drivers/input/touchscreen/ad7879.c

   1 /*
   2  * AD7879/AD7889 based touchscreen and GPIO driver
   3  *
   4  * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  *
   8  * History:
   9  * Copyright (c) 2005 David Brownell
  10  * Copyright (c) 2006 Nokia Corporation
  11  * Various changes: Imre Deak <imre.deak@nokia.com>
  12  *
  13  * Using code from:
  14  *  - corgi_ts.c
  15  *      Copyright (C) 2004-2005 Richard Purdie
  16  *  - omap_ts.[hc], ads7846.h, ts_osk.c
  17  *      Copyright (C) 2002 MontaVista Software
  18  *      Copyright (C) 2004 Texas Instruments
  19  *      Copyright (C) 2005 Dirk Behme
  20  *  - ad7877.c
  21  *      Copyright (C) 2006-2008 Analog Devices Inc.
  22  */
  23
  24 #include <linux/device.h>
  25 #include <linux/delay.h>
  26 #include <linux/input.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/irq.h>
  29 #include <linux/property.h>
  30 #include <linux/regmap.h>
  31 #include <linux/slab.h>
  32 #include <linux/gpio.h>
  33
  34 #include <linux/input/touchscreen.h>
  35 #include <linux/platform_data/ad7879.h>
  36 #include <linux/module.h>
  37 #include "ad7879.h"
  38
  39 #define AD7879_REG_ZEROS                0
  40 #define AD7879_REG_CTRL1                1
  41 #define AD7879_REG_CTRL2                2
  42 #define AD7879_REG_CTRL3                3
  43 #define AD7879_REG_AUX1HIGH             4
  44 #define AD7879_REG_AUX1LOW              5
  45 #define AD7879_REG_TEMP1HIGH            6
  46 #define AD7879_REG_TEMP1LOW             7
  47 #define AD7879_REG_XPLUS                8
  48 #define AD7879_REG_YPLUS                9
  49 #define AD7879_REG_Z1                   10
  50 #define AD7879_REG_Z2                   11
  51 #define AD7879_REG_AUXVBAT              12
  52 #define AD7879_REG_TEMP                 13
  53 #define AD7879_REG_REVID                14
  54
  55 /* Control REG 1 */
  56 #define AD7879_TMR(x)                   ((x & 0xFF) << 0)
  57 #define AD7879_ACQ(x)                   ((x & 0x3) << 8)
  58 #define AD7879_MODE_NOC                 (0 << 10)       /* Do not convert */
  59 #define AD7879_MODE_SCC                 (1 << 10)       /* Single channel conversion */
  60 #define AD7879_MODE_SEQ0                (2 << 10)       /* Sequence 0 in Slave Mode */
  61 #define AD7879_MODE_SEQ1                (3 << 10)       /* Sequence 1 in Master Mode */
  62 #define AD7879_MODE_INT                 (1 << 15)       /* PENIRQ disabled INT enabled */
  63
  64 /* Control REG 2 */
  65 #define AD7879_FCD(x)                   ((x & 0x3) << 0)
  66 #define AD7879_RESET                    (1 << 4)
  67 #define AD7879_MFS(x)                   ((x & 0x3) << 5)
  68 #define AD7879_AVG(x)                   ((x & 0x3) << 7)
  69 #define AD7879_SER                      (1 << 9)        /* non-differential */
  70 #define AD7879_DFR                      (0 << 9)        /* differential */
  71 #define AD7879_GPIOPOL                  (1 << 10)
  72 #define AD7879_GPIODIR                  (1 << 11)
  73 #define AD7879_GPIO_DATA                (1 << 12)
  74 #define AD7879_GPIO_EN                  (1 << 13)
  75 #define AD7879_PM(x)                    ((x & 0x3) << 14)
  76 #define AD7879_PM_SHUTDOWN              (0)
  77 #define AD7879_PM_DYN                   (1)
  78 #define AD7879_PM_FULLON                (2)
  79
  80 /* Control REG 3 */
  81 #define AD7879_TEMPMASK_BIT             (1<<15)
  82 #define AD7879_AUXVBATMASK_BIT          (1<<14)
  83 #define AD7879_INTMODE_BIT              (1<<13)
  84 #define AD7879_GPIOALERTMASK_BIT        (1<<12)
  85 #define AD7879_AUXLOW_BIT               (1<<11)
  86 #define AD7879_AUXHIGH_BIT              (1<<10)
  87 #define AD7879_TEMPLOW_BIT              (1<<9)
  88 #define AD7879_TEMPHIGH_BIT             (1<<8)
  89 #define AD7879_YPLUS_BIT                (1<<7)
  90 #define AD7879_XPLUS_BIT                (1<<6)
  91 #define AD7879_Z1_BIT                   (1<<5)
  92 #define AD7879_Z2_BIT                   (1<<4)
  93 #define AD7879_AUX_BIT                  (1<<3)
  94 #define AD7879_VBAT_BIT                 (1<<2)
  95 #define AD7879_TEMP_BIT                 (1<<1)
  96
  97 enum {
  98         AD7879_SEQ_YPOS  = 0,
  99         AD7879_SEQ_XPOS  = 1,
 100         AD7879_SEQ_Z1    = 2,
 101         AD7879_SEQ_Z2    = 3,
 102         AD7879_NR_SENSE  = 4,
 103 };
 104
 105 #define MAX_12BIT                       ((1<<12)-1)
 106 #define TS_PEN_UP_TIMEOUT               msecs_to_jiffies(50)
 107
 108 struct ad7879 {
 109         struct regmap           *regmap;
 110         struct device           *dev;
 111         struct input_dev        *input;
 112         struct timer_list       timer;
 113 #ifdef CONFIG_GPIOLIB
 114         struct gpio_chip        gc;
 115         struct mutex            mutex;
 116 #endif
 117         unsigned int            irq;
 118         bool                    disabled;       /* P: input->mutex */
 119         bool                    suspended;      /* P: input->mutex */
 120         bool                    swap_xy;
 121         u16                     conversion_data[AD7879_NR_SENSE];
 122         char                    phys[32];
 123         u8                      first_conversion_delay;
 124         u8                      acquisition_time;
 125         u8                      averaging;
 126         u8                      pen_down_acc_interval;
 127         u8                      median;
 128         u16                     x_plate_ohms;
 129         u16                     cmd_crtl1;
 130         u16                     cmd_crtl2;
 131         u16                     cmd_crtl3;
 132         int                     x;
 133         int                     y;
 134         int                     Rt;
 135 };
 136
 137 static int ad7879_read(struct ad7879 *ts, u8 reg)
 138 {
 139         unsigned int val;
 140         int error;
 141
 142         error = regmap_read(ts->regmap, reg, &val);
 143         if (error) {
 144                 dev_err(ts->dev, "failed to read register %#02x: %d\n",
 145                         reg, error);
 146                 return error;
 147         }
 148
 149         return val;
 150 }
 151
 152 static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
 153 {
 154         int error;
 155
 156         error = regmap_write(ts->regmap, reg, val);
 157         if (error) {
 158                 dev_err(ts->dev,
 159                         "failed to write %#04x to register %#02x: %d\n",
 160                         val, reg, error);
 161                 return error;
 162         }
 163
 164         return 0;
 165 }
 166
 167 static int ad7879_report(struct ad7879 *ts)
 168 {
 169         struct input_dev *input_dev = ts->input;
 170         unsigned Rt;
 171         u16 x, y, z1, z2;
 172
 173         x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
 174         y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
 175         z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
 176         z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
 177
 178         if (ts->swap_xy)
 179                 swap(x, y);
 180
 181         /*
 182          * The samples processed here are already preprocessed by the AD7879.
 183          * The preprocessing function consists of a median and an averaging
 184          * filter.  The combination of these two techniques provides a robust
 185          * solution, discarding the spurious noise in the signal and keeping
 186          * only the data of interest.  The size of both filters is
 187          * programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
 188          * Other user-programmable conversion controls include variable
 189          * acquisition time, and first conversion delay. Up to 16 averages can
 190          * be taken per conversion.
 191          */
 192
 193         if (likely(x && z1)) {
 194                 /* compute touch pressure resistance using equation #1 */
 195                 Rt = (z2 - z1) * x * ts->x_plate_ohms;
 196                 Rt /= z1;
 197                 Rt = (Rt + 2047) >> 12;
 198
 199                 /*
 200                  * Sample found inconsistent, pressure is beyond
 201                  * the maximum. Don't report it to user space.
 202                  */
 203                 if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
 204                         return -EINVAL;
 205
 206                 /*
 207                  * Note that we delay reporting events by one sample.
 208                  * This is done to avoid reporting last sample of the
 209                  * touch sequence, which may be incomplete if finger
 210                  * leaves the surface before last reading is taken.
 211                  */
 212                 if (timer_pending(&ts->timer)) {
 213                         /* Touch continues */
 214                         input_report_key(input_dev, BTN_TOUCH, 1);
 215                         input_report_abs(input_dev, ABS_X, ts->x);
 216                         input_report_abs(input_dev, ABS_Y, ts->y);
 217                         input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
 218                         input_sync(input_dev);
 219                 }
 220
 221                 ts->x = x;
 222                 ts->y = y;
 223                 ts->Rt = Rt;
 224
 225                 return 0;
 226         }
 227
 228         return -EINVAL;
 229 }
 230
 231 static void ad7879_ts_event_release(struct ad7879 *ts)
 232 {
 233         struct input_dev *input_dev = ts->input;
 234
 235         input_report_abs(input_dev, ABS_PRESSURE, 0);
 236         input_report_key(input_dev, BTN_TOUCH, 0);
 237         input_sync(input_dev);
 238 }
 239
 240 static void ad7879_timer(struct timer_list *t)
 241 {
 242         struct ad7879 *ts = from_timer(ts, t, timer);
 243
 244         ad7879_ts_event_release(ts);
 245 }
 246
 247 static irqreturn_t ad7879_irq(int irq, void *handle)
 248 {
 249         struct ad7879 *ts = handle;
 250
 251         regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
 252                          ts->conversion_data, AD7879_NR_SENSE);
 253
 254         if (!ad7879_report(ts))
 255                 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
 256
 257         return IRQ_HANDLED;
 258 }
 259
 260 static void __ad7879_enable(struct ad7879 *ts)
 261 {
 262         ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
 263         ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
 264         ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
 265
 266         enable_irq(ts->irq);
 267 }
 268
 269 static void __ad7879_disable(struct ad7879 *ts)
 270 {
 271         u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) |
 272                 AD7879_PM(AD7879_PM_SHUTDOWN);
 273         disable_irq(ts->irq);
 274
 275         if (del_timer_sync(&ts->timer))
 276                 ad7879_ts_event_release(ts);
 277
 278         ad7879_write(ts, AD7879_REG_CTRL2, reg);
 279 }
 280
 281
 282 static int ad7879_open(struct input_dev *input)
 283 {
 284         struct ad7879 *ts = input_get_drvdata(input);
 285
 286         /* protected by input->mutex */
 287         if (!ts->disabled && !ts->suspended)
 288                 __ad7879_enable(ts);
 289
 290         return 0;
 291 }
 292
 293 static void ad7879_close(struct input_dev* input)
 294 {
 295         struct ad7879 *ts = input_get_drvdata(input);
 296
 297         /* protected by input->mutex */
 298         if (!ts->disabled && !ts->suspended)
 299                 __ad7879_disable(ts);
 300 }
 301
 302 static int __maybe_unused ad7879_suspend(struct device *dev)
 303 {
 304         struct ad7879 *ts = dev_get_drvdata(dev);
 305
 306         mutex_lock(&ts->input->mutex);
 307
 308         if (!ts->suspended && !ts->disabled && ts->input->users)
 309                 __ad7879_disable(ts);
 310
 311         ts->suspended = true;
 312
 313         mutex_unlock(&ts->input->mutex);
 314
 315         return 0;
 316 }
 317
 318 static int __maybe_unused ad7879_resume(struct device *dev)
 319 {
 320         struct ad7879 *ts = dev_get_drvdata(dev);
 321
 322         mutex_lock(&ts->input->mutex);
 323
 324         if (ts->suspended && !ts->disabled && ts->input->users)
 325                 __ad7879_enable(ts);
 326
 327         ts->suspended = false;
 328
 329         mutex_unlock(&ts->input->mutex);
 330
 331         return 0;
 332 }
 333
 334 SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
 335 EXPORT_SYMBOL(ad7879_pm_ops);
 336
 337 static void ad7879_toggle(struct ad7879 *ts, bool disable)
 338 {
 339         mutex_lock(&ts->input->mutex);
 340
 341         if (!ts->suspended && ts->input->users != 0) {
 342
 343                 if (disable) {
 344                         if (ts->disabled)
 345                                 __ad7879_enable(ts);
 346                 } else {
 347                         if (!ts->disabled)
 348                                 __ad7879_disable(ts);
 349                 }
 350         }
 351
 352         ts->disabled = disable;
 353
 354         mutex_unlock(&ts->input->mutex);
 355 }
 356
 357 static ssize_t ad7879_disable_show(struct device *dev,
 358                                      struct device_attribute *attr, char *buf)
 359 {
 360         struct ad7879 *ts = dev_get_drvdata(dev);
 361
 362         return sprintf(buf, "%u\n", ts->disabled);
 363 }
 364
 365 static ssize_t ad7879_disable_store(struct device *dev,
 366                                      struct device_attribute *attr,
 367                                      const char *buf, size_t count)
 368 {
 369         struct ad7879 *ts = dev_get_drvdata(dev);
 370         unsigned int val;
 371         int error;
 372
 373         error = kstrtouint(buf, 10, &val);
 374         if (error)
 375                 return error;
 376
 377         ad7879_toggle(ts, val);
 378
 379         return count;
 380 }
 381
 382 static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
 383
 384 static struct attribute *ad7879_attributes[] = {
 385         &dev_attr_disable.attr,
 386         NULL
 387 };
 388
 389 static const struct attribute_group ad7879_attr_group = {
 390         .attrs = ad7879_attributes,
 391 };
 392
 393 #ifdef CONFIG_GPIOLIB
 394 static int ad7879_gpio_direction_input(struct gpio_chip *chip,
 395                                         unsigned gpio)
 396 {
 397         struct ad7879 *ts = gpiochip_get_data(chip);
 398         int err;
 399
 400         mutex_lock(&ts->mutex);
 401         ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
 402         err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
 403         mutex_unlock(&ts->mutex);
 404
 405         return err;
 406 }
 407
 408 static int ad7879_gpio_direction_output(struct gpio_chip *chip,
 409                                         unsigned gpio, int level)
 410 {
 411         struct ad7879 *ts = gpiochip_get_data(chip);
 412         int err;
 413
 414         mutex_lock(&ts->mutex);
 415         ts->cmd_crtl2 &= ~AD7879_GPIODIR;
 416         ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL;
 417         if (level)
 418                 ts->cmd_crtl2 |= AD7879_GPIO_DATA;
 419         else
 420                 ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
 421
 422         err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
 423         mutex_unlock(&ts->mutex);
 424
 425         return err;
 426 }
 427
 428 static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
 429 {
 430         struct ad7879 *ts = gpiochip_get_data(chip);
 431         u16 val;
 432
 433         mutex_lock(&ts->mutex);
 434         val = ad7879_read(ts, AD7879_REG_CTRL2);
 435         mutex_unlock(&ts->mutex);
 436
 437         return !!(val & AD7879_GPIO_DATA);
 438 }
 439
 440 static void ad7879_gpio_set_value(struct gpio_chip *chip,
 441                                   unsigned gpio, int value)
 442 {
 443         struct ad7879 *ts = gpiochip_get_data(chip);
 444
 445         mutex_lock(&ts->mutex);
 446         if (value)
 447                 ts->cmd_crtl2 |= AD7879_GPIO_DATA;
 448         else
 449                 ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
 450
 451         ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
 452         mutex_unlock(&ts->mutex);
 453 }
 454
 455 static int ad7879_gpio_add(struct ad7879 *ts,
 456                            const struct ad7879_platform_data *pdata)
 457 {
 458         bool gpio_export;
 459         int gpio_base;
 460         int ret = 0;
 461
 462         if (pdata) {
 463                 gpio_export = pdata->gpio_export;
 464                 gpio_base = pdata->gpio_base;
 465         } else {
 466                 gpio_export = device_property_read_bool(ts->dev,
 467                                                         "gpio-controller");
 468                 gpio_base = -1;
 469         }
 470
 471         mutex_init(&ts->mutex);
 472
 473         if (gpio_export) {
 474                 ts->gc.direction_input = ad7879_gpio_direction_input;
 475                 ts->gc.direction_output = ad7879_gpio_direction_output;
 476                 ts->gc.get = ad7879_gpio_get_value;
 477                 ts->gc.set = ad7879_gpio_set_value;
 478                 ts->gc.can_sleep = 1;
 479                 ts->gc.base = gpio_base;
 480                 ts->gc.ngpio = 1;
 481                 ts->gc.label = "AD7879-GPIO";
 482                 ts->gc.owner = THIS_MODULE;
 483                 ts->gc.parent = ts->dev;
 484
 485                 ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
 486                 if (ret)
 487                         dev_err(ts->dev, "failed to register gpio %d\n",
 488                                 ts->gc.base);
 489         }
 490
 491         return ret;
 492 }
 493 #else
 494 static int ad7879_gpio_add(struct ad7879 *ts,
 495                            const struct ad7879_platform_data *pdata)
 496 {
 497         return 0;
 498 }
 499 #endif
 500
 501 static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
 502 {
 503         int err;
 504         u32 tmp;
 505
 506         err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
 507         if (err) {
 508                 dev_err(dev, "failed to get resistance-plate-x property\n");
 509                 return err;
 510         }
 511         ts->x_plate_ohms = (u16)tmp;
 512
 513         device_property_read_u8(dev, "adi,first-conversion-delay",
 514                                 &ts->first_conversion_delay);
 515         device_property_read_u8(dev, "adi,acquisition-time",
 516                                 &ts->acquisition_time);
 517         device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
 518         device_property_read_u8(dev, "adi,averaging", &ts->averaging);
 519         device_property_read_u8(dev, "adi,conversion-interval",
 520                                 &ts->pen_down_acc_interval);
 521
 522         ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
 523
 524         return 0;
 525 }
 526
 527 int ad7879_probe(struct device *dev, struct regmap *regmap,
 528                  int irq, u16 bustype, u8 devid)
 529 {
 530         struct ad7879_platform_data *pdata = dev_get_platdata(dev);
 531         struct ad7879 *ts;
 532         struct input_dev *input_dev;
 533         int err;
 534         u16 revid;
 535
 536         if (irq <= 0) {
 537                 dev_err(dev, "No IRQ specified\n");
 538                 return -EINVAL;
 539         }
 540
 541         ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
 542         if (!ts)
 543                 return -ENOMEM;
 544
 545         if (pdata) {
 546                 /* Platform data use swapped axis (backward compatibility) */
 547                 ts->swap_xy = !pdata->swap_xy;
 548
 549                 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
 550
 551                 ts->first_conversion_delay = pdata->first_conversion_delay;
 552                 ts->acquisition_time = pdata->acquisition_time;
 553                 ts->averaging = pdata->averaging;
 554                 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
 555                 ts->median = pdata->median;
 556         } else {
 557                 err = ad7879_parse_dt(dev, ts);
 558                 if (err)
 559                         return err;
 560         }
 561
 562         input_dev = devm_input_allocate_device(dev);
 563         if (!input_dev) {
 564                 dev_err(dev, "Failed to allocate input device\n");
 565                 return -ENOMEM;
 566         }
 567
 568         ts->dev = dev;
 569         ts->input = input_dev;
 570         ts->irq = irq;
 571         ts->regmap = regmap;
 572
 573         timer_setup(&ts->timer, ad7879_timer, 0);
 574         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
 575
 576         input_dev->name = "AD7879 Touchscreen";
 577         input_dev->phys = ts->phys;
 578         input_dev->dev.parent = dev;
 579         input_dev->id.bustype = bustype;
 580
 581         input_dev->open = ad7879_open;
 582         input_dev->close = ad7879_close;
 583
 584         input_set_drvdata(input_dev, ts);
 585
 586         input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
 587
 588         if (pdata) {
 589                 input_set_abs_params(input_dev, ABS_X,
 590                                 pdata->x_min ? : 0,
 591                                 pdata->x_max ? : MAX_12BIT,
 592                                 0, 0);
 593                 input_set_abs_params(input_dev, ABS_Y,
 594                                 pdata->y_min ? : 0,
 595                                 pdata->y_max ? : MAX_12BIT,
 596                                 0, 0);
 597                 input_set_abs_params(input_dev, ABS_PRESSURE,
 598                                 pdata->pressure_min,
 599                                 pdata->pressure_max ? : ~0,
 600                                 0, 0);
 601         } else {
 602                 input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
 603                 input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
 604                 input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
 605                 touchscreen_parse_properties(input_dev, false, NULL);
 606                 if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
 607                         dev_err(dev, "Touchscreen pressure is not specified\n");
 608                         return -EINVAL;
 609                 }
 610         }
 611
 612         err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
 613         if (err < 0) {
 614                 dev_err(dev, "Failed to write %s\n", input_dev->name);
 615                 return err;
 616         }
 617
 618         revid = ad7879_read(ts, AD7879_REG_REVID);
 619         input_dev->id.product = (revid & 0xff);
 620         input_dev->id.version = revid >> 8;
 621         if (input_dev->id.product != devid) {
 622                 dev_err(dev, "Failed to probe %s (%x vs %x)\n",
 623                         input_dev->name, devid, revid);
 624                 return -ENODEV;
 625         }
 626
 627         ts->cmd_crtl3 = AD7879_YPLUS_BIT |
 628                         AD7879_XPLUS_BIT |
 629                         AD7879_Z2_BIT |
 630                         AD7879_Z1_BIT |
 631                         AD7879_TEMPMASK_BIT |
 632                         AD7879_AUXVBATMASK_BIT |
 633                         AD7879_GPIOALERTMASK_BIT;
 634
 635         ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
 636                         AD7879_AVG(ts->averaging) |
 637                         AD7879_MFS(ts->median) |
 638                         AD7879_FCD(ts->first_conversion_delay);
 639
 640         ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
 641                         AD7879_ACQ(ts->acquisition_time) |
 642                         AD7879_TMR(ts->pen_down_acc_interval);
 643
 644         err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
 645                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 646                                         dev_name(dev), ts);
 647         if (err) {
 648                 dev_err(dev, "Failed to request IRQ: %d\n", err);
 649                 return err;
 650         }
 651
 652         __ad7879_disable(ts);
 653
 654         err = devm_device_add_group(dev, &ad7879_attr_group);
 655         if (err)
 656                 return err;
 657
 658         err = ad7879_gpio_add(ts, pdata);
 659         if (err)
 660                 return err;
 661
 662         err = input_register_device(input_dev);
 663         if (err)
 664                 return err;
 665
 666         dev_set_drvdata(dev, ts);
 667
 668         return 0;
 669 }
 670 EXPORT_SYMBOL(ad7879_probe);
 671
 672 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 673 MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
 674 MODULE_LICENSE("GPL");