i2c_add_adapter
ret = i2c_add_adapter(&aux->ddc);
return i2c_add_adapter(&aux->ddc);
ret = i2c_add_adapter(&bus->adapter);
return i2c_add_adapter(&ddc->ddc);
ret = i2c_add_adapter(&i2c->adapter);
ret = i2c_add_adapter(&i2c->adapter);