drivers/iio/adc/ad799x.c

   1 /*
   2  * iio/adc/ad799x.c
   3  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   4  *
   5  * based on iio/adc/max1363
   6  * Copyright (C) 2008-2010 Jonathan Cameron
   7  *
   8  * based on linux/drivers/i2c/chips/max123x
   9  * Copyright (C) 2002-2004 Stefan Eletzhofer
  10  *
  11  * based on linux/drivers/acron/char/pcf8583.c
  12  * Copyright (C) 2000 Russell King
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  * ad799x.c
  19  *
  20  * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
  21  * ad7998 and similar chips.
  22  *
  23  */
  24
  25 #include <linux/interrupt.h>
  26 #include <linux/device.h>
  27 #include <linux/kernel.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/i2c.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/slab.h>
  32 #include <linux/types.h>
  33 #include <linux/err.h>
  34 #include <linux/module.h>
  35 #include <linux/bitops.h>
  36
  37 #include <linux/iio/iio.h>
  38 #include <linux/iio/sysfs.h>
  39 #include <linux/iio/events.h>
  40 #include <linux/iio/buffer.h>
  41 #include <linux/iio/trigger_consumer.h>
  42 #include <linux/iio/triggered_buffer.h>
  43
  44 #define AD799X_CHANNEL_SHIFT                    4
  45
  46 /*
  47  * AD7991, AD7995 and AD7999 defines
  48  */
  49
  50 #define AD7991_REF_SEL                          0x08
  51 #define AD7991_FLTR                             0x04
  52 #define AD7991_BIT_TRIAL_DELAY                  0x02
  53 #define AD7991_SAMPLE_DELAY                     0x01
  54
  55 /*
  56  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  57  */
  58
  59 #define AD7998_FLTR                             BIT(3)
  60 #define AD7998_ALERT_EN                         BIT(2)
  61 #define AD7998_BUSY_ALERT                       BIT(1)
  62 #define AD7998_BUSY_ALERT_POL                   BIT(0)
  63
  64 #define AD7998_CONV_RES_REG                     0x0
  65 #define AD7998_ALERT_STAT_REG                   0x1
  66 #define AD7998_CONF_REG                         0x2
  67 #define AD7998_CYCLE_TMR_REG                    0x3
  68
  69 #define AD7998_DATALOW_REG(x)                   ((x) * 3 + 0x4)
  70 #define AD7998_DATAHIGH_REG(x)                  ((x) * 3 + 0x5)
  71 #define AD7998_HYST_REG(x)                      ((x) * 3 + 0x6)
  72
  73 #define AD7998_CYC_MASK                         GENMASK(2, 0)
  74 #define AD7998_CYC_DIS                          0x0
  75 #define AD7998_CYC_TCONF_32                     0x1
  76 #define AD7998_CYC_TCONF_64                     0x2
  77 #define AD7998_CYC_TCONF_128                    0x3
  78 #define AD7998_CYC_TCONF_256                    0x4
  79 #define AD7998_CYC_TCONF_512                    0x5
  80 #define AD7998_CYC_TCONF_1024                   0x6
  81 #define AD7998_CYC_TCONF_2048                   0x7
  82
  83 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  84
  85 /*
  86  * AD7997 and AD7997 defines
  87  */
  88
  89 #define AD7997_8_READ_SINGLE                    BIT(7)
  90 #define AD7997_8_READ_SEQUENCE                  (BIT(6) | BIT(5) | BIT(4))
  91
  92 enum {
  93         ad7991,
  94         ad7995,
  95         ad7999,
  96         ad7992,
  97         ad7993,
  98         ad7994,
  99         ad7997,
 100         ad7998
 101 };
 102
 103 /**
 104  * struct ad799x_chip_config - chip specific information
 105  * @channel:            channel specification
 106  * @default_config:     device default configuration
 107  * @info:               pointer to iio_info struct
 108  */
 109 struct ad799x_chip_config {
 110         const struct iio_chan_spec      channel[9];
 111         u16                             default_config;
 112         const struct iio_info           *info;
 113 };
 114
 115 /**
 116  * struct ad799x_chip_info - chip specific information
 117  * @num_channels:       number of channels
 118  * @noirq_config:       device configuration w/o IRQ
 119  * @irq_config:         device configuration w/IRQ
 120  */
 121 struct ad799x_chip_info {
 122         int                             num_channels;
 123         const struct ad799x_chip_config noirq_config;
 124         const struct ad799x_chip_config irq_config;
 125 };
 126
 127 struct ad799x_state {
 128         struct i2c_client               *client;
 129         const struct ad799x_chip_config *chip_config;
 130         struct regulator                *reg;
 131         struct regulator                *vref;
 132         unsigned                        id;
 133         u16                             config;
 134
 135         u8                              *rx_buf;
 136         unsigned int                    transfer_size;
 137 };
 138
 139 static int ad799x_write_config(struct ad799x_state *st, u16 val)
 140 {
 141         switch (st->id) {
 142         case ad7997:
 143         case ad7998:
 144                 return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
 145                         val);
 146         default:
 147                 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
 148                         val);
 149         }
 150 }
 151
 152 static int ad799x_read_config(struct ad799x_state *st)
 153 {
 154         switch (st->id) {
 155         case ad7997:
 156         case ad7998:
 157                 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
 158         default:
 159                 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
 160         }
 161 }
 162
 163 /**
 164  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 165  *
 166  * Currently there is no option in this driver to disable the saving of
 167  * timestamps within the ring.
 168  **/
 169 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 170 {
 171         struct iio_poll_func *pf = p;
 172         struct iio_dev *indio_dev = pf->indio_dev;
 173         struct ad799x_state *st = iio_priv(indio_dev);
 174         int b_sent;
 175         u8 cmd;
 176
 177         switch (st->id) {
 178         case ad7991:
 179         case ad7995:
 180         case ad7999:
 181                 cmd = st->config |
 182                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 183                 break;
 184         case ad7992:
 185         case ad7993:
 186         case ad7994:
 187                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 188                         AD7998_CONV_RES_REG;
 189                 break;
 190         case ad7997:
 191         case ad7998:
 192                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 193                 break;
 194         default:
 195                 cmd = 0;
 196         }
 197
 198         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 199                         cmd, st->transfer_size, st->rx_buf);
 200         if (b_sent < 0)
 201                 goto out;
 202
 203         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 204                         iio_get_time_ns());
 205 out:
 206         iio_trigger_notify_done(indio_dev->trig);
 207
 208         return IRQ_HANDLED;
 209 }
 210
 211 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 212         const unsigned long *scan_mask)
 213 {
 214         struct ad799x_state *st = iio_priv(indio_dev);
 215
 216         kfree(st->rx_buf);
 217         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 218         if (!st->rx_buf)
 219                 return -ENOMEM;
 220
 221         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 222
 223         switch (st->id) {
 224         case ad7992:
 225         case ad7993:
 226         case ad7994:
 227         case ad7997:
 228         case ad7998:
 229                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 230                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 231                 return ad799x_write_config(st, st->config);
 232         default:
 233                 return 0;
 234         }
 235 }
 236
 237 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 238 {
 239         u8 cmd;
 240
 241         switch (st->id) {
 242         case ad7991:
 243         case ad7995:
 244         case ad7999:
 245                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 246                 break;
 247         case ad7992:
 248         case ad7993:
 249         case ad7994:
 250                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 251                 break;
 252         case ad7997:
 253         case ad7998:
 254                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259
 260         return i2c_smbus_read_word_swapped(st->client, cmd);
 261 }
 262
 263 static int ad799x_read_raw(struct iio_dev *indio_dev,
 264                            struct iio_chan_spec const *chan,
 265                            int *val,
 266                            int *val2,
 267                            long m)
 268 {
 269         int ret;
 270         struct ad799x_state *st = iio_priv(indio_dev);
 271
 272         switch (m) {
 273         case IIO_CHAN_INFO_RAW:
 274                 mutex_lock(&indio_dev->mlock);
 275                 if (iio_buffer_enabled(indio_dev))
 276                         ret = -EBUSY;
 277                 else
 278                         ret = ad799x_scan_direct(st, chan->scan_index);
 279                 mutex_unlock(&indio_dev->mlock);
 280
 281                 if (ret < 0)
 282                         return ret;
 283                 *val = (ret >> chan->scan_type.shift) &
 284                         GENMASK(chan->scan_type.realbits - 1, 0);
 285                 return IIO_VAL_INT;
 286         case IIO_CHAN_INFO_SCALE:
 287                 ret = regulator_get_voltage(st->vref);
 288                 if (ret < 0)
 289                         return ret;
 290                 *val = ret / 1000;
 291                 *val2 = chan->scan_type.realbits;
 292                 return IIO_VAL_FRACTIONAL_LOG2;
 293         }
 294         return -EINVAL;
 295 }
 296 static const unsigned int ad7998_frequencies[] = {
 297         [AD7998_CYC_DIS]        = 0,
 298         [AD7998_CYC_TCONF_32]   = 15625,
 299         [AD7998_CYC_TCONF_64]   = 7812,
 300         [AD7998_CYC_TCONF_128]  = 3906,
 301         [AD7998_CYC_TCONF_512]  = 976,
 302         [AD7998_CYC_TCONF_1024] = 488,
 303         [AD7998_CYC_TCONF_2048] = 244,
 304 };
 305
 306 static ssize_t ad799x_read_frequency(struct device *dev,
 307                                         struct device_attribute *attr,
 308                                         char *buf)
 309 {
 310         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 311         struct ad799x_state *st = iio_priv(indio_dev);
 312
 313         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 314         if (ret < 0)
 315                 return ret;
 316
 317         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 318 }
 319
 320 static ssize_t ad799x_write_frequency(struct device *dev,
 321                                          struct device_attribute *attr,
 322                                          const char *buf,
 323                                          size_t len)
 324 {
 325         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 326         struct ad799x_state *st = iio_priv(indio_dev);
 327
 328         long val;
 329         int ret, i;
 330
 331         ret = kstrtol(buf, 10, &val);
 332         if (ret)
 333                 return ret;
 334
 335         mutex_lock(&indio_dev->mlock);
 336         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 337         if (ret < 0)
 338                 goto error_ret_mutex;
 339         /* Wipe the bits clean */
 340         ret &= ~AD7998_CYC_MASK;
 341
 342         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 343                 if (val == ad7998_frequencies[i])
 344                         break;
 345         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 346                 ret = -EINVAL;
 347                 goto error_ret_mutex;
 348         }
 349
 350         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 351                 ret | i);
 352         if (ret < 0)
 353                 goto error_ret_mutex;
 354         ret = len;
 355
 356 error_ret_mutex:
 357         mutex_unlock(&indio_dev->mlock);
 358
 359         return ret;
 360 }
 361
 362 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 363                                     const struct iio_chan_spec *chan,
 364                                     enum iio_event_type type,
 365                                     enum iio_event_direction dir)
 366 {
 367         struct ad799x_state *st = iio_priv(indio_dev);
 368
 369         if (!(st->config & AD7998_ALERT_EN))
 370                 return 0;
 371
 372         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 373                 return 1;
 374
 375         return 0;
 376 }
 377
 378 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 379                                      const struct iio_chan_spec *chan,
 380                                      enum iio_event_type type,
 381                                      enum iio_event_direction dir,
 382                                      int state)
 383 {
 384         struct ad799x_state *st = iio_priv(indio_dev);
 385         int ret;
 386
 387         mutex_lock(&indio_dev->mlock);
 388         if (iio_buffer_enabled(indio_dev)) {
 389                 ret = -EBUSY;
 390                 goto done;
 391         }
 392
 393         if (state)
 394                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 395         else
 396                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 397
 398         if (st->config >> AD799X_CHANNEL_SHIFT)
 399                 st->config |= AD7998_ALERT_EN;
 400         else
 401                 st->config &= ~AD7998_ALERT_EN;
 402
 403         ret = ad799x_write_config(st, st->config);
 404
 405 done:
 406         mutex_unlock(&indio_dev->mlock);
 407
 408         return ret;
 409 }
 410
 411 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 412                                          enum iio_event_direction dir,
 413                                          enum iio_event_info info)
 414 {
 415         switch (info) {
 416         case IIO_EV_INFO_VALUE:
 417                 if (dir == IIO_EV_DIR_FALLING)
 418                         return AD7998_DATALOW_REG(chan->channel);
 419                 else
 420                         return AD7998_DATAHIGH_REG(chan->channel);
 421         case IIO_EV_INFO_HYSTERESIS:
 422                 return AD7998_HYST_REG(chan->channel);
 423         default:
 424                 return -EINVAL;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 431                                     const struct iio_chan_spec *chan,
 432                                     enum iio_event_type type,
 433                                     enum iio_event_direction dir,
 434                                     enum iio_event_info info,
 435                                     int val, int val2)
 436 {
 437         int ret;
 438         struct ad799x_state *st = iio_priv(indio_dev);
 439
 440         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 441                 return -EINVAL;
 442
 443         mutex_lock(&indio_dev->mlock);
 444         ret = i2c_smbus_write_word_swapped(st->client,
 445                 ad799x_threshold_reg(chan, dir, info),
 446                 val << chan->scan_type.shift);
 447         mutex_unlock(&indio_dev->mlock);
 448
 449         return ret;
 450 }
 451
 452 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 453                                     const struct iio_chan_spec *chan,
 454                                     enum iio_event_type type,
 455                                     enum iio_event_direction dir,
 456                                     enum iio_event_info info,
 457                                     int *val, int *val2)
 458 {
 459         int ret;
 460         struct ad799x_state *st = iio_priv(indio_dev);
 461
 462         mutex_lock(&indio_dev->mlock);
 463         ret = i2c_smbus_read_word_swapped(st->client,
 464                 ad799x_threshold_reg(chan, dir, info));
 465         mutex_unlock(&indio_dev->mlock);
 466         if (ret < 0)
 467                 return ret;
 468         *val = (ret >> chan->scan_type.shift) &
 469                 GENMASK(chan->scan_type.realbits - 1 , 0);
 470
 471         return IIO_VAL_INT;
 472 }
 473
 474 static irqreturn_t ad799x_event_handler(int irq, void *private)
 475 {
 476         struct iio_dev *indio_dev = private;
 477         struct ad799x_state *st = iio_priv(private);
 478         int i, ret;
 479
 480         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 481         if (ret <= 0)
 482                 goto done;
 483
 484         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 485                 AD7998_ALERT_STAT_CLEAR) < 0)
 486                 goto done;
 487
 488         for (i = 0; i < 8; i++) {
 489                 if (ret & BIT(i))
 490                         iio_push_event(indio_dev,
 491                                        i & 0x1 ?
 492                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 493                                                             (i >> 1),
 494                                                             IIO_EV_TYPE_THRESH,
 495                                                             IIO_EV_DIR_RISING) :
 496                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 497                                                             (i >> 1),
 498                                                             IIO_EV_TYPE_THRESH,
 499                                                             IIO_EV_DIR_FALLING),
 500                                        iio_get_time_ns());
 501         }
 502
 503 done:
 504         return IRQ_HANDLED;
 505 }
 506
 507 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 508                               ad799x_read_frequency,
 509                               ad799x_write_frequency);
 510 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 511
 512 static struct attribute *ad799x_event_attributes[] = {
 513         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 514         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 515         NULL,
 516 };
 517
 518 static struct attribute_group ad799x_event_attrs_group = {
 519         .attrs = ad799x_event_attributes,
 520         .name = "events",
 521 };
 522
 523 static const struct iio_info ad7991_info = {
 524         .read_raw = &ad799x_read_raw,
 525         .driver_module = THIS_MODULE,
 526 };
 527
 528 static const struct iio_info ad7993_4_7_8_noirq_info = {
 529         .read_raw = &ad799x_read_raw,
 530         .driver_module = THIS_MODULE,
 531         .update_scan_mode = ad799x_update_scan_mode,
 532 };
 533
 534 static const struct iio_info ad7993_4_7_8_irq_info = {
 535         .read_raw = &ad799x_read_raw,
 536         .event_attrs = &ad799x_event_attrs_group,
 537         .read_event_config = &ad799x_read_event_config,
 538         .write_event_config = &ad799x_write_event_config,
 539         .read_event_value = &ad799x_read_event_value,
 540         .write_event_value = &ad799x_write_event_value,
 541         .driver_module = THIS_MODULE,
 542         .update_scan_mode = ad799x_update_scan_mode,
 543 };
 544
 545 static const struct iio_event_spec ad799x_events[] = {
 546         {
 547                 .type = IIO_EV_TYPE_THRESH,
 548                 .dir = IIO_EV_DIR_RISING,
 549                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 550                         BIT(IIO_EV_INFO_ENABLE),
 551         }, {
 552                 .type = IIO_EV_TYPE_THRESH,
 553                 .dir = IIO_EV_DIR_FALLING,
 554                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 555                         BIT(IIO_EV_INFO_ENABLE),
 556         }, {
 557                 .type = IIO_EV_TYPE_THRESH,
 558                 .dir = IIO_EV_DIR_EITHER,
 559                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 560         },
 561 };
 562
 563 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 564         .type = IIO_VOLTAGE, \
 565         .indexed = 1, \
 566         .channel = (_index), \
 567         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 568         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 569         .scan_index = (_index), \
 570         .scan_type = { \
 571                 .sign = 'u', \
 572                 .realbits = (_realbits), \
 573                 .storagebits = 16, \
 574                 .shift = 12 - (_realbits), \
 575                 .endianness = IIO_BE, \
 576         }, \
 577         .event_spec = _ev_spec, \
 578         .num_event_specs = _num_ev_spec, \
 579 }
 580
 581 #define AD799X_CHANNEL(_index, _realbits) \
 582         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 583
 584 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 585         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 586                 ARRAY_SIZE(ad799x_events))
 587
 588 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 589         [ad7991] = {
 590                 .num_channels = 5,
 591                 .noirq_config = {
 592                         .channel = {
 593                                 AD799X_CHANNEL(0, 12),
 594                                 AD799X_CHANNEL(1, 12),
 595                                 AD799X_CHANNEL(2, 12),
 596                                 AD799X_CHANNEL(3, 12),
 597                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 598                         },
 599                         .info = &ad7991_info,
 600                 },
 601         },
 602         [ad7995] = {
 603                 .num_channels = 5,
 604                 .noirq_config = {
 605                         .channel = {
 606                                 AD799X_CHANNEL(0, 10),
 607                                 AD799X_CHANNEL(1, 10),
 608                                 AD799X_CHANNEL(2, 10),
 609                                 AD799X_CHANNEL(3, 10),
 610                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 611                         },
 612                         .info = &ad7991_info,
 613                 },
 614         },
 615         [ad7999] = {
 616                 .num_channels = 5,
 617                 .noirq_config = {
 618                         .channel = {
 619                                 AD799X_CHANNEL(0, 8),
 620                                 AD799X_CHANNEL(1, 8),
 621                                 AD799X_CHANNEL(2, 8),
 622                                 AD799X_CHANNEL(3, 8),
 623                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 624                         },
 625                         .info = &ad7991_info,
 626                 },
 627         },
 628         [ad7992] = {
 629                 .num_channels = 3,
 630                 .noirq_config = {
 631                         .channel = {
 632                                 AD799X_CHANNEL(0, 12),
 633                                 AD799X_CHANNEL(1, 12),
 634                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 635                         },
 636                         .info = &ad7993_4_7_8_noirq_info,
 637                 },
 638                 .irq_config = {
 639                         .channel = {
 640                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 641                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 642                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 643                         },
 644                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 645                         .info = &ad7993_4_7_8_irq_info,
 646                 },
 647         },
 648         [ad7993] = {
 649                 .num_channels = 5,
 650                 .noirq_config = {
 651                         .channel = {
 652                                 AD799X_CHANNEL(0, 10),
 653                                 AD799X_CHANNEL(1, 10),
 654                                 AD799X_CHANNEL(2, 10),
 655                                 AD799X_CHANNEL(3, 10),
 656                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 657                         },
 658                         .info = &ad7993_4_7_8_noirq_info,
 659                 },
 660                 .irq_config = {
 661                         .channel = {
 662                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 663                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 664                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 665                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 666                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 667                         },
 668                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 669                         .info = &ad7993_4_7_8_irq_info,
 670                 },
 671         },
 672         [ad7994] = {
 673                 .num_channels = 5,
 674                 .noirq_config = {
 675                         .channel = {
 676                                 AD799X_CHANNEL(0, 12),
 677                                 AD799X_CHANNEL(1, 12),
 678                                 AD799X_CHANNEL(2, 12),
 679                                 AD799X_CHANNEL(3, 12),
 680                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 681                         },
 682                         .info = &ad7993_4_7_8_noirq_info,
 683                 },
 684                 .irq_config = {
 685                         .channel = {
 686                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 687                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 688                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 689                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 690                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 691                         },
 692                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 693                         .info = &ad7993_4_7_8_irq_info,
 694                 },
 695         },
 696         [ad7997] = {
 697                 .num_channels = 9,
 698                 .noirq_config = {
 699                         .channel = {
 700                                 AD799X_CHANNEL(0, 10),
 701                                 AD799X_CHANNEL(1, 10),
 702                                 AD799X_CHANNEL(2, 10),
 703                                 AD799X_CHANNEL(3, 10),
 704                                 AD799X_CHANNEL(4, 10),
 705                                 AD799X_CHANNEL(5, 10),
 706                                 AD799X_CHANNEL(6, 10),
 707                                 AD799X_CHANNEL(7, 10),
 708                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 709                         },
 710                         .info = &ad7993_4_7_8_noirq_info,
 711                 },
 712                 .irq_config = {
 713                         .channel = {
 714                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 715                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 716                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 717                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 718                                 AD799X_CHANNEL(4, 10),
 719                                 AD799X_CHANNEL(5, 10),
 720                                 AD799X_CHANNEL(6, 10),
 721                                 AD799X_CHANNEL(7, 10),
 722                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 723                         },
 724                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 725                         .info = &ad7993_4_7_8_irq_info,
 726                 },
 727         },
 728         [ad7998] = {
 729                 .num_channels = 9,
 730                 .noirq_config = {
 731                         .channel = {
 732                                 AD799X_CHANNEL(0, 12),
 733                                 AD799X_CHANNEL(1, 12),
 734                                 AD799X_CHANNEL(2, 12),
 735                                 AD799X_CHANNEL(3, 12),
 736                                 AD799X_CHANNEL(4, 12),
 737                                 AD799X_CHANNEL(5, 12),
 738                                 AD799X_CHANNEL(6, 12),
 739                                 AD799X_CHANNEL(7, 12),
 740                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 741                         },
 742                         .info = &ad7993_4_7_8_noirq_info,
 743                 },
 744                 .irq_config = {
 745                         .channel = {
 746                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 747                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 748                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 749                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 750                                 AD799X_CHANNEL(4, 12),
 751                                 AD799X_CHANNEL(5, 12),
 752                                 AD799X_CHANNEL(6, 12),
 753                                 AD799X_CHANNEL(7, 12),
 754                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 755                         },
 756                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 757                         .info = &ad7993_4_7_8_irq_info,
 758                 },
 759         },
 760 };
 761
 762 static int ad799x_probe(struct i2c_client *client,
 763                                    const struct i2c_device_id *id)
 764 {
 765         int ret;
 766         struct ad799x_state *st;
 767         struct iio_dev *indio_dev;
 768         const struct ad799x_chip_info *chip_info =
 769                 &ad799x_chip_info_tbl[id->driver_data];
 770
 771         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 772         if (indio_dev == NULL)
 773                 return -ENOMEM;
 774
 775         st = iio_priv(indio_dev);
 776         /* this is only used for device removal purposes */
 777         i2c_set_clientdata(client, indio_dev);
 778
 779         st->id = id->driver_data;
 780         if (client->irq > 0 && chip_info->irq_config.info)
 781                 st->chip_config = &chip_info->irq_config;
 782         else
 783                 st->chip_config = &chip_info->noirq_config;
 784
 785         /* TODO: Add pdata options for filtering and bit delay */
 786
 787         st->reg = devm_regulator_get(&client->dev, "vcc");
 788         if (IS_ERR(st->reg))
 789                 return PTR_ERR(st->reg);
 790         ret = regulator_enable(st->reg);
 791         if (ret)
 792                 return ret;
 793         st->vref = devm_regulator_get(&client->dev, "vref");
 794         if (IS_ERR(st->vref)) {
 795                 ret = PTR_ERR(st->vref);
 796                 goto error_disable_reg;
 797         }
 798         ret = regulator_enable(st->vref);
 799         if (ret)
 800                 goto error_disable_reg;
 801
 802         st->client = client;
 803
 804         indio_dev->dev.parent = &client->dev;
 805         indio_dev->name = id->name;
 806         indio_dev->info = st->chip_config->info;
 807
 808         indio_dev->modes = INDIO_DIRECT_MODE;
 809         indio_dev->channels = st->chip_config->channel;
 810         indio_dev->num_channels = chip_info->num_channels;
 811
 812         ret = ad799x_write_config(st, st->chip_config->default_config);
 813         if (ret < 0)
 814                 goto error_disable_reg;
 815         ret = ad799x_read_config(st);
 816         if (ret < 0)
 817                 goto error_disable_reg;
 818         st->config = ret;
 819
 820         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 821                 &ad799x_trigger_handler, NULL);
 822         if (ret)
 823                 goto error_disable_vref;
 824
 825         if (client->irq > 0) {
 826                 ret = devm_request_threaded_irq(&client->dev,
 827                                                 client->irq,
 828                                                 NULL,
 829                                                 ad799x_event_handler,
 830                                                 IRQF_TRIGGER_FALLING |
 831                                                 IRQF_ONESHOT,
 832                                                 client->name,
 833                                                 indio_dev);
 834                 if (ret)
 835                         goto error_cleanup_ring;
 836         }
 837         ret = iio_device_register(indio_dev);
 838         if (ret)
 839                 goto error_cleanup_ring;
 840
 841         return 0;
 842
 843 error_cleanup_ring:
 844         iio_triggered_buffer_cleanup(indio_dev);
 845 error_disable_vref:
 846         regulator_disable(st->vref);
 847 error_disable_reg:
 848         regulator_disable(st->reg);
 849
 850         return ret;
 851 }
 852
 853 static int ad799x_remove(struct i2c_client *client)
 854 {
 855         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 856         struct ad799x_state *st = iio_priv(indio_dev);
 857
 858         iio_device_unregister(indio_dev);
 859
 860         iio_triggered_buffer_cleanup(indio_dev);
 861         regulator_disable(st->vref);
 862         regulator_disable(st->reg);
 863         kfree(st->rx_buf);
 864
 865         return 0;
 866 }
 867
 868 static const struct i2c_device_id ad799x_id[] = {
 869         { "ad7991", ad7991 },
 870         { "ad7995", ad7995 },
 871         { "ad7999", ad7999 },
 872         { "ad7992", ad7992 },
 873         { "ad7993", ad7993 },
 874         { "ad7994", ad7994 },
 875         { "ad7997", ad7997 },
 876         { "ad7998", ad7998 },
 877         {}
 878 };
 879
 880 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 881
 882 static struct i2c_driver ad799x_driver = {
 883         .driver = {
 884                 .name = "ad799x",
 885         },
 886         .probe = ad799x_probe,
 887         .remove = ad799x_remove,
 888         .id_table = ad799x_id,
 889 };
 890 module_i2c_driver(ad799x_driver);
 891
 892 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 893 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 894 MODULE_LICENSE("GPL v2");