Linuxinputsubsystem virtual keyboard and mouse

Article Title: linuxinputsubsystem virtual keyboard and mouse. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

1 event device

In/dev/input/event?

Cat data from/dev/input/event? The data format is:

Struct input_event {

Struct timeval time;

_ 2010type;

_ 2010code;

_ S32 value;

};

E. g:

Xx yy tt cc vv

Xx is usec

Yy is sec

Tt is type

Cc is key code

Vv is value, might be it means keyup or keydown

For mouse event, you can get the same message format

Xx, yy is the same as keyboard

Tt is EV_REL, it means the value feild is relative distance;

Cc is REL_X or REL_Y

Vv is the value of relative distance

2 register input_dev

/**************************

For virtual mouse

**/

Static int vkm_vmouse_register (void)

{

Struct input_dev * vmouse_dev;

Vmouse_dev = input_allocate_device ();

If (! Vmouse_dev)

Return-ENOMEM;

Vmouse_dev-> name = "VMouse ";

Vmouse_dev-> phys = "xxmouse/input1 ";

Vmouse_dev-> id. bustype = BUS_HOST;

Vmouse_dev-> id. vendor = 0x0001;

Vmouse_dev-> id. product = 0x0002;

Vmouse_dev-> id. version = 0x0100;

Vmouse_dev-> evbit [0] = BIT_MASK (EV_KEY) | BIT_MASK (EV_REL );

Vmouse_dev-> keybit [BIT_WORD (BTN_MOUSE)] =

BIT_MASK (BTN_LEFT) | BIT_MASK (BTN_RIGHT );

Vmouse_dev-> relbit [0] = BIT_MASK (REL_X) | BIT_MASK (REL_Y );

/* Error check */

Error = input_register_device (vmouse_dev );

If (error ){

Input_free_device (vmouse_dev );

Return error;

}

}

/**************************

For virtual keyboard

**/

Static int vkm_vkbd_register (void)

{

Int I, error;

Struct input_dev * vkbd_dev;

Vkbd_dev = input_allocate_device ();

If (! Vkbd_dev)

Return-ENOMEM;

Vkbd_dev-> name = "VKBD Keyboard ";

Vkbd_dev-> phys = "atakbd/input0 ";

Vkbd_dev-> id. bustype = BUS_HOST;

Vkbd_dev-> id. vendor = 0x0001;

Vkbd_dev-> id. product = 0x0001;

Vkbd_dev-> id. version = 0x0100;

Vkbd_dev-> evbit [0] = BIT_MASK (EV_KEY) | BIT_MASK (EV_REP );

Vkbd_dev-> keycode = atakbd_keycode;

Vkbd_dev-> keycodesize = sizeof (unsigned char );

Vkbd_dev-> keycodemax = ARRAY_SIZE (atakbd_keycode );

For (I = 1; I <0x72; I ++ ){

Set_bit (atakbd_keycode [I], vkbd_dev-> keybit );

}

/* Error check */

Error = input_register_device (vkbd_dev );

If (error ){

Input_free_device (vkbd_dev );

Return error;

}

Return 0;

}

Send keyboard event to input handler like this:

Input_report_key (vkbd_dev, KEY_A, 0 );

Input_sync (vkbd_dev );

And send mouse event to input handler like this:

Input_report_rel (vmouse_dev, REL_X, 10 );

Input_report_rel (vmouse_dev, REL_Y, 10 );

Input_sync (vmouse_dev );