drivers/iio/dac/ad5686.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * AD5686R, AD5685R, AD5684R Digital to analog converters  driver
   4  *
   5  * Copyright 2011 Analog Devices Inc.
   6  */
   7
   8 #include <linux/interrupt.h>
   9 #include <linux/fs.h>
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/sysfs.h>
  15 #include <linux/regulator/consumer.h>
  16
  17 #include <linux/iio/iio.h>
  18 #include <linux/iio/sysfs.h>
  19
  20 #include "ad5686.h"
  21
  22 static const char * const ad5686_powerdown_modes[] = {
  23         "1kohm_to_gnd",
  24         "100kohm_to_gnd",
  25         "three_state"
  26 };
  27
  28 static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
  29                                      const struct iio_chan_spec *chan)
  30 {
  31         struct ad5686_state *st = iio_priv(indio_dev);
  32
  33         return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
  34 }
  35
  36 static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
  37                                      const struct iio_chan_spec *chan,
  38                                      unsigned int mode)
  39 {
  40         struct ad5686_state *st = iio_priv(indio_dev);
  41
  42         st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
  43         st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));
  44
  45         return 0;
  46 }
  47
  48 static const struct iio_enum ad5686_powerdown_mode_enum = {
  49         .items = ad5686_powerdown_modes,
  50         .num_items = ARRAY_SIZE(ad5686_powerdown_modes),
  51         .get = ad5686_get_powerdown_mode,
  52         .set = ad5686_set_powerdown_mode,
  53 };
  54
  55 static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
  56                 uintptr_t private, const struct iio_chan_spec *chan, char *buf)
  57 {
  58         struct ad5686_state *st = iio_priv(indio_dev);
  59
  60         return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
  61                                        (0x3 << (chan->channel * 2))));
  62 }
  63
  64 static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
  65                                           uintptr_t private,
  66                                           const struct iio_chan_spec *chan,
  67                                           const char *buf,
  68                                           size_t len)
  69 {
  70         bool readin;
  71         int ret;
  72         struct ad5686_state *st = iio_priv(indio_dev);
  73         unsigned int val, ref_bit_msk;
  74         u8 shift;
  75
  76         ret = strtobool(buf, &readin);
  77         if (ret)
  78                 return ret;
  79
  80         if (readin)
  81                 st->pwr_down_mask |= (0x3 << (chan->channel * 2));
  82         else
  83                 st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
  84
  85         switch (st->chip_info->regmap_type) {
  86         case AD5683_REGMAP:
  87                 shift = 13;
  88                 ref_bit_msk = AD5683_REF_BIT_MSK;
  89                 break;
  90         case AD5686_REGMAP:
  91                 shift = 0;
  92                 ref_bit_msk = 0;
  93                 break;
  94         case AD5693_REGMAP:
  95                 shift = 13;
  96                 ref_bit_msk = AD5693_REF_BIT_MSK;
  97                 break;
  98         default:
  99                 return -EINVAL;
 100         }
 101
 102         val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
 103         if (!st->use_internal_vref)
 104                 val |= ref_bit_msk;
 105
 106         ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);
 107
 108         return ret ? ret : len;
 109 }
 110
 111 static int ad5686_read_raw(struct iio_dev *indio_dev,
 112                            struct iio_chan_spec const *chan,
 113                            int *val,
 114                            int *val2,
 115                            long m)
 116 {
 117         struct ad5686_state *st = iio_priv(indio_dev);
 118         int ret;
 119
 120         switch (m) {
 121         case IIO_CHAN_INFO_RAW:
 122                 mutex_lock(&indio_dev->mlock);
 123                 ret = st->read(st, chan->address);
 124                 mutex_unlock(&indio_dev->mlock);
 125                 if (ret < 0)
 126                         return ret;
 127                 *val = (ret >> chan->scan_type.shift) &
 128                         GENMASK(chan->scan_type.realbits - 1, 0);
 129                 return IIO_VAL_INT;
 130         case IIO_CHAN_INFO_SCALE:
 131                 *val = st->vref_mv;
 132                 *val2 = chan->scan_type.realbits;
 133                 return IIO_VAL_FRACTIONAL_LOG2;
 134         }
 135         return -EINVAL;
 136 }
 137
 138 static int ad5686_write_raw(struct iio_dev *indio_dev,
 139                             struct iio_chan_spec const *chan,
 140                             int val,
 141                             int val2,
 142                             long mask)
 143 {
 144         struct ad5686_state *st = iio_priv(indio_dev);
 145         int ret;
 146
 147         switch (mask) {
 148         case IIO_CHAN_INFO_RAW:
 149                 if (val > (1 << chan->scan_type.realbits) || val < 0)
 150                         return -EINVAL;
 151
 152                 mutex_lock(&indio_dev->mlock);
 153                 ret = st->write(st,
 154                                 AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
 155                                 chan->address,
 156                                 val << chan->scan_type.shift);
 157                 mutex_unlock(&indio_dev->mlock);
 158                 break;
 159         default:
 160                 ret = -EINVAL;
 161         }
 162
 163         return ret;
 164 }
 165
 166 static const struct iio_info ad5686_info = {
 167         .read_raw = ad5686_read_raw,
 168         .write_raw = ad5686_write_raw,
 169 };
 170
 171 static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
 172         {
 173                 .name = "powerdown",
 174                 .read = ad5686_read_dac_powerdown,
 175                 .write = ad5686_write_dac_powerdown,
 176                 .shared = IIO_SEPARATE,
 177         },
 178         IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
 179         IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
 180         { },
 181 };
 182
 183 #define AD5868_CHANNEL(chan, addr, bits, _shift) {              \
 184                 .type = IIO_VOLTAGE,                            \
 185                 .indexed = 1,                                   \
 186                 .output = 1,                                    \
 187                 .channel = chan,                                \
 188                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
 189                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
 190                 .address = addr,                                \
 191                 .scan_type = {                                  \
 192                         .sign = 'u',                            \
 193                         .realbits = (bits),                     \
 194                         .storagebits = 16,                      \
 195                         .shift = (_shift),                      \
 196                 },                                              \
 197                 .ext_info = ad5686_ext_info,                    \
 198 }
 199
 200 #define DECLARE_AD5693_CHANNELS(name, bits, _shift)             \
 201 static struct iio_chan_spec name[] = {                          \
 202                 AD5868_CHANNEL(0, 0, bits, _shift),             \
 203 }
 204
 205 #define DECLARE_AD5686_CHANNELS(name, bits, _shift)             \
 206 static struct iio_chan_spec name[] = {                          \
 207                 AD5868_CHANNEL(0, 1, bits, _shift),             \
 208                 AD5868_CHANNEL(1, 2, bits, _shift),             \
 209                 AD5868_CHANNEL(2, 4, bits, _shift),             \
 210                 AD5868_CHANNEL(3, 8, bits, _shift),             \
 211 }
 212
 213 #define DECLARE_AD5676_CHANNELS(name, bits, _shift)             \
 214 static struct iio_chan_spec name[] = {                          \
 215                 AD5868_CHANNEL(0, 0, bits, _shift),             \
 216                 AD5868_CHANNEL(1, 1, bits, _shift),             \
 217                 AD5868_CHANNEL(2, 2, bits, _shift),             \
 218                 AD5868_CHANNEL(3, 3, bits, _shift),             \
 219                 AD5868_CHANNEL(4, 4, bits, _shift),             \
 220                 AD5868_CHANNEL(5, 5, bits, _shift),             \
 221                 AD5868_CHANNEL(6, 6, bits, _shift),             \
 222                 AD5868_CHANNEL(7, 7, bits, _shift),             \
 223 }
 224
 225 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
 226 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
 227 DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
 228 DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
 229 DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
 230 DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
 231 DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
 232 DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
 233 DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
 234
 235 static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
 236         [ID_AD5311R] = {
 237                 .channels = ad5311r_channels,
 238                 .int_vref_mv = 2500,
 239                 .num_channels = 1,
 240                 .regmap_type = AD5693_REGMAP,
 241         },
 242         [ID_AD5671R] = {
 243                 .channels = ad5672_channels,
 244                 .int_vref_mv = 2500,
 245                 .num_channels = 8,
 246                 .regmap_type = AD5686_REGMAP,
 247         },
 248         [ID_AD5672R] = {
 249                 .channels = ad5672_channels,
 250                 .int_vref_mv = 2500,
 251                 .num_channels = 8,
 252                 .regmap_type = AD5686_REGMAP,
 253         },
 254         [ID_AD5675R] = {
 255                 .channels = ad5676_channels,
 256                 .int_vref_mv = 2500,
 257                 .num_channels = 8,
 258                 .regmap_type = AD5686_REGMAP,
 259         },
 260         [ID_AD5676] = {
 261                 .channels = ad5676_channels,
 262                 .num_channels = 8,
 263                 .regmap_type = AD5686_REGMAP,
 264         },
 265         [ID_AD5676R] = {
 266                 .channels = ad5676_channels,
 267                 .int_vref_mv = 2500,
 268                 .num_channels = 8,
 269                 .regmap_type = AD5686_REGMAP,
 270         },
 271         [ID_AD5681R] = {
 272                 .channels = ad5691r_channels,
 273                 .int_vref_mv = 2500,
 274                 .num_channels = 1,
 275                 .regmap_type = AD5683_REGMAP,
 276         },
 277         [ID_AD5682R] = {
 278                 .channels = ad5692r_channels,
 279                 .int_vref_mv = 2500,
 280                 .num_channels = 1,
 281                 .regmap_type = AD5683_REGMAP,
 282         },
 283         [ID_AD5683] = {
 284                 .channels = ad5693_channels,
 285                 .num_channels = 1,
 286                 .regmap_type = AD5683_REGMAP,
 287         },
 288         [ID_AD5683R] = {
 289                 .channels = ad5693_channels,
 290                 .int_vref_mv = 2500,
 291                 .num_channels = 1,
 292                 .regmap_type = AD5683_REGMAP,
 293         },
 294         [ID_AD5684] = {
 295                 .channels = ad5684_channels,
 296                 .num_channels = 4,
 297                 .regmap_type = AD5686_REGMAP,
 298         },
 299         [ID_AD5684R] = {
 300                 .channels = ad5684_channels,
 301                 .int_vref_mv = 2500,
 302                 .num_channels = 4,
 303                 .regmap_type = AD5686_REGMAP,
 304         },
 305         [ID_AD5685R] = {
 306                 .channels = ad5685r_channels,
 307                 .int_vref_mv = 2500,
 308                 .num_channels = 4,
 309                 .regmap_type = AD5686_REGMAP,
 310         },
 311         [ID_AD5686] = {
 312                 .channels = ad5686_channels,
 313                 .num_channels = 4,
 314                 .regmap_type = AD5686_REGMAP,
 315         },
 316         [ID_AD5686R] = {
 317                 .channels = ad5686_channels,
 318                 .int_vref_mv = 2500,
 319                 .num_channels = 4,
 320                 .regmap_type = AD5686_REGMAP,
 321         },
 322         [ID_AD5691R] = {
 323                 .channels = ad5691r_channels,
 324                 .int_vref_mv = 2500,
 325                 .num_channels = 1,
 326                 .regmap_type = AD5693_REGMAP,
 327         },
 328         [ID_AD5692R] = {
 329                 .channels = ad5692r_channels,
 330                 .int_vref_mv = 2500,
 331                 .num_channels = 1,
 332                 .regmap_type = AD5693_REGMAP,
 333         },
 334         [ID_AD5693] = {
 335                 .channels = ad5693_channels,
 336                 .num_channels = 1,
 337                 .regmap_type = AD5693_REGMAP,
 338         },
 339         [ID_AD5693R] = {
 340                 .channels = ad5693_channels,
 341                 .int_vref_mv = 2500,
 342                 .num_channels = 1,
 343                 .regmap_type = AD5693_REGMAP,
 344         },
 345         [ID_AD5694] = {
 346                 .channels = ad5684_channels,
 347                 .num_channels = 4,
 348                 .regmap_type = AD5686_REGMAP,
 349         },
 350         [ID_AD5694R] = {
 351                 .channels = ad5684_channels,
 352                 .int_vref_mv = 2500,
 353                 .num_channels = 4,
 354                 .regmap_type = AD5686_REGMAP,
 355         },
 356         [ID_AD5696] = {
 357                 .channels = ad5686_channels,
 358                 .num_channels = 4,
 359                 .regmap_type = AD5686_REGMAP,
 360         },
 361         [ID_AD5696R] = {
 362                 .channels = ad5686_channels,
 363                 .int_vref_mv = 2500,
 364                 .num_channels = 4,
 365                 .regmap_type = AD5686_REGMAP,
 366         },
 367 };
 368
 369 int ad5686_probe(struct device *dev,
 370                  enum ad5686_supported_device_ids chip_type,
 371                  const char *name, ad5686_write_func write,
 372                  ad5686_read_func read)
 373 {
 374         struct ad5686_state *st;
 375         struct iio_dev *indio_dev;
 376         unsigned int val, ref_bit_msk;
 377         u8 cmd;
 378         int ret, i, voltage_uv = 0;
 379
 380         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 381         if (indio_dev == NULL)
 382                 return  -ENOMEM;
 383
 384         st = iio_priv(indio_dev);
 385         dev_set_drvdata(dev, indio_dev);
 386
 387         st->dev = dev;
 388         st->write = write;
 389         st->read = read;
 390
 391         st->reg = devm_regulator_get_optional(dev, "vcc");
 392         if (!IS_ERR(st->reg)) {
 393                 ret = regulator_enable(st->reg);
 394                 if (ret)
 395                         return ret;
 396
 397                 ret = regulator_get_voltage(st->reg);
 398                 if (ret < 0)
 399                         goto error_disable_reg;
 400
 401                 voltage_uv = ret;
 402         }
 403
 404         st->chip_info = &ad5686_chip_info_tbl[chip_type];
 405
 406         if (voltage_uv)
 407                 st->vref_mv = voltage_uv / 1000;
 408         else
 409                 st->vref_mv = st->chip_info->int_vref_mv;
 410
 411         /* Set all the power down mode for all channels to 1K pulldown */
 412         for (i = 0; i < st->chip_info->num_channels; i++)
 413                 st->pwr_down_mode |= (0x01 << (i * 2));
 414
 415         indio_dev->dev.parent = dev;
 416         indio_dev->name = name;
 417         indio_dev->info = &ad5686_info;
 418         indio_dev->modes = INDIO_DIRECT_MODE;
 419         indio_dev->channels = st->chip_info->channels;
 420         indio_dev->num_channels = st->chip_info->num_channels;
 421
 422         switch (st->chip_info->regmap_type) {
 423         case AD5683_REGMAP:
 424                 cmd = AD5686_CMD_CONTROL_REG;
 425                 ref_bit_msk = AD5683_REF_BIT_MSK;
 426                 st->use_internal_vref = !voltage_uv;
 427                 break;
 428         case AD5686_REGMAP:
 429                 cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
 430                 ref_bit_msk = 0;
 431                 break;
 432         case AD5693_REGMAP:
 433                 cmd = AD5686_CMD_CONTROL_REG;
 434                 ref_bit_msk = AD5693_REF_BIT_MSK;
 435                 st->use_internal_vref = !voltage_uv;
 436                 break;
 437         default:
 438                 ret = -EINVAL;
 439                 goto error_disable_reg;
 440         }
 441
 442         val = (voltage_uv | ref_bit_msk);
 443
 444         ret = st->write(st, cmd, 0, !!val);
 445         if (ret)
 446                 goto error_disable_reg;
 447
 448         ret = iio_device_register(indio_dev);
 449         if (ret)
 450                 goto error_disable_reg;
 451
 452         return 0;
 453
 454 error_disable_reg:
 455         if (!IS_ERR(st->reg))
 456                 regulator_disable(st->reg);
 457         return ret;
 458 }
 459 EXPORT_SYMBOL_GPL(ad5686_probe);
 460
 461 int ad5686_remove(struct device *dev)
 462 {
 463         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 464         struct ad5686_state *st = iio_priv(indio_dev);
 465
 466         iio_device_unregister(indio_dev);
 467         if (!IS_ERR(st->reg))
 468                 regulator_disable(st->reg);
 469
 470         return 0;
 471 }
 472 EXPORT_SYMBOL_GPL(ad5686_remove);
 473
 474 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 475 MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
 476 MODULE_LICENSE("GPL v2");