usbmouselib.c

IXP425的BSP代码

    pIrp->userCallback = usbMouseIrpCallback;
    pIrp->timeout = USB_TIMEOUT_NONE;
    pIrp->transferLen = sizeof (HID_MSE_BOOT_REPORT);

    pIrp->bfrCount = 1;
    pIrp->bfrList [0].pid = USB_PID_IN;
    pIrp->bfrList [0].pBfr = pSioChan->pIrpBfr;
    pIrp->bfrList [0].bfrLen = 
    min (pSioChan->intMaxPacketSize, HID_BOOT_REPORT_MAX_LEN);


    /* Submit IRP */

    if (usbdTransfer (usbdHandle, pSioChan->pipeHandle, pIrp) != OK)
    return FALSE;

    pSioChan->irpInUse = TRUE;


    return TRUE;
    }


/***************************************************************************
*
* usbMouseIrpCallback - Invoked upon IRP completion/cancellation
*
* Examines the cause of the IRP completion.  If completion was successful,
* interprets the USB mouse's boot report and re-submits the IRP.
*
* RETURNS: N/A
*/

LOCAL VOID usbMouseIrpCallback
    (
    pVOID p	    /* completed IRP */
    )

    {
    pUSB_IRP pIrp = (pUSB_IRP) p;
    pUSB_MSE_SIO_CHAN pSioChan = pIrp->userPtr;


    OSS_MUTEX_TAKE (mseMutex, OSS_BLOCK);

    /* Was the IRP successful? */

    if (pIrp->result == OK)
    {
    /* Interpret the mouse report */

    interpMseReport (pSioChan);
    }


    /* Re-submit the IRP unless it was canceled - which would happen only
     * during pipe shutdown (e.g., the disappearance of the device).
     */

    pSioChan->irpInUse = FALSE;

    if (pIrp->result != S_usbHcdLib_IRP_CANCELED)
    initMseIrp (pSioChan);

    OSS_MUTEX_RELEASE (mseMutex);
    }


/***************************************************************************
*
* configureSioChan - configure USB mouse for operation
*
* Selects the configuration/interface specified in the <pSioChan>
* structure.  These values come from the USBD dynamic attach callback,
* which in turn retrieved them from the configuration/interface
* descriptors which reported the device to be a mouse.
*
* RETURNS: TRUE if successful, else FALSE if failed to configure channel
*/

LOCAL BOOL configureSioChan
    (
    pUSB_MSE_SIO_CHAN pSioChan
    )

    {
    pUSB_CONFIG_DESCR pCfgDescr;
    pUSB_INTERFACE_DESCR pIfDescr;
    pUSB_ENDPOINT_DESCR pEpDescr;
    UINT8 * pBfr;
    UINT8 * pScratchBfr;
    UINT16 actLen;
    UINT16 ifNo;


    if ((pBfr = OSS_MALLOC (USB_MAX_DESCR_LEN)) == NULL)
	return FALSE;

    /* Read the configuration descriptor to get the configuration selection
     * value and to determine the device's power requirements.
     */

    if (usbdDescriptorGet (usbdHandle, 
			   pSioChan->nodeId, 
			   USB_RT_STANDARD | USB_RT_DEVICE, 
			   USB_DESCR_CONFIGURATION, 
			   0, 
			   0, 
			   USB_MAX_DESCR_LEN,
			   pBfr, 
			   &actLen) 
			!= OK)
	{
	OSS_FREE (pBfr);
    	return FALSE;
	}

    if ((pCfgDescr = usbDescrParse (pBfr, 
				    actLen, 
				    USB_DESCR_CONFIGURATION)) 
    				== NULL)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Look for the interface indicated in the pSioChan structure. */

    ifNo = 0;

    /* 
     * usbDescrParseSkip() modifies the value of the pointer it recieves
     * so we pass it a copy of our buffer pointer
     */

    pScratchBfr = pBfr;

    while ((pIfDescr = usbDescrParseSkip (&pScratchBfr, 
					  &actLen, 
					  USB_DESCR_INTERFACE)) 
    				!= NULL)
    	{
    	if (ifNo == pSioChan->interface)
	    break;
    	ifNo++;
    	}

    if (pIfDescr == NULL)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Retrieve the endpoint descriptor following the identified interface
     * descriptor.
     */

    if ((pEpDescr = usbDescrParseSkip (&pScratchBfr, 
				       &actLen, 
				       USB_DESCR_ENDPOINT))
    				== NULL)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Select the configuration. */

    if (usbdConfigurationSet (usbdHandle, 
			      pSioChan->nodeId, 
			      pCfgDescr->configurationValue, 
			      pCfgDescr->maxPower * USB_POWER_MA_PER_UNIT) 
			   != OK)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Select interface 
     * 
     * NOTE: Some devices may reject this command, and this does not represent
     * a fatal error.  Therefore, we ignore the return status.
     */

    usbdInterfaceSet (usbdHandle, 
		      pSioChan->nodeId, 
		      pSioChan->interface, 
		      pIfDescr->alternateSetting);


    /* Select the mouse boot protocol. */

    if (usbHidProtocolSet (usbdHandle, 
			   pSioChan->nodeId, 
			   pSioChan->interface, 
			   USB_HID_PROTOCOL_BOOT) 
			!= OK)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Set the mouse idle time to infinite. */

    if (usbHidIdleSet (usbdHandle, 
		       pSioChan->nodeId, 
		       pSioChan->interface, 
		       0 /* no report ID */, 
		       0 /* infinite */) 
		    != OK)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Create a pipe to monitor input reports from the mouse. */

    pSioChan->intMaxPacketSize = *((pUINT8) &pEpDescr->maxPacketSize) |
    			(*(((pUINT8) &pEpDescr->maxPacketSize) + 1) << 8);

    if (usbdPipeCreate (usbdHandle, 
			pSioChan->nodeId, 
			pEpDescr->endpointAddress, 
			pCfgDescr->configurationValue, 
			pSioChan->interface, 
			USB_XFRTYPE_INTERRUPT, 
			USB_DIR_IN, 
			pSioChan->intMaxPacketSize, 
			sizeof (HID_MSE_BOOT_REPORT), 
			pEpDescr->interval, 
			&pSioChan->pipeHandle) 
		    != OK)
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    /* Initiate IRP to listen for input on interrupt pipe */

    if (!initMseIrp (pSioChan))
        {
        OSS_FREE (pBfr);
        return FALSE;
        }



    OSS_FREE (pBfr);

    return TRUE;

    }


/***************************************************************************
*
* destroyAttachRequest - disposes of an ATTACH_REQUEST structure
*
* RETURNS: N/A
*/

LOCAL VOID destroyAttachRequest
    (
    pATTACH_REQUEST pRequest
    )

    {
    /* Unlink request */

    usbListUnlink (&pRequest->reqLink);

    /* Dispose of structure */

    OSS_FREE (pRequest);
    }


/***************************************************************************
*
* destroySioChan - disposes of a USB_MSE_SIO_CHAN structure
*
* Unlinks the indicated USB_MSE_SIO_CHAN structure and de-allocates
* resources associated with the channel.
*
* RETURNS: N/A
*/

LOCAL VOID destroySioChan
    (
    pUSB_MSE_SIO_CHAN pSioChan
    )

    {
    /* Unlink the structure. */

    usbListUnlink (&pSioChan->sioLink);


    /* Release pipe if one has been allocated.	Wait for the IRP to be
     * cancelled if necessary.
     */

    if (pSioChan->pipeHandle != NULL)
    usbdPipeDestroy (usbdHandle, pSioChan->pipeHandle);

    while (pSioChan->irpInUse)
    OSS_THREAD_SLEEP (1);


    /* Release structure. */

    if (pSioChan->pIrpBfr != NULL)
    OSS_FREE (pSioChan->pIrpBfr);

    OSS_FREE (pSioChan);
    }


/***************************************************************************
*
* createSioChan - creates a new USB_MSE_SIO_CHAN structure
*
* Creates a new USB_MSE_SIO_CHAN structure for the indicated <nodeId>.
* If successful, the new structure is linked into the sioList upon 
* return.
*
* <configuration> and <interface> identify the configuration/interface
* that first reported itself as a mouse for this device.
*
* RETURNS: pointer to newly created structure, or NULL if failure
*/

LOCAL pUSB_MSE_SIO_CHAN createSioChan
    (
    USBD_NODE_ID nodeId,
    UINT16 configuration,
    UINT16 interface
    )

    {
    pUSB_MSE_SIO_CHAN pSioChan;


    /* Try to allocate space for a new mouse struct */

    if ((pSioChan = OSS_CALLOC (sizeof (*pSioChan))) == NULL)
    return NULL;

    if ((pSioChan->pIrpBfr = OSS_MALLOC (HID_BOOT_REPORT_MAX_LEN)) == NULL)
    	{
    	OSS_FREE (pSioChan);
    	return NULL;
        }

    pSioChan->sioChan.pDrvFuncs = &usbMouseSioDrvFuncs;
    pSioChan->nodeId = nodeId;
    pSioChan->connected = TRUE;
    pSioChan->mode = SIO_MODE_INT;

    pSioChan->configuration = configuration;
    pSioChan->interface = interface;


    pSioChan->pReport = (pHID_MSE_BOOT_REPORT) pSioChan->pIrpBfr;

    /* Try to configure the mouse. */

    if (!configureSioChan (pSioChan))
    {
    destroySioChan (pSioChan);
    return NULL;
    }


    /* Link the newly created structure. */

    usbListLink (&sioList, pSioChan, &pSioChan->sioLink, LINK_TAIL);

    return pSioChan;
    }


/***************************************************************************
*
* findSioChan - Searches for a USB_MSE_SIO_CHAN for indicated node ID
*
* RETURNS: pointer to matching USB_MSE_SIO_CHAN or NULL if not found
*/

LOCAL pUSB_MSE_SIO_CHAN findSioChan
    (
    USBD_NODE_ID nodeId
    )

    {
    pUSB_MSE_SIO_CHAN pSioChan = usbListFirst (&sioList);

    while (pSioChan != NULL)
    {
    if (pSioChan->nodeId == nodeId)
	break;

    pSioChan = usbListNext (&pSioChan->sioLink);
    }

    return pSioChan;
    }


/***************************************************************************
*
* notifyAttach - Notifies registered callers of attachment/removal
*
* RETURNS: N/A
*/

LOCAL VOID notifyAttach
    (
    pUSB_MSE_SIO_CHAN pSioChan,
    UINT16 attachCode
    )

    {
    pATTACH_REQUEST pRequest = usbListFirst (&reqList);

    while (pRequest != NULL)
    {
    (*pRequest->callback) (pRequest->callbackArg, 
	(SIO_CHAN *) pSioChan, attachCode);

    pRequest = usbListNext (&pRequest->reqLink);
    }
    }


/***************************************************************************
*
* usbMouseAttachCallback - called by USBD when mouse attached/removed
*
* The USBD will invoke this callback when a USB mouse is attached to or
* removed from the system.  <nodeId> is the USBD_NODE_ID of the node being