path: root/HID Utilities Source/HID_Config_Utilities.c

/*
	File:		HID_Config_Utilities.c

	Contains:   Implementation of the HID configuration utilities for the HID utilities.
    
	DRI: George Warner

	Copyright:	Copyright © 2002 Apple Computer, Inc., All Rights Reserved

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*/

#include <stdlib.h> // malloc
#include <time.h> // clock

#include <IOKit/hid/IOHIDUsageTables.h>

#include "HID_Utilities_Internal.h"
#include "HID_Utilities_External.h"

// ---------------------------------
// polls all devices and elements for a change greater than kPercentMove.  Times out after given time
// returns 1 and pointer to device and element if found
// returns 0 and NULL for both parameters if not found

unsigned char HIDConfigureAction (pRecDevice * ppDevice, pRecElement * ppElement, float timeout)
{
    long numDevices, maxElements = 0;
    long * saveValueArray;
    pRecDevice pDevice = NULL;
    pRecElement pElement = NULL;
    short deviceNum = 0;
    unsigned char found = 0, done = 0;
	clock_t start = clock (), end;
    
     if (!HIDHaveDeviceList ())   // if we do not have a device list
		if (0 == HIDBuildDeviceList (kHIDPage_GenericDesktop, 0)) // if we could not build another list (use generic page)
			return 0; // return 0

    // build list of device and elements to save current values
    numDevices = HIDCountDevices ();
    pDevice = HIDGetFirstDevice ();
    while (pDevice)
    {
		long numElements = HIDCountDeviceElements (pDevice, kHIDElementTypeInput);
		if (numElements > maxElements)
			maxElements = numElements;
		pDevice = HIDGetNextDevice (pDevice);
	}
	saveValueArray = (long *) malloc (sizeof (long) * numDevices * maxElements); // 2D array to save values
	bzero(saveValueArray,sizeof (long) * numDevices * maxElements); // clear array

	// store current values
	deviceNum = 0;
	pDevice = HIDGetFirstDevice ();
	while (pDevice)
	{
		short elementNum = 0;
		pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeInput);
		while (pElement)
		{
			*(saveValueArray + (deviceNum * maxElements) + elementNum) = HIDGetElementValue (pDevice, pElement);
			pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeInput); 
			elementNum++;
		}
		pDevice = HIDGetNextDevice (pDevice);
		deviceNum++;
    }
    
    // poll all devices and elements, compare current value to save +/- kPercentMove
    while ((!found) && (!done))
    {
		double secs;
		// are we done?
		end = clock();
		secs = (double)(end - start) / CLOCKS_PER_SEC;
		if (secs > timeout)
			done = 1;
		deviceNum = 0;
		pDevice = HIDGetFirstDevice ();
		while (pDevice)
		{
			short elementNum = 0;
			pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeInput);
			while (pElement)
			{
				// ignore force feedback devices AND arrays
				if ((kHIDPage_PID != pElement->usagePage) && (-1 != pElement->usage))
				{
					long initialValue = *(saveValueArray + (deviceNum * maxElements) + elementNum);
					long value = HIDGetElementValue (pDevice, pElement);
					long delta = (float)(pElement->max - pElement->min) * kPercentMove * 0.01;

					if (((initialValue + delta) < value) || ((initialValue - delta) > value))
					{
						found = 1;
						break;
					}
				}
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeInput); 
				elementNum++;
			}
			if (found)
				break;
			pDevice = HIDGetNextDevice (pDevice);
			deviceNum++;
		}
    }
    
    // return device and element moved
    if (found)
    {
		*ppDevice = pDevice;
		*ppElement = pElement;
		return 1;
    }
	else
	{
		*ppDevice = NULL;
		*ppElement = NULL;
		return 0;
	}
}

// ---------------------------------
// takes input records, save required info
// assume file is open and at correct position.
// will always write to file (if file exists) size of recSaveHID, even if device and or element is bad

void HIDSaveElementConfig (FILE * fileRef, pRecDevice pDevice, pRecElement pElement, long actionCookie)
{
	recSaveHID saveRec;

	if (HIDIsValidElement(pDevice,pElement))
	{
		// clear rec
		bzero(&saveRec,sizeof(recSaveHID));

		saveRec.actionCookie = actionCookie;

		// must save
		// actionCookie
		// Device: serial,vendorID, productID, location, usagePage, usage
		// Element: cookie, usagePage, usage,
		// need to add serial number when I have a test case
		
		saveRec.vendorID = pDevice->vendorID;
		saveRec.productID = pDevice->productID;
		saveRec.locID = pDevice->locID;
		saveRec.usage = pDevice->usage;
		saveRec.usagePage = pDevice->usagePage;

		saveRec.usagePageE = pElement->usagePage;
		saveRec.usageE = pElement->usage;
		saveRec.cookie = pElement->cookie;

		// write to file
		if (fileRef)
			fwrite ((void *)&saveRec, sizeof (recSaveHID), 1, fileRef);
	}
}

// ---------------------------------
// take file, read one record (assume file position is correct and file is open)
// search for matching device
// return pDevice, pElement and cookie for action
 
long HIDRestoreElementConfig (FILE * fileRef, pRecDevice * ppDevice, pRecElement * ppElement)
{
    // Device: serial,vendorID, productID, location, usagePage, usage
    // Element: cookie, usagePage, usage,
    
    pRecDevice pDevice, pFoundDevice = NULL;
    pRecElement pElement, pFoundElement = NULL;
 
    recSaveHID restoreRec;
    
    fread ((void *) &restoreRec, 1, sizeof (recSaveHID), fileRef);

    // compare to current device list for matches
    // look for device
    if (restoreRec.locID && restoreRec.vendorID && restoreRec.productID)
	{ // look for specific device type plug in to same port
		pDevice = HIDGetFirstDevice ();
		while (pDevice)
		{
			if ((restoreRec.locID == pDevice->locID) &&
			(restoreRec.vendorID == pDevice->vendorID) &&
			(restoreRec.productID == pDevice->productID))
			pFoundDevice = pDevice;
			if (pFoundDevice)
				break;
			pDevice = HIDGetNextDevice (pDevice);
		}
		if (pFoundDevice)
		{
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if (restoreRec.cookie == pElement->cookie)
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
			// if no cookie match (should NOT occur) match on usage
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((restoreRec.usageE == pElement->usage) &&
					(restoreRec.usagePageE == pElement->usagePage))
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
		}
	}
    // if we have not found a match, look at just vendor and product
    if ((NULL == pFoundDevice) &&
	(restoreRec.vendorID && restoreRec.productID))
    {
		pDevice = HIDGetFirstDevice ();
		while (pDevice)
		{
			if ((restoreRec.vendorID == pDevice->vendorID) &&
			(restoreRec.productID == pDevice->productID))
			pFoundDevice = pDevice;
			if (pFoundDevice)
			break;
			pDevice = HIDGetNextDevice (pDevice);
		}
		// match elements by cookie since same device type
		if (pFoundDevice)
		{
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if (restoreRec.cookie == pElement->cookie)
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
			// if no cookie match (should NOT occur) match on usage
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((restoreRec.usageE == pElement->usage) &&
					(restoreRec.usagePageE == pElement->usagePage))
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
		}
    }
    // if we have not found a match look for just same type of device
    if ((NULL == pFoundDevice) && (restoreRec.usage && restoreRec.usagePage))
    {
		pDevice = HIDGetFirstDevice ();
		while (pDevice)
		{
			if ((restoreRec.usage == pDevice->usage) && (restoreRec.usagePage == pDevice->usagePage))
				pFoundDevice = pDevice;
			if (pFoundDevice)
				break;
			pDevice = HIDGetNextDevice (pDevice);
		}
		// match elements by type
		if (pFoundDevice)
		{
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((restoreRec.usageE == pElement->usage) &&
					(restoreRec.usagePageE == pElement->usagePage))
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
		}
    }
    // if still not found just get first device
    if (NULL == pFoundDevice)
    {
		pFoundDevice = HIDGetFirstDevice ();
		// match elements by type
		if (pFoundDevice)
		{
			pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
			while (pElement)
			{
				if ((restoreRec.usageE == pElement->usage) &&
					(restoreRec.usagePageE == pElement->usagePage))
					pFoundElement = pElement;
				if (pFoundElement)
					break;
				pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO); 
			}
		}
    }
    if ((NULL == pFoundDevice) || (NULL == pFoundElement))
    {
		// no HID device
		*ppDevice = NULL;
		*ppElement = NULL;
		return restoreRec.actionCookie;
    }
    else
    {
		// no HID device
		*ppDevice = pFoundDevice;
		*ppElement = pFoundElement;
		return restoreRec.actionCookie;
    }
  
}

// ---------------------------------
// Find the specified preference in the specified application
// search for matching device and element
// return pDevice, pElement that matches

Boolean HIDRestoreElementPref (CFStringRef keyCFStringRef, CFStringRef appCFStringRef, pRecDevice * ppDevice, pRecElement * ppElement)
{
	Boolean found = false;

	if ((NULL != keyCFStringRef) && (NULL != appCFStringRef) && (NULL != ppDevice) && (NULL != ppElement))
	{
		CFPropertyListRef prefCFPropertyListRef = CFPreferencesCopyAppValue(keyCFStringRef, appCFStringRef);

		if (NULL != prefCFPropertyListRef)
		{
			if (CFStringGetTypeID() == CFGetTypeID(prefCFPropertyListRef))
			{
				char buffer[256];

				if (CFStringGetCString((CFStringRef) prefCFPropertyListRef, buffer, sizeof(buffer), kCFStringEncodingASCII))
				{
					recDevice	searchDevice;
					recElement	searchElement;
					int count = sscanf(buffer, "d:{v:%ld, p:%ld, l:%ld, p:%ld, u:%ld}, e:{t:%ld, p:%ld, u:%ld, c:%ld}", 
						&searchDevice.vendorID, &searchDevice.productID, &searchDevice.locID, &searchDevice.usagePage, &searchDevice.usage, 
						&searchElement.type, &searchElement.usagePage, &searchElement.usage, (long*) &searchElement.cookie);

					if (9 == count)	// if we found all nine parametersÉ
					{	// and can find a device & element that matches theseÉ
						if (HIDFindActionDeviceAndElement(&searchDevice, &searchElement,ppDevice, ppElement))
						{
							found = true;
						}
					}
				}
			}
			else
			{
				// We found the entry with this key but it's the wrong type; delete it.
				CFPreferencesSetAppValue(keyCFStringRef, NULL, appCFStringRef);
				(void) CFPreferencesAppSynchronize(appCFStringRef);
			}
			CFRelease(prefCFPropertyListRef);
		}
	}
	return found;
}

// ---------------------------------
// Save the device & element values into the specified key in the specified applications preferences

Boolean HIDSaveElementPref (const CFStringRef keyCFStringRef, CFStringRef appCFStringRef, pRecDevice pDevice, pRecElement pElement)
{
	Boolean success = false;

	if ((NULL != keyCFStringRef) && (NULL != appCFStringRef) && HIDIsValidElement(pDevice,pElement))
	{
		CFStringRef prefCFStringRef =
			CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("d:{v:%ld, p:%ld, l:%ld, p:%ld, u:%ld}, e:{t:%ld, p:%ld, u:%ld, c:%ld}"), 
							pDevice->vendorID, pDevice->productID, pDevice->locID, pDevice->usagePage, pDevice->usage, 
							pElement->type, pElement->usagePage, pElement->usage, pElement->cookie);

		if (NULL != prefCFStringRef)
		{
			CFPreferencesSetAppValue(keyCFStringRef, prefCFStringRef, kCFPreferencesCurrentApplication);
			CFRelease(prefCFStringRef);
			success = true;
		}
	}
	return success;
}