[ep93xx] fix touchscreen driver build failure
[openwrt/svn-archive/archive.git] / target / linux / ep93xx / patches-2.6.36 / 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 @@ -153,6 +153,15 @@ 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 @@ -21,6 +21,7 @@ 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_MC13783) += mc13783_ts.o
38 --- /dev/null
39 +++ b/drivers/input/touchscreen/ep93xx_ts.c
40 @@ -0,0 +1,1020 @@
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 <asm/irq.h>
66 +#include <mach/hardware.h>
67 +#include <asm/io.h>
68 +
69 +/* This stuff should be in ep93xx-regs.h */
70 +#define EP93XX_TOUCHSCREEN_REG(x) (EP93XX_TOUCHSCREEN_BASE + (x))
71 +/* R/W touchscreen controller setup control register. */
72 +#define EP93XX_TOUCHSCREEN_SETUP EP93XX_TOUCHSCREEN_REG(0x00)
73 +/* R/W touchscreen controller max/min register. */
74 +#define EP93XX_TOUCHSCREEN_XYMAXMIN EP93XX_TOUCHSCREEN_REG(0x04)
75 +/* R touchscreen controller result register. */
76 +#define EP93XX_TOUCHSCREEN_XYRESULT EP93XX_TOUCHSCREEN_REG(0x08)
77 +/* LOCKED R/W touchscreen Switch Matrix control register. */
78 +#define EP93XX_TOUCHSCREEN_DISCHARGE EP93XX_TOUCHSCREEN_REG(0x0C)
79 +#define EP93XX_TOUCHSCREEN_XSAMPLE EP93XX_TOUCHSCREEN_REG(0x10)
80 +#define EP93XX_TOUCHSCREEN_YSAMPLE EP93XX_TOUCHSCREEN_REG(0x14)
81 +#define EP93XX_TOUCHSCREEN_DIRECT EP93XX_TOUCHSCREEN_REG(0x18)
82 +#define EP93XX_TOUCHSCREEN_DETECT EP93XX_TOUCHSCREEN_REG(0x1C)
83 +/* NA R/W touchscreen software lock register. */
84 +#define EP93XX_TOUCHSCREEN_SWLOCK EP93XX_TOUCHSCREEN_REG(0x20)
85 +/* R/W touchscreen setup control register #2. */
86 +#define EP93XX_TOUCHSCREEN_SETUP2 EP93XX_TOUCHSCREEN_REG(0x24)
87 +
88 +/* These are duplicated in mach-ep93xx/core.c */
89 +#define EP93XX_TIMER_REG(x) (EP93XX_TIMER_BASE + (x))
90 +#define EP93XX_TIMER2_LOAD EP93XX_TIMER_REG(0x20)
91 +#define EP93XX_TIMER2_VALUE EP93XX_TIMER_REG(0x24)
92 +#define EP93XX_TIMER2_CONTROL EP93XX_TIMER_REG(0x28)
93 +#define EP93XX_TIMER2_CLEAR EP93XX_TIMER_REG(0x2c)
94 +
95 +/*
96 + * Register bit definitions
97 + */
98 +#define TSSETUP_SDLY_MASK 0x000003FF
99 +#define TSSETUP_SDLY_SHIFT 0
100 +#define TSSETUP_NSMP_4 0x00000000
101 +#define TSSETUP_NSMP_8 0x00000400
102 +#define TSSETUP_NSMP_16 0x00000800
103 +#define TSSETUP_NSMP_32 0x00000C00
104 +#define TSSETUP_NSMP_MASK 0x00000C00
105 +#define TSSETUP_DEV_4 0x00000000
106 +#define TSSETUP_DEV_8 0x00001000
107 +#define TSSETUP_DEV_12 0x00002000
108 +#define TSSETUP_DEV_16 0x00003000
109 +#define TSSETUP_DEV_24 0x00004000
110 +#define TSSETUP_DEV_32 0x00005000
111 +#define TSSETUP_DEV_64 0x00006000
112 +#define TSSETUP_DEV_128 0x00007000
113 +#define TSSETUP_ENABLE 0x00008000
114 +#define TSSETUP_DLY_MASK 0x03FF0000
115 +#define TSSETUP_DLY_SHIFT 16
116 +#define TSSETUP_TDTCT 0x80000000
117 +
118 +#define TSMAXMIN_XMIN_MASK 0x000000FF
119 +#define TSMAXMIN_XMIN_SHIFT 0
120 +#define TSMAXMIN_YMIN_MASK 0x0000FF00
121 +#define TSMAXMIN_YMIN_SHIFT 8
122 +#define TSMAXMIN_XMAX_MASK 0x00FF0000
123 +#define TSMAXMIN_XMAX_SHIFT 16
124 +#define TSMAXMIN_YMAX_MASK 0xFF000000
125 +#define TSMAXMIN_YMAX_SHIFT 24
126 +
127 +#define TSXYRESULT_X_MASK 0x00000FFF
128 +#define TSXYRESULT_X_SHIFT 0
129 +#define TSXYRESULT_AD_MASK 0x0000FFFF
130 +#define TSXYRESULT_AD_SHIFT 0
131 +#define TSXYRESULT_Y_MASK 0x0FFF0000
132 +#define TSXYRESULT_Y_SHIFT 16
133 +#define TSXYRESULT_SDR 0x80000000
134 +
135 +#define TSX_SAMPLE_MASK 0x00003FFF
136 +#define TSX_SAMPLE_SHIFT 0x00
137 +#define TSY_SAMPLE_MASK 0x3FFF0000
138 +#define TSY_SAMPLE_SHIFT 0x10
139 +
140 +#define TSSETUP2_TINT 0x00000001
141 +#define TSSETUP2_NICOR 0x00000002
142 +#define TSSETUP2_PINT 0x00000004
143 +#define TSSETUP2_PENSTS 0x00000008
144 +#define TSSETUP2_PINTEN 0x00000010
145 +#define TSSETUP2_DEVINT 0x00000020
146 +#define TSSETUP2_DINTEN 0x00000040
147 +#define TSSETUP2_DTMEN 0x00000080
148 +#define TSSETUP2_DISDEV 0x00000100
149 +#define TSSETUP2_NSIGND 0x00000200
150 +#define TSSETUP2_S28EN 0x00000400
151 +#define TSSETUP2_RINTEN 0x00000800
152 +
153 +#define TSXYRESULT_SDR 0x80000000
154 +
155 +/*
156 + * These are used as trigger levels to know when we have pen up/down.
157 + * The rules:
158 + * 1. TS_HEAVY_INV_PRESSURE < TS_LIGHT_INV_PRESSURE because these
159 + * are Inverse pressure.
160 + * 2. Any touch lighter than TS_LIGHT_INV_PRESSURE is a pen up.
161 + * 3. Any touch heavier than TS_HEAVY_INV_PRESSURE is a pen down.
162 + */
163 +#define TS_HEAVY_INV_PRESSURE 0xFE0 /* C00 */
164 +#define TS_LIGHT_INV_PRESSURE 0xFFF /* e00 */
165 +
166 +/*
167 + * If the x, y, or inverse pressure changes more than these values
168 + * between two succeeding points, the point is not reported.
169 + */
170 +#define TS_MAX_VALID_XY_CHANGE 0x300
171 +#define TS_MAX_VALID_PRESSURE_CHANGE 0x100
172 +
173 +/*
174 + * This is the minimum Z1 Value that is valid.
175 + */
176 +#define MIN_Z1_VALUE 0x50
177 +
178 +/*
179 + * Settling delay for taking each ADC measurement. Increase this
180 + * if ts is jittery.
181 + */
182 +#define EP93XX_TS_ADC_DELAY_USEC 2000
183 +
184 +/*
185 + * Delay between TS points.
186 + */
187 +#define EP93XX_TS_PER_POINT_DELAY_USEC 10000
188 +
189 +/*
190 + * A few more macros...
191 + */
192 +#define TSSETUP_DEFAULT (TSSETUP_NSMP_32 | TSSETUP_DEV_64 | \
193 + ((128<<TSSETUP_SDLY_SHIFT) & TSSETUP_SDLY_MASK) | \
194 + ((128<<TSSETUP_DLY_SHIFT) & TSSETUP_DLY_MASK))
195 +
196 +#define TSSETUP2_DEFAULT (TSSETUP2_NSIGND)
197 +
198 +/*
199 + * For now, we use one of the minor numbers from the local/experimental
200 + * range.
201 + */
202 +#define EP93XX_TS_MINOR 240
203 +
204 +/*
205 + * Static Declarations
206 + */
207 +static unsigned int guiLastX, guiLastY;
208 +static unsigned int guiLastInvPressure;
209 +
210 +struct TouchScreenSample
211 +{
212 + int currentX;
213 + int currentY;
214 + int currentButton;
215 + int currentPressure;
216 + struct timeval currentTime;
217 +};
218 +
219 +/*
220 + * This must match the structure in tslib.
221 + */
222 +struct ts_sample {
223 + int x;
224 + int y;
225 + unsigned int pressure;
226 + struct timeval tv;
227 +};
228 +
229 +static struct TouchScreenSample gSample;
230 +static int bFreshTouchData;
231 +static int bCurrentPenDown;
232 +
233 +static DECLARE_WAIT_QUEUE_HEAD(queue);
234 +static DECLARE_MUTEX(open_sem);
235 +static spinlock_t event_buffer_lock = SPIN_LOCK_UNLOCKED;
236 +static struct fasync_struct *ep93xx_fasync;
237 +
238 +/*
239 + * Typedef Declarations
240 + */
241 +typedef enum {
242 + TS_MODE_UN_INITIALIZED,
243 + TS_MODE_HARDWARE_SCAN,
244 + TS_MODE_SOFT_SCAN
245 +} ts_mode_t;
246 +
247 +static ts_mode_t gScanningMode;
248 +
249 +typedef enum{
250 + TS_STATE_STOPPED = 0,
251 + TS_STATE_Z1,
252 + TS_STATE_Z2,
253 + TS_STATE_Y,
254 + TS_STATE_X,
255 + TS_STATE_DONE
256 +} ts_states_t;
257 +
258 +typedef struct
259 +{
260 + unsigned int uiX;
261 + unsigned int uiY;
262 + unsigned int uiZ1;
263 + unsigned int uiZ2;
264 + ts_states_t state;
265 +} ts_struct_t;
266 +
267 +static ts_struct_t sTouch;
268 +
269 +/*
270 + * From the spec, here's how to set up the touch screen's switch registers.
271 + */
272 +typedef struct
273 +{
274 + unsigned int uiDetect;
275 + unsigned int uiDischarge;
276 + unsigned int uiXSample;
277 + unsigned int uiYSample;
278 + unsigned int uiSwitchZ1;
279 + unsigned int uiSwitchZ2;
280 +}SwitchStructType;
281 +
282 +/*
283 + * Here's the switch settings for a 4-wire touchscreen. See the spec
284 + * for how to handle a 4, 7, or 8-wire.
285 + */
286 +const static SwitchStructType sSwitchSettings =
287 +/* s28en=0 */
288 +/* TSDetect TSDischarge TSXSample TSYSample SwitchZ1 SwitchZ2 */
289 + {0x00403604, 0x0007fe04, 0x00081604, 0x00104601, 0x00101601, 0x00101608};
290 +
291 +/*
292 + * Function declarations
293 + */
294 +static void ep93xx_ts_set_direct(unsigned int uiADCSwitch);
295 +static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id);
296 +static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id);
297 +static void ee93xx_ts_evt_add(int button, int dX, int dY, int Pressure);
298 +static ssize_t ep93xx_ts_read(struct file *filp, char *buf,
299 + size_t count, loff_t *l);
300 +static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait);
301 +static int ep93xx_ts_open(struct inode *inode, struct file *filp);
302 +static int ep93xx_ts_fasync(int fd, struct file *filp, int on);
303 +static int ep93xx_ts_release(struct inode *inode, struct file *filp);
304 +static ssize_t ep93xx_ts_write(struct file *file, const char *buffer,
305 + size_t count, loff_t *ppos);
306 +static void ep93xx_ts_setup(void);
307 +static void ep93xx_ts_shutdown(void);
308 +int __init ep93xx_ts_init(void);
309 +void __exit ep93xx_ts_exit(void);
310 +static unsigned int CalculateInvPressure(void);
311 +static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff);
312 +static void TS_Soft_Scan_Mode(void);
313 +static void TS_Hardware_Scan_Mode(void);
314 +static void ProcessPointData(void);
315 +static void Set_Timer2_uSec(unsigned int Delay_mSec);
316 +static void Stop_Timer2(void);
317 +
318 +/*
319 + * ep93xx_ts_isr
320 + */
321 +static irqreturn_t ep93xx_ts_isr(int irq, void *dev_id)
322 +{
323 + /*
324 + * Note that we don't clear the interrupt here. The interrupt
325 + * gets cleared in TS_Soft_Scan_Mode when the TS ENABLE
326 + * bit is cleared.
327 + */
328 +
329 + /*
330 + * Set the ts to manual polling mode and schedule a callback.
331 + * That way we can return from the isr in a reasonable amount of
332 + * time and process the touch in the callback after a brief delay.
333 + */
334 + TS_Soft_Scan_Mode();
335 +
336 + return(IRQ_HANDLED);
337 +}
338 +
339 +/*
340 + * Save the current ts 'event' in an atomic fashion.
341 + */
342 +static void ee93xx_ts_evt_add(int buttons, int iX, int iY, int iPressure)
343 +{
344 + /*
345 + * Note the event, but use spinlocks to keep it from getting
346 + * halfway read if we get interrupted.
347 + */
348 +
349 + spin_lock(&event_buffer_lock);
350 +
351 + gSample.currentX = iX;
352 + gSample.currentY = iY;
353 + gSample.currentButton = buttons;
354 + gSample.currentPressure = iPressure;
355 + bFreshTouchData = 1;
356 + do_gettimeofday(&gSample.currentTime);
357 +
358 + spin_unlock(&event_buffer_lock);
359 +
360 + kill_fasync(&ep93xx_fasync, SIGIO, POLL_IN);
361 + wake_up_interruptible(&queue);
362 +}
363 +
364 +
365 +static ssize_t ep93xx_ts_read(struct file *filp, char *buf, size_t count, loff_t *l)
366 +{
367 + unsigned short data[3];
368 + struct ts_sample ts_data;
369 + int iReturn = -EFAULT;
370 +
371 + if (!bFreshTouchData)
372 + {
373 + iReturn = 0;
374 + }
375 + else if (count == sizeof(data))
376 + {
377 + spin_lock_irq(&event_buffer_lock);
378 + bFreshTouchData = 0;
379 + data[0] = gSample.currentX;
380 + data[1] = gSample.currentY;
381 + data[2] = gSample.currentButton;
382 +
383 + spin_unlock_irq(&event_buffer_lock);
384 +
385 + if (copy_to_user(buf, data, sizeof data))
386 + return -EFAULT;
387 +
388 + count -= sizeof(data);
389 +
390 + /* return the # of bytes that got read */
391 + iReturn = sizeof(data) ;
392 + }
393 + else if (count == sizeof(struct ts_sample) )
394 + {
395 + spin_lock_irq(&event_buffer_lock);
396 + bFreshTouchData = 0;
397 + ts_data.x = gSample.currentX;
398 + ts_data.y = gSample.currentY;
399 + ts_data.pressure = gSample.currentPressure;
400 + ts_data.tv = gSample.currentTime;
401 + spin_unlock_irq(&event_buffer_lock);
402 +
403 + if (copy_to_user(buf, &ts_data, sizeof(struct ts_sample)))
404 + {
405 + iReturn = -EFAULT;
406 + }
407 + else
408 + {
409 + count -= sizeof(ts_data);
410 + iReturn = sizeof(ts_data);
411 + }
412 + }
413 +
414 + return iReturn;
415 +}
416 +
417 +static unsigned int ep93xx_ts_poll(struct file *filp, poll_table *wait)
418 +{
419 + poll_wait(filp, &queue, wait);
420 +
421 + if (bFreshTouchData)
422 + {
423 + return POLLIN | POLLRDNORM;
424 + }
425 +
426 + return 0;
427 +}
428 +
429 +static int ep93xx_ts_open(struct inode *inode, struct file *filp)
430 +{
431 + if (down_trylock(&open_sem))
432 + {
433 + return -EBUSY;
434 + }
435 +
436 + ep93xx_ts_setup();
437 +
438 + return 0;
439 +}
440 +
441 +/*
442 + * Asynchronous I/O support.
443 + */
444 +static int ep93xx_ts_fasync(int fd, struct file *filp, int on)
445 +{
446 + int retval;
447 +
448 + retval = fasync_helper(fd, filp, on, &ep93xx_fasync);
449 + if (retval < 0)
450 + {
451 + return retval;
452 + }
453 +
454 + return 0;
455 +}
456 +
457 +static int ep93xx_ts_release(struct inode *inode, struct file *filp)
458 +{
459 + Stop_Timer2();
460 +
461 + /*
462 + * Call our async I/O support to request that this file
463 + * cease to be used for async I/O.
464 + */
465 + ep93xx_ts_fasync(-1, filp, 0);
466 +
467 + ep93xx_ts_shutdown();
468 +
469 + up(&open_sem);
470 +
471 + return 0;
472 +}
473 +
474 +static ssize_t ep93xx_ts_write(struct file *file, const char *buffer, size_t count,
475 + loff_t *ppos)
476 +{
477 + return -EINVAL;
478 +}
479 +
480 +
481 +static int ep93xx_ts_ioctl(struct inode *inode, struct file *file, uint command, ulong u)
482 +{
483 + static const int version = EV_VERSION;
484 + static const u_int32_t bit =(1 << EV_ABS);
485 + static const u_int32_t absbit = (1 << ABS_X) | (1 << ABS_Y) | (1 << ABS_PRESSURE);
486 + int iReturn ;
487 + int i = 0;
488 +
489 + switch(command)
490 + {
491 + case EVIOCGVERSION:
492 + i = copy_to_user((void __user *)u, (void *)version, sizeof(version));
493 + iReturn = i ? -EFAULT : 0;
494 + break;
495 +
496 + case EVIOCGBIT(0,sizeof(u_int32_t) * 8) :
497 + i = copy_to_user((void __user *)u, (void *)bit, sizeof(bit));
498 + iReturn = i ? -EFAULT : 0;
499 + break;
500 +
501 + case EVIOCGBIT(EV_ABS, sizeof(absbit) * 8):
502 + i = copy_to_user((void __user *)u, (void *)absbit, sizeof(absbit));
503 + iReturn = i ? -EFAULT : 0;
504 + break;
505 + default:
506 + iReturn = -1;
507 + break;
508 + }
509 +
510 + return iReturn;
511 +}
512 +
513 +static struct file_operations ep93xx_ts_fops = {
514 + owner: THIS_MODULE,
515 + read: ep93xx_ts_read,
516 + write: ep93xx_ts_write,
517 + poll: ep93xx_ts_poll,
518 + open: ep93xx_ts_open,
519 + unlocked_ioctl: ep93xx_ts_ioctl,
520 + release: ep93xx_ts_release,
521 + fasync: ep93xx_ts_fasync,
522 +};
523 +
524 +static struct miscdevice ep93xx_ts_miscdev =
525 +{
526 + EP93XX_TS_MINOR,
527 + "ep93xx_ts",
528 + &ep93xx_ts_fops
529 +};
530 +
531 +void ep93xx_ts_setup(void)
532 +{
533 + unsigned int uiKTDIV, uiTSXYMaxMin;
534 +
535 + /*
536 + * Set the TSEN bit in KTDIV so that we are enabling the clock
537 + * for the touchscreen.
538 + */
539 + uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
540 + uiKTDIV |= EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
541 + ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
542 +
543 + /*
544 + * Program the EP93XX_TOUCHSCREEN_SETUP and TSSetup2 registers.
545 + */
546 + __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
547 + __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
548 +
549 + /*
550 + * Set the the touch settings.
551 + */
552 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
553 + __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
554 +
555 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
556 + __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DISCHARGE);
557 +
558 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
559 + __raw_writel(sSwitchSettings.uiSwitchZ1, EP93XX_TOUCHSCREEN_XSAMPLE);
560 +
561 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
562 + __raw_writel(sSwitchSettings.uiSwitchZ2, EP93XX_TOUCHSCREEN_YSAMPLE);
563 +
564 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
565 + __raw_writel(sSwitchSettings.uiDetect, EP93XX_TOUCHSCREEN_DETECT);
566 +
567 + /*
568 + * X,YMin set to 0x40 = have to drag that many pixels for a new irq.
569 + * X,YMax set to 0x40 = 1024 pixels is the maximum movement within the
570 + * time scan limit.
571 + */
572 + uiTSXYMaxMin = (50 << TSMAXMIN_XMIN_SHIFT) & TSMAXMIN_XMIN_MASK;
573 + uiTSXYMaxMin |= (50 << TSMAXMIN_YMIN_SHIFT) & TSMAXMIN_YMIN_MASK;
574 + uiTSXYMaxMin |= (0xff << TSMAXMIN_XMAX_SHIFT) & TSMAXMIN_XMAX_MASK;
575 + uiTSXYMaxMin |= (0xff << TSMAXMIN_YMAX_SHIFT) & TSMAXMIN_YMAX_MASK;
576 + __raw_writel(uiTSXYMaxMin, EP93XX_TOUCHSCREEN_XYMAXMIN);
577 +
578 + bCurrentPenDown = 0;
579 + bFreshTouchData = 0;
580 + guiLastX = 0;
581 + guiLastY = 0;
582 + guiLastInvPressure = 0xffffff;
583 +
584 + /*
585 + * Enable the touch screen scanning engine.
586 + */
587 + TS_Hardware_Scan_Mode();
588 +}
589 +
590 +/*
591 + * ep93xx_ts_shutdown
592 + *
593 + */
594 +static void
595 +ep93xx_ts_shutdown(void)
596 +{
597 + unsigned int uiKTDIV;
598 +
599 + sTouch.state = TS_STATE_STOPPED;
600 + Stop_Timer2();
601 +
602 + /*
603 + * Disable the scanning engine.
604 + */
605 + __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP);
606 + __raw_writel(0, EP93XX_TOUCHSCREEN_SETUP2);
607 +
608 + /*
609 + * Clear the TSEN bit in KTDIV so that we are disabling the clock
610 + * for the touchscreen.
611 + */
612 + uiKTDIV = __raw_readl(EP93XX_SYSCON_KEYTCHCLKDIV);
613 + uiKTDIV &= ~EP93XX_SYSCON_KEYTCHCLKDIV_TSEN;
614 + ep93xx_syscon_swlocked_write(uiKTDIV, EP93XX_SYSCON_KEYTCHCLKDIV);
615 +
616 +} /* ep93xx_ts_shutdown */
617 +
618 +static irqreturn_t ep93xx_timer2_isr(int irq, void *dev_id)
619 +{
620 + switch(sTouch.state)
621 + {
622 + case TS_STATE_STOPPED:
623 + TS_Hardware_Scan_Mode();
624 + break;
625 +
626 + /*
627 + * Get the Z1 value for pressure measurement and set up
628 + * the switch register for getting the Z2 measurement.
629 + */
630 + case TS_STATE_Z1:
631 + Set_Timer2_uSec(EP93XX_TS_ADC_DELAY_USEC);
632 + sTouch.uiZ1 = ADCGetData(2, 200);
633 + ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ2);
634 + sTouch.state = TS_STATE_Z2;
635 + break;
636 +
637 + /*
638 + * Get the Z2 value for pressure measurement and set up
639 + * the switch register for getting the Y measurement.
640 + */
641 + case TS_STATE_Z2:
642 + sTouch.uiZ2 = ADCGetData(2, 200);
643 + ep93xx_ts_set_direct(sSwitchSettings.uiYSample);
644 + sTouch.state = TS_STATE_Y;
645 + break;
646 +
647 + /*
648 + * Get the Y value and set up the switch register for
649 + * getting the X measurement.
650 + */
651 + case TS_STATE_Y:
652 + sTouch.uiY = ADCGetData(4, 20);
653 + ep93xx_ts_set_direct(sSwitchSettings.uiXSample);
654 + sTouch.state = TS_STATE_X;
655 + break;
656 +
657 + /*
658 + * Read the X value. This is the last of the 4 adc values
659 + * we need so we continue on to process the data.
660 + */
661 + case TS_STATE_X:
662 + Stop_Timer2();
663 +
664 + sTouch.uiX = ADCGetData(4, 20);
665 +
666 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
667 + __raw_writel(sSwitchSettings.uiDischarge, EP93XX_TOUCHSCREEN_DIRECT);
668 +
669 + sTouch.state = TS_STATE_DONE;
670 +
671 + /*
672 + * Process this set of ADC readings.
673 + */
674 + ProcessPointData();
675 +
676 + break;
677 +
678 + /*
679 + * Shouldn't get here. But if we do, we can recover...
680 + */
681 + case TS_STATE_DONE:
682 + TS_Hardware_Scan_Mode();
683 + break;
684 + }
685 +
686 + /*
687 + * Clear the timer2 interrupt.
688 + */
689 + __raw_writel(1, EP93XX_TIMER2_CLEAR);
690 + return(IRQ_HANDLED);
691 +}
692 +
693 +/*---------------------------------------------------------------------
694 + * ProcessPointData
695 + *
696 + * This routine processes the ADC data into usable point data and then
697 + * puts the driver into hw or sw scanning mode before returning.
698 + *
699 + * We calculate inverse pressure (lower number = more pressure) then
700 + * do a hystheresis with the two pressure values 'light' and 'heavy'.
701 + *
702 + * If we are above the light, we have pen up.
703 + * If we are below the heavy we have pen down.
704 + * As long as the pressure stays below the light, pen stays down.
705 + * When we get above the light again, pen goes back up.
706 + *
707 + */
708 +static void ProcessPointData(void)
709 +{
710 + int bValidPoint = 0;
711 + unsigned int uiXDiff, uiYDiff, uiInvPressureDiff;
712 + unsigned int uiInvPressure;
713 +
714 + /*
715 + * Calculate the current pressure.
716 + */
717 + uiInvPressure = CalculateInvPressure();
718 +
719 + /*
720 + * If pen pressure is so light that it is greater than the 'max' setting
721 + * then we consider this to be a pen up.
722 + */
723 + if (uiInvPressure >= TS_LIGHT_INV_PRESSURE)
724 + {
725 + bCurrentPenDown = 0;
726 + ee93xx_ts_evt_add(0, guiLastX, guiLastY, 0);
727 + TS_Hardware_Scan_Mode();
728 + return;
729 + }
730 +
731 + /*
732 + * Hysteresis:
733 + * If the pen pressure is hard enough to be less than the 'min' OR
734 + * the pen is already down and is still less than the 'max'...
735 + */
736 + if ((uiInvPressure < TS_HEAVY_INV_PRESSURE) ||
737 + (bCurrentPenDown && (uiInvPressure < TS_LIGHT_INV_PRESSURE)))
738 + {
739 + if (bCurrentPenDown)
740 + {
741 + /*
742 + * If pen was previously down, check the difference between
743 + * the last sample and this one... if the difference between
744 + * samples is too great, ignore the sample.
745 + */
746 + uiXDiff = abs(guiLastX - sTouch.uiX);
747 + uiYDiff = abs(guiLastY - sTouch.uiY);
748 + uiInvPressureDiff = abs(guiLastInvPressure - uiInvPressure);
749 +
750 + if (uiXDiff < TS_MAX_VALID_XY_CHANGE
751 + && uiYDiff < TS_MAX_VALID_XY_CHANGE
752 + && uiInvPressureDiff < TS_MAX_VALID_PRESSURE_CHANGE)
753 + {
754 + bValidPoint = 1;
755 + }
756 + }
757 + else
758 + {
759 + bValidPoint = 1;
760 + }
761 +
762 + /*
763 + * If either the pen was put down or dragged make a note of it.
764 + */
765 + if (bValidPoint)
766 + {
767 + guiLastX = sTouch.uiX;
768 + guiLastY = sTouch.uiY;
769 + guiLastInvPressure = uiInvPressure;
770 + bCurrentPenDown = 1;
771 + ee93xx_ts_evt_add(1, sTouch.uiX, sTouch.uiY,
772 + 0x7000000 / uiInvPressure);
773 + }
774 +
775 + TS_Soft_Scan_Mode();
776 + return;
777 + }
778 +
779 + TS_Hardware_Scan_Mode();
780 +}
781 +
782 +static void ep93xx_ts_set_direct(unsigned int uiADCSwitch)
783 +{
784 + unsigned int uiResult;
785 +
786 + /*
787 + * Set the switch settings in the direct register.
788 + */
789 + __raw_writel(0xaa, EP93XX_TOUCHSCREEN_SWLOCK);
790 + __raw_writel(uiADCSwitch, EP93XX_TOUCHSCREEN_DIRECT);
791 +
792 + /*
793 + * Read and throw away the first sample.
794 + */
795 + do {
796 + uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
797 + } while (!(uiResult & TSXYRESULT_SDR));
798 +
799 +}
800 +
801 +static unsigned int ADCGetData(unsigned int uiSamples, unsigned int uiMaxDiff)
802 +{
803 + unsigned int uiResult, uiValue, uiCount, uiLowest, uiHighest, uiSum, uiAve;
804 +
805 + do
806 + {
807 + /*
808 + * Initialize our values.
809 + */
810 + uiLowest = 0xfffffff;
811 + uiHighest = 0;
812 + uiSum = 0;
813 +
814 + for (uiCount = 0; uiCount < uiSamples; uiCount++)
815 + {
816 + /*
817 + * Read the touch screen four more times and average.
818 + */
819 + do {
820 + uiResult = __raw_readl(EP93XX_TOUCHSCREEN_XYRESULT);
821 + } while (!(uiResult & TSXYRESULT_SDR));
822 +
823 + uiValue = (uiResult & TSXYRESULT_AD_MASK) >> TSXYRESULT_AD_SHIFT;
824 + uiValue = ((uiValue >> 4) + ((1 + TSXYRESULT_X_MASK)>>1)) & TSXYRESULT_X_MASK;
825 +
826 + /*
827 + * Add up the values.
828 + */
829 + uiSum += uiValue;
830 +
831 + /*
832 + * Get the lowest and highest values.
833 + */
834 + if (uiValue < uiLowest)
835 + {
836 + uiLowest = uiValue;
837 + }
838 + if (uiValue > uiHighest)
839 + {
840 + uiHighest = uiValue;
841 + }
842 + }
843 + } while ((uiHighest - uiLowest) > uiMaxDiff);
844 +
845 + /*
846 + * Calculate the Average value.
847 + */
848 + uiAve = uiSum / uiSamples;
849 +
850 + return uiAve;
851 +}
852 +
853 +/*
854 + * CalculateInvPressure
855 + *
856 + * Is the Touch Valid. Touch is not valid if the X or Y value is not
857 + * in range and the pressure is not enough.
858 + *
859 + * Touch resistance can be measured by the following formula:
860 + *
861 + * Rx * X * Z2
862 + * Rtouch = --------- * (-- - 1)
863 + * 4096 Z1
864 + *
865 + * This is simplified in the ration of Rtouch to Rx. The lower the value, the
866 + * higher the pressure.
867 + *
868 + * Z2
869 + * InvPressure = X * (-- - 1)
870 + * Z1
871 + */
872 +static unsigned int CalculateInvPressure(void)
873 +{
874 + unsigned int uiInvPressure;
875 +
876 + /*
877 + * Check to see if the point is valid.
878 + */
879 + if (sTouch.uiZ1 < MIN_Z1_VALUE)
880 + {
881 + uiInvPressure = 0x10000;
882 + }
883 +
884 + /*
885 + * Can omit the pressure calculation if you need to get rid of the division.
886 + */
887 + else
888 + {
889 + uiInvPressure = ((sTouch.uiX * sTouch.uiZ2) / sTouch.uiZ1) - sTouch.uiX;
890 + }
891 +
892 + return uiInvPressure;
893 +}
894 +
895 +/*
896 + * TS_Hardware_Scan_Mode
897 + *
898 + * Enables the ep93xx ts scanning engine so that when the pen goes down
899 + * we will get an interrupt.
900 + */
901 +static void TS_Hardware_Scan_Mode(void)
902 +{
903 + unsigned int uiDevCfg;
904 +
905 + /*
906 + * Disable the soft scanning engine.
907 + */
908 + sTouch.state = TS_STATE_STOPPED;
909 + Stop_Timer2();
910 +
911 + /*
912 + * Clear the TIN (Touchscreen INactive) bit so we can go to
913 + * automatic scanning mode.
914 + */
915 + uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
916 + ep93xx_syscon_swlocked_write(uiDevCfg & ~EP93XX_SYSCON_DEVCFG_TIN,
917 + EP93XX_SYSCON_DEVCFG);
918 +
919 + /*
920 + * Enable the touch screen scanning state machine by setting
921 + * the ENABLE bit.
922 + */
923 + __raw_writel(TSSETUP_DEFAULT | TSSETUP_ENABLE, EP93XX_TOUCHSCREEN_SETUP);
924 +
925 + /*
926 + * Set the flag to show that we are in interrupt mode.
927 + */
928 + gScanningMode = TS_MODE_HARDWARE_SCAN;
929 +
930 + /*
931 + * Initialize EP93XX_TOUCHSCREEN_SETUP2 register.
932 + */
933 + __raw_writel(TSSETUP2_DEFAULT, EP93XX_TOUCHSCREEN_SETUP2);
934 +
935 +}
936 +
937 +/*
938 + * TS_Soft_Scan_Mode
939 + *
940 + * Sets the touch screen to manual polling mode.
941 + */
942 +static void TS_Soft_Scan_Mode(void)
943 +{
944 + unsigned int uiDevCfg;
945 +
946 + if (gScanningMode != TS_MODE_SOFT_SCAN)
947 + {
948 + /*
949 + * Disable the touch screen scanning state machine by clearing
950 + * the ENABLE bit.
951 + */
952 + __raw_writel(TSSETUP_DEFAULT, EP93XX_TOUCHSCREEN_SETUP);
953 +
954 + /*
955 + * Set the TIN bit so we can do manual touchscreen polling.
956 + */
957 + uiDevCfg = __raw_readl(EP93XX_SYSCON_DEVCFG);
958 + ep93xx_syscon_swlocked_write(uiDevCfg | EP93XX_SYSCON_DEVCFG_TIN,
959 + EP93XX_SYSCON_DEVCFG);
960 + }
961 +
962 + /*
963 + * Set the switch register up for the first ADC reading
964 + */
965 + ep93xx_ts_set_direct(sSwitchSettings.uiSwitchZ1);
966 +
967 + /*
968 + * Initialize our software state machine to know which ADC
969 + * reading to take
970 + */
971 + sTouch.state = TS_STATE_Z1;
972 +
973 + /*
974 + * Set the timer so after a mSec or two settling delay it will
975 + * take the first ADC reading.
976 + */
977 + Set_Timer2_uSec(EP93XX_TS_PER_POINT_DELAY_USEC);
978 +
979 + /*
980 + * Note that we are in sw scanning mode not hw scanning mode.
981 + */
982 + gScanningMode = TS_MODE_SOFT_SCAN;
983 +
984 +}
985 +
986 +static void Set_Timer2_uSec(unsigned int uiDelay_uSec)
987 +{
988 + unsigned int uiClockTicks;
989 +
990 + /*
991 + * Stop timer 2
992 + */
993 + __raw_writel(0, EP93XX_TIMER2_CONTROL);
994 +
995 + uiClockTicks = ((uiDelay_uSec * 508) + 999) / 1000;
996 + __raw_writel(uiClockTicks, EP93XX_TIMER2_LOAD);
997 + __raw_writel(uiClockTicks, EP93XX_TIMER2_VALUE);
998 +
999 + /*
1000 + * Set up Timer 2 for 508 kHz clock and periodic mode.
1001 + */
1002 + __raw_writel(0xC8, EP93XX_TIMER2_CONTROL);
1003 +
1004 +}
1005 +
1006 +static void Stop_Timer2(void)
1007 +{
1008 + __raw_writel(0, EP93XX_TIMER2_CONTROL);
1009 +}
1010 +
1011 +/*
1012 + * Initialization and exit routines
1013 + */
1014 +int __init ep93xx_ts_init(void)
1015 +{
1016 + int retval;
1017 +
1018 + retval = request_irq(IRQ_EP93XX_TOUCH, ep93xx_ts_isr,
1019 + IRQF_DISABLED, "ep93xx_ts", 0);
1020 + if (retval)
1021 + {
1022 + printk(KERN_WARNING "ep93xx_ts: failed to get touchscreen IRQ\n");
1023 + return retval;
1024 + }
1025 +
1026 + retval = request_irq(IRQ_EP93XX_TIMER2, ep93xx_timer2_isr,
1027 + IRQF_DISABLED, "ep93xx_timer2", 0);
1028 + if (retval)
1029 + {
1030 + printk(KERN_WARNING "ep93xx_ts: failed to get timer2 IRQ\n");
1031 + free_irq(IRQ_EP93XX_TOUCH, 0);
1032 + return retval;
1033 + }
1034 +
1035 + misc_register(&ep93xx_ts_miscdev);
1036 +
1037 + sTouch.state = TS_STATE_STOPPED;
1038 + gScanningMode = TS_MODE_UN_INITIALIZED;
1039 +
1040 + printk(KERN_NOTICE "ep93xx touchscreen driver configured for 4-wire operation\n");
1041 +
1042 + return 0;
1043 +}
1044 +
1045 +void __exit ep93xx_ts_exit(void)
1046 +{
1047 + Stop_Timer2();
1048 +
1049 + free_irq(IRQ_EP93XX_TOUCH, 0);
1050 + free_irq(IRQ_EP93XX_TIMER2, 0);
1051 +
1052 + misc_deregister(&ep93xx_ts_miscdev);
1053 +}
1054 +
1055 +module_init(ep93xx_ts_init);
1056 +module_exit(ep93xx_ts_exit);
1057 +
1058 +MODULE_DESCRIPTION("Cirrus EP93xx touchscreen driver");
1059 +MODULE_SUPPORTED_DEVICE("touchscreen/ep93xx");
1060 +MODULE_LICENSE("GPL");