how to enable long key pressed interrupt for tps65930 keypad on omap3530

Hellen,

You can use the existing driver to enable long key press feature, here are the steps:

1. Enable long key detection in hardware and corresponding interrupt in KPD_Init(), the following is code snippet.

    // Long Key detection initialization
    TWLReadRegs(pDevice->hTWL,TWL_KEYP_CTRL_REG, &regval, sizeof(regval));
    regval |= TWL_KBD_CTRL_LK_EN;
    TWLWriteRegs(pDevice->hTWL, TWL_KEYP_CTRL_REG, &regval, sizeof(regval));

    regval = (UINT8)(pDevice->LongKeyTimeOut & 0xFF);
    TWLWriteRegs(pDevice->hTWL, TWL_LONG_KEY_REG1, &regval, sizeof(regval));

    TWLReadRegs(pDevice->hTWL,TWL_LK_PTV_REG, &regval, sizeof(regval));
    regval &= 0xF0;
    regval |= (pDevice->LongKeyTimeOut >>8) & 0x0F;
    TWLWriteRegs(pDevice->hTWL, TWL_LK_PTV_REG, &regval, sizeof(regval));

    // Create long key interrupt event
    pDevice->hIntrEventLongKey = CreateEvent(NULL, FALSE, FALSE, NULL);
    if (pDevice->hIntrEventLongKey == NULL)
        {
        DEBUGMSG(ZONE_ERROR, (L"ERROR: KPD_Init: "
            L"Failed create Long key interrupt event\r\n"
            ));
        goto cleanUp;
        }

    // Associate event with TWL LK interrupt
    if (!TWLInterruptInitialize(pDevice->hTWL, TWL_INTR_ITLKI, pDevice->hIntrEventLongKey))
        {
        DEBUGMSG (ZONE_ERROR, (L"ERROR: KPD_Init: "
            L"Failed associate long key event with TWL LK interrupt\r\n"
            ));
        goto cleanUp;
        }

    // Enable LK event
    if (!TWLInterruptMask(pDevice->hTWL, TWL_INTR_ITLKI, FALSE))
        {
        DEBUGMSG (ZONE_ERROR, (L"ERROR: KPD_Init: "
            L"Failed associate long key event with TWL LK interrupt\r\n"
            ));
        }

2. Create thread to handle long key press interrupt. There are two ways to do it.

    a. Create a new interrupt thread, and accociate the thread with long key event( Use key press event and its handling as an example). Implement long key event handling such as sending event to application.

    b. use existing key press interrupt handling thread - KPD_IntrThread(). The thread will handle two events, example code as follows:

        HANDLE hArray[2];
        DWORD event;
        BOOL longKey=FALSE;
       
        hArray[0]=pDevice->hIntrEventKeypad;
        hArray[1]=pDevice->hIntrEventLongKey;

        // Wait for events
        //WaitForSingleObject(pDevice->hIntrEventKeypad, timeout);
        event = WaitForMultipleObjects(2, hArray, FALSE, timeout); 
        if (pDevice->intrThreadExit) break;

      if (event == (WAIT_OBJECT_0 + 1))
            {
            RETAILMSG(1, (L"long key detected\r\n"));
                longKey = TRUE;
            /* do your long key press related handling */     
            }

        if(event == WAIT_OBJECT_0)
        {
             // NORMAL key up/down handling
        }

3. in order to detect the long key press properly, pDevice->samplePeriod should be  bigger than pDevice->LongKeyTimeOut ( the time out value for longkey press)

4. Following changes in tps659xx.cpp - ProcessSecondaryInterrupts_Keypad() are needed, so that the Long key event can be properly set when Longkey Interrupt is triggered.

    // read TWL_KEYPAD_ROWS amount of rows...
    ReadRegs(pDevice, TWL_FULL_CODE_7_0, matrix, TWL_KEYPAD_ROWS);
    // loop through and signal relevant events
    clearMask = status;
    interruptCount = pStatusRegister->interruptCount;
    while (interruptCount-- && status != 0)
    {
        if ((status & 0x01) && *rgEvents)
        {
            RETAILMSG(1, (L"INFO: ProcessSecondaryInterrupts "
                L"rgEvent=%x:%x\r\n", rgEvents, *rgEvents));
           
         break;
        }
        status >>= 1;
        ++rgEvents;
    }
   
    WriteKeypadMatrixQueue(matrix, *rgEvents);
    WriteRegs(pDevice, pStatusRegister->statusSubaddress, &clearMask, sizeof(clearMask));

Regards,

Tao