SYSMOUSE(4) FreeBSD Kernel Interfaces Manual SYSMOUSE(4)
NAME
sysmouse - virtualized mouse driver
SYNOPSIS
#include <sys/mouse.h>
#include <sys/consio.h>
DESCRIPTION
The console driver, in conjunction with the mouse daemon moused(8),
supplies mouse data to the user process in the standardized way via the
sysmouse driver. This arrangement makes it possible for the console and
the user process (such as the X Window System) to share the mouse.
The user process which wants to utilize mouse operation simply opens
/dev/sysmouse with a open(2) call and reads mouse data from the device
via read(2). Make sure that moused(8) is running, otherwise the user
process will not see any data coming from the mouse.
Operation Levels
The sysmouse driver has two levels of operation. The current operation
level can be referred to and changed via ioctl calls.
The level zero, the basic level, is the lowest level at which the driver
offers the basic service to user programs. The sysmouse driver provides
horizontal and vertical movement of the mouse and state of up to three
buttons in the MouseSystems format as follows.
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 The first half of horizontal movement count in two's complement;
-128 through 127.
Byte 3 The first half of vertical movement count in two's complement;
-128 through 127.
Byte 4 The second half of the horizontal movement count in two's
complement; -128 through 127. To obtain the full horizontal
movement count, add the byte 2 and 4.
Byte 5 The second half of the vertical movement count in two's
complement; -128 through 127. To obtain the full vertical
movement count, add the byte 3 and 5.
At the level one, the extended level, mouse data is encoded in the
standard format MOUSE_PROTO_SYSMOUSE as defined in mouse(4).
IOCTLS
This section describes two classes of ioctl(2) commands: commands for the
sysmouse driver itself, and commands for the console and the console
control drivers.
Sysmouse Ioctls
There are a few commands for mouse drivers. General description of the
commands is given in mouse(4). Following are the features specific to
the sysmouse driver.
MOUSE_GETLEVEL int *level
MOUSE_SETLEVEL int *level
These commands manipulate the operation level of the mouse 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 in the current version of the
sysmouse 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 detected by the
driver.
The iftype is always MOUSE_IF_SYSMOUSE.
The type tells the device type: 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 zero.
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) */
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 field tells the format in which the device status is
returned when the mouse data is read by the user program. It is
MOUSE_PROTO_MSC at the operation level zero. MOUSE_PROTO_SYSMOUSE
at the operation level one.
The rate is always set to -1.
The resolution is always set to -1.
The accelfactor is always 0.
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 method of detecting the first byte is not 100% reliable;
thus, it should be taken only as an advisory measure.
MOUSE_SETMODE mousemode_t *mode
The command changes the current operation parameters of the mouse
driver as specified in mode. Only level 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 sysmouse driver.
MOUSE_GETSTATUS mousestatus_t *status
The command returns the current state of buttons and movement
counts in the structure as defined in mouse(4).
Console and Consolectl Ioctls
The user process issues console ioctl() calls to the current virtual
console in order to control the mouse pointer. The console ioctl() also
provides a method for the user process to receive a signal(3) when a
button is pressed.
The mouse daemon moused(8) uses ioctl() calls to the console control
device /dev/consolectl to inform the console of mouse actions including
mouse movement and button status.
Both classes of ioctl() commands are defined as CONS_MOUSECTL which takes
the following argument.
struct mouse_info {
int operation;
union {
struct mouse_data data;
struct mouse_mode mode;
struct mouse_event event;
} u;
};
operation This can be one of
MOUSE_SHOW Enables and displays mouse cursor.
MOUSE_HIDE Disables and hides mouse cursor.
MOUSE_MOVEABS Moves mouse cursor to position supplied in
u.data.
MOUSE_MOVEREL Adds position supplied in u.data to current
position.
MOUSE_GETINFO Returns current mouse position in the current
virtual console and button status in u.data.
MOUSE_MODE This sets the signal(3) to be delivered to the
current process when a button is pressed. The
signal to be delivered is set in u.mode.
The above operations are for virtual consoles. The operations
defined below are for the console control device and are used
by moused(8) to pass mouse data to the console driver.
MOUSE_ACTION
MOUSE_MOTION_EVENT
These operations take the information in u.data
and act upon it. Mouse data will be sent to
the sysmouse driver if it is open.
MOUSE_ACTION also processes button press
actions and sends signal to the process if
requested or performs cut and paste operations
if the current console is a text interface.
MOUSE_BUTTON_EVENT
u.data specifies a button and its click count.
The console driver will use this information
for signal delivery if requested or for cut and
paste operations if the console is in text
mode.
MOUSE_MOTION_EVENT and MOUSE_BUTTON_EVENT are newer interface
and are designed to be used together. They are intended to
replace functions performed by MOUSE_ACTION alone.
u This union is one of
data
struct mouse_data {
int x;
int y;
int z;
int buttons;
};
x, y and z represent movement of the mouse along
respective directions. buttons tells the state of
buttons. It encodes up to 31 buttons in the bit 0
though the bit 30. If a button is held down, the
corresponding bit is set.
mode
struct mouse_mode {
int mode;
int signal;
};
The signal field specifies the signal to be delivered to
the process. It must be one of the values defined in
<signal.h>. The mode field is currently unused.
event
struct mouse_event {
int id;
int value;
};
The id field specifies a button number as in
u.data.buttons. Only one bit/button is set. The value
field holds the click count: the number of times the
user has clicked the button successively.
FILES
/dev/consolectl device to control the console
/dev/sysmouse virtualized mouse driver
/dev/ttyv%d virtual consoles
SEE ALSO
vidcontrol(1), ioctl(2), signal(3), mouse(4), moused(8)
HISTORY
The sysmouse driver first appeared in FreeBSD 2.2.
AUTHORS
This manual page was written by John-Mark Gurney <jmg@FreeBSD.org> and
Kazutaka Yokota <yokota@FreeBSD.org>.
FreeBSD 13.1-RELEASE-p6 March 25, 2014 FreeBSD 13.1-RELEASE-p6
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