author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:35:00 +0100 | |
branch | RCL_3 |
changeset 43 | 012cc2ee6408 |
parent 42 | f92a4f87e424 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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/** |
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@file |
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@internalComponent |
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*/ |
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#ifndef DEVICEPROXY_H |
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#define DEVICEPROXY_H |
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#include <e32base.h> |
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#include "usbhoststack.h" |
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#ifdef __OVER_DUMMYUSBDI__ |
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#include <usbhost/dummyusbdi/d32usbdi_hubdriver.h> |
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#else |
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#include <d32usbdi_hubdriver.h> |
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#endif |
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class TDeviceEvent; |
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class TOtgDescriptor; |
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NONSHARABLE_CLASS(CDeviceProxy) : public CBase |
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{ |
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public: |
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/** Link between elements of this type in a TSglQue. */ |
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TSglQueLink iLink; |
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public: |
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static CDeviceProxy* NewL(RUsbHubDriver& aHubDriver, TUint aDeviceId); |
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~CDeviceProxy(); |
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public: // querying information from the device |
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TInt GetDeviceDescriptor(TUsbDeviceDescriptor& aDescriptor); |
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TInt GetConfigurationDescriptor(TUsbConfigurationDescriptor& aDescriptor) const; |
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const RArray<TUint>& GetSupportedLanguages() const; |
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void GetManufacturerStringDescriptorL(TUint32 aLangId, TName& aString) const; |
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void GetProductStringDescriptorL(TUint32 aLangId, TName& aString) const; |
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void GetSerialNumberStringDescriptorL(TUint32 aLangId, TName& aString) const; |
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void GetOtgDescriptorL(TOtgDescriptor& aDescriptor) const; |
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void SetOtgDescriptorL(const TUsbOTGDescriptor& aDescriptor); |
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public: // management |
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TInt GetTokenForInterface(TUint aIndex, TUint32& aToken) const; |
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TUint DeviceId() const; |
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void SetDriverLoadingEventData(TDriverLoadStatus aStatus, TInt aError = KErrNone); |
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TInt Suspend(); |
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// These methods TAKE OWNERSHIP of the relevant objects. |
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TDeviceEvent* GetAttachmentEventObject(); |
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TDeviceEvent* GetDriverLoadingEventObject(); |
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TDeviceEvent* GetDetachmentEventObject(); |
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inline void SetMultipleDriversFlag() |
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{ |
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iMultipleDriversFound = ETrue; |
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} |
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inline TBool MultipleDriversFlag() |
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{ |
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return iMultipleDriversFound; |
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} |
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inline void SetHasIADFlag() |
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{ |
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iHasIAD = ETrue; |
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} |
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inline TBool HasIADFlag() |
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{ |
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return iHasIAD; |
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} |
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private: |
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CDeviceProxy(TUint aDeviceId); |
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void ConstructL(RUsbHubDriver& aHubDriver); |
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private: // utility |
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void Log(); |
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void ReadStringDescriptorsL(); |
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void PopulateStringDescriptorsL(TUint8 aStringDescriptorIndex, RArray<TName>& aStringArray); |
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void GetStringDescriptorFromUsbdL(TUint32 aLangId, TName& aString, TUint8 aStringDescriptorIndex) const; |
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void GetStringDescriptorFromCacheL(TUint32 aLangId, TName& aString, const RArray<TName>& aStringArray) const; |
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private: // owned |
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RUsbDevice iHandle; |
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const TUint iId; |
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TDeviceEvent* iAttachmentEvent; |
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TDeviceEvent* iDriverLoadingEvent; |
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TDeviceEvent* iDetachmentEvent; |
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105 |
|
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// The design of string descriptor access in this class deserves some |
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// explanation. |
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// In the simplest implementation of the FDF, we handle a device |
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// attachment without getting or storing any string descriptors from the |
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// device. If the FDF doesn't load any drivers for the device, it must |
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// suspend the device to save power. If USBMAN, subsequent to this, |
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// queries any string descriptors, the FDF will have to resume the device |
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// first (string descriptors are not requested or cached by USBD). |
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// Resuming a device is an asynchronous operation. We must therefore |
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// either make querying a string descriptor asynchronous as far as USBMAN |
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// is concerned (which would clearly make the relevant APIs much less |
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// friendly) or find another way round. [For completeness: this |
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// asynchronicity would rely on |
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// RHubDriver::QueueDeviceStateChangeNotification.] |
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// Solution 1: if the FDF doesn't load drivers for the device, wait until |
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// USBSVR has queried string descriptors from us before suspending the |
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// device. Con: USBMAN only queries string descriptors when its client (in |
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// licensee-land) does so. We can't make any assumptions about their doing |
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// it in a timely manner or indeed at all. |
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// Solution 2: use User::After to give the device time to resume |
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// synchronously. Con: this is a major no-no in a production thread which |
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// must remain responsive to user requests and lower-level events. |
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// Mentioned only for completeness. |
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// Solution 3 (implemented): request and cache all supported string |
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// descriptors at attachment time. String descriptors are typically small |
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// (a dozen characters, say), we only support 3 of them (manufacturer, |
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// product and serial number- not all of which may actually be supported |
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// by a particular device) and there is usually only 1 language, if that. |
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// Having cached the string descriptors, it is trivial to look them up |
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// later when the client wants. |
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// These arrays are tied together, i.e. iManufacturerStrings[2] is the |
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// manufacturer string in the language with ID iLangIds[2]. Note that this |
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// may be KNullDesC if the device doesn't support the manufacturer string |
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// descriptor, but there's still an entry in the array for it. |
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RArray<TUint> iLangIds; |
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RArray<TName> iManufacturerStrings; |
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RArray<TName> iProductStrings; |
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RArray<TName> iSerialNumberStrings; |
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TBool iHasIAD; |
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TBool iMultipleDriversFound; |
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TOtgDescriptor* iOtgDescriptor; // Owned |
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}; |
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148 |
|
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#endif // DEVICEPROXY_H |