SimpleDriver.cpp

/*
    File:           SimpleDriver.cpp
    
    Description:    This file shows how to implement a basic I/O Kit driver kernel extension (KEXT).
 
    Copyright:      Copyright © 2001-2008 Apple Inc. All rights reserved.
    
    Disclaimer:     IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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                    please do not use, install, modify or redistribute this Apple software.
                    
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                    copyrights in this original Apple software (the "Apple Software"), to use,
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                    may be infringed by your derivative works or by other works in which the Apple
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                    The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
                    WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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                    PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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    Change History (most recent first):
 
            2.0         08/13/2008          Add Leopard user client API for supporting 64-bit user processes.
                                            Now requires Xcode 3.0 or later to build.
            
            1.1         05/22/2007          User client performs endian swapping when called from a user process 
                                            running using Rosetta. Updated to produce a universal binary.
                                            Now requires Xcode 2.2.1 or later to build.
            
            1.0d3       01/14/2003          New sample.
 
*/
 
 
#include <IOKit/IOLib.h>
#include "SimpleDriver.h"
 
#define super IOService
 
// Even though we are defining the convenience macro super for the superclass, you must use the actual class name
// in the OS*MetaClass macros. Note that the class name is different when supporting Mac OS X 10.4.
 
#if MAC_OS_X_VERSION_MIN_REQUIRED <= MAC_OS_X_VERSION_10_4
OSDefineMetaClassAndStructors(com_apple_dts_driver_SimpleDriver_10_4, IOService)
#else
OSDefineMetaClassAndStructors(com_apple_dts_driver_SimpleDriver, IOService)
#endif
 
bool SimpleDriverClassName::start(IOService* provider)
{
    bool    success;
    
    IOLog("%s[%p]::%s(%p)\n", getName(), this, __FUNCTION__, provider);
    
    success = super::start(provider);
        
    if (success) {
        // Publish ourselves so clients can find us
        registerService();
    }
    
    return success;
}
 
 
// We override stop only to log that it has been called to make it easier to follow the driver's lifecycle.
void SimpleDriverClassName::stop(IOService* provider)
{
    IOLog("%s[%p]::%s(%p)\n", getName(), this, __FUNCTION__, provider);
    
    super::stop(provider);
}
 
 
// We override init only to log that it has been called to make it easier to follow the driver's lifecycle.
// Production drivers would only need to override init if they want to initialize data members.
bool SimpleDriverClassName::init(OSDictionary* dictionary)
{
    if (!super::init(dictionary)) {
        return false;
    }
 
    // This IOLog must follow super::init because getName relies on the superclass initialization.
    IOLog("%s[%p]::%s(%p)\n", getName(), this, __FUNCTION__, dictionary);
 
    // This is where you could set the initial value of your driver's data members.
    
    return true;
}
 
 
// We override free only to log that it has been called to make it easier to follow the driver's lifecycle.
void SimpleDriverClassName::free(void)
{
    IOLog("%s[%p]::%s()\n", getName(), this, __FUNCTION__);
    
    super::free();
}
 
 
// We override probe only to log that it has been called to make it easier to follow the driver's lifecycle.
// Production drivers can override probe if they need to make an active decision whether the driver is appropriate for
// the provider.
IOService* SimpleDriverClassName::probe(IOService* provider, SInt32* score)
{
    IOLog("%s[%p]::%s(%p, %p)\n", getName(), this, __FUNCTION__, provider, score);
        
    IOService *res = super::probe(provider, score);
 
    return res;
}
 
 
// We override willTerminate only to log that it has been called to make it easier to follow the driver's lifecycle.
//
// willTerminate is called at the beginning of the termination process. It is a notification
// that a provider has been terminated, sent before recursing up the stack, in root-to-leaf order.
//
// This is where any pending I/O should be terminated. At this point the user client has been marked
// inactive and any further requests from the user process should be returned with an error.
bool SimpleDriverClassName::willTerminate(IOService* provider, IOOptionBits options)
{
    IOLog("%s[%p]::%s(%p, %ld)\n", getName(), this, __FUNCTION__, provider, options);
    
    return super::willTerminate(provider, options);
}
 
 
// We override didTerminate only to log that it has been called to make it easier to follow the driver's lifecycle.
//
// didTerminate is called at the end of the termination process. It is a notification
// that a provider has been terminated, sent after recursing up the stack, in leaf-to-root order.
bool SimpleDriverClassName::didTerminate(IOService* provider, IOOptionBits options, bool* defer)
{
    IOLog("%s[%p]::%s(%p, %ld, %p)\n", getName(), this, __FUNCTION__, provider, options, defer);
    
    return super::didTerminate(provider, options, defer);
}
 
 
// We override terminate only to log that it has been called to make it easier to follow the driver's lifecycle.
// Production drivers will rarely need to override terminate. Termination processing should be done in
// willTerminate or didTerminate instead.
bool SimpleDriverClassName::terminate(IOOptionBits options)
{
    bool    success;
    
    IOLog("%s[%p]::%s(%ld)\n", getName(), this, __FUNCTION__, options);
 
    success = super::terminate(options);
    
    return success;
}
 
 
// We override finalize only to log that it has been called to make it easier to follow the driver's lifecycle.
// Production drivers will rarely need to override finalize.
bool SimpleDriverClassName::finalize(IOOptionBits options)
{
    bool    success;
    
    IOLog("%s[%p]::%s(%ld)\n", getName(), this, __FUNCTION__, options);
    
    success = super::finalize(options);
    
    return success;
}
 
 
IOReturn SimpleDriverClassName::ScalarIStructI(uint32_t inNumber, MySampleStruct* inStruct, uint32_t inStructSize)
{
    IOLog("%s[%p]::%s(inNumber = %d, field1 = %lld, field1 = %lld, inStructSize = %d)\n", getName(), this, __FUNCTION__,
          inNumber, inStruct->field1, inStruct->field2, inStructSize);
    
    return kIOReturnSuccess;
}
 
 
IOReturn SimpleDriverClassName::ScalarIStructO(uint32_t inNumber1, uint32_t inNumber2, MySampleStruct* outStruct, uint32_t* outStructSize)
{
    IOLog("%s[%p]::%s(inNumber1 = %d, inNumber2 = %d)\n", getName(), this, __FUNCTION__, inNumber1, inNumber2);
    
    // The scalars inNumber1 and inNumber2 are automatically endian-swapped by the user client mechanism.
    // The user client will swap the fields in outStruct if necessary.
    
    // The output is simply the two input scalars copied to the output struct.
    outStruct->field1 = inNumber1;
    outStruct->field2 = inNumber2;
    *outStructSize = sizeof(MySampleStruct);
    
    return kIOReturnSuccess;
}
 
 
IOReturn SimpleDriverClassName::ScalarIScalarO(uint32_t inNumber1, uint32_t inNumber2, uint32_t* outNumber)
{
    IOLog("%s[%p]::%s(inNumber1 = %d, inNumber2 = %d)\n", getName(), this, __FUNCTION__, inNumber1, inNumber2);
    
    // The output is the product of the two input scalars.
    *outNumber = inNumber1 * inNumber2;
    
    return kIOReturnSuccess;
}
 
 
IOReturn SimpleDriverClassName::StructIStructO(MySampleStruct* inStruct, MySampleStruct* outStruct, uint32_t inStructSize, uint32_t* outStructSize)
{
    IOLog("%s[%p]::%s(field1 = %lld, field2 = %lld, inStructSize = %d)\n", getName(), this, __FUNCTION__, 
          inStruct->field1, inStruct->field2, inStructSize);
    
    // The output is simply the fields from the input struct copied to the output struct.
    outStruct->field1 = inStruct->field1;
    outStruct->field2 = inStruct->field2;
    *outStructSize = sizeof(MySampleStruct);
    
    return kIOReturnSuccess;
}