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;
 128                 return IIO_VAL_INT;
 129         case IIO_CHAN_INFO_SCALE:
 130                 *val = st->vref_mv;
 131                 *val2 = chan->scan_type.realbits;
 132                 return IIO_VAL_FRACTIONAL_LOG2;
 133         }
 134         return -EINVAL;
 135 }
 136
 137 static int ad5686_write_raw(struct iio_dev *indio_dev,
 138                             struct iio_chan_spec const *chan,
 139                             int val,
 140                             int val2,
 141                             long mask)
 142 {
 143         struct ad5686_state *st = iio_priv(indio_dev);
 144         int ret;
 145
 146         switch (mask) {
 147         case IIO_CHAN_INFO_RAW:
 148                 if (val > (1 << chan->scan_type.realbits) || val < 0)
 149                         return -EINVAL;
 150
 151                 mutex_lock(&indio_dev->mlock);
 152                 ret = st->write(st,
 153                                 AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
 154                                 chan->address,
 155                                 val << chan->scan_type.shift);
 156                 mutex_unlock(&indio_dev->mlock);
 157                 break;
 158         default:
 159                 ret = -EINVAL;
 160         }
 161
 162         return ret;
 163 }
 164
 165 static const struct iio_info ad5686_info = {
 166         .read_raw = ad5686_read_raw,
 167         .write_raw = ad5686_write_raw,
 168 };
 169
 170 static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
 171         {
 172                 .name = "powerdown",
 173                 .read = ad5686_read_dac_powerdown,
 174                 .write = ad5686_write_dac_powerdown,
 175                 .shared = IIO_SEPARATE,
 176         },
 177         IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5686_powerdown_mode_enum),
 178         IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
 179         { },
 180 };
 181
 182 #define AD5868_CHANNEL(chan, addr, bits, _shift) {              \
 183                 .type = IIO_VOLTAGE,                            \
 184                 .indexed = 1,                                   \
 185                 .output = 1,                                    \
 186                 .channel = chan,                                \
 187                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
 188                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
 189                 .address = addr,                                \
 190                 .scan_type = {                                  \
 191                         .sign = 'u',                            \
 192                         .realbits = (bits),                     \
 193                         .storagebits = 16,                      \
 194                         .shift = (_shift),                      \
 195                 },                                              \
 196                 .ext_info = ad5686_ext_info,                    \
 197 }
 198
 199 #define DECLARE_AD5693_CHANNELS(name, bits, _shift)             \
 200 static struct iio_chan_spec name[] = {                          \
 201                 AD5868_CHANNEL(0, 0, bits, _shift),             \
 202 }
 203
 204 #define DECLARE_AD5686_CHANNELS(name, bits, _shift)             \
 205 static struct iio_chan_spec name[] = {                          \
 206                 AD5868_CHANNEL(0, 1, bits, _shift),             \
 207                 AD5868_CHANNEL(1, 2, bits, _shift),             \
 208                 AD5868_CHANNEL(2, 4, bits, _shift),             \
 209                 AD5868_CHANNEL(3, 8, bits, _shift),             \
 210 }
 211
 212 #define DECLARE_AD5676_CHANNELS(name, bits, _shift)             \
 213 static struct iio_chan_spec name[] = {                          \
 214                 AD5868_CHANNEL(0, 0, bits, _shift),             \
 215                 AD5868_CHANNEL(1, 1, bits, _shift),             \
 216                 AD5868_CHANNEL(2, 2, bits, _shift),             \
 217                 AD5868_CHANNEL(3, 3, bits, _shift),             \
 218                 AD5868_CHANNEL(4, 4, bits, _shift),             \
 219                 AD5868_CHANNEL(5, 5, bits, _shift),             \
 220                 AD5868_CHANNEL(6, 6, bits, _shift),             \
 221                 AD5868_CHANNEL(7, 7, bits, _shift),             \
 222 }
 223
 224 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
 225 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
 226 DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
 227 DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
 228 DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
 229 DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
 230 DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
 231 DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
 232 DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
 233
 234 static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
 235         [ID_AD5311R] = {
 236                 .channels = ad5311r_channels,
 237                 .int_vref_mv = 2500,
 238                 .num_channels = 1,
 239                 .regmap_type = AD5693_REGMAP,
 240         },
 241         [ID_AD5671R] = {
 242                 .channels = ad5672_channels,
 243                 .int_vref_mv = 2500,
 244                 .num_channels = 8,
 245                 .regmap_type = AD5686_REGMAP,
 246         },
 247         [ID_AD5672R] = {
 248                 .channels = ad5672_channels,
 249                 .int_vref_mv = 2500,
 250                 .num_channels = 8,
 251                 .regmap_type = AD5686_REGMAP,
 252         },
 253         [ID_AD5675R] = {
 254                 .channels = ad5676_channels,
 255                 .int_vref_mv = 2500,
 256                 .num_channels = 8,
 257                 .regmap_type = AD5686_REGMAP,
 258         },
 259         [ID_AD5676] = {
 260                 .channels = ad5676_channels,
 261                 .num_channels = 8,
 262                 .regmap_type = AD5686_REGMAP,
 263         },
 264         [ID_AD5676R] = {
 265                 .channels = ad5676_channels,
 266                 .int_vref_mv = 2500,
 267                 .num_channels = 8,
 268                 .regmap_type = AD5686_REGMAP,
 269         },
 270         [ID_AD5681R] = {
 271                 .channels = ad5691r_channels,
 272                 .int_vref_mv = 2500,
 273                 .num_channels = 1,
 274                 .regmap_type = AD5683_REGMAP,
 275         },
 276         [ID_AD5682R] = {
 277                 .channels = ad5692r_channels,
 278                 .int_vref_mv = 2500,
 279                 .num_channels = 1,
 280                 .regmap_type = AD5683_REGMAP,
 281         },
 282         [ID_AD5683] = {
 283                 .channels = ad5693_channels,
 284                 .num_channels = 1,
 285                 .regmap_type = AD5683_REGMAP,
 286         },
 287         [ID_AD5683R] = {
 288                 .channels = ad5693_channels,
 289                 .int_vref_mv = 2500,
 290                 .num_channels = 1,
 291                 .regmap_type = AD5683_REGMAP,
 292         },
 293         [ID_AD5684] = {
 294                 .channels = ad5684_channels,
 295                 .num_channels = 4,
 296                 .regmap_type = AD5686_REGMAP,
 297         },
 298         [ID_AD5684R] = {
 299                 .channels = ad5684_channels,
 300                 .int_vref_mv = 2500,
 301                 .num_channels = 4,
 302                 .regmap_type = AD5686_REGMAP,
 303         },
 304         [ID_AD5685R] = {
 305                 .channels = ad5685r_channels,
 306                 .int_vref_mv = 2500,
 307                 .num_channels = 4,
 308                 .regmap_type = AD5686_REGMAP,
 309         },
 310         [ID_AD5686] = {
 311                 .channels = ad5686_channels,
 312                 .num_channels = 4,
 313                 .regmap_type = AD5686_REGMAP,
 314         },
 315         [ID_AD5686R] = {
 316                 .channels = ad5686_channels,
 317                 .int_vref_mv = 2500,
 318                 .num_channels = 4,
 319                 .regmap_type = AD5686_REGMAP,
 320         },
 321         [ID_AD5691R] = {
 322                 .channels = ad5691r_channels,
 323                 .int_vref_mv = 2500,
 324                 .num_channels = 1,
 325                 .regmap_type = AD5693_REGMAP,
 326         },
 327         [ID_AD5692R] = {
 328                 .channels = ad5692r_channels,
 329                 .int_vref_mv = 2500,
 330                 .num_channels = 1,
 331                 .regmap_type = AD5693_REGMAP,
 332         },
 333         [ID_AD5693] = {
 334                 .channels = ad5693_channels,
 335                 .num_channels = 1,
 336                 .regmap_type = AD5693_REGMAP,
 337         },
 338         [ID_AD5693R] = {
 339                 .channels = ad5693_channels,
 340                 .int_vref_mv = 2500,
 341                 .num_channels = 1,
 342                 .regmap_type = AD5693_REGMAP,
 343         },
 344         [ID_AD5694] = {
 345                 .channels = ad5684_channels,
 346                 .num_channels = 4,
 347                 .regmap_type = AD5686_REGMAP,
 348         },
 349         [ID_AD5694R] = {
 350                 .channels = ad5684_channels,
 351                 .int_vref_mv = 2500,
 352                 .num_channels = 4,
 353                 .regmap_type = AD5686_REGMAP,
 354         },
 355         [ID_AD5696] = {
 356                 .channels = ad5686_channels,
 357                 .num_channels = 4,
 358                 .regmap_type = AD5686_REGMAP,
 359         },
 360         [ID_AD5696R] = {
 361                 .channels = ad5686_channels,
 362                 .int_vref_mv = 2500,
 363                 .num_channels = 4,
 364                 .regmap_type = AD5686_REGMAP,
 365         },
 366 };
 367
 368 int ad5686_probe(struct device *dev,
 369                  enum ad5686_supported_device_ids chip_type,
 370                  const char *name, ad5686_write_func write,
 371                  ad5686_read_func read)
 372 {
 373         struct ad5686_state *st;
 374         struct iio_dev *indio_dev;
 375         unsigned int val, ref_bit_msk;
 376         u8 cmd;
 377         int ret, i, voltage_uv = 0;
 378
 379         indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
 380         if (indio_dev == NULL)
 381                 return  -ENOMEM;
 382
 383         st = iio_priv(indio_dev);
 384         dev_set_drvdata(dev, indio_dev);
 385
 386         st->dev = dev;
 387         st->write = write;
 388         st->read = read;
 389
 390         st->reg = devm_regulator_get_optional(dev, "vcc");
 391         if (!IS_ERR(st->reg)) {
 392                 ret = regulator_enable(st->reg);
 393                 if (ret)
 394                         return ret;
 395
 396                 ret = regulator_get_voltage(st->reg);
 397                 if (ret < 0)
 398                         goto error_disable_reg;
 399
 400                 voltage_uv = ret;
 401         }
 402
 403         st->chip_info = &ad5686_chip_info_tbl[chip_type];
 404
 405         if (voltage_uv)
 406                 st->vref_mv = voltage_uv / 1000;
 407         else
 408                 st->vref_mv = st->chip_info->int_vref_mv;
 409
 410         /* Set all the power down mode for all channels to 1K pulldown */
 411         for (i = 0; i < st->chip_info->num_channels; i++)
 412                 st->pwr_down_mode |= (0x01 << (i * 2));
 413
 414         indio_dev->dev.parent = dev;
 415         indio_dev->name = name;
 416         indio_dev->info = &ad5686_info;
 417         indio_dev->modes = INDIO_DIRECT_MODE;
 418         indio_dev->channels = st->chip_info->channels;
 419         indio_dev->num_channels = st->chip_info->num_channels;
 420
 421         switch (st->chip_info->regmap_type) {
 422         case AD5683_REGMAP:
 423                 cmd = AD5686_CMD_CONTROL_REG;
 424                 ref_bit_msk = AD5683_REF_BIT_MSK;
 425                 st->use_internal_vref = !voltage_uv;
 426                 break;
 427         case AD5686_REGMAP:
 428                 cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
 429                 ref_bit_msk = 0;
 430                 break;
 431         case AD5693_REGMAP:
 432                 cmd = AD5686_CMD_CONTROL_REG;
 433                 ref_bit_msk = AD5693_REF_BIT_MSK;
 434                 st->use_internal_vref = !voltage_uv;
 435                 break;
 436         default:
 437                 ret = -EINVAL;
 438                 goto error_disable_reg;
 439         }
 440
 441         val = (voltage_uv | ref_bit_msk);
 442
 443         ret = st->write(st, cmd, 0, !!val);
 444         if (ret)
 445                 goto error_disable_reg;
 446
 447         ret = iio_device_register(indio_dev);
 448         if (ret)
 449                 goto error_disable_reg;
 450
 451         return 0;
 452
 453 error_disable_reg:
 454         if (!IS_ERR(st->reg))
 455                 regulator_disable(st->reg);
 456         return ret;
 457 }
 458 EXPORT_SYMBOL_GPL(ad5686_probe);
 459
 460 int ad5686_remove(struct device *dev)
 461 {
 462         struct iio_dev *indio_dev = dev_get_drvdata(dev);
 463         struct ad5686_state *st = iio_priv(indio_dev);
 464
 465         iio_device_unregister(indio_dev);
 466         if (!IS_ERR(st->reg))
 467                 regulator_disable(st->reg);
 468
 469         return 0;
 470 }
 471 EXPORT_SYMBOL_GPL(ad5686_remove);
 472
 473 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 474 MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
 475 MODULE_LICENSE("GPL v2");