diff options
Diffstat (limited to 'target/linux/ep93xx/patches-3.3/003-ep93xx_touchscreen.patch')
| -rw-r--r-- | target/linux/ep93xx/patches-3.3/003-ep93xx_touchscreen.patch | 1061 |
1 files changed, 1061 insertions, 0 deletions
diff --git a/target/linux/ep93xx/patches-3.3/003-ep93xx_touchscreen.patch b/target/linux/ep93xx/patches-3.3/003-ep93xx_touchscreen.patch new file mode 100644 index 0000000000..f37836d998 --- /dev/null +++ b/target/linux/ep93xx/patches-3.3/003-ep93xx_touchscreen.patch @@ -0,0 +1,1061 @@ +--- + 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"); |