IOUSBInterface.h   [plain text]

 * Copyright (c) 1998-2006 Apple Computer, Inc. All rights reserved.
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * and read it before using this
 * file.
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * Please see the License for the specific language governing rights and
 * limitations under the License.


#include <IOKit/IOService.h>
#include <libkern/c++/OSData.h>

#include <IOKit/usb/USB.h>
#include <IOKit/usb/IOUSBNub.h>
#include <IOKit/usb/IOUSBDevice.h>

    @class IOUSBInterface
    @abstract The object representing an interface of a device on the USB bus.
    @discussion This class provides functionality to find the pipes of an interface and
	to read the descriptors associated with an interface. When an interface is open()ed,
	all its pipes are created
class IOUSBInterface : public IOUSBNub
    friend class IOUSBInterfaceUserClient;

    IOUSBPipe * 			_pipeList[kUSBMaxPipes];
    const IOUSBConfigurationDescriptor *_configDesc;
    const IOUSBInterfaceDescriptor *	_interfaceDesc;
    IOUSBDevice *			_device;

    // these variable are the parsed interface descriptor
    UInt8				_bInterfaceNumber;
    UInt8				_bAlternateSetting;
    UInt8				_bNumEndpoints;
    UInt8				_bInterfaceClass;
    UInt8				_bInterfaceSubClass;
    UInt8				_bInterfaceProtocol;
    UInt8				_iInterface;

    struct ExpansionData {
        IOCommandGate		*_gate;
        IOWorkLoop			*_workLoop;
		bool				_needToClose;
    ExpansionData * _expansionData;

    // private methods
    virtual void 	ClosePipes(void);	// close all pipes (except pipe zero)
    virtual IOReturn	CreatePipes(void);	// open all pipes in the current interface/alt interface
    virtual void	SetProperties(void);	// update my property table with the correct properties		
    static IOUSBInterface *withDescriptors(const IOUSBConfigurationDescriptor *cfDesc, const IOUSBInterfaceDescriptor *ifDesc);
    static IOReturn	CallSuperOpen(OSObject *target, void *arg0, void *arg1, void *arg2, void *arg3);
    static IOReturn     CallSuperClose(OSObject *target, void *arg0, void *arg1, void *arg2, void *arg3);
	static UInt8 hex2char( UInt8 digit );
    virtual bool 	init(	const IOUSBConfigurationDescriptor *cfDesc,
                                const IOUSBInterfaceDescriptor *ifDesc);
    virtual bool 	attach(IOService *provider);
    virtual bool 	start( IOService * provider );
    virtual bool 	finalize(IOOptionBits options);
    virtual void 	stop(IOService *  provider);
    virtual IOReturn 	message( UInt32 type, IOService * provider,  void * argument = 0 );
    virtual bool 	didTerminate( IOService * provider, IOOptionBits options, bool * defer );
    virtual void 	free();	

        @function FindNextAltInterface
        return alternate interface descriptor satisfying the requirements specified in request, or NULL if there aren't any.
        request is updated with the properties of the returned interface.
        @param current interface descriptor to start searching from, NULL to start at alternate interface 0.
        @param request specifies what properties an interface must have to match.
        @result Pointer to a matching interface descriptor, or NULL if none match.
    virtual const IOUSBInterfaceDescriptor *FindNextAltInterface(const IOUSBInterfaceDescriptor *current,
                                                                 IOUSBFindInterfaceRequest *request);

	@function FindNextPipe
	Find a pipe of the interface that matches the requirements, either
	starting from the beginning of the interface's pipe list or from a specified
	@param current Pipe to start searching from, NULL to start from beginning of list.
	@param request Requirements for pipe to match, updated with the found pipe's
	@result Pointer to the pipe, or NULL if no pipe matches the request.
    virtual IOUSBPipe *FindNextPipe(IOUSBPipe *current, IOUSBFindEndpointRequest *request);

        @function FindNextAssociatedDescriptor
        Find the next descriptor of the requested type associated with the interface.
	@param current Descriptor to start searching from, NULL to start from beginning of list.
	@param type Descriptor type to search for, or kUSBAnyDesc to return any descriptor type.
	@result Pointer to the descriptor, or NULL if no matching descriptors found.
    virtual const IOUSBDescriptorHeader * FindNextAssociatedDescriptor(const void *current, UInt8 type);

        @function SetAlternateInterface
        Select the specified alternate interface.
        @param forClient The client requesting the alternate setting. This client must have the interface open in order to perform the request.
	@param alternateSetting Alternate setting (from the alternate interface's interface descriptor).
        @result exclusive access error if the interface is not open. otherwise the result of the transaction
    virtual IOReturn SetAlternateInterface(IOService *forClient, UInt16 alternateSetting);

    /* handleOpen / handleClose, overriden to open/close all the pipes */
    virtual bool handleOpen( 	IOService *	   forClient,
                                IOOptionBits	   options = 0,
                                void *		   arg = 0 );

    virtual bool open( 	IOService *	   forClient,
                                IOOptionBits	   options = 0,
                                void *		   arg = 0 );

    virtual void close( 	IOService *	   forClient,
			IOOptionBits	   options = 0  );
    virtual void handleClose(  	IOService *	   forClient,
                                IOOptionBits	   options = 0 );

        @function GetPipeObj
	returns a handle to the pipe at the corresponding index
        @param index value from zero to kUSBMaxPipes-1
	@result The IOUSBPipe object. Note that the client does not own a reference to this pipe, so the client should retain() the IOUSBPipe object if necessary.
    virtual IOUSBPipe *GetPipeObj(UInt8 index);
        @function GetConfigValue
	returns the device configuration value for the interface
	@result The device configuration value.
    virtual UInt8 GetConfigValue();
        @function GetDevice
        returns the device the interface is part of.
	@result Pointer to the IOUSBDevice object which is the parent of this IOUSBInterface object.
    virtual IOUSBDevice *GetDevice();
        @function GetInterfaceNumber
        returns the zero based value identifying the index in the array of concurrent
        interfaces supported by the current configuration
        @result the interface index
    virtual UInt8 GetInterfaceNumber();
        @function GetAlternateSetting
        returns the alternate setting for this interface.
        @result the alternate setting
    virtual UInt8 GetAlternateSetting();
        @function GetNumEndpoints
        returns the number of endpoints used by this interface (excluding
        device endpoint zero. If the value is zero, this interface only
        uses endpoint zero.
        @result the number of endpoints
    virtual UInt8 GetNumEndpoints();
        @function GetInterfaceClass
        returns the class code for this interface (assigned by the USB)
        a value of zero is reserved
        if the value is FFh, the interface class is vendor-specific
        all other values are reserved for assignment by the USB
        @result the interface class
    virtual UInt8 GetInterfaceClass();
        @function GetInterfaceSubClass
        returns the subclass code (assigned by the USB).
        These codes are qualified by the value returned by GetInterfaceClass
        @result the interface subclass
    virtual UInt8 GetInterfaceSubClass();
        @function GetInterfaceProtocol
        returns the protocol code (assigned by the USB).
        @result the interface index
    virtual UInt8 GetInterfaceProtocol();
        @function GetInterfaceStringIndex
        returns the index of the string descriptor describing the interface
        @result the string index
    virtual UInt8 GetInterfaceStringIndex();
	@function DeviceRequest
        @abstract Sends a control request to the default control pipe in the device (pipe zero)
        @param request The parameter block to send to the device
	@param completion Function to call when request completes. If omitted then
        DeviceRequest() executes synchronously, blocking until the request is complete.
    virtual IOReturn DeviceRequest(IOUSBDevRequest *request, IOUSBCompletion *completion = 0); 

    // Same but with a memory descriptor
    virtual IOReturn DeviceRequest(IOUSBDevRequestDesc *request, IOUSBCompletion *completion = 0);

    virtual bool matchPropertyTable(OSDictionary * table, SInt32 *score);

    OSMetaClassDeclareReservedUsed(IOUSBInterface,  0);
	@function GetEndpointProperties
        @abstract Returns the properties of an endpoint, possibly in an alternate interface.
        @param alternateSetting specifies the desired alternate setting
        @param endpointNumber specifies the endpoint number
        @param direction specifies the direction (kUSBIn, kUSBOut)
        @param transferType a pointer to hold the transfer type (kUSBControl, kUSBBulk, etc.) of the endpoint if found.
        @param maxPacketSize a pointer to hold the maxPacketSize in the endpoint descriptor.
        @param interval a pointer to hold the interval value in the endpoint descriptor.
	@result returns kIOReturnSuccess if the endpoint is found, and kIOUSBEndpointNotFound if it is not.
    virtual IOReturn GetEndpointProperties(UInt8 alternateSetting, UInt8 endpointNumber, UInt8 direction, UInt8 *transferType, UInt16 *maxPacketSize, UInt8 *interval);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  1);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  2);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  3);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  4);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  5);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  6);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  7);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  8);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  9);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  10);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  11);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  12);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  13);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  14);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  15);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  16);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  17);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  18);
    OSMetaClassDeclareReservedUnused(IOUSBInterface,  19);