kernel/drivers/staging/iio/cdc/ad7150.c

   1 /*
   2  * AD7150 capacitive sensor driver supporting AD7150/1/6
   3  *
   4  * Copyright 2010-2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/interrupt.h>
  10 #include <linux/device.h>
  11 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/module.h>
  15
  16 #include <linux/iio/iio.h>
  17 #include <linux/iio/sysfs.h>
  18 #include <linux/iio/events.h>
  19 /*
  20  * AD7150 registers definition
  21  */
  22
  23 #define AD7150_STATUS              0
  24 #define AD7150_STATUS_OUT1         (1 << 3)
  25 #define AD7150_STATUS_OUT2         (1 << 5)
  26 #define AD7150_CH1_DATA_HIGH       1
  27 #define AD7150_CH2_DATA_HIGH       3
  28 #define AD7150_CH1_AVG_HIGH        5
  29 #define AD7150_CH2_AVG_HIGH        7
  30 #define AD7150_CH1_SENSITIVITY     9
  31 #define AD7150_CH1_THR_HOLD_H      9
  32 #define AD7150_CH1_TIMEOUT         10
  33 #define AD7150_CH1_SETUP           11
  34 #define AD7150_CH2_SENSITIVITY     12
  35 #define AD7150_CH2_THR_HOLD_H      12
  36 #define AD7150_CH2_TIMEOUT         13
  37 #define AD7150_CH2_SETUP           14
  38 #define AD7150_CFG                 15
  39 #define AD7150_CFG_FIX             (1 << 7)
  40 #define AD7150_PD_TIMER            16
  41 #define AD7150_CH1_CAPDAC          17
  42 #define AD7150_CH2_CAPDAC          18
  43 #define AD7150_SN3                 19
  44 #define AD7150_SN2                 20
  45 #define AD7150_SN1                 21
  46 #define AD7150_SN0                 22
  47 #define AD7150_ID                  23
  48
  49 /**
  50  * struct ad7150_chip_info - instance specific chip data
  51  * @client: i2c client for this device
  52  * @current_event: device always has one type of event enabled.
  53  *      This element stores the event code of the current one.
  54  * @threshold: thresholds for simple capacitance value events
  55  * @thresh_sensitivity: threshold for simple capacitance offset
  56  *      from 'average' value.
  57  * @mag_sensitity: threshold for magnitude of capacitance offset from
  58  *      from 'average' value.
  59  * @thresh_timeout: a timeout, in samples from the moment an
  60  *      adaptive threshold event occurs to when the average
  61  *      value jumps to current value.
  62  * @mag_timeout: a timeout, in sample from the moment an
  63  *      adaptive magnitude event occurs to when the average
  64  *      value jumps to the current value.
  65  * @old_state: store state from previous event, allowing confirmation
  66  *      of new condition.
  67  * @conversion_mode: the current conversion mode.
  68  * @state_lock: ensure consistent state of this structure wrt the
  69  *      hardware.
  70  */
  71 struct ad7150_chip_info {
  72         struct i2c_client *client;
  73         u64 current_event;
  74         u16 threshold[2][2];
  75         u8 thresh_sensitivity[2][2];
  76         u8 mag_sensitivity[2][2];
  77         u8 thresh_timeout[2][2];
  78         u8 mag_timeout[2][2];
  79         int old_state;
  80         char *conversion_mode;
  81         struct mutex state_lock;
  82 };
  83
  84 /*
  85  * sysfs nodes
  86  */
  87
  88 static const u8 ad7150_addresses[][6] = {
  89         { AD7150_CH1_DATA_HIGH, AD7150_CH1_AVG_HIGH,
  90           AD7150_CH1_SETUP, AD7150_CH1_THR_HOLD_H,
  91           AD7150_CH1_SENSITIVITY, AD7150_CH1_TIMEOUT },
  92         { AD7150_CH2_DATA_HIGH, AD7150_CH2_AVG_HIGH,
  93           AD7150_CH2_SETUP, AD7150_CH2_THR_HOLD_H,
  94           AD7150_CH2_SENSITIVITY, AD7150_CH2_TIMEOUT },
  95 };
  96
  97 static int ad7150_read_raw(struct iio_dev *indio_dev,
  98                            struct iio_chan_spec const *chan,
  99                            int *val,
 100                            int *val2,
 101                            long mask)
 102 {
 103         int ret;
 104         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 105
 106         switch (mask) {
 107         case IIO_CHAN_INFO_RAW:
 108                 ret = i2c_smbus_read_word_data(chip->client,
 109                                         ad7150_addresses[chan->channel][0]);
 110                 if (ret < 0)
 111                         return ret;
 112                 *val = swab16(ret);
 113                 return IIO_VAL_INT;
 114         case IIO_CHAN_INFO_AVERAGE_RAW:
 115                 ret = i2c_smbus_read_word_data(chip->client,
 116                                         ad7150_addresses[chan->channel][1]);
 117                 if (ret < 0)
 118                         return ret;
 119                 *val = swab16(ret);
 120                 return IIO_VAL_INT;
 121         default:
 122                 return -EINVAL;
 123         }
 124 }
 125
 126 static int ad7150_read_event_config(struct iio_dev *indio_dev,
 127         const struct iio_chan_spec *chan, enum iio_event_type type,
 128         enum iio_event_direction dir)
 129 {
 130         int ret;
 131         u8 threshtype;
 132         bool adaptive;
 133         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 134
 135         ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
 136         if (ret < 0)
 137                 return ret;
 138
 139         threshtype = (ret >> 5) & 0x03;
 140         adaptive = !!(ret & 0x80);
 141
 142         switch (type) {
 143         case IIO_EV_TYPE_MAG_ADAPTIVE:
 144                 if (dir == IIO_EV_DIR_RISING)
 145                         return adaptive && (threshtype == 0x1);
 146                 return adaptive && (threshtype == 0x0);
 147         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 148                 if (dir == IIO_EV_DIR_RISING)
 149                         return adaptive && (threshtype == 0x3);
 150                 return adaptive && (threshtype == 0x2);
 151         case IIO_EV_TYPE_THRESH:
 152                 if (dir == IIO_EV_DIR_RISING)
 153                         return !adaptive && (threshtype == 0x1);
 154                 return !adaptive && (threshtype == 0x0);
 155         default:
 156                 break;
 157         }
 158         return -EINVAL;
 159 }
 160
 161 /* lock should be held */
 162 static int ad7150_write_event_params(struct iio_dev *indio_dev,
 163          unsigned int chan, enum iio_event_type type,
 164          enum iio_event_direction dir)
 165 {
 166         int ret;
 167         u16 value;
 168         u8 sens, timeout;
 169         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 170         int rising = (dir == IIO_EV_DIR_RISING);
 171         u64 event_code;
 172
 173         event_code = IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, chan, type, dir);
 174
 175         if (event_code != chip->current_event)
 176                 return 0;
 177
 178         switch (type) {
 179                 /* Note completely different from the adaptive versions */
 180         case IIO_EV_TYPE_THRESH:
 181                 value = chip->threshold[rising][chan];
 182                 ret = i2c_smbus_write_word_data(chip->client,
 183                                                 ad7150_addresses[chan][3],
 184                                                 swab16(value));
 185                 if (ret < 0)
 186                         return ret;
 187                 return 0;
 188         case IIO_EV_TYPE_MAG_ADAPTIVE:
 189                 sens = chip->mag_sensitivity[rising][chan];
 190                 timeout = chip->mag_timeout[rising][chan];
 191                 break;
 192         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 193                 sens = chip->thresh_sensitivity[rising][chan];
 194                 timeout = chip->thresh_timeout[rising][chan];
 195                 break;
 196         default:
 197                 return -EINVAL;
 198         }
 199         ret = i2c_smbus_write_byte_data(chip->client,
 200                                         ad7150_addresses[chan][4],
 201                                         sens);
 202         if (ret < 0)
 203                 return ret;
 204
 205         ret = i2c_smbus_write_byte_data(chip->client,
 206                                         ad7150_addresses[chan][5],
 207                                         timeout);
 208         if (ret < 0)
 209                 return ret;
 210
 211         return 0;
 212 }
 213
 214 static int ad7150_write_event_config(struct iio_dev *indio_dev,
 215         const struct iio_chan_spec *chan, enum iio_event_type type,
 216         enum iio_event_direction dir, int state)
 217 {
 218         u8 thresh_type, cfg, adaptive;
 219         int ret;
 220         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 221         int rising = (dir == IIO_EV_DIR_RISING);
 222         u64 event_code;
 223
 224         /* Something must always be turned on */
 225         if (state == 0)
 226                 return -EINVAL;
 227
 228         event_code = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, type, dir);
 229         if (event_code == chip->current_event)
 230                 return 0;
 231         mutex_lock(&chip->state_lock);
 232         ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
 233         if (ret < 0)
 234                 goto error_ret;
 235
 236         cfg = ret & ~((0x03 << 5) | (0x1 << 7));
 237
 238         switch (type) {
 239         case IIO_EV_TYPE_MAG_ADAPTIVE:
 240                 adaptive = 1;
 241                 if (rising)
 242                         thresh_type = 0x1;
 243                 else
 244                         thresh_type = 0x0;
 245                 break;
 246         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 247                 adaptive = 1;
 248                 if (rising)
 249                         thresh_type = 0x3;
 250                 else
 251                         thresh_type = 0x2;
 252                 break;
 253         case IIO_EV_TYPE_THRESH:
 254                 adaptive = 0;
 255                 if (rising)
 256                         thresh_type = 0x1;
 257                 else
 258                         thresh_type = 0x0;
 259                 break;
 260         default:
 261                 ret = -EINVAL;
 262                 goto error_ret;
 263         }
 264
 265         cfg |= (!adaptive << 7) | (thresh_type << 5);
 266
 267         ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
 268         if (ret < 0)
 269                 goto error_ret;
 270
 271         chip->current_event = event_code;
 272
 273         /* update control attributes */
 274         ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir);
 275 error_ret:
 276         mutex_unlock(&chip->state_lock);
 277
 278         return 0;
 279 }
 280
 281 static int ad7150_read_event_value(struct iio_dev *indio_dev,
 282                                    const struct iio_chan_spec *chan,
 283                                    enum iio_event_type type,
 284                                    enum iio_event_direction dir,
 285                                    enum iio_event_info info,
 286                                    int *val, int *val2)
 287 {
 288         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 289         int rising = (dir == IIO_EV_DIR_RISING);
 290
 291         /* Complex register sharing going on here */
 292         switch (type) {
 293         case IIO_EV_TYPE_MAG_ADAPTIVE:
 294                 *val = chip->mag_sensitivity[rising][chan->channel];
 295                 return IIO_VAL_INT;
 296         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 297                 *val = chip->thresh_sensitivity[rising][chan->channel];
 298                 return IIO_VAL_INT;
 299         case IIO_EV_TYPE_THRESH:
 300                 *val = chip->threshold[rising][chan->channel];
 301                 return IIO_VAL_INT;
 302         default:
 303                 return -EINVAL;
 304         }
 305 }
 306
 307 static int ad7150_write_event_value(struct iio_dev *indio_dev,
 308                                    const struct iio_chan_spec *chan,
 309                                    enum iio_event_type type,
 310                                    enum iio_event_direction dir,
 311                                    enum iio_event_info info,
 312                                    int val, int val2)
 313 {
 314         int ret;
 315         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 316         int rising = (dir == IIO_EV_DIR_RISING);
 317
 318         mutex_lock(&chip->state_lock);
 319         switch (type) {
 320         case IIO_EV_TYPE_MAG_ADAPTIVE:
 321                 chip->mag_sensitivity[rising][chan->channel] = val;
 322                 break;
 323         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 324                 chip->thresh_sensitivity[rising][chan->channel] = val;
 325                 break;
 326         case IIO_EV_TYPE_THRESH:
 327                 chip->threshold[rising][chan->channel] = val;
 328                 break;
 329         default:
 330                 ret = -EINVAL;
 331                 goto error_ret;
 332         }
 333
 334         /* write back if active */
 335         ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir);
 336
 337 error_ret:
 338         mutex_unlock(&chip->state_lock);
 339         return ret;
 340 }
 341
 342 static ssize_t ad7150_show_timeout(struct device *dev,
 343                                    struct device_attribute *attr,
 344                                    char *buf)
 345 {
 346         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 347         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 348         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 349         u8 value;
 350
 351         /* use the event code for consistency reasons */
 352         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 353         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
 354                         == IIO_EV_DIR_RISING);
 355
 356         switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
 357         case IIO_EV_TYPE_MAG_ADAPTIVE:
 358                 value = chip->mag_timeout[rising][chan];
 359                 break;
 360         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 361                 value = chip->thresh_timeout[rising][chan];
 362                 break;
 363         default:
 364                 return -EINVAL;
 365         }
 366
 367         return sprintf(buf, "%d\n", value);
 368 }
 369
 370 static ssize_t ad7150_store_timeout(struct device *dev,
 371                 struct device_attribute *attr,
 372                 const char *buf,
 373                 size_t len)
 374 {
 375         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 376         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 377         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 378         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 379         enum iio_event_direction dir;
 380         enum iio_event_type type;
 381         int rising;
 382         u8 data;
 383         int ret;
 384
 385         type = IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address);
 386         dir = IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address);
 387         rising = (dir == IIO_EV_DIR_RISING);
 388
 389         ret = kstrtou8(buf, 10, &data);
 390         if (ret < 0)
 391                 return ret;
 392
 393         mutex_lock(&chip->state_lock);
 394         switch (type) {
 395         case IIO_EV_TYPE_MAG_ADAPTIVE:
 396                 chip->mag_timeout[rising][chan] = data;
 397                 break;
 398         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 399                 chip->thresh_timeout[rising][chan] = data;
 400                 break;
 401         default:
 402                 ret = -EINVAL;
 403                 goto error_ret;
 404         }
 405
 406         ret = ad7150_write_event_params(indio_dev, chan, type, dir);
 407 error_ret:
 408         mutex_unlock(&chip->state_lock);
 409
 410         if (ret < 0)
 411                 return ret;
 412
 413         return len;
 414 }
 415
 416 #define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir)                \
 417         IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
 418                 S_IRUGO | S_IWUSR,                                      \
 419                 &ad7150_show_timeout,                                   \
 420                 &ad7150_store_timeout,                                  \
 421                 IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,                   \
 422                                      chan,                              \
 423                                      IIO_EV_TYPE_##ev_type,             \
 424                                      IIO_EV_DIR_##ev_dir))
 425 static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 426 static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 427 static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 428 static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 429 static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 430 static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 431 static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 432 static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 433
 434 static const struct iio_event_spec ad7150_events[] = {
 435         {
 436                 .type = IIO_EV_TYPE_THRESH,
 437                 .dir = IIO_EV_DIR_RISING,
 438                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 439                         BIT(IIO_EV_INFO_ENABLE),
 440         }, {
 441                 .type = IIO_EV_TYPE_THRESH,
 442                 .dir = IIO_EV_DIR_FALLING,
 443                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 444                         BIT(IIO_EV_INFO_ENABLE),
 445         }, {
 446                 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
 447                 .dir = IIO_EV_DIR_RISING,
 448                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 449                         BIT(IIO_EV_INFO_ENABLE),
 450         }, {
 451                 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
 452                 .dir = IIO_EV_DIR_FALLING,
 453                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 454                         BIT(IIO_EV_INFO_ENABLE),
 455         }, {
 456                 .type = IIO_EV_TYPE_MAG_ADAPTIVE,
 457                 .dir = IIO_EV_DIR_RISING,
 458                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 459                         BIT(IIO_EV_INFO_ENABLE),
 460         }, {
 461                 .type = IIO_EV_TYPE_MAG_ADAPTIVE,
 462                 .dir = IIO_EV_DIR_FALLING,
 463                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 464                         BIT(IIO_EV_INFO_ENABLE),
 465         },
 466 };
 467
 468 static const struct iio_chan_spec ad7150_channels[] = {
 469         {
 470                 .type = IIO_CAPACITANCE,
 471                 .indexed = 1,
 472                 .channel = 0,
 473                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 474                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),
 475                 .event_spec = ad7150_events,
 476                 .num_event_specs = ARRAY_SIZE(ad7150_events),
 477         }, {
 478                 .type = IIO_CAPACITANCE,
 479                 .indexed = 1,
 480                 .channel = 1,
 481                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 482                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),
 483                 .event_spec = ad7150_events,
 484                 .num_event_specs = ARRAY_SIZE(ad7150_events),
 485         },
 486 };
 487
 488 /*
 489  * threshold events
 490  */
 491
 492 static irqreturn_t ad7150_event_handler(int irq, void *private)
 493 {
 494         struct iio_dev *indio_dev = private;
 495         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 496         u8 int_status;
 497         s64 timestamp = iio_get_time_ns();
 498         int ret;
 499
 500         ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
 501         if (ret < 0)
 502                 return IRQ_HANDLED;
 503
 504         int_status = ret;
 505
 506         if ((int_status & AD7150_STATUS_OUT1) &&
 507             !(chip->old_state & AD7150_STATUS_OUT1))
 508                 iio_push_event(indio_dev,
 509                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 510                                                     0,
 511                                                     IIO_EV_TYPE_THRESH,
 512                                                     IIO_EV_DIR_RISING),
 513                                 timestamp);
 514         else if ((!(int_status & AD7150_STATUS_OUT1)) &&
 515                  (chip->old_state & AD7150_STATUS_OUT1))
 516                 iio_push_event(indio_dev,
 517                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 518                                                     0,
 519                                                     IIO_EV_TYPE_THRESH,
 520                                                     IIO_EV_DIR_FALLING),
 521                                timestamp);
 522
 523         if ((int_status & AD7150_STATUS_OUT2) &&
 524             !(chip->old_state & AD7150_STATUS_OUT2))
 525                 iio_push_event(indio_dev,
 526                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 527                                                     1,
 528                                                     IIO_EV_TYPE_THRESH,
 529                                                     IIO_EV_DIR_RISING),
 530                                timestamp);
 531         else if ((!(int_status & AD7150_STATUS_OUT2)) &&
 532                  (chip->old_state & AD7150_STATUS_OUT2))
 533                 iio_push_event(indio_dev,
 534                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 535                                                     1,
 536                                                     IIO_EV_TYPE_THRESH,
 537                                                     IIO_EV_DIR_FALLING),
 538                                timestamp);
 539         /* store the status to avoid repushing same events */
 540         chip->old_state = int_status;
 541
 542         return IRQ_HANDLED;
 543 }
 544
 545 /* Timeouts not currently handled by core */
 546 static struct attribute *ad7150_event_attributes[] = {
 547         &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
 548         .dev_attr.attr,
 549         &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
 550         .dev_attr.attr,
 551         &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
 552         .dev_attr.attr,
 553         &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
 554         .dev_attr.attr,
 555         &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
 556         .dev_attr.attr,
 557         &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
 558         .dev_attr.attr,
 559         &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
 560         .dev_attr.attr,
 561         &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
 562         .dev_attr.attr,
 563         NULL,
 564 };
 565
 566 static struct attribute_group ad7150_event_attribute_group = {
 567         .attrs = ad7150_event_attributes,
 568         .name = "events",
 569 };
 570
 571 static const struct iio_info ad7150_info = {
 572         .event_attrs = &ad7150_event_attribute_group,
 573         .driver_module = THIS_MODULE,
 574         .read_raw = &ad7150_read_raw,
 575         .read_event_config = &ad7150_read_event_config,
 576         .write_event_config = &ad7150_write_event_config,
 577         .read_event_value = &ad7150_read_event_value,
 578         .write_event_value = &ad7150_write_event_value,
 579 };
 580
 581 /*
 582  * device probe and remove
 583  */
 584
 585 static int ad7150_probe(struct i2c_client *client,
 586                 const struct i2c_device_id *id)
 587 {
 588         int ret;
 589         struct ad7150_chip_info *chip;
 590         struct iio_dev *indio_dev;
 591
 592         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 593         if (!indio_dev)
 594                 return -ENOMEM;
 595         chip = iio_priv(indio_dev);
 596         mutex_init(&chip->state_lock);
 597         /* this is only used for device removal purposes */
 598         i2c_set_clientdata(client, indio_dev);
 599
 600         chip->client = client;
 601
 602         indio_dev->name = id->name;
 603         indio_dev->channels = ad7150_channels;
 604         indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
 605         /* Establish that the iio_dev is a child of the i2c device */
 606         indio_dev->dev.parent = &client->dev;
 607
 608         indio_dev->info = &ad7150_info;
 609
 610         indio_dev->modes = INDIO_DIRECT_MODE;
 611
 612         if (client->irq) {
 613                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 614                                            NULL,
 615                                            &ad7150_event_handler,
 616                                            IRQF_TRIGGER_RISING |
 617                                            IRQF_TRIGGER_FALLING |
 618                                            IRQF_ONESHOT,
 619                                            "ad7150_irq1",
 620                                            indio_dev);
 621                 if (ret)
 622                         return ret;
 623         }
 624
 625         if (client->dev.platform_data) {
 626                 ret = devm_request_threaded_irq(&client->dev, *(unsigned int *)
 627                                            client->dev.platform_data,
 628                                            NULL,
 629                                            &ad7150_event_handler,
 630                                            IRQF_TRIGGER_RISING |
 631                                            IRQF_TRIGGER_FALLING |
 632                                            IRQF_ONESHOT,
 633                                            "ad7150_irq2",
 634                                            indio_dev);
 635                 if (ret)
 636                         return ret;
 637         }
 638
 639         ret = iio_device_register(indio_dev);
 640         if (ret)
 641                 return ret;
 642
 643         dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
 644                  id->name, client->irq);
 645
 646         return 0;
 647 }
 648
 649 static int ad7150_remove(struct i2c_client *client)
 650 {
 651         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 652
 653         iio_device_unregister(indio_dev);
 654
 655         return 0;
 656 }
 657
 658 static const struct i2c_device_id ad7150_id[] = {
 659         { "ad7150", 0 },
 660         { "ad7151", 0 },
 661         { "ad7156", 0 },
 662         {}
 663 };
 664
 665 MODULE_DEVICE_TABLE(i2c, ad7150_id);
 666
 667 static struct i2c_driver ad7150_driver = {
 668         .driver = {
 669                 .name = "ad7150",
 670         },
 671         .probe = ad7150_probe,
 672         .remove = ad7150_remove,
 673         .id_table = ad7150_id,
 674 };
 675 module_i2c_driver(ad7150_driver);
 676
 677 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 678 MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
 679 MODULE_LICENSE("GPL v2");