break;
	case PSM_LEVEL_STANDARD:
	    ((old_mousemode_t *)addr)->protocol = MOUSE_PROTO_SYSMOUSE;
	    break;
	case PSM_LEVEL_NATIVE:
	    ((old_mousemode_t *)addr)->protocol = MOUSE_PROTO_PS2;
	    break;
	}
        ((old_mousemode_t *)addr)->rate = sc->mode.rate;
        ((old_mousemode_t *)addr)->resolution = sc->mode.resolution;
        ((old_mousemode_t *)addr)->accelfactor = sc->mode.accelfactor;
	splx(s);
        break;

    case MOUSE_GETMODE:
	s = spltty();
        *(mousemode_t *)addr = sc->mode;
	if ((sc->flags & PSM_NEED_SYNCBITS) != 0) {
	    ((mousemode_t *)addr)->syncmask[0] = 0;
	    ((mousemode_t *)addr)->syncmask[1] = 0;
	}
        ((mousemode_t *)addr)->resolution = 
	    MOUSE_RES_LOW - sc->mode.resolution;
	switch (sc->mode.level) {
	case PSM_LEVEL_BASE:
	    ((mousemode_t *)addr)->protocol = MOUSE_PROTO_PS2;
	    ((mousemode_t *)addr)->packetsize = MOUSE_PS2_PACKETSIZE;
	    break;
	case PSM_LEVEL_STANDARD:
	    ((mousemode_t *)addr)->protocol = MOUSE_PROTO_SYSMOUSE;
	    ((mousemode_t *)addr)->packetsize = MOUSE_SYS_PACKETSIZE;
	    ((mousemode_t *)addr)->syncmask[0] = MOUSE_SYS_SYNCMASK;
	    ((mousemode_t *)addr)->syncmask[1] = MOUSE_SYS_SYNC;
	    break;
	case PSM_LEVEL_NATIVE:
	    /* FIXME: this isn't quite correct... XXX */
	    ((mousemode_t *)addr)->protocol = MOUSE_PROTO_PS2;
	    break;
	}
	splx(s);
        break;

    case OLD_MOUSE_SETMODE:
    case MOUSE_SETMODE:
	if (cmd == OLD_MOUSE_SETMODE) {
	    mode.rate = ((old_mousemode_t *)addr)->rate;
	    /*
	     * resolution  old I/F   new I/F
	     * default        0         0
	     * low            1        -2
	     * medium low     2        -3
	     * medium high    3        -4
	     * high           4        -5
	     */
	    if (((old_mousemode_t *)addr)->resolution > 0)
	        mode.resolution = -((old_mousemode_t *)addr)->resolution - 1;
	    mode.accelfactor = ((old_mousemode_t *)addr)->accelfactor;
	    mode.level = -1;
	} else {
	    mode = *(mousemode_t *)addr;
	}

	/* adjust and validate parameters. */
	if (mode.rate > UCHAR_MAX)
	    return EINVAL;
        if (mode.rate == 0)
            mode.rate = sc->dflt_mode.rate;
	else if (mode.rate == -1)
	    /* don't change the current setting */
	    ;
	else if (mode.rate < 0)
	    return EINVAL;
	if (mode.resolution >= UCHAR_MAX)
	    return EINVAL;
	if (mode.resolution >= 200)
	    mode.resolution = MOUSE_RES_HIGH;
	else if (mode.resolution >= 100)
	    mode.resolution = MOUSE_RES_MEDIUMHIGH;
	else if (mode.resolution >= 50)
	    mode.resolution = MOUSE_RES_MEDIUMLOW;
	else if (mode.resolution > 0)
	    mode.resolution = MOUSE_RES_LOW;
        if (mode.resolution == MOUSE_RES_DEFAULT)
            mode.resolution = sc->dflt_mode.resolution;
        else if (mode.resolution == -1)
	    /* don't change the current setting */
	    ;
        else if (mode.resolution < 0) /* MOUSE_RES_LOW/MEDIUM/HIGH */
            mode.resolution = MOUSE_RES_LOW - mode.resolution;
	if (mode.level == -1)
	    /* don't change the current setting */
	    mode.level = sc->mode.level;
	else if ((mode.level < PSM_LEVEL_MIN) || (mode.level > PSM_LEVEL_MAX))
	    return EINVAL;
        if (mode.accelfactor == -1)
	    /* don't change the current setting */
	    mode.accelfactor = sc->mode.accelfactor;
        else if (mode.accelfactor < 0)
	    return EINVAL;

	/* don't allow anybody to poll the keyboard controller */
	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;

        /* set mouse parameters */
	if (mode.rate > 0)
	    mode.rate = set_mouse_sampling_rate(sc->kbdc, mode.rate);
	if (mode.resolution >= 0)
	    mode.resolution = set_mouse_resolution(sc->kbdc, mode.resolution);
	set_mouse_scaling(sc->kbdc, 1);
	get_mouse_status(sc->kbdc, stat, 0, 3);

        s = spltty();
    	sc->mode.rate = mode.rate;
    	sc->mode.resolution = mode.resolution;
    	sc->mode.accelfactor = mode.accelfactor;
    	sc->mode.level = mode.level;
        splx(s);

	unblock_mouse_data(sc, command_byte);
        break;

    case MOUSE_GETLEVEL:
	*(int *)addr = sc->mode.level;
        break;

    case MOUSE_SETLEVEL:
	if ((*(int *)addr < PSM_LEVEL_MIN) || (*(int *)addr > PSM_LEVEL_MAX))
	    return EINVAL;
	sc->mode.level = *(int *)addr;
        break;

    case MOUSE_GETSTATUS:
        s = spltty();
	status = sc->status;
	sc->status.flags = 0;
	sc->status.obutton = sc->status.button;
	sc->status.button = 0;
	sc->status.dx = 0;
	sc->status.dy = 0;
	sc->status.dz = 0;
        splx(s);
        *(mousestatus_t *)addr = status;
        break;

#if (defined(MOUSE_GETVARS))
    case MOUSE_GETVARS:
	var = (mousevar_t *)addr;
	bzero(var, sizeof(*var));
	s = spltty();
        var->var[0] = MOUSE_VARS_PS2_SIG;
        var->var[1] = sc->config;
        var->var[2] = sc->flags;
	splx(s);
        break;

    case MOUSE_SETVARS:
	return ENODEV;
#endif /* MOUSE_GETVARS */

    case MOUSE_READSTATE:
    case MOUSE_READDATA:
	data = (mousedata_t *)addr;
	if (data->len > sizeof(data->buf)/sizeof(data->buf[0]))
	    return EINVAL;

	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;
        if ((data->len = get_mouse_status(sc->kbdc, data->buf, 
		(cmd == MOUSE_READDATA) ? 1 : 0, data->len)) <= 0)
            error = EIO;
	unblock_mouse_data(sc, command_byte);
	break;

#if (defined(MOUSE_SETRESOLUTION))
    case MOUSE_SETRESOLUTION:
	mode.resolution = *(int *)addr;
	if (mode.resolution >= UCHAR_MAX)
	    return EINVAL;
	else if (mode.resolution >= 200)
	    mode.resolution = MOUSE_RES_HIGH;
	else if (mode.resolution >= 100)
	    mode.resolution = MOUSE_RES_MEDIUMHIGH;
	else if (mode.resolution >= 50)
	    mode.resolution = MOUSE_RES_MEDIUMLOW;
	else if (mode.resolution > 0)
	    mode.resolution = MOUSE_RES_LOW;
        if (mode.resolution == MOUSE_RES_DEFAULT)
            mode.resolution = sc->dflt_mode.resolution;
        else if (mode.resolution == -1)
	    mode.resolution = sc->mode.resolution;
        else if (mode.resolution < 0) /* MOUSE_RES_LOW/MEDIUM/HIGH */
            mode.resolution = MOUSE_RES_LOW - mode.resolution;

	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;
        sc->mode.resolution = set_mouse_resolution(sc->kbdc, mode.resolution);
	if (sc->mode.resolution != mode.resolution)
	    error = EIO;
	unblock_mouse_data(sc, command_byte);
        break;
#endif /* MOUSE_SETRESOLUTION */

#if (defined(MOUSE_SETRATE))
    case MOUSE_SETRATE:
	mode.rate = *(int *)addr;
	if (mode.rate > UCHAR_MAX)
	    return EINVAL;
        if (mode.rate == 0)
            mode.rate = sc->dflt_mode.rate;
	else if (mode.rate < 0)
	    mode.rate = sc->mode.rate;

	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;
        sc->mode.rate = set_mouse_sampling_rate(sc->kbdc, mode.rate);
	if (sc->mode.rate != mode.rate)
	    error = EIO;
	unblock_mouse_data(sc, command_byte);
        break;
#endif /* MOUSE_SETRATE */

#if (defined(MOUSE_SETSCALING))
    case MOUSE_SETSCALING:
	if ((*(int *)addr <= 0) || (*(int *)addr > 2))
	    return EINVAL;

	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;
        if (!set_mouse_scaling(sc->kbdc, *(int *)addr))
	    error = EIO;
	unblock_mouse_data(sc, command_byte);
        break;
#endif /* MOUSE_SETSCALING */

#if (defined(MOUSE_GETHWID))
    case MOUSE_GETHWID:
	error = block_mouse_data(sc, &command_byte);
	if (error)
            return error;
        sc->hw.hwid &= ~0x00ff;
        sc->hw.hwid |= get_aux_id(sc->kbdc);
	*(int *)addr = sc->hw.hwid & 0x00ff;
	unblock_mouse_data(sc, command_byte);
        break;
#endif /* MOUSE_GETHWID */

    default:
	return ENOTTY;
    }

    return error;
}

static void
psmtimeout(void *arg)
{
    struct psm_softc *sc;
    int s;

    sc = (struct psm_softc *)arg;
    s = spltty();
    if (sc->watchdog && kbdc_lock(sc->kbdc, TRUE)) {
	VLOG(4, (LOG_DEBUG, "psm%d: lost interrupt?\n", sc->unit));
	psmintr(sc);
	kbdc_lock(sc->kbdc, FALSE);
    }
    sc->watchdog = TRUE;
    splx(s);
    sc->callout = timeout(psmtimeout, (void *)(uintptr_t)sc, hz);
}

/* Add all sysctls under the debug.psm and hw.psm nodes */
SYSCTL_NODE(_debug, OID_AUTO, psm, CTLFLAG_RD, 0, "ps/2 mouse");
SYSCTL_NODE(_hw, OID_AUTO, psm, CTLFLAG_RD, 0, "ps/2 mouse");

SYSCTL_INT(_debug_psm, OID_AUTO, loglevel, CTLFLAG_RW, &verbose, 0, "");

static int psmhz = 20;
SYSCTL_INT(_debug_psm, OID_AUTO, hz, CTLFLAG_RW, &psmhz, 0, "");
static int psmerrsecs = 2;
SYSCTL_INT(_debug_psm, OID_AUTO, errsecs, CTLFLAG_RW, &psmerrsecs, 0, "");
static int psmerrusecs = 0;
SYSCTL_INT(_debug_psm, OID_AUTO, errusecs, CTLFLAG_RW, &psmerrusecs, 0, "");
static int psmsecs = 0;
SYSCTL_INT(_debug_psm, OID_AUTO, secs, CTLFLAG_RW, &psmsecs, 0, "");
static int psmusecs = 500000;
SYSCTL_INT(_debug_psm, OID_AUTO, usecs, CTLFLAG_RW, &psmusecs, 0, "");
static int pkterrthresh = 2;
SYSCTL_INT(_debug_psm, OID_AUTO, pkterrthresh, CTLFLAG_RW, &pkterrthresh, 0, "");

static int tap_threshold = PSM_TAP_THRESHOLD;
SYSCTL_INT(_hw_psm, OID_AUTO, tap_threshold, CTLFLAG_RW, &tap_threshold, 0, "");
static int tap_timeout = PSM_TAP_TIMEOUT;
SYSCTL_INT(_hw_psm, OID_AUTO, tap_timeout, CTLFLAG_RW, &tap_timeout, 0, "");

static void
psmintr(void *arg)
{
    struct psm_softc *sc = arg;
    struct timeval now;
    int c;
    packetbuf_t *pb;


    /* read until there is nothing to read */
    while((c = read_aux_data_no_wait(sc->kbdc)) != -1) {
    
        pb = &sc->pqueue[sc->pqueue_end];
        /* discard the byte if the device is not open */
        if ((sc->state & PSM_OPEN) == 0)
            continue;
    
	getmicrouptime(&now);
	if ((pb->inputbytes > 0) && timevalcmp(&now, &sc->inputtimeout, >)) {
	    VLOG(3, (LOG_DEBUG, "psmintr: delay too long; "
		 "resetting byte count\n"));
	    pb->inputbytes = 0;
	    sc->syncerrors = 0;
	    sc->pkterrors = 0;
	}
	sc->inputtimeout.tv_sec = PSM_INPUT_TIMEOUT/1000000;
	sc->inputtimeout.tv_usec = PSM_INPUT_TIMEOUT%1000000;
	timevaladd(&sc->inputtimeout, &now);

        pb->ipacket[pb->inputbytes++] = c;
        if (pb->inputbytes < sc->mode.packetsize) 
	    continue;

	VLOG(4, (LOG_DEBUG, "psmintr: %02x %02x %02x %02x %02x %02x\n",
	     pb->ipacket[0], pb->ipacket[1], pb->ipacket[2],
	     pb->ipacket[3], pb->ipacket[4], pb->ipacket[5]));

	c = pb->ipacket[0];

	if ((sc->flags & PSM_NEED_SYNCBITS) != 0) {
	    sc->mode.syncmask[1] = (c & sc->mode.syncmask[0]);
	    sc->flags &= ~PSM_NEED_SYNCBITS;
	    VLOG(2, (LOG_DEBUG, "psmintr: Sync bytes now %04x,%04x\n",
	    	 sc->mode.syncmask[0], sc->mode.syncmask[0]));
	} else if ((c & sc->mode.syncmask[0]) != sc->mode.syncmask[1]) {
	    VLOG(3, (LOG_DEBUG, "psmintr: out of sync (%04x != %04x) %d"
		 " cmds since last error.\n", 
		 c & sc->mode.syncmask[0], sc->mode.syncmask[1],
		 sc->cmdcount - sc->lasterr));
	    sc->lasterr = sc->cmdcount;
	    /*
	     * The sync byte test is a weak measure of packet
	     * validity.  Conservatively discard any input yet
	     * to be seen by userland when we detect a sync
	     * error since there is a good chance some of
	     * the queued packets have undetected errors.
	     */
	    dropqueue(sc);
	    if (sc->syncerrors == 0)
		sc->pkterrors++;
	    ++sc->syncerrors;
	    sc->lastinputerr = now;
	    if (sc->syncerrors >= sc->mode.packetsize * 2 ||
	        sc->pkterrors >= pkterrthresh) {

		/*
		 * If we've failed to find a single sync byte in 2
		 * packets worth of data, or we've seen persistent
		 * packet errors during the validation period,
		 * reinitialize the mouse in hopes of returning it
		 * to the expected mode.
		 */
		VLOG(3, (LOG_DEBUG, "psmintr: reset the mouse.\n"));
		reinitialize(sc, TRUE);
	    } else if (sc->syncerrors == sc->mode.packetsize) {

		/*
		 * Try a soft reset after searching for a sync
		 * byte through a packet length of bytes.
		 */
		VLOG(3, (LOG_DEBUG, "psmintr: re-enable the mouse.\n"));
		pb->inputbytes = 0;
		disable_aux_dev(sc->kbdc);
		enable_aux_dev(sc->kbdc);
	    } else {
		VLOG(3, (LOG_DEBUG, "psmintr: discard a byte (%d)\n",
		     sc->syncerrors));
		pb->inputbytes--;
		bcopy(&pb->ipacket[1], &pb->ipacket[0], pb->inputbytes);
	    }
	    continue;
	}

	/*
	 * We have what appears to be a valid packet.
	 * Reset the error counters.
	 */
	sc->syncerrors = 0;

	/*
	 * Drop even good packets if they occur within a timeout
	 * period of a sync error.  This allows the detection of
	 * a change in the mouse's packet mode without exposing
	 * erratic mouse behavior to the user.  Some KVMs forget
	 * enhanced mouse modes during switch events.
	 */
	if (!timeelapsed(&sc->lastinputerr, psmerrsecs, psmerrusecs, &now)) {
		pb->inputbytes = 0;
		continue;
	}

	/*
	 * Now that we're out of the validation period, reset
	 * the packet error count.
	 */
	sc->pkterrors = 0;

	sc->cmdcount++;
	if (++sc->pqueue_end >= PSM_PACKETQUEUE)
		sc->pqueue_end = 0;
	/*
	 * If we've filled the queue then call the softintr ourselves,
	 * otherwise schedule the interrupt for later.
	 */
	if (!timeelapsed(&sc->lastsoftintr, psmsecs, psmusecs, &now) ||
	    (sc->pqueue_end == sc->pqueue_start)) {
    		if ((sc->state & PSM_SOFTARMED) != 0) {
			sc->state &= ~PSM_SOFTARMED;
			untimeout(psmsoftintr, arg, sc->softcallout);
		}
		psmsoftintr(arg);
	} else if ((sc->state & PSM_SOFTARMED) == 0) {
		sc->state |= PSM_SOFTARMED;
		sc->softcallout = timeout(psmsoftintr, arg,
		    psmhz < 1 ? 1 : (hz/psmhz));
	}
    }
}

static void
psmsoftintr(void *arg)
{
    /*
     * the table to turn PS/2 mouse button bits (MOUSE_PS2_BUTTON?DOWN)
     * into `mousestatus' button bits (MOUSE_BUTTON?DOWN).
     */
    static int butmap[8] = {
        0, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN,
        MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
    };
    static int butmap_versapad[8] = {
	0, 
	MOUSE_BUTTON3DOWN, 
	0, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN,
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN
    };
    static int touchpad_buttons;
    static int guest_buttons;
    register struct psm_softc *sc = arg;
    mousestatus_t ms;
    int w, x, y, z;
    int c;
    int l;
    int x0, y0, xavg, yavg, xsensitivity, ysensitivity, sensitivity = 0;
    int s;
    packetbuf_t *pb;

    getmicrouptime(&sc->lastsoftintr);

    s = spltty();

    do {
	
	pb = &sc->pqueue[sc->pqueue_start];
	c = pb->ipacket[0];
	/* 
	 * A kludge for Kensington device! 
	 * The MSB of the horizontal count appears to be stored in 
	 * a strange place.
	 */
	if (sc->hw.model == MOUSE_MODEL_THINK)
	    pb->ipacket[1] |= (c & MOUSE_PS2_XOVERFLOW) ? 0x80 : 0;

        /* ignore the overflow bits... */
        x = (c & MOUSE_PS2_XNEG) ?  pb->ipacket[1] - 256 : pb->ipacket[1];
        y = (c & MOUSE_PS2_YNEG) ?  pb->ipacket[2] - 256 : pb->ipacket[2];
	z = 0;
        ms.obutton = sc->button;		  /* previous button state */
        ms.button = butmap[c & MOUSE_PS2_BUTTONS];
	/* `tapping' action */
	if (sc->config & PSM_CONFIG_FORCETAP)
	    ms.button |= ((c & MOUSE_PS2_TAP)) ? 0 : MOUSE_BUTTON4DOWN;

	switch (sc->hw.model) {

	case MOUSE_MODEL_EXPLORER:
	    /*
	     *          b7 b6 b5 b4 b3 b2 b1 b0
	     * byte 1:  oy ox sy sx 1  M  R  L
	     * byte 2:  x  x  x  x  x  x  x  x
	     * byte 3:  y  y  y  y  y  y  y  y
	     * byte 4:  *  *  S2 S1 s  d2 d1 d0
	     *
	     * L, M, R, S1, S2: left, middle, right and side buttons
	     * s: wheel data sign bit
	     * d2-d0: wheel data
	     */
	    z = (pb->ipacket[3] & MOUSE_EXPLORER_ZNEG)
		? (pb->ipacket[3] & 0x0f) - 16 : (pb->ipacket[3] & 0x0f);
	    ms.button |= (pb->ipacket[3] & MOUSE_EXPLORER_BUTTON4DOWN)
		? MOUSE_BUTTON4DOWN : 0;
	    ms.button |= (pb->ipacket[3] & MOUSE_EXPLORER_BUTTON5DOWN)
		? MOUSE_BUTTON5DOWN : 0;
	    break;

	case MOUSE_MODEL_INTELLI:
	case MOUSE_MODEL_NET:
	    /* wheel data is in the fourth byte */
	    z = (char)pb->ipacket[3];
	    /* some mice may send 7 when there is no Z movement?! XXX */
	    if ((z >= 7) || (z <= -7))
		z = 0;
	    /* some compatible mice have additional buttons */
	    ms.button |= (c & MOUSE_PS2INTELLI_BUTTON4DOWN)
		? MOUSE_BUTTON4DOWN : 0;
	    ms.button |= (c & MOUSE_PS2INTELLI_BUTTON5DOWN)
		? MOUSE_BUTTON5DOWN : 0;
	    break;

	case MOUSE_MODEL_MOUSEMANPLUS:
	    /*
	     * PS2++ protocl packet
	     *
	     *          b7 b6 b5 b4 b3 b2 b1 b0
	     * byte 1:  *  1  p3 p2 1  *  *  *
	     * byte 2:  c1 c2 p1 p0 d1 d0 1  0
	     *
	     * p3-p0: packet type
	     * c1, c2: c1 & c2 == 1, if p2 == 0
	     *         c1 & c2 == 0, if p2 == 1
	     *
	     * packet type: 0 (device type)
	     * See comments in enable_mmanplus() below.
	     * 
	     * packet type: 1 (wheel data)
	     *
	     *          b7 b6 b5 b4 b3 b2 b1 b0
	     * byte 3:  h  *  B5 B4 s  d2 d1 d0
	     *
	     * h: 1, if horizontal roller data
	     *    0, if vertical roller data
	     * B4, B5: button 4 and 5
	     * s: sign bit
	     * d2-d0: roller data
	     *
	     * packet type: 2 (reserved)
	     */
	    if (((c & MOUSE_PS2PLUS_SYNCMASK) == MOUSE_PS2PLUS_SYNC)
		    && (abs(x) > 191)
		    && MOUSE_PS2PLUS_CHECKBITS(pb->ipacket)) {
		/* the extended data packet encodes button and wheel events */
		switch (MOUSE_PS2PLUS_PACKET_TYPE(pb->ipacket)) {
		case 1:
		    /* wheel data packet */
		    x = y = 0;
		    if (pb->ipacket[2] & 0x80) {
			/* horizontal roller count - ignore it XXX*/
		    } else {
			/* vertical roller count */
			z = (pb->ipacket[2] & MOUSE_PS2PLUS_ZNEG)
			    ? (pb->ipacket[2] & 0x0f) - 16
			    : (pb->ipacket[2] & 0x0f);
		    }
		    ms.button |= (pb->ipacket[2] & MOUSE_PS2PLUS_BUTTON4DOWN)
			? MOUSE_BUTTON4DOWN : 0;
		    ms.button |= (pb->ipacket[2] & MOUSE_PS2PLUS_BUTTON5DOWN)
			? MOUSE_BUTTON5DOWN : 0;
		    break;
		case 2:
		    /* this packet type is reserved by Logitech... */
		    /*
		     * IBM ScrollPoint Mouse uses this packet type to
		     * encode both vertical and horizontal scroll movement.
		     */
		    x = y = 0;
		    /* horizontal count */
		    if (pb->ipacket[2] & 0x0f)
			z = (pb->ipacket[2] & MOUSE_SPOINT_WNEG) ? -2 : 2;
		    /* vertical count */
		    if (pb->ipacket[2] & 0xf0)
			z = (pb->ipacket[2] & MOUSE_SPOINT_ZNEG) ? -1 : 1;
#if 0
		    /* vertical count */
		    z = (pb->ipacket[2] & MOUSE_SPOINT_ZNEG)
			? ((pb->ipacket[2] >> 4) & 0x0f) - 16
			: ((pb->ipacket[2] >> 4) & 0x0f);
		    /* horizontal count */
		    w = (pb->ipacket[2] & MOUSE_SPOINT_WNEG)
			? (pb->ipacket[2] & 0x0f) - 16
			: (pb->ipacket[2] & 0x0f);
#endif
		    break;
		case 0:
		    /* device type packet - shouldn't happen */
		    /* FALLTHROUGH */
		default:
		    x = y = 0;
		    ms.button = ms.obutton;
		    VLOG(1, (LOG_DEBUG, "psmintr: unknown PS2++ packet type %d:"
		         " 0x%02x 0x%02x 0x%02x\n",
			 MOUSE_PS2PLUS_PACKET_TYPE(pb->ipacket),
			 pb->ipacket[0], pb->ipacket[1], pb->ipacket[2]));
		    break;
		}
	    } else {
		/* preserve button states */
		ms.button |= ms.obutton & MOUSE_EXTBUTTONS;
	    }
	    break;

	case MOUSE_MODEL_GLIDEPOINT:
	    /* `tapping' action */
	    ms.button |= ((c & MOUSE_PS2_TAP)) ? 0 : MOUSE_BUTTON4DOWN;
	    break;

	case MOUSE_MODEL_NETSCROLL:
	    /* three addtional bytes encode buttons and wheel events */
	    ms.button |= (pb->ipacket[3] & MOUSE_PS2_BUTTON3DOWN)
		? MOUSE_BUTTON4DOWN : 0;
	    ms.button |= (pb->ipacket[3] & MOUSE_PS2_BUTTON1DOWN)
		? MOUSE_BUTTON5DOWN : 0;
	    z = (pb->ipacket[3] & MOUSE_PS2_XNEG) 
		? pb->ipacket[4] - 256 : pb->ipacket[4];
	    break;

	case MOUSE_MODEL_THINK:
	    /* the fourth button state in the first byte */
	    ms.button |= (c & MOUSE_PS2_TAP) ? MOUSE_BUTTON4DOWN : 0;
	    break;

	case MOUSE_MODEL_VERSAPAD:
	    /* VersaPad PS/2 absolute mode message format
	     *
	     * [packet1]     7   6   5   4   3   2   1   0(LSB)
	     *  ipacket[0]:  1   1   0   A   1   L   T   R
	     *  ipacket[1]: H7  H6  H5  H4  H3  H2  H1  H0
	     *  ipacket[2]: V7  V6  V5  V4  V3  V2  V1  V0
	     *  ipacket[3]:  1   1   1   A   1   L   T   R
	     *  ipacket[4]:V11 V10  V9  V8 H11 H10  H9  H8
	     *  ipacket[5]:  0  P6  P5  P4  P3  P2  P1  P0
	     *
	     * [note]
	     *  R: right physical mouse button (1=on)
	     *  T: touch pad virtual button (1=tapping)
	     *  L: left physical mouse button (1=on)
	     *  A: position data is valid (1=valid)
	     *  H: horizontal data (12bit signed integer. H11 is sign bit.)
	     *  V: vertical data (12bit signed integer. V11 is sign bit.)
	     *  P: pressure data
	     *
	     * Tapping is mapped to MOUSE_BUTTON4.
	     */
	    ms.button = butmap_versapad[c & MOUSE_PS2VERSA_BUTTONS];
	    ms.button |= (c & MOUSE_PS2VERSA_TAP) ? MOUSE_BUTTON4DOWN : 0;
	    x = y = 0;
	    if (c & MOUSE_PS2VERSA_IN_USE) {
		x0 = pb->ipacket[1] | (((pb->ipacket[4]) & 0x0f) << 8);
		y0 = pb->ipacket[2] | (((pb->ipacket[4]) & 0xf0) << 4);
		if (x0 & 0x800)
		    x0 -= 0x1000;
		if (y0 & 0x800)
		    y0 -= 0x1000;
		if (sc->flags & PSM_FLAGS_FINGERDOWN) {
		    x = sc->xold - x0;
		    y = y0 - sc->yold;
		    if (x < 0)	/* XXX */
			x++;
		    else if (x)
			x--;
		    if (y < 0)
			y++;
		    else if (y)
			y--;
		} else {
		    sc->flags |= PSM_FLAGS_FINGERDOWN;
		}
		sc->xold = x0;
		sc->yold = y0;
	    } else {
		sc->flags &= ~PSM_FLAGS_FINGERDOWN;
	    }
	    c = ((x < 0) ? MOUSE_PS2_XNEG : 0)
		| ((y < 0) ? MOUSE_PS2_YNEG : 0);
	    break;

	case MOUSE_MODEL_4D:
	    /*
	     *          b7 b6 b5 b4 b3 b2 b1 b0
	     * byte 1:  s2 d2 s1 d1 1  M  R  L
	     * byte 2:  sx x  x  x  x  x  x  x
	     * byte 3:  sy y  y  y  y  y  y  y
	     *
	     * s1: wheel 1 direction
	     * d1: wheel 1 data
	     * s2: wheel 2 direction
	     * d2: wheel 2 data
	     */
	    x = (pb->ipacket[1] & 0x80) ? pb->ipacket[1] - 256 : pb->ipacket[1];
	    y = (pb->ipacket[2] & 0x80) ? pb->ipacket[2] - 256 : pb->ipacket[2];
	    switch (c & MOUSE_4D_WHEELBITS) {
	    case 0x10:
		z = 1;
		break;
	    case 0x30:
		z = -1;
		break;
	    case 0x40:	/* 2nd wheel turning right XXX */
		z = 2;
		break;
	    case 0xc0:	/* 2nd wheel turning left XXX */
		z = -2;
		break;
	    }
	    break;

	case MOUSE_MODEL_4DPLUS:
	    if ((x < 16 - 256) && (y < 16 - 256)) {
		/*
		 *          b7 b6 b5 b4 b3 b2 b1 b0
		 * byte 1:  0  0  1  1  1  M  R  L
		 * byte 2:  0  0  0  0  1  0  0  0
		 * byte 3:  0  0  0  0  S  s  d1 d0
		 *
		 * L, M, R, S: left, middle, right and side buttons
		 * s: wheel data sign bit
		 * d1-d0: wheel data
		 */
		x = y = 0;
		if (pb->ipacket[2] & MOUSE_4DPLUS_BUTTON4DOWN)
		    ms.button |= MOUSE_BUTTON4DOWN;
		z = (pb->ipacket[2] & MOUSE_4DPLUS_ZNEG)
			? ((pb->ipacket[2] & 0x07) - 8)
			: (pb->ipacket[2] & 0x07) ;
	    } else {
		/* preserve previous button states */
		ms.button |= ms.obutton & MOUSE_EXTBUTTONS;
	    }
	    break;

	case MOUSE_MODEL_SYNAPTICS:
	    /* TouchPad PS/2 absolute mode message format
	     *
	     *  Bits:        7   6   5   4   3   2   1   0 (LSB)
	     *  ------------------------------------------------
	     *  ipacket[0]:  1   0  W3  W2   0  W1   R   L
	     *  ipacket[1]: Yb  Ya  Y9  Y8  Xb  Xa  X9  X8
	     *  ipacket[2]: Z7  Z6  Z5  Z4  Z3  Z2  Z1  Z0
	     *  ipacket[3]:  1   1  Yc  Xc   0  W0   D   U
	     *  ipacket[4]: X7  X6  X5  X4  X3  X2  X1  X0
	     *  ipacket[5]: Y7  Y6  Y5  Y4  Y3  Y2  Y1  Y0
	     *
	     * Legend:
	     *  L: left physical mouse button
	     *  R: right physical mouse button
	     *  D: down button
	     *  U: up button
	     *  W: "wrist" value
	     *  X: x position
	     *  Y: x position
	     *  Z: pressure
	     *
	     * Absolute reportable limits:    0 - 6143.
	     * Typical bezel limits:       1472 - 5472.
	     * Typical edge marings:       1632 - 5312.
	     *
	     * w = 3 Passthrough Packet
	     *
	     * Byte 2,5,6 == Byte 1,2,3 of "Guest"
	     */

	    if (!synaptics_support)
		break;

	    /* Sanity check for out of sync packets. */
	    if ((pb->ipacket[0] & 0xc8) != 0x80 ||
		(pb->ipacket[3] & 0xc8) != 0xc0)
		continue;

	    x = y = x0 = y0 = 0;

	    /* Pressure value. */
	    z = pb->ipacket[2];

	    /* Finger width value */
	    if (sc->synhw.capExtended) {
		w = ((pb->ipacket[0] & 0x30) >> 2) |
		    ((pb->ipacket[0] & 0x04) >> 1) |
		    ((pb->ipacket[3] & 0x04) >> 2);
	    } else {
		/* Assume a finger of regular width */
		w = 4;
	    }

	    /* Handle packets from the guest device */
	    if (w == 3 && sc->synhw.capPassthrough) {
		x = ((pb->ipacket[1] & 0x10) ?
		    pb->ipacket[4] - 256 : pb->ipacket[4]);
		y = ((pb->ipacket[1] & 0x20) ?
		    pb->ipacket[5] - 256 : pb->ipacket[5]);
		z = 0;

		guest_buttons = 0;
		if (pb->ipacket[1] & 0x01)
		    guest_buttons |= MOUSE_BUTTON1DOWN;
		if (pb->ipacket[1] & 0x04)
		    guest_buttons |= MOUSE_BUTTON2DOWN;
		if (pb->ipacket[1] & 0x02)
		    guest_buttons |= MOUSE_BUTTON3DOWN;

		ms.button = touchpad_buttons | guest_buttons;
		break;
	    }

	    /* Button presses */
	    touchpad_buttons = 0;
	    if (pb->ipacket[0] & 0x01)
		  touchpad_buttons |= MOUSE_BUTTON1DOWN;
	    if (pb->ipacket[0] & 0x02)
		  touchpad_buttons |= MOUSE_BUTTON3DOWN;

	    if (sc->synhw.capExtended && sc->synhw.capFourButtons) {
		if ((pb->ipacket[3] & 0x01) && (pb->ipacket[0] & 0x01) == 0)
		    touchpad_buttons |= MOUSE_BUTTON4DOWN;
		if ((pb->ipacket[3] & 0x02) && (pb->ipacket[0] & 0x02) == 0)
		    touchpad_buttons |= MOUSE_BUTTON5DOWN;
	    }

	    /* 
	     * In newer pads - bit 0x02 in the third byte of
	     * the packet indicates that we have an extended
	     * button press.
	     */
	    if (pb->ipacket[3] & 0x02) {
	        /* 
		 * if directional_scrolls is not 1, we treat
	     	 * any of the scrolling directions as middle-click.
	     	 */
		if (sc->syninfo.directional_scrolls) {
		    if (pb->ipacket[4] & 0x01)
			touchpad_buttons |= MOUSE_BUTTON4DOWN;
		    if (pb->ipacket[5] & 0x01)
			touchpad_buttons |= MOUSE_BUTTON5DOWN;
		    if (pb->ipacket[4] & 0x02)
			touchpad_buttons |= MOUSE_BUTTON6DOWN;
   		    if (pb->ipacket[5] & 0x02)
			touchpad_buttons |= MOUSE_BUTTON7DOWN;
		} else {
		    if ((pb->ipacket[4] & 0x0F) || (pb->ipacket[5] & 0x0F))
			touchpad_buttons |= MOUSE_BUTTON2DOWN;
		}

	    }

	    ms.button = touchpad_buttons | guest_buttons;
		
	    /* There is a finger on the pad. */
	    if ((w >= 4 && w <= 7) && (z >= 16 && z < 200)) {
		x0 = ((pb->ipacket[3] & 0x10) << 8) |
		    ((pb->ipacket[1] & 0x0f) << 8) |
		    pb->ipacket[4];
		y0 = ((pb->ipacket[3] & 0x20) << 7) |
		    ((pb->ipacket[1] & 0xf0) << 4) |
		    pb->ipacket[5];

		if (sc->flags & PSM_FLAGS_FINGERDOWN) {
		    x = x0 - sc->xold;
		    y = y0 - sc->yold;

		    /* we compute averages of x and y movement */
		    if (sc->xaverage == 0)
			sc->xaverage=x;

		    if (sc->yaverage == 0)
			sc->yaverage=y;

                    xavg = sc->xaverage;
                    yavg = sc->yaverage;

		    sc->xaverage = (xavg + x) >> 1;
		    sc->yaverage = (yavg + y) >> 1;

		    /* 
		     * then use the averages to compute a sensitivity level
		     * in each dimension
		     */
		    xsensitivity = (sc->xaverage - xavg);
		    if (xsensitivity < 0)
			xsensitivity = -xsensitivity;

		    ysensitivity = (sc->yaverage - yavg);
		    if (ysensitivity < 0)
			ysensitivity = -ysensitivity;

		    /* 
		     * The sensitivity level is higher the faster the finger
		     * is moving. It also tends to be higher in the middle
		     * of a touchpad motion than on either end
		     *
		     * Note - sensitivity gets to 0 when moving slowly - so
		     * we add 1 to it to give it a meaningful value in that case.
		     */
		    sensitivity = (xsensitivity & ysensitivity)+1;

		    /* 
		     * If either our x or y change is greater than our
		     * hi/low speed threshold - we do the high-speed
		     * absolute to relative calculation otherwise we
		     * do the low-speed calculation.
		     */
		    if ((x>sc->syninfo.low_speed_threshold ||
			 x<-sc->syninfo.low_speed_threshold) ||
			(y>sc->syninfo.low_speed_threshold ||
			 y<-sc->syninfo.low_speed_threshold)) {
		    x0 = (x0 + sc->xold * 3) / 4;
		    y0 = (y0 + sc->yold * 3) / 4;
		    x = (x0 - sc->xold) * 10 / 85;
		    y = (y0 - sc->yold) * 10 / 85;
		} else {
			/* 
			 * This is the low speed calculation.
			 * We simply check to see if our movement
			 * is more than our minimum movement threshold
			 * and if it is - set the movement to 1 in the
			 * correct direction.
			 * NOTE - Normally this would result in pointer
			 * movement that was WAY too fast.  This works
			 * due to the movement squelch we do later.
			 */
			if (x < -sc->syninfo.min_movement)
		   	    x = -1;
			else if (x > sc->syninfo.min_movement)
			    x = 1;
			else
			   x = 0;
			if (y < -sc->syninfo.min_movement)
			   y = -1;
			else if (y > sc->syninfo.min_movement)
			   y = 1;
			else
			   y = 0;

		    }
		} else {
		    sc->flags |= PSM_FLAGS_FINGERDOWN;
		}

		/* 
		 * ok - the squelch process.  Take our sensitivity value
		 * and add it to the current squelch value - if squelch
		 * is less than our squelch threshold we kill the movement,
		 * otherwise we reset squelch and pass the movement through.
		 * Since squelch is cumulative - when mouse movement is slow
		 * (around sensitivity 1) the net result is that only
		 * 1 out of every squelch_level packets is
		 * delivered, effectively slowing down the movement.
		 */
		sc->squelch += sensitivity;
		if (sc->squelch < sc->syninfo.squelch_level) {
		    x = 0;
		    y = 0;
		} else
		    sc->squelch = 0;

		sc->xold = x0;
		sc->yold = y0;
		sc->zmax = imax(z, sc->zmax);
	    } else {
		sc->flags &= ~PSM_FLAGS_FINGERDOWN;

		if (sc->zmax > tap_threshold &&
		    timevalcmp(&sc->lastsoftintr, &sc->taptimeout, <=)) {
			if (w == 0)
			    ms.button |= MOUSE_BUTTON3DOWN;
			else if (w == 1)
			    ms.button |= MOUSE_BUTTON2DOWN;
			else
			    ms.button |= MOUSE_BUTTON1DOWN;
		}

		sc->zmax = 0;
		sc->taptimeout.tv_sec = tap_timeout / 1000000;
		sc->taptimeout.tv_usec = tap_timeout % 1000000;
		timevaladd(&sc->taptimeout, &sc->lastsoftintr);
	    }

	    /* Use the extra buttons as a scrollwheel */
	    if (ms.button & MOUSE_BUTTON4DOWN)
		z = -1;
	    else if (ms.button & MOUSE_BUTTON5DOWN)
		z = 1;
	    else
		z = 0;

	    break;

	case MOUSE_MODEL_GENERIC:
	default:
	    break;
	}

        /* scale values */
        if (sc->mode.accelfactor >= 1) {
            if (x != 0) {
                x = x * x / sc->mode.accelfactor;
                if (x == 0)
                    x = 1;
                if (c & MOUSE_PS2_XNEG)
                    x = -x;
            }
            if (y != 0) {
                y = y * y / sc->mode.accelfactor;
                if (y == 0)
                    y = 1;
                if (c & MOUSE_PS2_YNEG)
                    y = -y;
            }
        }

        ms.dx = x;
        ms.dy = y;
        ms.dz = z;
        ms.flags = ((x || y || z) ? MOUSE_POSCHANGED : 0) 
	    | (ms.obutton ^ ms.button);

	if (sc->mode.level < PSM_LEVEL_NATIVE)
	    pb->inputbytes = tame_mouse(sc, pb, &ms, pb->ipacket);

        sc->status.flags |= ms.flags;
        sc->status.dx += ms.dx;
        sc->status.dy += ms.dy;
        sc->status.dz += ms.dz;
        sc->status.button = ms.button;
        sc->button = ms.button;

	sc->watchdog = FALSE;

        /* queue data */
        if (sc->queue.count + pb->inputbytes < sizeof(sc->queue.buf)) {
	    l = imin(pb->inputbytes, sizeof(sc->queue.buf) - sc->queue.tail);
	    bcopy(&pb->ipacket[0], &sc->queue.buf[sc->queue.tail], l);
	    if (pb->inputbytes > l)
	        bcopy(&pb->ipacket[l], &sc->queue.buf[0], pb->inputbytes - l);
            sc->queue.tail = 
		(sc->queue.tail + pb->inputbytes) % sizeof(sc->queue.buf);
            sc->queue.count += pb->inputbytes;
	}
        pb->inputbytes = 0;

	if (++sc->pqueue_start >= PSM_PACKETQUEUE)
		sc->pqueue_start = 0;
    } while (sc->pqueue_start != sc->pqueue_end);
    if (sc->state & PSM_ASLP) {
        sc->state &= ~PSM_ASLP;
        wakeup( sc);
    }
    selwakeuppri(&sc->rsel, PZERO);
    sc->state &= ~PSM_SOFTARMED;
    splx(s);
}

static int
psmpoll(struct cdev *dev, int events, struct thread *td)
{
    struct psm_softc *sc = PSM_SOFTC(PSM_UNIT(dev));
    int s;
    int revents = 0;

    /* Return true if a mouse event available */
    s = spltty();
    if (events & (POLLIN | POLLRDNORM)) {
	if (sc->queue.count > 0)
	    revents |= events & (POLLIN | POLLRDNORM);
	else
	    selrecord(td, &sc->rsel);
    }
    splx(s);

    return (revents);
}

/* vendor/model specific routines */

static int mouse_id_proc1(KBDC kbdc, int res, int scale, int *status)
{
    if (set_mouse_resolution(kbdc, res) != res)
        return FALSE;
    if (set_mouse_scaling(kbdc, scale)
	&& set_mouse_scaling(kbdc, scale)
	&& set_mouse_scaling(kbdc, scale) 
	&& (get_mouse_status(kbdc, status, 0, 3) >= 3)) 
	return TRUE;
    return FALSE;
}

static int 
mouse_ext_command(KBDC kbdc, int command)
{
    int c;

    c = (command >> 6) & 0x03;
    if (set_mouse_resolution(kbdc, c) != c)
	return FALSE;
    c = (command >> 4) & 0x03;
    if (set_mouse_resolution(kbdc, c) != c)
	return FALSE;
    c = (command >> 2) & 0x03;
    if (set_mouse_resolution(kbdc, c) != c)
	return FALSE;
    c = (command >> 0) & 0x03;
    if (set_mouse_resolution(kbdc, c) != c)
	return FALSE;
    return TRUE;
}

#if notyet
/* Logitech MouseMan Cordless II */
static int
enable_lcordless(struct psm_softc *sc)
{
    int status[3];
    int ch;

    if (!mouse_id_proc1(sc->kbdc, PSMD_RES_HIGH, 2, status))
        return FALSE;
    if (status[1] == PSMD_RES_HIGH)
	return FALSE;
    ch = (status[0] & 0x07) - 1;	/* channel # */
    if ((ch <= 0) || (ch > 4))
	return FALSE;
    /* 
     * status[1]: always one?
     * status[2]: battery status? (0-100)
     */
    return TRUE;
}
#endif /* notyet */

/* Genius NetScroll Mouse, MouseSystems SmartScroll Mouse */
static int
enable_groller(struct psm_softc *sc)
{
    int status[3];

    /*
     * The special sequence to enable the fourth button and the
     * roller. Immediately after this sequence check status bytes.
     * if the mouse is NetScroll, the second and the third bytes are 
     * '3' and 'D'.
     */

    /*
     * If the mouse is an ordinary PS/2 mouse, the status bytes should
     * look like the following.
     * 
     * byte 1 bit 7 always 0
     *        bit 6 stream mode (0)
     *        bit 5 disabled (0)
     *        bit 4 1:1 scaling (0)
     *        bit 3 always 0
     *        bit 0-2 button status
     * byte 2 resolution (PSMD_RES_HIGH)
     * byte 3 report rate (?)
     */

    if (!mouse_id_proc1(sc->kbdc, PSMD_RES_HIGH, 1, status))
        return FALSE;
    if ((status[1] != '3') || (status[2] != 'D'))
        return FALSE;
    /* FIXME: SmartScroll Mouse has 5 buttons! XXX */
    sc->hw.buttons = 4;
    return TRUE;
}

/* Genius NetMouse/NetMouse Pro, ASCII Mie Mouse, NetScroll Optical */
static int
enable_gmouse(struct psm_softc *sc)
{
    int status[3];

    /*
     * The special sequence to enable the middle, "rubber" button. 
     * Immediately after this sequence check status bytes.
     * if the mouse is NetMouse, NetMouse Pro, or ASCII MIE Mouse, 
     * the second and the third bytes are '3' and 'U'.
     * NOTE: NetMouse reports that it has three buttons although it has
     * two buttons and a rubber button. NetMouse Pro and MIE Mouse
     * say they have three buttons too and they do have a button on the
     * side...
     */
    if (!mouse_id_proc1(sc->kbdc, PSMD_RES_HIGH, 1, status))
        return FALSE;
    if ((status[1] != '3') || (status[2] != 'U'))
        return FALSE;
    return TRUE;
}

/* ALPS GlidePoint */
static int
enable_aglide(struct psm_softc *sc)
{
    int status[3];

    /*
     * The special sequence to obtain ALPS GlidePoint specific
     * information. Immediately after this sequence, status bytes will 
     * contain something interesting.
     * NOTE: ALPS produces several models of GlidePoint. Some of those
     * do not respond to this sequence, thus, cannot be detected this way.
     */
    if (set_mouse_sampling_rate(sc->kbdc, 100) != 100)
	return FALSE;
    if (!mouse_id_proc1(sc->kbdc, PSMD_RES_LOW, 2, status))
        return FALSE;
    if ((status[1] == PSMD_RES_LOW) || (status[2] == 100))
        return FALSE;
    return TRUE;
}

/* Kensington ThinkingMouse/Trackball */
static int
enable_kmouse(struct psm_softc *sc)
{
    static unsigned char rate[] = { 20, 60, 40, 20, 20, 60, 40, 20, 20 };
    KBDC kbdc = sc->kbdc;
    int status[3];
    int id1;
    int id2;
    int i;

    id1 = get_aux_id(kbdc);
    if (set_mouse_sampling_rate(kbdc, 10) != 10)
	return FALSE;
    /* 
     * The device is now in the native mode? It returns a different
     * ID value...
     */
    id2 = get_aux_id(kbdc);
    if ((id1 == id2) || (id2 != 2))
	return FALSE;

    if (set_mouse_resolution(kbdc, PSMD_RES_LOW) != PSMD_RES_LOW)
        return FALSE;
#if PSM_DEBUG >= 2
    /* at this point, resolution is LOW, sampling rate is 10/sec */
    if (get_mouse_status(kbdc, status, 0, 3) < 3)
        return FALSE;
#endif

    /*
     * The special sequence to enable the third and fourth buttons.
     * Otherwise they behave like the first and second buttons.
     */
    for (i = 0; i < sizeof(rate)/sizeof(rate[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate[i]) != rate[i])
	    return FALSE;
    }

    /* 
     * At this point, the device is using default resolution and
     * sampling rate for the native mode. 
     */
    if (get_mouse_status(kbdc, status, 0, 3) < 3)
        return FALSE;
    if ((status[1] == PSMD_RES_LOW) || (status[2] == rate[i - 1]))
        return FALSE;

    /* the device appears be enabled by this sequence, diable it for now */
    disable_aux_dev(kbdc);
    empty_aux_buffer(kbdc, 5);

    return TRUE;
}

/* Logitech MouseMan+/FirstMouse+, IBM ScrollPoint Mouse */
static int
enable_mmanplus(struct psm_softc *sc)
{
    KBDC kbdc = sc->kbdc;
    int data[3];

    /* the special sequence to enable the fourth button and the roller. */
    /*
     * NOTE: for ScrollPoint to respond correctly, the SET_RESOLUTION
     * must be called exactly three times since the last RESET command
     * before this sequence. XXX
     */
    if (!set_mouse_scaling(kbdc, 1))
	return FALSE;
    if (!mouse_ext_command(kbdc, 0x39) || !mouse_ext_command(kbdc, 0xdb))
	return FALSE;
    if (get_mouse_status(kbdc, data, 1, 3) < 3)
        return FALSE;

    /*
     * PS2++ protocl, packet type 0
     *
     *          b7 b6 b5 b4 b3 b2 b1 b0
     * byte 1:  *  1  p3 p2 1  *  *  *
     * byte 2:  1  1  p1 p0 m1 m0 1  0
     * byte 3:  m7 m6 m5 m4 m3 m2 m1 m0
     *
     * p3-p0: packet type: 0
     * m7-m0: model ID: MouseMan+:0x50, FirstMouse+:0x51, ScrollPoint:0x58...
     */
    /* check constant bits */
    if ((data[0] & MOUSE_PS2PLUS_SYNCMASK) != MOUSE_PS2PLUS_SYNC)
        return FALSE;
    if ((data[1] & 0xc3) != 0xc2)
        return FALSE;
    /* check d3-d0 in byte 2 */
    if (!MOUSE_PS2PLUS_CHECKBITS(data))
        return FALSE;
    /* check p3-p0 */
    if (MOUSE_PS2PLUS_PACKET_TYPE(data) != 0)
        return FALSE;

    sc->hw.hwid &= 0x00ff;
    sc->hw.hwid |= data[2] << 8;	/* save model ID */

    /*
     * MouseMan+ (or FirstMouse+) is now in its native mode, in which
     * the wheel and the fourth button events are encoded in the
     * special data packet. The mouse may be put in the IntelliMouse mode
     * if it is initialized by the IntelliMouse's method.
     */
    return TRUE;
}

/* MS IntelliMouse Explorer */
static int
enable_msexplorer(struct psm_softc *sc)
{
    static unsigned char rate0[] = { 200, 100, 80, };
    static unsigned char rate1[] = { 200, 200, 80, };
    KBDC kbdc = sc->kbdc;
    int id;
    int i;

    /* the special sequence to enable the extra buttons and the roller. */
    for (i = 0; i < sizeof(rate1)/sizeof(rate1[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate1[i]) != rate1[i])
	    return FALSE;
    }
    /* the device will give the genuine ID only after the above sequence */
    id = get_aux_id(kbdc);
    if (id != PSM_EXPLORER_ID)
	return FALSE;

    sc->hw.hwid = id;
    sc->hw.buttons = 5;		/* IntelliMouse Explorer XXX */

    /*
     * XXX: this is a kludge to fool some KVM switch products
     * which think they are clever enough to know the 4-byte IntelliMouse
     * protocol, and assume any other protocols use 3-byte packets.
     * They don't convey 4-byte data packets from the IntelliMouse Explorer 
     * correctly to the host computer because of this!
     * The following sequence is actually IntelliMouse's "wake up"
     * sequence; it will make the KVM think the mouse is IntelliMouse
     * when it is in fact IntelliMouse Explorer.
     */
    for (i = 0; i < sizeof(rate0)/sizeof(rate0[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate0[i]) != rate0[i])
	    break;
    }
    id = get_aux_id(kbdc);

    return TRUE;
}

/* MS IntelliMouse */
static int
enable_msintelli(struct psm_softc *sc)
{
    /*
     * Logitech MouseMan+ and FirstMouse+ will also respond to this
     * probe routine and act like IntelliMouse.
     */

    static unsigned char rate[] = { 200, 100, 80, };
    KBDC kbdc = sc->kbdc;
    int id;
    int i;

    /* the special sequence to enable the third button and the roller. */
    for (i = 0; i < sizeof(rate)/sizeof(rate[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate[i]) != rate[i])
	    return FALSE;
    }
    /* the device will give the genuine ID only after the above sequence */
    id = get_aux_id(kbdc);
    if (id != PSM_INTELLI_ID)
	return FALSE;

    sc->hw.hwid = id;
    sc->hw.buttons = 3;

    return TRUE;
}

/* A4 Tech 4D Mouse */
static int
enable_4dmouse(struct psm_softc *sc)
{
    /*
     * Newer wheel mice from A4 Tech may use the 4D+ protocol.
     */

    static unsigned char rate[] = { 200, 100, 80, 60, 40, 20 };
    KBDC kbdc = sc->kbdc;
    int id;
    int i;

    for (i = 0; i < sizeof(rate)/sizeof(rate[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate[i]) != rate[i])
	    return FALSE;
    }
    id = get_aux_id(kbdc);
    /*
     * WinEasy 4D, 4 Way Scroll 4D: 6
     * Cable-Free 4D: 8 (4DPLUS)
     * WinBest 4D+, 4 Way Scroll 4D+: 8 (4DPLUS)
     */
    if (id != PSM_4DMOUSE_ID)
	return FALSE;

    sc->hw.hwid = id;
    sc->hw.buttons = 3;		/* XXX some 4D mice have 4? */

    return TRUE;
}

/* A4 Tech 4D+ Mouse */
static int
enable_4dplus(struct psm_softc *sc)
{
    /*
     * Newer wheel mice from A4 Tech seem to use this protocol.
     * Older models are recognized as either 4D Mouse or IntelliMouse.
     */
    KBDC kbdc = sc->kbdc;
    int id;

    /*
     * enable_4dmouse() already issued the following ID sequence...
    static unsigned char rate[] = { 200, 100, 80, 60, 40, 20 };
    int i;

    for (i = 0; i < sizeof(rate)/sizeof(rate[0]); ++i) {
        if (set_mouse_sampling_rate(kbdc, rate[i]) != rate[i])
	    return FALSE;
    }
    */

    id = get_aux_id(kbdc);
    switch (id) {
    case PSM_4DPLUS_ID:
	    sc->hw.buttons = 4;
	    break;
    case PSM_4DPLUS_RFSW35_ID:
	    sc->hw.buttons = 3;
	    break;
    default:
	    return FALSE;
    }

    sc->hw.hwid = id;

    return TRUE;
}

/* Synaptics Touchpad */
static int
enable_synaptics(struct psm_softc *sc)
{
    int status[3];
    KBDC kbdc;

    if (!synaptics_support)
	return (FALSE);

    /* Attach extra synaptics sysctl nodes under hw.psm.synaptics */
    sysctl_ctx_init(&sc->syninfo.sysctl_ctx);
    sc->syninfo.sysctl_tree = SYSCTL_ADD_NODE(&sc->syninfo.sysctl_ctx,
	SYSCTL_STATIC_CHILDREN(_hw_psm), OID_AUTO, "synaptics",
	CTLFLAG_RD, 0, "Synaptics TouchPad");
    
    /*
     * synaptics_directional_scrolls - if non-zero, the directional
     * pad scrolls, otherwise it registers as a middle-click.
     */
    sc->syninfo.directional_scrolls = 1;
    SYSCTL_ADD_INT(&sc->syninfo.sysctl_ctx,
	SYSCTL_CHILDREN(sc->syninfo.sysctl_tree),
	OID_AUTO, "directional_scrolls", CTLFLAG_RW,
	&sc->syninfo.directional_scrolls, 0,
	"directional pad scrolls (1=yes  0=3rd button)");

    /*
     * Synaptics_low_speed_threshold - the number of touchpad units
     * below-which we go into low-speed tracking mode.
     */
    sc->syninfo.low_speed_threshold = 20;
    SYSCTL_ADD_INT(&sc->syninfo.sysctl_ctx,
	SYSCTL_CHILDREN(sc->syninfo.sysctl_tree),
	OID_AUTO, "low_speed_threshold", CTLFLAG_RW, 
	&sc->syninfo.low_speed_threshold, 0,
	"threshold between low and hi speed positioning"); 

    /*
     * Synaptics_min_movement - the number of touchpad units below
     * which we ignore altogether.
     */
    sc->syninfo.min_movement = 2;
    SYSCTL_ADD_INT(&sc->syninfo.sysctl_ctx,
	SYSCTL_CHILDREN(sc->syninfo.sysctl_tree),
	OID_AUTO, "min_movement", CTLFLAG_RW,
	&sc->syninfo.min_movement, 0,
	"ignore touchpad movements less than this");

    /*
     * Synaptics_squelch_level - level at which we squelch movement
     * packets.
     *
     * This effectively sends 1 out of every synaptics_squelch_level
     * packets when * running in low-speed mode.
     */
    sc->syninfo.squelch_level=3;
    SYSCTL_ADD_INT(&sc->syninfo.sysctl_ctx,
	SYSCTL_CHILDREN(sc->syninfo.sysctl_tree),
	OID_AUTO, "squelch_level", CTLFLAG_RW, 
	&sc->syninfo.squelch_level, 0,
	"squelch level for synaptics touchpads");

    kbdc = sc->kbdc;
    disable_aux_dev(kbdc);
    sc->hw.buttons = 3;
    sc->squelch = 0;

    /* Just to be on the safe side */
    set_mouse_scaling(kbdc, 1);
 
    /* Identify the Touchpad version */
    if (mouse_ext_command(kbdc, 0) == 0)
	return (FALSE);
    if (get_mouse_status(kbdc, status, 0, 3) != 3)
	return (FALSE);
    if (status[1] != 0x47)
	return (FALSE);

    sc->synhw.infoMinor = status[0];
    sc->synhw.infoMajor = status[2] & 0x0f;

    if (verbose >= 2)
	printf("Synaptics Touchpad v%d.%d\n",
	    sc->synhw.infoMajor, sc->synhw.infoMinor);

    if (sc->synhw.infoMajor < 4) {
	printf("  Unsupported (pre-v4) Touchpad detected\n");
	return (FALSE);
    }

    /* Get the Touchpad model information */
    if (mouse_ext_command(kbdc, 3) == 0)
	return (FALSE);
    if (get_mouse_status(kbdc, status, 0, 3) != 3)
	return (FALSE);
    if ((status[1] & 0x01) != 0) {
	printf("  Failed to read model information\n");
	return (FALSE);
    }

    sc->synhw.infoRot180   = (status[0] & 0x80) >> 7;
    sc->synhw.infoPortrait = (status[0] & 0x40) >> 6;
    sc->synhw.infoSensor   =  status[0] & 0x3f;
    sc->synhw.infoHardware = (status[1] & 0xfe) >> 1;
    sc->synhw.infoNewAbs   = (status[2] & 0x80) >> 7;
    sc->synhw.capPen       = (status[2] & 0x40) >> 6;
    sc->synhw.infoSimplC   = (status[2] & 0x20) >> 5;
    sc->synhw.infoGeometry =  status[2] & 0x0f;

    if (verbose >= 2) {
	printf("  Model information:\n");
	printf("   infoRot180: %d\n", sc->synhw.infoRot180);
	printf("   infoPortrait: %d\n", sc->synhw.infoPortrait);
	printf("   infoSensor: %d\n", sc->synhw.infoSensor);
	printf("   infoHardware: %d\n", sc->synhw.infoHardware);
	printf("   infoNewAbs: %d\n", sc->synhw.infoNewAbs);
	printf("   capPen: %d\n", sc->synhw.capPen);
	printf("   infoSimplC: %d\n", sc->synhw.infoSimplC);
	printf("   infoGeometry: %d\n", sc->synhw.infoGeometry);
    }

    /* Read the extended capability bits */
    if (mouse_ext_command(kbdc, 2) == 0)
	return (FALSE);
    if (get_mouse_status(kbdc, status, 0, 3) != 3)
	return (FALSE);
    if (status[1] != 0x47) {
	printf("  Failed to read extended capability bits\n");
	return (FALSE);
    }

    /* Set the different capabilities when they exist */
    if ((status[0] & 0x80) >> 7) {
	sc->synhw.capExtended    = (status[0] & 0x80) >> 7;
    	sc->synhw.capPassthrough = (status[2] & 0x80) >> 7;
    	sc->synhw.capSleep       = (status[2] & 0x10) >> 4;
    	sc->synhw.capFourButtons = (status[2] & 0x08) >> 3;
    	sc->synhw.capMultiFinger = (status[2] & 0x02) >> 1;
    	sc->synhw.capPalmDetect  = (status[2] & 0x01);
	
	if (verbose >= 2) {
	    printf("  Extended capabilities:\n");
	    printf("   capExtended: %d\n", sc->synhw.capExtended);
	    printf("   capPassthrough: %d\n", sc->synhw.capPassthrough);
	    printf("   capSleep: %d\n", sc->synhw.capSleep);
	    printf("   capFourButtons: %d\n", sc->synhw.capFourButtons);
	    printf("   capMultiFinger: %d\n", sc->synhw.capMultiFinger);
	    printf("   capPalmDetect: %d\n", sc->synhw.capPalmDetect);
	}

	/*
	 * if we have bits set in status[0] & 0x70 - then we can load
	 * more information about buttons using query 0x09
	 */
        if (status[0] & 0x70) {
    	    if (mouse_ext_command(kbdc, 0x09) == 0)
		return (FALSE);
	    if (get_mouse_status(kbdc, status, 0, 3) != 3)
		return (FALSE);
	    sc->hw.buttons = ((status[1] & 0xf0) >> 4) + 3;
	    if (verbose >= 2)
	       printf("  Additional Buttons: %d\n", sc->hw.buttons -3);
	}

    } else {
	sc->synhw.capExtended = 0;
	    
	if (verbose >= 2)
	    printf("  No extended capabilities\n");
    }

    /*
     * Read the mode byte
     *
     * XXX: Note the Synaptics documentation also defines the first
     * byte of the response to this query to be a constant 0x3b, this
     * does not appear to be true for Touchpads with guest devices.
     */
    if (mouse_ext_command(kbdc, 1) == 0)
	return (FALSE);
    if (get_mouse_status(kbdc, status, 0, 3) != 3)
	return (FALSE);
    if (status[1] != 0x47) {
	printf("  Failed to read mode byte\n");
	return (FALSE);
    }

    /* Set the mode byte -- request wmode where available */
    if (sc->synhw.capExtended)
	mouse_ext_command(kbdc, 0xc1);
    else
	mouse_ext_command(kbdc, 0xc0);

    /* Reset the sampling rate */
    set_mouse_sampling_rate(kbdc, 20);

    /* 
     * Report the correct number of buttons
     *
     * XXX: I'm not sure this is used anywhere.
     */
    if (sc->synhw.capExtended && sc->synhw.capFourButtons)
	sc->hw.buttons = 4;

    return (TRUE);
}

/* Interlink electronics VersaPad */
static int
enable_versapad(struct psm_softc *sc)
{
    KBDC kbdc = sc->kbdc;
    int data[3];

    set_mouse_resolution(kbdc, PSMD_RES_MEDIUM_HIGH); /* set res. 2 */
    set_mouse_sampling_rate(kbdc, 100);		/* set rate 100 */
    set_mouse_scaling(kbdc, 1);			/* set scale 1:1 */
    set_mouse_scaling(kbdc, 1);			/* set scale 1:1 */
    set_mouse_scaling(kbdc, 1);			/* set scale 1:1 */
    set_mouse_scaling(kbdc, 1);			/* set scale 1:1 */
    if (get_mouse_status(kbdc, data, 0, 3) < 3)	/* get status */
	return FALSE;
    if (data[2] != 0xa || data[1] != 0 )	/* rate == 0xa && res. == 0 */
	return FALSE;
    set_mouse_scaling(kbdc, 1);			/* set scale 1:1 */

    sc->config |= PSM_CONFIG_HOOKRESUME | PSM_CONFIG_INITAFTERSUSPEND;

    return TRUE;				/* PS/2 absolute mode */
}

static int
psmresume(device_t dev)
{
    struct psm_softc *sc = device_get_softc(dev);
    int unit = device_get_unit(dev);
    int err;

    VLOG(2, (LOG_NOTICE, "psm%d: system resume hook called.\n", unit));

    if (!(sc->config & PSM_CONFIG_HOOKRESUME))
	return (0);

    err = reinitialize(sc, sc->config & PSM_CONFIG_INITAFTERSUSPEND);

    if ((sc->state & PSM_ASLP) && !(sc->state & PSM_VALID)) {
	/* 
	 * Release the blocked process; it must be notified that the device
	 * cannot be accessed anymore.
	 */
        sc->state &= ~PSM_ASLP;
        wakeup(sc);
    }

    VLOG(2, (LOG_DEBUG, "psm%d: system resume hook exiting.\n", unit));

    return (err);
}

DRIVER_MODULE(psm, atkbdc, psm_driver, psm_devclass, 0, 0);

/*
 * This sucks up assignments from PNPBIOS and ACPI.
 */

/*
 * When the PS/2 mouse device is reported by ACPI or PnP BIOS, it may
 * appear BEFORE the AT keyboard controller.  As the PS/2 mouse device
 * can be probed and attached only after the AT keyboard controller is
 * attached, we shall quietly reserve the IRQ resource for later use.
 * If the PS/2 mouse device is reported to us AFTER the keyboard controller,
 * copy the IRQ resource to the PS/2 mouse device instance hanging
 * under the keyboard controller, then probe and attach it.
 */

static	devclass_t			psmcpnp_devclass;

static	device_probe_t			psmcpnp_probe;
static	device_attach_t			psmcpnp_attach;

static device_method_t psmcpnp_methods[] = {
	DEVMETHOD(device_probe,		psmcpnp_probe),
	DEVMETHOD(device_attach,	psmcpnp_attach),
	
	{ 0, 0 }
};

static driver_t psmcpnp_driver = {
	PSMCPNP_DRIVER_NAME,
	psmcpnp_methods,
	1,			/* no softc */
};

static struct isa_pnp_id psmcpnp_ids[] = {
	{ 0x030fd041, "PS/2 mouse port" },		/* PNP0F03 */
	{ 0x130fd041, "PS/2 mouse port" },		/* PNP0F13 */
	{ 0x1303d041, "PS/2 port" },			/* PNP0313, XXX */
	{ 0x02002e4f, "Dell PS/2 mouse port" },		/* Lat. X200, Dell */
	{ 0x80374d24, "IBM PS/2 mouse port" },		/* IBM3780, ThinkPad */
	{ 0x81374d24, "IBM PS/2 mouse port" },		/* IBM3781, ThinkPad */
	{ 0x0190d94d, "SONY VAIO PS/2 mouse port"},     /* SNY9001, Vaio */
	{ 0x0290d94d, "SONY VAIO PS/2 mouse port"},	/* SNY9002, Vaio */
	{ 0x0390d94d, "SONY VAIO PS/2 mouse port"},	/* SNY9003, Vaio */
	{ 0x0490d94d, "SONY VAIO PS/2 mouse port"},     /* SNY9004, Vaio */
	{ 0 }
};

static int
create_a_copy(device_t atkbdc, device_t me)
{
	device_t psm;
	u_long irq;

	/* find the PS/2 mouse device instance under the keyboard controller */
	psm = device_find_child(atkbdc, PSM_DRIVER_NAME,
				device_get_unit(atkbdc));
	if (psm == NULL)
		return ENXIO;
	if (device_get_state(psm) != DS_NOTPRESENT)
		return 0;

	/* move our resource to the found device */
	irq = bus_get_resource_start(me, SYS_RES_IRQ, 0);
	bus_set_resource(psm, SYS_RES_IRQ, KBDC_RID_AUX, irq, 1);

	/* ...then probe and attach it */
	return device_probe_and_attach(psm);
}

static int
psmcpnp_probe(device_t dev)
{
	struct resource *res;
	u_long irq;
	int rid;

	if (ISA_PNP_PROBE(device_get_parent(dev), dev, psmcpnp_ids))
		return ENXIO;

	/*
	 * The PnP BIOS and ACPI are supposed to assign an IRQ (12)
	 * to the PS/2 mouse device node. But, some buggy PnP BIOS
	 * declares the PS/2 mouse device node without an IRQ resource!
	 * If this happens, we shall refer to device hints.
	 * If we still don't find it there, use a hardcoded value... XXX
	 */
	rid = 0;
	irq = bus_get_resource_start(dev, SYS_RES_IRQ, rid);
	if (irq <= 0) {
		if (resource_long_value(PSM_DRIVER_NAME,
					device_get_unit(dev), "irq", &irq) != 0)
			irq = 12;	/* XXX */
		device_printf(dev, "irq resource info is missing; "
			      "assuming irq %ld\n", irq);
		bus_set_resource(dev, SYS_RES_IRQ, rid, irq, 1);
	}
	res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
				     RF_SHAREABLE);
	bus_release_resource(dev, SYS_RES_IRQ, rid, res);

	/* keep quiet */
	if (!bootverbose)
		device_quiet(dev);

	return ((res == NULL) ? ENXIO : 0);
}

static int
psmcpnp_attach(device_t dev)
{
	device_t atkbdc;
	int rid;

	/* find the keyboard controller, which may be on acpi* or isa* bus */
	atkbdc = devclass_get_device(devclass_find(ATKBDC_DRIVER_NAME),
				     device_get_unit(dev));
	if ((atkbdc != NULL) && (device_get_state(atkbdc) == DS_ATTACHED)) {
		create_a_copy(atkbdc, dev);
	} else {
		/*
		 * If we don't have the AT keyboard controller yet,
		 * just reserve the IRQ for later use...
		 * (See psmidentify() above.)
		 */
		rid = 0;
		bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_SHAREABLE);
	}

	return 0;
}

/*
 * Return true if 'now' is earlier than (start + (secs.usecs)).
 * Now may be NULL and the function will fetch the current time from
 * getmicrouptime(), or a cached 'now' can be passed in.
 * All values should be numbers derived from getmicrouptime().
 */
static int
timeelapsed(start, secs, usecs, now)
	const struct timeval *start, *now;
	int secs, usecs;
{
	struct timeval snow, tv;

	/* if there is no 'now' passed in, the get it as a convience. */
	if (now == NULL) {
		getmicrouptime(&snow);
		now = &snow;
	}
	
	tv.tv_sec = secs;
	tv.tv_usec = usecs;
	timevaladd(&tv, start);
	return (timevalcmp(&tv, now, <));
}

DRIVER_MODULE(psmcpnp, isa, psmcpnp_driver, psmcpnp_devclass, 0, 0);
DRIVER_MODULE(psmcpnp, acpi, psmcpnp_driver, psmcpnp_devclass, 0, 0);