summaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/tsc2005.c
blob: b6adeaee9cc5f0f226781f59ba79961fd9eb1e0b (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
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
/*
 * TSC2005 touchscreen driver
 *
 * Copyright (C) 2006-2010 Nokia Corporation
 *
 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
 * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
 *
 * 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
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/spi/tsc2005.h>

/*
 * The touchscreen interface operates as follows:
 *
 * 1) Pen is pressed against the touchscreen.
 * 2) TSC2005 performs AD conversion.
 * 3) After the conversion is done TSC2005 drives DAV line down.
 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
 *    values.
 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
 *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
 * 7) When the penup timer expires, there have not been touch or DAV interrupts
 *    during the last 40ms which means the pen has been lifted.
 *
 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
 * after a configurable period (in ms) of activity. If esd_timeout is 0, the
 * watchdog is disabled.
 */

/* control byte 1 */
#define TSC2005_CMD			0x80
#define TSC2005_CMD_NORMAL		0x00
#define TSC2005_CMD_STOP		0x01
#define TSC2005_CMD_12BIT		0x04

/* control byte 0 */
#define TSC2005_REG_READ		0x0001
#define TSC2005_REG_PND0		0x0002
#define TSC2005_REG_X			0x0000
#define TSC2005_REG_Y			0x0008
#define TSC2005_REG_Z1			0x0010
#define TSC2005_REG_Z2			0x0018
#define TSC2005_REG_TEMP_HIGH		0x0050
#define TSC2005_REG_CFR0		0x0060
#define TSC2005_REG_CFR1		0x0068
#define TSC2005_REG_CFR2		0x0070

/* configuration register 0 */
#define TSC2005_CFR0_PRECHARGE_276US	0x0040
#define TSC2005_CFR0_STABTIME_1MS	0x0300
#define TSC2005_CFR0_CLOCK_1MHZ		0x1000
#define TSC2005_CFR0_RESOLUTION12	0x2000
#define TSC2005_CFR0_PENMODE		0x8000
#define TSC2005_CFR0_INITVALUE		(TSC2005_CFR0_STABTIME_1MS    | \
					 TSC2005_CFR0_CLOCK_1MHZ      | \
					 TSC2005_CFR0_RESOLUTION12    | \
					 TSC2005_CFR0_PRECHARGE_276US | \
					 TSC2005_CFR0_PENMODE)

/* bits common to both read and write of configuration register 0 */
#define	TSC2005_CFR0_RW_MASK		0x3fff

/* configuration register 1 */
#define TSC2005_CFR1_BATCHDELAY_4MS	0x0003
#define TSC2005_CFR1_INITVALUE		TSC2005_CFR1_BATCHDELAY_4MS

/* configuration register 2 */
#define TSC2005_CFR2_MAVE_Z		0x0004
#define TSC2005_CFR2_MAVE_Y		0x0008
#define TSC2005_CFR2_MAVE_X		0x0010
#define TSC2005_CFR2_AVG_7		0x0800
#define TSC2005_CFR2_MEDIUM_15		0x3000
#define TSC2005_CFR2_INITVALUE		(TSC2005_CFR2_MAVE_X	| \
					 TSC2005_CFR2_MAVE_Y	| \
					 TSC2005_CFR2_MAVE_Z	| \
					 TSC2005_CFR2_MEDIUM_15	| \
					 TSC2005_CFR2_AVG_7)

#define MAX_12BIT			0xfff
#define TSC2005_SPI_MAX_SPEED_HZ	10000000
#define TSC2005_PENUP_TIME_MS		40

struct tsc2005_spi_rd {
	struct spi_transfer	spi_xfer;
	u32			spi_tx;
	u32			spi_rx;
};

struct tsc2005 {
	struct spi_device	*spi;

	struct spi_message      spi_read_msg;
	struct tsc2005_spi_rd	spi_x;
	struct tsc2005_spi_rd	spi_y;
	struct tsc2005_spi_rd	spi_z1;
	struct tsc2005_spi_rd	spi_z2;

	struct input_dev	*idev;
	char			phys[32];

	struct mutex		mutex;

	/* raw copy of previous x,y,z */
	int			in_x;
	int			in_y;
	int                     in_z1;
	int			in_z2;

	spinlock_t		lock;
	struct timer_list	penup_timer;

	unsigned int		esd_timeout;
	struct delayed_work	esd_work;
	unsigned long		last_valid_interrupt;

	unsigned int		x_plate_ohm;

	bool			opened;
	bool			suspended;

	bool			pen_down;

	void			(*set_reset)(bool enable);
};

static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
{
	u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
	struct spi_transfer xfer = {
		.tx_buf		= &tx,
		.len		= 1,
		.bits_per_word	= 8,
	};
	struct spi_message msg;
	int error;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error) {
		dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
			__func__, cmd, error);
		return error;
	}

	return 0;
}

static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
{
	u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
	struct spi_transfer xfer = {
		.tx_buf		= &tx,
		.len		= 4,
		.bits_per_word	= 24,
	};
	struct spi_message msg;
	int error;

	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error) {
		dev_err(&ts->spi->dev,
			"%s: failed, register: %x, value: %x, error: %d\n",
			__func__, reg, value, error);
		return error;
	}

	return 0;
}

static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
{
	memset(rd, 0, sizeof(*rd));

	rd->spi_tx		   = (reg | TSC2005_REG_READ) << 16;
	rd->spi_xfer.tx_buf	   = &rd->spi_tx;
	rd->spi_xfer.rx_buf	   = &rd->spi_rx;
	rd->spi_xfer.len	   = 4;
	rd->spi_xfer.bits_per_word = 24;
	rd->spi_xfer.cs_change	   = !last;
}

static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
{
	struct tsc2005_spi_rd spi_rd;
	struct spi_message msg;
	int error;

	tsc2005_setup_read(&spi_rd, reg, true);

	spi_message_init(&msg);
	spi_message_add_tail(&spi_rd.spi_xfer, &msg);

	error = spi_sync(ts->spi, &msg);
	if (error)
		return error;

	*value = spi_rd.spi_rx;
	return 0;
}

static void tsc2005_update_pen_state(struct tsc2005 *ts,
				     int x, int y, int pressure)
{
	if (pressure) {
		input_report_abs(ts->idev, ABS_X, x);
		input_report_abs(ts->idev, ABS_Y, y);
		input_report_abs(ts->idev, ABS_PRESSURE, pressure);
		if (!ts->pen_down) {
			input_report_key(ts->idev, BTN_TOUCH, !!pressure);
			ts->pen_down = true;
		}
	} else {
		input_report_abs(ts->idev, ABS_PRESSURE, 0);
		if (ts->pen_down) {
			input_report_key(ts->idev, BTN_TOUCH, 0);
			ts->pen_down = false;
		}
	}
	input_sync(ts->idev);
	dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
		pressure);
}

static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
{
	struct tsc2005 *ts = _ts;
	unsigned long flags;
	unsigned int pressure;
	u32 x, y;
	u32 z1, z2;
	int error;

	/* read the coordinates */
	error = spi_sync(ts->spi, &ts->spi_read_msg);
	if (unlikely(error))
		goto out;

	x = ts->spi_x.spi_rx;
	y = ts->spi_y.spi_rx;
	z1 = ts->spi_z1.spi_rx;
	z2 = ts->spi_z2.spi_rx;

	/* validate position */
	if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
		goto out;

	/* Skip reading if the pressure components are out of range */
	if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
		goto out;

       /*
	* Skip point if this is a pen down with the exact same values as
	* the value before pen-up - that implies SPI fed us stale data
	*/
	if (!ts->pen_down &&
	    ts->in_x == x && ts->in_y == y &&
	    ts->in_z1 == z1 && ts->in_z2 == z2) {
		goto out;
	}

	/*
	 * At this point we are happy we have a valid and useful reading.
	 * Remember it for later comparisons. We may now begin downsampling.
	 */
	ts->in_x = x;
	ts->in_y = y;
	ts->in_z1 = z1;
	ts->in_z2 = z2;

	/* Compute touch pressure resistance using equation #1 */
	pressure = x * (z2 - z1) / z1;
	pressure = pressure * ts->x_plate_ohm / 4096;
	if (unlikely(pressure > MAX_12BIT))
		goto out;

	spin_lock_irqsave(&ts->lock, flags);

	tsc2005_update_pen_state(ts, x, y, pressure);
	mod_timer(&ts->penup_timer,
		  jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));

	spin_unlock_irqrestore(&ts->lock, flags);

	ts->last_valid_interrupt = jiffies;
out:
	return IRQ_HANDLED;
}

static void tsc2005_penup_timer(unsigned long data)
{
	struct tsc2005 *ts = (struct tsc2005 *)data;
	unsigned long flags;

	spin_lock_irqsave(&ts->lock, flags);
	tsc2005_update_pen_state(ts, 0, 0, 0);
	spin_unlock_irqrestore(&ts->lock, flags);
}

static void tsc2005_start_scan(struct tsc2005 *ts)
{
	tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
	tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
	tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
	tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
}

static void tsc2005_stop_scan(struct tsc2005 *ts)
{
	tsc2005_cmd(ts, TSC2005_CMD_STOP);
}

/* must be called with ts->mutex held */
static void __tsc2005_disable(struct tsc2005 *ts)
{
	tsc2005_stop_scan(ts);

	disable_irq(ts->spi->irq);
	del_timer_sync(&ts->penup_timer);

	cancel_delayed_work_sync(&ts->esd_work);

	enable_irq(ts->spi->irq);
}

/* must be called with ts->mutex held */
static void __tsc2005_enable(struct tsc2005 *ts)
{
	tsc2005_start_scan(ts);

	if (ts->esd_timeout && ts->set_reset) {
		ts->last_valid_interrupt = jiffies;
		schedule_delayed_work(&ts->esd_work,
				round_jiffies_relative(
					msecs_to_jiffies(ts->esd_timeout)));
	}

}

static ssize_t tsc2005_selftest_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);
	u16 temp_high;
	u16 temp_high_orig;
	u16 temp_high_test;
	bool success = true;
	int error;

	mutex_lock(&ts->mutex);

	/*
	 * Test TSC2005 communications via temp high register.
	 */
	__tsc2005_disable(ts);

	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
	if (error) {
		dev_warn(dev, "selftest failed: read error %d\n", error);
		success = false;
		goto out;
	}

	temp_high_test = (temp_high_orig - 1) & MAX_12BIT;

	error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
	if (error) {
		dev_warn(dev, "selftest failed: write error %d\n", error);
		success = false;
		goto out;
	}

	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
	if (error) {
		dev_warn(dev, "selftest failed: read error %d after write\n",
			 error);
		success = false;
		goto out;
	}

	if (temp_high != temp_high_test) {
		dev_warn(dev, "selftest failed: %d != %d\n",
			 temp_high, temp_high_test);
		success = false;
	}

	/* hardware reset */
	ts->set_reset(false);
	usleep_range(100, 500); /* only 10us required */
	ts->set_reset(true);

	if (!success)
		goto out;

	/* test that the reset really happened */
	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
	if (error) {
		dev_warn(dev, "selftest failed: read error %d after reset\n",
			 error);
		success = false;
		goto out;
	}

	if (temp_high != temp_high_orig) {
		dev_warn(dev, "selftest failed after reset: %d != %d\n",
			 temp_high, temp_high_orig);
		success = false;
	}

out:
	__tsc2005_enable(ts);
	mutex_unlock(&ts->mutex);

	return sprintf(buf, "%d\n", success);
}

static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);

static struct attribute *tsc2005_attrs[] = {
	&dev_attr_selftest.attr,
	NULL
};

static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
				      struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);
	umode_t mode = attr->mode;

	if (attr == &dev_attr_selftest.attr) {
		if (!ts->set_reset)
			mode = 0;
	}

	return mode;
}

static const struct attribute_group tsc2005_attr_group = {
	.is_visible	= tsc2005_attr_is_visible,
	.attrs		= tsc2005_attrs,
};

static void tsc2005_esd_work(struct work_struct *work)
{
	struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
	int error;
	u16 r;

	if (!mutex_trylock(&ts->mutex)) {
		/*
		 * If the mutex is taken, it means that disable or enable is in
		 * progress. In that case just reschedule the work. If the work
		 * is not needed, it will be canceled by disable.
		 */
		goto reschedule;
	}

	if (time_is_after_jiffies(ts->last_valid_interrupt +
				  msecs_to_jiffies(ts->esd_timeout)))
		goto out;

	/* We should be able to read register without disabling interrupts. */
	error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
	if (!error &&
	    !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
		goto out;
	}

	/*
	 * If we could not read our known value from configuration register 0
	 * then we should reset the controller as if from power-up and start
	 * scanning again.
	 */
	dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");

	disable_irq(ts->spi->irq);
	del_timer_sync(&ts->penup_timer);

	tsc2005_update_pen_state(ts, 0, 0, 0);

	ts->set_reset(false);
	usleep_range(100, 500); /* only 10us required */
	ts->set_reset(true);

	enable_irq(ts->spi->irq);
	tsc2005_start_scan(ts);

out:
	mutex_unlock(&ts->mutex);
reschedule:
	/* re-arm the watchdog */
	schedule_delayed_work(&ts->esd_work,
			      round_jiffies_relative(
					msecs_to_jiffies(ts->esd_timeout)));
}

static int tsc2005_open(struct input_dev *input)
{
	struct tsc2005 *ts = input_get_drvdata(input);

	mutex_lock(&ts->mutex);

	if (!ts->suspended)
		__tsc2005_enable(ts);

	ts->opened = true;

	mutex_unlock(&ts->mutex);

	return 0;
}

static void tsc2005_close(struct input_dev *input)
{
	struct tsc2005 *ts = input_get_drvdata(input);

	mutex_lock(&ts->mutex);

	if (!ts->suspended)
		__tsc2005_disable(ts);

	ts->opened = false;

	mutex_unlock(&ts->mutex);
}

static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
{
	tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
	tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
	tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
	tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);

	spi_message_init(&ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
	spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
}

static int __devinit tsc2005_probe(struct spi_device *spi)
{
	const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
	struct tsc2005 *ts;
	struct input_dev *input_dev;
	unsigned int max_x, max_y, max_p;
	unsigned int fudge_x, fudge_y, fudge_p;
	int error;

	if (!pdata) {
		dev_dbg(&spi->dev, "no platform data\n");
		return -ENODEV;
	}

	fudge_x	= pdata->ts_x_fudge	   ? : 4;
	fudge_y	= pdata->ts_y_fudge	   ? : 8;
	fudge_p	= pdata->ts_pressure_fudge ? : 2;
	max_x	= pdata->ts_x_max	   ? : MAX_12BIT;
	max_y	= pdata->ts_y_max	   ? : MAX_12BIT;
	max_p	= pdata->ts_pressure_max   ? : MAX_12BIT;

	if (spi->irq <= 0) {
		dev_dbg(&spi->dev, "no irq\n");
		return -ENODEV;
	}

	spi->mode = SPI_MODE_0;
	spi->bits_per_word = 8;
	if (!spi->max_speed_hz)
		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;

	error = spi_setup(spi);
	if (error)
		return error;

	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ts || !input_dev) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	ts->spi = spi;
	ts->idev = input_dev;

	ts->x_plate_ohm	= pdata->ts_x_plate_ohm	? : 280;
	ts->esd_timeout	= pdata->esd_timeout_ms;
	ts->set_reset	= pdata->set_reset;

	mutex_init(&ts->mutex);

	spin_lock_init(&ts->lock);
	setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);

	INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);

	tsc2005_setup_spi_xfer(ts);

	snprintf(ts->phys, sizeof(ts->phys),
		 "%s/input-ts", dev_name(&spi->dev));

	input_dev->name = "TSC2005 touchscreen";
	input_dev->phys = ts->phys;
	input_dev->id.bustype = BUS_SPI;
	input_dev->dev.parent = &spi->dev;
	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);

	input_dev->open = tsc2005_open;
	input_dev->close = tsc2005_close;

	input_set_drvdata(input_dev, ts);

	/* Ensure the touchscreen is off */
	tsc2005_stop_scan(ts);

	error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
				     IRQF_TRIGGER_RISING, "tsc2005", ts);
	if (error) {
		dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
		goto err_free_mem;
	}

	spi_set_drvdata(spi, ts);
	error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
	if (error) {
		dev_err(&spi->dev,
			"Failed to create sysfs attributes, err: %d\n", error);
		goto err_clear_drvdata;
	}

	error = input_register_device(ts->idev);
	if (error) {
		dev_err(&spi->dev,
			"Failed to register input device, err: %d\n", error);
		goto err_remove_sysfs;
	}

	irq_set_irq_wake(spi->irq, 1);
	return 0;

err_remove_sysfs:
	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
err_clear_drvdata:
	spi_set_drvdata(spi, NULL);
	free_irq(spi->irq, ts);
err_free_mem:
	input_free_device(input_dev);
	kfree(ts);
	return error;
}

static int __devexit tsc2005_remove(struct spi_device *spi)
{
	struct tsc2005 *ts = spi_get_drvdata(spi);

	sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);

	free_irq(ts->spi->irq, ts);
	input_unregister_device(ts->idev);
	kfree(ts);

	spi_set_drvdata(spi, NULL);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tsc2005_suspend(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);

	mutex_lock(&ts->mutex);

	if (!ts->suspended && ts->opened)
		__tsc2005_disable(ts);

	ts->suspended = true;

	mutex_unlock(&ts->mutex);

	return 0;
}

static int tsc2005_resume(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct tsc2005 *ts = spi_get_drvdata(spi);

	mutex_lock(&ts->mutex);

	if (ts->suspended && ts->opened)
		__tsc2005_enable(ts);

	ts->suspended = false;

	mutex_unlock(&ts->mutex);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);

static struct spi_driver tsc2005_driver = {
	.driver	= {
		.name	= "tsc2005",
		.owner	= THIS_MODULE,
		.pm	= &tsc2005_pm_ops,
	},
	.probe	= tsc2005_probe,
	.remove	= __devexit_p(tsc2005_remove),
};

module_spi_driver(tsc2005_driver);

MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
MODULE_LICENSE("GPL");