HID_Queue_Utilities.c

/*
    File:       HID_Queue_Utilities.c
 
    Contains:   Implementation of the HID queue functions for the HID utilites.
    
    DRI: George Warner
 
    Copyright:  Copyright © 2002 Apple Computer, Inc., All Rights Reserved
 
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*/
 
//#include <IOKit/hid/IOHIDDevice.h>
 
#include "HID_Utilities_Internal.h"
#include "HID_Utilities_External.h"
 
// ==================================
// compiler directives
// ==================================
#define USE_ASYNC_EVENTS TRUE
#define REPORT_ERRORS FALSE
// ==================================
#if REPORT_ERRORS
#define HIDREPORTERRORNUM(s,n) HIDReportErrorNum(s,n)
#define HIDREPORTERROR(s)       HIDReportError(s)
#else
#define HIDREPORTERRORNUM(s,n)  do {} while (false)
#define HIDREPORTERROR(s)       do {} while (false)
#endif
// ==================================
// private functions
// ==================================
 
// creates a queue for a device
 
static IOReturn hid_CreateQueue (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidDevice(pDevice))
    {
        if (NULL == pDevice->queue) // do we already have a queue
        {
            if (NULL != pDevice->interface)
            {
                pDevice->queue = (void *) (*(IOHIDDeviceInterface**) pDevice->interface)->allocQueue (pDevice->interface); // alloc queue
                if (pDevice->queue)
                {
                    result = (*(IOHIDQueueInterface**) pDevice->queue)->create (pDevice->queue, 0, kDeviceQueueSize); // create actual queue
                    if (kIOReturnSuccess != result)
                        HIDREPORTERRORNUM ("hid_CreateQueue - Failed to create queue via create", result);
                }
                else
                {
                    HIDREPORTERROR ("hid_CreateQueue - Failed to alloc IOHIDQueueInterface ** via allocQueue");
                    result = kIOReturnError; // synthesis error
                }
            }
            else
                HIDREPORTERRORNUM ("hid_CreateQueue - Device inteface does not exist for queue creation", result);
        }
    }
    else
        HIDREPORTERRORNUM ("hid_CreateQueue - Invalid Device", result);
    return result;
}
 
// ---------------------------------
// returns true if queue is empty false otherwise
// error if no device, empty if no queue
 
static unsigned char hid_IsDeviceQueueEmpty (pRecDevice pDevice)
{
    if (HIDIsValidDevice(pDevice))  // need valid device
    {
        if (pDevice->queue) // and queue
        {
            pRecElement pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
            while (pElement)
            {
                if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
                    return false;
                pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
            } 
        }
        else
            HIDREPORTERROR ("hid_IsDeviceQueueEmpty - no queue.");
    }
    else
        HIDREPORTERROR ("hid_IsDeviceQueueEmpty - Invalid device.");
    return true;   
}
 
// ---------------------------------
// disposes and releases queue, sets queue to NULL,.
// Note: will have no effect if device or queue do not exist
 
static IOReturn hid_DisposeReleaseQueue (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidDevice(pDevice))  // need valid device
    {
        if (pDevice->queue) // and queue
        {
            // stop queue
            result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to stop queue.", result);
            // dispose of queue
            result = (*(IOHIDQueueInterface**) pDevice->queue)->dispose (pDevice->queue);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to dipose queue.", result);
            // release the queue
            result = (*(IOHIDQueueInterface**) pDevice->queue)->Release (pDevice->queue);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("hid_DisposeReleaseQueue - Failed to release queue.", result);
 
            pDevice->queue = NULL;
        }
        else
            HIDREPORTERROR ("hid_DisposeReleaseQueue - no queue.");
    }
    else
        HIDREPORTERROR ("hid_DisposeReleaseQueue - Invalid device.");
    return result;
}
 
// ==================================
// public functions
 
// ---------------------------------
// queues specific element, performing any device queue set up required
// queue is started and ready to return events on exit from this function
 
unsigned long  HIDQueueElement (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidElement(pDevice,pElement))
    {
        if (NULL == pDevice->interface) // must have interface
        {
            HIDREPORTERROR ("HIDQueueElement - Device does not have interface.");
            return kIOReturnError;
        }
        if (NULL == pDevice->queue) // if no queue create queue
            result = hid_CreateQueue (pDevice);
        if ((kIOReturnSuccess != result) || (NULL == pDevice->queue))
        {
            HIDREPORTERRORNUM ("HIDQueueElement - problem creating queue.", result);
            if (kIOReturnSuccess != result)
                return result;
            else
                return kIOReturnError;
        }
 
        // stop queue
        result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
        if (kIOReturnSuccess != result)
            HIDREPORTERROR ("HIDQueueElement - Failed to stop queue.");
 
        // queue element
        if (!(*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
        {
            result = (*(IOHIDQueueInterface**) pDevice->queue)->addElement (pDevice->queue, pElement->cookie, 0);
            if (kIOReturnSuccess != result)
                HIDREPORTERROR ("HIDQueueElement - Failed to add Element to queue.");
        }
 
        // restart queue
        result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
        if (kIOReturnSuccess != result)
            HIDREPORTERROR ("HIDQueueElement - Failed to start queue.");
    }
    else
    {
        HIDREPORTERROR ("HIDQueueElement - Invalid Device and/or element.");
        return kIOReturnBadArgument;
    }
 
   return result;
}
 
// ---------------------------------
// adds all elements to queue, performing any device queue set up required
// queue is started and ready to return events on exit from this function
 
unsigned long  HIDQueueDevice (pRecDevice pDevice)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
    pRecElement pElement;
 
    if (HIDIsValidDevice(pDevice))
    {
        // error checking
        if (NULL == pDevice)
        {
            HIDREPORTERROR ("HIDQueueDevice - Device does not exist.");
            return kIOReturnBadArgument;
        }
        if (NULL == pDevice->interface) // must have interface
        {
            HIDREPORTERROR ("HIDQueueDevice - Device does not have interface.");
            return kIOReturnError;
        }
        if (NULL == pDevice->queue) // if no queue create queue
            result = hid_CreateQueue (pDevice);
        if ((kIOReturnSuccess != result) || (NULL == pDevice->queue))
        {
            HIDREPORTERRORNUM ("HIDQueueDevice - problem creating queue.", result);
            if (kIOReturnSuccess != result)
                return result;
            else
                return kIOReturnError;
        }
 
        // stop queue
        result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDQueueDevice - Failed to stop queue.", result);
 
        // queue element
  //¥ pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
        pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeInput | kHIDElementTypeFeature);
 
        while (pElement)
        {
            if (!(*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
            {
                result = (*(IOHIDQueueInterface**) pDevice->queue)->addElement (pDevice->queue, pElement->cookie, 0);
                if (kIOReturnSuccess != result)
                    HIDREPORTERRORNUM ("HIDQueueDevice - Failed to add element to queue.", result);
            }
            //¥ pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
            pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeInput | kHIDElementTypeFeature);
        }
 
        // start queue
        result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDQueueDevice - Failed to start queue.", result);
        
    }
    else
        HIDREPORTERROR ("HIDQueueDevice - Invalid device.");
 
    return result;
}
 
// ---------------------------------
// removes element for queue, if last element in queue will release queue and closes device interface
 
unsigned long  HIDDequeueElement (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidElement(pDevice,pElement))
    {
        if (!pDevice || !pElement)
            result = kIOReturnBadArgument;
        else
        {
            if ((pDevice->interface) && (pDevice->queue))
            {
                // stop queue
                result = (*(IOHIDQueueInterface**) pDevice->queue)->stop (pDevice->queue);
                if (kIOReturnSuccess != result)
                    HIDREPORTERRORNUM ("HIDDequeueElement - Failed to stop queue.", result);
 
                if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie)) // if has element then remove
                {
                    result = (*(IOHIDQueueInterface**) pDevice->queue)->removeElement (pDevice->queue, pElement->cookie);
                    if (kIOReturnSuccess != result)
                        HIDREPORTERRORNUM ("HIDDequeueElement - Failed to add element to queue", result);
                }
 
                if (hid_IsDeviceQueueEmpty (pDevice)) // release device queue and close interface if queue empty
                {
                    result = hid_DisposeReleaseQueue (pDevice);
                    if (kIOReturnSuccess != result)
                        HIDREPORTERRORNUM ("HIDDequeueElement - Failed to dispose and release queue.", result);
                }
                else // not empty so restart queue
                {
                    result = (*(IOHIDQueueInterface**) pDevice->queue)->start (pDevice->queue);
                    if (kIOReturnSuccess != result)
                        HIDREPORTERRORNUM ("HIDDequeueElement - Failed to start queue.", result);
                }
            }
            else
            {
                HIDREPORTERROR ("HIDDequeueElement - No device inteface or queue.");
                return kIOReturnError;
            }
        }
    }
    else
        HIDREPORTERROR ("HIDDequeueElement - Invalid device.");
 
    return result;
}
 
// ---------------------------------
// completely removes all elements from queue and releases queue and closes device interface
// does not release device interfaces, application must call HIDReleaseDeviceList on exit
 
unsigned long  HIDDequeueDevice (pRecDevice pDevice)
{
    IOReturn result = kIOReturnSuccess;
 
    if (HIDIsValidDevice(pDevice))
    {
        if ((pDevice->interface) && (pDevice->queue))
        {
            // iterate through elements and if queued, remove
            pRecElement pElement = HIDGetFirstDeviceElement (pDevice, kHIDElementTypeIO);
            while (pElement)
            {
                if ((*(IOHIDQueueInterface**) pDevice->queue)->hasElement (pDevice->queue, pElement->cookie))
                {
                    result = (*(IOHIDQueueInterface**) pDevice->queue)->removeElement (pDevice->queue, pElement->cookie);
                    if (kIOReturnSuccess != result)
                        HIDREPORTERRORNUM ("HIDDequeueDevice - Failed to remove element from queue.", result);
                }
                pElement = HIDGetNextDeviceElement (pElement, kHIDElementTypeIO);
            }
        }
        // ensure queue is disposed and released
        // interface will be closed and released on call to HIDReleaseDeviceList
        result = hid_DisposeReleaseQueue (pDevice);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("removeElement - Failed to dispose and release queue.", result);
#if USE_ASYNC_EVENTS
        else if (NULL != pDevice->queueRunLoopSource)
        {
            if (CFRunLoopContainsSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode))
                CFRunLoopRemoveSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode);
            CFRelease(pDevice->queueRunLoopSource);
            pDevice->queueRunLoopSource = NULL;
        }
#endif USE_ASYNC_EVENTS
    }
    else
    {
        HIDREPORTERROR ("HIDDequeueDevice - Invalid device.");
        result = kIOReturnBadArgument;
    }
    return result;
}
 
// ---------------------------------
// releases all device queues for quit or rebuild (must be called)
// does not release device interfaces, application must call HIDReleaseDeviceList on exit
 
unsigned long HIDReleaseAllDeviceQueues (void)
{
    IOReturn result = kIOReturnBadArgument;
    pRecDevice pDevice = HIDGetFirstDevice ();
 
    while (pDevice)
    {
        result = HIDDequeueDevice (pDevice);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDReleaseAllDeviceQueues - Could not dequeue device.", result);
        pDevice = HIDGetNextDevice (pDevice);
    }
    return result;
}
 
// ---------------------------------
// Closes and releases interface to device, should be done prior to exting application
// Note: will have no affect if device or interface do not exist
// application will "own" the device if interface is not closed
// (device may have to be plug and re-plugged in different location to get it working again without a restart)
 
unsigned long HIDCloseReleaseInterface (pRecDevice pDevice)
{
    IOReturn result = kIOReturnSuccess;
    
    if (HIDIsValidDevice(pDevice) && (NULL != pDevice->interface))
    {
        // close the interface
        result = (*(IOHIDDeviceInterface**) pDevice->interface)->close (pDevice->interface);
        if (kIOReturnNotOpen == result)
        {
            //  do nothing as device was not opened, thus can't be closed
        }
        else if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to close IOHIDDeviceInterface.", result);
        //release the interface
        result = (*(IOHIDDeviceInterface**) pDevice->interface)->Release (pDevice->interface);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDCloseReleaseInterface - Failed to release interface.", result);
        pDevice->interface = NULL;
    }   
    return result;
}      
 
// ---------------------------------
// Get the next event in the queue for a device
// elements or entire device should be queued prior to calling this with HIDQueueElement or HIDQueueDevice
// returns true if an event is avialable for the element and fills out *pHIDEvent structure, returns false otherwise
// Note: kIOReturnUnderrun returned from getNextEvent indicates an empty queue not an error condition
// Note: application should pass in a pointer to a IOHIDEventStruct cast to a void (for CFM compatibility)
 
unsigned char HIDGetEvent (pRecDevice pDevice, void * pHIDEvent)
{
    IOReturn result = kIOReturnBadArgument;
    AbsoluteTime zeroTime = {0,0};
 
    if (HIDIsValidDevice(pDevice))
    {
        if (pDevice->queue)
        {
            result = (*(IOHIDQueueInterface**) pDevice->queue)->getNextEvent (pDevice->queue, (IOHIDEventStruct *)pHIDEvent, zeroTime, 0);
            if (kIOReturnUnderrun == result)
                return false;  // no events in queue not an error per say
            else if (kIOReturnSuccess != result) // actual error versus just an empty queue
                HIDREPORTERRORNUM ("HIDGetEvent - Could not get HID event via getNextEvent.", result);
            else
                return true;
        }
        else
            HIDREPORTERROR ("HIDGetEvent - queue does not exist.");
    }
    else
        HIDREPORTERROR ("HIDGetEvent - invalid device.");
 
    return false; // did not get event
}
 
// ---------------------------------
// returns current value for element, polling element
// will return 0 on error conditions which should be accounted for by application
 
long HIDGetElementValue (pRecDevice pDevice, pRecElement pElement)
{
    IOReturn result = kIOReturnBadArgument;
    IOHIDEventStruct hidEvent;
 
    hidEvent.value = 0;
    hidEvent.longValueSize = 0;
    hidEvent.longValue = nil;
 
    if (HIDIsValidElement(pDevice, pElement))
    {
        if (NULL != pDevice->interface)
        {
            // ++ NOTE: If the element type is feature then use queryElementValue instead of getElementValue
            if (kIOHIDElementTypeFeature == pElement->type)
            {
                result = (*(IOHIDDeviceInterface**) pDevice->interface)->queryElementValue (pDevice->interface, pElement->cookie, &hidEvent,0,NULL,NULL,NULL);
                if (kIOReturnUnsupported == result) // unless it's unsuported.
                    goto try_getElementValue;
                else if (kIOReturnSuccess != result)
                    HIDREPORTERRORNUM ("HIDGetElementValue - Could not get HID element value via queryElementValue.", result);
            }
            else if (pElement->type <= kIOHIDElementTypeInput_ScanCodes)
            {
try_getElementValue:
                result = (*(IOHIDDeviceInterface**) pDevice->interface)->getElementValue (pDevice->interface, pElement->cookie, &hidEvent);
                if (kIOReturnSuccess != result)
                    HIDREPORTERRORNUM ("HIDGetElementValue - Could not get HID element value via getElementValue.", result);
            }
            // on 10.0.x this returns the incorrect result for negative ranges, so fix it!!!
   // this is not required on Mac OS X 10.1+
            if ((pElement->min < 0) && (hidEvent.value > pElement->max)) // assume range problem
                hidEvent.value = hidEvent.value + pElement->min - pElement->max - 1;
        }
        else
            HIDREPORTERROR ("HIDGetElementValue - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDGetElementValue - invalid device and/or element.");
 
    // record min and max for auto scale and auto ...
    if (hidEvent.value < pElement->calMin)
        pElement->calMin = hidEvent.value; 
    if (hidEvent.value > pElement->calMax)
        pElement->calMax = hidEvent.value; 
 
    // auto user scale
    return hidEvent.value;
}
 
// ---------------------------------
// Set an elements value
// NOTE: This should only be used when a single element of a report needs to be sent.
// If multiple elements are to be send then transactions should be used.
 
long HIDSetElementValue (pRecDevice pDevice, pRecElement pElement,void* pIOHIDEvent)
{
    IOHIDEventStruct* pMyIOHIDEvent = (IOHIDEventStruct*) pIOHIDEvent;
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidElement(pDevice, pElement))
    {
        if (NULL != pDevice->interface)
        {
            result = (*(IOHIDDeviceInterface**) pDevice->interface)->setElementValue (pDevice->interface, pElement->cookie, pMyIOHIDEvent, -1, nil, nil, nil);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("HIDSetElementValue - Could not set HID element value via setElementValue.", result);
        }
        else
            HIDREPORTERROR ("HIDSetElementValue - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDSetElementValue - invalid device and/or element.");
    
    return result;
}
 
// ---------------------------------
// Set a callback to be called when a queue goes from empty to non-empty
long HIDSetQueueCallback (pRecDevice pDevice, IOHIDCallbackFunction callback)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidDevice(pDevice))
    {
#if USE_ASYNC_EVENTS
        // if we don't have a queue runloop sourceÉ
        if (NULL == pDevice->queueRunLoopSource)
        {
            // then create one
            result = (*(IOHIDQueueInterface**) pDevice->queue)->createAsyncEventSource((void *) pDevice->queue,
                (CFRunLoopSourceRef*) &pDevice->queueRunLoopSource);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("HIDSetQueueCallback - Failed to createAsyncEventSource error: ", result);
        }
        // if we have one nowÉ
        if (NULL != pDevice->queueRunLoopSource)
        {
            // and it's not already attached to our runloopÉ
            if (!CFRunLoopContainsSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode))
                // then attach it now.
                CFRunLoopAddSource(CFRunLoopGetCurrent(), pDevice->queueRunLoopSource, kCFRunLoopDefaultMode);
        }
 
        // now install our callback
        result = (*(IOHIDQueueInterface**) pDevice->queue)->setEventCallout(pDevice->queue, callback, pDevice, pDevice);
        if (kIOReturnSuccess != result)
            HIDREPORTERRORNUM ("HIDSetQueueCallback - Could not set HID queue callback via setEventCallout.", result);
#endif USE_ASYNC_EVENTS
    }
    else
        HIDREPORTERROR ("HIDSetQueueCallback - invalid device and/or element.");
    return result;
}
 
#if 1
// ---------------------------------
// Get a report from a device
long HIDGetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, UInt32* reportBufferSize)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidDevice(pDevice))
    {
        if (NULL != pDevice->interface)
        {
            result = (*(IOHIDDeviceInterface**) pDevice->interface)->getReport (pDevice->interface, reportType, reportID, reportBuffer, reportBufferSize, -1, nil, nil, nil);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("HIDGetReport - Could not getReport, error: ", result);
        }
        else
            HIDREPORTERROR ("HIDGetReport - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDGetReport - invalid device.");
 
    return result;
}
 
// ---------------------------------
// Send a report to a device
long HIDSetReport (pRecDevice pDevice,const IOHIDReportType reportType, const UInt32 reportID, void* reportBuffer, const UInt32 reportBufferSize)
{
    IOReturn result = kIOReturnError;   // assume failure (pessimist!)
 
    if (HIDIsValidDevice(pDevice))
    {
        if (NULL != pDevice->interface)
        {
            result = (*(IOHIDDeviceInterface**) pDevice->interface)->setReport (pDevice->interface, reportType, reportID, reportBuffer, reportBufferSize, -1, nil, nil, nil);
            if (kIOReturnSuccess != result)
                HIDREPORTERRORNUM ("HIDGetReport - Could not setReport; error: ", result);
        }
        else
            HIDREPORTERROR ("HIDGetReport - no interface for device.");
    }
    else
        HIDREPORTERROR ("HIDGetReport - invalid device.");
 
    return result;
}
#endif