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         BIT(3)
  25 #define AD7150_STATUS_OUT2         BIT(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             BIT(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,
 164                                      enum iio_event_type type,
 165                                      enum iio_event_direction dir)
 166 {
 167         int ret;
 168         u16 value;
 169         u8 sens, timeout;
 170         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 171         int rising = (dir == IIO_EV_DIR_RISING);
 172         u64 event_code;
 173
 174         event_code = IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE, chan, type, dir);
 175
 176         if (event_code != chip->current_event)
 177                 return 0;
 178
 179         switch (type) {
 180                 /* Note completely different from the adaptive versions */
 181         case IIO_EV_TYPE_THRESH:
 182                 value = chip->threshold[rising][chan];
 183                 return i2c_smbus_write_word_data(chip->client,
 184                                                 ad7150_addresses[chan][3],
 185                                                 swab16(value));
 186         case IIO_EV_TYPE_MAG_ADAPTIVE:
 187                 sens = chip->mag_sensitivity[rising][chan];
 188                 timeout = chip->mag_timeout[rising][chan];
 189                 break;
 190         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 191                 sens = chip->thresh_sensitivity[rising][chan];
 192                 timeout = chip->thresh_timeout[rising][chan];
 193                 break;
 194         default:
 195                 return -EINVAL;
 196         }
 197         ret = i2c_smbus_write_byte_data(chip->client,
 198                                         ad7150_addresses[chan][4],
 199                                         sens);
 200         if (ret < 0)
 201                 return ret;
 202
 203         ret = i2c_smbus_write_byte_data(chip->client,
 204                                         ad7150_addresses[chan][5],
 205                                         timeout);
 206         if (ret < 0)
 207                 return ret;
 208
 209         return 0;
 210 }
 211
 212 static int ad7150_write_event_config(struct iio_dev *indio_dev,
 213                                      const struct iio_chan_spec *chan,
 214                                      enum iio_event_type type,
 215                                      enum iio_event_direction dir, int state)
 216 {
 217         u8 thresh_type, cfg, adaptive;
 218         int ret;
 219         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 220         int rising = (dir == IIO_EV_DIR_RISING);
 221         u64 event_code;
 222
 223         /* Something must always be turned on */
 224         if (!state)
 225                 return -EINVAL;
 226
 227         event_code = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, type, dir);
 228         if (event_code == chip->current_event)
 229                 return 0;
 230         mutex_lock(&chip->state_lock);
 231         ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
 232         if (ret < 0)
 233                 goto error_ret;
 234
 235         cfg = ret & ~((0x03 << 5) | (0x1 << 7));
 236
 237         switch (type) {
 238         case IIO_EV_TYPE_MAG_ADAPTIVE:
 239                 adaptive = 1;
 240                 if (rising)
 241                         thresh_type = 0x1;
 242                 else
 243                         thresh_type = 0x0;
 244                 break;
 245         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 246                 adaptive = 1;
 247                 if (rising)
 248                         thresh_type = 0x3;
 249                 else
 250                         thresh_type = 0x2;
 251                 break;
 252         case IIO_EV_TYPE_THRESH:
 253                 adaptive = 0;
 254                 if (rising)
 255                         thresh_type = 0x1;
 256                 else
 257                         thresh_type = 0x0;
 258                 break;
 259         default:
 260                 ret = -EINVAL;
 261                 goto error_ret;
 262         }
 263
 264         cfg |= (!adaptive << 7) | (thresh_type << 5);
 265
 266         ret = i2c_smbus_write_byte_data(chip->client, AD7150_CFG, cfg);
 267         if (ret < 0)
 268                 goto error_ret;
 269
 270         chip->current_event = event_code;
 271
 272         /* update control attributes */
 273         ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir);
 274 error_ret:
 275         mutex_unlock(&chip->state_lock);
 276
 277         return 0;
 278 }
 279
 280 static int ad7150_read_event_value(struct iio_dev *indio_dev,
 281                                    const struct iio_chan_spec *chan,
 282                                    enum iio_event_type type,
 283                                    enum iio_event_direction dir,
 284                                    enum iio_event_info info,
 285                                    int *val, int *val2)
 286 {
 287         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 288         int rising = (dir == IIO_EV_DIR_RISING);
 289
 290         /* Complex register sharing going on here */
 291         switch (type) {
 292         case IIO_EV_TYPE_MAG_ADAPTIVE:
 293                 *val = chip->mag_sensitivity[rising][chan->channel];
 294                 return IIO_VAL_INT;
 295         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 296                 *val = chip->thresh_sensitivity[rising][chan->channel];
 297                 return IIO_VAL_INT;
 298         case IIO_EV_TYPE_THRESH:
 299                 *val = chip->threshold[rising][chan->channel];
 300                 return IIO_VAL_INT;
 301         default:
 302                 return -EINVAL;
 303         }
 304 }
 305
 306 static int ad7150_write_event_value(struct iio_dev *indio_dev,
 307                                     const struct iio_chan_spec *chan,
 308                                     enum iio_event_type type,
 309                                     enum iio_event_direction dir,
 310                                     enum iio_event_info info,
 311                                     int val, int val2)
 312 {
 313         int ret;
 314         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 315         int rising = (dir == IIO_EV_DIR_RISING);
 316
 317         mutex_lock(&chip->state_lock);
 318         switch (type) {
 319         case IIO_EV_TYPE_MAG_ADAPTIVE:
 320                 chip->mag_sensitivity[rising][chan->channel] = val;
 321                 break;
 322         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 323                 chip->thresh_sensitivity[rising][chan->channel] = val;
 324                 break;
 325         case IIO_EV_TYPE_THRESH:
 326                 chip->threshold[rising][chan->channel] = val;
 327                 break;
 328         default:
 329                 ret = -EINVAL;
 330                 goto error_ret;
 331         }
 332
 333         /* write back if active */
 334         ret = ad7150_write_event_params(indio_dev, chan->channel, type, dir);
 335
 336 error_ret:
 337         mutex_unlock(&chip->state_lock);
 338         return ret;
 339 }
 340
 341 static ssize_t ad7150_show_timeout(struct device *dev,
 342                                    struct device_attribute *attr,
 343                                    char *buf)
 344 {
 345         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 346         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 347         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 348         u8 value;
 349
 350         /* use the event code for consistency reasons */
 351         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 352         int rising = !!(IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address)
 353                         == IIO_EV_DIR_RISING);
 354
 355         switch (IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address)) {
 356         case IIO_EV_TYPE_MAG_ADAPTIVE:
 357                 value = chip->mag_timeout[rising][chan];
 358                 break;
 359         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 360                 value = chip->thresh_timeout[rising][chan];
 361                 break;
 362         default:
 363                 return -EINVAL;
 364         }
 365
 366         return sprintf(buf, "%d\n", value);
 367 }
 368
 369 static ssize_t ad7150_store_timeout(struct device *dev,
 370                                     struct device_attribute *attr,
 371                                     const char *buf,
 372                                     size_t len)
 373 {
 374         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 375         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 376         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 377         int chan = IIO_EVENT_CODE_EXTRACT_CHAN(this_attr->address);
 378         enum iio_event_direction dir;
 379         enum iio_event_type type;
 380         int rising;
 381         u8 data;
 382         int ret;
 383
 384         type = IIO_EVENT_CODE_EXTRACT_TYPE(this_attr->address);
 385         dir = IIO_EVENT_CODE_EXTRACT_DIR(this_attr->address);
 386         rising = (dir == IIO_EV_DIR_RISING);
 387
 388         ret = kstrtou8(buf, 10, &data);
 389         if (ret < 0)
 390                 return ret;
 391
 392         mutex_lock(&chip->state_lock);
 393         switch (type) {
 394         case IIO_EV_TYPE_MAG_ADAPTIVE:
 395                 chip->mag_timeout[rising][chan] = data;
 396                 break;
 397         case IIO_EV_TYPE_THRESH_ADAPTIVE:
 398                 chip->thresh_timeout[rising][chan] = data;
 399                 break;
 400         default:
 401                 ret = -EINVAL;
 402                 goto error_ret;
 403         }
 404
 405         ret = ad7150_write_event_params(indio_dev, chan, type, dir);
 406 error_ret:
 407         mutex_unlock(&chip->state_lock);
 408
 409         if (ret < 0)
 410                 return ret;
 411
 412         return len;
 413 }
 414
 415 #define AD7150_TIMEOUT(chan, type, dir, ev_type, ev_dir)                \
 416         IIO_DEVICE_ATTR(in_capacitance##chan##_##type##_##dir##_timeout, \
 417                 S_IRUGO | S_IWUSR,                                      \
 418                 &ad7150_show_timeout,                                   \
 419                 &ad7150_store_timeout,                                  \
 420                 IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,                   \
 421                                      chan,                              \
 422                                      IIO_EV_TYPE_##ev_type,             \
 423                                      IIO_EV_DIR_##ev_dir))
 424 static AD7150_TIMEOUT(0, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 425 static AD7150_TIMEOUT(0, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 426 static AD7150_TIMEOUT(1, mag_adaptive, rising, MAG_ADAPTIVE, RISING);
 427 static AD7150_TIMEOUT(1, mag_adaptive, falling, MAG_ADAPTIVE, FALLING);
 428 static AD7150_TIMEOUT(0, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 429 static AD7150_TIMEOUT(0, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 430 static AD7150_TIMEOUT(1, thresh_adaptive, rising, THRESH_ADAPTIVE, RISING);
 431 static AD7150_TIMEOUT(1, thresh_adaptive, falling, THRESH_ADAPTIVE, FALLING);
 432
 433 static const struct iio_event_spec ad7150_events[] = {
 434         {
 435                 .type = IIO_EV_TYPE_THRESH,
 436                 .dir = IIO_EV_DIR_RISING,
 437                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 438                         BIT(IIO_EV_INFO_ENABLE),
 439         }, {
 440                 .type = IIO_EV_TYPE_THRESH,
 441                 .dir = IIO_EV_DIR_FALLING,
 442                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 443                         BIT(IIO_EV_INFO_ENABLE),
 444         }, {
 445                 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
 446                 .dir = IIO_EV_DIR_RISING,
 447                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 448                         BIT(IIO_EV_INFO_ENABLE),
 449         }, {
 450                 .type = IIO_EV_TYPE_THRESH_ADAPTIVE,
 451                 .dir = IIO_EV_DIR_FALLING,
 452                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 453                         BIT(IIO_EV_INFO_ENABLE),
 454         }, {
 455                 .type = IIO_EV_TYPE_MAG_ADAPTIVE,
 456                 .dir = IIO_EV_DIR_RISING,
 457                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 458                         BIT(IIO_EV_INFO_ENABLE),
 459         }, {
 460                 .type = IIO_EV_TYPE_MAG_ADAPTIVE,
 461                 .dir = IIO_EV_DIR_FALLING,
 462                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 463                         BIT(IIO_EV_INFO_ENABLE),
 464         },
 465 };
 466
 467 static const struct iio_chan_spec ad7150_channels[] = {
 468         {
 469                 .type = IIO_CAPACITANCE,
 470                 .indexed = 1,
 471                 .channel = 0,
 472                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 473                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),
 474                 .event_spec = ad7150_events,
 475                 .num_event_specs = ARRAY_SIZE(ad7150_events),
 476         }, {
 477                 .type = IIO_CAPACITANCE,
 478                 .indexed = 1,
 479                 .channel = 1,
 480                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 481                 BIT(IIO_CHAN_INFO_AVERAGE_RAW),
 482                 .event_spec = ad7150_events,
 483                 .num_event_specs = ARRAY_SIZE(ad7150_events),
 484         },
 485 };
 486
 487 /*
 488  * threshold events
 489  */
 490
 491 static irqreturn_t ad7150_event_handler(int irq, void *private)
 492 {
 493         struct iio_dev *indio_dev = private;
 494         struct ad7150_chip_info *chip = iio_priv(indio_dev);
 495         u8 int_status;
 496         s64 timestamp = iio_get_time_ns();
 497         int ret;
 498
 499         ret = i2c_smbus_read_byte_data(chip->client, AD7150_STATUS);
 500         if (ret < 0)
 501                 return IRQ_HANDLED;
 502
 503         int_status = ret;
 504
 505         if ((int_status & AD7150_STATUS_OUT1) &&
 506             !(chip->old_state & AD7150_STATUS_OUT1))
 507                 iio_push_event(indio_dev,
 508                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 509                                                     0,
 510                                                     IIO_EV_TYPE_THRESH,
 511                                                     IIO_EV_DIR_RISING),
 512                                 timestamp);
 513         else if ((!(int_status & AD7150_STATUS_OUT1)) &&
 514                  (chip->old_state & AD7150_STATUS_OUT1))
 515                 iio_push_event(indio_dev,
 516                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 517                                                     0,
 518                                                     IIO_EV_TYPE_THRESH,
 519                                                     IIO_EV_DIR_FALLING),
 520                                timestamp);
 521
 522         if ((int_status & AD7150_STATUS_OUT2) &&
 523             !(chip->old_state & AD7150_STATUS_OUT2))
 524                 iio_push_event(indio_dev,
 525                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 526                                                     1,
 527                                                     IIO_EV_TYPE_THRESH,
 528                                                     IIO_EV_DIR_RISING),
 529                                timestamp);
 530         else if ((!(int_status & AD7150_STATUS_OUT2)) &&
 531                  (chip->old_state & AD7150_STATUS_OUT2))
 532                 iio_push_event(indio_dev,
 533                                IIO_UNMOD_EVENT_CODE(IIO_CAPACITANCE,
 534                                                     1,
 535                                                     IIO_EV_TYPE_THRESH,
 536                                                     IIO_EV_DIR_FALLING),
 537                                timestamp);
 538         /* store the status to avoid repushing same events */
 539         chip->old_state = int_status;
 540
 541         return IRQ_HANDLED;
 542 }
 543
 544 /* Timeouts not currently handled by core */
 545 static struct attribute *ad7150_event_attributes[] = {
 546         &iio_dev_attr_in_capacitance0_mag_adaptive_rising_timeout
 547         .dev_attr.attr,
 548         &iio_dev_attr_in_capacitance0_mag_adaptive_falling_timeout
 549         .dev_attr.attr,
 550         &iio_dev_attr_in_capacitance1_mag_adaptive_rising_timeout
 551         .dev_attr.attr,
 552         &iio_dev_attr_in_capacitance1_mag_adaptive_falling_timeout
 553         .dev_attr.attr,
 554         &iio_dev_attr_in_capacitance0_thresh_adaptive_rising_timeout
 555         .dev_attr.attr,
 556         &iio_dev_attr_in_capacitance0_thresh_adaptive_falling_timeout
 557         .dev_attr.attr,
 558         &iio_dev_attr_in_capacitance1_thresh_adaptive_rising_timeout
 559         .dev_attr.attr,
 560         &iio_dev_attr_in_capacitance1_thresh_adaptive_falling_timeout
 561         .dev_attr.attr,
 562         NULL,
 563 };
 564
 565 static struct attribute_group ad7150_event_attribute_group = {
 566         .attrs = ad7150_event_attributes,
 567         .name = "events",
 568 };
 569
 570 static const struct iio_info ad7150_info = {
 571         .event_attrs = &ad7150_event_attribute_group,
 572         .driver_module = THIS_MODULE,
 573         .read_raw = &ad7150_read_raw,
 574         .read_event_config = &ad7150_read_event_config,
 575         .write_event_config = &ad7150_write_event_config,
 576         .read_event_value = &ad7150_read_event_value,
 577         .write_event_value = &ad7150_write_event_value,
 578 };
 579
 580 /*
 581  * device probe and remove
 582  */
 583
 584 static int ad7150_probe(struct i2c_client *client,
 585                         const struct i2c_device_id *id)
 586 {
 587         int ret;
 588         struct ad7150_chip_info *chip;
 589         struct iio_dev *indio_dev;
 590
 591         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
 592         if (!indio_dev)
 593                 return -ENOMEM;
 594         chip = iio_priv(indio_dev);
 595         mutex_init(&chip->state_lock);
 596         /* this is only used for device removal purposes */
 597         i2c_set_clientdata(client, indio_dev);
 598
 599         chip->client = client;
 600
 601         indio_dev->name = id->name;
 602         indio_dev->channels = ad7150_channels;
 603         indio_dev->num_channels = ARRAY_SIZE(ad7150_channels);
 604         /* Establish that the iio_dev is a child of the i2c device */
 605         indio_dev->dev.parent = &client->dev;
 606
 607         indio_dev->info = &ad7150_info;
 608
 609         indio_dev->modes = INDIO_DIRECT_MODE;
 610
 611         if (client->irq) {
 612                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 613                                            NULL,
 614                                            &ad7150_event_handler,
 615                                            IRQF_TRIGGER_RISING |
 616                                            IRQF_TRIGGER_FALLING |
 617                                            IRQF_ONESHOT,
 618                                            "ad7150_irq1",
 619                                            indio_dev);
 620                 if (ret)
 621                         return ret;
 622         }
 623
 624         if (client->dev.platform_data) {
 625                 ret = devm_request_threaded_irq(&client->dev, *(unsigned int *)
 626                                            client->dev.platform_data,
 627                                            NULL,
 628                                            &ad7150_event_handler,
 629                                            IRQF_TRIGGER_RISING |
 630                                            IRQF_TRIGGER_FALLING |
 631                                            IRQF_ONESHOT,
 632                                            "ad7150_irq2",
 633                                            indio_dev);
 634                 if (ret)
 635                         return ret;
 636         }
 637
 638         ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
 639         if (ret)
 640                 return ret;
 641
 642         dev_info(&client->dev, "%s capacitive sensor registered,irq: %d\n",
 643                  id->name, client->irq);
 644
 645         return 0;
 646 }
 647
 648 static const struct i2c_device_id ad7150_id[] = {
 649         { "ad7150", 0 },
 650         { "ad7151", 0 },
 651         { "ad7156", 0 },
 652         {}
 653 };
 654
 655 MODULE_DEVICE_TABLE(i2c, ad7150_id);
 656
 657 static struct i2c_driver ad7150_driver = {
 658         .driver = {
 659                 .name = "ad7150",
 660         },
 661         .probe = ad7150_probe,
 662         .id_table = ad7150_id,
 663 };
 664 module_i2c_driver(ad7150_driver);
 665
 666 MODULE_AUTHOR("Barry Song <[email protected]>");
 667 MODULE_DESCRIPTION("Analog Devices AD7150/1/6 capacitive sensor driver");
 668 MODULE_LICENSE("GPL v2");