Redline/HID_Transaction_Utilities.c

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/*
File: HID_Transaction_Utilities.h
Contains: Definitions of the HID queue functions for the HID utilites.
DRI: George Warner
Copyright: Copyright <EFBFBD> 2002 Apple Computer, 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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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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*/
#include <CoreServices/CoreServices.h>
#include "HID_Utilities_Internal.h"
#include "HID_Utilities_External.h"
// ==================================
// private functions
// creates a transaction for a device, allocates and creates the transaction interface if required
static IOReturn hid_CreateTransaction(pRecDevice pDevice)
{
IOReturn result = kIOReturnSuccess;
if (HIDIsValidDevice(pDevice))
{
if (NULL == pDevice->transaction) // if we don't already have a transaction<6F>
{
if (NULL != pDevice->interface) // and we do have an interface<63>
{
pDevice->transaction = (void *) (*(IOHIDDeviceInterface**) pDevice->interface)->allocOutputTransaction (pDevice->interface); // alloc Transaction
if (pDevice->transaction) // if it was successful<75>
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->create (pDevice->transaction); // create actual transaction
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nFailed to create transaction via create: error = %ld.", result);
}
else
{
HIDReportError ("\nhid_CreateTransaction failed to allocOutputTransaction");
if (!result)
result = kIOReturnError; // synthesis error
}
}
else
HIDReportErrorNum ("\nhid_CreateTransaction failed: Device inteface does not exist.", result);
}
}
return result;
}
// ==================================
// public functions
// ---------------------------------
// add an element to a Transaction
unsigned long HIDTransactionAddElement(pRecDevice pDevice, pRecElement pElement)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->addElement (pDevice->transaction,pElement->cookie); // add element
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionAddElement failed to add Element: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionAddElement failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
// removes an element from a Transaction
unsigned long HIDTransactionRemoveElement(pRecDevice pDevice, pRecElement pElement)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->removeElement (pDevice->transaction,pElement->cookie); // remove element
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionRemoveElement failed to remove Element: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionRemoveElement failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
// return true if this transaction contains this element
Boolean HIDTransactionHasElement(pRecDevice pDevice, pRecElement pElement)
{
Boolean result = false;
if (HIDIsValidElement(pDevice,pElement))
{
(void) hid_CreateTransaction(pDevice);
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->hasElement (pDevice->transaction,pElement->cookie); // remove element
}
else
{
HIDReportError ("\nHIDTransactionHasElement failed: no transaction interface");
}
}
return result;
}
/* This changes the default value of an element, when the values of the */
/* elements are cleared, on clear or commit, they are reset to the */
/* default value */
/* This call can be made on elements that are not in the transaction, but */
/* has undefined behavior if made on elements not in the transaction */
/* which are later added to the transaction. */
/* In other words, an element should be added before its default is */
/* set, for well defined behavior. */
unsigned long HIDTransactionSetElementDefault(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->setElementDefault (pDevice->transaction,pElement->cookie, pValueEvent);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionSetElementDefault failed to set Element Default: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionSetElementDefault failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
/* Get the current setting of an element's default value */
unsigned long HIDTransactionGetElementDefault(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->getElementDefault (pDevice->transaction,pElement->cookie, pValueEvent);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionGetElementDefault failed to get Element Default: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionGetElementDefault failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
/* Add a change to the transaction, by setting an element value */
/* The change is not actually made until it is commited */
/* The element must be part of the transaction or this call will fail */
unsigned long HIDTransactionSetElementValue(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->setElementValue (pDevice->transaction,pElement->cookie, pValueEvent);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionSetElementValue failed to set Element Default: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionSetElementValue failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
/* Get the current setting of an element value */
unsigned long HIDTransactionGetElementValue(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidElement(pDevice,pElement))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->getElementValue (pDevice->transaction,pElement->cookie, pValueEvent);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionGetElementValue failed to get Element Default: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionGetElementValue failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
/* Commit the transaction, or clear all the changes and start over */
unsigned long HIDTransactionCommit(pRecDevice pDevice)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidDevice(pDevice))
{
if (pDevice->transaction)
{
#if 0000
// NOTE: this code is to workaround a bug where if you commit transactions
// too fast then some of the reports get dropped.
// (fixed in 10.2.1)
static AbsoluteTime nextTime = {0,0}; // first time this should be no delay
if (nextTime.hi || nextTime.lo)
MPDelayUntil(&nextTime);
#endif
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->commit (pDevice->transaction,-1,NULL,NULL,NULL);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionCommit failed to commit: error = %ld.", result);
#if 0000
nextTime = AddDurationToAbsolute(20 * kDurationMillisecond,UpTime());
#endif
}
else
{
HIDReportError ("\nHIDTransactionCommit failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}
/* Clear all the changes and start over */
unsigned long HIDTransactionClear(pRecDevice pDevice)
{
IOReturn result = hid_CreateTransaction(pDevice);
if (HIDIsValidDevice(pDevice))
{
if (pDevice->transaction)
{
result = (*(IOHIDOutputTransactionInterface**) pDevice->transaction)->clear (pDevice->transaction);
if (kIOReturnSuccess != result)
HIDReportErrorNum ("\nHIDTransactionClear failed to get Element Default: error = %ld.", result);
}
else
{
HIDReportError ("\nHIDTransactionClear failed: no transaction interface");
if (!result)
result = kIOReturnError; // synthesis error
}
}
return result;
}