kernel/drivers/iio/dac/ad5064.c

   1 /*
   2  * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5629R,
   3  * AD5648, AD5666, AD5668, AD5669R Digital to analog converters driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  *
   7  * Licensed under the GPL-2.
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/err.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/spi/spi.h>
  15 #include <linux/i2c.h>
  16 #include <linux/slab.h>
  17 #include <linux/sysfs.h>
  18 #include <linux/regulator/consumer.h>
  19 #include <asm/unaligned.h>
  20
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/sysfs.h>
  23
  24 #define AD5064_MAX_DAC_CHANNELS                 8
  25 #define AD5064_MAX_VREFS                        4
  26
  27 #define AD5064_ADDR(x)                          ((x) << 20)
  28 #define AD5064_CMD(x)                           ((x) << 24)
  29
  30 #define AD5064_ADDR_ALL_DAC                     0xF
  31
  32 #define AD5064_CMD_WRITE_INPUT_N                0x0
  33 #define AD5064_CMD_UPDATE_DAC_N                 0x1
  34 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL     0x2
  35 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_N       0x3
  36 #define AD5064_CMD_POWERDOWN_DAC                0x4
  37 #define AD5064_CMD_CLEAR                        0x5
  38 #define AD5064_CMD_LDAC_MASK                    0x6
  39 #define AD5064_CMD_RESET                        0x7
  40 #define AD5064_CMD_CONFIG                       0x8
  41
  42 #define AD5064_CONFIG_DAISY_CHAIN_ENABLE        BIT(1)
  43 #define AD5064_CONFIG_INT_VREF_ENABLE           BIT(0)
  44
  45 #define AD5064_LDAC_PWRDN_NONE                  0x0
  46 #define AD5064_LDAC_PWRDN_1K                    0x1
  47 #define AD5064_LDAC_PWRDN_100K                  0x2
  48 #define AD5064_LDAC_PWRDN_3STATE                0x3
  49
  50 /**
  51  * struct ad5064_chip_info - chip specific information
  52  * @shared_vref:        whether the vref supply is shared between channels
  53  * @internal_vref:      internal reference voltage. 0 if the chip has no internal
  54  *                      vref.
  55  * @channel:            channel specification
  56  * @num_channels:       number of channels
  57  */
  58
  59 struct ad5064_chip_info {
  60         bool shared_vref;
  61         unsigned long internal_vref;
  62         const struct iio_chan_spec *channels;
  63         unsigned int num_channels;
  64 };
  65
  66 struct ad5064_state;
  67
  68 typedef int (*ad5064_write_func)(struct ad5064_state *st, unsigned int cmd,
  69                 unsigned int addr, unsigned int val);
  70
  71 /**
  72  * struct ad5064_state - driver instance specific data
  73  * @dev:                the device for this driver instance
  74  * @chip_info:          chip model specific constants, available modes etc
  75  * @vref_reg:           vref supply regulators
  76  * @pwr_down:           whether channel is powered down
  77  * @pwr_down_mode:      channel's current power down mode
  78  * @dac_cache:          current DAC raw value (chip does not support readback)
  79  * @use_internal_vref:  set to true if the internal reference voltage should be
  80  *                      used.
  81  * @write:              register write callback
  82  * @data:               i2c/spi transfer buffers
  83  */
  84
  85 struct ad5064_state {
  86         struct device                   *dev;
  87         const struct ad5064_chip_info   *chip_info;
  88         struct regulator_bulk_data      vref_reg[AD5064_MAX_VREFS];
  89         bool                            pwr_down[AD5064_MAX_DAC_CHANNELS];
  90         u8                              pwr_down_mode[AD5064_MAX_DAC_CHANNELS];
  91         unsigned int                    dac_cache[AD5064_MAX_DAC_CHANNELS];
  92         bool                            use_internal_vref;
  93
  94         ad5064_write_func               write;
  95
  96         /*
  97          * DMA (thus cache coherency maintenance) requires the
  98          * transfer buffers to live in their own cache lines.
  99          */
 100         union {
 101                 u8 i2c[3];
 102                 __be32 spi;
 103         } data ____cacheline_aligned;
 104 };
 105
 106 enum ad5064_type {
 107         ID_AD5024,
 108         ID_AD5025,
 109         ID_AD5044,
 110         ID_AD5045,
 111         ID_AD5064,
 112         ID_AD5064_1,
 113         ID_AD5065,
 114         ID_AD5628_1,
 115         ID_AD5628_2,
 116         ID_AD5629_1,
 117         ID_AD5629_2,
 118         ID_AD5648_1,
 119         ID_AD5648_2,
 120         ID_AD5666_1,
 121         ID_AD5666_2,
 122         ID_AD5668_1,
 123         ID_AD5668_2,
 124         ID_AD5669_1,
 125         ID_AD5669_2,
 126 };
 127
 128 static int ad5064_write(struct ad5064_state *st, unsigned int cmd,
 129         unsigned int addr, unsigned int val, unsigned int shift)
 130 {
 131         val <<= shift;
 132
 133         return st->write(st, cmd, addr, val);
 134 }
 135
 136 static int ad5064_sync_powerdown_mode(struct ad5064_state *st,
 137         const struct iio_chan_spec *chan)
 138 {
 139         unsigned int val;
 140         int ret;
 141
 142         val = (0x1 << chan->address);
 143
 144         if (st->pwr_down[chan->channel])
 145                 val |= st->pwr_down_mode[chan->channel] << 8;
 146
 147         ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0);
 148
 149         return ret;
 150 }
 151
 152 static const char * const ad5064_powerdown_modes[] = {
 153         "1kohm_to_gnd",
 154         "100kohm_to_gnd",
 155         "three_state",
 156 };
 157
 158 static int ad5064_get_powerdown_mode(struct iio_dev *indio_dev,
 159         const struct iio_chan_spec *chan)
 160 {
 161         struct ad5064_state *st = iio_priv(indio_dev);
 162
 163         return st->pwr_down_mode[chan->channel] - 1;
 164 }
 165
 166 static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev,
 167         const struct iio_chan_spec *chan, unsigned int mode)
 168 {
 169         struct ad5064_state *st = iio_priv(indio_dev);
 170         int ret;
 171
 172         mutex_lock(&indio_dev->mlock);
 173         st->pwr_down_mode[chan->channel] = mode + 1;
 174
 175         ret = ad5064_sync_powerdown_mode(st, chan);
 176         mutex_unlock(&indio_dev->mlock);
 177
 178         return ret;
 179 }
 180
 181 static const struct iio_enum ad5064_powerdown_mode_enum = {
 182         .items = ad5064_powerdown_modes,
 183         .num_items = ARRAY_SIZE(ad5064_powerdown_modes),
 184         .get = ad5064_get_powerdown_mode,
 185         .set = ad5064_set_powerdown_mode,
 186 };
 187
 188 static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
 189         uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 190 {
 191         struct ad5064_state *st = iio_priv(indio_dev);
 192
 193         return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
 194 }
 195
 196 static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
 197          uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
 198          size_t len)
 199 {
 200         struct ad5064_state *st = iio_priv(indio_dev);
 201         bool pwr_down;
 202         int ret;
 203
 204         ret = strtobool(buf, &pwr_down);
 205         if (ret)
 206                 return ret;
 207
 208         mutex_lock(&indio_dev->mlock);
 209         st->pwr_down[chan->channel] = pwr_down;
 210
 211         ret = ad5064_sync_powerdown_mode(st, chan);
 212         mutex_unlock(&indio_dev->mlock);
 213         return ret ? ret : len;
 214 }
 215
 216 static int ad5064_get_vref(struct ad5064_state *st,
 217         struct iio_chan_spec const *chan)
 218 {
 219         unsigned int i;
 220
 221         if (st->use_internal_vref)
 222                 return st->chip_info->internal_vref;
 223
 224         i = st->chip_info->shared_vref ? 0 : chan->channel;
 225         return regulator_get_voltage(st->vref_reg[i].consumer);
 226 }
 227
 228 static int ad5064_read_raw(struct iio_dev *indio_dev,
 229                            struct iio_chan_spec const *chan,
 230                            int *val,
 231                            int *val2,
 232                            long m)
 233 {
 234         struct ad5064_state *st = iio_priv(indio_dev);
 235         int scale_uv;
 236
 237         switch (m) {
 238         case IIO_CHAN_INFO_RAW:
 239                 *val = st->dac_cache[chan->channel];
 240                 return IIO_VAL_INT;
 241         case IIO_CHAN_INFO_SCALE:
 242                 scale_uv = ad5064_get_vref(st, chan);
 243                 if (scale_uv < 0)
 244                         return scale_uv;
 245
 246                 *val = scale_uv / 1000;
 247                 *val2 = chan->scan_type.realbits;
 248                 return IIO_VAL_FRACTIONAL_LOG2;
 249         default:
 250                 break;
 251         }
 252         return -EINVAL;
 253 }
 254
 255 static int ad5064_write_raw(struct iio_dev *indio_dev,
 256         struct iio_chan_spec const *chan, int val, int val2, long mask)
 257 {
 258         struct ad5064_state *st = iio_priv(indio_dev);
 259         int ret;
 260
 261         switch (mask) {
 262         case IIO_CHAN_INFO_RAW:
 263                 if (val >= (1 << chan->scan_type.realbits) || val < 0)
 264                         return -EINVAL;
 265
 266                 mutex_lock(&indio_dev->mlock);
 267                 ret = ad5064_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,
 268                                 chan->address, val, chan->scan_type.shift);
 269                 if (ret == 0)
 270                         st->dac_cache[chan->channel] = val;
 271                 mutex_unlock(&indio_dev->mlock);
 272                 break;
 273         default:
 274                 ret = -EINVAL;
 275         }
 276
 277         return ret;
 278 }
 279
 280 static const struct iio_info ad5064_info = {
 281         .read_raw = ad5064_read_raw,
 282         .write_raw = ad5064_write_raw,
 283         .driver_module = THIS_MODULE,
 284 };
 285
 286 static const struct iio_chan_spec_ext_info ad5064_ext_info[] = {
 287         {
 288                 .name = "powerdown",
 289                 .read = ad5064_read_dac_powerdown,
 290                 .write = ad5064_write_dac_powerdown,
 291                 .shared = IIO_SEPARATE,
 292         },
 293         IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5064_powerdown_mode_enum),
 294         IIO_ENUM_AVAILABLE("powerdown_mode", &ad5064_powerdown_mode_enum),
 295         { },
 296 };
 297
 298 #define AD5064_CHANNEL(chan, addr, bits, _shift) {              \
 299         .type = IIO_VOLTAGE,                                    \
 300         .indexed = 1,                                           \
 301         .output = 1,                                            \
 302         .channel = (chan),                                      \
 303         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 304         BIT(IIO_CHAN_INFO_SCALE),                                       \
 305         .address = addr,                                        \
 306         .scan_type = {                                          \
 307                 .sign = 'u',                                    \
 308                 .realbits = (bits),                             \
 309                 .storagebits = 16,                              \
 310                 .shift = (_shift),                              \
 311         },                                                      \
 312         .ext_info = ad5064_ext_info,                            \
 313 }
 314
 315 #define DECLARE_AD5064_CHANNELS(name, bits, shift) \
 316 const struct iio_chan_spec name[] = { \
 317         AD5064_CHANNEL(0, 0, bits, shift), \
 318         AD5064_CHANNEL(1, 1, bits, shift), \
 319         AD5064_CHANNEL(2, 2, bits, shift), \
 320         AD5064_CHANNEL(3, 3, bits, shift), \
 321         AD5064_CHANNEL(4, 4, bits, shift), \
 322         AD5064_CHANNEL(5, 5, bits, shift), \
 323         AD5064_CHANNEL(6, 6, bits, shift), \
 324         AD5064_CHANNEL(7, 7, bits, shift), \
 325 }
 326
 327 #define DECLARE_AD5065_CHANNELS(name, bits, shift) \
 328 const struct iio_chan_spec name[] = { \
 329         AD5064_CHANNEL(0, 0, bits, shift), \
 330         AD5064_CHANNEL(1, 3, bits, shift), \
 331 }
 332
 333 static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8);
 334 static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6);
 335 static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4);
 336
 337 static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8);
 338 static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6);
 339 static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4);
 340
 341 static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4);
 342 static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0);
 343
 344 static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
 345         [ID_AD5024] = {
 346                 .shared_vref = false,
 347                 .channels = ad5024_channels,
 348                 .num_channels = 4,
 349         },
 350         [ID_AD5025] = {
 351                 .shared_vref = false,
 352                 .channels = ad5025_channels,
 353                 .num_channels = 2,
 354         },
 355         [ID_AD5044] = {
 356                 .shared_vref = false,
 357                 .channels = ad5044_channels,
 358                 .num_channels = 4,
 359         },
 360         [ID_AD5045] = {
 361                 .shared_vref = false,
 362                 .channels = ad5045_channels,
 363                 .num_channels = 2,
 364         },
 365         [ID_AD5064] = {
 366                 .shared_vref = false,
 367                 .channels = ad5064_channels,
 368                 .num_channels = 4,
 369         },
 370         [ID_AD5064_1] = {
 371                 .shared_vref = true,
 372                 .channels = ad5064_channels,
 373                 .num_channels = 4,
 374         },
 375         [ID_AD5065] = {
 376                 .shared_vref = false,
 377                 .channels = ad5065_channels,
 378                 .num_channels = 2,
 379         },
 380         [ID_AD5628_1] = {
 381                 .shared_vref = true,
 382                 .internal_vref = 2500000,
 383                 .channels = ad5024_channels,
 384                 .num_channels = 8,
 385         },
 386         [ID_AD5628_2] = {
 387                 .shared_vref = true,
 388                 .internal_vref = 5000000,
 389                 .channels = ad5024_channels,
 390                 .num_channels = 8,
 391         },
 392         [ID_AD5629_1] = {
 393                 .shared_vref = true,
 394                 .internal_vref = 2500000,
 395                 .channels = ad5629_channels,
 396                 .num_channels = 8,
 397         },
 398         [ID_AD5629_2] = {
 399                 .shared_vref = true,
 400                 .internal_vref = 5000000,
 401                 .channels = ad5629_channels,
 402                 .num_channels = 8,
 403         },
 404         [ID_AD5648_1] = {
 405                 .shared_vref = true,
 406                 .internal_vref = 2500000,
 407                 .channels = ad5044_channels,
 408                 .num_channels = 8,
 409         },
 410         [ID_AD5648_2] = {
 411                 .shared_vref = true,
 412                 .internal_vref = 5000000,
 413                 .channels = ad5044_channels,
 414                 .num_channels = 8,
 415         },
 416         [ID_AD5666_1] = {
 417                 .shared_vref = true,
 418                 .internal_vref = 2500000,
 419                 .channels = ad5064_channels,
 420                 .num_channels = 4,
 421         },
 422         [ID_AD5666_2] = {
 423                 .shared_vref = true,
 424                 .internal_vref = 5000000,
 425                 .channels = ad5064_channels,
 426                 .num_channels = 4,
 427         },
 428         [ID_AD5668_1] = {
 429                 .shared_vref = true,
 430                 .internal_vref = 2500000,
 431                 .channels = ad5064_channels,
 432                 .num_channels = 8,
 433         },
 434         [ID_AD5668_2] = {
 435                 .shared_vref = true,
 436                 .internal_vref = 5000000,
 437                 .channels = ad5064_channels,
 438                 .num_channels = 8,
 439         },
 440         [ID_AD5669_1] = {
 441                 .shared_vref = true,
 442                 .internal_vref = 2500000,
 443                 .channels = ad5669_channels,
 444                 .num_channels = 8,
 445         },
 446         [ID_AD5669_2] = {
 447                 .shared_vref = true,
 448                 .internal_vref = 5000000,
 449                 .channels = ad5669_channels,
 450                 .num_channels = 8,
 451         },
 452 };
 453
 454 static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
 455 {
 456         return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels;
 457 }
 458
 459 static const char * const ad5064_vref_names[] = {
 460         "vrefA",
 461         "vrefB",
 462         "vrefC",
 463         "vrefD",
 464 };
 465
 466 static const char * const ad5064_vref_name(struct ad5064_state *st,
 467         unsigned int vref)
 468 {
 469         return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];
 470 }
 471
 472 static int ad5064_probe(struct device *dev, enum ad5064_type type,
 473                         const char *name, ad5064_write_func write)
 474 {
 475         struct iio_dev *indio_dev;
 476         struct ad5064_state *st;
 477         unsigned int midscale;
 478         unsigned int i;
 479         int ret;
 480
 481         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 482         if (indio_dev == NULL)
 483                 return  -ENOMEM;
 484
 485         st = iio_priv(indio_dev);
 486         dev_set_drvdata(dev, indio_dev);
 487
 488         st->chip_info = &ad5064_chip_info_tbl[type];
 489         st->dev = dev;
 490         st->write = write;
 491
 492         for (i = 0; i < ad5064_num_vref(st); ++i)
 493                 st->vref_reg[i].supply = ad5064_vref_name(st, i);
 494
 495         ret = devm_regulator_bulk_get(dev, ad5064_num_vref(st),
 496                 st->vref_reg);
 497         if (ret) {
 498                 if (!st->chip_info->internal_vref)
 499                         return ret;
 500                 st->use_internal_vref = true;
 501                 ret = ad5064_write(st, AD5064_CMD_CONFIG, 0,
 502                         AD5064_CONFIG_INT_VREF_ENABLE, 0);
 503                 if (ret) {
 504                         dev_err(dev, "Failed to enable internal vref: %d\n",
 505                                 ret);
 506                         return ret;
 507                 }
 508         } else {
 509                 ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
 510                 if (ret)
 511                         return ret;
 512         }
 513
 514         indio_dev->dev.parent = dev;
 515         indio_dev->name = name;
 516         indio_dev->info = &ad5064_info;
 517         indio_dev->modes = INDIO_DIRECT_MODE;
 518         indio_dev->channels = st->chip_info->channels;
 519         indio_dev->num_channels = st->chip_info->num_channels;
 520
 521         midscale = (1 << indio_dev->channels[0].scan_type.realbits) /  2;
 522
 523         for (i = 0; i < st->chip_info->num_channels; ++i) {
 524                 st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
 525                 st->dac_cache[i] = midscale;
 526         }
 527
 528         ret = iio_device_register(indio_dev);
 529         if (ret)
 530                 goto error_disable_reg;
 531
 532         return 0;
 533
 534 error_disable_reg:
 535         if (!st->use_internal_vref)
 536                 regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
 537
 538         return ret;
 539 }
 540
 541 static int ad5064_remove(struct device *dev)
 542 {
 543         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 544         struct ad5064_state *st = iio_priv(indio_dev);
 545
 546         iio_device_unregister(indio_dev);
 547
 548         if (!st->use_internal_vref)
 549                 regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
 550
 551         return 0;
 552 }
 553
 554 #if IS_ENABLED(CONFIG_SPI_MASTER)
 555
 556 static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
 557         unsigned int addr, unsigned int val)
 558 {
 559         struct spi_device *spi = to_spi_device(st->dev);
 560
 561         st->data.spi = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);
 562         return spi_write(spi, &st->data.spi, sizeof(st->data.spi));
 563 }
 564
 565 static int ad5064_spi_probe(struct spi_device *spi)
 566 {
 567         const struct spi_device_id *id = spi_get_device_id(spi);
 568
 569         return ad5064_probe(&spi->dev, id->driver_data, id->name,
 570                                 ad5064_spi_write);
 571 }
 572
 573 static int ad5064_spi_remove(struct spi_device *spi)
 574 {
 575         return ad5064_remove(&spi->dev);
 576 }
 577
 578 static const struct spi_device_id ad5064_spi_ids[] = {
 579         {"ad5024", ID_AD5024},
 580         {"ad5025", ID_AD5025},
 581         {"ad5044", ID_AD5044},
 582         {"ad5045", ID_AD5045},
 583         {"ad5064", ID_AD5064},
 584         {"ad5064-1", ID_AD5064_1},
 585         {"ad5065", ID_AD5065},
 586         {"ad5628-1", ID_AD5628_1},
 587         {"ad5628-2", ID_AD5628_2},
 588         {"ad5648-1", ID_AD5648_1},
 589         {"ad5648-2", ID_AD5648_2},
 590         {"ad5666-1", ID_AD5666_1},
 591         {"ad5666-2", ID_AD5666_2},
 592         {"ad5668-1", ID_AD5668_1},
 593         {"ad5668-2", ID_AD5668_2},
 594         {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */
 595         {}
 596 };
 597 MODULE_DEVICE_TABLE(spi, ad5064_spi_ids);
 598
 599 static struct spi_driver ad5064_spi_driver = {
 600         .driver = {
 601                    .name = "ad5064",
 602         },
 603         .probe = ad5064_spi_probe,
 604         .remove = ad5064_spi_remove,
 605         .id_table = ad5064_spi_ids,
 606 };
 607
 608 static int __init ad5064_spi_register_driver(void)
 609 {
 610         return spi_register_driver(&ad5064_spi_driver);
 611 }
 612
 613 static void ad5064_spi_unregister_driver(void)
 614 {
 615         spi_unregister_driver(&ad5064_spi_driver);
 616 }
 617
 618 #else
 619
 620 static inline int ad5064_spi_register_driver(void) { return 0; }
 621 static inline void ad5064_spi_unregister_driver(void) { }
 622
 623 #endif
 624
 625 #if IS_ENABLED(CONFIG_I2C)
 626
 627 static int ad5064_i2c_write(struct ad5064_state *st, unsigned int cmd,
 628         unsigned int addr, unsigned int val)
 629 {
 630         struct i2c_client *i2c = to_i2c_client(st->dev);
 631         int ret;
 632
 633         st->data.i2c[0] = (cmd << 4) | addr;
 634         put_unaligned_be16(val, &st->data.i2c[1]);
 635
 636         ret = i2c_master_send(i2c, st->data.i2c, 3);
 637         if (ret < 0)
 638                 return ret;
 639
 640         return 0;
 641 }
 642
 643 static int ad5064_i2c_probe(struct i2c_client *i2c,
 644         const struct i2c_device_id *id)
 645 {
 646         return ad5064_probe(&i2c->dev, id->driver_data, id->name,
 647                                                 ad5064_i2c_write);
 648 }
 649
 650 static int ad5064_i2c_remove(struct i2c_client *i2c)
 651 {
 652         return ad5064_remove(&i2c->dev);
 653 }
 654
 655 static const struct i2c_device_id ad5064_i2c_ids[] = {
 656         {"ad5629-1", ID_AD5629_1},
 657         {"ad5629-2", ID_AD5629_2},
 658         {"ad5629-3", ID_AD5629_2}, /* similar enough to ad5629-2 */
 659         {"ad5669-1", ID_AD5669_1},
 660         {"ad5669-2", ID_AD5669_2},
 661         {"ad5669-3", ID_AD5669_2}, /* similar enough to ad5669-2 */
 662         {}
 663 };
 664 MODULE_DEVICE_TABLE(i2c, ad5064_i2c_ids);
 665
 666 static struct i2c_driver ad5064_i2c_driver = {
 667         .driver = {
 668                    .name = "ad5064",
 669         },
 670         .probe = ad5064_i2c_probe,
 671         .remove = ad5064_i2c_remove,
 672         .id_table = ad5064_i2c_ids,
 673 };
 674
 675 static int __init ad5064_i2c_register_driver(void)
 676 {
 677         return i2c_add_driver(&ad5064_i2c_driver);
 678 }
 679
 680 static void __exit ad5064_i2c_unregister_driver(void)
 681 {
 682         i2c_del_driver(&ad5064_i2c_driver);
 683 }
 684
 685 #else
 686
 687 static inline int ad5064_i2c_register_driver(void) { return 0; }
 688 static inline void ad5064_i2c_unregister_driver(void) { }
 689
 690 #endif
 691
 692 static int __init ad5064_init(void)
 693 {
 694         int ret;
 695
 696         ret = ad5064_spi_register_driver();
 697         if (ret)
 698                 return ret;
 699
 700         ret = ad5064_i2c_register_driver();
 701         if (ret) {
 702                 ad5064_spi_unregister_driver();
 703                 return ret;
 704         }
 705
 706         return 0;
 707 }
 708 module_init(ad5064_init);
 709
 710 static void __exit ad5064_exit(void)
 711 {
 712         ad5064_i2c_unregister_driver();
 713         ad5064_spi_unregister_driver();
 714 }
 715 module_exit(ad5064_exit);
 716
 717 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 718 MODULE_DESCRIPTION("Analog Devices AD5024 and similar multi-channel DACs");
 719 MODULE_LICENSE("GPL v2");