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 /**
 171  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 172  *
 173  * Currently there is no option in this driver to disable the saving of
 174  * timestamps within the ring.
 175  **/
 176 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 177 {
 178         struct iio_poll_func *pf = p;
 179         struct iio_dev *indio_dev = pf->indio_dev;
 180         struct ad799x_state *st = iio_priv(indio_dev);
 181         int b_sent;
 182         u8 cmd;
 183
 184         switch (st->id) {
 185         case ad7991:
 186         case ad7995:
 187         case ad7999:
 188                 cmd = st->config |
 189                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 190                 break;
 191         case ad7992:
 192         case ad7993:
 193         case ad7994:
 194                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 195                         AD7998_CONV_RES_REG;
 196                 break;
 197         case ad7997:
 198         case ad7998:
 199                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 200                 break;
 201         default:
 202                 cmd = 0;
 203         }
 204
 205         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 206                         cmd, st->transfer_size, st->rx_buf);
 207         if (b_sent < 0)
 208                 goto out;
 209
 210         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 211                         iio_get_time_ns(indio_dev));
 212 out:
 213         iio_trigger_notify_done(indio_dev->trig);
 214
 215         return IRQ_HANDLED;
 216 }
 217
 218 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 219         const unsigned long *scan_mask)
 220 {
 221         struct ad799x_state *st = iio_priv(indio_dev);
 222
 223         kfree(st->rx_buf);
 224         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 225         if (!st->rx_buf)
 226                 return -ENOMEM;
 227
 228         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 229
 230         switch (st->id) {
 231         case ad7992:
 232         case ad7993:
 233         case ad7994:
 234         case ad7997:
 235         case ad7998:
 236                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 237                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 238                 return ad799x_write_config(st, st->config);
 239         default:
 240                 return 0;
 241         }
 242 }
 243
 244 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 245 {
 246         u8 cmd;
 247
 248         switch (st->id) {
 249         case ad7991:
 250         case ad7995:
 251         case ad7999:
 252                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 253                 break;
 254         case ad7992:
 255         case ad7993:
 256         case ad7994:
 257                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 258                 break;
 259         case ad7997:
 260         case ad7998:
 261                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 262                 break;
 263         default:
 264                 return -EINVAL;
 265         }
 266
 267         return i2c_smbus_read_word_swapped(st->client, cmd);
 268 }
 269
 270 static int ad799x_read_raw(struct iio_dev *indio_dev,
 271                            struct iio_chan_spec const *chan,
 272                            int *val,
 273                            int *val2,
 274                            long m)
 275 {
 276         int ret;
 277         struct ad799x_state *st = iio_priv(indio_dev);
 278
 279         switch (m) {
 280         case IIO_CHAN_INFO_RAW:
 281                 ret = iio_device_claim_direct_mode(indio_dev);
 282                 if (ret)
 283                         return ret;
 284                 ret = ad799x_scan_direct(st, chan->scan_index);
 285                 iio_device_release_direct_mode(indio_dev);
 286
 287                 if (ret < 0)
 288                         return ret;
 289                 *val = (ret >> chan->scan_type.shift) &
 290                         GENMASK(chan->scan_type.realbits - 1, 0);
 291                 return IIO_VAL_INT;
 292         case IIO_CHAN_INFO_SCALE:
 293                 ret = regulator_get_voltage(st->vref);
 294                 if (ret < 0)
 295                         return ret;
 296                 *val = ret / 1000;
 297                 *val2 = chan->scan_type.realbits;
 298                 return IIO_VAL_FRACTIONAL_LOG2;
 299         }
 300         return -EINVAL;
 301 }
 302 static const unsigned int ad7998_frequencies[] = {
 303         [AD7998_CYC_DIS]        = 0,
 304         [AD7998_CYC_TCONF_32]   = 15625,
 305         [AD7998_CYC_TCONF_64]   = 7812,
 306         [AD7998_CYC_TCONF_128]  = 3906,
 307         [AD7998_CYC_TCONF_512]  = 976,
 308         [AD7998_CYC_TCONF_1024] = 488,
 309         [AD7998_CYC_TCONF_2048] = 244,
 310 };
 311
 312 static ssize_t ad799x_read_frequency(struct device *dev,
 313                                         struct device_attribute *attr,
 314                                         char *buf)
 315 {
 316         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 317         struct ad799x_state *st = iio_priv(indio_dev);
 318
 319         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 320         if (ret < 0)
 321                 return ret;
 322
 323         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 324 }
 325
 326 static ssize_t ad799x_write_frequency(struct device *dev,
 327                                          struct device_attribute *attr,
 328                                          const char *buf,
 329                                          size_t len)
 330 {
 331         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 332         struct ad799x_state *st = iio_priv(indio_dev);
 333
 334         long val;
 335         int ret, i;
 336
 337         ret = kstrtol(buf, 10, &val);
 338         if (ret)
 339                 return ret;
 340
 341         mutex_lock(&indio_dev->mlock);
 342         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 343         if (ret < 0)
 344                 goto error_ret_mutex;
 345         /* Wipe the bits clean */
 346         ret &= ~AD7998_CYC_MASK;
 347
 348         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 349                 if (val == ad7998_frequencies[i])
 350                         break;
 351         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 352                 ret = -EINVAL;
 353                 goto error_ret_mutex;
 354         }
 355
 356         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 357                 ret | i);
 358         if (ret < 0)
 359                 goto error_ret_mutex;
 360         ret = len;
 361
 362 error_ret_mutex:
 363         mutex_unlock(&indio_dev->mlock);
 364
 365         return ret;
 366 }
 367
 368 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 369                                     const struct iio_chan_spec *chan,
 370                                     enum iio_event_type type,
 371                                     enum iio_event_direction dir)
 372 {
 373         struct ad799x_state *st = iio_priv(indio_dev);
 374
 375         if (!(st->config & AD7998_ALERT_EN))
 376                 return 0;
 377
 378         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 379                 return 1;
 380
 381         return 0;
 382 }
 383
 384 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 385                                      const struct iio_chan_spec *chan,
 386                                      enum iio_event_type type,
 387                                      enum iio_event_direction dir,
 388                                      int state)
 389 {
 390         struct ad799x_state *st = iio_priv(indio_dev);
 391         int ret;
 392
 393         ret = iio_device_claim_direct_mode(indio_dev);
 394         if (ret)
 395                 return ret;
 396
 397         if (state)
 398                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 399         else
 400                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 401
 402         if (st->config >> AD799X_CHANNEL_SHIFT)
 403                 st->config |= AD7998_ALERT_EN;
 404         else
 405                 st->config &= ~AD7998_ALERT_EN;
 406
 407         ret = ad799x_write_config(st, st->config);
 408         iio_device_release_direct_mode(indio_dev);
 409         return ret;
 410 }
 411
 412 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 413                                          enum iio_event_direction dir,
 414                                          enum iio_event_info info)
 415 {
 416         switch (info) {
 417         case IIO_EV_INFO_VALUE:
 418                 if (dir == IIO_EV_DIR_FALLING)
 419                         return AD7998_DATALOW_REG(chan->channel);
 420                 else
 421                         return AD7998_DATAHIGH_REG(chan->channel);
 422         case IIO_EV_INFO_HYSTERESIS:
 423                 return AD7998_HYST_REG(chan->channel);
 424         default:
 425                 return -EINVAL;
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 432                                     const struct iio_chan_spec *chan,
 433                                     enum iio_event_type type,
 434                                     enum iio_event_direction dir,
 435                                     enum iio_event_info info,
 436                                     int val, int val2)
 437 {
 438         int ret;
 439         struct ad799x_state *st = iio_priv(indio_dev);
 440
 441         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 442                 return -EINVAL;
 443
 444         mutex_lock(&indio_dev->mlock);
 445         ret = i2c_smbus_write_word_swapped(st->client,
 446                 ad799x_threshold_reg(chan, dir, info),
 447                 val << chan->scan_type.shift);
 448         mutex_unlock(&indio_dev->mlock);
 449
 450         return ret;
 451 }
 452
 453 static int ad799x_read_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         mutex_lock(&indio_dev->mlock);
 464         ret = i2c_smbus_read_word_swapped(st->client,
 465                 ad799x_threshold_reg(chan, dir, info));
 466         mutex_unlock(&indio_dev->mlock);
 467         if (ret < 0)
 468                 return ret;
 469         *val = (ret >> chan->scan_type.shift) &
 470                 GENMASK(chan->scan_type.realbits - 1, 0);
 471
 472         return IIO_VAL_INT;
 473 }
 474
 475 static irqreturn_t ad799x_event_handler(int irq, void *private)
 476 {
 477         struct iio_dev *indio_dev = private;
 478         struct ad799x_state *st = iio_priv(private);
 479         int i, ret;
 480
 481         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 482         if (ret <= 0)
 483                 goto done;
 484
 485         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 486                 AD7998_ALERT_STAT_CLEAR) < 0)
 487                 goto done;
 488
 489         for (i = 0; i < 8; i++) {
 490                 if (ret & BIT(i))
 491                         iio_push_event(indio_dev,
 492                                        i & 0x1 ?
 493                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 494                                                             (i >> 1),
 495                                                             IIO_EV_TYPE_THRESH,
 496                                                             IIO_EV_DIR_RISING) :
 497                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 498                                                             (i >> 1),
 499                                                             IIO_EV_TYPE_THRESH,
 500                                                             IIO_EV_DIR_FALLING),
 501                                        iio_get_time_ns(indio_dev));
 502         }
 503
 504 done:
 505         return IRQ_HANDLED;
 506 }
 507
 508 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 509                               ad799x_read_frequency,
 510                               ad799x_write_frequency);
 511 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 512
 513 static struct attribute *ad799x_event_attributes[] = {
 514         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 515         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 516         NULL,
 517 };
 518
 519 static const struct attribute_group ad799x_event_attrs_group = {
 520         .attrs = ad799x_event_attributes,
 521 };
 522
 523 static const struct iio_info ad7991_info = {
 524         .read_raw = &ad799x_read_raw,
 525         .update_scan_mode = ad799x_update_scan_mode,
 526 };
 527
 528 static const struct iio_info ad7993_4_7_8_noirq_info = {
 529         .read_raw = &ad799x_read_raw,
 530         .update_scan_mode = ad799x_update_scan_mode,
 531 };
 532
 533 static const struct iio_info ad7993_4_7_8_irq_info = {
 534         .read_raw = &ad799x_read_raw,
 535         .event_attrs = &ad799x_event_attrs_group,
 536         .read_event_config = &ad799x_read_event_config,
 537         .write_event_config = &ad799x_write_event_config,
 538         .read_event_value = &ad799x_read_event_value,
 539         .write_event_value = &ad799x_write_event_value,
 540         .update_scan_mode = ad799x_update_scan_mode,
 541 };
 542
 543 static const struct iio_event_spec ad799x_events[] = {
 544         {
 545                 .type = IIO_EV_TYPE_THRESH,
 546                 .dir = IIO_EV_DIR_RISING,
 547                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 548                         BIT(IIO_EV_INFO_ENABLE),
 549         }, {
 550                 .type = IIO_EV_TYPE_THRESH,
 551                 .dir = IIO_EV_DIR_FALLING,
 552                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 553                         BIT(IIO_EV_INFO_ENABLE),
 554         }, {
 555                 .type = IIO_EV_TYPE_THRESH,
 556                 .dir = IIO_EV_DIR_EITHER,
 557                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 558         },
 559 };
 560
 561 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 562         .type = IIO_VOLTAGE, \
 563         .indexed = 1, \
 564         .channel = (_index), \
 565         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 566         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 567         .scan_index = (_index), \
 568         .scan_type = { \
 569                 .sign = 'u', \
 570                 .realbits = (_realbits), \
 571                 .storagebits = 16, \
 572                 .shift = 12 - (_realbits), \
 573                 .endianness = IIO_BE, \
 574         }, \
 575         .event_spec = _ev_spec, \
 576         .num_event_specs = _num_ev_spec, \
 577 }
 578
 579 #define AD799X_CHANNEL(_index, _realbits) \
 580         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 581
 582 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 583         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 584                 ARRAY_SIZE(ad799x_events))
 585
 586 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 587         [ad7991] = {
 588                 .num_channels = 5,
 589                 .noirq_config = {
 590                         .channel = {
 591                                 AD799X_CHANNEL(0, 12),
 592                                 AD799X_CHANNEL(1, 12),
 593                                 AD799X_CHANNEL(2, 12),
 594                                 AD799X_CHANNEL(3, 12),
 595                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 596                         },
 597                         .info = &ad7991_info,
 598                 },
 599         },
 600         [ad7995] = {
 601                 .num_channels = 5,
 602                 .noirq_config = {
 603                         .channel = {
 604                                 AD799X_CHANNEL(0, 10),
 605                                 AD799X_CHANNEL(1, 10),
 606                                 AD799X_CHANNEL(2, 10),
 607                                 AD799X_CHANNEL(3, 10),
 608                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 609                         },
 610                         .info = &ad7991_info,
 611                 },
 612         },
 613         [ad7999] = {
 614                 .num_channels = 5,
 615                 .noirq_config = {
 616                         .channel = {
 617                                 AD799X_CHANNEL(0, 8),
 618                                 AD799X_CHANNEL(1, 8),
 619                                 AD799X_CHANNEL(2, 8),
 620                                 AD799X_CHANNEL(3, 8),
 621                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 622                         },
 623                         .info = &ad7991_info,
 624                 },
 625         },
 626         [ad7992] = {
 627                 .num_channels = 3,
 628                 .noirq_config = {
 629                         .channel = {
 630                                 AD799X_CHANNEL(0, 12),
 631                                 AD799X_CHANNEL(1, 12),
 632                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 633                         },
 634                         .info = &ad7993_4_7_8_noirq_info,
 635                 },
 636                 .irq_config = {
 637                         .channel = {
 638                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 639                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 640                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 641                         },
 642                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 643                         .info = &ad7993_4_7_8_irq_info,
 644                 },
 645         },
 646         [ad7993] = {
 647                 .num_channels = 5,
 648                 .noirq_config = {
 649                         .channel = {
 650                                 AD799X_CHANNEL(0, 10),
 651                                 AD799X_CHANNEL(1, 10),
 652                                 AD799X_CHANNEL(2, 10),
 653                                 AD799X_CHANNEL(3, 10),
 654                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 655                         },
 656                         .info = &ad7993_4_7_8_noirq_info,
 657                 },
 658                 .irq_config = {
 659                         .channel = {
 660                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 661                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 662                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 663                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 664                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 665                         },
 666                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 667                         .info = &ad7993_4_7_8_irq_info,
 668                 },
 669         },
 670         [ad7994] = {
 671                 .num_channels = 5,
 672                 .noirq_config = {
 673                         .channel = {
 674                                 AD799X_CHANNEL(0, 12),
 675                                 AD799X_CHANNEL(1, 12),
 676                                 AD799X_CHANNEL(2, 12),
 677                                 AD799X_CHANNEL(3, 12),
 678                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 679                         },
 680                         .info = &ad7993_4_7_8_noirq_info,
 681                 },
 682                 .irq_config = {
 683                         .channel = {
 684                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 685                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 686                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 687                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 688                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 689                         },
 690                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 691                         .info = &ad7993_4_7_8_irq_info,
 692                 },
 693         },
 694         [ad7997] = {
 695                 .num_channels = 9,
 696                 .noirq_config = {
 697                         .channel = {
 698                                 AD799X_CHANNEL(0, 10),
 699                                 AD799X_CHANNEL(1, 10),
 700                                 AD799X_CHANNEL(2, 10),
 701                                 AD799X_CHANNEL(3, 10),
 702                                 AD799X_CHANNEL(4, 10),
 703                                 AD799X_CHANNEL(5, 10),
 704                                 AD799X_CHANNEL(6, 10),
 705                                 AD799X_CHANNEL(7, 10),
 706                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 707                         },
 708                         .info = &ad7993_4_7_8_noirq_info,
 709                 },
 710                 .irq_config = {
 711                         .channel = {
 712                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 713                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 714                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 715                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 716                                 AD799X_CHANNEL(4, 10),
 717                                 AD799X_CHANNEL(5, 10),
 718                                 AD799X_CHANNEL(6, 10),
 719                                 AD799X_CHANNEL(7, 10),
 720                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 721                         },
 722                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 723                         .info = &ad7993_4_7_8_irq_info,
 724                 },
 725         },
 726         [ad7998] = {
 727                 .num_channels = 9,
 728                 .noirq_config = {
 729                         .channel = {
 730                                 AD799X_CHANNEL(0, 12),
 731                                 AD799X_CHANNEL(1, 12),
 732                                 AD799X_CHANNEL(2, 12),
 733                                 AD799X_CHANNEL(3, 12),
 734                                 AD799X_CHANNEL(4, 12),
 735                                 AD799X_CHANNEL(5, 12),
 736                                 AD799X_CHANNEL(6, 12),
 737                                 AD799X_CHANNEL(7, 12),
 738                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 739                         },
 740                         .info = &ad7993_4_7_8_noirq_info,
 741                 },
 742                 .irq_config = {
 743                         .channel = {
 744                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 745                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 746                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 747                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 748                                 AD799X_CHANNEL(4, 12),
 749                                 AD799X_CHANNEL(5, 12),
 750                                 AD799X_CHANNEL(6, 12),
 751                                 AD799X_CHANNEL(7, 12),
 752                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 753                         },
 754                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 755                         .info = &ad7993_4_7_8_irq_info,
 756                 },
 757         },
 758 };
 759
 760 static int ad799x_probe(struct i2c_client *client,
 761                                    const struct i2c_device_id *id)
 762 {
 763         int ret;
 764         struct ad799x_state *st;
 765         struct iio_dev *indio_dev;
 766         const struct ad799x_chip_info *chip_info =
 767                 &ad799x_chip_info_tbl[id->driver_data];
 768
 769         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 770         if (indio_dev == NULL)
 771                 return -ENOMEM;
 772
 773         st = iio_priv(indio_dev);
 774         /* this is only used for device removal purposes */
 775         i2c_set_clientdata(client, indio_dev);
 776
 777         st->id = id->driver_data;
 778         if (client->irq > 0 && chip_info->irq_config.info)
 779                 st->chip_config = &chip_info->irq_config;
 780         else
 781                 st->chip_config = &chip_info->noirq_config;
 782
 783         /* TODO: Add pdata options for filtering and bit delay */
 784
 785         st->reg = devm_regulator_get(&client->dev, "vcc");
 786         if (IS_ERR(st->reg))
 787                 return PTR_ERR(st->reg);
 788         ret = regulator_enable(st->reg);
 789         if (ret)
 790                 return ret;
 791         st->vref = devm_regulator_get(&client->dev, "vref");
 792         if (IS_ERR(st->vref)) {
 793                 ret = PTR_ERR(st->vref);
 794                 goto error_disable_reg;
 795         }
 796         ret = regulator_enable(st->vref);
 797         if (ret)
 798                 goto error_disable_reg;
 799
 800         st->client = client;
 801
 802         indio_dev->dev.parent = &client->dev;
 803         indio_dev->dev.of_node = client->dev.of_node;
 804         indio_dev->name = id->name;
 805         indio_dev->info = st->chip_config->info;
 806
 807         indio_dev->modes = INDIO_DIRECT_MODE;
 808         indio_dev->channels = st->chip_config->channel;
 809         indio_dev->num_channels = chip_info->num_channels;
 810
 811         ret = ad799x_write_config(st, st->chip_config->default_config);
 812         if (ret < 0)
 813                 goto error_disable_vref;
 814         ret = ad799x_read_config(st);
 815         if (ret < 0)
 816                 goto error_disable_vref;
 817         st->config = ret;
 818
 819         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 820                 &ad799x_trigger_handler, NULL);
 821         if (ret)
 822                 goto error_disable_vref;
 823
 824         if (client->irq > 0) {
 825                 ret = devm_request_threaded_irq(&client->dev,
 826                                                 client->irq,
 827                                                 NULL,
 828                                                 ad799x_event_handler,
 829                                                 IRQF_TRIGGER_FALLING |
 830                                                 IRQF_ONESHOT,
 831                                                 client->name,
 832                                                 indio_dev);
 833                 if (ret)
 834                         goto error_cleanup_ring;
 835         }
 836         ret = iio_device_register(indio_dev);
 837         if (ret)
 838                 goto error_cleanup_ring;
 839
 840         return 0;
 841
 842 error_cleanup_ring:
 843         iio_triggered_buffer_cleanup(indio_dev);
 844 error_disable_vref:
 845         regulator_disable(st->vref);
 846 error_disable_reg:
 847         regulator_disable(st->reg);
 848
 849         return ret;
 850 }
 851
 852 static int ad799x_remove(struct i2c_client *client)
 853 {
 854         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 855         struct ad799x_state *st = iio_priv(indio_dev);
 856
 857         iio_device_unregister(indio_dev);
 858
 859         iio_triggered_buffer_cleanup(indio_dev);
 860         regulator_disable(st->vref);
 861         regulator_disable(st->reg);
 862         kfree(st->rx_buf);
 863
 864         return 0;
 865 }
 866
 867 static const struct i2c_device_id ad799x_id[] = {
 868         { "ad7991", ad7991 },
 869         { "ad7995", ad7995 },
 870         { "ad7999", ad7999 },
 871         { "ad7992", ad7992 },
 872         { "ad7993", ad7993 },
 873         { "ad7994", ad7994 },
 874         { "ad7997", ad7997 },
 875         { "ad7998", ad7998 },
 876         {}
 877 };
 878
 879 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 880
 881 static struct i2c_driver ad799x_driver = {
 882         .driver = {
 883                 .name = "ad799x",
 884         },
 885         .probe = ad799x_probe,
 886         .remove = ad799x_remove,
 887         .id_table = ad799x_id,
 888 };
 889 module_i2c_driver(ad799x_driver);
 890
 891 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 892 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 893 MODULE_LICENSE("GPL v2");