/* $Id: VUSBInternal.h 62294 2016-07-18 10:12:57Z vboxsync $ */ /** @file * Virtual USB - Internal header. * * This subsystem implements USB devices in a host controller independent * way. All the host controller code has to do is use VUSBHUB for its * root hub implementation and any emulated USB device may be plugged into * the virtual bus. */ /* * Copyright (C) 2006-2015 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. */ #ifndef ___VUSBInternal_h #define ___VUSBInternal_h #include #include #include #include #include #include #include #include #include #include #include #include #include "VUSBSniffer.h" RT_C_DECLS_BEGIN /** @name Internal Device Operations, Structures and Constants. * @{ */ /** Pointer to a Virtual USB device (core). */ typedef struct VUSBDEV *PVUSBDEV; /** Pointer to a VUSB hub device. */ typedef struct VUSBHUB *PVUSBHUB; /** Pointer to a VUSB root hub. */ typedef struct VUSBROOTHUB *PVUSBROOTHUB; /** Number of the default control endpoint */ #define VUSB_PIPE_DEFAULT 0 /** @name Device addresses * @{ */ #define VUSB_DEFAULT_ADDRESS 0 #define VUSB_INVALID_ADDRESS UINT8_C(0xff) /** @} */ /** @name Feature bits (1<abData[0]. */ PVUSBSETUP pMsg; /** Current DATA pointer. * This starts at pMsg + 1 and is incremented at we read/write data. */ uint8_t *pbCur; /** The amount of data left to read on IN operations. * On OUT operations this is not used. */ uint32_t cbLeft; /** The amount of data we can house. * This starts at the default 8KB, and this structure will be reallocated to * accommodate any larger request (unlikely). */ uint32_t cbMax; /** The message URB. */ VUSBURB Urb; } VUSBCTRLEXTRA, *PVUSBCTRLEXTRA; void vusbMsgFreeExtraData(PVUSBCTRLEXTRA pExtra); void vusbMsgResetExtraData(PVUSBCTRLEXTRA pExtra); /** Opaque VUSB buffered pipe management handle. */ typedef struct VUSBBUFFEREDPIPEINT *VUSBBUFFEREDPIPE; /** Pointer to a VUSB buffered pipe handle. */ typedef VUSBBUFFEREDPIPE *PVUSBBUFFEREDPIPE; /** * A VUSB pipe */ typedef struct vusb_pipe { PCVUSBDESCENDPOINTEX in; PCVUSBDESCENDPOINTEX out; /** Pointer to the extra state data required to run a control pipe. */ PVUSBCTRLEXTRA pCtrl; /** Critical section serializing access to the extra state data for a control pipe. */ RTCRITSECT CritSectCtrl; /** Count of active async transfers. */ volatile uint32_t async; /** Pipe buffer - only valid for isochronous endpoints. */ VUSBBUFFEREDPIPE hBuffer; } VUSBPIPE; /** Pointer to a VUSB pipe structure. */ typedef VUSBPIPE *PVUSBPIPE; /** * Interface state and possible settings. */ typedef struct vusb_interface_state { /** Pointer to the interface descriptor of the currently selected (active) * interface. */ PCVUSBDESCINTERFACEEX pCurIfDesc; /** Pointer to the interface settings. */ PCVUSBINTERFACE pIf; } VUSBINTERFACESTATE; /** Pointer to interface state. */ typedef VUSBINTERFACESTATE *PVUSBINTERFACESTATE; /** Pointer to const interface state. */ typedef const VUSBINTERFACESTATE *PCVUSBINTERFACESTATE; /** * VUSB URB pool. */ typedef struct VUSBURBPOOL { /** Critical section protecting the pool. */ RTCRITSECT CritSectPool; /** Chain of free URBs by type. (Singly linked) */ RTLISTANCHOR aLstFreeUrbs[VUSBXFERTYPE_ELEMENTS]; /** The number of URBs in the pool. */ volatile uint32_t cUrbsInPool; /** Align the size to a 8 byte boundary. */ uint32_t Alignment0; } VUSBURBPOOL; /** Pointer to a VUSB URB pool. */ typedef VUSBURBPOOL *PVUSBURBPOOL; AssertCompileSizeAlignment(VUSBURBPOOL, 8); /** * A Virtual USB device (core). * * @implements VUSBIDEVICE */ typedef struct VUSBDEV { /** The device interface exposed to the HCI. */ VUSBIDEVICE IDevice; /** Pointer to the PDM USB device instance. */ PPDMUSBINS pUsbIns; /** Next device in the chain maintained by the roothub. */ PVUSBDEV pNext; /** Pointer to the next device with the same address hash. */ PVUSBDEV pNextHash; /** Pointer to the hub this device is attached to. */ PVUSBHUB pHub; /** The device state. */ VUSBDEVICESTATE volatile enmState; /** Reference counter to protect the device structure from going away. */ uint32_t volatile cRefs; /** The device address. */ uint8_t u8Address; /** The new device address. */ uint8_t u8NewAddress; /** The port. */ int16_t i16Port; /** Device status. (VUSB_DEV_SELF_POWERED or not.) */ uint16_t u16Status; /** Pointer to the descriptor cache. * (Provided by the device thru the pfnGetDescriptorCache method.) */ PCPDMUSBDESCCACHE pDescCache; /** Current configuration. */ PCVUSBDESCCONFIGEX pCurCfgDesc; /** Current interface state (including alternate interface setting) - maximum * valid index is config->bNumInterfaces */ PVUSBINTERFACESTATE paIfStates; /** Pipe/direction -> endpoint descriptor mapping */ VUSBPIPE aPipes[VUSB_PIPE_MAX]; /** Critical section protecting the active URB list. */ RTCRITSECT CritSectAsyncUrbs; /** List of active async URBs. */ RTLISTANCHOR LstAsyncUrbs; /** Dumper state. */ union VUSBDEVURBDUMPERSTATE { /** The current scsi command. */ uint8_t u8ScsiCmd; } Urb; /** The reset timer handle. */ PTMTIMER pResetTimer; /** Reset handler arguments. */ void *pvArgs; /** URB submit and reap thread. */ RTTHREAD hUrbIoThread; /** Request queue for executing tasks on the I/O thread which should be done * synchronous and without any other thread accessing the USB device. */ RTREQQUEUE hReqQueueSync; /** Sniffer instance for this device if configured. */ VUSBSNIFFER hSniffer; /** Flag whether the URB I/O thread should terminate. */ bool volatile fTerminate; /** Flag whether the I/O thread was woken up. */ bool volatile fWokenUp; #if HC_ARCH_BITS == 32 /** Align the size to a 8 byte boundary. */ bool afAlignment0[2]; #endif /** The pool of free URBs for faster allocation. */ VUSBURBPOOL UrbPool; } VUSBDEV; AssertCompileSizeAlignment(VUSBDEV, 8); int vusbDevInit(PVUSBDEV pDev, PPDMUSBINS pUsbIns, const char *pszCaptureFilename); void vusbDevDestroy(PVUSBDEV pDev); DECLINLINE(bool) vusbDevIsRh(PVUSBDEV pDev) { return (pDev->pHub == (PVUSBHUB)pDev); } bool vusbDevDoSelectConfig(PVUSBDEV dev, PCVUSBDESCCONFIGEX pCfg); void vusbDevMapEndpoint(PVUSBDEV dev, PCVUSBDESCENDPOINTEX ep); int vusbDevDetach(PVUSBDEV pDev); DECLINLINE(PVUSBROOTHUB) vusbDevGetRh(PVUSBDEV pDev); size_t vusbDevMaxInterfaces(PVUSBDEV dev); void vusbDevSetAddress(PVUSBDEV pDev, uint8_t u8Address); bool vusbDevStandardRequest(PVUSBDEV pDev, int EndPt, PVUSBSETUP pSetup, void *pvBuf, uint32_t *pcbBuf); /** @} */ /** @name Internal Hub Operations, Structures and Constants. * @{ */ /** Virtual method table for USB hub devices. * Hub and roothub drivers need to implement these functions in addition to the * vusb_dev_ops. */ typedef struct VUSBHUBOPS { int (*pfnAttach)(PVUSBHUB pHub, PVUSBDEV pDev); void (*pfnDetach)(PVUSBHUB pHub, PVUSBDEV pDev); } VUSBHUBOPS; /** Pointer to a const HUB method table. */ typedef const VUSBHUBOPS *PCVUSBHUBOPS; /** A VUSB Hub Device - Hub and roothub drivers need to use this struct * @todo eliminate this (PDM / roothubs only). */ typedef struct VUSBHUB { VUSBDEV Dev; PCVUSBHUBOPS pOps; PVUSBROOTHUB pRootHub; uint16_t cPorts; uint16_t cDevices; /** Name of the hub. Used for logging. */ char *pszName; } VUSBHUB; AssertCompileMemberAlignment(VUSBHUB, pOps, 8); AssertCompileSizeAlignment(VUSBHUB, 8); /** @} */ /** @name Internal Root Hub Operations, Structures and Constants. * @{ */ /** * Per transfer type statistics. */ typedef struct VUSBROOTHUBTYPESTATS { STAMCOUNTER StatUrbsSubmitted; STAMCOUNTER StatUrbsFailed; STAMCOUNTER StatUrbsCancelled; STAMCOUNTER StatReqBytes; STAMCOUNTER StatReqReadBytes; STAMCOUNTER StatReqWriteBytes; STAMCOUNTER StatActBytes; STAMCOUNTER StatActReadBytes; STAMCOUNTER StatActWriteBytes; } VUSBROOTHUBTYPESTATS, *PVUSBROOTHUBTYPESTATS; /** The address hash table size. */ #define VUSB_ADDR_HASHSZ 5 /** * The instance data of a root hub driver. * * This extends the generic VUSB hub. * * @implements VUSBIROOTHUBCONNECTOR */ typedef struct VUSBROOTHUB { /** The HUB. * @todo remove this? */ VUSBHUB Hub; /** Address hash table. */ PVUSBDEV apAddrHash[VUSB_ADDR_HASHSZ]; /** The default address. */ PVUSBDEV pDefaultAddress; /** Pointer to the driver instance. */ PPDMDRVINS pDrvIns; /** Pointer to the root hub port interface we're attached to. */ PVUSBIROOTHUBPORT pIRhPort; /** Connector interface exposed upwards. */ VUSBIROOTHUBCONNECTOR IRhConnector; /** Critical section protecting the device list. */ RTCRITSECT CritSectDevices; /** Chain of devices attached to this hub. */ PVUSBDEV pDevices; #if HC_ARCH_BITS == 32 uint32_t Alignment0; #endif /** Availability Bitmap. */ VUSBPORTBITMAP Bitmap; /** Sniffer instance for the root hub. */ VUSBSNIFFER hSniffer; /** Version of the attached Host Controller. */ uint32_t fHcVersions; /** Size of the HCI specific data for each URB. */ size_t cbHci; /** Size of the HCI specific TD. */ size_t cbHciTd; /** The periodic frame processing thread. */ R3PTRTYPE(PPDMTHREAD) hThreadPeriodFrame; /** Event semaphore to interact with the periodic frame processing thread. */ R3PTRTYPE(RTSEMEVENTMULTI) hSemEventPeriodFrame; /** Event semaphore to release the thread waiting for the periodic frame processing thread to stop. */ R3PTRTYPE(RTSEMEVENTMULTI) hSemEventPeriodFrameStopped; /** Current default frame rate for periodic frame processing thread. */ volatile uint32_t uFrameRateDefault; /** Current frame rate (can be lower than the default frame rate if there is no activity). */ uint32_t uFrameRate; /** How long to wait until the next frame. */ uint64_t nsWait; /** Timestamp when the last frame was processed. */ uint64_t tsFrameProcessed; /** Number of USB work cycles with no transfers. */ uint32_t cIdleCycles; /** Flag whether a frame is currently being processed. */ volatile bool fFrameProcessing; #if HC_ARCH_BITS == 32 uint32_t Alignment1; #endif #ifdef LOG_ENABLED /** A serial number for URBs submitted on the roothub instance. * Only logging builds. */ uint32_t iSerial; /** Alignment */ uint32_t Alignment2; #endif #ifdef VBOX_WITH_STATISTICS VUSBROOTHUBTYPESTATS Total; VUSBROOTHUBTYPESTATS aTypes[VUSBXFERTYPE_MSG]; STAMCOUNTER StatIsocReqPkts; STAMCOUNTER StatIsocReqReadPkts; STAMCOUNTER StatIsocReqWritePkts; STAMCOUNTER StatIsocActPkts; STAMCOUNTER StatIsocActReadPkts; STAMCOUNTER StatIsocActWritePkts; struct { STAMCOUNTER Pkts; STAMCOUNTER Ok; STAMCOUNTER Ok0; STAMCOUNTER DataUnderrun; STAMCOUNTER DataUnderrun0; STAMCOUNTER DataOverrun; STAMCOUNTER NotAccessed; STAMCOUNTER Misc; STAMCOUNTER Bytes; } aStatIsocDetails[8]; STAMPROFILE StatReapAsyncUrbs; STAMPROFILE StatSubmitUrb; STAMCOUNTER StatFramesProcessedClbk; STAMCOUNTER StatFramesProcessedThread; #endif } VUSBROOTHUB; AssertCompileMemberAlignment(VUSBROOTHUB, IRhConnector, 8); AssertCompileMemberAlignment(VUSBROOTHUB, Bitmap, 8); AssertCompileMemberAlignment(VUSBROOTHUB, CritSectDevices, 8); #ifdef VBOX_WITH_STATISTICS AssertCompileMemberAlignment(VUSBROOTHUB, Total, 8); #endif /** Converts a pointer to VUSBROOTHUB::IRhConnector to a PVUSBROOTHUB. */ #define VUSBIROOTHUBCONNECTOR_2_VUSBROOTHUB(pInterface) (PVUSBROOTHUB)( (uintptr_t)(pInterface) - RT_OFFSETOF(VUSBROOTHUB, IRhConnector) ) /** * URB cancellation modes */ typedef enum CANCELMODE { /** complete the URB with an error (CRC). */ CANCELMODE_FAIL = 0, /** do not change the URB contents. */ CANCELMODE_UNDO } CANCELMODE; /* @} */ /** @name Internal URB Operations, Structures and Constants. * @{ */ int vusbUrbSubmit(PVUSBURB pUrb); void vusbUrbDoReapAsync(PRTLISTANCHOR pUrbLst, RTMSINTERVAL cMillies); void vusbUrbDoReapAsyncDev(PVUSBDEV pDev, RTMSINTERVAL cMillies); void vusbUrbCancel(PVUSBURB pUrb, CANCELMODE mode); void vusbUrbCancelAsync(PVUSBURB pUrb, CANCELMODE mode); void vusbUrbRipe(PVUSBURB pUrb); void vusbUrbCompletionRh(PVUSBURB pUrb); int vusbUrbSubmitHardError(PVUSBURB pUrb); int vusbUrbErrorRh(PVUSBURB pUrb); int vusbDevUrbIoThreadWakeup(PVUSBDEV pDev); int vusbDevUrbIoThreadCreate(PVUSBDEV pDev); int vusbDevUrbIoThreadDestroy(PVUSBDEV pDev); DECLHIDDEN(void) vusbDevCancelAllUrbs(PVUSBDEV pDev, bool fDetaching); DECLHIDDEN(int) vusbDevIoThreadExecV(PVUSBDEV pDev, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, va_list Args); DECLHIDDEN(int) vusbDevIoThreadExec(PVUSBDEV pDev, uint32_t fFlags, PFNRT pfnFunction, unsigned cArgs, ...); DECLHIDDEN(int) vusbDevIoThreadExecSync(PVUSBDEV pDev, PFNRT pfnFunction, unsigned cArgs, ...); DECLHIDDEN(int) vusbUrbCancelWorker(PVUSBURB pUrb, CANCELMODE enmMode); DECLHIDDEN(uint64_t) vusbRhR3ProcessFrame(PVUSBROOTHUB pThis, bool fCallback); int vusbUrbQueueAsyncRh(PVUSBURB pUrb); /** * Completes an URB from a buffered pipe. * * @returns nothing. * @param pUrb The URB to complete. */ DECLHIDDEN(void) vusbBufferedPipeCompleteUrb(PVUSBURB pUrb); /** * Creates a new buffered pipe. * * @returns VBox status code. * @retval VERR_NOT_SUPPORTED if buffering is not supported for the given pipe. * @param pDev The device instance the pipe is associated with. * @param pPipe The pipe to buffer. * @param enmDirection The direction for the buffering. * @param enmSpeed USB device speed. * @param cLatencyMs The maximum latency the buffering should introduce, this influences * the amount of data to buffer. * @param phBuffer Where to store the handle to the buffer on success. */ DECLHIDDEN(int) vusbBufferedPipeCreate(PVUSBDEV pDev, PVUSBPIPE pPipe, VUSBDIRECTION enmDirection, VUSBSPEED enmSpeed, uint32_t cLatencyMs, PVUSBBUFFEREDPIPE phBuffer); /** * Destroys a buffered pipe, freeing all acquired resources. * * @returns nothing. * @param hBuffer The buffered pipe handle. */ DECLHIDDEN(void) vusbBufferedPipeDestroy(VUSBBUFFEREDPIPE hBuffer); /** * Submits a URB from the HCD which is subject to buffering. * * @returns VBox status code. * @param hBuffer The buffered pipe handle. * @param pUrb The URB from the HCD which is subject to buffering. */ DECLHIDDEN(int) vusbBufferedPipeSubmitUrb(VUSBBUFFEREDPIPE hBuffer, PVUSBURB pUrb); /** * Initializes the given URB pool. * * @returns VBox status code. * @param pUrbPool The URB pool to initialize. */ DECLHIDDEN(int) vusbUrbPoolInit(PVUSBURBPOOL pUrbPool); /** * Destroy a given URB pool freeing all ressources. * * @returns nothing. * @param pUrbPool The URB pool to destroy. */ DECLHIDDEN(void) vusbUrbPoolDestroy(PVUSBURBPOOL pUrbPool); /** * Allocate a new URB from the given URB pool. * * @returns Pointer to the new URB or NULL if out of memory. * @param pUrbPool The URB pool to allocate from. * @param enmType Type of the URB. * @param enmDir The direction of the URB. * @param cbData The number of bytes to allocate for the data buffer. * @param cbHci Size of the data private to the HCI for each URB when allocated. * @param cbHciTd Size of one transfer descriptor. * @param cTds Number of transfer descriptors. */ DECLHIDDEN(PVUSBURB) vusbUrbPoolAlloc(PVUSBURBPOOL pUrbPool, VUSBXFERTYPE enmType, VUSBDIRECTION enmDir, size_t cbData, size_t cbHci, size_t cbHciTd, unsigned cTds); /** * Frees a given URB. * * @returns nothing. * @param pUrbPool The URB pool the URB was allocated from. * @param pUrb The URB to free. */ DECLHIDDEN(void) vusbUrbPoolFree(PVUSBURBPOOL pUrbPool, PVUSBURB pUrb); #ifdef LOG_ENABLED /** * Logs an URB in the debug log. * * @returns nothing. * @param pUrb The URB to log. * @param pszMsg Additional message to log. * @param fComplete Flag whther the URB is completing. */ DECLHIDDEN(void) vusbUrbTrace(PVUSBURB pUrb, const char *pszMsg, bool fComplete); /** * Return the USB direction as a string from the given enum. */ DECLHIDDEN(const char *) vusbUrbDirName(VUSBDIRECTION enmDir); /** * Return the URB type as string from the given enum. */ DECLHIDDEN(const char *) vusbUrbTypeName(VUSBXFERTYPE enmType); /** * Return the URB status as string from the given enum. */ DECLHIDDEN(const char *) vusbUrbStatusName(VUSBSTATUS enmStatus); #endif DECLINLINE(void) vusbUrbUnlink(PVUSBURB pUrb) { PVUSBDEV pDev = pUrb->pVUsb->pDev; RTCritSectEnter(&pDev->CritSectAsyncUrbs); RTListNodeRemove(&pUrb->pVUsb->NdLst); RTCritSectLeave(&pDev->CritSectAsyncUrbs); } /** @def vusbUrbAssert * Asserts that a URB is valid. */ #ifdef VBOX_STRICT # define vusbUrbAssert(pUrb) do { \ AssertMsg(VALID_PTR((pUrb)), ("%p\n", (pUrb))); \ AssertMsg((pUrb)->u32Magic == VUSBURB_MAGIC, ("%#x", (pUrb)->u32Magic)); \ AssertMsg((pUrb)->enmState > VUSBURBSTATE_INVALID && (pUrb)->enmState < VUSBURBSTATE_END, \ ("%d\n", (pUrb)->enmState)); \ } while (0) #else # define vusbUrbAssert(pUrb) do {} while (0) #endif /** * @def VUSBDEV_ASSERT_VALID_STATE * Asserts that the give device state is valid. */ #define VUSBDEV_ASSERT_VALID_STATE(enmState) \ AssertMsg((enmState) > VUSB_DEVICE_STATE_INVALID && (enmState) < VUSB_DEVICE_STATE_DESTROYED, ("enmState=%#x\n", enmState)); /** Executes a function synchronously. */ #define VUSB_DEV_IO_THREAD_EXEC_FLAGS_SYNC RT_BIT_32(0) /** @} */ /** * Addresses are between 0 and 127 inclusive */ DECLINLINE(uint8_t) vusbHashAddress(uint8_t Address) { uint8_t u8Hash = Address; u8Hash ^= (Address >> 2); u8Hash ^= (Address >> 3); u8Hash %= VUSB_ADDR_HASHSZ; return u8Hash; } /** * Gets the roothub of a device. * * @returns Pointer to the roothub instance the device is attached to. * @returns NULL if not attached to any hub. * @param pDev Pointer to the device in question. */ DECLINLINE(PVUSBROOTHUB) vusbDevGetRh(PVUSBDEV pDev) { if (!pDev->pHub) return NULL; return pDev->pHub->pRootHub; } /** * Returns the state of the USB device. * * @returns State of the USB device. * @param pDev Pointer to the device. */ DECLINLINE(VUSBDEVICESTATE) vusbDevGetState(PVUSBDEV pDev) { VUSBDEVICESTATE enmState = (VUSBDEVICESTATE)ASMAtomicReadU32((volatile uint32_t *)&pDev->enmState); VUSBDEV_ASSERT_VALID_STATE(enmState); return enmState; } /** * Sets the given state for the USB device. * * @returns The old state of the device. * @param pDev Pointer to the device. * @param enmState The new state to set. */ DECLINLINE(VUSBDEVICESTATE) vusbDevSetState(PVUSBDEV pDev, VUSBDEVICESTATE enmState) { VUSBDEV_ASSERT_VALID_STATE(enmState); VUSBDEVICESTATE enmStateOld = (VUSBDEVICESTATE)ASMAtomicXchgU32((volatile uint32_t *)&pDev->enmState, enmState); VUSBDEV_ASSERT_VALID_STATE(enmStateOld); return enmStateOld; } /** * Compare and exchange the states for the given USB device. * * @returns true if the state was changed. * @returns false if the state wasn't changed. * @param pDev Pointer to the device. * @param enmStateNew The new state to set. * @param enmStateOld The old state to compare with. */ DECLINLINE(bool) vusbDevSetStateCmp(PVUSBDEV pDev, VUSBDEVICESTATE enmStateNew, VUSBDEVICESTATE enmStateOld) { VUSBDEV_ASSERT_VALID_STATE(enmStateNew); VUSBDEV_ASSERT_VALID_STATE(enmStateOld); return ASMAtomicCmpXchgU32((volatile uint32_t *)&pDev->enmState, enmStateNew, enmStateOld); } /** * Retains the given VUSB device pointer. * * @returns New reference count. * @param pThis The VUSB device pointer. */ DECLINLINE(uint32_t) vusbDevRetain(PVUSBDEV pThis) { AssertPtrReturn(pThis, UINT32_MAX); uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs); AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis)); return cRefs; } /** * Releases the given VUSB device pointer. * * @returns New reference count. * @retval 0 if no onw is holding a reference anymore causing the device to be destroyed. */ DECLINLINE(uint32_t) vusbDevRelease(PVUSBDEV pThis) { AssertPtrReturn(pThis, UINT32_MAX); uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs); AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis)); if (cRefs == 0) vusbDevDestroy(pThis); return cRefs; } /** Strings for the CTLSTAGE enum values. */ extern const char * const g_apszCtlStates[4]; /** Default message pipe. */ extern const VUSBDESCENDPOINTEX g_Endpoint0; /** Default configuration. */ extern const VUSBDESCCONFIGEX g_Config0; RT_C_DECLS_END #endif