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         case ad7992:
 147         case ad7993:
 148         case ad7994:
 149                 return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
 150                         val);
 151         default:
 152                 /* Will be written when doing a conversion */
 153                 st->config = val;
 154                 return 0;
 155         }
 156 }
 157
 158 static int ad799x_read_config(struct ad799x_state *st)
 159 {
 160         switch (st->id) {
 161         case ad7997:
 162         case ad7998:
 163                 return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
 164         case ad7992:
 165         case ad7993:
 166         case ad7994:
 167                 return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
 168         default:
 169                 /* No readback support */
 170                 return st->config;
 171         }
 172 }
 173
 174 /**
 175  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 176  *
 177  * Currently there is no option in this driver to disable the saving of
 178  * timestamps within the ring.
 179  **/
 180 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 181 {
 182         struct iio_poll_func *pf = p;
 183         struct iio_dev *indio_dev = pf->indio_dev;
 184         struct ad799x_state *st = iio_priv(indio_dev);
 185         int b_sent;
 186         u8 cmd;
 187
 188         switch (st->id) {
 189         case ad7991:
 190         case ad7995:
 191         case ad7999:
 192                 cmd = st->config |
 193                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 194                 break;
 195         case ad7992:
 196         case ad7993:
 197         case ad7994:
 198                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 199                         AD7998_CONV_RES_REG;
 200                 break;
 201         case ad7997:
 202         case ad7998:
 203                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 204                 break;
 205         default:
 206                 cmd = 0;
 207         }
 208
 209         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 210                         cmd, st->transfer_size, st->rx_buf);
 211         if (b_sent < 0)
 212                 goto out;
 213
 214         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 215                         iio_get_time_ns(indio_dev));
 216 out:
 217         iio_trigger_notify_done(indio_dev->trig);
 218
 219         return IRQ_HANDLED;
 220 }
 221
 222 static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
 223         const unsigned long *scan_mask)
 224 {
 225         struct ad799x_state *st = iio_priv(indio_dev);
 226
 227         kfree(st->rx_buf);
 228         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 229         if (!st->rx_buf)
 230                 return -ENOMEM;
 231
 232         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 233
 234         switch (st->id) {
 235         case ad7992:
 236         case ad7993:
 237         case ad7994:
 238         case ad7997:
 239         case ad7998:
 240                 st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
 241                 st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
 242                 return ad799x_write_config(st, st->config);
 243         default:
 244                 return 0;
 245         }
 246 }
 247
 248 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 249 {
 250         u8 cmd;
 251
 252         switch (st->id) {
 253         case ad7991:
 254         case ad7995:
 255         case ad7999:
 256                 cmd = st->config | (BIT(ch) << AD799X_CHANNEL_SHIFT);
 257                 break;
 258         case ad7992:
 259         case ad7993:
 260         case ad7994:
 261                 cmd = BIT(ch) << AD799X_CHANNEL_SHIFT;
 262                 break;
 263         case ad7997:
 264         case ad7998:
 265                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 266                 break;
 267         default:
 268                 return -EINVAL;
 269         }
 270
 271         return i2c_smbus_read_word_swapped(st->client, cmd);
 272 }
 273
 274 static int ad799x_read_raw(struct iio_dev *indio_dev,
 275                            struct iio_chan_spec const *chan,
 276                            int *val,
 277                            int *val2,
 278                            long m)
 279 {
 280         int ret;
 281         struct ad799x_state *st = iio_priv(indio_dev);
 282
 283         switch (m) {
 284         case IIO_CHAN_INFO_RAW:
 285                 ret = iio_device_claim_direct_mode(indio_dev);
 286                 if (ret)
 287                         return ret;
 288                 ret = ad799x_scan_direct(st, chan->scan_index);
 289                 iio_device_release_direct_mode(indio_dev);
 290
 291                 if (ret < 0)
 292                         return ret;
 293                 *val = (ret >> chan->scan_type.shift) &
 294                         GENMASK(chan->scan_type.realbits - 1, 0);
 295                 return IIO_VAL_INT;
 296         case IIO_CHAN_INFO_SCALE:
 297                 ret = regulator_get_voltage(st->vref);
 298                 if (ret < 0)
 299                         return ret;
 300                 *val = ret / 1000;
 301                 *val2 = chan->scan_type.realbits;
 302                 return IIO_VAL_FRACTIONAL_LOG2;
 303         }
 304         return -EINVAL;
 305 }
 306 static const unsigned int ad7998_frequencies[] = {
 307         [AD7998_CYC_DIS]        = 0,
 308         [AD7998_CYC_TCONF_32]   = 15625,
 309         [AD7998_CYC_TCONF_64]   = 7812,
 310         [AD7998_CYC_TCONF_128]  = 3906,
 311         [AD7998_CYC_TCONF_512]  = 976,
 312         [AD7998_CYC_TCONF_1024] = 488,
 313         [AD7998_CYC_TCONF_2048] = 244,
 314 };
 315
 316 static ssize_t ad799x_read_frequency(struct device *dev,
 317                                         struct device_attribute *attr,
 318                                         char *buf)
 319 {
 320         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 321         struct ad799x_state *st = iio_priv(indio_dev);
 322
 323         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 324         if (ret < 0)
 325                 return ret;
 326
 327         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 328 }
 329
 330 static ssize_t ad799x_write_frequency(struct device *dev,
 331                                          struct device_attribute *attr,
 332                                          const char *buf,
 333                                          size_t len)
 334 {
 335         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 336         struct ad799x_state *st = iio_priv(indio_dev);
 337
 338         long val;
 339         int ret, i;
 340
 341         ret = kstrtol(buf, 10, &val);
 342         if (ret)
 343                 return ret;
 344
 345         mutex_lock(&indio_dev->mlock);
 346         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 347         if (ret < 0)
 348                 goto error_ret_mutex;
 349         /* Wipe the bits clean */
 350         ret &= ~AD7998_CYC_MASK;
 351
 352         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 353                 if (val == ad7998_frequencies[i])
 354                         break;
 355         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 356                 ret = -EINVAL;
 357                 goto error_ret_mutex;
 358         }
 359
 360         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 361                 ret | i);
 362         if (ret < 0)
 363                 goto error_ret_mutex;
 364         ret = len;
 365
 366 error_ret_mutex:
 367         mutex_unlock(&indio_dev->mlock);
 368
 369         return ret;
 370 }
 371
 372 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 373                                     const struct iio_chan_spec *chan,
 374                                     enum iio_event_type type,
 375                                     enum iio_event_direction dir)
 376 {
 377         struct ad799x_state *st = iio_priv(indio_dev);
 378
 379         if (!(st->config & AD7998_ALERT_EN))
 380                 return 0;
 381
 382         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 383                 return 1;
 384
 385         return 0;
 386 }
 387
 388 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 389                                      const struct iio_chan_spec *chan,
 390                                      enum iio_event_type type,
 391                                      enum iio_event_direction dir,
 392                                      int state)
 393 {
 394         struct ad799x_state *st = iio_priv(indio_dev);
 395         int ret;
 396
 397         ret = iio_device_claim_direct_mode(indio_dev);
 398         if (ret)
 399                 return ret;
 400
 401         if (state)
 402                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 403         else
 404                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 405
 406         if (st->config >> AD799X_CHANNEL_SHIFT)
 407                 st->config |= AD7998_ALERT_EN;
 408         else
 409                 st->config &= ~AD7998_ALERT_EN;
 410
 411         ret = ad799x_write_config(st, st->config);
 412         iio_device_release_direct_mode(indio_dev);
 413         return ret;
 414 }
 415
 416 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 417                                          enum iio_event_direction dir,
 418                                          enum iio_event_info info)
 419 {
 420         switch (info) {
 421         case IIO_EV_INFO_VALUE:
 422                 if (dir == IIO_EV_DIR_FALLING)
 423                         return AD7998_DATALOW_REG(chan->channel);
 424                 else
 425                         return AD7998_DATAHIGH_REG(chan->channel);
 426         case IIO_EV_INFO_HYSTERESIS:
 427                 return AD7998_HYST_REG(chan->channel);
 428         default:
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 436                                     const struct iio_chan_spec *chan,
 437                                     enum iio_event_type type,
 438                                     enum iio_event_direction dir,
 439                                     enum iio_event_info info,
 440                                     int val, int val2)
 441 {
 442         int ret;
 443         struct ad799x_state *st = iio_priv(indio_dev);
 444
 445         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 446                 return -EINVAL;
 447
 448         mutex_lock(&indio_dev->mlock);
 449         ret = i2c_smbus_write_word_swapped(st->client,
 450                 ad799x_threshold_reg(chan, dir, info),
 451                 val << chan->scan_type.shift);
 452         mutex_unlock(&indio_dev->mlock);
 453
 454         return ret;
 455 }
 456
 457 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 458                                     const struct iio_chan_spec *chan,
 459                                     enum iio_event_type type,
 460                                     enum iio_event_direction dir,
 461                                     enum iio_event_info info,
 462                                     int *val, int *val2)
 463 {
 464         int ret;
 465         struct ad799x_state *st = iio_priv(indio_dev);
 466
 467         mutex_lock(&indio_dev->mlock);
 468         ret = i2c_smbus_read_word_swapped(st->client,
 469                 ad799x_threshold_reg(chan, dir, info));
 470         mutex_unlock(&indio_dev->mlock);
 471         if (ret < 0)
 472                 return ret;
 473         *val = (ret >> chan->scan_type.shift) &
 474                 GENMASK(chan->scan_type.realbits - 1, 0);
 475
 476         return IIO_VAL_INT;
 477 }
 478
 479 static irqreturn_t ad799x_event_handler(int irq, void *private)
 480 {
 481         struct iio_dev *indio_dev = private;
 482         struct ad799x_state *st = iio_priv(private);
 483         int i, ret;
 484
 485         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 486         if (ret <= 0)
 487                 goto done;
 488
 489         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 490                 AD7998_ALERT_STAT_CLEAR) < 0)
 491                 goto done;
 492
 493         for (i = 0; i < 8; i++) {
 494                 if (ret & BIT(i))
 495                         iio_push_event(indio_dev,
 496                                        i & 0x1 ?
 497                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 498                                                             (i >> 1),
 499                                                             IIO_EV_TYPE_THRESH,
 500                                                             IIO_EV_DIR_RISING) :
 501                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 502                                                             (i >> 1),
 503                                                             IIO_EV_TYPE_THRESH,
 504                                                             IIO_EV_DIR_FALLING),
 505                                        iio_get_time_ns(indio_dev));
 506         }
 507
 508 done:
 509         return IRQ_HANDLED;
 510 }
 511
 512 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 513                               ad799x_read_frequency,
 514                               ad799x_write_frequency);
 515 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 516
 517 static struct attribute *ad799x_event_attributes[] = {
 518         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 519         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 520         NULL,
 521 };
 522
 523 static const struct attribute_group ad799x_event_attrs_group = {
 524         .attrs = ad799x_event_attributes,
 525 };
 526
 527 static const struct iio_info ad7991_info = {
 528         .read_raw = &ad799x_read_raw,
 529         .update_scan_mode = ad799x_update_scan_mode,
 530 };
 531
 532 static const struct iio_info ad7993_4_7_8_noirq_info = {
 533         .read_raw = &ad799x_read_raw,
 534         .update_scan_mode = ad799x_update_scan_mode,
 535 };
 536
 537 static const struct iio_info ad7993_4_7_8_irq_info = {
 538         .read_raw = &ad799x_read_raw,
 539         .event_attrs = &ad799x_event_attrs_group,
 540         .read_event_config = &ad799x_read_event_config,
 541         .write_event_config = &ad799x_write_event_config,
 542         .read_event_value = &ad799x_read_event_value,
 543         .write_event_value = &ad799x_write_event_value,
 544         .update_scan_mode = ad799x_update_scan_mode,
 545 };
 546
 547 static const struct iio_event_spec ad799x_events[] = {
 548         {
 549                 .type = IIO_EV_TYPE_THRESH,
 550                 .dir = IIO_EV_DIR_RISING,
 551                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 552                         BIT(IIO_EV_INFO_ENABLE),
 553         }, {
 554                 .type = IIO_EV_TYPE_THRESH,
 555                 .dir = IIO_EV_DIR_FALLING,
 556                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 557                         BIT(IIO_EV_INFO_ENABLE),
 558         }, {
 559                 .type = IIO_EV_TYPE_THRESH,
 560                 .dir = IIO_EV_DIR_EITHER,
 561                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 562         },
 563 };
 564
 565 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 566         .type = IIO_VOLTAGE, \
 567         .indexed = 1, \
 568         .channel = (_index), \
 569         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 570         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 571         .scan_index = (_index), \
 572         .scan_type = { \
 573                 .sign = 'u', \
 574                 .realbits = (_realbits), \
 575                 .storagebits = 16, \
 576                 .shift = 12 - (_realbits), \
 577                 .endianness = IIO_BE, \
 578         }, \
 579         .event_spec = _ev_spec, \
 580         .num_event_specs = _num_ev_spec, \
 581 }
 582
 583 #define AD799X_CHANNEL(_index, _realbits) \
 584         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 585
 586 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 587         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 588                 ARRAY_SIZE(ad799x_events))
 589
 590 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 591         [ad7991] = {
 592                 .num_channels = 5,
 593                 .noirq_config = {
 594                         .channel = {
 595                                 AD799X_CHANNEL(0, 12),
 596                                 AD799X_CHANNEL(1, 12),
 597                                 AD799X_CHANNEL(2, 12),
 598                                 AD799X_CHANNEL(3, 12),
 599                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 600                         },
 601                         .info = &ad7991_info,
 602                 },
 603         },
 604         [ad7995] = {
 605                 .num_channels = 5,
 606                 .noirq_config = {
 607                         .channel = {
 608                                 AD799X_CHANNEL(0, 10),
 609                                 AD799X_CHANNEL(1, 10),
 610                                 AD799X_CHANNEL(2, 10),
 611                                 AD799X_CHANNEL(3, 10),
 612                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 613                         },
 614                         .info = &ad7991_info,
 615                 },
 616         },
 617         [ad7999] = {
 618                 .num_channels = 5,
 619                 .noirq_config = {
 620                         .channel = {
 621                                 AD799X_CHANNEL(0, 8),
 622                                 AD799X_CHANNEL(1, 8),
 623                                 AD799X_CHANNEL(2, 8),
 624                                 AD799X_CHANNEL(3, 8),
 625                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 626                         },
 627                         .info = &ad7991_info,
 628                 },
 629         },
 630         [ad7992] = {
 631                 .num_channels = 3,
 632                 .noirq_config = {
 633                         .channel = {
 634                                 AD799X_CHANNEL(0, 12),
 635                                 AD799X_CHANNEL(1, 12),
 636                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 637                         },
 638                         .info = &ad7993_4_7_8_noirq_info,
 639                 },
 640                 .irq_config = {
 641                         .channel = {
 642                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 643                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 644                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 645                         },
 646                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 647                         .info = &ad7993_4_7_8_irq_info,
 648                 },
 649         },
 650         [ad7993] = {
 651                 .num_channels = 5,
 652                 .noirq_config = {
 653                         .channel = {
 654                                 AD799X_CHANNEL(0, 10),
 655                                 AD799X_CHANNEL(1, 10),
 656                                 AD799X_CHANNEL(2, 10),
 657                                 AD799X_CHANNEL(3, 10),
 658                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 659                         },
 660                         .info = &ad7993_4_7_8_noirq_info,
 661                 },
 662                 .irq_config = {
 663                         .channel = {
 664                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 665                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 666                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 667                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 668                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 669                         },
 670                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 671                         .info = &ad7993_4_7_8_irq_info,
 672                 },
 673         },
 674         [ad7994] = {
 675                 .num_channels = 5,
 676                 .noirq_config = {
 677                         .channel = {
 678                                 AD799X_CHANNEL(0, 12),
 679                                 AD799X_CHANNEL(1, 12),
 680                                 AD799X_CHANNEL(2, 12),
 681                                 AD799X_CHANNEL(3, 12),
 682                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 683                         },
 684                         .info = &ad7993_4_7_8_noirq_info,
 685                 },
 686                 .irq_config = {
 687                         .channel = {
 688                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 689                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 690                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 691                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 692                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 693                         },
 694                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 695                         .info = &ad7993_4_7_8_irq_info,
 696                 },
 697         },
 698         [ad7997] = {
 699                 .num_channels = 9,
 700                 .noirq_config = {
 701                         .channel = {
 702                                 AD799X_CHANNEL(0, 10),
 703                                 AD799X_CHANNEL(1, 10),
 704                                 AD799X_CHANNEL(2, 10),
 705                                 AD799X_CHANNEL(3, 10),
 706                                 AD799X_CHANNEL(4, 10),
 707                                 AD799X_CHANNEL(5, 10),
 708                                 AD799X_CHANNEL(6, 10),
 709                                 AD799X_CHANNEL(7, 10),
 710                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 711                         },
 712                         .info = &ad7993_4_7_8_noirq_info,
 713                 },
 714                 .irq_config = {
 715                         .channel = {
 716                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 717                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 718                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 719                                 AD799X_CHANNEL_WITH_EVENTS(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                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 727                         .info = &ad7993_4_7_8_irq_info,
 728                 },
 729         },
 730         [ad7998] = {
 731                 .num_channels = 9,
 732                 .noirq_config = {
 733                         .channel = {
 734                                 AD799X_CHANNEL(0, 12),
 735                                 AD799X_CHANNEL(1, 12),
 736                                 AD799X_CHANNEL(2, 12),
 737                                 AD799X_CHANNEL(3, 12),
 738                                 AD799X_CHANNEL(4, 12),
 739                                 AD799X_CHANNEL(5, 12),
 740                                 AD799X_CHANNEL(6, 12),
 741                                 AD799X_CHANNEL(7, 12),
 742                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 743                         },
 744                         .info = &ad7993_4_7_8_noirq_info,
 745                 },
 746                 .irq_config = {
 747                         .channel = {
 748                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 749                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 750                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 751                                 AD799X_CHANNEL_WITH_EVENTS(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                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 759                         .info = &ad7993_4_7_8_irq_info,
 760                 },
 761         },
 762 };
 763
 764 static int ad799x_probe(struct i2c_client *client,
 765                                    const struct i2c_device_id *id)
 766 {
 767         int ret;
 768         struct ad799x_state *st;
 769         struct iio_dev *indio_dev;
 770         const struct ad799x_chip_info *chip_info =
 771                 &ad799x_chip_info_tbl[id->driver_data];
 772
 773         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 774         if (indio_dev == NULL)
 775                 return -ENOMEM;
 776
 777         st = iio_priv(indio_dev);
 778         /* this is only used for device removal purposes */
 779         i2c_set_clientdata(client, indio_dev);
 780
 781         st->id = id->driver_data;
 782         if (client->irq > 0 && chip_info->irq_config.info)
 783                 st->chip_config = &chip_info->irq_config;
 784         else
 785                 st->chip_config = &chip_info->noirq_config;
 786
 787         /* TODO: Add pdata options for filtering and bit delay */
 788
 789         st->reg = devm_regulator_get(&client->dev, "vcc");
 790         if (IS_ERR(st->reg))
 791                 return PTR_ERR(st->reg);
 792         ret = regulator_enable(st->reg);
 793         if (ret)
 794                 return ret;
 795         st->vref = devm_regulator_get(&client->dev, "vref");
 796         if (IS_ERR(st->vref)) {
 797                 ret = PTR_ERR(st->vref);
 798                 goto error_disable_reg;
 799         }
 800         ret = regulator_enable(st->vref);
 801         if (ret)
 802                 goto error_disable_reg;
 803
 804         st->client = client;
 805
 806         indio_dev->dev.parent = &client->dev;
 807         indio_dev->dev.of_node = client->dev.of_node;
 808         indio_dev->name = id->name;
 809         indio_dev->info = st->chip_config->info;
 810
 811         indio_dev->modes = INDIO_DIRECT_MODE;
 812         indio_dev->channels = st->chip_config->channel;
 813         indio_dev->num_channels = chip_info->num_channels;
 814
 815         ret = ad799x_write_config(st, st->chip_config->default_config);
 816         if (ret < 0)
 817                 goto error_disable_vref;
 818         ret = ad799x_read_config(st);
 819         if (ret < 0)
 820                 goto error_disable_vref;
 821         st->config = ret;
 822
 823         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 824                 &ad799x_trigger_handler, NULL);
 825         if (ret)
 826                 goto error_disable_vref;
 827
 828         if (client->irq > 0) {
 829                 ret = devm_request_threaded_irq(&client->dev,
 830                                                 client->irq,
 831                                                 NULL,
 832                                                 ad799x_event_handler,
 833                                                 IRQF_TRIGGER_FALLING |
 834                                                 IRQF_ONESHOT,
 835                                                 client->name,
 836                                                 indio_dev);
 837                 if (ret)
 838                         goto error_cleanup_ring;
 839         }
 840         ret = iio_device_register(indio_dev);
 841         if (ret)
 842                 goto error_cleanup_ring;
 843
 844         return 0;
 845
 846 error_cleanup_ring:
 847         iio_triggered_buffer_cleanup(indio_dev);
 848 error_disable_vref:
 849         regulator_disable(st->vref);
 850 error_disable_reg:
 851         regulator_disable(st->reg);
 852
 853         return ret;
 854 }
 855
 856 static int ad799x_remove(struct i2c_client *client)
 857 {
 858         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 859         struct ad799x_state *st = iio_priv(indio_dev);
 860
 861         iio_device_unregister(indio_dev);
 862
 863         iio_triggered_buffer_cleanup(indio_dev);
 864         regulator_disable(st->vref);
 865         regulator_disable(st->reg);
 866         kfree(st->rx_buf);
 867
 868         return 0;
 869 }
 870
 871 static const struct i2c_device_id ad799x_id[] = {
 872         { "ad7991", ad7991 },
 873         { "ad7995", ad7995 },
 874         { "ad7999", ad7999 },
 875         { "ad7992", ad7992 },
 876         { "ad7993", ad7993 },
 877         { "ad7994", ad7994 },
 878         { "ad7997", ad7997 },
 879         { "ad7998", ad7998 },
 880         {}
 881 };
 882
 883 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 884
 885 static struct i2c_driver ad799x_driver = {
 886         .driver = {
 887                 .name = "ad799x",
 888         },
 889         .probe = ad799x_probe,
 890         .remove = ad799x_remove,
 891         .id_table = ad799x_id,
 892 };
 893 module_i2c_driver(ad799x_driver);
 894
 895 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 896 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 897 MODULE_LICENSE("GPL v2");