本文整理汇总了C++中IOService::getChildEntry方法的典型用法代码示例。如果您正苦于以下问题：C++ IOService::getChildEntry方法的具体用法？C++ IOService::getChildEntry怎么用？C++ IOService::getChildEntry使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IOService的用法示例。
在下文中一共展示了IOService::getChildEntry方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: start
bool AppleGPIO::start(IOService *provider)
{
bool doSleepWake;
UInt32 i, flags, intCapable;
IOPlatformFunction *func;
const OSSymbol *functionSymbol = OSSymbol::withCString("InstantiatePlatformFunctions");
IOReturn retval;
IOService *parentDev;
OSData *data;
if (!super::start(provider)) return(false);
// set my id
data = OSDynamicCast(OSData, provider->getProperty("reg"));
if (!data) return(false);
fGPIOID = *(UInt32 *)data->getBytesNoCopy();
// find the gpio parent
parentDev = OSDynamicCast(IOService, provider->getParentEntry(gIODTPlane));
if (!parentDev) return(false);
fParent = OSDynamicCast(IOService, parentDev->getChildEntry(gIOServicePlane));
if (!fParent) return(false);
// Create the interrupt register/enable symbols
fSymIntRegister = OSSymbol::withCString(kIOPFInterruptRegister);
fSymIntUnRegister = OSSymbol::withCString(kIOPFInterruptUnRegister);
fSymIntEnable = OSSymbol::withCString(kIOPFInterruptEnable);
fSymIntDisable = OSSymbol::withCString(kIOPFInterruptDisable);
// Allocate our constant callPlatformFunction symbols so we can be called at interrupt time.
fSymGPIOParentWriteGPIO = OSSymbol::withCString(kSymGPIOParentWriteGPIO);
fSymGPIOParentReadGPIO = OSSymbol::withCString(kSymGPIOParentReadGPIO);
// Scan for platform-do-xxx functions
fPlatformFuncArray = NULL;
DLOG("AppleGPIO::start(%[email protected]%lx) - calling InstantiatePlatformFunctions\n",
provider->getName(), fGPIOID);
retval = provider->getPlatform()->callPlatformFunction(functionSymbol, false,
(void *)provider, (void *)&fPlatformFuncArray, (void *)0, (void *)0);
DLOG("AppleGPIO::start(%[email protected]%lx) - InstantiatePlatformFunctions returned %ld, pfArray %sNULL\n",
provider->getName(), fGPIOID, retval, fPlatformFuncArray ? "NOT " : "");
if (retval == kIOReturnSuccess && (fPlatformFuncArray != NULL))
{
// Find out if the GPIO parent supports interrupt events
if (fParent->callPlatformFunction(kSymGPIOParentIntCapable, false, &intCapable, 0, 0, 0)
!= kIOReturnSuccess)
{
intCapable = 0;
}
DLOG("AppleGPIO::start(%[email protected]%lx) - iterating platformFunc array, count = %ld\n",
provider->getName(), fGPIOID, fPlatformFuncArray->getCount());
doSleepWake = false;
UInt32 count = fPlatformFuncArray->getCount();
for (i = 0; i < count; i++)
{
if (func = OSDynamicCast(IOPlatformFunction, fPlatformFuncArray->getObject(i)))
{
flags = func->getCommandFlags();
DLOG ("AppleGPIO::start(%[email protected]%lx) - functionCheck - got function, flags 0x%lx, pHandle 0x%lx\n",
provider->getName(), fGPIOID, flags, func->getCommandPHandle());
// If this function is flagged to be performed at initialization, do it
if (flags & kIOPFFlagOnInit)
{
performFunction(func, (void *)1, (void *)0, (void *)0, (void *)0);
}
if ((flags & kIOPFFlagOnDemand) || ((flags & kIOPFFlagIntGen) && intCapable))
{
// Set the flag to indicate whether any of the platform functions are using
// interrupts -- this is used to allocate some locks that are needed for this
// functionality
if ((flags & kIOPFFlagIntGen) && (fIntGen == false))
{
fIntGen = true;
// Allocate event-related state variable locks
fClientsLock = IOSimpleLockAlloc();
fAmRegisteredLock = IOLockAlloc();
fAmEnabledLock = IOSimpleLockAlloc();
}
// This is a bit of overkill. Strictly speaking the lock needs to protect
// individual platformFunc array entries so that only one thread is executing
// that function at a time. The way we're using it here is only one of *any*
// of the platform functions can be executing at a time.
if (!fPFLock) fPFLock = IOLockAlloc(); // Use for both On-Demand and IntGen functions
// On-Demand and IntGen functions need to have a resource published
//.........这里部分代码省略.........