summaryrefslogtreecommitdiff
path: root/target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c
blob: 93163ff509f6f57121495bc2ea376992279ae5e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Copyright (c) 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
 * iPAQ H1940 touchscreen support
 *
 * ChangeLog
 *
 * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at>
 *      - added clock (de-)allocation code
 *
 * 2005-03-06: Arnaud Patard <arnaud.patard@rtp-net.org>
 *      - h1940_ -> s3c2410 (this driver is now also used on the n30
 *        machines :P)
 *      - Debug messages are now enabled with the config option
 *        TOUCHSCREEN_S3C2410_DEBUG
 *      - Changed the way the value are read
 *      - Input subsystem should now work
 *      - Use ioremap and readl/writel
 *
 * 2005-03-23: Arnaud Patard <arnaud.patard@rtp-net.org>
 *      - Make use of some undocumented features of the touchscreen
 *        controller
 *
 * 2007-05-23: Harald Welte <laforge@openmoko.org>
 *      - Add proper support for S32440
 *
 * 2008-06-23: Andy Green <andy@openmoko.com>
 *      - removed averaging system
 *      - added generic Touchscreen filter stuff
 *
 * 2008-11-27: Nelson Castillo <arhuaco@freaks-unidos.net>
 *      - improve interrupt handling
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/timer.h>
#include <linux/kfifo.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <mach/regs-gpio.h>
#include <mach/ts.h>
#include <mach/hardware.h>
#include <plat/regs-adc.h>

#include <linux/touchscreen/ts_filter_chain.h>

/* For ts.dev.id.version */
#define S3C2410TSVERSION	0x0101

#define TSC_SLEEP  (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))

#define WAIT4INT(x)  (((x)<<8) | \
		     S3C2410_ADCTSC_YM_SEN | \
		     S3C2410_ADCTSC_YP_SEN | \
		     S3C2410_ADCTSC_XP_SEN | \
		     S3C2410_ADCTSC_XY_PST(3))

#define AUTOPST	     (S3C2410_ADCTSC_YM_SEN | \
		      S3C2410_ADCTSC_YP_SEN | \
		      S3C2410_ADCTSC_XP_SEN | \
		      S3C2410_ADCTSC_AUTO_PST | \
		      S3C2410_ADCTSC_XY_PST(0))

#define DEBUG_LVL    KERN_DEBUG

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("s3c2410 touchscreen driver");
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

static char *s3c2410ts_name = "s3c2410 TouchScreen";

#define TS_RELEASE_TIMEOUT (HZ >> 7 ? HZ >> 7 : 1) /* 8ms (5ms if HZ is 200) */
#define TS_EVENT_FIFO_SIZE (2 << 6) /* must be a power of 2 */

#define TS_STATE_STANDBY 0 /* initial state */
#define TS_STATE_PRESSED 1
#define TS_STATE_RELEASE_PENDING 2
#define TS_STATE_RELEASE 3

/*
 * Per-touchscreen data.
 */

struct s3c2410ts {
	struct input_dev *dev;
	struct ts_filter_chain *chain;
	int is_down;
	int state;
	struct kfifo *event_fifo;
};

static struct s3c2410ts ts;

static void __iomem *base_addr;

/*
 * A few low level functions.
 */

static inline void s3c2410_ts_connect(void)
{
	s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);
	s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
	s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
	s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
}

static void s3c2410_ts_start_adc_conversion(void)
{
	writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
	       base_addr + S3C2410_ADCTSC);
	writel(readl(base_addr + S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
	       base_addr + S3C2410_ADCCON);
}

/*
 * Just send the input events.
 */

enum ts_input_event {IE_DOWN = 0, IE_UP};

static void ts_input_report(int event, int coords[])
{
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
	static char *s[] = {"down", "up"};
	struct timeval tv;

	do_gettimeofday(&tv);
#endif

	if (event == IE_DOWN) {
		input_report_abs(ts.dev, ABS_X, coords[0]);
		input_report_abs(ts.dev, ABS_Y, coords[1]);
		input_report_key(ts.dev, BTN_TOUCH, 1);
		input_report_abs(ts.dev, ABS_PRESSURE, 1);

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
		printk(DEBUG_LVL "T:%06d %6s (X:%03d, Y:%03d)\n",
		       (int)tv.tv_usec, s[event], coords[0], coords[1]);
#endif
	} else {
		input_report_key(ts.dev, BTN_TOUCH, 0);
		input_report_abs(ts.dev, ABS_PRESSURE, 0);

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
		printk(DEBUG_LVL "T:%06d %6s\n",
		       (int)tv.tv_usec, s[event]);
#endif
	}

	input_sync(ts.dev);
}

/*
 * Manage the state of the touchscreen.
 */

static void event_send_timer_f(unsigned long data);

static struct timer_list event_send_timer =
		TIMER_INITIALIZER(event_send_timer_f, 0, 0);

static void event_send_timer_f(unsigned long data)
{
	static int noop_counter;
	int event_type;

	while (__kfifo_get(ts.event_fifo, (unsigned char *)&event_type,
			   sizeof(int))) {
		int buf[2];

		switch (event_type) {
		case 'D':
			if (ts.state == TS_STATE_RELEASE_PENDING)
				/* Ignore short UP event */
				ts.state = TS_STATE_PRESSED;
			break;

		case 'U':
			ts.state = TS_STATE_RELEASE_PENDING;
			break;

		case 'P':
			if (ts.is_down) /* stylus_action needs a conversion */
				s3c2410_ts_start_adc_conversion();

			if (unlikely(__kfifo_get(ts.event_fifo,
						 (unsigned char *)buf,
						 sizeof(int) * 2)
				     != sizeof(int) * 2))
				goto ts_exit_error;

			ts_input_report(IE_DOWN, buf);
			ts.state = TS_STATE_PRESSED;
			break;

		default:
			goto ts_exit_error;
		}

		noop_counter = 0;
	}

	if (noop_counter++ >= 1) {
		noop_counter = 0;
		if (ts.state == TS_STATE_RELEASE_PENDING) {
			/*
			 * We delay the UP event for a while to avoid jitter.
			 * If we get a DOWN event we do not send it.
			 */
			ts_input_report(IE_UP, NULL);
			ts.state = TS_STATE_STANDBY;

			ts_filter_chain_clear(ts.chain);
		}
	} else {
		mod_timer(&event_send_timer, jiffies + TS_RELEASE_TIMEOUT);
	}

	return;

ts_exit_error: /* should not happen unless we have a bug */
	printk(KERN_ERR __FILE__ ": event_send_timer_f failed\n");
}

/*
 * Manage interrupts.
 */

static irqreturn_t stylus_updown(int irq, void *dev_id)
{
	unsigned long data0;
	unsigned long data1;
	int event_type;

	data0 = readl(base_addr+S3C2410_ADCDAT0);
	data1 = readl(base_addr+S3C2410_ADCDAT1);

	ts.is_down = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) &&
					    (!(data1 & S3C2410_ADCDAT0_UPDOWN));

	event_type = ts.is_down ? 'D' : 'U';

	if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)&event_type,
		     sizeof(int)) != sizeof(int))) /* should not happen */
		printk(KERN_ERR __FILE__": stylus_updown lost event!\n");

	if (ts.is_down)
		s3c2410_ts_start_adc_conversion();
	else
		writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);

	mod_timer(&event_send_timer, jiffies + 1);

	return IRQ_HANDLED;
}

static irqreturn_t stylus_action(int irq, void *dev_id)
{
	int buf[3];

	/* Grab the ADC results. */
	buf[1] = readl(base_addr + S3C2410_ADCDAT0) &
		       S3C2410_ADCDAT0_XPDATA_MASK;
	buf[2] = readl(base_addr + S3C2410_ADCDAT1) &
		       S3C2410_ADCDAT1_YPDATA_MASK;

	switch (ts_filter_chain_feed(ts.chain, &buf[1])) {
	case 0:
		/* The filter wants more points. */
		s3c2410_ts_start_adc_conversion();
		return IRQ_HANDLED;
	case 1:
		/* We have a point from the filters or no filtering enabled. */
		buf[0] = 'P';
		break;
	default:
		printk(KERN_ERR __FILE__
		       ":%d Invalid ts_filter_chain_feed return value.\n",
		       __LINE__);
	case -1:
		/* Error. Ignore the event. */
		ts_filter_chain_clear(ts.chain);
		writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
		return IRQ_HANDLED;
	};

	if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)buf,
		     sizeof(int) * 3) != sizeof(int) * 3))
		printk(KERN_ERR __FILE__":stylus_action bug.\n");

	writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
	mod_timer(&event_send_timer, jiffies + 1);

	return IRQ_HANDLED;
}

static struct clk	*adc_clock;

/*
 * The functions for inserting/removing us as a module.
 */

static int __init s3c2410ts_probe(struct platform_device *pdev)
{
	int rc;
	struct s3c2410_ts_mach_info *info;
	struct input_dev *input_dev;
	int ret = 0;

	dev_info(&pdev->dev, "Starting\n");

	info = (struct s3c2410_ts_mach_info *)pdev->dev.platform_data;

	if (!info)
	{
		dev_err(&pdev->dev, "Hm... too bad: no platform data for ts\n");
		return -EINVAL;
	}

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
	printk(DEBUG_LVL "Entering s3c2410ts_init\n");
#endif

	adc_clock = clk_get(NULL, "adc");
	if (!adc_clock) {
		dev_err(&pdev->dev, "failed to get adc clock source\n");
		return -ENOENT;
	}
	clk_enable(adc_clock);

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
	printk(DEBUG_LVL "got and enabled clock\n");
#endif

	base_addr = ioremap(S3C2410_PA_ADC,0x20);
	if (base_addr == NULL) {
		dev_err(&pdev->dev, "Failed to remap register block\n");
		ret = -ENOMEM;
		goto bail0;
	}


	/* If we acutally are a S3C2410: Configure GPIOs */
	if (!strcmp(pdev->name, "s3c2410-ts"))
		s3c2410_ts_connect();

	if ((info->presc & 0xff) > 0)
		writel(S3C2410_ADCCON_PRSCEN |
		       S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
						    base_addr + S3C2410_ADCCON);
	else
		writel(0, base_addr+S3C2410_ADCCON);

	/* Initialise registers */
	if ((info->delay & 0xffff) > 0)
		writel(info->delay & 0xffff,  base_addr + S3C2410_ADCDLY);

	writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);

	/* Initialise input stuff */
	memset(&ts, 0, sizeof(struct s3c2410ts));
	input_dev = input_allocate_device();

	if (!input_dev) {
		dev_err(&pdev->dev, "Unable to allocate the input device\n");
		ret = -ENOMEM;
		goto bail1;
	}

	ts.dev = input_dev;
	ts.dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) |
			   BIT_MASK(EV_ABS);
	ts.dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
	input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0);
	input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
	input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0);

	ts.dev->name = s3c2410ts_name;
	ts.dev->id.bustype = BUS_RS232;
	ts.dev->id.vendor = 0xDEAD;
	ts.dev->id.product = 0xBEEF;
	ts.dev->id.version = S3C2410TSVERSION;
	ts.state = TS_STATE_STANDBY;
	ts.event_fifo = kfifo_alloc(TS_EVENT_FIFO_SIZE, GFP_KERNEL, NULL);
	if (IS_ERR(ts.event_fifo)) {
		ret = -EIO;
		goto bail2;
	}

	/* create the filter chain set up for the 2 coordinates we produce */
	ts.chain = ts_filter_chain_create(pdev, info->filter_config, 2);

	if (IS_ERR(ts.chain))
		goto bail2;

	ts_filter_chain_clear(ts.chain);

	/* Get irqs */
	if (request_irq(IRQ_ADC, stylus_action, 0,
						    "s3c2410_action", ts.dev)) {
		dev_err(&pdev->dev, "Could not allocate ts IRQ_ADC !\n");
		iounmap(base_addr);
		ret = -EIO;
		goto bail3;
	}
	if (request_irq(IRQ_TC, stylus_updown, 0,
			"s3c2410_action", ts.dev)) {
		dev_err(&pdev->dev, "Could not allocate ts IRQ_TC !\n");
		free_irq(IRQ_ADC, ts.dev);
		iounmap(base_addr);
		ret = -EIO;
		goto bail4;
	}

	dev_info(&pdev->dev, "Successfully loaded\n");

	/* All went ok, so register to the input system */
	rc = input_register_device(ts.dev);
	if (rc) {
		ret = -EIO;
		goto bail5;
	}

	return 0;

bail5:
	free_irq(IRQ_TC, ts.dev);
	free_irq(IRQ_ADC, ts.dev);
	clk_disable(adc_clock);
	iounmap(base_addr);
	disable_irq(IRQ_TC);
bail4:
	disable_irq(IRQ_ADC);
bail3:
	ts_filter_chain_destroy(ts.chain);
	kfifo_free(ts.event_fifo);
bail2:
	input_unregister_device(ts.dev);
bail1:
	iounmap(base_addr);
bail0:

	return ret;
}

static int s3c2410ts_remove(struct platform_device *pdev)
{
	disable_irq(IRQ_ADC);
	disable_irq(IRQ_TC);
	free_irq(IRQ_TC,ts.dev);
	free_irq(IRQ_ADC,ts.dev);

	if (adc_clock) {
		clk_disable(adc_clock);
		clk_put(adc_clock);
		adc_clock = NULL;
	}

	input_unregister_device(ts.dev);
	iounmap(base_addr);

	ts_filter_chain_destroy(ts.chain);

	kfifo_free(ts.event_fifo);

	return 0;
}

#ifdef CONFIG_PM
static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state)
{
	writel(TSC_SLEEP, base_addr+S3C2410_ADCTSC);
	writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_STDBM,
	       base_addr+S3C2410_ADCCON);

	disable_irq(IRQ_ADC);
	disable_irq(IRQ_TC);

	clk_disable(adc_clock);

	return 0;
}

static int s3c2410ts_resume(struct platform_device *pdev)
{
	struct s3c2410_ts_mach_info *info =
		( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;

	clk_enable(adc_clock);
	mdelay(1);

	ts_filter_chain_clear(ts.chain);

	enable_irq(IRQ_ADC);
	enable_irq(IRQ_TC);

	if ((info->presc&0xff) > 0)
		writel(S3C2410_ADCCON_PRSCEN |
		       S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
						      base_addr+S3C2410_ADCCON);
	else
		writel(0,base_addr+S3C2410_ADCCON);

	/* Initialise registers */
	if ((info->delay & 0xffff) > 0)
		writel(info->delay & 0xffff,  base_addr+S3C2410_ADCDLY);

	writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);

	return 0;
}

#else
#define s3c2410ts_suspend NULL
#define s3c2410ts_resume  NULL
#endif

static struct platform_driver s3c2410ts_driver = {
       .driver         = {
	       .name   = "s3c2410-ts",
	       .owner  = THIS_MODULE,
       },
       .probe          = s3c2410ts_probe,
       .remove         = s3c2410ts_remove,
       .suspend        = s3c2410ts_suspend,
       .resume         = s3c2410ts_resume,

};

static struct platform_driver s3c2440ts_driver = {
       .driver         = {
	       .name   = "s3c2440-ts",
	       .owner  = THIS_MODULE,
       },
       .probe          = s3c2410ts_probe,
       .remove         = s3c2410ts_remove,
       .suspend        = s3c2410ts_suspend,
       .resume         = s3c2410ts_resume,

};

static int __init s3c2410ts_init(void)
{
	int rc;

	rc = platform_driver_register(&s3c2410ts_driver);
	if (rc < 0)
		return rc;

	rc = platform_driver_register(&s3c2440ts_driver);
	if (rc < 0)
		platform_driver_unregister(&s3c2410ts_driver);

	return rc;
}

static void __exit s3c2410ts_exit(void)
{
	platform_driver_unregister(&s3c2440ts_driver);
	platform_driver_unregister(&s3c2410ts_driver);
}

module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);