NAME

wsmouse, wsmouse_input, wsmousedevprint — wscons mouse support

SYNOPSIS

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsmousevar.h>

void
wsmouse_input(struct device *msdev, u_int btns, int x, int y, int z, int w, u_int flags);

int
wsmousedevprint(void *aux, const char *pnp);

DESCRIPTION

The wsmouse module is a component of the wscons(9) framework to provide machine-independent mouse support. Most of the support is provided by the wsmouse(4) device driver, which must be a child of the hardware device driver.

DATA TYPES

Mouse drivers providing support for wscons pointer devices will make use of the following data types:

struct wsmouse_accessops

A structure used to specify the mouse access functions. All pointer devices must provide this structure and pass it to the wsmouse(4) child device. It has the following members:

	int	(*enable)(void *);
	int	(*ioctl)(void *v, u_long cmd, void *data,
			int flag, struct lwp *l);
	void	(*disable)(void *);

The enable member defines the function to be called to enable monitoring pointer movements and passing these events to wscons. The disable member defines the function to disable movement events. The ioctl member defines the function to be called to perform mouse-specific ioctl calls.

There is a void * cookie provided by the mouse driver associated with these functions, which is passed to them when they are invoked.

struct wsmousedev_attach_args

A structure used to attach the wsmouse(4) child device. It has the following members:

	const struct wsmouse_accessops *accessops;
	void *accesscookie;

FUNCTIONS

wsmouse_input(msdev, btns, x, y, z, w, flags)

Callback from the mouse driver to the wsmouse interface driver. Arguments are as follows:

msdev

This is the struct device pointer passed from config_found() on attaching the child wsmouse(4) to specify the mouse device.

btns

This specifies the current button status. Bits for pressed buttons (which will cause the WSCONS_EVENT_MOUSE_DOWN event on wsmouse(4) device) should be set, and bits for released buttons (which will cause the WSCONS_EVENT_MOUSE_UP event) should be zero. The left most button state should be in LSB, i.e. for typical three button mouse, the left button is 0x01, the middle button is 0x02, and the right button is 0x04.

x

Absolute or relative X-axis value to specify the pointer coordinate. Rightward (moving the mouse right) is positive.

y

Absolute or relative Y-axis value to specify the pointer coordinate. Upward (moving the mouse forward) is positive. Note that this aspect is opposite from the one used in the X server dix layer.

z

Absolute or relative Z-axis value to specify the pointer coordinate. Usually this axis is used for the wheel. Downward (turning the wheel backward) is positive.

w

Absolute or relative W-axis value to specify the pointer coordinate. Usually this axis would be used for the horizontal component of the wheel.

flags

This argument specifies whether the pointer device and the measurement of the x, y, z, and w axes is in relative or absolute mode. Valid values for flags are:

WSMOUSE_INPUT_DELTA: Relative mode.
WSMOUSE_INPUT_ABSOLUTE_X: Absolute mode in x axis.
WSMOUSE_INPUT_ABSOLUTE_Y: Absolute mode in y axis.
WSMOUSE_INPUT_ABSOLUTE_Z: Absolute mode in z axis.
WSMOUSE_INPUT_ABSOLUTE_W: Absolute mode in w axis.

wsmouse_precision_scroll(msdev, x, y)

Callback from the mouse driver to the wsmouse interface driver.

This is used when higher precision scrolling events are required than what can be provided by a typical scroll wheel. This function generates WSCONS_EVENT_HSCROLL (for scrolling on the X axis) and WSCONS_EVENT_VSCROLL (for scrolling on the X axis) events.

The coordinates are adjusted for speed according to the formula: x * 4096 / scroll_unit

The scroll_unit is configured through the wsmouse(4) ioctl interface, specifically the WSMOUSEIO_SETPARAMS keys WSMOUSECFG_HORIZSCROLLDIST and WSMOUSECFG_VERTSCROLLDIST.

wsmousedevprint(aux, pnp)

The default wsmouse printing routine used by config_found(). (see autoconf(9)).

AUTOCONFIGURATION

Mouse drivers which want to use the wsmouse module must be a parent to the wsmouse(4) device and provide an attachment interface. To attach the wsmouse(4) device, the mouse driver must allocate and populate a wsmousedev_attach_args structure with the supported operations and callbacks and call config_found() to perform the attach (see autoconf(9)).

OPERATION

When a mouse-movement event is received, the device driver must perform any necessary movement decoding to wscons events and pass the events to wscons via wsmouse_input().

The wscons framework calls back into the hardware driver by invoking the functions that are specified in the accessops structure. The enable() and disable() functions are relatively simple and self-explanatory. The ioctl() function is called by the wscons interface to perform mouse-specific ioctl operations (see ioctl(2)). The argument cmd to the ioctl() function specifies the specific command to perform using the data data. Valid commands are listed in sys/dev/wscons/wsconsio.h.

CODE REFERENCES

The wscons subsystem is implemented within the directory sys/dev/wscons. The wsmouse module itself is implemented within the file sys/dev/wscons/wsmouse.c. ioctl(2) operations are listed in sys/dev/wscons/wsconsio.h.