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NAME

     mse -- bus and InPort mice driver

SYNOPSIS

     device mse

     In /boot/device.hints:
     hint.mse.0.at="isa"
     hint.mse.0.port="0x23c"
     hint.mse.0.irq="5"

DESCRIPTION

     The mse driver provides support for the bus mouse and the InPort mouse,
     which are often collectively called ``bus'' mice, as these mice are sold
     with an interface card which needs to be installed in an expansion bus
     slot.  The interface circuit may come on an integrated I/O card or as an
     option on video cards.

     The bus and InPort mice have two or three buttons, and a D-sub 9-pin male
     connector or a round DIN 9-pin male connector.

     The primary port address of the bus and InPort mouse interface cards is
     usually 0x23c.  Some cards may also be set to use the secondary port
     address at 0x238.  The interface cards require a single IRQ, which may be
     2, 3, 4 or 5.  Some cards may offer additional IRQs.  The port number and
     the IRQ number are configured by jumpers on the cards or by software
     provided with the card.

     Frequency, or report rate, at which the device sends movement and button
     state reports to the host system, may also be configurable on some
     interface cards.  It may be 15, 30, 60 or 120Hz.

     The difference between the two types of the mice is not in mouse devices
     (in fact they are exactly the same).  But in the circuit on the interface
     cards.  This means that the device from a bus mouse package can be
     connected to the interface card from an InPort mouse package, or vice
     versa, provided that their connectors match.

   Operation Levels
     The mse driver has two levels of operation.  The current operation level
     can be set via an ioctl call.

     At the level zero the basic support is provided; the device driver will
     report horizontal and vertical movement of the attached device and state
     of up to three buttons in the format described below.  It is a subset of
     the MouseSystems protocol.

     Byte 1
             bit 7  Always one.
             bit 6..3
                    Always zero.
             bit 2  Left button status; cleared if pressed, otherwise set.
             bit 1  Middle button status; cleared if pressed, otherwise set.
                    Always one, if the device does not have the middle button.
             bit 0  Right button status; cleared if pressed, otherwise set.
     Byte 2  Horizontal movement count in two's compliment; -128 through 127.
     Byte 3  Vertical movement count in two's compliment; -128 through 127.
     Byte 4  Always zero.
     Byte 5  Always zero.

     This is the default level of operation and the driver is initially at
     this level when opened by the user program.

     At the operation level one (extended level), a data packet is encoded in
     the standard format MOUSE_PROTO_SYSMOUSE as defined in mouse(4).

   Acceleration
     The mse driver can somewhat `accelerate' the movement of the pointing
     device.  The faster you move the device, the further the pointer travels
     on the screen.  The driver has an internal variable which governs the
     effect of the acceleration.  Its value can be modified via the driver
     flag or via an ioctl call.

   Device Number
     The minor device number of the mse is made up of:

           minor = (`unit' << 1) | `non-blocking'

     where `unit' is the device number (usually 0) and the `non-blocking' bit
     is set to indicate ``do not block waiting for mouse input, return
     immediately''.  The `non-blocking' bit should be set for XFree86,
     therefore the minor device number usually used for XFree86 is 1.  See
     FILES for device node names.

DRIVER CONFIGURATION

   Driver Flags
     The mse driver accepts the following driver flag.  Set it in the kernel
     configuration file (see config(8)) or in the User Configuration Menu at
     the boot time (see boot(8)).

     bit 4..7 ACCELERATION
            This flag controls the amount of acceleration effect.  The smaller
            the value of this flag is, more sensitive the movement becomes.
            The minimum value allowed, thus the value for the most sensitive
            setting, is one.  Setting this flag to zero will completely
            disables the acceleration effect.

IOCTLS

     There are a few ioctl(2) commands for mouse drivers.  These commands and
     related structures and constants are defined in <sys/mouse.h>.  General
     description of the commands is given in mouse(4).  This section explains
     the features specific to the mse driver.

     MOUSE_GETLEVEL int *level
     MOUSE_SETLEVEL int *level
            These commands manipulate the operation level of the mse driver.

     MOUSE_GETHWINFO mousehw_t *hw
            Returns the hardware information of the attached device in the
            following structure.  Only the iftype field is guaranteed to be
            filled with the correct value by the current version of the mse
            driver.

            typedef struct mousehw {
                int buttons;    /* number of buttons */
                int iftype;     /* I/F type */
                int type;       /* mouse/track ball/pad... */
                int model;      /* I/F dependent model ID */
                int hwid;       /* I/F dependent hardware ID */
            } mousehw_t;

            The buttons field holds the number of buttons on the device.

            The iftype is either MOUSE_IF_BUS or MOUSE_IF_INPORT.

            The type may be MOUSE_MOUSE, MOUSE_TRACKBALL, MOUSE_STICK,
            MOUSE_PAD, or MOUSE_UNKNOWN.

            The model is always MOUSE_MODEL_GENERIC at the operation level 0.
            It may be MOUSE_MODEL_GENERIC or one of MOUSE_MODEL_XXX constants
            at higher operation levels.

            The hwid is always 0.

     MOUSE_GETMODE mousemode_t *mode
            The command gets the current operation parameters of the mouse
            driver.

            typedef struct mousemode {
                int protocol;    /* MOUSE_PROTO_XXX */
                int rate;        /* report rate (per sec), -1 if unknown */
                int resolution;  /* MOUSE_RES_XXX, -1 if unknown */
                int accelfactor; /* acceleration factor */
                int level;       /* driver operation level */
                int packetsize;  /* the length of the data packet */
                unsigned char syncmask[2]; /* sync. bits */
            } mousemode_t;

            The protocol is either MOUSE_PROTO_BUS or MOUSE_PROTO_INPORT at
            the operation level zero.  MOUSE_PROTO_SYSMOUSE at the operation
            level one.

            The rate is the status report rate (reports/sec) at which the
            device will send movement report to the host computer.  As there
            is no standard to detect the current setting, this field is always
            set to -1.

            The resolution is always set to -1.

            The accelfactor field holds a value to control acceleration
            feature (see Acceleration).  It is zero or greater.  If it is
            zero, acceleration is disabled.

            The packetsize field specifies the length of the data packet.  It
            depends on the operation level.

            level 0    5 bytes
            level 1    8 bytes

            The array syncmask holds a bit mask and pattern to detect the
            first byte of the data packet.  syncmask[0] is the bit mask to be
            ANDed with a byte.  If the result is equal to syncmask[1], the
            byte is likely to be the first byte of the data packet.  Note that
            this detection method is not 100% reliable, thus, should be taken
            only as an advisory measure.

            Only level and accelfactor are modifiable by the MOUSE_SETMODE
            command.  Changing the other field does not cause error, but has
            no effect.

     MOUSE_SETMODE mousemode_t *mode
            The command changes the current operation parameters of the mouse
            driver as specified in mode.  Only level and accelfactor may be
            modifiable.  Setting values in the other field does not generate
            error and has no effect.

     MOUSE_READDATA mousedata_t *data
     MOUSE_READSTATE mousedata_t *state
            These commands are not supported by the mse driver.

     MOUSE_GETSTATUS mousestatus_t *status
            The command returns the current state of buttons and movement
            counts as described in mouse(4).

FILES

     /dev/mse0   `non-blocking' device node in the system without devfs,
                 `blocking' under devfs.
     /dev/nmse0  `non-blocking' device node under devfs.

EXAMPLES

           device mse

     In /boot/device.hints:
           hint.mse.0.at="isa"
           hint.mse.0.port="0x23c"
           hint.mse.0.irq="5"

     Add the mse driver at the primary port address with the IRQ 5.

           device mse

           hint.mse.1.at="isa"
           hint.mse.1.port="0x238"
           hint.mse.1.irq="4"
           hint.mse.1.flags="0x30"

     Define the mse driver at the secondary port address with the IRQ 4 and
     the acceleration factor of 3.

CAVEATS

     Some bus mouse interface cards generate interrupts at the fixed report
     rate when enabled, whether or not the mouse state is changing.  The
     others generate interrupts only when the state is changing.

SEE ALSO

     ioctl(2), mouse(4), psm(4), sysmouse(4), moused(8)