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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2020 InvenSense, Inc. * * Driver for InvenSense ICP-1010xx barometric pressure and temperature sensor. * * Datasheet: * http://www.invensense.com/wp-content/uploads/2018/01/DS-000186-ICP-101xx-v1.2.pdf */ #include <linux/device.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/i2c.h> #include <linux/pm_runtime.h> #include <linux/crc8.h> #include <linux/mutex.h> #include <linux/delay.h> #include <linux/log2.h> #include <linux/math64.h> #include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #define ICP10100_ID_REG_GET(_reg) ((_reg) & 0x003F) #define ICP10100_ID_REG 0x08 #define ICP10100_RESPONSE_WORD_LENGTH 3 #define ICP10100_CRC8_WORD_LENGTH 2 #define ICP10100_CRC8_POLYNOMIAL 0x31 #define ICP10100_CRC8_INIT 0xFF enum icp10100_mode { ICP10100_MODE_LP, /* Low power mode: 1x sampling */ ICP10100_MODE_N, /* Normal mode: 2x sampling */ ICP10100_MODE_LN, /* Low noise mode: 4x sampling */ ICP10100_MODE_ULN, /* Ultra low noise mode: 8x sampling */ ICP10100_MODE_NB, }; struct icp10100_state { struct mutex lock; struct i2c_client *client; struct regulator *vdd; enum icp10100_mode mode; int16_t cal[4]; }; struct icp10100_command { __be16 cmd; unsigned long wait_us; unsigned long wait_max_us; size_t response_word_nb; }; static const struct icp10100_command icp10100_cmd_soft_reset = { .cmd = cpu_to_be16(0x805D), .wait_us = 170, .wait_max_us = 200, .response_word_nb = 0, }; static const struct icp10100_command icp10100_cmd_read_id = { .cmd = cpu_to_be16(0xEFC8), .wait_us = 0, .response_word_nb = 1, }; static const struct icp10100_command icp10100_cmd_read_otp = { .cmd = cpu_to_be16(0xC7F7), .wait_us = 0, .response_word_nb = 1, }; static const struct icp10100_command icp10100_cmd_measure[] = { [ICP10100_MODE_LP] = { .cmd = cpu_to_be16(0x401A), .wait_us = 1800, .wait_max_us = 2000, .response_word_nb = 3, }, [ICP10100_MODE_N] = { .cmd = cpu_to_be16(0x48A3), .wait_us = 6300, .wait_max_us = 6500, .response_word_nb = 3, }, [ICP10100_MODE_LN] = { .cmd = cpu_to_be16(0x5059), .wait_us = 23800, .wait_max_us = 24000, .response_word_nb = 3, }, [ICP10100_MODE_ULN] = { .cmd = cpu_to_be16(0x58E0), .wait_us = 94500, .wait_max_us = 94700, .response_word_nb = 3, }, }; static const uint8_t icp10100_switch_mode_otp[] = {0xC5, 0x95, 0x00, 0x66, 0x9c}; DECLARE_CRC8_TABLE(icp10100_crc8_table); static inline int icp10100_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { int ret; ret = i2c_transfer(adap, msgs, num); if (ret < 0) return ret; if (ret != num) return -EIO; return 0; } static int icp10100_send_cmd(struct icp10100_state *st, const struct icp10100_command *cmd, __be16 *buf, size_t buf_len) { size_t size = cmd->response_word_nb * ICP10100_RESPONSE_WORD_LENGTH; uint8_t data[16]; uint8_t *ptr; uint8_t *buf_ptr = (uint8_t *)buf; struct i2c_msg msgs[2] = { { .addr = st->client->addr, .flags = 0, .len = 2, .buf = (uint8_t *)&cmd->cmd, }, { .addr = st->client->addr, .flags = I2C_M_RD, .len = size, .buf = data, }, }; uint8_t crc; unsigned int i; int ret; if (size > sizeof(data)) return -EINVAL; if (cmd->response_word_nb > 0 && (buf == NULL || buf_len < (cmd->response_word_nb * 2))) return -EINVAL; dev_dbg(&st->client->dev, "sending cmd %#x\n", be16_to_cpu(cmd->cmd)); if (cmd->response_word_nb > 0 && cmd->wait_us == 0) { /* direct command-response without waiting */ ret = icp10100_i2c_xfer(st->client->adapter, msgs, ARRAY_SIZE(msgs)); if (ret) return ret; } else { /* transfer command write */ ret = icp10100_i2c_xfer(st->client->adapter, &msgs[0], 1); if (ret) return ret; if (cmd->wait_us > 0) usleep_range(cmd->wait_us, cmd->wait_max_us); /* transfer response read if needed */ if (cmd->response_word_nb > 0) { ret = icp10100_i2c_xfer(st->client->adapter, &msgs[1], 1); if (ret) return ret; } else { return 0; } } /* process read words with crc checking */ for (i = 0; i < cmd->response_word_nb; ++i) { ptr = &data[i * ICP10100_RESPONSE_WORD_LENGTH]; crc = crc8(icp10100_crc8_table, ptr, ICP10100_CRC8_WORD_LENGTH, ICP10100_CRC8_INIT); if (crc != ptr[ICP10100_CRC8_WORD_LENGTH]) { dev_err(&st->client->dev, "crc error recv=%#x calc=%#x\n", ptr[ICP10100_CRC8_WORD_LENGTH], crc); return -EIO; } *buf_ptr++ = ptr[0]; *buf_ptr++ = ptr[1]; } return 0; } static int icp10100_read_cal_otp(struct icp10100_state *st) { __be16 val; int i; int ret; /* switch into OTP read mode */ ret = i2c_master_send(st->client, icp10100_switch_mode_otp, ARRAY_SIZE(icp10100_switch_mode_otp)); if (ret < 0) return ret; if (ret != ARRAY_SIZE(icp10100_switch_mode_otp)) return -EIO; /* read 4 calibration values */ for (i = 0; i < 4; ++i) { ret = icp10100_send_cmd(st, &icp10100_cmd_read_otp, &val, sizeof(val)); if (ret) return ret; st->cal[i] = be16_to_cpu(val); dev_dbg(&st->client->dev, "cal[%d] = %d\n", i, st->cal[i]); } return 0; } static int icp10100_init_chip(struct icp10100_state *st) { __be16 val; uint16_t id; int ret; /* read and check id */ ret = icp10100_send_cmd(st, &icp10100_cmd_read_id, &val, sizeof(val)); if (ret) return ret; id = ICP10100_ID_REG_GET(be16_to_cpu(val)); if (id != ICP10100_ID_REG) { dev_err(&st->client->dev, "invalid id %#x\n", id); return -ENODEV; } /* read calibration data from OTP */ ret = icp10100_read_cal_otp(st); if (ret) return ret; /* reset chip */ return icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0); } static int icp10100_get_measures(struct icp10100_state *st, uint32_t *pressure, uint16_t *temperature) { const struct icp10100_command *cmd; __be16 measures[3]; int ret; ret = pm_runtime_resume_and_get(&st->client->dev); if (ret < 0) return ret; mutex_lock(&st->lock); cmd = &icp10100_cmd_measure[st->mode]; ret = icp10100_send_cmd(st, cmd, measures, sizeof(measures)); mutex_unlock(&st->lock); if (ret) goto error_measure; *pressure = (be16_to_cpu(measures[0]) << 8) | (be16_to_cpu(measures[1]) >> 8); *temperature = be16_to_cpu(measures[2]); pm_runtime_mark_last_busy(&st->client->dev); error_measure: pm_runtime_put_autosuspend(&st->client->dev); return ret; } static uint32_t icp10100_get_pressure(struct icp10100_state *st, uint32_t raw_pressure, uint16_t raw_temp) { static int32_t p_calib[] = {45000, 80000, 105000}; static int32_t lut_lower = 3670016; static int32_t lut_upper = 12058624; static int32_t inv_quadr_factor = 16777216; static int32_t offset_factor = 2048; int64_t val1, val2; int32_t p_lut[3]; int32_t t, t_square; int64_t a, b, c; uint32_t pressure_mPa; dev_dbg(&st->client->dev, "raw: pressure = %u, temp = %u\n", raw_pressure, raw_temp); /* compute p_lut values */ t = (int32_t)raw_temp - 32768; t_square = t * t; val1 = (int64_t)st->cal[0] * (int64_t)t_square; p_lut[0] = lut_lower + (int32_t)div_s64(val1, inv_quadr_factor); val1 = (int64_t)st->cal[1] * (int64_t)t_square; p_lut[1] = offset_factor * st->cal[3] + (int32_t)div_s64(val1, inv_quadr_factor); val1 = (int64_t)st->cal[2] * (int64_t)t_square; p_lut[2] = lut_upper + (int32_t)div_s64(val1, inv_quadr_factor); dev_dbg(&st->client->dev, "p_lut = [%d, %d, %d]\n", p_lut[0], p_lut[1], p_lut[2]); /* compute a, b, c factors */ val1 = (int64_t)p_lut[0] * (int64_t)p_lut[1] * (int64_t)(p_calib[0] - p_calib[1]) + (int64_t)p_lut[1] * (int64_t)p_lut[2] * (int64_t)(p_calib[1] - p_calib[2]) + (int64_t)p_lut[2] * (int64_t)p_lut[0] * (int64_t)(p_calib[2] - p_calib[0]); val2 = (int64_t)p_lut[2] * (int64_t)(p_calib[0] - p_calib[1]) + (int64_t)p_lut[0] * (int64_t)(p_calib[1] - p_calib[2]) + (int64_t)p_lut[1] * (int64_t)(p_calib[2] - p_calib[0]); c = div64_s64(val1, val2); dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, c = %lld\n", val1, val2, c); val1 = (int64_t)p_calib[0] * (int64_t)p_lut[0] - (int64_t)p_calib[1] * (int64_t)p_lut[1] - (int64_t)(p_calib[1] - p_calib[0]) * c; val2 = (int64_t)p_lut[0] - (int64_t)p_lut[1]; a = div64_s64(val1, val2); dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, a = %lld\n", val1, val2, a); b = ((int64_t)p_calib[0] - a) * ((int64_t)p_lut[0] + c); dev_dbg(&st->client->dev, "b = %lld\n", b); /* * pressure_Pa = a + (b / (c + raw_pressure)) * pressure_mPa = 1000 * pressure_Pa */ pressure_mPa = 1000LL * a + div64_s64(1000LL * b, c + raw_pressure); return pressure_mPa; } static int icp10100_read_raw_measures(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2) { struct icp10100_state *st = iio_priv(indio_dev); uint32_t raw_pressure; uint16_t raw_temp; uint32_t pressure_mPa; int ret; ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; ret = icp10100_get_measures(st, &raw_pressure, &raw_temp); if (ret) goto error_release; switch (chan->type) { case IIO_PRESSURE: pressure_mPa = icp10100_get_pressure(st, raw_pressure, raw_temp); /* mPa to kPa */ *val = pressure_mPa / 1000000; *val2 = pressure_mPa % 1000000; ret = IIO_VAL_INT_PLUS_MICRO; break; case IIO_TEMP: *val = raw_temp; ret = IIO_VAL_INT; break; default: ret = -EINVAL; break; } error_release: iio_device_release_direct_mode(indio_dev); return ret; } static int icp10100_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct icp10100_state *st = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_PROCESSED: return icp10100_read_raw_measures(indio_dev, chan, val, val2); case IIO_CHAN_INFO_SCALE: switch (chan->type) { case IIO_TEMP: /* 1000 * 175°C / 65536 in m°C */ *val = 2; *val2 = 670288; return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } break; case IIO_CHAN_INFO_OFFSET: switch (chan->type) { case IIO_TEMP: /* 1000 * -45°C in m°C */ *val = -45000; return IIO_VAL_INT; default: return -EINVAL; } break; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: mutex_lock(&st->lock); *val = 1 << st->mode; mutex_unlock(&st->lock); return IIO_VAL_INT; default: return -EINVAL; } } static int icp10100_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { static int oversamplings[] = {1, 2, 4, 8}; switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *vals = oversamplings; *type = IIO_VAL_INT; *length = ARRAY_SIZE(oversamplings); return IIO_AVAIL_LIST; default: return -EINVAL; } } static int icp10100_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct icp10100_state *st = iio_priv(indio_dev); unsigned int mode; int ret; switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: /* oversampling is always positive and a power of 2 */ if (val <= 0 || !is_power_of_2(val)) return -EINVAL; mode = ilog2(val); if (mode >= ICP10100_MODE_NB) return -EINVAL; ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; mutex_lock(&st->lock); st->mode = mode; mutex_unlock(&st->lock); iio_device_release_direct_mode(indio_dev); return 0; default: return -EINVAL; } } static int icp10100_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, long mask) { switch (mask) { case IIO_CHAN_INFO_OVERSAMPLING_RATIO: return IIO_VAL_INT; default: return -EINVAL; } } static const struct iio_info icp10100_info = { .read_raw = icp10100_read_raw, .read_avail = icp10100_read_avail, .write_raw = icp10100_write_raw, .write_raw_get_fmt = icp10100_write_raw_get_fmt, }; static const struct iio_chan_spec icp10100_channels[] = { { .type = IIO_PRESSURE, .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), }, { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), }, }; static int icp10100_enable_regulator(struct icp10100_state *st) { int ret; ret = regulator_enable(st->vdd); if (ret) return ret; msleep(100); return 0; } static void icp10100_disable_regulator_action(void *data) { struct icp10100_state *st = data; int ret; ret = regulator_disable(st->vdd); if (ret) dev_err(&st->client->dev, "error %d disabling vdd\n", ret); } static void icp10100_pm_disable(void *data) { struct device *dev = data; pm_runtime_disable(dev); } static int icp10100_probe(struct i2c_client *client) { struct iio_dev *indio_dev; struct icp10100_state *st; int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "plain i2c transactions not supported\n"); return -ENODEV; } indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); if (!indio_dev) return -ENOMEM; i2c_set_clientdata(client, indio_dev); indio_dev->name = client->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = icp10100_channels; indio_dev->num_channels = ARRAY_SIZE(icp10100_channels); indio_dev->info = &icp10100_info; st = iio_priv(indio_dev); mutex_init(&st->lock); st->client = client; st->mode = ICP10100_MODE_N; st->vdd = devm_regulator_get(&client->dev, "vdd"); if (IS_ERR(st->vdd)) return PTR_ERR(st->vdd); ret = icp10100_enable_regulator(st); if (ret) return ret; ret = devm_add_action_or_reset(&client->dev, icp10100_disable_regulator_action, st); if (ret) return ret; /* has to be done before the first i2c communication */ crc8_populate_msb(icp10100_crc8_table, ICP10100_CRC8_POLYNOMIAL); ret = icp10100_init_chip(st); if (ret) { dev_err(&client->dev, "init chip error %d\n", ret); return ret; } /* enable runtime pm with autosuspend delay of 2s */ pm_runtime_get_noresume(&client->dev); pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); pm_runtime_set_autosuspend_delay(&client->dev, 2000); pm_runtime_use_autosuspend(&client->dev); pm_runtime_put(&client->dev); ret = devm_add_action_or_reset(&client->dev, icp10100_pm_disable, &client->dev); if (ret) return ret; return devm_iio_device_register(&client->dev, indio_dev); } static int icp10100_suspend(struct device *dev) { struct icp10100_state *st = iio_priv(dev_get_drvdata(dev)); int ret; mutex_lock(&st->lock); ret = regulator_disable(st->vdd); mutex_unlock(&st->lock); return ret; } static int icp10100_resume(struct device *dev) { struct icp10100_state *st = iio_priv(dev_get_drvdata(dev)); int ret; mutex_lock(&st->lock); ret = icp10100_enable_regulator(st); if (ret) goto out_unlock; /* reset chip */ ret = icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0); out_unlock: mutex_unlock(&st->lock); return ret; } static DEFINE_RUNTIME_DEV_PM_OPS(icp10100_pm, icp10100_suspend, icp10100_resume, NULL); static const struct of_device_id icp10100_of_match[] = { { .compatible = "invensense,icp10100", }, { } }; MODULE_DEVICE_TABLE(of, icp10100_of_match); static const struct i2c_device_id icp10100_id[] = { { "icp10100", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, icp10100_id); static struct i2c_driver icp10100_driver = { .driver = { .name = "icp10100", .pm = pm_ptr(&icp10100_pm), .of_match_table = icp10100_of_match, }, .probe = icp10100_probe, .id_table = icp10100_id, }; module_i2c_driver(icp10100_driver); MODULE_AUTHOR("InvenSense, Inc."); MODULE_DESCRIPTION("InvenSense icp10100 driver"); MODULE_LICENSE("GPL"); |