drivers/iio/adc/ad799x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * iio/adc/ad799x.c
   4  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   5  *
   6  * based on iio/adc/max1363
   7  * Copyright (C) 2008-2010 Jonathan Cameron
   8  *
   9  * based on linux/drivers/i2c/chips/max123x
  10  * Copyright (C) 2002-2004 Stefan Eletzhofer
  11  *
  12  * based on linux/drivers/acron/char/pcf8583.c
  13  * Copyright (C) 2000 Russell King
  14  *
  15  * ad799x.c
  16  *
  17  * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
  18  * ad7998 and similar chips.
  19  */
  20
  21 #include <linux/interrupt.h>
  22 #include <linux/device.h>
  23 #include <linux/kernel.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/i2c.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/slab.h>
  28 #include <linux/types.h>
  29 #include <linux/err.h>
  30 #include <linux/module.h>
  31 #include <linux/bitops.h>
  32
  33 #include <linux/iio/iio.h>
  34 #include <linux/iio/sysfs.h>
  35 #include <linux/iio/events.h>
  36 #include <linux/iio/buffer.h>
  37 #include <linux/iio/trigger_consumer.h>
  38 #include <linux/iio/triggered_buffer.h>
  39
  40 #define AD799X_CHANNEL_SHIFT                    4
  41
  42 /*
  43  * AD7991, AD7995 and AD7999 defines
  44  */
  45
  46 #define AD7991_REF_SEL                          0x08
  47 #define AD7991_FLTR                             0x04
  48 #define AD7991_BIT_TRIAL_DELAY                  0x02
  49 #define AD7991_SAMPLE_DELAY                     0x01
  50
  51 /*
  52  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  53  */
  54
  55 #define AD7998_FLTR                             BIT(3)
  56 #define AD7998_ALERT_EN                         BIT(2)
  57 #define AD7998_BUSY_ALERT                       BIT(1)
  58 #define AD7998_BUSY_ALERT_POL                   BIT(0)
  59
  60 #define AD7998_CONV_RES_REG                     0x0
  61 #define AD7998_ALERT_STAT_REG                   0x1
  62 #define AD7998_CONF_REG                         0x2
  63 #define AD7998_CYCLE_TMR_REG                    0x3
  64
  65 #define AD7998_DATALOW_REG(x)                   ((x) * 3 + 0x4)
  66 #define AD7998_DATAHIGH_REG(x)                  ((x) * 3 + 0x5)
  67 #define AD7998_HYST_REG(x)                      ((x) * 3 + 0x6)
  68
  69 #define AD7998_CYC_MASK                         GENMASK(2, 0)
  70 #define AD7998_CYC_DIS                          0x0
  71 #define AD7998_CYC_TCONF_32                     0x1
  72 #define AD7998_CYC_TCONF_64                     0x2
  73 #define AD7998_CYC_TCONF_128                    0x3
  74 #define AD7998_CYC_TCONF_256                    0x4
  75 #define AD7998_CYC_TCONF_512                    0x5
  76 #define AD7998_CYC_TCONF_1024                   0x6
  77 #define AD7998_CYC_TCONF_2048                   0x7
  78
  79 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  80
  81 /*
  82  * AD7997 and AD7997 defines
  83  */
  84
  85 #define AD7997_8_READ_SINGLE                    BIT(7)
  86 #define AD7997_8_READ_SEQUENCE                  (BIT(6) | BIT(5) | BIT(4))
  87
  88 enum {
  89         ad7991,
  90         ad7995,
  91         ad7999,
  92         ad7992,
  93         ad7993,
  94         ad7994,
  95         ad7997,
  96         ad7998
  97 };
  98
  99 /**
 100  * struct ad799x_chip_config - chip specific information
 101  * @channel:            channel specification
 102  * @default_config:     device default configuration
 103  * @info:               pointer to iio_info struct
 104  */
 105 struct ad799x_chip_config {
 106         const struct iio_chan_spec      channel[9];
 107         u16                             default_config;
 108         const struct iio_info           *info;
 109 };
 110
 111 /**
 112  * struct ad799x_chip_info - chip specific information
 113  * @num_channels:       number of channels
 114  * @noirq_config:       device configuration w/o IRQ
 115  * @irq_config:         device configuration w/IRQ
 116  */
 117 struct ad799x_chip_info {
 118         int                             num_channels;
 119         const struct ad799x_chip_config noirq_config;
 120         const struct ad799x_chip_config irq_config;
 121 };
 122
 123 struct ad799x_state {
 124         struct i2c_client               *client;
 125         const struct ad799x_chip_config *chip_config;
 126         struct regulator                *reg;
 127         struct regulator                *vref;
 128         unsigned                        id;
 129         u16                             config;
 130
 131         u8                              *rx_buf;
 132         unsigned int                    transfer_size;
 133 };
 134
 135 static int ad799x_write_config(struct ad799x_state *st, u16 val)
 136 {
 137         switch (st->id) {
 138         case ad7997:
 139         case ad7998:
 140                 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
 141                         val);
 142         case ad7992:
 143         case ad7993:
 144         case ad7994:
 145                 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
 146                         val);
 147         default:
 148                 /* Will be written when doing a conversion */
 149                 st->config = val;
 150                 return 0;
 151         }
 152 }
 153
 154 static int ad799x_read_config(struct ad799x_state *st)
 155 {
 156         switch (st->id) {
 157         case ad7997:
 158         case ad7998:
 159                 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
 160         case ad7992:
 161         case ad7993:
 162         case ad7994:
 163                 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
 164         default:
 165                 /* No readback support */
 166                 return st->config;
 167         }
 168 }
 169
 170 static int ad799x_update_config(struct ad799x_state *st, u16 config)
 171 {
 172         int ret;
 173
 174         ret = ad799x_write_config(st, config);
 175         if (ret < 0)
 176                 return ret;
 177         ret = ad799x_read_config(st);
 178         if (ret < 0)
 179                 return ret;
 180         st->config = ret;
 181
 182         return 0;
 183 }
 184
 185 /*
 186  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 187  *
 188  * Currently there is no option in this driver to disable the saving of
 189  * timestamps within the ring.
 190  **/
 191 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 192 {
 193         struct iio_poll_func *pf = p;
 194         struct iio_dev *indio_dev = pf->indio_dev;
 195         struct ad799x_state *st = iio_priv(indio_dev);
 196         int b_sent;
 197         u8 cmd;
 198
 199         switch (st->id) {
 200         case ad7991:
 201         case ad7995:
 202         case ad7999:
 203                 cmd = st->config |
 204                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 205                 break;
 206         case ad7992:
 207         case ad7993:
 208         case ad7994:
 209                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 210                         AD7998_CONV_RES_REG;
 211                 break;
 212         case ad7997:
 213         case ad7998:
 214                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 215                 break;
 216         default:
 217                 cmd = 0;
 218         }
 219
 220         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 221                         cmd, st->transfer_size, st->rx_buf);
 222         if (b_sent < 0)
 223                 goto out;
 224
 225         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 226                         iio_get_time_ns(indio_dev));
 227 out:
 228         iio_trigger_notify_done(indio_dev->trig);
 229
 230         return IRQ_HANDLED;
 231 }
 232
 233 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 234         const unsigned long *scan_mask)
 235 {
 236         struct ad799x_state *st = iio_priv(indio_dev);
 237
 238         kfree(st->rx_buf);
 239         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 240         if (!st->rx_buf)
 241                 return -ENOMEM;
 242
 243         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 244
 245         switch (st->id) {
 246         case ad7992:
 247         case ad7993:
 248         case ad7994:
 249         case ad7997:
 250         case ad7998:
 251                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 252                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 253                 return ad799x_write_config(st, st->config);
 254         default:
 255                 return 0;
 256         }
 257 }
 258
 259 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 260 {
 261         u8 cmd;
 262
 263         switch (st->id) {
 264         case ad7991:
 265         case ad7995:
 266         case ad7999:
 267                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 268                 break;
 269         case ad7992:
 270         case ad7993:
 271         case ad7994:
 272                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 273                 break;
 274         case ad7997:
 275         case ad7998:
 276                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 277                 break;
 278         default:
 279                 return -EINVAL;
 280         }
 281
 282         return i2c_smbus_read_word_swapped(st->client, cmd);
 283 }
 284
 285 static int ad799x_read_raw(struct iio_dev *indio_dev,
 286                            struct iio_chan_spec const *chan,
 287                            int *val,
 288                            int *val2,
 289                            long m)
 290 {
 291         int ret;
 292         struct ad799x_state *st = iio_priv(indio_dev);
 293
 294         switch (m) {
 295         case IIO_CHAN_INFO_RAW:
 296                 ret = iio_device_claim_direct_mode(indio_dev);
 297                 if (ret)
 298                         return ret;
 299                 ret = ad799x_scan_direct(st, chan->scan_index);
 300                 iio_device_release_direct_mode(indio_dev);
 301
 302                 if (ret < 0)
 303                         return ret;
 304                 *val = (ret >> chan->scan_type.shift) &
 305                         GENMASK(chan->scan_type.realbits - 1, 0);
 306                 return IIO_VAL_INT;
 307         case IIO_CHAN_INFO_SCALE:
 308                 ret = regulator_get_voltage(st->vref);
 309                 if (ret < 0)
 310                         return ret;
 311                 *val = ret / 1000;
 312                 *val2 = chan->scan_type.realbits;
 313                 return IIO_VAL_FRACTIONAL_LOG2;
 314         }
 315         return -EINVAL;
 316 }
 317 static const unsigned int ad7998_frequencies[] = {
 318         [AD7998_CYC_DIS]        = 0,
 319         [AD7998_CYC_TCONF_32]   = 15625,
 320         [AD7998_CYC_TCONF_64]   = 7812,
 321         [AD7998_CYC_TCONF_128]  = 3906,
 322         [AD7998_CYC_TCONF_512]  = 976,
 323         [AD7998_CYC_TCONF_1024] = 488,
 324         [AD7998_CYC_TCONF_2048] = 244,
 325 };
 326
 327 static ssize_t ad799x_read_frequency(struct device *dev,
 328                                         struct device_attribute *attr,
 329                                         char *buf)
 330 {
 331         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 332         struct ad799x_state *st = iio_priv(indio_dev);
 333
 334         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 335         if (ret < 0)
 336                 return ret;
 337
 338         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 339 }
 340
 341 static ssize_t ad799x_write_frequency(struct device *dev,
 342                                          struct device_attribute *attr,
 343                                          const char *buf,
 344                                          size_t len)
 345 {
 346         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 347         struct ad799x_state *st = iio_priv(indio_dev);
 348
 349         long val;
 350         int ret, i;
 351
 352         ret = kstrtol(buf, 10, &val);
 353         if (ret)
 354                 return ret;
 355
 356         mutex_lock(&indio_dev->mlock);
 357         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 358         if (ret < 0)
 359                 goto error_ret_mutex;
 360         /* Wipe the bits clean */
 361         ret &= ~AD7998_CYC_MASK;
 362
 363         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 364                 if (val == ad7998_frequencies[i])
 365                         break;
 366         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 367                 ret = -EINVAL;
 368                 goto error_ret_mutex;
 369         }
 370
 371         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 372                 ret | i);
 373         if (ret < 0)
 374                 goto error_ret_mutex;
 375         ret = len;
 376
 377 error_ret_mutex:
 378         mutex_unlock(&indio_dev->mlock);
 379
 380         return ret;
 381 }
 382
 383 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 384                                     const struct iio_chan_spec *chan,
 385                                     enum iio_event_type type,
 386                                     enum iio_event_direction dir)
 387 {
 388         struct ad799x_state *st = iio_priv(indio_dev);
 389
 390         if (!(st->config & AD7998_ALERT_EN))
 391                 return 0;
 392
 393         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 394                 return 1;
 395
 396         return 0;
 397 }
 398
 399 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 400                                      const struct iio_chan_spec *chan,
 401                                      enum iio_event_type type,
 402                                      enum iio_event_direction dir,
 403                                      int state)
 404 {
 405         struct ad799x_state *st = iio_priv(indio_dev);
 406         int ret;
 407
 408         ret = iio_device_claim_direct_mode(indio_dev);
 409         if (ret)
 410                 return ret;
 411
 412         if (state)
 413                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 414         else
 415                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 416
 417         if (st->config >> AD799X_CHANNEL_SHIFT)
 418                 st->config |= AD7998_ALERT_EN;
 419         else
 420                 st->config &= ~AD7998_ALERT_EN;
 421
 422         ret = ad799x_write_config(st, st->config);
 423         iio_device_release_direct_mode(indio_dev);
 424         return ret;
 425 }
 426
 427 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 428                                          enum iio_event_direction dir,
 429                                          enum iio_event_info info)
 430 {
 431         switch (info) {
 432         case IIO_EV_INFO_VALUE:
 433                 if (dir == IIO_EV_DIR_FALLING)
 434                         return AD7998_DATALOW_REG(chan->channel);
 435                 else
 436                         return AD7998_DATAHIGH_REG(chan->channel);
 437         case IIO_EV_INFO_HYSTERESIS:
 438                 return AD7998_HYST_REG(chan->channel);
 439         default:
 440                 return -EINVAL;
 441         }
 442
 443         return 0;
 444 }
 445
 446 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 447                                     const struct iio_chan_spec *chan,
 448                                     enum iio_event_type type,
 449                                     enum iio_event_direction dir,
 450                                     enum iio_event_info info,
 451                                     int val, int val2)
 452 {
 453         int ret;
 454         struct ad799x_state *st = iio_priv(indio_dev);
 455
 456         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 457                 return -EINVAL;
 458
 459         mutex_lock(&indio_dev->mlock);
 460         ret = i2c_smbus_write_word_swapped(st->client,
 461                 ad799x_threshold_reg(chan, dir, info),
 462                 val << chan->scan_type.shift);
 463         mutex_unlock(&indio_dev->mlock);
 464
 465         return ret;
 466 }
 467
 468 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 469                                     const struct iio_chan_spec *chan,
 470                                     enum iio_event_type type,
 471                                     enum iio_event_direction dir,
 472                                     enum iio_event_info info,
 473                                     int *val, int *val2)
 474 {
 475         int ret;
 476         struct ad799x_state *st = iio_priv(indio_dev);
 477
 478         mutex_lock(&indio_dev->mlock);
 479         ret = i2c_smbus_read_word_swapped(st->client,
 480                 ad799x_threshold_reg(chan, dir, info));
 481         mutex_unlock(&indio_dev->mlock);
 482         if (ret < 0)
 483                 return ret;
 484         *val = (ret >> chan->scan_type.shift) &
 485                 GENMASK(chan->scan_type.realbits - 1, 0);
 486
 487         return IIO_VAL_INT;
 488 }
 489
 490 static irqreturn_t ad799x_event_handler(int irq, void *private)
 491 {
 492         struct iio_dev *indio_dev = private;
 493         struct ad799x_state *st = iio_priv(private);
 494         int i, ret;
 495
 496         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 497         if (ret <= 0)
 498                 goto done;
 499
 500         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 501                 AD7998_ALERT_STAT_CLEAR) < 0)
 502                 goto done;
 503
 504         for (i = 0; i < 8; i++) {
 505                 if (ret & BIT(i))
 506                         iio_push_event(indio_dev,
 507                                        i & 0x1 ?
 508                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 509                                                             (i >> 1),
 510                                                             IIO_EV_TYPE_THRESH,
 511                                                             IIO_EV_DIR_RISING) :
 512                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 513                                                             (i >> 1),
 514                                                             IIO_EV_TYPE_THRESH,
 515                                                             IIO_EV_DIR_FALLING),
 516                                        iio_get_time_ns(indio_dev));
 517         }
 518
 519 done:
 520         return IRQ_HANDLED;
 521 }
 522
 523 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 524                               ad799x_read_frequency,
 525                               ad799x_write_frequency);
 526 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 527
 528 static struct attribute *ad799x_event_attributes[] = {
 529         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 530         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 531         NULL,
 532 };
 533
 534 static const struct attribute_group ad799x_event_attrs_group = {
 535         .attrs = ad799x_event_attributes,
 536 };
 537
 538 static const struct iio_info ad7991_info = {
 539         .read_raw = &ad799x_read_raw,
 540         .update_scan_mode = ad799x_update_scan_mode,
 541 };
 542
 543 static const struct iio_info ad7993_4_7_8_noirq_info = {
 544         .read_raw = &ad799x_read_raw,
 545         .update_scan_mode = ad799x_update_scan_mode,
 546 };
 547
 548 static const struct iio_info ad7993_4_7_8_irq_info = {
 549         .read_raw = &ad799x_read_raw,
 550         .event_attrs = &ad799x_event_attrs_group,
 551         .read_event_config = &ad799x_read_event_config,
 552         .write_event_config = &ad799x_write_event_config,
 553         .read_event_value = &ad799x_read_event_value,
 554         .write_event_value = &ad799x_write_event_value,
 555         .update_scan_mode = ad799x_update_scan_mode,
 556 };
 557
 558 static const struct iio_event_spec ad799x_events[] = {
 559         {
 560                 .type = IIO_EV_TYPE_THRESH,
 561                 .dir = IIO_EV_DIR_RISING,
 562                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 563                         BIT(IIO_EV_INFO_ENABLE),
 564         }, {
 565                 .type = IIO_EV_TYPE_THRESH,
 566                 .dir = IIO_EV_DIR_FALLING,
 567                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 568                         BIT(IIO_EV_INFO_ENABLE),
 569         }, {
 570                 .type = IIO_EV_TYPE_THRESH,
 571                 .dir = IIO_EV_DIR_EITHER,
 572                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 573         },
 574 };
 575
 576 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 577         .type = IIO_VOLTAGE, \
 578         .indexed = 1, \
 579         .channel = (_index), \
 580         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 581         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 582         .scan_index = (_index), \
 583         .scan_type = { \
 584                 .sign = 'u', \
 585                 .realbits = (_realbits), \
 586                 .storagebits = 16, \
 587                 .shift = 12 - (_realbits), \
 588                 .endianness = IIO_BE, \
 589         }, \
 590         .event_spec = _ev_spec, \
 591         .num_event_specs = _num_ev_spec, \
 592 }
 593
 594 #define AD799X_CHANNEL(_index, _realbits) \
 595         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 596
 597 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 598         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 599                 ARRAY_SIZE(ad799x_events))
 600
 601 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 602         [ad7991] = {
 603                 .num_channels = 5,
 604                 .noirq_config = {
 605                         .channel = {
 606                                 AD799X_CHANNEL(0, 12),
 607                                 AD799X_CHANNEL(1, 12),
 608                                 AD799X_CHANNEL(2, 12),
 609                                 AD799X_CHANNEL(3, 12),
 610                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 611                         },
 612                         .info = &ad7991_info,
 613                 },
 614         },
 615         [ad7995] = {
 616                 .num_channels = 5,
 617                 .noirq_config = {
 618                         .channel = {
 619                                 AD799X_CHANNEL(0, 10),
 620                                 AD799X_CHANNEL(1, 10),
 621                                 AD799X_CHANNEL(2, 10),
 622                                 AD799X_CHANNEL(3, 10),
 623                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 624                         },
 625                         .info = &ad7991_info,
 626                 },
 627         },
 628         [ad7999] = {
 629                 .num_channels = 5,
 630                 .noirq_config = {
 631                         .channel = {
 632                                 AD799X_CHANNEL(0, 8),
 633                                 AD799X_CHANNEL(1, 8),
 634                                 AD799X_CHANNEL(2, 8),
 635                                 AD799X_CHANNEL(3, 8),
 636                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 637                         },
 638                         .info = &ad7991_info,
 639                 },
 640         },
 641         [ad7992] = {
 642                 .num_channels = 3,
 643                 .noirq_config = {
 644                         .channel = {
 645                                 AD799X_CHANNEL(0, 12),
 646                                 AD799X_CHANNEL(1, 12),
 647                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 648                         },
 649                         .info = &ad7993_4_7_8_noirq_info,
 650                 },
 651                 .irq_config = {
 652                         .channel = {
 653                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 654                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 655                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 656                         },
 657                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 658                         .info = &ad7993_4_7_8_irq_info,
 659                 },
 660         },
 661         [ad7993] = {
 662                 .num_channels = 5,
 663                 .noirq_config = {
 664                         .channel = {
 665                                 AD799X_CHANNEL(0, 10),
 666                                 AD799X_CHANNEL(1, 10),
 667                                 AD799X_CHANNEL(2, 10),
 668                                 AD799X_CHANNEL(3, 10),
 669                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 670                         },
 671                         .info = &ad7993_4_7_8_noirq_info,
 672                 },
 673                 .irq_config = {
 674                         .channel = {
 675                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 676                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 677                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 678                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 679                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 680                         },
 681                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 682                         .info = &ad7993_4_7_8_irq_info,
 683                 },
 684         },
 685         [ad7994] = {
 686                 .num_channels = 5,
 687                 .noirq_config = {
 688                         .channel = {
 689                                 AD799X_CHANNEL(0, 12),
 690                                 AD799X_CHANNEL(1, 12),
 691                                 AD799X_CHANNEL(2, 12),
 692                                 AD799X_CHANNEL(3, 12),
 693                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 694                         },
 695                         .info = &ad7993_4_7_8_noirq_info,
 696                 },
 697                 .irq_config = {
 698                         .channel = {
 699                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 700                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 701                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 702                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 703                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 704                         },
 705                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 706                         .info = &ad7993_4_7_8_irq_info,
 707                 },
 708         },
 709         [ad7997] = {
 710                 .num_channels = 9,
 711                 .noirq_config = {
 712                         .channel = {
 713                                 AD799X_CHANNEL(0, 10),
 714                                 AD799X_CHANNEL(1, 10),
 715                                 AD799X_CHANNEL(2, 10),
 716                                 AD799X_CHANNEL(3, 10),
 717                                 AD799X_CHANNEL(4, 10),
 718                                 AD799X_CHANNEL(5, 10),
 719                                 AD799X_CHANNEL(6, 10),
 720                                 AD799X_CHANNEL(7, 10),
 721                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 722                         },
 723                         .info = &ad7993_4_7_8_noirq_info,
 724                 },
 725                 .irq_config = {
 726                         .channel = {
 727                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 728                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 729                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 730                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 731                                 AD799X_CHANNEL(4, 10),
 732                                 AD799X_CHANNEL(5, 10),
 733                                 AD799X_CHANNEL(6, 10),
 734                                 AD799X_CHANNEL(7, 10),
 735                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 736                         },
 737                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 738                         .info = &ad7993_4_7_8_irq_info,
 739                 },
 740         },
 741         [ad7998] = {
 742                 .num_channels = 9,
 743                 .noirq_config = {
 744                         .channel = {
 745                                 AD799X_CHANNEL(0, 12),
 746                                 AD799X_CHANNEL(1, 12),
 747                                 AD799X_CHANNEL(2, 12),
 748                                 AD799X_CHANNEL(3, 12),
 749                                 AD799X_CHANNEL(4, 12),
 750                                 AD799X_CHANNEL(5, 12),
 751                                 AD799X_CHANNEL(6, 12),
 752                                 AD799X_CHANNEL(7, 12),
 753                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 754                         },
 755                         .info = &ad7993_4_7_8_noirq_info,
 756                 },
 757                 .irq_config = {
 758                         .channel = {
 759                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 760                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 761                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 762                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 763                                 AD799X_CHANNEL(4, 12),
 764                                 AD799X_CHANNEL(5, 12),
 765                                 AD799X_CHANNEL(6, 12),
 766                                 AD799X_CHANNEL(7, 12),
 767                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 768                         },
 769                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 770                         .info = &ad7993_4_7_8_irq_info,
 771                 },
 772         },
 773 };
 774
 775 static int ad799x_probe(struct i2c_client *client,
 776                                    const struct i2c_device_id *id)
 777 {
 778         int ret;
 779         struct ad799x_state *st;
 780         struct iio_dev *indio_dev;
 781         const struct ad799x_chip_info *chip_info =
 782                 &ad799x_chip_info_tbl[id->driver_data];
 783
 784         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 785         if (indio_dev == NULL)
 786                 return -ENOMEM;
 787
 788         st = iio_priv(indio_dev);
 789         /* this is only used for device removal purposes */
 790         i2c_set_clientdata(client, indio_dev);
 791
 792         st->id = id->driver_data;
 793         if (client->irq > 0 && chip_info->irq_config.info)
 794                 st->chip_config = &chip_info->irq_config;
 795         else
 796                 st->chip_config = &chip_info->noirq_config;
 797
 798         /* TODO: Add pdata options for filtering and bit delay */
 799
 800         st->reg = devm_regulator_get(&client->dev, "vcc");
 801         if (IS_ERR(st->reg))
 802                 return PTR_ERR(st->reg);
 803         ret = regulator_enable(st->reg);
 804         if (ret)
 805                 return ret;
 806         st->vref = devm_regulator_get(&client->dev, "vref");
 807         if (IS_ERR(st->vref)) {
 808                 ret = PTR_ERR(st->vref);
 809                 goto error_disable_reg;
 810         }
 811         ret = regulator_enable(st->vref);
 812         if (ret)
 813                 goto error_disable_reg;
 814
 815         st->client = client;
 816
 817         indio_dev->name = id->name;
 818         indio_dev->info = st->chip_config->info;
 819
 820         indio_dev->modes = INDIO_DIRECT_MODE;
 821         indio_dev->channels = st->chip_config->channel;
 822         indio_dev->num_channels = chip_info->num_channels;
 823
 824         ret = ad799x_update_config(st, st->chip_config->default_config);
 825         if (ret)
 826                 goto error_disable_vref;
 827
 828         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 829                 &ad799x_trigger_handler, NULL);
 830         if (ret)
 831                 goto error_disable_vref;
 832
 833         if (client->irq > 0) {
 834                 ret = devm_request_threaded_irq(&client->dev,
 835                                                 client->irq,
 836                                                 NULL,
 837                                                 ad799x_event_handler,
 838                                                 IRQF_TRIGGER_FALLING |
 839                                                 IRQF_ONESHOT,
 840                                                 client->name,
 841                                                 indio_dev);
 842                 if (ret)
 843                         goto error_cleanup_ring;
 844         }
 845         ret = iio_device_register(indio_dev);
 846         if (ret)
 847                 goto error_cleanup_ring;
 848
 849         return 0;
 850
 851 error_cleanup_ring:
 852         iio_triggered_buffer_cleanup(indio_dev);
 853 error_disable_vref:
 854         regulator_disable(st->vref);
 855 error_disable_reg:
 856         regulator_disable(st->reg);
 857
 858         return ret;
 859 }
 860
 861 static int ad799x_remove(struct i2c_client *client)
 862 {
 863         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 864         struct ad799x_state *st = iio_priv(indio_dev);
 865
 866         iio_device_unregister(indio_dev);
 867
 868         iio_triggered_buffer_cleanup(indio_dev);
 869         regulator_disable(st->vref);
 870         regulator_disable(st->reg);
 871         kfree(st->rx_buf);
 872
 873         return 0;
 874 }
 875
 876 static int __maybe_unused ad799x_suspend(struct device *dev)
 877 {
 878         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 879         struct ad799x_state *st = iio_priv(indio_dev);
 880
 881         regulator_disable(st->vref);
 882         regulator_disable(st->reg);
 883
 884         return 0;
 885 }
 886
 887 static int __maybe_unused ad799x_resume(struct device *dev)
 888 {
 889         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 890         struct ad799x_state *st = iio_priv(indio_dev);
 891         int ret;
 892
 893         ret = regulator_enable(st->reg);
 894         if (ret) {
 895                 dev_err(dev, "Unable to enable vcc regulator\n");
 896                 return ret;
 897         }
 898         ret = regulator_enable(st->vref);
 899         if (ret) {
 900                 regulator_disable(st->reg);
 901                 dev_err(dev, "Unable to enable vref regulator\n");
 902                 return ret;
 903         }
 904
 905         /* resync config */
 906         ret = ad799x_update_config(st, st->config);
 907         if (ret) {
 908                 regulator_disable(st->vref);
 909                 regulator_disable(st->reg);
 910                 return ret;
 911         }
 912
 913         return 0;
 914 }
 915
 916 static SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
 917
 918 static const struct i2c_device_id ad799x_id[] = {
 919         { "ad7991", ad7991 },
 920         { "ad7995", ad7995 },
 921         { "ad7999", ad7999 },
 922         { "ad7992", ad7992 },
 923         { "ad7993", ad7993 },
 924         { "ad7994", ad7994 },
 925         { "ad7997", ad7997 },
 926         { "ad7998", ad7998 },
 927         {}
 928 };
 929
 930 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 931
 932 static struct i2c_driver ad799x_driver = {
 933         .driver = {
 934                 .name = "ad799x",
 935                 .pm = &ad799x_pm_ops,
 936         },
 937         .probe = ad799x_probe,
 938         .remove = ad799x_remove,
 939         .id_table = ad799x_id,
 940 };
 941 module_i2c_driver(ad799x_driver);
 942
 943 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 944 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 945 MODULE_LICENSE("GPL v2");