1/*
  2 * TSC2005 touchscreen driver
  3 *
  4 * Copyright (C) 2006-2010 Nokia Corporation
 
 
  5 *
  6 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
  7 * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License as published by
 11 * the Free Software Foundation; either version 2 of the License, or
 12 * (at your option) any later version.
 13 *
 14 * This program is distributed in the hope that it will be useful,
 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 17 * GNU General Public License for more details.
 18 *
 19 * You should have received a copy of the GNU General Public License
 20 * along with this program; if not, write to the Free Software
 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 22 *
 23 */
 24
 25#include <linux/kernel.h>
 26#include <linux/module.h>
 27#include <linux/input.h>
 28#include <linux/interrupt.h>
 29#include <linux/delay.h>
 30#include <linux/pm.h>
 31#include <linux/spi/spi.h>
 32#include <linux/spi/tsc2005.h>
 33
 34/*
 35 * The touchscreen interface operates as follows:
 36 *
 37 * 1) Pen is pressed against the touchscreen.
 38 * 2) TSC2005 performs AD conversion.
 39 * 3) After the conversion is done TSC2005 drives DAV line down.
 40 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
 41 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
 42 *    values.
 43 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
 44 *    tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
 45 * 7) When the penup timer expires, there have not been touch or DAV interrupts
 46 *    during the last 40ms which means the pen has been lifted.
 47 *
 48 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
 49 * after a configurable period (in ms) of activity. If esd_timeout is 0, the
 50 * watchdog is disabled.
 51 */
 52
 53/* control byte 1 */
 54#define TSC2005_CMD			0x80
 55#define TSC2005_CMD_NORMAL		0x00
 56#define TSC2005_CMD_STOP		0x01
 57#define TSC2005_CMD_12BIT		0x04
 58
 59/* control byte 0 */
 60#define TSC2005_REG_READ		0x0001
 61#define TSC2005_REG_PND0		0x0002
 62#define TSC2005_REG_X			0x0000
 63#define TSC2005_REG_Y			0x0008
 64#define TSC2005_REG_Z1			0x0010
 65#define TSC2005_REG_Z2			0x0018
 66#define TSC2005_REG_TEMP_HIGH		0x0050
 67#define TSC2005_REG_CFR0		0x0060
 68#define TSC2005_REG_CFR1		0x0068
 69#define TSC2005_REG_CFR2		0x0070
 70
 71/* configuration register 0 */
 72#define TSC2005_CFR0_PRECHARGE_276US	0x0040
 73#define TSC2005_CFR0_STABTIME_1MS	0x0300
 74#define TSC2005_CFR0_CLOCK_1MHZ		0x1000
 75#define TSC2005_CFR0_RESOLUTION12	0x2000
 76#define TSC2005_CFR0_PENMODE		0x8000
 77#define TSC2005_CFR0_INITVALUE		(TSC2005_CFR0_STABTIME_1MS    | \
 78					 TSC2005_CFR0_CLOCK_1MHZ      | \
 79					 TSC2005_CFR0_RESOLUTION12    | \
 80					 TSC2005_CFR0_PRECHARGE_276US | \
 81					 TSC2005_CFR0_PENMODE)
 82
 83/* bits common to both read and write of configuration register 0 */
 84#define	TSC2005_CFR0_RW_MASK		0x3fff
 85
 86/* configuration register 1 */
 87#define TSC2005_CFR1_BATCHDELAY_4MS	0x0003
 88#define TSC2005_CFR1_INITVALUE		TSC2005_CFR1_BATCHDELAY_4MS
 89
 90/* configuration register 2 */
 91#define TSC2005_CFR2_MAVE_Z		0x0004
 92#define TSC2005_CFR2_MAVE_Y		0x0008
 93#define TSC2005_CFR2_MAVE_X		0x0010
 94#define TSC2005_CFR2_AVG_7		0x0800
 95#define TSC2005_CFR2_MEDIUM_15		0x3000
 96#define TSC2005_CFR2_INITVALUE		(TSC2005_CFR2_MAVE_X	| \
 97					 TSC2005_CFR2_MAVE_Y	| \
 98					 TSC2005_CFR2_MAVE_Z	| \
 99					 TSC2005_CFR2_MEDIUM_15	| \
100					 TSC2005_CFR2_AVG_7)
101
102#define MAX_12BIT			0xfff
103#define TSC2005_SPI_MAX_SPEED_HZ	10000000
104#define TSC2005_PENUP_TIME_MS		40
105
106struct tsc2005_spi_rd {
107	struct spi_transfer	spi_xfer;
108	u32			spi_tx;
109	u32			spi_rx;
110};
111
112struct tsc2005 {
113	struct spi_device	*spi;
114
115	struct spi_message      spi_read_msg;
116	struct tsc2005_spi_rd	spi_x;
117	struct tsc2005_spi_rd	spi_y;
118	struct tsc2005_spi_rd	spi_z1;
119	struct tsc2005_spi_rd	spi_z2;
120
121	struct input_dev	*idev;
122	char			phys[32];
123
124	struct mutex		mutex;
125
126	/* raw copy of previous x,y,z */
127	int			in_x;
128	int			in_y;
129	int                     in_z1;
130	int			in_z2;
131
132	spinlock_t		lock;
133	struct timer_list	penup_timer;
134
135	unsigned int		esd_timeout;
136	struct delayed_work	esd_work;
137	unsigned long		last_valid_interrupt;
138
139	unsigned int		x_plate_ohm;
140
141	bool			opened;
142	bool			suspended;
143
144	bool			pen_down;
145
146	void			(*set_reset)(bool enable);
147};
148
149static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
150{
151	u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
152	struct spi_transfer xfer = {
153		.tx_buf		= &tx,
154		.len		= 1,
155		.bits_per_word	= 8,
156	};
157	struct spi_message msg;
 
158	int error;
159
160	spi_message_init(&msg);
161	spi_message_add_tail(&xfer, &msg);
162
163	error = spi_sync(ts->spi, &msg);
164	if (error) {
165		dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
166			__func__, cmd, error);
167		return error;
168	}
169
170	return 0;
171}
172
173static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
174{
175	u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
176	struct spi_transfer xfer = {
177		.tx_buf		= &tx,
178		.len		= 4,
179		.bits_per_word	= 24,
180	};
181	struct spi_message msg;
182	int error;
183
184	spi_message_init(&msg);
185	spi_message_add_tail(&xfer, &msg);
186
187	error = spi_sync(ts->spi, &msg);
188	if (error) {
189		dev_err(&ts->spi->dev,
190			"%s: failed, register: %x, value: %x, error: %d\n",
191			__func__, reg, value, error);
192		return error;
193	}
194
195	return 0;
196}
197
198static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
199{
200	memset(rd, 0, sizeof(*rd));
201
202	rd->spi_tx		   = (reg | TSC2005_REG_READ) << 16;
203	rd->spi_xfer.tx_buf	   = &rd->spi_tx;
204	rd->spi_xfer.rx_buf	   = &rd->spi_rx;
205	rd->spi_xfer.len	   = 4;
206	rd->spi_xfer.bits_per_word = 24;
207	rd->spi_xfer.cs_change	   = !last;
208}
209
210static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
211{
212	struct tsc2005_spi_rd spi_rd;
213	struct spi_message msg;
214	int error;
215
216	tsc2005_setup_read(&spi_rd, reg, true);
217
218	spi_message_init(&msg);
219	spi_message_add_tail(&spi_rd.spi_xfer, &msg);
220
221	error = spi_sync(ts->spi, &msg);
222	if (error)
223		return error;
224
225	*value = spi_rd.spi_rx;
226	return 0;
227}
228
229static void tsc2005_update_pen_state(struct tsc2005 *ts,
230				     int x, int y, int pressure)
231{
232	if (pressure) {
233		input_report_abs(ts->idev, ABS_X, x);
234		input_report_abs(ts->idev, ABS_Y, y);
235		input_report_abs(ts->idev, ABS_PRESSURE, pressure);
236		if (!ts->pen_down) {
237			input_report_key(ts->idev, BTN_TOUCH, !!pressure);
238			ts->pen_down = true;
239		}
240	} else {
241		input_report_abs(ts->idev, ABS_PRESSURE, 0);
242		if (ts->pen_down) {
243			input_report_key(ts->idev, BTN_TOUCH, 0);
244			ts->pen_down = false;
245		}
246	}
247	input_sync(ts->idev);
248	dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
249		pressure);
250}
251
252static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
253{
254	struct tsc2005 *ts = _ts;
255	unsigned long flags;
256	unsigned int pressure;
257	u32 x, y;
258	u32 z1, z2;
259	int error;
260
261	/* read the coordinates */
262	error = spi_sync(ts->spi, &ts->spi_read_msg);
263	if (unlikely(error))
264		goto out;
265
266	x = ts->spi_x.spi_rx;
267	y = ts->spi_y.spi_rx;
268	z1 = ts->spi_z1.spi_rx;
269	z2 = ts->spi_z2.spi_rx;
270
271	/* validate position */
272	if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
273		goto out;
274
275	/* Skip reading if the pressure components are out of range */
276	if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
277		goto out;
278
279       /*
280	* Skip point if this is a pen down with the exact same values as
281	* the value before pen-up - that implies SPI fed us stale data
282	*/
283	if (!ts->pen_down &&
284	    ts->in_x == x && ts->in_y == y &&
285	    ts->in_z1 == z1 && ts->in_z2 == z2) {
286		goto out;
287	}
288
289	/*
290	 * At this point we are happy we have a valid and useful reading.
291	 * Remember it for later comparisons. We may now begin downsampling.
292	 */
293	ts->in_x = x;
294	ts->in_y = y;
295	ts->in_z1 = z1;
296	ts->in_z2 = z2;
297
298	/* Compute touch pressure resistance using equation #1 */
299	pressure = x * (z2 - z1) / z1;
300	pressure = pressure * ts->x_plate_ohm / 4096;
301	if (unlikely(pressure > MAX_12BIT))
302		goto out;
303
304	spin_lock_irqsave(&ts->lock, flags);
305
306	tsc2005_update_pen_state(ts, x, y, pressure);
307	mod_timer(&ts->penup_timer,
308		  jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
309
310	spin_unlock_irqrestore(&ts->lock, flags);
311
312	ts->last_valid_interrupt = jiffies;
313out:
314	return IRQ_HANDLED;
315}
316
317static void tsc2005_penup_timer(unsigned long data)
318{
319	struct tsc2005 *ts = (struct tsc2005 *)data;
320	unsigned long flags;
321
322	spin_lock_irqsave(&ts->lock, flags);
323	tsc2005_update_pen_state(ts, 0, 0, 0);
324	spin_unlock_irqrestore(&ts->lock, flags);
325}
326
327static void tsc2005_start_scan(struct tsc2005 *ts)
328{
329	tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
330	tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
331	tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
332	tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
333}
334
335static void tsc2005_stop_scan(struct tsc2005 *ts)
336{
337	tsc2005_cmd(ts, TSC2005_CMD_STOP);
338}
339
340/* must be called with ts->mutex held */
341static void __tsc2005_disable(struct tsc2005 *ts)
342{
343	tsc2005_stop_scan(ts);
344
345	disable_irq(ts->spi->irq);
346	del_timer_sync(&ts->penup_timer);
347
348	cancel_delayed_work_sync(&ts->esd_work);
349
350	enable_irq(ts->spi->irq);
351}
352
353/* must be called with ts->mutex held */
354static void __tsc2005_enable(struct tsc2005 *ts)
355{
356	tsc2005_start_scan(ts);
357
358	if (ts->esd_timeout && ts->set_reset) {
359		ts->last_valid_interrupt = jiffies;
360		schedule_delayed_work(&ts->esd_work,
361				round_jiffies_relative(
362					msecs_to_jiffies(ts->esd_timeout)));
363	}
364
365}
366
367static ssize_t tsc2005_selftest_show(struct device *dev,
368				     struct device_attribute *attr,
369				     char *buf)
370{
371	struct spi_device *spi = to_spi_device(dev);
372	struct tsc2005 *ts = spi_get_drvdata(spi);
373	u16 temp_high;
374	u16 temp_high_orig;
375	u16 temp_high_test;
376	bool success = true;
377	int error;
378
379	mutex_lock(&ts->mutex);
380
381	/*
382	 * Test TSC2005 communications via temp high register.
383	 */
384	__tsc2005_disable(ts);
385
386	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
387	if (error) {
388		dev_warn(dev, "selftest failed: read error %d\n", error);
389		success = false;
390		goto out;
391	}
392
393	temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
394
395	error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
396	if (error) {
397		dev_warn(dev, "selftest failed: write error %d\n", error);
398		success = false;
399		goto out;
400	}
401
402	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
403	if (error) {
404		dev_warn(dev, "selftest failed: read error %d after write\n",
405			 error);
406		success = false;
407		goto out;
408	}
409
410	if (temp_high != temp_high_test) {
411		dev_warn(dev, "selftest failed: %d != %d\n",
412			 temp_high, temp_high_test);
413		success = false;
414	}
415
416	/* hardware reset */
417	ts->set_reset(false);
418	usleep_range(100, 500); /* only 10us required */
419	ts->set_reset(true);
420
421	if (!success)
422		goto out;
423
424	/* test that the reset really happened */
425	error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
426	if (error) {
427		dev_warn(dev, "selftest failed: read error %d after reset\n",
428			 error);
429		success = false;
430		goto out;
431	}
432
433	if (temp_high != temp_high_orig) {
434		dev_warn(dev, "selftest failed after reset: %d != %d\n",
435			 temp_high, temp_high_orig);
436		success = false;
437	}
438
439out:
440	__tsc2005_enable(ts);
441	mutex_unlock(&ts->mutex);
442
443	return sprintf(buf, "%d\n", success);
444}
445
446static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
447
448static struct attribute *tsc2005_attrs[] = {
449	&dev_attr_selftest.attr,
450	NULL
451};
452
453static mode_t tsc2005_attr_is_visible(struct kobject *kobj,
454				      struct attribute *attr, int n)
455{
456	struct device *dev = container_of(kobj, struct device, kobj);
457	struct spi_device *spi = to_spi_device(dev);
458	struct tsc2005 *ts = spi_get_drvdata(spi);
459	mode_t mode = attr->mode;
460
461	if (attr == &dev_attr_selftest.attr) {
462		if (!ts->set_reset)
463			mode = 0;
464	}
465
466	return mode;
467}
468
469static const struct attribute_group tsc2005_attr_group = {
470	.is_visible	= tsc2005_attr_is_visible,
471	.attrs		= tsc2005_attrs,
472};
473
474static void tsc2005_esd_work(struct work_struct *work)
475{
476	struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
477	int error;
478	u16 r;
479
480	if (!mutex_trylock(&ts->mutex)) {
481		/*
482		 * If the mutex is taken, it means that disable or enable is in
483		 * progress. In that case just reschedule the work. If the work
484		 * is not needed, it will be canceled by disable.
485		 */
486		goto reschedule;
487	}
488
489	if (time_is_after_jiffies(ts->last_valid_interrupt +
490				  msecs_to_jiffies(ts->esd_timeout)))
491		goto out;
492
493	/* We should be able to read register without disabling interrupts. */
494	error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
495	if (!error &&
496	    !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
497		goto out;
498	}
499
500	/*
501	 * If we could not read our known value from configuration register 0
502	 * then we should reset the controller as if from power-up and start
503	 * scanning again.
504	 */
505	dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
506
507	disable_irq(ts->spi->irq);
508	del_timer_sync(&ts->penup_timer);
509
510	tsc2005_update_pen_state(ts, 0, 0, 0);
511
512	ts->set_reset(false);
513	usleep_range(100, 500); /* only 10us required */
514	ts->set_reset(true);
515
516	enable_irq(ts->spi->irq);
517	tsc2005_start_scan(ts);
518
519out:
520	mutex_unlock(&ts->mutex);
521reschedule:
522	/* re-arm the watchdog */
523	schedule_delayed_work(&ts->esd_work,
524			      round_jiffies_relative(
525					msecs_to_jiffies(ts->esd_timeout)));
526}
527
528static int tsc2005_open(struct input_dev *input)
529{
530	struct tsc2005 *ts = input_get_drvdata(input);
531
532	mutex_lock(&ts->mutex);
533
534	if (!ts->suspended)
535		__tsc2005_enable(ts);
536
537	ts->opened = true;
538
539	mutex_unlock(&ts->mutex);
540
541	return 0;
542}
543
544static void tsc2005_close(struct input_dev *input)
545{
546	struct tsc2005 *ts = input_get_drvdata(input);
547
548	mutex_lock(&ts->mutex);
549
550	if (!ts->suspended)
551		__tsc2005_disable(ts);
552
553	ts->opened = false;
554
555	mutex_unlock(&ts->mutex);
556}
557
558static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
559{
560	tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
561	tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
562	tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
563	tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
564
565	spi_message_init(&ts->spi_read_msg);
566	spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
567	spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
568	spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
569	spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
570}
571
572static int __devinit tsc2005_probe(struct spi_device *spi)
573{
574	const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
575	struct tsc2005 *ts;
576	struct input_dev *input_dev;
577	unsigned int max_x, max_y, max_p;
578	unsigned int fudge_x, fudge_y, fudge_p;
579	int error;
580
581	if (!pdata) {
582		dev_dbg(&spi->dev, "no platform data\n");
583		return -ENODEV;
584	}
585
586	fudge_x	= pdata->ts_x_fudge	   ? : 4;
587	fudge_y	= pdata->ts_y_fudge	   ? : 8;
588	fudge_p	= pdata->ts_pressure_fudge ? : 2;
589	max_x	= pdata->ts_x_max	   ? : MAX_12BIT;
590	max_y	= pdata->ts_y_max	   ? : MAX_12BIT;
591	max_p	= pdata->ts_pressure_max   ? : MAX_12BIT;
592
593	if (spi->irq <= 0) {
594		dev_dbg(&spi->dev, "no irq\n");
595		return -ENODEV;
596	}
597
598	spi->mode = SPI_MODE_0;
599	spi->bits_per_word = 8;
600	if (!spi->max_speed_hz)
601		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
602
603	error = spi_setup(spi);
604	if (error)
605		return error;
606
607	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
608	input_dev = input_allocate_device();
609	if (!ts || !input_dev) {
610		error = -ENOMEM;
611		goto err_free_mem;
612	}
613
614	ts->spi = spi;
615	ts->idev = input_dev;
616
617	ts->x_plate_ohm	= pdata->ts_x_plate_ohm	? : 280;
618	ts->esd_timeout	= pdata->esd_timeout_ms;
619	ts->set_reset	= pdata->set_reset;
620
621	mutex_init(&ts->mutex);
622
623	spin_lock_init(&ts->lock);
624	setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
625
626	INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
627
628	tsc2005_setup_spi_xfer(ts);
629
630	snprintf(ts->phys, sizeof(ts->phys),
631		 "%s/input-ts", dev_name(&spi->dev));
632
633	input_dev->name = "TSC2005 touchscreen";
634	input_dev->phys = ts->phys;
635	input_dev->id.bustype = BUS_SPI;
636	input_dev->dev.parent = &spi->dev;
637	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
638	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
639
640	input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
641	input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
642	input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
643
644	input_dev->open = tsc2005_open;
645	input_dev->close = tsc2005_close;
646
647	input_set_drvdata(input_dev, ts);
648
649	/* Ensure the touchscreen is off */
650	tsc2005_stop_scan(ts);
651
652	error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
653				     IRQF_TRIGGER_RISING, "tsc2005", ts);
654	if (error) {
655		dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
656		goto err_free_mem;
657	}
658
659	spi_set_drvdata(spi, ts);
660	error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
661	if (error) {
662		dev_err(&spi->dev,
663			"Failed to create sysfs attributes, err: %d\n", error);
664		goto err_clear_drvdata;
665	}
666
667	error = input_register_device(ts->idev);
668	if (error) {
669		dev_err(&spi->dev,
670			"Failed to register input device, err: %d\n", error);
671		goto err_remove_sysfs;
672	}
673
674	irq_set_irq_wake(spi->irq, 1);
675	return 0;
676
677err_remove_sysfs:
678	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
679err_clear_drvdata:
680	spi_set_drvdata(spi, NULL);
681	free_irq(spi->irq, ts);
682err_free_mem:
683	input_free_device(input_dev);
684	kfree(ts);
685	return error;
686}
687
688static int __devexit tsc2005_remove(struct spi_device *spi)
689{
690	struct tsc2005 *ts = spi_get_drvdata(spi);
691
692	sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
693
694	free_irq(ts->spi->irq, ts);
695	input_unregister_device(ts->idev);
696	kfree(ts);
697
698	spi_set_drvdata(spi, NULL);
699	return 0;
700}
701
702#ifdef CONFIG_PM_SLEEP
703static int tsc2005_suspend(struct device *dev)
704{
705	struct spi_device *spi = to_spi_device(dev);
706	struct tsc2005 *ts = spi_get_drvdata(spi);
707
708	mutex_lock(&ts->mutex);
709
710	if (!ts->suspended && ts->opened)
711		__tsc2005_disable(ts);
712
713	ts->suspended = true;
714
715	mutex_unlock(&ts->mutex);
716
717	return 0;
718}
719
720static int tsc2005_resume(struct device *dev)
721{
722	struct spi_device *spi = to_spi_device(dev);
723	struct tsc2005 *ts = spi_get_drvdata(spi);
724
725	mutex_lock(&ts->mutex);
726
727	if (ts->suspended && ts->opened)
728		__tsc2005_enable(ts);
729
730	ts->suspended = false;
731
732	mutex_unlock(&ts->mutex);
733
734	return 0;
735}
736#endif
737
738static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
739
740static struct spi_driver tsc2005_driver = {
741	.driver	= {
742		.name	= "tsc2005",
743		.owner	= THIS_MODULE,
744		.pm	= &tsc2005_pm_ops,
 
745	},
746	.probe	= tsc2005_probe,
747	.remove	= __devexit_p(tsc2005_remove),
748};
 
749
750static int __init tsc2005_init(void)
751{
752	return spi_register_driver(&tsc2005_driver);
753}
754module_init(tsc2005_init);
755
756static void __exit tsc2005_exit(void)
757{
758	spi_unregister_driver(&tsc2005_driver);
759}
760module_exit(tsc2005_exit);
761
762MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
763MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
764MODULE_LICENSE("GPL");