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, u64 event_code)
 127 {
 128         int ret;
 129         u8 threshtype;
 130         bool adaptive;
 131         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 132         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 133                         IIO_EV_DIR_RISING);
 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 (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
 143         case IIO_EV_TYPE_MAG_ADAPTIVE:
 144                 if (rising)
 145                         return adaptive && (threshtype == 0x1);
 146                 else
 147                         return adaptive && (threshtype == 0x0);
 148         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 149                 if (rising)
 150                         return adaptive && (threshtype == 0x3);
 151                 else
 152                         return adaptive && (threshtype == 0x2);
 153
 154         case IIO_EV_TYPE_THRESH:
 155                 if (rising)
 156                         return !adaptive && (threshtype == 0x1);
 157                 else
 158                         return !adaptive && (threshtype == 0x0);
 159         }
 160         return -EINVAL;
 161 }
 162
 163 /* lock should be held */
 164 static int ad7150_write_event_params(struct iio_dev *indio_dev, u64 event_code)
 165 {
 166         int ret;
 167         u16 value;
 168         u8 sens, timeout;
 169         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 170         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 171         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 172                         IIO_EV_DIR_RISING);
 173
 174         if (event_code != chip->current_event)
 175                 return 0;
 176
 177         switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
 178                 /* Note completely different from the adaptive versions */
 179         case IIO_EV_TYPE_THRESH:
 180                 value = chip->threshold[rising][chan];
 181                 ret = i2c_smbus_write_word_data(chip->client,
 182                                                 ad7150_addresses[chan][3],
 183                                                 swab16(value));
 184                 if (ret < 0)
 185                         return ret;
 186                 return 0;
 187         case IIO_EV_TYPE_MAG_ADAPTIVE:
 188                 sens = chip->mag_sensitivity[rising][chan];
 189                 timeout = chip->mag_timeout[rising][chan];
 190                 break;
 191         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 192                 sens = chip->thresh_sensitivity[rising][chan];
 193                 timeout = chip->thresh_timeout[rising][chan];
 194                 break;
 195         default:
 196                 return -EINVAL;
 197         }
 198         ret = i2c_smbus_write_byte_data(chip->client,
 199                                         ad7150_addresses[chan][4],
 200                                         sens);
 201         if (ret < 0)
 202                 return ret;
 203
 204         ret = i2c_smbus_write_byte_data(chip->client,
 205                                         ad7150_addresses[chan][5],
 206                                         timeout);
 207         if (ret < 0)
 208                 return ret;
 209
 210         return 0;
 211 }
 212
 213 static int ad7150_write_event_config(struct iio_dev *indio_dev,
 214                                      u64 event_code, int state)
 215 {
 216         u8 thresh_type, cfg, adaptive;
 217         int ret;
 218         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 219         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 220                         IIO_EV_DIR_RISING);
 221
 222         /* Something must always be turned on */
 223         if (state == 0)
 224                 return -EINVAL;
 225
 226         if (event_code == chip->current_event)
 227                 return 0;
 228         mutex_lock(&chip->state_lock);
 229         ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
 230         if (ret < 0)
 231                 goto error_ret;
 232
 233         cfg = ret & ~((0x03 << 5) | (0x1 << 7));
 234
 235         switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
 236         case IIO_EV_TYPE_MAG_ADAPTIVE:
 237                 adaptive = 1;
 238                 if (rising)
 239                         thresh_type = 0x1;
 240                 else
 241                         thresh_type = 0x0;
 242                 break;
 243         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 244                 adaptive = 1;
 245                 if (rising)
 246                         thresh_type = 0x3;
 247                 else
 248                         thresh_type = 0x2;
 249                 break;
 250         case IIO_EV_TYPE_THRESH:
 251                 adaptive = 0;
 252                 if (rising)
 253                         thresh_type = 0x1;
 254                 else
 255                         thresh_type = 0x0;
 256                 break;
 257         default:
 258                 ret = -EINVAL;
 259                 goto error_ret;
 260         }
 261
 262         cfg |= (!adaptive << 7) | (thresh_type << 5);
 263
 264         ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
 265         if (ret < 0)
 266                 goto error_ret;
 267
 268         chip->current_event = event_code;
 269
 270         /* update control attributes */
 271         ret = ad7150_write_event_params(indio_dev, event_code);
 272 error_ret:
 273         mutex_unlock(&chip->state_lock);
 274
 275         return 0;
 276 }
 277
 278 static int ad7150_read_event_value(struct iio_dev *indio_dev,
 279                                    u64 event_code,
 280                                    int *val)
 281 {
 282         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 283         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 284         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 285                         IIO_EV_DIR_RISING);
 286
 287         /* Complex register sharing going on here */
 288         switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
 289         case IIO_EV_TYPE_MAG_ADAPTIVE:
 290                 *val = chip->mag_sensitivity[rising][chan];
 291                 return 0;
 292
 293         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 294                 *val = chip->thresh_sensitivity[rising][chan];
 295                 return 0;
 296
 297         case IIO_EV_TYPE_THRESH:
 298                 *val = chip->threshold[rising][chan];
 299                 return 0;
 300
 301         default:
 302                 return -EINVAL;
 303         };
 304 }
 305
 306 static int ad7150_write_event_value(struct iio_dev *indio_dev,
 307                                    u64 event_code,
 308                                    int val)
 309 {
 310         int ret;
 311         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 312         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 313         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 314                         IIO_EV_DIR_RISING);
 315
 316         mutex_lock(&chip->state_lock);
 317         switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
 318         case IIO_EV_TYPE_MAG_ADAPTIVE:
 319                 chip->mag_sensitivity[rising][chan] = val;
 320                 break;
 321         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 322                 chip->thresh_sensitivity[rising][chan] = val;
 323                 break;
 324         case IIO_EV_TYPE_THRESH:
 325                 chip->threshold[rising][chan] = val;
 326                 break;
 327         default:
 328                 ret = -EINVAL;
 329                 goto error_ret;
 330         }
 331
 332         /* write back if active */
 333         ret = ad7150_write_event_params(indio_dev, event_code);
 334
 335 error_ret:
 336         mutex_unlock(&chip->state_lock);
 337         return ret;
 338 }
 339
 340 static ssize_t ad7150_show_timeout(struct device *dev,
 341                                    struct device_attribute *attr,
 342                                    char *buf)
 343 {
 344         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 345         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 346         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 347         u8 value;
 348
 349         /* use the event code for consistency reasons */
 350         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 351         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
 352                         == IIO_EV_DIR_RISING);
 353
 354         switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
 355         case IIO_EV_TYPE_MAG_ADAPTIVE:
 356                 value = chip->mag_timeout[rising][chan];
 357                 break;
 358         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 359                 value = chip->thresh_timeout[rising][chan];
 360                 break;
 361         default:
 362                 return -EINVAL;
 363         }
 364
 365         return sprintf(buf, "%d\n", value);
 366 }
 367
 368 static ssize_t ad7150_store_timeout(struct device *dev,
 369                 struct device_attribute *attr,
 370                 const char *buf,
 371                 size_t len)
 372 {
 373         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 374         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 375         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 376         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 377         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address) ==
 378                         IIO_EV_DIR_RISING);
 379         u8 data;
 380         int ret;
 381
 382         ret = kstrtou8(buf, 10, &data);
 383         if (ret < 0)
 384                 return ret;
 385
 386         mutex_lock(&chip->state_lock);
 387         switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
 388         case IIO_EV_TYPE_MAG_ADAPTIVE:
 389                 chip->mag_timeout[rising][chan] = data;
 390                 break;
 391         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 392                 chip->thresh_timeout[rising][chan] = data;
 393                 break;
 394         default:
 395                 ret = -EINVAL;
 396                 goto error_ret;
 397         }
 398
 399         ret = ad7150_write_event_params(indio_dev, this_attr->address);
 400 error_ret:
 401         mutex_unlock(&chip->state_lock);
 402
 403         if (ret < 0)
 404                 return ret;
 405
 406         return len;
 407 }
 408
 409 #define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir)                \
 410         IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
 411                 S_IRUGO | S_IWUSR,                                      \
 412                 &ad7150_show_timeout,                                   \
 413                 &ad7150_store_timeout,                                  \
 414                 IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,                   \
 415                                      chan,                              \
 416                                      IIO_EV_TYPE_##ev_type,             \
 417                                      IIO_EV_DIR_##ev_dir))
 418 static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 419 static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 420 static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 421 static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 422 static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 423 static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 424 static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 425 static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 426
 427 static const struct iio_chan_spec ad7150_channels[] = {
 428         {
 429                 .type = IIO_CAPACITANCE,
 430                 .indexed = 1,
 431                 .channel = 0,
 432                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
 433                 IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT,
 434                 .event_mask =
 435                 IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
 436                 IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
 437                 IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
 438                 IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
 439                 IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
 440                 IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
 441         }, {
 442                 .type = IIO_CAPACITANCE,
 443                 .indexed = 1,
 444                 .channel = 1,
 445                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
 446                 IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT,
 447                 .event_mask =
 448                 IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) |
 449                 IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) |
 450                 IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_RISING) |
 451                 IIO_EV_BIT(IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_DIR_FALLING) |
 452                 IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_RISING) |
 453                 IIO_EV_BIT(IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_DIR_FALLING)
 454         },
 455 };
 456
 457 /*
 458  * threshold events
 459  */
 460
 461 static irqreturn_t ad7150_event_handler(int irq, void *private)
 462 {
 463         struct iio_dev *indio_dev = private;
 464         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 465         u8 int_status;
 466         s64 timestamp = iio_get_time_ns();
 467         int ret;
 468
 469         ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
 470         if (ret < 0)
 471                 return IRQ_HANDLED;
 472
 473         int_status = ret;
 474
 475         if ((int_status & AD7150_STATUS_OUT1) &&
 476             !(chip->old_state & AD7150_STATUS_OUT1))
 477                 iio_push_event(indio_dev,
 478                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 479                                                     0,
 480                                                     IIO_EV_TYPE_THRESH,
 481                                                     IIO_EV_DIR_RISING),
 482                                 timestamp);
 483         else if ((!(int_status & AD7150_STATUS_OUT1)) &&
 484                  (chip->old_state & AD7150_STATUS_OUT1))
 485                 iio_push_event(indio_dev,
 486                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 487                                                     0,
 488                                                     IIO_EV_TYPE_THRESH,
 489                                                     IIO_EV_DIR_FALLING),
 490                                timestamp);
 491
 492         if ((int_status & AD7150_STATUS_OUT2) &&
 493             !(chip->old_state & AD7150_STATUS_OUT2))
 494                 iio_push_event(indio_dev,
 495                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 496                                                     1,
 497                                                     IIO_EV_TYPE_THRESH,
 498                                                     IIO_EV_DIR_RISING),
 499                                timestamp);
 500         else if ((!(int_status & AD7150_STATUS_OUT2)) &&
 501                  (chip->old_state & AD7150_STATUS_OUT2))
 502                 iio_push_event(indio_dev,
 503                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 504                                                     1,
 505                                                     IIO_EV_TYPE_THRESH,
 506                                                     IIO_EV_DIR_FALLING),
 507                                timestamp);
 508         /* store the status to avoid repushing same events */
 509         chip->old_state = int_status;
 510
 511         return IRQ_HANDLED;
 512 }
 513
 514 /* Timeouts not currently handled by core */
 515 static struct attribute *ad7150_event_attributes[] = {
 516         &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
 517         .dev_attr.attr,
 518         &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
 519         .dev_attr.attr,
 520         &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
 521         .dev_attr.attr,
 522         &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
 523         .dev_attr.attr,
 524         &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
 525         .dev_attr.attr,
 526         &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
 527         .dev_attr.attr,
 528         &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
 529         .dev_attr.attr,
 530         &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
 531         .dev_attr.attr,
 532         NULL,
 533 };
 534
 535 static struct attribute_group ad7150_event_attribute_group = {
 536         .attrs = ad7150_event_attributes,
 537         .name = "events",
 538 };
 539
 540 static const struct iio_info ad7150_info = {
 541         .event_attrs = &ad7150_event_attribute_group,
 542         .driver_module = THIS_MODULE,
 543         .read_raw = &ad7150_read_raw,
 544         .read_event_config = &ad7150_read_event_config,
 545         .write_event_config = &ad7150_write_event_config,
 546         .read_event_value = &ad7150_read_event_value,
 547         .write_event_value = &ad7150_write_event_value,
 548 };
 549
 550 /*
 551  * device probe and remove
 552  */
 553
 554 static int ad7150_probe(struct i2c_client *client,
 555                 const struct i2c_device_id *id)
 556 {
 557         int ret;
 558         struct ad7150_chip_info *chip;
 559         struct iio_dev *indio_dev;
 560
 561         indio_dev = iio_device_alloc(sizeof(*chip));
 562         if (indio_dev == NULL) {
 563                 ret = -ENOMEM;
 564                 goto error_ret;
 565         }
 566         chip = iio_priv(indio_dev);
 567         mutex_init(&chip->state_lock);
 568         /* this is only used for device removal purposes */
 569         i2c_set_clientdata(client, indio_dev);
 570
 571         chip->client = client;
 572
 573         indio_dev->name = id->name;
 574         indio_dev->channels = ad7150_channels;
 575         indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
 576         /* Establish that the iio_dev is a child of the i2c device */
 577         indio_dev->dev.parent = &client->dev;
 578
 579         indio_dev->info = &ad7150_info;
 580
 581         indio_dev->modes = INDIO_DIRECT_MODE;
 582
 583         if (client->irq) {
 584                 ret = request_threaded_irq(client->irq,
 585                                            NULL,
 586                                            &ad7150_event_handler,
 587                                            IRQF_TRIGGER_RISING |
 588                                            IRQF_TRIGGER_FALLING |
 589                                            IRQF_ONESHOT,
 590                                            "ad7150_irq1",
 591                                            indio_dev);
 592                 if (ret)
 593                         goto error_free_dev;
 594         }
 595
 596         if (client->dev.platform_data) {
 597                 ret = request_threaded_irq(*(unsigned int *)
 598                                            client->dev.platform_data,
 599                                            NULL,
 600                                            &ad7150_event_handler,
 601                                            IRQF_TRIGGER_RISING |
 602                                            IRQF_TRIGGER_FALLING |
 603                                            IRQF_ONESHOT,
 604                                            "ad7150_irq2",
 605                                            indio_dev);
 606                 if (ret)
 607                         goto error_free_irq;
 608         }
 609
 610         ret = iio_device_register(indio_dev);
 611         if (ret)
 612                 goto error_free_irq2;
 613
 614         dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
 615                  id->name, client->irq);
 616
 617         return 0;
 618 error_free_irq2:
 619         if (client->dev.platform_data)
 620                 free_irq(*(unsigned int *)client->dev.platform_data,
 621                          indio_dev);
 622 error_free_irq:
 623         if (client->irq)
 624                 free_irq(client->irq, indio_dev);
 625 error_free_dev:
 626         iio_device_free(indio_dev);
 627 error_ret:
 628         return ret;
 629 }
 630
 631 static int ad7150_remove(struct i2c_client *client)
 632 {
 633         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 634
 635         iio_device_unregister(indio_dev);
 636         if (client->irq)
 637                 free_irq(client->irq, indio_dev);
 638
 639         if (client->dev.platform_data)
 640                 free_irq(*(unsigned int *)client->dev.platform_data, indio_dev);
 641
 642         iio_device_free(indio_dev);
 643
 644         return 0;
 645 }
 646
 647 static const struct i2c_device_id ad7150_id[] = {
 648         { "ad7150", 0 },
 649         { "ad7151", 0 },
 650         { "ad7156", 0 },
 651         {}
 652 };
 653
 654 MODULE_DEVICE_TABLE(i2c, ad7150_id);
 655
 656 static struct i2c_driver ad7150_driver = {
 657         .driver = {
 658                 .name = "ad7150",
 659         },
 660         .probe = ad7150_probe,
 661         .remove = ad7150_remove,
 662         .id_table = ad7150_id,
 663 };
 664 module_i2c_driver(ad7150_driver);
 665
 666 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
 667 MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
 668 MODULE_LICENSE("GPL v2");