root/drivers/iio/adc/ad7606.c

DEFINITIONS

1. ad7606_reset
2. ad7606_reg_access
3. ad7606_read_samples
4. ad7606_trigger_handler
5. ad7606_scan_direct
6. ad7606_read_raw
7. ad7606_show_avail
8. in_voltage_scale_available_show
9. ad7606_write_scale_hw
10. ad7606_write_os_hw
11. ad7606_write_raw
12. ad7606_oversampling_ratio_avail
13. ad7606_request_gpios
14. ad7606_interrupt
15. ad7606_validate_trigger
16. ad7606_buffer_postenable
17. ad7606_buffer_predisable
18. ad7606_regulator_disable
19. ad7606_probe
20. ad7606_suspend
21. ad7606_resume

   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         iio_triggered_buffer_postenable(indio_dev);
 503         gpiod_set_value(st->gpio_convst, 1);
 504 
 505         return 0;
 506 }
 507 
 508 static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
 509 {
 510         struct ad7606_state *st = iio_priv(indio_dev);
 511 
 512         gpiod_set_value(st->gpio_convst, 0);
 513 
 514         return iio_triggered_buffer_predisable(indio_dev);
 515 }
 516 
 517 static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
 518         .postenable = &ad7606_buffer_postenable,
 519         .predisable = &ad7606_buffer_predisable,
 520 };
 521 
 522 static const struct iio_info ad7606_info_no_os_or_range = {
 523         .read_raw = &ad7606_read_raw,
 524         .validate_trigger = &ad7606_validate_trigger,
 525 };
 526 
 527 static const struct iio_info ad7606_info_os_and_range = {
 528         .read_raw = &ad7606_read_raw,
 529         .write_raw = &ad7606_write_raw,
 530         .attrs = &ad7606_attribute_group_os_and_range,
 531         .validate_trigger = &ad7606_validate_trigger,
 532 };
 533 
 534 static const struct iio_info ad7606_info_os_range_and_debug = {
 535         .read_raw = &ad7606_read_raw,
 536         .write_raw = &ad7606_write_raw,
 537         .debugfs_reg_access = &ad7606_reg_access,
 538         .attrs = &ad7606_attribute_group_os_and_range,
 539         .validate_trigger = &ad7606_validate_trigger,
 540 };
 541 
 542 static const struct iio_info ad7606_info_os = {
 543         .read_raw = &ad7606_read_raw,
 544         .write_raw = &ad7606_write_raw,
 545         .attrs = &ad7606_attribute_group_os,
 546         .validate_trigger = &ad7606_validate_trigger,
 547 };
 548 
 549 static const struct iio_info ad7606_info_range = {
 550         .read_raw = &ad7606_read_raw,
 551         .write_raw = &ad7606_write_raw,
 552         .attrs = &ad7606_attribute_group_range,
 553         .validate_trigger = &ad7606_validate_trigger,
 554 };
 555 
 556 static const struct iio_trigger_ops ad7606_trigger_ops = {
 557         .validate_device = iio_trigger_validate_own_device,
 558 };
 559 
 560 static void ad7606_regulator_disable(void *data)
 561 {
 562         struct ad7606_state *st = data;
 563 
 564         regulator_disable(st->reg);
 565 }
 566 
 567 int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 568                  const char *name, unsigned int id,
 569                  const struct ad7606_bus_ops *bops)
 570 {
 571         struct ad7606_state *st;
 572         int ret;
 573         struct iio_dev *indio_dev;
 574 
 575         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 576         if (!indio_dev)
 577                 return -ENOMEM;
 578 
 579         st = iio_priv(indio_dev);
 580         dev_set_drvdata(dev, indio_dev);
 581 
 582         st->dev = dev;
 583         mutex_init(&st->lock);
 584         st->bops = bops;
 585         st->base_address = base_address;
 586         /* tied to logic low, analog input range is +/- 5V */
 587         st->range[0] = 0;
 588         st->oversampling = 1;
 589         st->scale_avail = ad7606_scale_avail;
 590         st->num_scales = ARRAY_SIZE(ad7606_scale_avail);
 591 
 592         st->reg = devm_regulator_get(dev, "avcc");
 593         if (IS_ERR(st->reg))
 594                 return PTR_ERR(st->reg);
 595 
 596         ret = regulator_enable(st->reg);
 597         if (ret) {
 598                 dev_err(dev, "Failed to enable specified AVcc supply\n");
 599                 return ret;
 600         }
 601 
 602         ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
 603         if (ret)
 604                 return ret;
 605 
 606         st->chip_info = &ad7606_chip_info_tbl[id];
 607 
 608         if (st->chip_info->oversampling_num) {
 609                 st->oversampling_avail = st->chip_info->oversampling_avail;
 610                 st->num_os_ratios = st->chip_info->oversampling_num;
 611         }
 612 
 613         ret = ad7606_request_gpios(st);
 614         if (ret)
 615                 return ret;
 616 
 617         indio_dev->dev.parent = dev;
 618         if (st->gpio_os) {
 619                 if (st->gpio_range)
 620                         indio_dev->info = &ad7606_info_os_and_range;
 621                 else
 622                         indio_dev->info = &ad7606_info_os;
 623         } else {
 624                 if (st->gpio_range)
 625                         indio_dev->info = &ad7606_info_range;
 626                 else
 627                         indio_dev->info = &ad7606_info_no_os_or_range;
 628         }
 629         indio_dev->modes = INDIO_DIRECT_MODE;
 630         indio_dev->name = name;
 631         indio_dev->channels = st->chip_info->channels;
 632         indio_dev->num_channels = st->chip_info->num_channels;
 633 
 634         init_completion(&st->completion);
 635 
 636         ret = ad7606_reset(st);
 637         if (ret)
 638                 dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
 639 
 640         /* AD7616 requires al least 15ms to reconfigure after a reset */
 641         if (st->chip_info->init_delay_ms) {
 642                 if (msleep_interruptible(st->chip_info->init_delay_ms))
 643                         return -ERESTARTSYS;
 644         }
 645 
 646         st->write_scale = ad7606_write_scale_hw;
 647         st->write_os = ad7606_write_os_hw;
 648 
 649         if (st->bops->sw_mode_config)
 650                 st->sw_mode_en = device_property_present(st->dev,
 651                                                          "adi,sw-mode");
 652 
 653         if (st->sw_mode_en) {
 654                 /* Scale of 0.076293 is only available in sw mode */
 655                 st->scale_avail = ad7616_sw_scale_avail;
 656                 st->num_scales = ARRAY_SIZE(ad7616_sw_scale_avail);
 657 
 658                 /* After reset, in software mode, ±10 V is set by default */
 659                 memset32(st->range, 2, ARRAY_SIZE(st->range));
 660                 indio_dev->info = &ad7606_info_os_range_and_debug;
 661 
 662                 ret = st->bops->sw_mode_config(indio_dev);
 663                 if (ret < 0)
 664                         return ret;
 665         }
 666 
 667         st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
 668                                           indio_dev->name, indio_dev->id);
 669         if (!st->trig)
 670                 return -ENOMEM;
 671 
 672         st->trig->ops = &ad7606_trigger_ops;
 673         st->trig->dev.parent = dev;
 674         iio_trigger_set_drvdata(st->trig, indio_dev);
 675         ret = devm_iio_trigger_register(dev, st->trig);
 676         if (ret)
 677                 return ret;
 678 
 679         indio_dev->trig = iio_trigger_get(st->trig);
 680 
 681         ret = devm_request_threaded_irq(dev, irq,
 682                                         NULL,
 683                                         &ad7606_interrupt,
 684                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 685                                         name, indio_dev);
 686         if (ret)
 687                 return ret;
 688 
 689         ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
 690                                               &iio_pollfunc_store_time,
 691                                               &ad7606_trigger_handler,
 692                                               &ad7606_buffer_ops);
 693         if (ret)
 694                 return ret;
 695 
 696         return devm_iio_device_register(dev, indio_dev);
 697 }
 698 EXPORT_SYMBOL_GPL(ad7606_probe);
 699 
 700 #ifdef CONFIG_PM_SLEEP
 701 
 702 static int ad7606_suspend(struct device *dev)
 703 {
 704         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 705         struct ad7606_state *st = iio_priv(indio_dev);
 706 
 707         if (st->gpio_standby) {
 708                 gpiod_set_value(st->gpio_range, 1);
 709                 gpiod_set_value(st->gpio_standby, 0);
 710         }
 711 
 712         return 0;
 713 }
 714 
 715 static int ad7606_resume(struct device *dev)
 716 {
 717         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 718         struct ad7606_state *st = iio_priv(indio_dev);
 719 
 720         if (st->gpio_standby) {
 721                 gpiod_set_value(st->gpio_range, st->range[0]);
 722                 gpiod_set_value(st->gpio_standby, 1);
 723                 ad7606_reset(st);
 724         }
 725 
 726         return 0;
 727 }
 728 
 729 SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
 730 EXPORT_SYMBOL_GPL(ad7606_pm_ops);
 731 
 732 #endif
 733 
 734 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 735 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 736 MODULE_LICENSE("GPL v2");