1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R, 4 * AD5627, AD5627R, AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R, 5 * AD5666, AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616, 6 * LTC2617, LTC2619, LTC2626, LTC2627, LTC2629, LTC2631, LTC2633, LTC2635 7 * Digital to analog converters driver 8 * 9 * Copyright 2011 Analog Devices Inc. 10 */ 11 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/spi/spi.h> 17 #include <linux/i2c.h> 18 #include <linux/slab.h> 19 #include <linux/sysfs.h> 20 #include <linux/regulator/consumer.h> 21 #include <asm/unaligned.h> 22 23 #include <linux/iio/iio.h> 24 #include <linux/iio/sysfs.h> 25 26 #define AD5064_MAX_DAC_CHANNELS 8 27 #define AD5064_MAX_VREFS 4 28 29 #define AD5064_ADDR(x) ((x) << 20) 30 #define AD5064_CMD(x) ((x) << 24) 31 32 #define AD5064_ADDR_ALL_DAC 0xF 33 34 #define AD5064_CMD_WRITE_INPUT_N 0x0 35 #define AD5064_CMD_UPDATE_DAC_N 0x1 36 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2 37 #define AD5064_CMD_WRITE_INPUT_N_UPDATE_N 0x3 38 #define AD5064_CMD_POWERDOWN_DAC 0x4 39 #define AD5064_CMD_CLEAR 0x5 40 #define AD5064_CMD_LDAC_MASK 0x6 41 #define AD5064_CMD_RESET 0x7 42 #define AD5064_CMD_CONFIG 0x8 43 44 #define AD5064_CMD_RESET_V2 0x5 45 #define AD5064_CMD_CONFIG_V2 0x7 46 47 #define AD5064_CONFIG_DAISY_CHAIN_ENABLE BIT(1) 48 #define AD5064_CONFIG_INT_VREF_ENABLE BIT(0) 49 50 #define AD5064_LDAC_PWRDN_NONE 0x0 51 #define AD5064_LDAC_PWRDN_1K 0x1 52 #define AD5064_LDAC_PWRDN_100K 0x2 53 #define AD5064_LDAC_PWRDN_3STATE 0x3 54 55 /** 56 * enum ad5064_regmap_type - Register layout variant 57 * @AD5064_REGMAP_ADI: Old Analog Devices register map layout 58 * @AD5064_REGMAP_ADI2: New Analog Devices register map layout 59 * @AD5064_REGMAP_LTC: LTC register map layout 60 */ 61 enum ad5064_regmap_type { 62 AD5064_REGMAP_ADI, 63 AD5064_REGMAP_ADI2, 64 AD5064_REGMAP_LTC, 65 }; 66 67 /** 68 * struct ad5064_chip_info - chip specific information 69 * @shared_vref: whether the vref supply is shared between channels 70 * @internal_vref: internal reference voltage. 0 if the chip has no 71 * internal vref. 72 * @channels: channel specification 73 * @num_channels: number of channels 74 * @regmap_type: register map layout variant 75 */ 76 77 struct ad5064_chip_info { 78 bool shared_vref; 79 unsigned long internal_vref; 80 const struct iio_chan_spec *channels; 81 unsigned int num_channels; 82 enum ad5064_regmap_type regmap_type; 83 }; 84 85 struct ad5064_state; 86 87 typedef int (*ad5064_write_func)(struct ad5064_state *st, unsigned int cmd, 88 unsigned int addr, unsigned int val); 89 90 /** 91 * struct ad5064_state - driver instance specific data 92 * @dev: the device for this driver instance 93 * @chip_info: chip model specific constants, available modes etc 94 * @vref_reg: vref supply regulators 95 * @pwr_down: whether channel is powered down 96 * @pwr_down_mode: channel's current power down mode 97 * @dac_cache: current DAC raw value (chip does not support readback) 98 * @use_internal_vref: set to true if the internal reference voltage should be 99 * used. 100 * @write: register write callback 101 * @lock: maintain consistency between cached and dev state 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 struct mutex lock; 116 117 /* 118 * DMA (thus cache coherency maintenance) may require the 119 * transfer buffers to live in their own cache lines. 120 */ 121 union { 122 u8 i2c[3]; 123 __be32 spi; 124 } data __aligned(IIO_DMA_MINALIGN); 125 }; 126 127 enum ad5064_type { 128 ID_AD5024, 129 ID_AD5025, 130 ID_AD5044, 131 ID_AD5045, 132 ID_AD5064, 133 ID_AD5064_1, 134 ID_AD5065, 135 ID_AD5625, 136 ID_AD5625R_1V25, 137 ID_AD5625R_2V5, 138 ID_AD5627, 139 ID_AD5627R_1V25, 140 ID_AD5627R_2V5, 141 ID_AD5628_1, 142 ID_AD5628_2, 143 ID_AD5629_1, 144 ID_AD5629_2, 145 ID_AD5645R_1V25, 146 ID_AD5645R_2V5, 147 ID_AD5647R_1V25, 148 ID_AD5647R_2V5, 149 ID_AD5648_1, 150 ID_AD5648_2, 151 ID_AD5665, 152 ID_AD5665R_1V25, 153 ID_AD5665R_2V5, 154 ID_AD5666_1, 155 ID_AD5666_2, 156 ID_AD5667, 157 ID_AD5667R_1V25, 158 ID_AD5667R_2V5, 159 ID_AD5668_1, 160 ID_AD5668_2, 161 ID_AD5669_1, 162 ID_AD5669_2, 163 ID_LTC2606, 164 ID_LTC2607, 165 ID_LTC2609, 166 ID_LTC2616, 167 ID_LTC2617, 168 ID_LTC2619, 169 ID_LTC2626, 170 ID_LTC2627, 171 ID_LTC2629, 172 ID_LTC2631_L12, 173 ID_LTC2631_H12, 174 ID_LTC2631_L10, 175 ID_LTC2631_H10, 176 ID_LTC2631_L8, 177 ID_LTC2631_H8, 178 ID_LTC2633_L12, 179 ID_LTC2633_H12, 180 ID_LTC2633_L10, 181 ID_LTC2633_H10, 182 ID_LTC2633_L8, 183 ID_LTC2633_H8, 184 ID_LTC2635_L12, 185 ID_LTC2635_H12, 186 ID_LTC2635_L10, 187 ID_LTC2635_H10, 188 ID_LTC2635_L8, 189 ID_LTC2635_H8, 190 }; 191 192 static int ad5064_write(struct ad5064_state *st, unsigned int cmd, 193 unsigned int addr, unsigned int val, unsigned int shift) 194 { 195 val <<= shift; 196 197 return st->write(st, cmd, addr, val); 198 } 199 200 static int ad5064_sync_powerdown_mode(struct ad5064_state *st, 201 const struct iio_chan_spec *chan) 202 { 203 unsigned int val, address; 204 unsigned int shift; 205 int ret; 206 207 if (st->chip_info->regmap_type == AD5064_REGMAP_LTC) { 208 val = 0; 209 address = chan->address; 210 } else { 211 if (st->chip_info->regmap_type == AD5064_REGMAP_ADI2) 212 shift = 4; 213 else 214 shift = 8; 215 216 val = (0x1 << chan->address); 217 address = 0; 218 219 if (st->pwr_down[chan->channel]) 220 val |= st->pwr_down_mode[chan->channel] << shift; 221 } 222 223 ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, address, val, 0); 224 225 return ret; 226 } 227 228 static const char * const ad5064_powerdown_modes[] = { 229 "1kohm_to_gnd", 230 "100kohm_to_gnd", 231 "three_state", 232 }; 233 234 static const char * const ltc2617_powerdown_modes[] = { 235 "90kohm_to_gnd", 236 }; 237 238 static int ad5064_get_powerdown_mode(struct iio_dev *indio_dev, 239 const struct iio_chan_spec *chan) 240 { 241 struct ad5064_state *st = iio_priv(indio_dev); 242 243 return st->pwr_down_mode[chan->channel] - 1; 244 } 245 246 static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev, 247 const struct iio_chan_spec *chan, unsigned int mode) 248 { 249 struct ad5064_state *st = iio_priv(indio_dev); 250 int ret; 251 252 mutex_lock(&st->lock); 253 st->pwr_down_mode[chan->channel] = mode + 1; 254 255 ret = ad5064_sync_powerdown_mode(st, chan); 256 mutex_unlock(&st->lock); 257 258 return ret; 259 } 260 261 static const struct iio_enum ad5064_powerdown_mode_enum = { 262 .items = ad5064_powerdown_modes, 263 .num_items = ARRAY_SIZE(ad5064_powerdown_modes), 264 .get = ad5064_get_powerdown_mode, 265 .set = ad5064_set_powerdown_mode, 266 }; 267 268 static const struct iio_enum ltc2617_powerdown_mode_enum = { 269 .items = ltc2617_powerdown_modes, 270 .num_items = ARRAY_SIZE(ltc2617_powerdown_modes), 271 .get = ad5064_get_powerdown_mode, 272 .set = ad5064_set_powerdown_mode, 273 }; 274 275 static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev, 276 uintptr_t private, const struct iio_chan_spec *chan, char *buf) 277 { 278 struct ad5064_state *st = iio_priv(indio_dev); 279 280 return sysfs_emit(buf, "%d\n", st->pwr_down[chan->channel]); 281 } 282 283 static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev, 284 uintptr_t private, const struct iio_chan_spec *chan, const char *buf, 285 size_t len) 286 { 287 struct ad5064_state *st = iio_priv(indio_dev); 288 bool pwr_down; 289 int ret; 290 291 ret = kstrtobool(buf, &pwr_down); 292 if (ret) 293 return ret; 294 295 mutex_lock(&st->lock); 296 st->pwr_down[chan->channel] = pwr_down; 297 298 ret = ad5064_sync_powerdown_mode(st, chan); 299 mutex_unlock(&st->lock); 300 return ret ? ret : len; 301 } 302 303 static int ad5064_get_vref(struct ad5064_state *st, 304 struct iio_chan_spec const *chan) 305 { 306 unsigned int i; 307 308 if (st->use_internal_vref) 309 return st->chip_info->internal_vref; 310 311 i = st->chip_info->shared_vref ? 0 : chan->channel; 312 return regulator_get_voltage(st->vref_reg[i].consumer); 313 } 314 315 static int ad5064_read_raw(struct iio_dev *indio_dev, 316 struct iio_chan_spec const *chan, 317 int *val, 318 int *val2, 319 long m) 320 { 321 struct ad5064_state *st = iio_priv(indio_dev); 322 int scale_uv; 323 324 switch (m) { 325 case IIO_CHAN_INFO_RAW: 326 *val = st->dac_cache[chan->channel]; 327 return IIO_VAL_INT; 328 case IIO_CHAN_INFO_SCALE: 329 scale_uv = ad5064_get_vref(st, chan); 330 if (scale_uv < 0) 331 return scale_uv; 332 333 *val = scale_uv / 1000; 334 *val2 = chan->scan_type.realbits; 335 return IIO_VAL_FRACTIONAL_LOG2; 336 default: 337 break; 338 } 339 return -EINVAL; 340 } 341 342 static int ad5064_write_raw(struct iio_dev *indio_dev, 343 struct iio_chan_spec const *chan, int val, int val2, long mask) 344 { 345 struct ad5064_state *st = iio_priv(indio_dev); 346 int ret; 347 348 switch (mask) { 349 case IIO_CHAN_INFO_RAW: 350 if (val >= (1 << chan->scan_type.realbits) || val < 0) 351 return -EINVAL; 352 353 mutex_lock(&st->lock); 354 ret = ad5064_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N, 355 chan->address, val, chan->scan_type.shift); 356 if (ret == 0) 357 st->dac_cache[chan->channel] = val; 358 mutex_unlock(&st->lock); 359 break; 360 default: 361 ret = -EINVAL; 362 } 363 364 return ret; 365 } 366 367 static const struct iio_info ad5064_info = { 368 .read_raw = ad5064_read_raw, 369 .write_raw = ad5064_write_raw, 370 }; 371 372 static const struct iio_chan_spec_ext_info ad5064_ext_info[] = { 373 { 374 .name = "powerdown", 375 .read = ad5064_read_dac_powerdown, 376 .write = ad5064_write_dac_powerdown, 377 .shared = IIO_SEPARATE, 378 }, 379 IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5064_powerdown_mode_enum), 380 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5064_powerdown_mode_enum), 381 { }, 382 }; 383 384 static const struct iio_chan_spec_ext_info ltc2617_ext_info[] = { 385 { 386 .name = "powerdown", 387 .read = ad5064_read_dac_powerdown, 388 .write = ad5064_write_dac_powerdown, 389 .shared = IIO_SEPARATE, 390 }, 391 IIO_ENUM("powerdown_mode", IIO_SEPARATE, <c2617_powerdown_mode_enum), 392 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, <c2617_powerdown_mode_enum), 393 { }, 394 }; 395 396 #define AD5064_CHANNEL(chan, addr, bits, _shift, _ext_info) { \ 397 .type = IIO_VOLTAGE, \ 398 .indexed = 1, \ 399 .output = 1, \ 400 .channel = (chan), \ 401 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 402 BIT(IIO_CHAN_INFO_SCALE), \ 403 .address = addr, \ 404 .scan_type = { \ 405 .sign = 'u', \ 406 .realbits = (bits), \ 407 .storagebits = 16, \ 408 .shift = (_shift), \ 409 }, \ 410 .ext_info = (_ext_info), \ 411 } 412 413 #define DECLARE_AD5064_CHANNELS(name, bits, shift, ext_info) \ 414 const struct iio_chan_spec name[] = { \ 415 AD5064_CHANNEL(0, 0, bits, shift, ext_info), \ 416 AD5064_CHANNEL(1, 1, bits, shift, ext_info), \ 417 AD5064_CHANNEL(2, 2, bits, shift, ext_info), \ 418 AD5064_CHANNEL(3, 3, bits, shift, ext_info), \ 419 AD5064_CHANNEL(4, 4, bits, shift, ext_info), \ 420 AD5064_CHANNEL(5, 5, bits, shift, ext_info), \ 421 AD5064_CHANNEL(6, 6, bits, shift, ext_info), \ 422 AD5064_CHANNEL(7, 7, bits, shift, ext_info), \ 423 } 424 425 #define DECLARE_AD5065_CHANNELS(name, bits, shift, ext_info) \ 426 const struct iio_chan_spec name[] = { \ 427 AD5064_CHANNEL(0, 0, bits, shift, ext_info), \ 428 AD5064_CHANNEL(1, 3, bits, shift, ext_info), \ 429 } 430 431 static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8, ad5064_ext_info); 432 static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6, ad5064_ext_info); 433 static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4, ad5064_ext_info); 434 435 static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8, ad5064_ext_info); 436 static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6, ad5064_ext_info); 437 static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4, ad5064_ext_info); 438 439 static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4, ad5064_ext_info); 440 static DECLARE_AD5064_CHANNELS(ad5645_channels, 14, 2, ad5064_ext_info); 441 static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0, ad5064_ext_info); 442 443 static DECLARE_AD5064_CHANNELS(ltc2607_channels, 16, 0, ltc2617_ext_info); 444 static DECLARE_AD5064_CHANNELS(ltc2617_channels, 14, 2, ltc2617_ext_info); 445 static DECLARE_AD5064_CHANNELS(ltc2627_channels, 12, 4, ltc2617_ext_info); 446 #define ltc2631_12_channels ltc2627_channels 447 static DECLARE_AD5064_CHANNELS(ltc2631_10_channels, 10, 6, ltc2617_ext_info); 448 static DECLARE_AD5064_CHANNELS(ltc2631_8_channels, 8, 8, ltc2617_ext_info); 449 450 #define LTC2631_INFO(vref, pchannels, nchannels) \ 451 { \ 452 .shared_vref = true, \ 453 .internal_vref = vref, \ 454 .channels = pchannels, \ 455 .num_channels = nchannels, \ 456 .regmap_type = AD5064_REGMAP_LTC, \ 457 } 458 459 460 static const struct ad5064_chip_info ad5064_chip_info_tbl[] = { 461 [ID_AD5024] = { 462 .shared_vref = false, 463 .channels = ad5024_channels, 464 .num_channels = 4, 465 .regmap_type = AD5064_REGMAP_ADI, 466 }, 467 [ID_AD5025] = { 468 .shared_vref = false, 469 .channels = ad5025_channels, 470 .num_channels = 2, 471 .regmap_type = AD5064_REGMAP_ADI, 472 }, 473 [ID_AD5044] = { 474 .shared_vref = false, 475 .channels = ad5044_channels, 476 .num_channels = 4, 477 .regmap_type = AD5064_REGMAP_ADI, 478 }, 479 [ID_AD5045] = { 480 .shared_vref = false, 481 .channels = ad5045_channels, 482 .num_channels = 2, 483 .regmap_type = AD5064_REGMAP_ADI, 484 }, 485 [ID_AD5064] = { 486 .shared_vref = false, 487 .channels = ad5064_channels, 488 .num_channels = 4, 489 .regmap_type = AD5064_REGMAP_ADI, 490 }, 491 [ID_AD5064_1] = { 492 .shared_vref = true, 493 .channels = ad5064_channels, 494 .num_channels = 4, 495 .regmap_type = AD5064_REGMAP_ADI, 496 }, 497 [ID_AD5065] = { 498 .shared_vref = false, 499 .channels = ad5065_channels, 500 .num_channels = 2, 501 .regmap_type = AD5064_REGMAP_ADI, 502 }, 503 [ID_AD5625] = { 504 .shared_vref = true, 505 .channels = ad5629_channels, 506 .num_channels = 4, 507 .regmap_type = AD5064_REGMAP_ADI2 508 }, 509 [ID_AD5625R_1V25] = { 510 .shared_vref = true, 511 .internal_vref = 1250000, 512 .channels = ad5629_channels, 513 .num_channels = 4, 514 .regmap_type = AD5064_REGMAP_ADI2 515 }, 516 [ID_AD5625R_2V5] = { 517 .shared_vref = true, 518 .internal_vref = 2500000, 519 .channels = ad5629_channels, 520 .num_channels = 4, 521 .regmap_type = AD5064_REGMAP_ADI2 522 }, 523 [ID_AD5627] = { 524 .shared_vref = true, 525 .channels = ad5629_channels, 526 .num_channels = 2, 527 .regmap_type = AD5064_REGMAP_ADI2 528 }, 529 [ID_AD5627R_1V25] = { 530 .shared_vref = true, 531 .internal_vref = 1250000, 532 .channels = ad5629_channels, 533 .num_channels = 2, 534 .regmap_type = AD5064_REGMAP_ADI2 535 }, 536 [ID_AD5627R_2V5] = { 537 .shared_vref = true, 538 .internal_vref = 2500000, 539 .channels = ad5629_channels, 540 .num_channels = 2, 541 .regmap_type = AD5064_REGMAP_ADI2 542 }, 543 [ID_AD5628_1] = { 544 .shared_vref = true, 545 .internal_vref = 2500000, 546 .channels = ad5024_channels, 547 .num_channels = 8, 548 .regmap_type = AD5064_REGMAP_ADI, 549 }, 550 [ID_AD5628_2] = { 551 .shared_vref = true, 552 .internal_vref = 5000000, 553 .channels = ad5024_channels, 554 .num_channels = 8, 555 .regmap_type = AD5064_REGMAP_ADI, 556 }, 557 [ID_AD5629_1] = { 558 .shared_vref = true, 559 .internal_vref = 2500000, 560 .channels = ad5629_channels, 561 .num_channels = 8, 562 .regmap_type = AD5064_REGMAP_ADI, 563 }, 564 [ID_AD5629_2] = { 565 .shared_vref = true, 566 .internal_vref = 5000000, 567 .channels = ad5629_channels, 568 .num_channels = 8, 569 .regmap_type = AD5064_REGMAP_ADI, 570 }, 571 [ID_AD5645R_1V25] = { 572 .shared_vref = true, 573 .internal_vref = 1250000, 574 .channels = ad5645_channels, 575 .num_channels = 4, 576 .regmap_type = AD5064_REGMAP_ADI2 577 }, 578 [ID_AD5645R_2V5] = { 579 .shared_vref = true, 580 .internal_vref = 2500000, 581 .channels = ad5645_channels, 582 .num_channels = 4, 583 .regmap_type = AD5064_REGMAP_ADI2 584 }, 585 [ID_AD5647R_1V25] = { 586 .shared_vref = true, 587 .internal_vref = 1250000, 588 .channels = ad5645_channels, 589 .num_channels = 2, 590 .regmap_type = AD5064_REGMAP_ADI2 591 }, 592 [ID_AD5647R_2V5] = { 593 .shared_vref = true, 594 .internal_vref = 2500000, 595 .channels = ad5645_channels, 596 .num_channels = 2, 597 .regmap_type = AD5064_REGMAP_ADI2 598 }, 599 [ID_AD5648_1] = { 600 .shared_vref = true, 601 .internal_vref = 2500000, 602 .channels = ad5044_channels, 603 .num_channels = 8, 604 .regmap_type = AD5064_REGMAP_ADI, 605 }, 606 [ID_AD5648_2] = { 607 .shared_vref = true, 608 .internal_vref = 5000000, 609 .channels = ad5044_channels, 610 .num_channels = 8, 611 .regmap_type = AD5064_REGMAP_ADI, 612 }, 613 [ID_AD5665] = { 614 .shared_vref = true, 615 .channels = ad5669_channels, 616 .num_channels = 4, 617 .regmap_type = AD5064_REGMAP_ADI2 618 }, 619 [ID_AD5665R_1V25] = { 620 .shared_vref = true, 621 .internal_vref = 1250000, 622 .channels = ad5669_channels, 623 .num_channels = 4, 624 .regmap_type = AD5064_REGMAP_ADI2 625 }, 626 [ID_AD5665R_2V5] = { 627 .shared_vref = true, 628 .internal_vref = 2500000, 629 .channels = ad5669_channels, 630 .num_channels = 4, 631 .regmap_type = AD5064_REGMAP_ADI2 632 }, 633 [ID_AD5666_1] = { 634 .shared_vref = true, 635 .internal_vref = 2500000, 636 .channels = ad5064_channels, 637 .num_channels = 4, 638 .regmap_type = AD5064_REGMAP_ADI, 639 }, 640 [ID_AD5666_2] = { 641 .shared_vref = true, 642 .internal_vref = 5000000, 643 .channels = ad5064_channels, 644 .num_channels = 4, 645 .regmap_type = AD5064_REGMAP_ADI, 646 }, 647 [ID_AD5667] = { 648 .shared_vref = true, 649 .channels = ad5669_channels, 650 .num_channels = 2, 651 .regmap_type = AD5064_REGMAP_ADI2 652 }, 653 [ID_AD5667R_1V25] = { 654 .shared_vref = true, 655 .internal_vref = 1250000, 656 .channels = ad5669_channels, 657 .num_channels = 2, 658 .regmap_type = AD5064_REGMAP_ADI2 659 }, 660 [ID_AD5667R_2V5] = { 661 .shared_vref = true, 662 .internal_vref = 2500000, 663 .channels = ad5669_channels, 664 .num_channels = 2, 665 .regmap_type = AD5064_REGMAP_ADI2 666 }, 667 [ID_AD5668_1] = { 668 .shared_vref = true, 669 .internal_vref = 2500000, 670 .channels = ad5064_channels, 671 .num_channels = 8, 672 .regmap_type = AD5064_REGMAP_ADI, 673 }, 674 [ID_AD5668_2] = { 675 .shared_vref = true, 676 .internal_vref = 5000000, 677 .channels = ad5064_channels, 678 .num_channels = 8, 679 .regmap_type = AD5064_REGMAP_ADI, 680 }, 681 [ID_AD5669_1] = { 682 .shared_vref = true, 683 .internal_vref = 2500000, 684 .channels = ad5669_channels, 685 .num_channels = 8, 686 .regmap_type = AD5064_REGMAP_ADI, 687 }, 688 [ID_AD5669_2] = { 689 .shared_vref = true, 690 .internal_vref = 5000000, 691 .channels = ad5669_channels, 692 .num_channels = 8, 693 .regmap_type = AD5064_REGMAP_ADI, 694 }, 695 [ID_LTC2606] = { 696 .shared_vref = true, 697 .internal_vref = 0, 698 .channels = ltc2607_channels, 699 .num_channels = 1, 700 .regmap_type = AD5064_REGMAP_LTC, 701 }, 702 [ID_LTC2607] = { 703 .shared_vref = true, 704 .internal_vref = 0, 705 .channels = ltc2607_channels, 706 .num_channels = 2, 707 .regmap_type = AD5064_REGMAP_LTC, 708 }, 709 [ID_LTC2609] = { 710 .shared_vref = false, 711 .internal_vref = 0, 712 .channels = ltc2607_channels, 713 .num_channels = 4, 714 .regmap_type = AD5064_REGMAP_LTC, 715 }, 716 [ID_LTC2616] = { 717 .shared_vref = true, 718 .internal_vref = 0, 719 .channels = ltc2617_channels, 720 .num_channels = 1, 721 .regmap_type = AD5064_REGMAP_LTC, 722 }, 723 [ID_LTC2617] = { 724 .shared_vref = true, 725 .internal_vref = 0, 726 .channels = ltc2617_channels, 727 .num_channels = 2, 728 .regmap_type = AD5064_REGMAP_LTC, 729 }, 730 [ID_LTC2619] = { 731 .shared_vref = false, 732 .internal_vref = 0, 733 .channels = ltc2617_channels, 734 .num_channels = 4, 735 .regmap_type = AD5064_REGMAP_LTC, 736 }, 737 [ID_LTC2626] = { 738 .shared_vref = true, 739 .internal_vref = 0, 740 .channels = ltc2627_channels, 741 .num_channels = 1, 742 .regmap_type = AD5064_REGMAP_LTC, 743 }, 744 [ID_LTC2627] = { 745 .shared_vref = true, 746 .internal_vref = 0, 747 .channels = ltc2627_channels, 748 .num_channels = 2, 749 .regmap_type = AD5064_REGMAP_LTC, 750 }, 751 [ID_LTC2629] = { 752 .shared_vref = false, 753 .internal_vref = 0, 754 .channels = ltc2627_channels, 755 .num_channels = 4, 756 .regmap_type = AD5064_REGMAP_LTC, 757 }, 758 [ID_LTC2631_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 1), 759 [ID_LTC2631_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 1), 760 [ID_LTC2631_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 1), 761 [ID_LTC2631_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 1), 762 [ID_LTC2631_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 1), 763 [ID_LTC2631_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 1), 764 [ID_LTC2633_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 2), 765 [ID_LTC2633_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 2), 766 [ID_LTC2633_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 2), 767 [ID_LTC2633_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 2), 768 [ID_LTC2633_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 2), 769 [ID_LTC2633_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 2), 770 [ID_LTC2635_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 4), 771 [ID_LTC2635_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 4), 772 [ID_LTC2635_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 4), 773 [ID_LTC2635_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 4), 774 [ID_LTC2635_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 4), 775 [ID_LTC2635_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 4), 776 }; 777 778 static inline unsigned int ad5064_num_vref(struct ad5064_state *st) 779 { 780 return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels; 781 } 782 783 static const char * const ad5064_vref_names[] = { 784 "vrefA", 785 "vrefB", 786 "vrefC", 787 "vrefD", 788 }; 789 790 static const char *ad5064_vref_name(struct ad5064_state *st, 791 unsigned int vref) 792 { 793 return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref]; 794 } 795 796 static int ad5064_set_config(struct ad5064_state *st, unsigned int val) 797 { 798 unsigned int cmd; 799 800 switch (st->chip_info->regmap_type) { 801 case AD5064_REGMAP_ADI2: 802 cmd = AD5064_CMD_CONFIG_V2; 803 break; 804 default: 805 cmd = AD5064_CMD_CONFIG; 806 break; 807 } 808 809 return ad5064_write(st, cmd, 0, val, 0); 810 } 811 812 static int ad5064_request_vref(struct ad5064_state *st, struct device *dev) 813 { 814 unsigned int i; 815 int ret; 816 817 for (i = 0; i < ad5064_num_vref(st); ++i) 818 st->vref_reg[i].supply = ad5064_vref_name(st, i); 819 820 if (!st->chip_info->internal_vref) 821 return devm_regulator_bulk_get(dev, ad5064_num_vref(st), 822 st->vref_reg); 823 824 /* 825 * This assumes that when the regulator has an internal VREF 826 * there is only one external VREF connection, which is 827 * currently the case for all supported devices. 828 */ 829 st->vref_reg[0].consumer = devm_regulator_get_optional(dev, "vref"); 830 if (!IS_ERR(st->vref_reg[0].consumer)) 831 return 0; 832 833 ret = PTR_ERR(st->vref_reg[0].consumer); 834 if (ret != -ENODEV) 835 return ret; 836 837 /* If no external regulator was supplied use the internal VREF */ 838 st->use_internal_vref = true; 839 ret = ad5064_set_config(st, AD5064_CONFIG_INT_VREF_ENABLE); 840 if (ret) 841 dev_err(dev, "Failed to enable internal vref: %d\n", ret); 842 843 return ret; 844 } 845 846 static void ad5064_bulk_reg_disable(void *data) 847 { 848 struct ad5064_state *st = data; 849 850 regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); 851 } 852 853 static int ad5064_probe(struct device *dev, enum ad5064_type type, 854 const char *name, ad5064_write_func write) 855 { 856 struct iio_dev *indio_dev; 857 struct ad5064_state *st; 858 unsigned int midscale; 859 unsigned int i; 860 int ret; 861 862 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 863 if (indio_dev == NULL) 864 return -ENOMEM; 865 866 st = iio_priv(indio_dev); 867 mutex_init(&st->lock); 868 869 st->chip_info = &ad5064_chip_info_tbl[type]; 870 st->dev = dev; 871 st->write = write; 872 873 ret = ad5064_request_vref(st, dev); 874 if (ret) 875 return ret; 876 877 if (!st->use_internal_vref) { 878 ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg); 879 if (ret) 880 return ret; 881 882 ret = devm_add_action_or_reset(dev, ad5064_bulk_reg_disable, st); 883 if (ret) 884 return ret; 885 } 886 887 indio_dev->name = name; 888 indio_dev->info = &ad5064_info; 889 indio_dev->modes = INDIO_DIRECT_MODE; 890 indio_dev->channels = st->chip_info->channels; 891 indio_dev->num_channels = st->chip_info->num_channels; 892 893 midscale = (1 << indio_dev->channels[0].scan_type.realbits) / 2; 894 895 for (i = 0; i < st->chip_info->num_channels; ++i) { 896 st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K; 897 st->dac_cache[i] = midscale; 898 } 899 900 return devm_iio_device_register(dev, indio_dev); 901 } 902 903 #if IS_ENABLED(CONFIG_SPI_MASTER) 904 905 static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd, 906 unsigned int addr, unsigned int val) 907 { 908 struct spi_device *spi = to_spi_device(st->dev); 909 910 st->data.spi = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val); 911 return spi_write(spi, &st->data.spi, sizeof(st->data.spi)); 912 } 913 914 static int ad5064_spi_probe(struct spi_device *spi) 915 { 916 const struct spi_device_id *id = spi_get_device_id(spi); 917 918 return ad5064_probe(&spi->dev, id->driver_data, id->name, 919 ad5064_spi_write); 920 } 921 922 static const struct spi_device_id ad5064_spi_ids[] = { 923 {"ad5024", ID_AD5024}, 924 {"ad5025", ID_AD5025}, 925 {"ad5044", ID_AD5044}, 926 {"ad5045", ID_AD5045}, 927 {"ad5064", ID_AD5064}, 928 {"ad5064-1", ID_AD5064_1}, 929 {"ad5065", ID_AD5065}, 930 {"ad5628-1", ID_AD5628_1}, 931 {"ad5628-2", ID_AD5628_2}, 932 {"ad5648-1", ID_AD5648_1}, 933 {"ad5648-2", ID_AD5648_2}, 934 {"ad5666-1", ID_AD5666_1}, 935 {"ad5666-2", ID_AD5666_2}, 936 {"ad5668-1", ID_AD5668_1}, 937 {"ad5668-2", ID_AD5668_2}, 938 {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */ 939 {} 940 }; 941 MODULE_DEVICE_TABLE(spi, ad5064_spi_ids); 942 943 static struct spi_driver ad5064_spi_driver = { 944 .driver = { 945 .name = "ad5064", 946 }, 947 .probe = ad5064_spi_probe, 948 .id_table = ad5064_spi_ids, 949 }; 950 951 static int __init ad5064_spi_register_driver(void) 952 { 953 return spi_register_driver(&ad5064_spi_driver); 954 } 955 956 static void ad5064_spi_unregister_driver(void) 957 { 958 spi_unregister_driver(&ad5064_spi_driver); 959 } 960 961 #else 962 963 static inline int ad5064_spi_register_driver(void) { return 0; } 964 static inline void ad5064_spi_unregister_driver(void) { } 965 966 #endif 967 968 #if IS_ENABLED(CONFIG_I2C) 969 970 static int ad5064_i2c_write(struct ad5064_state *st, unsigned int cmd, 971 unsigned int addr, unsigned int val) 972 { 973 struct i2c_client *i2c = to_i2c_client(st->dev); 974 unsigned int cmd_shift; 975 int ret; 976 977 switch (st->chip_info->regmap_type) { 978 case AD5064_REGMAP_ADI2: 979 cmd_shift = 3; 980 break; 981 default: 982 cmd_shift = 4; 983 break; 984 } 985 986 st->data.i2c[0] = (cmd << cmd_shift) | addr; 987 put_unaligned_be16(val, &st->data.i2c[1]); 988 989 ret = i2c_master_send(i2c, st->data.i2c, 3); 990 if (ret < 0) 991 return ret; 992 993 return 0; 994 } 995 996 static int ad5064_i2c_probe(struct i2c_client *i2c) 997 { 998 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 999 return ad5064_probe(&i2c->dev, id->driver_data, id->name, 1000 ad5064_i2c_write); 1001 } 1002 1003 static const struct i2c_device_id ad5064_i2c_ids[] = { 1004 {"ad5625", ID_AD5625 }, 1005 {"ad5625r-1v25", ID_AD5625R_1V25 }, 1006 {"ad5625r-2v5", ID_AD5625R_2V5 }, 1007 {"ad5627", ID_AD5627 }, 1008 {"ad5627r-1v25", ID_AD5627R_1V25 }, 1009 {"ad5627r-2v5", ID_AD5627R_2V5 }, 1010 {"ad5629-1", ID_AD5629_1}, 1011 {"ad5629-2", ID_AD5629_2}, 1012 {"ad5629-3", ID_AD5629_2}, /* similar enough to ad5629-2 */ 1013 {"ad5645r-1v25", ID_AD5645R_1V25 }, 1014 {"ad5645r-2v5", ID_AD5645R_2V5 }, 1015 {"ad5665", ID_AD5665 }, 1016 {"ad5665r-1v25", ID_AD5665R_1V25 }, 1017 {"ad5665r-2v5", ID_AD5665R_2V5 }, 1018 {"ad5667", ID_AD5667 }, 1019 {"ad5667r-1v25", ID_AD5667R_1V25 }, 1020 {"ad5667r-2v5", ID_AD5667R_2V5 }, 1021 {"ad5669-1", ID_AD5669_1}, 1022 {"ad5669-2", ID_AD5669_2}, 1023 {"ad5669-3", ID_AD5669_2}, /* similar enough to ad5669-2 */ 1024 {"ltc2606", ID_LTC2606}, 1025 {"ltc2607", ID_LTC2607}, 1026 {"ltc2609", ID_LTC2609}, 1027 {"ltc2616", ID_LTC2616}, 1028 {"ltc2617", ID_LTC2617}, 1029 {"ltc2619", ID_LTC2619}, 1030 {"ltc2626", ID_LTC2626}, 1031 {"ltc2627", ID_LTC2627}, 1032 {"ltc2629", ID_LTC2629}, 1033 {"ltc2631-l12", ID_LTC2631_L12}, 1034 {"ltc2631-h12", ID_LTC2631_H12}, 1035 {"ltc2631-l10", ID_LTC2631_L10}, 1036 {"ltc2631-h10", ID_LTC2631_H10}, 1037 {"ltc2631-l8", ID_LTC2631_L8}, 1038 {"ltc2631-h8", ID_LTC2631_H8}, 1039 {"ltc2633-l12", ID_LTC2633_L12}, 1040 {"ltc2633-h12", ID_LTC2633_H12}, 1041 {"ltc2633-l10", ID_LTC2633_L10}, 1042 {"ltc2633-h10", ID_LTC2633_H10}, 1043 {"ltc2633-l8", ID_LTC2633_L8}, 1044 {"ltc2633-h8", ID_LTC2633_H8}, 1045 {"ltc2635-l12", ID_LTC2635_L12}, 1046 {"ltc2635-h12", ID_LTC2635_H12}, 1047 {"ltc2635-l10", ID_LTC2635_L10}, 1048 {"ltc2635-h10", ID_LTC2635_H10}, 1049 {"ltc2635-l8", ID_LTC2635_L8}, 1050 {"ltc2635-h8", ID_LTC2635_H8}, 1051 {} 1052 }; 1053 MODULE_DEVICE_TABLE(i2c, ad5064_i2c_ids); 1054 1055 static struct i2c_driver ad5064_i2c_driver = { 1056 .driver = { 1057 .name = "ad5064", 1058 }, 1059 .probe_new = ad5064_i2c_probe, 1060 .id_table = ad5064_i2c_ids, 1061 }; 1062 1063 static int __init ad5064_i2c_register_driver(void) 1064 { 1065 return i2c_add_driver(&ad5064_i2c_driver); 1066 } 1067 1068 static void __exit ad5064_i2c_unregister_driver(void) 1069 { 1070 i2c_del_driver(&ad5064_i2c_driver); 1071 } 1072 1073 #else 1074 1075 static inline int ad5064_i2c_register_driver(void) { return 0; } 1076 static inline void ad5064_i2c_unregister_driver(void) { } 1077 1078 #endif 1079 1080 static int __init ad5064_init(void) 1081 { 1082 int ret; 1083 1084 ret = ad5064_spi_register_driver(); 1085 if (ret) 1086 return ret; 1087 1088 ret = ad5064_i2c_register_driver(); 1089 if (ret) { 1090 ad5064_spi_unregister_driver(); 1091 return ret; 1092 } 1093 1094 return 0; 1095 } 1096 module_init(ad5064_init); 1097 1098 static void __exit ad5064_exit(void) 1099 { 1100 ad5064_i2c_unregister_driver(); 1101 ad5064_spi_unregister_driver(); 1102 } 1103 module_exit(ad5064_exit); 1104 1105 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 1106 MODULE_DESCRIPTION("Analog Devices AD5024 and similar multi-channel DACs"); 1107 MODULE_LICENSE("GPL v2"); 1108