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; This procedure is called when HID layer detects a new mouse.
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; This procedure is called when HID layer detects a new mouse.
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; in: ebx -> device_data from USB layer, edi -> collection
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; in: ebx -> device_data from USB layer, edi -> collection
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; out: eax = device-specific data or NULL on error
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; out: eax = device-specific data or NULL on error
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proc mouse_driver_add_device
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; Get screen resolution so we can calculate absolute coordinates.
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        mov     eax, 14
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        int     0x40
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        mov     [screen_y], eax
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        and     [screen_y], 0xffff
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        shr     eax, 16
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proc mouse_driver_add_device
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        mov     [screen_x], eax
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; Just allocate memory; no initialization needed.
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; Just allocate memory; no initialization needed.
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        movi    eax, sizeof.mouse_device_data
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        movi    eax, sizeof.mouse_device_data
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        call    Kmalloc
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        call    Kmalloc
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        ret
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        ret
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end if
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end if
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.x:
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.x:
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; 3. This is x moving. For relative fields, store the value in the state.
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; 3. This is x moving. For relative fields, store the value in the state.
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; Pass absolute field to the default handler.
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; Pass absolute field to the default handler.
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        jz      .unclaimed
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        jz      .relative_x
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        mov     [edi+mouse_device_data.dx], edx
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        mov     [edi+mouse_device_data.dx], edx
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        ret
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        ret
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.y:
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.y:
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; 4. This is y moving. For relative fields, store the value in the state,
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; 4. This is y moving. For relative fields, store the value in the state,
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; changing the sign: HID uses "mathematics" scheme with Y axis increasing from
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; changing the sign: HID uses "mathematics" scheme with Y axis increasing from
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; bottom to top, the kernel expects "programming" PS/2-style with Y axis
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; bottom to top, the kernel expects "programming" PS/2-style with Y axis
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; increasing from top to bottom.
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; increasing from top to bottom.
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; Pass absolute fields to the default handler.
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; Pass absolute fields to the default handler.
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        jz      .unclaimed
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        jz      .relative_y
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        neg     edx
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        neg     edx
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        mov     [edi+mouse_device_data.dy], edx
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        mov     [edi+mouse_device_data.dy], edx
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        ret
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        ret
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.wheel:
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.wheel:
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; 5. This is wheel event. For relative fields, store the value in the state,
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; 5. This is wheel event. For relative fields, store the value in the state,
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.hwheel:
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.hwheel:
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        test    byte [esi+report_field_group.flags], HID_FIELD_RELATIVE
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        jz      .unclaimed
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        jz      .unclaimed
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        mov     [edi+mouse_device_data.hwheel], edx
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        mov     [edi+mouse_device_data.hwheel], edx
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        ret
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        ret
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.relative_x:
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        push    ebx
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        mov     eax, [screen_x]
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        mul     edx
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        mov     ebx, 0x8000
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        div     ebx
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        mov     [edi+mouse_device_data.dx], eax
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        or      [edi+mouse_device_data.buttons], 0x80000000
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        pop     ebx
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        ret
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.relative_y:
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        push    ebx
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        mov     eax, [screen_y]
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        mul     edx
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        mov     ebx, 0x8000
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        div     ebx
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        mov     [edi+mouse_device_data.dy], eax
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        or      [edi+mouse_device_data.buttons], 0x40000000
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        pop     ebx
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        ret
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endp
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endp
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; This procedure is called when HID layer ends processing a new input packet
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; This procedure is called when HID layer ends processing a new input packet
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; from a mouse.
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; from a mouse.