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 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 186 {
 187         struct iio_poll_func *pf = p;
 188         struct iio_dev *indio_dev = pf->indio_dev;
 189         struct ad799x_state *st = iio_priv(indio_dev);
 190         int b_sent;
 191         u8 cmd;
 192
 193         switch (st->id) {
 194         case ad7991:
 195         case ad7995:
 196         case ad7999:
 197                 cmd = st->config |
 198                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 199                 break;
 200         case ad7992:
 201         case ad7993:
 202         case ad7994:
 203                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 204                         AD7998_CONV_RES_REG;
 205                 break;
 206         case ad7997:
 207         case ad7998:
 208                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 209                 break;
 210         default:
 211                 cmd = 0;
 212         }
 213
 214         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 215                         cmd, st->transfer_size, st->rx_buf);
 216         if (b_sent < 0)
 217                 goto out;
 218
 219         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 220                         iio_get_time_ns(indio_dev));
 221 out:
 222         iio_trigger_notify_done(indio_dev->trig);
 223
 224         return IRQ_HANDLED;
 225 }
 226
 227 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 228         const unsigned long *scan_mask)
 229 {
 230         struct ad799x_state *st = iio_priv(indio_dev);
 231
 232         kfree(st->rx_buf);
 233         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 234         if (!st->rx_buf)
 235                 return -ENOMEM;
 236
 237         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 238
 239         switch (st->id) {
 240         case ad7992:
 241         case ad7993:
 242         case ad7994:
 243         case ad7997:
 244         case ad7998:
 245                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 246                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 247                 return ad799x_write_config(st, st->config);
 248         default:
 249                 return 0;
 250         }
 251 }
 252
 253 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 254 {
 255         u8 cmd;
 256
 257         switch (st->id) {
 258         case ad7991:
 259         case ad7995:
 260         case ad7999:
 261                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 262                 break;
 263         case ad7992:
 264         case ad7993:
 265         case ad7994:
 266                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 267                 break;
 268         case ad7997:
 269         case ad7998:
 270                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 271                 break;
 272         default:
 273                 return -EINVAL;
 274         }
 275
 276         return i2c_smbus_read_word_swapped(st->client, cmd);
 277 }
 278
 279 static int ad799x_read_raw(struct iio_dev *indio_dev,
 280                            struct iio_chan_spec const *chan,
 281                            int *val,
 282                            int *val2,
 283                            long m)
 284 {
 285         int ret;
 286         struct ad799x_state *st = iio_priv(indio_dev);
 287
 288         switch (m) {
 289         case IIO_CHAN_INFO_RAW:
 290                 ret = iio_device_claim_direct_mode(indio_dev);
 291                 if (ret)
 292                         return ret;
 293                 ret = ad799x_scan_direct(st, chan->scan_index);
 294                 iio_device_release_direct_mode(indio_dev);
 295
 296                 if (ret < 0)
 297                         return ret;
 298                 *val = (ret >> chan->scan_type.shift) &
 299                         GENMASK(chan->scan_type.realbits - 1, 0);
 300                 return IIO_VAL_INT;
 301         case IIO_CHAN_INFO_SCALE:
 302                 if (st->vref)
 303                         ret = regulator_get_voltage(st->vref);
 304                 else
 305                         ret = regulator_get_voltage(st->reg);
 306
 307                 if (ret < 0)
 308                         return ret;
 309                 *val = ret / 1000;
 310                 *val2 = chan->scan_type.realbits;
 311                 return IIO_VAL_FRACTIONAL_LOG2;
 312         }
 313         return -EINVAL;
 314 }
 315 static const unsigned int ad7998_frequencies[] = {
 316         [AD7998_CYC_DIS]        = 0,
 317         [AD7998_CYC_TCONF_32]   = 15625,
 318         [AD7998_CYC_TCONF_64]   = 7812,
 319         [AD7998_CYC_TCONF_128]  = 3906,
 320         [AD7998_CYC_TCONF_512]  = 976,
 321         [AD7998_CYC_TCONF_1024] = 488,
 322         [AD7998_CYC_TCONF_2048] = 244,
 323 };
 324
 325 static ssize_t ad799x_read_frequency(struct device *dev,
 326                                         struct device_attribute *attr,
 327                                         char *buf)
 328 {
 329         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 330         struct ad799x_state *st = iio_priv(indio_dev);
 331
 332         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 333         if (ret < 0)
 334                 return ret;
 335
 336         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 337 }
 338
 339 static ssize_t ad799x_write_frequency(struct device *dev,
 340                                          struct device_attribute *attr,
 341                                          const char *buf,
 342                                          size_t len)
 343 {
 344         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 345         struct ad799x_state *st = iio_priv(indio_dev);
 346
 347         long val;
 348         int ret, i;
 349
 350         ret = kstrtol(buf, 10, &val);
 351         if (ret)
 352                 return ret;
 353
 354         mutex_lock(&indio_dev->mlock);
 355         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 356         if (ret < 0)
 357                 goto error_ret_mutex;
 358         /* Wipe the bits clean */
 359         ret &= ~AD7998_CYC_MASK;
 360
 361         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 362                 if (val == ad7998_frequencies[i])
 363                         break;
 364         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 365                 ret = -EINVAL;
 366                 goto error_ret_mutex;
 367         }
 368
 369         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 370                 ret | i);
 371         if (ret < 0)
 372                 goto error_ret_mutex;
 373         ret = len;
 374
 375 error_ret_mutex:
 376         mutex_unlock(&indio_dev->mlock);
 377
 378         return ret;
 379 }
 380
 381 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 382                                     const struct iio_chan_spec *chan,
 383                                     enum iio_event_type type,
 384                                     enum iio_event_direction dir)
 385 {
 386         struct ad799x_state *st = iio_priv(indio_dev);
 387
 388         if (!(st->config & AD7998_ALERT_EN))
 389                 return 0;
 390
 391         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 392                 return 1;
 393
 394         return 0;
 395 }
 396
 397 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 398                                      const struct iio_chan_spec *chan,
 399                                      enum iio_event_type type,
 400                                      enum iio_event_direction dir,
 401                                      int state)
 402 {
 403         struct ad799x_state *st = iio_priv(indio_dev);
 404         int ret;
 405
 406         ret = iio_device_claim_direct_mode(indio_dev);
 407         if (ret)
 408                 return ret;
 409
 410         if (state)
 411                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 412         else
 413                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 414
 415         if (st->config >> AD799X_CHANNEL_SHIFT)
 416                 st->config |= AD7998_ALERT_EN;
 417         else
 418                 st->config &= ~AD7998_ALERT_EN;
 419
 420         ret = ad799x_write_config(st, st->config);
 421         iio_device_release_direct_mode(indio_dev);
 422         return ret;
 423 }
 424
 425 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 426                                          enum iio_event_direction dir,
 427                                          enum iio_event_info info)
 428 {
 429         switch (info) {
 430         case IIO_EV_INFO_VALUE:
 431                 if (dir == IIO_EV_DIR_FALLING)
 432                         return AD7998_DATALOW_REG(chan->channel);
 433                 else
 434                         return AD7998_DATAHIGH_REG(chan->channel);
 435         case IIO_EV_INFO_HYSTERESIS:
 436                 return AD7998_HYST_REG(chan->channel);
 437         default:
 438                 return -EINVAL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 445                                     const struct iio_chan_spec *chan,
 446                                     enum iio_event_type type,
 447                                     enum iio_event_direction dir,
 448                                     enum iio_event_info info,
 449                                     int val, int val2)
 450 {
 451         int ret;
 452         struct ad799x_state *st = iio_priv(indio_dev);
 453
 454         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 455                 return -EINVAL;
 456
 457         mutex_lock(&indio_dev->mlock);
 458         ret = i2c_smbus_write_word_swapped(st->client,
 459                 ad799x_threshold_reg(chan, dir, info),
 460                 val << chan->scan_type.shift);
 461         mutex_unlock(&indio_dev->mlock);
 462
 463         return ret;
 464 }
 465
 466 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 467                                     const struct iio_chan_spec *chan,
 468                                     enum iio_event_type type,
 469                                     enum iio_event_direction dir,
 470                                     enum iio_event_info info,
 471                                     int *val, int *val2)
 472 {
 473         int ret;
 474         struct ad799x_state *st = iio_priv(indio_dev);
 475
 476         mutex_lock(&indio_dev->mlock);
 477         ret = i2c_smbus_read_word_swapped(st->client,
 478                 ad799x_threshold_reg(chan, dir, info));
 479         mutex_unlock(&indio_dev->mlock);
 480         if (ret < 0)
 481                 return ret;
 482         *val = (ret >> chan->scan_type.shift) &
 483                 GENMASK(chan->scan_type.realbits - 1, 0);
 484
 485         return IIO_VAL_INT;
 486 }
 487
 488 static irqreturn_t ad799x_event_handler(int irq, void *private)
 489 {
 490         struct iio_dev *indio_dev = private;
 491         struct ad799x_state *st = iio_priv(private);
 492         int i, ret;
 493
 494         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 495         if (ret <= 0)
 496                 goto done;
 497
 498         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 499                 AD7998_ALERT_STAT_CLEAR) < 0)
 500                 goto done;
 501
 502         for (i = 0; i < 8; i++) {
 503                 if (ret & BIT(i))
 504                         iio_push_event(indio_dev,
 505                                        i & 0x1 ?
 506                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 507                                                             (i >> 1),
 508                                                             IIO_EV_TYPE_THRESH,
 509                                                             IIO_EV_DIR_RISING) :
 510                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 511                                                             (i >> 1),
 512                                                             IIO_EV_TYPE_THRESH,
 513                                                             IIO_EV_DIR_FALLING),
 514                                        iio_get_time_ns(indio_dev));
 515         }
 516
 517 done:
 518         return IRQ_HANDLED;
 519 }
 520
 521 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 522                               ad799x_read_frequency,
 523                               ad799x_write_frequency);
 524 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 525
 526 static struct attribute *ad799x_event_attributes[] = {
 527         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 528         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 529         NULL,
 530 };
 531
 532 static const struct attribute_group ad799x_event_attrs_group = {
 533         .attrs = ad799x_event_attributes,
 534 };
 535
 536 static const struct iio_info ad7991_info = {
 537         .read_raw = &ad799x_read_raw,
 538         .update_scan_mode = ad799x_update_scan_mode,
 539 };
 540
 541 static const struct iio_info ad7993_4_7_8_noirq_info = {
 542         .read_raw = &ad799x_read_raw,
 543         .update_scan_mode = ad799x_update_scan_mode,
 544 };
 545
 546 static const struct iio_info ad7993_4_7_8_irq_info = {
 547         .read_raw = &ad799x_read_raw,
 548         .event_attrs = &ad799x_event_attrs_group,
 549         .read_event_config = &ad799x_read_event_config,
 550         .write_event_config = &ad799x_write_event_config,
 551         .read_event_value = &ad799x_read_event_value,
 552         .write_event_value = &ad799x_write_event_value,
 553         .update_scan_mode = ad799x_update_scan_mode,
 554 };
 555
 556 static const struct iio_event_spec ad799x_events[] = {
 557         {
 558                 .type = IIO_EV_TYPE_THRESH,
 559                 .dir = IIO_EV_DIR_RISING,
 560                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 561                         BIT(IIO_EV_INFO_ENABLE),
 562         }, {
 563                 .type = IIO_EV_TYPE_THRESH,
 564                 .dir = IIO_EV_DIR_FALLING,
 565                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 566                         BIT(IIO_EV_INFO_ENABLE),
 567         }, {
 568                 .type = IIO_EV_TYPE_THRESH,
 569                 .dir = IIO_EV_DIR_EITHER,
 570                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 571         },
 572 };
 573
 574 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 575         .type = IIO_VOLTAGE, \
 576         .indexed = 1, \
 577         .channel = (_index), \
 578         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 579         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 580         .scan_index = (_index), \
 581         .scan_type = { \
 582                 .sign = 'u', \
 583                 .realbits = (_realbits), \
 584                 .storagebits = 16, \
 585                 .shift = 12 - (_realbits), \
 586                 .endianness = IIO_BE, \
 587         }, \
 588         .event_spec = _ev_spec, \
 589         .num_event_specs = _num_ev_spec, \
 590 }
 591
 592 #define AD799X_CHANNEL(_index, _realbits) \
 593         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 594
 595 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 596         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 597                 ARRAY_SIZE(ad799x_events))
 598
 599 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 600         [ad7991] = {
 601                 .num_channels = 5,
 602                 .noirq_config = {
 603                         .channel = {
 604                                 AD799X_CHANNEL(0, 12),
 605                                 AD799X_CHANNEL(1, 12),
 606                                 AD799X_CHANNEL(2, 12),
 607                                 AD799X_CHANNEL(3, 12),
 608                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 609                         },
 610                         .info = &ad7991_info,
 611                 },
 612         },
 613         [ad7995] = {
 614                 .num_channels = 5,
 615                 .noirq_config = {
 616                         .channel = {
 617                                 AD799X_CHANNEL(0, 10),
 618                                 AD799X_CHANNEL(1, 10),
 619                                 AD799X_CHANNEL(2, 10),
 620                                 AD799X_CHANNEL(3, 10),
 621                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 622                         },
 623                         .info = &ad7991_info,
 624                 },
 625         },
 626         [ad7999] = {
 627                 .num_channels = 5,
 628                 .noirq_config = {
 629                         .channel = {
 630                                 AD799X_CHANNEL(0, 8),
 631                                 AD799X_CHANNEL(1, 8),
 632                                 AD799X_CHANNEL(2, 8),
 633                                 AD799X_CHANNEL(3, 8),
 634                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 635                         },
 636                         .info = &ad7991_info,
 637                 },
 638         },
 639         [ad7992] = {
 640                 .num_channels = 3,
 641                 .noirq_config = {
 642                         .channel = {
 643                                 AD799X_CHANNEL(0, 12),
 644                                 AD799X_CHANNEL(1, 12),
 645                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 646                         },
 647                         .info = &ad7993_4_7_8_noirq_info,
 648                 },
 649                 .irq_config = {
 650                         .channel = {
 651                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 652                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 653                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 654                         },
 655                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 656                         .info = &ad7993_4_7_8_irq_info,
 657                 },
 658         },
 659         [ad7993] = {
 660                 .num_channels = 5,
 661                 .noirq_config = {
 662                         .channel = {
 663                                 AD799X_CHANNEL(0, 10),
 664                                 AD799X_CHANNEL(1, 10),
 665                                 AD799X_CHANNEL(2, 10),
 666                                 AD799X_CHANNEL(3, 10),
 667                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 668                         },
 669                         .info = &ad7993_4_7_8_noirq_info,
 670                 },
 671                 .irq_config = {
 672                         .channel = {
 673                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 674                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 675                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 676                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 677                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 678                         },
 679                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 680                         .info = &ad7993_4_7_8_irq_info,
 681                 },
 682         },
 683         [ad7994] = {
 684                 .num_channels = 5,
 685                 .noirq_config = {
 686                         .channel = {
 687                                 AD799X_CHANNEL(0, 12),
 688                                 AD799X_CHANNEL(1, 12),
 689                                 AD799X_CHANNEL(2, 12),
 690                                 AD799X_CHANNEL(3, 12),
 691                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 692                         },
 693                         .info = &ad7993_4_7_8_noirq_info,
 694                 },
 695                 .irq_config = {
 696                         .channel = {
 697                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 698                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 699                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 700                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 701                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 702                         },
 703                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 704                         .info = &ad7993_4_7_8_irq_info,
 705                 },
 706         },
 707         [ad7997] = {
 708                 .num_channels = 9,
 709                 .noirq_config = {
 710                         .channel = {
 711                                 AD799X_CHANNEL(0, 10),
 712                                 AD799X_CHANNEL(1, 10),
 713                                 AD799X_CHANNEL(2, 10),
 714                                 AD799X_CHANNEL(3, 10),
 715                                 AD799X_CHANNEL(4, 10),
 716                                 AD799X_CHANNEL(5, 10),
 717                                 AD799X_CHANNEL(6, 10),
 718                                 AD799X_CHANNEL(7, 10),
 719                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 720                         },
 721                         .info = &ad7993_4_7_8_noirq_info,
 722                 },
 723                 .irq_config = {
 724                         .channel = {
 725                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 726                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 727                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 728                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 729                                 AD799X_CHANNEL(4, 10),
 730                                 AD799X_CHANNEL(5, 10),
 731                                 AD799X_CHANNEL(6, 10),
 732                                 AD799X_CHANNEL(7, 10),
 733                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 734                         },
 735                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 736                         .info = &ad7993_4_7_8_irq_info,
 737                 },
 738         },
 739         [ad7998] = {
 740                 .num_channels = 9,
 741                 .noirq_config = {
 742                         .channel = {
 743                                 AD799X_CHANNEL(0, 12),
 744                                 AD799X_CHANNEL(1, 12),
 745                                 AD799X_CHANNEL(2, 12),
 746                                 AD799X_CHANNEL(3, 12),
 747                                 AD799X_CHANNEL(4, 12),
 748                                 AD799X_CHANNEL(5, 12),
 749                                 AD799X_CHANNEL(6, 12),
 750                                 AD799X_CHANNEL(7, 12),
 751                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 752                         },
 753                         .info = &ad7993_4_7_8_noirq_info,
 754                 },
 755                 .irq_config = {
 756                         .channel = {
 757                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 758                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 759                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 760                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 761                                 AD799X_CHANNEL(4, 12),
 762                                 AD799X_CHANNEL(5, 12),
 763                                 AD799X_CHANNEL(6, 12),
 764                                 AD799X_CHANNEL(7, 12),
 765                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 766                         },
 767                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 768                         .info = &ad7993_4_7_8_irq_info,
 769                 },
 770         },
 771 };
 772
 773 static int ad799x_probe(struct i2c_client *client,
 774                                    const struct i2c_device_id *id)
 775 {
 776         int ret;
 777         int extra_config = 0;
 778         struct ad799x_state *st;
 779         struct iio_dev *indio_dev;
 780         const struct ad799x_chip_info *chip_info =
 781                 &ad799x_chip_info_tbl[id->driver_data];
 782
 783         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 784         if (indio_dev == NULL)
 785                 return -ENOMEM;
 786
 787         st = iio_priv(indio_dev);
 788         /* this is only used for device removal purposes */
 789         i2c_set_clientdata(client, indio_dev);
 790
 791         st->id = id->driver_data;
 792         if (client->irq > 0 && chip_info->irq_config.info)
 793                 st->chip_config = &chip_info->irq_config;
 794         else
 795                 st->chip_config = &chip_info->noirq_config;
 796
 797         /* TODO: Add pdata options for filtering and bit delay */
 798
 799         st->reg = devm_regulator_get(&client->dev, "vcc");
 800         if (IS_ERR(st->reg))
 801                 return PTR_ERR(st->reg);
 802         ret = regulator_enable(st->reg);
 803         if (ret)
 804                 return ret;
 805
 806         /* check if an external reference is supplied */
 807         st->vref = devm_regulator_get_optional(&client->dev, "vref");
 808
 809         if (IS_ERR(st->vref)) {
 810                 if (PTR_ERR(st->vref) == -ENODEV) {
 811                         st->vref = NULL;
 812                         dev_info(&client->dev, "Using VCC reference voltage\n");
 813                 } else {
 814                         ret = PTR_ERR(st->vref);
 815                         goto error_disable_reg;
 816                 }
 817         }
 818
 819         if (st->vref) {
 820                 /*
 821                  * Use external reference voltage if supported by hardware.
 822                  * This is optional if voltage / regulator present, use VCC otherwise.
 823                  */
 824                 if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
 825                         dev_info(&client->dev, "Using external reference voltage\n");
 826                         extra_config |= AD7991_REF_SEL;
 827                         ret = regulator_enable(st->vref);
 828                         if (ret)
 829                                 goto error_disable_reg;
 830                 } else {
 831                         st->vref = NULL;
 832                         dev_warn(&client->dev, "Supplied reference not supported\n");
 833                 }
 834         }
 835
 836         st->client = client;
 837
 838         indio_dev->name = id->name;
 839         indio_dev->info = st->chip_config->info;
 840
 841         indio_dev->modes = INDIO_DIRECT_MODE;
 842         indio_dev->channels = st->chip_config->channel;
 843         indio_dev->num_channels = chip_info->num_channels;
 844
 845         ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
 846         if (ret)
 847                 goto error_disable_vref;
 848
 849         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 850                 &ad799x_trigger_handler, NULL);
 851         if (ret)
 852                 goto error_disable_vref;
 853
 854         if (client->irq > 0) {
 855                 ret = devm_request_threaded_irq(&client->dev,
 856                                                 client->irq,
 857                                                 NULL,
 858                                                 ad799x_event_handler,
 859                                                 IRQF_TRIGGER_FALLING |
 860                                                 IRQF_ONESHOT,
 861                                                 client->name,
 862                                                 indio_dev);
 863                 if (ret)
 864                         goto error_cleanup_ring;
 865         }
 866         ret = iio_device_register(indio_dev);
 867         if (ret)
 868                 goto error_cleanup_ring;
 869
 870         return 0;
 871
 872 error_cleanup_ring:
 873         iio_triggered_buffer_cleanup(indio_dev);
 874 error_disable_vref:
 875         if (st->vref)
 876                 regulator_disable(st->vref);
 877 error_disable_reg:
 878         regulator_disable(st->reg);
 879
 880         return ret;
 881 }
 882
 883 static int ad799x_remove(struct i2c_client *client)
 884 {
 885         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 886         struct ad799x_state *st = iio_priv(indio_dev);
 887
 888         iio_device_unregister(indio_dev);
 889
 890         iio_triggered_buffer_cleanup(indio_dev);
 891         if (st->vref)
 892                 regulator_disable(st->vref);
 893         regulator_disable(st->reg);
 894         kfree(st->rx_buf);
 895
 896         return 0;
 897 }
 898
 899 static int ad799x_suspend(struct device *dev)
 900 {
 901         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 902         struct ad799x_state *st = iio_priv(indio_dev);
 903
 904         if (st->vref)
 905                 regulator_disable(st->vref);
 906         regulator_disable(st->reg);
 907
 908         return 0;
 909 }
 910
 911 static int ad799x_resume(struct device *dev)
 912 {
 913         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 914         struct ad799x_state *st = iio_priv(indio_dev);
 915         int ret;
 916
 917         ret = regulator_enable(st->reg);
 918         if (ret) {
 919                 dev_err(dev, "Unable to enable vcc regulator\n");
 920                 return ret;
 921         }
 922
 923         if (st->vref) {
 924                 ret = regulator_enable(st->vref);
 925                 if (ret) {
 926                         regulator_disable(st->reg);
 927                         dev_err(dev, "Unable to enable vref regulator\n");
 928                         return ret;
 929                 }
 930         }
 931
 932         /* resync config */
 933         ret = ad799x_update_config(st, st->config);
 934         if (ret) {
 935                 if (st->vref)
 936                         regulator_disable(st->vref);
 937                 regulator_disable(st->reg);
 938                 return ret;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
 945
 946 static const struct i2c_device_id ad799x_id[] = {
 947         { "ad7991", ad7991 },
 948         { "ad7995", ad7995 },
 949         { "ad7999", ad7999 },
 950         { "ad7992", ad7992 },
 951         { "ad7993", ad7993 },
 952         { "ad7994", ad7994 },
 953         { "ad7997", ad7997 },
 954         { "ad7998", ad7998 },
 955         {}
 956 };
 957
 958 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 959
 960 static struct i2c_driver ad799x_driver = {
 961         .driver = {
 962                 .name = "ad799x",
 963                 .pm = pm_sleep_ptr(&ad799x_pm_ops),
 964         },
 965         .probe = ad799x_probe,
 966         .remove = ad799x_remove,
 967         .id_table = ad799x_id,
 968 };
 969 module_i2c_driver(ad799x_driver);
 970
 971 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 972 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 973 MODULE_LICENSE("GPL v2");