drivers/iio/adc/ad7606.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AD7606 SPI ADC driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  */
   7
   8 #include <linux/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/sysfs.h>
  19 #include <linux/util_macros.h>
  20
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/buffer.h>
  23 #include <linux/iio/sysfs.h>
  24 #include <linux/iio/trigger.h>
  25 #include <linux/iio/triggered_buffer.h>
  26 #include <linux/iio/trigger_consumer.h>
  27
  28 #include "ad7606.h"
  29
  30 /*
  31  * Scales are computed as 5000/32768 and 10000/32768 respectively,
  32  * so that when applied to the raw values they provide mV values
  33  */
  34 static const unsigned int ad7606_scale_avail[2] = {
  35         152588, 305176
  36 };
  37
  38
  39 static const unsigned int ad7616_sw_scale_avail[3] = {
  40         76293, 152588, 305176
  41 };
  42
  43 static const unsigned int ad7606_oversampling_avail[7] = {
  44         1, 2, 4, 8, 16, 32, 64,
  45 };
  46
  47 static const unsigned int ad7616_oversampling_avail[8] = {
  48         1, 2, 4, 8, 16, 32, 64, 128,
  49 };
  50
  51 static int ad7606_reset(struct ad7606_state *st)
  52 {
  53         if (st->gpio_reset) {
  54                 gpiod_set_value(st->gpio_reset, 1);
  55                 ndelay(100); /* t_reset >= 100ns */
  56                 gpiod_set_value(st->gpio_reset, 0);
  57                 return 0;
  58         }
  59
  60         return -ENODEV;
  61 }
  62
  63 static int ad7606_reg_access(struct iio_dev *indio_dev,
  64                              unsigned int reg,
  65                              unsigned int writeval,
  66                              unsigned int *readval)
  67 {
  68         struct ad7606_state *st = iio_priv(indio_dev);
  69         int ret;
  70
  71         mutex_lock(&st->lock);
  72         if (readval) {
  73                 ret = st->bops->reg_read(st, reg);
  74                 if (ret < 0)
  75                         goto err_unlock;
  76                 *readval = ret;
  77                 ret = 0;
  78         } else {
  79                 ret = st->bops->reg_write(st, reg, writeval);
  80         }
  81 err_unlock:
  82         mutex_unlock(&st->lock);
  83         return ret;
  84 }
  85
  86 static int ad7606_read_samples(struct ad7606_state *st)
  87 {
  88         unsigned int num = st->chip_info->num_channels - 1;
  89         u16 *data = st->data;
  90         int ret;
  91
  92         /*
  93          * The frstdata signal is set to high while and after reading the sample
  94          * of the first channel and low for all other channels. This can be used
  95          * to check that the incoming data is correctly aligned. During normal
  96          * operation the data should never become unaligned, but some glitch or
  97          * electrostatic discharge might cause an extra read or clock cycle.
  98          * Monitoring the frstdata signal allows to recover from such failure
  99          * situations.
 100          */
 101
 102         if (st->gpio_frstdata) {
 103                 ret = st->bops->read_block(st->dev, 1, data);
 104                 if (ret)
 105                         return ret;
 106
 107                 if (!gpiod_get_value(st->gpio_frstdata)) {
 108                         ad7606_reset(st);
 109                         return -EIO;
 110                 }
 111
 112                 data++;
 113                 num--;
 114         }
 115
 116         return st->bops->read_block(st->dev, num, data);
 117 }
 118
 119 static irqreturn_t ad7606_trigger_handler(int irq, void *p)
 120 {
 121         struct iio_poll_func *pf = p;
 122         struct iio_dev *indio_dev = pf->indio_dev;
 123         struct ad7606_state *st = iio_priv(indio_dev);
 124         int ret;
 125
 126         mutex_lock(&st->lock);
 127
 128         ret = ad7606_read_samples(st);
 129         if (ret == 0)
 130                 iio_push_to_buffers_with_timestamp(indio_dev, st->data,
 131                                                    iio_get_time_ns(indio_dev));
 132
 133         iio_trigger_notify_done(indio_dev->trig);
 134         /* The rising edge of the CONVST signal starts a new conversion. */
 135         gpiod_set_value(st->gpio_convst, 1);
 136
 137         mutex_unlock(&st->lock);
 138
 139         return IRQ_HANDLED;
 140 }
 141
 142 static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
 143 {
 144         struct ad7606_state *st = iio_priv(indio_dev);
 145         int ret;
 146
 147         gpiod_set_value(st->gpio_convst, 1);
 148         ret = wait_for_completion_timeout(&st->completion,
 149                                           msecs_to_jiffies(1000));
 150         if (!ret) {
 151                 ret = -ETIMEDOUT;
 152                 goto error_ret;
 153         }
 154
 155         ret = ad7606_read_samples(st);
 156         if (ret == 0)
 157                 ret = st->data[ch];
 158
 159 error_ret:
 160         gpiod_set_value(st->gpio_convst, 0);
 161
 162         return ret;
 163 }
 164
 165 static int ad7606_read_raw(struct iio_dev *indio_dev,
 166                            struct iio_chan_spec const *chan,
 167                            int *val,
 168                            int *val2,
 169                            long m)
 170 {
 171         int ret, ch = 0;
 172         struct ad7606_state *st = iio_priv(indio_dev);
 173
 174         switch (m) {
 175         case IIO_CHAN_INFO_RAW:
 176                 ret = iio_device_claim_direct_mode(indio_dev);
 177                 if (ret)
 178                         return ret;
 179
 180                 ret = ad7606_scan_direct(indio_dev, chan->address);
 181                 iio_device_release_direct_mode(indio_dev);
 182
 183                 if (ret < 0)
 184                         return ret;
 185                 *val = (short)ret;
 186                 return IIO_VAL_INT;
 187         case IIO_CHAN_INFO_SCALE:
 188                 if (st->sw_mode_en)
 189                         ch = chan->address;
 190                 *val = 0;
 191                 *val2 = st->scale_avail[st->range[ch]];
 192                 return IIO_VAL_INT_PLUS_MICRO;
 193         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 194                 *val = st->oversampling;
 195                 return IIO_VAL_INT;
 196         }
 197         return -EINVAL;
 198 }
 199
 200 static ssize_t ad7606_show_avail(char *buf, const unsigned int *vals,
 201                                  unsigned int n, bool micros)
 202 {
 203         size_t len = 0;
 204         int i;
 205
 206         for (i = 0; i < n; i++) {
 207                 len += scnprintf(buf + len, PAGE_SIZE - len,
 208                         micros ? "0.%06u " : "%u ", vals[i]);
 209         }
 210         buf[len - 1] = '\n';
 211
 212         return len;
 213 }
 214
 215 static ssize_t in_voltage_scale_available_show(struct device *dev,
 216                                                struct device_attribute *attr,
 217                                                char *buf)
 218 {
 219         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 220         struct ad7606_state *st = iio_priv(indio_dev);
 221
 222         return ad7606_show_avail(buf, st->scale_avail, st->num_scales, true);
 223 }
 224
 225 static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
 226
 227 static int ad7606_write_scale_hw(struct iio_dev *indio_dev, int ch, int val)
 228 {
 229         struct ad7606_state *st = iio_priv(indio_dev);
 230
 231         gpiod_set_value(st->gpio_range, val);
 232
 233         return 0;
 234 }
 235
 236 static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
 237 {
 238         struct ad7606_state *st = iio_priv(indio_dev);
 239         DECLARE_BITMAP(values, 3);
 240
 241         values[0] = val;
 242
 243         gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
 244                               st->gpio_os->info, values);
 245
 246         /* AD7616 requires a reset to update value */
 247         if (st->chip_info->os_req_reset)
 248                 ad7606_reset(st);
 249
 250         return 0;
 251 }
 252
 253 static int ad7606_write_raw(struct iio_dev *indio_dev,
 254                             struct iio_chan_spec const *chan,
 255                             int val,
 256                             int val2,
 257                             long mask)
 258 {
 259         struct ad7606_state *st = iio_priv(indio_dev);
 260         int i, ret, ch = 0;
 261
 262         switch (mask) {
 263         case IIO_CHAN_INFO_SCALE:
 264                 mutex_lock(&st->lock);
 265                 i = find_closest(val2, st->scale_avail, st->num_scales);
 266                 if (st->sw_mode_en)
 267                         ch = chan->address;
 268                 ret = st->write_scale(indio_dev, ch, i);
 269                 if (ret < 0) {
 270                         mutex_unlock(&st->lock);
 271                         return ret;
 272                 }
 273                 st->range[ch] = i;
 274                 mutex_unlock(&st->lock);
 275
 276                 return 0;
 277         case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
 278                 if (val2)
 279                         return -EINVAL;
 280                 i = find_closest(val, st->oversampling_avail,
 281                                  st->num_os_ratios);
 282                 mutex_lock(&st->lock);
 283                 ret = st->write_os(indio_dev, i);
 284                 if (ret < 0) {
 285                         mutex_unlock(&st->lock);
 286                         return ret;
 287                 }
 288                 st->oversampling = st->oversampling_avail[i];
 289                 mutex_unlock(&st->lock);
 290
 291                 return 0;
 292         default:
 293                 return -EINVAL;
 294         }
 295 }
 296
 297 static ssize_t ad7606_oversampling_ratio_avail(struct device *dev,
 298                                                struct device_attribute *attr,
 299                                                char *buf)
 300 {
 301         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 302         struct ad7606_state *st = iio_priv(indio_dev);
 303
 304         return ad7606_show_avail(buf, st->oversampling_avail,
 305                                  st->num_os_ratios, false);
 306 }
 307
 308 static IIO_DEVICE_ATTR(oversampling_ratio_available, 0444,
 309                        ad7606_oversampling_ratio_avail, NULL, 0);
 310
 311 static struct attribute *ad7606_attributes_os_and_range[] = {
 312         &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
 313         &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
 314         NULL,
 315 };
 316
 317 static const struct attribute_group ad7606_attribute_group_os_and_range = {
 318         .attrs = ad7606_attributes_os_and_range,
 319 };
 320
 321 static struct attribute *ad7606_attributes_os[] = {
 322         &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
 323         NULL,
 324 };
 325
 326 static const struct attribute_group ad7606_attribute_group_os = {
 327         .attrs = ad7606_attributes_os,
 328 };
 329
 330 static struct attribute *ad7606_attributes_range[] = {
 331         &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
 332         NULL,
 333 };
 334
 335 static const struct attribute_group ad7606_attribute_group_range = {
 336         .attrs = ad7606_attributes_range,
 337 };
 338
 339 static const struct iio_chan_spec ad7605_channels[] = {
 340         IIO_CHAN_SOFT_TIMESTAMP(4),
 341         AD7605_CHANNEL(0),
 342         AD7605_CHANNEL(1),
 343         AD7605_CHANNEL(2),
 344         AD7605_CHANNEL(3),
 345 };
 346
 347 static const struct iio_chan_spec ad7606_channels[] = {
 348         IIO_CHAN_SOFT_TIMESTAMP(8),
 349         AD7606_CHANNEL(0),
 350         AD7606_CHANNEL(1),
 351         AD7606_CHANNEL(2),
 352         AD7606_CHANNEL(3),
 353         AD7606_CHANNEL(4),
 354         AD7606_CHANNEL(5),
 355         AD7606_CHANNEL(6),
 356         AD7606_CHANNEL(7),
 357 };
 358
 359 /*
 360  * The current assumption that this driver makes for AD7616, is that it's
 361  * working in Hardware Mode with Serial, Burst and Sequencer modes activated.
 362  * To activate them, following pins must be pulled high:
 363  *      -SER/PAR
 364  *      -SEQEN
 365  * And following pins must be pulled low:
 366  *      -WR/BURST
 367  *      -DB4/SER1W
 368  */
 369 static const struct iio_chan_spec ad7616_channels[] = {
 370         IIO_CHAN_SOFT_TIMESTAMP(16),
 371         AD7606_CHANNEL(0),
 372         AD7606_CHANNEL(1),
 373         AD7606_CHANNEL(2),
 374         AD7606_CHANNEL(3),
 375         AD7606_CHANNEL(4),
 376         AD7606_CHANNEL(5),
 377         AD7606_CHANNEL(6),
 378         AD7606_CHANNEL(7),
 379         AD7606_CHANNEL(8),
 380         AD7606_CHANNEL(9),
 381         AD7606_CHANNEL(10),
 382         AD7606_CHANNEL(11),
 383         AD7606_CHANNEL(12),
 384         AD7606_CHANNEL(13),
 385         AD7606_CHANNEL(14),
 386         AD7606_CHANNEL(15),
 387 };
 388
 389 static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
 390         /* More devices added in future */
 391         [ID_AD7605_4] = {
 392                 .channels = ad7605_channels,
 393                 .num_channels = 5,
 394         },
 395         [ID_AD7606_8] = {
 396                 .channels = ad7606_channels,
 397                 .num_channels = 9,
 398                 .oversampling_avail = ad7606_oversampling_avail,
 399                 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
 400         },
 401         [ID_AD7606_6] = {
 402                 .channels = ad7606_channels,
 403                 .num_channels = 7,
 404                 .oversampling_avail = ad7606_oversampling_avail,
 405                 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
 406         },
 407         [ID_AD7606_4] = {
 408                 .channels = ad7606_channels,
 409                 .num_channels = 5,
 410                 .oversampling_avail = ad7606_oversampling_avail,
 411                 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
 412         },
 413         [ID_AD7606B] = {
 414                 .channels = ad7606_channels,
 415                 .num_channels = 9,
 416                 .oversampling_avail = ad7606_oversampling_avail,
 417                 .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
 418         },
 419         [ID_AD7616] = {
 420                 .channels = ad7616_channels,
 421                 .num_channels = 17,
 422                 .oversampling_avail = ad7616_oversampling_avail,
 423                 .oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
 424                 .os_req_reset = true,
 425                 .init_delay_ms = 15,
 426         },
 427 };
 428
 429 static int ad7606_request_gpios(struct ad7606_state *st)
 430 {
 431         struct device *dev = st->dev;
 432
 433         st->gpio_convst = devm_gpiod_get(dev, "adi,conversion-start",
 434                                          GPIOD_OUT_LOW);
 435         if (IS_ERR(st->gpio_convst))
 436                 return PTR_ERR(st->gpio_convst);
 437
 438         st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 439         if (IS_ERR(st->gpio_reset))
 440                 return PTR_ERR(st->gpio_reset);
 441
 442         st->gpio_range = devm_gpiod_get_optional(dev, "adi,range",
 443                                                  GPIOD_OUT_LOW);
 444         if (IS_ERR(st->gpio_range))
 445                 return PTR_ERR(st->gpio_range);
 446
 447         st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
 448                                                    GPIOD_OUT_HIGH);
 449         if (IS_ERR(st->gpio_standby))
 450                 return PTR_ERR(st->gpio_standby);
 451
 452         st->gpio_frstdata = devm_gpiod_get_optional(dev, "adi,first-data",
 453                                                     GPIOD_IN);
 454         if (IS_ERR(st->gpio_frstdata))
 455                 return PTR_ERR(st->gpio_frstdata);
 456
 457         if (!st->chip_info->oversampling_num)
 458                 return 0;
 459
 460         st->gpio_os = devm_gpiod_get_array_optional(dev,
 461                                                     "adi,oversampling-ratio",
 462                                                     GPIOD_OUT_LOW);
 463         return PTR_ERR_OR_ZERO(st->gpio_os);
 464 }
 465
 466 /*
 467  * The BUSY signal indicates when conversions are in progress, so when a rising
 468  * edge of CONVST is applied, BUSY goes logic high and transitions low at the
 469  * end of the entire conversion process. The falling edge of the BUSY signal
 470  * triggers this interrupt.
 471  */
 472 static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
 473 {
 474         struct iio_dev *indio_dev = dev_id;
 475         struct ad7606_state *st = iio_priv(indio_dev);
 476
 477         if (iio_buffer_enabled(indio_dev)) {
 478                 gpiod_set_value(st->gpio_convst, 0);
 479                 iio_trigger_poll_chained(st->trig);
 480         } else {
 481                 complete(&st->completion);
 482         }
 483
 484         return IRQ_HANDLED;
 485 };
 486
 487 static int ad7606_validate_trigger(struct iio_dev *indio_dev,
 488                                    struct iio_trigger *trig)
 489 {
 490         struct ad7606_state *st = iio_priv(indio_dev);
 491
 492         if (st->trig != trig)
 493                 return -EINVAL;
 494
 495         return 0;
 496 }
 497
 498 static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
 499 {
 500         struct ad7606_state *st = iio_priv(indio_dev);
 501
 502         gpiod_set_value(st->gpio_convst, 1);
 503
 504         return 0;
 505 }
 506
 507 static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
 508 {
 509         struct ad7606_state *st = iio_priv(indio_dev);
 510
 511         gpiod_set_value(st->gpio_convst, 0);
 512
 513         return 0;
 514 }
 515
 516 static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
 517         .postenable = &ad7606_buffer_postenable,
 518         .predisable = &ad7606_buffer_predisable,
 519 };
 520
 521 static const struct iio_info ad7606_info_no_os_or_range = {
 522         .read_raw = &ad7606_read_raw,
 523         .validate_trigger = &ad7606_validate_trigger,
 524 };
 525
 526 static const struct iio_info ad7606_info_os_and_range = {
 527         .read_raw = &ad7606_read_raw,
 528         .write_raw = &ad7606_write_raw,
 529         .attrs = &ad7606_attribute_group_os_and_range,
 530         .validate_trigger = &ad7606_validate_trigger,
 531 };
 532
 533 static const struct iio_info ad7606_info_os_range_and_debug = {
 534         .read_raw = &ad7606_read_raw,
 535         .write_raw = &ad7606_write_raw,
 536         .debugfs_reg_access = &ad7606_reg_access,
 537         .attrs = &ad7606_attribute_group_os_and_range,
 538         .validate_trigger = &ad7606_validate_trigger,
 539 };
 540
 541 static const struct iio_info ad7606_info_os = {
 542         .read_raw = &ad7606_read_raw,
 543         .write_raw = &ad7606_write_raw,
 544         .attrs = &ad7606_attribute_group_os,
 545         .validate_trigger = &ad7606_validate_trigger,
 546 };
 547
 548 static const struct iio_info ad7606_info_range = {
 549         .read_raw = &ad7606_read_raw,
 550         .write_raw = &ad7606_write_raw,
 551         .attrs = &ad7606_attribute_group_range,
 552         .validate_trigger = &ad7606_validate_trigger,
 553 };
 554
 555 static const struct iio_trigger_ops ad7606_trigger_ops = {
 556         .validate_device = iio_trigger_validate_own_device,
 557 };
 558
 559 static void ad7606_regulator_disable(void *data)
 560 {
 561         struct ad7606_state *st = data;
 562
 563         regulator_disable(st->reg);
 564 }
 565
 566 int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 567                  const char *name, unsigned int id,
 568                  const struct ad7606_bus_ops *bops)
 569 {
 570         struct ad7606_state *st;
 571         int ret;
 572         struct iio_dev *indio_dev;
 573
 574         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 575         if (!indio_dev)
 576                 return -ENOMEM;
 577
 578         st = iio_priv(indio_dev);
 579         dev_set_drvdata(dev, indio_dev);
 580
 581         st->dev = dev;
 582         mutex_init(&st->lock);
 583         st->bops = bops;
 584         st->base_address = base_address;
 585         /* tied to logic low, analog input range is +/- 5V */
 586         st->range[0] = 0;
 587         st->oversampling = 1;
 588         st->scale_avail = ad7606_scale_avail;
 589         st->num_scales = ARRAY_SIZE(ad7606_scale_avail);
 590
 591         st->reg = devm_regulator_get(dev, "avcc");
 592         if (IS_ERR(st->reg))
 593                 return PTR_ERR(st->reg);
 594
 595         ret = regulator_enable(st->reg);
 596         if (ret) {
 597                 dev_err(dev, "Failed to enable specified AVcc supply\n");
 598                 return ret;
 599         }
 600
 601         ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
 602         if (ret)
 603                 return ret;
 604
 605         st->chip_info = &ad7606_chip_info_tbl[id];
 606
 607         if (st->chip_info->oversampling_num) {
 608                 st->oversampling_avail = st->chip_info->oversampling_avail;
 609                 st->num_os_ratios = st->chip_info->oversampling_num;
 610         }
 611
 612         ret = ad7606_request_gpios(st);
 613         if (ret)
 614                 return ret;
 615
 616         if (st->gpio_os) {
 617                 if (st->gpio_range)
 618                         indio_dev->info = &ad7606_info_os_and_range;
 619                 else
 620                         indio_dev->info = &ad7606_info_os;
 621         } else {
 622                 if (st->gpio_range)
 623                         indio_dev->info = &ad7606_info_range;
 624                 else
 625                         indio_dev->info = &ad7606_info_no_os_or_range;
 626         }
 627         indio_dev->modes = INDIO_DIRECT_MODE;
 628         indio_dev->name = name;
 629         indio_dev->channels = st->chip_info->channels;
 630         indio_dev->num_channels = st->chip_info->num_channels;
 631
 632         init_completion(&st->completion);
 633
 634         ret = ad7606_reset(st);
 635         if (ret)
 636                 dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
 637
 638         /* AD7616 requires al least 15ms to reconfigure after a reset */
 639         if (st->chip_info->init_delay_ms) {
 640                 if (msleep_interruptible(st->chip_info->init_delay_ms))
 641                         return -ERESTARTSYS;
 642         }
 643
 644         st->write_scale = ad7606_write_scale_hw;
 645         st->write_os = ad7606_write_os_hw;
 646
 647         if (st->bops->sw_mode_config)
 648                 st->sw_mode_en = device_property_present(st->dev,
 649                                                          "adi,sw-mode");
 650
 651         if (st->sw_mode_en) {
 652                 /* Scale of 0.076293 is only available in sw mode */
 653                 st->scale_avail = ad7616_sw_scale_avail;
 654                 st->num_scales = ARRAY_SIZE(ad7616_sw_scale_avail);
 655
 656                 /* After reset, in software mode, ±10 V is set by default */
 657                 memset32(st->range, 2, ARRAY_SIZE(st->range));
 658                 indio_dev->info = &ad7606_info_os_range_and_debug;
 659
 660                 ret = st->bops->sw_mode_config(indio_dev);
 661                 if (ret < 0)
 662                         return ret;
 663         }
 664
 665         st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
 666                                           indio_dev->name, indio_dev->id);
 667         if (!st->trig)
 668                 return -ENOMEM;
 669
 670         st->trig->ops = &ad7606_trigger_ops;
 671         st->trig->dev.parent = dev;
 672         iio_trigger_set_drvdata(st->trig, indio_dev);
 673         ret = devm_iio_trigger_register(dev, st->trig);
 674         if (ret)
 675                 return ret;
 676
 677         indio_dev->trig = iio_trigger_get(st->trig);
 678
 679         ret = devm_request_threaded_irq(dev, irq,
 680                                         NULL,
 681                                         &ad7606_interrupt,
 682                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 683                                         name, indio_dev);
 684         if (ret)
 685                 return ret;
 686
 687         ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
 688                                               &iio_pollfunc_store_time,
 689                                               &ad7606_trigger_handler,
 690                                               &ad7606_buffer_ops);
 691         if (ret)
 692                 return ret;
 693
 694         return devm_iio_device_register(dev, indio_dev);
 695 }
 696 EXPORT_SYMBOL_GPL(ad7606_probe);
 697
 698 #ifdef CONFIG_PM_SLEEP
 699
 700 static int ad7606_suspend(struct device *dev)
 701 {
 702         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 703         struct ad7606_state *st = iio_priv(indio_dev);
 704
 705         if (st->gpio_standby) {
 706                 gpiod_set_value(st->gpio_range, 1);
 707                 gpiod_set_value(st->gpio_standby, 0);
 708         }
 709
 710         return 0;
 711 }
 712
 713 static int ad7606_resume(struct device *dev)
 714 {
 715         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 716         struct ad7606_state *st = iio_priv(indio_dev);
 717
 718         if (st->gpio_standby) {
 719                 gpiod_set_value(st->gpio_range, st->range[0]);
 720                 gpiod_set_value(st->gpio_standby, 1);
 721                 ad7606_reset(st);
 722         }
 723
 724         return 0;
 725 }
 726
 727 SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
 728 EXPORT_SYMBOL_GPL(ad7606_pm_ops);
 729
 730 #endif
 731
 732 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 733 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 734 MODULE_LICENSE("GPL v2");