drivers/iio/adc/ti-ads1015.c

   1 /*
   2  * ADS1015 - Texas Instruments Analog-to-Digital Converter
   3  *
   4  * Copyright (c) 2016, Intel Corporation.
   5  *
   6  * This file is subject to the terms and conditions of version 2 of
   7  * the GNU General Public License.  See the file COPYING in the main
   8  * directory of this archive for more details.
   9  *
  10  * IIO driver for ADS1015 ADC 7-bit I2C slave address:
  11  *      * 0x48 - ADDR connected to Ground
  12  *      * 0x49 - ADDR connected to Vdd
  13  *      * 0x4A - ADDR connected to SDA
  14  *      * 0x4B - ADDR connected to SCL
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/init.h>
  20 #include <linux/i2c.h>
  21 #include <linux/regmap.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/mutex.h>
  24 #include <linux/delay.h>
  25
  26 #include <linux/i2c/ads1015.h>
  27
  28 #include <linux/iio/iio.h>
  29 #include <linux/iio/types.h>
  30 #include <linux/iio/sysfs.h>
  31 #include <linux/iio/buffer.h>
  32 #include <linux/iio/triggered_buffer.h>
  33 #include <linux/iio/trigger_consumer.h>
  34
  35 #define ADS1015_DRV_NAME "ads1015"
  36
  37 #define ADS1015_CONV_REG        0x00
  38 #define ADS1015_CFG_REG         0x01
  39
  40 #define ADS1015_CFG_DR_SHIFT    5
  41 #define ADS1015_CFG_MOD_SHIFT   8
  42 #define ADS1015_CFG_PGA_SHIFT   9
  43 #define ADS1015_CFG_MUX_SHIFT   12
  44
  45 #define ADS1015_CFG_DR_MASK     GENMASK(7, 5)
  46 #define ADS1015_CFG_MOD_MASK    BIT(8)
  47 #define ADS1015_CFG_PGA_MASK    GENMASK(11, 9)
  48 #define ADS1015_CFG_MUX_MASK    GENMASK(14, 12)
  49
  50 /* device operating modes */
  51 #define ADS1015_CONTINUOUS      0
  52 #define ADS1015_SINGLESHOT      1
  53
  54 #define ADS1015_SLEEP_DELAY_MS          2000
  55 #define ADS1015_DEFAULT_PGA             2
  56 #define ADS1015_DEFAULT_DATA_RATE       4
  57 #define ADS1015_DEFAULT_CHAN            0
  58
  59 enum chip_ids {
  60         ADS1015,
  61         ADS1115,
  62 };
  63
  64 enum ads1015_channels {
  65         ADS1015_AIN0_AIN1 = 0,
  66         ADS1015_AIN0_AIN3,
  67         ADS1015_AIN1_AIN3,
  68         ADS1015_AIN2_AIN3,
  69         ADS1015_AIN0,
  70         ADS1015_AIN1,
  71         ADS1015_AIN2,
  72         ADS1015_AIN3,
  73         ADS1015_TIMESTAMP,
  74 };
  75
  76 static const unsigned int ads1015_data_rate[] = {
  77         128, 250, 490, 920, 1600, 2400, 3300, 3300
  78 };
  79
  80 static const unsigned int ads1115_data_rate[] = {
  81         8, 16, 32, 64, 128, 250, 475, 860
  82 };
  83
  84 static const struct {
  85         int scale;
  86         int uscale;
  87 } ads1015_scale[] = {
  88         {3, 0},
  89         {2, 0},
  90         {1, 0},
  91         {0, 500000},
  92         {0, 250000},
  93         {0, 125000},
  94         {0, 125000},
  95         {0, 125000},
  96 };
  97
  98 #define ADS1015_V_CHAN(_chan, _addr) {                          \
  99         .type = IIO_VOLTAGE,                                    \
 100         .indexed = 1,                                           \
 101         .address = _addr,                                       \
 102         .channel = _chan,                                       \
 103         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 104                                 BIT(IIO_CHAN_INFO_SCALE) |      \
 105                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),   \
 106         .scan_index = _addr,                                    \
 107         .scan_type = {                                          \
 108                 .sign = 's',                                    \
 109                 .realbits = 12,                                 \
 110                 .storagebits = 16,                              \
 111                 .shift = 4,                                     \
 112                 .endianness = IIO_CPU,                          \
 113         },                                                      \
 114         .datasheet_name = "AIN"#_chan,                          \
 115 }
 116
 117 #define ADS1015_V_DIFF_CHAN(_chan, _chan2, _addr) {             \
 118         .type = IIO_VOLTAGE,                                    \
 119         .differential = 1,                                      \
 120         .indexed = 1,                                           \
 121         .address = _addr,                                       \
 122         .channel = _chan,                                       \
 123         .channel2 = _chan2,                                     \
 124         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 125                                 BIT(IIO_CHAN_INFO_SCALE) |      \
 126                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),   \
 127         .scan_index = _addr,                                    \
 128         .scan_type = {                                          \
 129                 .sign = 's',                                    \
 130                 .realbits = 12,                                 \
 131                 .storagebits = 16,                              \
 132                 .shift = 4,                                     \
 133                 .endianness = IIO_CPU,                          \
 134         },                                                      \
 135         .datasheet_name = "AIN"#_chan"-AIN"#_chan2,             \
 136 }
 137
 138 #define ADS1115_V_CHAN(_chan, _addr) {                          \
 139         .type = IIO_VOLTAGE,                                    \
 140         .indexed = 1,                                           \
 141         .address = _addr,                                       \
 142         .channel = _chan,                                       \
 143         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 144                                 BIT(IIO_CHAN_INFO_SCALE) |      \
 145                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),   \
 146         .scan_index = _addr,                                    \
 147         .scan_type = {                                          \
 148                 .sign = 's',                                    \
 149                 .realbits = 16,                                 \
 150                 .storagebits = 16,                              \
 151                 .endianness = IIO_CPU,                          \
 152         },                                                      \
 153         .datasheet_name = "AIN"#_chan,                          \
 154 }
 155
 156 #define ADS1115_V_DIFF_CHAN(_chan, _chan2, _addr) {             \
 157         .type = IIO_VOLTAGE,                                    \
 158         .differential = 1,                                      \
 159         .indexed = 1,                                           \
 160         .address = _addr,                                       \
 161         .channel = _chan,                                       \
 162         .channel2 = _chan2,                                     \
 163         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 164                                 BIT(IIO_CHAN_INFO_SCALE) |      \
 165                                 BIT(IIO_CHAN_INFO_SAMP_FREQ),   \
 166         .scan_index = _addr,                                    \
 167         .scan_type = {                                          \
 168                 .sign = 's',                                    \
 169                 .realbits = 16,                                 \
 170                 .storagebits = 16,                              \
 171                 .endianness = IIO_CPU,                          \
 172         },                                                      \
 173         .datasheet_name = "AIN"#_chan"-AIN"#_chan2,             \
 174 }
 175
 176 struct ads1015_data {
 177         struct regmap *regmap;
 178         /*
 179          * Protects ADC ops, e.g: concurrent sysfs/buffered
 180          * data reads, configuration updates
 181          */
 182         struct mutex lock;
 183         struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
 184
 185         unsigned int *data_rate;
 186 };
 187
 188 static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg)
 189 {
 190         return (reg == ADS1015_CFG_REG);
 191 }
 192
 193 static const struct regmap_config ads1015_regmap_config = {
 194         .reg_bits = 8,
 195         .val_bits = 16,
 196         .max_register = ADS1015_CFG_REG,
 197         .writeable_reg = ads1015_is_writeable_reg,
 198 };
 199
 200 static const struct iio_chan_spec ads1015_channels[] = {
 201         ADS1015_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
 202         ADS1015_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
 203         ADS1015_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
 204         ADS1015_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
 205         ADS1015_V_CHAN(0, ADS1015_AIN0),
 206         ADS1015_V_CHAN(1, ADS1015_AIN1),
 207         ADS1015_V_CHAN(2, ADS1015_AIN2),
 208         ADS1015_V_CHAN(3, ADS1015_AIN3),
 209         IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
 210 };
 211
 212 static const struct iio_chan_spec ads1115_channels[] = {
 213         ADS1115_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
 214         ADS1115_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
 215         ADS1115_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
 216         ADS1115_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
 217         ADS1115_V_CHAN(0, ADS1015_AIN0),
 218         ADS1115_V_CHAN(1, ADS1015_AIN1),
 219         ADS1115_V_CHAN(2, ADS1015_AIN2),
 220         ADS1115_V_CHAN(3, ADS1015_AIN3),
 221         IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
 222 };
 223
 224 static int ads1015_set_power_state(struct ads1015_data *data, bool on)
 225 {
 226         int ret;
 227         struct device *dev = regmap_get_device(data->regmap);
 228
 229         if (on) {
 230                 ret = pm_runtime_get_sync(dev);
 231                 if (ret < 0)
 232                         pm_runtime_put_noidle(dev);
 233         } else {
 234                 pm_runtime_mark_last_busy(dev);
 235                 ret = pm_runtime_put_autosuspend(dev);
 236         }
 237
 238         return ret;
 239 }
 240
 241 static
 242 int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
 243 {
 244         int ret, pga, dr, conv_time;
 245         bool change;
 246
 247         if (chan < 0 || chan >= ADS1015_CHANNELS)
 248                 return -EINVAL;
 249
 250         pga = data->channel_data[chan].pga;
 251         dr = data->channel_data[chan].data_rate;
 252
 253         ret = regmap_update_bits_check(data->regmap, ADS1015_CFG_REG,
 254                                        ADS1015_CFG_MUX_MASK |
 255                                        ADS1015_CFG_PGA_MASK,
 256                                        chan << ADS1015_CFG_MUX_SHIFT |
 257                                        pga << ADS1015_CFG_PGA_SHIFT,
 258                                        &change);
 259         if (ret < 0)
 260                 return ret;
 261
 262         if (change) {
 263                 conv_time = DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr]);
 264                 usleep_range(conv_time, conv_time + 1);
 265         }
 266
 267         return regmap_read(data->regmap, ADS1015_CONV_REG, val);
 268 }
 269
 270 static irqreturn_t ads1015_trigger_handler(int irq, void *p)
 271 {
 272         struct iio_poll_func *pf = p;
 273         struct iio_dev *indio_dev = pf->indio_dev;
 274         struct ads1015_data *data = iio_priv(indio_dev);
 275         s16 buf[8]; /* 1x s16 ADC val + 3x s16 padding +  4x s16 timestamp */
 276         int chan, ret, res;
 277
 278         memset(buf, 0, sizeof(buf));
 279
 280         mutex_lock(&data->lock);
 281         chan = find_first_bit(indio_dev->active_scan_mask,
 282                               indio_dev->masklength);
 283         ret = ads1015_get_adc_result(data, chan, &res);
 284         if (ret < 0) {
 285                 mutex_unlock(&data->lock);
 286                 goto err;
 287         }
 288
 289         buf[0] = res;
 290         mutex_unlock(&data->lock);
 291
 292         iio_push_to_buffers_with_timestamp(indio_dev, buf,
 293                                            iio_get_time_ns(indio_dev));
 294
 295 err:
 296         iio_trigger_notify_done(indio_dev->trig);
 297
 298         return IRQ_HANDLED;
 299 }
 300
 301 static int ads1015_set_scale(struct ads1015_data *data, int chan,
 302                              int scale, int uscale)
 303 {
 304         int i, ret, rindex = -1;
 305
 306         for (i = 0; i < ARRAY_SIZE(ads1015_scale); i++)
 307                 if (ads1015_scale[i].scale == scale &&
 308                     ads1015_scale[i].uscale == uscale) {
 309                         rindex = i;
 310                         break;
 311                 }
 312         if (rindex < 0)
 313                 return -EINVAL;
 314
 315         ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
 316                                  ADS1015_CFG_PGA_MASK,
 317                                  rindex << ADS1015_CFG_PGA_SHIFT);
 318         if (ret < 0)
 319                 return ret;
 320
 321         data->channel_data[chan].pga = rindex;
 322
 323         return 0;
 324 }
 325
 326 static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
 327 {
 328         int i, ret, rindex = -1;
 329
 330         for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++)
 331                 if (data->data_rate[i] == rate) {
 332                         rindex = i;
 333                         break;
 334                 }
 335         if (rindex < 0)
 336                 return -EINVAL;
 337
 338         ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
 339                                  ADS1015_CFG_DR_MASK,
 340                                  rindex << ADS1015_CFG_DR_SHIFT);
 341         if (ret < 0)
 342                 return ret;
 343
 344         data->channel_data[chan].data_rate = rindex;
 345
 346         return 0;
 347 }
 348
 349 static int ads1015_read_raw(struct iio_dev *indio_dev,
 350                             struct iio_chan_spec const *chan, int *val,
 351                             int *val2, long mask)
 352 {
 353         int ret, idx;
 354         struct ads1015_data *data = iio_priv(indio_dev);
 355
 356         mutex_lock(&indio_dev->mlock);
 357         mutex_lock(&data->lock);
 358         switch (mask) {
 359         case IIO_CHAN_INFO_RAW: {
 360                 int shift = chan->scan_type.shift;
 361
 362                 if (iio_buffer_enabled(indio_dev)) {
 363                         ret = -EBUSY;
 364                         break;
 365                 }
 366
 367                 ret = ads1015_set_power_state(data, true);
 368                 if (ret < 0)
 369                         break;
 370
 371                 ret = ads1015_get_adc_result(data, chan->address, val);
 372                 if (ret < 0) {
 373                         ads1015_set_power_state(data, false);
 374                         break;
 375                 }
 376
 377                 *val = sign_extend32(*val >> shift, 15 - shift);
 378
 379                 ret = ads1015_set_power_state(data, false);
 380                 if (ret < 0)
 381                         break;
 382
 383                 ret = IIO_VAL_INT;
 384                 break;
 385         }
 386         case IIO_CHAN_INFO_SCALE:
 387                 idx = data->channel_data[chan->address].pga;
 388                 *val = ads1015_scale[idx].scale;
 389                 *val2 = ads1015_scale[idx].uscale;
 390                 ret = IIO_VAL_INT_PLUS_MICRO;
 391                 break;
 392         case IIO_CHAN_INFO_SAMP_FREQ:
 393                 idx = data->channel_data[chan->address].data_rate;
 394                 *val = data->data_rate[idx];
 395                 ret = IIO_VAL_INT;
 396                 break;
 397         default:
 398                 ret = -EINVAL;
 399                 break;
 400         }
 401         mutex_unlock(&data->lock);
 402         mutex_unlock(&indio_dev->mlock);
 403
 404         return ret;
 405 }
 406
 407 static int ads1015_write_raw(struct iio_dev *indio_dev,
 408                              struct iio_chan_spec const *chan, int val,
 409                              int val2, long mask)
 410 {
 411         struct ads1015_data *data = iio_priv(indio_dev);
 412         int ret;
 413
 414         mutex_lock(&data->lock);
 415         switch (mask) {
 416         case IIO_CHAN_INFO_SCALE:
 417                 ret = ads1015_set_scale(data, chan->address, val, val2);
 418                 break;
 419         case IIO_CHAN_INFO_SAMP_FREQ:
 420                 ret = ads1015_set_data_rate(data, chan->address, val);
 421                 break;
 422         default:
 423                 ret = -EINVAL;
 424                 break;
 425         }
 426         mutex_unlock(&data->lock);
 427
 428         return ret;
 429 }
 430
 431 static int ads1015_buffer_preenable(struct iio_dev *indio_dev)
 432 {
 433         return ads1015_set_power_state(iio_priv(indio_dev), true);
 434 }
 435
 436 static int ads1015_buffer_postdisable(struct iio_dev *indio_dev)
 437 {
 438         return ads1015_set_power_state(iio_priv(indio_dev), false);
 439 }
 440
 441 static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = {
 442         .preenable      = ads1015_buffer_preenable,
 443         .postenable     = iio_triggered_buffer_postenable,
 444         .predisable     = iio_triggered_buffer_predisable,
 445         .postdisable    = ads1015_buffer_postdisable,
 446         .validate_scan_mask = &iio_validate_scan_mask_onehot,
 447 };
 448
 449 static IIO_CONST_ATTR(scale_available, "3 2 1 0.5 0.25 0.125");
 450
 451 static IIO_CONST_ATTR_NAMED(ads1015_sampling_frequency_available,
 452         sampling_frequency_available, "128 250 490 920 1600 2400 3300");
 453 static IIO_CONST_ATTR_NAMED(ads1115_sampling_frequency_available,
 454         sampling_frequency_available, "8 16 32 64 128 250 475 860");
 455
 456 static struct attribute *ads1015_attributes[] = {
 457         &iio_const_attr_scale_available.dev_attr.attr,
 458         &iio_const_attr_ads1015_sampling_frequency_available.dev_attr.attr,
 459         NULL,
 460 };
 461
 462 static const struct attribute_group ads1015_attribute_group = {
 463         .attrs = ads1015_attributes,
 464 };
 465
 466 static struct attribute *ads1115_attributes[] = {
 467         &iio_const_attr_scale_available.dev_attr.attr,
 468         &iio_const_attr_ads1115_sampling_frequency_available.dev_attr.attr,
 469         NULL,
 470 };
 471
 472 static const struct attribute_group ads1115_attribute_group = {
 473         .attrs = ads1115_attributes,
 474 };
 475
 476 static const struct iio_info ads1015_info = {
 477         .driver_module  = THIS_MODULE,
 478         .read_raw       = ads1015_read_raw,
 479         .write_raw      = ads1015_write_raw,
 480         .attrs          = &ads1015_attribute_group,
 481 };
 482
 483 static const struct iio_info ads1115_info = {
 484         .driver_module  = THIS_MODULE,
 485         .read_raw       = ads1015_read_raw,
 486         .write_raw      = ads1015_write_raw,
 487         .attrs          = &ads1115_attribute_group,
 488 };
 489
 490 #ifdef CONFIG_OF
 491 static int ads1015_get_channels_config_of(struct i2c_client *client)
 492 {
 493         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 494         struct ads1015_data *data = iio_priv(indio_dev);
 495         struct device_node *node;
 496
 497         if (!client->dev.of_node ||
 498             !of_get_next_child(client->dev.of_node, NULL))
 499                 return -EINVAL;
 500
 501         for_each_child_of_node(client->dev.of_node, node) {
 502                 u32 pval;
 503                 unsigned int channel;
 504                 unsigned int pga = ADS1015_DEFAULT_PGA;
 505                 unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE;
 506
 507                 if (of_property_read_u32(node, "reg", &pval)) {
 508                         dev_err(&client->dev, "invalid reg on %s\n",
 509                                 node->full_name);
 510                         continue;
 511                 }
 512
 513                 channel = pval;
 514                 if (channel >= ADS1015_CHANNELS) {
 515                         dev_err(&client->dev,
 516                                 "invalid channel index %d on %s\n",
 517                                 channel, node->full_name);
 518                         continue;
 519                 }
 520
 521                 if (!of_property_read_u32(node, "ti,gain", &pval)) {
 522                         pga = pval;
 523                         if (pga > 6) {
 524                                 dev_err(&client->dev, "invalid gain on %s\n",
 525                                         node->full_name);
 526                                 of_node_put(node);
 527                                 return -EINVAL;
 528                         }
 529                 }
 530
 531                 if (!of_property_read_u32(node, "ti,datarate", &pval)) {
 532                         data_rate = pval;
 533                         if (data_rate > 7) {
 534                                 dev_err(&client->dev,
 535                                         "invalid data_rate on %s\n",
 536                                         node->full_name);
 537                                 of_node_put(node);
 538                                 return -EINVAL;
 539                         }
 540                 }
 541
 542                 data->channel_data[channel].pga = pga;
 543                 data->channel_data[channel].data_rate = data_rate;
 544         }
 545
 546         return 0;
 547 }
 548 #endif
 549
 550 static void ads1015_get_channels_config(struct i2c_client *client)
 551 {
 552         unsigned int k;
 553
 554         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 555         struct ads1015_data *data = iio_priv(indio_dev);
 556         struct ads1015_platform_data *pdata = dev_get_platdata(&client->dev);
 557
 558         /* prefer platform data */
 559         if (pdata) {
 560                 memcpy(data->channel_data, pdata->channel_data,
 561                        sizeof(data->channel_data));
 562                 return;
 563         }
 564
 565 #ifdef CONFIG_OF
 566         if (!ads1015_get_channels_config_of(client))
 567                 return;
 568 #endif
 569         /* fallback on default configuration */
 570         for (k = 0; k < ADS1015_CHANNELS; ++k) {
 571                 data->channel_data[k].pga = ADS1015_DEFAULT_PGA;
 572                 data->channel_data[k].data_rate = ADS1015_DEFAULT_DATA_RATE;
 573         }
 574 }
 575
 576 static int ads1015_probe(struct i2c_client *client,
 577                          const struct i2c_device_id *id)
 578 {
 579         struct iio_dev *indio_dev;
 580         struct ads1015_data *data;
 581         int ret;
 582         enum chip_ids chip;
 583
 584         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 585         if (!indio_dev)
 586                 return -ENOMEM;
 587
 588         data = iio_priv(indio_dev);
 589         i2c_set_clientdata(client, indio_dev);
 590
 591         mutex_init(&data->lock);
 592
 593         indio_dev->dev.parent = &client->dev;
 594         indio_dev->dev.of_node = client->dev.of_node;
 595         indio_dev->name = ADS1015_DRV_NAME;
 596         indio_dev->modes = INDIO_DIRECT_MODE;
 597
 598         if (client->dev.of_node)
 599                 chip = (enum chip_ids)of_device_get_match_data(&client->dev);
 600         else
 601                 chip = id->driver_data;
 602         switch (chip) {
 603         case ADS1015:
 604                 indio_dev->channels = ads1015_channels;
 605                 indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
 606                 indio_dev->info = &ads1015_info;
 607                 data->data_rate = (unsigned int *) &ads1015_data_rate;
 608                 break;
 609         case ADS1115:
 610                 indio_dev->channels = ads1115_channels;
 611                 indio_dev->num_channels = ARRAY_SIZE(ads1115_channels);
 612                 indio_dev->info = &ads1115_info;
 613                 data->data_rate = (unsigned int *) &ads1115_data_rate;
 614                 break;
 615         }
 616
 617         /* we need to keep this ABI the same as used by hwmon ADS1015 driver */
 618         ads1015_get_channels_config(client);
 619
 620         data->regmap = devm_regmap_init_i2c(client, &ads1015_regmap_config);
 621         if (IS_ERR(data->regmap)) {
 622                 dev_err(&client->dev, "Failed to allocate register map\n");
 623                 return PTR_ERR(data->regmap);
 624         }
 625
 626         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 627                                          ads1015_trigger_handler,
 628                                          &ads1015_buffer_setup_ops);
 629         if (ret < 0) {
 630                 dev_err(&client->dev, "iio triggered buffer setup failed\n");
 631                 return ret;
 632         }
 633         ret = pm_runtime_set_active(&client->dev);
 634         if (ret)
 635                 goto err_buffer_cleanup;
 636         pm_runtime_set_autosuspend_delay(&client->dev, ADS1015_SLEEP_DELAY_MS);
 637         pm_runtime_use_autosuspend(&client->dev);
 638         pm_runtime_enable(&client->dev);
 639
 640         ret = iio_device_register(indio_dev);
 641         if (ret < 0) {
 642                 dev_err(&client->dev, "Failed to register IIO device\n");
 643                 goto err_buffer_cleanup;
 644         }
 645
 646         return 0;
 647
 648 err_buffer_cleanup:
 649         iio_triggered_buffer_cleanup(indio_dev);
 650
 651         return ret;
 652 }
 653
 654 static int ads1015_remove(struct i2c_client *client)
 655 {
 656         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 657         struct ads1015_data *data = iio_priv(indio_dev);
 658
 659         iio_device_unregister(indio_dev);
 660
 661         pm_runtime_disable(&client->dev);
 662         pm_runtime_set_suspended(&client->dev);
 663         pm_runtime_put_noidle(&client->dev);
 664
 665         iio_triggered_buffer_cleanup(indio_dev);
 666
 667         /* power down single shot mode */
 668         return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
 669                                   ADS1015_CFG_MOD_MASK,
 670                                   ADS1015_SINGLESHOT << ADS1015_CFG_MOD_SHIFT);
 671 }
 672
 673 #ifdef CONFIG_PM
 674 static int ads1015_runtime_suspend(struct device *dev)
 675 {
 676         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 677         struct ads1015_data *data = iio_priv(indio_dev);
 678
 679         return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
 680                                   ADS1015_CFG_MOD_MASK,
 681                                   ADS1015_SINGLESHOT << ADS1015_CFG_MOD_SHIFT);
 682 }
 683
 684 static int ads1015_runtime_resume(struct device *dev)
 685 {
 686         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 687         struct ads1015_data *data = iio_priv(indio_dev);
 688
 689         return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
 690                                   ADS1015_CFG_MOD_MASK,
 691                                   ADS1015_CONTINUOUS << ADS1015_CFG_MOD_SHIFT);
 692 }
 693 #endif
 694
 695 static const struct dev_pm_ops ads1015_pm_ops = {
 696         SET_RUNTIME_PM_OPS(ads1015_runtime_suspend,
 697                            ads1015_runtime_resume, NULL)
 698 };
 699
 700 static const struct i2c_device_id ads1015_id[] = {
 701         {"ads1015", ADS1015},
 702         {"ads1115", ADS1115},
 703         {}
 704 };
 705 MODULE_DEVICE_TABLE(i2c, ads1015_id);
 706
 707 static const struct of_device_id ads1015_of_match[] = {
 708         {
 709                 .compatible = "ti,ads1015",
 710                 .data = (void *)ADS1015
 711         },
 712         {
 713                 .compatible = "ti,ads1115",
 714                 .data = (void *)ADS1115
 715         },
 716         {}
 717 };
 718 MODULE_DEVICE_TABLE(of, ads1015_of_match);
 719
 720 static struct i2c_driver ads1015_driver = {
 721         .driver = {
 722                 .name = ADS1015_DRV_NAME,
 723                 .of_match_table = ads1015_of_match,
 724                 .pm = &ads1015_pm_ops,
 725         },
 726         .probe          = ads1015_probe,
 727         .remove         = ads1015_remove,
 728         .id_table       = ads1015_id,
 729 };
 730
 731 module_i2c_driver(ads1015_driver);
 732
 733 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
 734 MODULE_DESCRIPTION("Texas Instruments ADS1015 ADC driver");
 735 MODULE_LICENSE("GPL v2");