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-rw-r--r--target/linux/ep93xx/patches-3.18/003-ep93xx_touchscreen.patch1072
1 files changed, 1072 insertions, 0 deletions
diff --git a/target/linux/ep93xx/patches-3.18/003-ep93xx_touchscreen.patch b/target/linux/ep93xx/patches-3.18/003-ep93xx_touchscreen.patch
new file mode 100644
index 0000000000..e1613a030f
--- /dev/null
+++ b/target/linux/ep93xx/patches-3.18/003-ep93xx_touchscreen.patch
@@ -0,0 +1,1072 @@
+---
+ arch/arm/mach-ep93xx/include/mach/hardware.h | 1
+ arch/arm/mach-ep93xx/include/mach/regs_touch.h | 95 ++
+ drivers/input/touchscreen/Kconfig | 5
+ drivers/input/touchscreen/Makefile | 1
+ drivers/input/touchscreen/ep93xx_ts.c | 1117 +++++++++++++++++++++++++
+ drivers/input/touchscreen/ep93xx_ts.h | 53 +
+ 6 files changed, 1272 insertions(+)
+
+--- a/drivers/input/touchscreen/Kconfig
++++ b/drivers/input/touchscreen/Kconfig
+@@ -282,6 +282,15 @@ config TOUCHSCREEN_EGALAX
+ To compile this driver as a module, choose M here: the
+ module will be called egalax_ts.
+
++config TOUCHSCREEN_EP93XX
++ tristate "EP93xx Touchscreen"
++ depends on ARM && INPUT && ARCH_EP93XX
++ help
++ Say Y here to enable support for EP93xx touch screen.
++
++ To compile this driver as a module, choose M here:
++ the module will be called ep93xx_ts.
++
+ config TOUCHSCREEN_FUJITSU
+ tristate "Fujitsu serial touchscreen"
+ select SERIO
+--- a/drivers/input/touchscreen/Makefile
++++ b/drivers/input/touchscreen/Makefile
+@@ -33,6 +33,7 @@ obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunz
+ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
+ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
++obj-$(CONFIG_TOUCHSCREEN_EP93XX) += ep93xx_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
+ obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
+--- /dev/null
++++ b/drivers/input/touchscreen/ep93xx_ts.c
+@@ -0,0 +1,1022 @@
++/*
++ * 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 <linux/semaphore.h>
++#include <asm/irq.h>
++#include <mach/hardware.h>
++#include <asm/io.h>
++#include "../../../arch/arm/mach-ep93xx/soc.h"
++
++/* This stuff should be in ep93xx-regs.h */
++#define EP93XX_TOUCHSCREEN_REG(x) (EP93XX_TOUCHSCREEN_BASE + (x))
++/* R/W touchscreen controller setup control register. */
++#define EP93XX_TOUCHSCREEN_SETUP EP93XX_TOUCHSCREEN_REG(0x00)
++/* R/W touchscreen controller max/min register. */
++#define EP93XX_TOUCHSCREEN_XYMAXMIN EP93XX_TOUCHSCREEN_REG(0x04)
++/* R touchscreen controller result register. */
++#define EP93XX_TOUCHSCREEN_XYRESULT EP93XX_TOUCHSCREEN_REG(0x08)
++/* LOCKED R/W touchscreen Switch Matrix control register. */
++#define EP93XX_TOUCHSCREEN_DISCHARGE EP93XX_TOUCHSCREEN_REG(0x0C)
++#define EP93XX_TOUCHSCREEN_XSAMPLE EP93XX_TOUCHSCREEN_REG(0x10)
++#define EP93XX_TOUCHSCREEN_YSAMPLE EP93XX_TOUCHSCREEN_REG(0x14)
++#define EP93XX_TOUCHSCREEN_DIRECT EP93XX_TOUCHSCREEN_REG(0x18)
++#define EP93XX_TOUCHSCREEN_DETECT EP93XX_TOUCHSCREEN_REG(0x1C)
++/* NA R/W touchscreen software lock register. */
++#define EP93XX_TOUCHSCREEN_SWLOCK EP93XX_TOUCHSCREEN_REG(0x20)
++/* R/W touchscreen setup control register #2. */
++#define EP93XX_TOUCHSCREEN_SETUP2 EP93XX_TOUCHSCREEN_REG(0x24)
++
++/* These are duplicated in mach-ep93xx/core.c */
++#define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x))
++#define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20)
++#define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24)
++#define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28)
++#define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c)
++
++/*
++ * Register bit definitions
++ */
++#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
++
++/*
++ * 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
++
++/*
++ * 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 bFreshTouchData;
++static int bCurrentPenDown;
++
++static DECLARE_WAIT_QUEUE_HEAD(queue);
++static DEFINE_SEMAPHORE(open_sem);
++static DEFINE_SPINLOCK(event_buffer_lock);
++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);
++
++/*
++ * ep93xx_ts_isr
++ */
++static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
++{
++ /*
++ * 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)
++{
++ /*
++ * 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;
++
++ 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)
++{
++ poll_wait(filp, &queue, wait);
++
++ if (bFreshTouchData)
++ {
++ return POLLIN | POLLRDNORM;
++ }
++
++ return 0;
++}
++
++static int ep93xx_ts_open(struct inode *inode, struct file *filp)
++{
++ 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:
++ i = copy_to_user((void __user *)u, (void *)version, sizeof(version));
++ iReturn = i ? -EFAULT : 0;
++ break;
++
++ case EVIOCGBIT(0,sizeof(u_int32_t) * 8) :
++ i = copy_to_user((void __user *)u, (void *)bit, sizeof(bit));
++ iReturn = i ? -EFAULT : 0;
++ break;
++
++ case EVIOCGBIT(EV_ABS, sizeof(absbit) * 8):
++ i = copy_to_user((void __user *)u, (void *)absbit, sizeof(absbit));
++ iReturn = i ? -EFAULT : 0;
++ break;
++ default:
++ 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,
++ unlocked_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;
++
++ /*
++ * Set the TSEN bit in KTDIV so that we are enabling the clock
++ * for the touchscreen.
++ */
++ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
++ uiKTDIV |= EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
++ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
++
++ /*
++ * Program the EP93XX_TOUCHSCREEN_SETUP and TSSetup2 registers.
++ */
++ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
++ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
++
++ /*
++ * Set the the touch settings.
++ */
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
++
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DISCHARGE);
++
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiSwitchZ1, EP93XX_TOUCHSCREEN_XSAMPLE);
++
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiSwitchZ2, EP93XX_TOUCHSCREEN_YSAMPLE);
++
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiDetect, EP93XX_TOUCHSCREEN_DETECT);
++
++ /*
++ * 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;
++ __raw_writel(uiTSXYMaxMin, EP93XX_TOUCHSCREEN_XYMAXMIN);
++
++ 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;
++
++ sTouch.state = TS_STATE_STOPPED;
++ Stop_Timer2();
++
++ /*
++ * Disable the scanning engine.
++ */
++ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP);
++ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP2);
++
++ /*
++ * Clear the TSEN bit in KTDIV so that we are disabling the clock
++ * for the touchscreen.
++ */
++ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
++ uiKTDIV &= ~EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
++ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
++
++} /* ep93xx_ts_shutdown */
++
++static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id)
++{
++ 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);
++
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
++
++ 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.
++ */
++ __raw_writel(1, EP93XX_TIMER2_CLEAR);
++ 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();
++
++ /*
++ * 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)
++ {
++ bCurrentPenDown = 0;
++ ee93xx_ts_evt_add(0, guiLastX, guiLastY, 0);
++ TS_Hardware_Scan_Mode();
++ return;
++ }
++
++ /*
++ * Hysteresis:
++ * 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)
++ {
++ bValidPoint = 1;
++ }
++ }
++ else
++ {
++ 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;
++ }
++
++ TS_Hardware_Scan_Mode();
++}
++
++static void ep93xx_ts_set_direct(unsigned int uiADCSwitch)
++{
++ unsigned int uiResult;
++
++ /*
++ * Set the switch settings in the direct register.
++ */
++ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
++ __raw_writel(uiADCSwitch, EP93XX_TOUCHSCREEN_DIRECT);
++
++ /*
++ * Read and throw away the first sample.
++ */
++ do {
++ uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
++ } 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 = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
++ } 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;
++
++ /*
++ * 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 = __raw_readl(EP93XX_SYSCON_DEVCFG);
++ ep93xx_syscon_swlocked_write(uiDevCfg & ~EP93XX_SYSCON_DEVCFG_TIN,
++ EP93XX_SYSCON_DEVCFG);
++
++ /*
++ * Enable the touch screen scanning state machine by setting
++ * the ENABLE bit.
++ */
++ __raw_writel(TSSETUP_DEFAULT | TSSETUP_ENABLE, EP93XX_TOUCHSCREEN_SETUP);
++
++ /*
++ * Set the flag to show that we are in interrupt mode.
++ */
++ gScanningMode = TS_MODE_HARDWARE_SCAN;
++
++ /*
++ * Initialize EP93XX_TOUCHSCREEN_SETUP2 register.
++ */
++ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
++
++}
++
++/*
++ * TS_Soft_Scan_Mode
++ *
++ * Sets the touch screen to manual polling mode.
++ */
++static void TS_Soft_Scan_Mode(void)
++{
++ unsigned int uiDevCfg;
++
++ if (gScanningMode != TS_MODE_SOFT_SCAN)
++ {
++ /*
++ * Disable the touch screen scanning state machine by clearing
++ * the ENABLE bit.
++ */
++ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
++
++ /*
++ * Set the TIN bit so we can do manual touchscreen polling.
++ */
++ uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
++ ep93xx_syscon_swlocked_write(uiDevCfg | EP93XX_SYSCON_DEVCFG_TIN,
++ EP93XX_SYSCON_DEVCFG);
++ }
++
++ /*
++ * 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
++ */
++ __raw_writel(0, EP93XX_TIMER2_CONTROL);
++
++ uiClockTicks = ((uiDelay_uSec * 508) + 999) / 1000;
++ __raw_writel(uiClockTicks, EP93XX_TIMER2_LOAD);
++ __raw_writel(uiClockTicks, EP93XX_TIMER2_VALUE);
++
++ /*
++ * Set up Timer 2 for 508 kHz clock and periodic mode.
++ */
++ __raw_writel(0xC8, EP93XX_TIMER2_CONTROL);
++
++}
++
++static void Stop_Timer2(void)
++{
++ __raw_writel(0, EP93XX_TIMER2_CONTROL);
++}
++
++/*
++ * Initialization and exit routines
++ */
++int __init ep93xx_ts_init(void)
++{
++ int retval;
++
++ 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;
++ }
++
++ 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");
++ free_irq(IRQ_EP93XX_TOUCH, 0);
++ return retval;
++ }
++
++ 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)
++{
++ 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");
++MODULE_LICENSE("GPL");
+--- a/arch/arm/mach-ep93xx/core.c
++++ b/arch/arm/mach-ep93xx/core.c
+@@ -211,6 +211,7 @@ void ep93xx_syscon_swlocked_write(unsign
+
+ spin_unlock_irqrestore(&syscon_swlock, flags);
+ }
++EXPORT_SYMBOL(ep93xx_syscon_swlocked_write);
+
+ void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
+ {
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