--- 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 @@ -200,6 +200,15 @@ 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 @@ -25,6 +25,7 @@ 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-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o --- /dev/null +++ b/drivers/input/touchscreen/ep93xx_ts.c @@ -0,0 +1,1021 @@ +/* + * 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> + +/* 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");