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/**
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 * struct tp_finger - single trackpad finger structure, le16-aligned
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 *
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 * @origin:    zero when switching track finger
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 * @abs_x:    absolute x coordinate
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 * @abs_y:    absolute y coordinate
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 * @rel_x:    relative x coordinate
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 * @rel_y:    relative y coordinate
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 * @tool_major:    tool area, major axis
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 * @tool_minor:    tool area, minor axis
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 * @orientation:  16384 when point, else 15 bit angle
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 * @touch_major:  touch area, major axis
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 * @touch_minor:  touch area, minor axis
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 * @unused:    zeros
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 * @pressure:    pressure on forcetouch touchpad
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 * @multi:    one finger: varies, more fingers: constant
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 * @crc16:    on last finger: crc over the whole message struct
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 *      (i.e. message header + this struct) minus the last
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 *      @crc16 field; unknown on all other fingers.
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 */
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struct tp_finger {
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  __le16 origin;
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  __le16 abs_x;
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  __le16 abs_y;
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  __le16 rel_x;
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  __le16 rel_y;
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  __le16 tool_major;
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  __le16 tool_minor;
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  __le16 orientation;
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  __le16 touch_major;
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  __le16 touch_minor;
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  __le16 unused[2];
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  __le16 pressure;
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  __le16 multi;
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  __le16 crc16;
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};
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/**
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 * struct touchpad_protocol - touchpad message.
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 * message.type = 0x0210
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 *
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 * @unknown1:    unknown
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 * @clicked:    1 if a button-click was detected, 0 otherwise
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 * @unknown2:    unknown
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 * @number_of_fingers:  the number of fingers being reported in @fingers
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 * @clicked2:    same as @clicked
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 * @unknown3:    unknown
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 * @fingers:    the data for each finger
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 */
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struct touchpad_protocol {
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  u8      unknown1[1];
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  u8      clicked;
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  u8      unknown2[28];
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  u8      number_of_fingers;
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  u8      clicked2;
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  u8      unknown3[16];
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  struct tp_finger  fingers[];
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};