mirror of https://github.com/hak5/openwrt.git
1061 lines
28 KiB
Diff
1061 lines
28 KiB
Diff
---
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arch/arm/mach-ep93xx/include/mach/hardware.h | 1
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arch/arm/mach-ep93xx/include/mach/regs_touch.h | 95 ++
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drivers/input/touchscreen/Kconfig | 5
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drivers/input/touchscreen/Makefile | 1
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drivers/input/touchscreen/ep93xx_ts.c | 1117 +++++++++++++++++++++++++
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drivers/input/touchscreen/ep93xx_ts.h | 53 +
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6 files changed, 1272 insertions(+)
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--- a/drivers/input/touchscreen/Kconfig
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+++ b/drivers/input/touchscreen/Kconfig
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@@ -153,6 +153,15 @@ config TOUCHSCREEN_EETI
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To compile this driver as a module, choose M here: the
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module will be called eeti_ts.
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+config TOUCHSCREEN_EP93XX
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+ tristate "EP93xx Touchscreen"
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+ depends on ARM && INPUT && ARCH_EP93XX
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+ help
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+ Say Y here to enable support for EP93xx touch screen.
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+
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+ To compile this driver as a module, choose M here:
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+ the module will be called ep93xx_ts.
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+
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config TOUCHSCREEN_FUJITSU
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tristate "Fujitsu serial touchscreen"
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select SERIO
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--- a/drivers/input/touchscreen/Makefile
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+++ b/drivers/input/touchscreen/Makefile
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@@ -21,6 +21,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += h
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obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
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obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
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obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
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+obj-$(CONFIG_TOUCHSCREEN_EP93XX) += ep93xx_ts.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
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obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o
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--- /dev/null
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+++ b/drivers/input/touchscreen/ep93xx_ts.c
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@@ -0,0 +1,1020 @@
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+/*
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+ * linux/drivers/input/touchscreen/ep93xx_ts.c
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+ *
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+ * Copyright (C) 2003-2004 Cirrus Corp.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/types.h>
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+#include <linux/delay.h>
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+#include <linux/wait.h>
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+#include <linux/fs.h>
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+#include <linux/sched.h>
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+#include <linux/poll.h>
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+#include <linux/miscdevice.h>
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+#include <linux/init.h>
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+#include <linux/compiler.h>
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+#include <linux/timer.h>
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+#include <linux/interrupt.h>
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+#include <linux/syscalls.h>
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+#include <linux/input.h>
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+#include <asm/irq.h>
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+#include <mach/hardware.h>
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+#include <asm/io.h>
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+
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+/* This stuff should be in ep93xx-regs.h */
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+#define EP93XX_TOUCHSCREEN_REG(x) (EP93XX_TOUCHSCREEN_BASE + (x))
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+/* R/W touchscreen controller setup control register. */
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+#define EP93XX_TOUCHSCREEN_SETUP EP93XX_TOUCHSCREEN_REG(0x00)
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+/* R/W touchscreen controller max/min register. */
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+#define EP93XX_TOUCHSCREEN_XYMAXMIN EP93XX_TOUCHSCREEN_REG(0x04)
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+/* R touchscreen controller result register. */
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+#define EP93XX_TOUCHSCREEN_XYRESULT EP93XX_TOUCHSCREEN_REG(0x08)
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+/* LOCKED R/W touchscreen Switch Matrix control register. */
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+#define EP93XX_TOUCHSCREEN_DISCHARGE EP93XX_TOUCHSCREEN_REG(0x0C)
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+#define EP93XX_TOUCHSCREEN_XSAMPLE EP93XX_TOUCHSCREEN_REG(0x10)
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+#define EP93XX_TOUCHSCREEN_YSAMPLE EP93XX_TOUCHSCREEN_REG(0x14)
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+#define EP93XX_TOUCHSCREEN_DIRECT EP93XX_TOUCHSCREEN_REG(0x18)
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+#define EP93XX_TOUCHSCREEN_DETECT EP93XX_TOUCHSCREEN_REG(0x1C)
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+/* NA R/W touchscreen software lock register. */
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+#define EP93XX_TOUCHSCREEN_SWLOCK EP93XX_TOUCHSCREEN_REG(0x20)
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+/* R/W touchscreen setup control register #2. */
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+#define EP93XX_TOUCHSCREEN_SETUP2 EP93XX_TOUCHSCREEN_REG(0x24)
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+
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+/* These are duplicated in mach-ep93xx/core.c */
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+#define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x))
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+#define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20)
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+#define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24)
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+#define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28)
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+#define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c)
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+
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+/*
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+ * Register bit definitions
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+ */
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+#define TSSETUP_SDLY_MASK 0x000003FF
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+#define TSSETUP_SDLY_SHIFT 0
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+#define TSSETUP_NSMP_4 0x00000000
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+#define TSSETUP_NSMP_8 0x00000400
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+#define TSSETUP_NSMP_16 0x00000800
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+#define TSSETUP_NSMP_32 0x00000C00
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+#define TSSETUP_NSMP_MASK 0x00000C00
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+#define TSSETUP_DEV_4 0x00000000
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+#define TSSETUP_DEV_8 0x00001000
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+#define TSSETUP_DEV_12 0x00002000
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+#define TSSETUP_DEV_16 0x00003000
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+#define TSSETUP_DEV_24 0x00004000
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+#define TSSETUP_DEV_32 0x00005000
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+#define TSSETUP_DEV_64 0x00006000
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+#define TSSETUP_DEV_128 0x00007000
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+#define TSSETUP_ENABLE 0x00008000
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+#define TSSETUP_DLY_MASK 0x03FF0000
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+#define TSSETUP_DLY_SHIFT 16
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+#define TSSETUP_TDTCT 0x80000000
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+
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+#define TSMAXMIN_XMIN_MASK 0x000000FF
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+#define TSMAXMIN_XMIN_SHIFT 0
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+#define TSMAXMIN_YMIN_MASK 0x0000FF00
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+#define TSMAXMIN_YMIN_SHIFT 8
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+#define TSMAXMIN_XMAX_MASK 0x00FF0000
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+#define TSMAXMIN_XMAX_SHIFT 16
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+#define TSMAXMIN_YMAX_MASK 0xFF000000
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+#define TSMAXMIN_YMAX_SHIFT 24
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+
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+#define TSXYRESULT_X_MASK 0x00000FFF
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+#define TSXYRESULT_X_SHIFT 0
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+#define TSXYRESULT_AD_MASK 0x0000FFFF
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+#define TSXYRESULT_AD_SHIFT 0
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+#define TSXYRESULT_Y_MASK 0x0FFF0000
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+#define TSXYRESULT_Y_SHIFT 16
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+#define TSXYRESULT_SDR 0x80000000
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+
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+#define TSX_SAMPLE_MASK 0x00003FFF
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+#define TSX_SAMPLE_SHIFT 0x00
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+#define TSY_SAMPLE_MASK 0x3FFF0000
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+#define TSY_SAMPLE_SHIFT 0x10
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+
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+#define TSSETUP2_TINT 0x00000001
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+#define TSSETUP2_NICOR 0x00000002
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+#define TSSETUP2_PINT 0x00000004
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+#define TSSETUP2_PENSTS 0x00000008
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+#define TSSETUP2_PINTEN 0x00000010
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+#define TSSETUP2_DEVINT 0x00000020
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+#define TSSETUP2_DINTEN 0x00000040
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+#define TSSETUP2_DTMEN 0x00000080
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+#define TSSETUP2_DISDEV 0x00000100
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+#define TSSETUP2_NSIGND 0x00000200
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+#define TSSETUP2_S28EN 0x00000400
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+#define TSSETUP2_RINTEN 0x00000800
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+
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+#define TSXYRESULT_SDR 0x80000000
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+
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+/*
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+ * These are used as trigger levels to know when we have pen up/down.
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+ * The rules:
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+ * 1. TS_HEAVY_INV_PRESSURE < TS_LIGHT_INV_PRESSURE because these
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+ * are Inverse pressure.
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+ * 2. Any touch lighter than TS_LIGHT_INV_PRESSURE is a pen up.
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+ * 3. Any touch heavier than TS_HEAVY_INV_PRESSURE is a pen down.
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+ */
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+#define TS_HEAVY_INV_PRESSURE 0xFE0 /* C00 */
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+#define TS_LIGHT_INV_PRESSURE 0xFFF /* e00 */
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+
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+/*
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+ * If the x, y, or inverse pressure changes more than these values
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+ * between two succeeding points, the point is not reported.
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+ */
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+#define TS_MAX_VALID_XY_CHANGE 0x300
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+#define TS_MAX_VALID_PRESSURE_CHANGE 0x100
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+
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+/*
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+ * This is the minimum Z1 Value that is valid.
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+ */
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+#define MIN_Z1_VALUE 0x50
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+
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+/*
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+ * Settling delay for taking each ADC measurement. Increase this
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+ * if ts is jittery.
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+ */
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+#define EP93XX_TS_ADC_DELAY_USEC 2000
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+
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+/*
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+ * Delay between TS points.
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+ */
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+#define EP93XX_TS_PER_POINT_DELAY_USEC 10000
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+
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+/*
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+ * A few more macros...
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+ */
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+#define TSSETUP_DEFAULT (TSSETUP_NSMP_32 | TSSETUP_DEV_64 | \
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+ ((128<<TSSETUP_SDLY_SHIFT) & TSSETUP_SDLY_MASK) | \
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+ ((128<<TSSETUP_DLY_SHIFT) & TSSETUP_DLY_MASK))
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+
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+#define TSSETUP2_DEFAULT (TSSETUP2_NSIGND)
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+
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+/*
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+ * For now, we use one of the minor numbers from the local/experimental
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+ * range.
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+ */
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+#define EP93XX_TS_MINOR 240
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+
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+/*
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+ * Static Declarations
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+ */
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+static unsigned int guiLastX, guiLastY;
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+static unsigned int guiLastInvPressure;
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+
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+struct TouchScreenSample
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+{
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+ int currentX;
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+ int currentY;
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+ int currentButton;
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+ int currentPressure;
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+ struct timeval currentTime;
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+};
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+
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+/*
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+ * This must match the structure in tslib.
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+ */
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+struct ts_sample {
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+ int x;
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+ int y;
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+ unsigned int pressure;
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+ struct timeval tv;
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+};
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+
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+static struct TouchScreenSample gSample;
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+static int bFreshTouchData;
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+static int bCurrentPenDown;
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+
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+static DECLARE_WAIT_QUEUE_HEAD(queue);
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+static DECLARE_MUTEX(open_sem);
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+static spinlock_t event_buffer_lock = SPIN_LOCK_UNLOCKED;
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+static struct fasync_struct *ep93xx_fasync;
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+
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+/*
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+ * Typedef Declarations
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+ */
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+typedef enum {
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+ TS_MODE_UN_INITIALIZED,
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+ TS_MODE_HARDWARE_SCAN,
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+ TS_MODE_SOFT_SCAN
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+} ts_mode_t;
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+
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+static ts_mode_t gScanningMode;
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+
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+typedef enum{
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+ TS_STATE_STOPPED = 0,
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+ TS_STATE_Z1,
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+ TS_STATE_Z2,
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+ TS_STATE_Y,
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+ TS_STATE_X,
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+ TS_STATE_DONE
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+} ts_states_t;
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+
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+typedef struct
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+{
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+ unsigned int uiX;
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+ unsigned int uiY;
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+ unsigned int uiZ1;
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+ unsigned int uiZ2;
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+ ts_states_t state;
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+} ts_struct_t;
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+
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+static ts_struct_t sTouch;
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+
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+/*
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+ * From the spec, here's how to set up the touch screen's switch registers.
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+ */
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+typedef struct
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+{
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+ unsigned int uiDetect;
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+ unsigned int uiDischarge;
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+ unsigned int uiXSample;
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+ unsigned int uiYSample;
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+ unsigned int uiSwitchZ1;
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+ unsigned int uiSwitchZ2;
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+}SwitchStructType;
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+
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+/*
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+ * Here's the switch settings for a 4-wire touchscreen. See the spec
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+ * for how to handle a 4, 7, or 8-wire.
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+ */
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+const static SwitchStructType sSwitchSettings =
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+/* s28en=0 */
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+/* TSDetect TSDischarge TSXSample TSYSample SwitchZ1 SwitchZ2 */
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+ {0x00403604, 0x0007fe04, 0x00081604, 0x00104601, 0x00101601, 0x00101608};
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+
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+/*
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+ * Function declarations
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+ */
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+static void ep93xx_ts_set_direct(unsigned int uiADCSwitch);
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+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id);
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+static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id);
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+static void ee93xx_ts_evt_add(int button, int dX, int dY, int Pressure);
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+static ssize_t ep93xx_ts_read(struct file *filp, char *buf,
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+ size_t count, loff_t *l);
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+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait);
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+static int ep93xx_ts_open(struct inode *inode, struct file *filp);
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+static int ep93xx_ts_fasync(int fd, struct file *filp, int on);
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+static int ep93xx_ts_release(struct inode *inode, struct file *filp);
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+static ssize_t ep93xx_ts_write(struct file *file, const char *buffer,
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+ size_t count, loff_t *ppos);
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+static void ep93xx_ts_setup(void);
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+static void ep93xx_ts_shutdown(void);
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+int __init ep93xx_ts_init(void);
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+void __exit ep93xx_ts_exit(void);
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+static unsigned int CalculateInvPressure(void);
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+static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff);
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+static void TS_Soft_Scan_Mode(void);
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+static void TS_Hardware_Scan_Mode(void);
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+static void ProcessPointData(void);
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+static void Set_Timer2_uSec(unsigned int Delay_mSec);
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+static void Stop_Timer2(void);
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+
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+/*
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+ * ep93xx_ts_isr
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+ */
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+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
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+{
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+ /*
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+ * Note that we don't clear the interrupt here. The interrupt
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+ * gets cleared in TS_Soft_Scan_Mode when the TS ENABLE
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+ * bit is cleared.
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+ */
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+
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+ /*
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+ * Set the ts to manual polling mode and schedule a callback.
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+ * That way we can return from the isr in a reasonable amount of
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+ * time and process the touch in the callback after a brief delay.
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+ */
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+ TS_Soft_Scan_Mode();
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+
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+ return(IRQ_HANDLED);
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+}
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+
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+/*
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+ * Save the current ts 'event' in an atomic fashion.
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+ */
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+static void ee93xx_ts_evt_add(int buttons, int iX, int iY, int iPressure)
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+{
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+ /*
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+ * Note the event, but use spinlocks to keep it from getting
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+ * halfway read if we get interrupted.
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+ */
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+
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+ spin_lock(&event_buffer_lock);
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+
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+ gSample.currentX = iX;
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+ gSample.currentY = iY;
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+ gSample.currentButton = buttons;
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+ gSample.currentPressure = iPressure;
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+ bFreshTouchData = 1;
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+ do_gettimeofday(&gSample.currentTime);
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+
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+ spin_unlock(&event_buffer_lock);
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+
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+ kill_fasync(&ep93xx_fasync, SIGIO, POLL_IN);
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+ wake_up_interruptible(&queue);
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+}
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+
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+
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+static ssize_t ep93xx_ts_read(struct file *filp, char *buf, size_t count, loff_t *l)
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+{
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+ unsigned short data[3];
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+ struct ts_sample ts_data;
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+ int iReturn = -EFAULT;
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+
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+ if (!bFreshTouchData)
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+ {
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+ iReturn = 0;
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+ }
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+ else if (count == sizeof(data))
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+ {
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+ spin_lock_irq(&event_buffer_lock);
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+ bFreshTouchData = 0;
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+ data[0] = gSample.currentX;
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+ data[1] = gSample.currentY;
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+ data[2] = gSample.currentButton;
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+
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+ spin_unlock_irq(&event_buffer_lock);
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+
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+ if (copy_to_user(buf, data, sizeof data))
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+ return -EFAULT;
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+
|
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+ count -= sizeof(data);
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+
|
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+ /* return the # of bytes that got read */
|
|
+ iReturn = sizeof(data) ;
|
|
+ }
|
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+ else if (count == sizeof(struct ts_sample) )
|
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+ {
|
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+ spin_lock_irq(&event_buffer_lock);
|
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+ bFreshTouchData = 0;
|
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+ ts_data.x = gSample.currentX;
|
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+ ts_data.y = gSample.currentY;
|
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+ ts_data.pressure = gSample.currentPressure;
|
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+ ts_data.tv = gSample.currentTime;
|
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+ spin_unlock_irq(&event_buffer_lock);
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+
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+ if (copy_to_user(buf, &ts_data, sizeof(struct ts_sample)))
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+ {
|
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+ iReturn = -EFAULT;
|
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+ }
|
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+ else
|
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+ {
|
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+ count -= sizeof(ts_data);
|
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+ iReturn = sizeof(ts_data);
|
|
+ }
|
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+ }
|
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+
|
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+ return iReturn;
|
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+}
|
|
+
|
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+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait)
|
|
+{
|
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+ poll_wait(filp, &queue, wait);
|
|
+
|
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+ if (bFreshTouchData)
|
|
+ {
|
|
+ return POLLIN | POLLRDNORM;
|
|
+ }
|
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+
|
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+ return 0;
|
|
+}
|
|
+
|
|
+static int ep93xx_ts_open(struct inode *inode, struct file *filp)
|
|
+{
|
|
+ if (down_trylock(&open_sem))
|
|
+ {
|
|
+ return -EBUSY;
|
|
+ }
|
|
+
|
|
+ ep93xx_ts_setup();
|
|
+
|
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+ 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");
|