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![Phil Elwell](/assets/img/avatar_default.png)
The bmp085 EOC IRQ support is optional, but the driver's common probe
function queries the IRQ properties whether or not it exists, which
can trigger a NULL pointer exception. Avoid any exception by making
the query conditional on the possession of a valid IRQ.
Fixes: aae9539496
("iio: pressure: bmp280: add support for BMP085 EOC interrupt")
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230811155829.51208-1-phil@raspberrypi.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2234 lines
60 KiB
C
2234 lines
60 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
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* Copyright (c) 2012 Bosch Sensortec GmbH
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* Copyright (c) 2012 Unixphere AB
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* Copyright (c) 2014 Intel Corporation
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* Copyright (c) 2016 Linus Walleij <linus.walleij@linaro.org>
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*
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* Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
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*
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* Datasheet:
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* https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
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* https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp280-ds001.pdf
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* https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf
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* https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp388-ds001.pdf
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* https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmp581-ds004.pdf
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*
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* Notice:
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* The link to the bmp180 datasheet points to an outdated version missing these changes:
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* - Changed document referral from ANP015 to BST-MPS-AN004-00 on page 26
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* - Updated equation for B3 param on section 3.5 to ((((long)AC1 * 4 + X3) << oss) + 2) / 4
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* - Updated RoHS directive to 2011/65/EU effective 8 June 2011 on page 26
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*/
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#define pr_fmt(fmt) "bmp280: " fmt
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#include <linux/bitops.h>
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/regmap.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h> /* For irq_get_irq_data() */
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#include <linux/completion.h>
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#include <linux/pm_runtime.h>
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#include <linux/random.h>
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#include <asm/unaligned.h>
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#include "bmp280.h"
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/*
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* These enums are used for indexing into the array of calibration
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* coefficients for BMP180.
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*/
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enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD };
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enum bmp380_odr {
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BMP380_ODR_200HZ,
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BMP380_ODR_100HZ,
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BMP380_ODR_50HZ,
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BMP380_ODR_25HZ,
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BMP380_ODR_12_5HZ,
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BMP380_ODR_6_25HZ,
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BMP380_ODR_3_125HZ,
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BMP380_ODR_1_5625HZ,
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BMP380_ODR_0_78HZ,
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BMP380_ODR_0_39HZ,
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BMP380_ODR_0_2HZ,
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BMP380_ODR_0_1HZ,
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BMP380_ODR_0_05HZ,
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BMP380_ODR_0_02HZ,
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BMP380_ODR_0_01HZ,
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BMP380_ODR_0_006HZ,
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BMP380_ODR_0_003HZ,
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BMP380_ODR_0_0015HZ,
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};
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enum bmp580_odr {
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BMP580_ODR_240HZ,
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BMP580_ODR_218HZ,
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BMP580_ODR_199HZ,
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BMP580_ODR_179HZ,
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BMP580_ODR_160HZ,
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BMP580_ODR_149HZ,
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BMP580_ODR_140HZ,
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BMP580_ODR_129HZ,
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BMP580_ODR_120HZ,
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BMP580_ODR_110HZ,
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BMP580_ODR_100HZ,
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BMP580_ODR_89HZ,
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BMP580_ODR_80HZ,
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BMP580_ODR_70HZ,
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BMP580_ODR_60HZ,
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BMP580_ODR_50HZ,
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BMP580_ODR_45HZ,
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BMP580_ODR_40HZ,
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BMP580_ODR_35HZ,
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BMP580_ODR_30HZ,
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BMP580_ODR_25HZ,
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BMP580_ODR_20HZ,
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BMP580_ODR_15HZ,
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BMP580_ODR_10HZ,
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BMP580_ODR_5HZ,
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BMP580_ODR_4HZ,
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BMP580_ODR_3HZ,
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BMP580_ODR_2HZ,
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BMP580_ODR_1HZ,
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BMP580_ODR_0_5HZ,
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BMP580_ODR_0_25HZ,
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BMP580_ODR_0_125HZ,
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};
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/*
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* These enums are used for indexing into the array of compensation
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* parameters for BMP280.
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*/
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enum { T1, T2, T3, P1, P2, P3, P4, P5, P6, P7, P8, P9 };
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enum {
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/* Temperature calib indexes */
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BMP380_T1 = 0,
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BMP380_T2 = 2,
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BMP380_T3 = 4,
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/* Pressure calib indexes */
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BMP380_P1 = 5,
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BMP380_P2 = 7,
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BMP380_P3 = 9,
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BMP380_P4 = 10,
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BMP380_P5 = 11,
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BMP380_P6 = 13,
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BMP380_P7 = 15,
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BMP380_P8 = 16,
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BMP380_P9 = 17,
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BMP380_P10 = 19,
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BMP380_P11 = 20,
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};
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static const struct iio_chan_spec bmp280_channels[] = {
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{
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.type = IIO_PRESSURE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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},
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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},
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};
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static const struct iio_chan_spec bmp380_channels[] = {
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{
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.type = IIO_PRESSURE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
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},
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
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},
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};
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static int bmp280_read_calib(struct bmp280_data *data)
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{
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struct bmp280_calib *calib = &data->calib.bmp280;
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int ret;
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/* Read temperature and pressure calibration values. */
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
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data->bmp280_cal_buf, sizeof(data->bmp280_cal_buf));
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if (ret < 0) {
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dev_err(data->dev,
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"failed to read temperature and pressure calibration parameters\n");
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return ret;
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}
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/* Toss the temperature and pressure calibration data into the entropy pool */
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add_device_randomness(data->bmp280_cal_buf, sizeof(data->bmp280_cal_buf));
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/* Parse temperature calibration values. */
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calib->T1 = le16_to_cpu(data->bmp280_cal_buf[T1]);
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calib->T2 = le16_to_cpu(data->bmp280_cal_buf[T2]);
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calib->T3 = le16_to_cpu(data->bmp280_cal_buf[T3]);
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/* Parse pressure calibration values. */
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calib->P1 = le16_to_cpu(data->bmp280_cal_buf[P1]);
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calib->P2 = le16_to_cpu(data->bmp280_cal_buf[P2]);
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calib->P3 = le16_to_cpu(data->bmp280_cal_buf[P3]);
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calib->P4 = le16_to_cpu(data->bmp280_cal_buf[P4]);
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calib->P5 = le16_to_cpu(data->bmp280_cal_buf[P5]);
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calib->P6 = le16_to_cpu(data->bmp280_cal_buf[P6]);
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calib->P7 = le16_to_cpu(data->bmp280_cal_buf[P7]);
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calib->P8 = le16_to_cpu(data->bmp280_cal_buf[P8]);
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calib->P9 = le16_to_cpu(data->bmp280_cal_buf[P9]);
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return 0;
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}
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static int bme280_read_calib(struct bmp280_data *data)
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{
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struct bmp280_calib *calib = &data->calib.bmp280;
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struct device *dev = data->dev;
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unsigned int tmp;
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int ret;
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/* Load shared calibration params with bmp280 first */
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ret = bmp280_read_calib(data);
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if (ret < 0) {
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dev_err(dev, "failed to read common bmp280 calibration parameters\n");
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return ret;
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}
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/*
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* Read humidity calibration values.
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* Due to some odd register addressing we cannot just
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* do a big bulk read. Instead, we have to read each Hx
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* value separately and sometimes do some bit shifting...
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* Humidity data is only available on BME280.
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*/
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H1, &tmp);
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if (ret < 0) {
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dev_err(dev, "failed to read H1 comp value\n");
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return ret;
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}
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calib->H1 = tmp;
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H2,
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&data->le16, sizeof(data->le16));
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if (ret < 0) {
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dev_err(dev, "failed to read H2 comp value\n");
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return ret;
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}
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calib->H2 = sign_extend32(le16_to_cpu(data->le16), 15);
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H3, &tmp);
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if (ret < 0) {
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dev_err(dev, "failed to read H3 comp value\n");
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return ret;
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}
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calib->H3 = tmp;
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H4,
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&data->be16, sizeof(data->be16));
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if (ret < 0) {
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dev_err(dev, "failed to read H4 comp value\n");
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return ret;
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}
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calib->H4 = sign_extend32(((be16_to_cpu(data->be16) >> 4) & 0xff0) |
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(be16_to_cpu(data->be16) & 0xf), 11);
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H5,
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&data->le16, sizeof(data->le16));
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if (ret < 0) {
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dev_err(dev, "failed to read H5 comp value\n");
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return ret;
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}
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calib->H5 = sign_extend32(FIELD_GET(BMP280_COMP_H5_MASK, le16_to_cpu(data->le16)), 11);
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H6, &tmp);
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if (ret < 0) {
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dev_err(dev, "failed to read H6 comp value\n");
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return ret;
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}
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calib->H6 = sign_extend32(tmp, 7);
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return 0;
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}
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/*
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* Returns humidity in percent, resolution is 0.01 percent. Output value of
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* "47445" represents 47445/1024 = 46.333 %RH.
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*
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* Taken from BME280 datasheet, Section 4.2.3, "Compensation formula".
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*/
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static u32 bmp280_compensate_humidity(struct bmp280_data *data,
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s32 adc_humidity)
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{
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struct bmp280_calib *calib = &data->calib.bmp280;
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s32 var;
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var = ((s32)data->t_fine) - (s32)76800;
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var = ((((adc_humidity << 14) - (calib->H4 << 20) - (calib->H5 * var))
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+ (s32)16384) >> 15) * (((((((var * calib->H6) >> 10)
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* (((var * (s32)calib->H3) >> 11) + (s32)32768)) >> 10)
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+ (s32)2097152) * calib->H2 + 8192) >> 14);
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var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)calib->H1) >> 4;
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var = clamp_val(var, 0, 419430400);
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return var >> 12;
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};
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/*
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* Returns temperature in DegC, resolution is 0.01 DegC. Output value of
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* "5123" equals 51.23 DegC. t_fine carries fine temperature as global
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* value.
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*
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* Taken from datasheet, Section 3.11.3, "Compensation formula".
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*/
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static s32 bmp280_compensate_temp(struct bmp280_data *data,
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s32 adc_temp)
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{
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struct bmp280_calib *calib = &data->calib.bmp280;
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s32 var1, var2;
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var1 = (((adc_temp >> 3) - ((s32)calib->T1 << 1)) *
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((s32)calib->T2)) >> 11;
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var2 = (((((adc_temp >> 4) - ((s32)calib->T1)) *
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((adc_temp >> 4) - ((s32)calib->T1))) >> 12) *
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((s32)calib->T3)) >> 14;
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data->t_fine = var1 + var2;
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return (data->t_fine * 5 + 128) >> 8;
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}
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/*
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* Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24
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* integer bits and 8 fractional bits). Output value of "24674867"
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* represents 24674867/256 = 96386.2 Pa = 963.862 hPa
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*
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* Taken from datasheet, Section 3.11.3, "Compensation formula".
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*/
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static u32 bmp280_compensate_press(struct bmp280_data *data,
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s32 adc_press)
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{
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struct bmp280_calib *calib = &data->calib.bmp280;
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s64 var1, var2, p;
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var1 = ((s64)data->t_fine) - 128000;
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var2 = var1 * var1 * (s64)calib->P6;
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var2 += (var1 * (s64)calib->P5) << 17;
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var2 += ((s64)calib->P4) << 35;
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var1 = ((var1 * var1 * (s64)calib->P3) >> 8) +
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((var1 * (s64)calib->P2) << 12);
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var1 = ((((s64)1) << 47) + var1) * ((s64)calib->P1) >> 33;
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if (var1 == 0)
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return 0;
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p = ((((s64)1048576 - adc_press) << 31) - var2) * 3125;
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p = div64_s64(p, var1);
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var1 = (((s64)calib->P9) * (p >> 13) * (p >> 13)) >> 25;
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var2 = ((s64)(calib->P8) * p) >> 19;
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p = ((p + var1 + var2) >> 8) + (((s64)calib->P7) << 4);
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return (u32)p;
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}
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static int bmp280_read_temp(struct bmp280_data *data,
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int *val, int *val2)
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{
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s32 adc_temp, comp_temp;
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int ret;
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ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
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data->buf, sizeof(data->buf));
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if (ret < 0) {
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dev_err(data->dev, "failed to read temperature\n");
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return ret;
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}
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adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));
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if (adc_temp == BMP280_TEMP_SKIPPED) {
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/* reading was skipped */
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dev_err(data->dev, "reading temperature skipped\n");
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return -EIO;
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}
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comp_temp = bmp280_compensate_temp(data, adc_temp);
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/*
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* val might be NULL if we're called by the read_press routine,
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* who only cares about the carry over t_fine value.
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*/
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if (val) {
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*val = comp_temp * 10;
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return IIO_VAL_INT;
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}
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return 0;
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}
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static int bmp280_read_press(struct bmp280_data *data,
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int *val, int *val2)
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{
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u32 comp_press;
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s32 adc_press;
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int ret;
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/* Read and compensate temperature so we get a reading of t_fine. */
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ret = bmp280_read_temp(data, NULL, NULL);
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if (ret < 0)
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return ret;
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ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
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data->buf, sizeof(data->buf));
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if (ret < 0) {
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dev_err(data->dev, "failed to read pressure\n");
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return ret;
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}
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adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(data->buf));
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if (adc_press == BMP280_PRESS_SKIPPED) {
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/* reading was skipped */
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dev_err(data->dev, "reading pressure skipped\n");
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return -EIO;
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|
}
|
|
comp_press = bmp280_compensate_press(data, adc_press);
|
|
|
|
*val = comp_press;
|
|
*val2 = 256000;
|
|
|
|
return IIO_VAL_FRACTIONAL;
|
|
}
|
|
|
|
static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
u32 comp_humidity;
|
|
s32 adc_humidity;
|
|
int ret;
|
|
|
|
/* Read and compensate temperature so we get a reading of t_fine. */
|
|
ret = bmp280_read_temp(data, NULL, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP280_REG_HUMIDITY_MSB,
|
|
&data->be16, sizeof(data->be16));
|
|
if (ret < 0) {
|
|
dev_err(data->dev, "failed to read humidity\n");
|
|
return ret;
|
|
}
|
|
|
|
adc_humidity = be16_to_cpu(data->be16);
|
|
if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {
|
|
/* reading was skipped */
|
|
dev_err(data->dev, "reading humidity skipped\n");
|
|
return -EIO;
|
|
}
|
|
comp_humidity = bmp280_compensate_humidity(data, adc_humidity);
|
|
|
|
*val = comp_humidity * 1000 / 1024;
|
|
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
static int bmp280_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_PROCESSED:
|
|
switch (chan->type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
ret = data->chip_info->read_humid(data, val, val2);
|
|
break;
|
|
case IIO_PRESSURE:
|
|
ret = data->chip_info->read_press(data, val, val2);
|
|
break;
|
|
case IIO_TEMP:
|
|
ret = data->chip_info->read_temp(data, val, val2);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
|
|
switch (chan->type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
*val = 1 << data->oversampling_humid;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
case IIO_PRESSURE:
|
|
*val = 1 << data->oversampling_press;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
case IIO_TEMP:
|
|
*val = 1 << data->oversampling_temp;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
break;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
if (!data->chip_info->sampling_freq_avail) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
*val = data->chip_info->sampling_freq_avail[data->sampling_freq][0];
|
|
*val2 = data->chip_info->sampling_freq_avail[data->sampling_freq][1];
|
|
ret = IIO_VAL_INT_PLUS_MICRO;
|
|
break;
|
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
|
|
if (!data->chip_info->iir_filter_coeffs_avail) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
*val = (1 << data->iir_filter_coeff) - 1;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bmp280_write_oversampling_ratio_humid(struct bmp280_data *data,
|
|
int val)
|
|
{
|
|
const int *avail = data->chip_info->oversampling_humid_avail;
|
|
const int n = data->chip_info->num_oversampling_humid_avail;
|
|
int ret, prev;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (avail[i] == val) {
|
|
prev = data->oversampling_humid;
|
|
data->oversampling_humid = ilog2(val);
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret) {
|
|
data->oversampling_humid = prev;
|
|
data->chip_info->chip_config(data);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
|
|
int val)
|
|
{
|
|
const int *avail = data->chip_info->oversampling_temp_avail;
|
|
const int n = data->chip_info->num_oversampling_temp_avail;
|
|
int ret, prev;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (avail[i] == val) {
|
|
prev = data->oversampling_temp;
|
|
data->oversampling_temp = ilog2(val);
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret) {
|
|
data->oversampling_temp = prev;
|
|
data->chip_info->chip_config(data);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
|
|
int val)
|
|
{
|
|
const int *avail = data->chip_info->oversampling_press_avail;
|
|
const int n = data->chip_info->num_oversampling_press_avail;
|
|
int ret, prev;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (avail[i] == val) {
|
|
prev = data->oversampling_press;
|
|
data->oversampling_press = ilog2(val);
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret) {
|
|
data->oversampling_press = prev;
|
|
data->chip_info->chip_config(data);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bmp280_write_sampling_frequency(struct bmp280_data *data,
|
|
int val, int val2)
|
|
{
|
|
const int (*avail)[2] = data->chip_info->sampling_freq_avail;
|
|
const int n = data->chip_info->num_sampling_freq_avail;
|
|
int ret, prev;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (avail[i][0] == val && avail[i][1] == val2) {
|
|
prev = data->sampling_freq;
|
|
data->sampling_freq = i;
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret) {
|
|
data->sampling_freq = prev;
|
|
data->chip_info->chip_config(data);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bmp280_write_iir_filter_coeffs(struct bmp280_data *data, int val)
|
|
{
|
|
const int *avail = data->chip_info->iir_filter_coeffs_avail;
|
|
const int n = data->chip_info->num_iir_filter_coeffs_avail;
|
|
int ret, prev;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
if (avail[i] - 1 == val) {
|
|
prev = data->iir_filter_coeff;
|
|
data->iir_filter_coeff = i;
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret) {
|
|
data->iir_filter_coeff = prev;
|
|
data->chip_info->chip_config(data);
|
|
return ret;
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int bmp280_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Helper functions to update sensor running configuration.
|
|
* If an error happens applying new settings, will try restore
|
|
* previous parameters to ensure the sensor is left in a known
|
|
* working configuration.
|
|
*/
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
switch (chan->type) {
|
|
case IIO_HUMIDITYRELATIVE:
|
|
ret = bmp280_write_oversampling_ratio_humid(data, val);
|
|
break;
|
|
case IIO_PRESSURE:
|
|
ret = bmp280_write_oversampling_ratio_press(data, val);
|
|
break;
|
|
case IIO_TEMP:
|
|
ret = bmp280_write_oversampling_ratio_temp(data, val);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
break;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
ret = bmp280_write_sampling_frequency(data, val, val2);
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
break;
|
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
ret = bmp280_write_iir_filter_coeffs(data, val);
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bmp280_read_avail(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
const int **vals, int *type, int *length,
|
|
long mask)
|
|
{
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
|
|
switch (chan->type) {
|
|
case IIO_PRESSURE:
|
|
*vals = data->chip_info->oversampling_press_avail;
|
|
*length = data->chip_info->num_oversampling_press_avail;
|
|
break;
|
|
case IIO_TEMP:
|
|
*vals = data->chip_info->oversampling_temp_avail;
|
|
*length = data->chip_info->num_oversampling_temp_avail;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
*type = IIO_VAL_INT;
|
|
return IIO_AVAIL_LIST;
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
*vals = (const int *)data->chip_info->sampling_freq_avail;
|
|
*type = IIO_VAL_INT_PLUS_MICRO;
|
|
/* Values are stored in a 2D matrix */
|
|
*length = data->chip_info->num_sampling_freq_avail;
|
|
return IIO_AVAIL_LIST;
|
|
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
|
|
*vals = data->chip_info->iir_filter_coeffs_avail;
|
|
*type = IIO_VAL_INT;
|
|
*length = data->chip_info->num_iir_filter_coeffs_avail;
|
|
return IIO_AVAIL_LIST;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct iio_info bmp280_info = {
|
|
.read_raw = &bmp280_read_raw,
|
|
.read_avail = &bmp280_read_avail,
|
|
.write_raw = &bmp280_write_raw,
|
|
};
|
|
|
|
static int bmp280_chip_config(struct bmp280_data *data)
|
|
{
|
|
u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |
|
|
FIELD_PREP(BMP280_OSRS_PRESS_MASK, data->oversampling_press + 1);
|
|
int ret;
|
|
|
|
ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS,
|
|
BMP280_OSRS_TEMP_MASK |
|
|
BMP280_OSRS_PRESS_MASK |
|
|
BMP280_MODE_MASK,
|
|
osrs | BMP280_MODE_NORMAL);
|
|
if (ret < 0) {
|
|
dev_err(data->dev,
|
|
"failed to write ctrl_meas register\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG,
|
|
BMP280_FILTER_MASK,
|
|
BMP280_FILTER_4X);
|
|
if (ret < 0) {
|
|
dev_err(data->dev,
|
|
"failed to write config register\n");
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
|
|
|
|
const struct bmp280_chip_info bmp280_chip_info = {
|
|
.id_reg = BMP280_REG_ID,
|
|
.chip_id = BMP280_CHIP_ID,
|
|
.regmap_config = &bmp280_regmap_config,
|
|
.start_up_time = 2000,
|
|
.channels = bmp280_channels,
|
|
.num_channels = 2,
|
|
|
|
.oversampling_temp_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
/*
|
|
* Oversampling config values on BMx280 have one additional setting
|
|
* that other generations of the family don't:
|
|
* The value 0 means the measurement is bypassed instead of
|
|
* oversampling set to x1.
|
|
*
|
|
* To account for this difference, and preserve the same common
|
|
* config logic, this is handled later on chip_config callback
|
|
* incrementing one unit the oversampling setting.
|
|
*/
|
|
.oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
|
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
.oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
|
|
|
|
.chip_config = bmp280_chip_config,
|
|
.read_temp = bmp280_read_temp,
|
|
.read_press = bmp280_read_press,
|
|
.read_calib = bmp280_read_calib,
|
|
};
|
|
EXPORT_SYMBOL_NS(bmp280_chip_info, IIO_BMP280);
|
|
|
|
static int bme280_chip_config(struct bmp280_data *data)
|
|
{
|
|
u8 osrs = FIELD_PREP(BMP280_OSRS_HUMIDITY_MASK, data->oversampling_humid + 1);
|
|
int ret;
|
|
|
|
/*
|
|
* Oversampling of humidity must be set before oversampling of
|
|
* temperature/pressure is set to become effective.
|
|
*/
|
|
ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_HUMIDITY,
|
|
BMP280_OSRS_HUMIDITY_MASK, osrs);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return bmp280_chip_config(data);
|
|
}
|
|
|
|
const struct bmp280_chip_info bme280_chip_info = {
|
|
.id_reg = BMP280_REG_ID,
|
|
.chip_id = BME280_CHIP_ID,
|
|
.regmap_config = &bmp280_regmap_config,
|
|
.start_up_time = 2000,
|
|
.channels = bmp280_channels,
|
|
.num_channels = 3,
|
|
|
|
.oversampling_temp_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
.oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
|
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
.oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
|
|
|
|
.oversampling_humid_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
.oversampling_humid_default = BMP280_OSRS_HUMIDITY_16X - 1,
|
|
|
|
.chip_config = bme280_chip_config,
|
|
.read_temp = bmp280_read_temp,
|
|
.read_press = bmp280_read_press,
|
|
.read_humid = bmp280_read_humid,
|
|
.read_calib = bme280_read_calib,
|
|
};
|
|
EXPORT_SYMBOL_NS(bme280_chip_info, IIO_BMP280);
|
|
|
|
/*
|
|
* Helper function to send a command to BMP3XX sensors.
|
|
*
|
|
* Sensor processes commands written to the CMD register and signals
|
|
* execution result through "cmd_rdy" and "cmd_error" flags available on
|
|
* STATUS and ERROR registers.
|
|
*/
|
|
static int bmp380_cmd(struct bmp280_data *data, u8 cmd)
|
|
{
|
|
unsigned int reg;
|
|
int ret;
|
|
|
|
/* Check if device is ready to process a command */
|
|
ret = regmap_read(data->regmap, BMP380_REG_STATUS, ®);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to read error register\n");
|
|
return ret;
|
|
}
|
|
if (!(reg & BMP380_STATUS_CMD_RDY_MASK)) {
|
|
dev_err(data->dev, "device is not ready to accept commands\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* Send command to process */
|
|
ret = regmap_write(data->regmap, BMP380_REG_CMD, cmd);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to send command to device\n");
|
|
return ret;
|
|
}
|
|
/* Wait for 2ms for command to be processed */
|
|
usleep_range(data->start_up_time, data->start_up_time + 100);
|
|
/* Check for command processing error */
|
|
ret = regmap_read(data->regmap, BMP380_REG_ERROR, ®);
|
|
if (ret) {
|
|
dev_err(data->dev, "error reading ERROR reg\n");
|
|
return ret;
|
|
}
|
|
if (reg & BMP380_ERR_CMD_MASK) {
|
|
dev_err(data->dev, "error processing command 0x%X\n", cmd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns temperature in Celsius dregrees, resolution is 0.01º C. Output value of
|
|
* "5123" equals 51.2º C. t_fine carries fine temperature as global value.
|
|
*
|
|
* Taken from datasheet, Section Appendix 9, "Compensation formula" and repo
|
|
* https://github.com/BoschSensortec/BMP3-Sensor-API.
|
|
*/
|
|
static s32 bmp380_compensate_temp(struct bmp280_data *data, u32 adc_temp)
|
|
{
|
|
s64 var1, var2, var3, var4, var5, var6, comp_temp;
|
|
struct bmp380_calib *calib = &data->calib.bmp380;
|
|
|
|
var1 = ((s64) adc_temp) - (((s64) calib->T1) << 8);
|
|
var2 = var1 * ((s64) calib->T2);
|
|
var3 = var1 * var1;
|
|
var4 = var3 * ((s64) calib->T3);
|
|
var5 = (var2 << 18) + var4;
|
|
var6 = var5 >> 32;
|
|
data->t_fine = (s32) var6;
|
|
comp_temp = (var6 * 25) >> 14;
|
|
|
|
comp_temp = clamp_val(comp_temp, BMP380_MIN_TEMP, BMP380_MAX_TEMP);
|
|
return (s32) comp_temp;
|
|
}
|
|
|
|
/*
|
|
* Returns pressure in Pa as an unsigned 32 bit integer in fractional Pascal.
|
|
* Output value of "9528709" represents 9528709/100 = 95287.09 Pa = 952.8709 hPa.
|
|
*
|
|
* Taken from datasheet, Section 9.3. "Pressure compensation" and repository
|
|
* https://github.com/BoschSensortec/BMP3-Sensor-API.
|
|
*/
|
|
static u32 bmp380_compensate_press(struct bmp280_data *data, u32 adc_press)
|
|
{
|
|
s64 var1, var2, var3, var4, var5, var6, offset, sensitivity;
|
|
struct bmp380_calib *calib = &data->calib.bmp380;
|
|
u32 comp_press;
|
|
|
|
var1 = (s64)data->t_fine * (s64)data->t_fine;
|
|
var2 = var1 >> 6;
|
|
var3 = (var2 * ((s64) data->t_fine)) >> 8;
|
|
var4 = ((s64)calib->P8 * var3) >> 5;
|
|
var5 = ((s64)calib->P7 * var1) << 4;
|
|
var6 = ((s64)calib->P6 * (s64)data->t_fine) << 22;
|
|
offset = ((s64)calib->P5 << 47) + var4 + var5 + var6;
|
|
var2 = ((s64)calib->P4 * var3) >> 5;
|
|
var4 = ((s64)calib->P3 * var1) << 2;
|
|
var5 = ((s64)calib->P2 - ((s64)1 << 14)) *
|
|
((s64)data->t_fine << 21);
|
|
sensitivity = (((s64) calib->P1 - ((s64) 1 << 14)) << 46) +
|
|
var2 + var4 + var5;
|
|
var1 = (sensitivity >> 24) * (s64)adc_press;
|
|
var2 = (s64)calib->P10 * (s64)data->t_fine;
|
|
var3 = var2 + ((s64)calib->P9 << 16);
|
|
var4 = (var3 * (s64)adc_press) >> 13;
|
|
|
|
/*
|
|
* Dividing by 10 followed by multiplying by 10 to avoid
|
|
* possible overflow caused by (uncomp_data->pressure * partial_data4).
|
|
*/
|
|
var5 = ((s64)adc_press * div_s64(var4, 10)) >> 9;
|
|
var5 *= 10;
|
|
var6 = (s64)adc_press * (s64)adc_press;
|
|
var2 = ((s64)calib->P11 * var6) >> 16;
|
|
var3 = (var2 * (s64)adc_press) >> 7;
|
|
var4 = (offset >> 2) + var1 + var5 + var3;
|
|
comp_press = ((u64)var4 * 25) >> 40;
|
|
|
|
comp_press = clamp_val(comp_press, BMP380_MIN_PRES, BMP380_MAX_PRES);
|
|
return comp_press;
|
|
}
|
|
|
|
static int bmp380_read_temp(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
s32 comp_temp;
|
|
u32 adc_temp;
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP380_REG_TEMP_XLSB,
|
|
data->buf, sizeof(data->buf));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to read temperature\n");
|
|
return ret;
|
|
}
|
|
|
|
adc_temp = get_unaligned_le24(data->buf);
|
|
if (adc_temp == BMP380_TEMP_SKIPPED) {
|
|
dev_err(data->dev, "reading temperature skipped\n");
|
|
return -EIO;
|
|
}
|
|
comp_temp = bmp380_compensate_temp(data, adc_temp);
|
|
|
|
/*
|
|
* Val might be NULL if we're called by the read_press routine,
|
|
* who only cares about the carry over t_fine value.
|
|
*/
|
|
if (val) {
|
|
/* IIO reports temperatures in milli Celsius */
|
|
*val = comp_temp * 10;
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp380_read_press(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
s32 comp_press;
|
|
u32 adc_press;
|
|
int ret;
|
|
|
|
/* Read and compensate for temperature so we get a reading of t_fine */
|
|
ret = bmp380_read_temp(data, NULL, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,
|
|
data->buf, sizeof(data->buf));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to read pressure\n");
|
|
return ret;
|
|
}
|
|
|
|
adc_press = get_unaligned_le24(data->buf);
|
|
if (adc_press == BMP380_PRESS_SKIPPED) {
|
|
dev_err(data->dev, "reading pressure skipped\n");
|
|
return -EIO;
|
|
}
|
|
comp_press = bmp380_compensate_press(data, adc_press);
|
|
|
|
*val = comp_press;
|
|
/* Compensated pressure is in cPa (centipascals) */
|
|
*val2 = 100000;
|
|
|
|
return IIO_VAL_FRACTIONAL;
|
|
}
|
|
|
|
static int bmp380_read_calib(struct bmp280_data *data)
|
|
{
|
|
struct bmp380_calib *calib = &data->calib.bmp380;
|
|
int ret;
|
|
|
|
/* Read temperature and pressure calibration data */
|
|
ret = regmap_bulk_read(data->regmap, BMP380_REG_CALIB_TEMP_START,
|
|
data->bmp380_cal_buf, sizeof(data->bmp380_cal_buf));
|
|
if (ret) {
|
|
dev_err(data->dev,
|
|
"failed to read temperature calibration parameters\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Toss the temperature calibration data into the entropy pool */
|
|
add_device_randomness(data->bmp380_cal_buf, sizeof(data->bmp380_cal_buf));
|
|
|
|
/* Parse calibration values */
|
|
calib->T1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T1]);
|
|
calib->T2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_T2]);
|
|
calib->T3 = data->bmp380_cal_buf[BMP380_T3];
|
|
calib->P1 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P1]);
|
|
calib->P2 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P2]);
|
|
calib->P3 = data->bmp380_cal_buf[BMP380_P3];
|
|
calib->P4 = data->bmp380_cal_buf[BMP380_P4];
|
|
calib->P5 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P5]);
|
|
calib->P6 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P6]);
|
|
calib->P7 = data->bmp380_cal_buf[BMP380_P7];
|
|
calib->P8 = data->bmp380_cal_buf[BMP380_P8];
|
|
calib->P9 = get_unaligned_le16(&data->bmp380_cal_buf[BMP380_P9]);
|
|
calib->P10 = data->bmp380_cal_buf[BMP380_P10];
|
|
calib->P11 = data->bmp380_cal_buf[BMP380_P11];
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const int bmp380_odr_table[][2] = {
|
|
[BMP380_ODR_200HZ] = {200, 0},
|
|
[BMP380_ODR_100HZ] = {100, 0},
|
|
[BMP380_ODR_50HZ] = {50, 0},
|
|
[BMP380_ODR_25HZ] = {25, 0},
|
|
[BMP380_ODR_12_5HZ] = {12, 500000},
|
|
[BMP380_ODR_6_25HZ] = {6, 250000},
|
|
[BMP380_ODR_3_125HZ] = {3, 125000},
|
|
[BMP380_ODR_1_5625HZ] = {1, 562500},
|
|
[BMP380_ODR_0_78HZ] = {0, 781250},
|
|
[BMP380_ODR_0_39HZ] = {0, 390625},
|
|
[BMP380_ODR_0_2HZ] = {0, 195313},
|
|
[BMP380_ODR_0_1HZ] = {0, 97656},
|
|
[BMP380_ODR_0_05HZ] = {0, 48828},
|
|
[BMP380_ODR_0_02HZ] = {0, 24414},
|
|
[BMP380_ODR_0_01HZ] = {0, 12207},
|
|
[BMP380_ODR_0_006HZ] = {0, 6104},
|
|
[BMP380_ODR_0_003HZ] = {0, 3052},
|
|
[BMP380_ODR_0_0015HZ] = {0, 1526},
|
|
};
|
|
|
|
static int bmp380_preinit(struct bmp280_data *data)
|
|
{
|
|
/* BMP3xx requires soft-reset as part of initialization */
|
|
return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
|
|
}
|
|
|
|
static int bmp380_chip_config(struct bmp280_data *data)
|
|
{
|
|
bool change = false, aux;
|
|
unsigned int tmp;
|
|
u8 osrs;
|
|
int ret;
|
|
|
|
/* Configure power control register */
|
|
ret = regmap_update_bits(data->regmap, BMP380_REG_POWER_CONTROL,
|
|
BMP380_CTRL_SENSORS_MASK,
|
|
BMP380_CTRL_SENSORS_PRESS_EN |
|
|
BMP380_CTRL_SENSORS_TEMP_EN);
|
|
if (ret) {
|
|
dev_err(data->dev,
|
|
"failed to write operation control register\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Configure oversampling */
|
|
osrs = FIELD_PREP(BMP380_OSRS_TEMP_MASK, data->oversampling_temp) |
|
|
FIELD_PREP(BMP380_OSRS_PRESS_MASK, data->oversampling_press);
|
|
|
|
ret = regmap_update_bits_check(data->regmap, BMP380_REG_OSR,
|
|
BMP380_OSRS_TEMP_MASK |
|
|
BMP380_OSRS_PRESS_MASK,
|
|
osrs, &aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write oversampling register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
/* Configure output data rate */
|
|
ret = regmap_update_bits_check(data->regmap, BMP380_REG_ODR,
|
|
BMP380_ODRS_MASK, data->sampling_freq, &aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write ODR selection register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
/* Set filter data */
|
|
ret = regmap_update_bits_check(data->regmap, BMP380_REG_CONFIG, BMP380_FILTER_MASK,
|
|
FIELD_PREP(BMP380_FILTER_MASK, data->iir_filter_coeff),
|
|
&aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write config register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
if (change) {
|
|
/*
|
|
* The configurations errors are detected on the fly during a measurement
|
|
* cycle. If the sampling frequency is too low, it's faster to reset
|
|
* the measurement loop than wait until the next measurement is due.
|
|
*
|
|
* Resets sensor measurement loop toggling between sleep and normal
|
|
* operating modes.
|
|
*/
|
|
ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,
|
|
BMP380_MODE_MASK,
|
|
FIELD_PREP(BMP380_MODE_MASK, BMP380_MODE_SLEEP));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to set sleep mode\n");
|
|
return ret;
|
|
}
|
|
usleep_range(2000, 2500);
|
|
ret = regmap_write_bits(data->regmap, BMP380_REG_POWER_CONTROL,
|
|
BMP380_MODE_MASK,
|
|
FIELD_PREP(BMP380_MODE_MASK, BMP380_MODE_NORMAL));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to set normal mode\n");
|
|
return ret;
|
|
}
|
|
/*
|
|
* Waits for measurement before checking configuration error flag.
|
|
* Selected longest measure time indicated in section 3.9.1
|
|
* in the datasheet.
|
|
*/
|
|
msleep(80);
|
|
|
|
/* Check config error flag */
|
|
ret = regmap_read(data->regmap, BMP380_REG_ERROR, &tmp);
|
|
if (ret) {
|
|
dev_err(data->dev,
|
|
"failed to read error register\n");
|
|
return ret;
|
|
}
|
|
if (tmp & BMP380_ERR_CONF_MASK) {
|
|
dev_warn(data->dev,
|
|
"sensor flagged configuration as incompatible\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };
|
|
static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};
|
|
|
|
const struct bmp280_chip_info bmp380_chip_info = {
|
|
.id_reg = BMP380_REG_ID,
|
|
.chip_id = BMP380_CHIP_ID,
|
|
.regmap_config = &bmp380_regmap_config,
|
|
.start_up_time = 2000,
|
|
.channels = bmp380_channels,
|
|
.num_channels = 2,
|
|
|
|
.oversampling_temp_avail = bmp380_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp380_oversampling_avail),
|
|
.oversampling_temp_default = ilog2(1),
|
|
|
|
.oversampling_press_avail = bmp380_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp380_oversampling_avail),
|
|
.oversampling_press_default = ilog2(4),
|
|
|
|
.sampling_freq_avail = bmp380_odr_table,
|
|
.num_sampling_freq_avail = ARRAY_SIZE(bmp380_odr_table) * 2,
|
|
.sampling_freq_default = BMP380_ODR_50HZ,
|
|
|
|
.iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
|
|
.num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
|
|
.iir_filter_coeff_default = 2,
|
|
|
|
.chip_config = bmp380_chip_config,
|
|
.read_temp = bmp380_read_temp,
|
|
.read_press = bmp380_read_press,
|
|
.read_calib = bmp380_read_calib,
|
|
.preinit = bmp380_preinit,
|
|
};
|
|
EXPORT_SYMBOL_NS(bmp380_chip_info, IIO_BMP280);
|
|
|
|
static int bmp580_soft_reset(struct bmp280_data *data)
|
|
{
|
|
unsigned int reg;
|
|
int ret;
|
|
|
|
ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_SOFT_RESET);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to send reset command to device\n");
|
|
return ret;
|
|
}
|
|
usleep_range(2000, 2500);
|
|
|
|
/* Dummy read of chip_id */
|
|
ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to reestablish comms after reset\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_read(data->regmap, BMP580_REG_INT_STATUS, ®);
|
|
if (ret) {
|
|
dev_err(data->dev, "error reading interrupt status register\n");
|
|
return ret;
|
|
}
|
|
if (!(reg & BMP580_INT_STATUS_POR_MASK)) {
|
|
dev_err(data->dev, "error resetting sensor\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* bmp580_nvm_operation() - Helper function to commit NVM memory operations
|
|
* @data: sensor data struct
|
|
* @is_write: flag to signal write operation
|
|
*/
|
|
static int bmp580_nvm_operation(struct bmp280_data *data, bool is_write)
|
|
{
|
|
unsigned long timeout, poll;
|
|
unsigned int reg;
|
|
int ret;
|
|
|
|
/* Check NVM ready flag */
|
|
ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to check nvm status\n");
|
|
return ret;
|
|
}
|
|
if (!(reg & BMP580_STATUS_NVM_RDY_MASK)) {
|
|
dev_err(data->dev, "sensor's nvm is not ready\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Start NVM operation sequence */
|
|
ret = regmap_write(data->regmap, BMP580_REG_CMD, BMP580_CMD_NVM_OP_SEQ_0);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to send nvm operation's first sequence\n");
|
|
return ret;
|
|
}
|
|
if (is_write) {
|
|
/* Send NVM write sequence */
|
|
ret = regmap_write(data->regmap, BMP580_REG_CMD,
|
|
BMP580_CMD_NVM_WRITE_SEQ_1);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to send nvm write sequence\n");
|
|
return ret;
|
|
}
|
|
/* Datasheet says on 4.8.1.2 it takes approximately 10ms */
|
|
poll = 2000;
|
|
timeout = 12000;
|
|
} else {
|
|
/* Send NVM read sequence */
|
|
ret = regmap_write(data->regmap, BMP580_REG_CMD,
|
|
BMP580_CMD_NVM_READ_SEQ_1);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to send nvm read sequence\n");
|
|
return ret;
|
|
}
|
|
/* Datasheet says on 4.8.1.1 it takes approximately 200us */
|
|
poll = 50;
|
|
timeout = 400;
|
|
}
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write command sequence\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Wait until NVM is ready again */
|
|
ret = regmap_read_poll_timeout(data->regmap, BMP580_REG_STATUS, reg,
|
|
(reg & BMP580_STATUS_NVM_RDY_MASK),
|
|
poll, timeout);
|
|
if (ret) {
|
|
dev_err(data->dev, "error checking nvm operation status\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Check NVM error flags */
|
|
if ((reg & BMP580_STATUS_NVM_ERR_MASK) || (reg & BMP580_STATUS_NVM_CMD_ERR_MASK)) {
|
|
dev_err(data->dev, "error processing nvm operation\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Contrary to previous sensors families, compensation algorithm is builtin.
|
|
* We are only required to read the register raw data and adapt the ranges
|
|
* for what is expected on IIO ABI.
|
|
*/
|
|
|
|
static int bmp580_read_temp(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
s32 raw_temp;
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB, data->buf,
|
|
sizeof(data->buf));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to read temperature\n");
|
|
return ret;
|
|
}
|
|
|
|
raw_temp = get_unaligned_le24(data->buf);
|
|
if (raw_temp == BMP580_TEMP_SKIPPED) {
|
|
dev_err(data->dev, "reading temperature skipped\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Temperature is returned in Celsius degrees in fractional
|
|
* form down 2^16. We reescale by x1000 to return milli Celsius
|
|
* to respect IIO ABI.
|
|
*/
|
|
*val = raw_temp * 1000;
|
|
*val2 = 16;
|
|
return IIO_VAL_FRACTIONAL_LOG2;
|
|
}
|
|
|
|
static int bmp580_read_press(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
u32 raw_press;
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB, data->buf,
|
|
sizeof(data->buf));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to read pressure\n");
|
|
return ret;
|
|
}
|
|
|
|
raw_press = get_unaligned_le24(data->buf);
|
|
if (raw_press == BMP580_PRESS_SKIPPED) {
|
|
dev_err(data->dev, "reading pressure skipped\n");
|
|
return -EIO;
|
|
}
|
|
/*
|
|
* Pressure is returned in Pascals in fractional form down 2^16.
|
|
* We reescale /1000 to convert to kilopascal to respect IIO ABI.
|
|
*/
|
|
*val = raw_press;
|
|
*val2 = 64000; /* 2^6 * 1000 */
|
|
return IIO_VAL_FRACTIONAL;
|
|
}
|
|
|
|
static const int bmp580_odr_table[][2] = {
|
|
[BMP580_ODR_240HZ] = {240, 0},
|
|
[BMP580_ODR_218HZ] = {218, 0},
|
|
[BMP580_ODR_199HZ] = {199, 0},
|
|
[BMP580_ODR_179HZ] = {179, 0},
|
|
[BMP580_ODR_160HZ] = {160, 0},
|
|
[BMP580_ODR_149HZ] = {149, 0},
|
|
[BMP580_ODR_140HZ] = {140, 0},
|
|
[BMP580_ODR_129HZ] = {129, 0},
|
|
[BMP580_ODR_120HZ] = {120, 0},
|
|
[BMP580_ODR_110HZ] = {110, 0},
|
|
[BMP580_ODR_100HZ] = {100, 0},
|
|
[BMP580_ODR_89HZ] = {89, 0},
|
|
[BMP580_ODR_80HZ] = {80, 0},
|
|
[BMP580_ODR_70HZ] = {70, 0},
|
|
[BMP580_ODR_60HZ] = {60, 0},
|
|
[BMP580_ODR_50HZ] = {50, 0},
|
|
[BMP580_ODR_45HZ] = {45, 0},
|
|
[BMP580_ODR_40HZ] = {40, 0},
|
|
[BMP580_ODR_35HZ] = {35, 0},
|
|
[BMP580_ODR_30HZ] = {30, 0},
|
|
[BMP580_ODR_25HZ] = {25, 0},
|
|
[BMP580_ODR_20HZ] = {20, 0},
|
|
[BMP580_ODR_15HZ] = {15, 0},
|
|
[BMP580_ODR_10HZ] = {10, 0},
|
|
[BMP580_ODR_5HZ] = {5, 0},
|
|
[BMP580_ODR_4HZ] = {4, 0},
|
|
[BMP580_ODR_3HZ] = {3, 0},
|
|
[BMP580_ODR_2HZ] = {2, 0},
|
|
[BMP580_ODR_1HZ] = {1, 0},
|
|
[BMP580_ODR_0_5HZ] = {0, 500000},
|
|
[BMP580_ODR_0_25HZ] = {0, 250000},
|
|
[BMP580_ODR_0_125HZ] = {0, 125000},
|
|
};
|
|
|
|
static const int bmp580_nvmem_addrs[] = { 0x20, 0x21, 0x22 };
|
|
|
|
static int bmp580_nvmem_read(void *priv, unsigned int offset, void *val,
|
|
size_t bytes)
|
|
{
|
|
struct bmp280_data *data = priv;
|
|
u16 *dst = val;
|
|
int ret, addr;
|
|
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
|
|
/* Set sensor in standby mode */
|
|
ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
|
|
BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
|
|
BMP580_ODR_DEEPSLEEP_DIS |
|
|
FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to change sensor to standby mode\n");
|
|
goto exit;
|
|
}
|
|
/* Wait standby transition time */
|
|
usleep_range(2500, 3000);
|
|
|
|
while (bytes >= sizeof(*dst)) {
|
|
addr = bmp580_nvmem_addrs[offset / sizeof(*dst)];
|
|
|
|
ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR,
|
|
FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
|
|
if (ret) {
|
|
dev_err(data->dev, "error writing nvm address\n");
|
|
goto exit;
|
|
}
|
|
|
|
ret = bmp580_nvm_operation(data, false);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP580_REG_NVM_DATA_LSB, &data->le16,
|
|
sizeof(data->le16));
|
|
if (ret) {
|
|
dev_err(data->dev, "error reading nvm data regs\n");
|
|
goto exit;
|
|
}
|
|
|
|
*dst++ = le16_to_cpu(data->le16);
|
|
bytes -= sizeof(*dst);
|
|
offset += sizeof(*dst);
|
|
}
|
|
exit:
|
|
/* Restore chip config */
|
|
data->chip_info->chip_config(data);
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
return ret;
|
|
}
|
|
|
|
static int bmp580_nvmem_write(void *priv, unsigned int offset, void *val,
|
|
size_t bytes)
|
|
{
|
|
struct bmp280_data *data = priv;
|
|
u16 *buf = val;
|
|
int ret, addr;
|
|
|
|
pm_runtime_get_sync(data->dev);
|
|
mutex_lock(&data->lock);
|
|
|
|
/* Set sensor in standby mode */
|
|
ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
|
|
BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
|
|
BMP580_ODR_DEEPSLEEP_DIS |
|
|
FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to change sensor to standby mode\n");
|
|
goto exit;
|
|
}
|
|
/* Wait standby transition time */
|
|
usleep_range(2500, 3000);
|
|
|
|
while (bytes >= sizeof(*buf)) {
|
|
addr = bmp580_nvmem_addrs[offset / sizeof(*buf)];
|
|
|
|
ret = regmap_write(data->regmap, BMP580_REG_NVM_ADDR, BMP580_NVM_PROG_EN |
|
|
FIELD_PREP(BMP580_NVM_ROW_ADDR_MASK, addr));
|
|
if (ret) {
|
|
dev_err(data->dev, "error writing nvm address\n");
|
|
goto exit;
|
|
}
|
|
data->le16 = cpu_to_le16(*buf++);
|
|
|
|
ret = regmap_bulk_write(data->regmap, BMP580_REG_NVM_DATA_LSB, &data->le16,
|
|
sizeof(data->le16));
|
|
if (ret) {
|
|
dev_err(data->dev, "error writing LSB NVM data regs\n");
|
|
goto exit;
|
|
}
|
|
|
|
ret = bmp580_nvm_operation(data, true);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
/* Disable programming mode bit */
|
|
ret = regmap_update_bits(data->regmap, BMP580_REG_NVM_ADDR,
|
|
BMP580_NVM_PROG_EN, 0);
|
|
if (ret) {
|
|
dev_err(data->dev, "error resetting nvm write\n");
|
|
goto exit;
|
|
}
|
|
|
|
bytes -= sizeof(*buf);
|
|
offset += sizeof(*buf);
|
|
}
|
|
exit:
|
|
/* Restore chip config */
|
|
data->chip_info->chip_config(data);
|
|
mutex_unlock(&data->lock);
|
|
pm_runtime_mark_last_busy(data->dev);
|
|
pm_runtime_put_autosuspend(data->dev);
|
|
return ret;
|
|
}
|
|
|
|
static int bmp580_preinit(struct bmp280_data *data)
|
|
{
|
|
struct nvmem_config config = {
|
|
.dev = data->dev,
|
|
.priv = data,
|
|
.name = "bmp580_nvmem",
|
|
.word_size = sizeof(u16),
|
|
.stride = sizeof(u16),
|
|
.size = 3 * sizeof(u16),
|
|
.reg_read = bmp580_nvmem_read,
|
|
.reg_write = bmp580_nvmem_write,
|
|
};
|
|
unsigned int reg;
|
|
int ret;
|
|
|
|
/* Issue soft-reset command */
|
|
ret = bmp580_soft_reset(data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Post powerup sequence */
|
|
ret = regmap_read(data->regmap, BMP580_REG_CHIP_ID, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Print warn message if we don't know the chip id */
|
|
if (reg != BMP580_CHIP_ID && reg != BMP580_CHIP_ID_ALT)
|
|
dev_warn(data->dev, "preinit: unexpected chip_id\n");
|
|
|
|
ret = regmap_read(data->regmap, BMP580_REG_STATUS, ®);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Check nvm status */
|
|
if (!(reg & BMP580_STATUS_NVM_RDY_MASK) || (reg & BMP580_STATUS_NVM_ERR_MASK)) {
|
|
dev_err(data->dev, "preinit: nvm error on powerup sequence\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Register nvmem device */
|
|
return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));
|
|
}
|
|
|
|
static int bmp580_chip_config(struct bmp280_data *data)
|
|
{
|
|
bool change = false, aux;
|
|
unsigned int tmp;
|
|
u8 reg_val;
|
|
int ret;
|
|
|
|
/* Sets sensor in standby mode */
|
|
ret = regmap_update_bits(data->regmap, BMP580_REG_ODR_CONFIG,
|
|
BMP580_MODE_MASK | BMP580_ODR_DEEPSLEEP_DIS,
|
|
BMP580_ODR_DEEPSLEEP_DIS |
|
|
FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_SLEEP));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to change sensor to standby mode\n");
|
|
return ret;
|
|
}
|
|
/* From datasheet's table 4: electrical characteristics */
|
|
usleep_range(2500, 3000);
|
|
|
|
/* Set default DSP mode settings */
|
|
reg_val = FIELD_PREP(BMP580_DSP_COMP_MASK, BMP580_DSP_PRESS_TEMP_COMP_EN) |
|
|
BMP580_DSP_SHDW_IIR_TEMP_EN | BMP580_DSP_SHDW_IIR_PRESS_EN;
|
|
|
|
ret = regmap_update_bits(data->regmap, BMP580_REG_DSP_CONFIG,
|
|
BMP580_DSP_COMP_MASK |
|
|
BMP580_DSP_SHDW_IIR_TEMP_EN |
|
|
BMP580_DSP_SHDW_IIR_PRESS_EN, reg_val);
|
|
|
|
/* Configure oversampling */
|
|
reg_val = FIELD_PREP(BMP580_OSR_TEMP_MASK, data->oversampling_temp) |
|
|
FIELD_PREP(BMP580_OSR_PRESS_MASK, data->oversampling_press) |
|
|
BMP580_OSR_PRESS_EN;
|
|
|
|
ret = regmap_update_bits_check(data->regmap, BMP580_REG_OSR_CONFIG,
|
|
BMP580_OSR_TEMP_MASK | BMP580_OSR_PRESS_MASK |
|
|
BMP580_OSR_PRESS_EN,
|
|
reg_val, &aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write oversampling register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
/* Configure output data rate */
|
|
ret = regmap_update_bits_check(data->regmap, BMP580_REG_ODR_CONFIG, BMP580_ODR_MASK,
|
|
FIELD_PREP(BMP580_ODR_MASK, data->sampling_freq),
|
|
&aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write ODR configuration register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
/* Set filter data */
|
|
reg_val = FIELD_PREP(BMP580_DSP_IIR_PRESS_MASK, data->iir_filter_coeff) |
|
|
FIELD_PREP(BMP580_DSP_IIR_TEMP_MASK, data->iir_filter_coeff);
|
|
|
|
ret = regmap_update_bits_check(data->regmap, BMP580_REG_DSP_IIR,
|
|
BMP580_DSP_IIR_PRESS_MASK |
|
|
BMP580_DSP_IIR_TEMP_MASK,
|
|
reg_val, &aux);
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to write config register\n");
|
|
return ret;
|
|
}
|
|
change = change || aux;
|
|
|
|
/* Restore sensor to normal operation mode */
|
|
ret = regmap_write_bits(data->regmap, BMP580_REG_ODR_CONFIG,
|
|
BMP580_MODE_MASK,
|
|
FIELD_PREP(BMP580_MODE_MASK, BMP580_MODE_NORMAL));
|
|
if (ret) {
|
|
dev_err(data->dev, "failed to set normal mode\n");
|
|
return ret;
|
|
}
|
|
/* From datasheet's table 4: electrical characteristics */
|
|
usleep_range(3000, 3500);
|
|
|
|
if (change) {
|
|
/*
|
|
* Check if ODR and OSR settings are valid or we are
|
|
* operating in a degraded mode.
|
|
*/
|
|
ret = regmap_read(data->regmap, BMP580_REG_EFF_OSR, &tmp);
|
|
if (ret) {
|
|
dev_err(data->dev, "error reading effective OSR register\n");
|
|
return ret;
|
|
}
|
|
if (!(tmp & BMP580_EFF_OSR_VALID_ODR)) {
|
|
dev_warn(data->dev, "OSR and ODR incompatible settings detected\n");
|
|
/* Set current OSR settings from data on effective OSR */
|
|
data->oversampling_temp = FIELD_GET(BMP580_EFF_OSR_TEMP_MASK, tmp);
|
|
data->oversampling_press = FIELD_GET(BMP580_EFF_OSR_PRESS_MASK, tmp);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
|
|
|
|
const struct bmp280_chip_info bmp580_chip_info = {
|
|
.id_reg = BMP580_REG_CHIP_ID,
|
|
.chip_id = BMP580_CHIP_ID,
|
|
.regmap_config = &bmp580_regmap_config,
|
|
.start_up_time = 2000,
|
|
.channels = bmp380_channels,
|
|
.num_channels = 2,
|
|
|
|
.oversampling_temp_avail = bmp580_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp580_oversampling_avail),
|
|
.oversampling_temp_default = ilog2(1),
|
|
|
|
.oversampling_press_avail = bmp580_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp580_oversampling_avail),
|
|
.oversampling_press_default = ilog2(4),
|
|
|
|
.sampling_freq_avail = bmp580_odr_table,
|
|
.num_sampling_freq_avail = ARRAY_SIZE(bmp580_odr_table) * 2,
|
|
.sampling_freq_default = BMP580_ODR_50HZ,
|
|
|
|
.iir_filter_coeffs_avail = bmp380_iir_filter_coeffs_avail,
|
|
.num_iir_filter_coeffs_avail = ARRAY_SIZE(bmp380_iir_filter_coeffs_avail),
|
|
.iir_filter_coeff_default = 2,
|
|
|
|
.chip_config = bmp580_chip_config,
|
|
.read_temp = bmp580_read_temp,
|
|
.read_press = bmp580_read_press,
|
|
.preinit = bmp580_preinit,
|
|
};
|
|
EXPORT_SYMBOL_NS(bmp580_chip_info, IIO_BMP280);
|
|
|
|
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
|
|
{
|
|
const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };
|
|
unsigned int delay_us;
|
|
unsigned int ctrl;
|
|
int ret;
|
|
|
|
if (data->use_eoc)
|
|
reinit_completion(&data->done);
|
|
|
|
ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (data->use_eoc) {
|
|
/*
|
|
* If we have a completion interrupt, use it, wait up to
|
|
* 100ms. The longest conversion time listed is 76.5 ms for
|
|
* advanced resolution mode.
|
|
*/
|
|
ret = wait_for_completion_timeout(&data->done,
|
|
1 + msecs_to_jiffies(100));
|
|
if (!ret)
|
|
dev_err(data->dev, "timeout waiting for completion\n");
|
|
} else {
|
|
if (FIELD_GET(BMP180_MEAS_CTRL_MASK, ctrl_meas) == BMP180_MEAS_TEMP)
|
|
delay_us = 4500;
|
|
else
|
|
delay_us =
|
|
conversion_time_max[data->oversampling_press];
|
|
|
|
usleep_range(delay_us, delay_us + 1000);
|
|
}
|
|
|
|
ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* The value of this bit reset to "0" after conversion is complete */
|
|
if (ctrl & BMP180_MEAS_SCO)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp180_read_adc_temp(struct bmp280_data *data, int *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = bmp180_measure(data,
|
|
FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_TEMP) |
|
|
BMP180_MEAS_SCO);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,
|
|
&data->be16, sizeof(data->be16));
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = be16_to_cpu(data->be16);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp180_read_calib(struct bmp280_data *data)
|
|
{
|
|
struct bmp180_calib *calib = &data->calib.bmp180;
|
|
int ret;
|
|
int i;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START,
|
|
data->bmp180_cal_buf, sizeof(data->bmp180_cal_buf));
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* None of the words has the value 0 or 0xFFFF */
|
|
for (i = 0; i < ARRAY_SIZE(data->bmp180_cal_buf); i++) {
|
|
if (data->bmp180_cal_buf[i] == cpu_to_be16(0) ||
|
|
data->bmp180_cal_buf[i] == cpu_to_be16(0xffff))
|
|
return -EIO;
|
|
}
|
|
|
|
/* Toss the calibration data into the entropy pool */
|
|
add_device_randomness(data->bmp180_cal_buf, sizeof(data->bmp180_cal_buf));
|
|
|
|
calib->AC1 = be16_to_cpu(data->bmp180_cal_buf[AC1]);
|
|
calib->AC2 = be16_to_cpu(data->bmp180_cal_buf[AC2]);
|
|
calib->AC3 = be16_to_cpu(data->bmp180_cal_buf[AC3]);
|
|
calib->AC4 = be16_to_cpu(data->bmp180_cal_buf[AC4]);
|
|
calib->AC5 = be16_to_cpu(data->bmp180_cal_buf[AC5]);
|
|
calib->AC6 = be16_to_cpu(data->bmp180_cal_buf[AC6]);
|
|
calib->B1 = be16_to_cpu(data->bmp180_cal_buf[B1]);
|
|
calib->B2 = be16_to_cpu(data->bmp180_cal_buf[B2]);
|
|
calib->MB = be16_to_cpu(data->bmp180_cal_buf[MB]);
|
|
calib->MC = be16_to_cpu(data->bmp180_cal_buf[MC]);
|
|
calib->MD = be16_to_cpu(data->bmp180_cal_buf[MD]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns temperature in DegC, resolution is 0.1 DegC.
|
|
* t_fine carries fine temperature as global value.
|
|
*
|
|
* Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
|
|
*/
|
|
static s32 bmp180_compensate_temp(struct bmp280_data *data, s32 adc_temp)
|
|
{
|
|
struct bmp180_calib *calib = &data->calib.bmp180;
|
|
s32 x1, x2;
|
|
|
|
x1 = ((adc_temp - calib->AC6) * calib->AC5) >> 15;
|
|
x2 = (calib->MC << 11) / (x1 + calib->MD);
|
|
data->t_fine = x1 + x2;
|
|
|
|
return (data->t_fine + 8) >> 4;
|
|
}
|
|
|
|
static int bmp180_read_temp(struct bmp280_data *data, int *val, int *val2)
|
|
{
|
|
s32 adc_temp, comp_temp;
|
|
int ret;
|
|
|
|
ret = bmp180_read_adc_temp(data, &adc_temp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
comp_temp = bmp180_compensate_temp(data, adc_temp);
|
|
|
|
/*
|
|
* val might be NULL if we're called by the read_press routine,
|
|
* who only cares about the carry over t_fine value.
|
|
*/
|
|
if (val) {
|
|
*val = comp_temp * 100;
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp180_read_adc_press(struct bmp280_data *data, int *val)
|
|
{
|
|
u8 oss = data->oversampling_press;
|
|
int ret;
|
|
|
|
ret = bmp180_measure(data,
|
|
FIELD_PREP(BMP180_MEAS_CTRL_MASK, BMP180_MEAS_PRESS) |
|
|
FIELD_PREP(BMP180_OSRS_PRESS_MASK, oss) |
|
|
BMP180_MEAS_SCO);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,
|
|
data->buf, sizeof(data->buf));
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = get_unaligned_be24(data->buf) >> (8 - oss);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns pressure in Pa, resolution is 1 Pa.
|
|
*
|
|
* Taken from datasheet, Section 3.5, "Calculating pressure and temperature".
|
|
*/
|
|
static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press)
|
|
{
|
|
struct bmp180_calib *calib = &data->calib.bmp180;
|
|
s32 oss = data->oversampling_press;
|
|
s32 x1, x2, x3, p;
|
|
s32 b3, b6;
|
|
u32 b4, b7;
|
|
|
|
b6 = data->t_fine - 4000;
|
|
x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11;
|
|
x2 = calib->AC2 * b6 >> 11;
|
|
x3 = x1 + x2;
|
|
b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4;
|
|
x1 = calib->AC3 * b6 >> 13;
|
|
x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16;
|
|
x3 = (x1 + x2 + 2) >> 2;
|
|
b4 = calib->AC4 * (u32)(x3 + 32768) >> 15;
|
|
b7 = ((u32)adc_press - b3) * (50000 >> oss);
|
|
if (b7 < 0x80000000)
|
|
p = (b7 * 2) / b4;
|
|
else
|
|
p = (b7 / b4) * 2;
|
|
|
|
x1 = (p >> 8) * (p >> 8);
|
|
x1 = (x1 * 3038) >> 16;
|
|
x2 = (-7357 * p) >> 16;
|
|
|
|
return p + ((x1 + x2 + 3791) >> 4);
|
|
}
|
|
|
|
static int bmp180_read_press(struct bmp280_data *data,
|
|
int *val, int *val2)
|
|
{
|
|
u32 comp_press;
|
|
s32 adc_press;
|
|
int ret;
|
|
|
|
/* Read and compensate temperature so we get a reading of t_fine. */
|
|
ret = bmp180_read_temp(data, NULL, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = bmp180_read_adc_press(data, &adc_press);
|
|
if (ret)
|
|
return ret;
|
|
|
|
comp_press = bmp180_compensate_press(data, adc_press);
|
|
|
|
*val = comp_press;
|
|
*val2 = 1000;
|
|
|
|
return IIO_VAL_FRACTIONAL;
|
|
}
|
|
|
|
static int bmp180_chip_config(struct bmp280_data *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const int bmp180_oversampling_temp_avail[] = { 1 };
|
|
static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
|
|
|
|
const struct bmp280_chip_info bmp180_chip_info = {
|
|
.id_reg = BMP280_REG_ID,
|
|
.chip_id = BMP180_CHIP_ID,
|
|
.regmap_config = &bmp180_regmap_config,
|
|
.start_up_time = 2000,
|
|
.channels = bmp280_channels,
|
|
.num_channels = 2,
|
|
|
|
.oversampling_temp_avail = bmp180_oversampling_temp_avail,
|
|
.num_oversampling_temp_avail =
|
|
ARRAY_SIZE(bmp180_oversampling_temp_avail),
|
|
.oversampling_temp_default = 0,
|
|
|
|
.oversampling_press_avail = bmp180_oversampling_press_avail,
|
|
.num_oversampling_press_avail =
|
|
ARRAY_SIZE(bmp180_oversampling_press_avail),
|
|
.oversampling_press_default = BMP180_MEAS_PRESS_8X,
|
|
|
|
.chip_config = bmp180_chip_config,
|
|
.read_temp = bmp180_read_temp,
|
|
.read_press = bmp180_read_press,
|
|
.read_calib = bmp180_read_calib,
|
|
};
|
|
EXPORT_SYMBOL_NS(bmp180_chip_info, IIO_BMP280);
|
|
|
|
static irqreturn_t bmp085_eoc_irq(int irq, void *d)
|
|
{
|
|
struct bmp280_data *data = d;
|
|
|
|
complete(&data->done);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int bmp085_fetch_eoc_irq(struct device *dev,
|
|
const char *name,
|
|
int irq,
|
|
struct bmp280_data *data)
|
|
{
|
|
unsigned long irq_trig;
|
|
int ret;
|
|
|
|
irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
|
|
if (irq_trig != IRQF_TRIGGER_RISING) {
|
|
dev_err(dev, "non-rising trigger given for EOC interrupt, trying to enforce it\n");
|
|
irq_trig = IRQF_TRIGGER_RISING;
|
|
}
|
|
|
|
init_completion(&data->done);
|
|
|
|
ret = devm_request_threaded_irq(dev,
|
|
irq,
|
|
bmp085_eoc_irq,
|
|
NULL,
|
|
irq_trig,
|
|
name,
|
|
data);
|
|
if (ret) {
|
|
/* Bail out without IRQ but keep the driver in place */
|
|
dev_err(dev, "unable to request DRDY IRQ\n");
|
|
return 0;
|
|
}
|
|
|
|
data->use_eoc = true;
|
|
return 0;
|
|
}
|
|
|
|
static void bmp280_pm_disable(void *data)
|
|
{
|
|
struct device *dev = data;
|
|
|
|
pm_runtime_get_sync(dev);
|
|
pm_runtime_put_noidle(dev);
|
|
pm_runtime_disable(dev);
|
|
}
|
|
|
|
static void bmp280_regulators_disable(void *data)
|
|
{
|
|
struct regulator_bulk_data *supplies = data;
|
|
|
|
regulator_bulk_disable(BMP280_NUM_SUPPLIES, supplies);
|
|
}
|
|
|
|
int bmp280_common_probe(struct device *dev,
|
|
struct regmap *regmap,
|
|
const struct bmp280_chip_info *chip_info,
|
|
const char *name,
|
|
int irq)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct bmp280_data *data;
|
|
struct gpio_desc *gpiod;
|
|
unsigned int chip_id;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
mutex_init(&data->lock);
|
|
data->dev = dev;
|
|
|
|
indio_dev->name = name;
|
|
indio_dev->info = &bmp280_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
data->chip_info = chip_info;
|
|
|
|
/* Apply initial values from chip info structure */
|
|
indio_dev->channels = chip_info->channels;
|
|
indio_dev->num_channels = chip_info->num_channels;
|
|
data->oversampling_press = chip_info->oversampling_press_default;
|
|
data->oversampling_humid = chip_info->oversampling_humid_default;
|
|
data->oversampling_temp = chip_info->oversampling_temp_default;
|
|
data->iir_filter_coeff = chip_info->iir_filter_coeff_default;
|
|
data->sampling_freq = chip_info->sampling_freq_default;
|
|
data->start_up_time = chip_info->start_up_time;
|
|
|
|
/* Bring up regulators */
|
|
regulator_bulk_set_supply_names(data->supplies,
|
|
bmp280_supply_names,
|
|
BMP280_NUM_SUPPLIES);
|
|
|
|
ret = devm_regulator_bulk_get(dev,
|
|
BMP280_NUM_SUPPLIES, data->supplies);
|
|
if (ret) {
|
|
dev_err(dev, "failed to get regulators\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable regulators\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(dev, bmp280_regulators_disable,
|
|
data->supplies);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Wait to make sure we started up properly */
|
|
usleep_range(data->start_up_time, data->start_up_time + 100);
|
|
|
|
/* Bring chip out of reset if there is an assigned GPIO line */
|
|
gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
|
|
/* Deassert the signal */
|
|
if (gpiod) {
|
|
dev_info(dev, "release reset\n");
|
|
gpiod_set_value(gpiod, 0);
|
|
}
|
|
|
|
data->regmap = regmap;
|
|
|
|
ret = regmap_read(regmap, data->chip_info->id_reg, &chip_id);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (chip_id != data->chip_info->chip_id) {
|
|
dev_err(dev, "bad chip id: expected %x got %x\n",
|
|
data->chip_info->chip_id, chip_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (data->chip_info->preinit) {
|
|
ret = data->chip_info->preinit(data);
|
|
if (ret)
|
|
return dev_err_probe(data->dev, ret,
|
|
"error running preinit tasks\n");
|
|
}
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_set_drvdata(dev, indio_dev);
|
|
|
|
/*
|
|
* Some chips have calibration parameters "programmed into the devices'
|
|
* non-volatile memory during production". Let's read them out at probe
|
|
* time once. They will not change.
|
|
*/
|
|
|
|
if (data->chip_info->read_calib) {
|
|
ret = data->chip_info->read_calib(data);
|
|
if (ret < 0)
|
|
return dev_err_probe(data->dev, ret,
|
|
"failed to read calibration coefficients\n");
|
|
}
|
|
|
|
/*
|
|
* Attempt to grab an optional EOC IRQ - only the BMP085 has this
|
|
* however as it happens, the BMP085 shares the chip ID of BMP180
|
|
* so we look for an IRQ if we have that.
|
|
*/
|
|
if (irq > 0 && (chip_id == BMP180_CHIP_ID)) {
|
|
ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
/* Enable runtime PM */
|
|
pm_runtime_get_noresume(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
/*
|
|
* Set autosuspend to two orders of magnitude larger than the
|
|
* start-up time.
|
|
*/
|
|
pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10);
|
|
pm_runtime_use_autosuspend(dev);
|
|
pm_runtime_put(dev);
|
|
|
|
ret = devm_add_action_or_reset(dev, bmp280_pm_disable, dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_iio_device_register(dev, indio_dev);
|
|
}
|
|
EXPORT_SYMBOL_NS(bmp280_common_probe, IIO_BMP280);
|
|
|
|
static int bmp280_runtime_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
|
|
return regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies);
|
|
}
|
|
|
|
static int bmp280_runtime_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies);
|
|
if (ret)
|
|
return ret;
|
|
usleep_range(data->start_up_time, data->start_up_time + 100);
|
|
return data->chip_info->chip_config(data);
|
|
}
|
|
|
|
EXPORT_RUNTIME_DEV_PM_OPS(bmp280_dev_pm_ops, bmp280_runtime_suspend,
|
|
bmp280_runtime_resume, NULL);
|
|
|
|
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
|
MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
|
|
MODULE_LICENSE("GPL v2");
|