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;
}