drivers/staging/iio/adc/ad799x_core.c

   1 /*
   2  * iio/adc/ad799x.c
   3  * Copyright (C) 2010-1011 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
  41 #include "ad799x.h"
  42
  43 /*
  44  * ad799x register access by I2C
  45  */
  46 static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
  47 {
  48         struct i2c_client *client = st->client;
  49         int ret = 0;
  50
  51         ret = i2c_smbus_read_word_data(client, reg);
  52         if (ret < 0) {
  53                 dev_err(&client->dev, "I2C read error\n");
  54                 return ret;
  55         }
  56
  57         *data = swab16((u16)ret);
  58
  59         return 0;
  60 }
  61
  62 static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
  63 {
  64         struct i2c_client *client = st->client;
  65         int ret = 0;
  66
  67         ret = i2c_smbus_read_byte_data(client, reg);
  68         if (ret < 0) {
  69                 dev_err(&client->dev, "I2C read error\n");
  70                 return ret;
  71         }
  72
  73         *data = (u8)ret;
  74
  75         return 0;
  76 }
  77
  78 static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
  79 {
  80         struct i2c_client *client = st->client;
  81         int ret = 0;
  82
  83         ret = i2c_smbus_write_word_data(client, reg, swab16(data));
  84         if (ret < 0)
  85                 dev_err(&client->dev, "I2C write error\n");
  86
  87         return ret;
  88 }
  89
  90 static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
  91 {
  92         struct i2c_client *client = st->client;
  93         int ret = 0;
  94
  95         ret = i2c_smbus_write_byte_data(client, reg, data);
  96         if (ret < 0)
  97                 dev_err(&client->dev, "I2C write error\n");
  98
  99         return ret;
 100 }
 101
 102 static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
 103         const unsigned long *scan_mask)
 104 {
 105         struct ad799x_state *st = iio_priv(indio_dev);
 106
 107         switch (st->id) {
 108         case ad7997:
 109         case ad7998:
 110                 return ad799x_i2c_write16(st, AD7998_CONF_REG,
 111                         st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
 112         default:
 113                 break;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 120 {
 121         u16 rxbuf;
 122         u8 cmd;
 123         int ret;
 124
 125         switch (st->id) {
 126         case ad7991:
 127         case ad7995:
 128         case ad7999:
 129                 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
 130                 break;
 131         case ad7992:
 132         case ad7993:
 133         case ad7994:
 134                 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
 135                 break;
 136         case ad7997:
 137         case ad7998:
 138                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         ret = ad799x_i2c_read16(st, cmd, &rxbuf);
 145         if (ret < 0)
 146                 return ret;
 147
 148         return rxbuf;
 149 }
 150
 151 static int ad799x_read_raw(struct iio_dev *indio_dev,
 152                            struct iio_chan_spec const *chan,
 153                            int *val,
 154                            int *val2,
 155                            long m)
 156 {
 157         int ret;
 158         struct ad799x_state *st = iio_priv(indio_dev);
 159         unsigned int scale_uv;
 160
 161         switch (m) {
 162         case IIO_CHAN_INFO_RAW:
 163                 mutex_lock(&indio_dev->mlock);
 164                 if (iio_buffer_enabled(indio_dev))
 165                         ret = -EBUSY;
 166                 else
 167                         ret = ad799x_scan_direct(st, chan->scan_index);
 168                 mutex_unlock(&indio_dev->mlock);
 169
 170                 if (ret < 0)
 171                         return ret;
 172                 *val = (ret >> chan->scan_type.shift) &
 173                         RES_MASK(chan->scan_type.realbits);
 174                 return IIO_VAL_INT;
 175         case IIO_CHAN_INFO_SCALE:
 176                 scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
 177                 *val =  scale_uv / 1000;
 178                 *val2 = (scale_uv % 1000) * 1000;
 179                 return IIO_VAL_INT_PLUS_MICRO;
 180         }
 181         return -EINVAL;
 182 }
 183 static const unsigned int ad7998_frequencies[] = {
 184         [AD7998_CYC_DIS]        = 0,
 185         [AD7998_CYC_TCONF_32]   = 15625,
 186         [AD7998_CYC_TCONF_64]   = 7812,
 187         [AD7998_CYC_TCONF_128]  = 3906,
 188         [AD7998_CYC_TCONF_512]  = 976,
 189         [AD7998_CYC_TCONF_1024] = 488,
 190         [AD7998_CYC_TCONF_2048] = 244,
 191 };
 192 static ssize_t ad799x_read_frequency(struct device *dev,
 193                                         struct device_attribute *attr,
 194                                         char *buf)
 195 {
 196         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 197         struct ad799x_state *st = iio_priv(indio_dev);
 198
 199         int ret;
 200         u8 val;
 201         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
 202         if (ret)
 203                 return ret;
 204
 205         val &= AD7998_CYC_MASK;
 206
 207         return sprintf(buf, "%u\n", ad7998_frequencies[val]);
 208 }
 209
 210 static ssize_t ad799x_write_frequency(struct device *dev,
 211                                          struct device_attribute *attr,
 212                                          const char *buf,
 213                                          size_t len)
 214 {
 215         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 216         struct ad799x_state *st = iio_priv(indio_dev);
 217
 218         long val;
 219         int ret, i;
 220         u8 t;
 221
 222         ret = strict_strtol(buf, 10, &val);
 223         if (ret)
 224                 return ret;
 225
 226         mutex_lock(&indio_dev->mlock);
 227         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
 228         if (ret)
 229                 goto error_ret_mutex;
 230         /* Wipe the bits clean */
 231         t &= ~AD7998_CYC_MASK;
 232
 233         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 234                 if (val == ad7998_frequencies[i])
 235                         break;
 236         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 237                 ret = -EINVAL;
 238                 goto error_ret_mutex;
 239         }
 240         t |= i;
 241         ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
 242
 243 error_ret_mutex:
 244         mutex_unlock(&indio_dev->mlock);
 245
 246         return ret ? ret : len;
 247 }
 248
 249 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 250                                     u64 event_code)
 251 {
 252         return 1;
 253 }
 254
 255 static const u8 ad799x_threshold_addresses[][2] = {
 256         { AD7998_DATALOW_CH1_REG, AD7998_DATAHIGH_CH1_REG },
 257         { AD7998_DATALOW_CH2_REG, AD7998_DATAHIGH_CH2_REG },
 258         { AD7998_DATALOW_CH3_REG, AD7998_DATAHIGH_CH3_REG },
 259         { AD7998_DATALOW_CH4_REG, AD7998_DATAHIGH_CH4_REG },
 260 };
 261
 262 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 263                                     u64 event_code,
 264                                     int val)
 265 {
 266         int ret;
 267         struct ad799x_state *st = iio_priv(indio_dev);
 268         int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 269                            IIO_EV_DIR_FALLING);
 270         int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 271
 272         mutex_lock(&indio_dev->mlock);
 273         ret = ad799x_i2c_write16(st,
 274                                  ad799x_threshold_addresses[number][direction],
 275                                  val);
 276         mutex_unlock(&indio_dev->mlock);
 277
 278         return ret;
 279 }
 280
 281 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 282                                     u64 event_code,
 283                                     int *val)
 284 {
 285         int ret;
 286         struct ad799x_state *st = iio_priv(indio_dev);
 287         int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 288                            IIO_EV_DIR_FALLING);
 289         int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 290         u16 valin;
 291
 292         mutex_lock(&indio_dev->mlock);
 293         ret = ad799x_i2c_read16(st,
 294                                 ad799x_threshold_addresses[number][direction],
 295                                 &valin);
 296         mutex_unlock(&indio_dev->mlock);
 297         if (ret < 0)
 298                 return ret;
 299         *val = valin;
 300
 301         return 0;
 302 }
 303
 304 static ssize_t ad799x_read_channel_config(struct device *dev,
 305                                         struct device_attribute *attr,
 306                                         char *buf)
 307 {
 308         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 309         struct ad799x_state *st = iio_priv(indio_dev);
 310         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 311
 312         int ret;
 313         u16 val;
 314         ret = ad799x_i2c_read16(st, this_attr->address, &val);
 315         if (ret)
 316                 return ret;
 317
 318         return sprintf(buf, "%d\n", val);
 319 }
 320
 321 static ssize_t ad799x_write_channel_config(struct device *dev,
 322                                          struct device_attribute *attr,
 323                                          const char *buf,
 324                                          size_t len)
 325 {
 326         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 327         struct ad799x_state *st = iio_priv(indio_dev);
 328         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 329
 330         long val;
 331         int ret;
 332
 333         ret = strict_strtol(buf, 10, &val);
 334         if (ret)
 335                 return ret;
 336
 337         mutex_lock(&indio_dev->mlock);
 338         ret = ad799x_i2c_write16(st, this_attr->address, val);
 339         mutex_unlock(&indio_dev->mlock);
 340
 341         return ret ? ret : len;
 342 }
 343
 344 static irqreturn_t ad799x_event_handler(int irq, void *private)
 345 {
 346         struct iio_dev *indio_dev = private;
 347         struct ad799x_state *st = iio_priv(private);
 348         u8 status;
 349         int i, ret;
 350
 351         ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
 352         if (ret)
 353                 goto done;
 354
 355         if (!status)
 356                 goto done;
 357
 358         ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
 359
 360         for (i = 0; i < 8; i++) {
 361                 if (status & (1 << i))
 362                         iio_push_event(indio_dev,
 363                                        i & 0x1 ?
 364                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 365                                                             (i >> 1),
 366                                                             IIO_EV_TYPE_THRESH,
 367                                                             IIO_EV_DIR_RISING) :
 368                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 369                                                             (i >> 1),
 370                                                             IIO_EV_TYPE_THRESH,
 371                                                             IIO_EV_DIR_FALLING),
 372                                        iio_get_time_ns());
 373         }
 374
 375 done:
 376         return IRQ_HANDLED;
 377 }
 378
 379 static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw,
 380                        S_IRUGO | S_IWUSR,
 381                        ad799x_read_channel_config,
 382                        ad799x_write_channel_config,
 383                        AD7998_HYST_CH1_REG);
 384
 385 static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw,
 386                        S_IRUGO | S_IWUSR,
 387                        ad799x_read_channel_config,
 388                        ad799x_write_channel_config,
 389                        AD7998_HYST_CH2_REG);
 390
 391 static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw,
 392                        S_IRUGO | S_IWUSR,
 393                        ad799x_read_channel_config,
 394                        ad799x_write_channel_config,
 395                        AD7998_HYST_CH3_REG);
 396
 397 static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw,
 398                        S_IRUGO | S_IWUSR,
 399                        ad799x_read_channel_config,
 400                        ad799x_write_channel_config,
 401                        AD7998_HYST_CH4_REG);
 402
 403 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 404                               ad799x_read_frequency,
 405                               ad799x_write_frequency);
 406 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 407
 408 static struct attribute *ad7993_4_7_8_event_attributes[] = {
 409         &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
 410         &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
 411         &iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr,
 412         &iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr,
 413         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 414         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 415         NULL,
 416 };
 417
 418 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
 419         .attrs = ad7993_4_7_8_event_attributes,
 420         .name = "events",
 421 };
 422
 423 static struct attribute *ad7992_event_attributes[] = {
 424         &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
 425         &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
 426         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 427         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 428         NULL,
 429 };
 430
 431 static struct attribute_group ad7992_event_attrs_group = {
 432         .attrs = ad7992_event_attributes,
 433         .name = "events",
 434 };
 435
 436 static const struct iio_info ad7991_info = {
 437         .read_raw = &ad799x_read_raw,
 438         .driver_module = THIS_MODULE,
 439 };
 440
 441 static const struct iio_info ad7992_info = {
 442         .read_raw = &ad799x_read_raw,
 443         .event_attrs = &ad7992_event_attrs_group,
 444         .read_event_config = &ad799x_read_event_config,
 445         .read_event_value = &ad799x_read_event_value,
 446         .write_event_value = &ad799x_write_event_value,
 447         .driver_module = THIS_MODULE,
 448 };
 449
 450 static const struct iio_info ad7993_4_7_8_info = {
 451         .read_raw = &ad799x_read_raw,
 452         .event_attrs = &ad7993_4_7_8_event_attrs_group,
 453         .read_event_config = &ad799x_read_event_config,
 454         .read_event_value = &ad799x_read_event_value,
 455         .write_event_value = &ad799x_write_event_value,
 456         .driver_module = THIS_MODULE,
 457         .update_scan_mode = ad7997_8_update_scan_mode,
 458 };
 459
 460 #define AD799X_EV_MASK (IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | \
 461                         IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING))
 462
 463 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 464         [ad7991] = {
 465                 .channel = {
 466                         [0] = {
 467                                 .type = IIO_VOLTAGE,
 468                                 .indexed = 1,
 469                                 .channel = 0,
 470                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 471                                 .scan_index = 0,
 472                                 .scan_type = IIO_ST('u', 12, 16, 0),
 473                         },
 474                         [1] = {
 475                                 .type = IIO_VOLTAGE,
 476                                 .indexed = 1,
 477                                 .channel = 1,
 478                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 479                                 .scan_index = 1,
 480                                 .scan_type = IIO_ST('u', 12, 16, 0),
 481                         },
 482                         [2] = {
 483                                 .type = IIO_VOLTAGE,
 484                                 .indexed = 1,
 485                                 .channel = 2,
 486                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 487                                 .scan_index = 2,
 488                                 .scan_type = IIO_ST('u', 12, 16, 0),
 489                         },
 490                         [3] = {
 491                                 .type = IIO_VOLTAGE,
 492                                 .indexed = 1,
 493                                 .channel = 3,
 494                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 495                                 .scan_index = 3,
 496                                 .scan_type = IIO_ST('u', 12, 16, 0),
 497                         },
 498                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 499                 },
 500                 .num_channels = 5,
 501                 .int_vref_mv = 4096,
 502                 .info = &ad7991_info,
 503         },
 504         [ad7995] = {
 505                 .channel = {
 506                         [0] = {
 507                                 .type = IIO_VOLTAGE,
 508                                 .indexed = 1,
 509                                 .channel = 0,
 510                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 511                                 .scan_index = 0,
 512                                 .scan_type = IIO_ST('u', 10, 16, 2),
 513                         },
 514                         [1] = {
 515                                 .type = IIO_VOLTAGE,
 516                                 .indexed = 1,
 517                                 .channel = 1,
 518                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 519                                 .scan_index = 1,
 520                                 .scan_type = IIO_ST('u', 10, 16, 2),
 521                         },
 522                         [2] = {
 523                                 .type = IIO_VOLTAGE,
 524                                 .indexed = 1,
 525                                 .channel = 2,
 526                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 527                                 .scan_index = 2,
 528                                 .scan_type = IIO_ST('u', 10, 16, 2),
 529                         },
 530                         [3] = {
 531                                 .type = IIO_VOLTAGE,
 532                                 .indexed = 1,
 533                                 .channel = 3,
 534                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 535                                 .scan_index = 3,
 536                                 .scan_type = IIO_ST('u', 10, 16, 2),
 537                         },
 538                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 539                 },
 540                 .num_channels = 5,
 541                 .int_vref_mv = 1024,
 542                 .info = &ad7991_info,
 543         },
 544         [ad7999] = {
 545                 .channel = {
 546                         [0] = {
 547                                 .type = IIO_VOLTAGE,
 548                                 .indexed = 1,
 549                                 .channel = 0,
 550                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 551                                 .scan_index = 0,
 552                                 .scan_type = IIO_ST('u', 8, 16, 4),
 553                         },
 554                         [1] = {
 555                                 .type = IIO_VOLTAGE,
 556                                 .indexed = 1,
 557                                 .channel = 1,
 558                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 559                                 .scan_index = 1,
 560                                 .scan_type = IIO_ST('u', 8, 16, 4),
 561                         },
 562                         [2] = {
 563                                 .type = IIO_VOLTAGE,
 564                                 .indexed = 1,
 565                                 .channel = 2,
 566                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 567                                 .scan_index = 2,
 568                                 .scan_type = IIO_ST('u', 8, 16, 4),
 569                         },
 570                         [3] = {
 571                                 .type = IIO_VOLTAGE,
 572                                 .indexed = 1,
 573                                 .channel = 3,
 574                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 575                                 .scan_index = 3,
 576                                 .scan_type = IIO_ST('u', 8, 16, 4),
 577                         },
 578                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 579                 },
 580                 .num_channels = 5,
 581                 .int_vref_mv = 1024,
 582                 .info = &ad7991_info,
 583         },
 584         [ad7992] = {
 585                 .channel = {
 586                         [0] = {
 587                                 .type = IIO_VOLTAGE,
 588                                 .indexed = 1,
 589                                 .channel = 0,
 590                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 591                                 .scan_index = 0,
 592                                 .scan_type = IIO_ST('u', 12, 16, 0),
 593                                 .event_mask = AD799X_EV_MASK,
 594                         },
 595                         [1] = {
 596                                 .type = IIO_VOLTAGE,
 597                                 .indexed = 1,
 598                                 .channel = 1,
 599                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 600                                 .scan_index = 1,
 601                                 .scan_type = IIO_ST('u', 12, 16, 0),
 602                                 .event_mask = AD799X_EV_MASK,
 603                         },
 604                         [2] = IIO_CHAN_SOFT_TIMESTAMP(2),
 605                 },
 606                 .num_channels = 3,
 607                 .int_vref_mv = 4096,
 608                 .default_config = AD7998_ALERT_EN,
 609                 .info = &ad7992_info,
 610         },
 611         [ad7993] = {
 612                 .channel = {
 613                         [0] = {
 614                                 .type = IIO_VOLTAGE,
 615                                 .indexed = 1,
 616                                 .channel = 0,
 617                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 618                                 .scan_index = 0,
 619                                 .scan_type = IIO_ST('u', 10, 16, 2),
 620                                 .event_mask = AD799X_EV_MASK,
 621                         },
 622                         [1] = {
 623                                 .type = IIO_VOLTAGE,
 624                                 .indexed = 1,
 625                                 .channel = 1,
 626                                 .scan_index = 1,
 627                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 628                                 .scan_type = IIO_ST('u', 10, 16, 2),
 629                                 .event_mask = AD799X_EV_MASK,
 630                         },
 631                         [2] = {
 632                                 .type = IIO_VOLTAGE,
 633                                 .indexed = 1,
 634                                 .channel = 2,
 635                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 636                                 .scan_index = 2,
 637                                 .scan_type = IIO_ST('u', 10, 16, 2),
 638                                 .event_mask = AD799X_EV_MASK,
 639                         },
 640                         [3] = {
 641                                 .type = IIO_VOLTAGE,
 642                                 .indexed = 1,
 643                                 .channel = 3,
 644                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 645                                 .scan_index = 3,
 646                                 .scan_type = IIO_ST('u', 10, 16, 2),
 647                                 .event_mask = AD799X_EV_MASK,
 648                         },
 649                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 650                 },
 651                 .num_channels = 5,
 652                 .int_vref_mv = 1024,
 653                 .default_config = AD7998_ALERT_EN,
 654                 .info = &ad7993_4_7_8_info,
 655         },
 656         [ad7994] = {
 657                 .channel = {
 658                         [0] = {
 659                                 .type = IIO_VOLTAGE,
 660                                 .indexed = 1,
 661                                 .channel = 0,
 662                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 663                                 .scan_index = 0,
 664                                 .scan_type = IIO_ST('u', 12, 16, 0),
 665                                 .event_mask = AD799X_EV_MASK,
 666                         },
 667                         [1] = {
 668                                 .type = IIO_VOLTAGE,
 669                                 .indexed = 1,
 670                                 .channel = 1,
 671                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 672                                 .scan_index = 1,
 673                                 .scan_type = IIO_ST('u', 12, 16, 0),
 674                                 .event_mask = AD799X_EV_MASK,
 675                         },
 676                         [2] = {
 677                                 .type = IIO_VOLTAGE,
 678                                 .indexed = 1,
 679                                 .channel = 2,
 680                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 681                                 .scan_index = 2,
 682                                 .scan_type = IIO_ST('u', 12, 16, 0),
 683                                 .event_mask = AD799X_EV_MASK,
 684                         },
 685                         [3] = {
 686                                 .type = IIO_VOLTAGE,
 687                                 .indexed = 1,
 688                                 .channel = 3,
 689                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 690                                 .scan_index = 3,
 691                                 .scan_type = IIO_ST('u', 12, 16, 0),
 692                                 .event_mask = AD799X_EV_MASK,
 693                         },
 694                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 695                 },
 696                 .num_channels = 5,
 697                 .int_vref_mv = 4096,
 698                 .default_config = AD7998_ALERT_EN,
 699                 .info = &ad7993_4_7_8_info,
 700         },
 701         [ad7997] = {
 702                 .channel = {
 703                         [0] = {
 704                                 .type = IIO_VOLTAGE,
 705                                 .indexed = 1,
 706                                 .channel = 0,
 707                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 708                                 .scan_index = 0,
 709                                 .scan_type = IIO_ST('u', 10, 16, 2),
 710                                 .event_mask = AD799X_EV_MASK,
 711                         },
 712                         [1] = {
 713                                 .type = IIO_VOLTAGE,
 714                                 .indexed = 1,
 715                                 .channel = 1,
 716                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 717                                 .scan_index = 1,
 718                                 .scan_type = IIO_ST('u', 10, 16, 2),
 719                                 .event_mask = AD799X_EV_MASK,
 720                         },
 721                         [2] = {
 722                                 .type = IIO_VOLTAGE,
 723                                 .indexed = 1,
 724                                 .channel = 2,
 725                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 726                                 .scan_index = 2,
 727                                 .scan_type = IIO_ST('u', 10, 16, 2),
 728                                 .event_mask = AD799X_EV_MASK,
 729                         },
 730                         [3] = {
 731                                 .type = IIO_VOLTAGE,
 732                                 .indexed = 1,
 733                                 .channel = 3,
 734                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 735                                 .scan_index = 3,
 736                                 .scan_type = IIO_ST('u', 10, 16, 2),
 737                                 .event_mask = AD799X_EV_MASK,
 738                         },
 739                         [4] = {
 740                                 .type = IIO_VOLTAGE,
 741                                 .indexed = 1,
 742                                 .channel = 4,
 743                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 744                                 .scan_index = 4,
 745                                 .scan_type = IIO_ST('u', 10, 16, 2),
 746                         },
 747                         [5] = {
 748                                 .type = IIO_VOLTAGE,
 749                                 .indexed = 1,
 750                                 .channel = 5,
 751                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 752                                 .scan_index = 5,
 753                                 .scan_type = IIO_ST('u', 10, 16, 2),
 754                         },
 755                         [6] = {
 756                                 .type = IIO_VOLTAGE,
 757                                 .indexed = 1,
 758                                 .channel = 6,
 759                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 760                                 .scan_index = 6,
 761                                 .scan_type = IIO_ST('u', 10, 16, 2),
 762                         },
 763                         [7] = {
 764                                 .type = IIO_VOLTAGE,
 765                                 .indexed = 1,
 766                                 .channel = 7,
 767                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 768                                 .scan_index = 7,
 769                                 .scan_type = IIO_ST('u', 10, 16, 2),
 770                         },
 771                         [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 772                 },
 773                 .num_channels = 9,
 774                 .int_vref_mv = 1024,
 775                 .default_config = AD7998_ALERT_EN,
 776                 .info = &ad7993_4_7_8_info,
 777         },
 778         [ad7998] = {
 779                 .channel = {
 780                         [0] = {
 781                                 .type = IIO_VOLTAGE,
 782                                 .indexed = 1,
 783                                 .channel = 0,
 784                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 785                                 .scan_index = 0,
 786                                 .scan_type = IIO_ST('u', 12, 16, 0),
 787                                 .event_mask = AD799X_EV_MASK,
 788                         },
 789                         [1] = {
 790                                 .type = IIO_VOLTAGE,
 791                                 .indexed = 1,
 792                                 .channel = 1,
 793                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 794                                 .scan_index = 1,
 795                                 .scan_type = IIO_ST('u', 12, 16, 0),
 796                                 .event_mask = AD799X_EV_MASK,
 797                         },
 798                         [2] = {
 799                                 .type = IIO_VOLTAGE,
 800                                 .indexed = 1,
 801                                 .channel = 2,
 802                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 803                                 .scan_index = 2,
 804                                 .scan_type = IIO_ST('u', 12, 16, 0),
 805                                 .event_mask = AD799X_EV_MASK,
 806                         },
 807                         [3] = {
 808                                 .type = IIO_VOLTAGE,
 809                                 .indexed = 1,
 810                                 .channel = 3,
 811                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 812                                 .scan_index = 3,
 813                                 .scan_type = IIO_ST('u', 12, 16, 0),
 814                                 .event_mask = AD799X_EV_MASK,
 815                         },
 816                         [4] = {
 817                                 .type = IIO_VOLTAGE,
 818                                 .indexed = 1,
 819                                 .channel = 4,
 820                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 821                                 .scan_index = 4,
 822                                 .scan_type = IIO_ST('u', 12, 16, 0),
 823                         },
 824                         [5] = {
 825                                 .type = IIO_VOLTAGE,
 826                                 .indexed = 1,
 827                                 .channel = 5,
 828                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 829                                 .scan_index = 5,
 830                                 .scan_type = IIO_ST('u', 12, 16, 0),
 831                         },
 832                         [6] = {
 833                                 .type = IIO_VOLTAGE,
 834                                 .indexed = 1,
 835                                 .channel = 6,
 836                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 837                                 .scan_index = 6,
 838                                 .scan_type = IIO_ST('u', 12, 16, 0),
 839                         },
 840                         [7] = {
 841                                 .type = IIO_VOLTAGE,
 842                                 .indexed = 1,
 843                                 .channel = 7,
 844                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 845                                 .scan_index = 7,
 846                                 .scan_type = IIO_ST('u', 12, 16, 0),
 847                         },
 848                         [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 849                 },
 850                 .num_channels = 9,
 851                 .int_vref_mv = 4096,
 852                 .default_config = AD7998_ALERT_EN,
 853                 .info = &ad7993_4_7_8_info,
 854         },
 855 };
 856
 857 static int ad799x_probe(struct i2c_client *client,
 858                                    const struct i2c_device_id *id)
 859 {
 860         int ret;
 861         struct ad799x_platform_data *pdata = client->dev.platform_data;
 862         struct ad799x_state *st;
 863         struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
 864
 865         if (indio_dev == NULL)
 866                 return -ENOMEM;
 867
 868         st = iio_priv(indio_dev);
 869         /* this is only used for device removal purposes */
 870         i2c_set_clientdata(client, indio_dev);
 871
 872         st->id = id->driver_data;
 873         st->chip_info = &ad799x_chip_info_tbl[st->id];
 874         st->config = st->chip_info->default_config;
 875
 876         /* TODO: Add pdata options for filtering and bit delay */
 877
 878         if (pdata)
 879                 st->int_vref_mv = pdata->vref_mv;
 880         else
 881                 st->int_vref_mv = st->chip_info->int_vref_mv;
 882
 883         st->reg = regulator_get(&client->dev, "vcc");
 884         if (!IS_ERR(st->reg)) {
 885                 ret = regulator_enable(st->reg);
 886                 if (ret)
 887                         goto error_put_reg;
 888         }
 889         st->client = client;
 890
 891         indio_dev->dev.parent = &client->dev;
 892         indio_dev->name = id->name;
 893         indio_dev->info = st->chip_info->info;
 894
 895         indio_dev->modes = INDIO_DIRECT_MODE;
 896         indio_dev->channels = st->chip_info->channel;
 897         indio_dev->num_channels = st->chip_info->num_channels;
 898
 899         ret = ad799x_register_ring_funcs_and_init(indio_dev);
 900         if (ret)
 901                 goto error_disable_reg;
 902
 903         if (client->irq > 0) {
 904                 ret = request_threaded_irq(client->irq,
 905                                            NULL,
 906                                            ad799x_event_handler,
 907                                            IRQF_TRIGGER_FALLING |
 908                                            IRQF_ONESHOT,
 909                                            client->name,
 910                                            indio_dev);
 911                 if (ret)
 912                         goto error_cleanup_ring;
 913         }
 914         ret = iio_device_register(indio_dev);
 915         if (ret)
 916                 goto error_free_irq;
 917
 918         return 0;
 919
 920 error_free_irq:
 921         free_irq(client->irq, indio_dev);
 922 error_cleanup_ring:
 923         ad799x_ring_cleanup(indio_dev);
 924 error_disable_reg:
 925         if (!IS_ERR(st->reg))
 926                 regulator_disable(st->reg);
 927 error_put_reg:
 928         if (!IS_ERR(st->reg))
 929                 regulator_put(st->reg);
 930         iio_device_free(indio_dev);
 931
 932         return ret;
 933 }
 934
 935 static int ad799x_remove(struct i2c_client *client)
 936 {
 937         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 938         struct ad799x_state *st = iio_priv(indio_dev);
 939
 940         iio_device_unregister(indio_dev);
 941         if (client->irq > 0)
 942                 free_irq(client->irq, indio_dev);
 943
 944         ad799x_ring_cleanup(indio_dev);
 945         if (!IS_ERR(st->reg)) {
 946                 regulator_disable(st->reg);
 947                 regulator_put(st->reg);
 948         }
 949         iio_device_free(indio_dev);
 950
 951         return 0;
 952 }
 953
 954 static const struct i2c_device_id ad799x_id[] = {
 955         { "ad7991", ad7991 },
 956         { "ad7995", ad7995 },
 957         { "ad7999", ad7999 },
 958         { "ad7992", ad7992 },
 959         { "ad7993", ad7993 },
 960         { "ad7994", ad7994 },
 961         { "ad7997", ad7997 },
 962         { "ad7998", ad7998 },
 963         {}
 964 };
 965
 966 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 967
 968 static struct i2c_driver ad799x_driver = {
 969         .driver = {
 970                 .name = "ad799x",
 971         },
 972         .probe = ad799x_probe,
 973         .remove = ad799x_remove,
 974         .id_table = ad799x_id,
 975 };
 976 module_i2c_driver(ad799x_driver);
 977
 978 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 979 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 980 MODULE_LICENSE("GPL v2");