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                        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, indio_dev->masklength) * 2;
 241
 242         switch (st->id) {
 243         case ad7992:
 244         case ad7993:
 245         case ad7994:
 246         case ad7997:
 247         case ad7998:
 248                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 249                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 250                 return ad799x_write_config(st, st->config);
 251         default:
 252                 return 0;
 253         }
 254 }
 255
 256 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 257 {
 258         u8 cmd;
 259
 260         switch (st->id) {
 261         case ad7991:
 262         case ad7995:
 263         case ad7999:
 264                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 265                 break;
 266         case ad7992:
 267         case ad7993:
 268         case ad7994:
 269                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 270                 break;
 271         case ad7997:
 272         case ad7998:
 273                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 274                 break;
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         return i2c_smbus_read_word_swapped(st->client, cmd);
 280 }
 281
 282 static int ad799x_read_raw(struct iio_dev *indio_dev,
 283                            struct iio_chan_spec const *chan,
 284                            int *val,
 285                            int *val2,
 286                            long m)
 287 {
 288         int ret;
 289         struct ad799x_state *st = iio_priv(indio_dev);
 290
 291         switch (m) {
 292         case IIO_CHAN_INFO_RAW:
 293                 ret = iio_device_claim_direct_mode(indio_dev);
 294                 if (ret)
 295                         return ret;
 296                 mutex_lock(&st->lock);
 297                 ret = ad799x_scan_direct(st, chan->scan_index);
 298                 mutex_unlock(&st->lock);
 299                 iio_device_release_direct_mode(indio_dev);
 300
 301                 if (ret < 0)
 302                         return ret;
 303                 *val = (ret >> chan->scan_type.shift) &
 304                         GENMASK(chan->scan_type.realbits - 1, 0);
 305                 return IIO_VAL_INT;
 306         case IIO_CHAN_INFO_SCALE:
 307                 if (st->vref)
 308                         ret = regulator_get_voltage(st->vref);
 309                 else
 310                         ret = regulator_get_voltage(st->reg);
 311
 312                 if (ret < 0)
 313                         return ret;
 314                 *val = ret / 1000;
 315                 *val2 = chan->scan_type.realbits;
 316                 return IIO_VAL_FRACTIONAL_LOG2;
 317         }
 318         return -EINVAL;
 319 }
 320 static const unsigned int ad7998_frequencies[] = {
 321         [AD7998_CYC_DIS]        = 0,
 322         [AD7998_CYC_TCONF_32]   = 15625,
 323         [AD7998_CYC_TCONF_64]   = 7812,
 324         [AD7998_CYC_TCONF_128]  = 3906,
 325         [AD7998_CYC_TCONF_512]  = 976,
 326         [AD7998_CYC_TCONF_1024] = 488,
 327         [AD7998_CYC_TCONF_2048] = 244,
 328 };
 329
 330 static ssize_t ad799x_read_frequency(struct device *dev,
 331                                         struct device_attribute *attr,
 332                                         char *buf)
 333 {
 334         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 335         struct ad799x_state *st = iio_priv(indio_dev);
 336
 337         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 338         if (ret < 0)
 339                 return ret;
 340
 341         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 342 }
 343
 344 static ssize_t ad799x_write_frequency(struct device *dev,
 345                                          struct device_attribute *attr,
 346                                          const char *buf,
 347                                          size_t len)
 348 {
 349         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 350         struct ad799x_state *st = iio_priv(indio_dev);
 351
 352         long val;
 353         int ret, i;
 354
 355         ret = kstrtol(buf, 10, &val);
 356         if (ret)
 357                 return ret;
 358
 359         mutex_lock(&st->lock);
 360
 361         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 362         if (ret < 0)
 363                 goto error_ret_mutex;
 364         /* Wipe the bits clean */
 365         ret &= ~AD7998_CYC_MASK;
 366
 367         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 368                 if (val == ad7998_frequencies[i])
 369                         break;
 370         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 371                 ret = -EINVAL;
 372                 goto error_ret_mutex;
 373         }
 374
 375         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 376                 ret | i);
 377         if (ret < 0)
 378                 goto error_ret_mutex;
 379         ret = len;
 380
 381 error_ret_mutex:
 382         mutex_unlock(&st->lock);
 383
 384         return ret;
 385 }
 386
 387 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 388                                     const struct iio_chan_spec *chan,
 389                                     enum iio_event_type type,
 390                                     enum iio_event_direction dir)
 391 {
 392         struct ad799x_state *st = iio_priv(indio_dev);
 393
 394         if (!(st->config & AD7998_ALERT_EN))
 395                 return 0;
 396
 397         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 398                 return 1;
 399
 400         return 0;
 401 }
 402
 403 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 404                                      const struct iio_chan_spec *chan,
 405                                      enum iio_event_type type,
 406                                      enum iio_event_direction dir,
 407                                      int state)
 408 {
 409         struct ad799x_state *st = iio_priv(indio_dev);
 410         int ret;
 411
 412         ret = iio_device_claim_direct_mode(indio_dev);
 413         if (ret)
 414                 return ret;
 415
 416         mutex_lock(&st->lock);
 417
 418         if (state)
 419                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 420         else
 421                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 422
 423         if (st->config >> AD799X_CHANNEL_SHIFT)
 424                 st->config |= AD7998_ALERT_EN;
 425         else
 426                 st->config &= ~AD7998_ALERT_EN;
 427
 428         ret = ad799x_write_config(st, st->config);
 429         mutex_unlock(&st->lock);
 430         iio_device_release_direct_mode(indio_dev);
 431         return ret;
 432 }
 433
 434 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 435                                          enum iio_event_direction dir,
 436                                          enum iio_event_info info)
 437 {
 438         switch (info) {
 439         case IIO_EV_INFO_VALUE:
 440                 if (dir == IIO_EV_DIR_FALLING)
 441                         return AD7998_DATALOW_REG(chan->channel);
 442                 else
 443                         return AD7998_DATAHIGH_REG(chan->channel);
 444         case IIO_EV_INFO_HYSTERESIS:
 445                 return AD7998_HYST_REG(chan->channel);
 446         default:
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 454                                     const struct iio_chan_spec *chan,
 455                                     enum iio_event_type type,
 456                                     enum iio_event_direction dir,
 457                                     enum iio_event_info info,
 458                                     int val, int val2)
 459 {
 460         int ret;
 461         struct ad799x_state *st = iio_priv(indio_dev);
 462
 463         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 464                 return -EINVAL;
 465
 466         ret = i2c_smbus_write_word_swapped(st->client,
 467                 ad799x_threshold_reg(chan, dir, info),
 468                 val << chan->scan_type.shift);
 469
 470         return ret;
 471 }
 472
 473 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 474                                     const struct iio_chan_spec *chan,
 475                                     enum iio_event_type type,
 476                                     enum iio_event_direction dir,
 477                                     enum iio_event_info info,
 478                                     int *val, int *val2)
 479 {
 480         int ret;
 481         struct ad799x_state *st = iio_priv(indio_dev);
 482
 483         ret = i2c_smbus_read_word_swapped(st->client,
 484                 ad799x_threshold_reg(chan, dir, info));
 485         if (ret < 0)
 486                 return ret;
 487         *val = (ret >> chan->scan_type.shift) &
 488                 GENMASK(chan->scan_type.realbits - 1, 0);
 489
 490         return IIO_VAL_INT;
 491 }
 492
 493 static irqreturn_t ad799x_event_handler(int irq, void *private)
 494 {
 495         struct iio_dev *indio_dev = private;
 496         struct ad799x_state *st = iio_priv(private);
 497         int i, ret;
 498
 499         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 500         if (ret <= 0)
 501                 goto done;
 502
 503         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 504                 AD7998_ALERT_STAT_CLEAR) < 0)
 505                 goto done;
 506
 507         for (i = 0; i < 8; i++) {
 508                 if (ret & BIT(i))
 509                         iio_push_event(indio_dev,
 510                                        i & 0x1 ?
 511                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 512                                                             (i >> 1),
 513                                                             IIO_EV_TYPE_THRESH,
 514                                                             IIO_EV_DIR_RISING) :
 515                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 516                                                             (i >> 1),
 517                                                             IIO_EV_TYPE_THRESH,
 518                                                             IIO_EV_DIR_FALLING),
 519                                        iio_get_time_ns(indio_dev));
 520         }
 521
 522 done:
 523         return IRQ_HANDLED;
 524 }
 525
 526 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 527                               ad799x_read_frequency,
 528                               ad799x_write_frequency);
 529 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 530
 531 static struct attribute *ad799x_event_attributes[] = {
 532         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 533         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 534         NULL,
 535 };
 536
 537 static const struct attribute_group ad799x_event_attrs_group = {
 538         .attrs = ad799x_event_attributes,
 539 };
 540
 541 static const struct iio_info ad7991_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_noirq_info = {
 547         .read_raw = &ad799x_read_raw,
 548         .update_scan_mode = ad799x_update_scan_mode,
 549 };
 550
 551 static const struct iio_info ad7993_4_7_8_irq_info = {
 552         .read_raw = &ad799x_read_raw,
 553         .event_attrs = &ad799x_event_attrs_group,
 554         .read_event_config = &ad799x_read_event_config,
 555         .write_event_config = &ad799x_write_event_config,
 556         .read_event_value = &ad799x_read_event_value,
 557         .write_event_value = &ad799x_write_event_value,
 558         .update_scan_mode = ad799x_update_scan_mode,
 559 };
 560
 561 static const struct iio_event_spec ad799x_events[] = {
 562         {
 563                 .type = IIO_EV_TYPE_THRESH,
 564                 .dir = IIO_EV_DIR_RISING,
 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_FALLING,
 570                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 571                         BIT(IIO_EV_INFO_ENABLE),
 572         }, {
 573                 .type = IIO_EV_TYPE_THRESH,
 574                 .dir = IIO_EV_DIR_EITHER,
 575                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 576         },
 577 };
 578
 579 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 580         .type = IIO_VOLTAGE, \
 581         .indexed = 1, \
 582         .channel = (_index), \
 583         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 584         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 585         .scan_index = (_index), \
 586         .scan_type = { \
 587                 .sign = 'u', \
 588                 .realbits = (_realbits), \
 589                 .storagebits = 16, \
 590                 .shift = 12 - (_realbits), \
 591                 .endianness = IIO_BE, \
 592         }, \
 593         .event_spec = _ev_spec, \
 594         .num_event_specs = _num_ev_spec, \
 595 }
 596
 597 #define AD799X_CHANNEL(_index, _realbits) \
 598         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 599
 600 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 601         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 602                 ARRAY_SIZE(ad799x_events))
 603
 604 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 605         [ad7991] = {
 606                 .num_channels = 5,
 607                 .noirq_config = {
 608                         .channel = {
 609                                 AD799X_CHANNEL(0, 12),
 610                                 AD799X_CHANNEL(1, 12),
 611                                 AD799X_CHANNEL(2, 12),
 612                                 AD799X_CHANNEL(3, 12),
 613                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 614                         },
 615                         .info = &ad7991_info,
 616                 },
 617         },
 618         [ad7995] = {
 619                 .num_channels = 5,
 620                 .noirq_config = {
 621                         .channel = {
 622                                 AD799X_CHANNEL(0, 10),
 623                                 AD799X_CHANNEL(1, 10),
 624                                 AD799X_CHANNEL(2, 10),
 625                                 AD799X_CHANNEL(3, 10),
 626                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 627                         },
 628                         .info = &ad7991_info,
 629                 },
 630         },
 631         [ad7999] = {
 632                 .num_channels = 5,
 633                 .noirq_config = {
 634                         .channel = {
 635                                 AD799X_CHANNEL(0, 8),
 636                                 AD799X_CHANNEL(1, 8),
 637                                 AD799X_CHANNEL(2, 8),
 638                                 AD799X_CHANNEL(3, 8),
 639                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 640                         },
 641                         .info = &ad7991_info,
 642                 },
 643         },
 644         [ad7992] = {
 645                 .num_channels = 3,
 646                 .noirq_config = {
 647                         .channel = {
 648                                 AD799X_CHANNEL(0, 12),
 649                                 AD799X_CHANNEL(1, 12),
 650                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 651                         },
 652                         .info = &ad7993_4_7_8_noirq_info,
 653                 },
 654                 .irq_config = {
 655                         .channel = {
 656                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 657                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 658                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 659                         },
 660                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 661                         .info = &ad7993_4_7_8_irq_info,
 662                 },
 663         },
 664         [ad7993] = {
 665                 .num_channels = 5,
 666                 .noirq_config = {
 667                         .channel = {
 668                                 AD799X_CHANNEL(0, 10),
 669                                 AD799X_CHANNEL(1, 10),
 670                                 AD799X_CHANNEL(2, 10),
 671                                 AD799X_CHANNEL(3, 10),
 672                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 673                         },
 674                         .info = &ad7993_4_7_8_noirq_info,
 675                 },
 676                 .irq_config = {
 677                         .channel = {
 678                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 679                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 680                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 681                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 682                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 683                         },
 684                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 685                         .info = &ad7993_4_7_8_irq_info,
 686                 },
 687         },
 688         [ad7994] = {
 689                 .num_channels = 5,
 690                 .noirq_config = {
 691                         .channel = {
 692                                 AD799X_CHANNEL(0, 12),
 693                                 AD799X_CHANNEL(1, 12),
 694                                 AD799X_CHANNEL(2, 12),
 695                                 AD799X_CHANNEL(3, 12),
 696                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 697                         },
 698                         .info = &ad7993_4_7_8_noirq_info,
 699                 },
 700                 .irq_config = {
 701                         .channel = {
 702                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 703                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 704                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 705                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 706                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 707                         },
 708                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 709                         .info = &ad7993_4_7_8_irq_info,
 710                 },
 711         },
 712         [ad7997] = {
 713                 .num_channels = 9,
 714                 .noirq_config = {
 715                         .channel = {
 716                                 AD799X_CHANNEL(0, 10),
 717                                 AD799X_CHANNEL(1, 10),
 718                                 AD799X_CHANNEL(2, 10),
 719                                 AD799X_CHANNEL(3, 10),
 720                                 AD799X_CHANNEL(4, 10),
 721                                 AD799X_CHANNEL(5, 10),
 722                                 AD799X_CHANNEL(6, 10),
 723                                 AD799X_CHANNEL(7, 10),
 724                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 725                         },
 726                         .info = &ad7993_4_7_8_noirq_info,
 727                 },
 728                 .irq_config = {
 729                         .channel = {
 730                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 731                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 732                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 733                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 734                                 AD799X_CHANNEL(4, 10),
 735                                 AD799X_CHANNEL(5, 10),
 736                                 AD799X_CHANNEL(6, 10),
 737                                 AD799X_CHANNEL(7, 10),
 738                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 739                         },
 740                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 741                         .info = &ad7993_4_7_8_irq_info,
 742                 },
 743         },
 744         [ad7998] = {
 745                 .num_channels = 9,
 746                 .noirq_config = {
 747                         .channel = {
 748                                 AD799X_CHANNEL(0, 12),
 749                                 AD799X_CHANNEL(1, 12),
 750                                 AD799X_CHANNEL(2, 12),
 751                                 AD799X_CHANNEL(3, 12),
 752                                 AD799X_CHANNEL(4, 12),
 753                                 AD799X_CHANNEL(5, 12),
 754                                 AD799X_CHANNEL(6, 12),
 755                                 AD799X_CHANNEL(7, 12),
 756                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 757                         },
 758                         .info = &ad7993_4_7_8_noirq_info,
 759                 },
 760                 .irq_config = {
 761                         .channel = {
 762                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 763                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 764                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 765                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 766                                 AD799X_CHANNEL(4, 12),
 767                                 AD799X_CHANNEL(5, 12),
 768                                 AD799X_CHANNEL(6, 12),
 769                                 AD799X_CHANNEL(7, 12),
 770                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 771                         },
 772                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 773                         .info = &ad7993_4_7_8_irq_info,
 774                 },
 775         },
 776 };
 777
 778 static int ad799x_probe(struct i2c_client *client)
 779 {
 780         const struct i2c_device_id *id = i2c_client_get_device_id(client);
 781         int ret;
 782         int extra_config = 0;
 783         struct ad799x_state *st;
 784         struct iio_dev *indio_dev;
 785         const struct ad799x_chip_info *chip_info =
 786                 &ad799x_chip_info_tbl[id->driver_data];
 787
 788         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 789         if (indio_dev == NULL)
 790                 return -ENOMEM;
 791
 792         st = iio_priv(indio_dev);
 793         /* this is only used for device removal purposes */
 794         i2c_set_clientdata(client, indio_dev);
 795
 796         st->id = id->driver_data;
 797         if (client->irq > 0 && chip_info->irq_config.info)
 798                 st->chip_config = &chip_info->irq_config;
 799         else
 800                 st->chip_config = &chip_info->noirq_config;
 801
 802         /* TODO: Add pdata options for filtering and bit delay */
 803
 804         st->reg = devm_regulator_get(&client->dev, "vcc");
 805         if (IS_ERR(st->reg))
 806                 return PTR_ERR(st->reg);
 807         ret = regulator_enable(st->reg);
 808         if (ret)
 809                 return ret;
 810
 811         /* check if an external reference is supplied */
 812         st->vref = devm_regulator_get_optional(&client->dev, "vref");
 813
 814         if (IS_ERR(st->vref)) {
 815                 if (PTR_ERR(st->vref) == -ENODEV) {
 816                         st->vref = NULL;
 817                         dev_info(&client->dev, "Using VCC reference voltage\n");
 818                 } else {
 819                         ret = PTR_ERR(st->vref);
 820                         goto error_disable_reg;
 821                 }
 822         }
 823
 824         if (st->vref) {
 825                 /*
 826                  * Use external reference voltage if supported by hardware.
 827                  * This is optional if voltage / regulator present, use VCC otherwise.
 828                  */
 829                 if ((st->id == ad7991) || (st->id == ad7995) || (st->id == ad7999)) {
 830                         dev_info(&client->dev, "Using external reference voltage\n");
 831                         extra_config |= AD7991_REF_SEL;
 832                         ret = regulator_enable(st->vref);
 833                         if (ret)
 834                                 goto error_disable_reg;
 835                 } else {
 836                         st->vref = NULL;
 837                         dev_warn(&client->dev, "Supplied reference not supported\n");
 838                 }
 839         }
 840
 841         st->client = client;
 842
 843         indio_dev->name = id->name;
 844         indio_dev->info = st->chip_config->info;
 845
 846         indio_dev->modes = INDIO_DIRECT_MODE;
 847         indio_dev->channels = st->chip_config->channel;
 848         indio_dev->num_channels = chip_info->num_channels;
 849
 850         ret = ad799x_update_config(st, st->chip_config->default_config | extra_config);
 851         if (ret)
 852                 goto error_disable_vref;
 853
 854         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 855                 &ad799x_trigger_handler, NULL);
 856         if (ret)
 857                 goto error_disable_vref;
 858
 859         if (client->irq > 0) {
 860                 ret = devm_request_threaded_irq(&client->dev,
 861                                                 client->irq,
 862                                                 NULL,
 863                                                 ad799x_event_handler,
 864                                                 IRQF_TRIGGER_FALLING |
 865                                                 IRQF_ONESHOT,
 866                                                 client->name,
 867                                                 indio_dev);
 868                 if (ret)
 869                         goto error_cleanup_ring;
 870         }
 871
 872         mutex_init(&st->lock);
 873
 874         ret = iio_device_register(indio_dev);
 875         if (ret)
 876                 goto error_cleanup_ring;
 877
 878         return 0;
 879
 880 error_cleanup_ring:
 881         iio_triggered_buffer_cleanup(indio_dev);
 882 error_disable_vref:
 883         if (st->vref)
 884                 regulator_disable(st->vref);
 885 error_disable_reg:
 886         regulator_disable(st->reg);
 887
 888         return ret;
 889 }
 890
 891 static void ad799x_remove(struct i2c_client *client)
 892 {
 893         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 894         struct ad799x_state *st = iio_priv(indio_dev);
 895
 896         iio_device_unregister(indio_dev);
 897
 898         iio_triggered_buffer_cleanup(indio_dev);
 899         if (st->vref)
 900                 regulator_disable(st->vref);
 901         regulator_disable(st->reg);
 902         kfree(st->rx_buf);
 903 }
 904
 905 static int ad799x_suspend(struct device *dev)
 906 {
 907         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 908         struct ad799x_state *st = iio_priv(indio_dev);
 909
 910         if (st->vref)
 911                 regulator_disable(st->vref);
 912         regulator_disable(st->reg);
 913
 914         return 0;
 915 }
 916
 917 static int ad799x_resume(struct device *dev)
 918 {
 919         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 920         struct ad799x_state *st = iio_priv(indio_dev);
 921         int ret;
 922
 923         ret = regulator_enable(st->reg);
 924         if (ret) {
 925                 dev_err(dev, "Unable to enable vcc regulator\n");
 926                 return ret;
 927         }
 928
 929         if (st->vref) {
 930                 ret = regulator_enable(st->vref);
 931                 if (ret) {
 932                         regulator_disable(st->reg);
 933                         dev_err(dev, "Unable to enable vref regulator\n");
 934                         return ret;
 935                 }
 936         }
 937
 938         /* resync config */
 939         ret = ad799x_update_config(st, st->config);
 940         if (ret) {
 941                 if (st->vref)
 942                         regulator_disable(st->vref);
 943                 regulator_disable(st->reg);
 944                 return ret;
 945         }
 946
 947         return 0;
 948 }
 949
 950 static DEFINE_SIMPLE_DEV_PM_OPS(ad799x_pm_ops, ad799x_suspend, ad799x_resume);
 951
 952 static const struct i2c_device_id ad799x_id[] = {
 953         { "ad7991", ad7991 },
 954         { "ad7995", ad7995 },
 955         { "ad7999", ad7999 },
 956         { "ad7992", ad7992 },
 957         { "ad7993", ad7993 },
 958         { "ad7994", ad7994 },
 959         { "ad7997", ad7997 },
 960         { "ad7998", ad7998 },
 961         {}
 962 };
 963
 964 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 965
 966 static struct i2c_driver ad799x_driver = {
 967         .driver = {
 968                 .name = "ad799x",
 969                 .pm = pm_sleep_ptr(&ad799x_pm_ops),
 970         },
 971         .probe = ad799x_probe,
 972         .remove = ad799x_remove,
 973         .id_table = ad799x_id,
 974 };
 975 module_i2c_driver(ad799x_driver);
 976
 977 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 978 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 979 MODULE_LICENSE("GPL v2");