Pileus Git - ~andy/linux/blob - 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 int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
 103 {
 104         return ad799x_i2c_write16(st, AD7998_CONF_REG,
 105                 st->config | (mask << AD799X_CHANNEL_SHIFT));
 106 }
 107
 108 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 109 {
 110         u16 rxbuf;
 111         u8 cmd;
 112         int ret;
 113
 114         switch (st->id) {
 115         case ad7991:
 116         case ad7995:
 117         case ad7999:
 118                 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
 119                 break;
 120         case ad7992:
 121         case ad7993:
 122         case ad7994:
 123                 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
 124                 break;
 125         case ad7997:
 126         case ad7998:
 127                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132
 133         ret = ad799x_i2c_read16(st, cmd, &rxbuf);
 134         if (ret < 0)
 135                 return ret;
 136
 137         return rxbuf;
 138 }
 139
 140 static int ad799x_read_raw(struct iio_dev *indio_dev,
 141                            struct iio_chan_spec const *chan,
 142                            int *val,
 143                            int *val2,
 144                            long m)
 145 {
 146         int ret;
 147         struct ad799x_state *st = iio_priv(indio_dev);
 148         unsigned int scale_uv;
 149
 150         switch (m) {
 151         case IIO_CHAN_INFO_RAW:
 152                 mutex_lock(&indio_dev->mlock);
 153                 if (iio_buffer_enabled(indio_dev))
 154                         ret = -EBUSY;
 155                 else
 156                         ret = ad799x_scan_direct(st, chan->scan_index);
 157                 mutex_unlock(&indio_dev->mlock);
 158
 159                 if (ret < 0)
 160                         return ret;
 161                 *val = (ret >> chan->scan_type.shift) &
 162                         RES_MASK(chan->scan_type.realbits);
 163                 return IIO_VAL_INT;
 164         case IIO_CHAN_INFO_SCALE:
 165                 scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
 166                 *val =  scale_uv / 1000;
 167                 *val2 = (scale_uv % 1000) * 1000;
 168                 return IIO_VAL_INT_PLUS_MICRO;
 169         }
 170         return -EINVAL;
 171 }
 172 static const unsigned int ad7998_frequencies[] = {
 173         [AD7998_CYC_DIS]        = 0,
 174         [AD7998_CYC_TCONF_32]   = 15625,
 175         [AD7998_CYC_TCONF_64]   = 7812,
 176         [AD7998_CYC_TCONF_128]  = 3906,
 177         [AD7998_CYC_TCONF_512]  = 976,
 178         [AD7998_CYC_TCONF_1024] = 488,
 179         [AD7998_CYC_TCONF_2048] = 244,
 180 };
 181 static ssize_t ad799x_read_frequency(struct device *dev,
 182                                         struct device_attribute *attr,
 183                                         char *buf)
 184 {
 185         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 186         struct ad799x_state *st = iio_priv(indio_dev);
 187
 188         int ret;
 189         u8 val;
 190         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
 191         if (ret)
 192                 return ret;
 193
 194         val &= AD7998_CYC_MASK;
 195
 196         return sprintf(buf, "%u\n", ad7998_frequencies[val]);
 197 }
 198
 199 static ssize_t ad799x_write_frequency(struct device *dev,
 200                                          struct device_attribute *attr,
 201                                          const char *buf,
 202                                          size_t len)
 203 {
 204         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 205         struct ad799x_state *st = iio_priv(indio_dev);
 206
 207         long val;
 208         int ret, i;
 209         u8 t;
 210
 211         ret = strict_strtol(buf, 10, &val);
 212         if (ret)
 213                 return ret;
 214
 215         mutex_lock(&indio_dev->mlock);
 216         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
 217         if (ret)
 218                 goto error_ret_mutex;
 219         /* Wipe the bits clean */
 220         t &= ~AD7998_CYC_MASK;
 221
 222         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 223                 if (val == ad7998_frequencies[i])
 224                         break;
 225         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 226                 ret = -EINVAL;
 227                 goto error_ret_mutex;
 228         }
 229         t |= i;
 230         ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
 231
 232 error_ret_mutex:
 233         mutex_unlock(&indio_dev->mlock);
 234
 235         return ret ? ret : len;
 236 }
 237
 238 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 239                                     u64 event_code)
 240 {
 241         return 1;
 242 }
 243
 244 static const u8 ad799x_threshold_addresses[][2] = {
 245         { AD7998_DATALOW_CH1_REG, AD7998_DATAHIGH_CH1_REG },
 246         { AD7998_DATALOW_CH2_REG, AD7998_DATAHIGH_CH2_REG },
 247         { AD7998_DATALOW_CH3_REG, AD7998_DATAHIGH_CH3_REG },
 248         { AD7998_DATALOW_CH4_REG, AD7998_DATAHIGH_CH4_REG },
 249 };
 250
 251 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 252                                     u64 event_code,
 253                                     int val)
 254 {
 255         int ret;
 256         struct ad799x_state *st = iio_priv(indio_dev);
 257         int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 258                            IIO_EV_DIR_FALLING);
 259         int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 260
 261         mutex_lock(&indio_dev->mlock);
 262         ret = ad799x_i2c_write16(st,
 263                                  ad799x_threshold_addresses[number][direction],
 264                                  val);
 265         mutex_unlock(&indio_dev->mlock);
 266
 267         return ret;
 268 }
 269
 270 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 271                                     u64 event_code,
 272                                     int *val)
 273 {
 274         int ret;
 275         struct ad799x_state *st = iio_priv(indio_dev);
 276         int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
 277                            IIO_EV_DIR_FALLING);
 278         int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
 279         u16 valin;
 280
 281         mutex_lock(&indio_dev->mlock);
 282         ret = ad799x_i2c_read16(st,
 283                                 ad799x_threshold_addresses[number][direction],
 284                                 &valin);
 285         mutex_unlock(&indio_dev->mlock);
 286         if (ret < 0)
 287                 return ret;
 288         *val = valin;
 289
 290         return 0;
 291 }
 292
 293 static ssize_t ad799x_read_channel_config(struct device *dev,
 294                                         struct device_attribute *attr,
 295                                         char *buf)
 296 {
 297         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 298         struct ad799x_state *st = iio_priv(indio_dev);
 299         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 300
 301         int ret;
 302         u16 val;
 303         ret = ad799x_i2c_read16(st, this_attr->address, &val);
 304         if (ret)
 305                 return ret;
 306
 307         return sprintf(buf, "%d\n", val);
 308 }
 309
 310 static ssize_t ad799x_write_channel_config(struct device *dev,
 311                                          struct device_attribute *attr,
 312                                          const char *buf,
 313                                          size_t len)
 314 {
 315         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 316         struct ad799x_state *st = iio_priv(indio_dev);
 317         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 318
 319         long val;
 320         int ret;
 321
 322         ret = strict_strtol(buf, 10, &val);
 323         if (ret)
 324                 return ret;
 325
 326         mutex_lock(&indio_dev->mlock);
 327         ret = ad799x_i2c_write16(st, this_attr->address, val);
 328         mutex_unlock(&indio_dev->mlock);
 329
 330         return ret ? ret : len;
 331 }
 332
 333 static irqreturn_t ad799x_event_handler(int irq, void *private)
 334 {
 335         struct iio_dev *indio_dev = private;
 336         struct ad799x_state *st = iio_priv(private);
 337         u8 status;
 338         int i, ret;
 339
 340         ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
 341         if (ret)
 342                 return ret;
 343
 344         if (!status)
 345                 return -EIO;
 346
 347         ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
 348
 349         for (i = 0; i < 8; i++) {
 350                 if (status & (1 << i))
 351                         iio_push_event(indio_dev,
 352                                        i & 0x1 ?
 353                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 354                                                             (i >> 1),
 355                                                             IIO_EV_TYPE_THRESH,
 356                                                             IIO_EV_DIR_RISING) :
 357                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 358                                                             (i >> 1),
 359                                                             IIO_EV_TYPE_THRESH,
 360                                                             IIO_EV_DIR_FALLING),
 361                                        iio_get_time_ns());
 362         }
 363
 364         return IRQ_HANDLED;
 365 }
 366
 367 static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw,
 368                        S_IRUGO | S_IWUSR,
 369                        ad799x_read_channel_config,
 370                        ad799x_write_channel_config,
 371                        AD7998_HYST_CH1_REG);
 372
 373 static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw,
 374                        S_IRUGO | S_IWUSR,
 375                        ad799x_read_channel_config,
 376                        ad799x_write_channel_config,
 377                        AD7998_HYST_CH2_REG);
 378
 379 static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw,
 380                        S_IRUGO | S_IWUSR,
 381                        ad799x_read_channel_config,
 382                        ad799x_write_channel_config,
 383                        AD7998_HYST_CH3_REG);
 384
 385 static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw,
 386                        S_IRUGO | S_IWUSR,
 387                        ad799x_read_channel_config,
 388                        ad799x_write_channel_config,
 389                        AD7998_HYST_CH4_REG);
 390
 391 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 392                               ad799x_read_frequency,
 393                               ad799x_write_frequency);
 394 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 395
 396 static struct attribute *ad7993_4_7_8_event_attributes[] = {
 397         &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
 398         &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
 399         &iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr,
 400         &iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr,
 401         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 402         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 403         NULL,
 404 };
 405
 406 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
 407         .attrs = ad7993_4_7_8_event_attributes,
 408         .name = "events",
 409 };
 410
 411 static struct attribute *ad7992_event_attributes[] = {
 412         &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
 413         &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
 414         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 415         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 416         NULL,
 417 };
 418
 419 static struct attribute_group ad7992_event_attrs_group = {
 420         .attrs = ad7992_event_attributes,
 421         .name = "events",
 422 };
 423
 424 static const struct iio_info ad7991_info = {
 425         .read_raw = &ad799x_read_raw,
 426         .driver_module = THIS_MODULE,
 427 };
 428
 429 static const struct iio_info ad7992_info = {
 430         .read_raw = &ad799x_read_raw,
 431         .event_attrs = &ad7992_event_attrs_group,
 432         .read_event_config = &ad799x_read_event_config,
 433         .read_event_value = &ad799x_read_event_value,
 434         .write_event_value = &ad799x_write_event_value,
 435         .driver_module = THIS_MODULE,
 436 };
 437
 438 static const struct iio_info ad7993_4_7_8_info = {
 439         .read_raw = &ad799x_read_raw,
 440         .event_attrs = &ad7993_4_7_8_event_attrs_group,
 441         .read_event_config = &ad799x_read_event_config,
 442         .read_event_value = &ad799x_read_event_value,
 443         .write_event_value = &ad799x_write_event_value,
 444         .driver_module = THIS_MODULE,
 445 };
 446
 447 #define AD799X_EV_MASK (IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | \
 448                         IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING))
 449
 450 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 451         [ad7991] = {
 452                 .channel = {
 453                         [0] = {
 454                                 .type = IIO_VOLTAGE,
 455                                 .indexed = 1,
 456                                 .channel = 0,
 457                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 458                                 .scan_index = 0,
 459                                 .scan_type = IIO_ST('u', 12, 16, 0),
 460                         },
 461                         [1] = {
 462                                 .type = IIO_VOLTAGE,
 463                                 .indexed = 1,
 464                                 .channel = 1,
 465                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 466                                 .scan_index = 1,
 467                                 .scan_type = IIO_ST('u', 12, 16, 0),
 468                         },
 469                         [2] = {
 470                                 .type = IIO_VOLTAGE,
 471                                 .indexed = 1,
 472                                 .channel = 2,
 473                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 474                                 .scan_index = 2,
 475                                 .scan_type = IIO_ST('u', 12, 16, 0),
 476                         },
 477                         [3] = {
 478                                 .type = IIO_VOLTAGE,
 479                                 .indexed = 1,
 480                                 .channel = 3,
 481                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 482                                 .scan_index = 3,
 483                                 .scan_type = IIO_ST('u', 12, 16, 0),
 484                         },
 485                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 486                 },
 487                 .num_channels = 5,
 488                 .int_vref_mv = 4096,
 489                 .info = &ad7991_info,
 490         },
 491         [ad7995] = {
 492                 .channel = {
 493                         [0] = {
 494                                 .type = IIO_VOLTAGE,
 495                                 .indexed = 1,
 496                                 .channel = 0,
 497                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 498                                 .scan_index = 0,
 499                                 .scan_type = IIO_ST('u', 10, 16, 2),
 500                         },
 501                         [1] = {
 502                                 .type = IIO_VOLTAGE,
 503                                 .indexed = 1,
 504                                 .channel = 1,
 505                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 506                                 .scan_index = 1,
 507                                 .scan_type = IIO_ST('u', 10, 16, 2),
 508                         },
 509                         [2] = {
 510                                 .type = IIO_VOLTAGE,
 511                                 .indexed = 1,
 512                                 .channel = 2,
 513                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 514                                 .scan_index = 2,
 515                                 .scan_type = IIO_ST('u', 10, 16, 2),
 516                         },
 517                         [3] = {
 518                                 .type = IIO_VOLTAGE,
 519                                 .indexed = 1,
 520                                 .channel = 3,
 521                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 522                                 .scan_index = 3,
 523                                 .scan_type = IIO_ST('u', 10, 16, 2),
 524                         },
 525                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 526                 },
 527                 .num_channels = 5,
 528                 .int_vref_mv = 1024,
 529                 .info = &ad7991_info,
 530         },
 531         [ad7999] = {
 532                 .channel = {
 533                         [0] = {
 534                                 .type = IIO_VOLTAGE,
 535                                 .indexed = 1,
 536                                 .channel = 0,
 537                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 538                                 .scan_index = 0,
 539                                 .scan_type = IIO_ST('u', 8, 16, 4),
 540                         },
 541                         [1] = {
 542                                 .type = IIO_VOLTAGE,
 543                                 .indexed = 1,
 544                                 .channel = 1,
 545                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 546                                 .scan_index = 1,
 547                                 .scan_type = IIO_ST('u', 8, 16, 4),
 548                         },
 549                         [2] = {
 550                                 .type = IIO_VOLTAGE,
 551                                 .indexed = 1,
 552                                 .channel = 2,
 553                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 554                                 .scan_index = 2,
 555                                 .scan_type = IIO_ST('u', 8, 16, 4),
 556                         },
 557                         [3] = {
 558                                 .type = IIO_VOLTAGE,
 559                                 .indexed = 1,
 560                                 .channel = 3,
 561                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 562                                 .scan_index = 3,
 563                                 .scan_type = IIO_ST('u', 8, 16, 4),
 564                         },
 565                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 566                 },
 567                 .num_channels = 5,
 568                 .int_vref_mv = 1024,
 569                 .info = &ad7991_info,
 570         },
 571         [ad7992] = {
 572                 .channel = {
 573                         [0] = {
 574                                 .type = IIO_VOLTAGE,
 575                                 .indexed = 1,
 576                                 .channel = 0,
 577                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 578                                 .scan_index = 0,
 579                                 .scan_type = IIO_ST('u', 12, 16, 0),
 580                                 .event_mask = AD799X_EV_MASK,
 581                         },
 582                         [1] = {
 583                                 .type = IIO_VOLTAGE,
 584                                 .indexed = 1,
 585                                 .channel = 1,
 586                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 587                                 .scan_index = 1,
 588                                 .scan_type = IIO_ST('u', 12, 16, 0),
 589                                 .event_mask = AD799X_EV_MASK,
 590                         },
 591                         [2] = IIO_CHAN_SOFT_TIMESTAMP(2),
 592                 },
 593                 .num_channels = 3,
 594                 .int_vref_mv = 4096,
 595                 .default_config = AD7998_ALERT_EN,
 596                 .info = &ad7992_info,
 597         },
 598         [ad7993] = {
 599                 .channel = {
 600                         [0] = {
 601                                 .type = IIO_VOLTAGE,
 602                                 .indexed = 1,
 603                                 .channel = 0,
 604                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 605                                 .scan_index = 0,
 606                                 .scan_type = IIO_ST('u', 10, 16, 2),
 607                                 .event_mask = AD799X_EV_MASK,
 608                         },
 609                         [1] = {
 610                                 .type = IIO_VOLTAGE,
 611                                 .indexed = 1,
 612                                 .channel = 1,
 613                                 .scan_index = 1,
 614                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 615                                 .scan_type = IIO_ST('u', 10, 16, 2),
 616                                 .event_mask = AD799X_EV_MASK,
 617                         },
 618                         [2] = {
 619                                 .type = IIO_VOLTAGE,
 620                                 .indexed = 1,
 621                                 .channel = 2,
 622                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 623                                 .scan_index = 2,
 624                                 .scan_type = IIO_ST('u', 10, 16, 2),
 625                                 .event_mask = AD799X_EV_MASK,
 626                         },
 627                         [3] = {
 628                                 .type = IIO_VOLTAGE,
 629                                 .indexed = 1,
 630                                 .channel = 3,
 631                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 632                                 .scan_index = 3,
 633                                 .scan_type = IIO_ST('u', 10, 16, 2),
 634                                 .event_mask = AD799X_EV_MASK,
 635                         },
 636                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 637                 },
 638                 .num_channels = 5,
 639                 .int_vref_mv = 1024,
 640                 .default_config = AD7998_ALERT_EN,
 641                 .info = &ad7993_4_7_8_info,
 642         },
 643         [ad7994] = {
 644                 .channel = {
 645                         [0] = {
 646                                 .type = IIO_VOLTAGE,
 647                                 .indexed = 1,
 648                                 .channel = 0,
 649                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 650                                 .scan_index = 0,
 651                                 .scan_type = IIO_ST('u', 12, 16, 0),
 652                                 .event_mask = AD799X_EV_MASK,
 653                         },
 654                         [1] = {
 655                                 .type = IIO_VOLTAGE,
 656                                 .indexed = 1,
 657                                 .channel = 1,
 658                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 659                                 .scan_index = 1,
 660                                 .scan_type = IIO_ST('u', 12, 16, 0),
 661                                 .event_mask = AD799X_EV_MASK,
 662                         },
 663                         [2] = {
 664                                 .type = IIO_VOLTAGE,
 665                                 .indexed = 1,
 666                                 .channel = 2,
 667                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 668                                 .scan_index = 2,
 669                                 .scan_type = IIO_ST('u', 12, 16, 0),
 670                                 .event_mask = AD799X_EV_MASK,
 671                         },
 672                         [3] = {
 673                                 .type = IIO_VOLTAGE,
 674                                 .indexed = 1,
 675                                 .channel = 3,
 676                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 677                                 .scan_index = 3,
 678                                 .scan_type = IIO_ST('u', 12, 16, 0),
 679                                 .event_mask = AD799X_EV_MASK,
 680                         },
 681                         [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 682                 },
 683                 .num_channels = 5,
 684                 .int_vref_mv = 4096,
 685                 .default_config = AD7998_ALERT_EN,
 686                 .info = &ad7993_4_7_8_info,
 687         },
 688         [ad7997] = {
 689                 .channel = {
 690                         [0] = {
 691                                 .type = IIO_VOLTAGE,
 692                                 .indexed = 1,
 693                                 .channel = 0,
 694                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 695                                 .scan_index = 0,
 696                                 .scan_type = IIO_ST('u', 10, 16, 2),
 697                                 .event_mask = AD799X_EV_MASK,
 698                         },
 699                         [1] = {
 700                                 .type = IIO_VOLTAGE,
 701                                 .indexed = 1,
 702                                 .channel = 1,
 703                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 704                                 .scan_index = 1,
 705                                 .scan_type = IIO_ST('u', 10, 16, 2),
 706                                 .event_mask = AD799X_EV_MASK,
 707                         },
 708                         [2] = {
 709                                 .type = IIO_VOLTAGE,
 710                                 .indexed = 1,
 711                                 .channel = 2,
 712                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 713                                 .scan_index = 2,
 714                                 .scan_type = IIO_ST('u', 10, 16, 2),
 715                                 .event_mask = AD799X_EV_MASK,
 716                         },
 717                         [3] = {
 718                                 .type = IIO_VOLTAGE,
 719                                 .indexed = 1,
 720                                 .channel = 3,
 721                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 722                                 .scan_index = 3,
 723                                 .scan_type = IIO_ST('u', 10, 16, 2),
 724                                 .event_mask = AD799X_EV_MASK,
 725                         },
 726                         [4] = {
 727                                 .type = IIO_VOLTAGE,
 728                                 .indexed = 1,
 729                                 .channel = 4,
 730                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 731                                 .scan_index = 4,
 732                                 .scan_type = IIO_ST('u', 10, 16, 2),
 733                         },
 734                         [5] = {
 735                                 .type = IIO_VOLTAGE,
 736                                 .indexed = 1,
 737                                 .channel = 5,
 738                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 739                                 .scan_index = 5,
 740                                 .scan_type = IIO_ST('u', 10, 16, 2),
 741                         },
 742                         [6] = {
 743                                 .type = IIO_VOLTAGE,
 744                                 .indexed = 1,
 745                                 .channel = 6,
 746                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 747                                 .scan_index = 6,
 748                                 .scan_type = IIO_ST('u', 10, 16, 2),
 749                         },
 750                         [7] = {
 751                                 .type = IIO_VOLTAGE,
 752                                 .indexed = 1,
 753                                 .channel = 7,
 754                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 755                                 .scan_index = 7,
 756                                 .scan_type = IIO_ST('u', 10, 16, 2),
 757                         },
 758                         [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 759                 },
 760                 .num_channels = 9,
 761                 .int_vref_mv = 1024,
 762                 .default_config = AD7998_ALERT_EN,
 763                 .info = &ad7993_4_7_8_info,
 764         },
 765         [ad7998] = {
 766                 .channel = {
 767                         [0] = {
 768                                 .type = IIO_VOLTAGE,
 769                                 .indexed = 1,
 770                                 .channel = 0,
 771                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 772                                 .scan_index = 0,
 773                                 .scan_type = IIO_ST('u', 12, 16, 0),
 774                                 .event_mask = AD799X_EV_MASK,
 775                         },
 776                         [1] = {
 777                                 .type = IIO_VOLTAGE,
 778                                 .indexed = 1,
 779                                 .channel = 1,
 780                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 781                                 .scan_index = 1,
 782                                 .scan_type = IIO_ST('u', 12, 16, 0),
 783                                 .event_mask = AD799X_EV_MASK,
 784                         },
 785                         [2] = {
 786                                 .type = IIO_VOLTAGE,
 787                                 .indexed = 1,
 788                                 .channel = 2,
 789                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 790                                 .scan_index = 2,
 791                                 .scan_type = IIO_ST('u', 12, 16, 0),
 792                                 .event_mask = AD799X_EV_MASK,
 793                         },
 794                         [3] = {
 795                                 .type = IIO_VOLTAGE,
 796                                 .indexed = 1,
 797                                 .channel = 3,
 798                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 799                                 .scan_index = 3,
 800                                 .scan_type = IIO_ST('u', 12, 16, 0),
 801                                 .event_mask = AD799X_EV_MASK,
 802                         },
 803                         [4] = {
 804                                 .type = IIO_VOLTAGE,
 805                                 .indexed = 1,
 806                                 .channel = 4,
 807                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 808                                 .scan_index = 4,
 809                                 .scan_type = IIO_ST('u', 12, 16, 0),
 810                         },
 811                         [5] = {
 812                                 .type = IIO_VOLTAGE,
 813                                 .indexed = 1,
 814                                 .channel = 5,
 815                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 816                                 .scan_index = 5,
 817                                 .scan_type = IIO_ST('u', 12, 16, 0),
 818                         },
 819                         [6] = {
 820                                 .type = IIO_VOLTAGE,
 821                                 .indexed = 1,
 822                                 .channel = 6,
 823                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 824                                 .scan_index = 6,
 825                                 .scan_type = IIO_ST('u', 12, 16, 0),
 826                         },
 827                         [7] = {
 828                                 .type = IIO_VOLTAGE,
 829                                 .indexed = 1,
 830                                 .channel = 7,
 831                                 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
 832                                 .scan_index = 7,
 833                                 .scan_type = IIO_ST('u', 12, 16, 0),
 834                         },
 835                         [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 836                 },
 837                 .num_channels = 9,
 838                 .int_vref_mv = 4096,
 839                 .default_config = AD7998_ALERT_EN,
 840                 .info = &ad7993_4_7_8_info,
 841         },
 842 };
 843
 844 static int __devinit ad799x_probe(struct i2c_client *client,
 845                                    const struct i2c_device_id *id)
 846 {
 847         int ret;
 848         struct ad799x_platform_data *pdata = client->dev.platform_data;
 849         struct ad799x_state *st;
 850         struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
 851
 852         if (indio_dev == NULL)
 853                 return -ENOMEM;
 854
 855         st = iio_priv(indio_dev);
 856         /* this is only used for device removal purposes */
 857         i2c_set_clientdata(client, indio_dev);
 858
 859         st->id = id->driver_data;
 860         st->chip_info = &ad799x_chip_info_tbl[st->id];
 861         st->config = st->chip_info->default_config;
 862
 863         /* TODO: Add pdata options for filtering and bit delay */
 864
 865         if (pdata)
 866                 st->int_vref_mv = pdata->vref_mv;
 867         else
 868                 st->int_vref_mv = st->chip_info->int_vref_mv;
 869
 870         st->reg = regulator_get(&client->dev, "vcc");
 871         if (!IS_ERR(st->reg)) {
 872                 ret = regulator_enable(st->reg);
 873                 if (ret)
 874                         goto error_put_reg;
 875         }
 876         st->client = client;
 877
 878         indio_dev->dev.parent = &client->dev;
 879         indio_dev->name = id->name;
 880         indio_dev->info = st->chip_info->info;
 881
 882         indio_dev->modes = INDIO_DIRECT_MODE;
 883         indio_dev->channels = st->chip_info->channel;
 884         indio_dev->num_channels = st->chip_info->num_channels;
 885
 886         ret = ad799x_register_ring_funcs_and_init(indio_dev);
 887         if (ret)
 888                 goto error_disable_reg;
 889
 890         ret = iio_buffer_register(indio_dev,
 891                                   indio_dev->channels,
 892                                   indio_dev->num_channels);
 893         if (ret)
 894                 goto error_cleanup_ring;
 895
 896         if (client->irq > 0) {
 897                 ret = request_threaded_irq(client->irq,
 898                                            NULL,
 899                                            ad799x_event_handler,
 900                                            IRQF_TRIGGER_FALLING |
 901                                            IRQF_ONESHOT,
 902                                            client->name,
 903                                            indio_dev);
 904                 if (ret)
 905                         goto error_cleanup_ring;
 906         }
 907         ret = iio_device_register(indio_dev);
 908         if (ret)
 909                 goto error_free_irq;
 910
 911         return 0;
 912
 913 error_free_irq:
 914         free_irq(client->irq, indio_dev);
 915 error_cleanup_ring:
 916         ad799x_ring_cleanup(indio_dev);
 917 error_disable_reg:
 918         if (!IS_ERR(st->reg))
 919                 regulator_disable(st->reg);
 920 error_put_reg:
 921         if (!IS_ERR(st->reg))
 922                 regulator_put(st->reg);
 923         iio_device_free(indio_dev);
 924
 925         return ret;
 926 }
 927
 928 static __devexit int ad799x_remove(struct i2c_client *client)
 929 {
 930         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 931         struct ad799x_state *st = iio_priv(indio_dev);
 932
 933         iio_device_unregister(indio_dev);
 934         if (client->irq > 0)
 935                 free_irq(client->irq, indio_dev);
 936
 937         iio_buffer_unregister(indio_dev);
 938         ad799x_ring_cleanup(indio_dev);
 939         if (!IS_ERR(st->reg)) {
 940                 regulator_disable(st->reg);
 941                 regulator_put(st->reg);
 942         }
 943         iio_device_free(indio_dev);
 944
 945         return 0;
 946 }
 947
 948 static const struct i2c_device_id ad799x_id[] = {
 949         { "ad7991", ad7991 },
 950         { "ad7995", ad7995 },
 951         { "ad7999", ad7999 },
 952         { "ad7992", ad7992 },
 953         { "ad7993", ad7993 },
 954         { "ad7994", ad7994 },
 955         { "ad7997", ad7997 },
 956         { "ad7998", ad7998 },
 957         {}
 958 };
 959
 960 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 961
 962 static struct i2c_driver ad799x_driver = {
 963         .driver = {
 964                 .name = "ad799x",
 965         },
 966         .probe = ad799x_probe,
 967         .remove = __devexit_p(ad799x_remove),
 968         .id_table = ad799x_id,
 969 };
 970 module_i2c_driver(ad799x_driver);
 971
 972 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 973 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 974 MODULE_LICENSE("GPL v2");