1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AD5446 SPI DAC driver 4 * 5 * Copyright 2010 Analog Devices Inc. 6 */ 7 8 #include <linux/interrupt.h> 9 #include <linux/workqueue.h> 10 #include <linux/device.h> 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/sysfs.h> 14 #include <linux/list.h> 15 #include <linux/spi/spi.h> 16 #include <linux/i2c.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/err.h> 19 #include <linux/module.h> 20 #include <linux/mod_devicetable.h> 21 22 #include <linux/iio/iio.h> 23 #include <linux/iio/sysfs.h> 24 25 #include <asm/unaligned.h> 26 27 #define MODE_PWRDWN_1k 0x1 28 #define MODE_PWRDWN_100k 0x2 29 #define MODE_PWRDWN_TRISTATE 0x3 30 31 /** 32 * struct ad5446_state - driver instance specific data 33 * @dev: this device 34 * @chip_info: chip model specific constants, available modes etc 35 * @reg: supply regulator 36 * @vref_mv: actual reference voltage used 37 * @cached_val: store/retrieve values during power down 38 * @pwr_down_mode: power down mode (1k, 100k or tristate) 39 * @pwr_down: true if the device is in power down 40 * @lock: lock to protect the data buffer during write ops 41 */ 42 43 struct ad5446_state { 44 struct device *dev; 45 const struct ad5446_chip_info *chip_info; 46 struct regulator *reg; 47 unsigned short vref_mv; 48 unsigned cached_val; 49 unsigned pwr_down_mode; 50 unsigned pwr_down; 51 struct mutex lock; 52 }; 53 54 /** 55 * struct ad5446_chip_info - chip specific information 56 * @channel: channel spec for the DAC 57 * @int_vref_mv: AD5620/40/60: the internal reference voltage 58 * @write: chip specific helper function to write to the register 59 */ 60 61 struct ad5446_chip_info { 62 struct iio_chan_spec channel; 63 u16 int_vref_mv; 64 int (*write)(struct ad5446_state *st, unsigned val); 65 }; 66 67 static const char * const ad5446_powerdown_modes[] = { 68 "1kohm_to_gnd", "100kohm_to_gnd", "three_state" 69 }; 70 71 static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev, 72 const struct iio_chan_spec *chan, unsigned int mode) 73 { 74 struct ad5446_state *st = iio_priv(indio_dev); 75 76 st->pwr_down_mode = mode + 1; 77 78 return 0; 79 } 80 81 static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev, 82 const struct iio_chan_spec *chan) 83 { 84 struct ad5446_state *st = iio_priv(indio_dev); 85 86 return st->pwr_down_mode - 1; 87 } 88 89 static const struct iio_enum ad5446_powerdown_mode_enum = { 90 .items = ad5446_powerdown_modes, 91 .num_items = ARRAY_SIZE(ad5446_powerdown_modes), 92 .get = ad5446_get_powerdown_mode, 93 .set = ad5446_set_powerdown_mode, 94 }; 95 96 static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev, 97 uintptr_t private, 98 const struct iio_chan_spec *chan, 99 char *buf) 100 { 101 struct ad5446_state *st = iio_priv(indio_dev); 102 103 return sysfs_emit(buf, "%d\n", st->pwr_down); 104 } 105 106 static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, 107 uintptr_t private, 108 const struct iio_chan_spec *chan, 109 const char *buf, size_t len) 110 { 111 struct ad5446_state *st = iio_priv(indio_dev); 112 unsigned int shift; 113 unsigned int val; 114 bool powerdown; 115 int ret; 116 117 ret = kstrtobool(buf, &powerdown); 118 if (ret) 119 return ret; 120 121 mutex_lock(&st->lock); 122 st->pwr_down = powerdown; 123 124 if (st->pwr_down) { 125 shift = chan->scan_type.realbits + chan->scan_type.shift; 126 val = st->pwr_down_mode << shift; 127 } else { 128 val = st->cached_val; 129 } 130 131 ret = st->chip_info->write(st, val); 132 mutex_unlock(&st->lock); 133 134 return ret ? ret : len; 135 } 136 137 static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = { 138 { 139 .name = "powerdown", 140 .read = ad5446_read_dac_powerdown, 141 .write = ad5446_write_dac_powerdown, 142 .shared = IIO_SEPARATE, 143 }, 144 IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5446_powerdown_mode_enum), 145 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5446_powerdown_mode_enum), 146 { }, 147 }; 148 149 #define _AD5446_CHANNEL(bits, storage, _shift, ext) { \ 150 .type = IIO_VOLTAGE, \ 151 .indexed = 1, \ 152 .output = 1, \ 153 .channel = 0, \ 154 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 155 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 156 .scan_type = { \ 157 .sign = 'u', \ 158 .realbits = (bits), \ 159 .storagebits = (storage), \ 160 .shift = (_shift), \ 161 }, \ 162 .ext_info = (ext), \ 163 } 164 165 #define AD5446_CHANNEL(bits, storage, shift) \ 166 _AD5446_CHANNEL(bits, storage, shift, NULL) 167 168 #define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \ 169 _AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown) 170 171 static int ad5446_read_raw(struct iio_dev *indio_dev, 172 struct iio_chan_spec const *chan, 173 int *val, 174 int *val2, 175 long m) 176 { 177 struct ad5446_state *st = iio_priv(indio_dev); 178 179 switch (m) { 180 case IIO_CHAN_INFO_RAW: 181 *val = st->cached_val >> chan->scan_type.shift; 182 return IIO_VAL_INT; 183 case IIO_CHAN_INFO_SCALE: 184 *val = st->vref_mv; 185 *val2 = chan->scan_type.realbits; 186 return IIO_VAL_FRACTIONAL_LOG2; 187 } 188 return -EINVAL; 189 } 190 191 static int ad5446_write_raw(struct iio_dev *indio_dev, 192 struct iio_chan_spec const *chan, 193 int val, 194 int val2, 195 long mask) 196 { 197 struct ad5446_state *st = iio_priv(indio_dev); 198 int ret = 0; 199 200 switch (mask) { 201 case IIO_CHAN_INFO_RAW: 202 if (val >= (1 << chan->scan_type.realbits) || val < 0) 203 return -EINVAL; 204 205 val <<= chan->scan_type.shift; 206 mutex_lock(&st->lock); 207 st->cached_val = val; 208 if (!st->pwr_down) 209 ret = st->chip_info->write(st, val); 210 mutex_unlock(&st->lock); 211 break; 212 default: 213 ret = -EINVAL; 214 } 215 216 return ret; 217 } 218 219 static const struct iio_info ad5446_info = { 220 .read_raw = ad5446_read_raw, 221 .write_raw = ad5446_write_raw, 222 }; 223 224 static int ad5446_probe(struct device *dev, const char *name, 225 const struct ad5446_chip_info *chip_info) 226 { 227 struct ad5446_state *st; 228 struct iio_dev *indio_dev; 229 struct regulator *reg; 230 int ret, voltage_uv = 0; 231 232 reg = devm_regulator_get(dev, "vcc"); 233 if (!IS_ERR(reg)) { 234 ret = regulator_enable(reg); 235 if (ret) 236 return ret; 237 238 ret = regulator_get_voltage(reg); 239 if (ret < 0) 240 goto error_disable_reg; 241 242 voltage_uv = ret; 243 } 244 245 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 246 if (indio_dev == NULL) { 247 ret = -ENOMEM; 248 goto error_disable_reg; 249 } 250 st = iio_priv(indio_dev); 251 st->chip_info = chip_info; 252 253 dev_set_drvdata(dev, indio_dev); 254 st->reg = reg; 255 st->dev = dev; 256 257 indio_dev->name = name; 258 indio_dev->info = &ad5446_info; 259 indio_dev->modes = INDIO_DIRECT_MODE; 260 indio_dev->channels = &st->chip_info->channel; 261 indio_dev->num_channels = 1; 262 263 mutex_init(&st->lock); 264 265 st->pwr_down_mode = MODE_PWRDWN_1k; 266 267 if (st->chip_info->int_vref_mv) 268 st->vref_mv = st->chip_info->int_vref_mv; 269 else if (voltage_uv) 270 st->vref_mv = voltage_uv / 1000; 271 else 272 dev_warn(dev, "reference voltage unspecified\n"); 273 274 ret = iio_device_register(indio_dev); 275 if (ret) 276 goto error_disable_reg; 277 278 return 0; 279 280 error_disable_reg: 281 if (!IS_ERR(reg)) 282 regulator_disable(reg); 283 return ret; 284 } 285 286 static void ad5446_remove(struct device *dev) 287 { 288 struct iio_dev *indio_dev = dev_get_drvdata(dev); 289 struct ad5446_state *st = iio_priv(indio_dev); 290 291 iio_device_unregister(indio_dev); 292 if (!IS_ERR(st->reg)) 293 regulator_disable(st->reg); 294 } 295 296 #if IS_ENABLED(CONFIG_SPI_MASTER) 297 298 static int ad5446_write(struct ad5446_state *st, unsigned val) 299 { 300 struct spi_device *spi = to_spi_device(st->dev); 301 __be16 data = cpu_to_be16(val); 302 303 return spi_write(spi, &data, sizeof(data)); 304 } 305 306 static int ad5660_write(struct ad5446_state *st, unsigned val) 307 { 308 struct spi_device *spi = to_spi_device(st->dev); 309 uint8_t data[3]; 310 311 put_unaligned_be24(val, &data[0]); 312 313 return spi_write(spi, data, sizeof(data)); 314 } 315 316 /* 317 * ad5446_supported_spi_device_ids: 318 * The AD5620/40/60 parts are available in different fixed internal reference 319 * voltage options. The actual part numbers may look differently 320 * (and a bit cryptic), however this style is used to make clear which 321 * parts are supported here. 322 */ 323 enum ad5446_supported_spi_device_ids { 324 ID_AD5300, 325 ID_AD5310, 326 ID_AD5320, 327 ID_AD5444, 328 ID_AD5446, 329 ID_AD5450, 330 ID_AD5451, 331 ID_AD5541A, 332 ID_AD5512A, 333 ID_AD5553, 334 ID_AD5600, 335 ID_AD5601, 336 ID_AD5611, 337 ID_AD5621, 338 ID_AD5641, 339 ID_AD5620_2500, 340 ID_AD5620_1250, 341 ID_AD5640_2500, 342 ID_AD5640_1250, 343 ID_AD5660_2500, 344 ID_AD5660_1250, 345 ID_AD5662, 346 }; 347 348 static const struct ad5446_chip_info ad5446_spi_chip_info[] = { 349 [ID_AD5300] = { 350 .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), 351 .write = ad5446_write, 352 }, 353 [ID_AD5310] = { 354 .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), 355 .write = ad5446_write, 356 }, 357 [ID_AD5320] = { 358 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), 359 .write = ad5446_write, 360 }, 361 [ID_AD5444] = { 362 .channel = AD5446_CHANNEL(12, 16, 2), 363 .write = ad5446_write, 364 }, 365 [ID_AD5446] = { 366 .channel = AD5446_CHANNEL(14, 16, 0), 367 .write = ad5446_write, 368 }, 369 [ID_AD5450] = { 370 .channel = AD5446_CHANNEL(8, 16, 6), 371 .write = ad5446_write, 372 }, 373 [ID_AD5451] = { 374 .channel = AD5446_CHANNEL(10, 16, 4), 375 .write = ad5446_write, 376 }, 377 [ID_AD5541A] = { 378 .channel = AD5446_CHANNEL(16, 16, 0), 379 .write = ad5446_write, 380 }, 381 [ID_AD5512A] = { 382 .channel = AD5446_CHANNEL(12, 16, 4), 383 .write = ad5446_write, 384 }, 385 [ID_AD5553] = { 386 .channel = AD5446_CHANNEL(14, 16, 0), 387 .write = ad5446_write, 388 }, 389 [ID_AD5600] = { 390 .channel = AD5446_CHANNEL(16, 16, 0), 391 .write = ad5446_write, 392 }, 393 [ID_AD5601] = { 394 .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6), 395 .write = ad5446_write, 396 }, 397 [ID_AD5611] = { 398 .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4), 399 .write = ad5446_write, 400 }, 401 [ID_AD5621] = { 402 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), 403 .write = ad5446_write, 404 }, 405 [ID_AD5641] = { 406 .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), 407 .write = ad5446_write, 408 }, 409 [ID_AD5620_2500] = { 410 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), 411 .int_vref_mv = 2500, 412 .write = ad5446_write, 413 }, 414 [ID_AD5620_1250] = { 415 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), 416 .int_vref_mv = 1250, 417 .write = ad5446_write, 418 }, 419 [ID_AD5640_2500] = { 420 .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), 421 .int_vref_mv = 2500, 422 .write = ad5446_write, 423 }, 424 [ID_AD5640_1250] = { 425 .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), 426 .int_vref_mv = 1250, 427 .write = ad5446_write, 428 }, 429 [ID_AD5660_2500] = { 430 .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), 431 .int_vref_mv = 2500, 432 .write = ad5660_write, 433 }, 434 [ID_AD5660_1250] = { 435 .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), 436 .int_vref_mv = 1250, 437 .write = ad5660_write, 438 }, 439 [ID_AD5662] = { 440 .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), 441 .write = ad5660_write, 442 }, 443 }; 444 445 static const struct spi_device_id ad5446_spi_ids[] = { 446 {"ad5300", ID_AD5300}, 447 {"ad5310", ID_AD5310}, 448 {"ad5320", ID_AD5320}, 449 {"ad5444", ID_AD5444}, 450 {"ad5446", ID_AD5446}, 451 {"ad5450", ID_AD5450}, 452 {"ad5451", ID_AD5451}, 453 {"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */ 454 {"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */ 455 {"ad5512a", ID_AD5512A}, 456 {"ad5541a", ID_AD5541A}, 457 {"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */ 458 {"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */ 459 {"ad5553", ID_AD5553}, 460 {"ad5600", ID_AD5600}, 461 {"ad5601", ID_AD5601}, 462 {"ad5611", ID_AD5611}, 463 {"ad5621", ID_AD5621}, 464 {"ad5641", ID_AD5641}, 465 {"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */ 466 {"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */ 467 {"ad5640-2500", ID_AD5640_2500}, 468 {"ad5640-1250", ID_AD5640_1250}, 469 {"ad5660-2500", ID_AD5660_2500}, 470 {"ad5660-1250", ID_AD5660_1250}, 471 {"ad5662", ID_AD5662}, 472 {"dac081s101", ID_AD5300}, /* compatible Texas Instruments chips */ 473 {"dac101s101", ID_AD5310}, 474 {"dac121s101", ID_AD5320}, 475 {"dac7512", ID_AD5320}, 476 {} 477 }; 478 MODULE_DEVICE_TABLE(spi, ad5446_spi_ids); 479 480 static const struct of_device_id ad5446_of_ids[] = { 481 { .compatible = "ti,dac7512" }, 482 { } 483 }; 484 MODULE_DEVICE_TABLE(of, ad5446_of_ids); 485 486 static int ad5446_spi_probe(struct spi_device *spi) 487 { 488 const struct spi_device_id *id = spi_get_device_id(spi); 489 490 return ad5446_probe(&spi->dev, id->name, 491 &ad5446_spi_chip_info[id->driver_data]); 492 } 493 494 static void ad5446_spi_remove(struct spi_device *spi) 495 { 496 ad5446_remove(&spi->dev); 497 } 498 499 static struct spi_driver ad5446_spi_driver = { 500 .driver = { 501 .name = "ad5446", 502 .of_match_table = ad5446_of_ids, 503 }, 504 .probe = ad5446_spi_probe, 505 .remove = ad5446_spi_remove, 506 .id_table = ad5446_spi_ids, 507 }; 508 509 static int __init ad5446_spi_register_driver(void) 510 { 511 return spi_register_driver(&ad5446_spi_driver); 512 } 513 514 static void ad5446_spi_unregister_driver(void) 515 { 516 spi_unregister_driver(&ad5446_spi_driver); 517 } 518 519 #else 520 521 static inline int ad5446_spi_register_driver(void) { return 0; } 522 static inline void ad5446_spi_unregister_driver(void) { } 523 524 #endif 525 526 #if IS_ENABLED(CONFIG_I2C) 527 528 static int ad5622_write(struct ad5446_state *st, unsigned val) 529 { 530 struct i2c_client *client = to_i2c_client(st->dev); 531 __be16 data = cpu_to_be16(val); 532 int ret; 533 534 ret = i2c_master_send(client, (char *)&data, sizeof(data)); 535 if (ret < 0) 536 return ret; 537 if (ret != sizeof(data)) 538 return -EIO; 539 540 return 0; 541 } 542 543 /* 544 * ad5446_supported_i2c_device_ids: 545 * The AD5620/40/60 parts are available in different fixed internal reference 546 * voltage options. The actual part numbers may look differently 547 * (and a bit cryptic), however this style is used to make clear which 548 * parts are supported here. 549 */ 550 enum ad5446_supported_i2c_device_ids { 551 ID_AD5602, 552 ID_AD5612, 553 ID_AD5622, 554 }; 555 556 static const struct ad5446_chip_info ad5446_i2c_chip_info[] = { 557 [ID_AD5602] = { 558 .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), 559 .write = ad5622_write, 560 }, 561 [ID_AD5612] = { 562 .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), 563 .write = ad5622_write, 564 }, 565 [ID_AD5622] = { 566 .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), 567 .write = ad5622_write, 568 }, 569 }; 570 571 static int ad5446_i2c_probe(struct i2c_client *i2c) 572 { 573 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 574 return ad5446_probe(&i2c->dev, id->name, 575 &ad5446_i2c_chip_info[id->driver_data]); 576 } 577 578 static void ad5446_i2c_remove(struct i2c_client *i2c) 579 { 580 ad5446_remove(&i2c->dev); 581 } 582 583 static const struct i2c_device_id ad5446_i2c_ids[] = { 584 {"ad5301", ID_AD5602}, 585 {"ad5311", ID_AD5612}, 586 {"ad5321", ID_AD5622}, 587 {"ad5602", ID_AD5602}, 588 {"ad5612", ID_AD5612}, 589 {"ad5622", ID_AD5622}, 590 {} 591 }; 592 MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids); 593 594 static struct i2c_driver ad5446_i2c_driver = { 595 .driver = { 596 .name = "ad5446", 597 }, 598 .probe = ad5446_i2c_probe, 599 .remove = ad5446_i2c_remove, 600 .id_table = ad5446_i2c_ids, 601 }; 602 603 static int __init ad5446_i2c_register_driver(void) 604 { 605 return i2c_add_driver(&ad5446_i2c_driver); 606 } 607 608 static void __exit ad5446_i2c_unregister_driver(void) 609 { 610 i2c_del_driver(&ad5446_i2c_driver); 611 } 612 613 #else 614 615 static inline int ad5446_i2c_register_driver(void) { return 0; } 616 static inline void ad5446_i2c_unregister_driver(void) { } 617 618 #endif 619 620 static int __init ad5446_init(void) 621 { 622 int ret; 623 624 ret = ad5446_spi_register_driver(); 625 if (ret) 626 return ret; 627 628 ret = ad5446_i2c_register_driver(); 629 if (ret) { 630 ad5446_spi_unregister_driver(); 631 return ret; 632 } 633 634 return 0; 635 } 636 module_init(ad5446_init); 637 638 static void __exit ad5446_exit(void) 639 { 640 ad5446_i2c_unregister_driver(); 641 ad5446_spi_unregister_driver(); 642 } 643 module_exit(ad5446_exit); 644 645 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); 646 MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC"); 647 MODULE_LICENSE("GPL v2"); 648