Root/target/linux/ep93xx/patches-3.6/003-ep93xx_touchscreen.patch

1---
2 arch/arm/mach-ep93xx/include/mach/hardware.h | 1
3 arch/arm/mach-ep93xx/include/mach/regs_touch.h | 95 ++
4 drivers/input/touchscreen/Kconfig | 5
5 drivers/input/touchscreen/Makefile | 1
6 drivers/input/touchscreen/ep93xx_ts.c | 1117 +++++++++++++++++++++++++
7 drivers/input/touchscreen/ep93xx_ts.h | 53 +
8 6 files changed, 1272 insertions(+)
9
10--- a/drivers/input/touchscreen/Kconfig
11+++ b/drivers/input/touchscreen/Kconfig
12@@ -247,6 +247,15 @@ config TOUCHSCREEN_EGALAX
13       To compile this driver as a module, choose M here: the
14       module will be called egalax_ts.
15 
16+config TOUCHSCREEN_EP93XX
17+ tristate "EP93xx Touchscreen"
18+ depends on ARM && INPUT && ARCH_EP93XX
19+ help
20+ Say Y here to enable support for EP93xx touch screen.
21+
22+ To compile this driver as a module, choose M here:
23+ the module will be called ep93xx_ts.
24+
25 config TOUCHSCREEN_FUJITSU
26     tristate "Fujitsu serial touchscreen"
27     select SERIO
28--- a/drivers/input/touchscreen/Makefile
29+++ b/drivers/input/touchscreen/Makefile
30@@ -30,6 +30,7 @@ obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunz
31 obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
32 obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
33 obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
34+obj-$(CONFIG_TOUCHSCREEN_EP93XX) += ep93xx_ts.o
35 obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
36 obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
37 obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
38--- /dev/null
39+++ b/drivers/input/touchscreen/ep93xx_ts.c
40@@ -0,0 +1,1022 @@
41+/*
42+ * linux/drivers/input/touchscreen/ep93xx_ts.c
43+ *
44+ * Copyright (C) 2003-2004 Cirrus Corp.
45+ *
46+ * This program is free software; you can redistribute it and/or modify
47+ * it under the terms of the GNU General Public License version 2 as
48+ * published by the Free Software Foundation.
49+ */
50+
51+#include <linux/module.h>
52+#include <linux/types.h>
53+#include <linux/delay.h>
54+#include <linux/wait.h>
55+#include <linux/fs.h>
56+#include <linux/sched.h>
57+#include <linux/poll.h>
58+#include <linux/miscdevice.h>
59+#include <linux/init.h>
60+#include <linux/compiler.h>
61+#include <linux/timer.h>
62+#include <linux/interrupt.h>
63+#include <linux/syscalls.h>
64+#include <linux/input.h>
65+#include <linux/semaphore.h>
66+#include <asm/irq.h>
67+#include <mach/hardware.h>
68+#include <asm/io.h>
69+#include "../../../arch/arm/mach-ep93xx/soc.h"
70+
71+/* This stuff should be in ep93xx-regs.h */
72+#define EP93XX_TOUCHSCREEN_REG(x) (EP93XX_TOUCHSCREEN_BASE + (x))
73+/* R/W touchscreen controller setup control register. */
74+#define EP93XX_TOUCHSCREEN_SETUP EP93XX_TOUCHSCREEN_REG(0x00)
75+/* R/W touchscreen controller max/min register. */
76+#define EP93XX_TOUCHSCREEN_XYMAXMIN EP93XX_TOUCHSCREEN_REG(0x04)
77+/* R touchscreen controller result register. */
78+#define EP93XX_TOUCHSCREEN_XYRESULT EP93XX_TOUCHSCREEN_REG(0x08)
79+/* LOCKED R/W touchscreen Switch Matrix control register. */
80+#define EP93XX_TOUCHSCREEN_DISCHARGE EP93XX_TOUCHSCREEN_REG(0x0C)
81+#define EP93XX_TOUCHSCREEN_XSAMPLE EP93XX_TOUCHSCREEN_REG(0x10)
82+#define EP93XX_TOUCHSCREEN_YSAMPLE EP93XX_TOUCHSCREEN_REG(0x14)
83+#define EP93XX_TOUCHSCREEN_DIRECT EP93XX_TOUCHSCREEN_REG(0x18)
84+#define EP93XX_TOUCHSCREEN_DETECT EP93XX_TOUCHSCREEN_REG(0x1C)
85+/* NA R/W touchscreen software lock register. */
86+#define EP93XX_TOUCHSCREEN_SWLOCK EP93XX_TOUCHSCREEN_REG(0x20)
87+/* R/W touchscreen setup control register #2. */
88+#define EP93XX_TOUCHSCREEN_SETUP2 EP93XX_TOUCHSCREEN_REG(0x24)
89+
90+/* These are duplicated in mach-ep93xx/core.c */
91+#define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x))
92+#define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20)
93+#define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24)
94+#define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28)
95+#define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c)
96+
97+/*
98+ * Register bit definitions
99+ */
100+#define TSSETUP_SDLY_MASK 0x000003FF
101+#define TSSETUP_SDLY_SHIFT 0
102+#define TSSETUP_NSMP_4 0x00000000
103+#define TSSETUP_NSMP_8 0x00000400
104+#define TSSETUP_NSMP_16 0x00000800
105+#define TSSETUP_NSMP_32 0x00000C00
106+#define TSSETUP_NSMP_MASK 0x00000C00
107+#define TSSETUP_DEV_4 0x00000000
108+#define TSSETUP_DEV_8 0x00001000
109+#define TSSETUP_DEV_12 0x00002000
110+#define TSSETUP_DEV_16 0x00003000
111+#define TSSETUP_DEV_24 0x00004000
112+#define TSSETUP_DEV_32 0x00005000
113+#define TSSETUP_DEV_64 0x00006000
114+#define TSSETUP_DEV_128 0x00007000
115+#define TSSETUP_ENABLE 0x00008000
116+#define TSSETUP_DLY_MASK 0x03FF0000
117+#define TSSETUP_DLY_SHIFT 16
118+#define TSSETUP_TDTCT 0x80000000
119+
120+#define TSMAXMIN_XMIN_MASK 0x000000FF
121+#define TSMAXMIN_XMIN_SHIFT 0
122+#define TSMAXMIN_YMIN_MASK 0x0000FF00
123+#define TSMAXMIN_YMIN_SHIFT 8
124+#define TSMAXMIN_XMAX_MASK 0x00FF0000
125+#define TSMAXMIN_XMAX_SHIFT 16
126+#define TSMAXMIN_YMAX_MASK 0xFF000000
127+#define TSMAXMIN_YMAX_SHIFT 24
128+
129+#define TSXYRESULT_X_MASK 0x00000FFF
130+#define TSXYRESULT_X_SHIFT 0
131+#define TSXYRESULT_AD_MASK 0x0000FFFF
132+#define TSXYRESULT_AD_SHIFT 0
133+#define TSXYRESULT_Y_MASK 0x0FFF0000
134+#define TSXYRESULT_Y_SHIFT 16
135+#define TSXYRESULT_SDR 0x80000000
136+
137+#define TSX_SAMPLE_MASK 0x00003FFF
138+#define TSX_SAMPLE_SHIFT 0x00
139+#define TSY_SAMPLE_MASK 0x3FFF0000
140+#define TSY_SAMPLE_SHIFT 0x10
141+
142+#define TSSETUP2_TINT 0x00000001
143+#define TSSETUP2_NICOR 0x00000002
144+#define TSSETUP2_PINT 0x00000004
145+#define TSSETUP2_PENSTS 0x00000008
146+#define TSSETUP2_PINTEN 0x00000010
147+#define TSSETUP2_DEVINT 0x00000020
148+#define TSSETUP2_DINTEN 0x00000040
149+#define TSSETUP2_DTMEN 0x00000080
150+#define TSSETUP2_DISDEV 0x00000100
151+#define TSSETUP2_NSIGND 0x00000200
152+#define TSSETUP2_S28EN 0x00000400
153+#define TSSETUP2_RINTEN 0x00000800
154+
155+#define TSXYRESULT_SDR 0x80000000
156+
157+/*
158+ * These are used as trigger levels to know when we have pen up/down.
159+ * The rules:
160+ * 1. TS_HEAVY_INV_PRESSURE < TS_LIGHT_INV_PRESSURE because these
161+ * are Inverse pressure.
162+ * 2. Any touch lighter than TS_LIGHT_INV_PRESSURE is a pen up.
163+ * 3. Any touch heavier than TS_HEAVY_INV_PRESSURE is a pen down.
164+ */
165+#define TS_HEAVY_INV_PRESSURE 0xFE0 /* C00 */
166+#define TS_LIGHT_INV_PRESSURE 0xFFF /* e00 */
167+
168+/*
169+ * If the x, y, or inverse pressure changes more than these values
170+ * between two succeeding points, the point is not reported.
171+ */
172+#define TS_MAX_VALID_XY_CHANGE 0x300
173+#define TS_MAX_VALID_PRESSURE_CHANGE 0x100
174+
175+/*
176+ * This is the minimum Z1 Value that is valid.
177+ */
178+#define MIN_Z1_VALUE 0x50
179+
180+/*
181+ * Settling delay for taking each ADC measurement. Increase this
182+ * if ts is jittery.
183+ */
184+#define EP93XX_TS_ADC_DELAY_USEC 2000
185+
186+/*
187+ * Delay between TS points.
188+ */
189+#define EP93XX_TS_PER_POINT_DELAY_USEC 10000
190+
191+/*
192+ * A few more macros...
193+ */
194+#define TSSETUP_DEFAULT (TSSETUP_NSMP_32 | TSSETUP_DEV_64 | \
195+ ((128<<TSSETUP_SDLY_SHIFT) & TSSETUP_SDLY_MASK) | \
196+ ((128<<TSSETUP_DLY_SHIFT) & TSSETUP_DLY_MASK))
197+
198+#define TSSETUP2_DEFAULT (TSSETUP2_NSIGND)
199+
200+/*
201+ * For now, we use one of the minor numbers from the local/experimental
202+ * range.
203+ */
204+#define EP93XX_TS_MINOR 240
205+
206+/*
207+ * Static Declarations
208+ */
209+static unsigned int guiLastX, guiLastY;
210+static unsigned int guiLastInvPressure;
211+
212+struct TouchScreenSample
213+{
214+ int currentX;
215+ int currentY;
216+ int currentButton;
217+ int currentPressure;
218+ struct timeval currentTime;
219+};
220+
221+/*
222+ * This must match the structure in tslib.
223+ */
224+struct ts_sample {
225+ int x;
226+ int y;
227+ unsigned int pressure;
228+ struct timeval tv;
229+};
230+
231+static struct TouchScreenSample gSample;
232+static int bFreshTouchData;
233+static int bCurrentPenDown;
234+
235+static DECLARE_WAIT_QUEUE_HEAD(queue);
236+static DEFINE_SEMAPHORE(open_sem);
237+static DEFINE_SPINLOCK(event_buffer_lock);
238+static struct fasync_struct *ep93xx_fasync;
239+
240+/*
241+ * Typedef Declarations
242+ */
243+typedef enum {
244+ TS_MODE_UN_INITIALIZED,
245+ TS_MODE_HARDWARE_SCAN,
246+ TS_MODE_SOFT_SCAN
247+} ts_mode_t;
248+
249+static ts_mode_t gScanningMode;
250+
251+typedef enum{
252+ TS_STATE_STOPPED = 0,
253+ TS_STATE_Z1,
254+ TS_STATE_Z2,
255+ TS_STATE_Y,
256+ TS_STATE_X,
257+ TS_STATE_DONE
258+} ts_states_t;
259+
260+typedef struct
261+{
262+ unsigned int uiX;
263+ unsigned int uiY;
264+ unsigned int uiZ1;
265+ unsigned int uiZ2;
266+ ts_states_t state;
267+} ts_struct_t;
268+
269+static ts_struct_t sTouch;
270+
271+/*
272+ * From the spec, here's how to set up the touch screen's switch registers.
273+ */
274+typedef struct
275+{
276+ unsigned int uiDetect;
277+ unsigned int uiDischarge;
278+ unsigned int uiXSample;
279+ unsigned int uiYSample;
280+ unsigned int uiSwitchZ1;
281+ unsigned int uiSwitchZ2;
282+}SwitchStructType;
283+
284+/*
285+ * Here's the switch settings for a 4-wire touchscreen. See the spec
286+ * for how to handle a 4, 7, or 8-wire.
287+ */
288+const static SwitchStructType sSwitchSettings =
289+/* s28en=0 */
290+/* TSDetect TSDischarge TSXSample TSYSample SwitchZ1 SwitchZ2 */
291+ {0x00403604, 0x0007fe04, 0x00081604, 0x00104601, 0x00101601, 0x00101608};
292+
293+/*
294+ * Function declarations
295+ */
296+static void ep93xx_ts_set_direct(unsigned int uiADCSwitch);
297+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id);
298+static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id);
299+static void ee93xx_ts_evt_add(int button, int dX, int dY, int Pressure);
300+static ssize_t ep93xx_ts_read(struct file *filp, char *buf,
301+ size_t count, loff_t *l);
302+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait);
303+static int ep93xx_ts_open(struct inode *inode, struct file *filp);
304+static int ep93xx_ts_fasync(int fd, struct file *filp, int on);
305+static int ep93xx_ts_release(struct inode *inode, struct file *filp);
306+static ssize_t ep93xx_ts_write(struct file *file, const char *buffer,
307+ size_t count, loff_t *ppos);
308+static void ep93xx_ts_setup(void);
309+static void ep93xx_ts_shutdown(void);
310+int __init ep93xx_ts_init(void);
311+void __exit ep93xx_ts_exit(void);
312+static unsigned int CalculateInvPressure(void);
313+static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff);
314+static void TS_Soft_Scan_Mode(void);
315+static void TS_Hardware_Scan_Mode(void);
316+static void ProcessPointData(void);
317+static void Set_Timer2_uSec(unsigned int Delay_mSec);
318+static void Stop_Timer2(void);
319+
320+/*
321+ * ep93xx_ts_isr
322+ */
323+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
324+{
325+ /*
326+ * Note that we don't clear the interrupt here. The interrupt
327+ * gets cleared in TS_Soft_Scan_Mode when the TS ENABLE
328+ * bit is cleared.
329+ */
330+
331+ /*
332+ * Set the ts to manual polling mode and schedule a callback.
333+ * That way we can return from the isr in a reasonable amount of
334+ * time and process the touch in the callback after a brief delay.
335+ */
336+ TS_Soft_Scan_Mode();
337+
338+ return(IRQ_HANDLED);
339+}
340+
341+/*
342+ * Save the current ts 'event' in an atomic fashion.
343+ */
344+static void ee93xx_ts_evt_add(int buttons, int iX, int iY, int iPressure)
345+{
346+ /*
347+ * Note the event, but use spinlocks to keep it from getting
348+ * halfway read if we get interrupted.
349+ */
350+
351+ spin_lock(&event_buffer_lock);
352+
353+ gSample.currentX = iX;
354+ gSample.currentY = iY;
355+ gSample.currentButton = buttons;
356+ gSample.currentPressure = iPressure;
357+ bFreshTouchData = 1;
358+ do_gettimeofday(&gSample.currentTime);
359+
360+ spin_unlock(&event_buffer_lock);
361+
362+ kill_fasync(&ep93xx_fasync, SIGIO, POLL_IN);
363+ wake_up_interruptible(&queue);
364+}
365+
366+
367+static ssize_t ep93xx_ts_read(struct file *filp, char *buf, size_t count, loff_t *l)
368+{
369+ unsigned short data[3];
370+ struct ts_sample ts_data;
371+ int iReturn = -EFAULT;
372+
373+ if (!bFreshTouchData)
374+ {
375+ iReturn = 0;
376+ }
377+ else if (count == sizeof(data))
378+ {
379+ spin_lock_irq(&event_buffer_lock);
380+ bFreshTouchData = 0;
381+ data[0] = gSample.currentX;
382+ data[1] = gSample.currentY;
383+ data[2] = gSample.currentButton;
384+
385+ spin_unlock_irq(&event_buffer_lock);
386+
387+ if (copy_to_user(buf, data, sizeof data))
388+ return -EFAULT;
389+
390+ count -= sizeof(data);
391+
392+ /* return the # of bytes that got read */
393+ iReturn = sizeof(data) ;
394+ }
395+ else if (count == sizeof(struct ts_sample) )
396+ {
397+ spin_lock_irq(&event_buffer_lock);
398+ bFreshTouchData = 0;
399+ ts_data.x = gSample.currentX;
400+ ts_data.y = gSample.currentY;
401+ ts_data.pressure = gSample.currentPressure;
402+ ts_data.tv = gSample.currentTime;
403+ spin_unlock_irq(&event_buffer_lock);
404+
405+ if (copy_to_user(buf, &ts_data, sizeof(struct ts_sample)))
406+ {
407+ iReturn = -EFAULT;
408+ }
409+ else
410+ {
411+ count -= sizeof(ts_data);
412+ iReturn = sizeof(ts_data);
413+ }
414+ }
415+
416+ return iReturn;
417+}
418+
419+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait)
420+{
421+ poll_wait(filp, &queue, wait);
422+
423+ if (bFreshTouchData)
424+ {
425+ return POLLIN | POLLRDNORM;
426+ }
427+
428+ return 0;
429+}
430+
431+static int ep93xx_ts_open(struct inode *inode, struct file *filp)
432+{
433+ if (down_trylock(&open_sem))
434+ {
435+ return -EBUSY;
436+ }
437+
438+ ep93xx_ts_setup();
439+
440+ return 0;
441+}
442+
443+/*
444+ * Asynchronous I/O support.
445+ */
446+static int ep93xx_ts_fasync(int fd, struct file *filp, int on)
447+{
448+ int retval;
449+
450+ retval = fasync_helper(fd, filp, on, &ep93xx_fasync);
451+ if (retval < 0)
452+ {
453+ return retval;
454+ }
455+
456+ return 0;
457+}
458+
459+static int ep93xx_ts_release(struct inode *inode, struct file *filp)
460+{
461+ Stop_Timer2();
462+
463+ /*
464+ * Call our async I/O support to request that this file
465+ * cease to be used for async I/O.
466+ */
467+ ep93xx_ts_fasync(-1, filp, 0);
468+
469+ ep93xx_ts_shutdown();
470+
471+ up(&open_sem);
472+
473+ return 0;
474+}
475+
476+static ssize_t ep93xx_ts_write(struct file *file, const char *buffer, size_t count,
477+ loff_t *ppos)
478+{
479+ return -EINVAL;
480+}
481+
482+
483+static int ep93xx_ts_ioctl(struct inode *inode, struct file *file, uint command, ulong u)
484+{
485+ static const int version = EV_VERSION;
486+ static const u_int32_t bit =(1 << EV_ABS);
487+ static const u_int32_t absbit = (1 << ABS_X) | (1 << ABS_Y) | (1 << ABS_PRESSURE);
488+ int iReturn ;
489+ int i = 0;
490+
491+ switch(command)
492+ {
493+ case EVIOCGVERSION:
494+ i = copy_to_user((void __user *)u, (void *)version, sizeof(version));
495+ iReturn = i ? -EFAULT : 0;
496+ break;
497+
498+ case EVIOCGBIT(0,sizeof(u_int32_t) * 8) :
499+ i = copy_to_user((void __user *)u, (void *)bit, sizeof(bit));
500+ iReturn = i ? -EFAULT : 0;
501+ break;
502+
503+ case EVIOCGBIT(EV_ABS, sizeof(absbit) * 8):
504+ i = copy_to_user((void __user *)u, (void *)absbit, sizeof(absbit));
505+ iReturn = i ? -EFAULT : 0;
506+ break;
507+ default:
508+ iReturn = -1;
509+ break;
510+ }
511+
512+ return iReturn;
513+}
514+
515+static struct file_operations ep93xx_ts_fops = {
516+ owner: THIS_MODULE,
517+ read: ep93xx_ts_read,
518+ write: ep93xx_ts_write,
519+ poll: ep93xx_ts_poll,
520+ open: ep93xx_ts_open,
521+ unlocked_ioctl: ep93xx_ts_ioctl,
522+ release: ep93xx_ts_release,
523+ fasync: ep93xx_ts_fasync,
524+};
525+
526+static struct miscdevice ep93xx_ts_miscdev =
527+{
528+ EP93XX_TS_MINOR,
529+ "ep93xx_ts",
530+ &ep93xx_ts_fops
531+};
532+
533+void ep93xx_ts_setup(void)
534+{
535+ unsigned int uiKTDIV, uiTSXYMaxMin;
536+
537+ /*
538+ * Set the TSEN bit in KTDIV so that we are enabling the clock
539+ * for the touchscreen.
540+ */
541+ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
542+ uiKTDIV |= EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
543+ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
544+
545+ /*
546+ * Program the EP93XX_TOUCHSCREEN_SETUP and TSSetup2 registers.
547+ */
548+ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
549+ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
550+
551+ /*
552+ * Set the the touch settings.
553+ */
554+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
555+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
556+
557+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
558+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DISCHARGE);
559+
560+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
561+ __raw_writel(sSwitchSettings.uiSwitchZ1, EP93XX_TOUCHSCREEN_XSAMPLE);
562+
563+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
564+ __raw_writel(sSwitchSettings.uiSwitchZ2, EP93XX_TOUCHSCREEN_YSAMPLE);
565+
566+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
567+ __raw_writel(sSwitchSettings.uiDetect, EP93XX_TOUCHSCREEN_DETECT);
568+
569+ /*
570+ * X,YMin set to 0x40 = have to drag that many pixels for a new irq.
571+ * X,YMax set to 0x40 = 1024 pixels is the maximum movement within the
572+ * time scan limit.
573+ */
574+ uiTSXYMaxMin = (50 << TSMAXMIN_XMIN_SHIFT) & TSMAXMIN_XMIN_MASK;
575+ uiTSXYMaxMin |= (50 << TSMAXMIN_YMIN_SHIFT) & TSMAXMIN_YMIN_MASK;
576+ uiTSXYMaxMin |= (0xff << TSMAXMIN_XMAX_SHIFT) & TSMAXMIN_XMAX_MASK;
577+ uiTSXYMaxMin |= (0xff << TSMAXMIN_YMAX_SHIFT) & TSMAXMIN_YMAX_MASK;
578+ __raw_writel(uiTSXYMaxMin, EP93XX_TOUCHSCREEN_XYMAXMIN);
579+
580+ bCurrentPenDown = 0;
581+ bFreshTouchData = 0;
582+ guiLastX = 0;
583+ guiLastY = 0;
584+ guiLastInvPressure = 0xffffff;
585+
586+ /*
587+ * Enable the touch screen scanning engine.
588+ */
589+ TS_Hardware_Scan_Mode();
590+}
591+
592+/*
593+ * ep93xx_ts_shutdown
594+ *
595+ */
596+static void
597+ep93xx_ts_shutdown(void)
598+{
599+ unsigned int uiKTDIV;
600+
601+ sTouch.state = TS_STATE_STOPPED;
602+ Stop_Timer2();
603+
604+ /*
605+ * Disable the scanning engine.
606+ */
607+ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP);
608+ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP2);
609+
610+ /*
611+ * Clear the TSEN bit in KTDIV so that we are disabling the clock
612+ * for the touchscreen.
613+ */
614+ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
615+ uiKTDIV &= ~EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
616+ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
617+
618+} /* ep93xx_ts_shutdown */
619+
620+static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id)
621+{
622+ switch(sTouch.state)
623+ {
624+ case TS_STATE_STOPPED:
625+ TS_Hardware_Scan_Mode();
626+ break;
627+
628+ /*
629+ * Get the Z1 value for pressure measurement and set up
630+ * the switch register for getting the Z2 measurement.
631+ */
632+ case TS_STATE_Z1:
633+ Set_Timer2_uSec(EP93XX_TS_ADC_DELAY_USEC);
634+ sTouch.uiZ1 = ADCGetData(2, 200);
635+ ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ2);
636+ sTouch.state = TS_STATE_Z2;
637+ break;
638+
639+ /*
640+ * Get the Z2 value for pressure measurement and set up
641+ * the switch register for getting the Y measurement.
642+ */
643+ case TS_STATE_Z2:
644+ sTouch.uiZ2 = ADCGetData(2, 200);
645+ ep93xx_ts_set_direct(sSwitchSettings.uiYSample);
646+ sTouch.state = TS_STATE_Y;
647+ break;
648+
649+ /*
650+ * Get the Y value and set up the switch register for
651+ * getting the X measurement.
652+ */
653+ case TS_STATE_Y:
654+ sTouch.uiY = ADCGetData(4, 20);
655+ ep93xx_ts_set_direct(sSwitchSettings.uiXSample);
656+ sTouch.state = TS_STATE_X;
657+ break;
658+
659+ /*
660+ * Read the X value. This is the last of the 4 adc values
661+ * we need so we continue on to process the data.
662+ */
663+ case TS_STATE_X:
664+ Stop_Timer2();
665+
666+ sTouch.uiX = ADCGetData(4, 20);
667+
668+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
669+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
670+
671+ sTouch.state = TS_STATE_DONE;
672+
673+ /*
674+ * Process this set of ADC readings.
675+ */
676+ ProcessPointData();
677+
678+ break;
679+
680+ /*
681+ * Shouldn't get here. But if we do, we can recover...
682+ */
683+ case TS_STATE_DONE:
684+ TS_Hardware_Scan_Mode();
685+ break;
686+ }
687+
688+ /*
689+ * Clear the timer2 interrupt.
690+ */
691+ __raw_writel(1, EP93XX_TIMER2_CLEAR);
692+ return(IRQ_HANDLED);
693+}
694+
695+/*---------------------------------------------------------------------
696+ * ProcessPointData
697+ *
698+ * This routine processes the ADC data into usable point data and then
699+ * puts the driver into hw or sw scanning mode before returning.
700+ *
701+ * We calculate inverse pressure (lower number = more pressure) then
702+ * do a hystheresis with the two pressure values 'light' and 'heavy'.
703+ *
704+ * If we are above the light, we have pen up.
705+ * If we are below the heavy we have pen down.
706+ * As long as the pressure stays below the light, pen stays down.
707+ * When we get above the light again, pen goes back up.
708+ *
709+ */
710+static void ProcessPointData(void)
711+{
712+ int bValidPoint = 0;
713+ unsigned int uiXDiff, uiYDiff, uiInvPressureDiff;
714+ unsigned int uiInvPressure;
715+
716+ /*
717+ * Calculate the current pressure.
718+ */
719+ uiInvPressure = CalculateInvPressure();
720+
721+ /*
722+ * If pen pressure is so light that it is greater than the 'max' setting
723+ * then we consider this to be a pen up.
724+ */
725+ if (uiInvPressure >= TS_LIGHT_INV_PRESSURE)
726+ {
727+ bCurrentPenDown = 0;
728+ ee93xx_ts_evt_add(0, guiLastX, guiLastY, 0);
729+ TS_Hardware_Scan_Mode();
730+ return;
731+ }
732+
733+ /*
734+ * Hysteresis:
735+ * If the pen pressure is hard enough to be less than the 'min' OR
736+ * the pen is already down and is still less than the 'max'...
737+ */
738+ if ((uiInvPressure < TS_HEAVY_INV_PRESSURE) ||
739+ (bCurrentPenDown && (uiInvPressure < TS_LIGHT_INV_PRESSURE)))
740+ {
741+ if (bCurrentPenDown)
742+ {
743+ /*
744+ * If pen was previously down, check the difference between
745+ * the last sample and this one... if the difference between
746+ * samples is too great, ignore the sample.
747+ */
748+ uiXDiff = abs(guiLastX - sTouch.uiX);
749+ uiYDiff = abs(guiLastY - sTouch.uiY);
750+ uiInvPressureDiff = abs(guiLastInvPressure - uiInvPressure);
751+
752+ if (uiXDiff < TS_MAX_VALID_XY_CHANGE
753+ && uiYDiff < TS_MAX_VALID_XY_CHANGE
754+ && uiInvPressureDiff < TS_MAX_VALID_PRESSURE_CHANGE)
755+ {
756+ bValidPoint = 1;
757+ }
758+ }
759+ else
760+ {
761+ bValidPoint = 1;
762+ }
763+
764+ /*
765+ * If either the pen was put down or dragged make a note of it.
766+ */
767+ if (bValidPoint)
768+ {
769+ guiLastX = sTouch.uiX;
770+ guiLastY = sTouch.uiY;
771+ guiLastInvPressure = uiInvPressure;
772+ bCurrentPenDown = 1;
773+ ee93xx_ts_evt_add(1, sTouch.uiX, sTouch.uiY,
774+ 0x7000000 / uiInvPressure);
775+ }
776+
777+ TS_Soft_Scan_Mode();
778+ return;
779+ }
780+
781+ TS_Hardware_Scan_Mode();
782+}
783+
784+static void ep93xx_ts_set_direct(unsigned int uiADCSwitch)
785+{
786+ unsigned int uiResult;
787+
788+ /*
789+ * Set the switch settings in the direct register.
790+ */
791+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
792+ __raw_writel(uiADCSwitch, EP93XX_TOUCHSCREEN_DIRECT);
793+
794+ /*
795+ * Read and throw away the first sample.
796+ */
797+ do {
798+ uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
799+ } while (!(uiResult & TSXYRESULT_SDR));
800+
801+}
802+
803+static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff)
804+{
805+ unsigned int uiResult, uiValue, uiCount, uiLowest, uiHighest, uiSum, uiAve;
806+
807+ do
808+ {
809+ /*
810+ * Initialize our values.
811+ */
812+ uiLowest = 0xfffffff;
813+ uiHighest = 0;
814+ uiSum = 0;
815+
816+ for (uiCount = 0; uiCount < uiSamples; uiCount++)
817+ {
818+ /*
819+ * Read the touch screen four more times and average.
820+ */
821+ do {
822+ uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
823+ } while (!(uiResult & TSXYRESULT_SDR));
824+
825+ uiValue = (uiResult & TSXYRESULT_AD_MASK) >> TSXYRESULT_AD_SHIFT;
826+ uiValue = ((uiValue >> 4) + ((1 + TSXYRESULT_X_MASK)>>1)) & TSXYRESULT_X_MASK;
827+
828+ /*
829+ * Add up the values.
830+ */
831+ uiSum += uiValue;
832+
833+ /*
834+ * Get the lowest and highest values.
835+ */
836+ if (uiValue < uiLowest)
837+ {
838+ uiLowest = uiValue;
839+ }
840+ if (uiValue > uiHighest)
841+ {
842+ uiHighest = uiValue;
843+ }
844+ }
845+ } while ((uiHighest - uiLowest) > uiMaxDiff);
846+
847+ /*
848+ * Calculate the Average value.
849+ */
850+ uiAve = uiSum / uiSamples;
851+
852+ return uiAve;
853+}
854+
855+/*
856+ * CalculateInvPressure
857+ *
858+ * Is the Touch Valid. Touch is not valid if the X or Y value is not
859+ * in range and the pressure is not enough.
860+ *
861+ * Touch resistance can be measured by the following formula:
862+ *
863+ * Rx * X * Z2
864+ * Rtouch = --------- * (-- - 1)
865+ * 4096 Z1
866+ *
867+ * This is simplified in the ration of Rtouch to Rx. The lower the value, the
868+ * higher the pressure.
869+ *
870+ * Z2
871+ * InvPressure = X * (-- - 1)
872+ * Z1
873+ */
874+static unsigned int CalculateInvPressure(void)
875+{
876+ unsigned int uiInvPressure;
877+
878+ /*
879+ * Check to see if the point is valid.
880+ */
881+ if (sTouch.uiZ1 < MIN_Z1_VALUE)
882+ {
883+ uiInvPressure = 0x10000;
884+ }
885+
886+ /*
887+ * Can omit the pressure calculation if you need to get rid of the division.
888+ */
889+ else
890+ {
891+ uiInvPressure = ((sTouch.uiX * sTouch.uiZ2) / sTouch.uiZ1) - sTouch.uiX;
892+ }
893+
894+ return uiInvPressure;
895+}
896+
897+/*
898+ * TS_Hardware_Scan_Mode
899+ *
900+ * Enables the ep93xx ts scanning engine so that when the pen goes down
901+ * we will get an interrupt.
902+ */
903+static void TS_Hardware_Scan_Mode(void)
904+{
905+ unsigned int uiDevCfg;
906+
907+ /*
908+ * Disable the soft scanning engine.
909+ */
910+ sTouch.state = TS_STATE_STOPPED;
911+ Stop_Timer2();
912+
913+ /*
914+ * Clear the TIN (Touchscreen INactive) bit so we can go to
915+ * automatic scanning mode.
916+ */
917+ uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
918+ ep93xx_syscon_swlocked_write(uiDevCfg & ~EP93XX_SYSCON_DEVCFG_TIN,
919+ EP93XX_SYSCON_DEVCFG);
920+
921+ /*
922+ * Enable the touch screen scanning state machine by setting
923+ * the ENABLE bit.
924+ */
925+ __raw_writel(TSSETUP_DEFAULT | TSSETUP_ENABLE, EP93XX_TOUCHSCREEN_SETUP);
926+
927+ /*
928+ * Set the flag to show that we are in interrupt mode.
929+ */
930+ gScanningMode = TS_MODE_HARDWARE_SCAN;
931+
932+ /*
933+ * Initialize EP93XX_TOUCHSCREEN_SETUP2 register.
934+ */
935+ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
936+
937+}
938+
939+/*
940+ * TS_Soft_Scan_Mode
941+ *
942+ * Sets the touch screen to manual polling mode.
943+ */
944+static void TS_Soft_Scan_Mode(void)
945+{
946+ unsigned int uiDevCfg;
947+
948+ if (gScanningMode != TS_MODE_SOFT_SCAN)
949+ {
950+ /*
951+ * Disable the touch screen scanning state machine by clearing
952+ * the ENABLE bit.
953+ */
954+ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
955+
956+ /*
957+ * Set the TIN bit so we can do manual touchscreen polling.
958+ */
959+ uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
960+ ep93xx_syscon_swlocked_write(uiDevCfg | EP93XX_SYSCON_DEVCFG_TIN,
961+ EP93XX_SYSCON_DEVCFG);
962+ }
963+
964+ /*
965+ * Set the switch register up for the first ADC reading
966+ */
967+ ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ1);
968+
969+ /*
970+ * Initialize our software state machine to know which ADC
971+ * reading to take
972+ */
973+ sTouch.state = TS_STATE_Z1;
974+
975+ /*
976+ * Set the timer so after a mSec or two settling delay it will
977+ * take the first ADC reading.
978+ */
979+ Set_Timer2_uSec(EP93XX_TS_PER_POINT_DELAY_USEC);
980+
981+ /*
982+ * Note that we are in sw scanning mode not hw scanning mode.
983+ */
984+ gScanningMode = TS_MODE_SOFT_SCAN;
985+
986+}
987+
988+static void Set_Timer2_uSec(unsigned int uiDelay_uSec)
989+{
990+ unsigned int uiClockTicks;
991+
992+ /*
993+ * Stop timer 2
994+ */
995+ __raw_writel(0, EP93XX_TIMER2_CONTROL);
996+
997+ uiClockTicks = ((uiDelay_uSec * 508) + 999) / 1000;
998+ __raw_writel(uiClockTicks, EP93XX_TIMER2_LOAD);
999+ __raw_writel(uiClockTicks, EP93XX_TIMER2_VALUE);
1000+
1001+ /*
1002+ * Set up Timer 2 for 508 kHz clock and periodic mode.
1003+ */
1004+ __raw_writel(0xC8, EP93XX_TIMER2_CONTROL);
1005+
1006+}
1007+
1008+static void Stop_Timer2(void)
1009+{
1010+ __raw_writel(0, EP93XX_TIMER2_CONTROL);
1011+}
1012+
1013+/*
1014+ * Initialization and exit routines
1015+ */
1016+int __init ep93xx_ts_init(void)
1017+{
1018+ int retval;
1019+
1020+ retval = request_irq(IRQ_EP93XX_TOUCH, ep93xx_ts_isr,
1021+ IRQF_DISABLED, "ep93xx_ts", 0);
1022+ if (retval)
1023+ {
1024+ printk(KERN_WARNING "ep93xx_ts: failed to get touchscreen IRQ\n");
1025+ return retval;
1026+ }
1027+
1028+ retval = request_irq(IRQ_EP93XX_TIMER2, ep93xx_timer2_isr,
1029+ IRQF_DISABLED, "ep93xx_timer2", 0);
1030+ if (retval)
1031+ {
1032+ printk(KERN_WARNING "ep93xx_ts: failed to get timer2 IRQ\n");
1033+ free_irq(IRQ_EP93XX_TOUCH, 0);
1034+ return retval;
1035+ }
1036+
1037+ misc_register(&ep93xx_ts_miscdev);
1038+
1039+ sTouch.state = TS_STATE_STOPPED;
1040+ gScanningMode = TS_MODE_UN_INITIALIZED;
1041+
1042+ printk(KERN_NOTICE "ep93xx touchscreen driver configured for 4-wire operation\n");
1043+
1044+ return 0;
1045+}
1046+
1047+void __exit ep93xx_ts_exit(void)
1048+{
1049+ Stop_Timer2();
1050+
1051+ free_irq(IRQ_EP93XX_TOUCH, 0);
1052+ free_irq(IRQ_EP93XX_TIMER2, 0);
1053+
1054+ misc_deregister(&ep93xx_ts_miscdev);
1055+}
1056+
1057+module_init(ep93xx_ts_init);
1058+module_exit(ep93xx_ts_exit);
1059+
1060+MODULE_DESCRIPTION("Cirrus EP93xx touchscreen driver");
1061+MODULE_SUPPORTED_DEVICE("touchscreen/ep93xx");
1062+MODULE_LICENSE("GPL");
1063--- a/arch/arm/mach-ep93xx/core.c
1064+++ b/arch/arm/mach-ep93xx/core.c
1065@@ -205,6 +205,7 @@ void ep93xx_syscon_swlocked_write(unsign
1066 
1067     spin_unlock_irqrestore(&syscon_swlock, flags);
1068 }
1069+EXPORT_SYMBOL(ep93xx_syscon_swlocked_write);
1070 
1071 void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
1072 {
1073

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