1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Texas Instruments ADS1119 ADC driver. 4 * 5 * Copyright 2024 Toradex 6 */ 7 8 #include <linux/bits.h> 9 #include <linux/bitfield.h> 10 #include <linux/completion.h> 11 #include <linux/delay.h> 12 #include <linux/dev_printk.h> 13 #include <linux/err.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/interrupt.h> 16 #include <linux/iopoll.h> 17 #include <linux/i2c.h> 18 #include <linux/kernel.h> 19 #include <linux/math.h> 20 #include <linux/module.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/regulator/consumer.h> 23 #include <linux/units.h> 24 25 #include <linux/iio/iio.h> 26 #include <linux/iio/buffer.h> 27 #include <linux/iio/trigger.h> 28 #include <linux/iio/triggered_buffer.h> 29 #include <linux/iio/trigger_consumer.h> 30 31 #define ADS1119_CMD_RESET 0x06 32 #define ADS1119_CMD_POWERDOWN 0x02 33 #define ADS1119_CMD_START_SYNC 0x08 34 #define ADS1119_CMD_RDATA 0x10 35 #define ADS1119_CMD_RREG_CONFIG 0x20 36 #define ADS1119_CMD_RREG_STATUS 0x24 37 #define ADS1119_CMD_WREG 0x40 38 39 #define ADS1119_CMD_RREG(reg) (0x20 | (reg) << 2) 40 41 /* Config register */ 42 #define ADS1119_REG_CONFIG 0x00 43 #define ADS1119_CONFIG_VREF_FIELD BIT(0) 44 #define ADS1119_CONFIG_CM_FIELD BIT(1) 45 #define ADS1119_CONFIG_DR_FIELD GENMASK(3, 2) 46 #define ADS1119_CONFIG_GAIN_FIELD BIT(4) 47 #define ADS1119_CONFIG_MUX_FIELD GENMASK(7, 5) 48 49 #define ADS1119_VREF_INTERNAL 0 50 #define ADS1119_VREF_EXTERNAL 1 51 #define ADS1119_VREF_INTERNAL_VAL 2048000 52 53 #define ADS1119_CM_SINGLE 0 54 #define ADS1119_CM_CONTINUOUS 1 55 56 #define ADS1119_DR_20_SPS 0 57 #define ADS1119_DR_90_SPS 1 58 #define ADS1119_DR_330_SPS 2 59 #define ADS1119_DR_1000_SPS 3 60 61 #define ADS1119_GAIN_1 0 62 #define ADS1119_GAIN_4 1 63 64 #define ADS1119_MUX_AIN0_AIN1 0 65 #define ADS1119_MUX_AIN2_AIN3 1 66 #define ADS1119_MUX_AIN1_AIN2 2 67 #define ADS1119_MUX_AIN0 3 68 #define ADS1119_MUX_AIN1 4 69 #define ADS1119_MUX_AIN2 5 70 #define ADS1119_MUX_AIN3 6 71 #define ADS1119_MUX_SHORTED 7 72 73 /* Status register */ 74 #define ADS1119_REG_STATUS 0x01 75 #define ADS1119_STATUS_DRDY_FIELD BIT(7) 76 77 #define ADS1119_DEFAULT_GAIN 1 78 #define ADS1119_DEFAULT_DATARATE 20 79 80 #define ADS1119_SUSPEND_DELAY 2000 81 82 /* Timeout based on the minimum sample rate of 20 SPS (50000us) */ 83 #define ADS1119_MAX_DRDY_TIMEOUT 85000 84 85 #define ADS1119_MAX_CHANNELS 7 86 #define ADS1119_MAX_SINGLE_CHANNELS 4 87 88 struct ads1119_channel_config { 89 int gain; 90 int datarate; 91 int mux; 92 }; 93 94 struct ads1119_state { 95 struct completion completion; 96 struct i2c_client *client; 97 struct gpio_desc *reset_gpio; 98 struct iio_trigger *trig; 99 struct ads1119_channel_config *channels_cfg; 100 unsigned int num_channels_cfg; 101 unsigned int cached_config; 102 int vref_uV; 103 }; 104 105 static const char * const ads1119_power_supplies[] = { 106 "avdd", "dvdd" 107 }; 108 109 static const int ads1119_available_datarates[] = { 110 20, 90, 330, 1000, 111 }; 112 113 static const int ads1119_available_gains[] = { 114 1, 1, 115 1, 4, 116 }; 117 118 static int ads1119_upd_cfg_reg(struct ads1119_state *st, unsigned int fields, 119 unsigned int val) 120 { 121 unsigned int config = st->cached_config; 122 int ret; 123 124 config &= ~fields; 125 config |= val; 126 127 ret = i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG, config); 128 if (ret) 129 return ret; 130 131 st->cached_config = config; 132 133 return 0; 134 } 135 136 static bool ads1119_data_ready(struct ads1119_state *st) 137 { 138 int status; 139 140 status = i2c_smbus_read_byte_data(st->client, ADS1119_CMD_RREG_STATUS); 141 if (status < 0) 142 return false; 143 144 return FIELD_GET(ADS1119_STATUS_DRDY_FIELD, status); 145 } 146 147 static int ads1119_reset(struct ads1119_state *st) 148 { 149 st->cached_config = 0; 150 151 if (!st->reset_gpio) 152 return i2c_smbus_write_byte(st->client, ADS1119_CMD_RESET); 153 154 gpiod_set_value_cansleep(st->reset_gpio, 1); 155 udelay(1); 156 gpiod_set_value_cansleep(st->reset_gpio, 0); 157 udelay(1); 158 159 return 0; 160 } 161 162 static int ads1119_set_conv_mode(struct ads1119_state *st, bool continuous) 163 { 164 unsigned int mode; 165 166 if (continuous) 167 mode = ADS1119_CM_CONTINUOUS; 168 else 169 mode = ADS1119_CM_SINGLE; 170 171 return ads1119_upd_cfg_reg(st, ADS1119_CONFIG_CM_FIELD, 172 FIELD_PREP(ADS1119_CONFIG_CM_FIELD, mode)); 173 } 174 175 static int ads1119_get_hw_gain(int gain) 176 { 177 if (gain == 4) 178 return ADS1119_GAIN_4; 179 else 180 return ADS1119_GAIN_1; 181 } 182 183 static int ads1119_get_hw_datarate(int datarate) 184 { 185 switch (datarate) { 186 case 90: 187 return ADS1119_DR_90_SPS; 188 case 330: 189 return ADS1119_DR_330_SPS; 190 case 1000: 191 return ADS1119_DR_1000_SPS; 192 case 20: 193 default: 194 return ADS1119_DR_20_SPS; 195 } 196 } 197 198 static int ads1119_configure_channel(struct ads1119_state *st, int mux, 199 int gain, int datarate) 200 { 201 int ret; 202 203 ret = ads1119_upd_cfg_reg(st, ADS1119_CONFIG_MUX_FIELD, 204 FIELD_PREP(ADS1119_CONFIG_MUX_FIELD, mux)); 205 if (ret) 206 return ret; 207 208 ret = ads1119_upd_cfg_reg(st, ADS1119_CONFIG_GAIN_FIELD, 209 FIELD_PREP(ADS1119_CONFIG_GAIN_FIELD, 210 ads1119_get_hw_gain(gain))); 211 if (ret) 212 return ret; 213 214 return ads1119_upd_cfg_reg(st, ADS1119_CONFIG_DR_FIELD, 215 FIELD_PREP(ADS1119_CONFIG_DR_FIELD, 216 ads1119_get_hw_datarate(datarate))); 217 } 218 219 static int ads1119_poll_data_ready(struct ads1119_state *st, 220 struct iio_chan_spec const *chan) 221 { 222 unsigned int datarate = st->channels_cfg[chan->address].datarate; 223 unsigned long wait_time; 224 bool data_ready; 225 226 /* Poll 5 times more than the data rate */ 227 wait_time = DIV_ROUND_CLOSEST(MICRO, 5 * datarate); 228 229 return read_poll_timeout(ads1119_data_ready, data_ready, 230 data_ready, wait_time, 231 ADS1119_MAX_DRDY_TIMEOUT, false, st); 232 } 233 234 static int ads1119_read_data(struct ads1119_state *st, 235 struct iio_chan_spec const *chan, 236 unsigned int *val) 237 { 238 unsigned int timeout; 239 int ret = 0; 240 241 timeout = msecs_to_jiffies(ADS1119_MAX_DRDY_TIMEOUT); 242 243 if (!st->client->irq) { 244 ret = ads1119_poll_data_ready(st, chan); 245 if (ret) 246 return ret; 247 } else if (!wait_for_completion_timeout(&st->completion, timeout)) { 248 return -ETIMEDOUT; 249 } 250 251 ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA); 252 if (ret < 0) 253 return ret; 254 255 *val = ret; 256 257 return 0; 258 } 259 260 static int ads1119_single_conversion(struct ads1119_state *st, 261 struct iio_chan_spec const *chan, 262 int *val, 263 bool calib_offset) 264 { 265 struct device *dev = &st->client->dev; 266 int mux = st->channels_cfg[chan->address].mux; 267 int gain = st->channels_cfg[chan->address].gain; 268 int datarate = st->channels_cfg[chan->address].datarate; 269 unsigned int sample; 270 int ret; 271 272 if (calib_offset) 273 mux = ADS1119_MUX_SHORTED; 274 275 ret = pm_runtime_resume_and_get(dev); 276 if (ret) 277 return ret; 278 279 ret = ads1119_configure_channel(st, mux, gain, datarate); 280 if (ret) 281 goto pdown; 282 283 if (st->client->irq) 284 reinit_completion(&st->completion); 285 286 ret = i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC); 287 if (ret) 288 goto pdown; 289 290 ret = ads1119_read_data(st, chan, &sample); 291 if (ret) 292 goto pdown; 293 294 *val = sign_extend32(sample, chan->scan_type.realbits - 1); 295 ret = IIO_VAL_INT; 296 pdown: 297 pm_runtime_put_autosuspend(dev); 298 return ret; 299 } 300 301 static int ads1119_validate_datarate(struct ads1119_state *st, int datarate) 302 { 303 switch (datarate) { 304 case 20: 305 case 90: 306 case 330: 307 case 1000: 308 return datarate; 309 default: 310 return -EINVAL; 311 } 312 } 313 314 static int ads1119_read_avail(struct iio_dev *indio_dev, 315 struct iio_chan_spec const *chan, 316 const int **vals, int *type, int *length, 317 long mask) 318 { 319 switch (mask) { 320 case IIO_CHAN_INFO_SCALE: 321 *type = IIO_VAL_FRACTIONAL; 322 *vals = ads1119_available_gains; 323 *length = ARRAY_SIZE(ads1119_available_gains); 324 return IIO_AVAIL_LIST; 325 case IIO_CHAN_INFO_SAMP_FREQ: 326 *type = IIO_VAL_INT; 327 *vals = ads1119_available_datarates; 328 *length = ARRAY_SIZE(ads1119_available_datarates); 329 return IIO_AVAIL_LIST; 330 default: 331 return -EINVAL; 332 } 333 } 334 335 static int ads1119_read_raw(struct iio_dev *indio_dev, 336 struct iio_chan_spec const *chan, int *val, 337 int *val2, long mask) 338 { 339 struct ads1119_state *st = iio_priv(indio_dev); 340 unsigned int index = chan->address; 341 int ret; 342 343 if (index >= st->num_channels_cfg) 344 return -EINVAL; 345 346 switch (mask) { 347 case IIO_CHAN_INFO_RAW: 348 if (!iio_device_claim_direct(indio_dev)) 349 return -EBUSY; 350 ret = ads1119_single_conversion(st, chan, val, false); 351 iio_device_release_direct(indio_dev); 352 return ret; 353 case IIO_CHAN_INFO_OFFSET: 354 if (!iio_device_claim_direct(indio_dev)) 355 return -EBUSY; 356 ret = ads1119_single_conversion(st, chan, val, true); 357 iio_device_release_direct(indio_dev); 358 return ret; 359 case IIO_CHAN_INFO_SCALE: 360 *val = st->vref_uV / 1000; 361 *val /= st->channels_cfg[index].gain; 362 *val2 = chan->scan_type.realbits - 1; 363 return IIO_VAL_FRACTIONAL_LOG2; 364 case IIO_CHAN_INFO_SAMP_FREQ: 365 *val = st->channels_cfg[index].datarate; 366 return IIO_VAL_INT; 367 default: 368 return -EINVAL; 369 } 370 } 371 372 static int ads1119_write_raw(struct iio_dev *indio_dev, 373 struct iio_chan_spec const *chan, int val, 374 int val2, long mask) 375 { 376 struct ads1119_state *st = iio_priv(indio_dev); 377 unsigned int index = chan->address; 378 int ret; 379 380 if (index >= st->num_channels_cfg) 381 return -EINVAL; 382 383 switch (mask) { 384 case IIO_CHAN_INFO_SCALE: 385 ret = MICRO / ((val * MICRO) + val2); 386 if (ret != 1 && ret != 4) 387 return -EINVAL; 388 389 st->channels_cfg[index].gain = ret; 390 return 0; 391 case IIO_CHAN_INFO_SAMP_FREQ: 392 ret = ads1119_validate_datarate(st, val); 393 if (ret < 0) 394 return ret; 395 396 st->channels_cfg[index].datarate = ret; 397 return 0; 398 default: 399 return -EINVAL; 400 } 401 } 402 403 static int ads1119_debugfs_reg_access(struct iio_dev *indio_dev, 404 unsigned int reg, unsigned int writeval, 405 unsigned int *readval) 406 { 407 struct ads1119_state *st = iio_priv(indio_dev); 408 int ret; 409 410 if (reg > ADS1119_REG_STATUS) 411 return -EINVAL; 412 413 if (readval) { 414 ret = i2c_smbus_read_byte_data(st->client, 415 ADS1119_CMD_RREG(reg)); 416 if (ret < 0) 417 return ret; 418 419 *readval = ret; 420 return 0; 421 } 422 423 if (reg > ADS1119_REG_CONFIG) 424 return -EINVAL; 425 426 return i2c_smbus_write_byte_data(st->client, ADS1119_CMD_WREG, 427 writeval); 428 } 429 430 static const struct iio_info ads1119_info = { 431 .read_avail = ads1119_read_avail, 432 .read_raw = ads1119_read_raw, 433 .write_raw = ads1119_write_raw, 434 .debugfs_reg_access = ads1119_debugfs_reg_access, 435 }; 436 437 static int ads1119_triggered_buffer_preenable(struct iio_dev *indio_dev) 438 { 439 struct ads1119_state *st = iio_priv(indio_dev); 440 struct device *dev = &st->client->dev; 441 unsigned int index; 442 int ret; 443 444 index = find_first_bit(indio_dev->active_scan_mask, 445 iio_get_masklength(indio_dev)); 446 447 ret = ads1119_set_conv_mode(st, true); 448 if (ret) 449 return ret; 450 451 ret = ads1119_configure_channel(st, 452 st->channels_cfg[index].mux, 453 st->channels_cfg[index].gain, 454 st->channels_cfg[index].datarate); 455 if (ret) 456 return ret; 457 458 ret = pm_runtime_resume_and_get(dev); 459 if (ret) 460 return ret; 461 462 return i2c_smbus_write_byte(st->client, ADS1119_CMD_START_SYNC); 463 } 464 465 static int ads1119_triggered_buffer_postdisable(struct iio_dev *indio_dev) 466 { 467 struct ads1119_state *st = iio_priv(indio_dev); 468 struct device *dev = &st->client->dev; 469 int ret; 470 471 ret = ads1119_set_conv_mode(st, false); 472 if (ret) 473 return ret; 474 475 pm_runtime_put_autosuspend(dev); 476 477 return 0; 478 } 479 480 static const struct iio_buffer_setup_ops ads1119_buffer_setup_ops = { 481 .preenable = ads1119_triggered_buffer_preenable, 482 .postdisable = ads1119_triggered_buffer_postdisable, 483 .validate_scan_mask = &iio_validate_scan_mask_onehot, 484 }; 485 486 static const struct iio_trigger_ops ads1119_trigger_ops = { 487 .validate_device = &iio_trigger_validate_own_device, 488 }; 489 490 static irqreturn_t ads1119_irq_handler(int irq, void *dev_id) 491 { 492 struct iio_dev *indio_dev = dev_id; 493 struct ads1119_state *st = iio_priv(indio_dev); 494 495 if (iio_buffer_enabled(indio_dev) && iio_trigger_using_own(indio_dev)) 496 iio_trigger_poll(indio_dev->trig); 497 else 498 complete(&st->completion); 499 500 return IRQ_HANDLED; 501 } 502 503 static irqreturn_t ads1119_trigger_handler(int irq, void *private) 504 { 505 struct iio_poll_func *pf = private; 506 struct iio_dev *indio_dev = pf->indio_dev; 507 struct ads1119_state *st = iio_priv(indio_dev); 508 struct { 509 s16 sample; 510 aligned_s64 timestamp; 511 } scan = { }; 512 unsigned int index; 513 int ret; 514 515 if (!iio_trigger_using_own(indio_dev)) { 516 index = find_first_bit(indio_dev->active_scan_mask, 517 iio_get_masklength(indio_dev)); 518 519 ret = ads1119_poll_data_ready(st, &indio_dev->channels[index]); 520 if (ret) { 521 dev_err(&st->client->dev, 522 "Failed to poll data on trigger (%d)\n", ret); 523 goto done; 524 } 525 } 526 527 ret = i2c_smbus_read_word_swapped(st->client, ADS1119_CMD_RDATA); 528 if (ret < 0) { 529 dev_err(&st->client->dev, 530 "Failed to read data on trigger (%d)\n", ret); 531 goto done; 532 } 533 534 scan.sample = ret; 535 536 iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan), 537 iio_get_time_ns(indio_dev)); 538 done: 539 iio_trigger_notify_done(indio_dev->trig); 540 return IRQ_HANDLED; 541 } 542 543 static int ads1119_init(struct ads1119_state *st, bool vref_external) 544 { 545 int ret; 546 547 ret = ads1119_reset(st); 548 if (ret) 549 return ret; 550 551 if (vref_external) 552 return ads1119_upd_cfg_reg(st, 553 ADS1119_CONFIG_VREF_FIELD, 554 FIELD_PREP(ADS1119_CONFIG_VREF_FIELD, 555 ADS1119_VREF_EXTERNAL)); 556 return 0; 557 } 558 559 static int ads1119_map_analog_inputs_mux(int ain_pos, int ain_neg, 560 bool differential) 561 { 562 if (ain_pos >= ADS1119_MAX_SINGLE_CHANNELS) 563 return -EINVAL; 564 565 if (!differential) 566 return ADS1119_MUX_AIN0 + ain_pos; 567 568 if (ain_pos == 0 && ain_neg == 1) 569 return ADS1119_MUX_AIN0_AIN1; 570 else if (ain_pos == 1 && ain_neg == 2) 571 return ADS1119_MUX_AIN1_AIN2; 572 else if (ain_pos == 2 && ain_neg == 3) 573 return ADS1119_MUX_AIN2_AIN3; 574 575 return -EINVAL; 576 } 577 578 static int ads1119_alloc_and_config_channels(struct iio_dev *indio_dev) 579 { 580 const struct iio_chan_spec ads1119_channel = 581 (const struct iio_chan_spec) { 582 .type = IIO_VOLTAGE, 583 .indexed = 1, 584 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 585 BIT(IIO_CHAN_INFO_SCALE) | 586 BIT(IIO_CHAN_INFO_OFFSET) | 587 BIT(IIO_CHAN_INFO_SAMP_FREQ), 588 .info_mask_shared_by_all_available = 589 BIT(IIO_CHAN_INFO_SCALE) | 590 BIT(IIO_CHAN_INFO_SAMP_FREQ), 591 .scan_type = { 592 .sign = 's', 593 .realbits = 16, 594 .storagebits = 16, 595 .endianness = IIO_CPU, 596 }, 597 }; 598 const struct iio_chan_spec ads1119_ts = IIO_CHAN_SOFT_TIMESTAMP(0); 599 struct ads1119_state *st = iio_priv(indio_dev); 600 struct iio_chan_spec *iio_channels, *chan; 601 struct device *dev = &st->client->dev; 602 unsigned int num_channels, i; 603 bool differential; 604 u32 ain[2]; 605 int ret; 606 607 st->num_channels_cfg = device_get_child_node_count(dev); 608 if (st->num_channels_cfg > ADS1119_MAX_CHANNELS) 609 return dev_err_probe(dev, -EINVAL, 610 "Too many channels %d, max is %d\n", 611 st->num_channels_cfg, 612 ADS1119_MAX_CHANNELS); 613 614 st->channels_cfg = devm_kcalloc(dev, st->num_channels_cfg, 615 sizeof(*st->channels_cfg), GFP_KERNEL); 616 if (!st->channels_cfg) 617 return -ENOMEM; 618 619 /* Allocate one more iio channel for the timestamp */ 620 num_channels = st->num_channels_cfg + 1; 621 iio_channels = devm_kcalloc(dev, num_channels, sizeof(*iio_channels), 622 GFP_KERNEL); 623 if (!iio_channels) 624 return -ENOMEM; 625 626 i = 0; 627 628 device_for_each_child_node_scoped(dev, child) { 629 chan = &iio_channels[i]; 630 631 differential = fwnode_property_present(child, "diff-channels"); 632 if (differential) 633 ret = fwnode_property_read_u32_array(child, 634 "diff-channels", 635 ain, 2); 636 else 637 ret = fwnode_property_read_u32(child, "single-channel", 638 &ain[0]); 639 640 if (ret) 641 return dev_err_probe(dev, ret, 642 "Failed to get channel property\n"); 643 644 ret = ads1119_map_analog_inputs_mux(ain[0], ain[1], 645 differential); 646 if (ret < 0) 647 return dev_err_probe(dev, ret, 648 "Invalid channel value\n"); 649 650 st->channels_cfg[i].mux = ret; 651 st->channels_cfg[i].gain = ADS1119_DEFAULT_GAIN; 652 st->channels_cfg[i].datarate = ADS1119_DEFAULT_DATARATE; 653 654 *chan = ads1119_channel; 655 chan->channel = ain[0]; 656 chan->address = i; 657 chan->scan_index = i; 658 659 if (differential) { 660 chan->channel2 = ain[1]; 661 chan->differential = 1; 662 } 663 664 dev_dbg(dev, "channel: index %d, mux %d\n", i, 665 st->channels_cfg[i].mux); 666 667 i++; 668 } 669 670 iio_channels[i] = ads1119_ts; 671 iio_channels[i].address = i; 672 iio_channels[i].scan_index = i; 673 674 indio_dev->channels = iio_channels; 675 indio_dev->num_channels = num_channels; 676 677 return 0; 678 } 679 680 static void ads1119_powerdown(void *data) 681 { 682 struct ads1119_state *st = data; 683 684 i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN); 685 } 686 687 static int ads1119_probe(struct i2c_client *client) 688 { 689 struct iio_dev *indio_dev; 690 struct ads1119_state *st; 691 struct device *dev = &client->dev; 692 bool vref_external = true; 693 int ret; 694 695 indio_dev = devm_iio_device_alloc(dev, sizeof(*st)); 696 if (!indio_dev) 697 return -ENOMEM; 698 699 st = iio_priv(indio_dev); 700 st->client = client; 701 702 indio_dev->name = "ads1119"; 703 indio_dev->info = &ads1119_info; 704 indio_dev->modes = INDIO_DIRECT_MODE; 705 706 i2c_set_clientdata(client, indio_dev); 707 708 ret = devm_regulator_bulk_get_enable(dev, 709 ARRAY_SIZE(ads1119_power_supplies), 710 ads1119_power_supplies); 711 if (ret) 712 return dev_err_probe(dev, ret, 713 "Failed to get and enable supplies\n"); 714 715 st->vref_uV = devm_regulator_get_enable_read_voltage(dev, "vref"); 716 if (st->vref_uV == -ENODEV) { 717 vref_external = false; 718 st->vref_uV = ADS1119_VREF_INTERNAL_VAL; 719 } else if (st->vref_uV < 0) { 720 return dev_err_probe(dev, st->vref_uV, "Failed to get vref\n"); 721 } 722 723 st->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 724 if (IS_ERR(st->reset_gpio)) 725 return dev_err_probe(dev, PTR_ERR(st->reset_gpio), 726 "Failed to get reset gpio\n"); 727 728 ret = ads1119_alloc_and_config_channels(indio_dev); 729 if (ret) 730 return ret; 731 732 init_completion(&st->completion); 733 734 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, 735 ads1119_trigger_handler, 736 &ads1119_buffer_setup_ops); 737 if (ret) 738 return dev_err_probe(dev, ret, "Failed to setup IIO buffer\n"); 739 740 if (client->irq > 0) { 741 ret = devm_request_irq(dev, client->irq, ads1119_irq_handler, 742 IRQF_NO_THREAD, "ads1119", indio_dev); 743 if (ret) 744 return ret; 745 746 st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", 747 indio_dev->name, 748 iio_device_id(indio_dev)); 749 if (!st->trig) 750 return -ENOMEM; 751 752 st->trig->ops = &ads1119_trigger_ops; 753 iio_trigger_set_drvdata(st->trig, indio_dev); 754 755 ret = devm_iio_trigger_register(dev, st->trig); 756 if (ret) 757 return dev_err_probe(dev, ret, 758 "Failed to register IIO trigger\n"); 759 } 760 761 ret = ads1119_init(st, vref_external); 762 if (ret) 763 return dev_err_probe(dev, ret, 764 "Failed to initialize device\n"); 765 766 pm_runtime_set_autosuspend_delay(dev, ADS1119_SUSPEND_DELAY); 767 pm_runtime_use_autosuspend(dev); 768 pm_runtime_mark_last_busy(dev); 769 pm_runtime_set_active(dev); 770 771 ret = devm_pm_runtime_enable(dev); 772 if (ret) 773 return dev_err_probe(dev, ret, "Failed to enable pm runtime\n"); 774 775 ret = devm_add_action_or_reset(dev, ads1119_powerdown, st); 776 if (ret) 777 return ret; 778 779 return devm_iio_device_register(dev, indio_dev); 780 } 781 782 static int ads1119_runtime_suspend(struct device *dev) 783 { 784 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 785 struct ads1119_state *st = iio_priv(indio_dev); 786 787 return i2c_smbus_write_byte(st->client, ADS1119_CMD_POWERDOWN); 788 } 789 790 /* 791 * The ADS1119 does not require a resume function because it automatically 792 * powers on after a reset. 793 * After a power down command, the ADS1119 can still communicate but turns off 794 * its analog parts. To resume from power down, the device will power up again 795 * upon receiving a start/sync command. 796 */ 797 static DEFINE_RUNTIME_DEV_PM_OPS(ads1119_pm_ops, ads1119_runtime_suspend, 798 NULL, NULL); 799 800 static const struct of_device_id __maybe_unused ads1119_of_match[] = { 801 { .compatible = "ti,ads1119" }, 802 { } 803 }; 804 MODULE_DEVICE_TABLE(of, ads1119_of_match); 805 806 static const struct i2c_device_id ads1119_id[] = { 807 { "ads1119" }, 808 { } 809 }; 810 MODULE_DEVICE_TABLE(i2c, ads1119_id); 811 812 static struct i2c_driver ads1119_driver = { 813 .driver = { 814 .name = "ads1119", 815 .of_match_table = ads1119_of_match, 816 .pm = pm_ptr(&ads1119_pm_ops), 817 }, 818 .probe = ads1119_probe, 819 .id_table = ads1119_id, 820 }; 821 module_i2c_driver(ads1119_driver); 822 823 MODULE_AUTHOR("João Paulo Gonçalves <joao.goncalves@toradex.com>"); 824 MODULE_DESCRIPTION("Texas Instruments ADS1119 ADC Driver"); 825 MODULE_LICENSE("GPL"); 826