1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392 4 * multi-channel Digital to Analog Converters driver 5 * 6 * Copyright 2011 Analog Devices Inc. 7 */ 8 9 #include <linux/device.h> 10 #include <linux/err.h> 11 #include <linux/i2c.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/spi/spi.h> 15 #include <linux/slab.h> 16 #include <linux/sysfs.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/consumer.h> 19 20 #include <linux/iio/iio.h> 21 #include <linux/iio/sysfs.h> 22 23 #define AD5380_REG_DATA(x) (((x) << 2) | 3) 24 #define AD5380_REG_OFFSET(x) (((x) << 2) | 2) 25 #define AD5380_REG_GAIN(x) (((x) << 2) | 1) 26 #define AD5380_REG_SF_PWR_DOWN (8 << 2) 27 #define AD5380_REG_SF_PWR_UP (9 << 2) 28 #define AD5380_REG_SF_CTRL (12 << 2) 29 30 #define AD5380_CTRL_PWR_DOWN_MODE_OFFSET 13 31 #define AD5380_CTRL_INT_VREF_2V5 BIT(12) 32 #define AD5380_CTRL_INT_VREF_EN BIT(10) 33 34 /** 35 * struct ad5380_chip_info - chip specific information 36 * @channel_template: channel specification template 37 * @num_channels: number of channels 38 * @int_vref: internal vref in uV 39 */ 40 struct ad5380_chip_info { 41 struct iio_chan_spec channel_template; 42 unsigned int num_channels; 43 unsigned int int_vref; 44 }; 45 46 /** 47 * struct ad5380_state - driver instance specific data 48 * @regmap: regmap instance used by the device 49 * @chip_info: chip model specific constants, available modes etc 50 * @vref_reg: vref supply regulator 51 * @vref: actual reference voltage used in uA 52 * @pwr_down: whether the chip is currently in power down mode 53 * @lock: lock to protect the data buffer during regmap ops 54 */ 55 struct ad5380_state { 56 struct regmap *regmap; 57 const struct ad5380_chip_info *chip_info; 58 struct regulator *vref_reg; 59 int vref; 60 bool pwr_down; 61 struct mutex lock; 62 }; 63 64 enum ad5380_type { 65 ID_AD5380_3, 66 ID_AD5380_5, 67 ID_AD5381_3, 68 ID_AD5381_5, 69 ID_AD5382_3, 70 ID_AD5382_5, 71 ID_AD5383_3, 72 ID_AD5383_5, 73 ID_AD5390_3, 74 ID_AD5390_5, 75 ID_AD5391_3, 76 ID_AD5391_5, 77 ID_AD5392_3, 78 ID_AD5392_5, 79 }; 80 81 static ssize_t ad5380_read_dac_powerdown(struct iio_dev *indio_dev, 82 uintptr_t private, const struct iio_chan_spec *chan, char *buf) 83 { 84 struct ad5380_state *st = iio_priv(indio_dev); 85 86 return sysfs_emit(buf, "%d\n", st->pwr_down); 87 } 88 89 static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev, 90 uintptr_t private, const struct iio_chan_spec *chan, const char *buf, 91 size_t len) 92 { 93 struct ad5380_state *st = iio_priv(indio_dev); 94 bool pwr_down; 95 int ret; 96 97 ret = kstrtobool(buf, &pwr_down); 98 if (ret) 99 return ret; 100 101 mutex_lock(&st->lock); 102 103 if (pwr_down) 104 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0); 105 else 106 ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0); 107 108 st->pwr_down = pwr_down; 109 110 mutex_unlock(&st->lock); 111 112 return ret ? ret : len; 113 } 114 115 static const char * const ad5380_powerdown_modes[] = { 116 "100kohm_to_gnd", 117 "three_state", 118 }; 119 120 static int ad5380_get_powerdown_mode(struct iio_dev *indio_dev, 121 const struct iio_chan_spec *chan) 122 { 123 struct ad5380_state *st = iio_priv(indio_dev); 124 unsigned int mode; 125 int ret; 126 127 ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode); 128 if (ret) 129 return ret; 130 131 mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1; 132 133 return mode; 134 } 135 136 static int ad5380_set_powerdown_mode(struct iio_dev *indio_dev, 137 const struct iio_chan_spec *chan, unsigned int mode) 138 { 139 struct ad5380_state *st = iio_priv(indio_dev); 140 int ret; 141 142 ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL, 143 1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET, 144 mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET); 145 146 return ret; 147 } 148 149 static const struct iio_enum ad5380_powerdown_mode_enum = { 150 .items = ad5380_powerdown_modes, 151 .num_items = ARRAY_SIZE(ad5380_powerdown_modes), 152 .get = ad5380_get_powerdown_mode, 153 .set = ad5380_set_powerdown_mode, 154 }; 155 156 static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan, 157 long info) 158 { 159 switch (info) { 160 case IIO_CHAN_INFO_RAW: 161 return AD5380_REG_DATA(chan->address); 162 case IIO_CHAN_INFO_CALIBBIAS: 163 return AD5380_REG_OFFSET(chan->address); 164 case IIO_CHAN_INFO_CALIBSCALE: 165 return AD5380_REG_GAIN(chan->address); 166 default: 167 break; 168 } 169 170 return 0; 171 } 172 173 static int ad5380_write_raw(struct iio_dev *indio_dev, 174 struct iio_chan_spec const *chan, int val, int val2, long info) 175 { 176 const unsigned int max_val = (1 << chan->scan_type.realbits); 177 struct ad5380_state *st = iio_priv(indio_dev); 178 179 switch (info) { 180 case IIO_CHAN_INFO_RAW: 181 case IIO_CHAN_INFO_CALIBSCALE: 182 if (val >= max_val || val < 0) 183 return -EINVAL; 184 185 return regmap_write(st->regmap, 186 ad5380_info_to_reg(chan, info), 187 val << chan->scan_type.shift); 188 case IIO_CHAN_INFO_CALIBBIAS: 189 val += (1 << chan->scan_type.realbits) / 2; 190 if (val >= max_val || val < 0) 191 return -EINVAL; 192 193 return regmap_write(st->regmap, 194 AD5380_REG_OFFSET(chan->address), 195 val << chan->scan_type.shift); 196 default: 197 break; 198 } 199 return -EINVAL; 200 } 201 202 static int ad5380_read_raw(struct iio_dev *indio_dev, 203 struct iio_chan_spec const *chan, int *val, int *val2, long info) 204 { 205 struct ad5380_state *st = iio_priv(indio_dev); 206 int ret; 207 208 switch (info) { 209 case IIO_CHAN_INFO_RAW: 210 case IIO_CHAN_INFO_CALIBSCALE: 211 ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info), 212 val); 213 if (ret) 214 return ret; 215 *val >>= chan->scan_type.shift; 216 return IIO_VAL_INT; 217 case IIO_CHAN_INFO_CALIBBIAS: 218 ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address), 219 val); 220 if (ret) 221 return ret; 222 *val >>= chan->scan_type.shift; 223 *val -= (1 << chan->scan_type.realbits) / 2; 224 return IIO_VAL_INT; 225 case IIO_CHAN_INFO_SCALE: 226 *val = 2 * st->vref; 227 *val2 = chan->scan_type.realbits; 228 return IIO_VAL_FRACTIONAL_LOG2; 229 default: 230 break; 231 } 232 233 return -EINVAL; 234 } 235 236 static const struct iio_info ad5380_info = { 237 .read_raw = ad5380_read_raw, 238 .write_raw = ad5380_write_raw, 239 }; 240 241 static const struct iio_chan_spec_ext_info ad5380_ext_info[] = { 242 { 243 .name = "powerdown", 244 .read = ad5380_read_dac_powerdown, 245 .write = ad5380_write_dac_powerdown, 246 .shared = IIO_SEPARATE, 247 }, 248 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, 249 &ad5380_powerdown_mode_enum), 250 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5380_powerdown_mode_enum), 251 { }, 252 }; 253 254 #define AD5380_CHANNEL(_bits) { \ 255 .type = IIO_VOLTAGE, \ 256 .indexed = 1, \ 257 .output = 1, \ 258 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 259 BIT(IIO_CHAN_INFO_CALIBSCALE) | \ 260 BIT(IIO_CHAN_INFO_CALIBBIAS), \ 261 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 262 .scan_type = { \ 263 .sign = 'u', \ 264 .realbits = (_bits), \ 265 .storagebits = 16, \ 266 .shift = 14 - (_bits), \ 267 }, \ 268 .ext_info = ad5380_ext_info, \ 269 } 270 271 static const struct ad5380_chip_info ad5380_chip_info_tbl[] = { 272 [ID_AD5380_3] = { 273 .channel_template = AD5380_CHANNEL(14), 274 .num_channels = 40, 275 .int_vref = 1250, 276 }, 277 [ID_AD5380_5] = { 278 .channel_template = AD5380_CHANNEL(14), 279 .num_channels = 40, 280 .int_vref = 2500, 281 }, 282 [ID_AD5381_3] = { 283 .channel_template = AD5380_CHANNEL(12), 284 .num_channels = 16, 285 .int_vref = 1250, 286 }, 287 [ID_AD5381_5] = { 288 .channel_template = AD5380_CHANNEL(12), 289 .num_channels = 16, 290 .int_vref = 2500, 291 }, 292 [ID_AD5382_3] = { 293 .channel_template = AD5380_CHANNEL(14), 294 .num_channels = 32, 295 .int_vref = 1250, 296 }, 297 [ID_AD5382_5] = { 298 .channel_template = AD5380_CHANNEL(14), 299 .num_channels = 32, 300 .int_vref = 2500, 301 }, 302 [ID_AD5383_3] = { 303 .channel_template = AD5380_CHANNEL(12), 304 .num_channels = 32, 305 .int_vref = 1250, 306 }, 307 [ID_AD5383_5] = { 308 .channel_template = AD5380_CHANNEL(12), 309 .num_channels = 32, 310 .int_vref = 2500, 311 }, 312 [ID_AD5390_3] = { 313 .channel_template = AD5380_CHANNEL(14), 314 .num_channels = 16, 315 .int_vref = 1250, 316 }, 317 [ID_AD5390_5] = { 318 .channel_template = AD5380_CHANNEL(14), 319 .num_channels = 16, 320 .int_vref = 2500, 321 }, 322 [ID_AD5391_3] = { 323 .channel_template = AD5380_CHANNEL(12), 324 .num_channels = 16, 325 .int_vref = 1250, 326 }, 327 [ID_AD5391_5] = { 328 .channel_template = AD5380_CHANNEL(12), 329 .num_channels = 16, 330 .int_vref = 2500, 331 }, 332 [ID_AD5392_3] = { 333 .channel_template = AD5380_CHANNEL(14), 334 .num_channels = 8, 335 .int_vref = 1250, 336 }, 337 [ID_AD5392_5] = { 338 .channel_template = AD5380_CHANNEL(14), 339 .num_channels = 8, 340 .int_vref = 2500, 341 }, 342 }; 343 344 static int ad5380_alloc_channels(struct iio_dev *indio_dev) 345 { 346 struct ad5380_state *st = iio_priv(indio_dev); 347 struct iio_chan_spec *channels; 348 unsigned int i; 349 350 channels = kcalloc(st->chip_info->num_channels, 351 sizeof(struct iio_chan_spec), GFP_KERNEL); 352 353 if (!channels) 354 return -ENOMEM; 355 356 for (i = 0; i < st->chip_info->num_channels; ++i) { 357 channels[i] = st->chip_info->channel_template; 358 channels[i].channel = i; 359 channels[i].address = i; 360 } 361 362 indio_dev->channels = channels; 363 364 return 0; 365 } 366 367 static int ad5380_probe(struct device *dev, struct regmap *regmap, 368 enum ad5380_type type, const char *name) 369 { 370 struct iio_dev *indio_dev; 371 struct ad5380_state *st; 372 unsigned int ctrl = 0; 373 int ret; 374 375 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 376 if (indio_dev == NULL) { 377 dev_err(dev, "Failed to allocate iio device\n"); 378 return -ENOMEM; 379 } 380 381 st = iio_priv(indio_dev); 382 dev_set_drvdata(dev, indio_dev); 383 384 st->chip_info = &ad5380_chip_info_tbl[type]; 385 st->regmap = regmap; 386 387 indio_dev->name = name; 388 indio_dev->info = &ad5380_info; 389 indio_dev->modes = INDIO_DIRECT_MODE; 390 indio_dev->num_channels = st->chip_info->num_channels; 391 392 mutex_init(&st->lock); 393 394 ret = ad5380_alloc_channels(indio_dev); 395 if (ret) { 396 dev_err(dev, "Failed to allocate channel spec: %d\n", ret); 397 return ret; 398 } 399 400 if (st->chip_info->int_vref == 2500) 401 ctrl |= AD5380_CTRL_INT_VREF_2V5; 402 403 st->vref_reg = devm_regulator_get(dev, "vref"); 404 if (!IS_ERR(st->vref_reg)) { 405 ret = regulator_enable(st->vref_reg); 406 if (ret) { 407 dev_err(dev, "Failed to enable vref regulators: %d\n", 408 ret); 409 goto error_free_reg; 410 } 411 412 ret = regulator_get_voltage(st->vref_reg); 413 if (ret < 0) 414 goto error_disable_reg; 415 416 st->vref = ret / 1000; 417 } else { 418 st->vref = st->chip_info->int_vref; 419 ctrl |= AD5380_CTRL_INT_VREF_EN; 420 } 421 422 ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl); 423 if (ret) { 424 dev_err(dev, "Failed to write to device: %d\n", ret); 425 goto error_disable_reg; 426 } 427 428 ret = iio_device_register(indio_dev); 429 if (ret) { 430 dev_err(dev, "Failed to register iio device: %d\n", ret); 431 goto error_disable_reg; 432 } 433 434 return 0; 435 436 error_disable_reg: 437 if (!IS_ERR(st->vref_reg)) 438 regulator_disable(st->vref_reg); 439 error_free_reg: 440 kfree(indio_dev->channels); 441 442 return ret; 443 } 444 445 static void ad5380_remove(struct device *dev) 446 { 447 struct iio_dev *indio_dev = dev_get_drvdata(dev); 448 struct ad5380_state *st = iio_priv(indio_dev); 449 450 iio_device_unregister(indio_dev); 451 452 kfree(indio_dev->channels); 453 454 if (!IS_ERR(st->vref_reg)) 455 regulator_disable(st->vref_reg); 456 } 457 458 static bool ad5380_reg_false(struct device *dev, unsigned int reg) 459 { 460 return false; 461 } 462 463 static const struct regmap_config ad5380_regmap_config = { 464 .reg_bits = 10, 465 .val_bits = 14, 466 467 .max_register = AD5380_REG_DATA(40), 468 .cache_type = REGCACHE_RBTREE, 469 470 .volatile_reg = ad5380_reg_false, 471 .readable_reg = ad5380_reg_false, 472 }; 473 474 #if IS_ENABLED(CONFIG_SPI_MASTER) 475 476 static int ad5380_spi_probe(struct spi_device *spi) 477 { 478 const struct spi_device_id *id = spi_get_device_id(spi); 479 struct regmap *regmap; 480 481 regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config); 482 483 if (IS_ERR(regmap)) 484 return PTR_ERR(regmap); 485 486 return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name); 487 } 488 489 static void ad5380_spi_remove(struct spi_device *spi) 490 { 491 ad5380_remove(&spi->dev); 492 } 493 494 static const struct spi_device_id ad5380_spi_ids[] = { 495 { "ad5380-3", ID_AD5380_3 }, 496 { "ad5380-5", ID_AD5380_5 }, 497 { "ad5381-3", ID_AD5381_3 }, 498 { "ad5381-5", ID_AD5381_5 }, 499 { "ad5382-3", ID_AD5382_3 }, 500 { "ad5382-5", ID_AD5382_5 }, 501 { "ad5383-3", ID_AD5383_3 }, 502 { "ad5383-5", ID_AD5383_5 }, 503 { "ad5384-3", ID_AD5380_3 }, 504 { "ad5384-5", ID_AD5380_5 }, 505 { "ad5390-3", ID_AD5390_3 }, 506 { "ad5390-5", ID_AD5390_5 }, 507 { "ad5391-3", ID_AD5391_3 }, 508 { "ad5391-5", ID_AD5391_5 }, 509 { "ad5392-3", ID_AD5392_3 }, 510 { "ad5392-5", ID_AD5392_5 }, 511 { } 512 }; 513 MODULE_DEVICE_TABLE(spi, ad5380_spi_ids); 514 515 static struct spi_driver ad5380_spi_driver = { 516 .driver = { 517 .name = "ad5380", 518 }, 519 .probe = ad5380_spi_probe, 520 .remove = ad5380_spi_remove, 521 .id_table = ad5380_spi_ids, 522 }; 523 524 static inline int ad5380_spi_register_driver(void) 525 { 526 return spi_register_driver(&ad5380_spi_driver); 527 } 528 529 static inline void ad5380_spi_unregister_driver(void) 530 { 531 spi_unregister_driver(&ad5380_spi_driver); 532 } 533 534 #else 535 536 static inline int ad5380_spi_register_driver(void) 537 { 538 return 0; 539 } 540 541 static inline void ad5380_spi_unregister_driver(void) 542 { 543 } 544 545 #endif 546 547 #if IS_ENABLED(CONFIG_I2C) 548 549 static int ad5380_i2c_probe(struct i2c_client *i2c, 550 const struct i2c_device_id *id) 551 { 552 struct regmap *regmap; 553 554 regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config); 555 556 if (IS_ERR(regmap)) 557 return PTR_ERR(regmap); 558 559 return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name); 560 } 561 562 static void ad5380_i2c_remove(struct i2c_client *i2c) 563 { 564 ad5380_remove(&i2c->dev); 565 } 566 567 static const struct i2c_device_id ad5380_i2c_ids[] = { 568 { "ad5380-3", ID_AD5380_3 }, 569 { "ad5380-5", ID_AD5380_5 }, 570 { "ad5381-3", ID_AD5381_3 }, 571 { "ad5381-5", ID_AD5381_5 }, 572 { "ad5382-3", ID_AD5382_3 }, 573 { "ad5382-5", ID_AD5382_5 }, 574 { "ad5383-3", ID_AD5383_3 }, 575 { "ad5383-5", ID_AD5383_5 }, 576 { "ad5384-3", ID_AD5380_3 }, 577 { "ad5384-5", ID_AD5380_5 }, 578 { "ad5390-3", ID_AD5390_3 }, 579 { "ad5390-5", ID_AD5390_5 }, 580 { "ad5391-3", ID_AD5391_3 }, 581 { "ad5391-5", ID_AD5391_5 }, 582 { "ad5392-3", ID_AD5392_3 }, 583 { "ad5392-5", ID_AD5392_5 }, 584 { } 585 }; 586 MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids); 587 588 static struct i2c_driver ad5380_i2c_driver = { 589 .driver = { 590 .name = "ad5380", 591 }, 592 .probe = ad5380_i2c_probe, 593 .remove = ad5380_i2c_remove, 594 .id_table = ad5380_i2c_ids, 595 }; 596 597 static inline int ad5380_i2c_register_driver(void) 598 { 599 return i2c_add_driver(&ad5380_i2c_driver); 600 } 601 602 static inline void ad5380_i2c_unregister_driver(void) 603 { 604 i2c_del_driver(&ad5380_i2c_driver); 605 } 606 607 #else 608 609 static inline int ad5380_i2c_register_driver(void) 610 { 611 return 0; 612 } 613 614 static inline void ad5380_i2c_unregister_driver(void) 615 { 616 } 617 618 #endif 619 620 static int __init ad5380_spi_init(void) 621 { 622 int ret; 623 624 ret = ad5380_spi_register_driver(); 625 if (ret) 626 return ret; 627 628 ret = ad5380_i2c_register_driver(); 629 if (ret) { 630 ad5380_spi_unregister_driver(); 631 return ret; 632 } 633 634 return 0; 635 } 636 module_init(ad5380_spi_init); 637 638 static void __exit ad5380_spi_exit(void) 639 { 640 ad5380_i2c_unregister_driver(); 641 ad5380_spi_unregister_driver(); 642 643 } 644 module_exit(ad5380_spi_exit); 645 646 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 647 MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC"); 648 MODULE_LICENSE("GPL v2"); 649