EmulatedUSBImpl.cpp

Last change on this file was 106061, checked in by vboxsync, 2 months ago
Copyright year updates by scm.
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1	/* $Id: EmulatedUSBImpl.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* Emulated USB manager implementation.
4	*/
5
6	/*
7	* Copyright (C) 2013-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	#define LOG_GROUP LOG_GROUP_MAIN_EMULATEDUSB
29	#include "LoggingNew.h"
30
31	#include "EmulatedUSBImpl.h"
32	#include "ConsoleImpl.h"
33
34	#include <VBox/vmm/pdmusb.h>
35	#include <VBox/vmm/vmmr3vtable.h>
36
37
38	/*
39	* Emulated USB webcam device instance.
40	*/
41	typedef std::map <Utf8Str, Utf8Str> EUSBSettingsMap;
42
43	typedef enum EUSBDEVICESTATUS
44	{
45	EUSBDEVICE_CREATED,
46	EUSBDEVICE_ATTACHING,
47	EUSBDEVICE_ATTACHED
48	} EUSBDEVICESTATUS;
49
50	class EUSBWEBCAM /* : public EUSBDEVICE */
51	{
52	private:
53	int32_t volatile mcRefs;
54
55	EmulatedUSB *mpEmulatedUSB;
56
57	RTUUID mUuid;
58	char mszUuid[RTUUID_STR_LENGTH];
59
60	Utf8Str mPath;
61	Utf8Str mSettings;
62
63	EUSBSettingsMap mDevSettings;
64	EUSBSettingsMap mDrvSettings;
65
66	void *mpvObject;
67
68	static DECLCALLBACK(int) emulatedWebcamAttach(PUVM pUVM, PCVMMR3VTABLE pVMM, EUSBWEBCAM pThis, const char pszDriver);
69	static DECLCALLBACK(int) emulatedWebcamDetach(PUVM pUVM, PCVMMR3VTABLE pVMM, EUSBWEBCAM *pThis);
70
71	HRESULT settingsParse(void);
72
73	~EUSBWEBCAM()
74	{
75	}
76
77	public:
78	EUSBWEBCAM()
79	:
80	mcRefs(1),
81	mpEmulatedUSB(NULL),
82	mpvObject(NULL),
83	enmStatus(EUSBDEVICE_CREATED)
84	{
85	RT_ZERO(mUuid);
86	RT_ZERO(mszUuid);
87	}
88
89	int32_t AddRef(void)
90	{
91	return ASMAtomicIncS32(&mcRefs);
92	}
93
94	void Release(void)
95	{
96	int32_t c = ASMAtomicDecS32(&mcRefs);
97	if (c == 0)
98	{
99	delete this;
100	}
101	}
102
103	HRESULT Initialize(Console *pConsole,
104	EmulatedUSB *pEmulatedUSB,
105	const com::Utf8Str *aPath,
106	const com::Utf8Str *aSettings,
107	void *pvObject);
108	HRESULT Attach(Console pConsole, PUVM pUVM, PCVMMR3VTABLE pVMM, const char pszDriver);
109	HRESULT Detach(Console *pConsole, PUVM pUVM, PCVMMR3VTABLE pVMM);
110
111	bool HasId(const char *pszId) { return RTStrCmp(pszId, mszUuid) == 0;}
112
113	void *getObjectPtr() { return mpvObject; }
114
115	EUSBDEVICESTATUS enmStatus;
116	};
117
118
119	static int emulatedWebcamInsertSettings(PCFGMNODE pConfig, PCVMMR3VTABLE pVMM, EUSBSettingsMap *pSettings)
120	{
121	for (EUSBSettingsMap::const_iterator it = pSettings->begin(); it != pSettings->end(); ++it)
122	{
123	/* Convert some well known settings for backward compatibility. */
124	int vrc;
125	if ( RTStrCmp(it->first.c_str(), "MaxPayloadTransferSize") == 0
126	\|\| RTStrCmp(it->first.c_str(), "MaxFramerate") == 0)
127	{
128	uint32_t u32 = 0;
129	vrc = RTStrToUInt32Full(it->second.c_str(), 10, &u32);
130	if (vrc == VINF_SUCCESS)
131	vrc = pVMM->pfnCFGMR3InsertInteger(pConfig, it->first.c_str(), u32);
132	else if (RT_SUCCESS(vrc)) /* VWRN_* */
133	vrc = VERR_INVALID_PARAMETER;
134	}
135	else
136	vrc = pVMM->pfnCFGMR3InsertString(pConfig, it->first.c_str(), it->second.c_str());
137	if (RT_FAILURE(vrc))
138	return vrc;
139	}
140
141	return VINF_SUCCESS;
142	}
143
144	/static/ DECLCALLBACK(int)
145	EUSBWEBCAM::emulatedWebcamAttach(PUVM pUVM, PCVMMR3VTABLE pVMM, EUSBWEBCAM pThis, const char pszDriver)
146	{
147	PCFGMNODE pInstance = pVMM->pfnCFGMR3CreateTree(pUVM);
148	PCFGMNODE pConfig;
149	int vrc = pVMM->pfnCFGMR3InsertNode(pInstance, "Config", &pConfig);
150	AssertRCReturn(vrc, vrc);
151	vrc = emulatedWebcamInsertSettings(pConfig, pVMM, &pThis->mDevSettings);
152	AssertRCReturn(vrc, vrc);
153
154	PCFGMNODE pEUSB;
155	vrc = pVMM->pfnCFGMR3InsertNode(pConfig, "EmulatedUSB", &pEUSB);
156	AssertRCReturn(vrc, vrc);
157	vrc = pVMM->pfnCFGMR3InsertString(pEUSB, "Id", pThis->mszUuid);
158	AssertRCReturn(vrc, vrc);
159
160	PCFGMNODE pLunL0;
161	vrc = pVMM->pfnCFGMR3InsertNode(pInstance, "LUN#0", &pLunL0);
162	AssertRCReturn(vrc, vrc);
163	vrc = pVMM->pfnCFGMR3InsertString(pLunL0, "Driver", pszDriver);
164	AssertRCReturn(vrc, vrc);
165	vrc = pVMM->pfnCFGMR3InsertNode(pLunL0, "Config", &pConfig);
166	AssertRCReturn(vrc, vrc);
167	vrc = pVMM->pfnCFGMR3InsertString(pConfig, "DevicePath", pThis->mPath.c_str());
168	AssertRCReturn(vrc, vrc);
169	vrc = pVMM->pfnCFGMR3InsertString(pConfig, "Id", pThis->mszUuid);
170	AssertRCReturn(vrc, vrc);
171	vrc = emulatedWebcamInsertSettings(pConfig, pVMM, &pThis->mDrvSettings);
172	AssertRCReturn(vrc, vrc);
173
174	/* pInstance will be used by PDM and deallocated on error. */
175	vrc = pVMM->pfnPDMR3UsbCreateEmulatedDevice(pUVM, "Webcam", pInstance, &pThis->mUuid, NULL);
176	LogRelFlowFunc(("PDMR3UsbCreateEmulatedDevice %Rrc\n", vrc));
177	return vrc;
178	}
179
180	/static/ DECLCALLBACK(int)
181	EUSBWEBCAM::emulatedWebcamDetach(PUVM pUVM, PCVMMR3VTABLE pVMM, EUSBWEBCAM *pThis)
182	{
183	return pVMM->pfnPDMR3UsbDetachDevice(pUVM, &pThis->mUuid);
184	}
185
186	HRESULT EUSBWEBCAM::Initialize(Console *pConsole,
187	EmulatedUSB *pEmulatedUSB,
188	const com::Utf8Str *aPath,
189	const com::Utf8Str *aSettings,
190	void *pvObject)
191	{
192	HRESULT hrc = S_OK;
193
194	int vrc = RTUuidCreate(&mUuid);
195	AssertRCReturn(vrc, pConsole->setError(vrc, EmulatedUSB::tr("Init emulated USB webcam (RTUuidCreate -> %Rrc)"), vrc));
196
197	RTStrPrintf(mszUuid, sizeof(mszUuid), "%RTuuid", &mUuid);
198	hrc = mPath.assignEx(*aPath);
199	if (SUCCEEDED(hrc))
200	{
201	hrc = mSettings.assignEx(*aSettings);
202	if (SUCCEEDED(hrc))
203	{
204	hrc = settingsParse();
205	if (SUCCEEDED(hrc))
206	{
207	mpEmulatedUSB = pEmulatedUSB;
208	mpvObject = pvObject;
209	}
210	}
211	}
212
213	return hrc;
214	}
215
216	HRESULT EUSBWEBCAM::settingsParse(void)
217	{
218	HRESULT hr = S_OK;
219
220	/* Parse mSettings string:
221	* "[dev:\|drv:]Name1=Value1;[dev:\|drv:]Name2=Value2"
222	*/
223	char *pszSrc = mSettings.mutableRaw();
224
225	if (pszSrc)
226	{
227	while (*pszSrc)
228	{
229	/* Does the setting belong to device of driver. Default is both. */
230	bool fDev = true;
231	bool fDrv = true;
232	if (RTStrNICmp(pszSrc, RT_STR_TUPLE("drv:")) == 0)
233	{
234	pszSrc += sizeof("drv:")-1;
235	fDev = false;
236	}
237	else if (RTStrNICmp(pszSrc, RT_STR_TUPLE("dev:")) == 0)
238	{
239	pszSrc += sizeof("dev:")-1;
240	fDrv = false;
241	}
242
243	char *pszEq = strchr(pszSrc, '=');
244	if (!pszEq)
245	{
246	hr = E_INVALIDARG;
247	break;
248	}
249
250	char *pszEnd = strchr(pszEq, ';');
251	if (!pszEnd)
252	pszEnd = pszEq + strlen(pszEq);
253
254	*pszEq = 0;
255	char chEnd = *pszEnd;
256	*pszEnd = 0;
257
258	/* Empty strings not allowed. */
259	if (*pszSrc != 0 && pszEq[1] != 0)
260	{
261	if (fDev)
262	mDevSettings[pszSrc] = &pszEq[1];
263	if (fDrv)
264	mDrvSettings[pszSrc] = &pszEq[1];
265	}
266
267	*pszEq = '=';
268	*pszEnd = chEnd;
269
270	pszSrc = pszEnd;
271	if (*pszSrc == ';')
272	pszSrc++;
273	}
274
275	if (SUCCEEDED(hr))
276	{
277	EUSBSettingsMap::const_iterator it;
278	for (it = mDevSettings.begin(); it != mDevSettings.end(); ++it)
279	LogRelFlowFunc(("[dev:%s] = [%s]\n", it->first.c_str(), it->second.c_str()));
280	for (it = mDrvSettings.begin(); it != mDrvSettings.end(); ++it)
281	LogRelFlowFunc(("[drv:%s] = [%s]\n", it->first.c_str(), it->second.c_str()));
282	}
283	}
284
285	return hr;
286	}
287
288	HRESULT EUSBWEBCAM::Attach(Console pConsole, PUVM pUVM, PCVMMR3VTABLE pVMM, const char pszDriver)
289	{
290	int vrc = pVMM->pfnVMR3ReqCallWaitU(pUVM, 0 /* idDstCpu (saved state, see #6232) */, (PFNRT)emulatedWebcamAttach, 4,
291	pUVM, pVMM, this, pszDriver);
292	if (RT_SUCCESS(vrc))
293	return S_OK;
294	LogFlowThisFunc(("%Rrc\n", vrc));
295	return pConsole->setErrorBoth(VBOX_E_VM_ERROR, vrc, EmulatedUSB::tr("Attach emulated USB webcam (%Rrc)"), vrc);
296	}
297
298	HRESULT EUSBWEBCAM::Detach(Console *pConsole, PUVM pUVM, PCVMMR3VTABLE pVMM)
299	{
300	int vrc = pVMM->pfnVMR3ReqCallWaitU(pUVM, 0 /* idDstCpu (saved state, see #6232) */, (PFNRT)emulatedWebcamDetach, 3,
301	pUVM, pVMM, this);
302	if (RT_SUCCESS(vrc))
303	return S_OK;
304	LogFlowThisFunc(("%Rrc\n", vrc));
305	return pConsole->setErrorBoth(VBOX_E_VM_ERROR, vrc, EmulatedUSB::tr("Detach emulated USB webcam (%Rrc)"), vrc);
306	}
307
308
309	/*
310	* EmulatedUSB implementation.
311	*/
312	DEFINE_EMPTY_CTOR_DTOR(EmulatedUSB)
313
314	HRESULT EmulatedUSB::FinalConstruct()
315	{
316	return BaseFinalConstruct();
317	}
318
319	void EmulatedUSB::FinalRelease()
320	{
321	uninit();
322
323	BaseFinalRelease();
324	}
325
326	/*
327	* Initializes the instance.
328	*
329	* @param pConsole The owner.
330	*/
331	HRESULT EmulatedUSB::init(ComObjPtr<Console> pConsole)
332	{
333	LogFlowThisFunc(("\n"));
334
335	ComAssertRet(!pConsole.isNull(), E_INVALIDARG);
336
337	/* Enclose the state transition NotReady->InInit->Ready */
338	AutoInitSpan autoInitSpan(this);
339	AssertReturn(autoInitSpan.isOk(), E_FAIL);
340
341	m.pConsole = pConsole;
342
343	mEmUsbIf.pvUser = this;
344	mEmUsbIf.pfnQueryEmulatedUsbDataById = EmulatedUSB::i_QueryEmulatedUsbDataById;
345
346	/* Confirm a successful initialization */
347	autoInitSpan.setSucceeded();
348
349	return S_OK;
350	}
351
352	/*
353	* Uninitializes the instance.
354	* Called either from FinalRelease() or by the parent when it gets destroyed.
355	*/
356	void EmulatedUSB::uninit()
357	{
358	LogFlowThisFunc(("\n"));
359
360	m.pConsole.setNull();
361
362	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
363	for (WebcamsMap::iterator it = m.webcams.begin(); it != m.webcams.end(); ++it)
364	{
365	EUSBWEBCAM *p = it->second;
366	if (p)
367	{
368	it->second = NULL;
369	p->Release();
370	}
371	}
372	m.webcams.clear();
373	alock.release();
374
375	/* Enclose the state transition Ready->InUninit->NotReady */
376	AutoUninitSpan autoUninitSpan(this);
377	if (autoUninitSpan.uninitDone())
378	return;
379	}
380
381	HRESULT EmulatedUSB::getWebcams(std::vector<com::Utf8Str> &aWebcams)
382	{
383	HRESULT hrc = S_OK;
384
385	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
386
387	try
388	{
389	aWebcams.resize(m.webcams.size());
390	}
391	catch (std::bad_alloc &)
392	{
393	hrc = E_OUTOFMEMORY;
394	}
395	catch (...)
396	{
397	hrc = E_FAIL;
398	}
399
400	if (SUCCEEDED(hrc))
401	{
402	size_t i;
403	WebcamsMap::const_iterator it;
404	for (i = 0, it = m.webcams.begin(); it != m.webcams.end(); ++it)
405	aWebcams[i++] = it->first;
406	}
407
408	return hrc;
409	}
410
411	PEMULATEDUSBIF EmulatedUSB::i_getEmulatedUsbIf()
412	{
413	return &mEmUsbIf;
414	}
415
416	static const Utf8Str s_pathDefault(".0");
417
418	HRESULT EmulatedUSB::webcamAttach(const com::Utf8Str &aPath,
419	const com::Utf8Str &aSettings)
420	{
421	return i_webcamAttachInternal(aPath, aSettings, "HostWebcam", NULL);
422	}
423
424	HRESULT EmulatedUSB::i_webcamAttachInternal(const com::Utf8Str &aPath,
425	const com::Utf8Str &aSettings,
426	const char *pszDriver,
427	void *pvObject)
428	{
429	HRESULT hrc = S_OK;
430
431	const Utf8Str &path = aPath.isEmpty() \|\| aPath == "."? s_pathDefault: aPath;
432
433	Console::SafeVMPtr ptrVM(m.pConsole);
434	if (ptrVM.isOk())
435	{
436	EUSBWEBCAM *p = new EUSBWEBCAM();
437	if (p)
438	{
439	hrc = p->Initialize(m.pConsole, this, &path, &aSettings, pvObject);
440	if (SUCCEEDED(hrc))
441	{
442	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
443	WebcamsMap::const_iterator it = m.webcams.find(path);
444	if (it == m.webcams.end())
445	{
446	p->AddRef();
447	try
448	{
449	m.webcams[path] = p;
450	}
451	catch (std::bad_alloc &)
452	{
453	hrc = E_OUTOFMEMORY;
454	}
455	catch (...)
456	{
457	hrc = E_FAIL;
458	}
459	p->enmStatus = EUSBDEVICE_ATTACHING;
460	}
461	else
462	{
463	hrc = E_FAIL;
464	}
465	}
466
467	if (SUCCEEDED(hrc))
468	hrc = p->Attach(m.pConsole, ptrVM.rawUVM(), ptrVM.vtable(), pszDriver);
469
470	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
471	if (SUCCEEDED(hrc))
472	p->enmStatus = EUSBDEVICE_ATTACHED;
473	else if (p->enmStatus != EUSBDEVICE_CREATED)
474	m.webcams.erase(path);
475	alock.release();
476
477	p->Release();
478	}
479	else
480	{
481	hrc = E_OUTOFMEMORY;
482	}
483	}
484	else
485	{
486	hrc = VBOX_E_INVALID_VM_STATE;
487	}
488
489	return hrc;
490	}
491
492	HRESULT EmulatedUSB::webcamDetach(const com::Utf8Str &aPath)
493	{
494	return i_webcamDetachInternal(aPath);
495	}
496
497	HRESULT EmulatedUSB::i_webcamDetachInternal(const com::Utf8Str &aPath)
498	{
499	HRESULT hrc = S_OK;
500
501	const Utf8Str &path = aPath.isEmpty() \|\| aPath == "."? s_pathDefault: aPath;
502
503	Console::SafeVMPtr ptrVM(m.pConsole);
504	if (ptrVM.isOk())
505	{
506	EUSBWEBCAM *p = NULL;
507
508	AutoWriteLock alock(this COMMA_LOCKVAL_SRC_POS);
509	WebcamsMap::iterator it = m.webcams.find(path);
510	if (it != m.webcams.end())
511	{
512	if (it->second->enmStatus == EUSBDEVICE_ATTACHED)
513	{
514	p = it->second;
515	m.webcams.erase(it);
516	}
517	}
518	alock.release();
519
520	if (p)
521	{
522	hrc = p->Detach(m.pConsole, ptrVM.rawUVM(), ptrVM.vtable());
523	p->Release();
524	}
525	else
526	{
527	hrc = E_INVALIDARG;
528	}
529	}
530	else
531	{
532	hrc = VBOX_E_INVALID_VM_STATE;
533	}
534
535	return hrc;
536	}
537
538	/static/ DECLCALLBACK(int)
539	EmulatedUSB::eusbCallbackEMT(EmulatedUSB pThis, char pszId, uint32_t iEvent, void *pvData, uint32_t cbData)
540	{
541	LogRelFlowFunc(("id %s event %d, data %p %d\n", pszId, iEvent, pvData, cbData));
542
543	NOREF(cbData);
544
545	int vrc = VINF_SUCCESS;
546	if (iEvent == 0)
547	{
548	com::Utf8Str path;
549	HRESULT hrc = pThis->webcamPathFromId(&path, pszId);
550	if (SUCCEEDED(hrc))
551	{
552	hrc = pThis->webcamDetach(path);
553	if (FAILED(hrc))
554	{
555	vrc = VERR_INVALID_STATE;
556	}
557	}
558	else
559	{
560	vrc = VERR_NOT_FOUND;
561	}
562	}
563	else
564	{
565	vrc = VERR_INVALID_PARAMETER;
566	}
567
568	RTMemFree(pszId);
569	RTMemFree(pvData);
570
571	LogRelFlowFunc(("vrc %Rrc\n", vrc));
572	return vrc;
573	}
574
575	/* static */ DECLCALLBACK(int)
576	EmulatedUSB::i_eusbCallback(void pv, const char pszId, uint32_t iEvent, const void *pvData, uint32_t cbData)
577	{
578	/* Make a copy of parameters, forward to EMT and leave the callback to not hold any lock in the device. */
579	int vrc = VINF_SUCCESS;
580	void *pvDataCopy = NULL;
581	if (cbData > 0)
582	{
583	pvDataCopy = RTMemDup(pvData, cbData);
584	if (!pvDataCopy)
585	vrc = VERR_NO_MEMORY;
586	}
587	if (RT_SUCCESS(vrc))
588	{
589	void *pvIdCopy = RTMemDup(pszId, strlen(pszId) + 1);
590	if (pvIdCopy)
591	{
592	if (RT_SUCCESS(vrc))
593	{
594	EmulatedUSB pThis = (EmulatedUSB )pv;
595	Console::SafeVMPtr ptrVM(pThis->m.pConsole);
596	if (ptrVM.isOk())
597	{
598	/* No wait. */
599	vrc = ptrVM.vtable()->pfnVMR3ReqCallNoWaitU(ptrVM.rawUVM(), 0 /* idDstCpu */,
600	(PFNRT)EmulatedUSB::eusbCallbackEMT, 5,
601	pThis, pvIdCopy, iEvent, pvDataCopy, cbData);
602	if (RT_SUCCESS(vrc))
603	return vrc;
604	}
605	else
606	vrc = VERR_INVALID_STATE;
607	}
608	RTMemFree(pvIdCopy);
609	}
610	else
611	vrc = VERR_NO_MEMORY;
612	RTMemFree(pvDataCopy);
613	}
614	return vrc;
615	}
616
617	/static/
618	DECLCALLBACK(int) EmulatedUSB::i_QueryEmulatedUsbDataById(void pvUser, const char pszId, void ppvEmUsbCb, void ppvEmUsbCbData, void **ppvObject)
619	{
620	EmulatedUSB pEmUsb = (EmulatedUSB )pvUser;
621
622	AutoReadLock alock(pEmUsb COMMA_LOCKVAL_SRC_POS);
623	WebcamsMap::const_iterator it;
624	for (it = pEmUsb->m.webcams.begin(); it != pEmUsb->m.webcams.end(); ++it)
625	{
626	EUSBWEBCAM *p = it->second;
627	if (p->HasId(pszId))
628	{
629	if (ppvEmUsbCb)
630	ppvEmUsbCb = (void )EmulatedUSB::i_eusbCallback;
631	if (ppvEmUsbCbData)
632	*ppvEmUsbCbData = pEmUsb;
633	if (ppvObject)
634	*ppvObject = p->getObjectPtr();
635
636	return VINF_SUCCESS;
637	}
638	}
639
640	return VERR_NOT_FOUND;
641	}
642
643	HRESULT EmulatedUSB::webcamPathFromId(com::Utf8Str pPath, const char pszId)
644	{
645	HRESULT hrc = S_OK;
646
647	Console::SafeVMPtr ptrVM(m.pConsole);
648	if (ptrVM.isOk())
649	{
650	AutoReadLock alock(this COMMA_LOCKVAL_SRC_POS);
651	WebcamsMap::const_iterator it;
652	for (it = m.webcams.begin(); it != m.webcams.end(); ++it)
653	{
654	EUSBWEBCAM *p = it->second;
655	if (p->HasId(pszId))
656	{
657	*pPath = it->first;
658	break;
659	}
660	}
661
662	if (it == m.webcams.end())
663	{
664	hrc = E_FAIL;
665	}
666	alock.release();
667	}
668	else
669	{
670	hrc = VBOX_E_INVALID_VM_STATE;
671	}
672
673	return hrc;
674	}
675
676	/* vi: set tabstop=4 shiftwidth=4 expandtab: */

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source: vbox/trunk/src/VBox/Main/src-client/EmulatedUSBImpl.cpp

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