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openwrt/target/linux/ep93xx/patches-2.6.30/006-ep93xx-touchscreen.patch

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add support for the Simplemachines Sim.One board SVN-Revision: 18540
2009-11-25 23:43:48 +00:00
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 @@
+/*
+ * ep93xx_ts.h
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License
+ * at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * The initial developer of the original code is David A. Hinds
+ * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
+ * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use
+ * your version of this file under the MPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the MPL or the GPL.
+ */
+
+#ifndef _LINUX_EP93XX_TS_H
+#define _LINUX_EP93XX_TS_H
+
+/*touchscreen register defines*/
+#define SYSCON_KTDIV EP93XX_SYSCON_KEY_TOUCH_CLOCK_DIV
+#define SYSCON_SWLOCK EP93XX_SYSCON_SWLOCK
+#define TSSetup EP93XX_TOUCHSCREEN_TSSetup
+#define TSXYMaxMin EP93XX_TOUCHSCREEN_TSXYMaxMin
+#define TSXYResult EP93XX_TOUCHSCREEN_TSDischarge
+#define TSDischarge EP93XX_TOUCHSCREEN_TSDischarge
+#define TSXSample EP93XX_TOUCHSCREEN_TSXSample
+#define TSYSample EP93XX_TOUCHSCREEN_TSYSample
+#define TSDirect EP93XX_TOUCHSCREEN_TSDirect
+#define TSDetect EP93XX_TOUCHSCREEN_TSDetect
+#define TSSWLock EP93XX_TOUCHSCREEN_TSSWLock
+#define TSSetup2 EP93XX_TOUCHSCREEN_TSSetup2
+
+
+//#define SYSCON_DEVCFG EP93XX_SYSCON_DEVICE_CONFIG
+#define TIMER2CONTROL EP93XX_TIMER2_CONTROL
+#define TIMER2LOAD EP93XX_TIMER2_LOAD
+#define TIMER2VALUE EP93XX_TIMER2_VALUE
+#define TIMER2CLEAR EP93XX_TIMER2_CLEAR
+#endif
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_ */