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
113struct 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
126struct auo_point_t {
127	int	coord_x;
128	int	coord_y;
129	int	area_major;
130	int	area_minor;
131	int	orientation;
132};
133
134static 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
181static 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 */
266static 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
291static 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 */
323static 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
351static 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
378static 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
399static 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
406static 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	return;
413}
414
415static int __maybe_unused auo_pixcir_suspend(struct device *dev)
416{
417	struct i2c_client *client = to_i2c_client(dev);
418	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
419	struct input_dev *input = ts->input;
420	int ret = 0;
421
422	mutex_lock(&input->mutex);
423
424	/* when configured as wakeup source, device should always wake system
425	 * therefore start device if necessary
426	 */
427	if (device_may_wakeup(&client->dev)) {
428		/* need to start device if not open, to be wakeup source */
429		if (!input->users) {
430			ret = auo_pixcir_start(ts);
431			if (ret)
432				goto unlock;
433		}
434
435		enable_irq_wake(client->irq);
436		ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
437	} else if (input->users) {
438		ret = auo_pixcir_stop(ts);
439	}
440
441unlock:
442	mutex_unlock(&input->mutex);
443
444	return ret;
445}
446
447static int __maybe_unused auo_pixcir_resume(struct device *dev)
448{
449	struct i2c_client *client = to_i2c_client(dev);
450	struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
451	struct input_dev *input = ts->input;
452	int ret = 0;
453
454	mutex_lock(&input->mutex);
455
456	if (device_may_wakeup(&client->dev)) {
457		disable_irq_wake(client->irq);
458
459		/* need to stop device if it was not open on suspend */
460		if (!input->users) {
461			ret = auo_pixcir_stop(ts);
462			if (ret)
463				goto unlock;
464		}
465
466		/* device wakes automatically from SLEEP */
467	} else if (input->users) {
468		ret = auo_pixcir_start(ts);
469	}
470
471unlock:
472	mutex_unlock(&input->mutex);
473
474	return ret;
475}
476
477static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
478			 auo_pixcir_suspend, auo_pixcir_resume);
479
480#ifdef CONFIG_OF
481static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
482{
483	struct auo_pixcir_ts_platdata *pdata;
484	struct device_node *np = dev->of_node;
485
486	if (!np)
487		return ERR_PTR(-ENOENT);
488
489	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
490	if (!pdata) {
491		dev_err(dev, "failed to allocate platform data\n");
492		return ERR_PTR(-ENOMEM);
493	}
494
495	pdata->gpio_int = of_get_gpio(np, 0);
496	if (!gpio_is_valid(pdata->gpio_int)) {
497		dev_err(dev, "failed to get interrupt gpio\n");
498		return ERR_PTR(-EINVAL);
499	}
500
501	pdata->gpio_rst = of_get_gpio(np, 1);
502	if (!gpio_is_valid(pdata->gpio_rst)) {
503		dev_err(dev, "failed to get reset gpio\n");
504		return ERR_PTR(-EINVAL);
505	}
506
507	if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
508		dev_err(dev, "failed to get x-size property\n");
509		return ERR_PTR(-EINVAL);
510	}
511
512	if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
513		dev_err(dev, "failed to get y-size property\n");
514		return ERR_PTR(-EINVAL);
515	}
516
517	/* default to asserting the interrupt when the screen is touched */
518	pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
519
520	return pdata;
521}
522#else
523static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
524{
525	return ERR_PTR(-EINVAL);
526}
527#endif
528
529static void auo_pixcir_reset(void *data)
530{
531	struct auo_pixcir_ts *ts = data;
532
533	gpio_set_value(ts->pdata->gpio_rst, 0);
534}
535
536static int auo_pixcir_probe(struct i2c_client *client,
537			    const struct i2c_device_id *id)
538{
539	const struct auo_pixcir_ts_platdata *pdata;
540	struct auo_pixcir_ts *ts;
541	struct input_dev *input_dev;
542	int version;
543	int error;
544
545	pdata = dev_get_platdata(&client->dev);
546	if (!pdata) {
547		pdata = auo_pixcir_parse_dt(&client->dev);
548		if (IS_ERR(pdata))
549			return PTR_ERR(pdata);
550	}
551
552	ts = devm_kzalloc(&client->dev,
553			  sizeof(struct auo_pixcir_ts), GFP_KERNEL);
554	if (!ts)
555		return -ENOMEM;
556
557	input_dev = devm_input_allocate_device(&client->dev);
558	if (!input_dev) {
559		dev_err(&client->dev, "could not allocate input device\n");
560		return -ENOMEM;
561	}
562
563	ts->pdata = pdata;
564	ts->client = client;
565	ts->input = input_dev;
566	ts->touch_ind_mode = 0;
567	ts->stopped = true;
568	init_waitqueue_head(&ts->wait);
569
570	snprintf(ts->phys, sizeof(ts->phys),
571		 "%s/input0", dev_name(&client->dev));
572
 
 
 
 
 
 
 
 
 
 
573	input_dev->name = "AUO-Pixcir touchscreen";
574	input_dev->phys = ts->phys;
575	input_dev->id.bustype = BUS_I2C;
576
577	input_dev->open = auo_pixcir_input_open;
578	input_dev->close = auo_pixcir_input_close;
579
580	__set_bit(EV_ABS, input_dev->evbit);
581	__set_bit(EV_KEY, input_dev->evbit);
582
583	__set_bit(BTN_TOUCH, input_dev->keybit);
584
585	/* For single touch */
586	input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
587	input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
588
589	/* For multi touch */
590	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
591			     pdata->x_max, 0, 0);
592	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
593			     pdata->y_max, 0, 0);
594	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
595			     AUO_PIXCIR_MAX_AREA, 0, 0);
596	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
597			     AUO_PIXCIR_MAX_AREA, 0, 0);
598	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
599
600	input_set_drvdata(ts->input, ts);
601
602	error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
603				      GPIOF_DIR_IN, "auo_pixcir_ts_int");
604	if (error) {
605		dev_err(&client->dev, "request of gpio %d failed, %d\n",
606			pdata->gpio_int, error);
607		return error;
608	}
609
610	error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
611				      GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
612				      "auo_pixcir_ts_rst");
 
 
 
613	if (error) {
614		dev_err(&client->dev, "request of gpio %d failed, %d\n",
615			pdata->gpio_rst, error);
616		return error;
617	}
618
619	error = devm_add_action(&client->dev, auo_pixcir_reset, ts);
 
 
620	if (error) {
621		auo_pixcir_reset(ts);
622		dev_err(&client->dev, "failed to register reset action, %d\n",
623			error);
624		return error;
625	}
626
627	msleep(200);
628
629	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
630	if (version < 0) {
631		error = version;
632		return error;
633	}
634
635	dev_info(&client->dev, "firmware version 0x%X\n", version);
636
637	error = auo_pixcir_int_config(ts, pdata->int_setting);
 
638	if (error)
639		return error;
640
641	error = devm_request_threaded_irq(&client->dev, client->irq,
642					  NULL, auo_pixcir_interrupt,
643					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
644					  input_dev->name, ts);
645	if (error) {
646		dev_err(&client->dev, "irq %d requested failed, %d\n",
647			client->irq, error);
648		return error;
649	}
650
651	/* stop device and put it into deep sleep until it is opened */
652	error = auo_pixcir_stop(ts);
653	if (error)
654		return error;
655
656	error = input_register_device(input_dev);
657	if (error) {
658		dev_err(&client->dev, "could not register input device, %d\n",
659			error);
660		return error;
661	}
662
663	i2c_set_clientdata(client, ts);
664
665	return 0;
666}
667
668static const struct i2c_device_id auo_pixcir_idtable[] = {
669	{ "auo_pixcir_ts", 0 },
670	{ }
671};
672MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
673
674#ifdef CONFIG_OF
675static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
676	{ .compatible = "auo,auo_pixcir_ts" },
677	{},
678};
679MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
680#endif
681
682static struct i2c_driver auo_pixcir_driver = {
683	.driver = {
684		.name	= "auo_pixcir_ts",
685		.pm	= &auo_pixcir_pm_ops,
686		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
687	},
688	.probe		= auo_pixcir_probe,
689	.id_table	= auo_pixcir_idtable,
690};
691
692module_i2c_driver(auo_pixcir_driver);
693
694MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
695MODULE_LICENSE("GPL v2");
696MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");

  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 periodically
 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
113struct 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
130struct auo_point_t {
131	int	coord_x;
132	int	coord_y;
133	int	area_major;
134	int	area_minor;
135	int	orientation;
136};
137
138static 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
184static 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 */
268static 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
293static 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 */
323static 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
351static 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
378static 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
399static 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
406static 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
413static int 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
439unlock:
440	mutex_unlock(&input->mutex);
441
442	return ret;
443}
444
445static int 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
469unlock:
470	mutex_unlock(&input->mutex);
471
472	return ret;
473}
474
475static DEFINE_SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
476				auo_pixcir_suspend, auo_pixcir_resume);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
477
478static 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
485static int auo_pixcir_probe(struct i2c_client *client)
 
486{
 
487	struct auo_pixcir_ts *ts;
488	struct input_dev *input_dev;
489	int version;
490	int error;
491
492	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
 
 
 
 
 
 
 
 
493	if (!ts)
494		return -ENOMEM;
495
496	input_dev = devm_input_allocate_device(&client->dev);
497	if (!input_dev) {
498		dev_err(&client->dev, "could not allocate input device\n");
499		return -ENOMEM;
500	}
501
 
502	ts->client = client;
503	ts->input = input_dev;
504	ts->touch_ind_mode = 0;
505	ts->stopped = true;
506	init_waitqueue_head(&ts->wait);
507
508	snprintf(ts->phys, sizeof(ts->phys),
509		 "%s/input0", dev_name(&client->dev));
510
511	if (device_property_read_u32(&client->dev, "x-size", &ts->x_max)) {
512		dev_err(&client->dev, "failed to get x-size property\n");
513		return -EINVAL;
514	}
515
516	if (device_property_read_u32(&client->dev, "y-size", &ts->y_max)) {
517		dev_err(&client->dev, "failed to get y-size property\n");
518		return -EINVAL;
519	}
520
521	input_dev->name = "AUO-Pixcir touchscreen";
522	input_dev->phys = ts->phys;
523	input_dev->id.bustype = BUS_I2C;
524
525	input_dev->open = auo_pixcir_input_open;
526	input_dev->close = auo_pixcir_input_close;
527
528	__set_bit(EV_ABS, input_dev->evbit);
529	__set_bit(EV_KEY, input_dev->evbit);
530
531	__set_bit(BTN_TOUCH, input_dev->keybit);
532
533	/* For single touch */
534	input_set_abs_params(input_dev, ABS_X, 0, ts->x_max, 0, 0);
535	input_set_abs_params(input_dev, ABS_Y, 0, ts->y_max, 0, 0);
536
537	/* For multi touch */
538	input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
539	input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
540	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
541			     0, AUO_PIXCIR_MAX_AREA, 0, 0);
542	input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
543			     0, AUO_PIXCIR_MAX_AREA, 0, 0);
 
 
544	input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
545
546	input_set_drvdata(ts->input, ts);
547
548	ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, GPIOD_IN);
549	error = PTR_ERR_OR_ZERO(ts->gpio_int);
550	if (error) {
551		dev_err(&client->dev,
552			"request of int gpio failed: %d\n", error);
553		return error;
554	}
555
556	gpiod_set_consumer_name(ts->gpio_int, "auo_pixcir_ts_int");
557
558	/* Take the chip out of reset */
559	ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1,
560					    GPIOD_OUT_LOW);
561	error = PTR_ERR_OR_ZERO(ts->gpio_rst);
562	if (error) {
563		dev_err(&client->dev,
564			"request of reset gpio failed: %d\n", error);
565		return error;
566	}
567
568	gpiod_set_consumer_name(ts->gpio_rst, "auo_pixcir_ts_rst");
569
570	error = devm_add_action_or_reset(&client->dev, auo_pixcir_reset, ts);
571	if (error) {
 
572		dev_err(&client->dev, "failed to register reset action, %d\n",
573			error);
574		return error;
575	}
576
577	msleep(200);
578
579	version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
580	if (version < 0) {
581		error = version;
582		return error;
583	}
584
585	dev_info(&client->dev, "firmware version 0x%X\n", version);
586
587	/* default to asserting the interrupt when the screen is touched */
588	error = auo_pixcir_int_config(ts, AUO_PIXCIR_INT_TOUCH_IND);
589	if (error)
590		return error;
591
592	error = devm_request_threaded_irq(&client->dev, client->irq,
593					  NULL, auo_pixcir_interrupt,
594					  IRQF_ONESHOT,
595					  input_dev->name, ts);
596	if (error) {
597		dev_err(&client->dev, "irq %d requested failed, %d\n",
598			client->irq, error);
599		return error;
600	}
601
602	/* stop device and put it into deep sleep until it is opened */
603	error = auo_pixcir_stop(ts);
604	if (error)
605		return error;
606
607	error = input_register_device(input_dev);
608	if (error) {
609		dev_err(&client->dev, "could not register input device, %d\n",
610			error);
611		return error;
612	}
613
614	i2c_set_clientdata(client, ts);
615
616	return 0;
617}
618
619static const struct i2c_device_id auo_pixcir_idtable[] = {
620	{ "auo_pixcir_ts" },
621	{ }
622};
623MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
624
625#ifdef CONFIG_OF
626static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
627	{ .compatible = "auo,auo_pixcir_ts" },
628	{},
629};
630MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
631#endif
632
633static struct i2c_driver auo_pixcir_driver = {
634	.driver = {
635		.name	= "auo_pixcir_ts",
636		.pm	= pm_sleep_ptr(&auo_pixcir_pm_ops),
637		.of_match_table	= of_match_ptr(auo_pixcir_ts_dt_idtable),
638	},
639	.probe		= auo_pixcir_probe,
640	.id_table	= auo_pixcir_idtable,
641};
642
643module_i2c_driver(auo_pixcir_driver);
644
645MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
646MODULE_LICENSE("GPL v2");
647MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");