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<pre class="sourcecodebox">/*
* HID_Config_Utilities.c
* HID Config Save
*
* Created by ggs on Thu May 24 2001.
* Copyright (c) 2001 Apple. All rights reserved.
*
*/
#include <stdlib.h> // malloc
#include <time.h> // clock
#include "HID_Utilities_Internal.h"
#include "HID_Utilities_External.h"
// ---------------------------------
// polls single device's elements for a change greater than kPercentMove. Times out after given time
// returns 1 and pointer to element if found
// returns 0 and NULL for both parameters if not found
unsigned char HIDConfigureSingleDeviceAction (pRecDevice pDevice, pRecElement * ppElement, float timeout)
{
unsigned long maxElements = 0;
long * saveValueArray;
pRecElement pElement = NULL;
unsigned char found = 0, done = 0;
clock_t start = clock (), end;
unsigned long i;
if (!pDevice)
return 0;
if (0 == HIDHaveDeviceList ()) // if we do not have a device list
return 0; // return 0
// build list of device and elements to save current values
maxElements = HIDCountDeviceElements (pDevice, kHIDElementTypeIO);
saveValueArray = (long *) malloc (sizeof (long) * maxElements); // 2D array to save values
for (i = 0; i <maxElements; i++) // clear array
*(saveValueArray + i) = 0x00000000;
// store current values
short elementNum = 0;
pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
while (pElement)
{
*(saveValueArray + elementNum) = HIDGetElementValue (pDevice, pElement);
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
elementNum++;
}
// 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;
short elementNum = 0;
pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
while (pElement)
{
long initialValue = *(saveValueArray + 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, kHIDElementTypeIO);
elementNum++;
}
}
// return device and element moved
if (found) {
*ppElement = pElement;
return 1;
} else {
*ppElement = NULL;
return 0;
}
}
// ---------------------------------
// 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)
{
unsigned long devices, maxElements = 0;
long * saveValueArray;
pRecDevice pDevice = NULL;
pRecElement pElement = NULL;
short deviceNum = 0;
unsigned char found = 0, done = 0;
clock_t start = clock (), end;
unsigned long i;
if (0 == HIDHaveDeviceList ()) // if we do not have a device list
if (0 == HIDBuildDeviceList (0, 0)) // if we could not build anorther list (use generic usage and page)
return 0; // return 0
// build list of device and elements to save current values
devices = HIDCountDevices ();
pDevice = HIDGetFirstDevice ();
while (pDevice)
{
if (HIDCountDeviceElements (pDevice, kHIDElementTypeIO) > maxElements)
maxElements = HIDCountDeviceElements (pDevice, kHIDElementTypeIO);
pDevice = HIDGetNextDevice (pDevice);
}
saveValueArray = (long *) malloc (sizeof (long) * devices * maxElements); // 2D array to save values
for (i = 0; i < devices * maxElements; i++) // clear array
*(saveValueArray + i) = 0x00000000;
// store current values
deviceNum = 0;
pDevice = HIDGetFirstDevice ();
while (pDevice)
{
short elementNum = 0;
pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
while (pElement)
{
*(saveValueArray + (deviceNum * maxElements) + elementNum) = HIDGetElementValue (pDevice, pElement);
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
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, kHIDElementTypeIO);
while (pElement)
{
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, kHIDElementTypeIO);
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)
{
// must save:
// actionCookie
// Device: serial,vendorID, productID, location, usagePage, usage
// Element: cookie, usagePage, usage,
recSaveHID saveRec;
HIDSetElementConfig (&saveRec, pDevice, pElement, actionCookie);
// 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,
recSaveHID restoreRec;
fread ((void *) &restoreRec, 1, sizeof (recSaveHID), fileRef);
return HIDGetElementConfig (&restoreRec, ppDevice, ppElement);
}
// ---------------------------------
// Set up a config record for saving
// takes an input records, returns record user can save as they want
// Note: the save rec must be pre-allocated by the calling app and will be filled out
void HIDSetElementConfig (pRecSaveHID pConfigRec, pRecDevice pDevice, pRecElement pElement, long actionCookie)
{
// must save:
// actionCookie
// Device: serial,vendorID, productID, location, usagePage, usage
// Element: cookie, usagePage, usage,
pConfigRec->actionCookie = actionCookie;
// device
// need to add serial number when I have a test case
if (pDevice && pElement) {
pConfigRec->vendorID = pDevice->vendorID;
pConfigRec->productID = pDevice->productID;
pConfigRec->locID = pDevice->locID;
pConfigRec->usage = pDevice->usage;
pConfigRec->usagePage = pDevice->usagePage;
pConfigRec->usagePageE = pElement->usagePage;
pConfigRec->usageE = pElement->usage;
pConfigRec->minReport = pElement->minReport;
pConfigRec->maxReport = pElement->maxReport;
pConfigRec->cookie = pElement->cookie;
} else {
pConfigRec->vendorID = 0;
pConfigRec->productID = 0;
pConfigRec->locID = 0;
pConfigRec->usage = 0;
pConfigRec->usagePage = 0;
pConfigRec->usagePageE = 0;
pConfigRec->usageE = 0;
pConfigRec->minReport = 0;
pConfigRec->maxReport = 0;
pConfigRec->cookie = 0;
}
}
// ---------------------------------
#if 0
void HIDDumpConfig (pRecSaveHID pConfigRec)
{
printf ("Config Record for action: %ld\n vendor: %ld product: %ld location: %ld\n usage: %ld usagePage: %ld\n usagePageE: %ld usageE: %ld\n minReport: %ld maxReport: %ld\n cookie: %ld\n", pConfigRec->actionCookie, pConfigRec->vendorID, pConfigRec->productID, pConfigRec->locID, pConfigRec->usage, pConfigRec->usagePage, pConfigRec->usagePageE, pConfigRec->usageE, pConfigRec->minReport, pConfigRec->maxReport, pConfigRec->cookie);
}
#endif // 0
// ---------------------------------
// Get matching element from config record
// takes a pre-allocated and filled out config record
// search for matching device
// return pDevice, pElement and cookie for action
long HIDGetElementConfig (pRecSaveHID pConfigRec, pRecDevice * ppDevice, pRecElement * ppElement)
{
if (!pConfigRec->locID && !pConfigRec->vendorID && !pConfigRec->productID && !pConfigRec->usage && !pConfigRec->usagePage) { // early out
*ppDevice = NULL;
*ppElement = NULL;
return pConfigRec->actionCookie;
}
pRecDevice pDevice, pFoundDevice = NULL;
pRecElement pElement, pFoundElement = NULL;
// compare to current device list for matches
// look for device
if (pConfigRec->locID && pConfigRec->vendorID && pConfigRec->productID)
{ // look for specific device type plug in to same port
pDevice = HIDGetFirstDevice ();
while (pDevice)
{
if ((pConfigRec->locID == pDevice->locID) &&
(pConfigRec->vendorID == pDevice->vendorID) &&
(pConfigRec->productID == pDevice->productID))
pFoundDevice = pDevice;
if (pFoundDevice)
break;
pDevice = HIDGetNextDevice (pDevice);
}
if (pFoundDevice)
{
pElement = HIDGetFirstDeviceElement (pFoundDevice, kHIDElementTypeIO);
while (pElement)
{
if (pConfigRec->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 ((pConfigRec->usageE == pElement->usage) &&
(pConfigRec->usagePageE == pElement->usagePage))
pFoundElement = pElement;
if (pFoundElement)
break;
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
}
if (pElement) {
// set min and max values if same device
pElement->minReport = pConfigRec->minReport;
pElement->maxReport = pConfigRec->maxReport;
}
}
}
// if we have not found a match, look at just vendor and product
if ((NULL == pFoundDevice) && (pConfigRec->vendorID && pConfigRec->productID))
{
pDevice = HIDGetFirstDevice ();
while (pDevice)
{
if ((pConfigRec->vendorID == pDevice->vendorID) &&
(pConfigRec->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 (pConfigRec->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 ((pConfigRec->usageE == pElement->usage) &&
(pConfigRec->usagePageE == pElement->usagePage))
pFoundElement = pElement;
if (pFoundElement)
break;
pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
}
if (pElement) {
// set min and max values if same device
pElement->minReport = pConfigRec->minReport;
pElement->maxReport = pConfigRec->maxReport;
}
}
}
// can't find matching device return NULL, do not return first device
if ((NULL == pFoundDevice) || (NULL == pFoundElement))
{
// no HID device
*ppDevice = NULL;
*ppElement = NULL;
return pConfigRec->actionCookie;
}
else
{
// HID device
*ppDevice = pFoundDevice;
*ppElement = pFoundElement;
return pConfigRec->actionCookie;
}
}
</pre>
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