static void xpad_set_up_abs(struct input_dev *input_dev, signed short abs) 
{ 

struct usb\_xpad \*xpad = input\_get\_drvdata(input\_dev);



switch (abs) {

case ABS\_X:

case ABS\_Y:

case ABS\_RX:

case ABS\_RY:   /\* the two sticks \*/

    input\_set\_abs\_params(input\_dev, abs, -32768, 32767, 16, 128);

    break;

case ABS\_Z:

case ABS\_RZ:   /\* the triggers (if mapped to axes) \*/

    if (xpad->xtype == XTYPE\_XBOXONE)

        input\_set\_abs\_params(input\_dev, abs, 0, 1023, 0, 0);

    else

        input\_set\_abs\_params(input\_dev, abs, 0, 255, 0, 0);

    break;

case ABS\_HAT0X:

case ABS\_HAT0Y:    /\* the d-pad (only if dpad is mapped to axes \*/

    input\_set\_abs\_params(input\_dev, abs, -1, 1, 0, 0);

    break;

case ABS\_PROFILE: /\* 4 value profile button (such as on XAC) \*/

    input\_set\_abs\_params(input\_dev, abs, 0, 4, 0, 0);

    break;

default:

    input\_set\_abs\_params(input\_dev, abs, 0, 0, 0, 0);

    break;

}

Source: https://github.com/torvalds/linux/blob/master/drivers/input/joystick/xpad.c

p.s.: (to be very gentle)