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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.
SEE ALSO
ioctl(2), mouse(4), psm(4), sysmouse(4), moused(8)
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.