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