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 "../iio.h"
  37 #include "../sysfs.h"
  38 #include "../ring_generic.h"
  39
  40 #include "ad799x.h"
  41
  42 /*
  43  * ad799x register access by I2C
  44  */
  45 static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
  46 {
  47         struct i2c_client *client = st->client;
  48         int ret = 0;
  49
  50         ret = i2c_smbus_read_word_data(client, reg);
  51         if (ret < 0) {
  52                 dev_err(&client->dev, "I2C read error\n");
  53                 return ret;
  54         }
  55
  56         *data = swab16((u16)ret);
  57
  58         return 0;
  59 }
  60
  61 static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
  62 {
  63         struct i2c_client *client = st->client;
  64         int ret = 0;
  65
  66         ret = i2c_smbus_read_byte_data(client, reg);
  67         if (ret < 0) {
  68                 dev_err(&client->dev, "I2C read error\n");
  69                 return ret;
  70         }
  71
  72         *data = (u8)ret;
  73
  74         return 0;
  75 }
  76
  77 static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
  78 {
  79         struct i2c_client *client = st->client;
  80         int ret = 0;
  81
  82         ret = i2c_smbus_write_word_data(client, reg, swab16(data));
  83         if (ret < 0)
  84                 dev_err(&client->dev, "I2C write error\n");
  85
  86         return ret;
  87 }
  88
  89 static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
  90 {
  91         struct i2c_client *client = st->client;
  92         int ret = 0;
  93
  94         ret = i2c_smbus_write_byte_data(client, reg, data);
  95         if (ret < 0)
  96                 dev_err(&client->dev, "I2C write error\n");
  97
  98         return ret;
  99 }
 100
 101 int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
 102 {
 103         return ad799x_i2c_write16(st, AD7998_CONF_REG,
 104                 st->config | (mask << AD799X_CHANNEL_SHIFT));
 105 }
 106
 107 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 108 {
 109         u16 rxbuf;
 110         u8 cmd;
 111         int ret;
 112
 113         switch (st->id) {
 114         case ad7991:
 115         case ad7995:
 116         case ad7999:
 117                 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
 118                 break;
 119         case ad7992:
 120         case ad7993:
 121         case ad7994:
 122                 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
 123                 break;
 124         case ad7997:
 125         case ad7998:
 126                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 127                 break;
 128         default:
 129                 return -EINVAL;
 130         }
 131
 132         ret = ad799x_i2c_read16(st, cmd, &rxbuf);
 133         if (ret < 0)
 134                 return ret;
 135
 136         return rxbuf;
 137 }
 138
 139 static int ad799x_read_raw(struct iio_dev *dev_info,
 140                            struct iio_chan_spec const *chan,
 141                            int *val,
 142                            int *val2,
 143                            long m)
 144 {
 145         int ret;
 146         struct ad799x_state *st = iio_priv(dev_info);
 147         unsigned int scale_uv;
 148
 149         switch (m) {
 150         case 0:
 151                 mutex_lock(&dev_info->mlock);
 152                 if (iio_ring_enabled(dev_info))
 153                         ret = ad799x_single_channel_from_ring(st,
 154                                                               chan->address);
 155                 else
 156                         ret = ad799x_scan_direct(st, chan->address);
 157                 mutex_unlock(&dev_info->mlock);
 158
 159                 if (ret < 0)
 160                         return ret;
 161                 *val = (ret >> st->chip_info->channel[0].scan_type.shift) &
 162                         RES_MASK(st->chip_info->channel[0].scan_type.realbits);
 163                 return IIO_VAL_INT;
 164         case (1 << IIO_CHAN_INFO_SCALE_SHARED):
 165                 scale_uv = (st->int_vref_mv * 1000)
 166                         >> st->chip_info->channel[0].scan_type.realbits;
 167                 *val =  scale_uv / 1000;
 168                 *val2 = (scale_uv % 1000) * 1000;
 169                 return IIO_VAL_INT_PLUS_MICRO;
 170         }
 171         return -EINVAL;
 172 }
 173
 174 static ssize_t ad799x_read_frequency(struct device *dev,
 175                                         struct device_attribute *attr,
 176                                         char *buf)
 177 {
 178         struct iio_dev *dev_info = dev_get_drvdata(dev);
 179         struct ad799x_state *st = iio_priv(dev_info);
 180
 181         int ret, len = 0;
 182         u8 val;
 183         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
 184         if (ret)
 185                 return ret;
 186
 187         val &= AD7998_CYC_MASK;
 188
 189         switch (val) {
 190         case AD7998_CYC_DIS:
 191                 len = sprintf(buf, "0\n");
 192                 break;
 193         case AD7998_CYC_TCONF_32:
 194                 len = sprintf(buf, "15625\n");
 195                 break;
 196         case AD7998_CYC_TCONF_64:
 197                 len = sprintf(buf, "7812\n");
 198                 break;
 199         case AD7998_CYC_TCONF_128:
 200                 len = sprintf(buf, "3906\n");
 201                 break;
 202         case AD7998_CYC_TCONF_256:
 203                 len = sprintf(buf, "1953\n");
 204                 break;
 205         case AD7998_CYC_TCONF_512:
 206                 len = sprintf(buf, "976\n");
 207                 break;
 208         case AD7998_CYC_TCONF_1024:
 209                 len = sprintf(buf, "488\n");
 210                 break;
 211         case AD7998_CYC_TCONF_2048:
 212                 len = sprintf(buf, "244\n");
 213                 break;
 214         }
 215         return len;
 216 }
 217
 218 static ssize_t ad799x_write_frequency(struct device *dev,
 219                                          struct device_attribute *attr,
 220                                          const char *buf,
 221                                          size_t len)
 222 {
 223         struct iio_dev *dev_info = dev_get_drvdata(dev);
 224         struct ad799x_state *st = iio_priv(dev_info);
 225
 226         long val;
 227         int ret;
 228         u8 t;
 229
 230         ret = strict_strtol(buf, 10, &val);
 231         if (ret)
 232                 return ret;
 233
 234         mutex_lock(&dev_info->mlock);
 235         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
 236         if (ret)
 237                 goto error_ret_mutex;
 238         /* Wipe the bits clean */
 239         t &= ~AD7998_CYC_MASK;
 240
 241         switch (val) {
 242         case 15625:
 243                 t |= AD7998_CYC_TCONF_32;
 244                 break;
 245         case 7812:
 246                 t |= AD7998_CYC_TCONF_64;
 247                 break;
 248         case 3906:
 249                 t |= AD7998_CYC_TCONF_128;
 250                 break;
 251         case 1953:
 252                 t |= AD7998_CYC_TCONF_256;
 253                 break;
 254         case 976:
 255                 t |= AD7998_CYC_TCONF_512;
 256                 break;
 257         case 488:
 258                 t |= AD7998_CYC_TCONF_1024;
 259                 break;
 260         case 244:
 261                 t |= AD7998_CYC_TCONF_2048;
 262                 break;
 263         case  0:
 264                 t |= AD7998_CYC_DIS;
 265                 break;
 266         default:
 267                 ret = -EINVAL;
 268                 goto error_ret_mutex;
 269         }
 270
 271         ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
 272
 273 error_ret_mutex:
 274         mutex_unlock(&dev_info->mlock);
 275
 276         return ret ? ret : len;
 277 }
 278
 279 static ssize_t ad799x_read_channel_config(struct device *dev,
 280                                         struct device_attribute *attr,
 281                                         char *buf)
 282 {
 283         struct iio_dev *dev_info = dev_get_drvdata(dev);
 284         struct ad799x_state *st = iio_priv(dev_info);
 285         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 286
 287         int ret;
 288         u16 val;
 289         ret = ad799x_i2c_read16(st, this_attr->address, &val);
 290         if (ret)
 291                 return ret;
 292
 293         return sprintf(buf, "%d\n", val);
 294 }
 295
 296 static ssize_t ad799x_write_channel_config(struct device *dev,
 297                                          struct device_attribute *attr,
 298                                          const char *buf,
 299                                          size_t len)
 300 {
 301         struct iio_dev *dev_info = dev_get_drvdata(dev);
 302         struct ad799x_state *st = iio_priv(dev_info);
 303         struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 304
 305         long val;
 306         int ret;
 307
 308         ret = strict_strtol(buf, 10, &val);
 309         if (ret)
 310                 return ret;
 311
 312         mutex_lock(&dev_info->mlock);
 313         ret = ad799x_i2c_write16(st, this_attr->address, val);
 314         mutex_unlock(&dev_info->mlock);
 315
 316         return ret ? ret : len;
 317 }
 318
 319 static irqreturn_t ad799x_event_handler(int irq, void *private)
 320 {
 321         struct iio_dev *indio_dev = private;
 322         struct ad799x_state *st = iio_priv(private);
 323         u8 status;
 324         int i, ret;
 325
 326         ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
 327         if (ret)
 328                 return ret;
 329
 330         if (!status)
 331                 return -EIO;
 332
 333         ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
 334
 335         for (i = 0; i < 8; i++) {
 336                 if (status & (1 << i))
 337                         iio_push_event(indio_dev,
 338                                        i & 0x1 ?
 339                                        IIO_UNMOD_EVENT_CODE(IIO_IN,
 340                                                             (i >> 1),
 341                                                             IIO_EV_TYPE_THRESH,
 342                                                             IIO_EV_DIR_RISING) :
 343                                        IIO_UNMOD_EVENT_CODE(IIO_IN,
 344                                                             (i >> 1),
 345                                                             IIO_EV_TYPE_THRESH,
 346                                                             IIO_EV_DIR_FALLING),
 347                                        iio_get_time_ns());
 348         }
 349
 350         return IRQ_HANDLED;
 351 }
 352
 353 static IIO_DEVICE_ATTR(in0_thresh_low_value,
 354                        S_IRUGO | S_IWUSR,
 355                        ad799x_read_channel_config,
 356                        ad799x_write_channel_config,
 357                        AD7998_DATALOW_CH1_REG);
 358
 359 static IIO_DEVICE_ATTR(in0_thresh_high_value,
 360                        S_IRUGO | S_IWUSR,
 361                        ad799x_read_channel_config,
 362                        ad799x_write_channel_config,
 363                        AD7998_DATAHIGH_CH1_REG);
 364
 365 static IIO_DEVICE_ATTR(in0_thresh_both_hyst_raw,
 366                        S_IRUGO | S_IWUSR,
 367                        ad799x_read_channel_config,
 368                        ad799x_write_channel_config,
 369                        AD7998_HYST_CH1_REG);
 370
 371 static IIO_DEVICE_ATTR(in1_thresh_low_value,
 372                        S_IRUGO | S_IWUSR,
 373                        ad799x_read_channel_config,
 374                        ad799x_write_channel_config,
 375                        AD7998_DATALOW_CH2_REG);
 376
 377 static IIO_DEVICE_ATTR(in1_thresh_high_value,
 378                        S_IRUGO | S_IWUSR,
 379                        ad799x_read_channel_config,
 380                        ad799x_write_channel_config,
 381                        AD7998_DATAHIGH_CH2_REG);
 382
 383 static IIO_DEVICE_ATTR(in1_thresh_both_hyst_raw,
 384                        S_IRUGO | S_IWUSR,
 385                        ad799x_read_channel_config,
 386                        ad799x_write_channel_config,
 387                        AD7998_HYST_CH2_REG);
 388
 389 static IIO_DEVICE_ATTR(in2_thresh_low_value,
 390                        S_IRUGO | S_IWUSR,
 391                        ad799x_read_channel_config,
 392                        ad799x_write_channel_config,
 393                        AD7998_DATALOW_CH3_REG);
 394
 395 static IIO_DEVICE_ATTR(in2_thresh_high_value,
 396                        S_IRUGO | S_IWUSR,
 397                        ad799x_read_channel_config,
 398                        ad799x_write_channel_config,
 399                        AD7998_DATAHIGH_CH3_REG);
 400
 401 static IIO_DEVICE_ATTR(in2_thresh_both_hyst_raw,
 402                        S_IRUGO | S_IWUSR,
 403                        ad799x_read_channel_config,
 404                        ad799x_write_channel_config,
 405                        AD7998_HYST_CH3_REG);
 406
 407 static IIO_DEVICE_ATTR(in3_thresh_low_value,
 408                        S_IRUGO | S_IWUSR,
 409                        ad799x_read_channel_config,
 410                        ad799x_write_channel_config,
 411                        AD7998_DATALOW_CH4_REG);
 412
 413 static IIO_DEVICE_ATTR(in3_thresh_high_value,
 414                        S_IRUGO | S_IWUSR,
 415                        ad799x_read_channel_config,
 416                        ad799x_write_channel_config,
 417                        AD7998_DATAHIGH_CH4_REG);
 418
 419 static IIO_DEVICE_ATTR(in3_thresh_both_hyst_raw,
 420                        S_IRUGO | S_IWUSR,
 421                        ad799x_read_channel_config,
 422                        ad799x_write_channel_config,
 423                        AD7998_HYST_CH4_REG);
 424
 425 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 426                               ad799x_read_frequency,
 427                               ad799x_write_frequency);
 428 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 429
 430 static struct attribute *ad7993_4_7_8_event_attributes[] = {
 431         &iio_dev_attr_in0_thresh_low_value.dev_attr.attr,
 432         &iio_dev_attr_in0_thresh_high_value.dev_attr.attr,
 433         &iio_dev_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
 434         &iio_dev_attr_in1_thresh_low_value.dev_attr.attr,
 435         &iio_dev_attr_in1_thresh_high_value.dev_attr.attr,
 436         &iio_dev_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
 437         &iio_dev_attr_in2_thresh_low_value.dev_attr.attr,
 438         &iio_dev_attr_in2_thresh_high_value.dev_attr.attr,
 439         &iio_dev_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
 440         &iio_dev_attr_in3_thresh_low_value.dev_attr.attr,
 441         &iio_dev_attr_in3_thresh_high_value.dev_attr.attr,
 442         &iio_dev_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
 443         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 444         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 445         NULL,
 446 };
 447
 448 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
 449         .attrs = ad7993_4_7_8_event_attributes,
 450         .name = "events",
 451 };
 452
 453 static struct attribute *ad7992_event_attributes[] = {
 454         &iio_dev_attr_in0_thresh_low_value.dev_attr.attr,
 455         &iio_dev_attr_in0_thresh_high_value.dev_attr.attr,
 456         &iio_dev_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
 457         &iio_dev_attr_in1_thresh_low_value.dev_attr.attr,
 458         &iio_dev_attr_in1_thresh_high_value.dev_attr.attr,
 459         &iio_dev_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
 460         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 461         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 462         NULL,
 463 };
 464
 465 static struct attribute_group ad7992_event_attrs_group = {
 466         .attrs = ad7992_event_attributes,
 467         .name = "events",
 468 };
 469
 470 static const struct iio_info ad7991_info = {
 471         .read_raw = &ad799x_read_raw,
 472         .driver_module = THIS_MODULE,
 473 };
 474
 475 static const struct iio_info ad7992_info = {
 476         .read_raw = &ad799x_read_raw,
 477         .event_attrs = &ad7992_event_attrs_group,
 478         .driver_module = THIS_MODULE,
 479 };
 480
 481 static const struct iio_info ad7993_4_7_8_info = {
 482         .read_raw = &ad799x_read_raw,
 483         .event_attrs = &ad7993_4_7_8_event_attrs_group,
 484         .driver_module = THIS_MODULE,
 485 };
 486
 487 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 488         [ad7991] = {
 489                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 490                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 491                                        0, 0, IIO_ST('u', 12, 16, 0), 0),
 492                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 493                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 494                                        1, 1, IIO_ST('u', 12, 16, 0), 0),
 495                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 496                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 497                                        2, 2, IIO_ST('u', 12, 16, 0), 0),
 498                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 499                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 500                                        3, 3, IIO_ST('u', 12, 16, 0), 0),
 501                 .channel[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 502                 .num_channels = 5,
 503                 .int_vref_mv = 4096,
 504                 .info = &ad7991_info,
 505         },
 506         [ad7995] = {
 507                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 508                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 509                                        0, 0, IIO_ST('u', 10, 16, 0), 0),
 510                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 511                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 512                                        1, 1, IIO_ST('u', 10, 16, 0), 0),
 513                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 514                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 515                                        2, 2, IIO_ST('u', 10, 16, 0), 0),
 516                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 517                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 518                                        3, 3, IIO_ST('u', 10, 16, 0), 0),
 519                 .channel[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 520                 .num_channels = 5,
 521                 .int_vref_mv = 1024,
 522                 .info = &ad7991_info,
 523         },
 524         [ad7999] = {
 525                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 526                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 527                                        0, 0, IIO_ST('u', 10, 16, 0), 0),
 528                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 529                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 530                                        1, 1, IIO_ST('u', 10, 16, 0), 0),
 531                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 532                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 533                                        2, 2, IIO_ST('u', 10, 16, 0), 0),
 534                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 535                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 536                                        3, 3, IIO_ST('u', 10, 16, 0), 0),
 537                 .channel[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 538                 .num_channels = 5,
 539                 .int_vref_mv = 1024,
 540                 .info = &ad7991_info,
 541         },
 542         [ad7992] = {
 543                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 544                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 545                                        0, 0, IIO_ST('u', 12, 16, 0), 0),
 546                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 547                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 548                                        1, 1, IIO_ST('u', 12, 16, 0), 0),
 549                 .channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
 550                 .num_channels = 3,
 551                 .int_vref_mv = 4096,
 552                 .default_config = AD7998_ALERT_EN,
 553                 .info = &ad7992_info,
 554         },
 555         [ad7993] = {
 556                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 557                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 558                                        0, 0, IIO_ST('u', 10, 16, 0), 0),
 559                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 560                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 561                                        1, 1, IIO_ST('u', 10, 16, 0), 0),
 562                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 563                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 564                                        2, 2, IIO_ST('u', 10, 16, 0), 0),
 565                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 566                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 567                                        3, 3, IIO_ST('u', 10, 16, 0), 0),
 568                 .channel[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 569                 .num_channels = 5,
 570                 .int_vref_mv = 1024,
 571                 .default_config = AD7998_ALERT_EN,
 572                 .info = &ad7993_4_7_8_info,
 573         },
 574         [ad7994] = {
 575                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 576                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 577                                        0, 0, IIO_ST('u', 12, 16, 0), 0),
 578                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 579                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 580                                        1, 1, IIO_ST('u', 12, 16, 0), 0),
 581                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 582                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 583                                        2, 2, IIO_ST('u', 12, 16, 0), 0),
 584                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 585                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 586                                        3, 3, IIO_ST('u', 12, 16, 0), 0),
 587                 .channel[4] = IIO_CHAN_SOFT_TIMESTAMP(4),
 588                 .num_channels = 5,
 589                 .int_vref_mv = 4096,
 590                 .default_config = AD7998_ALERT_EN,
 591                 .info = &ad7993_4_7_8_info,
 592         },
 593         [ad7997] = {
 594                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 595                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 596                                           0, 0, IIO_ST('u', 10, 16, 0), 0),
 597                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 598                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 599                                           1, 1, IIO_ST('u', 10, 16, 0), 0),
 600                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 601                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 602                                           2, 2, IIO_ST('u', 10, 16, 0), 0),
 603                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 604                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 605                                           3, 3, IIO_ST('u', 10, 16, 0), 0),
 606                 .channel[4] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0,
 607                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 608                                           4, 4, IIO_ST('u', 10, 16, 0), 0),
 609                 .channel[5] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0,
 610                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 611                                           5, 5, IIO_ST('u', 10, 16, 0), 0),
 612                 .channel[6] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 6, 0,
 613                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 614                                           6, 6, IIO_ST('u', 10, 16, 0), 0),
 615                 .channel[7] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 7, 0,
 616                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 617                                           7, 7, IIO_ST('u', 10, 16, 0), 0),
 618                 .channel[8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 619                 .num_channels = 9,
 620                 .int_vref_mv = 1024,
 621                 .default_config = AD7998_ALERT_EN,
 622                 .info = &ad7993_4_7_8_info,
 623         },
 624         [ad7998] = {
 625                 .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0,
 626                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 627                                        0, 0, IIO_ST('u', 12, 16, 0), 0),
 628                 .channel[1] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 1, 0,
 629                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 630                                        1, 1, IIO_ST('u', 12, 16, 0), 0),
 631                 .channel[2] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 2, 0,
 632                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 633                                        2, 2, IIO_ST('u', 12, 16, 0), 0),
 634                 .channel[3] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 3, 0,
 635                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 636                                        3, 3, IIO_ST('u', 12, 16, 0), 0),
 637                 .channel[4] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 4, 0,
 638                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 639                                        4, 4, IIO_ST('u', 12, 16, 0), 0),
 640                 .channel[5] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 5, 0,
 641                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 642                                        5, 5, IIO_ST('u', 12, 16, 0), 0),
 643                 .channel[6] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 6, 0,
 644                                        (1 << IIO_CHAN_INFO_SCALE_SHARED),
 645                                        6, 6, IIO_ST('u', 12, 16, 0), 0),
 646                 .channel[7] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 7, 0,
 647                                           (1 << IIO_CHAN_INFO_SCALE_SHARED),
 648                                           7, 7, IIO_ST('u', 12, 16, 0), 0),
 649                 .channel[8] = IIO_CHAN_SOFT_TIMESTAMP(8),
 650                 .num_channels = 9,
 651                 .int_vref_mv = 4096,
 652                 .default_config = AD7998_ALERT_EN,
 653                 .info = &ad7993_4_7_8_info,
 654         },
 655 };
 656
 657 static int __devinit ad799x_probe(struct i2c_client *client,
 658                                    const struct i2c_device_id *id)
 659 {
 660         int ret, regdone = 0;
 661         struct ad799x_platform_data *pdata = client->dev.platform_data;
 662         struct ad799x_state *st;
 663         struct iio_dev *indio_dev = iio_allocate_device(sizeof(*st));
 664
 665         if (indio_dev == NULL)
 666                 return -ENOMEM;
 667
 668         st = iio_priv(indio_dev);
 669         /* this is only used for device removal purposes */
 670         i2c_set_clientdata(client, indio_dev);
 671
 672         st->id = id->driver_data;
 673         st->chip_info = &ad799x_chip_info_tbl[st->id];
 674         st->config = st->chip_info->default_config;
 675
 676         /* TODO: Add pdata options for filtering and bit delay */
 677
 678         if (pdata)
 679                 st->int_vref_mv = pdata->vref_mv;
 680         else
 681                 st->int_vref_mv = st->chip_info->int_vref_mv;
 682
 683         st->reg = regulator_get(&client->dev, "vcc");
 684         if (!IS_ERR(st->reg)) {
 685                 ret = regulator_enable(st->reg);
 686                 if (ret)
 687                         goto error_put_reg;
 688         }
 689         st->client = client;
 690
 691         indio_dev->dev.parent = &client->dev;
 692         indio_dev->name = id->name;
 693         indio_dev->info = st->chip_info->info;
 694         indio_dev->name = id->name;
 695
 696         indio_dev->modes = INDIO_DIRECT_MODE;
 697         indio_dev->channels = st->chip_info->channel;
 698         indio_dev->num_channels = st->chip_info->num_channels;
 699
 700         ret = ad799x_register_ring_funcs_and_init(indio_dev);
 701         if (ret)
 702                 goto error_disable_reg;
 703
 704         ret = iio_device_register(indio_dev);
 705         if (ret)
 706                 goto error_cleanup_ring;
 707         regdone = 1;
 708
 709         ret = iio_ring_buffer_register(indio_dev,
 710                                        indio_dev->channels,
 711                                        indio_dev->num_channels);
 712         if (ret)
 713                 goto error_cleanup_ring;
 714
 715         if (client->irq > 0) {
 716                 ret = request_threaded_irq(client->irq,
 717                                            NULL,
 718                                            ad799x_event_handler,
 719                                            IRQF_TRIGGER_FALLING |
 720                                            IRQF_ONESHOT,
 721                                            client->name,
 722                                            indio_dev);
 723                 if (ret)
 724                         goto error_cleanup_ring;
 725         }
 726
 727         return 0;
 728
 729 error_cleanup_ring:
 730         ad799x_ring_cleanup(indio_dev);
 731 error_disable_reg:
 732         if (!IS_ERR(st->reg))
 733                 regulator_disable(st->reg);
 734 error_put_reg:
 735         if (!IS_ERR(st->reg))
 736                 regulator_put(st->reg);
 737         if (regdone)
 738                 iio_device_unregister(indio_dev);
 739         else
 740                 iio_free_device(indio_dev);
 741
 742         return ret;
 743 }
 744
 745 static __devexit int ad799x_remove(struct i2c_client *client)
 746 {
 747         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 748         struct ad799x_state *st = iio_priv(indio_dev);
 749
 750         if (client->irq > 0)
 751                 free_irq(client->irq, indio_dev);
 752
 753         iio_ring_buffer_unregister(indio_dev);
 754         ad799x_ring_cleanup(indio_dev);
 755         if (!IS_ERR(st->reg)) {
 756                 regulator_disable(st->reg);
 757                 regulator_put(st->reg);
 758         }
 759         iio_device_unregister(indio_dev);
 760
 761         return 0;
 762 }
 763
 764 static const struct i2c_device_id ad799x_id[] = {
 765         { "ad7991", ad7991 },
 766         { "ad7995", ad7995 },
 767         { "ad7999", ad7999 },
 768         { "ad7992", ad7992 },
 769         { "ad7993", ad7993 },
 770         { "ad7994", ad7994 },
 771         { "ad7997", ad7997 },
 772         { "ad7998", ad7998 },
 773         {}
 774 };
 775
 776 MODULE_DEVICE_TABLE(i2c, ad799x_id);
 777
 778 static struct i2c_driver ad799x_driver = {
 779         .driver = {
 780                 .name = "ad799x",
 781         },
 782         .probe = ad799x_probe,
 783         .remove = __devexit_p(ad799x_remove),
 784         .id_table = ad799x_id,
 785 };
 786
 787 static __init int ad799x_init(void)
 788 {
 789         return i2c_add_driver(&ad799x_driver);
 790 }
 791
 792 static __exit void ad799x_exit(void)
 793 {
 794         i2c_del_driver(&ad799x_driver);
 795 }
 796
 797 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 798 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 799 MODULE_LICENSE("GPL v2");
 800 MODULE_ALIAS("i2c:ad799x");
 801
 802 module_init(ad799x_init);
 803 module_exit(ad799x_exit);