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/mutex.h>
  32 #include <linux/bitops.h>
  33
  34 #include <linux/iio/iio.h>
  35 #include <linux/iio/sysfs.h>
  36 #include <linux/iio/events.h>
  37 #include <linux/iio/buffer.h>
  38 #include <linux/iio/trigger_consumer.h>
  39 #include <linux/iio/triggered_buffer.h>
  40
  41 #define AD799X_CHANNEL_SHIFT                    4
  42
  43 /*
  44  * AD7991, AD7995 and AD7999 defines
  45  */
  46
  47 #define AD7991_REF_SEL                          0x08
  48 #define AD7991_FLTR                             0x04
  49 #define AD7991_BIT_TRIAL_DELAY                  0x02
  50 #define AD7991_SAMPLE_DELAY                     0x01
  51
  52 /*
  53  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  54  */
  55
  56 #define AD7998_FLTR                             BIT(3)
  57 #define AD7998_ALERT_EN                         BIT(2)
  58 #define AD7998_BUSY_ALERT                       BIT(1)
  59 #define AD7998_BUSY_ALERT_POL                   BIT(0)
  60
  61 #define AD7998_CONV_RES_REG                     0x0
  62 #define AD7998_ALERT_STAT_REG                   0x1
  63 #define AD7998_CONF_REG                         0x2
  64 #define AD7998_CYCLE_TMR_REG                    0x3
  65
  66 #define AD7998_DATALOW_REG(x)                   ((x) * 3 + 0x4)
  67 #define AD7998_DATAHIGH_REG(x)                  ((x) * 3 + 0x5)
  68 #define AD7998_HYST_REG(x)                      ((x) * 3 + 0x6)
  69
  70 #define AD7998_CYC_MASK                         GENMASK(2, 0)
  71 #define AD7998_CYC_DIS                          0x0
  72 #define AD7998_CYC_TCONF_32                     0x1
  73 #define AD7998_CYC_TCONF_64                     0x2
  74 #define AD7998_CYC_TCONF_128                    0x3
  75 #define AD7998_CYC_TCONF_256                    0x4
  76 #define AD7998_CYC_TCONF_512                    0x5
  77 #define AD7998_CYC_TCONF_1024                   0x6
  78 #define AD7998_CYC_TCONF_2048                   0x7
  79
  80 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  81
  82 /*
  83  * AD7997 and AD7997 defines
  84  */
  85
  86 #define AD7997_8_READ_SINGLE                    BIT(7)
  87 #define AD7997_8_READ_SEQUENCE                  (BIT(6) | BIT(5) | BIT(4))
  88
  89 enum {
  90         ad7991,
  91         ad7995,
  92         ad7999,
  93         ad7992,
  94         ad7993,
  95         ad7994,
  96         ad7997,
  97         ad7998
  98 };
  99
 100 /**
 101  * struct ad799x_chip_config - chip specific information
 102  * @channel:            channel specification
 103  * @default_config:     device default configuration
 104  * @info:               pointer to iio_info struct
 105  */
 106 struct ad799x_chip_config {
 107         const struct iio_chan_spec      channel[9];
 108         u16                             default_config;
 109         const struct iio_info           *info;
 110 };
 111
 112 /**
 113  * struct ad799x_chip_info - chip specific information
 114  * @num_channels:       number of channels
 115  * @noirq_config:       device configuration w/o IRQ
 116  * @irq_config:         device configuration w/IRQ
 117  */
 118 struct ad799x_chip_info {
 119         int                             num_channels;
 120         const struct ad799x_chip_config noirq_config;
 121         const struct ad799x_chip_config irq_config;
 122 };
 123
 124 struct ad799x_state {
 125         struct i2c_client               *client;
 126         const struct ad799x_chip_config *chip_config;
 127         struct regulator                *reg;
 128         struct regulator                *vref;
 129         /* lock to protect against multiple access to the device */
 130         struct mutex                    lock;
 131         unsigned int                    id;
 132         u16                             config;
 133
 134         u8                              *rx_buf;
 135         unsigned int                    transfer_size;
 136 };
 137
 138 static int ad799x_write_config(struct ad799x_state *st, u16 val)
 139 {
 140         switch (st->id) {
 141         case ad7997:
 142         case ad7998:
 143                 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
 144                         val);
 145         case ad7992:
 146         case ad7993:
 147         case ad7994:
 148                 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
 149                         val);
 150         default:
 151                 /* Will be written when doing a conversion */
 152                 st->config = val;
 153                 return 0;
 154         }
 155 }
 156
 157 static int ad799x_read_config(struct ad799x_state *st)
 158 {
 159         switch (st->id) {
 160         case ad7997:
 161         case ad7998:
 162                 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
 163         case ad7992:
 164         case ad7993:
 165         case ad7994:
 166                 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
 167         default:
 168                 /* No readback support */
 169                 return st->config;
 170         }
 171 }
 172
 173 static int ad799x_update_config(struct ad799x_state *st, u16 config)
 174 {
 175         int ret;
 176
 177         ret = ad799x_write_config(st, config);
 178         if (ret < 0)
 179                 return ret;
 180         ret = ad799x_read_config(st);
 181         if (ret < 0)
 182                 return ret;
 183         st->config = ret;
 184
 185         return 0;
 186 }
 187
 188 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 189 {
 190         struct iio_poll_func *pf = p;
 191         struct iio_dev *indio_dev = pf->indio_dev;
 192         struct ad799x_state *st = iio_priv(indio_dev);
 193         int b_sent;
 194         u8 cmd;
 195
 196         switch (st->id) {
 197         case ad7991:
 198         case ad7995:
 199         case ad7999:
 200                 cmd = st->config |
 201                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 202                 break;
 203         case ad7992:
 204         case ad7993:
 205         case ad7994:
 206                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 207                         AD7998_CONV_RES_REG;
 208                 break;
 209         case ad7997:
 210         case ad7998:
 211                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 212                 break;
 213         default:
 214                 cmd = 0;
 215         }
 216
 217         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 218                         cmd, st->transfer_size, st->rx_buf);
 219         if (b_sent < 0)
 220                 goto out;
 221
 222         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 223                         iio_get_time_ns(indio_dev));
 224 out:
 225         iio_trigger_notify_done(indio_dev->trig);
 226
 227         return IRQ_HANDLED;
 228 }
 229
 230 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 231         const unsigned long *scan_mask)
 232 {
 233         struct ad799x_state *st = iio_priv(indio_dev);
 234
 235         kfree(st->rx_buf);
 236         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 237         if (!st->rx_buf)
 238                 return -ENOMEM;
 239
 240         st->transfer_size = bitmap_weight(scan_mask,
 241                                           iio_get_masklength(indio_dev)) * 2;
 242
 243         switch (st->id) {
 244         case ad7992:
 245         case ad7993:
 246         case ad7994:
 247         case ad7997:
 248         case ad7998:
 249                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 250                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 251                 return ad799x_write_config(st, st->config);
 252         default:
 253                 return 0;
 254         }
 255 }
 256
 257 static int ad799x_scan_direct(struct ad799x_state *st, unsigned int ch)
 258 {
 259         u8 cmd;
 260
 261         switch (st->id) {
 262         case ad7991:
 263         case ad7995:
 264         case ad7999:
 265                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 266                 break;
 267         case ad7992:
 268         case ad7993:
 269         case ad7994:
 270                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 271                 break;
 272         case ad7997:
 273         case ad7998:
 274                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 275                 break;
 276         default:
 277                 return -EINVAL;
 278         }
 279
 280         return i2c_smbus_read_word_swapped(st->client, cmd);
 281 }
 282
 283 static int ad799x_read_raw(struct iio_dev *indio_dev,
 284                            struct iio_chan_spec const *chan,
 285                            int *val,
 286                            int *val2,
 287                            long m)
 288 {
 289         int ret;
 290         struct ad799x_state *st = iio_priv(indio_dev);
 291
 292         switch (m) {
 293         case IIO_CHAN_INFO_RAW:
 294                 ret = iio_device_claim_direct_mode(indio_dev);
 295                 if (ret)
 296                         return ret;
 297                 mutex_lock(&st->lock);
 298                 ret = ad799x_scan_direct(st, chan->scan_index);
 299                 mutex_unlock(&st->lock);
 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                 if (st->vref)
 309                         ret = regulator_get_voltage(st->vref);
 310                 else
 311                         ret = regulator_get_voltage(st->reg);
 312
 313                 if (ret < 0)
 314                         return ret;
 315                 *val = ret / 1000;
 316                 *val2 = chan->scan_type.realbits;
 317                 return IIO_VAL_FRACTIONAL_LOG2;
 318         }
 319         return -EINVAL;
 320 }
 321 static const unsigned int ad7998_frequencies[] = {
 322         [AD7998_CYC_DIS]        = 0,
 323         [AD7998_CYC_TCONF_32]   = 15625,
 324         [AD7998_CYC_TCONF_64]   = 7812,
 325         [AD7998_CYC_TCONF_128]  = 3906,
 326         [AD7998_CYC_TCONF_512]  = 976,
 327         [AD7998_CYC_TCONF_1024] = 488,
 328         [AD7998_CYC_TCONF_2048] = 244,
 329 };
 330
 331 static ssize_t ad799x_read_frequency(struct device *dev,
 332                                         struct device_attribute *attr,
 333                                         char *buf)
 334 {
 335         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 336         struct ad799x_state *st = iio_priv(indio_dev);
 337
 338         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 339
 340         if (ret < 0)
 341                 return ret;
 342
 343         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 344 }
 345
 346 static ssize_t ad799x_write_frequency(struct device *dev,
 347                                          struct device_attribute *attr,
 348                                          const char *buf,
 349                                          size_t len)
 350 {
 351         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 352         struct ad799x_state *st = iio_priv(indio_dev);
 353
 354         long val;
 355         int ret, i;
 356
 357         ret = kstrtol(buf, 10, &val);
 358         if (ret)
 359                 return ret;
 360
 361         mutex_lock(&st->lock);
 362
 363         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 364         if (ret < 0)
 365                 goto error_ret_mutex;
 366         /* Wipe the bits clean */
 367         ret &= ~AD7998_CYC_MASK;
 368
 369         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 370                 if (val == ad7998_frequencies[i])
 371                         break;
 372         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 373                 ret = -EINVAL;
 374                 goto error_ret_mutex;
 375         }
 376
 377         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 378                 ret | i);
 379         if (ret < 0)
 380                 goto error_ret_mutex;
 381         ret = len;
 382
 383 error_ret_mutex:
 384         mutex_unlock(&st->lock);
 385
 386         return ret;
 387 }
 388
 389 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 390                                     const struct iio_chan_spec *chan,
 391                                     enum iio_event_type type,
 392                                     enum iio_event_direction dir)
 393 {
 394         struct ad799x_state *st = iio_priv(indio_dev);
 395
 396         if (!(st->config & AD7998_ALERT_EN))
 397                 return 0;
 398
 399         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 400                 return 1;
 401
 402         return 0;
 403 }
 404
 405 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 406                                      const struct iio_chan_spec *chan,
 407                                      enum iio_event_type type,
 408                                      enum iio_event_direction dir,
 409                                      bool state)
 410 {
 411         struct ad799x_state *st = iio_priv(indio_dev);
 412         int ret;
 413
 414         ret = iio_device_claim_direct_mode(indio_dev);
 415         if (ret)
 416                 return ret;
 417
 418         mutex_lock(&st->lock);
 419
 420         if (state)
 421                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 422         else
 423                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 424
 425         if (st->config >> AD799X_CHANNEL_SHIFT)
 426                 st->config |= AD7998_ALERT_EN;
 427         else
 428                 st->config &= ~AD7998_ALERT_EN;
 429
 430         ret = ad799x_write_config(st, st->config);
 431         mutex_unlock(&st->lock);
 432         iio_device_release_direct_mode(indio_dev);
 433         return ret;
 434 }
 435
 436 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 437                                          enum iio_event_direction dir,
 438                                          enum iio_event_info info)
 439 {
 440         switch (info) {
 441         case IIO_EV_INFO_VALUE:
 442                 if (dir == IIO_EV_DIR_FALLING)
 443                         return AD7998_DATALOW_REG(chan->channel);
 444                 else
 445                         return AD7998_DATAHIGH_REG(chan->channel);
 446         case IIO_EV_INFO_HYSTERESIS:
 447                 return AD7998_HYST_REG(chan->channel);
 448         default:
 449                 return -EINVAL;
 450         }
 451
 452         return 0;
 453 }
 454
 455 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 456                                     const struct iio_chan_spec *chan,
 457                                     enum iio_event_type type,
 458                                     enum iio_event_direction dir,
 459                                     enum iio_event_info info,
 460                                     int val, int val2)
 461 {
 462         int ret;
 463         struct ad799x_state *st = iio_priv(indio_dev);
 464
 465         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 466                 return -EINVAL;
 467
 468         ret = i2c_smbus_write_word_swapped(st->client,
 469                 ad799x_threshold_reg(chan, dir, info),
 470                 val << chan->scan_type.shift);
 471
 472         return ret;
 473 }
 474
 475 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 476                                     const struct iio_chan_spec *chan,
 477                                     enum iio_event_type type,
 478                                     enum iio_event_direction dir,
 479                                     enum iio_event_info info,
 480                                     int *val, int *val2)
 481 {
 482         int ret;
 483         struct ad799x_state *st = iio_priv(indio_dev);
 484
 485         ret = i2c_smbus_read_word_swapped(st->client,
 486                 ad799x_threshold_reg(chan, dir, info));
 487         if (ret < 0)
 488                 return ret;
 489         *val = (ret >> chan->scan_type.shift) &
 490                 GENMASK(chan->scan_type.realbits - 1, 0);
 491
 492         return IIO_VAL_INT;
 493 }
 494
 495 static irqreturn_t ad799x_event_handler(int irq, void *private)
 496 {
 497         struct iio_dev *indio_dev = private;
 498         struct ad799x_state *st = iio_priv(private);
 499         int i, ret;
 500
 501         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 502         if (ret <= 0)
 503                 goto done;
 504
 505         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 506                 AD7998_ALERT_STAT_CLEAR) < 0)
 507                 goto done;
 508
 509         for (i = 0; i < 8; i++) {
 510                 if (ret & BIT(i))
 511                         iio_push_event(indio_dev,
 512                                        i & 0x1 ?
 513                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 514                                                             (i >> 1),
 515                                                             IIO_EV_TYPE_THRESH,
 516                                                             IIO_EV_DIR_RISING) :
 517                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 518                                                             (i >> 1),
 519                                                             IIO_EV_TYPE_THRESH,
 520                                                             IIO_EV_DIR_FALLING),
 521                                        iio_get_time_ns(indio_dev));
 522         }
 523
 524 done:
 525         return IRQ_HANDLED;
 526 }
 527
 528 static IIO_DEV_ATTR_SAMP_FREQ(0644,
 529                               ad799x_read_frequency,
 530                               ad799x_write_frequency);
 531 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 532
 533 static struct attribute *ad799x_event_attributes[] = {
 534         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 535         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 536         NULL,
 537 };
 538
 539 static const struct attribute_group ad799x_event_attrs_group = {
 540         .attrs = ad799x_event_attributes,
 541 };
 542
 543 static const struct iio_info ad7991_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_noirq_info = {
 549         .read_raw = &ad799x_read_raw,
 550         .update_scan_mode = ad799x_update_scan_mode,
 551 };
 552
 553 static const struct iio_info ad7993_4_7_8_irq_info = {
 554         .read_raw = &ad799x_read_raw,
 555         .event_attrs = &ad799x_event_attrs_group,
 556         .read_event_config = &ad799x_read_event_config,
 557         .write_event_config = &ad799x_write_event_config,
 558         .read_event_value = &ad799x_read_event_value,
 559         .write_event_value = &ad799x_write_event_value,
 560         .update_scan_mode = ad799x_update_scan_mode,
 561 };
 562
 563 static const struct iio_event_spec ad799x_events[] = {
 564         {
 565                 .type = IIO_EV_TYPE_THRESH,
 566                 .dir = IIO_EV_DIR_RISING,
 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_FALLING,
 572                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 573                         BIT(IIO_EV_INFO_ENABLE),
 574         }, {
 575                 .type = IIO_EV_TYPE_THRESH,
 576                 .dir = IIO_EV_DIR_EITHER,
 577                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 578         },
 579 };
 580
 581 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 582         .type = IIO_VOLTAGE, \
 583         .indexed = 1, \
 584         .channel = (_index), \
 585         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 586         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 587         .scan_index = (_index), \
 588         .scan_type = { \
 589                 .sign = 'u', \
 590                 .realbits = (_realbits), \
 591                 .storagebits = 16, \
 592                 .shift = 12 - (_realbits), \
 593                 .endianness = IIO_BE, \
 594         }, \
 595         .event_spec = _ev_spec, \
 596         .num_event_specs = _num_ev_spec, \
 597 }
 598
 599 #define AD799X_CHANNEL(_index, _realbits) \
 600         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 601
 602 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 603         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 604                 ARRAY_SIZE(ad799x_events))
 605
 606 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 607         [ad7991] = {
 608                 .num_channels = 5,
 609                 .noirq_config = {
 610                         .channel = {
 611                                 AD799X_CHANNEL(0, 12),
 612                                 AD799X_CHANNEL(1, 12),
 613                                 AD799X_CHANNEL(2, 12),
 614                                 AD799X_CHANNEL(3, 12),
 615                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 616                         },
 617                         .info = &ad7991_info,
 618                 },
 619         },
 620         [ad7995] = {
 621                 .num_channels = 5,
 622                 .noirq_config = {
 623                         .channel = {
 624                                 AD799X_CHANNEL(0, 10),
 625                                 AD799X_CHANNEL(1, 10),
 626                                 AD799X_CHANNEL(2, 10),
 627                                 AD799X_CHANNEL(3, 10),
 628                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 629                         },
 630                         .info = &ad7991_info,
 631                 },
 632         },
 633         [ad7999] = {
 634                 .num_channels = 5,
 635                 .noirq_config = {
 636                         .channel = {
 637                                 AD799X_CHANNEL(0, 8),
 638                                 AD799X_CHANNEL(1, 8),
 639                                 AD799X_CHANNEL(2, 8),
 640                                 AD799X_CHANNEL(3, 8),
 641                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 642                         },
 643                         .info = &ad7991_info,
 644                 },
 645         },
 646         [ad7992] = {
 647                 .num_channels = 3,
 648                 .noirq_config = {
 649                         .channel = {
 650                                 AD799X_CHANNEL(0, 12),
 651                                 AD799X_CHANNEL(1, 12),
 652                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 653                         },
 654                         .info = &ad7993_4_7_8_noirq_info,
 655                 },
 656                 .irq_config = {
 657                         .channel = {
 658                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 659                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 660                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 661                         },
 662                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 663                         .info = &ad7993_4_7_8_irq_info,
 664                 },
 665         },
 666         [ad7993] = {
 667                 .num_channels = 5,
 668                 .noirq_config = {
 669                         .channel = {
 670                                 AD799X_CHANNEL(0, 10),
 671                                 AD799X_CHANNEL(1, 10),
 672                                 AD799X_CHANNEL(2, 10),
 673                                 AD799X_CHANNEL(3, 10),
 674                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 675                         },
 676                         .info = &ad7993_4_7_8_noirq_info,
 677                 },
 678                 .irq_config = {
 679                         .channel = {
 680                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 681                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 682                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 683                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 684                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 685                         },
 686                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 687                         .info = &ad7993_4_7_8_irq_info,
 688                 },
 689         },
 690         [ad7994] = {
 691                 .num_channels = 5,
 692                 .noirq_config = {
 693                         .channel = {
 694                                 AD799X_CHANNEL(0, 12),
 695                                 AD799X_CHANNEL(1, 12),
 696                                 AD799X_CHANNEL(2, 12),
 697                                 AD799X_CHANNEL(3, 12),
 698                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 699                         },
 700                         .info = &ad7993_4_7_8_noirq_info,
 701                 },
 702                 .irq_config = {
 703                         .channel = {
 704                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 705                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 706                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 707                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 708                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 709                         },
 710                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 711                         .info = &ad7993_4_7_8_irq_info,
 712                 },
 713         },
 714         [ad7997] = {
 715                 .num_channels = 9,
 716                 .noirq_config = {
 717                         .channel = {
 718                                 AD799X_CHANNEL(0, 10),
 719                                 AD799X_CHANNEL(1, 10),
 720                                 AD799X_CHANNEL(2, 10),
 721                                 AD799X_CHANNEL(3, 10),
 722                                 AD799X_CHANNEL(4, 10),
 723                                 AD799X_CHANNEL(5, 10),
 724                                 AD799X_CHANNEL(6, 10),
 725                                 AD799X_CHANNEL(7, 10),
 726                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 727                         },
 728                         .info = &ad7993_4_7_8_noirq_info,
 729                 },
 730                 .irq_config = {
 731                         .channel = {
 732                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 733                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 734                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 735                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 736                                 AD799X_CHANNEL(4, 10),
 737                                 AD799X_CHANNEL(5, 10),
 738                                 AD799X_CHANNEL(6, 10),
 739                                 AD799X_CHANNEL(7, 10),
 740                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 741                         },
 742                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 743                         .info = &ad7993_4_7_8_irq_info,
 744                 },
 745         },
 746         [ad7998] = {
 747                 .num_channels = 9,
 748                 .noirq_config = {
 749                         .channel = {
 750                                 AD799X_CHANNEL(0, 12),
 751                                 AD799X_CHANNEL(1, 12),
 752                                 AD799X_CHANNEL(2, 12),
 753                                 AD799X_CHANNEL(3, 12),
 754                                 AD799X_CHANNEL(4, 12),
 755                                 AD799X_CHANNEL(5, 12),
 756                                 AD799X_CHANNEL(6, 12),
 757                                 AD799X_CHANNEL(7, 12),
 758                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 759                         },
 760                         .info = &ad7993_4_7_8_noirq_info,
 761                 },
 762                 .irq_config = {
 763                         .channel = {
 764                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 765                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 766                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 767                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 768                                 AD799X_CHANNEL(4, 12),
 769                                 AD799X_CHANNEL(5, 12),
 770                                 AD799X_CHANNEL(6, 12),
 771                                 AD799X_CHANNEL(7, 12),
 772                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 773                         },
 774                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 775                         .info = &ad7993_4_7_8_irq_info,
 776                 },
 777         },
 778 };
 779
 780 static int ad799x_probe(struct i2c_client *client)
 781 {
 782         const struct i2c_device_id *id = i2c_client_get_device_id(client);
 783         int ret;
 784         int extra_config = 0;
 785         struct ad799x_state *st;
 786         struct iio_dev *indio_dev;
 787         const struct ad799x_chip_info *chip_info =
 788                 &ad799x_chip_info_tbl[id->driver_data];
 789
 790         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 791         if (indio_dev == NULL)
 792                 return -ENOMEM;
 793
 794         st = iio_priv(indio_dev);
 795         /* this is only used for device removal purposes */
 796         i2c_set_clientdata(client, indio_dev);
 797
 798         st->id = id->driver_data;
 799         if (client->irq > 0 && chip_info->irq_config.info)
 800                 st->chip_config = &chip_info->irq_config;
 801         else
 802                 st->chip_config = &chip_info->noirq_config;
 803
 804         /* TODO: Add pdata options for filtering and bit delay */
 805
 806         st->reg = devm_regulator_get(&client->dev, "vcc");
 807         if (IS_ERR(st->reg))
 808                 return PTR_ERR(st->reg);
 809         ret = regulator_enable(st->reg);
 810         if (ret)
 811                 return ret;
 812
 813         /* check if an external reference is supplied */
 814         st->vref = devm_regulator_get_optional(&client->dev, "vref");
 815
 816         if (IS_ERR(st->vref)) {
 817                 if (PTR_ERR(st->vref) == -ENODEV) {
 818                         st->vref = NULL;
 819                         dev_info(&client->dev, "Using VCC reference voltage\n");
 820                 } else {
 821                         ret = PTR_ERR(st->vref);
 822                         goto error_disable_reg;
 823                 }
 824         }
 825
 826         if (st->vref) {
 827                 /*
 828                  * Use external reference voltage if supported by hardware.
 829                  * This is optional if voltage / regulator present, use VCC otherwise.
 830                  */
 831                 if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
 832                         dev_info(&client->dev, "Using external reference voltage\n");
 833                         extra_config |= AD7991_REF_SEL;
 834                         ret = regulator_enable(st->vref);
 835                         if (ret)
 836                                 goto error_disable_reg;
 837                 } else {
 838                         st->vref = NULL;
 839                         dev_warn(&client->dev, "Supplied reference not supported\n");
 840                 }
 841         }
 842
 843         st->client = client;
 844
 845         indio_dev->name = id->name;
 846         indio_dev->info = st->chip_config->info;
 847
 848         indio_dev->modes = INDIO_DIRECT_MODE;
 849         indio_dev->channels = st->chip_config->channel;
 850         indio_dev->num_channels = chip_info->num_channels;
 851
 852         ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
 853         if (ret)
 854                 goto error_disable_vref;
 855
 856         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 857                 &ad799x_trigger_handler, NULL);
 858         if (ret)
 859                 goto error_disable_vref;
 860
 861         if (client->irq > 0) {
 862                 ret = devm_request_threaded_irq(&client->dev,
 863                                                 client->irq,
 864                                                 NULL,
 865                                                 ad799x_event_handler,
 866                                                 IRQF_TRIGGER_FALLING |
 867                                                 IRQF_ONESHOT,
 868                                                 client->name,
 869                                                 indio_dev);
 870                 if (ret)
 871                         goto error_cleanup_ring;
 872         }
 873
 874         mutex_init(&st->lock);
 875
 876         ret = iio_device_register(indio_dev);
 877         if (ret)
 878                 goto error_cleanup_ring;
 879
 880         return 0;
 881
 882 error_cleanup_ring:
 883         iio_triggered_buffer_cleanup(indio_dev);
 884 error_disable_vref:
 885         if (st->vref)
 886                 regulator_disable(st->vref);
 887 error_disable_reg:
 888         regulator_disable(st->reg);
 889
 890         return ret;
 891 }
 892
 893 static void ad799x_remove(struct i2c_client *client)
 894 {
 895         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 896         struct ad799x_state *st = iio_priv(indio_dev);
 897
 898         iio_device_unregister(indio_dev);
 899
 900         iio_triggered_buffer_cleanup(indio_dev);
 901         if (st->vref)
 902                 regulator_disable(st->vref);
 903         regulator_disable(st->reg);
 904         kfree(st->rx_buf);
 905 }
 906
 907 static int ad799x_suspend(struct device *dev)
 908 {
 909         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 910         struct ad799x_state *st = iio_priv(indio_dev);
 911
 912         if (st->vref)
 913                 regulator_disable(st->vref);
 914         regulator_disable(st->reg);
 915
 916         return 0;
 917 }
 918
 919 static int ad799x_resume(struct device *dev)
 920 {
 921         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 922         struct ad799x_state *st = iio_priv(indio_dev);
 923         int ret;
 924
 925         ret = regulator_enable(st->reg);
 926         if (ret) {
 927                 dev_err(dev, "Unable to enable vcc regulator\n");
 928                 return ret;
 929         }
 930
 931         if (st->vref) {
 932                 ret = regulator_enable(st->vref);
 933                 if (ret) {
 934                         regulator_disable(st->reg);
 935                         dev_err(dev, "Unable to enable vref regulator\n");
 936                         return ret;
 937                 }
 938         }
 939
 940         /* resync config */
 941         ret = ad799x_update_config(st, st->config);
 942         if (ret) {
 943                 if (st->vref)
 944                         regulator_disable(st->vref);
 945                 regulator_disable(st->reg);
 946                 return ret;
 947         }
 948
 949         return 0;
 950 }
 951
 952 static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
 953
 954 static const struct i2c_device_id ad799x_id[] = {
 955         { "ad7991", ad7991 },
 956         { "ad7995", ad7995 },
 957         { "ad7999", ad7999 },
 958         { "ad7992", ad7992 },
 959         { "ad7993", ad7993 },
 960         { "ad7994", ad7994 },
 961         { "ad7997", ad7997 },
 962         { "ad7998", ad7998 },
 963         {}
 964 };
 965
 966 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 967
 968 static struct i2c_driver ad799x_driver = {
 969         .driver = {
 970                 .name = "ad799x",
 971                 .pm = pm_sleep_ptr(&ad799x_pm_ops),
 972         },
 973         .probe = ad799x_probe,
 974         .remove = ad799x_remove,
 975         .id_table = ad799x_id,
 976 };
 977 module_i2c_driver(ad799x_driver);
 978
 979 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 980 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 981 MODULE_LICENSE("GPL v2");