xref: /linux/drivers/input/touchscreen/auo-pixcir-ts.c (revision ca55b2fef3a9373fcfc30f82fd26bc7fccbda732) 
1 /*
2  * Driver for AUO in-cell touchscreens
3  *
4  * Copyright (c) 2011 Heiko Stuebner <heiko@sntech.de>
5  *
6  * loosely based on auo_touch.c from Dell Streak vendor-kernel
7  *
8  * Copyright (c) 2008 QUALCOMM Incorporated.
9  * Copyright (c) 2008 QUALCOMM USA, INC.
10  *
11  *
12  * This software is licensed under the terms of the GNU General Public
13  * License version 2, as published by the Free Software Foundation, and
14  * may be copied, distributed, and modified under those terms.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  */
22 
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/interrupt.h>
26 #include <linux/slab.h>
27 #include <linux/input.h>
28 #include <linux/jiffies.h>
29 #include <linux/i2c.h>
30 #include <linux/mutex.h>
31 #include <linux/delay.h>
32 #include <linux/gpio.h>
33 #include <linux/input/auo-pixcir-ts.h>
34 #include <linux/of.h>
35 #include <linux/of_gpio.h>
36 
37 /*
38  * Coordinate calculation:
39  * X1 = X1_LSB + X1_MSB*256
40  * Y1 = Y1_LSB + Y1_MSB*256
41  * X2 = X2_LSB + X2_MSB*256
42  * Y2 = Y2_LSB + Y2_MSB*256
43  */
44 #define AUO_PIXCIR_REG_X1_LSB		0x00
45 #define AUO_PIXCIR_REG_X1_MSB		0x01
46 #define AUO_PIXCIR_REG_Y1_LSB		0x02
47 #define AUO_PIXCIR_REG_Y1_MSB		0x03
48 #define AUO_PIXCIR_REG_X2_LSB		0x04
49 #define AUO_PIXCIR_REG_X2_MSB		0x05
50 #define AUO_PIXCIR_REG_Y2_LSB		0x06
51 #define AUO_PIXCIR_REG_Y2_MSB		0x07
52 
53 #define AUO_PIXCIR_REG_STRENGTH		0x0d
54 #define AUO_PIXCIR_REG_STRENGTH_X1_LSB	0x0e
55 #define AUO_PIXCIR_REG_STRENGTH_X1_MSB	0x0f
56 
57 #define AUO_PIXCIR_REG_RAW_DATA_X	0x2b
58 #define AUO_PIXCIR_REG_RAW_DATA_Y	0x4f
59 
60 #define AUO_PIXCIR_REG_X_SENSITIVITY	0x6f
61 #define AUO_PIXCIR_REG_Y_SENSITIVITY	0x70
62 #define AUO_PIXCIR_REG_INT_SETTING	0x71
63 #define AUO_PIXCIR_REG_INT_WIDTH	0x72
64 #define AUO_PIXCIR_REG_POWER_MODE	0x73
65 
66 #define AUO_PIXCIR_REG_VERSION		0x77
67 #define AUO_PIXCIR_REG_CALIBRATE	0x78
68 
69 #define AUO_PIXCIR_REG_TOUCHAREA_X1	0x1e
70 #define AUO_PIXCIR_REG_TOUCHAREA_Y1	0x1f
71 #define AUO_PIXCIR_REG_TOUCHAREA_X2	0x20
72 #define AUO_PIXCIR_REG_TOUCHAREA_Y2	0x21
73 
74 #define AUO_PIXCIR_REG_EEPROM_CALIB_X	0x42
75 #define AUO_PIXCIR_REG_EEPROM_CALIB_Y	0xad
76 
77 #define AUO_PIXCIR_INT_TPNUM_MASK	0xe0
78 #define AUO_PIXCIR_INT_TPNUM_SHIFT	5
79 #define AUO_PIXCIR_INT_RELEASE		(1 << 4)
80 #define AUO_PIXCIR_INT_ENABLE		(1 << 3)
81 #define AUO_PIXCIR_INT_POL_HIGH		(1 << 2)
82 #define AUO_PIXCIR_INT_MODE_MASK	0x03
83 
84 /*
85  * Power modes:
86  * active:	scan speed 60Hz
87  * sleep:	scan speed 10Hz can be auto-activated, wakeup on 1st touch
88  * deep sleep:	scan speed 1Hz can only be entered or left manually.
89  */
90 #define AUO_PIXCIR_POWER_ACTIVE		0x00
91 #define AUO_PIXCIR_POWER_SLEEP		0x01
92 #define AUO_PIXCIR_POWER_DEEP_SLEEP	0x02
93 #define AUO_PIXCIR_POWER_MASK		0x03
94 
95 #define AUO_PIXCIR_POWER_ALLOW_SLEEP	(1 << 2)
96 #define AUO_PIXCIR_POWER_IDLE_TIME(ms)	((ms & 0xf) << 4)
97 
98 #define AUO_PIXCIR_CALIBRATE		0x03
99 
100 #define AUO_PIXCIR_EEPROM_CALIB_X_LEN	62
101 #define AUO_PIXCIR_EEPROM_CALIB_Y_LEN	36
102 
103 #define AUO_PIXCIR_RAW_DATA_X_LEN	18
104 #define AUO_PIXCIR_RAW_DATA_Y_LEN	11
105 
106 #define AUO_PIXCIR_STRENGTH_ENABLE	(1 << 0)
107 
108 /* Touchscreen absolute values */
109 #define AUO_PIXCIR_REPORT_POINTS	2
110 #define AUO_PIXCIR_MAX_AREA		0xff
111 #define AUO_PIXCIR_PENUP_TIMEOUT_MS	10
112 
113 struct auo_pixcir_ts {
114 	struct i2c_client	*client;
115 	struct input_dev	*input;
116 	const struct auo_pixcir_ts_platdata *pdata;
117 	char			phys[32];
118 
119 	/* special handling for touch_indicate interupt mode */
120 	bool			touch_ind_mode;
121 
122 	wait_queue_head_t	wait;
123 	bool			stopped;
124 };
125 
126 struct auo_point_t {
127 	int	coord_x;
128 	int	coord_y;
129 	int	area_major;
130 	int	area_minor;
131 	int	orientation;
132 };
133 
134 static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
135 				   struct auo_point_t *point)
136 {
137 	struct i2c_client *client = ts->client;
138 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
139 	uint8_t raw_coord[8];
140 	uint8_t raw_area[4];
141 	int i, ret;
142 
143 	/* touch coordinates */
144 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
145 					    8, raw_coord);
146 	if (ret < 0) {
147 		dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
148 		return ret;
149 	}
150 
151 	/* touch area */
152 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
153 					    4, raw_area);
154 	if (ret < 0) {
155 		dev_err(&client->dev, "could not read touch area, %d\n", ret);
156 		return ret;
157 	}
158 
159 	for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
160 		point[i].coord_x =
161 			raw_coord[4 * i + 1] << 8 | raw_coord[4 * i];
162 		point[i].coord_y =
163 			raw_coord[4 * i + 3] << 8 | raw_coord[4 * i + 2];
164 
165 		if (point[i].coord_x > pdata->x_max ||
166 		    point[i].coord_y > pdata->y_max) {
167 			dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
168 				point[i].coord_x, point[i].coord_y);
169 			point[i].coord_x = point[i].coord_y = 0;
170 		}
171 
172 		/* determine touch major, minor and orientation */
173 		point[i].area_major = max(raw_area[2 * i], raw_area[2 * i + 1]);
174 		point[i].area_minor = min(raw_area[2 * i], raw_area[2 * i + 1]);
175 		point[i].orientation = raw_area[2 * i] > raw_area[2 * i + 1];
176 	}
177 
178 	return 0;
179 }
180 
181 static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
182 {
183 	struct auo_pixcir_ts *ts = dev_id;
184 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
185 	struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
186 	int i;
187 	int ret;
188 	int fingers = 0;
189 	int abs = -1;
190 
191 	while (!ts->stopped) {
192 
193 		/* check for up event in touch touch_ind_mode */
194 		if (ts->touch_ind_mode) {
195 			if (gpio_get_value(pdata->gpio_int) == 0) {
196 				input_mt_sync(ts->input);
197 				input_report_key(ts->input, BTN_TOUCH, 0);
198 				input_sync(ts->input);
199 				break;
200 			}
201 		}
202 
203 		ret = auo_pixcir_collect_data(ts, point);
204 		if (ret < 0) {
205 			/* we want to loop only in touch_ind_mode */
206 			if (!ts->touch_ind_mode)
207 				break;
208 
209 			wait_event_timeout(ts->wait, ts->stopped,
210 				msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
211 			continue;
212 		}
213 
214 		for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
215 			if (point[i].coord_x > 0 || point[i].coord_y > 0) {
216 				input_report_abs(ts->input, ABS_MT_POSITION_X,
217 						 point[i].coord_x);
218 				input_report_abs(ts->input, ABS_MT_POSITION_Y,
219 						 point[i].coord_y);
220 				input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
221 						 point[i].area_major);
222 				input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
223 						 point[i].area_minor);
224 				input_report_abs(ts->input, ABS_MT_ORIENTATION,
225 						 point[i].orientation);
226 				input_mt_sync(ts->input);
227 
228 				/* use first finger as source for singletouch */
229 				if (fingers == 0)
230 					abs = i;
231 
232 				/* number of touch points could also be queried
233 				 * via i2c but would require an additional call
234 				 */
235 				fingers++;
236 			}
237 		}
238 
239 		input_report_key(ts->input, BTN_TOUCH, fingers > 0);
240 
241 		if (abs > -1) {
242 			input_report_abs(ts->input, ABS_X, point[abs].coord_x);
243 			input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
244 		}
245 
246 		input_sync(ts->input);
247 
248 		/* we want to loop only in touch_ind_mode */
249 		if (!ts->touch_ind_mode)
250 			break;
251 
252 		wait_event_timeout(ts->wait, ts->stopped,
253 				 msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
254 	}
255 
256 	return IRQ_HANDLED;
257 }
258 
259 /*
260  * Set the power mode of the device.
261  * Valid modes are
262  * - AUO_PIXCIR_POWER_ACTIVE
263  * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
264  * - AUO_PIXCIR_POWER_DEEP_SLEEP
265  */
266 static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
267 {
268 	struct i2c_client *client = ts->client;
269 	int ret;
270 
271 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
272 	if (ret < 0) {
273 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
274 			AUO_PIXCIR_REG_POWER_MODE, ret);
275 		return ret;
276 	}
277 
278 	ret &= ~AUO_PIXCIR_POWER_MASK;
279 	ret |= mode;
280 
281 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
282 	if (ret) {
283 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
284 			AUO_PIXCIR_REG_POWER_MODE, ret);
285 		return ret;
286 	}
287 
288 	return 0;
289 }
290 
291 static int auo_pixcir_int_config(struct auo_pixcir_ts *ts,
292 					   int int_setting)
293 {
294 	struct i2c_client *client = ts->client;
295 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
296 	int ret;
297 
298 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
299 	if (ret < 0) {
300 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
301 			AUO_PIXCIR_REG_INT_SETTING, ret);
302 		return ret;
303 	}
304 
305 	ret &= ~AUO_PIXCIR_INT_MODE_MASK;
306 	ret |= int_setting;
307 	ret |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
308 
309 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
310 					ret);
311 	if (ret < 0) {
312 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
313 			AUO_PIXCIR_REG_INT_SETTING, ret);
314 		return ret;
315 	}
316 
317 	ts->touch_ind_mode = pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND;
318 
319 	return 0;
320 }
321 
322 /* control the generation of interrupts on the device side */
323 static int auo_pixcir_int_toggle(struct auo_pixcir_ts *ts, bool enable)
324 {
325 	struct i2c_client *client = ts->client;
326 	int ret;
327 
328 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
329 	if (ret < 0) {
330 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
331 			AUO_PIXCIR_REG_INT_SETTING, ret);
332 		return ret;
333 	}
334 
335 	if (enable)
336 		ret |= AUO_PIXCIR_INT_ENABLE;
337 	else
338 		ret &= ~AUO_PIXCIR_INT_ENABLE;
339 
340 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
341 					ret);
342 	if (ret < 0) {
343 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
344 			AUO_PIXCIR_REG_INT_SETTING, ret);
345 		return ret;
346 	}
347 
348 	return 0;
349 }
350 
351 static int auo_pixcir_start(struct auo_pixcir_ts *ts)
352 {
353 	struct i2c_client *client = ts->client;
354 	int ret;
355 
356 	ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_ACTIVE);
357 	if (ret < 0) {
358 		dev_err(&client->dev, "could not set power mode, %d\n",
359 			ret);
360 		return ret;
361 	}
362 
363 	ts->stopped = false;
364 	mb();
365 	enable_irq(client->irq);
366 
367 	ret = auo_pixcir_int_toggle(ts, 1);
368 	if (ret < 0) {
369 		dev_err(&client->dev, "could not enable interrupt, %d\n",
370 			ret);
371 		disable_irq(client->irq);
372 		return ret;
373 	}
374 
375 	return 0;
376 }
377 
378 static int auo_pixcir_stop(struct auo_pixcir_ts *ts)
379 {
380 	struct i2c_client *client = ts->client;
381 	int ret;
382 
383 	ret = auo_pixcir_int_toggle(ts, 0);
384 	if (ret < 0) {
385 		dev_err(&client->dev, "could not disable interrupt, %d\n",
386 			ret);
387 		return ret;
388 	}
389 
390 	/* disable receiving of interrupts */
391 	disable_irq(client->irq);
392 	ts->stopped = true;
393 	mb();
394 	wake_up(&ts->wait);
395 
396 	return auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_DEEP_SLEEP);
397 }
398 
399 static int auo_pixcir_input_open(struct input_dev *dev)
400 {
401 	struct auo_pixcir_ts *ts = input_get_drvdata(dev);
402 	int ret;
403 
404 	ret = auo_pixcir_start(ts);
405 	if (ret)
406 		return ret;
407 
408 	return 0;
409 }
410 
411 static void auo_pixcir_input_close(struct input_dev *dev)
412 {
413 	struct auo_pixcir_ts *ts = input_get_drvdata(dev);
414 
415 	auo_pixcir_stop(ts);
416 
417 	return;
418 }
419 
420 static int __maybe_unused auo_pixcir_suspend(struct device *dev)
421 {
422 	struct i2c_client *client = to_i2c_client(dev);
423 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
424 	struct input_dev *input = ts->input;
425 	int ret = 0;
426 
427 	mutex_lock(&input->mutex);
428 
429 	/* when configured as wakeup source, device should always wake system
430 	 * therefore start device if necessary
431 	 */
432 	if (device_may_wakeup(&client->dev)) {
433 		/* need to start device if not open, to be wakeup source */
434 		if (!input->users) {
435 			ret = auo_pixcir_start(ts);
436 			if (ret)
437 				goto unlock;
438 		}
439 
440 		enable_irq_wake(client->irq);
441 		ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
442 	} else if (input->users) {
443 		ret = auo_pixcir_stop(ts);
444 	}
445 
446 unlock:
447 	mutex_unlock(&input->mutex);
448 
449 	return ret;
450 }
451 
452 static int __maybe_unused auo_pixcir_resume(struct device *dev)
453 {
454 	struct i2c_client *client = to_i2c_client(dev);
455 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
456 	struct input_dev *input = ts->input;
457 	int ret = 0;
458 
459 	mutex_lock(&input->mutex);
460 
461 	if (device_may_wakeup(&client->dev)) {
462 		disable_irq_wake(client->irq);
463 
464 		/* need to stop device if it was not open on suspend */
465 		if (!input->users) {
466 			ret = auo_pixcir_stop(ts);
467 			if (ret)
468 				goto unlock;
469 		}
470 
471 		/* device wakes automatically from SLEEP */
472 	} else if (input->users) {
473 		ret = auo_pixcir_start(ts);
474 	}
475 
476 unlock:
477 	mutex_unlock(&input->mutex);
478 
479 	return ret;
480 }
481 
482 static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
483 			 auo_pixcir_suspend, auo_pixcir_resume);
484 
485 #ifdef CONFIG_OF
486 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
487 {
488 	struct auo_pixcir_ts_platdata *pdata;
489 	struct device_node *np = dev->of_node;
490 
491 	if (!np)
492 		return ERR_PTR(-ENOENT);
493 
494 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
495 	if (!pdata) {
496 		dev_err(dev, "failed to allocate platform data\n");
497 		return ERR_PTR(-ENOMEM);
498 	}
499 
500 	pdata->gpio_int = of_get_gpio(np, 0);
501 	if (!gpio_is_valid(pdata->gpio_int)) {
502 		dev_err(dev, "failed to get interrupt gpio\n");
503 		return ERR_PTR(-EINVAL);
504 	}
505 
506 	pdata->gpio_rst = of_get_gpio(np, 1);
507 	if (!gpio_is_valid(pdata->gpio_rst)) {
508 		dev_err(dev, "failed to get reset gpio\n");
509 		return ERR_PTR(-EINVAL);
510 	}
511 
512 	if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
513 		dev_err(dev, "failed to get x-size property\n");
514 		return ERR_PTR(-EINVAL);
515 	}
516 
517 	if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
518 		dev_err(dev, "failed to get y-size property\n");
519 		return ERR_PTR(-EINVAL);
520 	}
521 
522 	/* default to asserting the interrupt when the screen is touched */
523 	pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
524 
525 	return pdata;
526 }
527 #else
528 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
529 {
530 	return ERR_PTR(-EINVAL);
531 }
532 #endif
533 
534 static void auo_pixcir_reset(void *data)
535 {
536 	struct auo_pixcir_ts *ts = data;
537 
538 	gpio_set_value(ts->pdata->gpio_rst, 0);
539 }
540 
541 static int auo_pixcir_probe(struct i2c_client *client,
542 			    const struct i2c_device_id *id)
543 {
544 	const struct auo_pixcir_ts_platdata *pdata;
545 	struct auo_pixcir_ts *ts;
546 	struct input_dev *input_dev;
547 	int version;
548 	int error;
549 
550 	pdata = dev_get_platdata(&client->dev);
551 	if (!pdata) {
552 		pdata = auo_pixcir_parse_dt(&client->dev);
553 		if (IS_ERR(pdata))
554 			return PTR_ERR(pdata);
555 	}
556 
557 	ts = devm_kzalloc(&client->dev,
558 			  sizeof(struct auo_pixcir_ts), GFP_KERNEL);
559 	if (!ts)
560 		return -ENOMEM;
561 
562 	input_dev = devm_input_allocate_device(&client->dev);
563 	if (!input_dev) {
564 		dev_err(&client->dev, "could not allocate input device\n");
565 		return -ENOMEM;
566 	}
567 
568 	ts->pdata = pdata;
569 	ts->client = client;
570 	ts->input = input_dev;
571 	ts->touch_ind_mode = 0;
572 	ts->stopped = true;
573 	init_waitqueue_head(&ts->wait);
574 
575 	snprintf(ts->phys, sizeof(ts->phys),
576 		 "%s/input0", dev_name(&client->dev));
577 
578 	input_dev->name = "AUO-Pixcir touchscreen";
579 	input_dev->phys = ts->phys;
580 	input_dev->id.bustype = BUS_I2C;
581 
582 	input_dev->open = auo_pixcir_input_open;
583 	input_dev->close = auo_pixcir_input_close;
584 
585 	__set_bit(EV_ABS, input_dev->evbit);
586 	__set_bit(EV_KEY, input_dev->evbit);
587 
588 	__set_bit(BTN_TOUCH, input_dev->keybit);
589 
590 	/* For single touch */
591 	input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
592 	input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
593 
594 	/* For multi touch */
595 	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
596 			     pdata->x_max, 0, 0);
597 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
598 			     pdata->y_max, 0, 0);
599 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
600 			     AUO_PIXCIR_MAX_AREA, 0, 0);
601 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
602 			     AUO_PIXCIR_MAX_AREA, 0, 0);
603 	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
604 
605 	input_set_drvdata(ts->input, ts);
606 
607 	error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
608 				      GPIOF_DIR_IN, "auo_pixcir_ts_int");
609 	if (error) {
610 		dev_err(&client->dev, "request of gpio %d failed, %d\n",
611 			pdata->gpio_int, error);
612 		return error;
613 	}
614 
615 	error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
616 				      GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
617 				      "auo_pixcir_ts_rst");
618 	if (error) {
619 		dev_err(&client->dev, "request of gpio %d failed, %d\n",
620 			pdata->gpio_rst, error);
621 		return error;
622 	}
623 
624 	error = devm_add_action(&client->dev, auo_pixcir_reset, ts);
625 	if (error) {
626 		auo_pixcir_reset(ts);
627 		dev_err(&client->dev, "failed to register reset action, %d\n",
628 			error);
629 		return error;
630 	}
631 
632 	msleep(200);
633 
634 	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
635 	if (version < 0) {
636 		error = version;
637 		return error;
638 	}
639 
640 	dev_info(&client->dev, "firmware version 0x%X\n", version);
641 
642 	error = auo_pixcir_int_config(ts, pdata->int_setting);
643 	if (error)
644 		return error;
645 
646 	error = devm_request_threaded_irq(&client->dev, client->irq,
647 					  NULL, auo_pixcir_interrupt,
648 					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
649 					  input_dev->name, ts);
650 	if (error) {
651 		dev_err(&client->dev, "irq %d requested failed, %d\n",
652 			client->irq, error);
653 		return error;
654 	}
655 
656 	/* stop device and put it into deep sleep until it is opened */
657 	error = auo_pixcir_stop(ts);
658 	if (error)
659 		return error;
660 
661 	error = input_register_device(input_dev);
662 	if (error) {
663 		dev_err(&client->dev, "could not register input device, %d\n",
664 			error);
665 		return error;
666 	}
667 
668 	i2c_set_clientdata(client, ts);
669 
670 	return 0;
671 }
672 
673 static const struct i2c_device_id auo_pixcir_idtable[] = {
674 	{ "auo_pixcir_ts", 0 },
675 	{ }
676 };
677 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
678 
679 #ifdef CONFIG_OF
680 static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
681 	{ .compatible = "auo,auo_pixcir_ts" },
682 	{},
683 };
684 MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
685 #endif
686 
687 static struct i2c_driver auo_pixcir_driver = {
688 	.driver = {
689 		.name	= "auo_pixcir_ts",
690 		.pm	= &auo_pixcir_pm_ops,
691 		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
692 	},
693 	.probe		= auo_pixcir_probe,
694 	.id_table	= auo_pixcir_idtable,
695 };
696 
697 module_i2c_driver(auo_pixcir_driver);
698 
699 MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
700 MODULE_LICENSE("GPL v2");
701 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
702