Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

Linux/drivers/input/touchscreen/auo-pixcir-ts.c

  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 
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         return;
413 }
414 
415 static 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 
441 unlock:
442         mutex_unlock(&input->mutex);
443 
444         return ret;
445 }
446 
447 static 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 
471 unlock:
472         mutex_unlock(&input->mutex);
473 
474         return ret;
475 }
476 
477 static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
478                          auo_pixcir_suspend, auo_pixcir_resume);
479 
480 #ifdef CONFIG_OF
481 static 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
523 static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
524 {
525         return ERR_PTR(-EINVAL);
526 }
527 #endif
528 
529 static 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 
536 static 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 
668 static const struct i2c_device_id auo_pixcir_idtable[] = {
669         { "auo_pixcir_ts", 0 },
670         { }
671 };
672 MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
673 
674 #ifdef CONFIG_OF
675 static const struct of_device_id auo_pixcir_ts_dt_idtable[] = {
676         { .compatible = "auo,auo_pixcir_ts" },
677         {},
678 };
679 MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
680 #endif
681 
682 static 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 
692 module_i2c_driver(auo_pixcir_driver);
693 
694 MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
695 MODULE_LICENSE("GPL v2");
696 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
697 

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