drivers/iio/adc/ad799x.c

   1 /*
   2  * iio/adc/ad799x.c
   3  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
   4  *
   5  * based on iio/adc/max1363
   6  * Copyright (C) 2008-2010 Jonathan Cameron
   7  *
   8  * based on linux/drivers/i2c/chips/max123x
   9  * Copyright (C) 2002-2004 Stefan Eletzhofer
  10  *
  11  * based on linux/drivers/acron/char/pcf8583.c
  12  * Copyright (C) 2000 Russell King
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  *
  18  * ad799x.c
  19  *
  20  * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
  21  * ad7998 and similar chips.
  22  *
  23  */
  24
  25 #include <linux/interrupt.h>
  26 #include <linux/device.h>
  27 #include <linux/kernel.h>
  28 #include <linux/sysfs.h>
  29 #include <linux/i2c.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/slab.h>
  32 #include <linux/types.h>
  33 #include <linux/err.h>
  34 #include <linux/module.h>
  35
  36 #include <linux/iio/iio.h>
  37 #include <linux/iio/sysfs.h>
  38 #include <linux/iio/events.h>
  39 #include <linux/iio/buffer.h>
  40 #include <linux/iio/trigger_consumer.h>
  41 #include <linux/iio/triggered_buffer.h>
  42
  43 #define AD799X_CHANNEL_SHIFT                    4
  44 #define AD799X_STORAGEBITS                      16
  45 /*
  46  * AD7991, AD7995 and AD7999 defines
  47  */
  48
  49 #define AD7991_REF_SEL                          0x08
  50 #define AD7991_FLTR                             0x04
  51 #define AD7991_BIT_TRIAL_DELAY                  0x02
  52 #define AD7991_SAMPLE_DELAY                     0x01
  53
  54 /*
  55  * AD7992, AD7993, AD7994, AD7997 and AD7998 defines
  56  */
  57
  58 #define AD7998_FLTR                             0x08
  59 #define AD7998_ALERT_EN                         0x04
  60 #define AD7998_BUSY_ALERT                       0x02
  61 #define AD7998_BUSY_ALERT_POL                   0x01
  62
  63 #define AD7998_CONV_RES_REG                     0x0
  64 #define AD7998_ALERT_STAT_REG                   0x1
  65 #define AD7998_CONF_REG                         0x2
  66 #define AD7998_CYCLE_TMR_REG                    0x3
  67
  68 #define AD7998_DATALOW_REG(x)                   ((x) * 3 + 0x4)
  69 #define AD7998_DATAHIGH_REG(x)                  ((x) * 3 + 0x5)
  70 #define AD7998_HYST_REG(x)                      ((x) * 3 + 0x6)
  71
  72 #define AD7998_CYC_MASK                         0x7
  73 #define AD7998_CYC_DIS                          0x0
  74 #define AD7998_CYC_TCONF_32                     0x1
  75 #define AD7998_CYC_TCONF_64                     0x2
  76 #define AD7998_CYC_TCONF_128                    0x3
  77 #define AD7998_CYC_TCONF_256                    0x4
  78 #define AD7998_CYC_TCONF_512                    0x5
  79 #define AD7998_CYC_TCONF_1024                   0x6
  80 #define AD7998_CYC_TCONF_2048                   0x7
  81
  82 #define AD7998_ALERT_STAT_CLEAR                 0xFF
  83
  84 /*
  85  * AD7997 and AD7997 defines
  86  */
  87
  88 #define AD7997_8_READ_SINGLE                    0x80
  89 #define AD7997_8_READ_SEQUENCE                  0x70
  90 /* TODO: move this into a common header */
  91 #define RES_MASK(bits)  ((1 << (bits)) - 1)
  92
  93 enum {
  94         ad7991,
  95         ad7995,
  96         ad7999,
  97         ad7992,
  98         ad7993,
  99         ad7994,
 100         ad7997,
 101         ad7998
 102 };
 103
 104 /**
 105  * struct ad799x_chip_info - chip specific information
 106  * @channel:            channel specification
 107  * @num_channels:       number of channels
 108  * @default_config:     device default configuration
 109  * @info:               pointer to iio_info struct
 110  */
 111 struct ad799x_chip_info {
 112         struct iio_chan_spec            channel[9];
 113         int                             num_channels;
 114         u16                             default_config;
 115         const struct iio_info           *info;
 116 };
 117
 118 struct ad799x_state {
 119         struct i2c_client               *client;
 120         const struct ad799x_chip_info   *chip_info;
 121         struct regulator                *reg;
 122         struct regulator                *vref;
 123         unsigned                        id;
 124         u16                             config;
 125
 126         u8                              *rx_buf;
 127         unsigned int                    transfer_size;
 128 };
 129
 130 /**
 131  * ad799x_trigger_handler() bh of trigger launched polling to ring buffer
 132  *
 133  * Currently there is no option in this driver to disable the saving of
 134  * timestamps within the ring.
 135  **/
 136 static irqreturn_t ad799x_trigger_handler(int irq, void *p)
 137 {
 138         struct iio_poll_func *pf = p;
 139         struct iio_dev *indio_dev = pf->indio_dev;
 140         struct ad799x_state *st = iio_priv(indio_dev);
 141         int b_sent;
 142         u8 cmd;
 143
 144         switch (st->id) {
 145         case ad7991:
 146         case ad7995:
 147         case ad7999:
 148                 cmd = st->config |
 149                         (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT);
 150                 break;
 151         case ad7992:
 152         case ad7993:
 153         case ad7994:
 154                 cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
 155                         AD7998_CONV_RES_REG;
 156                 break;
 157         case ad7997:
 158         case ad7998:
 159                 cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
 160                 break;
 161         default:
 162                 cmd = 0;
 163         }
 164
 165         b_sent = i2c_smbus_read_i2c_block_data(st->client,
 166                         cmd, st->transfer_size, st->rx_buf);
 167         if (b_sent < 0)
 168                 goto out;
 169
 170         iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
 171                         iio_get_time_ns());
 172 out:
 173         iio_trigger_notify_done(indio_dev->trig);
 174
 175         return IRQ_HANDLED;
 176 }
 177
 178 /*
 179  * ad799x register access by I2C
 180  */
 181 static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
 182 {
 183         struct i2c_client *client = st->client;
 184         int ret = 0;
 185
 186         ret = i2c_smbus_read_word_swapped(client, reg);
 187         if (ret < 0) {
 188                 dev_err(&client->dev, "I2C read error\n");
 189                 return ret;
 190         }
 191
 192         *data = (u16)ret;
 193
 194         return 0;
 195 }
 196
 197 static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
 198 {
 199         struct i2c_client *client = st->client;
 200         int ret = 0;
 201
 202         ret = i2c_smbus_read_byte_data(client, reg);
 203         if (ret < 0) {
 204                 dev_err(&client->dev, "I2C read error\n");
 205                 return ret;
 206         }
 207
 208         *data = (u8)ret;
 209
 210         return 0;
 211 }
 212
 213 static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
 214 {
 215         struct i2c_client *client = st->client;
 216         int ret = 0;
 217
 218         ret = i2c_smbus_write_word_swapped(client, reg, data);
 219         if (ret < 0)
 220                 dev_err(&client->dev, "I2C write error\n");
 221
 222         return ret;
 223 }
 224
 225 static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
 226 {
 227         struct i2c_client *client = st->client;
 228         int ret = 0;
 229
 230         ret = i2c_smbus_write_byte_data(client, reg, data);
 231         if (ret < 0)
 232                 dev_err(&client->dev, "I2C write error\n");
 233
 234         return ret;
 235 }
 236
 237 static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
 238         const unsigned long *scan_mask)
 239 {
 240         struct ad799x_state *st = iio_priv(indio_dev);
 241
 242         kfree(st->rx_buf);
 243         st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 244         if (!st->rx_buf)
 245                 return -ENOMEM;
 246
 247         st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
 248
 249         switch (st->id) {
 250         case ad7997:
 251         case ad7998:
 252                 return ad799x_i2c_write16(st, AD7998_CONF_REG,
 253                         st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
 254         default:
 255                 break;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 262 {
 263         u16 rxbuf;
 264         u8 cmd;
 265         int ret;
 266
 267         switch (st->id) {
 268         case ad7991:
 269         case ad7995:
 270         case ad7999:
 271                 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
 272                 break;
 273         case ad7992:
 274         case ad7993:
 275         case ad7994:
 276                 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
 277                 break;
 278         case ad7997:
 279         case ad7998:
 280                 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
 281                 break;
 282         default:
 283                 return -EINVAL;
 284         }
 285
 286         ret = ad799x_i2c_read16(st, cmd, &rxbuf);
 287         if (ret < 0)
 288                 return ret;
 289
 290         return rxbuf;
 291 }
 292
 293 static int ad799x_read_raw(struct iio_dev *indio_dev,
 294                            struct iio_chan_spec const *chan,
 295                            int *val,
 296                            int *val2,
 297                            long m)
 298 {
 299         int ret;
 300         struct ad799x_state *st = iio_priv(indio_dev);
 301
 302         switch (m) {
 303         case IIO_CHAN_INFO_RAW:
 304                 mutex_lock(&indio_dev->mlock);
 305                 if (iio_buffer_enabled(indio_dev))
 306                         ret = -EBUSY;
 307                 else
 308                         ret = ad799x_scan_direct(st, chan->scan_index);
 309                 mutex_unlock(&indio_dev->mlock);
 310
 311                 if (ret < 0)
 312                         return ret;
 313                 *val = (ret >> chan->scan_type.shift) &
 314                         RES_MASK(chan->scan_type.realbits);
 315                 return IIO_VAL_INT;
 316         case IIO_CHAN_INFO_SCALE:
 317                 ret = regulator_get_voltage(st->vref);
 318                 if (ret < 0)
 319                         return ret;
 320                 *val = ret / 1000;
 321                 *val2 = chan->scan_type.realbits;
 322                 return IIO_VAL_FRACTIONAL_LOG2;
 323         }
 324         return -EINVAL;
 325 }
 326 static const unsigned int ad7998_frequencies[] = {
 327         [AD7998_CYC_DIS]        = 0,
 328         [AD7998_CYC_TCONF_32]   = 15625,
 329         [AD7998_CYC_TCONF_64]   = 7812,
 330         [AD7998_CYC_TCONF_128]  = 3906,
 331         [AD7998_CYC_TCONF_512]  = 976,
 332         [AD7998_CYC_TCONF_1024] = 488,
 333         [AD7998_CYC_TCONF_2048] = 244,
 334 };
 335 static ssize_t ad799x_read_frequency(struct device *dev,
 336                                         struct device_attribute *attr,
 337                                         char *buf)
 338 {
 339         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 340         struct ad799x_state *st = iio_priv(indio_dev);
 341
 342         int ret;
 343         u8 val;
 344         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
 345         if (ret)
 346                 return ret;
 347
 348         val &= AD7998_CYC_MASK;
 349
 350         return sprintf(buf, "%u\n", ad7998_frequencies[val]);
 351 }
 352
 353 static ssize_t ad799x_write_frequency(struct device *dev,
 354                                          struct device_attribute *attr,
 355                                          const char *buf,
 356                                          size_t len)
 357 {
 358         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 359         struct ad799x_state *st = iio_priv(indio_dev);
 360
 361         long val;
 362         int ret, i;
 363         u8 t;
 364
 365         ret = kstrtol(buf, 10, &val);
 366         if (ret)
 367                 return ret;
 368
 369         mutex_lock(&indio_dev->mlock);
 370         ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
 371         if (ret)
 372                 goto error_ret_mutex;
 373         /* Wipe the bits clean */
 374         t &= ~AD7998_CYC_MASK;
 375
 376         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
 377                 if (val == ad7998_frequencies[i])
 378                         break;
 379         if (i == ARRAY_SIZE(ad7998_frequencies)) {
 380                 ret = -EINVAL;
 381                 goto error_ret_mutex;
 382         }
 383         t |= i;
 384         ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
 385
 386 error_ret_mutex:
 387         mutex_unlock(&indio_dev->mlock);
 388
 389         return ret ? ret : len;
 390 }
 391
 392 static int ad799x_read_event_config(struct iio_dev *indio_dev,
 393                                     const struct iio_chan_spec *chan,
 394                                     enum iio_event_type type,
 395                                     enum iio_event_direction dir)
 396 {
 397         return 1;
 398 }
 399
 400 static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
 401                                          enum iio_event_direction dir,
 402                                          enum iio_event_info info)
 403 {
 404         switch (info) {
 405         case IIO_EV_INFO_VALUE:
 406                 if (dir == IIO_EV_DIR_FALLING)
 407                         return AD7998_DATALOW_REG(chan->channel);
 408                 else
 409                         return AD7998_DATAHIGH_REG(chan->channel);
 410         case IIO_EV_INFO_HYSTERESIS:
 411                 return AD7998_HYST_REG(chan->channel);
 412         default:
 413                 return -EINVAL;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int ad799x_write_event_value(struct iio_dev *indio_dev,
 420                                     const struct iio_chan_spec *chan,
 421                                     enum iio_event_type type,
 422                                     enum iio_event_direction dir,
 423                                     enum iio_event_info info,
 424                                     int val, int val2)
 425 {
 426         int ret;
 427         struct ad799x_state *st = iio_priv(indio_dev);
 428
 429         mutex_lock(&indio_dev->mlock);
 430         ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
 431                 val);
 432         mutex_unlock(&indio_dev->mlock);
 433
 434         return ret;
 435 }
 436
 437 static int ad799x_read_event_value(struct iio_dev *indio_dev,
 438                                     const struct iio_chan_spec *chan,
 439                                     enum iio_event_type type,
 440                                     enum iio_event_direction dir,
 441                                     enum iio_event_info info,
 442                                     int *val, int *val2)
 443 {
 444         int ret;
 445         struct ad799x_state *st = iio_priv(indio_dev);
 446         u16 valin;
 447
 448         mutex_lock(&indio_dev->mlock);
 449         ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
 450                 &valin);
 451         mutex_unlock(&indio_dev->mlock);
 452         if (ret < 0)
 453                 return ret;
 454         *val = valin;
 455
 456         return IIO_VAL_INT;
 457 }
 458
 459 static irqreturn_t ad799x_event_handler(int irq, void *private)
 460 {
 461         struct iio_dev *indio_dev = private;
 462         struct ad799x_state *st = iio_priv(private);
 463         u8 status;
 464         int i, ret;
 465
 466         ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
 467         if (ret)
 468                 goto done;
 469
 470         if (!status)
 471                 goto done;
 472
 473         ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
 474
 475         for (i = 0; i < 8; i++) {
 476                 if (status & (1 << i))
 477                         iio_push_event(indio_dev,
 478                                        i & 0x1 ?
 479                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 480                                                             (i >> 1),
 481                                                             IIO_EV_TYPE_THRESH,
 482                                                             IIO_EV_DIR_RISING) :
 483                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
 484                                                             (i >> 1),
 485                                                             IIO_EV_TYPE_THRESH,
 486                                                             IIO_EV_DIR_FALLING),
 487                                        iio_get_time_ns());
 488         }
 489
 490 done:
 491         return IRQ_HANDLED;
 492 }
 493
 494 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
 495                               ad799x_read_frequency,
 496                               ad799x_write_frequency);
 497 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
 498
 499 static struct attribute *ad799x_event_attributes[] = {
 500         &iio_dev_attr_sampling_frequency.dev_attr.attr,
 501         &iio_const_attr_sampling_frequency_available.dev_attr.attr,
 502         NULL,
 503 };
 504
 505 static struct attribute_group ad799x_event_attrs_group = {
 506         .attrs = ad799x_event_attributes,
 507         .name = "events",
 508 };
 509
 510 static const struct iio_info ad7991_info = {
 511         .read_raw = &ad799x_read_raw,
 512         .driver_module = THIS_MODULE,
 513 };
 514
 515 static const struct iio_info ad7993_4_7_8_info = {
 516         .read_raw = &ad799x_read_raw,
 517         .event_attrs = &ad799x_event_attrs_group,
 518         .read_event_config = &ad799x_read_event_config,
 519         .read_event_value = &ad799x_read_event_value,
 520         .write_event_value = &ad799x_write_event_value,
 521         .driver_module = THIS_MODULE,
 522         .update_scan_mode = ad7997_8_update_scan_mode,
 523 };
 524
 525 static const struct iio_event_spec ad799x_events[] = {
 526         {
 527                 .type = IIO_EV_TYPE_THRESH,
 528                 .dir = IIO_EV_DIR_RISING,
 529                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 530                         BIT(IIO_EV_INFO_ENABLE),
 531         }, {
 532                 .type = IIO_EV_TYPE_THRESH,
 533                 .dir = IIO_EV_DIR_FALLING,
 534                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 535                         BIT(IIO_EV_INFO_ENABLE),
 536         }, {
 537                 .type = IIO_EV_TYPE_THRESH,
 538                 .dir = IIO_EV_DIR_EITHER,
 539                 .mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
 540         },
 541 };
 542
 543 #define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
 544         .type = IIO_VOLTAGE, \
 545         .indexed = 1, \
 546         .channel = (_index), \
 547         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 548         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
 549         .scan_index = (_index), \
 550         .scan_type = { \
 551                 .sign = 'u', \
 552                 .realbits = (_realbits), \
 553                 .storagebits = 16, \
 554                 .shift = 12 - (_realbits), \
 555                 .endianness = IIO_BE, \
 556         }, \
 557         .event_spec = _ev_spec, \
 558         .num_event_specs = _num_ev_spec, \
 559 }
 560
 561 #define AD799X_CHANNEL(_index, _realbits) \
 562         _AD799X_CHANNEL(_index, _realbits, NULL, 0)
 563
 564 #define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
 565         _AD799X_CHANNEL(_index, _realbits, ad799x_events, \
 566                 ARRAY_SIZE(ad799x_events))
 567
 568 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
 569         [ad7991] = {
 570                 .channel = {
 571                         AD799X_CHANNEL(0, 12),
 572                         AD799X_CHANNEL(1, 12),
 573                         AD799X_CHANNEL(2, 12),
 574                         AD799X_CHANNEL(3, 12),
 575                         IIO_CHAN_SOFT_TIMESTAMP(4),
 576                 },
 577                 .num_channels = 5,
 578                 .info = &ad7991_info,
 579         },
 580         [ad7995] = {
 581                 .channel = {
 582                         AD799X_CHANNEL(0, 10),
 583                         AD799X_CHANNEL(1, 10),
 584                         AD799X_CHANNEL(2, 10),
 585                         AD799X_CHANNEL(3, 10),
 586                         IIO_CHAN_SOFT_TIMESTAMP(4),
 587                 },
 588                 .num_channels = 5,
 589                 .info = &ad7991_info,
 590         },
 591         [ad7999] = {
 592                 .channel = {
 593                         AD799X_CHANNEL(0, 8),
 594                         AD799X_CHANNEL(1, 8),
 595                         AD799X_CHANNEL(2, 8),
 596                         AD799X_CHANNEL(3, 8),
 597                         IIO_CHAN_SOFT_TIMESTAMP(4),
 598                 },
 599                 .num_channels = 5,
 600                 .info = &ad7991_info,
 601         },
 602         [ad7992] = {
 603                 .channel = {
 604                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 605                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 606                         IIO_CHAN_SOFT_TIMESTAMP(3),
 607                 },
 608                 .num_channels = 3,
 609                 .default_config = AD7998_ALERT_EN,
 610                 .info = &ad7993_4_7_8_info,
 611         },
 612         [ad7993] = {
 613                 .channel = {
 614                         AD799X_CHANNEL_WITH_EVENTS(0, 10),
 615                         AD799X_CHANNEL_WITH_EVENTS(1, 10),
 616                         AD799X_CHANNEL_WITH_EVENTS(2, 10),
 617                         AD799X_CHANNEL_WITH_EVENTS(3, 10),
 618                         IIO_CHAN_SOFT_TIMESTAMP(4),
 619                 },
 620                 .num_channels = 5,
 621                 .default_config = AD7998_ALERT_EN,
 622                 .info = &ad7993_4_7_8_info,
 623         },
 624         [ad7994] = {
 625                 .channel = {
 626                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 627                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 628                         AD799X_CHANNEL_WITH_EVENTS(2, 12),
 629                         AD799X_CHANNEL_WITH_EVENTS(3, 12),
 630                         IIO_CHAN_SOFT_TIMESTAMP(4),
 631                 },
 632                 .num_channels = 5,
 633                 .default_config = AD7998_ALERT_EN,
 634                 .info = &ad7993_4_7_8_info,
 635         },
 636         [ad7997] = {
 637                 .channel = {
 638                         AD799X_CHANNEL_WITH_EVENTS(0, 10),
 639                         AD799X_CHANNEL_WITH_EVENTS(1, 10),
 640                         AD799X_CHANNEL_WITH_EVENTS(2, 10),
 641                         AD799X_CHANNEL_WITH_EVENTS(3, 10),
 642                         AD799X_CHANNEL(4, 10),
 643                         AD799X_CHANNEL(5, 10),
 644                         AD799X_CHANNEL(6, 10),
 645                         AD799X_CHANNEL(7, 10),
 646                         IIO_CHAN_SOFT_TIMESTAMP(8),
 647                 },
 648                 .num_channels = 9,
 649                 .default_config = AD7998_ALERT_EN,
 650                 .info = &ad7993_4_7_8_info,
 651         },
 652         [ad7998] = {
 653                 .channel = {
 654                         AD799X_CHANNEL_WITH_EVENTS(0, 12),
 655                         AD799X_CHANNEL_WITH_EVENTS(1, 12),
 656                         AD799X_CHANNEL_WITH_EVENTS(2, 12),
 657                         AD799X_CHANNEL_WITH_EVENTS(3, 12),
 658                         AD799X_CHANNEL(4, 12),
 659                         AD799X_CHANNEL(5, 12),
 660                         AD799X_CHANNEL(6, 12),
 661                         AD799X_CHANNEL(7, 12),
 662                         IIO_CHAN_SOFT_TIMESTAMP(8),
 663                 },
 664                 .num_channels = 9,
 665                 .default_config = AD7998_ALERT_EN,
 666                 .info = &ad7993_4_7_8_info,
 667         },
 668 };
 669
 670 static int ad799x_probe(struct i2c_client *client,
 671                                    const struct i2c_device_id *id)
 672 {
 673         int ret;
 674         struct ad799x_state *st;
 675         struct iio_dev *indio_dev;
 676
 677         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
 678         if (indio_dev == NULL)
 679                 return -ENOMEM;
 680
 681         st = iio_priv(indio_dev);
 682         /* this is only used for device removal purposes */
 683         i2c_set_clientdata(client, indio_dev);
 684
 685         st->id = id->driver_data;
 686         st->chip_info = &ad799x_chip_info_tbl[st->id];
 687         st->config = st->chip_info->default_config;
 688
 689         /* TODO: Add pdata options for filtering and bit delay */
 690
 691         st->reg = devm_regulator_get(&client->dev, "vcc");
 692         if (IS_ERR(st->reg))
 693                 return PTR_ERR(st->reg);
 694         ret = regulator_enable(st->reg);
 695         if (ret)
 696                 return ret;
 697         st->vref = devm_regulator_get(&client->dev, "vref");
 698         if (IS_ERR(st->vref)) {
 699                 ret = PTR_ERR(st->vref);
 700                 goto error_disable_reg;
 701         }
 702         ret = regulator_enable(st->vref);
 703         if (ret)
 704                 goto error_disable_reg;
 705
 706         st->client = client;
 707
 708         indio_dev->dev.parent = &client->dev;
 709         indio_dev->name = id->name;
 710         indio_dev->info = st->chip_info->info;
 711
 712         indio_dev->modes = INDIO_DIRECT_MODE;
 713         indio_dev->channels = st->chip_info->channel;
 714         indio_dev->num_channels = st->chip_info->num_channels;
 715
 716         ret = iio_triggered_buffer_setup(indio_dev, NULL,
 717                 &ad799x_trigger_handler, NULL);
 718         if (ret)
 719                 goto error_disable_vref;
 720
 721         if (client->irq > 0) {
 722                 ret = devm_request_threaded_irq(&client->dev,
 723                                                 client->irq,
 724                                                 NULL,
 725                                                 ad799x_event_handler,
 726                                                 IRQF_TRIGGER_FALLING |
 727                                                 IRQF_ONESHOT,
 728                                                 client->name,
 729                                                 indio_dev);
 730                 if (ret)
 731                         goto error_cleanup_ring;
 732         }
 733         ret = iio_device_register(indio_dev);
 734         if (ret)
 735                 goto error_cleanup_ring;
 736
 737         return 0;
 738
 739 error_cleanup_ring:
 740         iio_triggered_buffer_cleanup(indio_dev);
 741 error_disable_vref:
 742         regulator_disable(st->vref);
 743 error_disable_reg:
 744         regulator_disable(st->reg);
 745
 746         return ret;
 747 }
 748
 749 static int ad799x_remove(struct i2c_client *client)
 750 {
 751         struct iio_dev *indio_dev = i2c_get_clientdata(client);
 752         struct ad799x_state *st = iio_priv(indio_dev);
 753
 754         iio_device_unregister(indio_dev);
 755
 756         iio_triggered_buffer_cleanup(indio_dev);
 757         regulator_disable(st->vref);
 758         regulator_disable(st->reg);
 759         kfree(st->rx_buf);
 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 = ad799x_remove,
 784         .id_table = ad799x_id,
 785 };
 786 module_i2c_driver(ad799x_driver);
 787
 788 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 789 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
 790 MODULE_LICENSE("GPL v2");