xref: /linux/drivers/input/touchscreen/auo-pixcir-ts.c (revision da1d9caf95def6f0320819cf941c9fd1069ba9e1) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Driver for AUO in-cell touchscreens
4  *
5  * Copyright (c) 2011 Heiko Stuebner <heiko@sntech.de>
6  *
7  * loosely based on auo_touch.c from Dell Streak vendor-kernel
8  *
9  * Copyright (c) 2008 QUALCOMM Incorporated.
10  * Copyright (c) 2008 QUALCOMM USA, INC.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/input.h>
18 #include <linux/jiffies.h>
19 #include <linux/i2c.h>
20 #include <linux/mutex.h>
21 #include <linux/delay.h>
22 #include <linux/gpio.h>
23 #include <linux/input/auo-pixcir-ts.h>
24 #include <linux/of.h>
25 #include <linux/of_gpio.h>
26 
27 /*
28  * Coordinate calculation:
29  * X1 = X1_LSB + X1_MSB*256
30  * Y1 = Y1_LSB + Y1_MSB*256
31  * X2 = X2_LSB + X2_MSB*256
32  * Y2 = Y2_LSB + Y2_MSB*256
33  */
34 #define AUO_PIXCIR_REG_X1_LSB		0x00
35 #define AUO_PIXCIR_REG_X1_MSB		0x01
36 #define AUO_PIXCIR_REG_Y1_LSB		0x02
37 #define AUO_PIXCIR_REG_Y1_MSB		0x03
38 #define AUO_PIXCIR_REG_X2_LSB		0x04
39 #define AUO_PIXCIR_REG_X2_MSB		0x05
40 #define AUO_PIXCIR_REG_Y2_LSB		0x06
41 #define AUO_PIXCIR_REG_Y2_MSB		0x07
42 
43 #define AUO_PIXCIR_REG_STRENGTH		0x0d
44 #define AUO_PIXCIR_REG_STRENGTH_X1_LSB	0x0e
45 #define AUO_PIXCIR_REG_STRENGTH_X1_MSB	0x0f
46 
47 #define AUO_PIXCIR_REG_RAW_DATA_X	0x2b
48 #define AUO_PIXCIR_REG_RAW_DATA_Y	0x4f
49 
50 #define AUO_PIXCIR_REG_X_SENSITIVITY	0x6f
51 #define AUO_PIXCIR_REG_Y_SENSITIVITY	0x70
52 #define AUO_PIXCIR_REG_INT_SETTING	0x71
53 #define AUO_PIXCIR_REG_INT_WIDTH	0x72
54 #define AUO_PIXCIR_REG_POWER_MODE	0x73
55 
56 #define AUO_PIXCIR_REG_VERSION		0x77
57 #define AUO_PIXCIR_REG_CALIBRATE	0x78
58 
59 #define AUO_PIXCIR_REG_TOUCHAREA_X1	0x1e
60 #define AUO_PIXCIR_REG_TOUCHAREA_Y1	0x1f
61 #define AUO_PIXCIR_REG_TOUCHAREA_X2	0x20
62 #define AUO_PIXCIR_REG_TOUCHAREA_Y2	0x21
63 
64 #define AUO_PIXCIR_REG_EEPROM_CALIB_X	0x42
65 #define AUO_PIXCIR_REG_EEPROM_CALIB_Y	0xad
66 
67 #define AUO_PIXCIR_INT_TPNUM_MASK	0xe0
68 #define AUO_PIXCIR_INT_TPNUM_SHIFT	5
69 #define AUO_PIXCIR_INT_RELEASE		(1 << 4)
70 #define AUO_PIXCIR_INT_ENABLE		(1 << 3)
71 #define AUO_PIXCIR_INT_POL_HIGH		(1 << 2)
72 #define AUO_PIXCIR_INT_MODE_MASK	0x03
73 
74 /*
75  * Power modes:
76  * active:	scan speed 60Hz
77  * sleep:	scan speed 10Hz can be auto-activated, wakeup on 1st touch
78  * deep sleep:	scan speed 1Hz can only be entered or left manually.
79  */
80 #define AUO_PIXCIR_POWER_ACTIVE		0x00
81 #define AUO_PIXCIR_POWER_SLEEP		0x01
82 #define AUO_PIXCIR_POWER_DEEP_SLEEP	0x02
83 #define AUO_PIXCIR_POWER_MASK		0x03
84 
85 #define AUO_PIXCIR_POWER_ALLOW_SLEEP	(1 << 2)
86 #define AUO_PIXCIR_POWER_IDLE_TIME(ms)	((ms & 0xf) << 4)
87 
88 #define AUO_PIXCIR_CALIBRATE		0x03
89 
90 #define AUO_PIXCIR_EEPROM_CALIB_X_LEN	62
91 #define AUO_PIXCIR_EEPROM_CALIB_Y_LEN	36
92 
93 #define AUO_PIXCIR_RAW_DATA_X_LEN	18
94 #define AUO_PIXCIR_RAW_DATA_Y_LEN	11
95 
96 #define AUO_PIXCIR_STRENGTH_ENABLE	(1 << 0)
97 
98 /* Touchscreen absolute values */
99 #define AUO_PIXCIR_REPORT_POINTS	2
100 #define AUO_PIXCIR_MAX_AREA		0xff
101 #define AUO_PIXCIR_PENUP_TIMEOUT_MS	10
102 
103 struct auo_pixcir_ts {
104 	struct i2c_client	*client;
105 	struct input_dev	*input;
106 	const struct auo_pixcir_ts_platdata *pdata;
107 	char			phys[32];
108 
109 	/* special handling for touch_indicate interupt mode */
110 	bool			touch_ind_mode;
111 
112 	wait_queue_head_t	wait;
113 	bool			stopped;
114 };
115 
116 struct auo_point_t {
117 	int	coord_x;
118 	int	coord_y;
119 	int	area_major;
120 	int	area_minor;
121 	int	orientation;
122 };
123 
124 static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
125 				   struct auo_point_t *point)
126 {
127 	struct i2c_client *client = ts->client;
128 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
129 	uint8_t raw_coord[8];
130 	uint8_t raw_area[4];
131 	int i, ret;
132 
133 	/* touch coordinates */
134 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
135 					    8, raw_coord);
136 	if (ret < 0) {
137 		dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
138 		return ret;
139 	}
140 
141 	/* touch area */
142 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
143 					    4, raw_area);
144 	if (ret < 0) {
145 		dev_err(&client->dev, "could not read touch area, %d\n", ret);
146 		return ret;
147 	}
148 
149 	for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
150 		point[i].coord_x =
151 			raw_coord[4 * i + 1] << 8 | raw_coord[4 * i];
152 		point[i].coord_y =
153 			raw_coord[4 * i + 3] << 8 | raw_coord[4 * i + 2];
154 
155 		if (point[i].coord_x > pdata->x_max ||
156 		    point[i].coord_y > pdata->y_max) {
157 			dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
158 				point[i].coord_x, point[i].coord_y);
159 			point[i].coord_x = point[i].coord_y = 0;
160 		}
161 
162 		/* determine touch major, minor and orientation */
163 		point[i].area_major = max(raw_area[2 * i], raw_area[2 * i + 1]);
164 		point[i].area_minor = min(raw_area[2 * i], raw_area[2 * i + 1]);
165 		point[i].orientation = raw_area[2 * i] > raw_area[2 * i + 1];
166 	}
167 
168 	return 0;
169 }
170 
171 static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
172 {
173 	struct auo_pixcir_ts *ts = dev_id;
174 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
175 	struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
176 	int i;
177 	int ret;
178 	int fingers = 0;
179 	int abs = -1;
180 
181 	while (!ts->stopped) {
182 
183 		/* check for up event in touch touch_ind_mode */
184 		if (ts->touch_ind_mode) {
185 			if (gpio_get_value(pdata->gpio_int) == 0) {
186 				input_mt_sync(ts->input);
187 				input_report_key(ts->input, BTN_TOUCH, 0);
188 				input_sync(ts->input);
189 				break;
190 			}
191 		}
192 
193 		ret = auo_pixcir_collect_data(ts, point);
194 		if (ret < 0) {
195 			/* we want to loop only in touch_ind_mode */
196 			if (!ts->touch_ind_mode)
197 				break;
198 
199 			wait_event_timeout(ts->wait, ts->stopped,
200 				msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
201 			continue;
202 		}
203 
204 		for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
205 			if (point[i].coord_x > 0 || point[i].coord_y > 0) {
206 				input_report_abs(ts->input, ABS_MT_POSITION_X,
207 						 point[i].coord_x);
208 				input_report_abs(ts->input, ABS_MT_POSITION_Y,
209 						 point[i].coord_y);
210 				input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
211 						 point[i].area_major);
212 				input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
213 						 point[i].area_minor);
214 				input_report_abs(ts->input, ABS_MT_ORIENTATION,
215 						 point[i].orientation);
216 				input_mt_sync(ts->input);
217 
218 				/* use first finger as source for singletouch */
219 				if (fingers == 0)
220 					abs = i;
221 
222 				/* number of touch points could also be queried
223 				 * via i2c but would require an additional call
224 				 */
225 				fingers++;
226 			}
227 		}
228 
229 		input_report_key(ts->input, BTN_TOUCH, fingers > 0);
230 
231 		if (abs > -1) {
232 			input_report_abs(ts->input, ABS_X, point[abs].coord_x);
233 			input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
234 		}
235 
236 		input_sync(ts->input);
237 
238 		/* we want to loop only in touch_ind_mode */
239 		if (!ts->touch_ind_mode)
240 			break;
241 
242 		wait_event_timeout(ts->wait, ts->stopped,
243 				 msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
244 	}
245 
246 	return IRQ_HANDLED;
247 }
248 
249 /*
250  * Set the power mode of the device.
251  * Valid modes are
252  * - AUO_PIXCIR_POWER_ACTIVE
253  * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
254  * - AUO_PIXCIR_POWER_DEEP_SLEEP
255  */
256 static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
257 {
258 	struct i2c_client *client = ts->client;
259 	int ret;
260 
261 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
262 	if (ret < 0) {
263 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
264 			AUO_PIXCIR_REG_POWER_MODE, ret);
265 		return ret;
266 	}
267 
268 	ret &= ~AUO_PIXCIR_POWER_MASK;
269 	ret |= mode;
270 
271 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
272 	if (ret) {
273 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
274 			AUO_PIXCIR_REG_POWER_MODE, ret);
275 		return ret;
276 	}
277 
278 	return 0;
279 }
280 
281 static int auo_pixcir_int_config(struct auo_pixcir_ts *ts,
282 					   int int_setting)
283 {
284 	struct i2c_client *client = ts->client;
285 	const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
286 	int ret;
287 
288 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
289 	if (ret < 0) {
290 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
291 			AUO_PIXCIR_REG_INT_SETTING, ret);
292 		return ret;
293 	}
294 
295 	ret &= ~AUO_PIXCIR_INT_MODE_MASK;
296 	ret |= int_setting;
297 	ret |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
298 
299 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
300 					ret);
301 	if (ret < 0) {
302 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
303 			AUO_PIXCIR_REG_INT_SETTING, ret);
304 		return ret;
305 	}
306 
307 	ts->touch_ind_mode = pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND;
308 
309 	return 0;
310 }
311 
312 /* control the generation of interrupts on the device side */
313 static int auo_pixcir_int_toggle(struct auo_pixcir_ts *ts, bool enable)
314 {
315 	struct i2c_client *client = ts->client;
316 	int ret;
317 
318 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
319 	if (ret < 0) {
320 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
321 			AUO_PIXCIR_REG_INT_SETTING, ret);
322 		return ret;
323 	}
324 
325 	if (enable)
326 		ret |= AUO_PIXCIR_INT_ENABLE;
327 	else
328 		ret &= ~AUO_PIXCIR_INT_ENABLE;
329 
330 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
331 					ret);
332 	if (ret < 0) {
333 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
334 			AUO_PIXCIR_REG_INT_SETTING, ret);
335 		return ret;
336 	}
337 
338 	return 0;
339 }
340 
341 static int auo_pixcir_start(struct auo_pixcir_ts *ts)
342 {
343 	struct i2c_client *client = ts->client;
344 	int ret;
345 
346 	ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_ACTIVE);
347 	if (ret < 0) {
348 		dev_err(&client->dev, "could not set power mode, %d\n",
349 			ret);
350 		return ret;
351 	}
352 
353 	ts->stopped = false;
354 	mb();
355 	enable_irq(client->irq);
356 
357 	ret = auo_pixcir_int_toggle(ts, 1);
358 	if (ret < 0) {
359 		dev_err(&client->dev, "could not enable interrupt, %d\n",
360 			ret);
361 		disable_irq(client->irq);
362 		return ret;
363 	}
364 
365 	return 0;
366 }
367 
368 static int auo_pixcir_stop(struct auo_pixcir_ts *ts)
369 {
370 	struct i2c_client *client = ts->client;
371 	int ret;
372 
373 	ret = auo_pixcir_int_toggle(ts, 0);
374 	if (ret < 0) {
375 		dev_err(&client->dev, "could not disable interrupt, %d\n",
376 			ret);
377 		return ret;
378 	}
379 
380 	/* disable receiving of interrupts */
381 	disable_irq(client->irq);
382 	ts->stopped = true;
383 	mb();
384 	wake_up(&ts->wait);
385 
386 	return auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_DEEP_SLEEP);
387 }
388 
389 static int auo_pixcir_input_open(struct input_dev *dev)
390 {
391 	struct auo_pixcir_ts *ts = input_get_drvdata(dev);
392 
393 	return auo_pixcir_start(ts);
394 }
395 
396 static void auo_pixcir_input_close(struct input_dev *dev)
397 {
398 	struct auo_pixcir_ts *ts = input_get_drvdata(dev);
399 
400 	auo_pixcir_stop(ts);
401 }
402 
403 static int __maybe_unused auo_pixcir_suspend(struct device *dev)
404 {
405 	struct i2c_client *client = to_i2c_client(dev);
406 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
407 	struct input_dev *input = ts->input;
408 	int ret = 0;
409 
410 	mutex_lock(&input->mutex);
411 
412 	/* when configured as wakeup source, device should always wake system
413 	 * therefore start device if necessary
414 	 */
415 	if (device_may_wakeup(&client->dev)) {
416 		/* need to start device if not open, to be wakeup source */
417 		if (!input_device_enabled(input)) {
418 			ret = auo_pixcir_start(ts);
419 			if (ret)
420 				goto unlock;
421 		}
422 
423 		enable_irq_wake(client->irq);
424 		ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
425 	} else if (input_device_enabled(input)) {
426 		ret = auo_pixcir_stop(ts);
427 	}
428 
429 unlock:
430 	mutex_unlock(&input->mutex);
431 
432 	return ret;
433 }
434 
435 static int __maybe_unused auo_pixcir_resume(struct device *dev)
436 {
437 	struct i2c_client *client = to_i2c_client(dev);
438 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
439 	struct input_dev *input = ts->input;
440 	int ret = 0;
441 
442 	mutex_lock(&input->mutex);
443 
444 	if (device_may_wakeup(&client->dev)) {
445 		disable_irq_wake(client->irq);
446 
447 		/* need to stop device if it was not open on suspend */
448 		if (!input_device_enabled(input)) {
449 			ret = auo_pixcir_stop(ts);
450 			if (ret)
451 				goto unlock;
452 		}
453 
454 		/* device wakes automatically from SLEEP */
455 	} else if (input_device_enabled(input)) {
456 		ret = auo_pixcir_start(ts);
457 	}
458 
459 unlock:
460 	mutex_unlock(&input->mutex);
461 
462 	return ret;
463 }
464 
465 static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
466 			 auo_pixcir_suspend, auo_pixcir_resume);
467 
468 #ifdef CONFIG_OF
469 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
470 {
471 	struct auo_pixcir_ts_platdata *pdata;
472 	struct device_node *np = dev->of_node;
473 
474 	if (!np)
475 		return ERR_PTR(-ENOENT);
476 
477 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
478 	if (!pdata)
479 		return ERR_PTR(-ENOMEM);
480 
481 	pdata->gpio_int = of_get_gpio(np, 0);
482 	if (!gpio_is_valid(pdata->gpio_int)) {
483 		dev_err(dev, "failed to get interrupt gpio\n");
484 		return ERR_PTR(-EINVAL);
485 	}
486 
487 	pdata->gpio_rst = of_get_gpio(np, 1);
488 	if (!gpio_is_valid(pdata->gpio_rst)) {
489 		dev_err(dev, "failed to get reset gpio\n");
490 		return ERR_PTR(-EINVAL);
491 	}
492 
493 	if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
494 		dev_err(dev, "failed to get x-size property\n");
495 		return ERR_PTR(-EINVAL);
496 	}
497 
498 	if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
499 		dev_err(dev, "failed to get y-size property\n");
500 		return ERR_PTR(-EINVAL);
501 	}
502 
503 	/* default to asserting the interrupt when the screen is touched */
504 	pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
505 
506 	return pdata;
507 }
508 #else
509 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
510 {
511 	return ERR_PTR(-EINVAL);
512 }
513 #endif
514 
515 static void auo_pixcir_reset(void *data)
516 {
517 	struct auo_pixcir_ts *ts = data;
518 
519 	gpio_set_value(ts->pdata->gpio_rst, 0);
520 }
521 
522 static int auo_pixcir_probe(struct i2c_client *client,
523 			    const struct i2c_device_id *id)
524 {
525 	const struct auo_pixcir_ts_platdata *pdata;
526 	struct auo_pixcir_ts *ts;
527 	struct input_dev *input_dev;
528 	int version;
529 	int error;
530 
531 	pdata = dev_get_platdata(&client->dev);
532 	if (!pdata) {
533 		pdata = auo_pixcir_parse_dt(&client->dev);
534 		if (IS_ERR(pdata))
535 			return PTR_ERR(pdata);
536 	}
537 
538 	ts = devm_kzalloc(&client->dev,
539 			  sizeof(struct auo_pixcir_ts), GFP_KERNEL);
540 	if (!ts)
541 		return -ENOMEM;
542 
543 	input_dev = devm_input_allocate_device(&client->dev);
544 	if (!input_dev) {
545 		dev_err(&client->dev, "could not allocate input device\n");
546 		return -ENOMEM;
547 	}
548 
549 	ts->pdata = pdata;
550 	ts->client = client;
551 	ts->input = input_dev;
552 	ts->touch_ind_mode = 0;
553 	ts->stopped = true;
554 	init_waitqueue_head(&ts->wait);
555 
556 	snprintf(ts->phys, sizeof(ts->phys),
557 		 "%s/input0", dev_name(&client->dev));
558 
559 	input_dev->name = "AUO-Pixcir touchscreen";
560 	input_dev->phys = ts->phys;
561 	input_dev->id.bustype = BUS_I2C;
562 
563 	input_dev->open = auo_pixcir_input_open;
564 	input_dev->close = auo_pixcir_input_close;
565 
566 	__set_bit(EV_ABS, input_dev->evbit);
567 	__set_bit(EV_KEY, input_dev->evbit);
568 
569 	__set_bit(BTN_TOUCH, input_dev->keybit);
570 
571 	/* For single touch */
572 	input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
573 	input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
574 
575 	/* For multi touch */
576 	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
577 			     pdata->x_max, 0, 0);
578 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
579 			     pdata->y_max, 0, 0);
580 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
581 			     AUO_PIXCIR_MAX_AREA, 0, 0);
582 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
583 			     AUO_PIXCIR_MAX_AREA, 0, 0);
584 	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
585 
586 	input_set_drvdata(ts->input, ts);
587 
588 	error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
589 				      GPIOF_DIR_IN, "auo_pixcir_ts_int");
590 	if (error) {
591 		dev_err(&client->dev, "request of gpio %d failed, %d\n",
592 			pdata->gpio_int, error);
593 		return error;
594 	}
595 
596 	error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
597 				      GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
598 				      "auo_pixcir_ts_rst");
599 	if (error) {
600 		dev_err(&client->dev, "request of gpio %d failed, %d\n",
601 			pdata->gpio_rst, error);
602 		return error;
603 	}
604 
605 	error = devm_add_action_or_reset(&client->dev, auo_pixcir_reset, ts);
606 	if (error) {
607 		dev_err(&client->dev, "failed to register reset action, %d\n",
608 			error);
609 		return error;
610 	}
611 
612 	msleep(200);
613 
614 	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
615 	if (version < 0) {
616 		error = version;
617 		return error;
618 	}
619 
620 	dev_info(&client->dev, "firmware version 0x%X\n", version);
621 
622 	error = auo_pixcir_int_config(ts, pdata->int_setting);
623 	if (error)
624 		return error;
625 
626 	error = devm_request_threaded_irq(&client->dev, client->irq,
627 					  NULL, auo_pixcir_interrupt,
628 					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
629 					  input_dev->name, ts);
630 	if (error) {
631 		dev_err(&client->dev, "irq %d requested failed, %d\n",
632 			client->irq, error);
633 		return error;
634 	}
635 
636 	/* stop device and put it into deep sleep until it is opened */
637 	error = auo_pixcir_stop(ts);
638 	if (error)
639 		return error;
640 
641 	error = input_register_device(input_dev);
642 	if (error) {
643 		dev_err(&client->dev, "could not register input device, %d\n",
644 			error);
645 		return error;
646 	}
647 
648 	i2c_set_clientdata(client, ts);
649 
650 	return 0;
651 }
652 
653 static const struct i2c_device_id auo_pixcir_idtable[] = {
654 	{ "auo_pixcir_ts", 0 },
655 	{ }
656 };
657 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
658 
659 #ifdef CONFIG_OF
660 static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
661 	{ .compatible = "auo,auo_pixcir_ts" },
662 	{},
663 };
664 MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
665 #endif
666 
667 static struct i2c_driver auo_pixcir_driver = {
668 	.driver = {
669 		.name	= "auo_pixcir_ts",
670 		.pm	= &auo_pixcir_pm_ops,
671 		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
672 	},
673 	.probe		= auo_pixcir_probe,
674 	.id_table	= auo_pixcir_idtable,
675 };
676 
677 module_i2c_driver(auo_pixcir_driver);
678 
679 MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
680 MODULE_LICENSE("GPL v2");
681 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
682