static int usb_msd_handle_control(USBDevice *dev, int request, int value, int index, int length, uint8_t *data) { MSDState *s = (MSDState *)dev; int ret; ret = usb_desc_handle_control(dev, request, value, index, length, data); if (ret >= 0) { return ret; } ret = 0; switch (request) { case DeviceRequest | USB_REQ_GET_STATUS: data[0] = (1 << USB_DEVICE_SELF_POWERED) | (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP); data[1] = 0x00; ret = 2; break; case DeviceOutRequest | USB_REQ_CLEAR_FEATURE: if (value == USB_DEVICE_REMOTE_WAKEUP) { dev->remote_wakeup = 0; } else { goto fail; } ret = 0; break; case DeviceOutRequest | USB_REQ_SET_FEATURE: if (value == USB_DEVICE_REMOTE_WAKEUP) { dev->remote_wakeup = 1; } else { goto fail; } ret = 0; break; case DeviceRequest | USB_REQ_GET_CONFIGURATION: data[0] = 1; ret = 1; break; case DeviceOutRequest | USB_REQ_SET_CONFIGURATION: ret = 0; break; case DeviceRequest | USB_REQ_GET_INTERFACE: data[0] = 0; ret = 1; break; case DeviceOutRequest | USB_REQ_SET_INTERFACE: ret = 0; break; case EndpointOutRequest | USB_REQ_CLEAR_FEATURE: ret = 0; break; case InterfaceOutRequest | USB_REQ_SET_INTERFACE: ret = 0; break; /* Class specific requests. */ case ClassInterfaceOutRequest | MassStorageReset: /* Reset state ready for the next CBW. */ s->mode = USB_MSDM_CBW; ret = 0; break; case ClassInterfaceRequest | GetMaxLun: data[0] = 0; ret = 1; break; default: fail: ret = USB_RET_STALL; break; } return ret; }