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 
106 struct tsc2005_spi_rd {
107 	struct spi_transfer	spi_xfer;
108 	u32			spi_tx;
109 	u32			spi_rx;
110 };
111 
112 struct 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 
149 static 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 
173 static 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 
198 static 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 
210 static 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 
229 static 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 
252 static 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;
313 out:
314 	return IRQ_HANDLED;
315 }
316 
317 static 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 
327 static 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 
335 static 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 */
341 static 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 */
354 static 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 
367 static 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 
439 out:
440 	__tsc2005_enable(ts);
441 	mutex_unlock(&ts->mutex);
442 
443 	return sprintf(buf, "%d\n", success);
444 }
445 
446 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
447 
448 static struct attribute *tsc2005_attrs[] = {
449 	&dev_attr_selftest.attr,
450 	NULL
451 };
452 
453 static umode_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 	umode_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 
469 static const struct attribute_group tsc2005_attr_group = {
470 	.is_visible	= tsc2005_attr_is_visible,
471 	.attrs		= tsc2005_attrs,
472 };
473 
474 static 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 
519 out:
520 	mutex_unlock(&ts->mutex);
521 reschedule:
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 
528 static 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 
544 static 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 
558 static void 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 
572 static int tsc2005_probe(struct spi_device *spi)
573 {
574 	const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
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 | IRQF_ONESHOT,
654 				     "tsc2005", ts);
655 	if (error) {
656 		dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
657 		goto err_free_mem;
658 	}
659 
660 	spi_set_drvdata(spi, ts);
661 	error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
662 	if (error) {
663 		dev_err(&spi->dev,
664 			"Failed to create sysfs attributes, err: %d\n", error);
665 		goto err_clear_drvdata;
666 	}
667 
668 	error = input_register_device(ts->idev);
669 	if (error) {
670 		dev_err(&spi->dev,
671 			"Failed to register input device, err: %d\n", error);
672 		goto err_remove_sysfs;
673 	}
674 
675 	irq_set_irq_wake(spi->irq, 1);
676 	return 0;
677 
678 err_remove_sysfs:
679 	sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
680 err_clear_drvdata:
681 	free_irq(spi->irq, ts);
682 err_free_mem:
683 	input_free_device(input_dev);
684 	kfree(ts);
685 	return error;
686 }
687 
688 static int 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 	return 0;
699 }
700 
701 #ifdef CONFIG_PM_SLEEP
702 static int tsc2005_suspend(struct device *dev)
703 {
704 	struct spi_device *spi = to_spi_device(dev);
705 	struct tsc2005 *ts = spi_get_drvdata(spi);
706 
707 	mutex_lock(&ts->mutex);
708 
709 	if (!ts->suspended && ts->opened)
710 		__tsc2005_disable(ts);
711 
712 	ts->suspended = true;
713 
714 	mutex_unlock(&ts->mutex);
715 
716 	return 0;
717 }
718 
719 static int tsc2005_resume(struct device *dev)
720 {
721 	struct spi_device *spi = to_spi_device(dev);
722 	struct tsc2005 *ts = spi_get_drvdata(spi);
723 
724 	mutex_lock(&ts->mutex);
725 
726 	if (ts->suspended && ts->opened)
727 		__tsc2005_enable(ts);
728 
729 	ts->suspended = false;
730 
731 	mutex_unlock(&ts->mutex);
732 
733 	return 0;
734 }
735 #endif
736 
737 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
738 
739 static struct spi_driver tsc2005_driver = {
740 	.driver	= {
741 		.name	= "tsc2005",
742 		.owner	= THIS_MODULE,
743 		.pm	= &tsc2005_pm_ops,
744 	},
745 	.probe	= tsc2005_probe,
746 	.remove	= tsc2005_remove,
747 };
748 
749 module_spi_driver(tsc2005_driver);
750 
751 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
752 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
753 MODULE_LICENSE("GPL");
754 MODULE_ALIAS("spi:tsc2005");
755