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/err.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/interrupt.h>
17 #include <linux/slab.h>
18 #include <linux/input.h>
19 #include <linux/jiffies.h>
20 #include <linux/i2c.h>
21 #include <linux/mutex.h>
22 #include <linux/delay.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/of.h>
25 #include <linux/property.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 
73 /*
74  * Interrupt modes:
75  * periodical:		interrupt is asserted periodicaly
76  * compare coordinates:	interrupt is asserted when coordinates change
77  * indicate touch:	interrupt is asserted during touch
78  */
79 #define AUO_PIXCIR_INT_PERIODICAL	0x00
80 #define AUO_PIXCIR_INT_COMP_COORD	0x01
81 #define AUO_PIXCIR_INT_TOUCH_IND	0x02
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 	struct gpio_desc	*gpio_int;
117 	struct gpio_desc	*gpio_rst;
118 	char			phys[32];
119 
120 	unsigned int		x_max;
121 	unsigned int		y_max;
122 
123 	/* special handling for touch_indicate interrupt mode */
124 	bool			touch_ind_mode;
125 
126 	wait_queue_head_t	wait;
127 	bool			stopped;
128 };
129 
130 struct auo_point_t {
131 	int	coord_x;
132 	int	coord_y;
133 	int	area_major;
134 	int	area_minor;
135 	int	orientation;
136 };
137 
138 static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
139 				   struct auo_point_t *point)
140 {
141 	struct i2c_client *client = ts->client;
142 	uint8_t raw_coord[8];
143 	uint8_t raw_area[4];
144 	int i, ret;
145 
146 	/* touch coordinates */
147 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
148 					    8, raw_coord);
149 	if (ret < 0) {
150 		dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
151 		return ret;
152 	}
153 
154 	/* touch area */
155 	ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
156 					    4, raw_area);
157 	if (ret < 0) {
158 		dev_err(&client->dev, "could not read touch area, %d\n", ret);
159 		return ret;
160 	}
161 
162 	for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
163 		point[i].coord_x =
164 			raw_coord[4 * i + 1] << 8 | raw_coord[4 * i];
165 		point[i].coord_y =
166 			raw_coord[4 * i + 3] << 8 | raw_coord[4 * i + 2];
167 
168 		if (point[i].coord_x > ts->x_max ||
169 		    point[i].coord_y > ts->y_max) {
170 			dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
171 				point[i].coord_x, point[i].coord_y);
172 			point[i].coord_x = point[i].coord_y = 0;
173 		}
174 
175 		/* determine touch major, minor and orientation */
176 		point[i].area_major = max(raw_area[2 * i], raw_area[2 * i + 1]);
177 		point[i].area_minor = min(raw_area[2 * i], raw_area[2 * i + 1]);
178 		point[i].orientation = raw_area[2 * i] > raw_area[2 * i + 1];
179 	}
180 
181 	return 0;
182 }
183 
184 static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
185 {
186 	struct auo_pixcir_ts *ts = dev_id;
187 	struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
188 	int i;
189 	int ret;
190 	int fingers = 0;
191 	int abs = -1;
192 
193 	while (!ts->stopped) {
194 
195 		/* check for up event in touch touch_ind_mode */
196 		if (ts->touch_ind_mode) {
197 			if (gpiod_get_value_cansleep(ts->gpio_int) == 0) {
198 				input_mt_sync(ts->input);
199 				input_report_key(ts->input, BTN_TOUCH, 0);
200 				input_sync(ts->input);
201 				break;
202 			}
203 		}
204 
205 		ret = auo_pixcir_collect_data(ts, point);
206 		if (ret < 0) {
207 			/* we want to loop only in touch_ind_mode */
208 			if (!ts->touch_ind_mode)
209 				break;
210 
211 			wait_event_timeout(ts->wait, ts->stopped,
212 				msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
213 			continue;
214 		}
215 
216 		for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
217 			if (point[i].coord_x > 0 || point[i].coord_y > 0) {
218 				input_report_abs(ts->input, ABS_MT_POSITION_X,
219 						 point[i].coord_x);
220 				input_report_abs(ts->input, ABS_MT_POSITION_Y,
221 						 point[i].coord_y);
222 				input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
223 						 point[i].area_major);
224 				input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
225 						 point[i].area_minor);
226 				input_report_abs(ts->input, ABS_MT_ORIENTATION,
227 						 point[i].orientation);
228 				input_mt_sync(ts->input);
229 
230 				/* use first finger as source for singletouch */
231 				if (fingers == 0)
232 					abs = i;
233 
234 				/* number of touch points could also be queried
235 				 * via i2c but would require an additional call
236 				 */
237 				fingers++;
238 			}
239 		}
240 
241 		input_report_key(ts->input, BTN_TOUCH, fingers > 0);
242 
243 		if (abs > -1) {
244 			input_report_abs(ts->input, ABS_X, point[abs].coord_x);
245 			input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
246 		}
247 
248 		input_sync(ts->input);
249 
250 		/* we want to loop only in touch_ind_mode */
251 		if (!ts->touch_ind_mode)
252 			break;
253 
254 		wait_event_timeout(ts->wait, ts->stopped,
255 				 msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
256 	}
257 
258 	return IRQ_HANDLED;
259 }
260 
261 /*
262  * Set the power mode of the device.
263  * Valid modes are
264  * - AUO_PIXCIR_POWER_ACTIVE
265  * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
266  * - AUO_PIXCIR_POWER_DEEP_SLEEP
267  */
268 static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
269 {
270 	struct i2c_client *client = ts->client;
271 	int ret;
272 
273 	ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
274 	if (ret < 0) {
275 		dev_err(&client->dev, "unable to read reg %Xh, %d\n",
276 			AUO_PIXCIR_REG_POWER_MODE, ret);
277 		return ret;
278 	}
279 
280 	ret &= ~AUO_PIXCIR_POWER_MASK;
281 	ret |= mode;
282 
283 	ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
284 	if (ret) {
285 		dev_err(&client->dev, "unable to write reg %Xh, %d\n",
286 			AUO_PIXCIR_REG_POWER_MODE, ret);
287 		return ret;
288 	}
289 
290 	return 0;
291 }
292 
293 static int auo_pixcir_int_config(struct auo_pixcir_ts *ts, int int_setting)
294 {
295 	struct i2c_client *client = ts->client;
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 = 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 
403 	return auo_pixcir_start(ts);
404 }
405 
406 static void auo_pixcir_input_close(struct input_dev *dev)
407 {
408 	struct auo_pixcir_ts *ts = input_get_drvdata(dev);
409 
410 	auo_pixcir_stop(ts);
411 }
412 
413 static int __maybe_unused auo_pixcir_suspend(struct device *dev)
414 {
415 	struct i2c_client *client = to_i2c_client(dev);
416 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
417 	struct input_dev *input = ts->input;
418 	int ret = 0;
419 
420 	mutex_lock(&input->mutex);
421 
422 	/* when configured as wakeup source, device should always wake system
423 	 * therefore start device if necessary
424 	 */
425 	if (device_may_wakeup(&client->dev)) {
426 		/* need to start device if not open, to be wakeup source */
427 		if (!input_device_enabled(input)) {
428 			ret = auo_pixcir_start(ts);
429 			if (ret)
430 				goto unlock;
431 		}
432 
433 		enable_irq_wake(client->irq);
434 		ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
435 	} else if (input_device_enabled(input)) {
436 		ret = auo_pixcir_stop(ts);
437 	}
438 
439 unlock:
440 	mutex_unlock(&input->mutex);
441 
442 	return ret;
443 }
444 
445 static int __maybe_unused auo_pixcir_resume(struct device *dev)
446 {
447 	struct i2c_client *client = to_i2c_client(dev);
448 	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
449 	struct input_dev *input = ts->input;
450 	int ret = 0;
451 
452 	mutex_lock(&input->mutex);
453 
454 	if (device_may_wakeup(&client->dev)) {
455 		disable_irq_wake(client->irq);
456 
457 		/* need to stop device if it was not open on suspend */
458 		if (!input_device_enabled(input)) {
459 			ret = auo_pixcir_stop(ts);
460 			if (ret)
461 				goto unlock;
462 		}
463 
464 		/* device wakes automatically from SLEEP */
465 	} else if (input_device_enabled(input)) {
466 		ret = auo_pixcir_start(ts);
467 	}
468 
469 unlock:
470 	mutex_unlock(&input->mutex);
471 
472 	return ret;
473 }
474 
475 static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
476 			 auo_pixcir_suspend, auo_pixcir_resume);
477 
478 static void auo_pixcir_reset(void *data)
479 {
480 	struct auo_pixcir_ts *ts = data;
481 
482 	gpiod_set_value_cansleep(ts->gpio_rst, 1);
483 }
484 
485 static int auo_pixcir_probe(struct i2c_client *client,
486 			    const struct i2c_device_id *id)
487 {
488 	struct auo_pixcir_ts *ts;
489 	struct input_dev *input_dev;
490 	int version;
491 	int error;
492 
493 	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
494 	if (!ts)
495 		return -ENOMEM;
496 
497 	input_dev = devm_input_allocate_device(&client->dev);
498 	if (!input_dev) {
499 		dev_err(&client->dev, "could not allocate input device\n");
500 		return -ENOMEM;
501 	}
502 
503 	ts->client = client;
504 	ts->input = input_dev;
505 	ts->touch_ind_mode = 0;
506 	ts->stopped = true;
507 	init_waitqueue_head(&ts->wait);
508 
509 	snprintf(ts->phys, sizeof(ts->phys),
510 		 "%s/input0", dev_name(&client->dev));
511 
512 	if (device_property_read_u32(&client->dev, "x-size", &ts->x_max)) {
513 		dev_err(&client->dev, "failed to get x-size property\n");
514 		return -EINVAL;
515 	}
516 
517 	if (device_property_read_u32(&client->dev, "y-size", &ts->y_max)) {
518 		dev_err(&client->dev, "failed to get y-size property\n");
519 		return -EINVAL;
520 	}
521 
522 	input_dev->name = "AUO-Pixcir touchscreen";
523 	input_dev->phys = ts->phys;
524 	input_dev->id.bustype = BUS_I2C;
525 
526 	input_dev->open = auo_pixcir_input_open;
527 	input_dev->close = auo_pixcir_input_close;
528 
529 	__set_bit(EV_ABS, input_dev->evbit);
530 	__set_bit(EV_KEY, input_dev->evbit);
531 
532 	__set_bit(BTN_TOUCH, input_dev->keybit);
533 
534 	/* For single touch */
535 	input_set_abs_params(input_dev, ABS_X, 0, ts->x_max, 0, 0);
536 	input_set_abs_params(input_dev, ABS_Y, 0, ts->y_max, 0, 0);
537 
538 	/* For multi touch */
539 	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
540 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
541 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
542 			     0, AUO_PIXCIR_MAX_AREA, 0, 0);
543 	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
544 			     0, AUO_PIXCIR_MAX_AREA, 0, 0);
545 	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
546 
547 	input_set_drvdata(ts->input, ts);
548 
549 	ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, GPIOD_IN);
550 	error = PTR_ERR_OR_ZERO(ts->gpio_int);
551 	if (error) {
552 		dev_err(&client->dev,
553 			"request of int gpio failed: %d\n", error);
554 		return error;
555 	}
556 
557 	gpiod_set_consumer_name(ts->gpio_int, "auo_pixcir_ts_int");
558 
559 	/* Take the chip out of reset */
560 	ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1,
561 					    GPIOD_OUT_LOW);
562 	error = PTR_ERR_OR_ZERO(ts->gpio_rst);
563 	if (error) {
564 		dev_err(&client->dev,
565 			"request of reset gpio failed: %d\n", error);
566 		return error;
567 	}
568 
569 	gpiod_set_consumer_name(ts->gpio_rst, "auo_pixcir_ts_rst");
570 
571 	error = devm_add_action_or_reset(&client->dev, auo_pixcir_reset, ts);
572 	if (error) {
573 		dev_err(&client->dev, "failed to register reset action, %d\n",
574 			error);
575 		return error;
576 	}
577 
578 	msleep(200);
579 
580 	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
581 	if (version < 0) {
582 		error = version;
583 		return error;
584 	}
585 
586 	dev_info(&client->dev, "firmware version 0x%X\n", version);
587 
588 	/* default to asserting the interrupt when the screen is touched */
589 	error = auo_pixcir_int_config(ts, AUO_PIXCIR_INT_TOUCH_IND);
590 	if (error)
591 		return error;
592 
593 	error = devm_request_threaded_irq(&client->dev, client->irq,
594 					  NULL, auo_pixcir_interrupt,
595 					  IRQF_ONESHOT,
596 					  input_dev->name, ts);
597 	if (error) {
598 		dev_err(&client->dev, "irq %d requested failed, %d\n",
599 			client->irq, error);
600 		return error;
601 	}
602 
603 	/* stop device and put it into deep sleep until it is opened */
604 	error = auo_pixcir_stop(ts);
605 	if (error)
606 		return error;
607 
608 	error = input_register_device(input_dev);
609 	if (error) {
610 		dev_err(&client->dev, "could not register input device, %d\n",
611 			error);
612 		return error;
613 	}
614 
615 	i2c_set_clientdata(client, ts);
616 
617 	return 0;
618 }
619 
620 static const struct i2c_device_id auo_pixcir_idtable[] = {
621 	{ "auo_pixcir_ts", 0 },
622 	{ }
623 };
624 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
625 
626 #ifdef CONFIG_OF
627 static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
628 	{ .compatible = "auo,auo_pixcir_ts" },
629 	{},
630 };
631 MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
632 #endif
633 
634 static struct i2c_driver auo_pixcir_driver = {
635 	.driver = {
636 		.name	= "auo_pixcir_ts",
637 		.pm	= &auo_pixcir_pm_ops,
638 		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
639 	},
640 	.probe		= auo_pixcir_probe,
641 	.id_table	= auo_pixcir_idtable,
642 };
643 
644 module_i2c_driver(auo_pixcir_driver);
645 
646 MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
647 MODULE_LICENSE("GPL v2");
648 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
649