1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ADS1015 - Texas Instruments Analog-to-Digital Converter 4 * 5 * Copyright (c) 2016, Intel Corporation. 6 * 7 * IIO driver for ADS1015 ADC 7-bit I2C slave address: 8 * * 0x48 - ADDR connected to Ground 9 * * 0x49 - ADDR connected to Vdd 10 * * 0x4A - ADDR connected to SDA 11 * * 0x4B - ADDR connected to SCL 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/irq.h> 17 #include <linux/i2c.h> 18 #include <linux/property.h> 19 #include <linux/regmap.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/mutex.h> 22 #include <linux/delay.h> 23 24 #include <linux/iio/iio.h> 25 #include <linux/iio/types.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/events.h> 28 #include <linux/iio/buffer.h> 29 #include <linux/iio/triggered_buffer.h> 30 #include <linux/iio/trigger_consumer.h> 31 32 #define ADS1015_DRV_NAME "ads1015" 33 34 #define ADS1015_CHANNELS 8 35 36 #define ADS1015_CONV_REG 0x00 37 #define ADS1015_CFG_REG 0x01 38 #define ADS1015_LO_THRESH_REG 0x02 39 #define ADS1015_HI_THRESH_REG 0x03 40 41 #define ADS1015_CFG_COMP_QUE_SHIFT 0 42 #define ADS1015_CFG_COMP_LAT_SHIFT 2 43 #define ADS1015_CFG_COMP_POL_SHIFT 3 44 #define ADS1015_CFG_COMP_MODE_SHIFT 4 45 #define ADS1015_CFG_DR_SHIFT 5 46 #define ADS1015_CFG_MOD_SHIFT 8 47 #define ADS1015_CFG_PGA_SHIFT 9 48 #define ADS1015_CFG_MUX_SHIFT 12 49 50 #define ADS1015_CFG_COMP_QUE_MASK GENMASK(1, 0) 51 #define ADS1015_CFG_COMP_LAT_MASK BIT(2) 52 #define ADS1015_CFG_COMP_POL_MASK BIT(3) 53 #define ADS1015_CFG_COMP_MODE_MASK BIT(4) 54 #define ADS1015_CFG_DR_MASK GENMASK(7, 5) 55 #define ADS1015_CFG_MOD_MASK BIT(8) 56 #define ADS1015_CFG_PGA_MASK GENMASK(11, 9) 57 #define ADS1015_CFG_MUX_MASK GENMASK(14, 12) 58 59 /* Comparator queue and disable field */ 60 #define ADS1015_CFG_COMP_DISABLE 3 61 62 /* Comparator polarity field */ 63 #define ADS1015_CFG_COMP_POL_LOW 0 64 #define ADS1015_CFG_COMP_POL_HIGH 1 65 66 /* Comparator mode field */ 67 #define ADS1015_CFG_COMP_MODE_TRAD 0 68 #define ADS1015_CFG_COMP_MODE_WINDOW 1 69 70 /* device operating modes */ 71 #define ADS1015_CONTINUOUS 0 72 #define ADS1015_SINGLESHOT 1 73 74 #define ADS1015_SLEEP_DELAY_MS 2000 75 #define ADS1015_DEFAULT_PGA 2 76 #define ADS1015_DEFAULT_DATA_RATE 4 77 #define ADS1015_DEFAULT_CHAN 0 78 79 struct ads1015_chip_data { 80 struct iio_chan_spec const *channels; 81 int num_channels; 82 const struct iio_info *info; 83 const int *data_rate; 84 const int data_rate_len; 85 const int *scale; 86 const int scale_len; 87 bool has_comparator; 88 }; 89 90 enum ads1015_channels { 91 ADS1015_AIN0_AIN1 = 0, 92 ADS1015_AIN0_AIN3, 93 ADS1015_AIN1_AIN3, 94 ADS1015_AIN2_AIN3, 95 ADS1015_AIN0, 96 ADS1015_AIN1, 97 ADS1015_AIN2, 98 ADS1015_AIN3, 99 ADS1015_TIMESTAMP, 100 }; 101 102 static const int ads1015_data_rate[] = { 103 128, 250, 490, 920, 1600, 2400, 3300, 3300 104 }; 105 106 static const int ads1115_data_rate[] = { 107 8, 16, 32, 64, 128, 250, 475, 860 108 }; 109 110 /* 111 * Translation from PGA bits to full-scale positive and negative input voltage 112 * range in mV 113 */ 114 static const int ads1015_fullscale_range[] = { 115 6144, 4096, 2048, 1024, 512, 256, 256, 256 116 }; 117 118 static const int ads1015_scale[] = { /* 12bit ADC */ 119 256, 11, 120 512, 11, 121 1024, 11, 122 2048, 11, 123 4096, 11, 124 6144, 11 125 }; 126 127 static const int ads1115_scale[] = { /* 16bit ADC */ 128 256, 15, 129 512, 15, 130 1024, 15, 131 2048, 15, 132 4096, 15, 133 6144, 15 134 }; 135 136 /* 137 * Translation from COMP_QUE field value to the number of successive readings 138 * exceed the threshold values before an interrupt is generated 139 */ 140 static const int ads1015_comp_queue[] = { 1, 2, 4 }; 141 142 static const struct iio_event_spec ads1015_events[] = { 143 { 144 .type = IIO_EV_TYPE_THRESH, 145 .dir = IIO_EV_DIR_RISING, 146 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 147 BIT(IIO_EV_INFO_ENABLE), 148 }, { 149 .type = IIO_EV_TYPE_THRESH, 150 .dir = IIO_EV_DIR_FALLING, 151 .mask_separate = BIT(IIO_EV_INFO_VALUE), 152 }, { 153 .type = IIO_EV_TYPE_THRESH, 154 .dir = IIO_EV_DIR_EITHER, 155 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | 156 BIT(IIO_EV_INFO_PERIOD), 157 }, 158 }; 159 160 /* 161 * Compile-time check whether _fitbits can accommodate up to _testbits 162 * bits. Returns _fitbits on success, fails to compile otherwise. 163 * 164 * The test works such that it multiplies constant _fitbits by constant 165 * double-negation of size of a non-empty structure, i.e. it multiplies 166 * constant _fitbits by constant 1 in each successful compilation case. 167 * The non-empty structure may contain C11 _Static_assert(), make use of 168 * this and place the kernel variant of static assert in there, so that 169 * it performs the compile-time check for _testbits <= _fitbits. Note 170 * that it is not possible to directly use static_assert in compound 171 * statements, hence this convoluted construct. 172 */ 173 #define FIT_CHECK(_testbits, _fitbits) \ 174 ( \ 175 (_fitbits) * \ 176 !!sizeof(struct { \ 177 static_assert((_testbits) <= (_fitbits)); \ 178 int pad; \ 179 }) \ 180 ) 181 182 #define ADS1015_V_CHAN(_chan, _addr, _realbits, _shift, _event_spec, _num_event_specs) { \ 183 .type = IIO_VOLTAGE, \ 184 .indexed = 1, \ 185 .address = _addr, \ 186 .channel = _chan, \ 187 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 188 BIT(IIO_CHAN_INFO_SCALE) | \ 189 BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 190 .info_mask_shared_by_all_available = \ 191 BIT(IIO_CHAN_INFO_SCALE) | \ 192 BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 193 .scan_index = _addr, \ 194 .scan_type = { \ 195 .sign = 's', \ 196 .realbits = (_realbits), \ 197 .storagebits = FIT_CHECK((_realbits) + (_shift), 16), \ 198 .shift = (_shift), \ 199 .endianness = IIO_CPU, \ 200 }, \ 201 .event_spec = (_event_spec), \ 202 .num_event_specs = (_num_event_specs), \ 203 .datasheet_name = "AIN"#_chan, \ 204 } 205 206 #define ADS1015_V_DIFF_CHAN(_chan, _chan2, _addr, _realbits, _shift, _event_spec, _num_event_specs) { \ 207 .type = IIO_VOLTAGE, \ 208 .differential = 1, \ 209 .indexed = 1, \ 210 .address = _addr, \ 211 .channel = _chan, \ 212 .channel2 = _chan2, \ 213 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 214 BIT(IIO_CHAN_INFO_SCALE) | \ 215 BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 216 .info_mask_shared_by_all_available = \ 217 BIT(IIO_CHAN_INFO_SCALE) | \ 218 BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 219 .scan_index = _addr, \ 220 .scan_type = { \ 221 .sign = 's', \ 222 .realbits = (_realbits), \ 223 .storagebits = FIT_CHECK((_realbits) + (_shift), 16), \ 224 .shift = (_shift), \ 225 .endianness = IIO_CPU, \ 226 }, \ 227 .event_spec = (_event_spec), \ 228 .num_event_specs = (_num_event_specs), \ 229 .datasheet_name = "AIN"#_chan"-AIN"#_chan2, \ 230 } 231 232 struct ads1015_channel_data { 233 bool enabled; 234 unsigned int pga; 235 unsigned int data_rate; 236 }; 237 238 struct ads1015_thresh_data { 239 unsigned int comp_queue; 240 int high_thresh; 241 int low_thresh; 242 }; 243 244 struct ads1015_data { 245 struct regmap *regmap; 246 /* 247 * Protects ADC ops, e.g: concurrent sysfs/buffered 248 * data reads, configuration updates 249 */ 250 struct mutex lock; 251 struct ads1015_channel_data channel_data[ADS1015_CHANNELS]; 252 253 unsigned int event_channel; 254 unsigned int comp_mode; 255 struct ads1015_thresh_data thresh_data[ADS1015_CHANNELS]; 256 257 const struct ads1015_chip_data *chip; 258 /* 259 * Set to true when the ADC is switched to the continuous-conversion 260 * mode and exits from a power-down state. This flag is used to avoid 261 * getting the stale result from the conversion register. 262 */ 263 bool conv_invalid; 264 }; 265 266 static bool ads1015_event_channel_enabled(struct ads1015_data *data) 267 { 268 return (data->event_channel != ADS1015_CHANNELS); 269 } 270 271 static void ads1015_event_channel_enable(struct ads1015_data *data, int chan, 272 int comp_mode) 273 { 274 WARN_ON(ads1015_event_channel_enabled(data)); 275 276 data->event_channel = chan; 277 data->comp_mode = comp_mode; 278 } 279 280 static void ads1015_event_channel_disable(struct ads1015_data *data, int chan) 281 { 282 data->event_channel = ADS1015_CHANNELS; 283 } 284 285 static const struct regmap_range ads1015_writeable_ranges[] = { 286 regmap_reg_range(ADS1015_CFG_REG, ADS1015_HI_THRESH_REG), 287 }; 288 289 static const struct regmap_access_table ads1015_writeable_table = { 290 .yes_ranges = ads1015_writeable_ranges, 291 .n_yes_ranges = ARRAY_SIZE(ads1015_writeable_ranges), 292 }; 293 294 static const struct regmap_config ads1015_regmap_config = { 295 .reg_bits = 8, 296 .val_bits = 16, 297 .max_register = ADS1015_HI_THRESH_REG, 298 .wr_table = &ads1015_writeable_table, 299 }; 300 301 static const struct regmap_range tla2024_writeable_ranges[] = { 302 regmap_reg_range(ADS1015_CFG_REG, ADS1015_CFG_REG), 303 }; 304 305 static const struct regmap_access_table tla2024_writeable_table = { 306 .yes_ranges = tla2024_writeable_ranges, 307 .n_yes_ranges = ARRAY_SIZE(tla2024_writeable_ranges), 308 }; 309 310 static const struct regmap_config tla2024_regmap_config = { 311 .reg_bits = 8, 312 .val_bits = 16, 313 .max_register = ADS1015_CFG_REG, 314 .wr_table = &tla2024_writeable_table, 315 }; 316 317 static const struct iio_chan_spec ads1015_channels[] = { 318 ADS1015_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1, 12, 4, 319 ads1015_events, ARRAY_SIZE(ads1015_events)), 320 ADS1015_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3, 12, 4, 321 ads1015_events, ARRAY_SIZE(ads1015_events)), 322 ADS1015_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3, 12, 4, 323 ads1015_events, ARRAY_SIZE(ads1015_events)), 324 ADS1015_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3, 12, 4, 325 ads1015_events, ARRAY_SIZE(ads1015_events)), 326 ADS1015_V_CHAN(0, ADS1015_AIN0, 12, 4, 327 ads1015_events, ARRAY_SIZE(ads1015_events)), 328 ADS1015_V_CHAN(1, ADS1015_AIN1, 12, 4, 329 ads1015_events, ARRAY_SIZE(ads1015_events)), 330 ADS1015_V_CHAN(2, ADS1015_AIN2, 12, 4, 331 ads1015_events, ARRAY_SIZE(ads1015_events)), 332 ADS1015_V_CHAN(3, ADS1015_AIN3, 12, 4, 333 ads1015_events, ARRAY_SIZE(ads1015_events)), 334 IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP), 335 }; 336 337 static const struct iio_chan_spec ads1115_channels[] = { 338 ADS1015_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1, 16, 0, 339 ads1015_events, ARRAY_SIZE(ads1015_events)), 340 ADS1015_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3, 16, 0, 341 ads1015_events, ARRAY_SIZE(ads1015_events)), 342 ADS1015_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3, 16, 0, 343 ads1015_events, ARRAY_SIZE(ads1015_events)), 344 ADS1015_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3, 16, 0, 345 ads1015_events, ARRAY_SIZE(ads1015_events)), 346 ADS1015_V_CHAN(0, ADS1015_AIN0, 16, 0, 347 ads1015_events, ARRAY_SIZE(ads1015_events)), 348 ADS1015_V_CHAN(1, ADS1015_AIN1, 16, 0, 349 ads1015_events, ARRAY_SIZE(ads1015_events)), 350 ADS1015_V_CHAN(2, ADS1015_AIN2, 16, 0, 351 ads1015_events, ARRAY_SIZE(ads1015_events)), 352 ADS1015_V_CHAN(3, ADS1015_AIN3, 16, 0, 353 ads1015_events, ARRAY_SIZE(ads1015_events)), 354 IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP), 355 }; 356 357 static const struct iio_chan_spec tla2024_channels[] = { 358 ADS1015_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1, 12, 4, NULL, 0), 359 ADS1015_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3, 12, 4, NULL, 0), 360 ADS1015_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3, 12, 4, NULL, 0), 361 ADS1015_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3, 12, 4, NULL, 0), 362 ADS1015_V_CHAN(0, ADS1015_AIN0, 12, 4, NULL, 0), 363 ADS1015_V_CHAN(1, ADS1015_AIN1, 12, 4, NULL, 0), 364 ADS1015_V_CHAN(2, ADS1015_AIN2, 12, 4, NULL, 0), 365 ADS1015_V_CHAN(3, ADS1015_AIN3, 12, 4, NULL, 0), 366 IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP), 367 }; 368 369 370 #ifdef CONFIG_PM 371 static int ads1015_set_power_state(struct ads1015_data *data, bool on) 372 { 373 int ret; 374 struct device *dev = regmap_get_device(data->regmap); 375 376 if (on) { 377 ret = pm_runtime_resume_and_get(dev); 378 } else { 379 pm_runtime_mark_last_busy(dev); 380 ret = pm_runtime_put_autosuspend(dev); 381 } 382 383 return ret < 0 ? ret : 0; 384 } 385 386 #else /* !CONFIG_PM */ 387 388 static int ads1015_set_power_state(struct ads1015_data *data, bool on) 389 { 390 return 0; 391 } 392 393 #endif /* !CONFIG_PM */ 394 395 static 396 int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val) 397 { 398 const int *data_rate = data->chip->data_rate; 399 int ret, pga, dr, dr_old, conv_time; 400 unsigned int old, mask, cfg; 401 402 if (chan < 0 || chan >= ADS1015_CHANNELS) 403 return -EINVAL; 404 405 ret = regmap_read(data->regmap, ADS1015_CFG_REG, &old); 406 if (ret) 407 return ret; 408 409 pga = data->channel_data[chan].pga; 410 dr = data->channel_data[chan].data_rate; 411 mask = ADS1015_CFG_MUX_MASK | ADS1015_CFG_PGA_MASK | 412 ADS1015_CFG_DR_MASK; 413 cfg = chan << ADS1015_CFG_MUX_SHIFT | pga << ADS1015_CFG_PGA_SHIFT | 414 dr << ADS1015_CFG_DR_SHIFT; 415 416 if (ads1015_event_channel_enabled(data)) { 417 mask |= ADS1015_CFG_COMP_QUE_MASK | ADS1015_CFG_COMP_MODE_MASK; 418 cfg |= data->thresh_data[chan].comp_queue << 419 ADS1015_CFG_COMP_QUE_SHIFT | 420 data->comp_mode << 421 ADS1015_CFG_COMP_MODE_SHIFT; 422 } 423 424 cfg = (old & ~mask) | (cfg & mask); 425 if (old != cfg) { 426 ret = regmap_write(data->regmap, ADS1015_CFG_REG, cfg); 427 if (ret) 428 return ret; 429 data->conv_invalid = true; 430 } 431 if (data->conv_invalid) { 432 dr_old = (old & ADS1015_CFG_DR_MASK) >> ADS1015_CFG_DR_SHIFT; 433 conv_time = DIV_ROUND_UP(USEC_PER_SEC, data_rate[dr_old]); 434 conv_time += DIV_ROUND_UP(USEC_PER_SEC, data_rate[dr]); 435 conv_time += conv_time / 10; /* 10% internal clock inaccuracy */ 436 usleep_range(conv_time, conv_time + 1); 437 data->conv_invalid = false; 438 } 439 440 return regmap_read(data->regmap, ADS1015_CONV_REG, val); 441 } 442 443 static irqreturn_t ads1015_trigger_handler(int irq, void *p) 444 { 445 struct iio_poll_func *pf = p; 446 struct iio_dev *indio_dev = pf->indio_dev; 447 struct ads1015_data *data = iio_priv(indio_dev); 448 /* Ensure natural alignment of timestamp */ 449 struct { 450 s16 chan; 451 s64 timestamp __aligned(8); 452 } scan; 453 int chan, ret, res; 454 455 memset(&scan, 0, sizeof(scan)); 456 457 mutex_lock(&data->lock); 458 chan = find_first_bit(indio_dev->active_scan_mask, 459 indio_dev->masklength); 460 ret = ads1015_get_adc_result(data, chan, &res); 461 if (ret < 0) { 462 mutex_unlock(&data->lock); 463 goto err; 464 } 465 466 scan.chan = res; 467 mutex_unlock(&data->lock); 468 469 iio_push_to_buffers_with_timestamp(indio_dev, &scan, 470 iio_get_time_ns(indio_dev)); 471 472 err: 473 iio_trigger_notify_done(indio_dev->trig); 474 475 return IRQ_HANDLED; 476 } 477 478 static int ads1015_set_scale(struct ads1015_data *data, 479 struct iio_chan_spec const *chan, 480 int scale, int uscale) 481 { 482 int i; 483 int fullscale = div_s64((scale * 1000000LL + uscale) << 484 (chan->scan_type.realbits - 1), 1000000); 485 486 for (i = 0; i < ARRAY_SIZE(ads1015_fullscale_range); i++) { 487 if (ads1015_fullscale_range[i] == fullscale) { 488 data->channel_data[chan->address].pga = i; 489 return 0; 490 } 491 } 492 493 return -EINVAL; 494 } 495 496 static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate) 497 { 498 int i; 499 500 for (i = 0; i < data->chip->data_rate_len; i++) { 501 if (data->chip->data_rate[i] == rate) { 502 data->channel_data[chan].data_rate = i; 503 return 0; 504 } 505 } 506 507 return -EINVAL; 508 } 509 510 static int ads1015_read_avail(struct iio_dev *indio_dev, 511 struct iio_chan_spec const *chan, 512 const int **vals, int *type, int *length, 513 long mask) 514 { 515 struct ads1015_data *data = iio_priv(indio_dev); 516 517 if (chan->type != IIO_VOLTAGE) 518 return -EINVAL; 519 520 switch (mask) { 521 case IIO_CHAN_INFO_SCALE: 522 *type = IIO_VAL_FRACTIONAL_LOG2; 523 *vals = data->chip->scale; 524 *length = data->chip->scale_len; 525 return IIO_AVAIL_LIST; 526 case IIO_CHAN_INFO_SAMP_FREQ: 527 *type = IIO_VAL_INT; 528 *vals = data->chip->data_rate; 529 *length = data->chip->data_rate_len; 530 return IIO_AVAIL_LIST; 531 default: 532 return -EINVAL; 533 } 534 } 535 536 static int ads1015_read_raw(struct iio_dev *indio_dev, 537 struct iio_chan_spec const *chan, int *val, 538 int *val2, long mask) 539 { 540 int ret, idx; 541 struct ads1015_data *data = iio_priv(indio_dev); 542 543 mutex_lock(&data->lock); 544 switch (mask) { 545 case IIO_CHAN_INFO_RAW: 546 ret = iio_device_claim_direct_mode(indio_dev); 547 if (ret) 548 break; 549 550 if (ads1015_event_channel_enabled(data) && 551 data->event_channel != chan->address) { 552 ret = -EBUSY; 553 goto release_direct; 554 } 555 556 ret = ads1015_set_power_state(data, true); 557 if (ret < 0) 558 goto release_direct; 559 560 ret = ads1015_get_adc_result(data, chan->address, val); 561 if (ret < 0) { 562 ads1015_set_power_state(data, false); 563 goto release_direct; 564 } 565 566 *val = sign_extend32(*val >> chan->scan_type.shift, 567 chan->scan_type.realbits - 1); 568 569 ret = ads1015_set_power_state(data, false); 570 if (ret < 0) 571 goto release_direct; 572 573 ret = IIO_VAL_INT; 574 release_direct: 575 iio_device_release_direct_mode(indio_dev); 576 break; 577 case IIO_CHAN_INFO_SCALE: 578 idx = data->channel_data[chan->address].pga; 579 *val = ads1015_fullscale_range[idx]; 580 *val2 = chan->scan_type.realbits - 1; 581 ret = IIO_VAL_FRACTIONAL_LOG2; 582 break; 583 case IIO_CHAN_INFO_SAMP_FREQ: 584 idx = data->channel_data[chan->address].data_rate; 585 *val = data->chip->data_rate[idx]; 586 ret = IIO_VAL_INT; 587 break; 588 default: 589 ret = -EINVAL; 590 break; 591 } 592 mutex_unlock(&data->lock); 593 594 return ret; 595 } 596 597 static int ads1015_write_raw(struct iio_dev *indio_dev, 598 struct iio_chan_spec const *chan, int val, 599 int val2, long mask) 600 { 601 struct ads1015_data *data = iio_priv(indio_dev); 602 int ret; 603 604 mutex_lock(&data->lock); 605 switch (mask) { 606 case IIO_CHAN_INFO_SCALE: 607 ret = ads1015_set_scale(data, chan, val, val2); 608 break; 609 case IIO_CHAN_INFO_SAMP_FREQ: 610 ret = ads1015_set_data_rate(data, chan->address, val); 611 break; 612 default: 613 ret = -EINVAL; 614 break; 615 } 616 mutex_unlock(&data->lock); 617 618 return ret; 619 } 620 621 static int ads1015_read_event(struct iio_dev *indio_dev, 622 const struct iio_chan_spec *chan, enum iio_event_type type, 623 enum iio_event_direction dir, enum iio_event_info info, int *val, 624 int *val2) 625 { 626 struct ads1015_data *data = iio_priv(indio_dev); 627 int ret; 628 unsigned int comp_queue; 629 int period; 630 int dr; 631 632 mutex_lock(&data->lock); 633 634 switch (info) { 635 case IIO_EV_INFO_VALUE: 636 *val = (dir == IIO_EV_DIR_RISING) ? 637 data->thresh_data[chan->address].high_thresh : 638 data->thresh_data[chan->address].low_thresh; 639 ret = IIO_VAL_INT; 640 break; 641 case IIO_EV_INFO_PERIOD: 642 dr = data->channel_data[chan->address].data_rate; 643 comp_queue = data->thresh_data[chan->address].comp_queue; 644 period = ads1015_comp_queue[comp_queue] * 645 USEC_PER_SEC / data->chip->data_rate[dr]; 646 647 *val = period / USEC_PER_SEC; 648 *val2 = period % USEC_PER_SEC; 649 ret = IIO_VAL_INT_PLUS_MICRO; 650 break; 651 default: 652 ret = -EINVAL; 653 break; 654 } 655 656 mutex_unlock(&data->lock); 657 658 return ret; 659 } 660 661 static int ads1015_write_event(struct iio_dev *indio_dev, 662 const struct iio_chan_spec *chan, enum iio_event_type type, 663 enum iio_event_direction dir, enum iio_event_info info, int val, 664 int val2) 665 { 666 struct ads1015_data *data = iio_priv(indio_dev); 667 const int *data_rate = data->chip->data_rate; 668 int realbits = chan->scan_type.realbits; 669 int ret = 0; 670 long long period; 671 int i; 672 int dr; 673 674 mutex_lock(&data->lock); 675 676 switch (info) { 677 case IIO_EV_INFO_VALUE: 678 if (val >= 1 << (realbits - 1) || val < -1 << (realbits - 1)) { 679 ret = -EINVAL; 680 break; 681 } 682 if (dir == IIO_EV_DIR_RISING) 683 data->thresh_data[chan->address].high_thresh = val; 684 else 685 data->thresh_data[chan->address].low_thresh = val; 686 break; 687 case IIO_EV_INFO_PERIOD: 688 dr = data->channel_data[chan->address].data_rate; 689 period = val * USEC_PER_SEC + val2; 690 691 for (i = 0; i < ARRAY_SIZE(ads1015_comp_queue) - 1; i++) { 692 if (period <= ads1015_comp_queue[i] * 693 USEC_PER_SEC / data_rate[dr]) 694 break; 695 } 696 data->thresh_data[chan->address].comp_queue = i; 697 break; 698 default: 699 ret = -EINVAL; 700 break; 701 } 702 703 mutex_unlock(&data->lock); 704 705 return ret; 706 } 707 708 static int ads1015_read_event_config(struct iio_dev *indio_dev, 709 const struct iio_chan_spec *chan, enum iio_event_type type, 710 enum iio_event_direction dir) 711 { 712 struct ads1015_data *data = iio_priv(indio_dev); 713 int ret = 0; 714 715 mutex_lock(&data->lock); 716 if (data->event_channel == chan->address) { 717 switch (dir) { 718 case IIO_EV_DIR_RISING: 719 ret = 1; 720 break; 721 case IIO_EV_DIR_EITHER: 722 ret = (data->comp_mode == ADS1015_CFG_COMP_MODE_WINDOW); 723 break; 724 default: 725 ret = -EINVAL; 726 break; 727 } 728 } 729 mutex_unlock(&data->lock); 730 731 return ret; 732 } 733 734 static int ads1015_enable_event_config(struct ads1015_data *data, 735 const struct iio_chan_spec *chan, int comp_mode) 736 { 737 int low_thresh = data->thresh_data[chan->address].low_thresh; 738 int high_thresh = data->thresh_data[chan->address].high_thresh; 739 int ret; 740 unsigned int val; 741 742 if (ads1015_event_channel_enabled(data)) { 743 if (data->event_channel != chan->address || 744 (data->comp_mode == ADS1015_CFG_COMP_MODE_TRAD && 745 comp_mode == ADS1015_CFG_COMP_MODE_WINDOW)) 746 return -EBUSY; 747 748 return 0; 749 } 750 751 if (comp_mode == ADS1015_CFG_COMP_MODE_TRAD) { 752 low_thresh = max(-1 << (chan->scan_type.realbits - 1), 753 high_thresh - 1); 754 } 755 ret = regmap_write(data->regmap, ADS1015_LO_THRESH_REG, 756 low_thresh << chan->scan_type.shift); 757 if (ret) 758 return ret; 759 760 ret = regmap_write(data->regmap, ADS1015_HI_THRESH_REG, 761 high_thresh << chan->scan_type.shift); 762 if (ret) 763 return ret; 764 765 ret = ads1015_set_power_state(data, true); 766 if (ret < 0) 767 return ret; 768 769 ads1015_event_channel_enable(data, chan->address, comp_mode); 770 771 ret = ads1015_get_adc_result(data, chan->address, &val); 772 if (ret) { 773 ads1015_event_channel_disable(data, chan->address); 774 ads1015_set_power_state(data, false); 775 } 776 777 return ret; 778 } 779 780 static int ads1015_disable_event_config(struct ads1015_data *data, 781 const struct iio_chan_spec *chan, int comp_mode) 782 { 783 int ret; 784 785 if (!ads1015_event_channel_enabled(data)) 786 return 0; 787 788 if (data->event_channel != chan->address) 789 return 0; 790 791 if (data->comp_mode == ADS1015_CFG_COMP_MODE_TRAD && 792 comp_mode == ADS1015_CFG_COMP_MODE_WINDOW) 793 return 0; 794 795 ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG, 796 ADS1015_CFG_COMP_QUE_MASK, 797 ADS1015_CFG_COMP_DISABLE << 798 ADS1015_CFG_COMP_QUE_SHIFT); 799 if (ret) 800 return ret; 801 802 ads1015_event_channel_disable(data, chan->address); 803 804 return ads1015_set_power_state(data, false); 805 } 806 807 static int ads1015_write_event_config(struct iio_dev *indio_dev, 808 const struct iio_chan_spec *chan, enum iio_event_type type, 809 enum iio_event_direction dir, int state) 810 { 811 struct ads1015_data *data = iio_priv(indio_dev); 812 int ret; 813 int comp_mode = (dir == IIO_EV_DIR_EITHER) ? 814 ADS1015_CFG_COMP_MODE_WINDOW : ADS1015_CFG_COMP_MODE_TRAD; 815 816 mutex_lock(&data->lock); 817 818 /* Prevent from enabling both buffer and event at a time */ 819 ret = iio_device_claim_direct_mode(indio_dev); 820 if (ret) { 821 mutex_unlock(&data->lock); 822 return ret; 823 } 824 825 if (state) 826 ret = ads1015_enable_event_config(data, chan, comp_mode); 827 else 828 ret = ads1015_disable_event_config(data, chan, comp_mode); 829 830 iio_device_release_direct_mode(indio_dev); 831 mutex_unlock(&data->lock); 832 833 return ret; 834 } 835 836 static irqreturn_t ads1015_event_handler(int irq, void *priv) 837 { 838 struct iio_dev *indio_dev = priv; 839 struct ads1015_data *data = iio_priv(indio_dev); 840 int val; 841 int ret; 842 843 /* Clear the latched ALERT/RDY pin */ 844 ret = regmap_read(data->regmap, ADS1015_CONV_REG, &val); 845 if (ret) 846 return IRQ_HANDLED; 847 848 if (ads1015_event_channel_enabled(data)) { 849 enum iio_event_direction dir; 850 u64 code; 851 852 dir = data->comp_mode == ADS1015_CFG_COMP_MODE_TRAD ? 853 IIO_EV_DIR_RISING : IIO_EV_DIR_EITHER; 854 code = IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, data->event_channel, 855 IIO_EV_TYPE_THRESH, dir); 856 iio_push_event(indio_dev, code, iio_get_time_ns(indio_dev)); 857 } 858 859 return IRQ_HANDLED; 860 } 861 862 static int ads1015_buffer_preenable(struct iio_dev *indio_dev) 863 { 864 struct ads1015_data *data = iio_priv(indio_dev); 865 866 /* Prevent from enabling both buffer and event at a time */ 867 if (ads1015_event_channel_enabled(data)) 868 return -EBUSY; 869 870 return ads1015_set_power_state(iio_priv(indio_dev), true); 871 } 872 873 static int ads1015_buffer_postdisable(struct iio_dev *indio_dev) 874 { 875 return ads1015_set_power_state(iio_priv(indio_dev), false); 876 } 877 878 static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = { 879 .preenable = ads1015_buffer_preenable, 880 .postdisable = ads1015_buffer_postdisable, 881 .validate_scan_mask = &iio_validate_scan_mask_onehot, 882 }; 883 884 static const struct iio_info ads1015_info = { 885 .read_avail = ads1015_read_avail, 886 .read_raw = ads1015_read_raw, 887 .write_raw = ads1015_write_raw, 888 .read_event_value = ads1015_read_event, 889 .write_event_value = ads1015_write_event, 890 .read_event_config = ads1015_read_event_config, 891 .write_event_config = ads1015_write_event_config, 892 }; 893 894 static const struct iio_info tla2024_info = { 895 .read_avail = ads1015_read_avail, 896 .read_raw = ads1015_read_raw, 897 .write_raw = ads1015_write_raw, 898 }; 899 900 static int ads1015_client_get_channels_config(struct i2c_client *client) 901 { 902 struct iio_dev *indio_dev = i2c_get_clientdata(client); 903 struct ads1015_data *data = iio_priv(indio_dev); 904 struct device *dev = &client->dev; 905 struct fwnode_handle *node; 906 int i = -1; 907 908 device_for_each_child_node(dev, node) { 909 u32 pval; 910 unsigned int channel; 911 unsigned int pga = ADS1015_DEFAULT_PGA; 912 unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE; 913 914 if (fwnode_property_read_u32(node, "reg", &pval)) { 915 dev_err(dev, "invalid reg on %pfw\n", node); 916 continue; 917 } 918 919 channel = pval; 920 if (channel >= ADS1015_CHANNELS) { 921 dev_err(dev, "invalid channel index %d on %pfw\n", 922 channel, node); 923 continue; 924 } 925 926 if (!fwnode_property_read_u32(node, "ti,gain", &pval)) { 927 pga = pval; 928 if (pga > 6) { 929 dev_err(dev, "invalid gain on %pfw\n", node); 930 fwnode_handle_put(node); 931 return -EINVAL; 932 } 933 } 934 935 if (!fwnode_property_read_u32(node, "ti,datarate", &pval)) { 936 data_rate = pval; 937 if (data_rate > 7) { 938 dev_err(dev, "invalid data_rate on %pfw\n", node); 939 fwnode_handle_put(node); 940 return -EINVAL; 941 } 942 } 943 944 data->channel_data[channel].pga = pga; 945 data->channel_data[channel].data_rate = data_rate; 946 947 i++; 948 } 949 950 return i < 0 ? -EINVAL : 0; 951 } 952 953 static void ads1015_get_channels_config(struct i2c_client *client) 954 { 955 unsigned int k; 956 957 struct iio_dev *indio_dev = i2c_get_clientdata(client); 958 struct ads1015_data *data = iio_priv(indio_dev); 959 960 if (!ads1015_client_get_channels_config(client)) 961 return; 962 963 /* fallback on default configuration */ 964 for (k = 0; k < ADS1015_CHANNELS; ++k) { 965 data->channel_data[k].pga = ADS1015_DEFAULT_PGA; 966 data->channel_data[k].data_rate = ADS1015_DEFAULT_DATA_RATE; 967 } 968 } 969 970 static int ads1015_set_conv_mode(struct ads1015_data *data, int mode) 971 { 972 return regmap_update_bits(data->regmap, ADS1015_CFG_REG, 973 ADS1015_CFG_MOD_MASK, 974 mode << ADS1015_CFG_MOD_SHIFT); 975 } 976 977 static int ads1015_probe(struct i2c_client *client) 978 { 979 const struct ads1015_chip_data *chip; 980 struct iio_dev *indio_dev; 981 struct ads1015_data *data; 982 int ret; 983 int i; 984 985 chip = i2c_get_match_data(client); 986 if (!chip) 987 return dev_err_probe(&client->dev, -EINVAL, "Unknown chip\n"); 988 989 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 990 if (!indio_dev) 991 return -ENOMEM; 992 993 data = iio_priv(indio_dev); 994 i2c_set_clientdata(client, indio_dev); 995 996 mutex_init(&data->lock); 997 998 indio_dev->name = ADS1015_DRV_NAME; 999 indio_dev->modes = INDIO_DIRECT_MODE; 1000 1001 indio_dev->channels = chip->channels; 1002 indio_dev->num_channels = chip->num_channels; 1003 indio_dev->info = chip->info; 1004 data->chip = chip; 1005 data->event_channel = ADS1015_CHANNELS; 1006 1007 /* 1008 * Set default lower and upper threshold to min and max value 1009 * respectively. 1010 */ 1011 for (i = 0; i < ADS1015_CHANNELS; i++) { 1012 int realbits = indio_dev->channels[i].scan_type.realbits; 1013 1014 data->thresh_data[i].low_thresh = -1 << (realbits - 1); 1015 data->thresh_data[i].high_thresh = (1 << (realbits - 1)) - 1; 1016 } 1017 1018 /* we need to keep this ABI the same as used by hwmon ADS1015 driver */ 1019 ads1015_get_channels_config(client); 1020 1021 data->regmap = devm_regmap_init_i2c(client, chip->has_comparator ? 1022 &ads1015_regmap_config : 1023 &tla2024_regmap_config); 1024 if (IS_ERR(data->regmap)) { 1025 dev_err(&client->dev, "Failed to allocate register map\n"); 1026 return PTR_ERR(data->regmap); 1027 } 1028 1029 ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL, 1030 ads1015_trigger_handler, 1031 &ads1015_buffer_setup_ops); 1032 if (ret < 0) { 1033 dev_err(&client->dev, "iio triggered buffer setup failed\n"); 1034 return ret; 1035 } 1036 1037 if (client->irq && chip->has_comparator) { 1038 unsigned long irq_trig = 1039 irqd_get_trigger_type(irq_get_irq_data(client->irq)); 1040 unsigned int cfg_comp_mask = ADS1015_CFG_COMP_QUE_MASK | 1041 ADS1015_CFG_COMP_LAT_MASK | ADS1015_CFG_COMP_POL_MASK; 1042 unsigned int cfg_comp = 1043 ADS1015_CFG_COMP_DISABLE << ADS1015_CFG_COMP_QUE_SHIFT | 1044 1 << ADS1015_CFG_COMP_LAT_SHIFT; 1045 1046 switch (irq_trig) { 1047 case IRQF_TRIGGER_FALLING: 1048 case IRQF_TRIGGER_LOW: 1049 cfg_comp |= ADS1015_CFG_COMP_POL_LOW << 1050 ADS1015_CFG_COMP_POL_SHIFT; 1051 break; 1052 case IRQF_TRIGGER_HIGH: 1053 case IRQF_TRIGGER_RISING: 1054 cfg_comp |= ADS1015_CFG_COMP_POL_HIGH << 1055 ADS1015_CFG_COMP_POL_SHIFT; 1056 break; 1057 default: 1058 return -EINVAL; 1059 } 1060 1061 ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG, 1062 cfg_comp_mask, cfg_comp); 1063 if (ret) 1064 return ret; 1065 1066 ret = devm_request_threaded_irq(&client->dev, client->irq, 1067 NULL, ads1015_event_handler, 1068 irq_trig | IRQF_ONESHOT, 1069 client->name, indio_dev); 1070 if (ret) 1071 return ret; 1072 } 1073 1074 ret = ads1015_set_conv_mode(data, ADS1015_CONTINUOUS); 1075 if (ret) 1076 return ret; 1077 1078 data->conv_invalid = true; 1079 1080 ret = pm_runtime_set_active(&client->dev); 1081 if (ret) 1082 return ret; 1083 pm_runtime_set_autosuspend_delay(&client->dev, ADS1015_SLEEP_DELAY_MS); 1084 pm_runtime_use_autosuspend(&client->dev); 1085 pm_runtime_enable(&client->dev); 1086 1087 ret = iio_device_register(indio_dev); 1088 if (ret < 0) { 1089 dev_err(&client->dev, "Failed to register IIO device\n"); 1090 return ret; 1091 } 1092 1093 return 0; 1094 } 1095 1096 static void ads1015_remove(struct i2c_client *client) 1097 { 1098 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1099 struct ads1015_data *data = iio_priv(indio_dev); 1100 int ret; 1101 1102 iio_device_unregister(indio_dev); 1103 1104 pm_runtime_disable(&client->dev); 1105 pm_runtime_set_suspended(&client->dev); 1106 1107 /* power down single shot mode */ 1108 ret = ads1015_set_conv_mode(data, ADS1015_SINGLESHOT); 1109 if (ret) 1110 dev_warn(&client->dev, "Failed to power down (%pe)\n", 1111 ERR_PTR(ret)); 1112 } 1113 1114 #ifdef CONFIG_PM 1115 static int ads1015_runtime_suspend(struct device *dev) 1116 { 1117 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1118 struct ads1015_data *data = iio_priv(indio_dev); 1119 1120 return ads1015_set_conv_mode(data, ADS1015_SINGLESHOT); 1121 } 1122 1123 static int ads1015_runtime_resume(struct device *dev) 1124 { 1125 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1126 struct ads1015_data *data = iio_priv(indio_dev); 1127 int ret; 1128 1129 ret = ads1015_set_conv_mode(data, ADS1015_CONTINUOUS); 1130 if (!ret) 1131 data->conv_invalid = true; 1132 1133 return ret; 1134 } 1135 #endif 1136 1137 static const struct dev_pm_ops ads1015_pm_ops = { 1138 SET_RUNTIME_PM_OPS(ads1015_runtime_suspend, 1139 ads1015_runtime_resume, NULL) 1140 }; 1141 1142 static const struct ads1015_chip_data ads1015_data = { 1143 .channels = ads1015_channels, 1144 .num_channels = ARRAY_SIZE(ads1015_channels), 1145 .info = &ads1015_info, 1146 .data_rate = ads1015_data_rate, 1147 .data_rate_len = ARRAY_SIZE(ads1015_data_rate), 1148 .scale = ads1015_scale, 1149 .scale_len = ARRAY_SIZE(ads1015_scale), 1150 .has_comparator = true, 1151 }; 1152 1153 static const struct ads1015_chip_data ads1115_data = { 1154 .channels = ads1115_channels, 1155 .num_channels = ARRAY_SIZE(ads1115_channels), 1156 .info = &ads1015_info, 1157 .data_rate = ads1115_data_rate, 1158 .data_rate_len = ARRAY_SIZE(ads1115_data_rate), 1159 .scale = ads1115_scale, 1160 .scale_len = ARRAY_SIZE(ads1115_scale), 1161 .has_comparator = true, 1162 }; 1163 1164 static const struct ads1015_chip_data tla2024_data = { 1165 .channels = tla2024_channels, 1166 .num_channels = ARRAY_SIZE(tla2024_channels), 1167 .info = &tla2024_info, 1168 .data_rate = ads1015_data_rate, 1169 .data_rate_len = ARRAY_SIZE(ads1015_data_rate), 1170 .scale = ads1015_scale, 1171 .scale_len = ARRAY_SIZE(ads1015_scale), 1172 .has_comparator = false, 1173 }; 1174 1175 static const struct i2c_device_id ads1015_id[] = { 1176 { "ads1015", (kernel_ulong_t)&ads1015_data }, 1177 { "ads1115", (kernel_ulong_t)&ads1115_data }, 1178 { "tla2024", (kernel_ulong_t)&tla2024_data }, 1179 {} 1180 }; 1181 MODULE_DEVICE_TABLE(i2c, ads1015_id); 1182 1183 static const struct of_device_id ads1015_of_match[] = { 1184 { .compatible = "ti,ads1015", .data = &ads1015_data }, 1185 { .compatible = "ti,ads1115", .data = &ads1115_data }, 1186 { .compatible = "ti,tla2024", .data = &tla2024_data }, 1187 {} 1188 }; 1189 MODULE_DEVICE_TABLE(of, ads1015_of_match); 1190 1191 static struct i2c_driver ads1015_driver = { 1192 .driver = { 1193 .name = ADS1015_DRV_NAME, 1194 .of_match_table = ads1015_of_match, 1195 .pm = &ads1015_pm_ops, 1196 }, 1197 .probe = ads1015_probe, 1198 .remove = ads1015_remove, 1199 .id_table = ads1015_id, 1200 }; 1201 1202 module_i2c_driver(ads1015_driver); 1203 1204 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); 1205 MODULE_DESCRIPTION("Texas Instruments ADS1015 ADC driver"); 1206 MODULE_LICENSE("GPL v2"); 1207