--- /dev/null
+Index: linux-2.6.30.9/drivers/input/touchscreen/Kconfig
+===================================================================
+--- linux-2.6.30.9.orig/drivers/input/touchscreen/Kconfig 2009-11-24 21:00:18.000000000 +0100
++++ linux-2.6.30.9/drivers/input/touchscreen/Kconfig 2009-11-24 21:00:45.000000000 +0100
+@@ -161,6 +161,10 @@
+ module will be called wacom_w8001.
+
+
++config TOUCHSCREEN_EP93XX
++ tristate "EP93xx Touchscreen"
++ depends on ARM && INPUT && ARCH_EP93XX
++
+ config TOUCHSCREEN_MTOUCH
+ tristate "MicroTouch serial touchscreens"
+ select SERIO
+Index: linux-2.6.30.9/drivers/input/touchscreen/Makefile
+===================================================================
+--- linux-2.6.30.9.orig/drivers/input/touchscreen/Makefile 2009-11-24 21:00:18.000000000 +0100
++++ linux-2.6.30.9/drivers/input/touchscreen/Makefile 2009-11-24 21:00:45.000000000 +0100
+@@ -14,6 +14,7 @@
+ obj-$(CONFIG_TOUCHSCREEN_CORGI) += corgi_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
+ obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
++obj-$(CONFIG_TOUCHSCREEN_EP93XX) += ep93xx_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
+ obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
+Index: linux-2.6.30.9/drivers/input/touchscreen/ep93xx_ts.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.9/drivers/input/touchscreen/ep93xx_ts.c 2009-11-24 21:09:48.000000000 +0100
+@@ -0,0 +1,1117 @@
++/*
++ * linux/drivers/input/touchscreen/ep93xx_ts.c
++ *
++ * Copyright (C) 2003-2004 Cirrus Corp.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/delay.h>
++#include <linux/wait.h>
++#include <linux/fs.h>
++#include <linux/sched.h>
++#include <linux/poll.h>
++#include <linux/miscdevice.h>
++#include <linux/init.h>
++#include <linux/compiler.h>
++#include <linux/timer.h>
++#include <linux/interrupt.h>
++#include <linux/syscalls.h>
++#include <linux/input.h>
++#include <asm/irq.h>
++#include <mach/hardware.h>
++#include <asm/io.h>
++
++#define TOUCH_OFFSET 0x100000
++#define TOUCH_BASE (EP93XX_APB_VIRT_BASE|TOUCH_OFFSET)
++#define TSSetup (TOUCH_BASE+0x00) /* R/W touchscreen controller setup control register. */
++#define TSXYMaxMin (TOUCH_BASE+0x04) /* R/W touchscreen controller max/min register. */
++#define TSXYResult (TOUCH_BASE+0x08) /* R touchscreen controller result register. */
++#define TSDischarge (TOUCH_BASE+0x0C) /* LOCKED R/W touchscreen Switch Matrix control register. */
++#define TSXSample (TOUCH_BASE+0x10) /* LOCKED R/W touchscreen Switch Matrix control register. */
++#define TSYSample (TOUCH_BASE+0x14) /* LOCKED R/W touchscreen Switch Matrix control register. */
++#define TSDirect (TOUCH_BASE+0x18) /* LOCKED R/W touchscreen Switch Matrix control register. */
++#define TSDetect (TOUCH_BASE+0x1C) /* LOCKED R/W touchscreen Switch Matrix control register. */
++#define TSSWLock (TOUCH_BASE+0x20) /* NA R/W touchscreen software lock register. */
++#define TSSetup2 (TOUCH_BASE+0x24) /* R/W touchscreen setup control register #2. */
++
++//
++// To customize for a new touchscreen, there are various macros that
++// have to be set. If you allow UART_HACK_DEBUG to be defined, you
++// will get real time ts data scrolling up your serial terminal
++// screen that will help you empirically determine good values for these.
++//
++
++//
++// These are used as trigger levels to know when we have pen up/down
++//
++// The rules:
++// 1. TS_HEAVY_INV_PRESSURE < TS_LIGHT_INV_PRESSURE because these
++// are Inverse pressure.
++// 2. Any touch lighter than TS_LIGHT_INV_PRESSURE is a pen up.
++// 3. Any touch heavier than TS_HEAVY_INV_PRESSURE is a pen down.
++//
++#define TS_HEAVY_INV_PRESSURE 0xFE0 //C00
++#define TS_LIGHT_INV_PRESSURE 0xFFF //e00
++
++//
++// If the x, y, or inverse pressure changes more than these values
++// between two succeeding points, the point is not reported.
++//
++#define TS_MAX_VALID_XY_CHANGE 0x300
++#define TS_MAX_VALID_PRESSURE_CHANGE 0x100
++
++//
++// This is the minimum Z1 Value that is valid.
++//
++#define MIN_Z1_VALUE 0x50
++
++//
++// Settling delay for taking each ADC measurement. Increase this
++// if ts is jittery.
++//
++#define EP93XX_TS_ADC_DELAY_USEC 2000
++
++//
++// Delay between TS points.
++//
++#define EP93XX_TS_PER_POINT_DELAY_USEC 10000
++
++//-----------------------------------------------------------------------------
++// Debug messaging thru the UARTs
++//-----------------------------------------------------------------------------
++/*
++ * Hello there! Are you trying to get this driver to work with a new
++ * touschscreen? Turn this on and you will get useful info coming
++ * out of your serial port.
++ */
++/* #define PRINT_CALIBRATION_FACTORS */
++#ifdef PRINT_CALIBRATION_FACTORS
++#define UART_HACK_DEBUG 1
++int iMaxX=0, iMaxY=0, iMinX = 0xfff, iMinY = 0xfff;
++#endif
++
++/*
++ * For debugging, let's spew messages out serial port 1 or 3 at 57,600 baud.
++ */
++/* #define UART_HACK_DEBUG 1 */
++#if 0
++#ifdef UART_HACK_DEBUG
++static char szBuf[256];
++void UARTWriteString(char * msg);
++#define DPRINTK( x... ) \
++ sprintf( szBuf, ##x ); \
++ UARTWriteString( szBuf );
++#else
++static char szBuf[256];
++#define DPRINTK( x... ) \
++ sprintf( szBuf, ##x ); \
++ printk( szBuf );
++#endif
++#endif // 0
++#define DPRINTK( x... )
++
++//-----------------------------------------------------------------------------
++// A few more macros...
++//-----------------------------------------------------------------------------
++#define TSSETUP_DEFAULT ( TSSETUP_NSMP_32 | TSSETUP_DEV_64 | \
++ ((128<<TSSETUP_SDLY_SHIFT) & TSSETUP_SDLY_MASK) | \
++ ((128<<TSSETUP_DLY_SHIFT) & TSSETUP_DLY_MASK) )
++
++#define TSSETUP2_DEFAULT (TSSETUP2_NSIGND)
++
++//
++// For now, we use one of the minor numbers from the local/experimental
++// range.
++//
++#define EP93XX_TS_MINOR 240
++
++//-----------------------------------------------------------------------------
++// Static Declarations
++//-----------------------------------------------------------------------------
++static unsigned int guiLastX, guiLastY;
++static unsigned int guiLastInvPressure;
++
++struct TouchScreenSample
++{
++ int currentX;
++ int currentY;
++ int currentButton;
++ int currentPressure;
++ struct timeval currentTime;
++};
++
++//
++// This must match the structure in tslib.
++//
++struct ts_sample {
++ int x;
++ int y;
++ unsigned int pressure;
++ struct timeval tv;
++};
++
++
++static struct TouchScreenSample gSample;
++
++// static int currentX, currentY, currentButton;
++// static int gPressure;
++// static struct timeval gtime;
++
++static int bFreshTouchData;
++static int bCurrentPenDown;
++
++
++
++static DECLARE_WAIT_QUEUE_HEAD(queue);
++static DECLARE_MUTEX(open_sem);
++static spinlock_t event_buffer_lock = SPIN_LOCK_UNLOCKED;
++static struct fasync_struct *ep93xx_fasync;
++
++//-----------------------------------------------------------------------------
++// Typedef Declarations
++//-----------------------------------------------------------------------------
++typedef enum {
++ TS_MODE_UN_INITIALIZED,
++ TS_MODE_HARDWARE_SCAN,
++ TS_MODE_SOFT_SCAN
++} ts_mode_t;
++
++static ts_mode_t gScanningMode;
++
++typedef enum{
++ TS_STATE_STOPPED = 0,
++ TS_STATE_Z1,
++ TS_STATE_Z2,
++ TS_STATE_Y,
++ TS_STATE_X,
++ TS_STATE_DONE
++} ts_states_t;
++
++typedef struct
++{
++ unsigned int uiX;
++ unsigned int uiY;
++ unsigned int uiZ1;
++ unsigned int uiZ2;
++ ts_states_t state;
++} ts_struct_t;
++
++static ts_struct_t sTouch;
++
++/*
++ * From the spec, here's how to set up the touch screen's switch registers.
++ */
++typedef struct
++{
++ unsigned int uiDetect;
++ unsigned int uiDischarge;
++ unsigned int uiXSample;
++ unsigned int uiYSample;
++ unsigned int uiSwitchZ1;
++ unsigned int uiSwitchZ2;
++}SwitchStructType;
++
++//
++// Here's the switch settings for a 4-wire touchscreen. See the spec
++// for how to handle a 4, 7, or 8-wire.
++//
++const static SwitchStructType sSwitchSettings =
++/* s28en=0
++ * TSDetect TSDischarge TSXSample TSYSample SwitchZ1 SwitchZ2
++ */
++ {0x00403604, 0x0007fe04, 0x00081604, 0x00104601, 0x00101601, 0x00101608};
++
++
++//-----------------------------------------------------------------------------
++// Function Declarations
++//-----------------------------------------------------------------------------
++static void ep93xx_ts_set_direct( unsigned int uiADCSwitch );
++static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id);
++static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id);
++static void ee93xx_ts_evt_add( int button, int dX, int dY, int Pressure );
++static ssize_t ep93xx_ts_read(struct file *filp, char *buf,
++ size_t count, loff_t *l);
++static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait);
++static int ep93xx_ts_open(struct inode *inode, struct file *filp);
++static int ep93xx_ts_fasync(int fd, struct file *filp, int on);
++static int ep93xx_ts_release(struct inode *inode, struct file *filp);
++static ssize_t ep93xx_ts_write(struct file *file, const char *buffer,
++ size_t count, loff_t *ppos);
++static void ep93xx_ts_setup(void);
++static void ep93xx_ts_shutdown(void);
++int __init ep93xx_ts_init(void);
++void __exit ep93xx_ts_exit(void);
++static unsigned int CalculateInvPressure( void );
++static unsigned int ADCGetData( unsigned int uiSamples, unsigned int uiMaxDiff);
++static void TS_Soft_Scan_Mode(void);
++static void TS_Hardware_Scan_Mode(void);
++static void ProcessPointData(void);
++static void Set_Timer2_uSec( unsigned int Delay_mSec );
++static void Stop_Timer2(void);
++
++
++
++//-----------------------------------------------------------------------------
++// Debug stuff...
++//-----------------------------------------------------------------------------
++
++#ifdef UART_HACK_DEBUG
++
++// This "array" is a cheap-n-easy way of getting access to the UART registers.
++static unsigned int * const pDebugUART=(unsigned int *)IO_ADDRESS(UART1_BASE);
++//static unsigned int * const pDebugUART=(unsigned int *)IO_ADDRESS(UART3_BASE);
++static int bUartInitialized = 0;
++
++void SendChar(char value)
++{
++ // wait for Tx fifo full flag to clear.
++ while (pDebugUART[0x18>>2] & 0x20);
++
++ // send a char to the uart
++ pDebugUART[0] = value;
++}
++
++void UARTWriteString(char * msg)
++{
++ int index = 0;
++ unsigned int uiTemp;
++
++ //if((pDebugUART[0x14>>2] & 0x1) == 0)
++ if( bUartInitialized == 0 )
++ {
++ uiTemp = inl(EP93XX_SYSCON_DEVICE_CONFIG);
++ uiTemp |= EP93XX_SYSCON_DEVCFG_U1E;
++ //uiTemp |= EP93XX_SYSCON_DEVCFG_U3E;
++ SysconSetLocked(EP93XX_SYSCON_DEVICE_CONFIG, uiTemp);
++ pDebugUART[0x10>>2] = 0xf;
++ pDebugUART[0xc>>2] = 0;
++ pDebugUART[0x8>>2] = 0x70;
++ pDebugUART[0x14>>2] = 0x1;
++ bUartInitialized = 1;
++ }
++ while (msg[index] != 0)
++ {
++ if (msg[index] == '\n')
++ {
++ SendChar('\r');
++ SendChar('\n');
++ }
++ else
++ {
++ SendChar(msg[index]);
++ }
++ index++;
++ }
++}
++#endif // UART_HACK_DEBUG
++
++/*
++ * ep93xx_ts_isr
++ */
++static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
++{
++ DPRINTK("isr\n");
++
++ //
++ // Note that we don't clear the interrupt here. The interrupt
++ // gets cleared in TS_Soft_Scan_Mode when the TS ENABLE
++ // bit is cleared.
++ //
++
++ //
++ // Set the ts to manual polling mode and schedule a callback.
++ // That way we can return from the isr in a reasonable amount of
++ // time and process the touch in the callback after a brief delay.
++ //
++ TS_Soft_Scan_Mode();
++
++ return(IRQ_HANDLED);
++}
++
++/*
++ * Save the current ts 'event' in an atomic fashion.
++ */
++static void ee93xx_ts_evt_add( int buttons, int iX, int iY, int iPressure )
++{
++#ifdef PRINT_CALIBRATION_FACTORS
++ if( iX > iMaxX ) iMaxX = iX;
++ if( iX < iMinX ) iMinX = iX;
++ if( iY > iMaxY ) iMaxY = iY;
++ if( iY < iMinY ) iMinY = iY;
++#endif
++
++
++ // printk("ee93xx_ts_evt_add\n");
++ //DPRINTK("cb\n");
++ /*
++ * Note the event, but use spinlocks to keep it from getting
++ * halfway read if we get interrupted.
++ */
++
++ spin_lock(&event_buffer_lock);
++ gSample.currentX = iX;
++ gSample.currentY = iY;
++ gSample.currentButton = buttons;
++ gSample.currentPressure = iPressure;
++ bFreshTouchData = 1;
++ do_gettimeofday(&gSample.currentTime);
++
++
++ spin_unlock(&event_buffer_lock);
++
++ kill_fasync(&ep93xx_fasync, SIGIO, POLL_IN);
++ wake_up_interruptible(&queue);
++
++}
++
++
++static ssize_t ep93xx_ts_read(struct file *filp, char *buf, size_t count, loff_t *l)
++{
++
++ unsigned short data[3];
++ struct ts_sample ts_data;
++ int iReturn = -EFAULT;
++ // printk("ep93xx_ts_read\n");
++
++#ifdef PRINT_CALIBRATION_FACTORS
++ static int lala=0;
++ if( bFreshTouchData && (lala++ > 9) )
++ {
++ DPRINTK("%4d, %4d - range [%4d to %4d],[%4d to %4d]\n",
++ f, currentY, iMinX, iMaxX, iMinY, iMaxY );
++ lala = 0;
++ }
++#endif
++ if( !bFreshTouchData)
++ {
++ iReturn = 0;
++ }
++ else if( (count == sizeof(data)) )
++ {
++ spin_lock_irq(&event_buffer_lock);
++ bFreshTouchData = 0;
++ data[0] = gSample.currentX;
++ data[1] = gSample.currentY;
++ data[2] = gSample.currentButton;
++
++ spin_unlock_irq(&event_buffer_lock);
++
++ if (copy_to_user(buf, data, sizeof data))
++ return -EFAULT;
++
++ count -= sizeof(data);
++
++ /* return the # of bytes that got read */
++ iReturn = sizeof(data) ;
++ }
++ else if (count == sizeof(struct ts_sample) )
++ {
++ spin_lock_irq(&event_buffer_lock);
++ bFreshTouchData = 0;
++ ts_data.x = gSample.currentX;
++ ts_data.y = gSample.currentY;
++ ts_data.pressure = gSample.currentPressure;
++ ts_data.tv = gSample.currentTime;
++ spin_unlock_irq(&event_buffer_lock);
++
++ if (copy_to_user(buf, &ts_data, sizeof(struct ts_sample)))
++ {
++ iReturn = -EFAULT;
++ }
++ else
++ {
++ count -= sizeof(ts_data);
++ iReturn = sizeof(ts_data);
++ }
++
++ }
++
++ return iReturn;
++}
++
++static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait)
++{
++ // printk("ep93xx_ts_poll\n");
++ poll_wait(filp, &queue, wait);
++
++ if( bFreshTouchData )
++ {
++ return POLLIN | POLLRDNORM;
++ }
++
++ return 0;
++}
++
++static int ep93xx_ts_open(struct inode *inode, struct file *filp)
++{
++ printk("ep93xx_ts_open");
++
++ if( down_trylock(&open_sem) )
++ {
++ return -EBUSY;
++ }
++
++ ep93xx_ts_setup();
++
++ return 0;
++}
++
++/*
++ * Asynchronous I/O support.
++ */
++static int ep93xx_ts_fasync(int fd, struct file *filp, int on)
++{
++ int retval;
++
++ retval = fasync_helper(fd, filp, on, &ep93xx_fasync);
++ if (retval < 0)
++ {
++ return retval;
++ }
++
++ return 0;
++}
++
++static int ep93xx_ts_release(struct inode *inode, struct file *filp)
++{
++ Stop_Timer2();
++
++ /*
++ * Call our async I/O support to request that this file
++ * cease to be used for async I/O.
++ */
++ ep93xx_ts_fasync(-1, filp, 0);
++
++ ep93xx_ts_shutdown();
++
++ up(&open_sem);
++
++ return 0;
++}
++
++static ssize_t ep93xx_ts_write(struct file *file, const char *buffer, size_t count,
++ loff_t *ppos)
++{
++ return -EINVAL;
++}
++
++
++static int ep93xx_ts_ioctl(struct inode *inode, struct file *file, uint command, ulong u)
++{
++ static const int version = EV_VERSION;
++ static const u_int32_t bit =(1 << EV_ABS);
++ static const u_int32_t absbit = (1 << ABS_X) | (1 << ABS_Y) | (1 << ABS_PRESSURE);
++ int iReturn ;
++ int i = 0;
++
++ switch(command)
++ {
++ case EVIOCGVERSION:
++ DPRINTK("ep93xx_ts_ioctl command = EVIOCGVERSION\r\n");
++ i = copy_to_user((void __user *)u, (void *)version, sizeof(version));
++ iReturn = i ? -EFAULT : 0;
++ break;
++
++ case EVIOCGBIT(0,sizeof(u_int32_t) * 8) :
++ DPRINTK("ep93xx_ts_ioctl command = EVIOCGBIT(0,sizeof(uint32) * 8)\r\n");
++ i = copy_to_user((void __user *)u, (void *)bit, sizeof(bit));
++ iReturn = i ? -EFAULT : 0;
++ break;
++
++ case EVIOCGBIT(EV_ABS, sizeof(absbit) * 8):
++ DPRINTK("ep93xx_ts_ioctl command = EVIOCGBIT(0,sizeof(uint32) * 8)\r\n");
++ copy_to_user((void __user *)u, (void *)absbit, sizeof(absbit));
++ iReturn = i ? -EFAULT : 0;
++ break;
++ default:
++ DPRINTK(" ep93xx_ts_ioctl unknown command = %d\n",u);
++ iReturn = -1;
++ break;
++ }
++
++ return iReturn;
++}
++
++static struct file_operations ep93xx_ts_fops = {
++ owner: THIS_MODULE,
++ read: ep93xx_ts_read,
++ write: ep93xx_ts_write,
++ poll: ep93xx_ts_poll,
++ open: ep93xx_ts_open,
++ ioctl: ep93xx_ts_ioctl,
++ release: ep93xx_ts_release,
++ fasync: ep93xx_ts_fasync,
++};
++
++static struct miscdevice ep93xx_ts_miscdev =
++{
++ EP93XX_TS_MINOR,
++ "ep93xx_ts",
++ &ep93xx_ts_fops
++};
++
++void ep93xx_ts_setup(void)
++{
++ unsigned int uiKTDIV, uiTSXYMaxMin;
++ // printk("ep93xx_hw_setup\n");
++
++ /*
++ * Set the TSEN bit in KTDIV so that we are enabling the clock
++ * for the touchscreen.
++ */
++ uiKTDIV = inl(SYSCON_KTDIV);
++ uiKTDIV |= SYSCON_KTDIV_TSEN;
++ SysconSetLocked( SYSCON_KTDIV, uiKTDIV );
++
++ //
++ // Program the TSSetup and TSSetup2 registers.
++ //
++ outl( TSSETUP_DEFAULT, TSSetup );
++ outl( TSSETUP2_DEFAULT, TSSetup2 );
++
++ //
++ // Set the the touch settings.
++ //
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiDischarge, TSDirect );
++
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiDischarge, TSDischarge );
++
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiSwitchZ1, TSXSample );
++
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiSwitchZ2, TSYSample );
++
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiDetect, TSDetect );
++
++ //
++ // X,YMin set to 0x40 = have to drag that many pixels for a new irq.
++ // X,YMax set to 0x40 = 1024 pixels is the maximum movement within the
++ // time scan limit.
++ //
++ uiTSXYMaxMin = (50 << TSMAXMIN_XMIN_SHIFT) & TSMAXMIN_XMIN_MASK;
++ uiTSXYMaxMin |= (50 << TSMAXMIN_YMIN_SHIFT) & TSMAXMIN_YMIN_MASK;
++ uiTSXYMaxMin |= (0xff << TSMAXMIN_XMAX_SHIFT) & TSMAXMIN_XMAX_MASK;
++ uiTSXYMaxMin |= (0xff << TSMAXMIN_YMAX_SHIFT) & TSMAXMIN_YMAX_MASK;
++ outl( uiTSXYMaxMin, TSXYMaxMin );
++
++ bCurrentPenDown = 0;
++ bFreshTouchData = 0;
++ guiLastX = 0;
++ guiLastY = 0;
++ guiLastInvPressure = 0xffffff;
++
++ //
++ // Enable the touch screen scanning engine.
++ //
++ TS_Hardware_Scan_Mode();
++}
++
++/*
++ * ep93xx_ts_shutdown
++ *
++ */
++static void
++ep93xx_ts_shutdown(void)
++{
++ unsigned int uiKTDIV;
++
++ DPRINTK("ep93xx_ts_shutdown\n");
++
++ sTouch.state = TS_STATE_STOPPED;
++ Stop_Timer2();
++
++ /*
++ * Disable the scanning engine.
++ */
++ outl( 0, TSSetup );
++ outl( 0, TSSetup2 );
++
++ /*
++ * Clear the TSEN bit in KTDIV so that we are disabling the clock
++ * for the touchscreen.
++ */
++ uiKTDIV = inl(SYSCON_KTDIV);
++ uiKTDIV &= ~SYSCON_KTDIV_TSEN;
++ SysconSetLocked( SYSCON_KTDIV, uiKTDIV );
++
++} /* ep93xx_ts_shutdown */
++
++static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id)
++{
++ DPRINTK("%d", (int)sTouch.state );
++
++ switch( sTouch.state )
++ {
++ case TS_STATE_STOPPED:
++ TS_Hardware_Scan_Mode();
++ break;
++
++ //
++ // Get the Z1 value for pressure measurement and set up
++ // the switch register for getting the Z2 measurement.
++ //
++ case TS_STATE_Z1:
++ Set_Timer2_uSec( EP93XX_TS_ADC_DELAY_USEC );
++ sTouch.uiZ1 = ADCGetData( 2, 200 );
++ ep93xx_ts_set_direct( sSwitchSettings.uiSwitchZ2 );
++ sTouch.state = TS_STATE_Z2;
++ break;
++
++ //
++ // Get the Z2 value for pressure measurement and set up
++ // the switch register for getting the Y measurement.
++ //
++ case TS_STATE_Z2:
++ sTouch.uiZ2 = ADCGetData( 2, 200 );
++ ep93xx_ts_set_direct( sSwitchSettings.uiYSample );
++ sTouch.state = TS_STATE_Y;
++ break;
++
++ //
++ // Get the Y value and set up the switch register for
++ // getting the X measurement.
++ //
++ case TS_STATE_Y:
++ sTouch.uiY = ADCGetData( 4, 20 );
++ ep93xx_ts_set_direct( sSwitchSettings.uiXSample );
++ sTouch.state = TS_STATE_X;
++ break;
++
++ //
++ // Read the X value. This is the last of the 4 adc values
++ // we need so we continue on to process the data.
++ //
++ case TS_STATE_X:
++ Stop_Timer2();
++
++ sTouch.uiX = ADCGetData( 4, 20 );
++
++ outl( 0xaa, TSSWLock );
++ outl( sSwitchSettings.uiDischarge, TSDirect );
++
++ sTouch.state = TS_STATE_DONE;
++
++ /*
++ * Process this set of ADC readings.
++ */
++ ProcessPointData();
++
++ break;
++
++
++ //
++ // Shouldn't get here. But if we do, we can recover...
++ //
++ case TS_STATE_DONE:
++ TS_Hardware_Scan_Mode();
++ break;
++ }
++
++ //
++ // Clear the timer2 interrupt.
++ //
++ outl( 1, TIMER2CLEAR );
++ return(IRQ_HANDLED);
++}
++
++/*---------------------------------------------------------------------
++ * ProcessPointData
++ *
++ * This routine processes the ADC data into usable point data and then
++ * puts the driver into hw or sw scanning mode before returning.
++ *
++ * We calculate inverse pressure (lower number = more pressure) then
++ * do a hystheresis with the two pressure values 'light' and 'heavy'.
++ *
++ * If we are above the light, we have pen up.
++ * If we are below the heavy we have pen down.
++ * As long as the pressure stays below the light, pen stays down.
++ * When we get above the light again, pen goes back up.
++ *
++ */
++static void ProcessPointData(void)
++{
++ int bValidPoint = 0;
++ unsigned int uiXDiff, uiYDiff, uiInvPressureDiff;
++ unsigned int uiInvPressure;
++
++ //
++ // Calculate the current pressure.
++ //
++ uiInvPressure = CalculateInvPressure();
++
++ DPRINTK(" X=0x%x, Y=0x%x, Z1=0x%x, Z2=0x%x, InvPressure=0x%x",
++ sTouch.uiX, sTouch.uiY, sTouch.uiZ1, sTouch.uiZ2, uiInvPressure );
++
++ //
++ // If pen pressure is so light that it is greater than the 'max' setting
++ // then we consider this to be a pen up.
++ //
++ if( uiInvPressure >= TS_LIGHT_INV_PRESSURE )
++ {
++ DPRINTK(" -- up \n");
++ bCurrentPenDown = 0;
++ ee93xx_ts_evt_add( 0, guiLastX, guiLastY, 0 );
++ TS_Hardware_Scan_Mode();
++ return;
++ }
++
++ //
++ // Hystheresis:
++ // If the pen pressure is hard enough to be less than the 'min' OR
++ // the pen is already down and is still less than the 'max'...
++ //
++ if( (uiInvPressure < TS_HEAVY_INV_PRESSURE) ||
++ ( bCurrentPenDown && (uiInvPressure < TS_LIGHT_INV_PRESSURE) ) )
++ {
++ if( bCurrentPenDown )
++ {
++ //
++ // If pen was previously down, check the difference between
++ // the last sample and this one... if the difference between
++ // samples is too great, ignore the sample.
++ //
++ uiXDiff = abs(guiLastX - sTouch.uiX);
++ uiYDiff = abs(guiLastY - sTouch.uiY);
++ uiInvPressureDiff = abs(guiLastInvPressure - uiInvPressure);
++
++ if( (uiXDiff < TS_MAX_VALID_XY_CHANGE) && (uiYDiff < TS_MAX_VALID_XY_CHANGE) &&
++ (uiInvPressureDiff < TS_MAX_VALID_PRESSURE_CHANGE) )
++ {
++ DPRINTK(" -- valid(two) \n");
++ bValidPoint = 1;
++ }
++ else
++ {
++ DPRINTK(" -- INvalid(two) \n");
++ }
++ }
++ else
++ {
++ DPRINTK(" -- valid \n");
++ bValidPoint = 1;
++ }
++
++ /*
++ * If either the pen was put down or dragged make a note of it.
++ */
++ if( bValidPoint )
++ {
++ guiLastX = sTouch.uiX;
++ guiLastY = sTouch.uiY;
++ guiLastInvPressure = uiInvPressure;
++ bCurrentPenDown = 1;
++ ee93xx_ts_evt_add( 1, sTouch.uiX, sTouch.uiY, (0x7000000 /uiInvPressure) );
++ }
++
++ TS_Soft_Scan_Mode();
++ return;
++ }
++
++ DPRINTK(" -- fallout \n");
++ TS_Hardware_Scan_Mode();
++}
++
++static void ep93xx_ts_set_direct( unsigned int uiADCSwitch )
++{
++ unsigned int uiResult;
++
++ //
++ // Set the switch settings in the direct register.
++ //
++ outl( 0xaa, TSSWLock );
++ outl( uiADCSwitch, TSDirect );
++
++ //
++ // Read and throw away the first sample.
++ //
++ do {
++ uiResult = inl(TSXYResult);
++ } while( !(uiResult & TSXYRESULT_SDR) );
++
++}
++
++static unsigned int ADCGetData
++(
++ unsigned int uiSamples,
++ unsigned int uiMaxDiff
++)
++{
++ unsigned int uiResult, uiValue, uiCount, uiLowest, uiHighest, uiSum, uiAve;
++
++ do
++ {
++ //
++ //Initialize our values.
++ //
++ uiLowest = 0xfffffff;
++ uiHighest = 0;
++ uiSum = 0;
++
++ for( uiCount = 0 ; uiCount < uiSamples ; uiCount++ )
++ {
++ //
++ // Read the touch screen four more times and average.
++ //
++ do {
++ uiResult = inl(TSXYResult);
++ } while( !(uiResult & TSXYRESULT_SDR) );
++
++ uiValue = (uiResult & TSXYRESULT_AD_MASK) >> TSXYRESULT_AD_SHIFT;
++ uiValue = ((uiValue >> 4) + ((1 + TSXYRESULT_X_MASK)>>1)) & TSXYRESULT_X_MASK;
++
++ //
++ // Add up the values.
++ //
++ uiSum += uiValue;
++
++ //
++ // Get the lowest and highest values.
++ //
++ if( uiValue < uiLowest )
++ {
++ uiLowest = uiValue;
++ }
++ if( uiValue > uiHighest )
++ {
++ uiHighest = uiValue;
++ }
++ }
++
++ } while( (uiHighest - uiLowest) > uiMaxDiff );
++
++ //
++ // Calculate the Average value.
++ //
++ uiAve = uiSum / uiSamples;
++
++ return uiAve;
++}
++
++//****************************************************************************
++// CalculateInvPressure
++//****************************************************************************
++// Is the Touch Valid. Touch is not valid if the X or Y value is not
++// in range and the pressure is not enough.
++//
++// Touch resistance can be measured by the following formula:
++//
++// Rx * X * Z2
++// Rtouch = --------- * (-- - 1)
++// 4096 Z1
++//
++// This is simplified in the ration of Rtouch to Rx. The lower the value, the
++// higher the pressure.
++//
++// Z2
++// InvPressure = X * (-- - 1)
++// Z1
++//
++static unsigned int CalculateInvPressure(void)
++{
++ unsigned int uiInvPressure;
++
++ //
++ // Check to see if the point is valid.
++ //
++ if( sTouch.uiZ1 < MIN_Z1_VALUE )
++ {
++ uiInvPressure = 0x10000;
++ }
++
++ //
++ // Can omit the pressure calculation if you need to get rid of the division.
++ //
++ else
++ {
++ uiInvPressure = ((sTouch.uiX * sTouch.uiZ2) / sTouch.uiZ1) - sTouch.uiX;
++ }
++
++ return uiInvPressure;
++}
++
++
++
++//****************************************************************************
++// TS_Hardware_Scan_Mode
++//****************************************************************************
++// Enables the ep93xx ts scanning engine so that when the pen goes down
++// we will get an interrupt.
++//
++//
++static void TS_Hardware_Scan_Mode(void)
++{
++ unsigned int uiDevCfg;
++
++ DPRINTK("S\n");
++
++ //
++ // Disable the soft scanning engine.
++ //
++ sTouch.state = TS_STATE_STOPPED;
++ Stop_Timer2();
++
++ //
++ // Clear the TIN (Touchscreen INactive) bit so we can go to
++ // automatic scanning mode.
++ //
++ uiDevCfg = inl( EP93XX_SYSCON_DEVICE_CONFIG );
++ SysconSetLocked( EP93XX_SYSCON_DEVICE_CONFIG, (uiDevCfg & ~EP93XX_SYSCON_DEVCFG_TIN) );
++
++ //
++ // Enable the touch screen scanning state machine by setting
++ // the ENABLE bit.
++ //
++ outl( (TSSETUP_DEFAULT | TSSETUP_ENABLE), TSSetup );
++
++ //
++ // Set the flag to show that we are in interrupt mode.
++ //
++ gScanningMode = TS_MODE_HARDWARE_SCAN;
++
++ //
++ // Initialize TSSetup2 register.
++ //
++ outl( TSSETUP2_DEFAULT, TSSetup2 );
++
++}
++
++//****************************************************************************
++// TS_Soft_Scan_Mode
++//****************************************************************************
++// Sets the touch screen to manual polling mode.
++//
++//
++static void TS_Soft_Scan_Mode(void)
++{
++ unsigned int uiDevCfg;
++
++ DPRINTK("M\n");
++
++ if( gScanningMode != TS_MODE_SOFT_SCAN )
++ {
++ //
++ // Disable the touch screen scanning state machine by clearing
++ // the ENABLE bit.
++ //
++ outl( TSSETUP_DEFAULT, TSSetup );
++
++ //
++ // Set the TIN bit so we can do manual touchscreen polling.
++ //
++ uiDevCfg = inl(EP93XX_SYSCON_DEVICE_CONFIG );
++ SysconSetLocked( EP93XX_SYSCON_DEVICE_CONFIG, (uiDevCfg | EP93XX_SYSCON_DEVCFG_TIN) );
++ }
++
++ //
++ // Set the switch register up for the first ADC reading
++ //
++ ep93xx_ts_set_direct( sSwitchSettings.uiSwitchZ1 );
++
++ //
++ // Initialize our software state machine to know which ADC
++ // reading to take
++ //
++ sTouch.state = TS_STATE_Z1;
++
++ //
++ // Set the timer so after a mSec or two settling delay it will
++ // take the first ADC reading.
++ //
++ Set_Timer2_uSec( EP93XX_TS_PER_POINT_DELAY_USEC );
++
++ //
++ // Note that we are in sw scanning mode not hw scanning mode.
++ //
++ gScanningMode = TS_MODE_SOFT_SCAN;
++
++}
++
++static void Set_Timer2_uSec( unsigned int uiDelay_uSec )
++{
++ unsigned int uiClockTicks;
++
++ /*
++ * Stop timer 2
++ */
++ outl( 0, TIMER2CONTROL );
++
++ uiClockTicks = ((uiDelay_uSec * 508) + 999) / 1000;
++ outl( uiClockTicks, TIMER2LOAD );
++ outl( uiClockTicks, TIMER2VALUE );
++
++ /*
++ * Set up Timer 2 for 508 kHz clock and periodic mode.
++ */
++ outl( 0xC8, TIMER2CONTROL );
++
++}
++
++static void Stop_Timer2(void)
++{
++ outl( 0, TIMER2CONTROL );
++}
++
++/*
++ * Initialization and exit routines
++ */
++int __init ep93xx_ts_init(void)
++{
++ int retval;
++
++ //printk("ep93xx_ts_init\n");
++
++ // printk("request Touchscreen interrupt.\n");
++ retval = request_irq( IRQ_EP93XX_TOUCH, ep93xx_ts_isr, IRQF_DISABLED, "ep93xx_ts", 0);
++ if( retval )
++ {
++ printk(KERN_WARNING "ep93xx_ts: failed to get touchscreen IRQ\n");
++ return retval;
++ }
++
++ // printk("Request Timer interrupt.\n");
++ retval = request_irq( IRQ_EP93XX_TIMER2, ep93xx_timer2_isr,
++ IRQF_DISABLED, "ep93xx_timer2", 0);
++ if( retval )
++ {
++ printk(KERN_WARNING "ep93xx_ts: failed to get timer2 IRQ\n");
++ return retval;
++ }
++
++ // printk("Register Touchscreen Driver\n");
++ misc_register(&ep93xx_ts_miscdev);
++
++ sTouch.state = TS_STATE_STOPPED;
++ gScanningMode = TS_MODE_UN_INITIALIZED;
++
++ printk(KERN_NOTICE "ep93xx touchscreen driver configured for 4-wire operation\n");
++
++ return 0;
++}
++void __exit
++ep93xx_ts_exit(void)
++{
++ DPRINTK("ep93xx_ts_exit\n");
++
++ Stop_Timer2();
++
++ free_irq(IRQ_EP93XX_TOUCH, 0);
++ free_irq(IRQ_EP93XX_TIMER2, 0);
++
++ misc_deregister(&ep93xx_ts_miscdev);
++}
++
++module_init(ep93xx_ts_init);
++module_exit(ep93xx_ts_exit);
++
++MODULE_DESCRIPTION("Cirrus EP93xx touchscreen driver");
++MODULE_SUPPORTED_DEVICE("touchscreen/ep93xx");
+Index: linux-2.6.30.9/drivers/input/touchscreen/ep93xx_ts.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.9/drivers/input/touchscreen/ep93xx_ts.h 2009-11-24 21:00:45.000000000 +0100
+@@ -0,0 +1,53 @@
++/*\r
++ * ep93xx_ts.h\r
++ *\r
++ * The contents of this file are subject to the Mozilla Public License\r
++ * Version 1.1 (the "License"); you may not use this file except in\r
++ * compliance with the License. You may obtain a copy of the License\r
++ * at http://www.mozilla.org/MPL/\r
++ *\r
++ * Software distributed under the License is distributed on an "AS IS"\r
++ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See\r
++ * the License for the specific language governing rights and\r
++ * limitations under the License.\r
++ *\r
++ * The initial developer of the original code is David A. Hinds\r
++ * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds\r
++ * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.\r
++ *\r
++ * Alternatively, the contents of this file may be used under the\r
++ * terms of the GNU General Public License version 2 (the "GPL"), in\r
++ * which case the provisions of the GPL are applicable instead of the\r
++ * above. If you wish to allow the use of your version of this file\r
++ * only under the terms of the GPL and not to allow others to use\r
++ * your version of this file under the MPL, indicate your decision by\r
++ * deleting the provisions above and replace them with the notice and\r
++ * other provisions required by the GPL. If you do not delete the\r
++ * provisions above, a recipient may use your version of this file\r
++ * under either the MPL or the GPL.\r
++ */\r
++\r
++#ifndef _LINUX_EP93XX_TS_H\r
++#define _LINUX_EP93XX_TS_H\r
++\r
++/*touchscreen register defines*/\r
++#define SYSCON_KTDIV EP93XX_SYSCON_KEY_TOUCH_CLOCK_DIV\r
++#define SYSCON_SWLOCK EP93XX_SYSCON_SWLOCK\r
++#define TSSetup EP93XX_TOUCHSCREEN_TSSetup\r
++#define TSXYMaxMin EP93XX_TOUCHSCREEN_TSXYMaxMin\r
++#define TSXYResult EP93XX_TOUCHSCREEN_TSDischarge\r
++#define TSDischarge EP93XX_TOUCHSCREEN_TSDischarge\r
++#define TSXSample EP93XX_TOUCHSCREEN_TSXSample\r
++#define TSYSample EP93XX_TOUCHSCREEN_TSYSample\r
++#define TSDirect EP93XX_TOUCHSCREEN_TSDirect\r
++#define TSDetect EP93XX_TOUCHSCREEN_TSDetect\r
++#define TSSWLock EP93XX_TOUCHSCREEN_TSSWLock\r
++#define TSSetup2 EP93XX_TOUCHSCREEN_TSSetup2\r
++\r
++\r
++//#define SYSCON_DEVCFG EP93XX_SYSCON_DEVICE_CONFIG\r
++#define TIMER2CONTROL EP93XX_TIMER2_CONTROL\r
++#define TIMER2LOAD EP93XX_TIMER2_LOAD\r
++#define TIMER2VALUE EP93XX_TIMER2_VALUE\r
++#define TIMER2CLEAR EP93XX_TIMER2_CLEAR\r
++#endif\r
+Index: linux-2.6.30.9/arch/arm/mach-ep93xx/include/mach/hardware.h
+===================================================================
+--- linux-2.6.30.9.orig/arch/arm/mach-ep93xx/include/mach/hardware.h 2009-11-24 21:00:18.000000000 +0100
++++ linux-2.6.30.9/arch/arm/mach-ep93xx/include/mach/hardware.h 2009-11-24 21:09:21.000000000 +0100
+@@ -7,6 +7,7 @@
+ #include "ep93xx-regs.h"
+
+ #define pcibios_assign_all_busses() 0
++#include "regs_touch.h"
+
+ #include "platform.h"
+
+Index: linux-2.6.30.9/arch/arm/mach-ep93xx/include/mach/regs_touch.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.9/arch/arm/mach-ep93xx/include/mach/regs_touch.h 2009-11-24 21:00:45.000000000 +0100
+@@ -0,0 +1,95 @@
++/*=============================================================================
++ *
++ * FILE: regs_touch.h
++ *
++ * DESCRIPTION: Analog Touchscreen Register Definition
++ *
++ * Copyright Cirrus Logic, 2001-2003
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
++ *=============================================================================
++ */
++#ifndef _REGS_TOUCH_H_
++#define _REGS_TOUCH_H_
++
++/*
++ *-----------------------------------------------------------------------------
++ * Individual bit #defines
++ *-----------------------------------------------------------------------------
++ */
++#define TSSETUP_SDLY_MASK 0x000003FF
++#define TSSETUP_SDLY_SHIFT 0
++#define TSSETUP_NSMP_4 0x00000000
++#define TSSETUP_NSMP_8 0x00000400
++#define TSSETUP_NSMP_16 0x00000800
++#define TSSETUP_NSMP_32 0x00000C00
++#define TSSETUP_NSMP_MASK 0x00000C00
++#define TSSETUP_DEV_4 0x00000000
++#define TSSETUP_DEV_8 0x00001000
++#define TSSETUP_DEV_12 0x00002000
++#define TSSETUP_DEV_16 0x00003000
++#define TSSETUP_DEV_24 0x00004000
++#define TSSETUP_DEV_32 0x00005000
++#define TSSETUP_DEV_64 0x00006000
++#define TSSETUP_DEV_128 0x00007000
++#define TSSETUP_ENABLE 0x00008000
++#define TSSETUP_DLY_MASK 0x03FF0000
++#define TSSETUP_DLY_SHIFT 16
++#define TSSETUP_TDTCT 0x80000000
++
++#define TSMAXMIN_XMIN_MASK 0x000000FF
++#define TSMAXMIN_XMIN_SHIFT 0
++#define TSMAXMIN_YMIN_MASK 0x0000FF00
++#define TSMAXMIN_YMIN_SHIFT 8
++#define TSMAXMIN_XMAX_MASK 0x00FF0000
++#define TSMAXMIN_XMAX_SHIFT 16
++#define TSMAXMIN_YMAX_MASK 0xFF000000
++#define TSMAXMIN_YMAX_SHIFT 24
++
++#define TSXYRESULT_X_MASK 0x00000FFF
++#define TSXYRESULT_X_SHIFT 0
++#define TSXYRESULT_AD_MASK 0x0000FFFF
++#define TSXYRESULT_AD_SHIFT 0
++#define TSXYRESULT_Y_MASK 0x0FFF0000
++#define TSXYRESULT_Y_SHIFT 16
++#define TSXYRESULT_SDR 0x80000000
++
++#define TSX_SAMPLE_MASK 0x00003FFF
++#define TSX_SAMPLE_SHIFT 0x00
++#define TSY_SAMPLE_MASK 0x3FFF0000
++#define TSY_SAMPLE_SHIFT 0x10
++
++#define TSSETUP2_TINT 0x00000001
++#define TSSETUP2_NICOR 0x00000002
++#define TSSETUP2_PINT 0x00000004
++#define TSSETUP2_PENSTS 0x00000008
++#define TSSETUP2_PINTEN 0x00000010
++#define TSSETUP2_DEVINT 0x00000020
++#define TSSETUP2_DINTEN 0x00000040
++#define TSSETUP2_DTMEN 0x00000080
++#define TSSETUP2_DISDEV 0x00000100
++#define TSSETUP2_NSIGND 0x00000200
++#define TSSETUP2_S28EN 0x00000400
++#define TSSETUP2_RINTEN 0x00000800
++
++#define TSXYRESULT_SDR 0x80000000
++
++/*
++ *-----------------------------------------------------------------------------
++ *-----------------------------------------------------------------------------
++ */
++
++
++#endif /* _REGS_TOUCH_H_ */
projects / openwrt / svn-archive / archive.git / blobdiff