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.interface      dd      ?       ; pointer to usb_interface_descr
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.interface      dd      ?       ; pointer to usb_interface_descr
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end virtual
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end virtual
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; 1. Check that the maximal nesting is not exceeded:
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; 1. Check that the maximal nesting is not exceeded:
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; 5 non-root hubs is the maximum according to the spec.
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; 5 non-root hubs is the maximum according to the spec.
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        mov     ebx, [.pipe]
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        mov     ebx, [.pipe]
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        movi    ecx, 5
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        push    5
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        mov     eax, ebx
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        mov     eax, ebx
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.count_parents:
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.count_parents:
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        mov     eax, [eax+usb_pipe.DeviceData]
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        mov     eax, [eax+usb_pipe.DeviceData]
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        mov     eax, [eax+usb_device_data.Hub]
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        mov     eax, [eax+usb_device_data.Hub]
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        test    eax, eax
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        test    eax, eax
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        jz      .depth_ok
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        jz      .depth_ok
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        mov     eax, [eax+usb_hub.ConfigPipe]
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        mov     eax, [eax+usb_hub.ConfigPipe]
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        dec     ecx
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        dec     dword [esp]
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        jnz     .count_parents
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        jnz     .count_parents
- 
 
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        pop     eax
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        dbgstr 'Hub chain is too long'
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        dbgstr 'Hub chain is too long'
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        jmp     .return0
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        jmp     .return0
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.depth_ok:
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.depth_ok:
- 
 
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        pop     eax
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; Hubs use one IN interrupt endpoint for polling the device
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; Hubs use one IN interrupt endpoint for polling the device
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; 2. Locate the descriptor of the interrupt endpoint.
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; 2. Locate the descriptor of the interrupt endpoint.
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; Loop over all descriptors owned by this interface.
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; Loop over all descriptors owned by this interface.
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.lookep:
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.lookep:
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; 2a. Skip the current descriptor.
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; 2a. Skip the current descriptor.