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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>4 * Copyright (c) 2012 Bosch Sensortec GmbH5 * Copyright (c) 2012 Unixphere AB6 * Copyright (c) 2014 Intel Corporation7 * Copyright (c) 2016 Linus Walleij <linus.walleij@linaro.org>8 *9 * Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.10 *11 * Datasheet:12 * https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf13 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf14 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf15 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf16 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp390-ds002.pdf17 * https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp581-ds004.pdf18 *19 * Notice:20 * The link to the bmp180 datasheet points to an outdated version missing these changes:21 * - Changed document referral from ANP015 to BST-MPS-AN004-00 on page 2622 * - Updated equation for B3 param on section 3.5 to ((((long)AC1 * 4 + X3) << oss) + 2) / 423 * - Updated RoHS directive to 2011/65/EU effective 8 June 2011 on page 2624 */25 26#define pr_fmt(fmt) "bmp280: " fmt27 28#include <linux/bitops.h>29#include <linux/bitfield.h>30#include <linux/cleanup.h>31#include <linux/completion.h>32#include <linux/delay.h>33#include <linux/device.h>34#include <linux/gpio/consumer.h>35#include <linux/interrupt.h>36#include <linux/irq.h> /* For irq_get_irq_data() */37#include <linux/module.h>38#include <linux/nvmem-provider.h>39#include <linux/pm_runtime.h>40#include <linux/random.h>41#include <linux/regmap.h>42#include <linux/regulator/consumer.h>43 44#include <linux/iio/buffer.h>45#include <linux/iio/iio.h>46#include <linux/iio/trigger_consumer.h>47#include <linux/iio/triggered_buffer.h>48 49#include <linux/unaligned.h>50 51#include "bmp280.h"52 53/*54 * These enums are used for indexing into the array of calibration55 * coefficients for BMP180.56 */57enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };58 59enum bmp380_odr {60 BMP380_ODR_200HZ,61 BMP380_ODR_100HZ,62 BMP380_ODR_50HZ,63 BMP380_ODR_25HZ,64 BMP380_ODR_12_5HZ,65 BMP380_ODR_6_25HZ,66 BMP380_ODR_3_125HZ,67 BMP380_ODR_1_5625HZ,68 BMP380_ODR_0_78HZ,69 BMP380_ODR_0_39HZ,70 BMP380_ODR_0_2HZ,71 BMP380_ODR_0_1HZ,72 BMP380_ODR_0_05HZ,73 BMP380_ODR_0_02HZ,74 BMP380_ODR_0_01HZ,75 BMP380_ODR_0_006HZ,76 BMP380_ODR_0_003HZ,77 BMP380_ODR_0_0015HZ,78};79 80enum bmp580_odr {81 BMP580_ODR_240HZ,82 BMP580_ODR_218HZ,83 BMP580_ODR_199HZ,84 BMP580_ODR_179HZ,85 BMP580_ODR_160HZ,86 BMP580_ODR_149HZ,87 BMP580_ODR_140HZ,88 BMP580_ODR_129HZ,89 BMP580_ODR_120HZ,90 BMP580_ODR_110HZ,91 BMP580_ODR_100HZ,92 BMP580_ODR_89HZ,93 BMP580_ODR_80HZ,94 BMP580_ODR_70HZ,95 BMP580_ODR_60HZ,96 BMP580_ODR_50HZ,97 BMP580_ODR_45HZ,98 BMP580_ODR_40HZ,99 BMP580_ODR_35HZ,100 BMP580_ODR_30HZ,101 BMP580_ODR_25HZ,102 BMP580_ODR_20HZ,103 BMP580_ODR_15HZ,104 BMP580_ODR_10HZ,105 BMP580_ODR_5HZ,106 BMP580_ODR_4HZ,107 BMP580_ODR_3HZ,108 BMP580_ODR_2HZ,109 BMP580_ODR_1HZ,110 BMP580_ODR_0_5HZ,111 BMP580_ODR_0_25HZ,112 BMP580_ODR_0_125HZ,113};114 115/*116 * These enums are used for indexing into the array of compensation117 * parameters for BMP280.118 */119enum { T1, T2, T3, P1, P2, P3, P4, P5, P6, P7, P8, P9 };120 121enum {122 /* Temperature calib indexes */123 BMP380_T1 = 0,124 BMP380_T2 = 2,125 BMP380_T3 = 4,126 /* Pressure calib indexes */127 BMP380_P1 = 5,128 BMP380_P2 = 7,129 BMP380_P3 = 9,130 BMP380_P4 = 10,131 BMP380_P5 = 11,132 BMP380_P6 = 13,133 BMP380_P7 = 15,134 BMP380_P8 = 16,135 BMP380_P9 = 17,136 BMP380_P10 = 19,137 BMP380_P11 = 20,138};139 140enum bmp280_scan {141 BMP280_PRESS,142 BMP280_TEMP,143 BME280_HUMID,144};145 146static const struct iio_chan_spec bmp280_channels[] = {147 {148 .type = IIO_PRESSURE,149 /* PROCESSED maintained for ABI backwards compatibility */150 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |151 BIT(IIO_CHAN_INFO_RAW) |152 BIT(IIO_CHAN_INFO_SCALE) |153 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),154 .scan_index = 0,155 .scan_type = {156 .sign = 'u',157 .realbits = 32,158 .storagebits = 32,159 .endianness = IIO_CPU,160 },161 },162 {163 .type = IIO_TEMP,164 /* PROCESSED maintained for ABI backwards compatibility */165 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |166 BIT(IIO_CHAN_INFO_RAW) |167 BIT(IIO_CHAN_INFO_SCALE) |168 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),169 .scan_index = 1,170 .scan_type = {171 .sign = 's',172 .realbits = 32,173 .storagebits = 32,174 .endianness = IIO_CPU,175 },176 },177 IIO_CHAN_SOFT_TIMESTAMP(2),178};179 180static const struct iio_chan_spec bme280_channels[] = {181 {182 .type = IIO_PRESSURE,183 /* PROCESSED maintained for ABI backwards compatibility */184 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |185 BIT(IIO_CHAN_INFO_RAW) |186 BIT(IIO_CHAN_INFO_SCALE) |187 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),188 .scan_index = 0,189 .scan_type = {190 .sign = 'u',191 .realbits = 32,192 .storagebits = 32,193 .endianness = IIO_CPU,194 },195 },196 {197 .type = IIO_TEMP,198 /* PROCESSED maintained for ABI backwards compatibility */199 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |200 BIT(IIO_CHAN_INFO_RAW) |201 BIT(IIO_CHAN_INFO_SCALE) |202 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),203 .scan_index = 1,204 .scan_type = {205 .sign = 's',206 .realbits = 32,207 .storagebits = 32,208 .endianness = IIO_CPU,209 },210 },211 {212 .type = IIO_HUMIDITYRELATIVE,213 /* PROCESSED maintained for ABI backwards compatibility */214 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |215 BIT(IIO_CHAN_INFO_RAW) |216 BIT(IIO_CHAN_INFO_SCALE) |217 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),218 .scan_index = 2,219 .scan_type = {220 .sign = 'u',221 .realbits = 32,222 .storagebits = 32,223 .endianness = IIO_CPU,224 },225 },226 IIO_CHAN_SOFT_TIMESTAMP(3),227};228 229static const struct iio_chan_spec bmp380_channels[] = {230 {231 .type = IIO_PRESSURE,232 /* PROCESSED maintained for ABI backwards compatibility */233 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |234 BIT(IIO_CHAN_INFO_RAW) |235 BIT(IIO_CHAN_INFO_SCALE) |236 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),237 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |238 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),239 .scan_index = 0,240 .scan_type = {241 .sign = 'u',242 .realbits = 32,243 .storagebits = 32,244 .endianness = IIO_CPU,245 },246 },247 {248 .type = IIO_TEMP,249 /* PROCESSED maintained for ABI backwards compatibility */250 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |251 BIT(IIO_CHAN_INFO_RAW) |252 BIT(IIO_CHAN_INFO_SCALE) |253 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),254 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |255 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),256 .scan_index = 1,257 .scan_type = {258 .sign = 's',259 .realbits = 32,260 .storagebits = 32,261 .endianness = IIO_CPU,262 },263 },264 IIO_CHAN_SOFT_TIMESTAMP(2),265};266 267static const struct iio_chan_spec bmp580_channels[] = {268 {269 .type = IIO_PRESSURE,270 /* PROCESSED maintained for ABI backwards compatibility */271 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |272 BIT(IIO_CHAN_INFO_RAW) |273 BIT(IIO_CHAN_INFO_SCALE) |274 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),275 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |276 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),277 .scan_index = 0,278 .scan_type = {279 .sign = 'u',280 .realbits = 24,281 .storagebits = 32,282 .endianness = IIO_LE,283 },284 },285 {286 .type = IIO_TEMP,287 /* PROCESSED maintained for ABI backwards compatibility */288 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |289 BIT(IIO_CHAN_INFO_RAW) |290 BIT(IIO_CHAN_INFO_SCALE) |291 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),292 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |293 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),294 .scan_index = 1,295 .scan_type = {296 .sign = 's',297 .realbits = 24,298 .storagebits = 32,299 .endianness = IIO_LE,300 },301 },302 IIO_CHAN_SOFT_TIMESTAMP(2),303};304 305static int bmp280_read_calib(struct bmp280_data *data)306{307 struct bmp280_calib *calib = &data->calib.bmp280;308 int ret;309 310 /* Read temperature and pressure calibration values. */311 ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,312 data->bmp280_cal_buf,313 sizeof(data->bmp280_cal_buf));314 if (ret) {315 dev_err(data->dev,316 "failed to read calibration parameters\n");317 return ret;318 }319 320 /* Toss calibration data into the entropy pool */321 add_device_randomness(data->bmp280_cal_buf,322 sizeof(data->bmp280_cal_buf));323 324 /* Parse temperature calibration values. */325 calib->T1 = le16_to_cpu(data->bmp280_cal_buf[T1]);326 calib->T2 = le16_to_cpu(data->bmp280_cal_buf[T2]);327 calib->T3 = le16_to_cpu(data->bmp280_cal_buf[T3]);328 329 /* Parse pressure calibration values. */330 calib->P1 = le16_to_cpu(data->bmp280_cal_buf[P1]);331 calib->P2 = le16_to_cpu(data->bmp280_cal_buf[P2]);332 calib->P3 = le16_to_cpu(data->bmp280_cal_buf[P3]);333 calib->P4 = le16_to_cpu(data->bmp280_cal_buf[P4]);334 calib->P5 = le16_to_cpu(data->bmp280_cal_buf[P5]);335 calib->P6 = le16_to_cpu(data->bmp280_cal_buf[P6]);336 calib->P7 = le16_to_cpu(data->bmp280_cal_buf[P7]);337 calib->P8 = le16_to_cpu(data->bmp280_cal_buf[P8]);338 calib->P9 = le16_to_cpu(data->bmp280_cal_buf[P9]);339 340 return 0;341}342 343static int bme280_read_calib(struct bmp280_data *data)344{345 struct bmp280_calib *calib = &data->calib.bmp280;346 struct device *dev = data->dev;347 unsigned int tmp;348 int ret;349 350 /* Load shared calibration params with bmp280 first */351 ret = bmp280_read_calib(data);352 if (ret)353 return ret;354 355 /*356 * Read humidity calibration values.357 * Due to some odd register addressing we cannot just358 * do a big bulk read. Instead, we have to read each Hx359 * value separately and sometimes do some bit shifting...360 * Humidity data is only available on BME280.361 */362 363 ret = regmap_read(data->regmap, BME280_REG_COMP_H1, &tmp);364 if (ret) {365 dev_err(dev, "failed to read H1 comp value\n");366 return ret;367 }368 calib->H1 = tmp;369 370 ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H2,371 &data->le16, sizeof(data->le16));372 if (ret) {373 dev_err(dev, "failed to read H2 comp value\n");374 return ret;375 }376 calib->H2 = sign_extend32(le16_to_cpu(data->le16), 15);377 378 ret = regmap_read(data->regmap, BME280_REG_COMP_H3, &tmp);379 if (ret) {380 dev_err(dev, "failed to read H3 comp value\n");381 return ret;382 }383 calib->H3 = tmp;384 385 ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H4,386 &data->be16, sizeof(data->be16));387 if (ret) {388 dev_err(dev, "failed to read H4 comp value\n");389 return ret;390 }391 calib->H4 = sign_extend32(((be16_to_cpu(data->be16) >> 4) & 0xff0) |392 (be16_to_cpu(data->be16) & 0xf), 11);393 394 ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H5,395 &data->le16, sizeof(data->le16));396 if (ret) {397 dev_err(dev, "failed to read H5 comp value\n");398 return ret;399 }400 calib->H5 = sign_extend32(FIELD_GET(BME280_COMP_H5_MASK, le16_to_cpu(data->le16)), 11);401 402 ret = regmap_read(data->regmap, BME280_REG_COMP_H6, &tmp);403 if (ret) {404 dev_err(dev, "failed to read H6 comp value\n");405 return ret;406 }407 calib->H6 = sign_extend32(tmp, 7);408 409 return 0;410}411 412static int bme280_read_humid_adc(struct bmp280_data *data, u16 *adc_humidity)413{414 u16 value_humidity;415 int ret;416 417 ret = regmap_bulk_read(data->regmap, BME280_REG_HUMIDITY_MSB,418 &data->be16, BME280_NUM_HUMIDITY_BYTES);419 if (ret) {420 dev_err(data->dev, "failed to read humidity\n");421 return ret;422 }423 424 value_humidity = be16_to_cpu(data->be16);425 if (value_humidity == BMP280_HUMIDITY_SKIPPED) {426 dev_err(data->dev, "reading humidity skipped\n");427 return -EIO;428 }429 *adc_humidity = value_humidity;430 431 return 0;432}433 434/*435 * Returns humidity in percent, resolution is 0.01 percent. Output value of436 * "47445" represents 47445/1024 = 46.333 %RH.437 *438 * Taken from BME280 datasheet, Section 4.2.3, "Compensation formula".439 */440static u32 bme280_compensate_humidity(struct bmp280_data *data,441 u16 adc_humidity, s32 t_fine)442{443 struct bmp280_calib *calib = &data->calib.bmp280;444 s32 var;445 446 var = t_fine - (s32)76800;447 var = (((((s32)adc_humidity << 14) - (calib->H4 << 20) - (calib->H5 * var))448 + (s32)16384) >> 15) * (((((((var * calib->H6) >> 10)449 * (((var * (s32)calib->H3) >> 11) + (s32)32768)) >> 10)450 + (s32)2097152) * calib->H2 + 8192) >> 14);451 var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)calib->H1) >> 4;452 453 var = clamp_val(var, 0, 419430400);454 455 return var >> 12;456}457 458static int bmp280_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)459{460 u32 value_temp;461 int ret;462 463 ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,464 data->buf, BMP280_NUM_TEMP_BYTES);465 if (ret) {466 dev_err(data->dev, "failed to read temperature\n");467 return ret;468 }469 470 value_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));471 if (value_temp == BMP280_TEMP_SKIPPED) {472 dev_err(data->dev, "reading temperature skipped\n");473 return -EIO;474 }475 *adc_temp = value_temp;476 477 return 0;478}479 480/*481 * Returns temperature in DegC, resolution is 0.01 DegC. Output value of482 * "5123" equals 51.23 DegC. t_fine carries fine temperature as global483 * value.484 *485 * Taken from datasheet, Section 3.11.3, "Compensation formula".486 */487static s32 bmp280_calc_t_fine(struct bmp280_data *data, u32 adc_temp)488{489 struct bmp280_calib *calib = &data->calib.bmp280;490 s32 var1, var2;491 492 var1 = (((((s32)adc_temp) >> 3) - ((s32)calib->T1 << 1)) *493 ((s32)calib->T2)) >> 11;494 var2 = (((((((s32)adc_temp) >> 4) - ((s32)calib->T1)) *495 ((((s32)adc_temp >> 4) - ((s32)calib->T1))) >> 12) *496 ((s32)calib->T3))) >> 14;497 return var1 + var2; /* t_fine = var1 + var2 */498}499 500static int bmp280_get_t_fine(struct bmp280_data *data, s32 *t_fine)501{502 u32 adc_temp;503 int ret;504 505 ret = bmp280_read_temp_adc(data, &adc_temp);506 if (ret)507 return ret;508 509 *t_fine = bmp280_calc_t_fine(data, adc_temp);510 511 return 0;512}513 514static s32 bmp280_compensate_temp(struct bmp280_data *data, u32 adc_temp)515{516 return (bmp280_calc_t_fine(data, adc_temp) * 5 + 128) / 256;517}518 519static int bmp280_read_press_adc(struct bmp280_data *data, u32 *adc_press)520{521 u32 value_press;522 int ret;523 524 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,525 data->buf, BMP280_NUM_PRESS_BYTES);526 if (ret) {527 dev_err(data->dev, "failed to read pressure\n");528 return ret;529 }530 531 value_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));532 if (value_press == BMP280_PRESS_SKIPPED) {533 dev_err(data->dev, "reading pressure skipped\n");534 return -EIO;535 }536 *adc_press = value_press;537 538 return 0;539}540 541/*542 * Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24543 * integer bits and 8 fractional bits). Output value of "24674867"544 * represents 24674867/256 = 96386.2 Pa = 963.862 hPa545 *546 * Taken from datasheet, Section 3.11.3, "Compensation formula".547 */548static u32 bmp280_compensate_press(struct bmp280_data *data,549 u32 adc_press, s32 t_fine)550{551 struct bmp280_calib *calib = &data->calib.bmp280;552 s64 var1, var2, p;553 554 var1 = ((s64)t_fine) - 128000;555 var2 = var1 * var1 * (s64)calib->P6;556 var2 += (var1 * (s64)calib->P5) << 17;557 var2 += ((s64)calib->P4) << 35;558 var1 = ((var1 * var1 * (s64)calib->P3) >> 8) +559 ((var1 * (s64)calib->P2) << 12);560 var1 = ((((s64)1) << 47) + var1) * ((s64)calib->P1) >> 33;561 562 if (var1 == 0)563 return 0;564 565 p = ((((s64)1048576 - (s32)adc_press) << 31) - var2) * 3125;566 p = div64_s64(p, var1);567 var1 = (((s64)calib->P9) * (p >> 13) * (p >> 13)) >> 25;568 var2 = ((s64)(calib->P8) * p) >> 19;569 p = ((p + var1 + var2) >> 8) + (((s64)calib->P7) << 4);570 571 return (u32)p;572}573 574static int bmp280_read_temp(struct bmp280_data *data, s32 *comp_temp)575{576 u32 adc_temp;577 int ret;578 579 ret = bmp280_read_temp_adc(data, &adc_temp);580 if (ret)581 return ret;582 583 *comp_temp = bmp280_compensate_temp(data, adc_temp);584 585 return 0;586}587 588static int bmp280_read_press(struct bmp280_data *data, u32 *comp_press)589{590 u32 adc_press;591 s32 t_fine;592 int ret;593 594 ret = bmp280_get_t_fine(data, &t_fine);595 if (ret)596 return ret;597 598 ret = bmp280_read_press_adc(data, &adc_press);599 if (ret)600 return ret;601 602 *comp_press = bmp280_compensate_press(data, adc_press, t_fine);603 604 return 0;605}606 607static int bme280_read_humid(struct bmp280_data *data, u32 *comp_humidity)608{609 u16 adc_humidity;610 s32 t_fine;611 int ret;612 613 ret = bmp280_get_t_fine(data, &t_fine);614 if (ret)615 return ret;616 617 ret = bme280_read_humid_adc(data, &adc_humidity);618 if (ret)619 return ret;620 621 *comp_humidity = bme280_compensate_humidity(data, adc_humidity, t_fine);622 623 return 0;624}625 626static int bmp280_read_raw_impl(struct iio_dev *indio_dev,627 struct iio_chan_spec const *chan,628 int *val, int *val2, long mask)629{630 struct bmp280_data *data = iio_priv(indio_dev);631 int chan_value;632 int ret;633 634 guard(mutex)(&data->lock);635 636 switch (mask) {637 case IIO_CHAN_INFO_PROCESSED:638 switch (chan->type) {639 case IIO_HUMIDITYRELATIVE:640 ret = data->chip_info->read_humid(data, &chan_value);641 if (ret)642 return ret;643 644 *val = data->chip_info->humid_coeffs[0] * chan_value;645 *val2 = data->chip_info->humid_coeffs[1];646 return data->chip_info->humid_coeffs_type;647 case IIO_PRESSURE:648 ret = data->chip_info->read_press(data, &chan_value);649 if (ret)650 return ret;651 652 *val = data->chip_info->press_coeffs[0] * chan_value;653 *val2 = data->chip_info->press_coeffs[1];654 return data->chip_info->press_coeffs_type;655 case IIO_TEMP:656 ret = data->chip_info->read_temp(data, &chan_value);657 if (ret)658 return ret;659 660 *val = data->chip_info->temp_coeffs[0] * chan_value;661 *val2 = data->chip_info->temp_coeffs[1];662 return data->chip_info->temp_coeffs_type;663 default:664 return -EINVAL;665 }666 case IIO_CHAN_INFO_RAW:667 switch (chan->type) {668 case IIO_HUMIDITYRELATIVE:669 ret = data->chip_info->read_humid(data, &chan_value);670 if (ret)671 return ret;672 673 *val = chan_value;674 return IIO_VAL_INT;675 case IIO_PRESSURE:676 ret = data->chip_info->read_press(data, &chan_value);677 if (ret)678 return ret;679 680 *val = chan_value;681 return IIO_VAL_INT;682 case IIO_TEMP:683 ret = data->chip_info->read_temp(data, &chan_value);684 if (ret)685 return ret;686 687 *val = chan_value;688 return IIO_VAL_INT;689 default:690 return -EINVAL;691 }692 case IIO_CHAN_INFO_SCALE:693 switch (chan->type) {694 case IIO_HUMIDITYRELATIVE:695 *val = data->chip_info->humid_coeffs[0];696 *val2 = data->chip_info->humid_coeffs[1];697 return data->chip_info->humid_coeffs_type;698 case IIO_PRESSURE:699 *val = data->chip_info->press_coeffs[0];700 *val2 = data->chip_info->press_coeffs[1];701 return data->chip_info->press_coeffs_type;702 case IIO_TEMP:703 *val = data->chip_info->temp_coeffs[0];704 *val2 = data->chip_info->temp_coeffs[1];705 return data->chip_info->temp_coeffs_type;706 default:707 return -EINVAL;708 }709 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:710 switch (chan->type) {711 case IIO_HUMIDITYRELATIVE:712 *val = 1 << data->oversampling_humid;713 return IIO_VAL_INT;714 case IIO_PRESSURE:715 *val = 1 << data->oversampling_press;716 return IIO_VAL_INT;717 case IIO_TEMP:718 *val = 1 << data->oversampling_temp;719 return IIO_VAL_INT;720 default:721 return -EINVAL;722 }723 case IIO_CHAN_INFO_SAMP_FREQ:724 if (!data->chip_info->sampling_freq_avail)725 return -EINVAL;726 727 *val = data->chip_info->sampling_freq_avail[data->sampling_freq][0];728 *val2 = data->chip_info->sampling_freq_avail[data->sampling_freq][1];729 return IIO_VAL_INT_PLUS_MICRO;730 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:731 if (!data->chip_info->iir_filter_coeffs_avail)732 return -EINVAL;733 734 *val = (1 << data->iir_filter_coeff) - 1;735 return IIO_VAL_INT;736 default:737 return -EINVAL;738 }739}740 741static int bmp280_read_raw(struct iio_dev *indio_dev,742 struct iio_chan_spec const *chan,743 int *val, int *val2, long mask)744{745 struct bmp280_data *data = iio_priv(indio_dev);746 int ret;747 748 pm_runtime_get_sync(data->dev);749 ret = bmp280_read_raw_impl(indio_dev, chan, val, val2, mask);750 pm_runtime_mark_last_busy(data->dev);751 pm_runtime_put_autosuspend(data->dev);752 753 return ret;754}755 756static int bme280_write_oversampling_ratio_humid(struct bmp280_data *data,757 int val)758{759 const int *avail = data->chip_info->oversampling_humid_avail;760 const int n = data->chip_info->num_oversampling_humid_avail;761 int ret, prev;762 int i;763 764 for (i = 0; i < n; i++) {765 if (avail[i] == val) {766 prev = data->oversampling_humid;767 data->oversampling_humid = ilog2(val);768 769 ret = data->chip_info->chip_config(data);770 if (ret) {771 data->oversampling_humid = prev;772 data->chip_info->chip_config(data);773 return ret;774 }775 return 0;776 }777 }778 return -EINVAL;779}780 781static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,782 int val)783{784 const int *avail = data->chip_info->oversampling_temp_avail;785 const int n = data->chip_info->num_oversampling_temp_avail;786 int ret, prev;787 int i;788 789 for (i = 0; i < n; i++) {790 if (avail[i] == val) {791 prev = data->oversampling_temp;792 data->oversampling_temp = ilog2(val);793 794 ret = data->chip_info->chip_config(data);795 if (ret) {796 data->oversampling_temp = prev;797 data->chip_info->chip_config(data);798 return ret;799 }800 return 0;801 }802 }803 return -EINVAL;804}805 806static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,807 int val)808{809 const int *avail = data->chip_info->oversampling_press_avail;810 const int n = data->chip_info->num_oversampling_press_avail;811 int ret, prev;812 int i;813 814 for (i = 0; i < n; i++) {815 if (avail[i] == val) {816 prev = data->oversampling_press;817 data->oversampling_press = ilog2(val);818 819 ret = data->chip_info->chip_config(data);820 if (ret) {821 data->oversampling_press = prev;822 data->chip_info->chip_config(data);823 return ret;824 }825 return 0;826 }827 }828 return -EINVAL;829}830 831static int bmp280_write_sampling_frequency(struct bmp280_data *data,832 int val, int val2)833{834 const int (*avail)[2] = data->chip_info->sampling_freq_avail;835 const int n = data->chip_info->num_sampling_freq_avail;836 int ret, prev;837 int i;838 839 for (i = 0; i < n; i++) {840 if (avail[i][0] == val && avail[i][1] == val2) {841 prev = data->sampling_freq;842 data->sampling_freq = i;843 844 ret = data->chip_info->chip_config(data);845 if (ret) {846 data->sampling_freq = prev;847 data->chip_info->chip_config(data);848 return ret;849 }850 return 0;851 }852 }853 return -EINVAL;854}855 856static int bmp280_write_iir_filter_coeffs(struct bmp280_data *data, int val)857{858 const int *avail = data->chip_info->iir_filter_coeffs_avail;859 const int n = data->chip_info->num_iir_filter_coeffs_avail;860 int ret, prev;861 int i;862 863 for (i = 0; i < n; i++) {864 if (avail[i] - 1 == val) {865 prev = data->iir_filter_coeff;866 data->iir_filter_coeff = i;867 868 ret = data->chip_info->chip_config(data);869 if (ret) {870 data->iir_filter_coeff = prev;871 data->chip_info->chip_config(data);872 return ret;873 874 }875 return 0;876 }877 }878 return -EINVAL;879}880 881static int bmp280_write_raw_impl(struct iio_dev *indio_dev,882 struct iio_chan_spec const *chan,883 int val, int val2, long mask)884{885 struct bmp280_data *data = iio_priv(indio_dev);886 887 guard(mutex)(&data->lock);888 889 /*890 * Helper functions to update sensor running configuration.891 * If an error happens applying new settings, will try restore892 * previous parameters to ensure the sensor is left in a known893 * working configuration.894 */895 switch (mask) {896 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:897 switch (chan->type) {898 case IIO_HUMIDITYRELATIVE:899 return bme280_write_oversampling_ratio_humid(data, val);900 case IIO_PRESSURE:901 return bmp280_write_oversampling_ratio_press(data, val);902 case IIO_TEMP:903 return bmp280_write_oversampling_ratio_temp(data, val);904 default:905 return -EINVAL;906 }907 case IIO_CHAN_INFO_SAMP_FREQ:908 return bmp280_write_sampling_frequency(data, val, val2);909 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:910 return bmp280_write_iir_filter_coeffs(data, val);911 default:912 return -EINVAL;913 }914}915 916static int bmp280_write_raw(struct iio_dev *indio_dev,917 struct iio_chan_spec const *chan,918 int val, int val2, long mask)919{920 struct bmp280_data *data = iio_priv(indio_dev);921 int ret;922 923 pm_runtime_get_sync(data->dev);924 ret = bmp280_write_raw_impl(indio_dev, chan, val, val2, mask);925 pm_runtime_mark_last_busy(data->dev);926 pm_runtime_put_autosuspend(data->dev);927 928 return ret;929}930 931static int bmp280_read_avail(struct iio_dev *indio_dev,932 struct iio_chan_spec const *chan,933 const int **vals, int *type, int *length,934 long mask)935{936 struct bmp280_data *data = iio_priv(indio_dev);937 938 switch (mask) {939 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:940 switch (chan->type) {941 case IIO_PRESSURE:942 *vals = data->chip_info->oversampling_press_avail;943 *length = data->chip_info->num_oversampling_press_avail;944 break;945 case IIO_TEMP:946 *vals = data->chip_info->oversampling_temp_avail;947 *length = data->chip_info->num_oversampling_temp_avail;948 break;949 default:950 return -EINVAL;951 }952 *type = IIO_VAL_INT;953 return IIO_AVAIL_LIST;954 case IIO_CHAN_INFO_SAMP_FREQ:955 *vals = (const int *)data->chip_info->sampling_freq_avail;956 *type = IIO_VAL_INT_PLUS_MICRO;957 /* Values are stored in a 2D matrix */958 *length = data->chip_info->num_sampling_freq_avail;959 return IIO_AVAIL_LIST;960 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:961 *vals = data->chip_info->iir_filter_coeffs_avail;962 *type = IIO_VAL_INT;963 *length = data->chip_info->num_iir_filter_coeffs_avail;964 return IIO_AVAIL_LIST;965 default:966 return -EINVAL;967 }968}969 970static const struct iio_info bmp280_info = {971 .read_raw = &bmp280_read_raw,972 .read_avail = &bmp280_read_avail,973 .write_raw = &bmp280_write_raw,974};975 976static const unsigned long bmp280_avail_scan_masks[] = {977 BIT(BMP280_TEMP) | BIT(BMP280_PRESS),978 0979};980 981static const unsigned long bme280_avail_scan_masks[] = {982 BIT(BME280_HUMID) | BIT(BMP280_TEMP) | BIT(BMP280_PRESS),983 0984};985 986static int bmp280_chip_config(struct bmp280_data *data)987{988 u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |989 FIELD_PREP(BMP280_OSRS_PRESS_MASK, data->oversampling_press + 1);990 int ret;991 992 ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,993 BMP280_OSRS_TEMP_MASK |994 BMP280_OSRS_PRESS_MASK |995 BMP280_MODE_MASK,996 osrs | BMP280_MODE_NORMAL);997 if (ret) {998 dev_err(data->dev, "failed to write ctrl_meas register\n");999 return ret;1000 }1001 1002 ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG,1003 BMP280_FILTER_MASK,1004 BMP280_FILTER_4X);1005 if (ret) {1006 dev_err(data->dev, "failed to write config register\n");1007 return ret;1008 }1009 1010 return ret;1011}1012 1013static irqreturn_t bmp280_trigger_handler(int irq, void *p)1014{1015 struct iio_poll_func *pf = p;1016 struct iio_dev *indio_dev = pf->indio_dev;1017 struct bmp280_data *data = iio_priv(indio_dev);1018 s32 adc_temp, adc_press, t_fine;1019 int ret;1020 1021 guard(mutex)(&data->lock);1022 1023 /* Burst read data registers */1024 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,1025 data->buf, BMP280_BURST_READ_BYTES);1026 if (ret) {1027 dev_err(data->dev, "failed to burst read sensor data\n");1028 goto out;1029 }1030 1031 /* Temperature calculations */1032 adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[3]));1033 if (adc_temp == BMP280_TEMP_SKIPPED) {1034 dev_err(data->dev, "reading temperature skipped\n");1035 goto out;1036 }1037 1038 data->sensor_data[1] = bmp280_compensate_temp(data, adc_temp);1039 1040 /* Pressure calculations */1041 adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0]));1042 if (adc_press == BMP280_PRESS_SKIPPED) {1043 dev_err(data->dev, "reading pressure skipped\n");1044 goto out;1045 }1046 1047 t_fine = bmp280_calc_t_fine(data, adc_temp);1048 1049 data->sensor_data[0] = bmp280_compensate_press(data, adc_press, t_fine);1050 1051 iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,1052 iio_get_time_ns(indio_dev));1053 1054out:1055 iio_trigger_notify_done(indio_dev->trig);1056 1057 return IRQ_HANDLED;1058}1059 1060static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };1061static const u8 bmp280_chip_ids[] = { BMP280_CHIP_ID };1062static const int bmp280_temp_coeffs[] = { 10, 1 };1063static const int bmp280_press_coeffs[] = { 1, 256000 };1064 1065const struct bmp280_chip_info bmp280_chip_info = {1066 .id_reg = BMP280_REG_ID,1067 .chip_id = bmp280_chip_ids,1068 .num_chip_id = ARRAY_SIZE(bmp280_chip_ids),1069 .regmap_config = &bmp280_regmap_config,1070 .start_up_time = 2000,1071 .channels = bmp280_channels,1072 .num_channels = ARRAY_SIZE(bmp280_channels),1073 .avail_scan_masks = bmp280_avail_scan_masks,1074 1075 .oversampling_temp_avail = bmp280_oversampling_avail,1076 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),1077 /*1078 * Oversampling config values on BMx280 have one additional setting1079 * that other generations of the family don't:1080 * The value 0 means the measurement is bypassed instead of1081 * oversampling set to x1.1082 *1083 * To account for this difference, and preserve the same common1084 * config logic, this is handled later on chip_config callback1085 * incrementing one unit the oversampling setting.1086 */1087 .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,1088 1089 .oversampling_press_avail = bmp280_oversampling_avail,1090 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),1091 .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,1092 1093 .temp_coeffs = bmp280_temp_coeffs,1094 .temp_coeffs_type = IIO_VAL_FRACTIONAL,1095 .press_coeffs = bmp280_press_coeffs,1096 .press_coeffs_type = IIO_VAL_FRACTIONAL,1097 1098 .chip_config = bmp280_chip_config,1099 .read_temp = bmp280_read_temp,1100 .read_press = bmp280_read_press,1101 .read_calib = bmp280_read_calib,1102 1103 .trigger_handler = bmp280_trigger_handler,1104};1105EXPORT_SYMBOL_NS(bmp280_chip_info, IIO_BMP280);1106 1107static int bme280_chip_config(struct bmp280_data *data)1108{1109 u8 osrs = FIELD_PREP(BME280_OSRS_HUMIDITY_MASK, data->oversampling_humid + 1);1110 int ret;1111 1112 /*1113 * Oversampling of humidity must be set before oversampling of1114 * temperature/pressure is set to become effective.1115 */1116 ret = regmap_update_bits(data->regmap, BME280_REG_CTRL_HUMIDITY,1117 BME280_OSRS_HUMIDITY_MASK, osrs);1118 if (ret) {1119 dev_err(data->dev, "failed to set humidity oversampling");1120 return ret;1121 }1122 1123 return bmp280_chip_config(data);1124}1125 1126static irqreturn_t bme280_trigger_handler(int irq, void *p)1127{1128 struct iio_poll_func *pf = p;1129 struct iio_dev *indio_dev = pf->indio_dev;1130 struct bmp280_data *data = iio_priv(indio_dev);1131 s32 adc_temp, adc_press, adc_humidity, t_fine;1132 int ret;1133 1134 guard(mutex)(&data->lock);1135 1136 /* Burst read data registers */1137 ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,1138 data->buf, BME280_BURST_READ_BYTES);1139 if (ret) {1140 dev_err(data->dev, "failed to burst read sensor data\n");1141 goto out;1142 }1143 1144 /* Temperature calculations */1145 adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[3]));1146 if (adc_temp == BMP280_TEMP_SKIPPED) {1147 dev_err(data->dev, "reading temperature skipped\n");1148 goto out;1149 }1150 1151 data->sensor_data[1] = bmp280_compensate_temp(data, adc_temp);1152 1153 /* Pressure calculations */1154 adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0]));1155 if (adc_press == BMP280_PRESS_SKIPPED) {1156 dev_err(data->dev, "reading pressure skipped\n");1157 goto out;1158 }1159 1160 t_fine = bmp280_calc_t_fine(data, adc_temp);1161 1162 data->sensor_data[0] = bmp280_compensate_press(data, adc_press, t_fine);1163 1164 /* Humidity calculations */1165 adc_humidity = get_unaligned_be16(&data->buf[6]);1166 1167 if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {1168 dev_err(data->dev, "reading humidity skipped\n");1169 goto out;1170 }1171 data->sensor_data[2] = bme280_compensate_humidity(data, adc_humidity, t_fine);1172 1173 iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,1174 iio_get_time_ns(indio_dev));1175 1176out:1177 iio_trigger_notify_done(indio_dev->trig);1178 1179 return IRQ_HANDLED;1180}1181 1182static const u8 bme280_chip_ids[] = { BME280_CHIP_ID };1183static const int bme280_humid_coeffs[] = { 1000, 1024 };1184 1185const struct bmp280_chip_info bme280_chip_info = {1186 .id_reg = BMP280_REG_ID,1187 .chip_id = bme280_chip_ids,1188 .num_chip_id = ARRAY_SIZE(bme280_chip_ids),1189 .regmap_config = &bme280_regmap_config,1190 .start_up_time = 2000,1191 .channels = bme280_channels,1192 .num_channels = ARRAY_SIZE(bme280_channels),1193 .avail_scan_masks = bme280_avail_scan_masks,1194 1195 .oversampling_temp_avail = bmp280_oversampling_avail,1196 .num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),1197 .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,1198 1199 .oversampling_press_avail = bmp280_oversampling_avail,1200 .num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),1201 .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,1202 1203 .oversampling_humid_avail = bmp280_oversampling_avail,1204 .num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),1205 .oversampling_humid_default = BME280_OSRS_HUMIDITY_16X - 1,1206 1207 .temp_coeffs = bmp280_temp_coeffs,1208 .temp_coeffs_type = IIO_VAL_FRACTIONAL,1209 .press_coeffs = bmp280_press_coeffs,1210 .press_coeffs_type = IIO_VAL_FRACTIONAL,1211 .humid_coeffs = bme280_humid_coeffs,1212 .humid_coeffs_type = IIO_VAL_FRACTIONAL,1213 1214 .chip_config = bme280_chip_config,1215 .read_temp = bmp280_read_temp,1216 .read_press = bmp280_read_press,1217 .read_humid = bme280_read_humid,1218 .read_calib = bme280_read_calib,1219 1220 .trigger_handler = bme280_trigger_handler,1221};1222EXPORT_SYMBOL_NS(bme280_chip_info, IIO_BMP280);1223 1224/*1225 * Helper function to send a command to BMP3XX sensors.1226 *1227 * Sensor processes commands written to the CMD register and signals1228 * execution result through "cmd_rdy" and "cmd_error" flags available on1229 * STATUS and ERROR registers.1230 */1231static int bmp380_cmd(struct bmp280_data *data, u8 cmd)1232{1233 unsigned int reg;1234 int ret;1235 1236 /* Check if device is ready to process a command */1237 ret = regmap_read(data->regmap, BMP380_REG_STATUS, ®);1238 if (ret) {1239 dev_err(data->dev, "failed to read error register\n");1240 return ret;1241 }1242 if (!(reg & BMP380_STATUS_CMD_RDY_MASK)) {1243 dev_err(data->dev, "device is not ready to accept commands\n");1244 return -EBUSY;1245 }1246 1247 /* Send command to process */1248 ret = regmap_write(data->regmap, BMP380_REG_CMD, cmd);1249 if (ret) {1250 dev_err(data->dev, "failed to send command to device\n");1251 return ret;1252 }1253 /* Wait for 2ms for command to be processed */1254 usleep_range(data->start_up_time, data->start_up_time + 100);1255 /* Check for command processing error */1256 ret = regmap_read(data->regmap, BMP380_REG_ERROR, ®);1257 if (ret) {1258 dev_err(data->dev, "error reading ERROR reg\n");1259 return ret;1260 }1261 if (reg & BMP380_ERR_CMD_MASK) {1262 dev_err(data->dev, "error processing command 0x%X\n", cmd);1263 return -EINVAL;1264 }1265 1266 return 0;1267}1268 1269static int bmp380_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)1270{1271 u32 value_temp;1272 int ret;1273 1274 ret = regmap_bulk_read(data->regmap, BMP380_REG_TEMP_XLSB,1275 data->buf, BMP280_NUM_TEMP_BYTES);1276 if (ret) {1277 dev_err(data->dev, "failed to read temperature\n");1278 return ret;1279 }1280 1281 value_temp = get_unaligned_le24(data->buf);1282 if (value_temp == BMP380_TEMP_SKIPPED) {1283 dev_err(data->dev, "reading temperature skipped\n");1284 return -EIO;1285 }1286 *adc_temp = value_temp;1287 1288 return 0;1289}1290 1291/*1292 * Returns temperature in Celsius degrees, resolution is 0.01º C. Output value1293 * of "5123" equals 51.2º C. t_fine carries fine temperature as global value.1294 *1295 * Taken from datasheet, Section Appendix 9, "Compensation formula" and repo1296 * https://github.com/BoschSensortec/BMP3-Sensor-API.1297 */1298static s32 bmp380_calc_t_fine(struct bmp280_data *data, u32 adc_temp)1299{1300 s64 var1, var2, var3, var4, var5, var6;1301 struct bmp380_calib *calib = &data->calib.bmp380;1302 1303 var1 = ((s64) adc_temp) - (((s64) calib->T1) << 8);1304 var2 = var1 * ((s64) calib->T2);1305 var3 = var1 * var1;1306 var4 = var3 * ((s64) calib->T3);1307 var5 = (var2 << 18) + var4;1308 var6 = var5 >> 32;1309 return (s32)var6; /* t_fine = var6 */1310}1311 1312static int bmp380_get_t_fine(struct bmp280_data *data, s32 *t_fine)1313{1314 s32 adc_temp;1315 int ret;1316 1317 ret = bmp380_read_temp_adc(data, &adc_temp);1318 if (ret)1319 return ret;1320 1321 *t_fine = bmp380_calc_t_fine(data, adc_temp);1322 1323 return 0;1324}1325 1326static int bmp380_compensate_temp(struct bmp280_data *data, u32 adc_temp)1327{1328 s64 comp_temp;1329 s32 var6;1330 1331 var6 = bmp380_calc_t_fine(data, adc_temp);1332 comp_temp = (var6 * 25) >> 14;1333 1334 comp_temp = clamp_val(comp_temp, BMP380_MIN_TEMP, BMP380_MAX_TEMP);1335 return (s32) comp_temp;1336}1337 1338static int bmp380_read_press_adc(struct bmp280_data *data, u32 *adc_press)1339{1340 u32 value_press;1341 int ret;1342 1343 ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,1344 data->buf, BMP280_NUM_PRESS_BYTES);1345 if (ret) {1346 dev_err(data->dev, "failed to read pressure\n");1347 return ret;1348 }1349 1350 value_press = get_unaligned_le24(data->buf);1351 if (value_press == BMP380_PRESS_SKIPPED) {1352 dev_err(data->dev, "reading pressure skipped\n");1353 return -EIO;1354 }1355 *adc_press = value_press;1356 1357 return 0;1358}1359 1360/*1361 * Returns pressure in Pa as an unsigned 32 bit integer in fractional Pascal.1362 * Output value of "9528709" represents 9528709/100 = 95287.09 Pa = 952.8709 hPa.1363 *1364 * Taken from datasheet, Section 9.3. "Pressure compensation" and repository1365 * https://github.com/BoschSensortec/BMP3-Sensor-API.1366 */1367static u32 bmp380_compensate_press(struct bmp280_data *data,1368 u32 adc_press, s32 t_fine)1369{1370 s64 var1, var2, var3, var4, var5, var6, offset, sensitivity;1371 struct bmp380_calib *calib = &data->calib.bmp380;1372 u32 comp_press;1373 1374 var1 = (s64)t_fine * (s64)t_fine;1375 var2 = var1 >> 6;1376 var3 = (var2 * ((s64)t_fine)) >> 8;1377 var4 = ((s64)calib->P8 * var3) >> 5;1378 var5 = ((s64)calib->P7 * var1) << 4;1379 var6 = ((s64)calib->P6 * (s64)t_fine) << 22;1380 offset = ((s64)calib->P5 << 47) + var4 + var5 + var6;1381 var2 = ((s64)calib->P4 * var3) >> 5;1382 var4 = ((s64)calib->P3 * var1) << 2;1383 var5 = ((s64)calib->P2 - ((s64)1 << 14)) *1384 ((s64)t_fine << 21);1385 sensitivity = (((s64) calib->P1 - ((s64) 1 << 14)) << 46) +1386 var2 + var4 + var5;1387 var1 = (sensitivity >> 24) * (s64)adc_press;1388 var2 = (s64)calib->P10 * (s64)t_fine;1389 var3 = var2 + ((s64)calib->P9 << 16);1390 var4 = (var3 * (s64)adc_press) >> 13;1391 1392 /*1393 * Dividing by 10 followed by multiplying by 10 to avoid1394 * possible overflow caused by (uncomp_data->pressure * partial_data4).1395 */1396 var5 = ((s64)adc_press * div_s64(var4, 10)) >> 9;1397 var5 *= 10;1398 var6 = (s64)adc_press * (s64)adc_press;1399 var2 = ((s64)calib->P11 * var6) >> 16;1400 var3 = (var2 * (s64)adc_press) >> 7;1401 var4 = (offset >> 2) + var1 + var5 + var3;1402 comp_press = ((u64)var4 * 25) >> 40;1403 1404 comp_press = clamp_val(comp_press, BMP380_MIN_PRES, BMP380_MAX_PRES);1405 return comp_press;1406}1407 1408static int bmp380_read_temp(struct bmp280_data *data, s32 *comp_temp)1409{1410 u32 adc_temp;1411 int ret;1412 1413 ret = bmp380_read_temp_adc(data, &adc_temp);1414 if (ret)1415 return ret;1416 1417 *comp_temp = bmp380_compensate_temp(data, adc_temp);1418 1419 return 0;1420}1421 1422static int bmp380_read_press(struct bmp280_data *data, u32 *comp_press)1423{1424 u32 adc_press, t_fine;1425 int ret;1426 1427 ret = bmp380_get_t_fine(data, &t_fine);1428 if (ret)1429 return ret;1430 1431 ret = bmp380_read_press_adc(data, &adc_press);1432 if (ret)1433 return ret;1434 1435 *comp_press = bmp380_compensate_press(data, adc_press, t_fine);1436 1437 return 0;1438}1439 1440static int bmp380_read_calib(struct bmp280_data *data)1441{1442 struct bmp380_calib *calib = &data->calib.bmp380;1443 int ret;1444 1445 /* Read temperature and pressure calibration data */1446 ret = regmap_bulk_read(data->regmap, BMP380_REG_CALIB_TEMP_START,1447 data->bmp380_cal_buf,1448 sizeof(data->bmp380_cal_buf));1449 if (ret) {1450 dev_err(data->dev,1451 "failed to read calibration parameters\n");1452 return ret;1453 }1454 1455 /* Toss the temperature calibration data into the entropy pool */1456 add_device_randomness(data->bmp380_cal_buf,1457 sizeof(data->bmp380_cal_buf));1458 1459 /* Parse calibration values */1460 calib->T1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T1]);1461 calib->T2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T2]);1462 calib->T3 = data->bmp380_cal_buf[BMP380_T3];1463 calib->P1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P1]);1464 calib->P2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P2]);1465 calib->P3 = data->bmp380_cal_buf[BMP380_P3];1466 calib->P4 = data->bmp380_cal_buf[BMP380_P4];1467 calib->P5 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P5]);1468 calib->P6 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P6]);1469 calib->P7 = data->bmp380_cal_buf[BMP380_P7];1470 calib->P8 = data->bmp380_cal_buf[BMP380_P8];1471 calib->P9 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P9]);1472 calib->P10 = data->bmp380_cal_buf[BMP380_P10];1473 calib->P11 = data->bmp380_cal_buf[BMP380_P11];1474 1475 return 0;1476}1477 1478static const int bmp380_odr_table[][2] = {1479 [BMP380_ODR_200HZ] = {200, 0},1480 [BMP380_ODR_100HZ] = {100, 0},1481 [BMP380_ODR_50HZ] = {50, 0},1482 [BMP380_ODR_25HZ] = {25, 0},1483 [BMP380_ODR_12_5HZ] = {12, 500000},1484 [BMP380_ODR_6_25HZ] = {6, 250000},1485 [BMP380_ODR_3_125HZ] = {3, 125000},1486 [BMP380_ODR_1_5625HZ] = {1, 562500},1487 [BMP380_ODR_0_78HZ] = {0, 781250},1488 [BMP380_ODR_0_39HZ] = {0, 390625},1489 [BMP380_ODR_0_2HZ] = {0, 195313},1490 [BMP380_ODR_0_1HZ] = {0, 97656},1491 [BMP380_ODR_0_05HZ] = {0, 48828},1492 [BMP380_ODR_0_02HZ] = {0, 24414},1493 [BMP380_ODR_0_01HZ] = {0, 12207},1494 [BMP380_ODR_0_006HZ] = {0, 6104},1495 [BMP380_ODR_0_003HZ] = {0, 3052},1496 [BMP380_ODR_0_0015HZ] = {0, 1526},1497};1498 1499static int bmp380_preinit(struct bmp280_data *data)1500{1501 /* BMP3xx requires soft-reset as part of initialization */1502 return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);1503}1504 1505static int bmp380_chip_config(struct bmp280_data *data)1506{1507 bool change = false, aux;1508 unsigned int tmp;1509 u8 osrs;1510 int ret;1511 1512 /* Configure power control register */1513 ret = regmap_update_bits(data->regmap, BMP380_REG_POWER_CONTROL,1514 BMP380_CTRL_SENSORS_MASK,1515 BMP380_CTRL_SENSORS_PRESS_EN |1516 BMP380_CTRL_SENSORS_TEMP_EN);1517 if (ret) {1518 dev_err(data->dev,1519 "failed to write operation control register\n");1520 return ret;1521 }1522 1523 /* Configure oversampling */1524 osrs = FIELD_PREP(BMP380_OSRS_TEMP_MASK, data->oversampling_temp) |1525 FIELD_PREP(BMP380_OSRS_PRESS_MASK, data->oversampling_press);1526 1527 ret = regmap_update_bits_check(data->regmap, BMP380_REG_OSR,1528 BMP380_OSRS_TEMP_MASK |1529 BMP380_OSRS_PRESS_MASK,1530 osrs, &aux);1531 if (ret) {1532 dev_err(data->dev, "failed to write oversampling register\n");1533 return ret;1534 }1535 change = change || aux;1536 1537 /* Configure output data rate */1538 ret = regmap_update_bits_check(data->regmap, BMP380_REG_ODR,1539 BMP380_ODRS_MASK, data->sampling_freq,1540 &aux);1541 if (ret) {1542 dev_err(data->dev, "failed to write ODR selection register\n");1543 return ret;1544 }1545 change = change || aux;1546 1547 /* Set filter data */1548 ret = regmap_update_bits_check(data->regmap, BMP380_REG_CONFIG, BMP380_FILTER_MASK,1549 FIELD_PREP(BMP380_FILTER_MASK, data->iir_filter_coeff),1550 &aux);1551 if (ret) {1552 dev_err(data->dev, "failed to write config register\n");1553 return ret;1554 }1555 change = change || aux;1556 1557 if (change) {1558 /*1559 * The configurations errors are detected on the fly during a1560 * measurement cycle. If the sampling frequency is too low, it's1561 * faster to reset the measurement loop than wait until the next1562 * measurement is due.1563 *1564 * Resets sensor measurement loop toggling between sleep and1565 * normal operating modes.1566 */1567 ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,1568 BMP380_MODE_MASK,1569 FIELD_PREP(BMP380_MODE_MASK, BMP380_MODE_SLEEP));1570 if (ret) {1571 dev_err(data->dev, "failed to set sleep mode\n");1572 return ret;1573 }1574 usleep_range(2000, 2500);1575 ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,1576 BMP380_MODE_MASK,1577 FIELD_PREP(BMP380_MODE_MASK, BMP380_MODE_NORMAL));1578 if (ret) {1579 dev_err(data->dev, "failed to set normal mode\n");1580 return ret;1581 }1582 /*1583 * Waits for measurement before checking configuration error1584 * flag. Selected longest measurement time, calculated from1585 * formula in datasheet section 3.9.2 with an offset of ~+15%1586 * as it seen as well in table 3.9.1.1587 */1588 msleep(150);1589 1590 /* Check config error flag */1591 ret = regmap_read(data->regmap, BMP380_REG_ERROR, &tmp);1592 if (ret) {1593 dev_err(data->dev, "failed to read error register\n");1594 return ret;1595 }1596 if (tmp & BMP380_ERR_CONF_MASK) {1597 dev_warn(data->dev,1598 "sensor flagged configuration as incompatible\n");1599 return -EINVAL;1600 }1601 }1602 1603 return 0;1604}1605 1606static irqreturn_t bmp380_trigger_handler(int irq, void *p)1607{1608 struct iio_poll_func *pf = p;1609 struct iio_dev *indio_dev = pf->indio_dev;1610 struct bmp280_data *data = iio_priv(indio_dev);1611 s32 adc_temp, adc_press, t_fine;1612 int ret;1613 1614 guard(mutex)(&data->lock);1615 1616 /* Burst read data registers */1617 ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,1618 data->buf, BMP280_BURST_READ_BYTES);1619 if (ret) {1620 dev_err(data->dev, "failed to burst read sensor data\n");1621 goto out;1622 }1623 1624 /* Temperature calculations */1625 adc_temp = get_unaligned_le24(&data->buf[3]);1626 if (adc_temp == BMP380_TEMP_SKIPPED) {1627 dev_err(data->dev, "reading temperature skipped\n");1628 goto out;1629 }1630 1631 data->sensor_data[1] = bmp380_compensate_temp(data, adc_temp);1632 1633 /* Pressure calculations */1634 adc_press = get_unaligned_le24(&data->buf[0]);1635 if (adc_press == BMP380_PRESS_SKIPPED) {1636 dev_err(data->dev, "reading pressure skipped\n");1637 goto out;1638 }1639 1640 t_fine = bmp380_calc_t_fine(data, adc_temp);1641 1642 data->sensor_data[0] = bmp380_compensate_press(data, adc_press, t_fine);1643 1644 iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,1645 iio_get_time_ns(indio_dev));1646 1647out:1648 iio_trigger_notify_done(indio_dev->trig);1649 1650 return IRQ_HANDLED;1651}1652 1653static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };1654static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};1655static const u8 bmp380_chip_ids[] = { BMP380_CHIP_ID, BMP390_CHIP_ID };1656static const int bmp380_temp_coeffs[] = { 10, 1 };1657static const int bmp380_press_coeffs[] = { 1, 100000 };1658 1659const struct bmp280_chip_info bmp380_chip_info = {1660 .id_reg = BMP380_REG_ID,1661 .chip_id = bmp380_chip_ids,1662 .num_chip_id = ARRAY_SIZE(bmp380_chip_ids),1663 .regmap_config = &bmp380_regmap_config,1664 .spi_read_extra_byte = true,1665 .start_up_time = 2000,1666 .channels = bmp380_channels,1667 .num_channels = ARRAY_SIZE(bmp380_channels),1668 .avail_scan_masks = bmp280_avail_scan_masks,1669 1670 .oversampling_temp_avail = bmp380_oversampling_avail,1671 .num_oversampling_temp_avail = ARRAY_SIZE(bmp380_oversampling_avail),1672 .oversampling_temp_default = ilog2(1),1673 1674 .oversampling_press_avail = bmp380_oversampling_avail,1675 .num_oversampling_press_avail = ARRAY_SIZE(bmp380_oversampling_avail),1676 .oversampling_press_default = ilog2(4),1677 1678 .sampling_freq_avail = bmp380_odr_table,1679 .num_sampling_freq_avail = ARRAY_SIZE(bmp380_odr_table) * 2,1680 .sampling_freq_default = BMP380_ODR_50HZ,1681 1682 .iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,1683 .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),1684 .iir_filter_coeff_default = 2,1685 1686 .temp_coeffs = bmp380_temp_coeffs,1687 .temp_coeffs_type = IIO_VAL_FRACTIONAL,1688 .press_coeffs = bmp380_press_coeffs,1689 .press_coeffs_type = IIO_VAL_FRACTIONAL,1690 1691 .chip_config = bmp380_chip_config,1692 .read_temp = bmp380_read_temp,1693 .read_press = bmp380_read_press,1694 .read_calib = bmp380_read_calib,1695 .preinit = bmp380_preinit,1696 1697 .trigger_handler = bmp380_trigger_handler,1698};1699EXPORT_SYMBOL_NS(bmp380_chip_info, IIO_BMP280);1700 1701static int bmp580_soft_reset(struct bmp280_data *data)1702{1703 unsigned int reg;1704 int ret;1705 1706 ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_SOFT_RESET);1707 if (ret) {1708 dev_err(data->dev, "failed to send reset command to device\n");1709 return ret;1710 }1711 usleep_range(2000, 2500);1712 1713 /* Dummy read of chip_id */1714 ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);1715 if (ret) {1716 dev_err(data->dev, "failed to reestablish comms after reset\n");1717 return ret;1718 }1719 1720 ret = regmap_read(data->regmap, BMP580_REG_INT_STATUS, ®);1721 if (ret) {1722 dev_err(data->dev, "error reading interrupt status register\n");1723 return ret;1724 }1725 if (!(reg & BMP580_INT_STATUS_POR_MASK)) {1726 dev_err(data->dev, "error resetting sensor\n");1727 return -EINVAL;1728 }1729 1730 return 0;1731}1732 1733/**1734 * bmp580_nvm_operation() - Helper function to commit NVM memory operations1735 * @data: sensor data struct1736 * @is_write: flag to signal write operation1737 */1738static int bmp580_nvm_operation(struct bmp280_data *data, bool is_write)1739{1740 unsigned long timeout, poll;1741 unsigned int reg;1742 int ret;1743 1744 /* Check NVM ready flag */1745 ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);1746 if (ret) {1747 dev_err(data->dev, "failed to check nvm status\n");1748 return ret;1749 }1750 if (!(reg & BMP580_STATUS_NVM_RDY_MASK)) {1751 dev_err(data->dev, "sensor's nvm is not ready\n");1752 return -EIO;1753 }1754 1755 /* Start NVM operation sequence */1756 ret = regmap_write(data->regmap, BMP580_REG_CMD,1757 BMP580_CMD_NVM_OP_SEQ_0);1758 if (ret) {1759 dev_err(data->dev,1760 "failed to send nvm operation's first sequence\n");1761 return ret;1762 }1763 if (is_write) {1764 /* Send NVM write sequence */1765 ret = regmap_write(data->regmap, BMP580_REG_CMD,1766 BMP580_CMD_NVM_WRITE_SEQ_1);1767 if (ret) {1768 dev_err(data->dev,1769 "failed to send nvm write sequence\n");1770 return ret;1771 }1772 /* Datasheet says on 4.8.1.2 it takes approximately 10ms */1773 poll = 2000;1774 timeout = 12000;1775 } else {1776 /* Send NVM read sequence */1777 ret = regmap_write(data->regmap, BMP580_REG_CMD,1778 BMP580_CMD_NVM_READ_SEQ_1);1779 if (ret) {1780 dev_err(data->dev,1781 "failed to send nvm read sequence\n");1782 return ret;1783 }1784 /* Datasheet says on 4.8.1.1 it takes approximately 200us */1785 poll = 50;1786 timeout = 400;1787 }1788 1789 /* Wait until NVM is ready again */1790 ret = regmap_read_poll_timeout(data->regmap, BMP580_REG_STATUS, reg,1791 (reg & BMP580_STATUS_NVM_RDY_MASK),1792 poll, timeout);1793 if (ret) {1794 dev_err(data->dev, "error checking nvm operation status\n");1795 return ret;1796 }1797 1798 /* Check NVM error flags */1799 if ((reg & BMP580_STATUS_NVM_ERR_MASK) || (reg & BMP580_STATUS_NVM_CMD_ERR_MASK)) {1800 dev_err(data->dev, "error processing nvm operation\n");1801 return -EIO;1802 }1803 1804 return 0;1805}1806 1807/*1808 * Contrary to previous sensors families, compensation algorithm is builtin.1809 * We are only required to read the register raw data and adapt the ranges1810 * for what is expected on IIO ABI.1811 */1812 1813static int bmp580_read_temp(struct bmp280_data *data, s32 *raw_temp)1814{1815 s32 value_temp;1816 int ret;1817 1818 ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,1819 data->buf, BMP280_NUM_TEMP_BYTES);1820 if (ret) {1821 dev_err(data->dev, "failed to read temperature\n");1822 return ret;1823 }1824 1825 value_temp = get_unaligned_le24(data->buf);1826 if (value_temp == BMP580_TEMP_SKIPPED) {1827 dev_err(data->dev, "reading temperature skipped\n");1828 return -EIO;1829 }1830 *raw_temp = sign_extend32(value_temp, 23);1831 1832 return 0;1833}1834 1835static int bmp580_read_press(struct bmp280_data *data, u32 *raw_press)1836{1837 u32 value_press;1838 int ret;1839 1840 ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB,1841 data->buf, BMP280_NUM_PRESS_BYTES);1842 if (ret) {1843 dev_err(data->dev, "failed to read pressure\n");1844 return ret;1845 }1846 1847 value_press = get_unaligned_le24(data->buf);1848 if (value_press == BMP580_PRESS_SKIPPED) {1849 dev_err(data->dev, "reading pressure skipped\n");1850 return -EIO;1851 }1852 *raw_press = value_press;1853 1854 return 0;1855}1856 1857static const int bmp580_odr_table[][2] = {1858 [BMP580_ODR_240HZ] = {240, 0},1859 [BMP580_ODR_218HZ] = {218, 0},1860 [BMP580_ODR_199HZ] = {199, 0},1861 [BMP580_ODR_179HZ] = {179, 0},1862 [BMP580_ODR_160HZ] = {160, 0},1863 [BMP580_ODR_149HZ] = {149, 0},1864 [BMP580_ODR_140HZ] = {140, 0},1865 [BMP580_ODR_129HZ] = {129, 0},1866 [BMP580_ODR_120HZ] = {120, 0},1867 [BMP580_ODR_110HZ] = {110, 0},1868 [BMP580_ODR_100HZ] = {100, 0},1869 [BMP580_ODR_89HZ] = {89, 0},1870 [BMP580_ODR_80HZ] = {80, 0},1871 [BMP580_ODR_70HZ] = {70, 0},1872 [BMP580_ODR_60HZ] = {60, 0},1873 [BMP580_ODR_50HZ] = {50, 0},1874 [BMP580_ODR_45HZ] = {45, 0},1875 [BMP580_ODR_40HZ] = {40, 0},1876 [BMP580_ODR_35HZ] = {35, 0},1877 [BMP580_ODR_30HZ] = {30, 0},1878 [BMP580_ODR_25HZ] = {25, 0},1879 [BMP580_ODR_20HZ] = {20, 0},1880 [BMP580_ODR_15HZ] = {15, 0},1881 [BMP580_ODR_10HZ] = {10, 0},1882 [BMP580_ODR_5HZ] = {5, 0},1883 [BMP580_ODR_4HZ] = {4, 0},1884 [BMP580_ODR_3HZ] = {3, 0},1885 [BMP580_ODR_2HZ] = {2, 0},1886 [BMP580_ODR_1HZ] = {1, 0},1887 [BMP580_ODR_0_5HZ] = {0, 500000},1888 [BMP580_ODR_0_25HZ] = {0, 250000},1889 [BMP580_ODR_0_125HZ] = {0, 125000},1890};1891 1892static const int bmp580_nvmem_addrs[] = { 0x20, 0x21, 0x22 };1893 1894static int bmp580_nvmem_read_impl(void *priv, unsigned int offset, void *val,1895 size_t bytes)1896{1897 struct bmp280_data *data = priv;1898 u16 *dst = val;1899 int ret, addr;1900 1901 guard(mutex)(&data->lock);1902 1903 /* Set sensor in standby mode */1904 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,1905 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,1906 BMP580_ODR_DEEPSLEEP_DIS |1907 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));1908 if (ret) {1909 dev_err(data->dev, "failed to change sensor to standby mode\n");1910 goto exit;1911 }1912 /* Wait standby transition time */1913 usleep_range(2500, 3000);1914 1915 while (bytes >= sizeof(*dst)) {1916 addr = bmp580_nvmem_addrs[offset / sizeof(*dst)];1917 1918 ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,1919 FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));1920 if (ret) {1921 dev_err(data->dev, "error writing nvm address\n");1922 goto exit;1923 }1924 1925 ret = bmp580_nvm_operation(data, false);1926 if (ret)1927 goto exit;1928 1929 ret = regmap_bulk_read(data->regmap, BMP580_REG_NVM_DATA_LSB,1930 &data->le16, sizeof(data->le16));1931 if (ret) {1932 dev_err(data->dev, "error reading nvm data regs\n");1933 goto exit;1934 }1935 1936 *dst++ = le16_to_cpu(data->le16);1937 bytes -= sizeof(*dst);1938 offset += sizeof(*dst);1939 }1940exit:1941 /* Restore chip config */1942 data->chip_info->chip_config(data);1943 return ret;1944}1945 1946static int bmp580_nvmem_read(void *priv, unsigned int offset, void *val,1947 size_t bytes)1948{1949 struct bmp280_data *data = priv;1950 int ret;1951 1952 pm_runtime_get_sync(data->dev);1953 ret = bmp580_nvmem_read_impl(priv, offset, val, bytes);1954 pm_runtime_mark_last_busy(data->dev);1955 pm_runtime_put_autosuspend(data->dev);1956 1957 return ret;1958}1959 1960static int bmp580_nvmem_write_impl(void *priv, unsigned int offset, void *val,1961 size_t bytes)1962{1963 struct bmp280_data *data = priv;1964 u16 *buf = val;1965 int ret, addr;1966 1967 guard(mutex)(&data->lock);1968 1969 /* Set sensor in standby mode */1970 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,1971 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,1972 BMP580_ODR_DEEPSLEEP_DIS |1973 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));1974 if (ret) {1975 dev_err(data->dev, "failed to change sensor to standby mode\n");1976 goto exit;1977 }1978 /* Wait standby transition time */1979 usleep_range(2500, 3000);1980 1981 while (bytes >= sizeof(*buf)) {1982 addr = bmp580_nvmem_addrs[offset / sizeof(*buf)];1983 1984 ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,1985 BMP580_NVM_PROG_EN |1986 FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));1987 if (ret) {1988 dev_err(data->dev, "error writing nvm address\n");1989 goto exit;1990 }1991 data->le16 = cpu_to_le16(*buf++);1992 1993 ret = regmap_bulk_write(data->regmap, BMP580_REG_NVM_DATA_LSB,1994 &data->le16, sizeof(data->le16));1995 if (ret) {1996 dev_err(data->dev, "error writing LSB NVM data regs\n");1997 goto exit;1998 }1999 2000 ret = bmp580_nvm_operation(data, true);2001 if (ret)2002 goto exit;2003 2004 /* Disable programming mode bit */2005 ret = regmap_clear_bits(data->regmap, BMP580_REG_NVM_ADDR,2006 BMP580_NVM_PROG_EN);2007 if (ret) {2008 dev_err(data->dev, "error resetting nvm write\n");2009 goto exit;2010 }2011 2012 bytes -= sizeof(*buf);2013 offset += sizeof(*buf);2014 }2015exit:2016 /* Restore chip config */2017 data->chip_info->chip_config(data);2018 return ret;2019}2020 2021static int bmp580_nvmem_write(void *priv, unsigned int offset, void *val,2022 size_t bytes)2023{2024 struct bmp280_data *data = priv;2025 int ret;2026 2027 pm_runtime_get_sync(data->dev);2028 ret = bmp580_nvmem_write_impl(priv, offset, val, bytes);2029 pm_runtime_mark_last_busy(data->dev);2030 pm_runtime_put_autosuspend(data->dev);2031 2032 return ret;2033}2034 2035static int bmp580_preinit(struct bmp280_data *data)2036{2037 struct nvmem_config config = {2038 .dev = data->dev,2039 .priv = data,2040 .name = "bmp580_nvmem",2041 .word_size = sizeof(u16),2042 .stride = sizeof(u16),2043 .size = 3 * sizeof(u16),2044 .reg_read = bmp580_nvmem_read,2045 .reg_write = bmp580_nvmem_write,2046 };2047 unsigned int reg;2048 int ret;2049 2050 /* Issue soft-reset command */2051 ret = bmp580_soft_reset(data);2052 if (ret)2053 return ret;2054 2055 /* Post powerup sequence */2056 ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);2057 if (ret) {2058 dev_err(data->dev, "failed to establish comms with the chip\n");2059 return ret;2060 }2061 2062 /* Print warn message if we don't know the chip id */2063 if (reg != BMP580_CHIP_ID && reg != BMP580_CHIP_ID_ALT)2064 dev_warn(data->dev, "unexpected chip_id\n");2065 2066 ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);2067 if (ret) {2068 dev_err(data->dev, "failed to read nvm status\n");2069 return ret;2070 }2071 2072 /* Check nvm status */2073 if (!(reg & BMP580_STATUS_NVM_RDY_MASK) || (reg & BMP580_STATUS_NVM_ERR_MASK)) {2074 dev_err(data->dev, "nvm error on powerup sequence\n");2075 return -EIO;2076 }2077 2078 /* Register nvmem device */2079 return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));2080}2081 2082static int bmp580_chip_config(struct bmp280_data *data)2083{2084 bool change = false, aux;2085 unsigned int tmp;2086 u8 reg_val;2087 int ret;2088 2089 /* Sets sensor in standby mode */2090 ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,2091 BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,2092 BMP580_ODR_DEEPSLEEP_DIS |2093 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));2094 if (ret) {2095 dev_err(data->dev, "failed to change sensor to standby mode\n");2096 return ret;2097 }2098 /* From datasheet's table 4: electrical characteristics */2099 usleep_range(2500, 3000);2100 2101 /* Set default DSP mode settings */2102 reg_val = FIELD_PREP(BMP580_DSP_COMP_MASK, BMP580_DSP_PRESS_TEMP_COMP_EN) |2103 BMP580_DSP_SHDW_IIR_TEMP_EN | BMP580_DSP_SHDW_IIR_PRESS_EN;2104 2105 ret = regmap_update_bits(data->regmap, BMP580_REG_DSP_CONFIG,2106 BMP580_DSP_COMP_MASK |2107 BMP580_DSP_SHDW_IIR_TEMP_EN |2108 BMP580_DSP_SHDW_IIR_PRESS_EN, reg_val);2109 if (ret) {2110 dev_err(data->dev, "failed to change DSP mode settings\n");2111 return ret;2112 }2113 2114 /* Configure oversampling */2115 reg_val = FIELD_PREP(BMP580_OSR_TEMP_MASK, data->oversampling_temp) |2116 FIELD_PREP(BMP580_OSR_PRESS_MASK, data->oversampling_press) |2117 BMP580_OSR_PRESS_EN;2118 2119 ret = regmap_update_bits_check(data->regmap, BMP580_REG_OSR_CONFIG,2120 BMP580_OSR_TEMP_MASK |2121 BMP580_OSR_PRESS_MASK |2122 BMP580_OSR_PRESS_EN,2123 reg_val, &aux);2124 if (ret) {2125 dev_err(data->dev, "failed to write oversampling register\n");2126 return ret;2127 }2128 change = change || aux;2129 2130 /* Configure output data rate */2131 ret = regmap_update_bits_check(data->regmap, BMP580_REG_ODR_CONFIG, BMP580_ODR_MASK,2132 FIELD_PREP(BMP580_ODR_MASK, data->sampling_freq),2133 &aux);2134 if (ret) {2135 dev_err(data->dev, "failed to write ODR configuration register\n");2136 return ret;2137 }2138 change = change || aux;2139 2140 /* Set filter data */2141 reg_val = FIELD_PREP(BMP580_DSP_IIR_PRESS_MASK, data->iir_filter_coeff) |2142 FIELD_PREP(BMP580_DSP_IIR_TEMP_MASK, data->iir_filter_coeff);2143 2144 ret = regmap_update_bits_check(data->regmap, BMP580_REG_DSP_IIR,2145 BMP580_DSP_IIR_PRESS_MASK |2146 BMP580_DSP_IIR_TEMP_MASK,2147 reg_val, &aux);2148 if (ret) {2149 dev_err(data->dev, "failed to write config register\n");2150 return ret;2151 }2152 change = change || aux;2153 2154 /* Restore sensor to normal operation mode */2155 ret = regmap_write_bits(data->regmap, BMP580_REG_ODR_CONFIG,2156 BMP580_MODE_MASK,2157 FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_NORMAL));2158 if (ret) {2159 dev_err(data->dev, "failed to set normal mode\n");2160 return ret;2161 }2162 /* From datasheet's table 4: electrical characteristics */2163 usleep_range(3000, 3500);2164 2165 if (change) {2166 /*2167 * Check if ODR and OSR settings are valid or we are2168 * operating in a degraded mode.2169 */2170 ret = regmap_read(data->regmap, BMP580_REG_EFF_OSR, &tmp);2171 if (ret) {2172 dev_err(data->dev,2173 "error reading effective OSR register\n");2174 return ret;2175 }2176 if (!(tmp & BMP580_EFF_OSR_VALID_ODR)) {2177 dev_warn(data->dev, "OSR and ODR incompatible settings detected\n");2178 /* Set current OSR settings from data on effective OSR */2179 data->oversampling_temp = FIELD_GET(BMP580_EFF_OSR_TEMP_MASK, tmp);2180 data->oversampling_press = FIELD_GET(BMP580_EFF_OSR_PRESS_MASK, tmp);2181 return -EINVAL;2182 }2183 }2184 2185 return 0;2186}2187 2188static irqreturn_t bmp580_trigger_handler(int irq, void *p)2189{2190 struct iio_poll_func *pf = p;2191 struct iio_dev *indio_dev = pf->indio_dev;2192 struct bmp280_data *data = iio_priv(indio_dev);2193 int ret;2194 2195 guard(mutex)(&data->lock);2196 2197 /* Burst read data registers */2198 ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,2199 data->buf, BMP280_BURST_READ_BYTES);2200 if (ret) {2201 dev_err(data->dev, "failed to burst read sensor data\n");2202 goto out;2203 }2204 2205 /* Temperature calculations */2206 memcpy(&data->sensor_data[1], &data->buf[0], 3);2207 2208 /* Pressure calculations */2209 memcpy(&data->sensor_data[0], &data->buf[3], 3);2210 2211 iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,2212 iio_get_time_ns(indio_dev));2213 2214out:2215 iio_trigger_notify_done(indio_dev->trig);2216 2217 return IRQ_HANDLED;2218}2219 2220static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };2221static const u8 bmp580_chip_ids[] = { BMP580_CHIP_ID, BMP580_CHIP_ID_ALT };2222/* Instead of { 1000, 16 } we do this, to avoid overflow issues */2223static const int bmp580_temp_coeffs[] = { 125, 13 };2224static const int bmp580_press_coeffs[] = { 1, 64000};2225 2226const struct bmp280_chip_info bmp580_chip_info = {2227 .id_reg = BMP580_REG_CHIP_ID,2228 .chip_id = bmp580_chip_ids,2229 .num_chip_id = ARRAY_SIZE(bmp580_chip_ids),2230 .regmap_config = &bmp580_regmap_config,2231 .start_up_time = 2000,2232 .channels = bmp580_channels,2233 .num_channels = ARRAY_SIZE(bmp580_channels),2234 .avail_scan_masks = bmp280_avail_scan_masks,2235 2236 .oversampling_temp_avail = bmp580_oversampling_avail,2237 .num_oversampling_temp_avail = ARRAY_SIZE(bmp580_oversampling_avail),2238 .oversampling_temp_default = ilog2(1),2239 2240 .oversampling_press_avail = bmp580_oversampling_avail,2241 .num_oversampling_press_avail = ARRAY_SIZE(bmp580_oversampling_avail),2242 .oversampling_press_default = ilog2(4),2243 2244 .sampling_freq_avail = bmp580_odr_table,2245 .num_sampling_freq_avail = ARRAY_SIZE(bmp580_odr_table) * 2,2246 .sampling_freq_default = BMP580_ODR_50HZ,2247 2248 .iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,2249 .num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),2250 .iir_filter_coeff_default = 2,2251 2252 .temp_coeffs = bmp580_temp_coeffs,2253 .temp_coeffs_type = IIO_VAL_FRACTIONAL_LOG2,2254 .press_coeffs = bmp580_press_coeffs,2255 .press_coeffs_type = IIO_VAL_FRACTIONAL,2256 2257 .chip_config = bmp580_chip_config,2258 .read_temp = bmp580_read_temp,2259 .read_press = bmp580_read_press,2260 .preinit = bmp580_preinit,2261 2262 .trigger_handler = bmp580_trigger_handler,2263};2264EXPORT_SYMBOL_NS(bmp580_chip_info, IIO_BMP280);2265 2266static int bmp180_wait_for_eoc(struct bmp280_data *data, u8 ctrl_meas)2267{2268 static const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };2269 unsigned int delay_us;2270 unsigned int ctrl;2271 int ret;2272 2273 if (data->use_eoc)2274 reinit_completion(&data->done);2275 2276 ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);2277 if (ret) {2278 dev_err(data->dev, "failed to write crtl_meas register\n");2279 return ret;2280 }2281 2282 if (data->use_eoc) {2283 /*2284 * If we have a completion interrupt, use it, wait up to2285 * 100ms. The longest conversion time listed is 76.5 ms for2286 * advanced resolution mode.2287 */2288 ret = wait_for_completion_timeout(&data->done,2289 1 + msecs_to_jiffies(100));2290 if (!ret)2291 dev_err(data->dev, "timeout waiting for completion\n");2292 } else {2293 if (FIELD_GET(BMP180_MEAS_CTRL_MASK, ctrl_meas) == BMP180_MEAS_TEMP)2294 delay_us = 4500;2295 else2296 delay_us =2297 conversion_time_max[data->oversampling_press];2298 2299 usleep_range(delay_us, delay_us + 1000);2300 }2301 2302 ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);2303 if (ret) {2304 dev_err(data->dev, "failed to read ctrl_meas register\n");2305 return ret;2306 }2307 2308 /* The value of this bit reset to "0" after conversion is complete */2309 if (ctrl & BMP180_MEAS_SCO) {2310 dev_err(data->dev, "conversion didn't complete\n");2311 return -EIO;2312 }2313 2314 return 0;2315}2316 2317static int bmp180_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)2318{2319 int ret;2320 2321 ret = bmp180_wait_for_eoc(data,2322 FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_TEMP) |2323 BMP180_MEAS_SCO);2324 if (ret)2325 return ret;2326 2327 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,2328 &data->be16, sizeof(data->be16));2329 if (ret) {2330 dev_err(data->dev, "failed to read temperature\n");2331 return ret;2332 }2333 2334 *adc_temp = be16_to_cpu(data->be16);2335 2336 return 0;2337}2338 2339static int bmp180_read_calib(struct bmp280_data *data)2340{2341 struct bmp180_calib *calib = &data->calib.bmp180;2342 int ret;2343 int i;2344 2345 ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START,2346 data->bmp180_cal_buf, sizeof(data->bmp180_cal_buf));2347 if (ret) {2348 dev_err(data->dev, "failed to read calibration parameters\n");2349 return ret;2350 }2351 2352 /* None of the words has the value 0 or 0xFFFF */2353 for (i = 0; i < ARRAY_SIZE(data->bmp180_cal_buf); i++) {2354 if (data->bmp180_cal_buf[i] == cpu_to_be16(0) ||2355 data->bmp180_cal_buf[i] == cpu_to_be16(0xffff))2356 return -EIO;2357 }2358 2359 /* Toss the calibration data into the entropy pool */2360 add_device_randomness(data->bmp180_cal_buf,2361 sizeof(data->bmp180_cal_buf));2362 2363 calib->AC1 = be16_to_cpu(data->bmp180_cal_buf[AC1]);2364 calib->AC2 = be16_to_cpu(data->bmp180_cal_buf[AC2]);2365 calib->AC3 = be16_to_cpu(data->bmp180_cal_buf[AC3]);2366 calib->AC4 = be16_to_cpu(data->bmp180_cal_buf[AC4]);2367 calib->AC5 = be16_to_cpu(data->bmp180_cal_buf[AC5]);2368 calib->AC6 = be16_to_cpu(data->bmp180_cal_buf[AC6]);2369 calib->B1 = be16_to_cpu(data->bmp180_cal_buf[B1]);2370 calib->B2 = be16_to_cpu(data->bmp180_cal_buf[B2]);2371 calib->MB = be16_to_cpu(data->bmp180_cal_buf[MB]);2372 calib->MC = be16_to_cpu(data->bmp180_cal_buf[MC]);2373 calib->MD = be16_to_cpu(data->bmp180_cal_buf[MD]);2374 2375 return 0;2376}2377 2378/*2379 * Returns temperature in DegC, resolution is 0.1 DegC.2380 * t_fine carries fine temperature as global value.2381 *2382 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".2383 */2384 2385static s32 bmp180_calc_t_fine(struct bmp280_data *data, u32 adc_temp)2386{2387 struct bmp180_calib *calib = &data->calib.bmp180;2388 s32 x1, x2;2389 2390 x1 = ((((s32)adc_temp) - calib->AC6) * calib->AC5) >> 15;2391 x2 = (calib->MC << 11) / (x1 + calib->MD);2392 return x1 + x2; /* t_fine = x1 + x2; */2393}2394 2395static int bmp180_get_t_fine(struct bmp280_data *data, s32 *t_fine)2396{2397 s32 adc_temp;2398 int ret;2399 2400 ret = bmp180_read_temp_adc(data, &adc_temp);2401 if (ret)2402 return ret;2403 2404 *t_fine = bmp180_calc_t_fine(data, adc_temp);2405 2406 return 0;2407}2408 2409static s32 bmp180_compensate_temp(struct bmp280_data *data, u32 adc_temp)2410{2411 return (bmp180_calc_t_fine(data, adc_temp) + 8) / 16;2412}2413 2414static int bmp180_read_temp(struct bmp280_data *data, s32 *comp_temp)2415{2416 u32 adc_temp;2417 int ret;2418 2419 ret = bmp180_read_temp_adc(data, &adc_temp);2420 if (ret)2421 return ret;2422 2423 *comp_temp = bmp180_compensate_temp(data, adc_temp);2424 2425 return 0;2426}2427 2428static int bmp180_read_press_adc(struct bmp280_data *data, u32 *adc_press)2429{2430 u8 oss = data->oversampling_press;2431 int ret;2432 2433 ret = bmp180_wait_for_eoc(data,2434 FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_PRESS) |2435 FIELD_PREP(BMP180_OSRS_PRESS_MASK, oss) |2436 BMP180_MEAS_SCO);2437 if (ret)2438 return ret;2439 2440 ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,2441 data->buf, BMP280_NUM_PRESS_BYTES);2442 if (ret) {2443 dev_err(data->dev, "failed to read pressure\n");2444 return ret;2445 }2446 2447 *adc_press = get_unaligned_be24(data->buf) >> (8 - oss);2448 2449 return 0;2450}2451 2452/*2453 * Returns pressure in Pa, resolution is 1 Pa.2454 *2455 * Taken from datasheet, Section 3.5, "Calculating pressure and temperature".2456 */2457static u32 bmp180_compensate_press(struct bmp280_data *data, u32 adc_press,2458 s32 t_fine)2459{2460 struct bmp180_calib *calib = &data->calib.bmp180;2461 s32 oss = data->oversampling_press;2462 s32 x1, x2, x3, p;2463 s32 b3, b6;2464 u32 b4, b7;2465 2466 b6 = t_fine - 4000;2467 x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11;2468 x2 = calib->AC2 * b6 >> 11;2469 x3 = x1 + x2;2470 b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4;2471 x1 = calib->AC3 * b6 >> 13;2472 x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16;2473 x3 = (x1 + x2 + 2) >> 2;2474 b4 = calib->AC4 * (u32)(x3 + 32768) >> 15;2475 b7 = (adc_press - b3) * (50000 >> oss);2476 if (b7 < 0x80000000)2477 p = (b7 * 2) / b4;2478 else2479 p = (b7 / b4) * 2;2480 2481 x1 = (p >> 8) * (p >> 8);2482 x1 = (x1 * 3038) >> 16;2483 x2 = (-7357 * p) >> 16;2484 2485 return p + ((x1 + x2 + 3791) >> 4);2486}2487 2488static int bmp180_read_press(struct bmp280_data *data, u32 *comp_press)2489{2490 u32 adc_press;2491 s32 t_fine;2492 int ret;2493 2494 ret = bmp180_get_t_fine(data, &t_fine);2495 if (ret)2496 return ret;2497 2498 ret = bmp180_read_press_adc(data, &adc_press);2499 if (ret)2500 return ret;2501 2502 *comp_press = bmp180_compensate_press(data, adc_press, t_fine);2503 2504 return 0;2505}2506 2507static int bmp180_chip_config(struct bmp280_data *data)2508{2509 return 0;2510}2511 2512static irqreturn_t bmp180_trigger_handler(int irq, void *p)2513{2514 struct iio_poll_func *pf = p;2515 struct iio_dev *indio_dev = pf->indio_dev;2516 struct bmp280_data *data = iio_priv(indio_dev);2517 int ret, chan_value;2518 2519 guard(mutex)(&data->lock);2520 2521 ret = bmp180_read_temp(data, &chan_value);2522 if (ret)2523 goto out;2524 2525 data->sensor_data[1] = chan_value;2526 2527 ret = bmp180_read_press(data, &chan_value);2528 if (ret)2529 goto out;2530 2531 data->sensor_data[0] = chan_value;2532 2533 iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,2534 iio_get_time_ns(indio_dev));2535 2536out:2537 iio_trigger_notify_done(indio_dev->trig);2538 2539 return IRQ_HANDLED;2540}2541 2542static const int bmp180_oversampling_temp_avail[] = { 1 };2543static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };2544static const u8 bmp180_chip_ids[] = { BMP180_CHIP_ID };2545static const int bmp180_temp_coeffs[] = { 100, 1 };2546static const int bmp180_press_coeffs[] = { 1, 1000 };2547 2548const struct bmp280_chip_info bmp180_chip_info = {2549 .id_reg = BMP280_REG_ID,2550 .chip_id = bmp180_chip_ids,2551 .num_chip_id = ARRAY_SIZE(bmp180_chip_ids),2552 .regmap_config = &bmp180_regmap_config,2553 .start_up_time = 2000,2554 .channels = bmp280_channels,2555 .num_channels = ARRAY_SIZE(bmp280_channels),2556 .avail_scan_masks = bmp280_avail_scan_masks,2557 2558 .oversampling_temp_avail = bmp180_oversampling_temp_avail,2559 .num_oversampling_temp_avail =2560 ARRAY_SIZE(bmp180_oversampling_temp_avail),2561 .oversampling_temp_default = 0,2562 2563 .oversampling_press_avail = bmp180_oversampling_press_avail,2564 .num_oversampling_press_avail =2565 ARRAY_SIZE(bmp180_oversampling_press_avail),2566 .oversampling_press_default = BMP180_MEAS_PRESS_8X,2567 2568 .temp_coeffs = bmp180_temp_coeffs,2569 .temp_coeffs_type = IIO_VAL_FRACTIONAL,2570 .press_coeffs = bmp180_press_coeffs,2571 .press_coeffs_type = IIO_VAL_FRACTIONAL,2572 2573 .chip_config = bmp180_chip_config,2574 .read_temp = bmp180_read_temp,2575 .read_press = bmp180_read_press,2576 .read_calib = bmp180_read_calib,2577 2578 .trigger_handler = bmp180_trigger_handler,2579};2580EXPORT_SYMBOL_NS(bmp180_chip_info, IIO_BMP280);2581 2582static irqreturn_t bmp085_eoc_irq(int irq, void *d)2583{2584 struct bmp280_data *data = d;2585 2586 complete(&data->done);2587 2588 return IRQ_HANDLED;2589}2590 2591static int bmp085_fetch_eoc_irq(struct device *dev,2592 const char *name,2593 int irq,2594 struct bmp280_data *data)2595{2596 unsigned long irq_trig;2597 int ret;2598 2599 irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));2600 if (irq_trig != IRQF_TRIGGER_RISING) {2601 dev_err(dev, "non-rising trigger given for EOC interrupt, trying to enforce it\n");2602 irq_trig = IRQF_TRIGGER_RISING;2603 }2604 2605 init_completion(&data->done);2606 2607 ret = devm_request_threaded_irq(dev,2608 irq,2609 bmp085_eoc_irq,2610 NULL,2611 irq_trig,2612 name,2613 data);2614 if (ret) {2615 /* Bail out without IRQ but keep the driver in place */2616 dev_err(dev, "unable to request DRDY IRQ\n");2617 return 0;2618 }2619 2620 data->use_eoc = true;2621 return 0;2622}2623 2624static int bmp280_buffer_preenable(struct iio_dev *indio_dev)2625{2626 struct bmp280_data *data = iio_priv(indio_dev);2627 2628 pm_runtime_get_sync(data->dev);2629 2630 return 0;2631}2632 2633static int bmp280_buffer_postdisable(struct iio_dev *indio_dev)2634{2635 struct bmp280_data *data = iio_priv(indio_dev);2636 2637 pm_runtime_mark_last_busy(data->dev);2638 pm_runtime_put_autosuspend(data->dev);2639 2640 return 0;2641}2642 2643static const struct iio_buffer_setup_ops bmp280_buffer_setup_ops = {2644 .preenable = bmp280_buffer_preenable,2645 .postdisable = bmp280_buffer_postdisable,2646};2647 2648static void bmp280_pm_disable(void *data)2649{2650 struct device *dev = data;2651 2652 pm_runtime_get_sync(dev);2653 pm_runtime_put_noidle(dev);2654 pm_runtime_disable(dev);2655}2656 2657static void bmp280_regulators_disable(void *data)2658{2659 struct regulator_bulk_data *supplies = data;2660 2661 regulator_bulk_disable(BMP280_NUM_SUPPLIES, supplies);2662}2663 2664int bmp280_common_probe(struct device *dev,2665 struct regmap *regmap,2666 const struct bmp280_chip_info *chip_info,2667 const char *name,2668 int irq)2669{2670 struct iio_dev *indio_dev;2671 struct bmp280_data *data;2672 struct gpio_desc *gpiod;2673 unsigned int chip_id;2674 unsigned int i;2675 int ret;2676 2677 indio_dev = devm_iio_device_alloc(dev, sizeof(*data));2678 if (!indio_dev)2679 return -ENOMEM;2680 2681 data = iio_priv(indio_dev);2682 mutex_init(&data->lock);2683 data->dev = dev;2684 2685 indio_dev->name = name;2686 indio_dev->info = &bmp280_info;2687 indio_dev->modes = INDIO_DIRECT_MODE;2688 2689 data->chip_info = chip_info;2690 2691 /* Apply initial values from chip info structure */2692 indio_dev->channels = chip_info->channels;2693 indio_dev->num_channels = chip_info->num_channels;2694 indio_dev->available_scan_masks = chip_info->avail_scan_masks;2695 data->oversampling_press = chip_info->oversampling_press_default;2696 data->oversampling_humid = chip_info->oversampling_humid_default;2697 data->oversampling_temp = chip_info->oversampling_temp_default;2698 data->iir_filter_coeff = chip_info->iir_filter_coeff_default;2699 data->sampling_freq = chip_info->sampling_freq_default;2700 data->start_up_time = chip_info->start_up_time;2701 2702 /* Bring up regulators */2703 regulator_bulk_set_supply_names(data->supplies,2704 bmp280_supply_names,2705 BMP280_NUM_SUPPLIES);2706 2707 ret = devm_regulator_bulk_get(dev,2708 BMP280_NUM_SUPPLIES, data->supplies);2709 if (ret) {2710 dev_err(dev, "failed to get regulators\n");2711 return ret;2712 }2713 2714 ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);2715 if (ret) {2716 dev_err(dev, "failed to enable regulators\n");2717 return ret;2718 }2719 2720 ret = devm_add_action_or_reset(dev, bmp280_regulators_disable,2721 data->supplies);2722 if (ret)2723 return ret;2724 2725 /* Wait to make sure we started up properly */2726 usleep_range(data->start_up_time, data->start_up_time + 100);2727 2728 /* Bring chip out of reset if there is an assigned GPIO line */2729 gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);2730 /* Deassert the signal */2731 if (gpiod) {2732 dev_info(dev, "release reset\n");2733 gpiod_set_value(gpiod, 0);2734 }2735 2736 data->regmap = regmap;2737 2738 ret = regmap_read(regmap, data->chip_info->id_reg, &chip_id);2739 if (ret) {2740 dev_err(data->dev, "failed to read chip id\n");2741 return ret;2742 }2743 2744 for (i = 0; i < data->chip_info->num_chip_id; i++) {2745 if (chip_id == data->chip_info->chip_id[i]) {2746 dev_info(dev, "0x%x is a known chip id for %s\n", chip_id, name);2747 break;2748 }2749 }2750 2751 if (i == data->chip_info->num_chip_id)2752 dev_warn(dev, "bad chip id: 0x%x is not a known chip id\n", chip_id);2753 2754 if (data->chip_info->preinit) {2755 ret = data->chip_info->preinit(data);2756 if (ret)2757 return dev_err_probe(data->dev, ret,2758 "error running preinit tasks\n");2759 }2760 2761 ret = data->chip_info->chip_config(data);2762 if (ret)2763 return ret;2764 2765 dev_set_drvdata(dev, indio_dev);2766 2767 /*2768 * Some chips have calibration parameters "programmed into the devices'2769 * non-volatile memory during production". Let's read them out at probe2770 * time once. They will not change.2771 */2772 2773 if (data->chip_info->read_calib) {2774 ret = data->chip_info->read_calib(data);2775 if (ret)2776 return dev_err_probe(data->dev, ret,2777 "failed to read calibration coefficients\n");2778 }2779 2780 ret = devm_iio_triggered_buffer_setup(data->dev, indio_dev,2781 iio_pollfunc_store_time,2782 data->chip_info->trigger_handler,2783 &bmp280_buffer_setup_ops);2784 if (ret)2785 return dev_err_probe(data->dev, ret,2786 "iio triggered buffer setup failed\n");2787 2788 /*2789 * Attempt to grab an optional EOC IRQ - only the BMP085 has this2790 * however as it happens, the BMP085 shares the chip ID of BMP1802791 * so we look for an IRQ if we have that.2792 */2793 if (irq > 0 && (chip_id == BMP180_CHIP_ID)) {2794 ret = bmp085_fetch_eoc_irq(dev, name, irq, data);2795 if (ret)2796 return ret;2797 }2798 2799 /* Enable runtime PM */2800 pm_runtime_get_noresume(dev);2801 pm_runtime_set_active(dev);2802 pm_runtime_enable(dev);2803 /*2804 * Set autosuspend to two orders of magnitude larger than the2805 * start-up time.2806 */2807 pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10);2808 pm_runtime_use_autosuspend(dev);2809 pm_runtime_put(dev);2810 2811 ret = devm_add_action_or_reset(dev, bmp280_pm_disable, dev);2812 if (ret)2813 return ret;2814 2815 return devm_iio_device_register(dev, indio_dev);2816}2817EXPORT_SYMBOL_NS(bmp280_common_probe, IIO_BMP280);2818 2819static int bmp280_runtime_suspend(struct device *dev)2820{2821 struct iio_dev *indio_dev = dev_get_drvdata(dev);2822 struct bmp280_data *data = iio_priv(indio_dev);2823 2824 return regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies);2825}2826 2827static int bmp280_runtime_resume(struct device *dev)2828{2829 struct iio_dev *indio_dev = dev_get_drvdata(dev);2830 struct bmp280_data *data = iio_priv(indio_dev);2831 int ret;2832 2833 ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);2834 if (ret)2835 return ret;2836 2837 usleep_range(data->start_up_time, data->start_up_time + 100);2838 return data->chip_info->chip_config(data);2839}2840 2841EXPORT_RUNTIME_DEV_PM_OPS(bmp280_dev_pm_ops, bmp280_runtime_suspend,2842 bmp280_runtime_resume, NULL);2843 2844MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");2845MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");2846MODULE_LICENSE("GPL v2");2847