drivers/iio/dac/ad5064.c

   1 /*
   2  * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R,
   3  * AD5627, AD5627R, AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R,
   4  * AD5666, AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
   5  * LTC2617, LTC2619, LTC2626, LTC2627, LTC2629 Digital to analog converters
   6  * driver
   7  *
   8  * Copyright 2011 Analog Devices Inc.
   9  *
  10  * Licensed under the GPL-2.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/err.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/spi/spi.h>
  18 #include <linux/i2c.h>
  19 #include <linux/slab.h>
  20 #include <linux/sysfs.h>
  21 #include <linux/regulator/consumer.h>
  22 #include <asm/unaligned.h>
  23
  24 #include <linux/iio/iio.h>
  25 #include <linux/iio/sysfs.h>
  26
  27 #define AD5064_MAX_DAC_CHANNELS                 8
  28 #define AD5064_MAX_VREFS                        4
  29
  30 #define AD5064_ADDR(x)                          ((x) << 20)
  31 #define AD5064_CMD(x)                           ((x) << 24)
  32
  33 #define AD5064_ADDR_ALL_DAC                     0xF
  34
  35 #define AD5064_CMD_WRITE_INPUT_N                0x0
  36 #define AD5064_CMD_UPDATE_DAC_N                 0x1
  37 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL     0x2
  38 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_N       0x3
  39 #define AD5064_CMD_POWERDOWN_DAC                0x4
  40 #define AD5064_CMD_CLEAR                        0x5
  41 #define AD5064_CMD_LDAC_MASK                    0x6
  42 #define AD5064_CMD_RESET                        0x7
  43 #define AD5064_CMD_CONFIG                       0x8
  44
  45 #define AD5064_CMD_RESET_V2                     0x5
  46 #define AD5064_CMD_CONFIG_V2                    0x7
  47
  48 #define AD5064_CONFIG_DAISY_CHAIN_ENABLE        BIT(1)
  49 #define AD5064_CONFIG_INT_VREF_ENABLE           BIT(0)
  50
  51 #define AD5064_LDAC_PWRDN_NONE                  0x0
  52 #define AD5064_LDAC_PWRDN_1K                    0x1
  53 #define AD5064_LDAC_PWRDN_100K                  0x2
  54 #define AD5064_LDAC_PWRDN_3STATE                0x3
  55
  56 /**
  57  * enum ad5064_regmap_type - Register layout variant
  58  * @AD5064_REGMAP_ADI: Old Analog Devices register map layout
  59  * @AD5064_REGMAP_ADI2: New Analog Devices register map layout
  60  * @AD5064_REGMAP_LTC: LTC register map layout
  61  */
  62 enum ad5064_regmap_type {
  63         AD5064_REGMAP_ADI,
  64         AD5064_REGMAP_ADI2,
  65         AD5064_REGMAP_LTC,
  66 };
  67
  68 /**
  69  * struct ad5064_chip_info - chip specific information
  70  * @shared_vref:        whether the vref supply is shared between channels
  71  * @internal_vref:      internal reference voltage. 0 if the chip has no
  72                         internal vref.
  73  * @channel:            channel specification
  74  * @num_channels:       number of channels
  75  * @regmap_type:        register map layout variant
  76  */
  77
  78 struct ad5064_chip_info {
  79         bool shared_vref;
  80         unsigned long internal_vref;
  81         const struct iio_chan_spec *channels;
  82         unsigned int num_channels;
  83         enum ad5064_regmap_type regmap_type;
  84 };
  85
  86 struct ad5064_state;
  87
  88 typedef int (*ad5064_write_func)(struct ad5064_state *st, unsigned int cmd,
  89                 unsigned int addr, unsigned int val);
  90
  91 /**
  92  * struct ad5064_state - driver instance specific data
  93  * @dev:                the device for this driver instance
  94  * @chip_info:          chip model specific constants, available modes etc
  95  * @vref_reg:           vref supply regulators
  96  * @pwr_down:           whether channel is powered down
  97  * @pwr_down_mode:      channel's current power down mode
  98  * @dac_cache:          current DAC raw value (chip does not support readback)
  99  * @use_internal_vref:  set to true if the internal reference voltage should be
 100  *                      used.
 101  * @write:              register write callback
 102  * @data:               i2c/spi transfer buffers
 103  */
 104
 105 struct ad5064_state {
 106         struct device                   *dev;
 107         const struct ad5064_chip_info   *chip_info;
 108         struct regulator_bulk_data      vref_reg[AD5064_MAX_VREFS];
 109         bool                            pwr_down[AD5064_MAX_DAC_CHANNELS];
 110         u8                              pwr_down_mode[AD5064_MAX_DAC_CHANNELS];
 111         unsigned int                    dac_cache[AD5064_MAX_DAC_CHANNELS];
 112         bool                            use_internal_vref;
 113
 114         ad5064_write_func               write;
 115
 116         /*
 117          * DMA (thus cache coherency maintenance) requires the
 118          * transfer buffers to live in their own cache lines.
 119          */
 120         union {
 121                 u8 i2c[3];
 122                 __be32 spi;
 123         } data ____cacheline_aligned;
 124 };
 125
 126 enum ad5064_type {
 127         ID_AD5024,
 128         ID_AD5025,
 129         ID_AD5044,
 130         ID_AD5045,
 131         ID_AD5064,
 132         ID_AD5064_1,
 133         ID_AD5065,
 134         ID_AD5625,
 135         ID_AD5625R_1V25,
 136         ID_AD5625R_2V5,
 137         ID_AD5627,
 138         ID_AD5627R_1V25,
 139         ID_AD5627R_2V5,
 140         ID_AD5628_1,
 141         ID_AD5628_2,
 142         ID_AD5629_1,
 143         ID_AD5629_2,
 144         ID_AD5645R_1V25,
 145         ID_AD5645R_2V5,
 146         ID_AD5647R_1V25,
 147         ID_AD5647R_2V5,
 148         ID_AD5648_1,
 149         ID_AD5648_2,
 150         ID_AD5665,
 151         ID_AD5665R_1V25,
 152         ID_AD5665R_2V5,
 153         ID_AD5666_1,
 154         ID_AD5666_2,
 155         ID_AD5667,
 156         ID_AD5667R_1V25,
 157         ID_AD5667R_2V5,
 158         ID_AD5668_1,
 159         ID_AD5668_2,
 160         ID_AD5669_1,
 161         ID_AD5669_2,
 162         ID_LTC2606,
 163         ID_LTC2607,
 164         ID_LTC2609,
 165         ID_LTC2616,
 166         ID_LTC2617,
 167         ID_LTC2619,
 168         ID_LTC2626,
 169         ID_LTC2627,
 170         ID_LTC2629,
 171 };
 172
 173 static int ad5064_write(struct ad5064_state *st, unsigned int cmd,
 174         unsigned int addr, unsigned int val, unsigned int shift)
 175 {
 176         val <<= shift;
 177
 178         return st->write(st, cmd, addr, val);
 179 }
 180
 181 static int ad5064_sync_powerdown_mode(struct ad5064_state *st,
 182         const struct iio_chan_spec *chan)
 183 {
 184         unsigned int val, address;
 185         unsigned int shift;
 186         int ret;
 187
 188         if (st->chip_info->regmap_type == AD5064_REGMAP_LTC) {
 189                 val = 0;
 190                 address = chan->address;
 191         } else {
 192                 if (st->chip_info->regmap_type == AD5064_REGMAP_ADI2)
 193                         shift = 4;
 194                 else
 195                         shift = 8;
 196
 197                 val = (0x1 << chan->address);
 198                 address = 0;
 199
 200                 if (st->pwr_down[chan->channel])
 201                         val |= st->pwr_down_mode[chan->channel] << shift;
 202         }
 203
 204         ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, address, val, 0);
 205
 206         return ret;
 207 }
 208
 209 static const char * const ad5064_powerdown_modes[] = {
 210         "1kohm_to_gnd",
 211         "100kohm_to_gnd",
 212         "three_state",
 213 };
 214
 215 static const char * const ltc2617_powerdown_modes[] = {
 216         "90kohm_to_gnd",
 217 };
 218
 219 static int ad5064_get_powerdown_mode(struct iio_dev *indio_dev,
 220         const struct iio_chan_spec *chan)
 221 {
 222         struct ad5064_state *st = iio_priv(indio_dev);
 223
 224         return st->pwr_down_mode[chan->channel] - 1;
 225 }
 226
 227 static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev,
 228         const struct iio_chan_spec *chan, unsigned int mode)
 229 {
 230         struct ad5064_state *st = iio_priv(indio_dev);
 231         int ret;
 232
 233         mutex_lock(&indio_dev->mlock);
 234         st->pwr_down_mode[chan->channel] = mode + 1;
 235
 236         ret = ad5064_sync_powerdown_mode(st, chan);
 237         mutex_unlock(&indio_dev->mlock);
 238
 239         return ret;
 240 }
 241
 242 static const struct iio_enum ad5064_powerdown_mode_enum = {
 243         .items = ad5064_powerdown_modes,
 244         .num_items = ARRAY_SIZE(ad5064_powerdown_modes),
 245         .get = ad5064_get_powerdown_mode,
 246         .set = ad5064_set_powerdown_mode,
 247 };
 248
 249 static const struct iio_enum ltc2617_powerdown_mode_enum = {
 250         .items = ltc2617_powerdown_modes,
 251         .num_items = ARRAY_SIZE(ltc2617_powerdown_modes),
 252         .get = ad5064_get_powerdown_mode,
 253         .set = ad5064_set_powerdown_mode,
 254 };
 255
 256 static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
 257         uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 258 {
 259         struct ad5064_state *st = iio_priv(indio_dev);
 260
 261         return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
 262 }
 263
 264 static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
 265          uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
 266          size_t len)
 267 {
 268         struct ad5064_state *st = iio_priv(indio_dev);
 269         bool pwr_down;
 270         int ret;
 271
 272         ret = strtobool(buf, &pwr_down);
 273         if (ret)
 274                 return ret;
 275
 276         mutex_lock(&indio_dev->mlock);
 277         st->pwr_down[chan->channel] = pwr_down;
 278
 279         ret = ad5064_sync_powerdown_mode(st, chan);
 280         mutex_unlock(&indio_dev->mlock);
 281         return ret ? ret : len;
 282 }
 283
 284 static int ad5064_get_vref(struct ad5064_state *st,
 285         struct iio_chan_spec const *chan)
 286 {
 287         unsigned int i;
 288
 289         if (st->use_internal_vref)
 290                 return st->chip_info->internal_vref;
 291
 292         i = st->chip_info->shared_vref ? 0 : chan->channel;
 293         return regulator_get_voltage(st->vref_reg[i].consumer);
 294 }
 295
 296 static int ad5064_read_raw(struct iio_dev *indio_dev,
 297                            struct iio_chan_spec const *chan,
 298                            int *val,
 299                            int *val2,
 300                            long m)
 301 {
 302         struct ad5064_state *st = iio_priv(indio_dev);
 303         int scale_uv;
 304
 305         switch (m) {
 306         case IIO_CHAN_INFO_RAW:
 307                 *val = st->dac_cache[chan->channel];
 308                 return IIO_VAL_INT;
 309         case IIO_CHAN_INFO_SCALE:
 310                 scale_uv = ad5064_get_vref(st, chan);
 311                 if (scale_uv < 0)
 312                         return scale_uv;
 313
 314                 *val = scale_uv / 1000;
 315                 *val2 = chan->scan_type.realbits;
 316                 return IIO_VAL_FRACTIONAL_LOG2;
 317         default:
 318                 break;
 319         }
 320         return -EINVAL;
 321 }
 322
 323 static int ad5064_write_raw(struct iio_dev *indio_dev,
 324         struct iio_chan_spec const *chan, int val, int val2, long mask)
 325 {
 326         struct ad5064_state *st = iio_priv(indio_dev);
 327         int ret;
 328
 329         switch (mask) {
 330         case IIO_CHAN_INFO_RAW:
 331                 if (val >= (1 << chan->scan_type.realbits) || val < 0)
 332                         return -EINVAL;
 333
 334                 mutex_lock(&indio_dev->mlock);
 335                 ret = ad5064_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,
 336                                 chan->address, val, chan->scan_type.shift);
 337                 if (ret == 0)
 338                         st->dac_cache[chan->channel] = val;
 339                 mutex_unlock(&indio_dev->mlock);
 340                 break;
 341         default:
 342                 ret = -EINVAL;
 343         }
 344
 345         return ret;
 346 }
 347
 348 static const struct iio_info ad5064_info = {
 349         .read_raw = ad5064_read_raw,
 350         .write_raw = ad5064_write_raw,
 351         .driver_module = THIS_MODULE,
 352 };
 353
 354 static const struct iio_chan_spec_ext_info ad5064_ext_info[] = {
 355         {
 356                 .name = "powerdown",
 357                 .read = ad5064_read_dac_powerdown,
 358                 .write = ad5064_write_dac_powerdown,
 359                 .shared = IIO_SEPARATE,
 360         },
 361         IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5064_powerdown_mode_enum),
 362         IIO_ENUM_AVAILABLE("powerdown_mode", &ad5064_powerdown_mode_enum),
 363         { },
 364 };
 365
 366 static const struct iio_chan_spec_ext_info ltc2617_ext_info[] = {
 367         {
 368                 .name = "powerdown",
 369                 .read = ad5064_read_dac_powerdown,
 370                 .write = ad5064_write_dac_powerdown,
 371                 .shared = IIO_SEPARATE,
 372         },
 373         IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ltc2617_powerdown_mode_enum),
 374         IIO_ENUM_AVAILABLE("powerdown_mode", &ltc2617_powerdown_mode_enum),
 375         { },
 376 };
 377
 378 #define AD5064_CHANNEL(chan, addr, bits, _shift, _ext_info) {           \
 379         .type = IIO_VOLTAGE,                                    \
 380         .indexed = 1,                                           \
 381         .output = 1,                                            \
 382         .channel = (chan),                                      \
 383         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
 384         BIT(IIO_CHAN_INFO_SCALE),                                       \
 385         .address = addr,                                        \
 386         .scan_type = {                                          \
 387                 .sign = 'u',                                    \
 388                 .realbits = (bits),                             \
 389                 .storagebits = 16,                              \
 390                 .shift = (_shift),                              \
 391         },                                                      \
 392         .ext_info = (_ext_info),                                \
 393 }
 394
 395 #define DECLARE_AD5064_CHANNELS(name, bits, shift, ext_info) \
 396 const struct iio_chan_spec name[] = { \
 397         AD5064_CHANNEL(0, 0, bits, shift, ext_info), \
 398         AD5064_CHANNEL(1, 1, bits, shift, ext_info), \
 399         AD5064_CHANNEL(2, 2, bits, shift, ext_info), \
 400         AD5064_CHANNEL(3, 3, bits, shift, ext_info), \
 401         AD5064_CHANNEL(4, 4, bits, shift, ext_info), \
 402         AD5064_CHANNEL(5, 5, bits, shift, ext_info), \
 403         AD5064_CHANNEL(6, 6, bits, shift, ext_info), \
 404         AD5064_CHANNEL(7, 7, bits, shift, ext_info), \
 405 }
 406
 407 #define DECLARE_AD5065_CHANNELS(name, bits, shift, ext_info) \
 408 const struct iio_chan_spec name[] = { \
 409         AD5064_CHANNEL(0, 0, bits, shift, ext_info), \
 410         AD5064_CHANNEL(1, 3, bits, shift, ext_info), \
 411 }
 412
 413 static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8, ad5064_ext_info);
 414 static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6, ad5064_ext_info);
 415 static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4, ad5064_ext_info);
 416
 417 static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8, ad5064_ext_info);
 418 static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6, ad5064_ext_info);
 419 static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4, ad5064_ext_info);
 420
 421 static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4, ad5064_ext_info);
 422 static DECLARE_AD5064_CHANNELS(ad5645_channels, 14, 2, ad5064_ext_info);
 423 static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0, ad5064_ext_info);
 424
 425 static DECLARE_AD5064_CHANNELS(ltc2607_channels, 16, 0, ltc2617_ext_info);
 426 static DECLARE_AD5064_CHANNELS(ltc2617_channels, 14, 2, ltc2617_ext_info);
 427 static DECLARE_AD5064_CHANNELS(ltc2627_channels, 12, 4, ltc2617_ext_info);
 428
 429 static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
 430         [ID_AD5024] = {
 431                 .shared_vref = false,
 432                 .channels = ad5024_channels,
 433                 .num_channels = 4,
 434                 .regmap_type = AD5064_REGMAP_ADI,
 435         },
 436         [ID_AD5025] = {
 437                 .shared_vref = false,
 438                 .channels = ad5025_channels,
 439                 .num_channels = 2,
 440                 .regmap_type = AD5064_REGMAP_ADI,
 441         },
 442         [ID_AD5044] = {
 443                 .shared_vref = false,
 444                 .channels = ad5044_channels,
 445                 .num_channels = 4,
 446                 .regmap_type = AD5064_REGMAP_ADI,
 447         },
 448         [ID_AD5045] = {
 449                 .shared_vref = false,
 450                 .channels = ad5045_channels,
 451                 .num_channels = 2,
 452                 .regmap_type = AD5064_REGMAP_ADI,
 453         },
 454         [ID_AD5064] = {
 455                 .shared_vref = false,
 456                 .channels = ad5064_channels,
 457                 .num_channels = 4,
 458                 .regmap_type = AD5064_REGMAP_ADI,
 459         },
 460         [ID_AD5064_1] = {
 461                 .shared_vref = true,
 462                 .channels = ad5064_channels,
 463                 .num_channels = 4,
 464                 .regmap_type = AD5064_REGMAP_ADI,
 465         },
 466         [ID_AD5065] = {
 467                 .shared_vref = false,
 468                 .channels = ad5065_channels,
 469                 .num_channels = 2,
 470                 .regmap_type = AD5064_REGMAP_ADI,
 471         },
 472         [ID_AD5625] = {
 473                 .shared_vref = true,
 474                 .channels = ad5629_channels,
 475                 .num_channels = 4,
 476                 .regmap_type = AD5064_REGMAP_ADI2
 477         },
 478         [ID_AD5625R_1V25] = {
 479                 .shared_vref = true,
 480                 .internal_vref = 1250000,
 481                 .channels = ad5629_channels,
 482                 .num_channels = 4,
 483                 .regmap_type = AD5064_REGMAP_ADI2
 484         },
 485         [ID_AD5625R_2V5] = {
 486                 .shared_vref = true,
 487                 .internal_vref = 2500000,
 488                 .channels = ad5629_channels,
 489                 .num_channels = 4,
 490                 .regmap_type = AD5064_REGMAP_ADI2
 491         },
 492         [ID_AD5627] = {
 493                 .shared_vref = true,
 494                 .channels = ad5629_channels,
 495                 .num_channels = 2,
 496                 .regmap_type = AD5064_REGMAP_ADI2
 497         },
 498         [ID_AD5627R_1V25] = {
 499                 .shared_vref = true,
 500                 .internal_vref = 1250000,
 501                 .channels = ad5629_channels,
 502                 .num_channels = 2,
 503                 .regmap_type = AD5064_REGMAP_ADI2
 504         },
 505         [ID_AD5627R_2V5] = {
 506                 .shared_vref = true,
 507                 .internal_vref = 2500000,
 508                 .channels = ad5629_channels,
 509                 .num_channels = 2,
 510                 .regmap_type = AD5064_REGMAP_ADI2
 511         },
 512         [ID_AD5628_1] = {
 513                 .shared_vref = true,
 514                 .internal_vref = 2500000,
 515                 .channels = ad5024_channels,
 516                 .num_channels = 8,
 517                 .regmap_type = AD5064_REGMAP_ADI,
 518         },
 519         [ID_AD5628_2] = {
 520                 .shared_vref = true,
 521                 .internal_vref = 5000000,
 522                 .channels = ad5024_channels,
 523                 .num_channels = 8,
 524                 .regmap_type = AD5064_REGMAP_ADI,
 525         },
 526         [ID_AD5629_1] = {
 527                 .shared_vref = true,
 528                 .internal_vref = 2500000,
 529                 .channels = ad5629_channels,
 530                 .num_channels = 8,
 531                 .regmap_type = AD5064_REGMAP_ADI,
 532         },
 533         [ID_AD5629_2] = {
 534                 .shared_vref = true,
 535                 .internal_vref = 5000000,
 536                 .channels = ad5629_channels,
 537                 .num_channels = 8,
 538                 .regmap_type = AD5064_REGMAP_ADI,
 539         },
 540         [ID_AD5645R_1V25] = {
 541                 .shared_vref = true,
 542                 .internal_vref = 1250000,
 543                 .channels = ad5645_channels,
 544                 .num_channels = 4,
 545                 .regmap_type = AD5064_REGMAP_ADI2
 546         },
 547         [ID_AD5645R_2V5] = {
 548                 .shared_vref = true,
 549                 .internal_vref = 2500000,
 550                 .channels = ad5645_channels,
 551                 .num_channels = 4,
 552                 .regmap_type = AD5064_REGMAP_ADI2
 553         },
 554         [ID_AD5647R_1V25] = {
 555                 .shared_vref = true,
 556                 .internal_vref = 1250000,
 557                 .channels = ad5645_channels,
 558                 .num_channels = 2,
 559                 .regmap_type = AD5064_REGMAP_ADI2
 560         },
 561         [ID_AD5647R_2V5] = {
 562                 .shared_vref = true,
 563                 .internal_vref = 2500000,
 564                 .channels = ad5645_channels,
 565                 .num_channels = 2,
 566                 .regmap_type = AD5064_REGMAP_ADI2
 567         },
 568         [ID_AD5648_1] = {
 569                 .shared_vref = true,
 570                 .internal_vref = 2500000,
 571                 .channels = ad5044_channels,
 572                 .num_channels = 8,
 573                 .regmap_type = AD5064_REGMAP_ADI,
 574         },
 575         [ID_AD5648_2] = {
 576                 .shared_vref = true,
 577                 .internal_vref = 5000000,
 578                 .channels = ad5044_channels,
 579                 .num_channels = 8,
 580                 .regmap_type = AD5064_REGMAP_ADI,
 581         },
 582         [ID_AD5665] = {
 583                 .shared_vref = true,
 584                 .channels = ad5669_channels,
 585                 .num_channels = 4,
 586                 .regmap_type = AD5064_REGMAP_ADI2
 587         },
 588         [ID_AD5665R_1V25] = {
 589                 .shared_vref = true,
 590                 .internal_vref = 1250000,
 591                 .channels = ad5669_channels,
 592                 .num_channels = 4,
 593                 .regmap_type = AD5064_REGMAP_ADI2
 594         },
 595         [ID_AD5665R_2V5] = {
 596                 .shared_vref = true,
 597                 .internal_vref = 2500000,
 598                 .channels = ad5669_channels,
 599                 .num_channels = 4,
 600                 .regmap_type = AD5064_REGMAP_ADI2
 601         },
 602         [ID_AD5666_1] = {
 603                 .shared_vref = true,
 604                 .internal_vref = 2500000,
 605                 .channels = ad5064_channels,
 606                 .num_channels = 4,
 607                 .regmap_type = AD5064_REGMAP_ADI,
 608         },
 609         [ID_AD5666_2] = {
 610                 .shared_vref = true,
 611                 .internal_vref = 5000000,
 612                 .channels = ad5064_channels,
 613                 .num_channels = 4,
 614                 .regmap_type = AD5064_REGMAP_ADI,
 615         },
 616         [ID_AD5667] = {
 617                 .shared_vref = true,
 618                 .channels = ad5669_channels,
 619                 .num_channels = 2,
 620                 .regmap_type = AD5064_REGMAP_ADI2
 621         },
 622         [ID_AD5667R_1V25] = {
 623                 .shared_vref = true,
 624                 .internal_vref = 1250000,
 625                 .channels = ad5669_channels,
 626                 .num_channels = 2,
 627                 .regmap_type = AD5064_REGMAP_ADI2
 628         },
 629         [ID_AD5667R_2V5] = {
 630                 .shared_vref = true,
 631                 .internal_vref = 2500000,
 632                 .channels = ad5669_channels,
 633                 .num_channels = 2,
 634                 .regmap_type = AD5064_REGMAP_ADI2
 635         },
 636         [ID_AD5668_1] = {
 637                 .shared_vref = true,
 638                 .internal_vref = 2500000,
 639                 .channels = ad5064_channels,
 640                 .num_channels = 8,
 641                 .regmap_type = AD5064_REGMAP_ADI,
 642         },
 643         [ID_AD5668_2] = {
 644                 .shared_vref = true,
 645                 .internal_vref = 5000000,
 646                 .channels = ad5064_channels,
 647                 .num_channels = 8,
 648                 .regmap_type = AD5064_REGMAP_ADI,
 649         },
 650         [ID_AD5669_1] = {
 651                 .shared_vref = true,
 652                 .internal_vref = 2500000,
 653                 .channels = ad5669_channels,
 654                 .num_channels = 8,
 655                 .regmap_type = AD5064_REGMAP_ADI,
 656         },
 657         [ID_AD5669_2] = {
 658                 .shared_vref = true,
 659                 .internal_vref = 5000000,
 660                 .channels = ad5669_channels,
 661                 .num_channels = 8,
 662                 .regmap_type = AD5064_REGMAP_ADI,
 663         },
 664         [ID_LTC2606] = {
 665                 .shared_vref = true,
 666                 .internal_vref = 0,
 667                 .channels = ltc2607_channels,
 668                 .num_channels = 1,
 669                 .regmap_type = AD5064_REGMAP_LTC,
 670         },
 671         [ID_LTC2607] = {
 672                 .shared_vref = true,
 673                 .internal_vref = 0,
 674                 .channels = ltc2607_channels,
 675                 .num_channels = 2,
 676                 .regmap_type = AD5064_REGMAP_LTC,
 677         },
 678         [ID_LTC2609] = {
 679                 .shared_vref = false,
 680                 .internal_vref = 0,
 681                 .channels = ltc2607_channels,
 682                 .num_channels = 4,
 683                 .regmap_type = AD5064_REGMAP_LTC,
 684         },
 685         [ID_LTC2616] = {
 686                 .shared_vref = true,
 687                 .internal_vref = 0,
 688                 .channels = ltc2617_channels,
 689                 .num_channels = 1,
 690                 .regmap_type = AD5064_REGMAP_LTC,
 691         },
 692         [ID_LTC2617] = {
 693                 .shared_vref = true,
 694                 .internal_vref = 0,
 695                 .channels = ltc2617_channels,
 696                 .num_channels = 2,
 697                 .regmap_type = AD5064_REGMAP_LTC,
 698         },
 699         [ID_LTC2619] = {
 700                 .shared_vref = false,
 701                 .internal_vref = 0,
 702                 .channels = ltc2617_channels,
 703                 .num_channels = 4,
 704                 .regmap_type = AD5064_REGMAP_LTC,
 705         },
 706         [ID_LTC2626] = {
 707                 .shared_vref = true,
 708                 .internal_vref = 0,
 709                 .channels = ltc2627_channels,
 710                 .num_channels = 1,
 711                 .regmap_type = AD5064_REGMAP_LTC,
 712         },
 713         [ID_LTC2627] = {
 714                 .shared_vref = true,
 715                 .internal_vref = 0,
 716                 .channels = ltc2627_channels,
 717                 .num_channels = 2,
 718                 .regmap_type = AD5064_REGMAP_LTC,
 719         },
 720         [ID_LTC2629] = {
 721                 .shared_vref = false,
 722                 .internal_vref = 0,
 723                 .channels = ltc2627_channels,
 724                 .num_channels = 4,
 725                 .regmap_type = AD5064_REGMAP_LTC,
 726         },
 727 };
 728
 729 static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
 730 {
 731         return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels;
 732 }
 733
 734 static const char * const ad5064_vref_names[] = {
 735         "vrefA",
 736         "vrefB",
 737         "vrefC",
 738         "vrefD",
 739 };
 740
 741 static const char * const ad5064_vref_name(struct ad5064_state *st,
 742         unsigned int vref)
 743 {
 744         return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];
 745 }
 746
 747 static int ad5064_set_config(struct ad5064_state *st, unsigned int val)
 748 {
 749         unsigned int cmd;
 750
 751         switch (st->chip_info->regmap_type) {
 752         case AD5064_REGMAP_ADI2:
 753                 cmd = AD5064_CMD_CONFIG_V2;
 754                 break;
 755         default:
 756                 cmd = AD5064_CMD_CONFIG;
 757                 break;
 758         }
 759
 760         return ad5064_write(st, cmd, 0, val, 0);
 761 }
 762
 763 static int ad5064_request_vref(struct ad5064_state *st, struct device *dev)
 764 {
 765         unsigned int i;
 766         int ret;
 767
 768         for (i = 0; i < ad5064_num_vref(st); ++i)
 769                 st->vref_reg[i].supply = ad5064_vref_name(st, i);
 770
 771         if (!st->chip_info->internal_vref)
 772                 return devm_regulator_bulk_get(dev, ad5064_num_vref(st),
 773                                                st->vref_reg);
 774
 775         /*
 776          * This assumes that when the regulator has an internal VREF
 777          * there is only one external VREF connection, which is
 778          * currently the case for all supported devices.
 779          */
 780         st->vref_reg[0].consumer = devm_regulator_get_optional(dev, "vref");
 781         if (!IS_ERR(st->vref_reg[0].consumer))
 782                 return 0;
 783
 784         ret = PTR_ERR(st->vref_reg[0].consumer);
 785         if (ret != -ENODEV)
 786                 return ret;
 787
 788         /* If no external regulator was supplied use the internal VREF */
 789         st->use_internal_vref = true;
 790         ret = ad5064_set_config(st, AD5064_CONFIG_INT_VREF_ENABLE);
 791         if (ret)
 792                 dev_err(dev, "Failed to enable internal vref: %d\n", ret);
 793
 794         return ret;
 795 }
 796
 797 static int ad5064_probe(struct device *dev, enum ad5064_type type,
 798                         const char *name, ad5064_write_func write)
 799 {
 800         struct iio_dev *indio_dev;
 801         struct ad5064_state *st;
 802         unsigned int midscale;
 803         unsigned int i;
 804         int ret;
 805
 806         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 807         if (indio_dev == NULL)
 808                 return  -ENOMEM;
 809
 810         st = iio_priv(indio_dev);
 811         dev_set_drvdata(dev, indio_dev);
 812
 813         st->chip_info = &ad5064_chip_info_tbl[type];
 814         st->dev = dev;
 815         st->write = write;
 816
 817         ret = ad5064_request_vref(st, dev);
 818         if (ret)
 819                 return ret;
 820
 821         if (!st->use_internal_vref) {
 822                 ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
 823                 if (ret)
 824                         return ret;
 825         }
 826
 827         indio_dev->dev.parent = dev;
 828         indio_dev->name = name;
 829         indio_dev->info = &ad5064_info;
 830         indio_dev->modes = INDIO_DIRECT_MODE;
 831         indio_dev->channels = st->chip_info->channels;
 832         indio_dev->num_channels = st->chip_info->num_channels;
 833
 834         midscale = (1 << indio_dev->channels[0].scan_type.realbits) /  2;
 835
 836         for (i = 0; i < st->chip_info->num_channels; ++i) {
 837                 st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
 838                 st->dac_cache[i] = midscale;
 839         }
 840
 841         ret = iio_device_register(indio_dev);
 842         if (ret)
 843                 goto error_disable_reg;
 844
 845         return 0;
 846
 847 error_disable_reg:
 848         if (!st->use_internal_vref)
 849                 regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
 850
 851         return ret;
 852 }
 853
 854 static int ad5064_remove(struct device *dev)
 855 {
 856         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 857         struct ad5064_state *st = iio_priv(indio_dev);
 858
 859         iio_device_unregister(indio_dev);
 860
 861         if (!st->use_internal_vref)
 862                 regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
 863
 864         return 0;
 865 }
 866
 867 #if IS_ENABLED(CONFIG_SPI_MASTER)
 868
 869 static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
 870         unsigned int addr, unsigned int val)
 871 {
 872         struct spi_device *spi = to_spi_device(st->dev);
 873
 874         st->data.spi = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);
 875         return spi_write(spi, &st->data.spi, sizeof(st->data.spi));
 876 }
 877
 878 static int ad5064_spi_probe(struct spi_device *spi)
 879 {
 880         const struct spi_device_id *id = spi_get_device_id(spi);
 881
 882         return ad5064_probe(&spi->dev, id->driver_data, id->name,
 883                                 ad5064_spi_write);
 884 }
 885
 886 static int ad5064_spi_remove(struct spi_device *spi)
 887 {
 888         return ad5064_remove(&spi->dev);
 889 }
 890
 891 static const struct spi_device_id ad5064_spi_ids[] = {
 892         {"ad5024", ID_AD5024},
 893         {"ad5025", ID_AD5025},
 894         {"ad5044", ID_AD5044},
 895         {"ad5045", ID_AD5045},
 896         {"ad5064", ID_AD5064},
 897         {"ad5064-1", ID_AD5064_1},
 898         {"ad5065", ID_AD5065},
 899         {"ad5628-1", ID_AD5628_1},
 900         {"ad5628-2", ID_AD5628_2},
 901         {"ad5648-1", ID_AD5648_1},
 902         {"ad5648-2", ID_AD5648_2},
 903         {"ad5666-1", ID_AD5666_1},
 904         {"ad5666-2", ID_AD5666_2},
 905         {"ad5668-1", ID_AD5668_1},
 906         {"ad5668-2", ID_AD5668_2},
 907         {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */
 908         {}
 909 };
 910 MODULE_DEVICE_TABLE(spi, ad5064_spi_ids);
 911
 912 static struct spi_driver ad5064_spi_driver = {
 913         .driver = {
 914                    .name = "ad5064",
 915         },
 916         .probe = ad5064_spi_probe,
 917         .remove = ad5064_spi_remove,
 918         .id_table = ad5064_spi_ids,
 919 };
 920
 921 static int __init ad5064_spi_register_driver(void)
 922 {
 923         return spi_register_driver(&ad5064_spi_driver);
 924 }
 925
 926 static void ad5064_spi_unregister_driver(void)
 927 {
 928         spi_unregister_driver(&ad5064_spi_driver);
 929 }
 930
 931 #else
 932
 933 static inline int ad5064_spi_register_driver(void) { return 0; }
 934 static inline void ad5064_spi_unregister_driver(void) { }
 935
 936 #endif
 937
 938 #if IS_ENABLED(CONFIG_I2C)
 939
 940 static int ad5064_i2c_write(struct ad5064_state *st, unsigned int cmd,
 941         unsigned int addr, unsigned int val)
 942 {
 943         struct i2c_client *i2c = to_i2c_client(st->dev);
 944         unsigned int cmd_shift;
 945         int ret;
 946
 947         switch (st->chip_info->regmap_type) {
 948         case AD5064_REGMAP_ADI2:
 949                 cmd_shift = 3;
 950                 break;
 951         default:
 952                 cmd_shift = 4;
 953                 break;
 954         }
 955
 956         st->data.i2c[0] = (cmd << cmd_shift) | addr;
 957         put_unaligned_be16(val, &st->data.i2c[1]);
 958
 959         ret = i2c_master_send(i2c, st->data.i2c, 3);
 960         if (ret < 0)
 961                 return ret;
 962
 963         return 0;
 964 }
 965
 966 static int ad5064_i2c_probe(struct i2c_client *i2c,
 967         const struct i2c_device_id *id)
 968 {
 969         return ad5064_probe(&i2c->dev, id->driver_data, id->name,
 970                                                 ad5064_i2c_write);
 971 }
 972
 973 static int ad5064_i2c_remove(struct i2c_client *i2c)
 974 {
 975         return ad5064_remove(&i2c->dev);
 976 }
 977
 978 static const struct i2c_device_id ad5064_i2c_ids[] = {
 979         {"ad5625", ID_AD5625 },
 980         {"ad5625r-1v25", ID_AD5625R_1V25 },
 981         {"ad5625r-2v5", ID_AD5625R_2V5 },
 982         {"ad5627", ID_AD5627 },
 983         {"ad5627r-1v25", ID_AD5627R_1V25 },
 984         {"ad5627r-2v5", ID_AD5627R_2V5 },
 985         {"ad5629-1", ID_AD5629_1},
 986         {"ad5629-2", ID_AD5629_2},
 987         {"ad5629-3", ID_AD5629_2}, /* similar enough to ad5629-2 */
 988         {"ad5645r-1v25", ID_AD5645R_1V25 },
 989         {"ad5645r-2v5", ID_AD5645R_2V5 },
 990         {"ad5665", ID_AD5665 },
 991         {"ad5665r-1v25", ID_AD5665R_1V25 },
 992         {"ad5665r-2v5", ID_AD5665R_2V5 },
 993         {"ad5667", ID_AD5667 },
 994         {"ad5667r-1v25", ID_AD5667R_1V25 },
 995         {"ad5667r-2v5", ID_AD5667R_2V5 },
 996         {"ad5669-1", ID_AD5669_1},
 997         {"ad5669-2", ID_AD5669_2},
 998         {"ad5669-3", ID_AD5669_2}, /* similar enough to ad5669-2 */
 999         {"ltc2606", ID_LTC2606},
1000         {"ltc2607", ID_LTC2607},
1001         {"ltc2609", ID_LTC2609},
1002         {"ltc2616", ID_LTC2616},
1003         {"ltc2617", ID_LTC2617},
1004         {"ltc2619", ID_LTC2619},
1005         {"ltc2626", ID_LTC2626},
1006         {"ltc2627", ID_LTC2627},
1007         {"ltc2629", ID_LTC2629},
1008         {}
1009 };
1010 MODULE_DEVICE_TABLE(i2c, ad5064_i2c_ids);
1011
1012 static struct i2c_driver ad5064_i2c_driver = {
1013         .driver = {
1014                    .name = "ad5064",
1015         },
1016         .probe = ad5064_i2c_probe,
1017         .remove = ad5064_i2c_remove,
1018         .id_table = ad5064_i2c_ids,
1019 };
1020
1021 static int __init ad5064_i2c_register_driver(void)
1022 {
1023         return i2c_add_driver(&ad5064_i2c_driver);
1024 }
1025
1026 static void __exit ad5064_i2c_unregister_driver(void)
1027 {
1028         i2c_del_driver(&ad5064_i2c_driver);
1029 }
1030
1031 #else
1032
1033 static inline int ad5064_i2c_register_driver(void) { return 0; }
1034 static inline void ad5064_i2c_unregister_driver(void) { }
1035
1036 #endif
1037
1038 static int __init ad5064_init(void)
1039 {
1040         int ret;
1041
1042         ret = ad5064_spi_register_driver();
1043         if (ret)
1044                 return ret;
1045
1046         ret = ad5064_i2c_register_driver();
1047         if (ret) {
1048                 ad5064_spi_unregister_driver();
1049                 return ret;
1050         }
1051
1052         return 0;
1053 }
1054 module_init(ad5064_init);
1055
1056 static void __exit ad5064_exit(void)
1057 {
1058         ad5064_i2c_unregister_driver();
1059         ad5064_spi_unregister_driver();
1060 }
1061 module_exit(ad5064_exit);
1062
1063 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
1064 MODULE_DESCRIPTION("Analog Devices AD5024 and similar multi-channel DACs");
1065 MODULE_LICENSE("GPL v2");