Root/target/linux/ep93xx/patches-3.2/003-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@@ -177,6 +177,15 @@ config TOUCHSCREEN_EETI
13       To compile this driver as a module, choose M here: the
14       module will be called eeti_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@@ -23,6 +23,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += h
31 obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
32 obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
33 obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
34+obj-$(CONFIG_TOUCHSCREEN_EP93XX) += ep93xx_ts.o
35 obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
36 obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
37 obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
38--- /dev/null
39+++ b/drivers/input/touchscreen/ep93xx_ts.c
40@@ -0,0 +1,1021 @@
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+
70+/* This stuff should be in ep93xx-regs.h */
71+#define EP93XX_TOUCHSCREEN_REG(x) (EP93XX_TOUCHSCREEN_BASE + (x))
72+/* R/W touchscreen controller setup control register. */
73+#define EP93XX_TOUCHSCREEN_SETUP EP93XX_TOUCHSCREEN_REG(0x00)
74+/* R/W touchscreen controller max/min register. */
75+#define EP93XX_TOUCHSCREEN_XYMAXMIN EP93XX_TOUCHSCREEN_REG(0x04)
76+/* R touchscreen controller result register. */
77+#define EP93XX_TOUCHSCREEN_XYRESULT EP93XX_TOUCHSCREEN_REG(0x08)
78+/* LOCKED R/W touchscreen Switch Matrix control register. */
79+#define EP93XX_TOUCHSCREEN_DISCHARGE EP93XX_TOUCHSCREEN_REG(0x0C)
80+#define EP93XX_TOUCHSCREEN_XSAMPLE EP93XX_TOUCHSCREEN_REG(0x10)
81+#define EP93XX_TOUCHSCREEN_YSAMPLE EP93XX_TOUCHSCREEN_REG(0x14)
82+#define EP93XX_TOUCHSCREEN_DIRECT EP93XX_TOUCHSCREEN_REG(0x18)
83+#define EP93XX_TOUCHSCREEN_DETECT EP93XX_TOUCHSCREEN_REG(0x1C)
84+/* NA R/W touchscreen software lock register. */
85+#define EP93XX_TOUCHSCREEN_SWLOCK EP93XX_TOUCHSCREEN_REG(0x20)
86+/* R/W touchscreen setup control register #2. */
87+#define EP93XX_TOUCHSCREEN_SETUP2 EP93XX_TOUCHSCREEN_REG(0x24)
88+
89+/* These are duplicated in mach-ep93xx/core.c */
90+#define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x))
91+#define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20)
92+#define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24)
93+#define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28)
94+#define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c)
95+
96+/*
97+ * Register bit definitions
98+ */
99+#define TSSETUP_SDLY_MASK 0x000003FF
100+#define TSSETUP_SDLY_SHIFT 0
101+#define TSSETUP_NSMP_4 0x00000000
102+#define TSSETUP_NSMP_8 0x00000400
103+#define TSSETUP_NSMP_16 0x00000800
104+#define TSSETUP_NSMP_32 0x00000C00
105+#define TSSETUP_NSMP_MASK 0x00000C00
106+#define TSSETUP_DEV_4 0x00000000
107+#define TSSETUP_DEV_8 0x00001000
108+#define TSSETUP_DEV_12 0x00002000
109+#define TSSETUP_DEV_16 0x00003000
110+#define TSSETUP_DEV_24 0x00004000
111+#define TSSETUP_DEV_32 0x00005000
112+#define TSSETUP_DEV_64 0x00006000
113+#define TSSETUP_DEV_128 0x00007000
114+#define TSSETUP_ENABLE 0x00008000
115+#define TSSETUP_DLY_MASK 0x03FF0000
116+#define TSSETUP_DLY_SHIFT 16
117+#define TSSETUP_TDTCT 0x80000000
118+
119+#define TSMAXMIN_XMIN_MASK 0x000000FF
120+#define TSMAXMIN_XMIN_SHIFT 0
121+#define TSMAXMIN_YMIN_MASK 0x0000FF00
122+#define TSMAXMIN_YMIN_SHIFT 8
123+#define TSMAXMIN_XMAX_MASK 0x00FF0000
124+#define TSMAXMIN_XMAX_SHIFT 16
125+#define TSMAXMIN_YMAX_MASK 0xFF000000
126+#define TSMAXMIN_YMAX_SHIFT 24
127+
128+#define TSXYRESULT_X_MASK 0x00000FFF
129+#define TSXYRESULT_X_SHIFT 0
130+#define TSXYRESULT_AD_MASK 0x0000FFFF
131+#define TSXYRESULT_AD_SHIFT 0
132+#define TSXYRESULT_Y_MASK 0x0FFF0000
133+#define TSXYRESULT_Y_SHIFT 16
134+#define TSXYRESULT_SDR 0x80000000
135+
136+#define TSX_SAMPLE_MASK 0x00003FFF
137+#define TSX_SAMPLE_SHIFT 0x00
138+#define TSY_SAMPLE_MASK 0x3FFF0000
139+#define TSY_SAMPLE_SHIFT 0x10
140+
141+#define TSSETUP2_TINT 0x00000001
142+#define TSSETUP2_NICOR 0x00000002
143+#define TSSETUP2_PINT 0x00000004
144+#define TSSETUP2_PENSTS 0x00000008
145+#define TSSETUP2_PINTEN 0x00000010
146+#define TSSETUP2_DEVINT 0x00000020
147+#define TSSETUP2_DINTEN 0x00000040
148+#define TSSETUP2_DTMEN 0x00000080
149+#define TSSETUP2_DISDEV 0x00000100
150+#define TSSETUP2_NSIGND 0x00000200
151+#define TSSETUP2_S28EN 0x00000400
152+#define TSSETUP2_RINTEN 0x00000800
153+
154+#define TSXYRESULT_SDR 0x80000000
155+
156+/*
157+ * These are used as trigger levels to know when we have pen up/down.
158+ * The rules:
159+ * 1. TS_HEAVY_INV_PRESSURE < TS_LIGHT_INV_PRESSURE because these
160+ * are Inverse pressure.
161+ * 2. Any touch lighter than TS_LIGHT_INV_PRESSURE is a pen up.
162+ * 3. Any touch heavier than TS_HEAVY_INV_PRESSURE is a pen down.
163+ */
164+#define TS_HEAVY_INV_PRESSURE 0xFE0 /* C00 */
165+#define TS_LIGHT_INV_PRESSURE 0xFFF /* e00 */
166+
167+/*
168+ * If the x, y, or inverse pressure changes more than these values
169+ * between two succeeding points, the point is not reported.
170+ */
171+#define TS_MAX_VALID_XY_CHANGE 0x300
172+#define TS_MAX_VALID_PRESSURE_CHANGE 0x100
173+
174+/*
175+ * This is the minimum Z1 Value that is valid.
176+ */
177+#define MIN_Z1_VALUE 0x50
178+
179+/*
180+ * Settling delay for taking each ADC measurement. Increase this
181+ * if ts is jittery.
182+ */
183+#define EP93XX_TS_ADC_DELAY_USEC 2000
184+
185+/*
186+ * Delay between TS points.
187+ */
188+#define EP93XX_TS_PER_POINT_DELAY_USEC 10000
189+
190+/*
191+ * A few more macros...
192+ */
193+#define TSSETUP_DEFAULT (TSSETUP_NSMP_32 | TSSETUP_DEV_64 | \
194+ ((128<<TSSETUP_SDLY_SHIFT) & TSSETUP_SDLY_MASK) | \
195+ ((128<<TSSETUP_DLY_SHIFT) & TSSETUP_DLY_MASK))
196+
197+#define TSSETUP2_DEFAULT (TSSETUP2_NSIGND)
198+
199+/*
200+ * For now, we use one of the minor numbers from the local/experimental
201+ * range.
202+ */
203+#define EP93XX_TS_MINOR 240
204+
205+/*
206+ * Static Declarations
207+ */
208+static unsigned int guiLastX, guiLastY;
209+static unsigned int guiLastInvPressure;
210+
211+struct TouchScreenSample
212+{
213+ int currentX;
214+ int currentY;
215+ int currentButton;
216+ int currentPressure;
217+ struct timeval currentTime;
218+};
219+
220+/*
221+ * This must match the structure in tslib.
222+ */
223+struct ts_sample {
224+ int x;
225+ int y;
226+ unsigned int pressure;
227+ struct timeval tv;
228+};
229+
230+static struct TouchScreenSample gSample;
231+static int bFreshTouchData;
232+static int bCurrentPenDown;
233+
234+static DECLARE_WAIT_QUEUE_HEAD(queue);
235+static DEFINE_SEMAPHORE(open_sem);
236+static DEFINE_SPINLOCK(event_buffer_lock);
237+static struct fasync_struct *ep93xx_fasync;
238+
239+/*
240+ * Typedef Declarations
241+ */
242+typedef enum {
243+ TS_MODE_UN_INITIALIZED,
244+ TS_MODE_HARDWARE_SCAN,
245+ TS_MODE_SOFT_SCAN
246+} ts_mode_t;
247+
248+static ts_mode_t gScanningMode;
249+
250+typedef enum{
251+ TS_STATE_STOPPED = 0,
252+ TS_STATE_Z1,
253+ TS_STATE_Z2,
254+ TS_STATE_Y,
255+ TS_STATE_X,
256+ TS_STATE_DONE
257+} ts_states_t;
258+
259+typedef struct
260+{
261+ unsigned int uiX;
262+ unsigned int uiY;
263+ unsigned int uiZ1;
264+ unsigned int uiZ2;
265+ ts_states_t state;
266+} ts_struct_t;
267+
268+static ts_struct_t sTouch;
269+
270+/*
271+ * From the spec, here's how to set up the touch screen's switch registers.
272+ */
273+typedef struct
274+{
275+ unsigned int uiDetect;
276+ unsigned int uiDischarge;
277+ unsigned int uiXSample;
278+ unsigned int uiYSample;
279+ unsigned int uiSwitchZ1;
280+ unsigned int uiSwitchZ2;
281+}SwitchStructType;
282+
283+/*
284+ * Here's the switch settings for a 4-wire touchscreen. See the spec
285+ * for how to handle a 4, 7, or 8-wire.
286+ */
287+const static SwitchStructType sSwitchSettings =
288+/* s28en=0 */
289+/* TSDetect TSDischarge TSXSample TSYSample SwitchZ1 SwitchZ2 */
290+ {0x00403604, 0x0007fe04, 0x00081604, 0x00104601, 0x00101601, 0x00101608};
291+
292+/*
293+ * Function declarations
294+ */
295+static void ep93xx_ts_set_direct(unsigned int uiADCSwitch);
296+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id);
297+static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id);
298+static void ee93xx_ts_evt_add(int button, int dX, int dY, int Pressure);
299+static ssize_t ep93xx_ts_read(struct file *filp, char *buf,
300+ size_t count, loff_t *l);
301+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait);
302+static int ep93xx_ts_open(struct inode *inode, struct file *filp);
303+static int ep93xx_ts_fasync(int fd, struct file *filp, int on);
304+static int ep93xx_ts_release(struct inode *inode, struct file *filp);
305+static ssize_t ep93xx_ts_write(struct file *file, const char *buffer,
306+ size_t count, loff_t *ppos);
307+static void ep93xx_ts_setup(void);
308+static void ep93xx_ts_shutdown(void);
309+int __init ep93xx_ts_init(void);
310+void __exit ep93xx_ts_exit(void);
311+static unsigned int CalculateInvPressure(void);
312+static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff);
313+static void TS_Soft_Scan_Mode(void);
314+static void TS_Hardware_Scan_Mode(void);
315+static void ProcessPointData(void);
316+static void Set_Timer2_uSec(unsigned int Delay_mSec);
317+static void Stop_Timer2(void);
318+
319+/*
320+ * ep93xx_ts_isr
321+ */
322+static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
323+{
324+ /*
325+ * Note that we don't clear the interrupt here. The interrupt
326+ * gets cleared in TS_Soft_Scan_Mode when the TS ENABLE
327+ * bit is cleared.
328+ */
329+
330+ /*
331+ * Set the ts to manual polling mode and schedule a callback.
332+ * That way we can return from the isr in a reasonable amount of
333+ * time and process the touch in the callback after a brief delay.
334+ */
335+ TS_Soft_Scan_Mode();
336+
337+ return(IRQ_HANDLED);
338+}
339+
340+/*
341+ * Save the current ts 'event' in an atomic fashion.
342+ */
343+static void ee93xx_ts_evt_add(int buttons, int iX, int iY, int iPressure)
344+{
345+ /*
346+ * Note the event, but use spinlocks to keep it from getting
347+ * halfway read if we get interrupted.
348+ */
349+
350+ spin_lock(&event_buffer_lock);
351+
352+ gSample.currentX = iX;
353+ gSample.currentY = iY;
354+ gSample.currentButton = buttons;
355+ gSample.currentPressure = iPressure;
356+ bFreshTouchData = 1;
357+ do_gettimeofday(&gSample.currentTime);
358+
359+ spin_unlock(&event_buffer_lock);
360+
361+ kill_fasync(&ep93xx_fasync, SIGIO, POLL_IN);
362+ wake_up_interruptible(&queue);
363+}
364+
365+
366+static ssize_t ep93xx_ts_read(struct file *filp, char *buf, size_t count, loff_t *l)
367+{
368+ unsigned short data[3];
369+ struct ts_sample ts_data;
370+ int iReturn = -EFAULT;
371+
372+ if (!bFreshTouchData)
373+ {
374+ iReturn = 0;
375+ }
376+ else if (count == sizeof(data))
377+ {
378+ spin_lock_irq(&event_buffer_lock);
379+ bFreshTouchData = 0;
380+ data[0] = gSample.currentX;
381+ data[1] = gSample.currentY;
382+ data[2] = gSample.currentButton;
383+
384+ spin_unlock_irq(&event_buffer_lock);
385+
386+ if (copy_to_user(buf, data, sizeof data))
387+ return -EFAULT;
388+
389+ count -= sizeof(data);
390+
391+ /* return the # of bytes that got read */
392+ iReturn = sizeof(data) ;
393+ }
394+ else if (count == sizeof(struct ts_sample) )
395+ {
396+ spin_lock_irq(&event_buffer_lock);
397+ bFreshTouchData = 0;
398+ ts_data.x = gSample.currentX;
399+ ts_data.y = gSample.currentY;
400+ ts_data.pressure = gSample.currentPressure;
401+ ts_data.tv = gSample.currentTime;
402+ spin_unlock_irq(&event_buffer_lock);
403+
404+ if (copy_to_user(buf, &ts_data, sizeof(struct ts_sample)))
405+ {
406+ iReturn = -EFAULT;
407+ }
408+ else
409+ {
410+ count -= sizeof(ts_data);
411+ iReturn = sizeof(ts_data);
412+ }
413+ }
414+
415+ return iReturn;
416+}
417+
418+static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait)
419+{
420+ poll_wait(filp, &queue, wait);
421+
422+ if (bFreshTouchData)
423+ {
424+ return POLLIN | POLLRDNORM;
425+ }
426+
427+ return 0;
428+}
429+
430+static int ep93xx_ts_open(struct inode *inode, struct file *filp)
431+{
432+ if (down_trylock(&open_sem))
433+ {
434+ return -EBUSY;
435+ }
436+
437+ ep93xx_ts_setup();
438+
439+ return 0;
440+}
441+
442+/*
443+ * Asynchronous I/O support.
444+ */
445+static int ep93xx_ts_fasync(int fd, struct file *filp, int on)
446+{
447+ int retval;
448+
449+ retval = fasync_helper(fd, filp, on, &ep93xx_fasync);
450+ if (retval < 0)
451+ {
452+ return retval;
453+ }
454+
455+ return 0;
456+}
457+
458+static int ep93xx_ts_release(struct inode *inode, struct file *filp)
459+{
460+ Stop_Timer2();
461+
462+ /*
463+ * Call our async I/O support to request that this file
464+ * cease to be used for async I/O.
465+ */
466+ ep93xx_ts_fasync(-1, filp, 0);
467+
468+ ep93xx_ts_shutdown();
469+
470+ up(&open_sem);
471+
472+ return 0;
473+}
474+
475+static ssize_t ep93xx_ts_write(struct file *file, const char *buffer, size_t count,
476+ loff_t *ppos)
477+{
478+ return -EINVAL;
479+}
480+
481+
482+static int ep93xx_ts_ioctl(struct inode *inode, struct file *file, uint command, ulong u)
483+{
484+ static const int version = EV_VERSION;
485+ static const u_int32_t bit =(1 << EV_ABS);
486+ static const u_int32_t absbit = (1 << ABS_X) | (1 << ABS_Y) | (1 << ABS_PRESSURE);
487+ int iReturn ;
488+ int i = 0;
489+
490+ switch(command)
491+ {
492+ case EVIOCGVERSION:
493+ i = copy_to_user((void __user *)u, (void *)version, sizeof(version));
494+ iReturn = i ? -EFAULT : 0;
495+ break;
496+
497+ case EVIOCGBIT(0,sizeof(u_int32_t) * 8) :
498+ i = copy_to_user((void __user *)u, (void *)bit, sizeof(bit));
499+ iReturn = i ? -EFAULT : 0;
500+ break;
501+
502+ case EVIOCGBIT(EV_ABS, sizeof(absbit) * 8):
503+ i = copy_to_user((void __user *)u, (void *)absbit, sizeof(absbit));
504+ iReturn = i ? -EFAULT : 0;
505+ break;
506+ default:
507+ iReturn = -1;
508+ break;
509+ }
510+
511+ return iReturn;
512+}
513+
514+static struct file_operations ep93xx_ts_fops = {
515+ owner: THIS_MODULE,
516+ read: ep93xx_ts_read,
517+ write: ep93xx_ts_write,
518+ poll: ep93xx_ts_poll,
519+ open: ep93xx_ts_open,
520+ unlocked_ioctl: ep93xx_ts_ioctl,
521+ release: ep93xx_ts_release,
522+ fasync: ep93xx_ts_fasync,
523+};
524+
525+static struct miscdevice ep93xx_ts_miscdev =
526+{
527+ EP93XX_TS_MINOR,
528+ "ep93xx_ts",
529+ &ep93xx_ts_fops
530+};
531+
532+void ep93xx_ts_setup(void)
533+{
534+ unsigned int uiKTDIV, uiTSXYMaxMin;
535+
536+ /*
537+ * Set the TSEN bit in KTDIV so that we are enabling the clock
538+ * for the touchscreen.
539+ */
540+ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
541+ uiKTDIV |= EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
542+ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
543+
544+ /*
545+ * Program the EP93XX_TOUCHSCREEN_SETUP and TSSetup2 registers.
546+ */
547+ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
548+ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
549+
550+ /*
551+ * Set the the touch settings.
552+ */
553+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
554+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
555+
556+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
557+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DISCHARGE);
558+
559+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
560+ __raw_writel(sSwitchSettings.uiSwitchZ1, EP93XX_TOUCHSCREEN_XSAMPLE);
561+
562+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
563+ __raw_writel(sSwitchSettings.uiSwitchZ2, EP93XX_TOUCHSCREEN_YSAMPLE);
564+
565+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
566+ __raw_writel(sSwitchSettings.uiDetect, EP93XX_TOUCHSCREEN_DETECT);
567+
568+ /*
569+ * X,YMin set to 0x40 = have to drag that many pixels for a new irq.
570+ * X,YMax set to 0x40 = 1024 pixels is the maximum movement within the
571+ * time scan limit.
572+ */
573+ uiTSXYMaxMin = (50 << TSMAXMIN_XMIN_SHIFT) & TSMAXMIN_XMIN_MASK;
574+ uiTSXYMaxMin |= (50 << TSMAXMIN_YMIN_SHIFT) & TSMAXMIN_YMIN_MASK;
575+ uiTSXYMaxMin |= (0xff << TSMAXMIN_XMAX_SHIFT) & TSMAXMIN_XMAX_MASK;
576+ uiTSXYMaxMin |= (0xff << TSMAXMIN_YMAX_SHIFT) & TSMAXMIN_YMAX_MASK;
577+ __raw_writel(uiTSXYMaxMin, EP93XX_TOUCHSCREEN_XYMAXMIN);
578+
579+ bCurrentPenDown = 0;
580+ bFreshTouchData = 0;
581+ guiLastX = 0;
582+ guiLastY = 0;
583+ guiLastInvPressure = 0xffffff;
584+
585+ /*
586+ * Enable the touch screen scanning engine.
587+ */
588+ TS_Hardware_Scan_Mode();
589+}
590+
591+/*
592+ * ep93xx_ts_shutdown
593+ *
594+ */
595+static void
596+ep93xx_ts_shutdown(void)
597+{
598+ unsigned int uiKTDIV;
599+
600+ sTouch.state = TS_STATE_STOPPED;
601+ Stop_Timer2();
602+
603+ /*
604+ * Disable the scanning engine.
605+ */
606+ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP);
607+ __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP2);
608+
609+ /*
610+ * Clear the TSEN bit in KTDIV so that we are disabling the clock
611+ * for the touchscreen.
612+ */
613+ uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
614+ uiKTDIV &= ~EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
615+ ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
616+
617+} /* ep93xx_ts_shutdown */
618+
619+static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id)
620+{
621+ switch(sTouch.state)
622+ {
623+ case TS_STATE_STOPPED:
624+ TS_Hardware_Scan_Mode();
625+ break;
626+
627+ /*
628+ * Get the Z1 value for pressure measurement and set up
629+ * the switch register for getting the Z2 measurement.
630+ */
631+ case TS_STATE_Z1:
632+ Set_Timer2_uSec(EP93XX_TS_ADC_DELAY_USEC);
633+ sTouch.uiZ1 = ADCGetData(2, 200);
634+ ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ2);
635+ sTouch.state = TS_STATE_Z2;
636+ break;
637+
638+ /*
639+ * Get the Z2 value for pressure measurement and set up
640+ * the switch register for getting the Y measurement.
641+ */
642+ case TS_STATE_Z2:
643+ sTouch.uiZ2 = ADCGetData(2, 200);
644+ ep93xx_ts_set_direct(sSwitchSettings.uiYSample);
645+ sTouch.state = TS_STATE_Y;
646+ break;
647+
648+ /*
649+ * Get the Y value and set up the switch register for
650+ * getting the X measurement.
651+ */
652+ case TS_STATE_Y:
653+ sTouch.uiY = ADCGetData(4, 20);
654+ ep93xx_ts_set_direct(sSwitchSettings.uiXSample);
655+ sTouch.state = TS_STATE_X;
656+ break;
657+
658+ /*
659+ * Read the X value. This is the last of the 4 adc values
660+ * we need so we continue on to process the data.
661+ */
662+ case TS_STATE_X:
663+ Stop_Timer2();
664+
665+ sTouch.uiX = ADCGetData(4, 20);
666+
667+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
668+ __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
669+
670+ sTouch.state = TS_STATE_DONE;
671+
672+ /*
673+ * Process this set of ADC readings.
674+ */
675+ ProcessPointData();
676+
677+ break;
678+
679+ /*
680+ * Shouldn't get here. But if we do, we can recover...
681+ */
682+ case TS_STATE_DONE:
683+ TS_Hardware_Scan_Mode();
684+ break;
685+ }
686+
687+ /*
688+ * Clear the timer2 interrupt.
689+ */
690+ __raw_writel(1, EP93XX_TIMER2_CLEAR);
691+ return(IRQ_HANDLED);
692+}
693+
694+/*---------------------------------------------------------------------
695+ * ProcessPointData
696+ *
697+ * This routine processes the ADC data into usable point data and then
698+ * puts the driver into hw or sw scanning mode before returning.
699+ *
700+ * We calculate inverse pressure (lower number = more pressure) then
701+ * do a hystheresis with the two pressure values 'light' and 'heavy'.
702+ *
703+ * If we are above the light, we have pen up.
704+ * If we are below the heavy we have pen down.
705+ * As long as the pressure stays below the light, pen stays down.
706+ * When we get above the light again, pen goes back up.
707+ *
708+ */
709+static void ProcessPointData(void)
710+{
711+ int bValidPoint = 0;
712+ unsigned int uiXDiff, uiYDiff, uiInvPressureDiff;
713+ unsigned int uiInvPressure;
714+
715+ /*
716+ * Calculate the current pressure.
717+ */
718+ uiInvPressure = CalculateInvPressure();
719+
720+ /*
721+ * If pen pressure is so light that it is greater than the 'max' setting
722+ * then we consider this to be a pen up.
723+ */
724+ if (uiInvPressure >= TS_LIGHT_INV_PRESSURE)
725+ {
726+ bCurrentPenDown = 0;
727+ ee93xx_ts_evt_add(0, guiLastX, guiLastY, 0);
728+ TS_Hardware_Scan_Mode();
729+ return;
730+ }
731+
732+ /*
733+ * Hysteresis:
734+ * If the pen pressure is hard enough to be less than the 'min' OR
735+ * the pen is already down and is still less than the 'max'...
736+ */
737+ if ((uiInvPressure < TS_HEAVY_INV_PRESSURE) ||
738+ (bCurrentPenDown && (uiInvPressure < TS_LIGHT_INV_PRESSURE)))
739+ {
740+ if (bCurrentPenDown)
741+ {
742+ /*
743+ * If pen was previously down, check the difference between
744+ * the last sample and this one... if the difference between
745+ * samples is too great, ignore the sample.
746+ */
747+ uiXDiff = abs(guiLastX - sTouch.uiX);
748+ uiYDiff = abs(guiLastY - sTouch.uiY);
749+ uiInvPressureDiff = abs(guiLastInvPressure - uiInvPressure);
750+
751+ if (uiXDiff < TS_MAX_VALID_XY_CHANGE
752+ && uiYDiff < TS_MAX_VALID_XY_CHANGE
753+ && uiInvPressureDiff < TS_MAX_VALID_PRESSURE_CHANGE)
754+ {
755+ bValidPoint = 1;
756+ }
757+ }
758+ else
759+ {
760+ bValidPoint = 1;
761+ }
762+
763+ /*
764+ * If either the pen was put down or dragged make a note of it.
765+ */
766+ if (bValidPoint)
767+ {
768+ guiLastX = sTouch.uiX;
769+ guiLastY = sTouch.uiY;
770+ guiLastInvPressure = uiInvPressure;
771+ bCurrentPenDown = 1;
772+ ee93xx_ts_evt_add(1, sTouch.uiX, sTouch.uiY,
773+ 0x7000000 / uiInvPressure);
774+ }
775+
776+ TS_Soft_Scan_Mode();
777+ return;
778+ }
779+
780+ TS_Hardware_Scan_Mode();
781+}
782+
783+static void ep93xx_ts_set_direct(unsigned int uiADCSwitch)
784+{
785+ unsigned int uiResult;
786+
787+ /*
788+ * Set the switch settings in the direct register.
789+ */
790+ __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
791+ __raw_writel(uiADCSwitch, EP93XX_TOUCHSCREEN_DIRECT);
792+
793+ /*
794+ * Read and throw away the first sample.
795+ */
796+ do {
797+ uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
798+ } while (!(uiResult & TSXYRESULT_SDR));
799+
800+}
801+
802+static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff)
803+{
804+ unsigned int uiResult, uiValue, uiCount, uiLowest, uiHighest, uiSum, uiAve;
805+
806+ do
807+ {
808+ /*
809+ * Initialize our values.
810+ */
811+ uiLowest = 0xfffffff;
812+ uiHighest = 0;
813+ uiSum = 0;
814+
815+ for (uiCount = 0; uiCount < uiSamples; uiCount++)
816+ {
817+ /*
818+ * Read the touch screen four more times and average.
819+ */
820+ do {
821+ uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
822+ } while (!(uiResult & TSXYRESULT_SDR));
823+
824+ uiValue = (uiResult & TSXYRESULT_AD_MASK) >> TSXYRESULT_AD_SHIFT;
825+ uiValue = ((uiValue >> 4) + ((1 + TSXYRESULT_X_MASK)>>1)) & TSXYRESULT_X_MASK;
826+
827+ /*
828+ * Add up the values.
829+ */
830+ uiSum += uiValue;
831+
832+ /*
833+ * Get the lowest and highest values.
834+ */
835+ if (uiValue < uiLowest)
836+ {
837+ uiLowest = uiValue;
838+ }
839+ if (uiValue > uiHighest)
840+ {
841+ uiHighest = uiValue;
842+ }
843+ }
844+ } while ((uiHighest - uiLowest) > uiMaxDiff);
845+
846+ /*
847+ * Calculate the Average value.
848+ */
849+ uiAve = uiSum / uiSamples;
850+
851+ return uiAve;
852+}
853+
854+/*
855+ * CalculateInvPressure
856+ *
857+ * Is the Touch Valid. Touch is not valid if the X or Y value is not
858+ * in range and the pressure is not enough.
859+ *
860+ * Touch resistance can be measured by the following formula:
861+ *
862+ * Rx * X * Z2
863+ * Rtouch = --------- * (-- - 1)
864+ * 4096 Z1
865+ *
866+ * This is simplified in the ration of Rtouch to Rx. The lower the value, the
867+ * higher the pressure.
868+ *
869+ * Z2
870+ * InvPressure = X * (-- - 1)
871+ * Z1
872+ */
873+static unsigned int CalculateInvPressure(void)
874+{
875+ unsigned int uiInvPressure;
876+
877+ /*
878+ * Check to see if the point is valid.
879+ */
880+ if (sTouch.uiZ1 < MIN_Z1_VALUE)
881+ {
882+ uiInvPressure = 0x10000;
883+ }
884+
885+ /*
886+ * Can omit the pressure calculation if you need to get rid of the division.
887+ */
888+ else
889+ {
890+ uiInvPressure = ((sTouch.uiX * sTouch.uiZ2) / sTouch.uiZ1) - sTouch.uiX;
891+ }
892+
893+ return uiInvPressure;
894+}
895+
896+/*
897+ * TS_Hardware_Scan_Mode
898+ *
899+ * Enables the ep93xx ts scanning engine so that when the pen goes down
900+ * we will get an interrupt.
901+ */
902+static void TS_Hardware_Scan_Mode(void)
903+{
904+ unsigned int uiDevCfg;
905+
906+ /*
907+ * Disable the soft scanning engine.
908+ */
909+ sTouch.state = TS_STATE_STOPPED;
910+ Stop_Timer2();
911+
912+ /*
913+ * Clear the TIN (Touchscreen INactive) bit so we can go to
914+ * automatic scanning mode.
915+ */
916+ uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
917+ ep93xx_syscon_swlocked_write(uiDevCfg & ~EP93XX_SYSCON_DEVCFG_TIN,
918+ EP93XX_SYSCON_DEVCFG);
919+
920+ /*
921+ * Enable the touch screen scanning state machine by setting
922+ * the ENABLE bit.
923+ */
924+ __raw_writel(TSSETUP_DEFAULT | TSSETUP_ENABLE, EP93XX_TOUCHSCREEN_SETUP);
925+
926+ /*
927+ * Set the flag to show that we are in interrupt mode.
928+ */
929+ gScanningMode = TS_MODE_HARDWARE_SCAN;
930+
931+ /*
932+ * Initialize EP93XX_TOUCHSCREEN_SETUP2 register.
933+ */
934+ __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
935+
936+}
937+
938+/*
939+ * TS_Soft_Scan_Mode
940+ *
941+ * Sets the touch screen to manual polling mode.
942+ */
943+static void TS_Soft_Scan_Mode(void)
944+{
945+ unsigned int uiDevCfg;
946+
947+ if (gScanningMode != TS_MODE_SOFT_SCAN)
948+ {
949+ /*
950+ * Disable the touch screen scanning state machine by clearing
951+ * the ENABLE bit.
952+ */
953+ __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
954+
955+ /*
956+ * Set the TIN bit so we can do manual touchscreen polling.
957+ */
958+ uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
959+ ep93xx_syscon_swlocked_write(uiDevCfg | EP93XX_SYSCON_DEVCFG_TIN,
960+ EP93XX_SYSCON_DEVCFG);
961+ }
962+
963+ /*
964+ * Set the switch register up for the first ADC reading
965+ */
966+ ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ1);
967+
968+ /*
969+ * Initialize our software state machine to know which ADC
970+ * reading to take
971+ */
972+ sTouch.state = TS_STATE_Z1;
973+
974+ /*
975+ * Set the timer so after a mSec or two settling delay it will
976+ * take the first ADC reading.
977+ */
978+ Set_Timer2_uSec(EP93XX_TS_PER_POINT_DELAY_USEC);
979+
980+ /*
981+ * Note that we are in sw scanning mode not hw scanning mode.
982+ */
983+ gScanningMode = TS_MODE_SOFT_SCAN;
984+
985+}
986+
987+static void Set_Timer2_uSec(unsigned int uiDelay_uSec)
988+{
989+ unsigned int uiClockTicks;
990+
991+ /*
992+ * Stop timer 2
993+ */
994+ __raw_writel(0, EP93XX_TIMER2_CONTROL);
995+
996+ uiClockTicks = ((uiDelay_uSec * 508) + 999) / 1000;
997+ __raw_writel(uiClockTicks, EP93XX_TIMER2_LOAD);
998+ __raw_writel(uiClockTicks, EP93XX_TIMER2_VALUE);
999+
1000+ /*
1001+ * Set up Timer 2 for 508 kHz clock and periodic mode.
1002+ */
1003+ __raw_writel(0xC8, EP93XX_TIMER2_CONTROL);
1004+
1005+}
1006+
1007+static void Stop_Timer2(void)
1008+{
1009+ __raw_writel(0, EP93XX_TIMER2_CONTROL);
1010+}
1011+
1012+/*
1013+ * Initialization and exit routines
1014+ */
1015+int __init ep93xx_ts_init(void)
1016+{
1017+ int retval;
1018+
1019+ retval = request_irq(IRQ_EP93XX_TOUCH, ep93xx_ts_isr,
1020+ IRQF_DISABLED, "ep93xx_ts", 0);
1021+ if (retval)
1022+ {
1023+ printk(KERN_WARNING "ep93xx_ts: failed to get touchscreen IRQ\n");
1024+ return retval;
1025+ }
1026+
1027+ retval = request_irq(IRQ_EP93XX_TIMER2, ep93xx_timer2_isr,
1028+ IRQF_DISABLED, "ep93xx_timer2", 0);
1029+ if (retval)
1030+ {
1031+ printk(KERN_WARNING "ep93xx_ts: failed to get timer2 IRQ\n");
1032+ free_irq(IRQ_EP93XX_TOUCH, 0);
1033+ return retval;
1034+ }
1035+
1036+ misc_register(&ep93xx_ts_miscdev);
1037+
1038+ sTouch.state = TS_STATE_STOPPED;
1039+ gScanningMode = TS_MODE_UN_INITIALIZED;
1040+
1041+ printk(KERN_NOTICE "ep93xx touchscreen driver configured for 4-wire operation\n");
1042+
1043+ return 0;
1044+}
1045+
1046+void __exit ep93xx_ts_exit(void)
1047+{
1048+ Stop_Timer2();
1049+
1050+ free_irq(IRQ_EP93XX_TOUCH, 0);
1051+ free_irq(IRQ_EP93XX_TIMER2, 0);
1052+
1053+ misc_deregister(&ep93xx_ts_miscdev);
1054+}
1055+
1056+module_init(ep93xx_ts_init);
1057+module_exit(ep93xx_ts_exit);
1058+
1059+MODULE_DESCRIPTION("Cirrus EP93xx touchscreen driver");
1060+MODULE_SUPPORTED_DEVICE("touchscreen/ep93xx");
1061+MODULE_LICENSE("GPL");
1062

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