kernel/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());
 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                 mutex_lock(&indio_dev->mlock);
 286                 if (iio_buffer_enabled(indio_dev))
 287                         ret = -EBUSY;
 288                 else
 289                         ret = ad799x_scan_direct(st, chan->scan_index);
 290                 mutex_unlock(&indio_dev->mlock);
 291
 292                 if (ret < 0)
 293                         return ret;
 294                 *val = (ret >> chan->scan_type.shift) &
 295                         GENMASK(chan->scan_type.realbits - 1, 0);
 296                 return IIO_VAL_INT;
 297         case IIO_CHAN_INFO_SCALE:
 298                 ret = regulator_get_voltage(st->vref);
 299                 if (ret < 0)
 300                         return ret;
 301                 *val = ret / 1000;
 302                 *val2 = chan->scan_type.realbits;
 303                 return IIO_VAL_FRACTIONAL_LOG2;
 304         }
 305         return -EINVAL;
 306 }
 307 static const unsigned int ad7998_frequencies[] = {
 308         [AD7998_CYC_DIS]        = 0,
 309         [AD7998_CYC_TCONF_32]   = 15625,
 310         [AD7998_CYC_TCONF_64]   = 7812,
 311         [AD7998_CYC_TCONF_128]  = 3906,
 312         [AD7998_CYC_TCONF_512]  = 976,
 313         [AD7998_CYC_TCONF_1024] = 488,
 314         [AD7998_CYC_TCONF_2048] = 244,
 315 };
 316
 317 static ssize_t ad799x_read_frequency(struct device *dev,
 318                                         struct device_attribute *attr,
 319                                         char *buf)
 320 {
 321         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 322         struct ad799x_state *st = iio_priv(indio_dev);
 323
 324         int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 325         if (ret < 0)
 326                 return ret;
 327
 328         return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 329 }
 330
 331 static ssize_t ad799x_write_frequency(struct device *dev,
 332                                          struct device_attribute *attr,
 333                                          const char *buf,
 334                                          size_t len)
 335 {
 336         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 337         struct ad799x_state *st = iio_priv(indio_dev);
 338
 339         long val;
 340         int ret, i;
 341
 342         ret = kstrtol(buf, 10, &val);
 343         if (ret)
 344                 return ret;
 345
 346         mutex_lock(&indio_dev->mlock);
 347         ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
 348         if (ret < 0)
 349                 goto error_ret_mutex;
 350         /* Wipe the bits clean */
 351         ret &= ~AD7998_CYC_MASK;
 352
 353         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 354                 if (val == ad7998_frequencies[i])
 355                         break;
 356         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 357                 ret = -EINVAL;
 358                 goto error_ret_mutex;
 359         }
 360
 361         ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
 362                 ret | i);
 363         if (ret < 0)
 364                 goto error_ret_mutex;
 365         ret = len;
 366
 367 error_ret_mutex:
 368         mutex_unlock(&indio_dev->mlock);
 369
 370         return ret;
 371 }
 372
 373 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 374                                     const struct iio_chan_spec *chan,
 375                                     enum iio_event_type type,
 376                                     enum iio_event_direction dir)
 377 {
 378         struct ad799x_state *st = iio_priv(indio_dev);
 379
 380         if (!(st->config & AD7998_ALERT_EN))
 381                 return 0;
 382
 383         if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
 384                 return 1;
 385
 386         return 0;
 387 }
 388
 389 static int ad799x_write_event_config(struct iio_dev *indio_dev,
 390                                      const struct iio_chan_spec *chan,
 391                                      enum iio_event_type type,
 392                                      enum iio_event_direction dir,
 393                                      int state)
 394 {
 395         struct ad799x_state *st = iio_priv(indio_dev);
 396         int ret;
 397
 398         mutex_lock(&indio_dev->mlock);
 399         if (iio_buffer_enabled(indio_dev)) {
 400                 ret = -EBUSY;
 401                 goto done;
 402         }
 403
 404         if (state)
 405                 st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
 406         else
 407                 st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
 408
 409         if (st->config >> AD799X_CHANNEL_SHIFT)
 410                 st->config |= AD7998_ALERT_EN;
 411         else
 412                 st->config &= ~AD7998_ALERT_EN;
 413
 414         ret = ad799x_write_config(st, st->config);
 415
 416 done:
 417         mutex_unlock(&indio_dev->mlock);
 418
 419         return ret;
 420 }
 421
 422 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 423                                          enum iio_event_direction dir,
 424                                          enum iio_event_info info)
 425 {
 426         switch (info) {
 427         case IIO_EV_INFO_VALUE:
 428                 if (dir == IIO_EV_DIR_FALLING)
 429                         return AD7998_DATALOW_REG(chan->channel);
 430                 else
 431                         return AD7998_DATAHIGH_REG(chan->channel);
 432         case IIO_EV_INFO_HYSTERESIS:
 433                 return AD7998_HYST_REG(chan->channel);
 434         default:
 435                 return -EINVAL;
 436         }
 437
 438         return 0;
 439 }
 440
 441 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 442                                     const struct iio_chan_spec *chan,
 443                                     enum iio_event_type type,
 444                                     enum iio_event_direction dir,
 445                                     enum iio_event_info info,
 446                                     int val, int val2)
 447 {
 448         int ret;
 449         struct ad799x_state *st = iio_priv(indio_dev);
 450
 451         if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
 452                 return -EINVAL;
 453
 454         mutex_lock(&indio_dev->mlock);
 455         ret = i2c_smbus_write_word_swapped(st->client,
 456                 ad799x_threshold_reg(chan, dir, info),
 457                 val << chan->scan_type.shift);
 458         mutex_unlock(&indio_dev->mlock);
 459
 460         return ret;
 461 }
 462
 463 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 464                                     const struct iio_chan_spec *chan,
 465                                     enum iio_event_type type,
 466                                     enum iio_event_direction dir,
 467                                     enum iio_event_info info,
 468                                     int *val, int *val2)
 469 {
 470         int ret;
 471         struct ad799x_state *st = iio_priv(indio_dev);
 472
 473         mutex_lock(&indio_dev->mlock);
 474         ret = i2c_smbus_read_word_swapped(st->client,
 475                 ad799x_threshold_reg(chan, dir, info));
 476         mutex_unlock(&indio_dev->mlock);
 477         if (ret < 0)
 478                 return ret;
 479         *val = (ret >> chan->scan_type.shift) &
 480                 GENMASK(chan->scan_type.realbits - 1 , 0);
 481
 482         return IIO_VAL_INT;
 483 }
 484
 485 static irqreturn_t ad799x_event_handler(int irq, void *private)
 486 {
 487         struct iio_dev *indio_dev = private;
 488         struct ad799x_state *st = iio_priv(private);
 489         int i, ret;
 490
 491         ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
 492         if (ret <= 0)
 493                 goto done;
 494
 495         if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
 496                 AD7998_ALERT_STAT_CLEAR) < 0)
 497                 goto done;
 498
 499         for (i = 0; i < 8; i++) {
 500                 if (ret & BIT(i))
 501                         iio_push_event(indio_dev,
 502                                        i & 0x1 ?
 503                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 504                                                             (i >> 1),
 505                                                             IIO_EV_TYPE_THRESH,
 506                                                             IIO_EV_DIR_RISING) :
 507                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 508                                                             (i >> 1),
 509                                                             IIO_EV_TYPE_THRESH,
 510                                                             IIO_EV_DIR_FALLING),
 511                                        iio_get_time_ns());
 512         }
 513
 514 done:
 515         return IRQ_HANDLED;
 516 }
 517
 518 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 519                               ad799x_read_frequency,
 520                               ad799x_write_frequency);
 521 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 522
 523 static struct attribute *ad799x_event_attributes[] = {
 524         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 525         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 526         NULL,
 527 };
 528
 529 static struct attribute_group ad799x_event_attrs_group = {
 530         .attrs = ad799x_event_attributes,
 531 };
 532
 533 static const struct iio_info ad7991_info = {
 534         .read_raw = &ad799x_read_raw,
 535         .driver_module = THIS_MODULE,
 536 };
 537
 538 static const struct iio_info ad7993_4_7_8_noirq_info = {
 539         .read_raw = &ad799x_read_raw,
 540         .driver_module = THIS_MODULE,
 541         .update_scan_mode = ad799x_update_scan_mode,
 542 };
 543
 544 static const struct iio_info ad7993_4_7_8_irq_info = {
 545         .read_raw = &ad799x_read_raw,
 546         .event_attrs = &ad799x_event_attrs_group,
 547         .read_event_config = &ad799x_read_event_config,
 548         .write_event_config = &ad799x_write_event_config,
 549         .read_event_value = &ad799x_read_event_value,
 550         .write_event_value = &ad799x_write_event_value,
 551         .driver_module = THIS_MODULE,
 552         .update_scan_mode = ad799x_update_scan_mode,
 553 };
 554
 555 static const struct iio_event_spec ad799x_events[] = {
 556         {
 557                 .type = IIO_EV_TYPE_THRESH,
 558                 .dir = IIO_EV_DIR_RISING,
 559                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 560                         BIT(IIO_EV_INFO_ENABLE),
 561         }, {
 562                 .type = IIO_EV_TYPE_THRESH,
 563                 .dir = IIO_EV_DIR_FALLING,
 564                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 565                         BIT(IIO_EV_INFO_ENABLE),
 566         }, {
 567                 .type = IIO_EV_TYPE_THRESH,
 568                 .dir = IIO_EV_DIR_EITHER,
 569                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 570         },
 571 };
 572
 573 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 574         .type = IIO_VOLTAGE, \
 575         .indexed = 1, \
 576         .channel = (_index), \
 577         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 578         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 579         .scan_index = (_index), \
 580         .scan_type = { \
 581                 .sign = 'u', \
 582                 .realbits = (_realbits), \
 583                 .storagebits = 16, \
 584                 .shift = 12 - (_realbits), \
 585                 .endianness = IIO_BE, \
 586         }, \
 587         .event_spec = _ev_spec, \
 588         .num_event_specs = _num_ev_spec, \
 589 }
 590
 591 #define AD799X_CHANNEL(_index, _realbits) \
 592         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 593
 594 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 595         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 596                 ARRAY_SIZE(ad799x_events))
 597
 598 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 599         [ad7991] = {
 600                 .num_channels = 5,
 601                 .noirq_config = {
 602                         .channel = {
 603                                 AD799X_CHANNEL(0, 12),
 604                                 AD799X_CHANNEL(1, 12),
 605                                 AD799X_CHANNEL(2, 12),
 606                                 AD799X_CHANNEL(3, 12),
 607                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 608                         },
 609                         .info = &ad7991_info,
 610                 },
 611         },
 612         [ad7995] = {
 613                 .num_channels = 5,
 614                 .noirq_config = {
 615                         .channel = {
 616                                 AD799X_CHANNEL(0, 10),
 617                                 AD799X_CHANNEL(1, 10),
 618                                 AD799X_CHANNEL(2, 10),
 619                                 AD799X_CHANNEL(3, 10),
 620                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 621                         },
 622                         .info = &ad7991_info,
 623                 },
 624         },
 625         [ad7999] = {
 626                 .num_channels = 5,
 627                 .noirq_config = {
 628                         .channel = {
 629                                 AD799X_CHANNEL(0, 8),
 630                                 AD799X_CHANNEL(1, 8),
 631                                 AD799X_CHANNEL(2, 8),
 632                                 AD799X_CHANNEL(3, 8),
 633                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 634                         },
 635                         .info = &ad7991_info,
 636                 },
 637         },
 638         [ad7992] = {
 639                 .num_channels = 3,
 640                 .noirq_config = {
 641                         .channel = {
 642                                 AD799X_CHANNEL(0, 12),
 643                                 AD799X_CHANNEL(1, 12),
 644                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 645                         },
 646                         .info = &ad7993_4_7_8_noirq_info,
 647                 },
 648                 .irq_config = {
 649                         .channel = {
 650                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 651                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 652                                 IIO_CHAN_SOFT_TIMESTAMP(3),
 653                         },
 654                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 655                         .info = &ad7993_4_7_8_irq_info,
 656                 },
 657         },
 658         [ad7993] = {
 659                 .num_channels = 5,
 660                 .noirq_config = {
 661                         .channel = {
 662                                 AD799X_CHANNEL(0, 10),
 663                                 AD799X_CHANNEL(1, 10),
 664                                 AD799X_CHANNEL(2, 10),
 665                                 AD799X_CHANNEL(3, 10),
 666                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 667                         },
 668                         .info = &ad7993_4_7_8_noirq_info,
 669                 },
 670                 .irq_config = {
 671                         .channel = {
 672                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 673                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 674                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 675                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 676                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 677                         },
 678                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 679                         .info = &ad7993_4_7_8_irq_info,
 680                 },
 681         },
 682         [ad7994] = {
 683                 .num_channels = 5,
 684                 .noirq_config = {
 685                         .channel = {
 686                                 AD799X_CHANNEL(0, 12),
 687                                 AD799X_CHANNEL(1, 12),
 688                                 AD799X_CHANNEL(2, 12),
 689                                 AD799X_CHANNEL(3, 12),
 690                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 691                         },
 692                         .info = &ad7993_4_7_8_noirq_info,
 693                 },
 694                 .irq_config = {
 695                         .channel = {
 696                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 697                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 698                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 699                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 700                                 IIO_CHAN_SOFT_TIMESTAMP(4),
 701                         },
 702                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 703                         .info = &ad7993_4_7_8_irq_info,
 704                 },
 705         },
 706         [ad7997] = {
 707                 .num_channels = 9,
 708                 .noirq_config = {
 709                         .channel = {
 710                                 AD799X_CHANNEL(0, 10),
 711                                 AD799X_CHANNEL(1, 10),
 712                                 AD799X_CHANNEL(2, 10),
 713                                 AD799X_CHANNEL(3, 10),
 714                                 AD799X_CHANNEL(4, 10),
 715                                 AD799X_CHANNEL(5, 10),
 716                                 AD799X_CHANNEL(6, 10),
 717                                 AD799X_CHANNEL(7, 10),
 718                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 719                         },
 720                         .info = &ad7993_4_7_8_noirq_info,
 721                 },
 722                 .irq_config = {
 723                         .channel = {
 724                                 AD799X_CHANNEL_WITH_EVENTS(0, 10),
 725                                 AD799X_CHANNEL_WITH_EVENTS(1, 10),
 726                                 AD799X_CHANNEL_WITH_EVENTS(2, 10),
 727                                 AD799X_CHANNEL_WITH_EVENTS(3, 10),
 728                                 AD799X_CHANNEL(4, 10),
 729                                 AD799X_CHANNEL(5, 10),
 730                                 AD799X_CHANNEL(6, 10),
 731                                 AD799X_CHANNEL(7, 10),
 732                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 733                         },
 734                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 735                         .info = &ad7993_4_7_8_irq_info,
 736                 },
 737         },
 738         [ad7998] = {
 739                 .num_channels = 9,
 740                 .noirq_config = {
 741                         .channel = {
 742                                 AD799X_CHANNEL(0, 12),
 743                                 AD799X_CHANNEL(1, 12),
 744                                 AD799X_CHANNEL(2, 12),
 745                                 AD799X_CHANNEL(3, 12),
 746                                 AD799X_CHANNEL(4, 12),
 747                                 AD799X_CHANNEL(5, 12),
 748                                 AD799X_CHANNEL(6, 12),
 749                                 AD799X_CHANNEL(7, 12),
 750                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 751                         },
 752                         .info = &ad7993_4_7_8_noirq_info,
 753                 },
 754                 .irq_config = {
 755                         .channel = {
 756                                 AD799X_CHANNEL_WITH_EVENTS(0, 12),
 757                                 AD799X_CHANNEL_WITH_EVENTS(1, 12),
 758                                 AD799X_CHANNEL_WITH_EVENTS(2, 12),
 759                                 AD799X_CHANNEL_WITH_EVENTS(3, 12),
 760                                 AD799X_CHANNEL(4, 12),
 761                                 AD799X_CHANNEL(5, 12),
 762                                 AD799X_CHANNEL(6, 12),
 763                                 AD799X_CHANNEL(7, 12),
 764                                 IIO_CHAN_SOFT_TIMESTAMP(8),
 765                         },
 766                         .default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
 767                         .info = &ad7993_4_7_8_irq_info,
 768                 },
 769         },
 770 };
 771
 772 static int ad799x_probe(struct i2c_client *client,
 773                                    const struct i2c_device_id *id)
 774 {
 775         int ret;
 776         struct ad799x_state *st;
 777         struct iio_dev *indio_dev;
 778         const struct ad799x_chip_info *chip_info =
 779                 &ad799x_chip_info_tbl[id->driver_data];
 780
 781         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 782         if (indio_dev == NULL)
 783                 return -ENOMEM;
 784
 785         st = iio_priv(indio_dev);
 786         /* this is only used for device removal purposes */
 787         i2c_set_clientdata(client, indio_dev);
 788
 789         st->id = id->driver_data;
 790         if (client->irq > 0 && chip_info->irq_config.info)
 791                 st->chip_config = &chip_info->irq_config;
 792         else
 793                 st->chip_config = &chip_info->noirq_config;
 794
 795         /* TODO: Add pdata options for filtering and bit delay */
 796
 797         st->reg = devm_regulator_get(&client->dev, "vcc");
 798         if (IS_ERR(st->reg))
 799                 return PTR_ERR(st->reg);
 800         ret = regulator_enable(st->reg);
 801         if (ret)
 802                 return ret;
 803         st->vref = devm_regulator_get(&client->dev, "vref");
 804         if (IS_ERR(st->vref)) {
 805                 ret = PTR_ERR(st->vref);
 806                 goto error_disable_reg;
 807         }
 808         ret = regulator_enable(st->vref);
 809         if (ret)
 810                 goto error_disable_reg;
 811
 812         st->client = client;
 813
 814         indio_dev->dev.parent = &client->dev;
 815         indio_dev->name = id->name;
 816         indio_dev->info = st->chip_config->info;
 817
 818         indio_dev->modes = INDIO_DIRECT_MODE;
 819         indio_dev->channels = st->chip_config->channel;
 820         indio_dev->num_channels = chip_info->num_channels;
 821
 822         ret = ad799x_write_config(st, st->chip_config->default_config);
 823         if (ret < 0)
 824                 goto error_disable_reg;
 825         ret = ad799x_read_config(st);
 826         if (ret < 0)
 827                 goto error_disable_reg;
 828         st->config = ret;
 829
 830         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 831                 &ad799x_trigger_handler, NULL);
 832         if (ret)
 833                 goto error_disable_vref;
 834
 835         if (client->irq > 0) {
 836                 ret = devm_request_threaded_irq(&client->dev,
 837                                                 client->irq,
 838                                                 NULL,
 839                                                 ad799x_event_handler,
 840                                                 IRQF_TRIGGER_FALLING |
 841                                                 IRQF_ONESHOT,
 842                                                 client->name,
 843                                                 indio_dev);
 844                 if (ret)
 845                         goto error_cleanup_ring;
 846         }
 847         ret = iio_device_register(indio_dev);
 848         if (ret)
 849                 goto error_cleanup_ring;
 850
 851         return 0;
 852
 853 error_cleanup_ring:
 854         iio_triggered_buffer_cleanup(indio_dev);
 855 error_disable_vref:
 856         regulator_disable(st->vref);
 857 error_disable_reg:
 858         regulator_disable(st->reg);
 859
 860         return ret;
 861 }
 862
 863 static int ad799x_remove(struct i2c_client *client)
 864 {
 865         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 866         struct ad799x_state *st = iio_priv(indio_dev);
 867
 868         iio_device_unregister(indio_dev);
 869
 870         iio_triggered_buffer_cleanup(indio_dev);
 871         regulator_disable(st->vref);
 872         regulator_disable(st->reg);
 873         kfree(st->rx_buf);
 874
 875         return 0;
 876 }
 877
 878 static const struct i2c_device_id ad799x_id[] = {
 879         { "ad7991", ad7991 },
 880         { "ad7995", ad7995 },
 881         { "ad7999", ad7999 },
 882         { "ad7992", ad7992 },
 883         { "ad7993", ad7993 },
 884         { "ad7994", ad7994 },
 885         { "ad7997", ad7997 },
 886         { "ad7998", ad7998 },
 887         {}
 888 };
 889
 890 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 891
 892 static struct i2c_driver ad799x_driver = {
 893         .driver = {
 894                 .name = "ad799x",
 895         },
 896         .probe = ad799x_probe,
 897         .remove = ad799x_remove,
 898         .id_table = ad799x_id,
 899 };
 900 module_i2c_driver(ad799x_driver);
 901
 902 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 903 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 904 MODULE_LICENSE("GPL v2");