bsptouch.cpp

IMX31开发板触摸屏驱动程序

//------------------------------------------------------------------------------
//
//  Copyright (C) 2004-2005, Motorola Inc. All Rights Reserved
//
//------------------------------------------------------------------------------
//
//  Copyright (C) 2004-2006, Freescale Semiconductor, Inc. All Rights Reserved.
//  THIS SOURCE CODE, AND ITS USE AND DISTRIBUTION, IS SUBJECT TO THE TERMS
//  AND CONDITIONS OF THE APPLICABLE LICENSE AGREEMENT
//
//------------------------------------------------------------------------------
//
//  File:  bsptouch.cpp
//
//  Provides the implementation for BSP-specific touch support.
//
//------------------------------------------------------------------------------
#include <windows.h>
#include <tchddsi.h>
#include "bsp.h"
#include "pmic_ioctl.h"
#include "pmic_lla.h"
#include "pmic_adc.h"

#include "regs.h"
#include "regs_adc.h"

//-----------------------------------------------------------------------------
// External Functions

//-----------------------------------------------------------------------------
// External Variables
extern "C" const int MIN_CAL_COUNT = 20;

//-----------------------------------------------------------------------------
// Defines

// Maximum allowed variance in the X coordinate samples.
#define DELTA_X_COORD_VARIANCE          24

// Maximum allowed variance in the X coordinate samples.
#define DELTA_Y_COORD_VARIANCE          24


#define TOUCHCLKSRC_FREQ            BSP_CLK_CKIL_FREQ       // clock source is CKIL
#define TOUCHCLKSRC_VAL             EPIT_CR_CLKSRC_CKIL
#define TOUCHPRESCALAR_VAL          0x000               // divide by 1
#define TOUCH_EPIT_TICKS_PER_MSEC   ((TOUCHCLKSRC_FREQ/(TOUCHPRESCALAR_VAL+1))/1000)

#define ABS(x)  ((x) >= 0 ? (x) : (-(x)))

//-----------------------------------------------------------------------------
// Types


//-----------------------------------------------------------------------------
// Global Variables
extern "C" UINT32 gTouchTimerIrq = IRQ_EPIT2;

//-----------------------------------------------------------------------------
// Local Variables
static PCSP_EPIT_REG g_pEPIT;

static HANDLE hPMI;
static TCHAR *gEventNamePri = TEXT("EVENT_TS_PRI");
static TCHAR *gEventNameAlt = TEXT("EVENT_TS_ALT");
// Named event for interrupt registration
static TCHAR *gTouchEventName;


//-----------------------------------------------------------------------------
// Local Functions

//-----------------------------------------------------------------------------
//
// Function: PmicTouchDeinit
//
// This function uninitializes the PMIC touch controller.
//
// Parameters:
//      None.
//
// Returns:
//      None.
//
//-----------------------------------------------------------------------------
static void PmicTouchDeinit(void)
{

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

    // Deregister for PMIC pen down interrupts.
    if (PmicInterruptDeregister(PMIC_MC13783_INT_TSI) != PMIC_SUCCESS)
    {
        ERRORMSG(TRUE, (_T("PmicTouchDeinit:  PmicInterruptDeregister failed\r\n")));
    }

    // Disable PMIC touch interrupt
    // Set to inactive mode
    if (PmicADCTouchStandby(false) != PMIC_SUCCESS)
    {
        ERRORMSG(TRUE, (_T("PmicTouchDeinit:  PmicTouchStandby failed\r\n")));
    }

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));
}


//------------------------------------------------------------------------------
//
// Function: PmicTouchInit
//
// This function initializes the PMIC touch controller.
//
// Parameters:
//      None.
//
// Returns:
//      Status.
//
//------------------------------------------------------------------------------
static PMIC_STATUS PmicTouchInit(void)
{
    PMIC_STATUS rc = PMIC_ERROR;

    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // Register for PMIC pen down interrupts.  Event name must match one given
    // to event created in MDD for IST signaling.
    if (PmicInterruptRegister(PMIC_MC13783_INT_TSI, gTouchEventName)
        != PMIC_SUCCESS)
    {
        ERRORMSG(TRUE, (_T("PmicTouchInit:  PmicInterruptRegister failed\r\n")));
        goto cleanUp;
    }

    // Put PMIC touch ADC into standby (required for pen down interrupt)
    if (PmicADCTouchStandby(true) != PMIC_SUCCESS)
    {
        ERRORMSG(TRUE, (_T("PmicTouchInit:  PmicTouchStandby failed\r\n")));
        goto cleanUp;
    }

    // Make sure pen down interrupt are unmasked
    if (PmicInterruptHandlingComplete(PMIC_MC13783_INT_TSI) != PMIC_SUCCESS)
    {
        ERRORMSG(TRUE, (_T("PmicTouchInit:  PmicInterruptHandlingComplete failed\r\n")));
        goto cleanUp;
    }

    rc = PMIC_SUCCESS;

cleanUp:
    if (rc != PMIC_SUCCESS) PmicTouchDeinit();

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

    return rc;
}

//-----------------------------------------------------------------------------
//
// Function: BSPTouchSetSampleRate
//
// This function configures the rate for acquiring touch samples by
// configuring the periodic interval of the EPIT2 timer.
//
// Parameters:
//      dwIntervalMsec
//          [in] Specifies the interval in msec to be used for generating
//          a periodic timer interrupt.  This interval sets the sample
//          rate of the touch driver.
//
// Returns:
//      None
//
//-----------------------------------------------------------------------------
void BSPTouchSetSampleRate(DWORD dwIntervalMsec)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));
    
    // Enable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_ENABLED_ALL);

    // Configure load register with the number of EPIT ticks required
    // to achieve the specified touch timer tick interval
    OUTREG32(&g_pEPIT->LR, dwIntervalMsec*TOUCH_EPIT_TICKS_PER_MSEC);

    // Configure the compare register to generate interrupt when
    // timer reloads from EPITLR
    // OUTREG32(&g_pEPIT->CMPR, dwIntervalMsec*TOUCH_EPIT_TICKS_PER_MSEC);
    
    // Disable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_DISABLED);

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchTimerInit
//
// This function initializes the EPIT2 timer for use as the touch
// periodic timer.
//
// Parameters:
//      dwIntervalMsec
//          [in] Specifies the interval in msec to be used for generating
//          a periodic timer interrupt.  This interval sets the sample
//          rate of the touch driver.
//
// Returns:
//      TRUE if successful, otherwise FALSE.
//
//-----------------------------------------------------------------------------
static BOOL BSPTouchTimerInit(DWORD dwIntervalMsec)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // Enable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_ENABLED_ALL);

    // Disable EPIT and clear all configuration bits
    OUTREG32(&g_pEPIT->CR, 0);

    // Assert software reset for the timer
    OUTREG32(&g_pEPIT->CR, CSP_BITFMASK(EPIT_CR_SWR));

    // Wait for the software reset to complete
    while (INREG32(&g_pEPIT->CR) & CSP_BITFMASK(EPIT_CR_SWR));

    // Clear timer compare interrupt flag (write-1-clear)
    OUTREG32(&g_pEPIT->SR, CSP_BITFMASK(EPIT_SR_OCIF));

    // Enable timer for "set-and-forget" mode where timer is
    // loaded with EPITLR when count down to zero is reached
    OUTREG32(&g_pEPIT->CR,
        CSP_BITFVAL(EPIT_CR_EN, EPIT_CR_EN_DISABLE) |
        CSP_BITFVAL(EPIT_CR_ENMOD, EPIT_CR_ENMOD_LOAD) |
        CSP_BITFVAL(EPIT_CR_OCIEN, EPIT_CR_OCIEN_ENABLE) |
        CSP_BITFVAL(EPIT_CR_RLD, EPIT_CR_RLD_RELOAD) |
        CSP_BITFVAL(EPIT_CR_PRESCALAR, TOUCHPRESCALAR_VAL) |
        CSP_BITFVAL(EPIT_CR_SWR, EPIT_CR_SWR_NORESET) |
        CSP_BITFVAL(EPIT_CR_IOVW, EPIT_CR_IOVW_OVR) |
        CSP_BITFVAL(EPIT_CR_DBGEN, EPIT_CR_DBGEN_ACTIVE) |
        CSP_BITFVAL(EPIT_CR_WAITEN, EPIT_CR_WAITEN_ENABLE) |
        CSP_BITFVAL(EPIT_CR_DOZEN, EPIT_CR_DOZEN_ENABLE) |
        CSP_BITFVAL(EPIT_CR_STOPEN, EPIT_CR_STOPEN_ENABLE) |
        CSP_BITFVAL(EPIT_CR_OM, EPIT_CR_OM_DICONNECT) |
        CSP_BITFVAL(EPIT_CR_CLKSRC, TOUCHCLKSRC_VAL));

    // Configure the sample rate
    BSPTouchSetSampleRate(dwIntervalMsec);

    // Disable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_DISABLED);

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

    return TRUE;
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchTimerClrIntr
//
// This function clears EPIT2 compare interrupt flag( w1c )
// 
// Parameters:
//      None.
//
// Returns:
//      None.
//
//-----------------------------------------------------------------------------
void BSPTouchTimerClrIntr(void)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // Enable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_ENABLED_ALL);
    
    // Clear timer compare interrupt flag (write-1-clear)
    OUTREG32(&g_pEPIT->SR, CSP_BITFMASK(EPIT_SR_OCIF));

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

    return;
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchTimerEnable
//
// This function activates the touch timer for the specified
// periodic timer interrupt.
//
// Parameters:
//      None.
//
// Returns:
//      None.
//
//-----------------------------------------------------------------------------
void BSPTouchTimerEnable(void)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // Enable EPIT2 clocks
    DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
        DDK_CLOCK_GATE_MODE_ENABLED_ALL);
    
    // Clear timer compare interrupt flag (write-1-clear)
    OUTREG32(&g_pEPIT->SR, CSP_BITFMASK(EPIT_SR_OCIF));

    // Enable the timer
    INSREG32(&g_pEPIT->CR, CSP_BITFMASK(EPIT_CR_EN),
        CSP_BITFVAL(EPIT_CR_EN, EPIT_CR_EN_ENABLE));

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

    return;
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchTimerDisable
//
// DESCRIPTION:
//      This function disables the touch timer and clears any pending
//      timer interrupt.
//
// Parameters:
//      None.
//
// Returns:
//      None.
//
//-----------------------------------------------------------------------------
void BSPTouchTimerDisable(void)
{
    DDK_CLOCK_GATE_MODE cgMode;
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // If the touch timer is enabled
    if (DDKClockGetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, &cgMode) && 
        (cgMode != DDK_CLOCK_GATE_MODE_DISABLED))
    {
        // Disable the timer
        CLRREG32(&g_pEPIT->CR, CSP_BITFMASK(EPIT_CR_EN));

        // Clear timer compare interrupt flag (write-1-clear)
        OUTREG32(&g_pEPIT->SR, CSP_BITFMASK(EPIT_SR_OCIF));

        DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));

        // Disable EPIT2 clocks
        DDKClockSetGatingMode(DDK_CLOCK_GATE_INDEX_EPIT2, 
            DDK_CLOCK_GATE_MODE_DISABLED);
    }
    
    return;
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchTimerIrqQuery
//
// DESCRIPTION:
//      This function queries the touch timer interrupt status.
//
// Parameters:
//      None.
//
// Returns:
//      None.
//
//-----------------------------------------------------------------------------
BOOL BSPTouchTimerIrqQuery(void)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

     // Return timer compare interrupt flag
    return INREG32(&g_pEPIT->SR);

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));
}


//-----------------------------------------------------------------------------
//
// Function: BSPTouchDealloc
//
// This function frees the resources allocated by the touch driver.
//
// Parameters:
//      None.
//
// RETURNS:
//      None.
//
//-----------------------------------------------------------------------------
static void BSPTouchDealloc(void)
{
    DEBUGMSG(ZONE_FUNCTION, (TEXT("+%s()\r\n"), __WFUNCTION__));

    // If touch timer was allocated
    if (g_pEPIT != NULL)
    {
        // Free virtual space allocated for peripheral registers
        MmUnmapIoSpace(g_pEPIT, sizeof(CSP_EPIT_REG));
        g_pEPIT = NULL;
    }

    DEBUGMSG(ZONE_FUNCTION, (TEXT("-%s()\r\n"), __WFUNCTION__));
    return;
}


///-----------------------------------------------------------------------------
//
// Function: BSPTouchAlloc
//
// This function allocates the resources needed by the touch driver.
//
// Parameters:
//      None.
//