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
  36 #include <linux/iio/iio.h>
  37 #include <linux/iio/sysfs.h>
  38 #include <linux/iio/events.h>
  39 #include <linux/iio/buffer.h>
  40 #include <linux/iio/trigger_consumer.h>
  41 #include <linux/iio/triggered_buffer.h>
  42
  43 #define AD799X_CHANNEL_SHIFT                    4
  44 #define AD799X_STORAGEBITS                      16
  45 /*
  46  * AD7991, AD7995 and AD7999 defines
  47  */
  48
  49 #define AD7991_REF_SEL                          0x08
  50 #define AD7991_FLTR                             0x04
  51 #define AD7991_BIT_TRIAL_DELAY                  0x02
  52 #define AD7991_SAMPLE_DELAY                     0x01
  53
  54 /*
  55  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  56  */
  57
  58 #define AD7998_FLTR                             0x08
  59 #define AD7998_ALERT_EN                         0x04
  60 #define AD7998_BUSY_ALERT                       0x02
  61 #define AD7998_BUSY_ALERT_POL                   0x01
  62
  63 #define AD7998_CONV_RES_REG                     0x0
  64 #define AD7998_ALERT_STAT_REG                   0x1
  65 #define AD7998_CONF_REG                         0x2
  66 #define AD7998_CYCLE_TMR_REG                    0x3
  67
  68 #define AD7998_DATALOW_REG(x)                   ((x) * 3 + 0x4)
  69 #define AD7998_DATAHIGH_REG(x)                  ((x) * 3 + 0x5)
  70 #define AD7998_HYST_REG(x)                      ((x) * 3 + 0x6)
  71
  72 #define AD7998_CYC_MASK                         0x7
  73 #define AD7998_CYC_DIS                          0x0
  74 #define AD7998_CYC_TCONF_32                     0x1
  75 #define AD7998_CYC_TCONF_64                     0x2
  76 #define AD7998_CYC_TCONF_128                    0x3
  77 #define AD7998_CYC_TCONF_256                    0x4
  78 #define AD7998_CYC_TCONF_512                    0x5
  79 #define AD7998_CYC_TCONF_1024                   0x6
  80 #define AD7998_CYC_TCONF_2048                   0x7
  81
  82 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  83
  84 /*
  85  * AD7997 and AD7997 defines
  86  */
  87
  88 #define AD7997_8_READ_SINGLE                    0x80
  89 #define AD7997_8_READ_SEQUENCE                  0x70
  90 /* TODO: move this into a common header */
  91 #define RES_MASK(bits)  ((1 << (bits)) - 1)
  92
  93 enum {
  94         ad7991,
  95         ad7995,
  96         ad7999,
  97         ad7992,
  98         ad7993,
  99         ad7994,
 100         ad7997,
 101         ad7998
 102 };
 103
 104 /**
 105  * struct ad799x_chip_info - chip specific information
 106  * @channel:            channel specification
 107  * @num_channels:       number of channels
 108  * @monitor_mode:       whether the chip supports monitor interrupts
 109  * @default_config:     device default configuration
 110  * @event_attrs:        pointer to the monitor event attribute group
 111  */
 112 struct ad799x_chip_info {
 113         struct iio_chan_spec            channel[9];
 114         int                             num_channels;
 115         u16                             default_config;
 116         const struct iio_info           *info;
 117 };
 118
 119 struct ad799x_state {
 120         struct i2c_client               *client;
 121         const struct ad799x_chip_info   *chip_info;
 122         struct regulator                *reg;
 123         struct regulator                *vref;
 124         unsigned                        id;
 125         u16                             config;
 126
 127         u8                              *rx_buf;
 128         unsigned int                    transfer_size;
 129 };
 130
 131 /**
 132  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 133  *
 134  * Currently there is no option in this driver to disable the saving of
 135  * timestamps within the ring.
 136  **/
 137 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 138 {
 139         struct iio_poll_func *pf = p;
 140         struct iio_dev *indio_dev = pf->indio_dev;
 141         struct ad799x_state *st = iio_priv(indio_dev);
 142         int b_sent;
 143         u8 cmd;
 144
 145         switch (st->id) {
 146         case ad7991:
 147         case ad7995:
 148         case ad7999:
 149                 cmd = st->config |
 150                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 151                 break;
 152         case ad7992:
 153         case ad7993:
 154         case ad7994:
 155                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 156                         AD7998_CONV_RES_REG;
 157                 break;
 158         case ad7997:
 159         case ad7998:
 160                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 161                 break;
 162         default:
 163                 cmd = 0;
 164         }
 165
 166         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 167                         cmd, st->transfer_size, st->rx_buf);
 168         if (b_sent < 0)
 169                 goto out;
 170
 171         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 172                         iio_get_time_ns());
 173 out:
 174         iio_trigger_notify_done(indio_dev->trig);
 175
 176         return IRQ_HANDLED;
 177 }
 178
 179 /*
 180  * ad799x register access by I2C
 181  */
 182 static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
 183 {
 184         struct i2c_client *client = st->client;
 185         int ret = 0;
 186
 187         ret = i2c_smbus_read_word_swapped(client, reg);
 188         if (ret < 0) {
 189                 dev_err(&client->dev, "I2C read error\n");
 190                 return ret;
 191         }
 192
 193         *data = (u16)ret;
 194
 195         return 0;
 196 }
 197
 198 static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
 199 {
 200         struct i2c_client *client = st->client;
 201         int ret = 0;
 202
 203         ret = i2c_smbus_read_byte_data(client, reg);
 204         if (ret < 0) {
 205                 dev_err(&client->dev, "I2C read error\n");
 206                 return ret;
 207         }
 208
 209         *data = (u8)ret;
 210
 211         return 0;
 212 }
 213
 214 static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
 215 {
 216         struct i2c_client *client = st->client;
 217         int ret = 0;
 218
 219         ret = i2c_smbus_write_word_swapped(client, reg, data);
 220         if (ret < 0)
 221                 dev_err(&client->dev, "I2C write error\n");
 222
 223         return ret;
 224 }
 225
 226 static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
 227 {
 228         struct i2c_client *client = st->client;
 229         int ret = 0;
 230
 231         ret = i2c_smbus_write_byte_data(client, reg, data);
 232         if (ret < 0)
 233                 dev_err(&client->dev, "I2C write error\n");
 234
 235         return ret;
 236 }
 237
 238 static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
 239         const unsigned long *scan_mask)
 240 {
 241         struct ad799x_state *st = iio_priv(indio_dev);
 242
 243         kfree(st->rx_buf);
 244         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 245         if (!st->rx_buf)
 246                 return -ENOMEM;
 247
 248         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 249
 250         switch (st->id) {
 251         case ad7997:
 252         case ad7998:
 253                 return ad799x_i2c_write16(st, AD7998_CONF_REG,
 254                         st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
 255         default:
 256                 break;
 257         }
 258
 259         return 0;
 260 }
 261
 262 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 263 {
 264         u16 rxbuf;
 265         u8 cmd;
 266         int ret;
 267
 268         switch (st->id) {
 269         case ad7991:
 270         case ad7995:
 271         case ad7999:
 272                 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
 273                 break;
 274         case ad7992:
 275         case ad7993:
 276         case ad7994:
 277                 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
 278                 break;
 279         case ad7997:
 280         case ad7998:
 281                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 282                 break;
 283         default:
 284                 return -EINVAL;
 285         }
 286
 287         ret = ad799x_i2c_read16(st, cmd, &rxbuf);
 288         if (ret < 0)
 289                 return ret;
 290
 291         return rxbuf;
 292 }
 293
 294 static int ad799x_read_raw(struct iio_dev *indio_dev,
 295                            struct iio_chan_spec const *chan,
 296                            int *val,
 297                            int *val2,
 298                            long m)
 299 {
 300         int ret;
 301         struct ad799x_state *st = iio_priv(indio_dev);
 302
 303         switch (m) {
 304         case IIO_CHAN_INFO_RAW:
 305                 mutex_lock(&indio_dev->mlock);
 306                 if (iio_buffer_enabled(indio_dev))
 307                         ret = -EBUSY;
 308                 else
 309                         ret = ad799x_scan_direct(st, chan->scan_index);
 310                 mutex_unlock(&indio_dev->mlock);
 311
 312                 if (ret < 0)
 313                         return ret;
 314                 *val = (ret >> chan->scan_type.shift) &
 315                         RES_MASK(chan->scan_type.realbits);
 316                 return IIO_VAL_INT;
 317         case IIO_CHAN_INFO_SCALE:
 318                 ret = regulator_get_voltage(st->vref);
 319                 if (ret < 0)
 320                         return ret;
 321                 *val = ret / 1000;
 322                 *val2 = chan->scan_type.realbits;
 323                 return IIO_VAL_FRACTIONAL_LOG2;
 324         }
 325         return -EINVAL;
 326 }
 327 static const unsigned int ad7998_frequencies[] = {
 328         [AD7998_CYC_DIS]        = 0,
 329         [AD7998_CYC_TCONF_32]   = 15625,
 330         [AD7998_CYC_TCONF_64]   = 7812,
 331         [AD7998_CYC_TCONF_128]  = 3906,
 332         [AD7998_CYC_TCONF_512]  = 976,
 333         [AD7998_CYC_TCONF_1024] = 488,
 334         [AD7998_CYC_TCONF_2048] = 244,
 335 };
 336 static ssize_t ad799x_read_frequency(struct device *dev,
 337                                         struct device_attribute *attr,
 338                                         char *buf)
 339 {
 340         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 341         struct ad799x_state *st = iio_priv(indio_dev);
 342
 343         int ret;
 344         u8 val;
 345         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
 346         if (ret)
 347                 return ret;
 348
 349         val &= AD7998_CYC_MASK;
 350
 351         return sprintf(buf, "%u\n", ad7998_frequencies[val]);
 352 }
 353
 354 static ssize_t ad799x_write_frequency(struct device *dev,
 355                                          struct device_attribute *attr,
 356                                          const char *buf,
 357                                          size_t len)
 358 {
 359         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 360         struct ad799x_state *st = iio_priv(indio_dev);
 361
 362         long val;
 363         int ret, i;
 364         u8 t;
 365
 366         ret = kstrtol(buf, 10, &val);
 367         if (ret)
 368                 return ret;
 369
 370         mutex_lock(&indio_dev->mlock);
 371         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
 372         if (ret)
 373                 goto error_ret_mutex;
 374         /* Wipe the bits clean */
 375         t &= ~AD7998_CYC_MASK;
 376
 377         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 378                 if (val == ad7998_frequencies[i])
 379                         break;
 380         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 381                 ret = -EINVAL;
 382                 goto error_ret_mutex;
 383         }
 384         t |= i;
 385         ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
 386
 387 error_ret_mutex:
 388         mutex_unlock(&indio_dev->mlock);
 389
 390         return ret ? ret : len;
 391 }
 392
 393 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 394                                     const struct iio_chan_spec *chan,
 395                                     enum iio_event_type type,
 396                                     enum iio_event_direction dir)
 397 {
 398         return 1;
 399 }
 400
 401 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 402                                          enum iio_event_direction dir,
 403                                          enum iio_event_info info)
 404 {
 405         switch (info) {
 406         case IIO_EV_INFO_VALUE:
 407                 if (dir == IIO_EV_DIR_FALLING)
 408                         return AD7998_DATALOW_REG(chan->channel);
 409                 else
 410                         return AD7998_DATAHIGH_REG(chan->channel);
 411         case IIO_EV_INFO_HYSTERESIS:
 412                 return AD7998_HYST_REG(chan->channel);
 413         default:
 414                 return -EINVAL;
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 421                                     const struct iio_chan_spec *chan,
 422                                     enum iio_event_type type,
 423                                     enum iio_event_direction dir,
 424                                     enum iio_event_info info,
 425                                     int val, int val2)
 426 {
 427         int ret;
 428         struct ad799x_state *st = iio_priv(indio_dev);
 429
 430         mutex_lock(&indio_dev->mlock);
 431         ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
 432                 val);
 433         mutex_unlock(&indio_dev->mlock);
 434
 435         return ret;
 436 }
 437
 438 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 439                                     const struct iio_chan_spec *chan,
 440                                     enum iio_event_type type,
 441                                     enum iio_event_direction dir,
 442                                     enum iio_event_info info,
 443                                     int *val, int *val2)
 444 {
 445         int ret;
 446         struct ad799x_state *st = iio_priv(indio_dev);
 447         u16 valin;
 448
 449         mutex_lock(&indio_dev->mlock);
 450         ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
 451                 &valin);
 452         mutex_unlock(&indio_dev->mlock);
 453         if (ret < 0)
 454                 return ret;
 455         *val = valin;
 456
 457         return IIO_VAL_INT;
 458 }
 459
 460 static irqreturn_t ad799x_event_handler(int irq, void *private)
 461 {
 462         struct iio_dev *indio_dev = private;
 463         struct ad799x_state *st = iio_priv(private);
 464         u8 status;
 465         int i, ret;
 466
 467         ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
 468         if (ret)
 469                 goto done;
 470
 471         if (!status)
 472                 goto done;
 473
 474         ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
 475
 476         for (i = 0; i < 8; i++) {
 477                 if (status & (1 << i))
 478                         iio_push_event(indio_dev,
 479                                        i & 0x1 ?
 480                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 481                                                             (i >> 1),
 482                                                             IIO_EV_TYPE_THRESH,
 483                                                             IIO_EV_DIR_RISING) :
 484                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 485                                                             (i >> 1),
 486                                                             IIO_EV_TYPE_THRESH,
 487                                                             IIO_EV_DIR_FALLING),
 488                                        iio_get_time_ns());
 489         }
 490
 491 done:
 492         return IRQ_HANDLED;
 493 }
 494
 495 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 496                               ad799x_read_frequency,
 497                               ad799x_write_frequency);
 498 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 499
 500 static struct attribute *ad799x_event_attributes[] = {
 501         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 502         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 503         NULL,
 504 };
 505
 506 static struct attribute_group ad799x_event_attrs_group = {
 507         .attrs = ad799x_event_attributes,
 508         .name = "events",
 509 };
 510
 511 static const struct iio_info ad7991_info = {
 512         .read_raw = &ad799x_read_raw,
 513         .driver_module = THIS_MODULE,
 514 };
 515
 516 static const struct iio_info ad7993_4_7_8_info = {
 517         .read_raw = &ad799x_read_raw,
 518         .event_attrs = &ad799x_event_attrs_group,
 519         .read_event_config = &ad799x_read_event_config,
 520         .read_event_value = &ad799x_read_event_value,
 521         .write_event_value = &ad799x_write_event_value,
 522         .driver_module = THIS_MODULE,
 523         .update_scan_mode = ad7997_8_update_scan_mode,
 524 };
 525
 526 static const struct iio_event_spec ad799x_events[] = {
 527         {
 528                 .type = IIO_EV_TYPE_THRESH,
 529                 .dir = IIO_EV_DIR_RISING,
 530                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 531                         BIT(IIO_EV_INFO_ENABLE),
 532         }, {
 533                 .type = IIO_EV_TYPE_THRESH,
 534                 .dir = IIO_EV_DIR_FALLING,
 535                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 536                         BIT(IIO_EV_INFO_ENABLE),
 537         }, {
 538                 .type = IIO_EV_TYPE_THRESH,
 539                 .dir = IIO_EV_DIR_EITHER,
 540                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 541         },
 542 };
 543
 544 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 545         .type = IIO_VOLTAGE, \
 546         .indexed = 1, \
 547         .channel = (_index), \
 548         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 549         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 550         .scan_index = (_index), \
 551         .scan_type = { \
 552                 .sign = 'u', \
 553                 .realbits = (_realbits), \
 554                 .storagebits = 16, \
 555                 .shift = 12 - (_realbits), \
 556                 .endianness = IIO_BE, \
 557         }, \
 558         .event_spec = _ev_spec, \
 559         .num_event_specs = _num_ev_spec, \
 560 }
 561
 562 #define AD799X_CHANNEL(_index, _realbits) \
 563         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 564
 565 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 566         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 567                 ARRAY_SIZE(ad799x_events))
 568
 569 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 570         [ad7991] = {
 571                 .channel = {
 572                         AD799X_CHANNEL(0, 12),
 573                         AD799X_CHANNEL(1, 12),
 574                         AD799X_CHANNEL(2, 12),
 575                         AD799X_CHANNEL(3, 12),
 576                         IIO_CHAN_SOFT_TIMESTAMP(4),
 577                 },
 578                 .num_channels = 5,
 579                 .info = &ad7991_info,
 580         },
 581         [ad7995] = {
 582                 .channel = {
 583                         AD799X_CHANNEL(0, 10),
 584                         AD799X_CHANNEL(1, 10),
 585                         AD799X_CHANNEL(2, 10),
 586                         AD799X_CHANNEL(3, 10),
 587                         IIO_CHAN_SOFT_TIMESTAMP(4),
 588                 },
 589                 .num_channels = 5,
 590                 .info = &ad7991_info,
 591         },
 592         [ad7999] = {
 593                 .channel = {
 594                         AD799X_CHANNEL(0, 8),
 595                         AD799X_CHANNEL(1, 8),
 596                         AD799X_CHANNEL(2, 8),
 597                         AD799X_CHANNEL(3, 8),
 598                         IIO_CHAN_SOFT_TIMESTAMP(4),
 599                 },
 600                 .num_channels = 5,
 601                 .info = &ad7991_info,
 602         },
 603         [ad7992] = {
 604                 .channel = {
 605                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 606                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 607                         IIO_CHAN_SOFT_TIMESTAMP(3),
 608                 },
 609                 .num_channels = 3,
 610                 .default_config = AD7998_ALERT_EN,
 611                 .info = &ad7993_4_7_8_info,
 612         },
 613         [ad7993] = {
 614                 .channel = {
 615                         AD799X_CHANNEL_WITH_EVENTS(0, 10),
 616                         AD799X_CHANNEL_WITH_EVENTS(1, 10),
 617                         AD799X_CHANNEL_WITH_EVENTS(2, 10),
 618                         AD799X_CHANNEL_WITH_EVENTS(3, 10),
 619                         IIO_CHAN_SOFT_TIMESTAMP(4),
 620                 },
 621                 .num_channels = 5,
 622                 .default_config = AD7998_ALERT_EN,
 623                 .info = &ad7993_4_7_8_info,
 624         },
 625         [ad7994] = {
 626                 .channel = {
 627                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 628                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 629                         AD799X_CHANNEL_WITH_EVENTS(2, 12),
 630                         AD799X_CHANNEL_WITH_EVENTS(3, 12),
 631                         IIO_CHAN_SOFT_TIMESTAMP(4),
 632                 },
 633                 .num_channels = 5,
 634                 .default_config = AD7998_ALERT_EN,
 635                 .info = &ad7993_4_7_8_info,
 636         },
 637         [ad7997] = {
 638                 .channel = {
 639                         AD799X_CHANNEL_WITH_EVENTS(0, 10),
 640                         AD799X_CHANNEL_WITH_EVENTS(1, 10),
 641                         AD799X_CHANNEL_WITH_EVENTS(2, 10),
 642                         AD799X_CHANNEL_WITH_EVENTS(3, 10),
 643                         AD799X_CHANNEL(4, 10),
 644                         AD799X_CHANNEL(5, 10),
 645                         AD799X_CHANNEL(6, 10),
 646                         AD799X_CHANNEL(7, 10),
 647                         IIO_CHAN_SOFT_TIMESTAMP(8),
 648                 },
 649                 .num_channels = 9,
 650                 .default_config = AD7998_ALERT_EN,
 651                 .info = &ad7993_4_7_8_info,
 652         },
 653         [ad7998] = {
 654                 .channel = {
 655                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 656                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 657                         AD799X_CHANNEL_WITH_EVENTS(2, 12),
 658                         AD799X_CHANNEL_WITH_EVENTS(3, 12),
 659                         AD799X_CHANNEL(4, 12),
 660                         AD799X_CHANNEL(5, 12),
 661                         AD799X_CHANNEL(6, 12),
 662                         AD799X_CHANNEL(7, 12),
 663                         IIO_CHAN_SOFT_TIMESTAMP(8),
 664                 },
 665                 .num_channels = 9,
 666                 .default_config = AD7998_ALERT_EN,
 667                 .info = &ad7993_4_7_8_info,
 668         },
 669 };
 670
 671 static int ad799x_probe(struct i2c_client *client,
 672                                    const struct i2c_device_id *id)
 673 {
 674         int ret;
 675         struct ad799x_state *st;
 676         struct iio_dev *indio_dev;
 677
 678         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 679         if (indio_dev == NULL)
 680                 return -ENOMEM;
 681
 682         st = iio_priv(indio_dev);
 683         /* this is only used for device removal purposes */
 684         i2c_set_clientdata(client, indio_dev);
 685
 686         st->id = id->driver_data;
 687         st->chip_info = &ad799x_chip_info_tbl[st->id];
 688         st->config = st->chip_info->default_config;
 689
 690         /* TODO: Add pdata options for filtering and bit delay */
 691
 692         st->reg = devm_regulator_get(&client->dev, "vcc");
 693         if (IS_ERR(st->reg))
 694                 return PTR_ERR(st->reg);
 695         ret = regulator_enable(st->reg);
 696         if (ret)
 697                 return ret;
 698         st->vref = devm_regulator_get(&client->dev, "vref");
 699         if (IS_ERR(st->vref)) {
 700                 ret = PTR_ERR(st->vref);
 701                 goto error_disable_reg;
 702         }
 703         ret = regulator_enable(st->vref);
 704         if (ret)
 705                 goto error_disable_reg;
 706
 707         st->client = client;
 708
 709         indio_dev->dev.parent = &client->dev;
 710         indio_dev->name = id->name;
 711         indio_dev->info = st->chip_info->info;
 712
 713         indio_dev->modes = INDIO_DIRECT_MODE;
 714         indio_dev->channels = st->chip_info->channel;
 715         indio_dev->num_channels = st->chip_info->num_channels;
 716
 717         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 718                 &ad799x_trigger_handler, NULL);
 719         if (ret)
 720                 goto error_disable_vref;
 721
 722         if (client->irq > 0) {
 723                 ret = devm_request_threaded_irq(&client->dev,
 724                                                 client->irq,
 725                                                 NULL,
 726                                                 ad799x_event_handler,
 727                                                 IRQF_TRIGGER_FALLING |
 728                                                 IRQF_ONESHOT,
 729                                                 client->name,
 730                                                 indio_dev);
 731                 if (ret)
 732                         goto error_cleanup_ring;
 733         }
 734         ret = iio_device_register(indio_dev);
 735         if (ret)
 736                 goto error_cleanup_ring;
 737
 738         return 0;
 739
 740 error_cleanup_ring:
 741         iio_triggered_buffer_cleanup(indio_dev);
 742 error_disable_vref:
 743         regulator_disable(st->vref);
 744 error_disable_reg:
 745         regulator_disable(st->reg);
 746
 747         return ret;
 748 }
 749
 750 static int ad799x_remove(struct i2c_client *client)
 751 {
 752         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 753         struct ad799x_state *st = iio_priv(indio_dev);
 754
 755         iio_device_unregister(indio_dev);
 756
 757         iio_triggered_buffer_cleanup(indio_dev);
 758         regulator_disable(st->vref);
 759         regulator_disable(st->reg);
 760         kfree(st->rx_buf);
 761
 762         return 0;
 763 }
 764
 765 static const struct i2c_device_id ad799x_id[] = {
 766         { "ad7991", ad7991 },
 767         { "ad7995", ad7995 },
 768         { "ad7999", ad7999 },
 769         { "ad7992", ad7992 },
 770         { "ad7993", ad7993 },
 771         { "ad7994", ad7994 },
 772         { "ad7997", ad7997 },
 773         { "ad7998", ad7998 },
 774         {}
 775 };
 776
 777 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 778
 779 static struct i2c_driver ad799x_driver = {
 780         .driver = {
 781                 .name = "ad799x",
 782         },
 783         .probe = ad799x_probe,
 784         .remove = ad799x_remove,
 785         .id_table = ad799x_id,
 786 };
 787 module_i2c_driver(ad799x_driver);
 788
 789 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 790 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 791 MODULE_LICENSE("GPL v2");