usbms - USB mouse STREAMS module


#include <sys/vuid_event.h>

#include <sys/vuid_wheel.h>

#include <sys/msio.h>

#include <sys/msreg.h>


The usbms STREAMS module processes byte streams generated by a USB mouse.
A USB mouse is a member of the Human Interface Device (HID) class and the
usbms module supports only the mouse boot protocol defined in the HID

The usbms module must be pushed on top of the HID class driver (see
hid(4D)). In the VUID_FIRM_EVENT mode, the usbms module translates
packets from the USB mouse into Firm events. The Firm event structure is
defined in <sys/vuid_event.h>. The STREAMS module state is initially set
to raw or VUID_NATIVE mode which performs no message processing. See the
HID 1.0 specification for the raw format of the mouse packets. To
initiate mouse protocol conversion to Firm events, change the state to

When the usb mouse is opened or hot plugged in, the MOUSE_TYPE_ABSOLUTE
event (Firm event) is sent to the upper level to notify the VUID
application that it is the absolute mouse.


This option returns the current state of the STREAMS
module. The state of the usbms STREAMS module may be
either VUID_NATIVE (no message processing) or
VUID_FIRM_EVENT (convert to Firm events).

The argument is a pointer to an int. Set the state of the
STREAMS module to the int pointed to by the argument.

typedef struct vuid_addr_probe {
short base; /* default vuid device addr directed too */
union {
short next; /* next addr for default when VUIDSADDR */
short current; /* current addr of default when VUIDGADDR */
} data;
} Vuid_addr_probe;

The argument is a pointer to a Vuid_addr_probe structure.
VUIDSADDR sets the virtual input device segment address
indicated by base to next.

If base does not equal VKEY_FIRST, ENODEV is returned.

The argument is a pointer to a Vuid_addr_probe structure.
Return the address of the virtual input device segment
indicated by base to current.

If base does not equal VKEY_FIRST, ENODEV is returned.


This ioctl takes a pointer to an integer as argument and sets the
value of the integer to the number of wheels available on this
device. This ioctl returns 1 if wheel(s) are present and zero if no
wheels are present.


This command returns static information about the wheel that does not
change while a device is in use. Currently the only information
defined is the wheel orientation which is either
module cannot distinguish the orientation of the wheel or the wheel
is of some other format, the format is set to

typedef struct {
int vers;
int id;
int format;
} wheel_info;

The ioctl takes a pointer to "wheel_info" structure with the "vers"
set to the current version of the "wheel_info" structure and "id" set
to the id of the wheel for which the information is desired.


VUIDSWHEELSTATE sets the state of the wheel to that specified in the
stateflags. VUIDGWHEELSTATE returns the current state settings in the
stateflags field.

stateflags is an OR'ed set of flag bits. The only flag currently

When stateflags is set to VUID_WHEEL_STATE_ENABLED the module
converts motion of the specified wheel into VUID events and sends
those up stream.

Wheel events are enabled by default.

Applications that want to change the stateflags should first get the
current stateflags and then change only the bit they want.

typedef struct {
int vers;
int id;
uint32_t stateflags;
} wheel_state;

These ioctls take a pointer to "wheel_state" as an argument with the
"vers" and "id" members filled in. These members have the same
meaning as that for 'VUIDGWHEEL INFO' ioctl.

ioctl() requests for changing and retrieving mouse parameters use the
Ms_parms structure:

typedef struct {
int jitter_thresh;
int speed_law;
int speed_limit;
} Ms_parms;

jitter_thresh is the "jitter threshold" of the mouse. Motions fewer than
jitter_thresh units along both axes are accumulated and then sent up the
stream after 1/12 second.

speed_law indicates whether extremely large motions are to be ignored. If
it is 1, a "speed limit" is applied to mouse motions. Motions along
either axis of more than speed_limit units are discarded.

The argument is a pointer to a Ms_params structure.
The usbms module parameters are returned in the

The argument is a pointer to a Ms_params structure.
The usbms module parameters are set according to the
values in the structure.

Used by the absolute mouse to get the current screen
resolution. The parameter is a pointer to the
Ms_screen_resolution structure:

int height; /* height of the screen */
int width; /* width of the screen */

The usbms module parameters are set according to the
values in the structure and used to calculate the
correct coordinates.



32-bit ELF kernel STREAMS module (x86 platform only.)


SPARC 64-bit ELF kernel STREAMS module


See attributes(7) for a description of the following attributes:

|Architecture | PCI-based systems |


ioctl(2), hid(4D), usba(4D), virtualkm(4D), attributes(7)

System Administration Guide: Basic Administration


The following messages may be logged into the system log. They are
formatted in the following manner:

<device path><usbms<instance number>): message...

Invalid Hid descriptor tree. Set to default value (3 buttons).

The mouse supplied incorrect information in its HID report.

Mouse buffer flushed when overrun.

Mouse data was lost.

May 13, 2017 USBMS(4M)